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  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  * The full GNU General Public License is included in this distribution in the
  21  * file called LICENSE.
  22  *
  23  * Contact Information:
  24  *  Intel Linux Wireless <linuxwifi@intel.com>
  25  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26  *
  27  *****************************************************************************/
  28 #include <linux/kernel.h>
  29 #include <linux/skbuff.h>
  30 #include <linux/slab.h>
  31 #include <net/mac80211.h>
  32
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/delay.h>
  36
  37 #include <linux/workqueue.h>
  38 #include "rs.h"
  39 #include "fw-api.h"
  40 #include "sta.h"
  41 #include "iwl-op-mode.h"
  42 #include "mvm.h"
  43 #include "debugfs.h"
  44
  45 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  46
  47 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
  48  * Use this macro when dealing with thresholds consts set as a percentage
  49  */
  50 #define RS_PERCENT(x) (128 * x)
  51
  52 static u8 rs_ht_to_legacy[] = {
  53         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  54         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  55         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  56         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  57         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  58         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  59         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  60         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  61         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  62         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  63 };
  64
  65 static const u8 ant_toggle_lookup[] = {
  66         [ANT_NONE] = ANT_NONE,
  67         [ANT_A] = ANT_B,
  68         [ANT_B] = ANT_A,
  69         [ANT_AB] = ANT_AB,
  70 };
  71
  72 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  73         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  74                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  75                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  76                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  77                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  78                                     IWL_RATE_##rp##M_INDEX,           \
  79                                     IWL_RATE_##rn##M_INDEX }
  80
  81 #define IWL_DECLARE_MCS_RATE(s)                                           \
  82         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
  83                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
  84                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
  85                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
  86                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
  87                                        IWL_RATE_INVM_INDEX,               \
  88                                        IWL_RATE_INVM_INDEX }
  89
  90 /*
  91  * Parameter order:
  92  *   rate, ht rate, prev rate, next rate
  93  *
  94  * If there isn't a valid next or previous rate then INV is used which
  95  * maps to IWL_RATE_INVALID
  96  *
  97  */
  98 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
  99         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 100         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 101         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 102         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 103         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 104         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 105         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 106         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 107         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 108         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 109         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 110         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 111         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 112         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 113         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 114 };
 115
 116 enum rs_action {
 117         RS_ACTION_STAY = 0,
 118         RS_ACTION_DOWNSCALE = -1,
 119         RS_ACTION_UPSCALE = 1,
 120 };
 121
 122 enum rs_column_mode {
 123         RS_INVALID = 0,
 124         RS_LEGACY,
 125         RS_SISO,
 126         RS_MIMO2,
 127 };
 128
 129 #define MAX_NEXT_COLUMNS 7
 130 #define MAX_COLUMN_CHECKS 3
 131
 132 struct rs_tx_column;
 133
 134 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 135                                      struct ieee80211_sta *sta,
 136                                      struct rs_rate *rate,
 137                                      const struct rs_tx_column *next_col);
 138
 139 struct rs_tx_column {
 140         enum rs_column_mode mode;
 141         u8 ant;
 142         bool sgi;
 143         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 144         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 145 };
 146
 147 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 148                          struct rs_rate *rate,
 149                          const struct rs_tx_column *next_col)
 150 {
 151         return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
 152 }
 153
 154 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 155                           struct rs_rate *rate,
 156                           const struct rs_tx_column *next_col)
 157 {
 158         if (!sta->ht_cap.ht_supported)
 159                 return false;
 160
 161         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 162                 return false;
 163
 164         if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
 165                 return false;
 166
 167         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 168                 return false;
 169
 170         if (mvm->nvm_data->sku_cap_mimo_disabled)
 171                 return false;
 172
 173         return true;
 174 }
 175
 176 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 177                           struct rs_rate *rate,
 178                           const struct rs_tx_column *next_col)
 179 {
 180         if (!sta->ht_cap.ht_supported)
 181                 return false;
 182
 183         return true;
 184 }
 185
 186 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 187                          struct rs_rate *rate,
 188                          const struct rs_tx_column *next_col)
 189 {
 190         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 191         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 192
 193         if (is_ht20(rate) && (ht_cap->cap &
 194                              IEEE80211_HT_CAP_SGI_20))
 195                 return true;
 196         if (is_ht40(rate) && (ht_cap->cap &
 197                              IEEE80211_HT_CAP_SGI_40))
 198                 return true;
 199         if (is_ht80(rate) && (vht_cap->cap &
 200                              IEEE80211_VHT_CAP_SHORT_GI_80))
 201                 return true;
 202         if (is_ht160(rate) && (vht_cap->cap &
 203                              IEEE80211_VHT_CAP_SHORT_GI_160))
 204                 return true;
 205
 206         return false;
 207 }
 208
 209 static const struct rs_tx_column rs_tx_columns[] = {
 210         [RS_COLUMN_LEGACY_ANT_A] = {
 211                 .mode = RS_LEGACY,
 212                 .ant = ANT_A,
 213                 .next_columns = {
 214                         RS_COLUMN_LEGACY_ANT_B,
 215                         RS_COLUMN_SISO_ANT_A,
 216                         RS_COLUMN_MIMO2,
 217                         RS_COLUMN_INVALID,
 218                         RS_COLUMN_INVALID,
 219                         RS_COLUMN_INVALID,
 220                         RS_COLUMN_INVALID,
 221                 },
 222                 .checks = {
 223                         rs_ant_allow,
 224                 },
 225         },
 226         [RS_COLUMN_LEGACY_ANT_B] = {
 227                 .mode = RS_LEGACY,
 228                 .ant = ANT_B,
 229                 .next_columns = {
 230                         RS_COLUMN_LEGACY_ANT_A,
 231                         RS_COLUMN_SISO_ANT_B,
 232                         RS_COLUMN_MIMO2,
 233                         RS_COLUMN_INVALID,
 234                         RS_COLUMN_INVALID,
 235                         RS_COLUMN_INVALID,
 236                         RS_COLUMN_INVALID,
 237                 },
 238                 .checks = {
 239                         rs_ant_allow,
 240                 },
 241         },
 242         [RS_COLUMN_SISO_ANT_A] = {
 243                 .mode = RS_SISO,
 244                 .ant = ANT_A,
 245                 .next_columns = {
 246                         RS_COLUMN_SISO_ANT_B,
 247                         RS_COLUMN_MIMO2,
 248                         RS_COLUMN_SISO_ANT_A_SGI,
 249                         RS_COLUMN_LEGACY_ANT_A,
 250                         RS_COLUMN_LEGACY_ANT_B,
 251                         RS_COLUMN_INVALID,
 252                         RS_COLUMN_INVALID,
 253                 },
 254                 .checks = {
 255                         rs_siso_allow,
 256                         rs_ant_allow,
 257                 },
 258         },
 259         [RS_COLUMN_SISO_ANT_B] = {
 260                 .mode = RS_SISO,
 261                 .ant = ANT_B,
 262                 .next_columns = {
 263                         RS_COLUMN_SISO_ANT_A,
 264                         RS_COLUMN_MIMO2,
 265                         RS_COLUMN_SISO_ANT_B_SGI,
 266                         RS_COLUMN_LEGACY_ANT_A,
 267                         RS_COLUMN_LEGACY_ANT_B,
 268                         RS_COLUMN_INVALID,
 269                         RS_COLUMN_INVALID,
 270                 },
 271                 .checks = {
 272                         rs_siso_allow,
 273                         rs_ant_allow,
 274                 },
 275         },
 276         [RS_COLUMN_SISO_ANT_A_SGI] = {
 277                 .mode = RS_SISO,
 278                 .ant = ANT_A,
 279                 .sgi = true,
 280                 .next_columns = {
 281                         RS_COLUMN_SISO_ANT_B_SGI,
 282                         RS_COLUMN_MIMO2_SGI,
 283                         RS_COLUMN_SISO_ANT_A,
 284                         RS_COLUMN_LEGACY_ANT_A,
 285                         RS_COLUMN_LEGACY_ANT_B,
 286                         RS_COLUMN_INVALID,
 287                         RS_COLUMN_INVALID,
 288                 },
 289                 .checks = {
 290                         rs_siso_allow,
 291                         rs_ant_allow,
 292                         rs_sgi_allow,
 293                 },
 294         },
 295         [RS_COLUMN_SISO_ANT_B_SGI] = {
 296                 .mode = RS_SISO,
 297                 .ant = ANT_B,
 298                 .sgi = true,
 299                 .next_columns = {
 300                         RS_COLUMN_SISO_ANT_A_SGI,
 301                         RS_COLUMN_MIMO2_SGI,
 302                         RS_COLUMN_SISO_ANT_B,
 303                         RS_COLUMN_LEGACY_ANT_A,
 304                         RS_COLUMN_LEGACY_ANT_B,
 305                         RS_COLUMN_INVALID,
 306                         RS_COLUMN_INVALID,
 307                 },
 308                 .checks = {
 309                         rs_siso_allow,
 310                         rs_ant_allow,
 311                         rs_sgi_allow,
 312                 },
 313         },
 314         [RS_COLUMN_MIMO2] = {
 315                 .mode = RS_MIMO2,
 316                 .ant = ANT_AB,
 317                 .next_columns = {
 318                         RS_COLUMN_SISO_ANT_A,
 319                         RS_COLUMN_MIMO2_SGI,
 320                         RS_COLUMN_LEGACY_ANT_A,
 321                         RS_COLUMN_LEGACY_ANT_B,
 322                         RS_COLUMN_INVALID,
 323                         RS_COLUMN_INVALID,
 324                         RS_COLUMN_INVALID,
 325                 },
 326                 .checks = {
 327                         rs_mimo_allow,
 328                 },
 329         },
 330         [RS_COLUMN_MIMO2_SGI] = {
 331                 .mode = RS_MIMO2,
 332                 .ant = ANT_AB,
 333                 .sgi = true,
 334                 .next_columns = {
 335                         RS_COLUMN_SISO_ANT_A_SGI,
 336                         RS_COLUMN_MIMO2,
 337                         RS_COLUMN_LEGACY_ANT_A,
 338                         RS_COLUMN_LEGACY_ANT_B,
 339                         RS_COLUMN_INVALID,
 340                         RS_COLUMN_INVALID,
 341                         RS_COLUMN_INVALID,
 342                 },
 343                 .checks = {
 344                         rs_mimo_allow,
 345                         rs_sgi_allow,
 346                 },
 347         },
 348 };
 349
 350 static inline u8 rs_extract_rate(u32 rate_n_flags)
 351 {
 352         /* also works for HT because bits 7:6 are zero there */
 353         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 354 }
 355
 356 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 357 {
 358         int idx = 0;
 359
 360         if (rate_n_flags & RATE_MCS_HT_MSK) {
 361                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 362                 idx += IWL_RATE_MCS_0_INDEX;
 363
 364                 /* skip 9M not supported in HT*/
 365                 if (idx >= IWL_RATE_9M_INDEX)
 366                         idx += 1;
 367                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 368                         return idx;
 369         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 370                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 371                 idx += IWL_RATE_MCS_0_INDEX;
 372
 373                 /* skip 9M not supported in VHT*/
 374                 if (idx >= IWL_RATE_9M_INDEX)
 375                         idx++;
 376                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 377                         return idx;
 378         } else {
 379                 /* legacy rate format, search for match in table */
 380
 381                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 382                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 383                         if (iwl_rates[idx].plcp == legacy_rate)
 384                                 return idx;
 385         }
 386
 387         return IWL_RATE_INVALID;
 388 }
 389
 390 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 391                                   struct ieee80211_sta *sta,
 392                                   struct iwl_lq_sta *lq_sta,
 393                                   int tid, bool ndp);
 394 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 395                            struct ieee80211_sta *sta,
 396                            struct iwl_lq_sta *lq_sta,
 397                            const struct rs_rate *initial_rate);
 398 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 399
 400 /**
 401  * The following tables contain the expected throughput metrics for all rates
 402  *
 403  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 404  *
 405  * where invalid entries are zeros.
 406  *
 407  * CCK rates are only valid in legacy table and will only be used in G
 408  * (2.4 GHz) band.
