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 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1201                           int tid, struct ieee80211_tx_info *info, bool ndp)
1202 {
1203         int legacy_success;
1204         int retries;
1205         int i;
1206         struct iwl_lq_cmd *table;
1207         u32 lq_hwrate;
1208         struct rs_rate lq_rate, tx_resp_rate;
1209         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1210         u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
1211         u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
1212         u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
1213         u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1214         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1215         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
1216
1217         /* Treat uninitialized rate scaling data same as non-existing. */
1218         if (!lq_sta) {
1219                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1220                 return;
1221         } else if (!lq_sta->pers.drv) {
1222                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1223                 return;
1224         }
1225
1226         /* This packet was aggregated but doesn't carry status info */
1227         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1228             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1229                 return;
1230
1231         if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
1232                                     &tx_resp_rate)) {
1233                 WARN_ON_ONCE(1);
1234                 return;
1235         }
1236
1237 #ifdef CONFIG_MAC80211_DEBUGFS
1238         /* Disable last tx check if we are debugging with fixed rate but
1239          * update tx stats */
1240         if (lq_sta->pers.dbg_fixed_rate) {
1241                 int index = tx_resp_rate.index;
1242                 enum rs_column column;
1243                 int attempts, success;
1244
1245                 column = rs_get_column_from_rate(&tx_resp_rate);
1246                 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1247                               "Can't map rate 0x%x to column",
1248                               tx_resp_hwrate))
1249                         return;
1250
1251                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1252                         attempts = info->status.ampdu_len;
1253                         success = info->status.ampdu_ack_len;
1254                 } else {
1255                         attempts = info->status.rates[0].count;
1256                         success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1257                 }
1258
1259                 lq_sta->pers.tx_stats[column][index].total += attempts;
1260                 lq_sta->pers.tx_stats[column][index].success += success;
1261
1262                 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1263                                tx_resp_hwrate, success, attempts);
1264                 return;
1265         }
1266 #endif
1267
1268         if (time_after(jiffies,
1269                        (unsigned long)(lq_sta->last_tx +
1270                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1271                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1272                 iwl_mvm_rs_rate_init(mvm, sta, info->band, true);
1273                 return;
1274         }
1275         lq_sta->last_tx = jiffies;
1276
1277         /* Ignore this Tx frame response if its initial rate doesn't match
1278          * that of latest Link Quality command.  There may be stragglers
1279          * from a previous Link Quality command, but we're no longer interested
1280          * in those; they're either from the "active" mode while we're trying
1281          * to check "search" mode, or a prior "search" mode after we've moved
1282          * to a new "search" mode (which might become the new "active" mode).
1283          */
1284         table = &lq_sta->lq;
1285         lq_hwrate = le32_to_cpu(table->rs_table[0]);
1286         if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
1287                 WARN_ON_ONCE(1);
1288                 return;
1289         }
1290
1291         /* Here we actually compare this rate to the latest LQ command */
1292         if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
1293                 IWL_DEBUG_RATE(mvm,
1294                                "tx resp color 0x%x does not match 0x%x\n",
1295                                lq_color, LQ_FLAG_COLOR_GET(table->flags));
1296
1297                 /*
1298                  * Since rates mis-match, the last LQ command may have failed.
1299                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1300                  * ... driver.
1301                  */
1302                 lq_sta->missed_rate_counter++;
1303                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1304                         lq_sta->missed_rate_counter = 0;
1305                         IWL_DEBUG_RATE(mvm,
1306                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1307                                        lq_sta->rs_state);
1308                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1309                 }
1310                 /* Regardless, ignore this status info for outdated rate */
1311                 return;
1312         } else
1313                 /* Rate did match, so reset the missed_rate_counter */
1314                 lq_sta->missed_rate_counter = 0;
1315
1316         if (!lq_sta->search_better_tbl) {
1317                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1318                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1319         } else {
1320                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1321                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1322         }
1323
1324         if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1325                 IWL_DEBUG_RATE(mvm,
1326                                "Neither active nor search matches tx rate\n");
1327                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1328                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1329                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1330                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1331                 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1332
1333                 /*
1334                  * no matching table found, let's by-pass the data collection
1335                  * and continue to perform rate scale to find the rate table
1336                  */
1337                 rs_stay_in_table(lq_sta, true);
1338                 goto done;
1339         }
1340
1341         /*
1342          * Updating the frame history depends on whether packets were
1343          * aggregated.
1344          *
1345          * For aggregation, all packets were transmitted at the same rate, the
1346          * first index into rate scale table.
1347          */
1348         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1349                 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
1350                                     info->status.ampdu_len,
1351                                     info->status.ampdu_ack_len,
1352                                     reduced_txp);
1353
1354                 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1355                  * it as a single frame loss as we don't want the success ratio
1356                  * to dip too quickly because a BA wasn't received.
1357                  * For TPC, there's no need for this optimisation since we want
1358                  * to recover very quickly from a bad power reduction and,
1359                  * therefore we'd like the success ratio to get an immediate hit
1360                  * when failing to get a BA, so we'd switch back to a lower or
1361                  * zero power reduction. When FW transmits agg with a rate
1362                  * different from the initial rate, it will not use reduced txp
1363                  * and will send BA notification twice (one empty with reduced
1364                  * txp equal to the value from LQ and one with reduced txp 0).
1365                  * We need to update counters for each txp level accordingly.
1366                  */
1367                 if (info->status.ampdu_ack_len == 0)
1368                         info->status.ampdu_len = 1;
1369
1370                 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, tx_resp_rate.index,
1371                                     info->status.ampdu_len,
1372                                     info->status.ampdu_ack_len);
1373
1374                 /* Update success/fail counts if not searching for new mode */
1375                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1376                         lq_sta->total_success += info->status.ampdu_ack_len;
1377                         lq_sta->total_failed += (info->status.ampdu_len -
1378                                         info->status.ampdu_ack_len);
1379                 }
1380         } else {
1381                 /* For legacy, update frame history with for each Tx retry. */
1382                 retries = info->status.rates[0].count - 1;
1383                 /* HW doesn't send more than 15 retries */
1384                 retries = min(retries, 15);
1385
1386                 /* The last transmission may have been successful */
1387                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1388                 /* Collect data for each rate used during failed TX attempts */
1389                 for (i = 0; i <= retries; ++i) {
1390                         lq_hwrate = le32_to_cpu(table->rs_table[i]);
1391                         if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
1392                                                     &lq_rate)) {
1393                                 WARN_ON_ONCE(1);
1394                                 return;
1395                         }
1396
1397                         /*
1398                          * Only collect stats if retried rate is in the same RS
1399                          * table as active/search.
1400                          */
1401                         if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1402                                 tmp_tbl = curr_tbl;
1403                         else if (rs_rate_column_match(&lq_rate,
1404                                                       &other_tbl->rate))
1405                                 tmp_tbl = other_tbl;
1406                         else
1407                                 continue;
1408
1409                         rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1410                                             tx_resp_rate.index, 1,
1411                                             i < retries ? 0 : legacy_success,
1412                                             reduced_txp);
1413                         rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
1414                                             tx_resp_rate.index, 1,
1415                                             i < retries ? 0 : legacy_success);
1416                 }
1417
1418                 /* Update success/fail counts if not searching for new mode */
1419                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1420                         lq_sta->total_success += legacy_success;
1421                         lq_sta->total_failed += retries + (1 - legacy_success);
1422                 }
1423         }
1424         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1425         lq_sta->last_rate_n_flags = lq_hwrate;
1426         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1427 done:
1428         /* See if there's a better rate or modulation mode to try. */
1429         if (sta->supp_rates[info->band])
1430                 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
1431 }
1432
1433 /*
1434  * mac80211 sends us Tx status
1435  */
1436 static void rs_drv_mac80211_tx_status(void *mvm_r,
1437                                       struct ieee80211_supported_band *sband,
1438                                       struct ieee80211_sta *sta, void *priv_sta,
1439                                       struct sk_buff *skb)
1440 {
1441         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1442         struct iwl_op_mode *op_mode = mvm_r;
1443         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1444         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1445
1446         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1447                 return;
1448
1449         if (!ieee80211_is_data(hdr->frame_control) ||
1450             info->flags & IEEE80211_TX_CTL_NO_ACK)
1451                 return;
1452
1453         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1454                              ieee80211_is_qos_nullfunc(hdr->frame_control));
1455 }
1456
1457 /*
1458  * Begin a period of staying with a selected modulation mode.
1459  * Set "stay_in_tbl" flag to prevent any mode switches.
1460  * Set frame tx success limits according to legacy vs. high-throughput,
1461  * and reset overall (spanning all rates) tx success history statistics.
1462  * These control how long we stay using same modulation mode before
1463  * searching for a new mode.
1464  */
1465 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1466                                  struct iwl_lq_sta *lq_sta)
1467 {
1468         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1469         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1470         if (is_legacy) {
1471                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1472                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1473                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1474         } else {
1475                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1476                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1477                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1478         }
1479         lq_sta->table_count = 0;
1480         lq_sta->total_failed = 0;
1481         lq_sta->total_success = 0;
1482         lq_sta->flush_timer = jiffies;
1483         lq_sta->visited_columns = 0;
1484 }
1485
1486 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1487 {
1488         if (rate_mask)
1489                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1490         return IWL_RATE_INVALID;
1491 }
1492
1493 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1494                                    const struct rs_tx_column *column)
1495 {
1496         switch (column->mode) {
1497         case RS_LEGACY:
1498                 return lq_sta->max_legacy_rate_idx;
1499         case RS_SISO:
1500                 return lq_sta->max_siso_rate_idx;
1501         case RS_MIMO2:
1502                 return lq_sta->max_mimo2_rate_idx;
1503         default:
1504                 WARN_ON_ONCE(1);
1505         }
1506
1507         return lq_sta->max_legacy_rate_idx;
1508 }
1509
1510 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1511                                             const struct rs_tx_column *column,
1512                                             u32 bw)
1513 {
1514         /* Used to choose among HT tables */
1515         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1516
1517         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1518                          column->mode != RS_SISO &&
1519                          column->mode != RS_MIMO2))
1520                 return expected_tpt_legacy;
1521
1522         /* Legacy rates have only one table */
1523         if (column->mode == RS_LEGACY)
1524                 return expected_tpt_legacy;
1525
1526         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1527         /* Choose among many HT tables depending on number of streams
1528          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1529          * status */
1530         if (column->mode == RS_SISO) {
1531                 switch (bw) {
1532                 case RATE_MCS_CHAN_WIDTH_20:
1533                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1534                         break;
1535                 case RATE_MCS_CHAN_WIDTH_40:
1536                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1537                         break;
1538                 case RATE_MCS_CHAN_WIDTH_80:
1539                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1540                         break;
1541                 case RATE_MCS_CHAN_WIDTH_160:
1542                         ht_tbl_pointer = expected_tpt_siso_160MHz;
1543                         break;
1544                 default:
1545                         WARN_ON_ONCE(1);
1546                 }
1547         } else if (column->mode == RS_MIMO2) {
1548                 switch (bw) {
1549                 case RATE_MCS_CHAN_WIDTH_20:
1550                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1551                         break;
1552                 case RATE_MCS_CHAN_WIDTH_40:
1553                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1554                         break;
1555                 case RATE_MCS_CHAN_WIDTH_80:
1556                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1557                         break;
1558                 case RATE_MCS_CHAN_WIDTH_160:
1559                         ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1560                         break;
1561                 default:
1562                         WARN_ON_ONCE(1);
1563                 }
1564         } else {
1565                 WARN_ON_ONCE(1);
1566         }
1567
1568         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1569                 return ht_tbl_pointer[0];
1570         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1571                 return ht_tbl_pointer[1];
1572         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1573                 return ht_tbl_pointer[2];
1574         else                                            /* AGG+SGI */
1575                 return ht_tbl_pointer[3];
1576 }
1577
1578 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1579                                       struct iwl_scale_tbl_info *tbl)
1580 {
1581         struct rs_rate *rate = &tbl->rate;
1582         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1583
1584         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1585 }
1586
1587 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1588                             struct iwl_lq_sta *lq_sta,
1589                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1590                             unsigned long rate_mask, s8 index)
1591 {
1592         struct iwl_scale_tbl_info *active_tbl =
1593             &(lq_sta->lq_info[lq_sta->active_tbl]);
1594         s32 success_ratio = active_tbl->win[index].success_ratio;
1595         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1596         const u16 *tpt_tbl = tbl->expected_tpt;
1597         u16 high_low;
1598         u32 target_tpt;
1599         int rate_idx;
1600
1601         if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1602                 target_tpt = 100 * expected_current_tpt;
1603                 IWL_DEBUG_RATE(mvm,
1604                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1605                                success_ratio, target_tpt);
1606         } else {
1607                 target_tpt = lq_sta->last_tpt;
1608                 IWL_DEBUG_RATE(mvm,
1609                                "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1610                                success_ratio, target_tpt);
1611         }
1612
1613         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1614
1615         while (rate_idx != IWL_RATE_INVALID) {
1616                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1617                         break;
1618
1619                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1620                                                 tbl->rate.type);
1621
1622                 rate_idx = (high_low >> 8) & 0xff;
1623         }
1624
1625         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1626                        rate_idx, target_tpt,
1627                        rate_idx != IWL_RATE_INVALID ?
