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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /******************************************************************************
   3  *
   4  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
   5  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
   6  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
   7  * Copyright(c) 2018 - 2019 Intel Corporation
   8  *
   9  * Contact Information:
  10  *  Intel Linux Wireless <linuxwifi@intel.com>
  11  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  12  *
  13  *****************************************************************************/
  14 #include <linux/kernel.h>
  15 #include <linux/skbuff.h>
  16 #include <linux/slab.h>
  17 #include <net/mac80211.h>
  18
  19 #include <linux/netdevice.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/delay.h>
  22
  23 #include <linux/workqueue.h>
  24 #include "rs.h"
  25 #include "fw-api.h"
  26 #include "sta.h"
  27 #include "iwl-op-mode.h"
  28 #include "mvm.h"
  29 #include "debugfs.h"
  30
  31 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  32
  33 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
  34  * Use this macro when dealing with thresholds consts set as a percentage
  35  */
  36 #define RS_PERCENT(x) (128 * x)
  37
  38 static u8 rs_ht_to_legacy[] = {
  39         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  40         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  41         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  42         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  43         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  44         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  45         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  46         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  47         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  48         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  49 };
  50
  51 static const u8 ant_toggle_lookup[] = {
  52         [ANT_NONE] = ANT_NONE,
  53         [ANT_A] = ANT_B,
  54         [ANT_B] = ANT_A,
  55         [ANT_AB] = ANT_AB,
  56 };
  57
  58 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  59         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  60                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  61                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  62                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  63                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  64                                     IWL_RATE_##rp##M_INDEX,           \
  65                                     IWL_RATE_##rn##M_INDEX }
  66
  67 #define IWL_DECLARE_MCS_RATE(s)                                           \
  68         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
  69                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
  70                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
  71                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
  72                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
  73                                        IWL_RATE_INVM_INDEX,               \
  74                                        IWL_RATE_INVM_INDEX }
  75
  76 /*
  77  * Parameter order:
  78  *   rate, ht rate, prev rate, next rate
  79  *
  80  * If there isn't a valid next or previous rate then INV is used which
  81  * maps to IWL_RATE_INVALID
  82  *
  83  */
  84 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
  85         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
  86         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
  87         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
  88         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
  89         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
  90         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
  91         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
  92         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
  93         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
  94         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
  95         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
  96         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
  97         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
  98         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
  99         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 100 };
 101
 102 enum rs_action {
 103         RS_ACTION_STAY = 0,
 104         RS_ACTION_DOWNSCALE = -1,
 105         RS_ACTION_UPSCALE = 1,
 106 };
 107
 108 enum rs_column_mode {
 109         RS_INVALID = 0,
 110         RS_LEGACY,
 111         RS_SISO,
 112         RS_MIMO2,
 113 };
 114
 115 #define MAX_NEXT_COLUMNS 7
 116 #define MAX_COLUMN_CHECKS 3
 117
 118 struct rs_tx_column;
 119
 120 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 121                                      struct ieee80211_sta *sta,
 122                                      struct rs_rate *rate,
 123                                      const struct rs_tx_column *next_col);
 124
 125 struct rs_tx_column {
 126         enum rs_column_mode mode;
 127         u8 ant;
 128         bool sgi;
 129         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 130         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 131 };
 132
 133 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 134                          struct rs_rate *rate,
 135                          const struct rs_tx_column *next_col)
 136 {
 137         return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
 138 }
 139
 140 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 141                           struct rs_rate *rate,
 142                           const struct rs_tx_column *next_col)
 143 {
 144         if (!sta->ht_cap.ht_supported)
 145                 return false;
 146
 147         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 148                 return false;
 149
 150         if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
 151                 return false;
 152
 153         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 154                 return false;
 155
 156         if (mvm->nvm_data->sku_cap_mimo_disabled)
 157                 return false;
 158
 159         return true;
 160 }
 161
 162 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 163                           struct rs_rate *rate,
 164                           const struct rs_tx_column *next_col)
 165 {
 166         if (!sta->ht_cap.ht_supported)
 167                 return false;
 168
 169         return true;
 170 }
 171
 172 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 173                          struct rs_rate *rate,
 174                          const struct rs_tx_column *next_col)
 175 {
 176         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 177         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 178
 179         if (is_ht20(rate) && (ht_cap->cap &
 180                              IEEE80211_HT_CAP_SGI_20))
 181                 return true;
 182         if (is_ht40(rate) && (ht_cap->cap &
 183                              IEEE80211_HT_CAP_SGI_40))
 184                 return true;
 185         if (is_ht80(rate) && (vht_cap->cap &
 186                              IEEE80211_VHT_CAP_SHORT_GI_80))
 187                 return true;
 188         if (is_ht160(rate) && (vht_cap->cap &
 189                              IEEE80211_VHT_CAP_SHORT_GI_160))
 190                 return true;
 191
 192         return false;
 193 }
 194
 195 static const struct rs_tx_column rs_tx_columns[] = {
 196         [RS_COLUMN_LEGACY_ANT_A] = {
 197                 .mode = RS_LEGACY,
 198                 .ant = ANT_A,
 199                 .next_columns = {
 200                         RS_COLUMN_LEGACY_ANT_B,
 201                         RS_COLUMN_SISO_ANT_A,
 202                         RS_COLUMN_MIMO2,
 203                         RS_COLUMN_INVALID,
 204                         RS_COLUMN_INVALID,
 205                         RS_COLUMN_INVALID,
 206                         RS_COLUMN_INVALID,
 207                 },
 208                 .checks = {
 209                         rs_ant_allow,
 210                 },
 211         },
 212         [RS_COLUMN_LEGACY_ANT_B] = {
 213                 .mode = RS_LEGACY,
 214                 .ant = ANT_B,
 215                 .next_columns = {
 216                         RS_COLUMN_LEGACY_ANT_A,
 217                         RS_COLUMN_SISO_ANT_B,
 218                         RS_COLUMN_MIMO2,
 219                         RS_COLUMN_INVALID,
 220                         RS_COLUMN_INVALID,
 221                         RS_COLUMN_INVALID,
 222                         RS_COLUMN_INVALID,
 223                 },
 224                 .checks = {
 225                         rs_ant_allow,
 226                 },
 227         },
 228         [RS_COLUMN_SISO_ANT_A] = {
 229                 .mode = RS_SISO,
 230                 .ant = ANT_A,
 231                 .next_columns = {
 232                         RS_COLUMN_SISO_ANT_B,
 233                         RS_COLUMN_MIMO2,
 234                         RS_COLUMN_SISO_ANT_A_SGI,
 235                         RS_COLUMN_LEGACY_ANT_A,
 236                         RS_COLUMN_LEGACY_ANT_B,
 237                         RS_COLUMN_INVALID,
 238                         RS_COLUMN_INVALID,
 239                 },
 240                 .checks = {
 241                         rs_siso_allow,
 242                         rs_ant_allow,
 243                 },
 244         },
 245         [RS_COLUMN_SISO_ANT_B] = {
 246                 .mode = RS_SISO,
 247                 .ant = ANT_B,
 248                 .next_columns = {
 249                         RS_COLUMN_SISO_ANT_A,
 250                         RS_COLUMN_MIMO2,
 251                         RS_COLUMN_SISO_ANT_B_SGI,
 252                         RS_COLUMN_LEGACY_ANT_A,
 253                         RS_COLUMN_LEGACY_ANT_B,
 254                         RS_COLUMN_INVALID,
 255                         RS_COLUMN_INVALID,
 256                 },
 257                 .checks = {
 258                         rs_siso_allow,
 259                         rs_ant_allow,
 260                 },
 261         },
 262         [RS_COLUMN_SISO_ANT_A_SGI] = {
 263                 .mode = RS_SISO,
 264                 .ant = ANT_A,
 265                 .sgi = true,
 266                 .next_columns = {
 267                         RS_COLUMN_SISO_ANT_B_SGI,
 268                         RS_COLUMN_MIMO2_SGI,
 269                         RS_COLUMN_SISO_ANT_A,
 270                         RS_COLUMN_LEGACY_ANT_A,
 271                         RS_COLUMN_LEGACY_ANT_B,
 272                         RS_COLUMN_INVALID,
 273                         RS_COLUMN_INVALID,
 274                 },
 275                 .checks = {
 276                         rs_siso_allow,
 277                         rs_ant_allow,
 278                         rs_sgi_allow,
 279                 },
 280         },
 281         [RS_COLUMN_SISO_ANT_B_SGI] = {
 282                 .mode = RS_SISO,
 283                 .ant = ANT_B,
 284                 .sgi = true,
 285                 .next_columns = {
 286                         RS_COLUMN_SISO_ANT_A_SGI,
 287                         RS_COLUMN_MIMO2_SGI,
 288                         RS_COLUMN_SISO_ANT_B,
 289                         RS_COLUMN_LEGACY_ANT_A,
 290                         RS_COLUMN_LEGACY_ANT_B,
 291                         RS_COLUMN_INVALID,
 292                         RS_COLUMN_INVALID,
 293                 },
 294                 .checks = {
 295                         rs_siso_allow,
 296                         rs_ant_allow,
 297                         rs_sgi_allow,
 298                 },
 299         },
 300         [RS_COLUMN_MIMO2] = {
 301                 .mode = RS_MIMO2,
 302                 .ant = ANT_AB,
 303                 .next_columns = {
 304                         RS_COLUMN_SISO_ANT_A,
 305                         RS_COLUMN_MIMO2_SGI,
 306                         RS_COLUMN_LEGACY_ANT_A,
 307                         RS_COLUMN_LEGACY_ANT_B,
 308                         RS_COLUMN_INVALID,
 309                         RS_COLUMN_INVALID,
 310                         RS_COLUMN_INVALID,
 311                 },
 312                 .checks = {
 313                         rs_mimo_allow,
 314                 },
 315         },
 316         [RS_COLUMN_MIMO2_SGI] = {
 317                 .mode = RS_MIMO2,
 318                 .ant = ANT_AB,
 319                 .sgi = true,
 320                 .next_columns = {
 321                         RS_COLUMN_SISO_ANT_A_SGI,
 322                         RS_COLUMN_MIMO2,
 323                         RS_COLUMN_LEGACY_ANT_A,
 324                         RS_COLUMN_LEGACY_ANT_B,
 325                         RS_COLUMN_INVALID,
 326                         RS_COLUMN_INVALID,
 327                         RS_COLUMN_INVALID,
 328                 },
 329                 .checks = {
 330                         rs_mimo_allow,
 331                         rs_sgi_allow,
 332                 },
 333         },
 334 };
 335
 336 static inline u8 rs_extract_rate(u32 rate_n_flags)
 337 {
 338         /* also works for HT because bits 7:6 are zero there */
 339         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 340 }
 341
 342 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 343 {
 344         int idx = 0;
 345
 346         if (rate_n_flags & RATE_MCS_HT_MSK) {
 347                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 348                 idx += IWL_RATE_MCS_0_INDEX;
 349
 350                 /* skip 9M not supported in HT*/
 351                 if (idx >= IWL_RATE_9M_INDEX)
 352                         idx += 1;
 353                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 354                         return idx;
 355         } else if (rate_n_flags & RATE_MCS_VHT_MSK ||
 356                    rate_n_flags & RATE_MCS_HE_MSK) {
 357                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 358                 idx += IWL_RATE_MCS_0_INDEX;
 359
 360                 /* skip 9M not supported in VHT*/
 361                 if (idx >= IWL_RATE_9M_INDEX)
 362                         idx++;
 363                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 364                         return idx;
 365                 if ((rate_n_flags & RATE_MCS_HE_MSK) &&
 366                     (idx <= IWL_LAST_HE_RATE))
 367                         return idx;
 368         } else {
 369                 /* legacy rate format, search for match in table */
 370
 371                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 372                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 373                         if (iwl_rates[idx].plcp == legacy_rate)
 374                                 return idx;
 375         }
 376
 377         return IWL_RATE_INVALID;
 378 }
 379
 380 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 381                                   struct ieee80211_sta *sta,
 382                                   struct iwl_lq_sta *lq_sta,
 383                                   int tid, bool ndp);
 384 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 385                            struct ieee80211_sta *sta,
 386                            struct iwl_lq_sta *lq_sta,
 387                            const struct rs_rate *initial_rate);
 388 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 389
 390 /**
 391  * The following tables contain the expected throughput metrics for all rates
 392  *
 393  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 394  *
 395  * where invalid entries are zeros.
 396  *
 397  * CCK rates are only valid in legacy table and will only be used in G
 398  * (2.4 GHz) band.