 409  */
 410
 411 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 412         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 413 };
 414
 415 /* Expected TpT tables. 4 indexes:
 416  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 417  */
 418 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 419         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 420         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 421         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 422         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 423 };
 424
 425 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 426         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 427         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 428         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 429         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 430 };
 431
 432 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 433         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 434         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 435         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 436         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 437 };
 438
 439 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
 440         {0, 0, 0, 0, 191, 0, 244, 288,  298,  308,  313,  318,  323,  328,  330},
 441         {0, 0, 0, 0, 200, 0, 251, 293,  302,  312,  317,  322,  327,  332,  334},
 442         {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
 443         {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
 444 };
 445
 446 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 447         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 448         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 449         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 450         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 451 };
 452
 453 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 454         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 455         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 456         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 457         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 458 };
 459
 460 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 461         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 462         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 463         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 464         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 465 };
 466
 467 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
 468         {0, 0, 0, 0, 240, 0, 278,  308,  313,  319,  322,  324,  328,  330,   334},
 469         {0, 0, 0, 0, 247, 0, 282,  310,  315,  320,  323,  325,  329,  332,   338},
 470         {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629,  10592},
 471         {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
 472 };
 473
 474 /* mbps, mcs */
 475 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 476         {  "1", "BPSK DSSS"},
 477         {  "2", "QPSK DSSS"},
 478         {"5.5", "BPSK CCK"},
 479         { "11", "QPSK CCK"},
 480         {  "6", "BPSK 1/2"},
 481         {  "9", "BPSK 1/2"},
 482         { "12", "QPSK 1/2"},
 483         { "18", "QPSK 3/4"},
 484         { "24", "16QAM 1/2"},
 485         { "36", "16QAM 3/4"},
 486         { "48", "64QAM 2/3"},
 487         { "54", "64QAM 3/4"},
 488         { "60", "64QAM 5/6"},
 489 };
 490
 491 #define MCS_INDEX_PER_STREAM    (8)
 492
 493 static const char *rs_pretty_ant(u8 ant)
 494 {
 495         static const char * const ant_name[] = {
 496                 [ANT_NONE] = "None",
 497                 [ANT_A]    = "A",
 498                 [ANT_B]    = "B",
 499                 [ANT_AB]   = "AB",
 500                 [ANT_C]    = "C",
 501                 [ANT_AC]   = "AC",
 502                 [ANT_BC]   = "BC",
 503                 [ANT_ABC]  = "ABC",
 504         };
 505
 506         if (ant > ANT_ABC)
 507                 return "UNKNOWN";
 508
 509         return ant_name[ant];
 510 }
 511
 512 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 513 {
 514         static const char * const lq_types[] = {
 515                 [LQ_NONE] = "NONE",
 516                 [LQ_LEGACY_A] = "LEGACY_A",
 517                 [LQ_LEGACY_G] = "LEGACY_G",
 518                 [LQ_HT_SISO] = "HT SISO",
 519                 [LQ_HT_MIMO2] = "HT MIMO",
 520                 [LQ_VHT_SISO] = "VHT SISO",
 521                 [LQ_VHT_MIMO2] = "VHT MIMO",
 522         };
 523
 524         if (type < LQ_NONE || type >= LQ_MAX)
 525                 return "UNKNOWN";
 526
 527         return lq_types[type];
 528 }
 529
 530 static char *rs_pretty_rate(const struct rs_rate *rate)
 531 {
 532         static char buf[40];
 533         static const char * const legacy_rates[] = {
 534                 [IWL_RATE_1M_INDEX] = "1M",
 535                 [IWL_RATE_2M_INDEX] = "2M",
 536                 [IWL_RATE_5M_INDEX] = "5.5M",
 537                 [IWL_RATE_11M_INDEX] = "11M",
 538                 [IWL_RATE_6M_INDEX] = "6M",
 539                 [IWL_RATE_9M_INDEX] = "9M",
 540                 [IWL_RATE_12M_INDEX] = "12M",
 541                 [IWL_RATE_18M_INDEX] = "18M",
 542                 [IWL_RATE_24M_INDEX] = "24M",
 543                 [IWL_RATE_36M_INDEX] = "36M",
 544                 [IWL_RATE_48M_INDEX] = "48M",
 545                 [IWL_RATE_54M_INDEX] = "54M",
 546         };
 547         static const char *const ht_vht_rates[] = {
 548                 [IWL_RATE_MCS_0_INDEX] = "MCS0",
 549                 [IWL_RATE_MCS_1_INDEX] = "MCS1",
 550                 [IWL_RATE_MCS_2_INDEX] = "MCS2",
 551                 [IWL_RATE_MCS_3_INDEX] = "MCS3",
 552                 [IWL_RATE_MCS_4_INDEX] = "MCS4",
 553                 [IWL_RATE_MCS_5_INDEX] = "MCS5",
 554                 [IWL_RATE_MCS_6_INDEX] = "MCS6",
 555                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
 556                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
 557                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
 558         };
 559         const char *rate_str;
 560
 561         if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
 562                 rate_str = legacy_rates[rate->index];
 563         else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
 564                  (rate->index >= IWL_RATE_MCS_0_INDEX) &&
 565                  (rate->index <= IWL_RATE_MCS_9_INDEX))
 566                 rate_str = ht_vht_rates[rate->index];
 567         else
 568                 rate_str = "BAD_RATE";
 569
 570         sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
 571                 rs_pretty_ant(rate->ant), rate_str);
 572         return buf;
 573 }
 574
 575 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 576                                 const char *prefix)
 577 {
 578         IWL_DEBUG_RATE(mvm,
 579                        "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
 580                        prefix, rs_pretty_rate(rate), rate->bw,
 581                        rate->sgi, rate->ldpc, rate->stbc);
 582 }
 583
 584 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 585 {
 586         window->data = 0;
 587         window->success_counter = 0;
 588         window->success_ratio = IWL_INVALID_VALUE;
 589         window->counter = 0;
 590         window->average_tpt = IWL_INVALID_VALUE;
 591 }
 592
 593 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 594                                             struct iwl_scale_tbl_info *tbl)
 595 {
 596         int i;
 597
 598         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 599         for (i = 0; i < IWL_RATE_COUNT; i++)
 600                 rs_rate_scale_clear_window(&tbl->win[i]);
 601
 602         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 603                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 604 }
 605
 606 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 607 {
 608         return (ant_type & valid_antenna) == ant_type;
 609 }
 610
 611 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 612                                      struct iwl_lq_sta *lq_data, u8 tid,
 613                                      struct ieee80211_sta *sta)
 614 {
 615         int ret = -EAGAIN;
 616
 617         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 618                      sta->addr, tid);
 619
 620         /* start BA session until the peer sends del BA */
 621         ret = ieee80211_start_tx_ba_session(sta, tid, 0);
 622         if (ret == -EAGAIN) {
 623                 /*
 624                  * driver and mac80211 is out of sync
 625                  * this might be cause by reloading firmware
 626                  * stop the tx ba session here
 627                  */
 628                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 629                         tid);
 630                 ieee80211_stop_tx_ba_session(sta, tid);
 631         }
 632         return ret;
 633 }
 634
 635 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
 636                               u8 tid, struct iwl_lq_sta *lq_sta,
 637                               struct ieee80211_sta *sta)
 638 {
 639         struct iwl_mvm_tid_data *tid_data;
 640
 641         /*
 642          * In AP mode, tid can be equal to IWL_MAX_TID_COUNT
 643          * when the frame is not QoS
 644          */
 645         if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) {
 646                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 647                         tid, IWL_MAX_TID_COUNT);
 648                 return;
 649         } else if (tid == IWL_MAX_TID_COUNT) {
 650                 return;
 651         }
 652
 653         tid_data = &mvmsta->tid_data[tid];
 654         if ((tid_data->state == IWL_AGG_OFF) &&
 655             (lq_sta->tx_agg_tid_en & BIT(tid)) &&
 656             (tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD)) {
 657                 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid);
 658                 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0)
 659                         tid_data->state = IWL_AGG_QUEUED;
 660         }
 661 }
 662
 663 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 664 {
 665         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 666                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 667                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 668 }
 669
 670 /*
 671  * Static function to get the expected throughput from an iwl_scale_tbl_info
 672  * that wraps a NULL pointer check
 673  */
 674 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 675 {
 676         if (tbl->expected_tpt)
 677                 return tbl->expected_tpt[rs_index];
 678         return 0;
 679 }
 680
 681 /**
 682  * rs_collect_tx_data - Update the success/failure sliding window
 683  *
 684  * We keep a sliding window of the last 62 packets transmitted
 685  * at this rate.  window->data contains the bitmask of successful
 686  * packets.
 687  */
 688 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
 689                                struct iwl_scale_tbl_info *tbl,
 690                                int scale_index, int attempts, int successes,
 691                                struct iwl_rate_scale_data *window)
 692 {
 693         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 694         s32 fail_count, tpt;
 695
 696         /* Get expected throughput */
 697         tpt = get_expected_tpt(tbl, scale_index);
 698
 699         /*
 700          * Keep track of only the latest 62 tx frame attempts in this rate's
 701          * history window; anything older isn't really relevant any more.
 702          * If we have filled up the sliding window, drop the oldest attempt;
 703          * if the oldest attempt (highest bit in bitmap) shows "success",
 704          * subtract "1" from the success counter (this is the main reason
 705          * we keep these bitmaps!).
 706          */
 707         while (attempts > 0) {
 708                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 709                         /* remove earliest */
 710                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 711
 712                         if (window->data & mask) {
 713                                 window->data &= ~mask;
 714                                 window->success_counter--;
 715                         }
 716                 }
 717
 718                 /* Increment frames-attempted counter */
 719                 window->counter++;
 720
 721                 /* Shift bitmap by one frame to throw away oldest history */
 722                 window->data <<= 1;
 723
 724                 /* Mark the most recent #successes attempts as successful */
 725                 if (successes > 0) {
 726                         window->success_counter++;
 727                         window->data |= 0x1;
 728                         successes--;
 729                 }
 730
 731                 attempts--;
 732         }
 733
 734         /* Calculate current success ratio, avoid divide-by-0! */
 735         if (window->counter > 0)
 736                 window->success_ratio = 128 * (100 * window->success_counter)
 737                                         / window->counter;
 738         else
 739                 window->success_ratio = IWL_INVALID_VALUE;
 740
 741         fail_count = window->counter - window->success_counter;
 742
 743         /* Calculate average throughput, if we have enough history. */
 744         if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
 745             (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
 746                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 747         else
 748                 window->average_tpt = IWL_INVALID_VALUE;
 749
 750         return 0;
 751 }
 752
 753 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
 754                                struct iwl_lq_sta *lq_sta,
 755                                struct iwl_scale_tbl_info *tbl,
 756                                int scale_index, int attempts, int successes,
 757                                u8 reduced_txp)
 758 {
 759         struct iwl_rate_scale_data *window = NULL;
 760
 761         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 762                 return -EINVAL;
 763
 764         window = &tbl->tpc_win[reduced_txp];
 765         return  _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 766                                     window);
 767 }
 768
 769 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm,
 770                                     struct iwl_mvm_sta *mvmsta,
 771                                     u8 tid, int successes)
 772 {
 773         struct iwl_mvm_tid_data *tid_data;
 774
 775         if (tid >= IWL_MAX_TID_COUNT)
 776                 return;
 777
 778         tid_data = &mvmsta->tid_data[tid];
 779
 780         /*
 781          * Measure if there're enough successful transmits per second.
 782          * These statistics are used only to decide if we can start a
 783          * BA session, so it should be updated only when A-MPDU is
 784          * off.
 785          */
 786         if (tid_data->state != IWL_AGG_OFF)
 787                 return;
 788
 789         if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) ||
 790             (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) {
 791                 tid_data->tx_count_last = tid_data->tx_count;
 792                 tid_data->tx_count = 0;
 793                 tid_data->tpt_meas_start = jiffies;
 794         } else {
 795                 tid_data->tx_count += successes;
 796         }
 797 }
 798
 799 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
 800                                struct iwl_mvm_sta *mvmsta, u8 tid,
 801                                struct iwl_scale_tbl_info *tbl,
 802                                int scale_index, int attempts, int successes)
 803 {
 804         struct iwl_rate_scale_data *window = NULL;
 805
 806         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 807                 return -EINVAL;
 808
 809         if (tbl->column != RS_COLUMN_INVALID) {
 810                 struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers;
 811
 812                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 813                 pers->tx_stats[tbl->column][scale_index].success += successes;
 814         }
 815
 816         rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes);
 817
 818         /* Select window for current tx bit rate */
 819         window = &(tbl->win[scale_index]);
 820         return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 821                                    window);
 822 }
 823
 824 /* Convert rs_rate object into ucode rate bitmask */
 825 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 826                                   struct rs_rate *rate)
 827 {
 828         u32 ucode_rate = 0;
 829         int index = rate->index;
 830
 831         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 832                          RATE_MCS_ANT_ABC_MSK);
 833
 834         if (is_legacy(rate)) {
 835                 ucode_rate |= iwl_rates[index].plcp;
 836                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 837                         ucode_rate |= RATE_MCS_CCK_MSK;
 838                 return ucode_rate;
 839         }
 840
 841         if (is_ht(rate)) {
 842                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 843                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 844                         index = IWL_LAST_HT_RATE;
 845                 }
 846                 ucode_rate |= RATE_MCS_HT_MSK;
 847
 848                 if (is_ht_siso(rate))
 849                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 850                 else if (is_ht_mimo2(rate))
 851                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 852                 else
 853                         WARN_ON_ONCE(1);
 854         } else if (is_vht(rate)) {
 855                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 856                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 857                         index = IWL_LAST_VHT_RATE;
 858                 }
 859                 ucode_rate |= RATE_MCS_VHT_MSK;
 860                 if (is_vht_siso(rate))
 861                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 862                 else if (is_vht_mimo2(rate))
 863                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 864                 else
 865                         WARN_ON_ONCE(1);
 866
 867         } else {
 868                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 869         }
 870
 871         if (is_siso(rate) && rate->stbc) {
 872                 /* To enable STBC we need to set both a flag and ANT_AB */
 873                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 874                 ucode_rate |= RATE_MCS_STBC_MSK;
 875         }
 876
 877         ucode_rate |= rate->bw;
 878         if (rate->sgi)
 879                 ucode_rate |= RATE_MCS_SGI_MSK;
 880         if (rate->ldpc)
 881                 ucode_rate |= RATE_MCS_LDPC_MSK;
 882
 883         return ucode_rate;
 884 }
 885
 886 /* Convert a ucode rate into an rs_rate object */
 887 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 888                                    enum nl80211_band band,
 889                                    struct rs_rate *rate)
 890 {
 891         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 892         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 893         u8 nss;
 894
 895         memset(rate, 0, sizeof(*rate));
 896         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 897
 898         if (rate->index == IWL_RATE_INVALID)
 899                 return -EINVAL;
 900
 901         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 902
 903         /* Legacy */
 904         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 905             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 906                 if (num_of_ant == 1) {
 907                         if (band == NL80211_BAND_5GHZ)
 908                                 rate->type = LQ_LEGACY_A;
 909                         else
 910                                 rate->type = LQ_LEGACY_G;
 911                 }
 912
 913                 return 0;
 914         }
 915
 916         /* HT or VHT */
 917         if (ucode_rate & RATE_MCS_SGI_MSK)
 918                 rate->sgi = true;
 919         if (ucode_rate & RATE_MCS_LDPC_MSK)
 920                 rate->ldpc = true;
 921         if (ucode_rate & RATE_MCS_STBC_MSK)
 922                 rate->stbc = true;
 923         if (ucode_rate & RATE_MCS_BF_MSK)
 924                 rate->bfer = true;
 925
 926         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 927
 928         if (ucode_rate & RATE_MCS_HT_MSK) {
 929                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 930                        RATE_HT_MCS_NSS_POS) + 1;
 931
 932                 if (nss == 1) {
 933                         rate->type = LQ_HT_SISO;
 934                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 935                                   "stbc %d bfer %d",
 936                                   rate->stbc, rate->bfer);
 937                 } else if (nss == 2) {
 938                         rate->type = LQ_HT_MIMO2;
 939                         WARN_ON_ONCE(num_of_ant != 2);
 940                 } else {
 941                         WARN_ON_ONCE(1);
 942                 }
 943         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 944                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 945                        RATE_VHT_MCS_NSS_POS) + 1;
 946
 947                 if (nss == 1) {
 948                         rate->type = LQ_VHT_SISO;
 949                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 950                                   "stbc %d bfer %d",
 951                                   rate->stbc, rate->bfer);
 952                 } else if (nss == 2) {
 953                         rate->type = LQ_VHT_MIMO2;
 954                         WARN_ON_ONCE(num_of_ant != 2);
 955                 } else {
 956                         WARN_ON_ONCE(1);
 957                 }
 958         }
 959
 960         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 961                      !is_vht(rate));
 962
 963         return 0;
 964 }
 965
 966 /* switch to another antenna/antennas and return 1 */
 967 /* if no other valid antenna found, return 0 */
 968 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 969 {
 970         u8 new_ant_type;
 971
 972         if (!rate->ant || WARN_ON_ONCE(rate->ant & ANT_C))
 973                 return 0;
 974
 975         if (!rs_is_valid_ant(valid_ant, rate->ant))
 976                 return 0;
 977
 978         new_ant_type = ant_toggle_lookup[rate->ant];
 979
 980         while ((new_ant_type != rate->ant) &&
 981                !rs_is_valid_ant(valid_ant, new_ant_type))
 982                 new_ant_type = ant_toggle_lookup[new_ant_type];
 983
 984         if (new_ant_type == rate->ant)
 985                 return 0;
 986
 987         rate->ant = new_ant_type;
 988
 989         return 1;
 990 }
 991
 992 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 993                                   struct rs_rate *rate)
 994 {
 995         if (is_legacy(rate))
 996                 return lq_sta->active_legacy_rate;
 997         else if (is_siso(rate))
 998                 return lq_sta->active_siso_rate;
 999         else if (is_mimo2(rate))
1000                 return lq_sta->active_mimo2_rate;
1001
1002         WARN_ON_ONCE(1);
1003         return 0;
1004 }
1005
1006 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
1007                                 int rate_type)
1008 {
1009         u8 high = IWL_RATE_INVALID;
1010         u8 low = IWL_RATE_INVALID;
1011
1012         /* 802.11A or ht walks to the next literal adjacent rate in
1013          * the rate table */
1014         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
1015                 int i;
1016                 u32 mask;
1017
1018                 /* Find the previous rate that is in the rate mask */
1019                 i = index - 1;
1020                 if (i >= 0)
1021                         mask = BIT(i);
1022                 for (; i >= 0; i--, mask >>= 1) {
1023                         if (rate_mask & mask) {
1024                                 low = i;
1025                                 break;
1026                         }
1027                 }
1028
1029                 /* Find the next rate that is in the rate mask */
1030                 i = index + 1;
1031                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
1032                         if (rate_mask & mask) {
1033                                 high = i;
1034                                 break;
1035                         }
1036                 }
1037
1038                 return (high << 8) | low;
1039         }
1040
1041         low = index;
1042         while (low != IWL_RATE_INVALID) {
1043                 low = iwl_rates[low].prev_rs;
1044                 if (low == IWL_RATE_INVALID)
1045                         break;
1046                 if (rate_mask & (1 << low))
1047                         break;
1048         }
1049
1050         high = index;
1051         while (high != IWL_RATE_INVALID) {
1052                 high = iwl_rates[high].next_rs;
1053                 if (high == IWL_RATE_INVALID)
1054                         break;
1055                 if (rate_mask & (1 << high))
1056                         break;
1057         }
1058
1059         return (high << 8) | low;
1060 }
1061
1062 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1063                                      struct rs_rate *rate)
1064 {
1065         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1066 }
1067
1068 /* Get the next supported lower rate in the current column.