1628                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1629
1630         return rate_idx;
1631 }
1632
1633 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1634 {
1635         struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->vht_cap;
1636         struct ieee80211_vht_cap vht_cap = {
1637                 .vht_cap_info = cpu_to_le32(sta_vht_cap->cap),
1638                 .supp_mcs = sta_vht_cap->vht_mcs,
1639         };
1640
1641         switch (sta->bandwidth) {
1642         case IEEE80211_STA_RX_BW_160:
1643                 /*
1644                  * Don't use 160 MHz if VHT extended NSS support
1645                  * says we cannot use 2 streams, we don't want to
1646                  * deal with this.
1647                  * We only check MCS 0 - they will support that if
1648                  * we got here at all and we don't care which MCS,
1649                  * we want to determine a more global state.
1650                  */
1651                 if (ieee80211_get_vht_max_nss(&vht_cap,
1652                                               IEEE80211_VHT_CHANWIDTH_160MHZ,
1653                                               0, true) < sta->rx_nss)
1654                         return RATE_MCS_CHAN_WIDTH_80;
1655                 return RATE_MCS_CHAN_WIDTH_160;
1656         case IEEE80211_STA_RX_BW_80:
1657                 return RATE_MCS_CHAN_WIDTH_80;
1658         case IEEE80211_STA_RX_BW_40:
1659                 return RATE_MCS_CHAN_WIDTH_40;
1660         case IEEE80211_STA_RX_BW_20:
1661         default:
1662                 return RATE_MCS_CHAN_WIDTH_20;
1663         }
1664 }
1665
1666 /*
1667  * Check whether we should continue using same modulation mode, or
1668  * begin search for a new mode, based on:
1669  * 1) # tx successes or failures while using this mode
1670  * 2) # times calling this function
1671  * 3) elapsed time in this mode (not used, for now)
1672  */
1673 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1674 {
1675         struct iwl_scale_tbl_info *tbl;
1676         int active_tbl;
1677         int flush_interval_passed = 0;
1678         struct iwl_mvm *mvm;
1679
1680         mvm = lq_sta->pers.drv;
1681         active_tbl = lq_sta->active_tbl;
1682
1683         tbl = &(lq_sta->lq_info[active_tbl]);
1684
1685         /* If we've been disallowing search, see if we should now allow it */
1686         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1687                 /* Elapsed time using current modulation mode */
1688                 if (lq_sta->flush_timer)
1689                         flush_interval_passed =
1690                                 time_after(jiffies,
1691                                            (unsigned long)(lq_sta->flush_timer +
1692                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1693
1694                 /*
1695                  * Check if we should allow search for new modulation mode.
1696                  * If many frames have failed or succeeded, or we've used
1697                  * this same modulation for a long time, allow search, and
1698                  * reset history stats that keep track of whether we should
1699                  * allow a new search.  Also (below) reset all bitmaps and
1700                  * stats in active history.
1701                  */
1702                 if (force_search ||
1703                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1704                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1705                     ((!lq_sta->search_better_tbl) &&
1706                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1707                         IWL_DEBUG_RATE(mvm,
1708                                        "LQ: stay is expired %d %d %d\n",
1709                                      lq_sta->total_failed,
1710                                      lq_sta->total_success,
1711                                      flush_interval_passed);
1712
1713                         /* Allow search for new mode */
1714                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1715                         IWL_DEBUG_RATE(mvm,
1716                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1717                         lq_sta->total_failed = 0;
1718                         lq_sta->total_success = 0;
1719                         lq_sta->flush_timer = 0;
1720                         /* mark the current column as visited */
1721                         lq_sta->visited_columns = BIT(tbl->column);
1722                 /*
1723                  * Else if we've used this modulation mode enough repetitions
1724                  * (regardless of elapsed time or success/failure), reset
1725                  * history bitmaps and rate-specific stats for all rates in
1726                  * active table.
1727                  */
1728                 } else {
1729                         lq_sta->table_count++;
1730                         if (lq_sta->table_count >=
1731                             lq_sta->table_count_limit) {
1732                                 lq_sta->table_count = 0;
1733
1734                                 IWL_DEBUG_RATE(mvm,
1735                                                "LQ: stay in table clear win\n");
1736                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1737                         }
1738                 }
1739
1740                 /* If transitioning to allow "search", reset all history
1741                  * bitmaps and stats in active table (this will become the new
1742                  * "search" table). */
1743                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1744                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1745                 }
1746         }
1747 }
1748
1749 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1750                              struct iwl_scale_tbl_info *tbl,
1751                              enum rs_action scale_action)
1752 {
1753         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1754         int i;
1755
1756         /*
1757          * In case TLC offload is not active amsdu_enabled is either 0xFFFF
1758          * or 0, since there is no per-TID alg.
1759          */
1760         if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1761             tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1762             scale_action == RS_ACTION_DOWNSCALE)
1763                 mvmsta->amsdu_enabled = 0;
1764         else
1765                 mvmsta->amsdu_enabled = 0xFFFF;
1766
1767         if (mvmsta->vif->bss_conf.he_support &&
1768             !iwlwifi_mod_params.disable_11ax)
1769                 mvmsta->max_amsdu_len = sta->max_amsdu_len;
1770         else
1771                 mvmsta->max_amsdu_len = min_t(int, sta->max_amsdu_len, 8500);
1772
1773         sta->max_rc_amsdu_len = mvmsta->max_amsdu_len;
1774
1775         for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
1776                 if (mvmsta->amsdu_enabled)
1777                         sta->max_tid_amsdu_len[i] =
1778                                 iwl_mvm_max_amsdu_size(mvm, sta, i);
1779                 else
1780                         /*
1781                          * Not so elegant, but this will effectively
1782                          * prevent AMSDU on this TID
1783                          */
1784                         sta->max_tid_amsdu_len[i] = 1;
1785         }
1786 }
1787
1788 /*
1789  * setup rate table in uCode
1790  */
1791 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1792                                struct ieee80211_sta *sta,
1793                                struct iwl_lq_sta *lq_sta,
1794                                struct iwl_scale_tbl_info *tbl)
1795 {
1796         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1797         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1798 }
1799
1800 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1801                               struct ieee80211_sta *sta,
1802                               struct iwl_lq_sta *lq_sta,
1803                               struct iwl_scale_tbl_info *tbl,
1804                               enum rs_action scale_action)
1805 {
1806         if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80)
1807                 return false;
1808
1809         if (!is_vht_siso(&tbl->rate))
1810                 return false;
1811
1812         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1813             (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1814             (scale_action == RS_ACTION_DOWNSCALE)) {
1815                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1816                 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1817                 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1818                 goto tweaked;
1819         }
1820
1821         /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1822          * sustainable, i.e. we're past the test window. We can't go back
1823          * if MCS5 is just tested as this will happen always after switching
1824          * to 20Mhz MCS4 because the rate stats are cleared.
1825          */
1826         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1827             (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1828              (scale_action == RS_ACTION_STAY)) ||
1829              ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1830               (scale_action == RS_ACTION_UPSCALE)))) {
1831                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1832                 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1833                 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1834                 goto tweaked;
1835         }
1836
1837         return false;
1838
1839 tweaked:
1840         rs_set_expected_tpt_table(lq_sta, tbl);
1841         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1842         return true;
1843 }
1844
1845 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1846                                          struct iwl_lq_sta *lq_sta,
1847                                          struct ieee80211_sta *sta,
1848                                          struct iwl_scale_tbl_info *tbl)
1849 {
1850         int i, j, max_rate;
1851         enum rs_column next_col_id;
1852         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1853         const struct rs_tx_column *next_col;
1854         allow_column_func_t allow_func;
1855         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1856         const u16 *expected_tpt_tbl;
1857         u16 tpt, max_expected_tpt;
1858
1859         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1860                 next_col_id = curr_col->next_columns[i];
1861
1862                 if (next_col_id == RS_COLUMN_INVALID)
1863                         continue;
1864
1865                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1866                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1867                                        next_col_id);
1868                         continue;
1869                 }
1870
1871                 next_col = &rs_tx_columns[next_col_id];
1872
1873                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1874                         IWL_DEBUG_RATE(mvm,
1875                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1876                                        next_col_id, valid_ants, next_col->ant);
1877                         continue;
1878                 }
1879
1880                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1881                         allow_func = next_col->checks[j];
1882                         if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1883                                                       next_col))
1884                                 break;
1885                 }
1886
1887                 if (j != MAX_COLUMN_CHECKS) {
1888                         IWL_DEBUG_RATE(mvm,
1889                                        "Skip column %d: not allowed (check %d failed)\n",
1890                                        next_col_id, j);
1891
1892                         continue;
1893                 }
1894
1895                 tpt = lq_sta->last_tpt / 100;
1896                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1897                                                      rs_bw_from_sta_bw(sta));
1898                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1899                         continue;
1900
1901                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1902                 if (max_rate == IWL_RATE_INVALID) {
1903                         IWL_DEBUG_RATE(mvm,
1904                                        "Skip column %d: no rate is allowed in this column\n",
1905                                        next_col_id);
1906                         continue;
1907                 }
1908
1909                 max_expected_tpt = expected_tpt_tbl[max_rate];
1910                 if (tpt >= max_expected_tpt) {
1911                         IWL_DEBUG_RATE(mvm,
1912                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1913                                        next_col_id, max_expected_tpt, tpt);
1914                         continue;
1915                 }
1916
1917                 IWL_DEBUG_RATE(mvm,
1918                                "Found potential column %d. Max expected %d current %d\n",
1919                                next_col_id, max_expected_tpt, tpt);
1920                 break;
1921         }
1922
1923         if (i == MAX_NEXT_COLUMNS)
1924                 return RS_COLUMN_INVALID;
1925
1926         return next_col_id;
1927 }
1928
1929 static int rs_switch_to_column(struct iwl_mvm *mvm,
1930                                struct iwl_lq_sta *lq_sta,
1931                                struct ieee80211_sta *sta,
1932                                enum rs_column col_id)
1933 {
1934         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1935         struct iwl_scale_tbl_info *search_tbl =
1936                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1937         struct rs_rate *rate = &search_tbl->rate;
1938         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1939         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1940         unsigned long rate_mask = 0;
1941         u32 rate_idx = 0;
1942
1943         memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1944
1945         rate->sgi = column->sgi;
1946         rate->ant = column->ant;
1947
1948         if (column->mode == RS_LEGACY) {
1949                 if (lq_sta->band == NL80211_BAND_5GHZ)
1950                         rate->type = LQ_LEGACY_A;
1951                 else
1952                         rate->type = LQ_LEGACY_G;
1953
1954                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1955                 rate->ldpc = false;
1956                 rate_mask = lq_sta->active_legacy_rate;
1957         } else if (column->mode == RS_SISO) {
1958                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1959                 rate_mask = lq_sta->active_siso_rate;
1960         } else if (column->mode == RS_MIMO2) {
1961                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1962                 rate_mask = lq_sta->active_mimo2_rate;
1963         } else {
1964                 WARN_ONCE(1, "Bad column mode");
1965         }
1966
1967         if (column->mode != RS_LEGACY) {
1968                 rate->bw = rs_bw_from_sta_bw(sta);
1969                 rate->ldpc = lq_sta->ldpc;
1970         }
1971
1972         search_tbl->column = col_id;
1973         rs_set_expected_tpt_table(lq_sta, search_tbl);
1974
1975         lq_sta->visited_columns |= BIT(col_id);
1976
1977         /* Get the best matching rate if we're changing modes. e.g.
