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 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 RS_NAME "iwl-mvm-rs"
  46
  47 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  48
  49 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
  50  * Use this macro when dealing with thresholds consts set as a percentage
  51  */
  52 #define RS_PERCENT(x) (128 * x)
  53
  54 static u8 rs_ht_to_legacy[] = {
  55         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  56         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  57         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  58         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  59         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  60         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  61         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  62         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  63         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  64         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  65 };
  66
  67 static const u8 ant_toggle_lookup[] = {
  68         [ANT_NONE] = ANT_NONE,
  69         [ANT_A] = ANT_B,
  70         [ANT_B] = ANT_C,
  71         [ANT_AB] = ANT_BC,
  72         [ANT_C] = ANT_A,
  73         [ANT_AC] = ANT_AB,
  74         [ANT_BC] = ANT_AC,
  75         [ANT_ABC] = ANT_ABC,
  76 };
  77
  78 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  79         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  80                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  81                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  82                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  83                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  84                                     IWL_RATE_##rp##M_INDEX,           \
  85                                     IWL_RATE_##rn##M_INDEX }
  86
  87 #define IWL_DECLARE_MCS_RATE(s)                                           \
  88         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
  89                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
  90                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
  91                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
  92                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
  93                                        IWL_RATE_INVM_INDEX,               \
  94                                        IWL_RATE_INVM_INDEX }
  95
  96 /*
  97  * Parameter order:
  98  *   rate, ht rate, prev rate, next rate
  99  *
 100  * If there isn't a valid next or previous rate then INV is used which
 101  * maps to IWL_RATE_INVALID
 102  *
 103  */
 104 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 105         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 106         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 107         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 108         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 109         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 110         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 111         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 112         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 113         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 114         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 115         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 116         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 117         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 118         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 119         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 120 };
 121
 122 enum rs_action {
 123         RS_ACTION_STAY = 0,
 124         RS_ACTION_DOWNSCALE = -1,
 125         RS_ACTION_UPSCALE = 1,
 126 };
 127
 128 enum rs_column_mode {
 129         RS_INVALID = 0,
 130         RS_LEGACY,
 131         RS_SISO,
 132         RS_MIMO2,
 133 };
 134
 135 #define MAX_NEXT_COLUMNS 7
 136 #define MAX_COLUMN_CHECKS 3
 137
 138 struct rs_tx_column;
 139
 140 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 141                                      struct ieee80211_sta *sta,
 142                                      struct rs_rate *rate,
 143                                      const struct rs_tx_column *next_col);
 144
 145 struct rs_tx_column {
 146         enum rs_column_mode mode;
 147         u8 ant;
 148         bool sgi;
 149         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 150         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 151 };
 152
 153 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 154                          struct rs_rate *rate,
 155                          const struct rs_tx_column *next_col)
 156 {
 157         return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
 158 }
 159
 160 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 161                           struct rs_rate *rate,
 162                           const struct rs_tx_column *next_col)
 163 {
 164         struct iwl_mvm_sta *mvmsta;
 165         struct iwl_mvm_vif *mvmvif;
 166
 167         if (!sta->ht_cap.ht_supported)
 168                 return false;
 169
 170         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 171                 return false;
 172
 173         if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
 174                 return false;
 175
 176         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 177                 return false;
 178
 179         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 180         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 181
 182         if (mvm->nvm_data->sku_cap_mimo_disabled)
 183                 return false;
 184
 185         return true;
 186 }
 187
 188 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 189                           struct rs_rate *rate,
 190                           const struct rs_tx_column *next_col)
 191 {
 192         if (!sta->ht_cap.ht_supported)
 193                 return false;
 194
 195         return true;
 196 }
 197
 198 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 199                          struct rs_rate *rate,