1069  * Return true if bottom rate in the current column was reached
1070  */
1071 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1072                                         struct rs_rate *rate)
1073 {
1074         u8 low;
1075         u16 high_low;
1076         u16 rate_mask;
1077         struct iwl_mvm *mvm = lq_sta->pers.drv;
1078
1079         rate_mask = rs_get_supported_rates(lq_sta, rate);
1080         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1081                                         rate->type);
1082         low = high_low & 0xff;
1083
1084         /* Bottom rate of column reached */
1085         if (low == IWL_RATE_INVALID)
1086                 return true;
1087
1088         rate->index = low;
1089         return false;
1090 }
1091
1092 /* Get the next rate to use following a column downgrade */
1093 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1094                                           struct rs_rate *rate)
1095 {
1096         struct iwl_mvm *mvm = lq_sta->pers.drv;
1097
1098         if (is_legacy(rate)) {
1099                 /* No column to downgrade from Legacy */
1100                 return;
1101         } else if (is_siso(rate)) {
1102                 /* Downgrade to Legacy if we were in SISO */
1103                 if (lq_sta->band == NL80211_BAND_5GHZ)
1104                         rate->type = LQ_LEGACY_A;
1105                 else
1106                         rate->type = LQ_LEGACY_G;
1107
1108                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1109
1110                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1111                              rate->index > IWL_RATE_MCS_9_INDEX);
1112
1113                 rate->index = rs_ht_to_legacy[rate->index];
1114                 rate->ldpc = false;
1115         } else {
1116                 /* Downgrade to SISO with same MCS if in MIMO  */
1117                 rate->type = is_vht_mimo2(rate) ?
1118                         LQ_VHT_SISO : LQ_HT_SISO;
1119         }
1120
1121         if (num_of_ant(rate->ant) > 1)
1122                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1123
1124         /* Relevant in both switching to SISO or Legacy */
1125         rate->sgi = false;
1126
1127         if (!rs_rate_supported(lq_sta, rate))
1128                 rs_get_lower_rate_in_column(lq_sta, rate);
1129 }
1130
1131 /* Check if both rates share the same column */
1132 static inline bool rs_rate_column_match(struct rs_rate *a,
1133                                         struct rs_rate *b)
1134 {
1135         bool ant_match;
1136
1137         if (a->stbc || a->bfer)
1138                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1139         else
1140                 ant_match = (a->ant == b->ant);
1141
1142         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1143                 && ant_match;
1144 }
1145
1146 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1147 {
1148         if (is_legacy(rate)) {
1149                 if (rate->ant == ANT_A)
1150                         return RS_COLUMN_LEGACY_ANT_A;
1151
1152                 if (rate->ant == ANT_B)
1153                         return RS_COLUMN_LEGACY_ANT_B;
1154
1155                 goto err;
1156         }
1157
1158         if (is_siso(rate)) {
1159                 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1160                         return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1161                                 RS_COLUMN_SISO_ANT_A;
1162
1163                 if (rate->ant == ANT_B)
1164                         return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1165                                 RS_COLUMN_SISO_ANT_B;
1166
1167                 goto err;
1168         }
1169
1170         if (is_mimo(rate))
1171                 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1172
1173 err:
1174         return RS_COLUMN_INVALID;
1175 }
1176
1177 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1178 {
1179         u8 tid = IWL_MAX_TID_COUNT;
1180
1181         if (ieee80211_is_data_qos(hdr->frame_control)) {
1182                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1183                 tid = qc[0] & 0xf;
1184         }
1185
1186         if (unlikely(tid > IWL_MAX_TID_COUNT))
1187                 tid = IWL_MAX_TID_COUNT;
1188
1189         return tid;
1190 }
1191
1192 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1193                           int tid, struct ieee80211_tx_info *info, bool ndp)
1194 {
1195         int legacy_success;
1196         int retries;
1197         int i;
1198         struct iwl_lq_cmd *table;
1199         u32 lq_hwrate;
1200         struct rs_rate lq_rate, tx_resp_rate;
1201         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1202         u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
1203         u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
1204         u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
1205         u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1206         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1207         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
1208
1209         /* Treat uninitialized rate scaling data same as non-existing. */
1210         if (!lq_sta) {
1211                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1212                 return;
1213         } else if (!lq_sta->pers.drv) {
1214                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1215                 return;
1216         }
1217
1218         /* This packet was aggregated but doesn't carry status info */
1219         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1220             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1221                 return;
1222
1223         rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1224
1225 #ifdef CONFIG_MAC80211_DEBUGFS
1226         /* Disable last tx check if we are debugging with fixed rate but
1227          * update tx stats */
1228         if (lq_sta->pers.dbg_fixed_rate) {
1229                 int index = tx_resp_rate.index;
1230                 enum rs_column column;
1231                 int attempts, success;
1232
1233                 column = rs_get_column_from_rate(&tx_resp_rate);
1234                 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1235                               "Can't map rate 0x%x to column",
1236                               tx_resp_hwrate))
1237                         return;
1238
1239                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1240                         attempts = info->status.ampdu_len;
1241                         success = info->status.ampdu_ack_len;
1242                 } else {
1243                         attempts = info->status.rates[0].count;
1244                         success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1245                 }
1246
1247                 lq_sta->pers.tx_stats[column][index].total += attempts;
1248                 lq_sta->pers.tx_stats[column][index].success += success;
1249
1250                 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1251                                tx_resp_hwrate, success, attempts);
1252                 return;
1253         }
1254 #endif
1255
1256         if (time_after(jiffies,
1257                        (unsigned long)(lq_sta->last_tx +
1258                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1259                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1260                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1261                 return;
1262         }
1263         lq_sta->last_tx = jiffies;
1264
1265         /* Ignore this Tx frame response if its initial rate doesn't match
1266          * that of latest Link Quality command.  There may be stragglers
1267          * from a previous Link Quality command, but we're no longer interested
1268          * in those; they're either from the "active" mode while we're trying
1269          * to check "search" mode, or a prior "search" mode after we've moved
1270          * to a new "search" mode (which might become the new "active" mode).
1271          */
1272         table = &lq_sta->lq;
1273         lq_hwrate = le32_to_cpu(table->rs_table[0]);
1274         rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1275
1276         /* Here we actually compare this rate to the latest LQ command */
1277         if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
1278                 IWL_DEBUG_RATE(mvm,
1279                                "tx resp color 0x%x does not match 0x%x\n",
1280                                lq_color, LQ_FLAG_COLOR_GET(table->flags));
1281
1282                 /*
1283                  * Since rates mis-match, the last LQ command may have failed.
1284                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1285                  * ... driver.
1286                  */
1287                 lq_sta->missed_rate_counter++;
1288                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1289                         lq_sta->missed_rate_counter = 0;
1290                         IWL_DEBUG_RATE(mvm,
1291                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1292                                        lq_sta->rs_state);
1293                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1294                 }
1295                 /* Regardless, ignore this status info for outdated rate */
1296                 return;
1297         } else
1298                 /* Rate did match, so reset the missed_rate_counter */
1299                 lq_sta->missed_rate_counter = 0;
1300
1301         if (!lq_sta->search_better_tbl) {
1302                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1303                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1304         } else {
1305                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1306                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1307         }
1308
1309         if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1310                 IWL_DEBUG_RATE(mvm,
1311                                "Neither active nor search matches tx rate\n");
1312                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1313                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1314                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1315                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1316                 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1317
1318                 /*
1319                  * no matching table found, let's by-pass the data collection
1320                  * and continue to perform rate scale to find the rate table
1321                  */
1322                 rs_stay_in_table(lq_sta, true);
1323                 goto done;
1324         }
1325
1326         /*
1327          * Updating the frame history depends on whether packets were
1328          * aggregated.
1329          *
1330          * For aggregation, all packets were transmitted at the same rate, the
1331          * first index into rate scale table.
1332          */
1333         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1334                 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
1335                                     info->status.ampdu_len,
1336                                     info->status.ampdu_ack_len,
1337                                     reduced_txp);
1338
1339                 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1340                  * it as a single frame loss as we don't want the success ratio
1341                  * to dip too quickly because a BA wasn't received.
1342                  * For TPC, there's no need for this optimisation since we want
1343                  * to recover very quickly from a bad power reduction and,
1344                  * therefore we'd like the success ratio to get an immediate hit
1345                  * when failing to get a BA, so we'd switch back to a lower or
1346                  * zero power reduction. When FW transmits agg with a rate
1347                  * different from the initial rate, it will not use reduced txp
1348                  * and will send BA notification twice (one empty with reduced
1349                  * txp equal to the value from LQ and one with reduced txp 0).
1350                  * We need to update counters for each txp level accordingly.
1351                  */
1352                 if (info->status.ampdu_ack_len == 0)
1353                         info->status.ampdu_len = 1;
1354
1355                 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, tx_resp_rate.index,
1356                                     info->status.ampdu_len,
1357                                     info->status.ampdu_ack_len);
1358
1359                 /* Update success/fail counts if not searching for new mode */
1360                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1361                         lq_sta->total_success += info->status.ampdu_ack_len;
1362                         lq_sta->total_failed += (info->status.ampdu_len -
1363                                         info->status.ampdu_ack_len);
1364                 }
1365         } else {
1366                 /* For legacy, update frame history with for each Tx retry. */
1367                 retries = info->status.rates[0].count - 1;
1368                 /* HW doesn't send more than 15 retries */
1369                 retries = min(retries, 15);
1370
1371                 /* The last transmission may have been successful */
1372                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1373                 /* Collect data for each rate used during failed TX attempts */
1374                 for (i = 0; i <= retries; ++i) {
1375                         lq_hwrate = le32_to_cpu(table->rs_table[i]);
1376                         rs_rate_from_ucode_rate(lq_hwrate, info->band,
1377                                                 &lq_rate);
1378                         /*
1379                          * Only collect stats if retried rate is in the same RS
1380                          * table as active/search.
1381                          */
1382                         if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1383                                 tmp_tbl = curr_tbl;
1384                         else if (rs_rate_column_match(&lq_rate,
1385                                                       &other_tbl->rate))
1386                                 tmp_tbl = other_tbl;
1387                         else
1388                                 continue;
1389
1390                         rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1391                                             tx_resp_rate.index, 1,
1392                                             i < retries ? 0 : legacy_success,
1393                                             reduced_txp);
1394                         rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
1395                                             tx_resp_rate.index, 1,
1396                                             i < retries ? 0 : legacy_success);
1397                 }
1398
1399                 /* Update success/fail counts if not searching for new mode */
1400                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1401                         lq_sta->total_success += legacy_success;
1402                         lq_sta->total_failed += retries + (1 - legacy_success);
1403                 }
1404         }
1405         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1406         lq_sta->last_rate_n_flags = lq_hwrate;
1407         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1408 done:
1409         /* See if there's a better rate or modulation mode to try. */
1410         if (sta->supp_rates[info->band])
1411                 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
1412 }
1413
1414 /*
1415  * mac80211 sends us Tx status
1416  */
1417 static void rs_drv_mac80211_tx_status(void *mvm_r,
1418                                       struct ieee80211_supported_band *sband,
1419                                       struct ieee80211_sta *sta, void *priv_sta,
1420                                       struct sk_buff *skb)
1421 {
1422         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1423         struct iwl_op_mode *op_mode = mvm_r;
1424         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1425         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1426
1427         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1428                 return;
1429
1430         if (!ieee80211_is_data(hdr->frame_control) ||
1431             info->flags & IEEE80211_TX_CTL_NO_ACK)
1432                 return;
1433
1434         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1435                              ieee80211_is_qos_nullfunc(hdr->frame_control));
1436 }
1437
1438 /*
1439  * Begin a period of staying with a selected modulation mode.
1440  * Set "stay_in_tbl" flag to prevent any mode switches.
1441  * Set frame tx success limits according to legacy vs. high-throughput,
1442  * and reset overall (spanning all rates) tx success history statistics.
1443  * These control how long we stay using same modulation mode before
1444  * searching for a new mode.
1445  */
1446 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1447                                  struct iwl_lq_sta *lq_sta)
1448 {
1449         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1450         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1451         if (is_legacy) {
1452                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1453                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1454                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1455         } else {
1456                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1457                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1458                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1459         }
1460         lq_sta->table_count = 0;
1461         lq_sta->total_failed = 0;
1462         lq_sta->total_success = 0;
1463         lq_sta->flush_timer = jiffies;
1464         lq_sta->visited_columns = 0;
1465 }
1466
1467 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1468 {
1469         if (rate_mask)
1470                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1471         return IWL_RATE_INVALID;
1472 }
1473
1474 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1475                                    const struct rs_tx_column *column)
1476 {
1477         switch (column->mode) {
1478         case RS_LEGACY:
1479                 return lq_sta->max_legacy_rate_idx;
1480         case RS_SISO:
1481                 return lq_sta->max_siso_rate_idx;
1482         case RS_MIMO2:
1483                 return lq_sta->max_mimo2_rate_idx;
1484         default:
1485                 WARN_ON_ONCE(1);
1486         }
1487
1488         return lq_sta->max_legacy_rate_idx;
1489 }
1490
1491 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1492                                             const struct rs_tx_column *column,
1493                                             u32 bw)
1494 {
1495         /* Used to choose among HT tables */
1496         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1497
1498         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1499                          column->mode != RS_SISO &&
1500                          column->mode != RS_MIMO2))
1501                 return expected_tpt_legacy;
1502
1503         /* Legacy rates have only one table */
1504         if (column->mode == RS_LEGACY)
1505                 return expected_tpt_legacy;
1506
1507         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1508         /* Choose among many HT tables depending on number of streams
1509          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1510          * status */
1511         if (column->mode == RS_SISO) {
1512                 switch (bw) {
1513                 case RATE_MCS_CHAN_WIDTH_20:
1514                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1515                         break;
1516                 case RATE_MCS_CHAN_WIDTH_40:
1517                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1518                         break;
1519                 case RATE_MCS_CHAN_WIDTH_80:
1520                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1521                         break;
1522                 case RATE_MCS_CHAN_WIDTH_160:
1523                         ht_tbl_pointer = expected_tpt_siso_160MHz;
1524                         break;
1525                 default:
1526                         WARN_ON_ONCE(1);
1527                 }
1528         } else if (column->mode == RS_MIMO2) {
1529                 switch (bw) {
1530                 case RATE_MCS_CHAN_WIDTH_20:
1531                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1532                         break;
1533                 case RATE_MCS_CHAN_WIDTH_40:
1534                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1535                         break;
1536                 case RATE_MCS_CHAN_WIDTH_80:
1537                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1538                         break;
1539                 case RATE_MCS_CHAN_WIDTH_160:
1540                         ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1541                         break;
1542                 default:
1543                         WARN_ON_ONCE(1);
1544                 }
1545         } else {
1546                 WARN_ON_ONCE(1);
1547         }
1548
1549         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1550                 return ht_tbl_pointer[0];
1551         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1552                 return ht_tbl_pointer[1];
1553         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1554                 return ht_tbl_pointer[2];
1555         else                                            /* AGG+SGI */
1556                 return ht_tbl_pointer[3];
1557 }
1558
1559 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1560                                       struct iwl_scale_tbl_info *tbl)
1561 {
1562         struct rs_rate *rate = &tbl->rate;
1563         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1564
1565         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1566 }
1567
1568 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1569                             struct iwl_lq_sta *lq_sta,
1570                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1571                             unsigned long rate_mask, s8 index)
1572 {
1573         struct iwl_scale_tbl_info *active_tbl =
1574             &(lq_sta->lq_info[lq_sta->active_tbl]);
1575         s32 success_ratio = active_tbl->win[index].success_ratio;
1576         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1577         const u16 *tpt_tbl = tbl->expected_tpt;
1578         u16 high_low;
1579         u32 target_tpt;
1580         int rate_idx;
1581
1582         if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1583                 target_tpt = 100 * expected_current_tpt;
1584                 IWL_DEBUG_RATE(mvm,
1585                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1586                                success_ratio, target_tpt);
1587         } else {
1588                 target_tpt = lq_sta->last_tpt;
1589                 IWL_DEBUG_RATE(mvm,
1590                                "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1591                                success_ratio, target_tpt);
1592         }
1593
1594         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1595
1596         while (rate_idx != IWL_RATE_INVALID) {
1597                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1598                         break;
1599
1600                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1601                                                 tbl->rate.type);
1602
1603                 rate_idx = (high_low >> 8) & 0xff;
1604         }
1605
1606         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1607                        rate_idx, target_tpt,
1608                        rate_idx != IWL_RATE_INVALID ?