 399  */
 400
 401 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 402         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 403 };
 404
 405 /* Expected TpT tables. 4 indexes:
 406  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 407  */
 408 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 409         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 410         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 411         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 412         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 413 };
 414
 415 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 416         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 417         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 418         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 419         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 420 };
 421
 422 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 423         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 424         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 425         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 426         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 427 };
 428
 429 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
 430         {0, 0, 0, 0, 191, 0, 244, 288,  298,  308,  313,  318,  323,  328,  330},
 431         {0, 0, 0, 0, 200, 0, 251, 293,  302,  312,  317,  322,  327,  332,  334},
 432         {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
 433         {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
 434 };
 435
 436 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 437         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 438         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 439         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 440         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 441 };
 442
 443 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 444         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 445         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 446         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 447         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 448 };
 449
 450 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 451         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 452         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 453         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 454         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 455 };
 456
 457 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
 458         {0, 0, 0, 0, 240, 0, 278,  308,  313,  319,  322,  324,  328,  330,   334},
 459         {0, 0, 0, 0, 247, 0, 282,  310,  315,  320,  323,  325,  329,  332,   338},
 460         {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629,  10592},
 461         {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
 462 };
 463
 464 /* mbps, mcs */
 465 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 466         {  "1", "BPSK DSSS"},
 467         {  "2", "QPSK DSSS"},
 468         {"5.5", "BPSK CCK"},
 469         { "11", "QPSK CCK"},
 470         {  "6", "BPSK 1/2"},
 471         {  "9", "BPSK 1/2"},
 472         { "12", "QPSK 1/2"},
 473         { "18", "QPSK 3/4"},
 474         { "24", "16QAM 1/2"},
 475         { "36", "16QAM 3/4"},
 476         { "48", "64QAM 2/3"},
 477         { "54", "64QAM 3/4"},
 478         { "60", "64QAM 5/6"},
 479 };
 480
 481 #define MCS_INDEX_PER_STREAM    (8)
 482
 483 static const char *rs_pretty_ant(u8 ant)
 484 {
 485         static const char * const ant_name[] = {
 486                 [ANT_NONE] = "None",
 487                 [ANT_A]    = "A",
 488                 [ANT_B]    = "B",
 489                 [ANT_AB]   = "AB",
 490                 [ANT_C]    = "C",
 491                 [ANT_AC]   = "AC",
 492                 [ANT_BC]   = "BC",
 493                 [ANT_ABC]  = "ABC",
 494         };
 495
 496         if (ant > ANT_ABC)
 497                 return "UNKNOWN";
 498
 499         return ant_name[ant];
 500 }
 501
 502 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 503 {
 504         static const char * const lq_types[] = {
 505                 [LQ_NONE] = "NONE",
 506                 [LQ_LEGACY_A] = "LEGACY_A",
 507                 [LQ_LEGACY_G] = "LEGACY_G",
 508                 [LQ_HT_SISO] = "HT SISO",
 509                 [LQ_HT_MIMO2] = "HT MIMO",
 510                 [LQ_VHT_SISO] = "VHT SISO",
 511                 [LQ_VHT_MIMO2] = "VHT MIMO",
 512                 [LQ_HE_SISO] = "HE SISO",
 513                 [LQ_HE_MIMO2] = "HE MIMO",
 514         };
 515
 516         if (type < LQ_NONE || type >= LQ_MAX)
 517                 return "UNKNOWN";
 518
 519         return lq_types[type];
 520 }
 521
 522 static char *rs_pretty_rate(const struct rs_rate *rate)
 523 {
 524         static char buf[40];
 525         static const char * const legacy_rates[] = {
 526                 [IWL_RATE_1M_INDEX] = "1M",
 527                 [IWL_RATE_2M_INDEX] = "2M",
 528                 [IWL_RATE_5M_INDEX] = "5.5M",
 529                 [IWL_RATE_11M_INDEX] = "11M",
 530                 [IWL_RATE_6M_INDEX] = "6M",
 531                 [IWL_RATE_9M_INDEX] = "9M",
 532                 [IWL_RATE_12M_INDEX] = "12M",
 533                 [IWL_RATE_18M_INDEX] = "18M",
 534                 [IWL_RATE_24M_INDEX] = "24M",
 535                 [IWL_RATE_36M_INDEX] = "36M",
 536                 [IWL_RATE_48M_INDEX] = "48M",
 537                 [IWL_RATE_54M_INDEX] = "54M",
 538         };
 539         static const char *const ht_vht_rates[] = {
 540                 [IWL_RATE_MCS_0_INDEX] = "MCS0",
 541                 [IWL_RATE_MCS_1_INDEX] = "MCS1",
 542                 [IWL_RATE_MCS_2_INDEX] = "MCS2",
 543                 [IWL_RATE_MCS_3_INDEX] = "MCS3",
 544                 [IWL_RATE_MCS_4_INDEX] = "MCS4",
 545                 [IWL_RATE_MCS_5_INDEX] = "MCS5",
 546                 [IWL_RATE_MCS_6_INDEX] = "MCS6",
 547                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
 548                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
 549                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
 550         };
 551         const char *rate_str;
 552
 553         if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
 554                 rate_str = legacy_rates[rate->index];
 555         else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
 556                  (rate->index >= IWL_RATE_MCS_0_INDEX) &&
 557                  (rate->index <= IWL_RATE_MCS_9_INDEX))
 558                 rate_str = ht_vht_rates[rate->index];
 559         else
 560                 rate_str = "BAD_RATE";
 561
 562         sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
 563                 rs_pretty_ant(rate->ant), rate_str);
 564         return buf;
 565 }
 566
 567 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 568                                 const char *prefix)
 569 {
 570         IWL_DEBUG_RATE(mvm,
 571                        "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
 572                        prefix, rs_pretty_rate(rate), rate->bw,
 573                        rate->sgi, rate->ldpc, rate->stbc);
 574 }
 575
 576 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 577 {
 578         window->data = 0;
 579         window->success_counter = 0;
 580         window->success_ratio = IWL_INVALID_VALUE;
 581         window->counter = 0;
 582         window->average_tpt = IWL_INVALID_VALUE;
 583 }
 584
 585 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 586                                             struct iwl_scale_tbl_info *tbl)
 587 {
 588         int i;
 589
 590         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 591         for (i = 0; i < IWL_RATE_COUNT; i++)
 592                 rs_rate_scale_clear_window(&tbl->win[i]);
 593
 594         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 595                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 596 }
 597
 598 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 599 {
 600         return (ant_type & valid_antenna) == ant_type;
 601 }
 602
 603 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 604                                      struct iwl_lq_sta *lq_data, u8 tid,
 605                                      struct ieee80211_sta *sta)
 606 {
 607         int ret = -EAGAIN;
 608
 609         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 610                      sta->addr, tid);
 611
 612         /* start BA session until the peer sends del BA */
 613         ret = ieee80211_start_tx_ba_session(sta, tid, 0);
 614         if (ret == -EAGAIN) {
 615                 /*
 616                  * driver and mac80211 is out of sync
 617                  * this might be cause by reloading firmware
 618                  * stop the tx ba session here
 619                  */
 620                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 621                         tid);
 622                 ieee80211_stop_tx_ba_session(sta, tid);
 623         }
 624         return ret;
 625 }
 626
 627 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
 628                               u8 tid, struct iwl_lq_sta *lq_sta,
 629                               struct ieee80211_sta *sta)
 630 {
 631         struct iwl_mvm_tid_data *tid_data;
 632
 633         /*
 634          * In AP mode, tid can be equal to IWL_MAX_TID_COUNT
 635          * when the frame is not QoS
 636          */
 637         if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) {
 638                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 639                         tid, IWL_MAX_TID_COUNT);
 640                 return;
 641         } else if (tid == IWL_MAX_TID_COUNT) {
 642                 return;
 643         }
 644
 645         tid_data = &mvmsta->tid_data[tid];
 646         if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED &&
 647             tid_data->state == IWL_AGG_OFF &&
 648             (lq_sta->tx_agg_tid_en & BIT(tid)) &&
 649             tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) {
 650                 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid);
 651                 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0)
 652                         tid_data->state = IWL_AGG_QUEUED;
 653         }
 654 }
 655
 656 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 657 {
 658         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 659                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 660                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 661 }
 662
 663 /*
 664  * Static function to get the expected throughput from an iwl_scale_tbl_info
 665  * that wraps a NULL pointer check
 666  */
 667 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 668 {
 669         if (tbl->expected_tpt)
 670                 return tbl->expected_tpt[rs_index];
 671         return 0;
 672 }
 673
 674 /**
 675  * rs_collect_tx_data - Update the success/failure sliding window
 676  *
 677  * We keep a sliding window of the last 62 packets transmitted
 678  * at this rate.  window->data contains the bitmask of successful
 679  * packets.
 680  */
 681 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
 682                                struct iwl_scale_tbl_info *tbl,
 683                                int scale_index, int attempts, int successes,
 684                                struct iwl_rate_scale_data *window)
 685 {
 686         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 687         s32 fail_count, tpt;
 688
 689         /* Get expected throughput */
 690         tpt = get_expected_tpt(tbl, scale_index);
 691
 692         /*
 693          * Keep track of only the latest 62 tx frame attempts in this rate's
 694          * history window; anything older isn't really relevant any more.
 695          * If we have filled up the sliding window, drop the oldest attempt;
 696          * if the oldest attempt (highest bit in bitmap) shows "success",
 697          * subtract "1" from the success counter (this is the main reason
 698          * we keep these bitmaps!).
 699          */
 700         while (attempts > 0) {
 701                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 702                         /* remove earliest */
 703                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 704
 705                         if (window->data & mask) {
 706                                 window->data &= ~mask;
 707                                 window->success_counter--;
 708                         }
 709                 }
 710
 711                 /* Increment frames-attempted counter */
 712                 window->counter++;
 713
 714                 /* Shift bitmap by one frame to throw away oldest history */
 715                 window->data <<= 1;
 716
 717                 /* Mark the most recent #successes attempts as successful */
 718                 if (successes > 0) {
 719                         window->success_counter++;
 720                         window->data |= 0x1;
 721                         successes--;
 722                 }
 723
 724                 attempts--;
 725         }
 726
 727         /* Calculate current success ratio, avoid divide-by-0! */
 728         if (window->counter > 0)
 729                 window->success_ratio = 128 * (100 * window->success_counter)
 730                                         / window->counter;
 731         else
 732                 window->success_ratio = IWL_INVALID_VALUE;
 733
 734         fail_count = window->counter - window->success_counter;
 735
 736         /* Calculate average throughput, if we have enough history. */
 737         if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
 738             (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
 739                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 740         else
 741                 window->average_tpt = IWL_INVALID_VALUE;
 742
 743         return 0;
 744 }
 745
 746 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
 747                                struct iwl_lq_sta *lq_sta,
 748                                struct iwl_scale_tbl_info *tbl,
 749                                int scale_index, int attempts, int successes,
 750                                u8 reduced_txp)
 751 {
 752         struct iwl_rate_scale_data *window = NULL;
 753
 754         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 755                 return -EINVAL;
 756
 757         window = &tbl->tpc_win[reduced_txp];
 758         return  _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 759                                     window);
 760 }
 761
 762 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm,
 763                                     struct iwl_mvm_sta *mvmsta,
 764                                     u8 tid, int successes)
 765 {
 766         struct iwl_mvm_tid_data *tid_data;
 767
 768         if (tid >= IWL_MAX_TID_COUNT)
 769                 return;
 770
 771         tid_data = &mvmsta->tid_data[tid];
 772
 773         /*
 774          * Measure if there're enough successful transmits per second.
 775          * These statistics are used only to decide if we can start a
 776          * BA session, so it should be updated only when A-MPDU is
 777          * off.
 778          */
 779         if (tid_data->state != IWL_AGG_OFF)
 780                 return;
 781
 782         if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) ||
 783             (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) {
 784                 tid_data->tx_count_last = tid_data->tx_count;
 785                 tid_data->tx_count = 0;
 786                 tid_data->tpt_meas_start = jiffies;
 787         } else {
 788                 tid_data->tx_count += successes;
 789         }
 790 }
 791
 792 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
 793                                struct iwl_mvm_sta *mvmsta, u8 tid,
 794                                struct iwl_scale_tbl_info *tbl,
 795                                int scale_index, int attempts, int successes)
 796 {
 797         struct iwl_rate_scale_data *window = NULL;
 798
 799         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 800                 return -EINVAL;
 801
 802         if (tbl->column != RS_COLUMN_INVALID) {
 803                 struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers;
 804
 805                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 806                 pers->tx_stats[tbl->column][scale_index].success += successes;
 807         }
 808
 809         rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes);
 810
 811         /* Select window for current tx bit rate */
 812         window = &(tbl->win[scale_index]);
 813         return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 814                                    window);
 815 }
 816
 817 /* Convert rs_rate object into ucode rate bitmask */
 818 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 819                                   struct rs_rate *rate)
 820 {
 821         u32 ucode_rate = 0;
 822         int index = rate->index;
 823
 824         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 825                          RATE_MCS_ANT_ABC_MSK);
 826
 827         if (is_legacy(rate)) {
 828                 ucode_rate |= iwl_rates[index].plcp;
 829                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 830                         ucode_rate |= RATE_MCS_CCK_MSK;
 831                 return ucode_rate;
 832         }
 833
 834         if (is_ht(rate)) {
 835                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 836                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 837                         index = IWL_LAST_HT_RATE;
 838                 }
 839                 ucode_rate |= RATE_MCS_HT_MSK;
 840
 841                 if (is_ht_siso(rate))
 842                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 843                 else if (is_ht_mimo2(rate))
 844                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 845                 else
 846                         WARN_ON_ONCE(1);
 847         } else if (is_vht(rate)) {
 848                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 849                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 850                         index = IWL_LAST_VHT_RATE;
 851                 }
 852                 ucode_rate |= RATE_MCS_VHT_MSK;
 853                 if (is_vht_siso(rate))
 854                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 855                 else if (is_vht_mimo2(rate))
 856                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 857                 else
 858                         WARN_ON_ONCE(1);
 859
 860         } else {
 861                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 862         }
 863
 864         if (is_siso(rate) && rate->stbc) {
 865                 /* To enable STBC we need to set both a flag and ANT_AB */
 866                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 867                 ucode_rate |= RATE_MCS_STBC_MSK;
 868         }
 869
 870         ucode_rate |= rate->bw;
 871         if (rate->sgi)
 872                 ucode_rate |= RATE_MCS_SGI_MSK;
 873         if (rate->ldpc)
 874                 ucode_rate |= RATE_MCS_LDPC_MSK;
 875
 876         return ucode_rate;
 877 }
 878
 879 /* Convert a ucode rate into an rs_rate object */
 880 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 881                                    enum nl80211_band band,
 882                                    struct rs_rate *rate)
 883 {
 884         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 885         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 886         u8 nss;
 887
 888         memset(rate, 0, sizeof(*rate));
 889         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 890
 891         if (rate->index == IWL_RATE_INVALID)
 892                 return -EINVAL;
 893
 894         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 895
 896         /* Legacy */
 897         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 898             !(ucode_rate & RATE_MCS_VHT_MSK) &&
 899             !(ucode_rate & RATE_MCS_HE_MSK)) {
 900                 if (num_of_ant == 1) {
 901                         if (band == NL80211_BAND_5GHZ)
 902                                 rate->type = LQ_LEGACY_A;
 903                         else
 904                                 rate->type = LQ_LEGACY_G;
 905                 }
 906
 907                 return 0;
 908         }
 909
 910         /* HT, VHT or HE */
 911         if (ucode_rate & RATE_MCS_SGI_MSK)
 912                 rate->sgi = true;
 913         if (ucode_rate & RATE_MCS_LDPC_MSK)
 914                 rate->ldpc = true;
 915         if (ucode_rate & RATE_MCS_STBC_MSK)
 916                 rate->stbc = true;
 917         if (ucode_rate & RATE_MCS_BF_MSK)
 918                 rate->bfer = true;
 919
 920         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 921
 922         if (ucode_rate & RATE_MCS_HT_MSK) {
 923                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 924                        RATE_HT_MCS_NSS_POS) + 1;
 925
 926                 if (nss == 1) {
 927                         rate->type = LQ_HT_SISO;
 928                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 929                                   "stbc %d bfer %d",
 930                                   rate->stbc, rate->bfer);
 931                 } else if (nss == 2) {
 932                         rate->type = LQ_HT_MIMO2;
 933                         WARN_ON_ONCE(num_of_ant != 2);
 934                 } else {
 935                         WARN_ON_ONCE(1);
 936                 }
 937         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 938                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 939                        RATE_VHT_MCS_NSS_POS) + 1;
 940
 941                 if (nss == 1) {
 942                         rate->type = LQ_VHT_SISO;
 943                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 944                                   "stbc %d bfer %d",
 945                                   rate->stbc, rate->bfer);
 946                 } else if (nss == 2) {
 947                         rate->type = LQ_VHT_MIMO2;
 948                         WARN_ON_ONCE(num_of_ant != 2);
 949                 } else {
 950                         WARN_ON_ONCE(1);
 951                 }
 952         } else if (ucode_rate & RATE_MCS_HE_MSK) {
 953                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 954                       RATE_VHT_MCS_NSS_POS) + 1;
 955
 956                 if (nss == 1) {
 957                         rate->type = LQ_HE_SISO;
 958                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 959                                   "stbc %d bfer %d", rate->stbc, rate->bfer);
 960                 } else if (nss == 2) {
 961                         rate->type = LQ_HE_MIMO2;
 962                         WARN_ON_ONCE(num_of_ant != 2);
 963                 } else {
 964                         WARN_ON_ONCE(1);
 965                 }
 966         }
 967
 968         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 969                      !is_he(rate) && !is_vht(rate));
 970
 971         return 0;
 972 }
 973
 974 /* switch to another antenna/antennas and return 1 */
 975 /* if no other valid antenna found, return 0 */
 976 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 977 {
 978         u8 new_ant_type;
 979
 980         if (!rate->ant || WARN_ON_ONCE(rate->ant & ANT_C))
 981                 return 0;
 982
 983         if (!rs_is_valid_ant(valid_ant, rate->ant))
 984                 return 0;
 985
 986         new_ant_type = ant_toggle_lookup[rate->ant];
 987
 988         while ((new_ant_type != rate->ant) &&
 989                !rs_is_valid_ant(valid_ant, new_ant_type))
 990                 new_ant_type = ant_toggle_lookup[new_ant_type];
 991
 992         if (new_ant_type == rate->ant)
 993                 return 0;
 994
 995         rate->ant = new_ant_type;
 996
 997         return 1;
 998 }
 999
1000 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
1001                                   struct rs_rate *rate)
1002 {
1003         if (is_legacy(rate))
1004                 return lq_sta->active_legacy_rate;
1005         else if (is_siso(rate))
1006                 return lq_sta->active_siso_rate;
1007         else if (is_mimo2(rate))
1008                 return lq_sta->active_mimo2_rate;
1009
1010         WARN_ON_ONCE(1);
1011         return 0;
1012 }
1013
1014 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
1015                                 int rate_type)
1016 {
1017         u8 high = IWL_RATE_INVALID;
1018         u8 low = IWL_RATE_INVALID;
1019
1020         /* 802.11A or ht walks to the next literal adjacent rate in
1021          * the rate table */
1022         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
1023                 int i;
1024                 u32 mask;
1025
1026                 /* Find the previous rate that is in the rate mask */
1027                 i = index - 1;
1028                 if (i >= 0)
1029                         mask = BIT(i);
1030                 for (; i >= 0; i--, mask >>= 1) {
1031                         if (rate_mask & mask) {
1032                                 low = i;
1033                                 break;
1034                         }
1035                 }
1036
1037                 /* Find the next rate that is in the rate mask */
1038                 i = index + 1;
1039                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
1040                         if (rate_mask & mask) {
1041                                 high = i;
1042                                 break;
1043                         }
1044                 }
1045
1046                 return (high << 8) | low;
1047         }
1048
1049         low = index;
1050         while (low != IWL_RATE_INVALID) {
1051                 low = iwl_rates[low].prev_rs;
1052                 if (low == IWL_RATE_INVALID)
1053                         break;
1054                 if (rate_mask & (1 << low))
1055                         break;
1056         }
1057
1058         high = index;
1059         while (high != IWL_RATE_INVALID) {
1060                 high = iwl_rates[high].next_rs;
1061                 if (high == IWL_RATE_INVALID)
1062                         break;
1063                 if (rate_mask & (1 << high))
1064                         break;
1065         }
1066
1067         return (high << 8) | low;
1068 }
1069
1070 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1071                                      struct rs_rate *rate)
1072 {
1073         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1074 }
1075
1076 /* Get the next supported lower rate in the current column.