 200                          const struct rs_tx_column *next_col)
 201 {
 202         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 203         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 204
 205         if (is_ht20(rate) && (ht_cap->cap &
 206                              IEEE80211_HT_CAP_SGI_20))
 207                 return true;
 208         if (is_ht40(rate) && (ht_cap->cap &
 209                              IEEE80211_HT_CAP_SGI_40))
 210                 return true;
 211         if (is_ht80(rate) && (vht_cap->cap &
 212                              IEEE80211_VHT_CAP_SHORT_GI_80))
 213                 return true;
 214         if (is_ht160(rate) && (vht_cap->cap &
 215                              IEEE80211_VHT_CAP_SHORT_GI_160))
 216                 return true;
 217
 218         return false;
 219 }
 220
 221 static const struct rs_tx_column rs_tx_columns[] = {
 222         [RS_COLUMN_LEGACY_ANT_A] = {
 223                 .mode = RS_LEGACY,
 224                 .ant = ANT_A,
 225                 .next_columns = {
 226                         RS_COLUMN_LEGACY_ANT_B,
 227                         RS_COLUMN_SISO_ANT_A,
 228                         RS_COLUMN_MIMO2,
 229                         RS_COLUMN_INVALID,
 230                         RS_COLUMN_INVALID,
 231                         RS_COLUMN_INVALID,
 232                         RS_COLUMN_INVALID,
 233                 },
 234                 .checks = {
 235                         rs_ant_allow,
 236                 },
 237         },
 238         [RS_COLUMN_LEGACY_ANT_B] = {
 239                 .mode = RS_LEGACY,
 240                 .ant = ANT_B,
 241                 .next_columns = {
 242                         RS_COLUMN_LEGACY_ANT_A,
 243                         RS_COLUMN_SISO_ANT_B,
 244                         RS_COLUMN_MIMO2,
 245                         RS_COLUMN_INVALID,
 246                         RS_COLUMN_INVALID,
 247                         RS_COLUMN_INVALID,
 248                         RS_COLUMN_INVALID,
 249                 },
 250                 .checks = {
 251                         rs_ant_allow,
 252                 },
 253         },
 254         [RS_COLUMN_SISO_ANT_A] = {
 255                 .mode = RS_SISO,
 256                 .ant = ANT_A,
 257                 .next_columns = {
 258                         RS_COLUMN_SISO_ANT_B,
 259                         RS_COLUMN_MIMO2,
 260                         RS_COLUMN_SISO_ANT_A_SGI,
 261                         RS_COLUMN_LEGACY_ANT_A,
 262                         RS_COLUMN_LEGACY_ANT_B,
 263                         RS_COLUMN_INVALID,
 264                         RS_COLUMN_INVALID,
 265                 },
 266                 .checks = {
 267                         rs_siso_allow,
 268                         rs_ant_allow,
 269                 },
 270         },
 271         [RS_COLUMN_SISO_ANT_B] = {
 272                 .mode = RS_SISO,
 273                 .ant = ANT_B,
 274                 .next_columns = {
 275                         RS_COLUMN_SISO_ANT_A,
 276                         RS_COLUMN_MIMO2,
 277                         RS_COLUMN_SISO_ANT_B_SGI,
 278                         RS_COLUMN_LEGACY_ANT_A,
 279                         RS_COLUMN_LEGACY_ANT_B,
 280                         RS_COLUMN_INVALID,
 281                         RS_COLUMN_INVALID,
 282                 },
 283                 .checks = {
 284                         rs_siso_allow,
 285                         rs_ant_allow,
 286                 },
 287         },
 288         [RS_COLUMN_SISO_ANT_A_SGI] = {
 289                 .mode = RS_SISO,
 290                 .ant = ANT_A,
 291                 .sgi = true,
 292                 .next_columns = {
 293                         RS_COLUMN_SISO_ANT_B_SGI,
 294                         RS_COLUMN_MIMO2_SGI,
 295                         RS_COLUMN_SISO_ANT_A,
 296                         RS_COLUMN_LEGACY_ANT_A,
 297                         RS_COLUMN_LEGACY_ANT_B,
 298                         RS_COLUMN_INVALID,
 299                         RS_COLUMN_INVALID,
 300                 },
 301                 .checks = {
 302                         rs_siso_allow,
 303                         rs_ant_allow,
 304                         rs_sgi_allow,
 305                 },
 306         },
 307         [RS_COLUMN_SISO_ANT_B_SGI] = {
 308                 .mode = RS_SISO,
 309                 .ant = ANT_B,
 310                 .sgi = true,
 311                 .next_columns = {
 312                         RS_COLUMN_SISO_ANT_A_SGI,
 313                         RS_COLUMN_MIMO2_SGI,
 314                         RS_COLUMN_SISO_ANT_B,
 315                         RS_COLUMN_LEGACY_ANT_A,
 316                         RS_COLUMN_LEGACY_ANT_B,
 317                         RS_COLUMN_INVALID,
 318                         RS_COLUMN_INVALID,
 319                 },
 320                 .checks = {
 321                         rs_siso_allow,
 322                         rs_ant_allow,
 323                         rs_sgi_allow,
 324                 },
 325         },
 326         [RS_COLUMN_MIMO2] = {
 327                 .mode = RS_MIMO2,
 328                 .ant = ANT_AB,
 329                 .next_columns = {
 330                         RS_COLUMN_SISO_ANT_A,
 331                         RS_COLUMN_MIMO2_SGI,
 332                         RS_COLUMN_LEGACY_ANT_A,
 333                         RS_COLUMN_LEGACY_ANT_B,
 334                         RS_COLUMN_INVALID,
 335                         RS_COLUMN_INVALID,
 336                         RS_COLUMN_INVALID,
 337                 },
 338                 .checks = {
 339                         rs_mimo_allow,
 340                 },
 341         },
 342         [RS_COLUMN_MIMO2_SGI] = {
 343                 .mode = RS_MIMO2,
 344                 .ant = ANT_AB,
 345                 .sgi = true,
 346                 .next_columns = {
 347                         RS_COLUMN_SISO_ANT_A_SGI,
 348                         RS_COLUMN_MIMO2,
 349                         RS_COLUMN_LEGACY_ANT_A,
 350                         RS_COLUMN_LEGACY_ANT_B,
 351                         RS_COLUMN_INVALID,
 352                         RS_COLUMN_INVALID,
 353                         RS_COLUMN_INVALID,
 354                 },
 355                 .checks = {
 356                         rs_mimo_allow,