1609                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1610
1611         return rate_idx;
1612 }
1613
1614 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1615 {
1616         switch (sta->bandwidth) {
1617         case IEEE80211_STA_RX_BW_160:
1618                 return RATE_MCS_CHAN_WIDTH_160;
1619         case IEEE80211_STA_RX_BW_80:
1620                 return RATE_MCS_CHAN_WIDTH_80;
1621         case IEEE80211_STA_RX_BW_40:
1622                 return RATE_MCS_CHAN_WIDTH_40;
1623         case IEEE80211_STA_RX_BW_20:
1624         default:
1625                 return RATE_MCS_CHAN_WIDTH_20;
1626         }
1627 }
1628
1629 /*
1630  * Check whether we should continue using same modulation mode, or
1631  * begin search for a new mode, based on:
1632  * 1) # tx successes or failures while using this mode
1633  * 2) # times calling this function
1634  * 3) elapsed time in this mode (not used, for now)
1635  */
1636 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1637 {
1638         struct iwl_scale_tbl_info *tbl;
1639         int active_tbl;
1640         int flush_interval_passed = 0;
1641         struct iwl_mvm *mvm;
1642
1643         mvm = lq_sta->pers.drv;
1644         active_tbl = lq_sta->active_tbl;
1645
1646         tbl = &(lq_sta->lq_info[active_tbl]);
1647
1648         /* If we've been disallowing search, see if we should now allow it */
1649         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1650                 /* Elapsed time using current modulation mode */
1651                 if (lq_sta->flush_timer)
1652                         flush_interval_passed =
1653                                 time_after(jiffies,
1654                                            (unsigned long)(lq_sta->flush_timer +
1655                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1656
1657                 /*
1658                  * Check if we should allow search for new modulation mode.
1659                  * If many frames have failed or succeeded, or we've used
1660                  * this same modulation for a long time, allow search, and
1661                  * reset history stats that keep track of whether we should
1662                  * allow a new search.  Also (below) reset all bitmaps and
1663                  * stats in active history.
1664                  */
1665                 if (force_search ||
1666                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1667                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1668                     ((!lq_sta->search_better_tbl) &&
1669                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1670                         IWL_DEBUG_RATE(mvm,
1671                                        "LQ: stay is expired %d %d %d\n",
1672                                      lq_sta->total_failed,
1673                                      lq_sta->total_success,
1674                                      flush_interval_passed);
1675
1676                         /* Allow search for new mode */
1677                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1678                         IWL_DEBUG_RATE(mvm,
1679                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1680                         lq_sta->total_failed = 0;
1681                         lq_sta->total_success = 0;
1682                         lq_sta->flush_timer = 0;
1683                         /* mark the current column as visited */
1684                         lq_sta->visited_columns = BIT(tbl->column);
1685                 /*
1686                  * Else if we've used this modulation mode enough repetitions
1687                  * (regardless of elapsed time or success/failure), reset
1688                  * history bitmaps and rate-specific stats for all rates in
1689                  * active table.
1690                  */
1691                 } else {
1692                         lq_sta->table_count++;
1693                         if (lq_sta->table_count >=
1694                             lq_sta->table_count_limit) {
1695                                 lq_sta->table_count = 0;
1696
1697                                 IWL_DEBUG_RATE(mvm,
1698                                                "LQ: stay in table clear win\n");
1699                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1700                         }
1701                 }
1702
1703                 /* If transitioning to allow "search", reset all history
1704                  * bitmaps and stats in active table (this will become the new
1705                  * "search" table). */
1706                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1707                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1708                 }
1709         }
1710 }
1711
1712 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1713                              struct iwl_scale_tbl_info *tbl,
1714                              enum rs_action scale_action)
1715 {
1716         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1717
1718         if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1719             tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1720             scale_action == RS_ACTION_DOWNSCALE)
1721                 mvmsta->tlc_amsdu = false;
1722         else
1723                 mvmsta->tlc_amsdu = true;
1724 }
1725
1726 /*
1727  * setup rate table in uCode
1728  */
1729 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1730                                struct ieee80211_sta *sta,
1731                                struct iwl_lq_sta *lq_sta,
1732                                struct iwl_scale_tbl_info *tbl)
1733 {
1734         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1735         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1736 }
1737
1738 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1739                               struct ieee80211_sta *sta,
1740                               struct iwl_lq_sta *lq_sta,
1741                               struct iwl_scale_tbl_info *tbl,
1742                               enum rs_action scale_action)
1743 {
1744         if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1745                 return false;
1746
1747         if (!is_vht_siso(&tbl->rate))
1748                 return false;
1749
1750         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1751             (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1752             (scale_action == RS_ACTION_DOWNSCALE)) {
1753                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1754                 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1755                 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1756                 goto tweaked;
1757         }
1758
1759         /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1760          * sustainable, i.e. we're past the test window. We can't go back
1761          * if MCS5 is just tested as this will happen always after switching
1762          * to 20Mhz MCS4 because the rate stats are cleared.
1763          */
1764         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1765             (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1766              (scale_action == RS_ACTION_STAY)) ||
1767              ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1768               (scale_action == RS_ACTION_UPSCALE)))) {
1769                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1770                 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1771                 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1772                 goto tweaked;
1773         }
1774
1775         return false;
1776
1777 tweaked:
1778         rs_set_expected_tpt_table(lq_sta, tbl);
1779         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1780         return true;
1781 }
1782
1783 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1784                                          struct iwl_lq_sta *lq_sta,
1785                                          struct ieee80211_sta *sta,
1786                                          struct iwl_scale_tbl_info *tbl)
1787 {
1788         int i, j, max_rate;
1789         enum rs_column next_col_id;
1790         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1791         const struct rs_tx_column *next_col;
1792         allow_column_func_t allow_func;
1793         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1794         const u16 *expected_tpt_tbl;
1795         u16 tpt, max_expected_tpt;
1796
1797         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1798                 next_col_id = curr_col->next_columns[i];
1799
1800                 if (next_col_id == RS_COLUMN_INVALID)
1801                         continue;
1802
1803                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1804                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1805                                        next_col_id);
1806                         continue;
1807                 }
1808
1809                 next_col = &rs_tx_columns[next_col_id];
1810
1811                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1812                         IWL_DEBUG_RATE(mvm,
1813                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1814                                        next_col_id, valid_ants, next_col->ant);
1815                         continue;
1816                 }
1817
1818                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1819                         allow_func = next_col->checks[j];
1820                         if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1821                                                       next_col))
1822                                 break;
1823                 }
1824
1825                 if (j != MAX_COLUMN_CHECKS) {
1826                         IWL_DEBUG_RATE(mvm,
1827                                        "Skip column %d: not allowed (check %d failed)\n",
1828                                        next_col_id, j);
1829
1830                         continue;
1831                 }
1832
1833                 tpt = lq_sta->last_tpt / 100;
1834                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1835                                                      rs_bw_from_sta_bw(sta));
1836                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1837                         continue;
1838
1839                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1840                 if (max_rate == IWL_RATE_INVALID) {
1841                         IWL_DEBUG_RATE(mvm,
1842                                        "Skip column %d: no rate is allowed in this column\n",
1843                                        next_col_id);
1844                         continue;
1845                 }
1846
1847                 max_expected_tpt = expected_tpt_tbl[max_rate];
1848                 if (tpt >= max_expected_tpt) {
1849                         IWL_DEBUG_RATE(mvm,
1850                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1851                                        next_col_id, max_expected_tpt, tpt);
1852                         continue;
1853                 }
1854
1855                 IWL_DEBUG_RATE(mvm,
1856                                "Found potential column %d. Max expected %d current %d\n",
1857                                next_col_id, max_expected_tpt, tpt);
1858                 break;
1859         }
1860
1861         if (i == MAX_NEXT_COLUMNS)
1862                 return RS_COLUMN_INVALID;
1863
1864         return next_col_id;
1865 }
1866
1867 static int rs_switch_to_column(struct iwl_mvm *mvm,
1868                                struct iwl_lq_sta *lq_sta,
1869                                struct ieee80211_sta *sta,
1870                                enum rs_column col_id)
1871 {
1872         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1873         struct iwl_scale_tbl_info *search_tbl =
1874                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1875         struct rs_rate *rate = &search_tbl->rate;
1876         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1877         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1878         unsigned long rate_mask = 0;
1879         u32 rate_idx = 0;
1880
1881         memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1882
1883         rate->sgi = column->sgi;
1884         rate->ant = column->ant;
1885
1886         if (column->mode == RS_LEGACY) {
1887                 if (lq_sta->band == NL80211_BAND_5GHZ)
1888                         rate->type = LQ_LEGACY_A;
1889                 else
1890                         rate->type = LQ_LEGACY_G;
1891
1892                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1893                 rate->ldpc = false;
1894                 rate_mask = lq_sta->active_legacy_rate;
1895         } else if (column->mode == RS_SISO) {
1896                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1897                 rate_mask = lq_sta->active_siso_rate;
1898         } else if (column->mode == RS_MIMO2) {
1899                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1900                 rate_mask = lq_sta->active_mimo2_rate;
1901         } else {
1902                 WARN_ONCE(1, "Bad column mode");
1903         }
1904
1905         if (column->mode != RS_LEGACY) {
1906                 rate->bw = rs_bw_from_sta_bw(sta);
1907                 rate->ldpc = lq_sta->ldpc;
1908         }
1909
1910         search_tbl->column = col_id;
1911         rs_set_expected_tpt_table(lq_sta, search_tbl);
1912
1913         lq_sta->visited_columns |= BIT(col_id);
1914
1915         /* Get the best matching rate if we're changing modes. e.g.
1916          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1917          */
1918         if (curr_column->mode != column->mode) {
1919                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1920                                             rate_mask, rate->index);
1921
1922                 if ((rate_idx == IWL_RATE_INVALID) ||
1923                     !(BIT(rate_idx) & rate_mask)) {
1924                         IWL_DEBUG_RATE(mvm,
1925                                        "can not switch with index %d"
1926                                        " rate mask %lx\n",
1927                                        rate_idx, rate_mask);
1928
1929                         goto err;
1930                 }
1931
1932                 rate->index = rate_idx;
1933         }
1934
1935         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1936                        col_id, rate->index);
1937
1938         return 0;
1939
1940 err:
1941         rate->type = LQ_NONE;
1942         return -1;
1943 }
1944
1945 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1946                                          struct iwl_scale_tbl_info *tbl,
1947                                          s32 sr, int low, int high,
1948                                          int current_tpt,
1949                                          int low_tpt, int high_tpt)
1950 {
1951         enum rs_action action = RS_ACTION_STAY;
1952
1953         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1954             (current_tpt == 0)) {
1955                 IWL_DEBUG_RATE(mvm,
1956                                "Decrease rate because of low SR\n");
1957                 return RS_ACTION_DOWNSCALE;
1958         }
1959
1960         if ((low_tpt == IWL_INVALID_VALUE) &&
1961             (high_tpt == IWL_INVALID_VALUE) &&
1962             (high != IWL_RATE_INVALID)) {
1963                 IWL_DEBUG_RATE(mvm,
1964                                "No data about high/low rates. Increase rate\n");
1965                 return RS_ACTION_UPSCALE;
1966         }
1967
1968         if ((high_tpt == IWL_INVALID_VALUE) &&
1969             (high != IWL_RATE_INVALID) &&
1970             (low_tpt != IWL_INVALID_VALUE) &&
1971             (low_tpt < current_tpt)) {
1972                 IWL_DEBUG_RATE(mvm,
1973                                "No data about high rate and low rate is worse. Increase rate\n");
1974                 return RS_ACTION_UPSCALE;
1975         }
1976
1977         if ((high_tpt != IWL_INVALID_VALUE) &&
1978             (high_tpt > current_tpt)) {
1979                 IWL_DEBUG_RATE(mvm,
1980                                "Higher rate is better. Increate rate\n");
1981                 return RS_ACTION_UPSCALE;
1982         }
1983
1984         if ((low_tpt != IWL_INVALID_VALUE) &&
1985             (high_tpt != IWL_INVALID_VALUE) &&
1986             (low_tpt < current_tpt) &&
1987             (high_tpt < current_tpt)) {
1988                 IWL_DEBUG_RATE(mvm,
1989                                "Both high and low are worse. Maintain rate\n");
1990                 return RS_ACTION_STAY;
1991         }
1992
1993         if ((low_tpt != IWL_INVALID_VALUE) &&
1994             (low_tpt > current_tpt)) {
1995                 IWL_DEBUG_RATE(mvm,
1996                                "Lower rate is better\n");
1997                 action = RS_ACTION_DOWNSCALE;
1998                 goto out;
1999         }
2000
2001         if ((low_tpt == IWL_INVALID_VALUE) &&
2002             (low != IWL_RATE_INVALID)) {
2003                 IWL_DEBUG_RATE(mvm,
2004                                "No data about lower rate\n");
2005                 action = RS_ACTION_DOWNSCALE;
2006                 goto out;
2007         }
2008
2009         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
2010
2011 out:
2012         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
2013                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
2014                         IWL_DEBUG_RATE(mvm,
2015                                        "SR is above NO DECREASE. Avoid downscale\n");
2016                         action = RS_ACTION_STAY;
2017                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
2018                         IWL_DEBUG_RATE(mvm,
2019                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
2020                         action = RS_ACTION_STAY;
2021                 } else {
2022                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
2023                 }
2024         }
2025
2026         return action;
2027 }
2028
2029 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2030                           struct iwl_lq_sta *lq_sta)
2031 {
2032         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
2033          * supports STBC of at least 1*SS
2034          */
2035         if (!lq_sta->stbc_capable)
2036                 return false;
2037
2038         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2039                 return false;
2040
2041         return true;
2042 }
2043
2044 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2045                                 int *weaker, int *stronger)
2046 {
2047         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2048         if (*weaker > TPC_MAX_REDUCTION)
2049                 *weaker = TPC_INVALID;
2050
2051         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2052         if (*stronger < 0)
2053                 *stronger = TPC_INVALID;
2054 }
2055
2056 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2057                            struct rs_rate *rate, enum nl80211_band band)
2058 {
2059         int index = rate->index;
2060         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2061         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2062                                 !vif->bss_conf.ps);
2063
2064         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2065                        cam, sta_ps_disabled);
2066         /*
2067          * allow tpc only if power management is enabled, or bt coex
2068          * activity grade allows it and we are on 2.4Ghz.
