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

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