1077  * Return true if bottom rate in the current column was reached
1078  */
1079 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1080                                         struct rs_rate *rate)
1081 {
1082         u8 low;
1083         u16 high_low;
1084         u16 rate_mask;
1085         struct iwl_mvm *mvm = lq_sta->pers.drv;
1086
1087         rate_mask = rs_get_supported_rates(lq_sta, rate);
1088         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1089                                         rate->type);
1090         low = high_low & 0xff;
1091
1092         /* Bottom rate of column reached */
1093         if (low == IWL_RATE_INVALID)
1094                 return true;
1095
1096         rate->index = low;
1097         return false;
1098 }
1099
1100 /* Get the next rate to use following a column downgrade */
1101 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1102                                           struct rs_rate *rate)
1103 {
1104         struct iwl_mvm *mvm = lq_sta->pers.drv;
1105
1106         if (is_legacy(rate)) {
1107                 /* No column to downgrade from Legacy */
1108                 return;
1109         } else if (is_siso(rate)) {
1110                 /* Downgrade to Legacy if we were in SISO */
1111                 if (lq_sta->band == NL80211_BAND_5GHZ)
1112                         rate->type = LQ_LEGACY_A;
1113                 else
1114                         rate->type = LQ_LEGACY_G;
1115
1116                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1117
1118                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1119                              rate->index > IWL_RATE_MCS_9_INDEX);
1120
1121                 rate->index = rs_ht_to_legacy[rate->index];
1122                 rate->ldpc = false;
1123         } else {
1124                 /* Downgrade to SISO with same MCS if in MIMO  */
1125                 rate->type = is_vht_mimo2(rate) ?
1126                         LQ_VHT_SISO : LQ_HT_SISO;
1127         }
1128
1129         if (num_of_ant(rate->ant) > 1)
1130                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1131
1132         /* Relevant in both switching to SISO or Legacy */
1133         rate->sgi = false;
1134
1135         if (!rs_rate_supported(lq_sta, rate))
1136                 rs_get_lower_rate_in_column(lq_sta, rate);
1137 }
1138
1139 /* Check if both rates share the same column */
1140 static inline bool rs_rate_column_match(struct rs_rate *a,
1141                                         struct rs_rate *b)
1142 {
1143         bool ant_match;
1144
1145         if (a->stbc || a->bfer)
1146                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1147         else
1148                 ant_match = (a->ant == b->ant);
1149
1150         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1151                 && ant_match;
1152 }
1153
1154 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1155 {
1156         if (is_legacy(rate)) {
1157                 if (rate->ant == ANT_A)
1158                         return RS_COLUMN_LEGACY_ANT_A;
1159
1160                 if (rate->ant == ANT_B)
1161                         return RS_COLUMN_LEGACY_ANT_B;
1162
1163                 goto err;
1164         }
1165
1166         if (is_siso(rate)) {
1167                 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1168                         return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1169                                 RS_COLUMN_SISO_ANT_A;
1170
1171                 if (rate->ant == ANT_B)
1172                         return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1173                                 RS_COLUMN_SISO_ANT_B;
1174
1175                 goto err;
1176         }
1177
1178         if (is_mimo(rate))
1179                 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1180
1181 err:
1182         return RS_COLUMN_INVALID;
1183 }
1184
1185 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1186 {
1187         u8 tid = IWL_MAX_TID_COUNT;
1188
1189         if (ieee80211_is_data_qos(hdr->frame_control)) {
1190                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1191                 tid = qc[0] & 0xf;
1192         }
1193
1194         if (unlikely(tid > IWL_MAX_TID_COUNT))
1195                 tid = IWL_MAX_TID_COUNT;
1196
1197         return tid;
1198 }
1199
1200 /*
1201  * mac80211 sends us Tx status
1202  */
1203 static void rs_drv_mac80211_tx_status(void *mvm_r,
1204                                       struct ieee80211_supported_band *sband,
1205                                       struct ieee80211_sta *sta, void *priv_sta,
1206                                       struct sk_buff *skb)
1207 {
1208         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1209         struct iwl_op_mode *op_mode = mvm_r;
1210         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1211         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1212         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1213
1214         if (!mvmsta->vif)
1215                 return;
1216
1217         if (!ieee80211_is_data(hdr->frame_control) ||
1218             info->flags & IEEE80211_TX_CTL_NO_ACK)
1219                 return;
1220
1221         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1222                              ieee80211_is_qos_nullfunc(hdr->frame_control));
1223 }
1224
1225 /*
1226  * Begin a period of staying with a selected modulation mode.
1227  * Set "stay_in_tbl" flag to prevent any mode switches.
1228  * Set frame tx success limits according to legacy vs. high-throughput,
1229  * and reset overall (spanning all rates) tx success history statistics.
1230  * These control how long we stay using same modulation mode before
1231  * searching for a new mode.
1232  */
1233 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1234                                  struct iwl_lq_sta *lq_sta)
1235 {
1236         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1237         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1238         if (is_legacy) {
1239                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1240                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1241                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1242         } else {
1243                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1244                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1245                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1246         }
1247         lq_sta->table_count = 0;
1248         lq_sta->total_failed = 0;
1249         lq_sta->total_success = 0;
1250         lq_sta->flush_timer = jiffies;
1251         lq_sta->visited_columns = 0;
1252 }
1253
1254 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1255 {
1256         if (rate_mask)
1257                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1258         return IWL_RATE_INVALID;
1259 }
1260
1261 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1262                                    const struct rs_tx_column *column)
1263 {
1264         switch (column->mode) {
1265         case RS_LEGACY:
1266                 return lq_sta->max_legacy_rate_idx;
1267         case RS_SISO:
1268                 return lq_sta->max_siso_rate_idx;
1269         case RS_MIMO2:
1270                 return lq_sta->max_mimo2_rate_idx;
1271         default:
1272                 WARN_ON_ONCE(1);
1273         }
1274
1275         return lq_sta->max_legacy_rate_idx;
1276 }
1277
1278 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1279                                             const struct rs_tx_column *column,
1280                                             u32 bw)
1281 {
1282         /* Used to choose among HT tables */
1283         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1284
1285         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1286                          column->mode != RS_SISO &&
1287                          column->mode != RS_MIMO2))
1288                 return expected_tpt_legacy;
1289
1290         /* Legacy rates have only one table */
1291         if (column->mode == RS_LEGACY)
1292                 return expected_tpt_legacy;
1293
1294         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1295         /* Choose among many HT tables depending on number of streams
1296          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1297          * status */
1298         if (column->mode == RS_SISO) {
1299                 switch (bw) {
1300                 case RATE_MCS_CHAN_WIDTH_20:
1301                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1302                         break;
1303                 case RATE_MCS_CHAN_WIDTH_40:
1304                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1305                         break;
1306                 case RATE_MCS_CHAN_WIDTH_80:
1307                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1308                         break;
1309                 case RATE_MCS_CHAN_WIDTH_160:
1310                         ht_tbl_pointer = expected_tpt_siso_160MHz;
1311                         break;
1312                 default:
1313                         WARN_ON_ONCE(1);
1314                 }
1315         } else if (column->mode == RS_MIMO2) {
1316                 switch (bw) {
1317                 case RATE_MCS_CHAN_WIDTH_20:
1318                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1319                         break;
1320                 case RATE_MCS_CHAN_WIDTH_40:
1321                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1322                         break;
1323                 case RATE_MCS_CHAN_WIDTH_80:
1324                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1325                         break;
1326                 case RATE_MCS_CHAN_WIDTH_160:
1327                         ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1328                         break;
1329                 default:
1330                         WARN_ON_ONCE(1);
1331                 }
1332         } else {
1333                 WARN_ON_ONCE(1);
1334         }
1335
1336         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1337                 return ht_tbl_pointer[0];
1338         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1339                 return ht_tbl_pointer[1];
1340         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1341                 return ht_tbl_pointer[2];
1342         else                                            /* AGG+SGI */
1343                 return ht_tbl_pointer[3];
1344 }
1345
1346 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1347                                       struct iwl_scale_tbl_info *tbl)
1348 {
1349         struct rs_rate *rate = &tbl->rate;
1350         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1351
1352         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1353 }
1354
1355 /* rs uses two tables, one is active and the second is for searching better
1356  * configuration. This function, according to the index of the currently
1357  * active table returns the search table, which is located at the
1358  * index complementary to 1 according to the active table (active = 1,
1359  * search = 0 or active = 0, search = 1).
1360  * Since lq_info is an arary of size 2, make sure index cannot be out of bounds.
1361  */
1362 static inline u8 rs_search_tbl(u8 active_tbl)
1363 {
1364         return (active_tbl ^ 1) & 1;
1365 }
1366
1367 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1368                             struct iwl_lq_sta *lq_sta,
1369                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1370                             unsigned long rate_mask, s8 index)
1371 {
1372         struct iwl_scale_tbl_info *active_tbl =
1373             &(lq_sta->lq_info[lq_sta->active_tbl]);
1374         s32 success_ratio = active_tbl->win[index].success_ratio;
1375         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1376         const u16 *tpt_tbl = tbl->expected_tpt;
1377         u16 high_low;
1378         u32 target_tpt;
1379         int rate_idx;
1380
1381         if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1382                 target_tpt = 100 * expected_current_tpt;
1383                 IWL_DEBUG_RATE(mvm,
1384                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1385                                success_ratio, target_tpt);
1386         } else {
1387                 target_tpt = lq_sta->last_tpt;
1388                 IWL_DEBUG_RATE(mvm,
1389                                "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1390                                success_ratio, target_tpt);
1391         }
1392
1393         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1394
1395         while (rate_idx != IWL_RATE_INVALID) {
1396                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1397                         break;
1398
1399                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1400                                                 tbl->rate.type);
1401
1402                 rate_idx = (high_low >> 8) & 0xff;
1403         }
1404
1405         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1406                        rate_idx, target_tpt,
1407                        rate_idx != IWL_RATE_INVALID ?
1408                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1409
1410         return rate_idx;
1411 }
1412
1413 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1414 {
1415         struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->vht_cap;
1416         struct ieee80211_vht_cap vht_cap = {
1417                 .vht_cap_info = cpu_to_le32(sta_vht_cap->cap),
1418                 .supp_mcs = sta_vht_cap->vht_mcs,
1419         };
1420
1421         switch (sta->bandwidth) {
1422         case IEEE80211_STA_RX_BW_160:
1423                 /*
1424                  * Don't use 160 MHz if VHT extended NSS support
1425                  * says we cannot use 2 streams, we don't want to
1426                  * deal with this.
1427                  * We only check MCS 0 - they will support that if
1428                  * we got here at all and we don't care which MCS,
1429                  * we want to determine a more global state.
1430                  */
1431                 if (ieee80211_get_vht_max_nss(&vht_cap,
1432                                               IEEE80211_VHT_CHANWIDTH_160MHZ,
1433                                               0, true) < sta->rx_nss)
1434                         return RATE_MCS_CHAN_WIDTH_80;
1435                 return RATE_MCS_CHAN_WIDTH_160;
1436         case IEEE80211_STA_RX_BW_80:
1437                 return RATE_MCS_CHAN_WIDTH_80;
1438         case IEEE80211_STA_RX_BW_40:
1439                 return RATE_MCS_CHAN_WIDTH_40;
1440         case IEEE80211_STA_RX_BW_20:
1441         default:
1442                 return RATE_MCS_CHAN_WIDTH_20;
1443         }
1444 }
1445
1446 /*
1447  * Check whether we should continue using same modulation mode, or
1448  * begin search for a new mode, based on:
1449  * 1) # tx successes or failures while using this mode
1450  * 2) # times calling this function
1451  * 3) elapsed time in this mode (not used, for now)
1452  */
1453 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1454 {
1455         struct iwl_scale_tbl_info *tbl;
1456         int active_tbl;
1457         int flush_interval_passed = 0;
1458         struct iwl_mvm *mvm;
1459
1460         mvm = lq_sta->pers.drv;
1461         active_tbl = lq_sta->active_tbl;
1462
1463         tbl = &(lq_sta->lq_info[active_tbl]);
1464
1465         /* If we've been disallowing search, see if we should now allow it */
1466         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1467                 /* Elapsed time using current modulation mode */
1468                 if (lq_sta->flush_timer)
1469                         flush_interval_passed =
1470                                 time_after(jiffies,
1471                                            (unsigned long)(lq_sta->flush_timer +
1472                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1473
1474                 /*
1475                  * Check if we should allow search for new modulation mode.
1476                  * If many frames have failed or succeeded, or we've used
1477                  * this same modulation for a long time, allow search, and
1478                  * reset history stats that keep track of whether we should
1479                  * allow a new search.  Also (below) reset all bitmaps and
1480                  * stats in active history.
1481                  */
1482                 if (force_search ||
1483                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1484                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1485                     ((!lq_sta->search_better_tbl) &&
1486                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1487                         IWL_DEBUG_RATE(mvm,
1488                                        "LQ: stay is expired %d %d %d\n",
1489                                      lq_sta->total_failed,
1490                                      lq_sta->total_success,
1491                                      flush_interval_passed);
1492
1493                         /* Allow search for new mode */
1494                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1495                         IWL_DEBUG_RATE(mvm,
1496                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1497                         lq_sta->total_failed = 0;
1498                         lq_sta->total_success = 0;
1499                         lq_sta->flush_timer = 0;
1500                         /* mark the current column as visited */
1501                         lq_sta->visited_columns = BIT(tbl->column);
1502                 /*
1503                  * Else if we've used this modulation mode enough repetitions
1504                  * (regardless of elapsed time or success/failure), reset
1505                  * history bitmaps and rate-specific stats for all rates in
1506                  * active table.
1507                  */
1508                 } else {
1509                         lq_sta->table_count++;
1510                         if (lq_sta->table_count >=
1511                             lq_sta->table_count_limit) {
1512                                 lq_sta->table_count = 0;
1513
1514                                 IWL_DEBUG_RATE(mvm,
1515                                                "LQ: stay in table clear win\n");
1516                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1517                         }
1518                 }
1519
1520                 /* If transitioning to allow "search", reset all history
1521                  * bitmaps and stats in active table (this will become the new
1522                  * "search" table). */
1523                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1524                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1525                 }
1526         }
1527 }
1528
1529 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1530                              struct iwl_scale_tbl_info *tbl,
1531                              enum rs_action scale_action)
1532 {
1533         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1534         int i;
1535
1536         /*
1537          * In case TLC offload is not active amsdu_enabled is either 0xFFFF
1538          * or 0, since there is no per-TID alg.
1539          */
1540         if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1541             tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1542             scale_action == RS_ACTION_DOWNSCALE)
1543                 mvmsta->amsdu_enabled = 0;
1544         else
1545                 mvmsta->amsdu_enabled = 0xFFFF;
1546
1547         if (mvmsta->vif->bss_conf.he_support &&
1548             !iwlwifi_mod_params.disable_11ax)
1549                 mvmsta->max_amsdu_len = sta->max_amsdu_len;
1550         else
1551                 mvmsta->max_amsdu_len = min_t(int, sta->max_amsdu_len, 8500);
1552
1553         sta->max_rc_amsdu_len = mvmsta->max_amsdu_len;
1554
1555         for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
1556                 if (mvmsta->amsdu_enabled)
1557                         sta->max_tid_amsdu_len[i] =
1558                                 iwl_mvm_max_amsdu_size(mvm, sta, i);
1559                 else
1560                         /*
1561                          * Not so elegant, but this will effectively
1562                          * prevent AMSDU on this TID
1563                          */
1564                         sta->max_tid_amsdu_len[i] = 1;
1565         }
1566 }
1567
1568 /*
1569  * setup rate table in uCode
1570  */
1571 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1572                                struct ieee80211_sta *sta,
1573                                struct iwl_lq_sta *lq_sta,
1574                                struct iwl_scale_tbl_info *tbl)
1575 {
1576         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1577         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
1578 }
1579
1580 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1581                               struct ieee80211_sta *sta,
1582                               struct iwl_lq_sta *lq_sta,
1583                               struct iwl_scale_tbl_info *tbl,
1584                               enum rs_action scale_action)
1585 {
1586         if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80)
1587                 return false;
1588
1589         if (!is_vht_siso(&tbl->rate))
1590                 return false;
1591
1592         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1593             (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1594             (scale_action == RS_ACTION_DOWNSCALE)) {
1595                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1596                 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1597                 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1598                 goto tweaked;
1599         }
1600
1601         /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1602          * sustainable, i.e. we're past the test window. We can't go back
1603          * if MCS5 is just tested as this will happen always after switching
1604          * to 20Mhz MCS4 because the rate stats are cleared.