1978          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1979          */
1980         if (curr_column->mode != column->mode) {
1981                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1982                                             rate_mask, rate->index);
1983
1984                 if ((rate_idx == IWL_RATE_INVALID) ||
1985                     !(BIT(rate_idx) & rate_mask)) {
1986                         IWL_DEBUG_RATE(mvm,
1987                                        "can not switch with index %d"
1988                                        " rate mask %lx\n",
1989                                        rate_idx, rate_mask);
1990
1991                         goto err;
1992                 }
1993
1994                 rate->index = rate_idx;
1995         }
1996
1997         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1998                        col_id, rate->index);
1999
2000         return 0;
2001
2002 err:
2003         rate->type = LQ_NONE;
2004         return -1;
2005 }
2006
2007 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
2008                                          struct iwl_scale_tbl_info *tbl,
2009                                          s32 sr, int low, int high,
2010                                          int current_tpt,
2011                                          int low_tpt, int high_tpt)
2012 {
2013         enum rs_action action = RS_ACTION_STAY;
2014
2015         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
2016             (current_tpt == 0)) {
2017                 IWL_DEBUG_RATE(mvm,
2018                                "Decrease rate because of low SR\n");
2019                 return RS_ACTION_DOWNSCALE;
2020         }
2021
2022         if ((low_tpt == IWL_INVALID_VALUE) &&
2023             (high_tpt == IWL_INVALID_VALUE) &&
2024             (high != IWL_RATE_INVALID)) {
2025                 IWL_DEBUG_RATE(mvm,
2026                                "No data about high/low rates. Increase rate\n");
2027                 return RS_ACTION_UPSCALE;
2028         }
2029
2030         if ((high_tpt == IWL_INVALID_VALUE) &&
2031             (high != IWL_RATE_INVALID) &&
2032             (low_tpt != IWL_INVALID_VALUE) &&
2033             (low_tpt < current_tpt)) {
2034                 IWL_DEBUG_RATE(mvm,
2035                                "No data about high rate and low rate is worse. Increase rate\n");
2036                 return RS_ACTION_UPSCALE;
2037         }
2038
2039         if ((high_tpt != IWL_INVALID_VALUE) &&
2040             (high_tpt > current_tpt)) {
2041                 IWL_DEBUG_RATE(mvm,
2042                                "Higher rate is better. Increate rate\n");
2043                 return RS_ACTION_UPSCALE;
2044         }
2045
2046         if ((low_tpt != IWL_INVALID_VALUE) &&
2047             (high_tpt != IWL_INVALID_VALUE) &&
2048             (low_tpt < current_tpt) &&
2049             (high_tpt < current_tpt)) {
2050                 IWL_DEBUG_RATE(mvm,
2051                                "Both high and low are worse. Maintain rate\n");
2052                 return RS_ACTION_STAY;
2053         }
2054
2055         if ((low_tpt != IWL_INVALID_VALUE) &&
2056             (low_tpt > current_tpt)) {
2057                 IWL_DEBUG_RATE(mvm,
2058                                "Lower rate is better\n");
2059                 action = RS_ACTION_DOWNSCALE;
2060                 goto out;
2061         }
2062
2063         if ((low_tpt == IWL_INVALID_VALUE) &&
2064             (low != IWL_RATE_INVALID)) {
2065                 IWL_DEBUG_RATE(mvm,
2066                                "No data about lower rate\n");
2067                 action = RS_ACTION_DOWNSCALE;
2068                 goto out;
2069         }
2070
2071         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
2072
2073 out:
2074         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
2075                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
2076                         IWL_DEBUG_RATE(mvm,
2077                                        "SR is above NO DECREASE. Avoid downscale\n");
2078                         action = RS_ACTION_STAY;
2079                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
2080                         IWL_DEBUG_RATE(mvm,
2081                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
2082                         action = RS_ACTION_STAY;
2083                 } else {
2084                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
2085                 }
2086         }
2087
2088         return action;
2089 }
2090
2091 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2092                           struct iwl_lq_sta *lq_sta)
2093 {
2094         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
2095          * supports STBC of at least 1*SS
2096          */
2097         if (!lq_sta->stbc_capable)
2098                 return false;
2099
2100         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2101                 return false;
2102
2103         return true;
2104 }
2105
2106 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2107                                 int *weaker, int *stronger)
2108 {
2109         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2110         if (*weaker > TPC_MAX_REDUCTION)
2111                 *weaker = TPC_INVALID;
2112
2113         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2114         if (*stronger < 0)
2115                 *stronger = TPC_INVALID;
2116 }
2117
2118 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2119                            struct rs_rate *rate, enum nl80211_band band)
2120 {
2121         int index = rate->index;
2122         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2123         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2124                                 !vif->bss_conf.ps);
2125
2126         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2127                        cam, sta_ps_disabled);
2128         /*
2129          * allow tpc only if power management is enabled, or bt coex
2130          * activity grade allows it and we are on 2.4Ghz.
2131          */
2132         if ((cam || sta_ps_disabled) &&
2133             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2134                 return false;
2135
2136         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2137         if (is_legacy(rate))
2138                 return index == IWL_RATE_54M_INDEX;
2139         if (is_ht(rate))
2140                 return index == IWL_RATE_MCS_7_INDEX;
2141         if (is_vht(rate))
2142                 return index == IWL_RATE_MCS_7_INDEX ||
2143                        index == IWL_RATE_MCS_8_INDEX ||
2144                        index == IWL_RATE_MCS_9_INDEX;
2145
2146         WARN_ON_ONCE(1);
2147         return false;
2148 }
2149
2150 enum tpc_action {
2151         TPC_ACTION_STAY,
2152         TPC_ACTION_DECREASE,
2153         TPC_ACTION_INCREASE,
2154         TPC_ACTION_NO_RESTIRCTION,
2155 };
2156
2157 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2158                                          s32 sr, int weak, int strong,
2159                                          int current_tpt,
2160                                          int weak_tpt, int strong_tpt)
2161 {
2162         /* stay until we have valid tpt */
2163         if (current_tpt == IWL_INVALID_VALUE) {
2164                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2165                 return TPC_ACTION_STAY;
2166         }
2167
2168         /* Too many failures, increase txp */
2169         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2170             current_tpt == 0) {
2171                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2172                 return TPC_ACTION_NO_RESTIRCTION;
2173         }
2174
2175         /* try decreasing first if applicable */
2176         if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2177             weak != TPC_INVALID) {
2178                 if (weak_tpt == IWL_INVALID_VALUE &&
2179                     (strong_tpt == IWL_INVALID_VALUE ||
2180                      current_tpt >= strong_tpt)) {
2181                         IWL_DEBUG_RATE(mvm,
2182                                        "no weak txp measurement. decrease txp\n");
2183                         return TPC_ACTION_DECREASE;
2184                 }
2185
2186                 if (weak_tpt > current_tpt) {
2187                         IWL_DEBUG_RATE(mvm,
2188                                        "lower txp has better tpt. decrease txp\n");
2189                         return TPC_ACTION_DECREASE;
2190                 }
2191         }
2192
2193         /* next, increase if needed */
2194         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2195             strong != TPC_INVALID) {
2196                 if (weak_tpt == IWL_INVALID_VALUE &&
2197                     strong_tpt != IWL_INVALID_VALUE &&
2198                     current_tpt < strong_tpt) {
2199                         IWL_DEBUG_RATE(mvm,
2200                                        "higher txp has better tpt. increase txp\n");
2201                         return TPC_ACTION_INCREASE;
2202                 }
2203
2204                 if (weak_tpt < current_tpt &&
2205                     (strong_tpt == IWL_INVALID_VALUE ||
2206                      strong_tpt > current_tpt)) {
2207                         IWL_DEBUG_RATE(mvm,
2208                                        "lower txp has worse tpt. increase txp\n");
2209                         return TPC_ACTION_INCREASE;
2210                 }
2211         }
2212
2213         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2214         return TPC_ACTION_STAY;
2215 }
2216
2217 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2218                            struct ieee80211_sta *sta,
2219                            struct iwl_lq_sta *lq_sta,
2220                            struct iwl_scale_tbl_info *tbl)
2221 {
2222         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2223         struct ieee80211_vif *vif = mvm_sta->vif;
2224         struct ieee80211_chanctx_conf *chanctx_conf;
2225         enum nl80211_band band;
2226         struct iwl_rate_scale_data *window;
2227         struct rs_rate *rate = &tbl->rate;
2228         enum tpc_action action;
2229         s32 sr;
2230         u8 cur = lq_sta->lq.reduced_tpc;
2231         int current_tpt;
2232         int weak, strong;
2233         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2234
2235 #ifdef CONFIG_MAC80211_DEBUGFS
2236         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2237                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2238                                lq_sta->pers.dbg_fixed_txp_reduction);
2239                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2240                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2241         }
2242 #endif
2243
2244         rcu_read_lock();
2245         chanctx_conf = rcu_dereference(vif->chanctx_conf);
2246         if (WARN_ON(!chanctx_conf))
2247                 band = NUM_NL80211_BANDS;
2248         else
2249                 band = chanctx_conf->def.chan->band;
2250         rcu_read_unlock();
2251
2252         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2253                 IWL_DEBUG_RATE(mvm,
2254                                "tpc is not allowed. remove txp restrictions\n");
2255                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2256                 return cur != TPC_NO_REDUCTION;
2257         }
2258
2259         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2260
2261         /* Collect measured throughputs for current and adjacent rates */
2262         window = tbl->tpc_win;
2263         sr = window[cur].success_ratio;
2264         current_tpt = window[cur].average_tpt;
2265         if (weak != TPC_INVALID)
2266                 weak_tpt = window[weak].average_tpt;
2267         if (strong != TPC_INVALID)
2268                 strong_tpt = window[strong].average_tpt;
2269
2270         IWL_DEBUG_RATE(mvm,
2271                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2272                        cur, current_tpt, sr, weak, strong,
2273                        weak_tpt, strong_tpt);
2274
2275         action = rs_get_tpc_action(mvm, sr, weak, strong,
2276                                    current_tpt, weak_tpt, strong_tpt);
2277
2278         /* override actions if we are on the edge */
2279         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2280                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2281                 action = TPC_ACTION_STAY;
2282         } else if (strong == TPC_INVALID &&
2283                    (action == TPC_ACTION_INCREASE ||
2284                     action == TPC_ACTION_NO_RESTIRCTION)) {
2285                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2286                 action = TPC_ACTION_STAY;
2287         }
2288
2289         switch (action) {
2290         case TPC_ACTION_DECREASE:
2291                 lq_sta->lq.reduced_tpc = weak;
2292                 return true;
2293         case TPC_ACTION_INCREASE:
2294                 lq_sta->lq.reduced_tpc = strong;
2295                 return true;
2296         case TPC_ACTION_NO_RESTIRCTION:
2297                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2298                 return true;
2299         case TPC_ACTION_STAY:
2300                 /* do nothing */
2301                 break;
2302         }
2303         return false;
2304 }
2305
2306 /*
2307  * Do rate scaling and search for new modulation mode.