2069          */
2070         if ((cam || sta_ps_disabled) &&
2071             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2072                 return false;
2073
2074         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2075         if (is_legacy(rate))
2076                 return index == IWL_RATE_54M_INDEX;
2077         if (is_ht(rate))
2078                 return index == IWL_RATE_MCS_7_INDEX;
2079         if (is_vht(rate))
2080                 return index == IWL_RATE_MCS_7_INDEX ||
2081                        index == IWL_RATE_MCS_8_INDEX ||
2082                        index == IWL_RATE_MCS_9_INDEX;
2083
2084         WARN_ON_ONCE(1);
2085         return false;
2086 }
2087
2088 enum tpc_action {
2089         TPC_ACTION_STAY,
2090         TPC_ACTION_DECREASE,
2091         TPC_ACTION_INCREASE,
2092         TPC_ACTION_NO_RESTIRCTION,
2093 };
2094
2095 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2096                                          s32 sr, int weak, int strong,
2097                                          int current_tpt,
2098                                          int weak_tpt, int strong_tpt)
2099 {
2100         /* stay until we have valid tpt */
2101         if (current_tpt == IWL_INVALID_VALUE) {
2102                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2103                 return TPC_ACTION_STAY;
2104         }
2105
2106         /* Too many failures, increase txp */
2107         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2108             current_tpt == 0) {
2109                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2110                 return TPC_ACTION_NO_RESTIRCTION;
2111         }
2112
2113         /* try decreasing first if applicable */
2114         if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2115             weak != TPC_INVALID) {
2116                 if (weak_tpt == IWL_INVALID_VALUE &&
2117                     (strong_tpt == IWL_INVALID_VALUE ||
2118                      current_tpt >= strong_tpt)) {
2119                         IWL_DEBUG_RATE(mvm,
2120                                        "no weak txp measurement. decrease txp\n");
2121                         return TPC_ACTION_DECREASE;
2122                 }
2123
2124                 if (weak_tpt > current_tpt) {
2125                         IWL_DEBUG_RATE(mvm,
2126                                        "lower txp has better tpt. decrease txp\n");
2127                         return TPC_ACTION_DECREASE;
2128                 }
2129         }
2130
2131         /* next, increase if needed */
2132         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2133             strong != TPC_INVALID) {
2134                 if (weak_tpt == IWL_INVALID_VALUE &&
2135                     strong_tpt != IWL_INVALID_VALUE &&
2136                     current_tpt < strong_tpt) {
2137                         IWL_DEBUG_RATE(mvm,
2138                                        "higher txp has better tpt. increase txp\n");
2139                         return TPC_ACTION_INCREASE;
2140                 }
2141
2142                 if (weak_tpt < current_tpt &&
2143                     (strong_tpt == IWL_INVALID_VALUE ||
2144                      strong_tpt > current_tpt)) {
2145                         IWL_DEBUG_RATE(mvm,
2146                                        "lower txp has worse tpt. increase txp\n");
2147                         return TPC_ACTION_INCREASE;
2148                 }
2149         }
2150
2151         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2152         return TPC_ACTION_STAY;
2153 }
2154
2155 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2156                            struct ieee80211_sta *sta,
2157                            struct iwl_lq_sta *lq_sta,
2158                            struct iwl_scale_tbl_info *tbl)
2159 {
2160         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2161         struct ieee80211_vif *vif = mvm_sta->vif;
2162         struct ieee80211_chanctx_conf *chanctx_conf;
2163         enum nl80211_band band;
2164         struct iwl_rate_scale_data *window;
2165         struct rs_rate *rate = &tbl->rate;
2166         enum tpc_action action;
2167         s32 sr;
2168         u8 cur = lq_sta->lq.reduced_tpc;
2169         int current_tpt;
2170         int weak, strong;
2171         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2172
2173 #ifdef CONFIG_MAC80211_DEBUGFS
2174         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2175                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2176                                lq_sta->pers.dbg_fixed_txp_reduction);
2177                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2178                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2179         }
2180 #endif
2181
2182         rcu_read_lock();
2183         chanctx_conf = rcu_dereference(vif->chanctx_conf);
2184         if (WARN_ON(!chanctx_conf))
2185                 band = NUM_NL80211_BANDS;
2186         else
2187                 band = chanctx_conf->def.chan->band;
2188         rcu_read_unlock();
2189
2190         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2191                 IWL_DEBUG_RATE(mvm,
2192                                "tpc is not allowed. remove txp restrictions\n");
2193                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2194                 return cur != TPC_NO_REDUCTION;
2195         }
2196
2197         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2198
2199         /* Collect measured throughputs for current and adjacent rates */
2200         window = tbl->tpc_win;
2201         sr = window[cur].success_ratio;
2202         current_tpt = window[cur].average_tpt;
2203         if (weak != TPC_INVALID)
2204                 weak_tpt = window[weak].average_tpt;
2205         if (strong != TPC_INVALID)
2206                 strong_tpt = window[strong].average_tpt;
2207
2208         IWL_DEBUG_RATE(mvm,
2209                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2210                        cur, current_tpt, sr, weak, strong,
2211                        weak_tpt, strong_tpt);
2212
2213         action = rs_get_tpc_action(mvm, sr, weak, strong,
2214                                    current_tpt, weak_tpt, strong_tpt);
2215
2216         /* override actions if we are on the edge */
2217         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2218                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2219                 action = TPC_ACTION_STAY;
2220         } else if (strong == TPC_INVALID &&
2221                    (action == TPC_ACTION_INCREASE ||
2222                     action == TPC_ACTION_NO_RESTIRCTION)) {
2223                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2224                 action = TPC_ACTION_STAY;
2225         }
2226
2227         switch (action) {
2228         case TPC_ACTION_DECREASE:
2229                 lq_sta->lq.reduced_tpc = weak;
2230                 return true;
2231         case TPC_ACTION_INCREASE:
2232                 lq_sta->lq.reduced_tpc = strong;
2233                 return true;
2234         case TPC_ACTION_NO_RESTIRCTION:
2235                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2236                 return true;
2237         case TPC_ACTION_STAY:
2238                 /* do nothing */
2239                 break;
2240         }
2241         return false;
2242 }
2243
2244 /*
2245  * Do rate scaling and search for new modulation mode.
2246  */
2247 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2248                                   struct ieee80211_sta *sta,
2249                                   struct iwl_lq_sta *lq_sta,
2250                                   int tid, bool ndp)
2251 {
2252         int low = IWL_RATE_INVALID;
2253         int high = IWL_RATE_INVALID;
2254         int index;
2255         struct iwl_rate_scale_data *window = NULL;
2256         int current_tpt = IWL_INVALID_VALUE;
2257         int low_tpt = IWL_INVALID_VALUE;
2258         int high_tpt = IWL_INVALID_VALUE;
2259         u32 fail_count;
2260         enum rs_action scale_action = RS_ACTION_STAY;
2261         u16 rate_mask;
2262         u8 update_lq = 0;
2263         struct iwl_scale_tbl_info *tbl, *tbl1;
2264         u8 active_tbl = 0;
2265         u8 done_search = 0;
2266         u16 high_low;
2267         s32 sr;
2268         u8 prev_agg = lq_sta->is_agg;
2269         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2270         struct rs_rate *rate;
2271
2272         lq_sta->is_agg = !!mvmsta->agg_tids;
2273
2274         /*
2275          * Select rate-scale / modulation-mode table to work with in
2276          * the rest of this function:  "search" if searching for better
2277          * modulation mode, or "active" if doing rate scaling within a mode.
2278          */
2279         if (!lq_sta->search_better_tbl)
2280                 active_tbl = lq_sta->active_tbl;
2281         else
2282                 active_tbl = 1 - lq_sta->active_tbl;
2283
2284         tbl = &(lq_sta->lq_info[active_tbl]);
2285         rate = &tbl->rate;
2286
2287         if (prev_agg != lq_sta->is_agg) {
2288                 IWL_DEBUG_RATE(mvm,
2289                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2290                                prev_agg, lq_sta->is_agg);
2291                 rs_set_expected_tpt_table(lq_sta, tbl);
2292                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2293         }
2294
2295         /* current tx rate */
2296         index = rate->index;
2297
2298         /* rates available for this association, and for modulation mode */
2299         rate_mask = rs_get_supported_rates(lq_sta, rate);
2300
2301         if (!(BIT(index) & rate_mask)) {
2302                 IWL_ERR(mvm, "Current Rate is not valid\n");
2303                 if (lq_sta->search_better_tbl) {
2304                         /* revert to active table if search table is not valid*/
2305                         rate->type = LQ_NONE;
2306                         lq_sta->search_better_tbl = 0;
2307                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2308                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2309                 }
2310                 return;
2311         }
2312
2313         /* Get expected throughput table and history window for current rate */
2314         if (!tbl->expected_tpt) {
2315                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2316                 return;
2317         }
2318
2319         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2320         window = &(tbl->win[index]);
2321
2322         /*
2323          * If there is not enough history to calculate actual average
2324          * throughput, keep analyzing results of more tx frames, without
2325          * changing rate or mode (bypass most of the rest of this function).
2326          * Set up new rate table in uCode only if old rate is not supported
2327          * in current association (use new rate found above).
2328          */
2329         fail_count = window->counter - window->success_counter;
2330         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2331             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2332                 IWL_DEBUG_RATE(mvm,
2333                                "%s: Test Window: succ %d total %d\n",
2334                                rs_pretty_rate(rate),
2335                                window->success_counter, window->counter);
2336
2337                 /* Can't calculate this yet; not enough history */
2338                 window->average_tpt = IWL_INVALID_VALUE;
2339
2340                 /* Should we stay with this modulation mode,
2341                  * or search for a new one? */
2342                 rs_stay_in_table(lq_sta, false);
2343
2344                 return;
2345         }
2346
2347         /* If we are searching for better modulation mode, check success. */
2348         if (lq_sta->search_better_tbl) {
2349                 /* If good success, continue using the "search" mode;
2350                  * no need to send new link quality command, since we're
2351                  * continuing to use the setup that we've been trying. */
2352                 if (window->average_tpt > lq_sta->last_tpt) {
2353                         IWL_DEBUG_RATE(mvm,
2354                                        "SWITCHING TO NEW TABLE SR: %d "
2355                                        "cur-tpt %d old-tpt %d\n",
2356                                        window->success_ratio,
2357                                        window->average_tpt,
2358                                        lq_sta->last_tpt);
2359
2360                         /* Swap tables; "search" becomes "active" */
2361                         lq_sta->active_tbl = active_tbl;
2362                         current_tpt = window->average_tpt;
2363                 /* Else poor success; go back to mode in "active" table */
2364                 } else {
2365                         IWL_DEBUG_RATE(mvm,
2366                                        "GOING BACK TO THE OLD TABLE: SR %d "
2367                                        "cur-tpt %d old-tpt %d\n",
2368                                        window->success_ratio,
2369                                        window->average_tpt,
2370                                        lq_sta->last_tpt);
2371
2372                         /* Nullify "search" table */
2373                         rate->type = LQ_NONE;
2374
2375                         /* Revert to "active" table */
2376                         active_tbl = lq_sta->active_tbl;
2377                         tbl = &(lq_sta->lq_info[active_tbl]);
2378
2379                         /* Revert to "active" rate and throughput info */
2380                         index = tbl->rate.index;
2381                         current_tpt = lq_sta->last_tpt;
2382
2383                         /* Need to set up a new rate table in uCode */
2384                         update_lq = 1;
2385                 }
2386
2387                 /* Either way, we've made a decision; modulation mode
2388                  * search is done, allow rate adjustment next time. */
2389                 lq_sta->search_better_tbl = 0;
2390                 done_search = 1;        /* Don't switch modes below! */
2391                 goto lq_update;
2392         }
2393
2394         /* (Else) not in search of better modulation mode, try for better
2395          * starting rate, while staying in this mode. */
2396         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2397         low = high_low & 0xff;
2398         high = (high_low >> 8) & 0xff;
2399
2400         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2401
2402         sr = window->success_ratio;
2403
2404         /* Collect measured throughputs for current and adjacent rates */
2405         current_tpt = window->average_tpt;
2406         if (low != IWL_RATE_INVALID)
2407                 low_tpt = tbl->win[low].average_tpt;
2408         if (high != IWL_RATE_INVALID)
2409                 high_tpt = tbl->win[high].average_tpt;
2410
2411         IWL_DEBUG_RATE(mvm,
2412                        "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2413                        rs_pretty_rate(rate), current_tpt, sr,
2414                        low, high, low_tpt, high_tpt);
2415
2416         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2417                                           current_tpt, low_tpt, high_tpt);
2418
2419         /* Force a search in case BT doesn't like us being in MIMO */
2420         if (is_mimo(rate) &&
2421             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2422                 IWL_DEBUG_RATE(mvm,
2423                                "BT Coex forbids MIMO. Search for new config\n");
2424                 rs_stay_in_table(lq_sta, true);
2425                 goto lq_update;
2426         }
2427
2428         switch (scale_action) {
2429         case RS_ACTION_DOWNSCALE:
2430                 /* Decrease starting rate, update uCode's rate table */
2431                 if (low != IWL_RATE_INVALID) {
2432                         update_lq = 1;
2433                         index = low;
2434                 } else {
2435                         IWL_DEBUG_RATE(mvm,
2436                                        "At the bottom rate. Can't decrease\n");
2437                 }
2438
2439                 break;
2440         case RS_ACTION_UPSCALE:
2441                 /* Increase starting rate, update uCode's rate table */
2442                 if (high != IWL_RATE_INVALID) {
2443                         update_lq = 1;
2444                         index = high;
2445                 } else {
2446                         IWL_DEBUG_RATE(mvm,
2447                                        "At the top rate. Can't increase\n");
2448                 }
2449
2450                 break;
2451         case RS_ACTION_STAY:
2452                 /* No change */
2453                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2454                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2455                 break;
2456         default:
2457                 break;
2458         }
2459
2460 lq_update:
2461         /* Replace uCode's rate table for the destination station. */
2462         if (update_lq) {
2463                 tbl->rate.index = index;
2464                 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2465                         rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2466                 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2467                 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2468         }
2469
2470         rs_stay_in_table(lq_sta, false);
2471
2472         /*
2473          * Search for new modulation mode if we're:
2474          * 1)  Not changing rates right now
2475          * 2)  Not just finishing up a search
2476          * 3)  Allowing a new search
2477          */
2478         if (!update_lq && !done_search &&
2479             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2480             && window->counter) {
2481                 enum rs_column next_column;
2482
2483                 /* Save current throughput to compare with "search" throughput*/
2484                 lq_sta->last_tpt = current_tpt;
2485
2486                 IWL_DEBUG_RATE(mvm,
2487                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2488                                update_lq, done_search, lq_sta->rs_state,
2489                                window->counter);
2490
2491                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2492                 if (next_column != RS_COLUMN_INVALID) {
2493                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2494                                                       next_column);
2495                         if (!ret)
2496                                 lq_sta->search_better_tbl = 1;
2497                 } else {
2498                         IWL_DEBUG_RATE(mvm,
2499                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2500                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2501                 }
2502
2503                 /* If new "search" mode was selected, set up in uCode table */
2504                 if (lq_sta->search_better_tbl) {
2505                         /* Access the "search" table, clear its history. */
2506                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2507                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2508
2509                         /* Use new "search" start rate */
2510                         index = tbl->rate.index;
2511
2512                         rs_dump_rate(mvm, &tbl->rate,
2513                                      "Switch to SEARCH TABLE:");
2514                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2515                 } else {
2516                         done_search = 1;
2517                 }
2518         }
2519
2520         if (!ndp)
2521                 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2522
2523         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2524                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2525                 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2526         }
2527 }
2528
2529 struct rs_init_rate_info {
2530         s8 rssi;
2531         u8 rate_idx;
2532 };
2533
2534 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2535         { -60, IWL_RATE_54M_INDEX },
2536         { -64, IWL_RATE_48M_INDEX },
2537         { -68, IWL_RATE_36M_INDEX },
2538         { -80, IWL_RATE_24M_INDEX },
2539         { -84, IWL_RATE_18M_INDEX },
2540         { -85, IWL_RATE_12M_INDEX },
2541         { -86, IWL_RATE_11M_INDEX },
2542         { -88, IWL_RATE_5M_INDEX  },
2543         { -90, IWL_RATE_2M_INDEX  },
2544         { S8_MIN, IWL_RATE_1M_INDEX },
2545 };
2546
2547 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2548         { -60, IWL_RATE_54M_INDEX },
2549         { -64, IWL_RATE_48M_INDEX },
2550         { -72, IWL_RATE_36M_INDEX },
2551         { -80, IWL_RATE_24M_INDEX },
2552         { -84, IWL_RATE_18M_INDEX },
2553         { -85, IWL_RATE_12M_INDEX },
2554         { -87, IWL_RATE_9M_INDEX  },
2555         { S8_MIN, IWL_RATE_6M_INDEX },
2556 };
2557
2558 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2559         { -60, IWL_RATE_MCS_7_INDEX },
2560         { -64, IWL_RATE_MCS_6_INDEX },
2561         { -68, IWL_RATE_MCS_5_INDEX },
2562         { -72, IWL_RATE_MCS_4_INDEX },
2563         { -80, IWL_RATE_MCS_3_INDEX },
2564         { -84, IWL_RATE_MCS_2_INDEX },
2565         { -85, IWL_RATE_MCS_1_INDEX },
2566         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2567 };
2568
2569 /* MCS index 9 is not valid for 20MHz VHT channel width,
2570  * but is ok for 40, 80 and 160MHz channels.