1605          */
1606         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1607             (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1608              (scale_action == RS_ACTION_STAY)) ||
1609              ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1610               (scale_action == RS_ACTION_UPSCALE)))) {
1611                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1612                 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1613                 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1614                 goto tweaked;
1615         }
1616
1617         return false;
1618
1619 tweaked:
1620         rs_set_expected_tpt_table(lq_sta, tbl);
1621         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1622         return true;
1623 }
1624
1625 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1626                                          struct iwl_lq_sta *lq_sta,
1627                                          struct ieee80211_sta *sta,
1628                                          struct iwl_scale_tbl_info *tbl)
1629 {
1630         int i, j, max_rate;
1631         enum rs_column next_col_id;
1632         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1633         const struct rs_tx_column *next_col;
1634         allow_column_func_t allow_func;
1635         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1636         const u16 *expected_tpt_tbl;
1637         u16 tpt, max_expected_tpt;
1638
1639         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1640                 next_col_id = curr_col->next_columns[i];
1641
1642                 if (next_col_id == RS_COLUMN_INVALID)
1643                         continue;
1644
1645                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1646                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1647                                        next_col_id);
1648                         continue;
1649                 }
1650
1651                 next_col = &rs_tx_columns[next_col_id];
1652
1653                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1654                         IWL_DEBUG_RATE(mvm,
1655                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1656                                        next_col_id, valid_ants, next_col->ant);
1657                         continue;
1658                 }
1659
1660                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1661                         allow_func = next_col->checks[j];
1662                         if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1663                                                       next_col))
1664                                 break;
1665                 }
1666
1667                 if (j != MAX_COLUMN_CHECKS) {
1668                         IWL_DEBUG_RATE(mvm,
1669                                        "Skip column %d: not allowed (check %d failed)\n",
1670                                        next_col_id, j);
1671
1672                         continue;
1673                 }
1674
1675                 tpt = lq_sta->last_tpt / 100;
1676                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1677                                                      rs_bw_from_sta_bw(sta));
1678                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1679                         continue;
1680
1681                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1682                 if (max_rate == IWL_RATE_INVALID) {
1683                         IWL_DEBUG_RATE(mvm,
1684                                        "Skip column %d: no rate is allowed in this column\n",
1685                                        next_col_id);
1686                         continue;
1687                 }
1688
1689                 max_expected_tpt = expected_tpt_tbl[max_rate];
1690                 if (tpt >= max_expected_tpt) {
1691                         IWL_DEBUG_RATE(mvm,
1692                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1693                                        next_col_id, max_expected_tpt, tpt);
1694                         continue;
1695                 }
1696
1697                 IWL_DEBUG_RATE(mvm,
1698                                "Found potential column %d. Max expected %d current %d\n",
1699                                next_col_id, max_expected_tpt, tpt);
1700                 break;
1701         }
1702
1703         if (i == MAX_NEXT_COLUMNS)
1704                 return RS_COLUMN_INVALID;
1705
1706         return next_col_id;
1707 }
1708
1709 static int rs_switch_to_column(struct iwl_mvm *mvm,
1710                                struct iwl_lq_sta *lq_sta,
1711                                struct ieee80211_sta *sta,
1712                                enum rs_column col_id)
1713 {
1714         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
1715         struct iwl_scale_tbl_info *search_tbl =
1716                 &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
1717         struct rs_rate *rate = &search_tbl->rate;
1718         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1719         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1720         unsigned long rate_mask = 0;
1721         u32 rate_idx = 0;
1722
1723         memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1724
1725         rate->sgi = column->sgi;
1726         rate->ant = column->ant;
1727
1728         if (column->mode == RS_LEGACY) {
1729                 if (lq_sta->band == NL80211_BAND_5GHZ)
1730                         rate->type = LQ_LEGACY_A;
1731                 else
1732                         rate->type = LQ_LEGACY_G;
1733
1734                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1735                 rate->ldpc = false;
1736                 rate_mask = lq_sta->active_legacy_rate;
1737         } else if (column->mode == RS_SISO) {
1738                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1739                 rate_mask = lq_sta->active_siso_rate;
1740         } else if (column->mode == RS_MIMO2) {
1741                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1742                 rate_mask = lq_sta->active_mimo2_rate;
1743         } else {
1744                 WARN_ONCE(1, "Bad column mode");
1745         }
1746
1747         if (column->mode != RS_LEGACY) {
1748                 rate->bw = rs_bw_from_sta_bw(sta);
1749                 rate->ldpc = lq_sta->ldpc;
1750         }
1751
1752         search_tbl->column = col_id;
1753         rs_set_expected_tpt_table(lq_sta, search_tbl);
1754
1755         lq_sta->visited_columns |= BIT(col_id);
1756
1757         /* Get the best matching rate if we're changing modes. e.g.
1758          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1759          */
1760         if (curr_column->mode != column->mode) {
1761                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1762                                             rate_mask, rate->index);
1763
1764                 if ((rate_idx == IWL_RATE_INVALID) ||
1765                     !(BIT(rate_idx) & rate_mask)) {
1766                         IWL_DEBUG_RATE(mvm,
1767                                        "can not switch with index %d"
1768                                        " rate mask %lx\n",
1769                                        rate_idx, rate_mask);
1770
1771                         goto err;
1772                 }
1773
1774                 rate->index = rate_idx;
1775         }
1776
1777         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1778                        col_id, rate->index);
1779
1780         return 0;
1781
1782 err:
1783         rate->type = LQ_NONE;
1784         return -1;
1785 }
1786
1787 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1788                                          struct iwl_scale_tbl_info *tbl,
1789                                          s32 sr, int low, int high,
1790                                          int current_tpt,
1791                                          int low_tpt, int high_tpt)
1792 {
1793         enum rs_action action = RS_ACTION_STAY;
1794
1795         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1796             (current_tpt == 0)) {
1797                 IWL_DEBUG_RATE(mvm,
1798                                "Decrease rate because of low SR\n");
1799                 return RS_ACTION_DOWNSCALE;
1800         }
1801
1802         if ((low_tpt == IWL_INVALID_VALUE) &&
1803             (high_tpt == IWL_INVALID_VALUE) &&
1804             (high != IWL_RATE_INVALID)) {
1805                 IWL_DEBUG_RATE(mvm,
1806                                "No data about high/low rates. Increase rate\n");
1807                 return RS_ACTION_UPSCALE;
1808         }
1809
1810         if ((high_tpt == IWL_INVALID_VALUE) &&
1811             (high != IWL_RATE_INVALID) &&
1812             (low_tpt != IWL_INVALID_VALUE) &&
1813             (low_tpt < current_tpt)) {
1814                 IWL_DEBUG_RATE(mvm,
1815                                "No data about high rate and low rate is worse. Increase rate\n");
1816                 return RS_ACTION_UPSCALE;
1817         }
1818
1819         if ((high_tpt != IWL_INVALID_VALUE) &&
1820             (high_tpt > current_tpt)) {
1821                 IWL_DEBUG_RATE(mvm,
1822                                "Higher rate is better. Increate rate\n");
1823                 return RS_ACTION_UPSCALE;
1824         }
1825
1826         if ((low_tpt != IWL_INVALID_VALUE) &&
1827             (high_tpt != IWL_INVALID_VALUE) &&
1828             (low_tpt < current_tpt) &&
1829             (high_tpt < current_tpt)) {
1830                 IWL_DEBUG_RATE(mvm,
1831                                "Both high and low are worse. Maintain rate\n");
1832                 return RS_ACTION_STAY;
1833         }
1834
1835         if ((low_tpt != IWL_INVALID_VALUE) &&
1836             (low_tpt > current_tpt)) {
1837                 IWL_DEBUG_RATE(mvm,
1838                                "Lower rate is better\n");
1839                 action = RS_ACTION_DOWNSCALE;
1840                 goto out;
1841         }
1842
1843         if ((low_tpt == IWL_INVALID_VALUE) &&
1844             (low != IWL_RATE_INVALID)) {
1845                 IWL_DEBUG_RATE(mvm,
1846                                "No data about lower rate\n");
1847                 action = RS_ACTION_DOWNSCALE;
1848                 goto out;
1849         }
1850
1851         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1852
1853 out:
1854         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1855                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1856                         IWL_DEBUG_RATE(mvm,
1857                                        "SR is above NO DECREASE. Avoid downscale\n");
1858                         action = RS_ACTION_STAY;
1859                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1860                         IWL_DEBUG_RATE(mvm,
1861                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1862                         action = RS_ACTION_STAY;
1863                 } else {
1864                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1865                 }
1866         }
1867
1868         return action;
1869 }
1870
1871 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1872                           struct iwl_lq_sta *lq_sta)
1873 {
1874         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1875          * supports STBC of at least 1*SS
1876          */
1877         if (!lq_sta->stbc_capable)
1878                 return false;
1879
1880         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1881                 return false;
1882
1883         return true;
1884 }
1885
1886 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1887                                 int *weaker, int *stronger)
1888 {
1889         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1890         if (*weaker > TPC_MAX_REDUCTION)
1891                 *weaker = TPC_INVALID;
1892
1893         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1894         if (*stronger < 0)
1895                 *stronger = TPC_INVALID;
1896 }
1897
1898 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1899                            struct rs_rate *rate, enum nl80211_band band)
1900 {
1901         int index = rate->index;
1902         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1903         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1904                                 !vif->bss_conf.ps);
1905
1906         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1907                        cam, sta_ps_disabled);
1908         /*
1909          * allow tpc only if power management is enabled, or bt coex
1910          * activity grade allows it and we are on 2.4Ghz.
1911          */
1912         if ((cam || sta_ps_disabled) &&
1913             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1914                 return false;
1915
1916         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1917         if (is_legacy(rate))
1918                 return index == IWL_RATE_54M_INDEX;
1919         if (is_ht(rate))
1920                 return index == IWL_RATE_MCS_7_INDEX;
1921         if (is_vht(rate))
1922                 return index == IWL_RATE_MCS_7_INDEX ||
1923                        index == IWL_RATE_MCS_8_INDEX ||
1924                        index == IWL_RATE_MCS_9_INDEX;
1925
1926         WARN_ON_ONCE(1);
1927         return false;
1928 }
1929
1930 enum tpc_action {
1931         TPC_ACTION_STAY,
1932         TPC_ACTION_DECREASE,
1933         TPC_ACTION_INCREASE,
1934         TPC_ACTION_NO_RESTIRCTION,
1935 };
1936
1937 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1938                                          s32 sr, int weak, int strong,
1939                                          int current_tpt,
1940                                          int weak_tpt, int strong_tpt)
1941 {
1942         /* stay until we have valid tpt */
1943         if (current_tpt == IWL_INVALID_VALUE) {
1944                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1945                 return TPC_ACTION_STAY;
1946         }
1947
1948         /* Too many failures, increase txp */
1949         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1950             current_tpt == 0) {
1951                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1952                 return TPC_ACTION_NO_RESTIRCTION;
1953         }
1954
1955         /* try decreasing first if applicable */
1956         if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1957             weak != TPC_INVALID) {
1958                 if (weak_tpt == IWL_INVALID_VALUE &&
1959                     (strong_tpt == IWL_INVALID_VALUE ||
1960                      current_tpt >= strong_tpt)) {
1961                         IWL_DEBUG_RATE(mvm,
1962                                        "no weak txp measurement. decrease txp\n");
1963                         return TPC_ACTION_DECREASE;
1964                 }
1965
1966                 if (weak_tpt > current_tpt) {
1967                         IWL_DEBUG_RATE(mvm,
1968                                        "lower txp has better tpt. decrease txp\n");
1969                         return TPC_ACTION_DECREASE;
1970                 }
1971         }
1972
1973         /* next, increase if needed */
1974         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1975             strong != TPC_INVALID) {
1976                 if (weak_tpt == IWL_INVALID_VALUE &&
1977                     strong_tpt != IWL_INVALID_VALUE &&
1978                     current_tpt < strong_tpt) {
1979                         IWL_DEBUG_RATE(mvm,
1980                                        "higher txp has better tpt. increase txp\n");
1981                         return TPC_ACTION_INCREASE;
1982                 }
1983
1984                 if (weak_tpt < current_tpt &&
1985                     (strong_tpt == IWL_INVALID_VALUE ||
1986                      strong_tpt > current_tpt)) {
1987                         IWL_DEBUG_RATE(mvm,
1988                                        "lower txp has worse tpt. increase txp\n");
1989                         return TPC_ACTION_INCREASE;
1990                 }
1991         }
1992
1993         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1994         return TPC_ACTION_STAY;
1995 }
1996
1997 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1998                            struct ieee80211_sta *sta,
1999                            struct iwl_lq_sta *lq_sta,
2000                            struct iwl_scale_tbl_info *tbl)
2001 {
2002         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2003         struct ieee80211_vif *vif = mvm_sta->vif;
2004         struct ieee80211_chanctx_conf *chanctx_conf;
2005         enum nl80211_band band;
2006         struct iwl_rate_scale_data *window;
2007         struct rs_rate *rate = &tbl->rate;
2008         enum tpc_action action;
2009         s32 sr;
2010         u8 cur = lq_sta->lq.reduced_tpc;
2011         int current_tpt;
2012         int weak, strong;
2013         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2014
2015 #ifdef CONFIG_MAC80211_DEBUGFS
2016         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2017                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2018                                lq_sta->pers.dbg_fixed_txp_reduction);
2019                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2020                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2021         }
2022 #endif
2023
2024         rcu_read_lock();
2025         chanctx_conf = rcu_dereference(vif->chanctx_conf);
2026         if (WARN_ON(!chanctx_conf))
2027                 band = NUM_NL80211_BANDS;
2028         else
2029                 band = chanctx_conf->def.chan->band;
2030         rcu_read_unlock();
2031
2032         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2033                 IWL_DEBUG_RATE(mvm,
2034                                "tpc is not allowed. remove txp restrictions\n");
2035                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2036                 return cur != TPC_NO_REDUCTION;
2037         }
2038
2039         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2040
2041         /* Collect measured throughputs for current and adjacent rates */
2042         window = tbl->tpc_win;
2043         sr = window[cur].success_ratio;
2044         current_tpt = window[cur].average_tpt;
2045         if (weak != TPC_INVALID)
2046                 weak_tpt = window[weak].average_tpt;
2047         if (strong != TPC_INVALID)
2048                 strong_tpt = window[strong].average_tpt;
2049
2050         IWL_DEBUG_RATE(mvm,
2051                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2052                        cur, current_tpt, sr, weak, strong,
2053                        weak_tpt, strong_tpt);
2054
2055         action = rs_get_tpc_action(mvm, sr, weak, strong,
2056                                    current_tpt, weak_tpt, strong_tpt);
2057
2058         /* override actions if we are on the edge */
2059         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2060                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2061                 action = TPC_ACTION_STAY;
2062         } else if (strong == TPC_INVALID &&
2063                    (action == TPC_ACTION_INCREASE ||
2064                     action == TPC_ACTION_NO_RESTIRCTION)) {
2065                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2066                 action = TPC_ACTION_STAY;
2067         }
2068
2069         switch (action) {
2070         case TPC_ACTION_DECREASE:
2071                 lq_sta->lq.reduced_tpc = weak;
2072                 return true;
2073         case TPC_ACTION_INCREASE:
2074                 lq_sta->lq.reduced_tpc = strong;
2075                 return true;
2076         case TPC_ACTION_NO_RESTIRCTION:
2077                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2078                 return true;
2079         case TPC_ACTION_STAY:
2080                 /* do nothing */
2081                 break;
2082         }
2083         return false;
2084 }
2085
2086 /*
2087  * Do rate scaling and search for new modulation mode.
2088  */
2089 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2090                                   struct ieee80211_sta *sta,
2091                                   struct iwl_lq_sta *lq_sta,
2092                                   int tid, bool ndp)
2093 {
2094         int low = IWL_RATE_INVALID;
2095         int high = IWL_RATE_INVALID;
2096         int index;
2097         struct iwl_rate_scale_data *window = NULL;
2098         int current_tpt = IWL_INVALID_VALUE;
2099         int low_tpt = IWL_INVALID_VALUE;
2100         int high_tpt = IWL_INVALID_VALUE;
2101         u32 fail_count;
2102         enum rs_action scale_action = RS_ACTION_STAY;
2103         u16 rate_mask;
2104         u8 update_lq = 0;
2105         struct iwl_scale_tbl_info *tbl, *tbl1;
2106         u8 active_tbl = 0;
2107         u8 done_search = 0;
2108         u16 high_low;
2109         s32 sr;
2110         u8 prev_agg = lq_sta->is_agg;
2111         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2112         struct rs_rate *rate;
2113
2114         lq_sta->is_agg = !!mvmsta->agg_tids;
2115
2116         /*
2117          * Select rate-scale / modulation-mode table to work with in
2118          * the rest of this function:  "search" if searching for better
2119          * modulation mode, or "active" if doing rate scaling within a mode.