2308  */
2309 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2310                                   struct ieee80211_sta *sta,
2311                                   struct iwl_lq_sta *lq_sta,
2312                                   int tid, bool ndp)
2313 {
2314         int low = IWL_RATE_INVALID;
2315         int high = IWL_RATE_INVALID;
2316         int index;
2317         struct iwl_rate_scale_data *window = NULL;
2318         int current_tpt = IWL_INVALID_VALUE;
2319         int low_tpt = IWL_INVALID_VALUE;
2320         int high_tpt = IWL_INVALID_VALUE;
2321         u32 fail_count;
2322         enum rs_action scale_action = RS_ACTION_STAY;
2323         u16 rate_mask;
2324         u8 update_lq = 0;
2325         struct iwl_scale_tbl_info *tbl, *tbl1;
2326         u8 active_tbl = 0;
2327         u8 done_search = 0;
2328         u16 high_low;
2329         s32 sr;
2330         u8 prev_agg = lq_sta->is_agg;
2331         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2332         struct rs_rate *rate;
2333
2334         lq_sta->is_agg = !!mvmsta->agg_tids;
2335
2336         /*
2337          * Select rate-scale / modulation-mode table to work with in
2338          * the rest of this function:  "search" if searching for better
2339          * modulation mode, or "active" if doing rate scaling within a mode.
2340          */
2341         if (!lq_sta->search_better_tbl)
2342                 active_tbl = lq_sta->active_tbl;
2343         else
2344                 active_tbl = 1 - lq_sta->active_tbl;
2345
2346         tbl = &(lq_sta->lq_info[active_tbl]);
2347         rate = &tbl->rate;
2348
2349         if (prev_agg != lq_sta->is_agg) {
2350                 IWL_DEBUG_RATE(mvm,
2351                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2352                                prev_agg, lq_sta->is_agg);
2353                 rs_set_expected_tpt_table(lq_sta, tbl);
2354                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2355         }
2356
2357         /* current tx rate */
2358         index = rate->index;
2359
2360         /* rates available for this association, and for modulation mode */
2361         rate_mask = rs_get_supported_rates(lq_sta, rate);
2362
2363         if (!(BIT(index) & rate_mask)) {
2364                 IWL_ERR(mvm, "Current Rate is not valid\n");
2365                 if (lq_sta->search_better_tbl) {
2366                         /* revert to active table if search table is not valid*/
2367                         rate->type = LQ_NONE;
2368                         lq_sta->search_better_tbl = 0;
2369                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2370                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2371                 }
2372                 return;
2373         }
2374
2375         /* Get expected throughput table and history window for current rate */
2376         if (!tbl->expected_tpt) {
2377                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2378                 return;
2379         }
2380
2381         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2382         window = &(tbl->win[index]);
2383
2384         /*
2385          * If there is not enough history to calculate actual average
2386          * throughput, keep analyzing results of more tx frames, without
2387          * changing rate or mode (bypass most of the rest of this function).
2388          * Set up new rate table in uCode only if old rate is not supported
2389          * in current association (use new rate found above).
2390          */
2391         fail_count = window->counter - window->success_counter;
2392         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2393             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2394                 IWL_DEBUG_RATE(mvm,
2395                                "%s: Test Window: succ %d total %d\n",
2396                                rs_pretty_rate(rate),
2397                                window->success_counter, window->counter);
2398
2399                 /* Can't calculate this yet; not enough history */
2400                 window->average_tpt = IWL_INVALID_VALUE;
2401
2402                 /* Should we stay with this modulation mode,
2403                  * or search for a new one? */
2404                 rs_stay_in_table(lq_sta, false);
2405
2406                 return;
2407         }
2408
2409         /* If we are searching for better modulation mode, check success. */
2410         if (lq_sta->search_better_tbl) {
2411                 /* If good success, continue using the "search" mode;
2412                  * no need to send new link quality command, since we're
2413                  * continuing to use the setup that we've been trying. */
2414                 if (window->average_tpt > lq_sta->last_tpt) {
2415                         IWL_DEBUG_RATE(mvm,
2416                                        "SWITCHING TO NEW TABLE SR: %d "
2417                                        "cur-tpt %d old-tpt %d\n",
2418                                        window->success_ratio,
2419                                        window->average_tpt,
2420                                        lq_sta->last_tpt);
2421
2422                         /* Swap tables; "search" becomes "active" */
2423                         lq_sta->active_tbl = active_tbl;
2424                         current_tpt = window->average_tpt;
2425                 /* Else poor success; go back to mode in "active" table */
2426                 } else {
2427                         IWL_DEBUG_RATE(mvm,
2428                                        "GOING BACK TO THE OLD TABLE: SR %d "
2429                                        "cur-tpt %d old-tpt %d\n",
2430                                        window->success_ratio,
2431                                        window->average_tpt,
2432                                        lq_sta->last_tpt);
2433
2434                         /* Nullify "search" table */
2435                         rate->type = LQ_NONE;
2436
2437                         /* Revert to "active" table */
2438                         active_tbl = lq_sta->active_tbl;
2439                         tbl = &(lq_sta->lq_info[active_tbl]);
2440
2441                         /* Revert to "active" rate and throughput info */
2442                         index = tbl->rate.index;
2443                         current_tpt = lq_sta->last_tpt;
2444
2445                         /* Need to set up a new rate table in uCode */
2446                         update_lq = 1;
2447                 }
2448
2449                 /* Either way, we've made a decision; modulation mode
2450                  * search is done, allow rate adjustment next time. */
2451                 lq_sta->search_better_tbl = 0;
2452                 done_search = 1;        /* Don't switch modes below! */
2453                 goto lq_update;
2454         }
2455
2456         /* (Else) not in search of better modulation mode, try for better
2457          * starting rate, while staying in this mode. */
2458         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2459         low = high_low & 0xff;
2460         high = (high_low >> 8) & 0xff;
2461
2462         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2463
2464         sr = window->success_ratio;
2465
2466         /* Collect measured throughputs for current and adjacent rates */
2467         current_tpt = window->average_tpt;
2468         if (low != IWL_RATE_INVALID)
2469                 low_tpt = tbl->win[low].average_tpt;
2470         if (high != IWL_RATE_INVALID)
2471                 high_tpt = tbl->win[high].average_tpt;
2472
2473         IWL_DEBUG_RATE(mvm,
2474                        "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2475                        rs_pretty_rate(rate), current_tpt, sr,
2476                        low, high, low_tpt, high_tpt);
2477
2478         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2479                                           current_tpt, low_tpt, high_tpt);
2480
2481         /* Force a search in case BT doesn't like us being in MIMO */
2482         if (is_mimo(rate) &&
2483             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2484                 IWL_DEBUG_RATE(mvm,
2485                                "BT Coex forbids MIMO. Search for new config\n");
2486                 rs_stay_in_table(lq_sta, true);
2487                 goto lq_update;
2488         }
2489
2490         switch (scale_action) {
2491         case RS_ACTION_DOWNSCALE:
2492                 /* Decrease starting rate, update uCode's rate table */
2493                 if (low != IWL_RATE_INVALID) {
2494                         update_lq = 1;
2495                         index = low;
2496                 } else {
2497                         IWL_DEBUG_RATE(mvm,
2498                                        "At the bottom rate. Can't decrease\n");
2499                 }
2500
2501                 break;
2502         case RS_ACTION_UPSCALE:
2503                 /* Increase starting rate, update uCode's rate table */
2504                 if (high != IWL_RATE_INVALID) {
2505                         update_lq = 1;
2506                         index = high;
2507                 } else {
2508                         IWL_DEBUG_RATE(mvm,
2509                                        "At the top rate. Can't increase\n");
2510                 }
2511
2512                 break;
2513         case RS_ACTION_STAY:
2514                 /* No change */
2515                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2516                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2517                 break;
2518         default:
2519                 break;
2520         }
2521
2522 lq_update:
2523         /* Replace uCode's rate table for the destination station. */
2524         if (update_lq) {
2525                 tbl->rate.index = index;
2526                 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2527                         rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2528                 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2529                 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2530         }
2531
2532         rs_stay_in_table(lq_sta, false);
2533
2534         /*
2535          * Search for new modulation mode if we're:
2536          * 1)  Not changing rates right now
2537          * 2)  Not just finishing up a search
2538          * 3)  Allowing a new search
2539          */
2540         if (!update_lq && !done_search &&
2541             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2542             && window->counter) {
2543                 enum rs_column next_column;
2544
2545                 /* Save current throughput to compare with "search" throughput*/
2546                 lq_sta->last_tpt = current_tpt;
2547
2548                 IWL_DEBUG_RATE(mvm,
2549                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2550                                update_lq, done_search, lq_sta->rs_state,
2551                                window->counter);
2552
2553                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2554                 if (next_column != RS_COLUMN_INVALID) {
2555                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2556                                                       next_column);
2557                         if (!ret)
2558                                 lq_sta->search_better_tbl = 1;
2559                 } else {
2560                         IWL_DEBUG_RATE(mvm,
2561                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2562                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2563                 }
2564
2565                 /* If new "search" mode was selected, set up in uCode table */
2566                 if (lq_sta->search_better_tbl) {
2567                         /* Access the "search" table, clear its history. */
2568                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2569                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2570
2571                         /* Use new "search" start rate */
2572                         index = tbl->rate.index;
2573
2574                         rs_dump_rate(mvm, &tbl->rate,
2575                                      "Switch to SEARCH TABLE:");
2576                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2577                 } else {
2578                         done_search = 1;
2579                 }
2580         }
2581
2582         if (!ndp)
2583                 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2584
2585         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2586                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2587                 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2588         }
2589 }
2590
2591 struct rs_init_rate_info {
2592         s8 rssi;
2593         u8 rate_idx;
2594 };
2595
2596 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2597         { -60, IWL_RATE_54M_INDEX },
2598         { -64, IWL_RATE_48M_INDEX },
2599         { -68, IWL_RATE_36M_INDEX },
2600         { -80, IWL_RATE_24M_INDEX },
2601         { -84, IWL_RATE_18M_INDEX },
2602         { -85, IWL_RATE_12M_INDEX },
2603         { -86, IWL_RATE_11M_INDEX },
2604         { -88, IWL_RATE_5M_INDEX  },
2605         { -90, IWL_RATE_2M_INDEX  },
2606         { S8_MIN, IWL_RATE_1M_INDEX },
2607 };
2608
2609 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2610         { -60, IWL_RATE_54M_INDEX },
2611         { -64, IWL_RATE_48M_INDEX },
2612         { -72, IWL_RATE_36M_INDEX },
2613         { -80, IWL_RATE_24M_INDEX },
2614         { -84, IWL_RATE_18M_INDEX },
2615         { -85, IWL_RATE_12M_INDEX },
2616         { -87, IWL_RATE_9M_INDEX  },
2617         { S8_MIN, IWL_RATE_6M_INDEX },
2618 };
2619
2620 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2621         { -60, IWL_RATE_MCS_7_INDEX },
2622         { -64, IWL_RATE_MCS_6_INDEX },
2623         { -68, IWL_RATE_MCS_5_INDEX },
2624         { -72, IWL_RATE_MCS_4_INDEX },
2625         { -80, IWL_RATE_MCS_3_INDEX },
2626         { -84, IWL_RATE_MCS_2_INDEX },
2627         { -85, IWL_RATE_MCS_1_INDEX },
2628         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2629 };
2630
2631 /* MCS index 9 is not valid for 20MHz VHT channel width,
2632  * but is ok for 40, 80 and 160MHz channels.