2571  */
2572 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2573         { -60, IWL_RATE_MCS_8_INDEX },
2574         { -64, IWL_RATE_MCS_7_INDEX },
2575         { -68, IWL_RATE_MCS_6_INDEX },
2576         { -72, IWL_RATE_MCS_5_INDEX },
2577         { -80, IWL_RATE_MCS_4_INDEX },
2578         { -84, IWL_RATE_MCS_3_INDEX },
2579         { -85, IWL_RATE_MCS_2_INDEX },
2580         { -87, IWL_RATE_MCS_1_INDEX },
2581         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2582 };
2583
2584 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2585         { -60, IWL_RATE_MCS_9_INDEX },
2586         { -64, IWL_RATE_MCS_8_INDEX },
2587         { -68, IWL_RATE_MCS_7_INDEX },
2588         { -72, IWL_RATE_MCS_6_INDEX },
2589         { -80, IWL_RATE_MCS_5_INDEX },
2590         { -84, IWL_RATE_MCS_4_INDEX },
2591         { -85, IWL_RATE_MCS_3_INDEX },
2592         { -87, IWL_RATE_MCS_2_INDEX },
2593         { -88, IWL_RATE_MCS_1_INDEX },
2594         { S8_MIN, IWL_RATE_MCS_0_INDEX },
2595 };
2596
2597 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2598
2599 /* Init the optimal rate based on STA caps
2600  * This combined with rssi is used to report the last tx rate
2601  * to userspace when we haven't transmitted enough frames.
2602  */
2603 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2604                                  struct ieee80211_sta *sta,
2605                                  struct iwl_lq_sta *lq_sta)
2606 {
2607         struct rs_rate *rate = &lq_sta->optimal_rate;
2608
2609         if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2610                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2611         else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2612                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2613         else if (lq_sta->band == NL80211_BAND_5GHZ)
2614                 rate->type = LQ_LEGACY_A;
2615         else
2616                 rate->type = LQ_LEGACY_G;
2617
2618         rate->bw = rs_bw_from_sta_bw(sta);
2619         rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2620
2621         /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2622
2623         if (is_mimo(rate)) {
2624                 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2625         } else if (is_siso(rate)) {
2626                 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2627         } else {
2628                 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2629
2630                 if (lq_sta->band == NL80211_BAND_5GHZ) {
2631                         lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2632                         lq_sta->optimal_nentries =
2633                                 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2634                 } else {
2635                         lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2636                         lq_sta->optimal_nentries =
2637                                 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2638                 }
2639         }
2640
2641         if (is_vht(rate)) {
2642                 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2643                         lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2644                         lq_sta->optimal_nentries =
2645                                 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2646                 } else {
2647                         lq_sta->optimal_rates = rs_optimal_rates_vht;
2648                         lq_sta->optimal_nentries =
2649                                 ARRAY_SIZE(rs_optimal_rates_vht);
2650                 }
2651         } else if (is_ht(rate)) {
2652                 lq_sta->optimal_rates = rs_optimal_rates_ht;
2653                 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2654         }
2655 }
2656
2657 /* Compute the optimal rate index based on RSSI */
2658 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2659                                            struct iwl_lq_sta *lq_sta)
2660 {
2661         struct rs_rate *rate = &lq_sta->optimal_rate;
2662         int i;
2663
2664         rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2665                                      BITS_PER_LONG);
2666
2667         for (i = 0; i < lq_sta->optimal_nentries; i++) {
2668                 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2669
2670                 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2671                     (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2672                         rate->index = rate_idx;
2673                         break;
2674                 }
2675         }
2676
2677         return rate;
2678 }
2679
2680 /* Choose an initial legacy rate and antenna to use based on the RSSI
2681  * of last Rx
2682  */
2683 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2684                                 struct ieee80211_sta *sta,
2685                                 struct iwl_lq_sta *lq_sta,
2686                                 enum nl80211_band band,
2687                                 struct rs_rate *rate)
2688 {
2689         int i, nentries;
2690         unsigned long active_rate;
2691         s8 best_rssi = S8_MIN;
2692         u8 best_ant = ANT_NONE;
2693         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2694         const struct rs_init_rate_info *initial_rates;
2695
2696         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2697                 if (!(lq_sta->pers.chains & BIT(i)))
2698                         continue;
2699
2700                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2701                         best_rssi = lq_sta->pers.chain_signal[i];
2702                         best_ant = BIT(i);
2703                 }
2704         }
2705
2706         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2707                        rs_pretty_ant(best_ant), best_rssi);
2708
2709         if (best_ant != ANT_A && best_ant != ANT_B)
2710                 rate->ant = first_antenna(valid_tx_ant);
2711         else
2712                 rate->ant = best_ant;
2713
2714         rate->sgi = false;
2715         rate->ldpc = false;
2716         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2717
2718         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2719                                      BITS_PER_LONG);
2720
2721         if (band == NL80211_BAND_5GHZ) {
2722                 rate->type = LQ_LEGACY_A;
2723                 initial_rates = rs_optimal_rates_5ghz_legacy;
2724                 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2725         } else {
2726                 rate->type = LQ_LEGACY_G;
2727                 initial_rates = rs_optimal_rates_24ghz_legacy;
2728                 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2729         }
2730
2731         if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2732                 goto out;
2733
2734         /* Start from a higher rate if the corresponding debug capability
2735          * is enabled. The rate is chosen according to AP capabilities.
2736          * In case of VHT/HT when the rssi is low fallback to the case of
2737          * legacy rates.
2738          */
2739         if (sta->vht_cap.vht_supported &&
2740             best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2741                 switch (sta->bandwidth) {
2742                 case IEEE80211_STA_RX_BW_160:
2743                 case IEEE80211_STA_RX_BW_80:
2744                 case IEEE80211_STA_RX_BW_40:
2745                         initial_rates = rs_optimal_rates_vht;
2746                         nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2747                         break;
2748                 case IEEE80211_STA_RX_BW_20:
2749                         initial_rates = rs_optimal_rates_vht_20mhz;
2750                         nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2751                         break;
2752                 default:
2753                         IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2754                         goto out;
2755                 }
2756
2757                 active_rate = lq_sta->active_siso_rate;
2758                 rate->type = LQ_VHT_SISO;
2759                 rate->bw = rs_bw_from_sta_bw(sta);
2760         } else if (sta->ht_cap.ht_supported &&
2761                    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2762                 initial_rates = rs_optimal_rates_ht;
2763                 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2764                 active_rate = lq_sta->active_siso_rate;
2765                 rate->type = LQ_HT_SISO;
2766         } else {
2767                 active_rate = lq_sta->active_legacy_rate;
2768         }
2769
2770         for (i = 0; i < nentries; i++) {
2771                 int rate_idx = initial_rates[i].rate_idx;
2772
2773                 if ((best_rssi >= initial_rates[i].rssi) &&
2774                     (BIT(rate_idx) & active_rate)) {
2775                         rate->index = rate_idx;
2776                         break;
2777                 }
2778         }
2779
2780 out:
2781         rs_dump_rate(mvm, rate, "INITIAL");
2782 }
2783
2784 /* Save info about RSSI of last Rx */
2785 void rs_update_last_rssi(struct iwl_mvm *mvm,
2786                          struct iwl_mvm_sta *mvmsta,
2787                          struct ieee80211_rx_status *rx_status)
2788 {
2789         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2790         int i;
2791
2792         lq_sta->pers.chains = rx_status->chains;
2793         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2794         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2795         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2796         lq_sta->pers.last_rssi = S8_MIN;
2797
2798         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2799                 if (!(lq_sta->pers.chains & BIT(i)))
2800                         continue;
2801
2802                 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2803                         lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2804         }
2805 }
2806
2807 /**
2808  * rs_initialize_lq - Initialize a station's hardware rate table
2809  *
2810  * The uCode's station table contains a table of fallback rates
2811  * for automatic fallback during transmission.
2812  *
2813  * NOTE: This sets up a default set of values.  These will be replaced later
2814  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2815  *       rc80211_simple.
2816  *
2817  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2818  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2819  *       which requires station table entry to exist).
2820  */
2821 static void rs_initialize_lq(struct iwl_mvm *mvm,
2822                              struct ieee80211_sta *sta,
2823                              struct iwl_lq_sta *lq_sta,
2824                              enum nl80211_band band,
2825                              bool init)
2826 {
2827         struct iwl_scale_tbl_info *tbl;
2828         struct rs_rate *rate;
2829         u8 active_tbl = 0;
2830
2831         if (!sta || !lq_sta)
2832                 return;
2833
2834         if (!lq_sta->search_better_tbl)
2835                 active_tbl = lq_sta->active_tbl;
2836         else
2837                 active_tbl = 1 - lq_sta->active_tbl;
2838
2839         tbl = &(lq_sta->lq_info[active_tbl]);
2840         rate = &tbl->rate;
2841
2842         rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2843         rs_init_optimal_rate(mvm, sta, lq_sta);
2844
2845         WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2846                   "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2847                   rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2848                   mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2849
2850         tbl->column = rs_get_column_from_rate(rate);
2851
2852         rs_set_expected_tpt_table(lq_sta, tbl);
2853         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2854         /* TODO restore station should remember the lq cmd */
2855         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2856 }
2857
2858 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
2859                             void *mvm_sta,
2860                             struct ieee80211_tx_rate_control *txrc)
2861 {
2862         struct iwl_op_mode *op_mode = mvm_r;
2863         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2864         struct sk_buff *skb = txrc->skb;
2865         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2866         struct iwl_lq_sta *lq_sta;
2867         struct rs_rate *optimal_rate;
2868         u32 last_ucode_rate;
2869
2870         if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2871                 /* if vif isn't initialized mvm doesn't know about
2872                  * this station, so don't do anything with the it
2873                  */
2874                 sta = NULL;
2875                 mvm_sta = NULL;
2876         }
2877
2878         /* Send management frames and NO_ACK data using lowest rate. */
2879         if (rate_control_send_low(sta, mvm_sta, txrc))
2880                 return;
2881
2882         if (!mvm_sta)
2883                 return;
2884
2885         lq_sta = mvm_sta;
2886         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2887                                   info->band, &info->control.rates[0]);
2888         info->control.rates[0].count = 1;
2889
2890         /* Report the optimal rate based on rssi and STA caps if we haven't
2891          * converged yet (too little traffic) or exploring other modulations
2892          */
2893         if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2894                 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2895                 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2896                                                           optimal_rate);
2897                 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2898                                           &txrc->reported_rate);
2899         }
2900 }
2901
2902 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2903                               gfp_t gfp)
2904 {
2905         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2906         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2907         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2908         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2909
2910         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2911
2912         lq_sta->pers.drv = mvm;
2913 #ifdef CONFIG_MAC80211_DEBUGFS
2914         lq_sta->pers.dbg_fixed_rate = 0;
2915         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2916         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2917 #endif
2918         lq_sta->pers.chains = 0;
2919         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2920         lq_sta->pers.last_rssi = S8_MIN;
2921
2922         return lq_sta;
2923 }
2924
2925 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2926                                        int nss)
2927 {
2928         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2929                 (0x3 << (2 * (nss - 1)));
2930         rx_mcs >>= (2 * (nss - 1));
2931
2932         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2933                 return IWL_RATE_MCS_7_INDEX;
2934         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2935                 return IWL_RATE_MCS_8_INDEX;
2936         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2937                 return IWL_RATE_MCS_9_INDEX;
2938
2939         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2940         return -1;
2941 }
2942
2943 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2944                                      struct ieee80211_sta_vht_cap *vht_cap,
2945                                      struct iwl_lq_sta *lq_sta)
2946 {
2947         int i;
2948         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2949
2950         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2951                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2952                         if (i == IWL_RATE_9M_INDEX)
2953                                 continue;
2954
2955                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2956                         if (i == IWL_RATE_MCS_9_INDEX &&
2957                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2958                                 continue;
2959
2960                         lq_sta->active_siso_rate |= BIT(i);
2961                 }
2962         }
2963
2964         if (sta->rx_nss < 2)
2965                 return;
2966
2967         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2968         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2969                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2970                         if (i == IWL_RATE_9M_INDEX)
2971                                 continue;
2972
2973                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2974                         if (i == IWL_RATE_MCS_9_INDEX &&
2975                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2976                                 continue;
2977
2978                         lq_sta->active_mimo2_rate |= BIT(i);
2979                 }
2980         }
2981 }
2982
2983 static void rs_ht_init(struct iwl_mvm *mvm,
2984                        struct ieee80211_sta *sta,
2985                        struct iwl_lq_sta *lq_sta,
2986                        struct ieee80211_sta_ht_cap *ht_cap)
2987 {
2988         /* active_siso_rate mask includes 9 MBits (bit 5),
2989          * and CCK (bits 0-3), supp_rates[] does not;
2990          * shift to convert format, force 9 MBits off.