2120          */
2121         if (!lq_sta->search_better_tbl)
2122                 active_tbl = lq_sta->active_tbl;
2123         else
2124                 active_tbl = rs_search_tbl(lq_sta->active_tbl);
2125
2126         tbl = &(lq_sta->lq_info[active_tbl]);
2127         rate = &tbl->rate;
2128
2129         if (prev_agg != lq_sta->is_agg) {
2130                 IWL_DEBUG_RATE(mvm,
2131                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2132                                prev_agg, lq_sta->is_agg);
2133                 rs_set_expected_tpt_table(lq_sta, tbl);
2134                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2135         }
2136
2137         /* current tx rate */
2138         index = rate->index;
2139
2140         /* rates available for this association, and for modulation mode */
2141         rate_mask = rs_get_supported_rates(lq_sta, rate);
2142
2143         if (!(BIT(index) & rate_mask)) {
2144                 IWL_ERR(mvm, "Current Rate is not valid\n");
2145                 if (lq_sta->search_better_tbl) {
2146                         /* revert to active table if search table is not valid*/
2147                         rate->type = LQ_NONE;
2148                         lq_sta->search_better_tbl = 0;
2149                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2150                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2151                 }
2152                 return;
2153         }
2154
2155         /* Get expected throughput table and history window for current rate */
2156         if (!tbl->expected_tpt) {
2157                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2158                 return;
2159         }
2160
2161         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2162         window = &(tbl->win[index]);
2163
2164         /*
2165          * If there is not enough history to calculate actual average
2166          * throughput, keep analyzing results of more tx frames, without
2167          * changing rate or mode (bypass most of the rest of this function).
2168          * Set up new rate table in uCode only if old rate is not supported
2169          * in current association (use new rate found above).
2170          */
2171         fail_count = window->counter - window->success_counter;
2172         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2173             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2174                 IWL_DEBUG_RATE(mvm,
2175                                "%s: Test Window: succ %d total %d\n",
2176                                rs_pretty_rate(rate),
2177                                window->success_counter, window->counter);
2178
2179                 /* Can't calculate this yet; not enough history */
2180                 window->average_tpt = IWL_INVALID_VALUE;
2181
2182                 /* Should we stay with this modulation mode,
2183                  * or search for a new one? */
2184                 rs_stay_in_table(lq_sta, false);
2185
2186                 return;
2187         }
2188
2189         /* If we are searching for better modulation mode, check success. */
2190         if (lq_sta->search_better_tbl) {
2191                 /* If good success, continue using the "search" mode;
2192                  * no need to send new link quality command, since we're
2193                  * continuing to use the setup that we've been trying. */
2194                 if (window->average_tpt > lq_sta->last_tpt) {
2195                         IWL_DEBUG_RATE(mvm,
2196                                        "SWITCHING TO NEW TABLE SR: %d "
2197                                        "cur-tpt %d old-tpt %d\n",
2198                                        window->success_ratio,
2199                                        window->average_tpt,
2200                                        lq_sta->last_tpt);
2201
2202                         /* Swap tables; "search" becomes "active" */
2203                         lq_sta->active_tbl = active_tbl;
2204                         current_tpt = window->average_tpt;
2205                 /* Else poor success; go back to mode in "active" table */
2206                 } else {
2207                         IWL_DEBUG_RATE(mvm,
2208                                        "GOING BACK TO THE OLD TABLE: SR %d "
2209                                        "cur-tpt %d old-tpt %d\n",
2210                                        window->success_ratio,
2211                                        window->average_tpt,
2212                                        lq_sta->last_tpt);
2213
2214                         /* Nullify "search" table */
2215                         rate->type = LQ_NONE;
2216
2217                         /* Revert to "active" table */
2218                         active_tbl = lq_sta->active_tbl;
2219                         tbl = &(lq_sta->lq_info[active_tbl]);
2220
2221                         /* Revert to "active" rate and throughput info */
2222                         index = tbl->rate.index;
2223                         current_tpt = lq_sta->last_tpt;
2224
2225                         /* Need to set up a new rate table in uCode */
2226                         update_lq = 1;
2227                 }
2228
2229                 /* Either way, we've made a decision; modulation mode
2230                  * search is done, allow rate adjustment next time. */
2231                 lq_sta->search_better_tbl = 0;
2232                 done_search = 1;        /* Don't switch modes below! */
2233                 goto lq_update;
2234         }
2235
2236         /* (Else) not in search of better modulation mode, try for better
2237          * starting rate, while staying in this mode. */
2238         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2239         low = high_low & 0xff;
2240         high = (high_low >> 8) & 0xff;
2241
2242         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2243
2244         sr = window->success_ratio;
2245
2246         /* Collect measured throughputs for current and adjacent rates */
2247         current_tpt = window->average_tpt;
2248         if (low != IWL_RATE_INVALID)
2249                 low_tpt = tbl->win[low].average_tpt;
2250         if (high != IWL_RATE_INVALID)
2251                 high_tpt = tbl->win[high].average_tpt;
2252
2253         IWL_DEBUG_RATE(mvm,
2254                        "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2255                        rs_pretty_rate(rate), current_tpt, sr,
2256                        low, high, low_tpt, high_tpt);
2257
2258         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2259                                           current_tpt, low_tpt, high_tpt);
2260
2261         /* Force a search in case BT doesn't like us being in MIMO */
2262         if (is_mimo(rate) &&
2263             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2264                 IWL_DEBUG_RATE(mvm,
2265                                "BT Coex forbids MIMO. Search for new config\n");
2266                 rs_stay_in_table(lq_sta, true);
2267                 goto lq_update;
2268         }
2269
2270         switch (scale_action) {
2271         case RS_ACTION_DOWNSCALE:
2272                 /* Decrease starting rate, update uCode's rate table */
2273                 if (low != IWL_RATE_INVALID) {
2274                         update_lq = 1;
2275                         index = low;
2276                 } else {
2277                         IWL_DEBUG_RATE(mvm,
2278                                        "At the bottom rate. Can't decrease\n");
2279                 }
2280
2281                 break;
2282         case RS_ACTION_UPSCALE:
2283                 /* Increase starting rate, update uCode's rate table */
2284                 if (high != IWL_RATE_INVALID) {
2285                         update_lq = 1;
2286                         index = high;
2287                 } else {
2288                         IWL_DEBUG_RATE(mvm,
2289                                        "At the top rate. Can't increase\n");
2290                 }
2291
2292                 break;
2293         case RS_ACTION_STAY:
2294                 /* No change */
2295                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2296                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2297                 break;
2298         default:
2299                 break;
2300         }
2301
2302 lq_update:
2303         /* Replace uCode's rate table for the destination station. */
2304         if (update_lq) {
2305                 tbl->rate.index = index;
2306                 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2307                         rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2308                 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2309                 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2310         }
2311
2312         rs_stay_in_table(lq_sta, false);
2313
2314         /*
2315          * Search for new modulation mode if we're:
2316          * 1)  Not changing rates right now
2317          * 2)  Not just finishing up a search
2318          * 3)  Allowing a new search
2319          */
2320         if (!update_lq && !done_search &&
2321             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2322             && window->counter) {
2323                 enum rs_column next_column;
2324
2325                 /* Save current throughput to compare with "search" throughput*/
2326                 lq_sta->last_tpt = current_tpt;
2327
2328                 IWL_DEBUG_RATE(mvm,
2329                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2330                                update_lq, done_search, lq_sta->rs_state,
2331                                window->counter);
2332
2333                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2334                 if (next_column != RS_COLUMN_INVALID) {
2335                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2336                                                       next_column);
2337                         if (!ret)
2338                                 lq_sta->search_better_tbl = 1;
2339                 } else {
2340                         IWL_DEBUG_RATE(mvm,
2341                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2342                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2343                 }
2344
2345                 /* If new "search" mode was selected, set up in uCode table */
2346                 if (lq_sta->search_better_tbl) {
2347                         /* Access the "search" table, clear its history. */
2348                         tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
2349                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2350
2351                         /* Use new "search" start rate */
2352                         index = tbl->rate.index;
2353
2354                         rs_dump_rate(mvm, &tbl->rate,
2355                                      "Switch to SEARCH TABLE:");
2356                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2357                 } else {
2358                         done_search = 1;
2359                 }
2360         }
2361
2362         if (!ndp)
2363                 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2364
2365         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2366                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2367                 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2368         }
2369 }
2370
2371 struct rs_init_rate_info {
2372         s8 rssi;
2373         u8 rate_idx;
2374 };
2375
2376 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2377         { -60, IWL_RATE_54M_INDEX },
2378         { -64, IWL_RATE_48M_INDEX },
2379         { -68, IWL_RATE_36M_INDEX },
2380         { -80, IWL_RATE_24M_INDEX },
2381         { -84, IWL_RATE_18M_INDEX },
2382         { -85, IWL_RATE_12M_INDEX },
2383         { -86, IWL_RATE_11M_INDEX },
2384         { -88, IWL_RATE_5M_INDEX  },
2385         { -90, IWL_RATE_2M_INDEX  },
2386         { S8_MIN, IWL_RATE_1M_INDEX },
2387 };
2388
2389 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2390         { -60, IWL_RATE_54M_INDEX },
2391         { -64, IWL_RATE_48M_INDEX },
2392         { -72, IWL_RATE_36M_INDEX },
2393         { -80, IWL_RATE_24M_INDEX },
2394         { -84, IWL_RATE_18M_INDEX },
2395         { -85, IWL_RATE_12M_INDEX },
2396         { -87, IWL_RATE_9M_INDEX  },
2397         { S8_MIN, IWL_RATE_6M_INDEX },
2398 };
2399
2400 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2401         { -60, IWL_RATE_MCS_7_INDEX },
2402         { -64, IWL_RATE_MCS_6_INDEX },
2403         { -68, IWL_RATE_MCS_5_INDEX },
2404         { -72, IWL_RATE_MCS_4_INDEX },
2405         { -80, IWL_RATE_MCS_3_INDEX },
2406         { -84, IWL_RATE_MCS_2_INDEX },
2407         { -85, IWL_RATE_MCS_1_INDEX },
2408         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2409 };
2410
2411 /* MCS index 9 is not valid for 20MHz VHT channel width,
2412  * but is ok for 40, 80 and 160MHz channels.
2413  */
2414 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2415         { -60, IWL_RATE_MCS_8_INDEX },
2416         { -64, IWL_RATE_MCS_7_INDEX },
2417         { -68, IWL_RATE_MCS_6_INDEX },
2418         { -72, IWL_RATE_MCS_5_INDEX },
2419         { -80, IWL_RATE_MCS_4_INDEX },
2420         { -84, IWL_RATE_MCS_3_INDEX },
2421         { -85, IWL_RATE_MCS_2_INDEX },
2422         { -87, IWL_RATE_MCS_1_INDEX },
2423         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2424 };
2425
2426 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2427         { -60, IWL_RATE_MCS_9_INDEX },
2428         { -64, IWL_RATE_MCS_8_INDEX },
2429         { -68, IWL_RATE_MCS_7_INDEX },
2430         { -72, IWL_RATE_MCS_6_INDEX },
2431         { -80, IWL_RATE_MCS_5_INDEX },
2432         { -84, IWL_RATE_MCS_4_INDEX },
2433         { -85, IWL_RATE_MCS_3_INDEX },
2434         { -87, IWL_RATE_MCS_2_INDEX },
2435         { -88, IWL_RATE_MCS_1_INDEX },
2436         { S8_MIN, IWL_RATE_MCS_0_INDEX },
2437 };
2438
2439 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2440
2441 /* Init the optimal rate based on STA caps
2442  * This combined with rssi is used to report the last tx rate
2443  * to userspace when we haven't transmitted enough frames.
2444  */
2445 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2446                                  struct ieee80211_sta *sta,
2447                                  struct iwl_lq_sta *lq_sta)
2448 {
2449         struct rs_rate *rate = &lq_sta->optimal_rate;
2450
2451         if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2452                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2453         else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2454                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2455         else if (lq_sta->band == NL80211_BAND_5GHZ)
2456                 rate->type = LQ_LEGACY_A;
2457         else
2458                 rate->type = LQ_LEGACY_G;
2459
2460         rate->bw = rs_bw_from_sta_bw(sta);
2461         rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2462
2463         /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2464
2465         if (is_mimo(rate)) {
2466                 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2467         } else if (is_siso(rate)) {
2468                 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2469         } else {
2470                 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2471
2472                 if (lq_sta->band == NL80211_BAND_5GHZ) {
2473                         lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2474                         lq_sta->optimal_nentries =
2475                                 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2476                 } else {
2477                         lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2478                         lq_sta->optimal_nentries =
2479                                 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2480                 }
2481         }
2482
2483         if (is_vht(rate)) {
2484                 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2485                         lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2486                         lq_sta->optimal_nentries =
2487                                 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2488                 } else {
2489                         lq_sta->optimal_rates = rs_optimal_rates_vht;
2490                         lq_sta->optimal_nentries =
2491                                 ARRAY_SIZE(rs_optimal_rates_vht);
2492                 }
2493         } else if (is_ht(rate)) {
2494                 lq_sta->optimal_rates = rs_optimal_rates_ht;
2495                 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2496         }
2497 }
2498
2499 /* Compute the optimal rate index based on RSSI */
2500 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2501                                            struct iwl_lq_sta *lq_sta)
2502 {
2503         struct rs_rate *rate = &lq_sta->optimal_rate;
2504         int i;
2505
2506         rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2507                                      BITS_PER_LONG);
2508
2509         for (i = 0; i < lq_sta->optimal_nentries; i++) {
2510                 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2511
2512                 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2513                     (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2514                         rate->index = rate_idx;
2515                         break;
2516                 }
2517         }
2518
2519         return rate;
2520 }
2521
2522 /* Choose an initial legacy rate and antenna to use based on the RSSI
2523  * of last Rx
2524  */
2525 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2526                                 struct ieee80211_sta *sta,
2527                                 struct iwl_lq_sta *lq_sta,
2528                                 enum nl80211_band band,
2529                                 struct rs_rate *rate)
2530 {
2531         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2532         int i, nentries;
2533         unsigned long active_rate;
2534         s8 best_rssi = S8_MIN;
2535         u8 best_ant = ANT_NONE;
2536         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2537         const struct rs_init_rate_info *initial_rates;
2538
2539         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2540                 if (!(lq_sta->pers.chains & BIT(i)))
2541                         continue;
2542
2543                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2544                         best_rssi = lq_sta->pers.chain_signal[i];
2545                         best_ant = BIT(i);
2546                 }
2547         }
2548
2549         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2550                        rs_pretty_ant(best_ant), best_rssi);
2551
2552         if (best_ant != ANT_A && best_ant != ANT_B)
2553                 rate->ant = first_antenna(valid_tx_ant);
2554         else
2555                 rate->ant = best_ant;
2556
2557         rate->sgi = false;
2558         rate->ldpc = false;
2559         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2560
2561         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2562                                      BITS_PER_LONG);
2563
2564         if (band == NL80211_BAND_5GHZ) {
2565                 rate->type = LQ_LEGACY_A;
2566                 initial_rates = rs_optimal_rates_5ghz_legacy;
2567                 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2568         } else {
2569                 rate->type = LQ_LEGACY_G;
2570                 initial_rates = rs_optimal_rates_24ghz_legacy;
2571                 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2572         }
2573
2574         if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2575                 goto out;
2576
2577         /* Start from a higher rate if the corresponding debug capability
2578          * is enabled. The rate is chosen according to AP capabilities.
2579          * In case of VHT/HT when the rssi is low fallback to the case of
2580          * legacy rates.
2581          */
2582         if (sta->vht_cap.vht_supported &&
2583             best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2584                 /*
2585                  * In AP mode, when a new station associates, rs is initialized
2586                  * immediately upon association completion, before the phy
2587                  * context is updated with the association parameters, so the
2588                  * sta bandwidth might be wider than the phy context allows.
2589                  * To avoid this issue, always initialize rs with 20mhz
2590                  * bandwidth rate, and after authorization, when the phy context
2591                  * is already up-to-date, re-init rs with the correct bw.
2592                  */
2593                 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ?