2633  */
2634 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2635         { -60, IWL_RATE_MCS_8_INDEX },
2636         { -64, IWL_RATE_MCS_7_INDEX },
2637         { -68, IWL_RATE_MCS_6_INDEX },
2638         { -72, IWL_RATE_MCS_5_INDEX },
2639         { -80, IWL_RATE_MCS_4_INDEX },
2640         { -84, IWL_RATE_MCS_3_INDEX },
2641         { -85, IWL_RATE_MCS_2_INDEX },
2642         { -87, IWL_RATE_MCS_1_INDEX },
2643         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2644 };
2645
2646 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2647         { -60, IWL_RATE_MCS_9_INDEX },
2648         { -64, IWL_RATE_MCS_8_INDEX },
2649         { -68, IWL_RATE_MCS_7_INDEX },
2650         { -72, IWL_RATE_MCS_6_INDEX },
2651         { -80, IWL_RATE_MCS_5_INDEX },
2652         { -84, IWL_RATE_MCS_4_INDEX },
2653         { -85, IWL_RATE_MCS_3_INDEX },
2654         { -87, IWL_RATE_MCS_2_INDEX },
2655         { -88, IWL_RATE_MCS_1_INDEX },
2656         { S8_MIN, IWL_RATE_MCS_0_INDEX },
2657 };
2658
2659 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2660
2661 /* Init the optimal rate based on STA caps
2662  * This combined with rssi is used to report the last tx rate
2663  * to userspace when we haven't transmitted enough frames.
2664  */
2665 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2666                                  struct ieee80211_sta *sta,
2667                                  struct iwl_lq_sta *lq_sta)
2668 {
2669         struct rs_rate *rate = &lq_sta->optimal_rate;
2670
2671         if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2672                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2673         else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2674                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2675         else if (lq_sta->band == NL80211_BAND_5GHZ)
2676                 rate->type = LQ_LEGACY_A;
2677         else
2678                 rate->type = LQ_LEGACY_G;
2679
2680         rate->bw = rs_bw_from_sta_bw(sta);
2681         rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2682
2683         /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2684
2685         if (is_mimo(rate)) {
2686                 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2687         } else if (is_siso(rate)) {
2688                 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2689         } else {
2690                 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2691
2692                 if (lq_sta->band == NL80211_BAND_5GHZ) {
2693                         lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2694                         lq_sta->optimal_nentries =
2695                                 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2696                 } else {
2697                         lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2698                         lq_sta->optimal_nentries =
2699                                 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2700                 }
2701         }
2702
2703         if (is_vht(rate)) {
2704                 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2705                         lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2706                         lq_sta->optimal_nentries =
2707                                 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2708                 } else {
2709                         lq_sta->optimal_rates = rs_optimal_rates_vht;
2710                         lq_sta->optimal_nentries =
2711                                 ARRAY_SIZE(rs_optimal_rates_vht);
2712                 }
2713         } else if (is_ht(rate)) {
2714                 lq_sta->optimal_rates = rs_optimal_rates_ht;
2715                 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2716         }
2717 }
2718
2719 /* Compute the optimal rate index based on RSSI */
2720 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2721                                            struct iwl_lq_sta *lq_sta)
2722 {
2723         struct rs_rate *rate = &lq_sta->optimal_rate;
2724         int i;
2725
2726         rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2727                                      BITS_PER_LONG);
2728
2729         for (i = 0; i < lq_sta->optimal_nentries; i++) {
2730                 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2731
2732                 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2733                     (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2734                         rate->index = rate_idx;
2735                         break;
2736                 }
2737         }
2738
2739         return rate;
2740 }
2741
2742 /* Choose an initial legacy rate and antenna to use based on the RSSI
2743  * of last Rx
2744  */
2745 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2746                                 struct ieee80211_sta *sta,
2747                                 struct iwl_lq_sta *lq_sta,
2748                                 enum nl80211_band band,
2749                                 struct rs_rate *rate)
2750 {
2751         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2752         int i, nentries;
2753         unsigned long active_rate;
2754         s8 best_rssi = S8_MIN;
2755         u8 best_ant = ANT_NONE;
2756         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2757         const struct rs_init_rate_info *initial_rates;
2758
2759         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2760                 if (!(lq_sta->pers.chains & BIT(i)))
2761                         continue;
2762
2763                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2764                         best_rssi = lq_sta->pers.chain_signal[i];
2765                         best_ant = BIT(i);
2766                 }
2767         }
2768
2769         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2770                        rs_pretty_ant(best_ant), best_rssi);
2771
2772         if (best_ant != ANT_A && best_ant != ANT_B)
2773                 rate->ant = first_antenna(valid_tx_ant);
2774         else
2775                 rate->ant = best_ant;
2776
2777         rate->sgi = false;
2778         rate->ldpc = false;
2779         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2780
2781         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2782                                      BITS_PER_LONG);
2783
2784         if (band == NL80211_BAND_5GHZ) {
2785                 rate->type = LQ_LEGACY_A;
2786                 initial_rates = rs_optimal_rates_5ghz_legacy;
2787                 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2788         } else {
2789                 rate->type = LQ_LEGACY_G;
2790                 initial_rates = rs_optimal_rates_24ghz_legacy;
2791                 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2792         }
2793
2794         if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2795                 goto out;
2796
2797         /* Start from a higher rate if the corresponding debug capability
2798          * is enabled. The rate is chosen according to AP capabilities.
2799          * In case of VHT/HT when the rssi is low fallback to the case of
2800          * legacy rates.
2801          */
2802         if (sta->vht_cap.vht_supported &&
2803             best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2804                 /*
2805                  * In AP mode, when a new station associates, rs is initialized
2806                  * immediately upon association completion, before the phy
2807                  * context is updated with the association parameters, so the
2808                  * sta bandwidth might be wider than the phy context allows.
2809                  * To avoid this issue, always initialize rs with 20mhz
2810                  * bandwidth rate, and after authorization, when the phy context
2811                  * is already up-to-date, re-init rs with the correct bw.
2812                  */
2813                 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ?
2814                                 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2815
2816                 switch (bw) {
2817                 case RATE_MCS_CHAN_WIDTH_40:
2818                 case RATE_MCS_CHAN_WIDTH_80:
2819                 case RATE_MCS_CHAN_WIDTH_160:
2820                         initial_rates = rs_optimal_rates_vht;
2821                         nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2822                         break;
2823                 case RATE_MCS_CHAN_WIDTH_20:
2824                         initial_rates = rs_optimal_rates_vht_20mhz;
2825                         nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2826                         break;
2827                 default:
2828                         IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2829                         goto out;
2830                 }
2831
2832                 active_rate = lq_sta->active_siso_rate;
2833                 rate->type = LQ_VHT_SISO;
2834                 rate->bw = bw;
2835         } else if (sta->ht_cap.ht_supported &&
2836                    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2837                 initial_rates = rs_optimal_rates_ht;
2838                 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2839                 active_rate = lq_sta->active_siso_rate;
2840                 rate->type = LQ_HT_SISO;
2841         } else {
2842                 active_rate = lq_sta->active_legacy_rate;
2843         }
2844
2845         for (i = 0; i < nentries; i++) {
2846                 int rate_idx = initial_rates[i].rate_idx;
2847
2848                 if ((best_rssi >= initial_rates[i].rssi) &&
2849                     (BIT(rate_idx) & active_rate)) {
2850                         rate->index = rate_idx;
2851                         break;
2852                 }
2853         }
2854
2855 out:
2856         rs_dump_rate(mvm, rate, "INITIAL");
2857 }
2858
2859 /* Save info about RSSI of last Rx */
2860 void rs_update_last_rssi(struct iwl_mvm *mvm,
2861                          struct iwl_mvm_sta *mvmsta,
2862                          struct ieee80211_rx_status *rx_status)
2863 {
2864         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2865         int i;
2866
2867         lq_sta->pers.chains = rx_status->chains;
2868         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2869         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2870         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2871         lq_sta->pers.last_rssi = S8_MIN;
2872
2873         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2874                 if (!(lq_sta->pers.chains & BIT(i)))
2875                         continue;
2876
2877                 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2878                         lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2879         }
2880 }
2881
2882 /**
2883  * rs_initialize_lq - Initialize a station's hardware rate table
2884  *
2885  * The uCode's station table contains a table of fallback rates
2886  * for automatic fallback during transmission.
2887  *
2888  * NOTE: This sets up a default set of values.  These will be replaced later
2889  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2890  *       rc80211_simple.
2891  *
2892  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2893  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2894  *       which requires station table entry to exist).
2895  */
2896 static void rs_initialize_lq(struct iwl_mvm *mvm,
2897                              struct ieee80211_sta *sta,
2898                              struct iwl_lq_sta *lq_sta,
2899                              enum nl80211_band band, bool update)
2900 {
2901         struct iwl_scale_tbl_info *tbl;
2902         struct rs_rate *rate;
2903         u8 active_tbl = 0;
2904
2905         if (!sta || !lq_sta)
2906                 return;
2907
2908         if (!lq_sta->search_better_tbl)
2909                 active_tbl = lq_sta->active_tbl;
2910         else
2911                 active_tbl = 1 - lq_sta->active_tbl;
2912
2913         tbl = &(lq_sta->lq_info[active_tbl]);
2914         rate = &tbl->rate;
2915
2916         rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2917         rs_init_optimal_rate(mvm, sta, lq_sta);
2918
2919         WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2920                   "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2921                   rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2922                   mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2923
2924         tbl->column = rs_get_column_from_rate(rate);
2925
2926         rs_set_expected_tpt_table(lq_sta, tbl);
2927         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2928         /* TODO restore station should remember the lq cmd */
2929         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, !update);
2930 }
2931
2932 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
2933                             void *mvm_sta,
2934                             struct ieee80211_tx_rate_control *txrc)
2935 {
2936         struct iwl_op_mode *op_mode = mvm_r;
2937         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2938         struct sk_buff *skb = txrc->skb;
2939         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2940         struct iwl_lq_sta *lq_sta;
2941         struct rs_rate *optimal_rate;
2942         u32 last_ucode_rate;
2943
2944         if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2945                 /* if vif isn't initialized mvm doesn't know about
2946                  * this station, so don't do anything with the it
2947                  */
2948                 sta = NULL;
2949                 mvm_sta = NULL;
2950         }
2951
2952         if (!mvm_sta)
2953                 return;
2954
2955         lq_sta = mvm_sta;
2956         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2957                                   info->band, &info->control.rates[0]);
2958         info->control.rates[0].count = 1;
2959
2960         /* Report the optimal rate based on rssi and STA caps if we haven't
2961          * converged yet (too little traffic) or exploring other modulations
2962          */
2963         if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2964                 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2965                 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2966                                                           optimal_rate);
2967                 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2968                                           &txrc->reported_rate);
2969         }
2970 }
2971
2972 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2973                               gfp_t gfp)
2974 {
2975         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2976         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2977         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2978         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2979
2980         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2981
2982         lq_sta->pers.drv = mvm;
2983 #ifdef CONFIG_MAC80211_DEBUGFS
2984         lq_sta->pers.dbg_fixed_rate = 0;
2985         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2986         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2987 #endif
2988         lq_sta->pers.chains = 0;
2989         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2990         lq_sta->pers.last_rssi = S8_MIN;
2991
2992         return lq_sta;
2993 }
2994
2995 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2996                                        int nss)
2997 {
2998         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2999                 (0x3 << (2 * (nss - 1)));
3000         rx_mcs >>= (2 * (nss - 1));
3001
3002         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
3003                 return IWL_RATE_MCS_7_INDEX;
3004         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
3005                 return IWL_RATE_MCS_8_INDEX;
3006         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
3007                 return IWL_RATE_MCS_9_INDEX;
3008
3009         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
3010         return -1;
3011 }
3012
3013 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
3014                                      struct ieee80211_sta_vht_cap *vht_cap,
3015                                      struct iwl_lq_sta *lq_sta)
3016 {
3017         int i;
3018         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
3019
3020         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
3021                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
3022                         if (i == IWL_RATE_9M_INDEX)
3023                                 continue;
3024
3025                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
3026                         if (i == IWL_RATE_MCS_9_INDEX &&
3027                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
3028                                 continue;
3029
3030                         lq_sta->active_siso_rate |= BIT(i);
3031                 }
3032         }
3033
3034         if (sta->rx_nss < 2)
3035                 return;
3036
3037         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
3038         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
3039                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
3040                         if (i == IWL_RATE_9M_INDEX)
3041                                 continue;
3042
3043                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
3044                         if (i == IWL_RATE_MCS_9_INDEX &&
3045                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
3046                                 continue;
3047
3048                         lq_sta->active_mimo2_rate |= BIT(i);
3049                 }
3050         }
3051 }
3052
3053 static void rs_ht_init(struct iwl_mvm *mvm,
3054                        struct ieee80211_sta *sta,
3055                        struct iwl_lq_sta *lq_sta,
3056                        struct ieee80211_sta_ht_cap *ht_cap)
3057 {
3058         /* active_siso_rate mask includes 9 MBits (bit 5),
3059          * and CCK (bits 0-3), supp_rates[] does not;
3060          * shift to convert format, force 9 MBits off.