2991          */
2992         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2993         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2994         lq_sta->active_siso_rate &= ~((u16)0x2);
2995         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2996
2997         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2998         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2999         lq_sta->active_mimo2_rate &= ~((u16)0x2);
3000         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
3001
3002         if (mvm->cfg->ht_params->ldpc &&
3003             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
3004                 lq_sta->ldpc = true;
3005
3006         if (mvm->cfg->ht_params->stbc &&
3007             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3008             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3009                 lq_sta->stbc_capable = true;
3010
3011         lq_sta->is_vht = false;
3012 }
3013
3014 static void rs_vht_init(struct iwl_mvm *mvm,
3015                         struct ieee80211_sta *sta,
3016                         struct iwl_lq_sta *lq_sta,
3017                         struct ieee80211_sta_vht_cap *vht_cap)
3018 {
3019         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
3020
3021         if (mvm->cfg->ht_params->ldpc &&
3022             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3023                 lq_sta->ldpc = true;
3024
3025         if (mvm->cfg->ht_params->stbc &&
3026             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3027             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3028                 lq_sta->stbc_capable = true;
3029
3030         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3031             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3032             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3033                 lq_sta->bfer_capable = true;
3034
3035         lq_sta->is_vht = true;
3036 }
3037
3038 #ifdef CONFIG_IWLWIFI_DEBUGFS
3039 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3040 {
3041         spin_lock_bh(&mvm->drv_stats_lock);
3042         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3043         spin_unlock_bh(&mvm->drv_stats_lock);
3044 }
3045
3046 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3047 {
3048         u8 nss = 0;
3049
3050         spin_lock(&mvm->drv_stats_lock);
3051
3052         if (agg)
3053                 mvm->drv_rx_stats.agg_frames++;
3054
3055         mvm->drv_rx_stats.success_frames++;
3056
3057         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3058         case RATE_MCS_CHAN_WIDTH_20:
3059                 mvm->drv_rx_stats.bw_20_frames++;
3060                 break;
3061         case RATE_MCS_CHAN_WIDTH_40:
3062                 mvm->drv_rx_stats.bw_40_frames++;
3063                 break;
3064         case RATE_MCS_CHAN_WIDTH_80:
3065                 mvm->drv_rx_stats.bw_80_frames++;
3066                 break;
3067         case RATE_MCS_CHAN_WIDTH_160:
3068                 mvm->drv_rx_stats.bw_160_frames++;
3069                 break;
3070         default:
3071                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3072         }
3073
3074         if (rate & RATE_MCS_HT_MSK) {
3075                 mvm->drv_rx_stats.ht_frames++;
3076                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3077         } else if (rate & RATE_MCS_VHT_MSK) {
3078                 mvm->drv_rx_stats.vht_frames++;
3079                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3080                        RATE_VHT_MCS_NSS_POS) + 1;
3081         } else {
3082                 mvm->drv_rx_stats.legacy_frames++;
3083         }
3084
3085         if (nss == 1)
3086                 mvm->drv_rx_stats.siso_frames++;
3087         else if (nss == 2)
3088                 mvm->drv_rx_stats.mimo2_frames++;
3089
3090         if (rate & RATE_MCS_SGI_MSK)
3091                 mvm->drv_rx_stats.sgi_frames++;
3092         else
3093                 mvm->drv_rx_stats.ngi_frames++;
3094
3095         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3096         mvm->drv_rx_stats.last_frame_idx =
3097                 (mvm->drv_rx_stats.last_frame_idx + 1) %
3098                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3099
3100         spin_unlock(&mvm->drv_stats_lock);
3101 }
3102 #endif
3103
3104 /*
3105  * Called after adding a new station to initialize rate scaling
3106  */
3107 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3108                              enum nl80211_band band, bool init)
3109 {
3110         int i, j;
3111         struct ieee80211_hw *hw = mvm->hw;
3112         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3113         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3114         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3115         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
3116         struct ieee80211_supported_band *sband;
3117         unsigned long supp; /* must be unsigned long for for_each_set_bit */
3118
3119         /* clear all non-persistent lq data */
3120         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3121
3122         sband = hw->wiphy->bands[band];
3123
3124         lq_sta->lq.sta_id = mvmsta->sta_id;
3125         mvmsta->tlc_amsdu = false;
3126
3127         for (j = 0; j < LQ_SIZE; j++)
3128                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3129
3130         lq_sta->flush_timer = 0;
3131         lq_sta->last_tx = jiffies;
3132
3133         IWL_DEBUG_RATE(mvm,
3134                        "LQ: *** rate scale station global init for station %d ***\n",
3135                        mvmsta->sta_id);
3136         /* TODO: what is a good starting rate for STA? About middle? Maybe not
3137          * the lowest or the highest rate.. Could consider using RSSI from
3138          * previous packets? Need to have IEEE 802.1X auth succeed immediately
3139          * after assoc.. */
3140
3141         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3142         lq_sta->band = sband->band;
3143         /*
3144          * active legacy rates as per supported rates bitmap
3145          */
3146         supp = sta->supp_rates[sband->band];
3147         lq_sta->active_legacy_rate = 0;
3148         for_each_set_bit(i, &supp, BITS_PER_LONG)
3149                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3150
3151         /* TODO: should probably account for rx_highest for both HT/VHT */
3152         if (!vht_cap || !vht_cap->vht_supported)
3153                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3154         else
3155                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3156
3157         lq_sta->max_legacy_rate_idx =
3158                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3159         lq_sta->max_siso_rate_idx =
3160                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3161         lq_sta->max_mimo2_rate_idx =
3162                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3163
3164         IWL_DEBUG_RATE(mvm,
3165                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3166                        lq_sta->active_legacy_rate,
3167                        lq_sta->active_siso_rate,
3168                        lq_sta->active_mimo2_rate,
3169                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3170                        lq_sta->bfer_capable);
3171         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3172                        lq_sta->max_legacy_rate_idx,
3173                        lq_sta->max_siso_rate_idx,
3174                        lq_sta->max_mimo2_rate_idx);
3175
3176         /* These values will be overridden later */
3177         lq_sta->lq.single_stream_ant_msk =
3178                 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3179         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3180
3181         /* as default allow aggregation for all tids */
3182         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3183         lq_sta->is_agg = 0;
3184 #ifdef CONFIG_IWLWIFI_DEBUGFS
3185         iwl_mvm_reset_frame_stats(mvm);
3186 #endif
3187         rs_initialize_lq(mvm, sta, lq_sta, band, init);
3188 }
3189
3190 static void rs_drv_rate_update(void *mvm_r,
3191                                struct ieee80211_supported_band *sband,
3192                                struct cfg80211_chan_def *chandef,
3193                                struct ieee80211_sta *sta,
3194                                void *priv_sta, u32 changed)
3195 {
3196         struct iwl_op_mode *op_mode = mvm_r;
3197         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3198         u8 tid;
3199
3200         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3201                 return;
3202
3203         /* Stop any ongoing aggregations as rs starts off assuming no agg */
3204         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3205                 ieee80211_stop_tx_ba_session(sta, tid);
3206
3207         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3208 }
3209
3210 #ifdef CONFIG_MAC80211_DEBUGFS
3211 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3212                                             struct iwl_lq_cmd *lq_cmd,
3213                                             enum nl80211_band band,
3214                                             u32 ucode_rate)
3215 {
3216         struct rs_rate rate;
3217         int i;
3218         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3219         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3220         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3221
3222         for (i = 0; i < num_rates; i++)
3223                 lq_cmd->rs_table[i] = ucode_rate_le32;
3224
3225         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
3226
3227         if (is_mimo(&rate))
3228                 lq_cmd->mimo_delim = num_rates - 1;
3229         else
3230                 lq_cmd->mimo_delim = 0;
3231
3232         lq_cmd->reduced_tpc = 0;
3233
3234         if (num_of_ant(ant) == 1)
3235                 lq_cmd->single_stream_ant_msk = ant;
3236
3237         if (!mvm->trans->cfg->gen2)
3238                 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3239         else
3240                 lq_cmd->agg_frame_cnt_limit =
3241                         LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3242 }
3243 #endif /* CONFIG_MAC80211_DEBUGFS */
3244
3245 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3246                                      struct iwl_lq_sta *lq_sta,
3247                                      struct rs_rate *rate,
3248                                      __le32 *rs_table, int *rs_table_index,
3249                                      int num_rates, int num_retries,
3250                                      u8 valid_tx_ant, bool toggle_ant)
3251 {
3252         int i, j;
3253         __le32 ucode_rate;
3254         bool bottom_reached = false;
3255         int prev_rate_idx = rate->index;
3256         int end = LINK_QUAL_MAX_RETRY_NUM;
3257         int index = *rs_table_index;
3258
3259         for (i = 0; i < num_rates && index < end; i++) {
3260                 for (j = 0; j < num_retries && index < end; j++, index++) {
3261                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3262                                                                          rate));
3263                         rs_table[index] = ucode_rate;
3264                         if (toggle_ant)
3265                                 rs_toggle_antenna(valid_tx_ant, rate);
3266                 }
3267
3268                 prev_rate_idx = rate->index;
3269                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3270                 if (bottom_reached && !is_legacy(rate))
3271                         break;
3272         }
3273
3274         if (!bottom_reached && !is_legacy(rate))
3275                 rate->index = prev_rate_idx;
3276
3277         *rs_table_index = index;
3278 }
3279
3280 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3281  * column the rate table should look like this:
3282  *
3283  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3284  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3285  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3286  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3287  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3288  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3289  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3290  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3291  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3292  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3293  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3294  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3295  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3296  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3297  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3298  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3299  */
3300 static void rs_build_rates_table(struct iwl_mvm *mvm,
3301                                  struct ieee80211_sta *sta,
3302                                  struct iwl_lq_sta *lq_sta,
3303                                  const struct rs_rate *initial_rate)
3304 {
3305         struct rs_rate rate;
3306         int num_rates, num_retries, index = 0;
3307         u8 valid_tx_ant = 0;
3308         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3309         bool toggle_ant = false;
3310         u32 color;
3311
3312         memcpy(&rate, initial_rate, sizeof(rate));
3313
3314         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3315
3316         /* TODO: remove old API when min FW API hits 14 */
3317         if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3318             rs_stbc_allow(mvm, sta, lq_sta))
3319                 rate.stbc = true;
3320
3321         if (is_siso(&rate)) {
3322                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3323                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3324         } else if (is_mimo(&rate)) {
3325                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3326                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3327         } else {
3328                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3329                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3330                 toggle_ant = true;
3331         }
3332
3333         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3334                                  num_rates, num_retries, valid_tx_ant,
3335                                  toggle_ant);
3336
3337         rs_get_lower_rate_down_column(lq_sta, &rate);
3338
3339         if (is_siso(&rate)) {
3340                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3341                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3342                 lq_cmd->mimo_delim = index;
3343         } else if (is_legacy(&rate)) {
3344                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3345                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3346         } else {
3347                 WARN_ON_ONCE(1);
3348         }
3349
3350         toggle_ant = true;
3351
3352         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3353                                  num_rates, num_retries, valid_tx_ant,
3354                                  toggle_ant);
3355
3356         rs_get_lower_rate_down_column(lq_sta, &rate);
3357
3358         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3359         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3360
3361         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3362                                  num_rates, num_retries, valid_tx_ant,
3363                                  toggle_ant);
3364
3365         /* update the color of the LQ command (as a counter at bits 1-3) */
3366         color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3367         lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3368 }
3369
3370 struct rs_bfer_active_iter_data {
3371         struct ieee80211_sta *exclude_sta;
3372         struct iwl_mvm_sta *bfer_mvmsta;
3373 };
3374
3375 static void rs_bfer_active_iter(void *_data,
3376                                 struct ieee80211_sta *sta)
3377 {
3378         struct rs_bfer_active_iter_data *data = _data;
3379         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3380         struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq;
3381         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3382
3383         if (sta == data->exclude_sta)
3384                 return;
3385
3386         /* The current sta has BFER allowed */
3387         if (ss_params & LQ_SS_BFER_ALLOWED) {
3388                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3389
3390                 data->bfer_mvmsta = mvmsta;
3391         }
3392 }
3393
3394 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3395 {
3396         int prio = -1;
3397         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3398
3399         switch (viftype) {
3400         case NL80211_IFTYPE_AP:
3401         case NL80211_IFTYPE_P2P_GO:
3402                 prio = 3;
3403                 break;
3404         case NL80211_IFTYPE_P2P_CLIENT:
3405                 prio = 2;
3406                 break;
3407         case NL80211_IFTYPE_STATION:
3408                 prio = 1;
3409                 break;
3410         default:
3411                 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3412                 prio = -1;
3413         }
3414
3415         return prio;
3416 }
3417
3418 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3419 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3420                                 struct iwl_mvm_sta *sta2)
3421 {
3422         int prio1 = rs_bfer_priority(sta1);
3423         int prio2 = rs_bfer_priority(sta2);
3424
3425         if (prio1 > prio2)
3426                 return 1;
3427         if (prio1 < prio2)
3428                 return -1;
3429         return 0;
3430 }
3431
3432 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3433                                 struct ieee80211_sta *sta,
3434                                 struct iwl_lq_sta *lq_sta,
3435                                 const struct rs_rate *initial_rate)
3436 {
3437         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3438         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3439         struct rs_bfer_active_iter_data data = {
3440                 .exclude_sta = sta,
3441                 .bfer_mvmsta = NULL,
3442         };
3443         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3444         u32 ss_params = LQ_SS_PARAMS_VALID;
3445
3446         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3447                 goto out;
3448
3449 #ifdef CONFIG_MAC80211_DEBUGFS
3450         /* Check if forcing the decision is configured.
3451          * Note that SISO is forced by not allowing STBC or BFER
3452          */
3453         if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3454                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3455         else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3456                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3457
3458         if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3459                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3460                                lq_sta->pers.ss_force);
3461                 goto out;
3462         }
3463 #endif
3464
3465         if (lq_sta->stbc_capable)
3466                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3467
3468         if (!lq_sta->bfer_capable)
3469                 goto out;
3470
3471         ieee80211_iterate_stations_atomic(mvm->hw,
3472                                           rs_bfer_active_iter,
3473                                           &data);
3474         bfer_mvmsta = data.bfer_mvmsta;
3475
3476         /* This code is safe as it doesn't run concurrently for different
3477          * stations. This is guaranteed by the fact that calls to
3478          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3479          */
3480         if (!bfer_mvmsta) {
3481                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3482
3483                 ss_params |= LQ_SS_BFER_ALLOWED;
3484                 goto out;
3485         }
3486
3487         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3488                        bfer_mvmsta->sta_id);
3489
3490         /* Disallow BFER on another STA if active and we're a higher priority */
3491         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3492                 struct iwl_lq_cmd *bfersta_lq_cmd =
3493                         &bfer_mvmsta->lq_sta.rs_drv.lq;
3494                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3495
3496                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3497                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3498                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3499
3500                 ss_params |= LQ_SS_BFER_ALLOWED;
3501                 IWL_DEBUG_RATE(mvm,
3502                                "Lower priority BFER sta found (%d). Switch BFER\n",
3503                                bfer_mvmsta->sta_id);
3504         }
3505 out:
3506         lq_cmd->ss_params = cpu_to_le32(ss_params);
3507 }
3508
3509 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3510                            struct ieee80211_sta *sta,
3511                            struct iwl_lq_sta *lq_sta,
3512                            const struct rs_rate *initial_rate)
3513 {
3514         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3515         struct iwl_mvm_sta *mvmsta;
3516         struct iwl_mvm_vif *mvmvif;
3517
3518         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3519         lq_cmd->agg_time_limit =
3520                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3521
3522 #ifdef CONFIG_MAC80211_DEBUGFS
3523         if (lq_sta->pers.dbg_fixed_rate) {
3524                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3525                                                 lq_sta->band,
3526                                                 lq_sta->pers.dbg_fixed_rate);
3527                 return;
3528         }
3529 #endif
3530         if (WARN_ON_ONCE(!sta || !initial_rate))
3531                 return;
3532
3533         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3534
3535         if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3536                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3537
3538         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3539         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3540
3541         if (num_of_ant(initial_rate->ant) == 1)
3542                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3543
3544         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3545
3546         /*
3547          * In case of low latency, tell the firmware to leave a frame in the
3548          * Tx Fifo so that it can start a transaction in the same TxOP. This
3549          * basically allows the firmware to send bursts.
3550          */
3551         if (iwl_mvm_vif_low_latency(mvmvif))
3552                 lq_cmd->agg_frame_cnt_limit--;
3553
3554         if (mvmsta->vif->p2p)
3555                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3556
3557         lq_cmd->agg_time_limit =
3558                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3559 }
3560
3561 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3562 {
3563         return hw->priv;
3564 }
3565
3566 /* rate scale requires free function to be implemented */
3567 static void rs_free(void *mvm_rate)
3568 {
3569         return;
3570 }
3571
3572 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
3573 {
3574         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3575         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3576
3577         IWL_DEBUG_RATE(mvm, "enter\n");
3578         IWL_DEBUG_RATE(mvm, "leave\n");
3579 }
3580
3581 #ifdef CONFIG_MAC80211_DEBUGFS
3582 int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate)
3583 {
3584
3585         char *type, *bw;
3586         u8 mcs = 0, nss = 0;
3587         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3588
3589         if (!(rate & RATE_MCS_HT_MSK) &&
3590             !(rate & RATE_MCS_VHT_MSK)) {
3591                 int index = iwl_hwrate_to_plcp_idx(rate);
3592
3593                 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps\n",
3594                                  rs_pretty_ant(ant),
3595                                  index == IWL_RATE_INVALID ? "BAD" :
3596                                  iwl_rate_mcs[index].mbps);
3597         }
3598
3599         if (rate & RATE_MCS_VHT_MSK) {
3600                 type = "VHT";
3601                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3602                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3603                        >> RATE_VHT_MCS_NSS_POS) + 1;
3604         } else if (rate & RATE_MCS_HT_MSK) {
3605                 type = "HT";
3606                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3607                 nss = ((rate & RATE_HT_MCS_NSS_MSK)
3608                        >> RATE_HT_MCS_NSS_POS) + 1;
3609         } else {
3610                 type = "Unknown"; /* shouldn't happen */
3611         }
3612
3613         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3614         case RATE_MCS_CHAN_WIDTH_20:
3615                 bw = "20Mhz";
3616                 break;
3617         case RATE_MCS_CHAN_WIDTH_40:
3618                 bw = "40Mhz";
3619                 break;
3620         case RATE_MCS_CHAN_WIDTH_80:
3621                 bw = "80Mhz";
3622                 break;
3623         case RATE_MCS_CHAN_WIDTH_160:
3624                 bw = "160Mhz";
3625                 break;
3626         default:
3627                 bw = "BAD BW";
3628         }
3629
3630         return scnprintf(buf, bufsz,
3631                          "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n",
3632                          type, rs_pretty_ant(ant), bw, mcs, nss,
3633                          (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3634                          (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3635                          (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3636                          (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3637 }
3638
3639 /**
3640  * Program the device to use fixed rate for frame transmit
3641  * This is for debugging/testing only
3642  * once the device start use fixed rate, we need to reload the module
3643  * to being back the normal operation.