2594                                 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2595
2596                 switch (bw) {
2597                 case RATE_MCS_CHAN_WIDTH_40:
2598                 case RATE_MCS_CHAN_WIDTH_80:
2599                 case RATE_MCS_CHAN_WIDTH_160:
2600                         initial_rates = rs_optimal_rates_vht;
2601                         nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2602                         break;
2603                 case RATE_MCS_CHAN_WIDTH_20:
2604                         initial_rates = rs_optimal_rates_vht_20mhz;
2605                         nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2606                         break;
2607                 default:
2608                         IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2609                         goto out;
2610                 }
2611
2612                 active_rate = lq_sta->active_siso_rate;
2613                 rate->type = LQ_VHT_SISO;
2614                 rate->bw = bw;
2615         } else if (sta->ht_cap.ht_supported &&
2616                    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2617                 initial_rates = rs_optimal_rates_ht;
2618                 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2619                 active_rate = lq_sta->active_siso_rate;
2620                 rate->type = LQ_HT_SISO;
2621         } else {
2622                 active_rate = lq_sta->active_legacy_rate;
2623         }
2624
2625         for (i = 0; i < nentries; i++) {
2626                 int rate_idx = initial_rates[i].rate_idx;
2627
2628                 if ((best_rssi >= initial_rates[i].rssi) &&
2629                     (BIT(rate_idx) & active_rate)) {
2630                         rate->index = rate_idx;
2631                         break;
2632                 }
2633         }
2634
2635 out:
2636         rs_dump_rate(mvm, rate, "INITIAL");
2637 }
2638
2639 /* Save info about RSSI of last Rx */
2640 void rs_update_last_rssi(struct iwl_mvm *mvm,
2641                          struct iwl_mvm_sta *mvmsta,
2642                          struct ieee80211_rx_status *rx_status)
2643 {
2644         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2645         int i;
2646
2647         lq_sta->pers.chains = rx_status->chains;
2648         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2649         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2650         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2651         lq_sta->pers.last_rssi = S8_MIN;
2652
2653         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2654                 if (!(lq_sta->pers.chains & BIT(i)))
2655                         continue;
2656
2657                 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2658                         lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2659         }
2660 }
2661
2662 /**
2663  * rs_initialize_lq - Initialize a station's hardware rate table
2664  *
2665  * The uCode's station table contains a table of fallback rates
2666  * for automatic fallback during transmission.
2667  *
2668  * NOTE: This sets up a default set of values.  These will be replaced later
2669  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2670  *       rc80211_simple.
2671  *
2672  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2673  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2674  *       which requires station table entry to exist).
2675  */
2676 static void rs_initialize_lq(struct iwl_mvm *mvm,
2677                              struct ieee80211_sta *sta,
2678                              struct iwl_lq_sta *lq_sta,
2679                              enum nl80211_band band)
2680 {
2681         struct iwl_scale_tbl_info *tbl;
2682         struct rs_rate *rate;
2683         u8 active_tbl = 0;
2684
2685         if (!sta || !lq_sta)
2686                 return;
2687
2688         if (!lq_sta->search_better_tbl)
2689                 active_tbl = lq_sta->active_tbl;
2690         else
2691                 active_tbl = rs_search_tbl(lq_sta->active_tbl);
2692
2693         tbl = &(lq_sta->lq_info[active_tbl]);
2694         rate = &tbl->rate;
2695
2696         rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2697         rs_init_optimal_rate(mvm, sta, lq_sta);
2698
2699         WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2700                   "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2701                   rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2702                   mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2703
2704         tbl->column = rs_get_column_from_rate(rate);
2705
2706         rs_set_expected_tpt_table(lq_sta, tbl);
2707         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2708         /* TODO restore station should remember the lq cmd */
2709         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
2710 }
2711
2712 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
2713                             void *mvm_sta,
2714                             struct ieee80211_tx_rate_control *txrc)
2715 {
2716         struct iwl_op_mode *op_mode = mvm_r;
2717         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2718         struct sk_buff *skb = txrc->skb;
2719         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2720         struct iwl_lq_sta *lq_sta;
2721         struct rs_rate *optimal_rate;
2722         u32 last_ucode_rate;
2723
2724         if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2725                 /* if vif isn't initialized mvm doesn't know about
2726                  * this station, so don't do anything with the it
2727                  */
2728                 sta = NULL;
2729                 mvm_sta = NULL;
2730         }
2731
2732         if (!mvm_sta)
2733                 return;
2734
2735         lq_sta = mvm_sta;
2736         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2737                                   info->band, &info->control.rates[0]);
2738         info->control.rates[0].count = 1;
2739
2740         /* Report the optimal rate based on rssi and STA caps if we haven't
2741          * converged yet (too little traffic) or exploring other modulations
2742          */
2743         if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2744                 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2745                 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2746                                                           optimal_rate);
2747                 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2748                                           &txrc->reported_rate);
2749         }
2750 }
2751
2752 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2753                               gfp_t gfp)
2754 {
2755         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2756         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2757         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2758         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2759
2760         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2761
2762         lq_sta->pers.drv = mvm;
2763 #ifdef CONFIG_MAC80211_DEBUGFS
2764         lq_sta->pers.dbg_fixed_rate = 0;
2765         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2766         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2767 #endif
2768         lq_sta->pers.chains = 0;
2769         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2770         lq_sta->pers.last_rssi = S8_MIN;
2771
2772         return lq_sta;
2773 }
2774
2775 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2776                                        int nss)
2777 {
2778         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2779                 (0x3 << (2 * (nss - 1)));
2780         rx_mcs >>= (2 * (nss - 1));
2781
2782         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2783                 return IWL_RATE_MCS_7_INDEX;
2784         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2785                 return IWL_RATE_MCS_8_INDEX;
2786         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2787                 return IWL_RATE_MCS_9_INDEX;
2788
2789         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2790         return -1;
2791 }
2792
2793 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2794                                      struct ieee80211_sta_vht_cap *vht_cap,
2795                                      struct iwl_lq_sta *lq_sta)
2796 {
2797         int i;
2798         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2799
2800         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2801                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2802                         if (i == IWL_RATE_9M_INDEX)
2803                                 continue;
2804
2805                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2806                         if (i == IWL_RATE_MCS_9_INDEX &&
2807                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2808                                 continue;
2809
2810                         lq_sta->active_siso_rate |= BIT(i);
2811                 }
2812         }
2813
2814         if (sta->rx_nss < 2)
2815                 return;
2816
2817         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2818         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2819                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2820                         if (i == IWL_RATE_9M_INDEX)
2821                                 continue;
2822
2823                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2824                         if (i == IWL_RATE_MCS_9_INDEX &&
2825                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2826                                 continue;
2827
2828                         lq_sta->active_mimo2_rate |= BIT(i);
2829                 }
2830         }
2831 }
2832
2833 static void rs_ht_init(struct iwl_mvm *mvm,
2834                        struct ieee80211_sta *sta,
2835                        struct iwl_lq_sta *lq_sta,
2836                        struct ieee80211_sta_ht_cap *ht_cap)
2837 {
2838         /* active_siso_rate mask includes 9 MBits (bit 5),
2839          * and CCK (bits 0-3), supp_rates[] does not;
2840          * shift to convert format, force 9 MBits off.
2841          */
2842         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2843         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2844         lq_sta->active_siso_rate &= ~((u16)0x2);
2845         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2846
2847         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2848         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2849         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2850         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2851
2852         if (mvm->cfg->ht_params->ldpc &&
2853             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2854                 lq_sta->ldpc = true;
2855
2856         if (mvm->cfg->ht_params->stbc &&
2857             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2858             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2859                 lq_sta->stbc_capable = true;
2860
2861         lq_sta->is_vht = false;
2862 }
2863
2864 static void rs_vht_init(struct iwl_mvm *mvm,
2865                         struct ieee80211_sta *sta,
2866                         struct iwl_lq_sta *lq_sta,
2867                         struct ieee80211_sta_vht_cap *vht_cap)
2868 {
2869         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2870
2871         if (mvm->cfg->ht_params->ldpc &&
2872             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2873                 lq_sta->ldpc = true;
2874
2875         if (mvm->cfg->ht_params->stbc &&
2876             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2877             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2878                 lq_sta->stbc_capable = true;
2879
2880         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2881             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2882             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2883                 lq_sta->bfer_capable = true;
2884
2885         lq_sta->is_vht = true;
2886 }
2887
2888 #ifdef CONFIG_IWLWIFI_DEBUGFS
2889 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2890 {
2891         spin_lock_bh(&mvm->drv_stats_lock);
2892         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2893         spin_unlock_bh(&mvm->drv_stats_lock);
2894 }
2895
2896 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2897 {
2898         u8 nss = 0;
2899
2900         spin_lock(&mvm->drv_stats_lock);
2901
2902         if (agg)
2903                 mvm->drv_rx_stats.agg_frames++;
2904
2905         mvm->drv_rx_stats.success_frames++;
2906
2907         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2908         case RATE_MCS_CHAN_WIDTH_20:
2909                 mvm->drv_rx_stats.bw_20_frames++;
2910                 break;
2911         case RATE_MCS_CHAN_WIDTH_40:
2912                 mvm->drv_rx_stats.bw_40_frames++;
2913                 break;
2914         case RATE_MCS_CHAN_WIDTH_80:
2915                 mvm->drv_rx_stats.bw_80_frames++;
2916                 break;
2917         case RATE_MCS_CHAN_WIDTH_160:
2918                 mvm->drv_rx_stats.bw_160_frames++;
2919                 break;
2920         default:
2921                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2922         }
2923
2924         if (rate & RATE_MCS_HT_MSK) {
2925                 mvm->drv_rx_stats.ht_frames++;
2926                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2927         } else if (rate & RATE_MCS_VHT_MSK) {
2928                 mvm->drv_rx_stats.vht_frames++;
2929                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2930                        RATE_VHT_MCS_NSS_POS) + 1;
2931         } else {
2932                 mvm->drv_rx_stats.legacy_frames++;
2933         }
2934
2935         if (nss == 1)
2936                 mvm->drv_rx_stats.siso_frames++;
2937         else if (nss == 2)
2938                 mvm->drv_rx_stats.mimo2_frames++;
2939
2940         if (rate & RATE_MCS_SGI_MSK)
2941                 mvm->drv_rx_stats.sgi_frames++;
2942         else
2943                 mvm->drv_rx_stats.ngi_frames++;
2944
2945         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2946         mvm->drv_rx_stats.last_frame_idx =
2947                 (mvm->drv_rx_stats.last_frame_idx + 1) %
2948                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2949
2950         spin_unlock(&mvm->drv_stats_lock);
2951 }
2952 #endif
2953
2954 /*
2955  * Called after adding a new station to initialize rate scaling
2956  */
2957 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2958                              enum nl80211_band band)
2959 {
2960         int i, j;
2961         struct ieee80211_hw *hw = mvm->hw;
2962         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2963         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2964         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2965         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2966         struct ieee80211_supported_band *sband;
2967         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2968
2969         lockdep_assert_held(&mvmsta->lq_sta.rs_drv.pers.lock);
2970
2971         /* clear all non-persistent lq data */
2972         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2973
2974         sband = hw->wiphy->bands[band];
2975
2976         lq_sta->lq.sta_id = mvmsta->sta_id;
2977         mvmsta->amsdu_enabled = 0;
2978         mvmsta->max_amsdu_len = sta->max_amsdu_len;
2979
2980         for (j = 0; j < LQ_SIZE; j++)
2981                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2982
2983         lq_sta->flush_timer = 0;
2984         lq_sta->last_tx = jiffies;
2985
2986         IWL_DEBUG_RATE(mvm,
2987                        "LQ: *** rate scale station global init for station %d ***\n",
2988                        mvmsta->sta_id);
2989         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2990          * the lowest or the highest rate.. Could consider using RSSI from
2991          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2992          * after assoc.. */
2993
2994         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2995         lq_sta->band = sband->band;
2996         /*
2997          * active legacy rates as per supported rates bitmap
2998          */
2999         supp = sta->supp_rates[sband->band];
3000         lq_sta->active_legacy_rate = 0;
3001         for_each_set_bit(i, &supp, BITS_PER_LONG)
3002                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3003
3004         /* TODO: should probably account for rx_highest for both HT/VHT */
3005         if (!vht_cap || !vht_cap->vht_supported)
3006                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3007         else
3008                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3009
3010         lq_sta->max_legacy_rate_idx =
3011                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3012         lq_sta->max_siso_rate_idx =
3013                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3014         lq_sta->max_mimo2_rate_idx =
3015                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3016
3017         IWL_DEBUG_RATE(mvm,
3018                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3019                        lq_sta->active_legacy_rate,
3020                        lq_sta->active_siso_rate,
3021                        lq_sta->active_mimo2_rate,
3022                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3023                        lq_sta->bfer_capable);
3024         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3025                        lq_sta->max_legacy_rate_idx,
3026                        lq_sta->max_siso_rate_idx,
3027                        lq_sta->max_mimo2_rate_idx);
3028
3029         /* These values will be overridden later */
3030         lq_sta->lq.single_stream_ant_msk =
3031                 iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm));
3032         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3033
3034         /* as default allow aggregation for all tids */
3035         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3036         lq_sta->is_agg = 0;
3037 #ifdef CONFIG_IWLWIFI_DEBUGFS
3038         iwl_mvm_reset_frame_stats(mvm);
3039 #endif
3040         rs_initialize_lq(mvm, sta, lq_sta, band);
3041 }
3042
3043 static void rs_drv_rate_update(void *mvm_r,
3044                                struct ieee80211_supported_band *sband,
3045                                struct cfg80211_chan_def *chandef,
3046                                struct ieee80211_sta *sta,
3047                                void *priv_sta, u32 changed)
3048 {
3049         struct iwl_op_mode *op_mode = mvm_r;
3050         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3051         u8 tid;
3052
3053         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3054                 return;
3055
3056         /* Stop any ongoing aggregations as rs starts off assuming no agg */
3057         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3058                 ieee80211_stop_tx_ba_session(sta, tid);
3059
3060         iwl_mvm_rs_rate_init(mvm, sta, sband->band, true);
3061 }
3062
3063 static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
3064                                    struct ieee80211_sta *sta,
3065                                    int tid, struct ieee80211_tx_info *info,
3066                                    bool ndp)
3067 {
3068         int legacy_success;
3069         int retries;
3070         int i;
3071         struct iwl_lq_cmd *table;
3072         u32 lq_hwrate;
3073         struct rs_rate lq_rate, tx_resp_rate;
3074         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
3075         u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
3076         u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
3077         u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
3078         u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
3079         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3080         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
3081
3082         /* Treat uninitialized rate scaling data same as non-existing. */
3083         if (!lq_sta) {
3084                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
3085                 return;
3086         } else if (!lq_sta->pers.drv) {
3087                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
3088                 return;
3089         }
3090
3091         /* This packet was aggregated but doesn't carry status info */
3092         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
3093             !(info->flags & IEEE80211_TX_STAT_AMPDU))
3094                 return;
3095
3096         if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
3097                                     &tx_resp_rate)) {
3098                 WARN_ON_ONCE(1);
3099                 return;
3100         }
3101
3102 #ifdef CONFIG_MAC80211_DEBUGFS
3103         /* Disable last tx check if we are debugging with fixed rate but
3104          * update tx stats
3105          */
3106         if (lq_sta->pers.dbg_fixed_rate) {
3107                 int index = tx_resp_rate.index;
3108                 enum rs_column column;
3109                 int attempts, success;
3110
3111                 column = rs_get_column_from_rate(&tx_resp_rate);
3112                 if (WARN_ONCE(column == RS_COLUMN_INVALID,
3113                               "Can't map rate 0x%x to column",
3114                               tx_resp_hwrate))
3115                         return;
3116
3117                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3118                         attempts = info->status.ampdu_len;
3119                         success = info->status.ampdu_ack_len;
3120                 } else {
3121                         attempts = info->status.rates[0].count;
3122                         success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3123                 }
3124
3125                 lq_sta->pers.tx_stats[column][index].total += attempts;
3126                 lq_sta->pers.tx_stats[column][index].success += success;
3127
3128                 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
3129                                tx_resp_hwrate, success, attempts);
3130                 return;
3131         }
3132 #endif
3133
3134         if (time_after(jiffies,
3135                        (unsigned long)(lq_sta->last_tx +
3136                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
3137                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
3138                 /* reach here only in case of driver RS, call directly
3139                  * the unlocked version
3140                  */
3141                 rs_drv_rate_init(mvm, sta, info->band);
3142                 return;
3143         }
3144         lq_sta->last_tx = jiffies;
3145
3146         /* Ignore this Tx frame response if its initial rate doesn't match
3147          * that of latest Link Quality command.  There may be stragglers
3148          * from a previous Link Quality command, but we're no longer interested
3149          * in those; they're either from the "active" mode while we're trying
3150          * to check "search" mode, or a prior "search" mode after we've moved
3151          * to a new "search" mode (which might become the new "active" mode).