3061          */
3062         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
3063         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
3064         lq_sta->active_siso_rate &= ~((u16)0x2);
3065         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
3066
3067         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
3068         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
3069         lq_sta->active_mimo2_rate &= ~((u16)0x2);
3070         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
3071
3072         if (mvm->cfg->ht_params->ldpc &&
3073             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
3074                 lq_sta->ldpc = true;
3075
3076         if (mvm->cfg->ht_params->stbc &&
3077             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3078             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3079                 lq_sta->stbc_capable = true;
3080
3081         lq_sta->is_vht = false;
3082 }
3083
3084 static void rs_vht_init(struct iwl_mvm *mvm,
3085                         struct ieee80211_sta *sta,
3086                         struct iwl_lq_sta *lq_sta,
3087                         struct ieee80211_sta_vht_cap *vht_cap)
3088 {
3089         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
3090
3091         if (mvm->cfg->ht_params->ldpc &&
3092             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3093                 lq_sta->ldpc = true;
3094
3095         if (mvm->cfg->ht_params->stbc &&
3096             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3097             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3098                 lq_sta->stbc_capable = true;
3099
3100         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3101             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3102             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3103                 lq_sta->bfer_capable = true;
3104
3105         lq_sta->is_vht = true;
3106 }
3107
3108 #ifdef CONFIG_IWLWIFI_DEBUGFS
3109 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3110 {
3111         spin_lock_bh(&mvm->drv_stats_lock);
3112         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3113         spin_unlock_bh(&mvm->drv_stats_lock);
3114 }
3115
3116 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3117 {
3118         u8 nss = 0;
3119
3120         spin_lock(&mvm->drv_stats_lock);
3121
3122         if (agg)
3123                 mvm->drv_rx_stats.agg_frames++;
3124
3125         mvm->drv_rx_stats.success_frames++;
3126
3127         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3128         case RATE_MCS_CHAN_WIDTH_20:
3129                 mvm->drv_rx_stats.bw_20_frames++;
3130                 break;
3131         case RATE_MCS_CHAN_WIDTH_40:
3132                 mvm->drv_rx_stats.bw_40_frames++;
3133                 break;
3134         case RATE_MCS_CHAN_WIDTH_80:
3135                 mvm->drv_rx_stats.bw_80_frames++;
3136                 break;
3137         case RATE_MCS_CHAN_WIDTH_160:
3138                 mvm->drv_rx_stats.bw_160_frames++;
3139                 break;
3140         default:
3141                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3142         }
3143
3144         if (rate & RATE_MCS_HT_MSK) {
3145                 mvm->drv_rx_stats.ht_frames++;
3146                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3147         } else if (rate & RATE_MCS_VHT_MSK) {
3148                 mvm->drv_rx_stats.vht_frames++;
3149                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3150                        RATE_VHT_MCS_NSS_POS) + 1;
3151         } else {
3152                 mvm->drv_rx_stats.legacy_frames++;
3153         }
3154
3155         if (nss == 1)
3156                 mvm->drv_rx_stats.siso_frames++;
3157         else if (nss == 2)
3158                 mvm->drv_rx_stats.mimo2_frames++;
3159
3160         if (rate & RATE_MCS_SGI_MSK)
3161                 mvm->drv_rx_stats.sgi_frames++;
3162         else
3163                 mvm->drv_rx_stats.ngi_frames++;
3164
3165         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3166         mvm->drv_rx_stats.last_frame_idx =
3167                 (mvm->drv_rx_stats.last_frame_idx + 1) %
3168                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3169
3170         spin_unlock(&mvm->drv_stats_lock);
3171 }
3172 #endif
3173
3174 /*
3175  * Called after adding a new station to initialize rate scaling
3176  */
3177 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3178                              enum nl80211_band band, bool update)
3179 {
3180         int i, j;
3181         struct ieee80211_hw *hw = mvm->hw;
3182         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3183         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3184         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3185         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
3186         struct ieee80211_supported_band *sband;
3187         unsigned long supp; /* must be unsigned long for for_each_set_bit */
3188
3189         /* clear all non-persistent lq data */
3190         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3191
3192         sband = hw->wiphy->bands[band];
3193
3194         lq_sta->lq.sta_id = mvmsta->sta_id;
3195         mvmsta->amsdu_enabled = 0;
3196         mvmsta->max_amsdu_len = sta->max_amsdu_len;
3197
3198         for (j = 0; j < LQ_SIZE; j++)
3199                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3200
3201         lq_sta->flush_timer = 0;
3202         lq_sta->last_tx = jiffies;
3203
3204         IWL_DEBUG_RATE(mvm,
3205                        "LQ: *** rate scale station global init for station %d ***\n",
3206                        mvmsta->sta_id);
3207         /* TODO: what is a good starting rate for STA? About middle? Maybe not
3208          * the lowest or the highest rate.. Could consider using RSSI from
3209          * previous packets? Need to have IEEE 802.1X auth succeed immediately
3210          * after assoc.. */
3211
3212         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3213         lq_sta->band = sband->band;
3214         /*
3215          * active legacy rates as per supported rates bitmap
3216          */
3217         supp = sta->supp_rates[sband->band];
3218         lq_sta->active_legacy_rate = 0;
3219         for_each_set_bit(i, &supp, BITS_PER_LONG)
3220                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3221
3222         /* TODO: should probably account for rx_highest for both HT/VHT */
3223         if (!vht_cap || !vht_cap->vht_supported)
3224                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3225         else
3226                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3227
3228         lq_sta->max_legacy_rate_idx =
3229                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3230         lq_sta->max_siso_rate_idx =
3231                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3232         lq_sta->max_mimo2_rate_idx =
3233                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3234
3235         IWL_DEBUG_RATE(mvm,
3236                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3237                        lq_sta->active_legacy_rate,
3238                        lq_sta->active_siso_rate,
3239                        lq_sta->active_mimo2_rate,
3240                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3241                        lq_sta->bfer_capable);
3242         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3243                        lq_sta->max_legacy_rate_idx,
3244                        lq_sta->max_siso_rate_idx,
3245                        lq_sta->max_mimo2_rate_idx);
3246
3247         /* These values will be overridden later */
3248         lq_sta->lq.single_stream_ant_msk =
3249                 iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm));
3250         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3251
3252         /* as default allow aggregation for all tids */
3253         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3254         lq_sta->is_agg = 0;
3255 #ifdef CONFIG_IWLWIFI_DEBUGFS
3256         iwl_mvm_reset_frame_stats(mvm);
3257 #endif
3258         rs_initialize_lq(mvm, sta, lq_sta, band, update);
3259 }
3260
3261 static void rs_drv_rate_update(void *mvm_r,
3262                                struct ieee80211_supported_band *sband,
3263                                struct cfg80211_chan_def *chandef,
3264                                struct ieee80211_sta *sta,
3265                                void *priv_sta, u32 changed)
3266 {
3267         struct iwl_op_mode *op_mode = mvm_r;
3268         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3269         u8 tid;
3270
3271         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3272                 return;
3273
3274         /* Stop any ongoing aggregations as rs starts off assuming no agg */
3275         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3276                 ieee80211_stop_tx_ba_session(sta, tid);
3277
3278         iwl_mvm_rs_rate_init(mvm, sta, sband->band, true);
3279 }
3280
3281 #ifdef CONFIG_MAC80211_DEBUGFS
3282 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3283                                             struct iwl_lq_cmd *lq_cmd,
3284                                             enum nl80211_band band,
3285                                             u32 ucode_rate)
3286 {
3287         struct rs_rate rate;
3288         int i;
3289         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3290         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3291         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3292
3293         for (i = 0; i < num_rates; i++)
3294                 lq_cmd->rs_table[i] = ucode_rate_le32;
3295
3296         if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3297                 WARN_ON_ONCE(1);
3298                 return;
3299         }
3300
3301         if (is_mimo(&rate))
3302                 lq_cmd->mimo_delim = num_rates - 1;
3303         else
3304                 lq_cmd->mimo_delim = 0;
3305
3306         lq_cmd->reduced_tpc = 0;
3307
3308         if (num_of_ant(ant) == 1)
3309                 lq_cmd->single_stream_ant_msk = ant;
3310
3311         if (!mvm->trans->cfg->gen2)
3312                 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3313         else
3314                 lq_cmd->agg_frame_cnt_limit =
3315                         LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3316 }
3317 #endif /* CONFIG_MAC80211_DEBUGFS */
3318
3319 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3320                                      struct iwl_lq_sta *lq_sta,
3321                                      struct rs_rate *rate,
3322                                      __le32 *rs_table, int *rs_table_index,
3323                                      int num_rates, int num_retries,
3324                                      u8 valid_tx_ant, bool toggle_ant)
3325 {
3326         int i, j;
3327         __le32 ucode_rate;
3328         bool bottom_reached = false;
3329         int prev_rate_idx = rate->index;
3330         int end = LINK_QUAL_MAX_RETRY_NUM;
3331         int index = *rs_table_index;
3332
3333         for (i = 0; i < num_rates && index < end; i++) {
3334                 for (j = 0; j < num_retries && index < end; j++, index++) {
3335                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3336                                                                          rate));
3337                         rs_table[index] = ucode_rate;
3338                         if (toggle_ant)
3339                                 rs_toggle_antenna(valid_tx_ant, rate);
3340                 }
3341
3342                 prev_rate_idx = rate->index;
3343                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3344                 if (bottom_reached && !is_legacy(rate))
3345                         break;
3346         }
3347
3348         if (!bottom_reached && !is_legacy(rate))
3349                 rate->index = prev_rate_idx;
3350
3351         *rs_table_index = index;
3352 }
3353
3354 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3355  * column the rate table should look like this:
3356  *
3357  * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3358  * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3359  * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3360  * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3361  * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3362  * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3363  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3364  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3365  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3366  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3367  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3368  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3369  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3370  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3371  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3372  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3373  */
3374 static void rs_build_rates_table(struct iwl_mvm *mvm,
3375                                  struct ieee80211_sta *sta,
3376                                  struct iwl_lq_sta *lq_sta,
3377                                  const struct rs_rate *initial_rate)
3378 {
3379         struct rs_rate rate;
3380         int num_rates, num_retries, index = 0;
3381         u8 valid_tx_ant = 0;
3382         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3383         bool toggle_ant = false;
3384         u32 color;
3385
3386         memcpy(&rate, initial_rate, sizeof(rate));
3387
3388         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3389
3390         /* TODO: remove old API when min FW API hits 14 */
3391         if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3392             rs_stbc_allow(mvm, sta, lq_sta))
3393                 rate.stbc = true;
3394
3395         if (is_siso(&rate)) {
3396                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3397                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3398         } else if (is_mimo(&rate)) {
3399                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3400                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3401         } else {
3402                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3403                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3404                 toggle_ant = true;
3405         }
3406
3407         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3408                                  num_rates, num_retries, valid_tx_ant,
3409                                  toggle_ant);
3410
3411         rs_get_lower_rate_down_column(lq_sta, &rate);
3412
3413         if (is_siso(&rate)) {
3414                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3415                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3416                 lq_cmd->mimo_delim = index;
3417         } else if (is_legacy(&rate)) {
3418                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3419                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3420         } else {
3421                 WARN_ON_ONCE(1);
3422         }
3423
3424         toggle_ant = true;
3425
3426         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3427                                  num_rates, num_retries, valid_tx_ant,
3428                                  toggle_ant);
3429
3430         rs_get_lower_rate_down_column(lq_sta, &rate);
3431
3432         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3433         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3434
3435         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3436                                  num_rates, num_retries, valid_tx_ant,
3437                                  toggle_ant);
3438
3439         /* update the color of the LQ command (as a counter at bits 1-3) */
3440         color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3441         lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3442 }
3443
3444 struct rs_bfer_active_iter_data {
3445         struct ieee80211_sta *exclude_sta;
3446         struct iwl_mvm_sta *bfer_mvmsta;
3447 };
3448
3449 static void rs_bfer_active_iter(void *_data,
3450                                 struct ieee80211_sta *sta)
3451 {
3452         struct rs_bfer_active_iter_data *data = _data;
3453         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3454         struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq;
3455         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3456
3457         if (sta == data->exclude_sta)
3458                 return;
3459
3460         /* The current sta has BFER allowed */
3461         if (ss_params & LQ_SS_BFER_ALLOWED) {
3462                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3463
3464                 data->bfer_mvmsta = mvmsta;
3465         }
3466 }
3467
3468 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3469 {
3470         int prio = -1;
3471         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3472
3473         switch (viftype) {
3474         case NL80211_IFTYPE_AP:
3475         case NL80211_IFTYPE_P2P_GO:
3476                 prio = 3;
3477                 break;
3478         case NL80211_IFTYPE_P2P_CLIENT:
3479                 prio = 2;
3480                 break;
3481         case NL80211_IFTYPE_STATION:
3482                 prio = 1;
3483                 break;
3484         default:
3485                 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3486                 prio = -1;
3487         }
3488
3489         return prio;
3490 }
3491
3492 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3493 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3494                                 struct iwl_mvm_sta *sta2)
3495 {
3496         int prio1 = rs_bfer_priority(sta1);
3497         int prio2 = rs_bfer_priority(sta2);
3498
3499         if (prio1 > prio2)
3500                 return 1;
3501         if (prio1 < prio2)
3502                 return -1;
3503         return 0;
3504 }
3505
3506 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3507                                 struct ieee80211_sta *sta,
3508                                 struct iwl_lq_sta *lq_sta,
3509                                 const struct rs_rate *initial_rate)
3510 {
3511         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3512         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3513         struct rs_bfer_active_iter_data data = {
3514                 .exclude_sta = sta,
3515                 .bfer_mvmsta = NULL,
3516         };
3517         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3518         u32 ss_params = LQ_SS_PARAMS_VALID;
3519
3520         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3521                 goto out;
3522
3523 #ifdef CONFIG_MAC80211_DEBUGFS
3524         /* Check if forcing the decision is configured.