3644  */
3645 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3646                                 struct iwl_lq_sta *lq_sta)
3647 {
3648         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3649         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3650         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3651
3652         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3653                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3654
3655         if (lq_sta->pers.dbg_fixed_rate) {
3656                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3657                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3658         }
3659 }
3660
3661 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3662                         const char __user *user_buf, size_t count, loff_t *ppos)
3663 {
3664         struct iwl_lq_sta *lq_sta = file->private_data;
3665         struct iwl_mvm *mvm;
3666         char buf[64];
3667         size_t buf_size;
3668         u32 parsed_rate;
3669
3670         mvm = lq_sta->pers.drv;
3671         memset(buf, 0, sizeof(buf));
3672         buf_size = min(count, sizeof(buf) -  1);
3673         if (copy_from_user(buf, user_buf, buf_size))
3674                 return -EFAULT;
3675
3676         if (sscanf(buf, "%x", &parsed_rate) == 1)
3677                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3678         else
3679                 lq_sta->pers.dbg_fixed_rate = 0;
3680
3681         rs_program_fix_rate(mvm, lq_sta);
3682
3683         return count;
3684 }
3685
3686 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3687                         char __user *user_buf, size_t count, loff_t *ppos)
3688 {
3689         char *buff;
3690         int desc = 0;
3691         int i = 0;
3692         ssize_t ret;
3693         static const size_t bufsz = 2048;
3694
3695         struct iwl_lq_sta *lq_sta = file->private_data;
3696         struct iwl_mvm_sta *mvmsta =
3697                 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
3698         struct iwl_mvm *mvm;
3699         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3700         struct rs_rate *rate = &tbl->rate;
3701         u32 ss_params;
3702
3703         mvm = lq_sta->pers.drv;
3704         buff = kmalloc(bufsz, GFP_KERNEL);
3705         if (!buff)
3706                 return -ENOMEM;
3707
3708         desc += scnprintf(buff + desc, bufsz - desc,
3709                           "sta_id %d\n", lq_sta->lq.sta_id);
3710         desc += scnprintf(buff + desc, bufsz - desc,
3711                           "failed=%d success=%d rate=0%lX\n",
3712                           lq_sta->total_failed, lq_sta->total_success,
3713                           lq_sta->active_legacy_rate);
3714         desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
3715                           lq_sta->pers.dbg_fixed_rate);
3716         desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n",
3717             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3718             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3719             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3720         desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
3721                           (is_legacy(rate)) ? "legacy" :
3722                           is_vht(rate) ? "VHT" : "HT");
3723         if (!is_legacy(rate)) {
3724                 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3725                    (is_siso(rate)) ? "SISO" : "MIMO2");
3726                 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3727                                 (is_ht20(rate)) ? "20MHz" :
3728                                 (is_ht40(rate)) ? "40MHz" :
3729                                 (is_ht80(rate)) ? "80MHz" :
3730                                 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3731                 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
3732                                 (rate->sgi) ? "SGI" : "NGI",
3733                                 (rate->ldpc) ? "LDPC" : "BCC",
3734                                 (lq_sta->is_agg) ? "AGG on" : "",
3735                                 (mvmsta->tlc_amsdu) ? "AMSDU on" : "");
3736         }
3737         desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
3738                         lq_sta->last_rate_n_flags);
3739         desc += scnprintf(buff + desc, bufsz - desc,
3740                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3741                         lq_sta->lq.flags,
3742                         lq_sta->lq.mimo_delim,
3743                         lq_sta->lq.single_stream_ant_msk,
3744                         lq_sta->lq.dual_stream_ant_msk);
3745
3746         desc += scnprintf(buff + desc, bufsz - desc,
3747                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3748                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3749                         lq_sta->lq.agg_disable_start_th,
3750                         lq_sta->lq.agg_frame_cnt_limit);
3751
3752         desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
3753                           lq_sta->lq.reduced_tpc);
3754         ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3755         desc += scnprintf(buff + desc, bufsz - desc,
3756                         "single stream params: %s%s%s%s\n",
3757                         (ss_params & LQ_SS_PARAMS_VALID) ?
3758                         "VALID" : "INVALID",
3759                         (ss_params & LQ_SS_BFER_ALLOWED) ?
3760                         ", BFER" : "",
3761                         (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3762                         ", STBC" : "",
3763                         (ss_params & LQ_SS_FORCE) ?
3764                         ", FORCE" : "");
3765         desc += scnprintf(buff + desc, bufsz - desc,
3766                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3767                         lq_sta->lq.initial_rate_index[0],
3768                         lq_sta->lq.initial_rate_index[1],
3769                         lq_sta->lq.initial_rate_index[2],
3770                         lq_sta->lq.initial_rate_index[3]);
3771
3772         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3773                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3774
3775                 desc += scnprintf(buff + desc, bufsz - desc,
3776                                   " rate[%d] 0x%X ", i, r);
3777                 desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r);
3778         }
3779
3780         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3781         kfree(buff);
3782         return ret;
3783 }
3784
3785 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3786         .write = rs_sta_dbgfs_scale_table_write,
3787         .read = rs_sta_dbgfs_scale_table_read,
3788         .open = simple_open,
3789         .llseek = default_llseek,
3790 };
3791 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3792                         char __user *user_buf, size_t count, loff_t *ppos)
3793 {
3794         char *buff;
3795         int desc = 0;
3796         int i, j;
3797         ssize_t ret;
3798         struct iwl_scale_tbl_info *tbl;
3799         struct rs_rate *rate;
3800         struct iwl_lq_sta *lq_sta = file->private_data;
3801
3802         buff = kmalloc(1024, GFP_KERNEL);
3803         if (!buff)
3804                 return -ENOMEM;
3805
3806         for (i = 0; i < LQ_SIZE; i++) {
3807                 tbl = &(lq_sta->lq_info[i]);
3808                 rate = &tbl->rate;
3809                 desc += sprintf(buff+desc,
3810                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3811                                 "index=%d\n",
3812                                 lq_sta->active_tbl == i ? "*" : "x",
3813                                 rate->type,
3814                                 rate->sgi,
3815                                 is_ht20(rate) ? "20MHz" :
3816                                 is_ht40(rate) ? "40MHz" :
3817                                 is_ht80(rate) ? "80MHz" :
3818                                 is_ht160(rate) ? "160MHz" : "ERR",
3819                                 rate->index);
3820                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3821                         desc += sprintf(buff+desc,
3822                                 "counter=%d success=%d %%=%d\n",
3823                                 tbl->win[j].counter,
3824                                 tbl->win[j].success_counter,
3825                                 tbl->win[j].success_ratio);
3826                 }
3827         }
3828         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3829         kfree(buff);
3830         return ret;
3831 }
3832
3833 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3834         .read = rs_sta_dbgfs_stats_table_read,
3835         .open = simple_open,
3836         .llseek = default_llseek,
3837 };
3838
3839 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3840                                               char __user *user_buf,
3841                                               size_t count, loff_t *ppos)
3842 {
3843         static const char * const column_name[] = {
3844                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3845                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3846                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3847                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3848                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3849                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3850                 [RS_COLUMN_MIMO2] = "MIMO2",
3851                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3852         };
3853
3854         static const char * const rate_name[] = {
3855                 [IWL_RATE_1M_INDEX] = "1M",
3856                 [IWL_RATE_2M_INDEX] = "2M",
3857                 [IWL_RATE_5M_INDEX] = "5.5M",
3858                 [IWL_RATE_11M_INDEX] = "11M",
3859                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3860                 [IWL_RATE_9M_INDEX] = "9M",
3861                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3862                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3863                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3864                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3865                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3866                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3867                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3868                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3869                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3870         };
3871
3872         char *buff, *pos, *endpos;
3873         int col, rate;
3874         ssize_t ret;
3875         struct iwl_lq_sta *lq_sta = file->private_data;
3876         struct rs_rate_stats *stats;
3877         static const size_t bufsz = 1024;
3878
3879         buff = kmalloc(bufsz, GFP_KERNEL);
3880         if (!buff)
3881                 return -ENOMEM;
3882
3883         pos = buff;
3884         endpos = pos + bufsz;
3885
3886         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3887         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3888                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3889         pos += scnprintf(pos, endpos - pos, "\n");
3890
3891         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3892                 pos += scnprintf(pos, endpos - pos,
3893                                  "%s,", column_name[col]);
3894
3895                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3896                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3897                         pos += scnprintf(pos, endpos - pos,
3898                                          "%llu/%llu,",
3899                                          stats->success,
3900                                          stats->total);
3901                 }
3902                 pos += scnprintf(pos, endpos - pos, "\n");
3903         }
3904
3905         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3906         kfree(buff);
3907         return ret;
3908 }
3909
3910 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3911                                                const char __user *user_buf,
3912                                                size_t count, loff_t *ppos)
3913 {
3914         struct iwl_lq_sta *lq_sta = file->private_data;
3915         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3916
3917         return count;
3918 }
3919
3920 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3921         .read = rs_sta_dbgfs_drv_tx_stats_read,
3922         .write = rs_sta_dbgfs_drv_tx_stats_write,
3923         .open = simple_open,
3924         .llseek = default_llseek,
3925 };
3926
3927 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3928                                        char __user *user_buf,
3929                                        size_t count, loff_t *ppos)
3930 {
3931         struct iwl_lq_sta *lq_sta = file->private_data;
3932         char buf[12];
3933         int bufsz = sizeof(buf);
3934         int pos = 0;
3935         static const char * const ss_force_name[] = {
3936                 [RS_SS_FORCE_NONE] = "none",
3937                 [RS_SS_FORCE_STBC] = "stbc",
3938                 [RS_SS_FORCE_BFER] = "bfer",
3939                 [RS_SS_FORCE_SISO] = "siso",
3940         };
3941
3942         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3943                          ss_force_name[lq_sta->pers.ss_force]);
3944         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3945 }
3946
3947 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3948                                         size_t count, loff_t *ppos)
3949 {
3950         struct iwl_mvm *mvm = lq_sta->pers.drv;
3951         int ret = 0;
3952
3953         if (!strncmp("none", buf, 4)) {
3954                 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3955         } else if (!strncmp("siso", buf, 4)) {
3956                 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3957         } else if (!strncmp("stbc", buf, 4)) {
3958                 if (lq_sta->stbc_capable) {
3959                         lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3960                 } else {
3961                         IWL_ERR(mvm,
3962                                 "can't force STBC. peer doesn't support\n");
3963                         ret = -EINVAL;
3964                 }
3965         } else if (!strncmp("bfer", buf, 4)) {
3966                 if (lq_sta->bfer_capable) {
3967                         lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3968                 } else {
3969                         IWL_ERR(mvm,
3970                                 "can't force BFER. peer doesn't support\n");
3971                         ret = -EINVAL;
3972                 }
3973         } else {
3974                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3975                 ret = -EINVAL;
3976         }
3977         return ret ?: count;
3978 }
3979
3980 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3981         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3982 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
3983                 if (!debugfs_create_file(#name, mode, parent, lq_sta,   \
3984                                          &iwl_dbgfs_##name##_ops))      \
3985                         goto err;                                       \
3986         } while (0)
3987
3988 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3989
3990 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
3991                                    struct dentry *dir)
3992 {
3993         struct iwl_lq_sta *lq_sta = priv_sta;
3994         struct iwl_mvm_sta *mvmsta;
3995
3996         mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
3997
3998         if (!mvmsta->vif)
3999                 return;
4000
4001         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
4002                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
4003         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
4004                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
4005         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
4006                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4007         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
4008                           &lq_sta->tx_agg_tid_en);
4009         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
4010                           &lq_sta->pers.dbg_fixed_txp_reduction);
4011
4012         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
4013         return;
4014 err:
4015         IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
4016 }
4017
4018 void rs_remove_sta_debugfs(void *mvm, void *mvm_sta)
4019 {
4020 }
4021 #endif
4022
4023 /*
4024  * Initialization of rate scaling information is done by driver after
4025  * the station is added. Since mac80211 calls this function before a
4026  * station is added we ignore it.
4027  */
4028 static void rs_rate_init_ops(void *mvm_r,
4029                              struct ieee80211_supported_band *sband,
4030                              struct cfg80211_chan_def *chandef,
4031                              struct ieee80211_sta *sta, void *mvm_sta)
4032 {
4033 }
4034
4035 /* ops for rate scaling implemented in the driver */
4036 static const struct rate_control_ops rs_mvm_ops_drv = {
4037         .name = RS_NAME,
4038         .tx_status = rs_drv_mac80211_tx_status,
4039         .get_rate = rs_drv_get_rate,
4040         .rate_init = rs_rate_init_ops,
4041         .alloc = rs_alloc,
4042         .free = rs_free,
4043         .alloc_sta = rs_drv_alloc_sta,
4044         .free_sta = rs_free_sta,
4045         .rate_update = rs_drv_rate_update,
4046 #ifdef CONFIG_MAC80211_DEBUGFS
4047         .add_sta_debugfs = rs_drv_add_sta_debugfs,
4048         .remove_sta_debugfs = rs_remove_sta_debugfs,
4049 #endif
4050 };
4051
4052 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
4053                           enum nl80211_band band, bool init)
4054 {
4055         if (iwl_mvm_has_tlc_offload(mvm))
4056                 rs_fw_rate_init(mvm, sta, band);
4057         else
4058                 rs_drv_rate_init(mvm, sta, band, init);
4059 }
4060
4061 int iwl_mvm_rate_control_register(void)
4062 {
4063         return ieee80211_rate_control_register(&rs_mvm_ops_drv);
4064 }
4065
4066 void iwl_mvm_rate_control_unregister(void)
4067 {
4068         ieee80211_rate_control_unregister(&rs_mvm_ops_drv);
4069 }
4070
4071 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4072                                 bool enable)
4073 {
4074         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq;
4075
4076         lockdep_assert_held(&mvm->mutex);
4077
4078         if (enable) {
4079                 if (mvmsta->tx_protection == 0)
4080                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
4081                 mvmsta->tx_protection++;
4082         } else {
4083                 mvmsta->tx_protection--;
4084                 if (mvmsta->tx_protection == 0)
4085                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4086         }
4087
4088         return iwl_mvm_send_lq_cmd(mvm, lq, false);
4089 }
4090
4091 /**
4092  * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection
4093  * @mvmsta: The station
4094  * @enable: Enable Tx protection?
4095  */
4096 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4097                           bool enable)
4098 {
4099         if (iwl_mvm_has_tlc_offload(mvm))
4100                 return rs_fw_tx_protection(mvm, mvmsta, enable);
4101         else
4102                 return rs_drv_tx_protection(mvm, mvmsta, enable);
4103 }