3152          */
3153         table = &lq_sta->lq;
3154         lq_hwrate = le32_to_cpu(table->rs_table[0]);
3155         if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
3156                 WARN_ON_ONCE(1);
3157                 return;
3158         }
3159
3160         /* Here we actually compare this rate to the latest LQ command */
3161         if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
3162                 IWL_DEBUG_RATE(mvm,
3163                                "tx resp color 0x%x does not match 0x%x\n",
3164                                lq_color, LQ_FLAG_COLOR_GET(table->flags));
3165
3166                 /* Since rates mis-match, the last LQ command may have failed.
3167                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
3168                  * ... driver.
3169                  */
3170                 lq_sta->missed_rate_counter++;
3171                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
3172                         lq_sta->missed_rate_counter = 0;
3173                         IWL_DEBUG_RATE(mvm,
3174                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
3175                                        lq_sta->rs_state);
3176                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
3177                 }
3178                 /* Regardless, ignore this status info for outdated rate */
3179                 return;
3180         }
3181
3182         /* Rate did match, so reset the missed_rate_counter */
3183         lq_sta->missed_rate_counter = 0;
3184
3185         if (!lq_sta->search_better_tbl) {
3186                 curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3187                 other_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3188         } else {
3189                 curr_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3190                 other_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3191         }
3192
3193         if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
3194                 IWL_DEBUG_RATE(mvm,
3195                                "Neither active nor search matches tx rate\n");
3196                 tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3197                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
3198                 tmp_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3199                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
3200                 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
3201
3202                 /* no matching table found, let's by-pass the data collection
3203                  * and continue to perform rate scale to find the rate table
3204                  */
3205                 rs_stay_in_table(lq_sta, true);
3206                 goto done;
3207         }
3208
3209         /* Updating the frame history depends on whether packets were
3210          * aggregated.
3211          *
3212          * For aggregation, all packets were transmitted at the same rate, the
3213          * first index into rate scale table.
3214          */
3215         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3216                 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
3217                                     info->status.ampdu_len,
3218                                     info->status.ampdu_ack_len,
3219                                     reduced_txp);
3220
3221                 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
3222                  * it as a single frame loss as we don't want the success ratio
3223                  * to dip too quickly because a BA wasn't received.
3224                  * For TPC, there's no need for this optimisation since we want
3225                  * to recover very quickly from a bad power reduction and,
3226                  * therefore we'd like the success ratio to get an immediate hit
3227                  * when failing to get a BA, so we'd switch back to a lower or
3228                  * zero power reduction. When FW transmits agg with a rate
3229                  * different from the initial rate, it will not use reduced txp
3230                  * and will send BA notification twice (one empty with reduced
3231                  * txp equal to the value from LQ and one with reduced txp 0).
3232                  * We need to update counters for each txp level accordingly.
3233                  */
3234                 if (info->status.ampdu_ack_len == 0)
3235                         info->status.ampdu_len = 1;
3236
3237                 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl,
3238                                     tx_resp_rate.index,
3239                                     info->status.ampdu_len,
3240                                     info->status.ampdu_ack_len);
3241
3242                 /* Update success/fail counts if not searching for new mode */
3243                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3244                         lq_sta->total_success += info->status.ampdu_ack_len;
3245                         lq_sta->total_failed += (info->status.ampdu_len -
3246                                         info->status.ampdu_ack_len);
3247                 }
3248         } else {
3249                 /* For legacy, update frame history with for each Tx retry. */
3250                 retries = info->status.rates[0].count - 1;
3251                 /* HW doesn't send more than 15 retries */
3252                 retries = min(retries, 15);
3253
3254                 /* The last transmission may have been successful */
3255                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3256                 /* Collect data for each rate used during failed TX attempts */
3257                 for (i = 0; i <= retries; ++i) {
3258                         lq_hwrate = le32_to_cpu(table->rs_table[i]);
3259                         if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
3260                                                     &lq_rate)) {
3261                                 WARN_ON_ONCE(1);
3262                                 return;
3263                         }
3264
3265                         /* Only collect stats if retried rate is in the same RS
3266                          * table as active/search.
3267                          */
3268                         if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
3269                                 tmp_tbl = curr_tbl;
3270                         else if (rs_rate_column_match(&lq_rate,
3271                                                       &other_tbl->rate))
3272                                 tmp_tbl = other_tbl;
3273                         else
3274                                 continue;
3275
3276                         rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
3277                                             tx_resp_rate.index, 1,
3278                                             i < retries ? 0 : legacy_success,
3279                                             reduced_txp);
3280                         rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
3281                                             tx_resp_rate.index, 1,
3282                                             i < retries ? 0 : legacy_success);
3283                 }
3284
3285                 /* Update success/fail counts if not searching for new mode */
3286                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3287                         lq_sta->total_success += legacy_success;
3288                         lq_sta->total_failed += retries + (1 - legacy_success);
3289                 }
3290         }
3291         /* The last TX rate is cached in lq_sta; it's set in if/else above */
3292         lq_sta->last_rate_n_flags = lq_hwrate;
3293         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
3294 done:
3295         /* See if there's a better rate or modulation mode to try. */
3296         if (sta->supp_rates[info->band])
3297                 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
3298 }
3299
3300 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3301                           int tid, struct ieee80211_tx_info *info, bool ndp)
3302 {
3303         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3304
3305         /* If it's locked we are in middle of init flow
3306          * just wait for next tx status to update the lq_sta data
3307          */
3308         if (!spin_trylock(&mvmsta->lq_sta.rs_drv.pers.lock))
3309                 return;
3310
3311         __iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp);
3312         spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock);
3313 }
3314
3315 #ifdef CONFIG_MAC80211_DEBUGFS
3316 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3317                                             struct iwl_lq_cmd *lq_cmd,
3318                                             enum nl80211_band band,
3319                                             u32 ucode_rate)
3320 {
3321         struct rs_rate rate;
3322         int i;
3323         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3324         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3325         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3326
3327         for (i = 0; i < num_rates; i++)
3328                 lq_cmd->rs_table[i] = ucode_rate_le32;
3329
3330         if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3331                 WARN_ON_ONCE(1);
3332                 return;
3333         }
3334
3335         if (is_mimo(&rate))
3336                 lq_cmd->mimo_delim = num_rates - 1;
3337         else
3338                 lq_cmd->mimo_delim = 0;
3339
3340         lq_cmd->reduced_tpc = 0;
3341
3342         if (num_of_ant(ant) == 1)
3343                 lq_cmd->single_stream_ant_msk = ant;
3344
3345         if (!mvm->trans->cfg->gen2)
3346                 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3347         else
3348                 lq_cmd->agg_frame_cnt_limit =
3349                         LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3350 }
3351 #endif /* CONFIG_MAC80211_DEBUGFS */
3352
3353 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3354                                      struct iwl_lq_sta *lq_sta,
3355                                      struct rs_rate *rate,
3356                                      __le32 *rs_table, int *rs_table_index,
3357                                      int num_rates, int num_retries,
3358                                      u8 valid_tx_ant, bool toggle_ant)
3359 {
3360         int i, j;
3361         __le32 ucode_rate;
3362         bool bottom_reached = false;
3363         int prev_rate_idx = rate->index;
3364         int end = LINK_QUAL_MAX_RETRY_NUM;
3365         int index = *rs_table_index;
3366
3367         for (i = 0; i < num_rates && index < end; i++) {
3368                 for (j = 0; j < num_retries && index < end; j++, index++) {
3369                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3370                                                                          rate));
3371                         rs_table[index] = ucode_rate;
3372                         if (toggle_ant)
3373                                 rs_toggle_antenna(valid_tx_ant, rate);
3374                 }
3375
3376                 prev_rate_idx = rate->index;
3377                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3378                 if (bottom_reached && !is_legacy(rate))
3379                         break;
3380         }
3381
3382         if (!bottom_reached && !is_legacy(rate))
3383                 rate->index = prev_rate_idx;
3384
3385         *rs_table_index = index;
3386 }
3387
3388 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3389  * column the rate table should look like this:
3390  *
3391  * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3392  * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3393  * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3394  * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3395  * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3396  * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3397  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3398  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3399  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3400  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3401  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3402  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3403  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3404  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3405  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3406  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3407  */
3408 static void rs_build_rates_table(struct iwl_mvm *mvm,
3409                                  struct ieee80211_sta *sta,
3410                                  struct iwl_lq_sta *lq_sta,
3411                                  const struct rs_rate *initial_rate)
3412 {
3413         struct rs_rate rate;
3414         int num_rates, num_retries, index = 0;
3415         u8 valid_tx_ant = 0;
3416         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3417         bool toggle_ant = false;
3418         u32 color;
3419
3420         memcpy(&rate, initial_rate, sizeof(rate));
3421
3422         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3423
3424         /* TODO: remove old API when min FW API hits 14 */
3425         if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3426             rs_stbc_allow(mvm, sta, lq_sta))
3427                 rate.stbc = true;
3428
3429         if (is_siso(&rate)) {
3430                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3431                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3432         } else if (is_mimo(&rate)) {
3433                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3434                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3435         } else {
3436                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3437                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3438                 toggle_ant = true;
3439         }
3440
3441         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3442                                  num_rates, num_retries, valid_tx_ant,
3443                                  toggle_ant);
3444
3445         rs_get_lower_rate_down_column(lq_sta, &rate);
3446
3447         if (is_siso(&rate)) {
3448                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3449                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3450                 lq_cmd->mimo_delim = index;
3451         } else if (is_legacy(&rate)) {
3452                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3453                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3454         } else {
3455                 WARN_ON_ONCE(1);
3456         }
3457
3458         toggle_ant = true;
3459
3460         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3461                                  num_rates, num_retries, valid_tx_ant,
3462                                  toggle_ant);
3463
3464         rs_get_lower_rate_down_column(lq_sta, &rate);
3465
3466         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3467         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3468
3469         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3470                                  num_rates, num_retries, valid_tx_ant,
3471                                  toggle_ant);
3472
3473         /* update the color of the LQ command (as a counter at bits 1-3) */
3474         color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3475         lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3476 }
3477
3478 struct rs_bfer_active_iter_data {
3479         struct ieee80211_sta *exclude_sta;
3480         struct iwl_mvm_sta *bfer_mvmsta;
3481 };
3482
3483 static void rs_bfer_active_iter(void *_data,
3484                                 struct ieee80211_sta *sta)
3485 {
3486         struct rs_bfer_active_iter_data *data = _data;
3487         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3488         struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq;
3489         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3490
3491         if (sta == data->exclude_sta)
3492                 return;
3493
3494         /* The current sta has BFER allowed */
3495         if (ss_params & LQ_SS_BFER_ALLOWED) {
3496                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3497
3498                 data->bfer_mvmsta = mvmsta;
3499         }
3500 }
3501
3502 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3503 {
3504         int prio = -1;
3505         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3506
3507         switch (viftype) {
3508         case NL80211_IFTYPE_AP:
3509         case NL80211_IFTYPE_P2P_GO:
3510                 prio = 3;
3511                 break;
3512         case NL80211_IFTYPE_P2P_CLIENT:
3513                 prio = 2;
3514                 break;
3515         case NL80211_IFTYPE_STATION:
3516                 prio = 1;
3517                 break;
3518         default:
3519                 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3520                 prio = -1;
3521         }
3522
3523         return prio;
3524 }
3525
3526 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3527 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3528                                 struct iwl_mvm_sta *sta2)
3529 {
3530         int prio1 = rs_bfer_priority(sta1);
3531         int prio2 = rs_bfer_priority(sta2);
3532
3533         if (prio1 > prio2)
3534                 return 1;
3535         if (prio1 < prio2)
3536                 return -1;
3537         return 0;
3538 }
3539
3540 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3541                                 struct ieee80211_sta *sta,
3542                                 struct iwl_lq_sta *lq_sta,
3543                                 const struct rs_rate *initial_rate)
3544 {
3545         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3546         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3547         struct rs_bfer_active_iter_data data = {
3548                 .exclude_sta = sta,
3549                 .bfer_mvmsta = NULL,
3550         };
3551         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3552         u32 ss_params = LQ_SS_PARAMS_VALID;
3553
3554         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3555                 goto out;
3556
3557 #ifdef CONFIG_MAC80211_DEBUGFS
3558         /* Check if forcing the decision is configured.
3559          * Note that SISO is forced by not allowing STBC or BFER
3560          */
3561         if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3562                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3563         else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3564                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3565
3566         if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3567                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3568                                lq_sta->pers.ss_force);
3569                 goto out;
3570         }
3571 #endif
3572
3573         if (lq_sta->stbc_capable)
3574                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3575
3576         if (!lq_sta->bfer_capable)
3577                 goto out;
3578
3579         ieee80211_iterate_stations_atomic(mvm->hw,
3580                                           rs_bfer_active_iter,
3581                                           &data);
3582         bfer_mvmsta = data.bfer_mvmsta;
3583
3584         /* This code is safe as it doesn't run concurrently for different
3585          * stations. This is guaranteed by the fact that calls to
3586          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3587          */
3588         if (!bfer_mvmsta) {
3589                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3590
3591                 ss_params |= LQ_SS_BFER_ALLOWED;
3592                 goto out;
3593         }
3594
3595         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3596                        bfer_mvmsta->sta_id);
3597
3598         /* Disallow BFER on another STA if active and we're a higher priority */
3599         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3600                 struct iwl_lq_cmd *bfersta_lq_cmd =
3601                         &bfer_mvmsta->lq_sta.rs_drv.lq;
3602                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3603
3604                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3605                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3606                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd);
3607
3608                 ss_params |= LQ_SS_BFER_ALLOWED;
3609                 IWL_DEBUG_RATE(mvm,
3610                                "Lower priority BFER sta found (%d). Switch BFER\n",
3611                                bfer_mvmsta->sta_id);
3612         }
3613 out:
3614         lq_cmd->ss_params = cpu_to_le32(ss_params);
3615 }
3616
3617 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3618                            struct ieee80211_sta *sta,
3619                            struct iwl_lq_sta *lq_sta,
3620                            const struct rs_rate *initial_rate)
3621 {
3622         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3623         struct iwl_mvm_sta *mvmsta;
3624         struct iwl_mvm_vif *mvmvif;
3625
3626         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3627         lq_cmd->agg_time_limit =
3628                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3629
3630 #ifdef CONFIG_MAC80211_DEBUGFS
3631         if (lq_sta->pers.dbg_fixed_rate) {
3632                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3633                                                 lq_sta->band,
3634                                                 lq_sta->pers.dbg_fixed_rate);
3635                 return;
3636         }
3637 #endif
3638         if (WARN_ON_ONCE(!sta || !initial_rate))
3639                 return;
3640
3641         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3642
3643         if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3644                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3645
3646         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3647         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3648
3649         if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) &&
3650             num_of_ant(initial_rate->ant) == 1)
3651                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3652
3653         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3654
3655         /*
3656          * In case of low latency, tell the firmware to leave a frame in the
3657          * Tx Fifo so that it can start a transaction in the same TxOP. This
3658          * basically allows the firmware to send bursts.
3659          */
3660         if (iwl_mvm_vif_low_latency(mvmvif))
3661                 lq_cmd->agg_frame_cnt_limit--;
3662
3663         if (mvmsta->vif->p2p)
3664                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3665
3666         lq_cmd->agg_time_limit =
3667                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3668 }
3669
3670 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3671 {
3672         return hw->priv;
3673 }
3674
3675 /* rate scale requires free function to be implemented */
3676 static void rs_free(void *mvm_rate)
3677 {
3678         return;
3679 }
3680
3681 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
3682 {
3683         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3684         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3685
3686         IWL_DEBUG_RATE(mvm, "enter\n");
3687         IWL_DEBUG_RATE(mvm, "leave\n");
3688 }
3689
3690 #ifdef CONFIG_MAC80211_DEBUGFS
3691 int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate)
3692 {
3693
3694         char *type, *bw;
3695         u8 mcs = 0, nss = 0;
3696         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3697
3698         if (!(rate & RATE_MCS_HT_MSK) &&
3699             !(rate & RATE_MCS_VHT_MSK) &&
3700             !(rate & RATE_MCS_HE_MSK)) {
3701                 int index = iwl_hwrate_to_plcp_idx(rate);
3702
3703                 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps\n",
3704                                  rs_pretty_ant(ant),
3705                                  index == IWL_RATE_INVALID ? "BAD" :
3706                                  iwl_rate_mcs[index].mbps);
3707         }
3708
3709         if (rate & RATE_MCS_VHT_MSK) {
3710                 type = "VHT";
3711                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3712                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3713                        >> RATE_VHT_MCS_NSS_POS) + 1;
3714         } else if (rate & RATE_MCS_HT_MSK) {
3715                 type = "HT";
3716                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3717                 nss = ((rate & RATE_HT_MCS_NSS_MSK)
3718                        >> RATE_HT_MCS_NSS_POS) + 1;
3719         } else if (rate & RATE_MCS_HE_MSK) {
3720                 type = "HE";
3721                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3722                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3723                        >> RATE_VHT_MCS_NSS_POS) + 1;
3724         } else {
3725                 type = "Unknown"; /* shouldn't happen */
3726         }
3727
3728         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3729         case RATE_MCS_CHAN_WIDTH_20:
3730                 bw = "20Mhz";
3731                 break;
3732         case RATE_MCS_CHAN_WIDTH_40:
3733                 bw = "40Mhz";
3734                 break;
3735         case RATE_MCS_CHAN_WIDTH_80:
3736                 bw = "80Mhz";
3737                 break;
3738         case RATE_MCS_CHAN_WIDTH_160:
3739                 bw = "160Mhz";
3740                 break;
3741         default:
3742                 bw = "BAD BW";
3743         }
3744
3745         return scnprintf(buf, bufsz,
3746                          "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n",
3747                          type, rs_pretty_ant(ant), bw, mcs, nss,
3748                          (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3749                          (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3750                          (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3751                          (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3752 }
3753
3754 /**
3755  * Program the device to use fixed rate for frame transmit
3756  * This is for debugging/testing only
3757  * once the device start use fixed rate, we need to reload the module
3758  * to being back the normal operation.