3525          * Note that SISO is forced by not allowing STBC or BFER
3526          */
3527         if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3528                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3529         else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3530                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3531
3532         if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3533                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3534                                lq_sta->pers.ss_force);
3535                 goto out;
3536         }
3537 #endif
3538
3539         if (lq_sta->stbc_capable)
3540                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3541
3542         if (!lq_sta->bfer_capable)
3543                 goto out;
3544
3545         ieee80211_iterate_stations_atomic(mvm->hw,
3546                                           rs_bfer_active_iter,
3547                                           &data);
3548         bfer_mvmsta = data.bfer_mvmsta;
3549
3550         /* This code is safe as it doesn't run concurrently for different
3551          * stations. This is guaranteed by the fact that calls to
3552          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3553          */
3554         if (!bfer_mvmsta) {
3555                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3556
3557                 ss_params |= LQ_SS_BFER_ALLOWED;
3558                 goto out;
3559         }
3560
3561         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3562                        bfer_mvmsta->sta_id);
3563
3564         /* Disallow BFER on another STA if active and we're a higher priority */
3565         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3566                 struct iwl_lq_cmd *bfersta_lq_cmd =
3567                         &bfer_mvmsta->lq_sta.rs_drv.lq;
3568                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3569
3570                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3571                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3572                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3573
3574                 ss_params |= LQ_SS_BFER_ALLOWED;
3575                 IWL_DEBUG_RATE(mvm,
3576                                "Lower priority BFER sta found (%d). Switch BFER\n",
3577                                bfer_mvmsta->sta_id);
3578         }
3579 out:
3580         lq_cmd->ss_params = cpu_to_le32(ss_params);
3581 }
3582
3583 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3584                            struct ieee80211_sta *sta,
3585                            struct iwl_lq_sta *lq_sta,
3586                            const struct rs_rate *initial_rate)
3587 {
3588         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3589         struct iwl_mvm_sta *mvmsta;
3590         struct iwl_mvm_vif *mvmvif;
3591
3592         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3593         lq_cmd->agg_time_limit =
3594                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3595
3596 #ifdef CONFIG_MAC80211_DEBUGFS
3597         if (lq_sta->pers.dbg_fixed_rate) {
3598                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3599                                                 lq_sta->band,
3600                                                 lq_sta->pers.dbg_fixed_rate);
3601                 return;
3602         }
3603 #endif
3604         if (WARN_ON_ONCE(!sta || !initial_rate))
3605                 return;
3606
3607         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3608
3609         if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3610                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3611
3612         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3613         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3614
3615         if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) &&
3616             num_of_ant(initial_rate->ant) == 1)
3617                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3618
3619         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3620
3621         /*
3622          * In case of low latency, tell the firmware to leave a frame in the
3623          * Tx Fifo so that it can start a transaction in the same TxOP. This
3624          * basically allows the firmware to send bursts.
3625          */
3626         if (iwl_mvm_vif_low_latency(mvmvif))
3627                 lq_cmd->agg_frame_cnt_limit--;
3628
3629         if (mvmsta->vif->p2p)
3630                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3631
3632         lq_cmd->agg_time_limit =
3633                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3634 }
3635
3636 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3637 {
3638         return hw->priv;
3639 }
3640
3641 /* rate scale requires free function to be implemented */
3642 static void rs_free(void *mvm_rate)
3643 {
3644         return;
3645 }
3646
3647 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
3648 {
3649         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3650         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3651
3652         IWL_DEBUG_RATE(mvm, "enter\n");
3653         IWL_DEBUG_RATE(mvm, "leave\n");
3654 }
3655
3656 #ifdef CONFIG_MAC80211_DEBUGFS
3657 int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate)
3658 {
3659
3660         char *type, *bw;
3661         u8 mcs = 0, nss = 0;
3662         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3663
3664         if (!(rate & RATE_MCS_HT_MSK) &&
3665             !(rate & RATE_MCS_VHT_MSK) &&
3666             !(rate & RATE_MCS_HE_MSK)) {
3667                 int index = iwl_hwrate_to_plcp_idx(rate);
3668
3669                 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps\n",
3670                                  rs_pretty_ant(ant),
3671                                  index == IWL_RATE_INVALID ? "BAD" :
3672                                  iwl_rate_mcs[index].mbps);
3673         }
3674
3675         if (rate & RATE_MCS_VHT_MSK) {
3676                 type = "VHT";
3677                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3678                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3679                        >> RATE_VHT_MCS_NSS_POS) + 1;
3680         } else if (rate & RATE_MCS_HT_MSK) {
3681                 type = "HT";
3682                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3683                 nss = ((rate & RATE_HT_MCS_NSS_MSK)
3684                        >> RATE_HT_MCS_NSS_POS) + 1;
3685         } else if (rate & RATE_MCS_HE_MSK) {
3686                 type = "HE";
3687                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3688                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3689                        >> RATE_VHT_MCS_NSS_POS) + 1;
3690         } else {
3691                 type = "Unknown"; /* shouldn't happen */
3692         }
3693
3694         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3695         case RATE_MCS_CHAN_WIDTH_20:
3696                 bw = "20Mhz";
3697                 break;
3698         case RATE_MCS_CHAN_WIDTH_40:
3699                 bw = "40Mhz";
3700                 break;
3701         case RATE_MCS_CHAN_WIDTH_80:
3702                 bw = "80Mhz";
3703                 break;
3704         case RATE_MCS_CHAN_WIDTH_160:
3705                 bw = "160Mhz";
3706                 break;
3707         default:
3708                 bw = "BAD BW";
3709         }
3710
3711         return scnprintf(buf, bufsz,
3712                          "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n",
3713                          type, rs_pretty_ant(ant), bw, mcs, nss,
3714                          (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3715                          (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3716                          (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3717                          (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3718 }
3719
3720 /**
3721  * Program the device to use fixed rate for frame transmit
3722  * This is for debugging/testing only
3723  * once the device start use fixed rate, we need to reload the module
3724  * to being back the normal operation.
3725  */
3726 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3727                                 struct iwl_lq_sta *lq_sta)
3728 {
3729         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3730         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3731         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3732
3733         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3734                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3735
3736         if (lq_sta->pers.dbg_fixed_rate) {
3737                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3738                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3739         }
3740 }
3741
3742 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3743                         const char __user *user_buf, size_t count, loff_t *ppos)
3744 {
3745         struct iwl_lq_sta *lq_sta = file->private_data;
3746         struct iwl_mvm *mvm;
3747         char buf[64];
3748         size_t buf_size;
3749         u32 parsed_rate;
3750
3751         mvm = lq_sta->pers.drv;
3752         memset(buf, 0, sizeof(buf));
3753         buf_size = min(count, sizeof(buf) -  1);
3754         if (copy_from_user(buf, user_buf, buf_size))
3755                 return -EFAULT;
3756
3757         if (sscanf(buf, "%x", &parsed_rate) == 1)
3758                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3759         else
3760                 lq_sta->pers.dbg_fixed_rate = 0;
3761
3762         rs_program_fix_rate(mvm, lq_sta);
3763
3764         return count;
3765 }
3766
3767 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3768                         char __user *user_buf, size_t count, loff_t *ppos)
3769 {
3770         char *buff;
3771         int desc = 0;
3772         int i = 0;
3773         ssize_t ret;
3774         static const size_t bufsz = 2048;
3775
3776         struct iwl_lq_sta *lq_sta = file->private_data;
3777         struct iwl_mvm_sta *mvmsta =
3778                 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
3779         struct iwl_mvm *mvm;
3780         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3781         struct rs_rate *rate = &tbl->rate;
3782         u32 ss_params;
3783
3784         mvm = lq_sta->pers.drv;
3785         buff = kmalloc(bufsz, GFP_KERNEL);
3786         if (!buff)
3787                 return -ENOMEM;
3788
3789         desc += scnprintf(buff + desc, bufsz - desc,
3790                           "sta_id %d\n", lq_sta->lq.sta_id);
3791         desc += scnprintf(buff + desc, bufsz - desc,
3792                           "failed=%d success=%d rate=0%lX\n",
3793                           lq_sta->total_failed, lq_sta->total_success,
3794                           lq_sta->active_legacy_rate);
3795         desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
3796                           lq_sta->pers.dbg_fixed_rate);
3797         desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n",
3798             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3799             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3800             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3801         desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
3802                           (is_legacy(rate)) ? "legacy" :
3803                           is_vht(rate) ? "VHT" : "HT");
3804         if (!is_legacy(rate)) {
3805                 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3806                    (is_siso(rate)) ? "SISO" : "MIMO2");
3807                 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3808                                 (is_ht20(rate)) ? "20MHz" :
3809                                 (is_ht40(rate)) ? "40MHz" :
3810                                 (is_ht80(rate)) ? "80MHz" :
3811                                 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3812                 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
3813                                 (rate->sgi) ? "SGI" : "NGI",
3814                                 (rate->ldpc) ? "LDPC" : "BCC",
3815                                 (lq_sta->is_agg) ? "AGG on" : "",
3816                                 (mvmsta->amsdu_enabled) ? "AMSDU on" : "");
3817         }
3818         desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
3819                         lq_sta->last_rate_n_flags);
3820         desc += scnprintf(buff + desc, bufsz - desc,
3821                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3822                         lq_sta->lq.flags,
3823                         lq_sta->lq.mimo_delim,
3824                         lq_sta->lq.single_stream_ant_msk,
3825                         lq_sta->lq.dual_stream_ant_msk);
3826
3827         desc += scnprintf(buff + desc, bufsz - desc,
3828                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3829                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3830                         lq_sta->lq.agg_disable_start_th,
3831                         lq_sta->lq.agg_frame_cnt_limit);
3832
3833         desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
3834                           lq_sta->lq.reduced_tpc);
3835         ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3836         desc += scnprintf(buff + desc, bufsz - desc,
3837                         "single stream params: %s%s%s%s\n",
3838                         (ss_params & LQ_SS_PARAMS_VALID) ?