3759  */
3760 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3761                                 struct iwl_lq_sta *lq_sta)
3762 {
3763         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3764         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3765         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3766
3767         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3768                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3769
3770         if (lq_sta->pers.dbg_fixed_rate) {
3771                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3772                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq);
3773         }
3774 }
3775
3776 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3777                         const char __user *user_buf, size_t count, loff_t *ppos)
3778 {
3779         struct iwl_lq_sta *lq_sta = file->private_data;
3780         struct iwl_mvm *mvm;
3781         char buf[64];
3782         size_t buf_size;
3783         u32 parsed_rate;
3784
3785         mvm = lq_sta->pers.drv;
3786         memset(buf, 0, sizeof(buf));
3787         buf_size = min(count, sizeof(buf) -  1);
3788         if (copy_from_user(buf, user_buf, buf_size))
3789                 return -EFAULT;
3790
3791         if (sscanf(buf, "%x", &parsed_rate) == 1)
3792                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3793         else
3794                 lq_sta->pers.dbg_fixed_rate = 0;
3795
3796         rs_program_fix_rate(mvm, lq_sta);
3797
3798         return count;
3799 }
3800
3801 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3802                         char __user *user_buf, size_t count, loff_t *ppos)
3803 {
3804         char *buff;
3805         int desc = 0;
3806         int i = 0;
3807         ssize_t ret;
3808         static const size_t bufsz = 2048;
3809
3810         struct iwl_lq_sta *lq_sta = file->private_data;
3811         struct iwl_mvm_sta *mvmsta =
3812                 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
3813         struct iwl_mvm *mvm;
3814         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3815         struct rs_rate *rate = &tbl->rate;
3816         u32 ss_params;
3817
3818         mvm = lq_sta->pers.drv;
3819         buff = kmalloc(bufsz, GFP_KERNEL);
3820         if (!buff)
3821                 return -ENOMEM;
3822
3823         desc += scnprintf(buff + desc, bufsz - desc,
3824                           "sta_id %d\n", lq_sta->lq.sta_id);
3825         desc += scnprintf(buff + desc, bufsz - desc,
3826                           "failed=%d success=%d rate=0%lX\n",
3827                           lq_sta->total_failed, lq_sta->total_success,
3828                           lq_sta->active_legacy_rate);
3829         desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
3830                           lq_sta->pers.dbg_fixed_rate);
3831         desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n",
3832             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3833             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3834             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3835         desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
3836                           (is_legacy(rate)) ? "legacy" :
3837                           is_vht(rate) ? "VHT" : "HT");
3838         if (!is_legacy(rate)) {
3839                 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3840                    (is_siso(rate)) ? "SISO" : "MIMO2");
3841                 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3842                                 (is_ht20(rate)) ? "20MHz" :
3843                                 (is_ht40(rate)) ? "40MHz" :
3844                                 (is_ht80(rate)) ? "80MHz" :
3845                                 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3846                 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
3847                                 (rate->sgi) ? "SGI" : "NGI",
3848                                 (rate->ldpc) ? "LDPC" : "BCC",
3849                                 (lq_sta->is_agg) ? "AGG on" : "",
3850                                 (mvmsta->amsdu_enabled) ? "AMSDU on" : "");
3851         }
3852         desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
3853                         lq_sta->last_rate_n_flags);
3854         desc += scnprintf(buff + desc, bufsz - desc,
3855                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3856                         lq_sta->lq.flags,
3857                         lq_sta->lq.mimo_delim,
3858                         lq_sta->lq.single_stream_ant_msk,
3859                         lq_sta->lq.dual_stream_ant_msk);
3860
3861         desc += scnprintf(buff + desc, bufsz - desc,
3862                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3863                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3864                         lq_sta->lq.agg_disable_start_th,
3865                         lq_sta->lq.agg_frame_cnt_limit);
3866
3867         desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
3868                           lq_sta->lq.reduced_tpc);
3869         ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3870         desc += scnprintf(buff + desc, bufsz - desc,
3871                         "single stream params: %s%s%s%s\n",
3872                         (ss_params & LQ_SS_PARAMS_VALID) ?
3873                         "VALID" : "INVALID",
3874                         (ss_params & LQ_SS_BFER_ALLOWED) ?
3875                         ", BFER" : "",
3876                         (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3877                         ", STBC" : "",
3878                         (ss_params & LQ_SS_FORCE) ?
3879                         ", FORCE" : "");
3880         desc += scnprintf(buff + desc, bufsz - desc,
3881                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3882                         lq_sta->lq.initial_rate_index[0],
3883                         lq_sta->lq.initial_rate_index[1],
3884                         lq_sta->lq.initial_rate_index[2],
3885                         lq_sta->lq.initial_rate_index[3]);
3886
3887         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3888                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3889
3890                 desc += scnprintf(buff + desc, bufsz - desc,
3891                                   " rate[%d] 0x%X ", i, r);
3892                 desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r);
3893         }
3894
3895         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3896         kfree(buff);
3897         return ret;
3898 }
3899
3900 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3901         .write = rs_sta_dbgfs_scale_table_write,
3902         .read = rs_sta_dbgfs_scale_table_read,
3903         .open = simple_open,
3904         .llseek = default_llseek,
3905 };
3906 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3907                         char __user *user_buf, size_t count, loff_t *ppos)
3908 {
3909         char *buff;
3910         int desc = 0;
3911         int i, j;
3912         ssize_t ret;
3913         struct iwl_scale_tbl_info *tbl;
3914         struct rs_rate *rate;
3915         struct iwl_lq_sta *lq_sta = file->private_data;
3916
3917         buff = kmalloc(1024, GFP_KERNEL);
3918         if (!buff)
3919                 return -ENOMEM;
3920
3921         for (i = 0; i < LQ_SIZE; i++) {
3922                 tbl = &(lq_sta->lq_info[i]);
3923                 rate = &tbl->rate;
3924                 desc += sprintf(buff+desc,
3925                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3926                                 "index=%d\n",
3927                                 lq_sta->active_tbl == i ? "*" : "x",
3928                                 rate->type,
3929                                 rate->sgi,
3930                                 is_ht20(rate) ? "20MHz" :
3931                                 is_ht40(rate) ? "40MHz" :
3932                                 is_ht80(rate) ? "80MHz" :
3933                                 is_ht160(rate) ? "160MHz" : "ERR",
3934                                 rate->index);
3935                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3936                         desc += sprintf(buff+desc,
3937                                 "counter=%d success=%d %%=%d\n",
3938                                 tbl->win[j].counter,
3939                                 tbl->win[j].success_counter,
3940                                 tbl->win[j].success_ratio);
3941                 }
3942         }
3943         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3944         kfree(buff);
3945         return ret;
3946 }
3947
3948 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3949         .read = rs_sta_dbgfs_stats_table_read,
3950         .open = simple_open,
3951         .llseek = default_llseek,
3952 };
3953
3954 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3955                                               char __user *user_buf,
3956                                               size_t count, loff_t *ppos)
3957 {
3958         static const char * const column_name[] = {
3959                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3960                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3961                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3962                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3963                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3964                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3965                 [RS_COLUMN_MIMO2] = "MIMO2",
3966                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3967         };
3968
3969         static const char * const rate_name[] = {
3970                 [IWL_RATE_1M_INDEX] = "1M",
3971                 [IWL_RATE_2M_INDEX] = "2M",
3972                 [IWL_RATE_5M_INDEX] = "5.5M",
3973                 [IWL_RATE_11M_INDEX] = "11M",
3974                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3975                 [IWL_RATE_9M_INDEX] = "9M",
3976                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3977                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3978                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3979                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3980                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3981                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3982                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3983                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3984                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3985                 [IWL_RATE_MCS_10_INDEX] = "MCS10",
3986                 [IWL_RATE_MCS_11_INDEX] = "MCS11",
3987         };
3988
3989         char *buff, *pos, *endpos;
3990         int col, rate;
3991         ssize_t ret;
3992         struct iwl_lq_sta *lq_sta = file->private_data;
3993         struct rs_rate_stats *stats;
3994         static const size_t bufsz = 1024;
3995
3996         buff = kmalloc(bufsz, GFP_KERNEL);
3997         if (!buff)
3998                 return -ENOMEM;
3999
4000         pos = buff;
4001         endpos = pos + bufsz;
4002
4003         pos += scnprintf(pos, endpos - pos, "COLUMN,");
4004         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
4005                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
4006         pos += scnprintf(pos, endpos - pos, "\n");
4007
4008         for (col = 0; col < RS_COLUMN_COUNT; col++) {
4009                 pos += scnprintf(pos, endpos - pos,
4010                                  "%s,", column_name[col]);
4011
4012                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
4013                         stats = &(lq_sta->pers.tx_stats[col][rate]);
4014                         pos += scnprintf(pos, endpos - pos,
4015                                          "%llu/%llu,",
4016                                          stats->success,
4017                                          stats->total);
4018                 }
4019                 pos += scnprintf(pos, endpos - pos, "\n");
4020         }
4021
4022         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
4023         kfree(buff);
4024         return ret;
4025 }
4026
4027 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
4028                                                const char __user *user_buf,
4029                                                size_t count, loff_t *ppos)
4030 {
4031         struct iwl_lq_sta *lq_sta = file->private_data;
4032         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
4033
4034         return count;
4035 }
4036
4037 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
4038         .read = rs_sta_dbgfs_drv_tx_stats_read,
4039         .write = rs_sta_dbgfs_drv_tx_stats_write,
4040         .open = simple_open,
4041         .llseek = default_llseek,
4042 };
4043
4044 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
4045                                        char __user *user_buf,
4046                                        size_t count, loff_t *ppos)
4047 {
4048         struct iwl_lq_sta *lq_sta = file->private_data;
4049         char buf[12];
4050         int bufsz = sizeof(buf);
4051         int pos = 0;
4052         static const char * const ss_force_name[] = {
4053                 [RS_SS_FORCE_NONE] = "none",
4054                 [RS_SS_FORCE_STBC] = "stbc",
4055                 [RS_SS_FORCE_BFER] = "bfer",
4056                 [RS_SS_FORCE_SISO] = "siso",
4057         };
4058
4059         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
4060                          ss_force_name[lq_sta->pers.ss_force]);
4061         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
4062 }
4063
4064 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
4065                                         size_t count, loff_t *ppos)
4066 {
4067         struct iwl_mvm *mvm = lq_sta->pers.drv;
4068         int ret = 0;
4069
4070         if (!strncmp("none", buf, 4)) {
4071                 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
4072         } else if (!strncmp("siso", buf, 4)) {
4073                 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
4074         } else if (!strncmp("stbc", buf, 4)) {
4075                 if (lq_sta->stbc_capable) {
4076                         lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
4077                 } else {
4078                         IWL_ERR(mvm,
4079                                 "can't force STBC. peer doesn't support\n");
4080                         ret = -EINVAL;
4081                 }
4082         } else if (!strncmp("bfer", buf, 4)) {
4083                 if (lq_sta->bfer_capable) {
4084                         lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4085                 } else {
4086                         IWL_ERR(mvm,
4087                                 "can't force BFER. peer doesn't support\n");
4088                         ret = -EINVAL;
4089                 }
4090         } else {
4091                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4092                 ret = -EINVAL;
4093         }
4094         return ret ?: count;
4095 }
4096
4097 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4098         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4099 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
4100                 debugfs_create_file(#name, mode, parent, lq_sta,        \
4101                                     &iwl_dbgfs_##name##_ops);           \
4102         } while (0)
4103
4104 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4105
4106 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
4107                                    struct dentry *dir)
4108 {
4109         struct iwl_lq_sta *lq_sta = priv_sta;
4110         struct iwl_mvm_sta *mvmsta;
4111
4112         mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
4113
4114         if (!mvmsta->vif)
4115                 return;
4116
4117         debugfs_create_file("rate_scale_table", 0600, dir,
4118                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
4119         debugfs_create_file("rate_stats_table", 0400, dir,
4120                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
4121         debugfs_create_file("drv_tx_stats", 0600, dir,
4122                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4123         debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
4124                           &lq_sta->tx_agg_tid_en);
4125         debugfs_create_u8("reduced_tpc", 0600, dir,
4126                           &lq_sta->pers.dbg_fixed_txp_reduction);
4127
4128         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
4129 }
4130
4131 void rs_remove_sta_debugfs(void *mvm, void *mvm_sta)
4132 {
4133 }
4134 #endif
4135
4136 /*
4137  * Initialization of rate scaling information is done by driver after
4138  * the station is added. Since mac80211 calls this function before a
4139  * station is added we ignore it.
4140  */
4141 static void rs_rate_init_ops(void *mvm_r,
4142                              struct ieee80211_supported_band *sband,
4143                              struct cfg80211_chan_def *chandef,
4144                              struct ieee80211_sta *sta, void *mvm_sta)
4145 {
4146 }
4147
4148 /* ops for rate scaling implemented in the driver */
4149 static const struct rate_control_ops rs_mvm_ops_drv = {
4150         .name = RS_NAME,
4151         .tx_status = rs_drv_mac80211_tx_status,
4152         .get_rate = rs_drv_get_rate,
4153         .rate_init = rs_rate_init_ops,
4154         .alloc = rs_alloc,
4155         .free = rs_free,
4156         .alloc_sta = rs_drv_alloc_sta,
4157         .free_sta = rs_free_sta,
4158         .rate_update = rs_drv_rate_update,
4159 #ifdef CONFIG_MAC80211_DEBUGFS
4160         .add_sta_debugfs = rs_drv_add_sta_debugfs,
4161         .remove_sta_debugfs = rs_remove_sta_debugfs,
4162 #endif
4163         .capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW,
4164 };
4165
4166 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
4167                           enum nl80211_band band, bool update)
4168 {
4169         if (iwl_mvm_has_tlc_offload(mvm)) {
4170                 rs_fw_rate_init(mvm, sta, band, update);
4171         } else {
4172                 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
4173
4174                 spin_lock(&mvmsta->lq_sta.rs_drv.pers.lock);
4175                 rs_drv_rate_init(mvm, sta, band);
4176                 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock);
4177         }
4178 }
4179
4180 int iwl_mvm_rate_control_register(void)
4181 {
4182         return ieee80211_rate_control_register(&rs_mvm_ops_drv);
4183 }
4184
4185 void iwl_mvm_rate_control_unregister(void)
4186 {
4187         ieee80211_rate_control_unregister(&rs_mvm_ops_drv);
4188 }
4189
4190 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4191                                 bool enable)
4192 {
4193         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq;
4194
4195         lockdep_assert_held(&mvm->mutex);
4196
4197         if (enable) {
4198                 if (mvmsta->tx_protection == 0)
4199                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
4200                 mvmsta->tx_protection++;
4201         } else {
4202                 mvmsta->tx_protection--;
4203                 if (mvmsta->tx_protection == 0)
4204                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4205         }
4206
4207         return iwl_mvm_send_lq_cmd(mvm, lq);
4208 }
4209
4210 /**
4211  * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection
4212  * @mvmsta: The station
4213  * @enable: Enable Tx protection?
4214  */
4215 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4216                           bool enable)
4217 {
4218         if (iwl_mvm_has_tlc_offload(mvm))
4219                 return rs_fw_tx_protection(mvm, mvmsta, enable);
4220         else
4221                 return rs_drv_tx_protection(mvm, mvmsta, enable);
4222 }