3839                         "VALID" : "INVALID",
3840                         (ss_params & LQ_SS_BFER_ALLOWED) ?
3841                         ", BFER" : "",
3842                         (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3843                         ", STBC" : "",
3844                         (ss_params & LQ_SS_FORCE) ?
3845                         ", FORCE" : "");
3846         desc += scnprintf(buff + desc, bufsz - desc,
3847                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3848                         lq_sta->lq.initial_rate_index[0],
3849                         lq_sta->lq.initial_rate_index[1],
3850                         lq_sta->lq.initial_rate_index[2],
3851                         lq_sta->lq.initial_rate_index[3]);
3852
3853         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3854                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3855
3856                 desc += scnprintf(buff + desc, bufsz - desc,
3857                                   " rate[%d] 0x%X ", i, r);
3858                 desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r);
3859         }
3860
3861         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3862         kfree(buff);
3863         return ret;
3864 }
3865
3866 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3867         .write = rs_sta_dbgfs_scale_table_write,
3868         .read = rs_sta_dbgfs_scale_table_read,
3869         .open = simple_open,
3870         .llseek = default_llseek,
3871 };
3872 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3873                         char __user *user_buf, size_t count, loff_t *ppos)
3874 {
3875         char *buff;
3876         int desc = 0;
3877         int i, j;
3878         ssize_t ret;
3879         struct iwl_scale_tbl_info *tbl;
3880         struct rs_rate *rate;
3881         struct iwl_lq_sta *lq_sta = file->private_data;
3882
3883         buff = kmalloc(1024, GFP_KERNEL);
3884         if (!buff)
3885                 return -ENOMEM;
3886
3887         for (i = 0; i < LQ_SIZE; i++) {
3888                 tbl = &(lq_sta->lq_info[i]);
3889                 rate = &tbl->rate;
3890                 desc += sprintf(buff+desc,
3891                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3892                                 "index=%d\n",
3893                                 lq_sta->active_tbl == i ? "*" : "x",
3894                                 rate->type,
3895                                 rate->sgi,
3896                                 is_ht20(rate) ? "20MHz" :
3897                                 is_ht40(rate) ? "40MHz" :
3898                                 is_ht80(rate) ? "80MHz" :
3899                                 is_ht160(rate) ? "160MHz" : "ERR",
3900                                 rate->index);
3901                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3902                         desc += sprintf(buff+desc,
3903                                 "counter=%d success=%d %%=%d\n",
3904                                 tbl->win[j].counter,
3905                                 tbl->win[j].success_counter,
3906                                 tbl->win[j].success_ratio);
3907                 }
3908         }
3909         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3910         kfree(buff);
3911         return ret;
3912 }
3913
3914 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3915         .read = rs_sta_dbgfs_stats_table_read,
3916         .open = simple_open,
3917         .llseek = default_llseek,
3918 };
3919
3920 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3921                                               char __user *user_buf,
3922                                               size_t count, loff_t *ppos)
3923 {
3924         static const char * const column_name[] = {
3925                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3926                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3927                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3928                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3929                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3930                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3931                 [RS_COLUMN_MIMO2] = "MIMO2",
3932                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3933         };
3934
3935         static const char * const rate_name[] = {
3936                 [IWL_RATE_1M_INDEX] = "1M",
3937                 [IWL_RATE_2M_INDEX] = "2M",
3938                 [IWL_RATE_5M_INDEX] = "5.5M",
3939                 [IWL_RATE_11M_INDEX] = "11M",
3940                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3941                 [IWL_RATE_9M_INDEX] = "9M",
3942                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3943                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3944                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3945                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3946                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3947                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3948                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3949                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3950                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3951                 [IWL_RATE_MCS_10_INDEX] = "MCS10",
3952                 [IWL_RATE_MCS_11_INDEX] = "MCS11",
3953         };
3954
3955         char *buff, *pos, *endpos;
3956         int col, rate;
3957         ssize_t ret;
3958         struct iwl_lq_sta *lq_sta = file->private_data;
3959         struct rs_rate_stats *stats;
3960         static const size_t bufsz = 1024;
3961
3962         buff = kmalloc(bufsz, GFP_KERNEL);
3963         if (!buff)
3964                 return -ENOMEM;
3965
3966         pos = buff;
3967         endpos = pos + bufsz;
3968
3969         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3970         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3971                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3972         pos += scnprintf(pos, endpos - pos, "\n");
3973
3974         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3975                 pos += scnprintf(pos, endpos - pos,
3976                                  "%s,", column_name[col]);
3977
3978                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3979                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3980                         pos += scnprintf(pos, endpos - pos,
3981                                          "%llu/%llu,",
3982                                          stats->success,
3983                                          stats->total);
3984                 }
3985                 pos += scnprintf(pos, endpos - pos, "\n");
3986         }
3987
3988         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3989         kfree(buff);
3990         return ret;
3991 }
3992
3993 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3994                                                const char __user *user_buf,
3995                                                size_t count, loff_t *ppos)
3996 {
3997         struct iwl_lq_sta *lq_sta = file->private_data;
3998         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3999
4000         return count;
4001 }
4002
4003 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
4004         .read = rs_sta_dbgfs_drv_tx_stats_read,
4005         .write = rs_sta_dbgfs_drv_tx_stats_write,
4006         .open = simple_open,
4007         .llseek = default_llseek,
4008 };
4009
4010 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
4011                                        char __user *user_buf,
4012                                        size_t count, loff_t *ppos)
4013 {
4014         struct iwl_lq_sta *lq_sta = file->private_data;
4015         char buf[12];
4016         int bufsz = sizeof(buf);
4017         int pos = 0;
4018         static const char * const ss_force_name[] = {
4019                 [RS_SS_FORCE_NONE] = "none",
4020                 [RS_SS_FORCE_STBC] = "stbc",
4021                 [RS_SS_FORCE_BFER] = "bfer",
4022                 [RS_SS_FORCE_SISO] = "siso",
4023         };
4024
4025         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
4026                          ss_force_name[lq_sta->pers.ss_force]);
4027         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
4028 }
4029
4030 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
4031                                         size_t count, loff_t *ppos)
4032 {
4033         struct iwl_mvm *mvm = lq_sta->pers.drv;
4034         int ret = 0;
4035
4036         if (!strncmp("none", buf, 4)) {
4037                 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
4038         } else if (!strncmp("siso", buf, 4)) {
4039                 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
4040         } else if (!strncmp("stbc", buf, 4)) {
4041                 if (lq_sta->stbc_capable) {
4042                         lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
4043                 } else {
4044                         IWL_ERR(mvm,
4045                                 "can't force STBC. peer doesn't support\n");
4046                         ret = -EINVAL;
4047                 }
4048         } else if (!strncmp("bfer", buf, 4)) {
4049                 if (lq_sta->bfer_capable) {
4050                         lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4051                 } else {
4052                         IWL_ERR(mvm,
4053                                 "can't force BFER. peer doesn't support\n");
4054                         ret = -EINVAL;
4055                 }
4056         } else {
4057                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4058                 ret = -EINVAL;
4059         }
4060         return ret ?: count;
4061 }
4062
4063 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4064         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4065 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
4066                 debugfs_create_file(#name, mode, parent, lq_sta,        \
4067                                     &iwl_dbgfs_##name##_ops);           \
4068         } while (0)
4069
4070 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4071
4072 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
4073                                    struct dentry *dir)
4074 {
4075         struct iwl_lq_sta *lq_sta = priv_sta;
4076         struct iwl_mvm_sta *mvmsta;
4077
4078         mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
4079
4080         if (!mvmsta->vif)
4081                 return;
4082
4083         debugfs_create_file("rate_scale_table", 0600, dir,
4084                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
4085         debugfs_create_file("rate_stats_table", 0400, dir,
4086                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
4087         debugfs_create_file("drv_tx_stats", 0600, dir,
4088                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4089         debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
4090                           &lq_sta->tx_agg_tid_en);
4091         debugfs_create_u8("reduced_tpc", 0600, dir,
4092                           &lq_sta->pers.dbg_fixed_txp_reduction);
4093
4094         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
4095 }
4096
4097 void rs_remove_sta_debugfs(void *mvm, void *mvm_sta)
4098 {
4099 }
4100 #endif
4101
4102 /*
4103  * Initialization of rate scaling information is done by driver after
4104  * the station is added. Since mac80211 calls this function before a
4105  * station is added we ignore it.
4106  */
4107 static void rs_rate_init_ops(void *mvm_r,
4108                              struct ieee80211_supported_band *sband,
4109                              struct cfg80211_chan_def *chandef,
4110                              struct ieee80211_sta *sta, void *mvm_sta)
4111 {
4112 }
4113
4114 /* ops for rate scaling implemented in the driver */
4115 static const struct rate_control_ops rs_mvm_ops_drv = {
4116         .name = RS_NAME,
4117         .tx_status = rs_drv_mac80211_tx_status,
4118         .get_rate = rs_drv_get_rate,
4119         .rate_init = rs_rate_init_ops,
4120         .alloc = rs_alloc,
4121         .free = rs_free,
4122         .alloc_sta = rs_drv_alloc_sta,
4123         .free_sta = rs_free_sta,
4124         .rate_update = rs_drv_rate_update,
4125 #ifdef CONFIG_MAC80211_DEBUGFS
4126         .add_sta_debugfs = rs_drv_add_sta_debugfs,
4127         .remove_sta_debugfs = rs_remove_sta_debugfs,
4128 #endif
4129         .capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW,
4130 };
4131
4132 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
4133                           enum nl80211_band band, bool update)
4134 {
4135         if (iwl_mvm_has_tlc_offload(mvm))
4136                 rs_fw_rate_init(mvm, sta, band, update);
4137         else
4138                 rs_drv_rate_init(mvm, sta, band, update);
4139 }
4140
4141 int iwl_mvm_rate_control_register(void)
4142 {
4143         return ieee80211_rate_control_register(&rs_mvm_ops_drv);
4144 }
4145
4146 void iwl_mvm_rate_control_unregister(void)
4147 {
4148         ieee80211_rate_control_unregister(&rs_mvm_ops_drv);
4149 }
4150
4151 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4152                                 bool enable)
4153 {
4154         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq;
4155
4156         lockdep_assert_held(&mvm->mutex);
4157
4158         if (enable) {
4159                 if (mvmsta->tx_protection == 0)
4160                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
4161                 mvmsta->tx_protection++;
4162         } else {
4163                 mvmsta->tx_protection--;
4164                 if (mvmsta->tx_protection == 0)
4165                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4166         }
4167
4168         return iwl_mvm_send_lq_cmd(mvm, lq, false);
4169 }
4170
4171 /**
4172  * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection
4173  * @mvmsta: The station
4174  * @enable: Enable Tx protection?
4175  */
4176 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4177                           bool enable)
4178 {
4179         if (iwl_mvm_has_tlc_offload(mvm))
4180                 return rs_fw_tx_protection(mvm, mvmsta, enable);
4181         else
4182                 return rs_drv_tx_protection(mvm, mvmsta, enable);
4183 }