 357                         rs_sgi_allow,
 358                 },
 359         },
 360 };
 361
 362 static inline u8 rs_extract_rate(u32 rate_n_flags)
 363 {
 364         /* also works for HT because bits 7:6 are zero there */
 365         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 366 }
 367
 368 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 369 {
 370         int idx = 0;
 371
 372         if (rate_n_flags & RATE_MCS_HT_MSK) {
 373                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 374                 idx += IWL_RATE_MCS_0_INDEX;
 375
 376                 /* skip 9M not supported in HT*/
 377                 if (idx >= IWL_RATE_9M_INDEX)
 378                         idx += 1;
 379                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 380                         return idx;
 381         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 382                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 383                 idx += IWL_RATE_MCS_0_INDEX;
 384
 385                 /* skip 9M not supported in VHT*/
 386                 if (idx >= IWL_RATE_9M_INDEX)
 387                         idx++;
 388                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 389                         return idx;
 390         } else {
 391                 /* legacy rate format, search for match in table */
 392
 393                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 394                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 395                         if (iwl_rates[idx].plcp == legacy_rate)
 396                                 return idx;
 397         }
 398
 399         return IWL_RATE_INVALID;
 400 }
 401
 402 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 403                                   struct ieee80211_sta *sta,
 404                                   struct iwl_lq_sta *lq_sta,
 405                                   int tid, bool ndp);
 406 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 407                            struct ieee80211_sta *sta,
 408                            struct iwl_lq_sta *lq_sta,
 409                            const struct rs_rate *initial_rate);
 410 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 411
 412 /**
 413  * The following tables contain the expected throughput metrics for all rates
 414  *
 415  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 416  *
 417  * where invalid entries are zeros.
 418  *
 419  * CCK rates are only valid in legacy table and will only be used in G
 420  * (2.4 GHz) band.
 421  */
 422
 423 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 424         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 425 };
 426
 427 /* Expected TpT tables. 4 indexes:
 428  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 429  */
 430 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 431         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 432         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 433         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 434         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 435 };
 436
 437 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 438         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 439         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 440         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 441         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 442 };
 443
 444 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 445         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 446         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 447         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 448         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 449 };
 450
 451 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
 452         {0, 0, 0, 0, 191, 0, 244, 288,  298,  308,  313,  318,  323,  328,  330},
 453         {0, 0, 0, 0, 200, 0, 251, 293,  302,  312,  317,  322,  327,  332,  334},
 454         {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
 455         {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
 456 };
 457
 458 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 459         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 460         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 461         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 462         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 463 };
 464
 465 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 466         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 467         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 468         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 469         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 470 };
 471
 472 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 473         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 474         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 475         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 476         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 477 };
 478
 479 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
 480         {0, 0, 0, 0, 240, 0, 278,  308,  313,  319,  322,  324,  328,  330,   334},
 481         {0, 0, 0, 0, 247, 0, 282,  310,  315,  320,  323,  325,  329,  332,   338},
 482         {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629,  10592},
 483         {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
 484 };
 485
 486 /* mbps, mcs */
 487 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 488         {  "1", "BPSK DSSS"},
 489         {  "2", "QPSK DSSS"},
 490         {"5.5", "BPSK CCK"},
 491         { "11", "QPSK CCK"},
 492         {  "6", "BPSK 1/2"},
 493         {  "9", "BPSK 1/2"},
 494         { "12", "QPSK 1/2"},
 495         { "18", "QPSK 3/4"},
 496         { "24", "16QAM 1/2"},
 497         { "36", "16QAM 3/4"},
 498         { "48", "64QAM 2/3"},
 499         { "54", "64QAM 3/4"},
 500         { "60", "64QAM 5/6"},
 501 };
 502
 503 #define MCS_INDEX_PER_STREAM    (8)
 504
 505 static const char *rs_pretty_ant(u8 ant)
 506 {
 507         static const char * const ant_name[] = {
 508                 [ANT_NONE] = "None",
 509                 [ANT_A]    = "A",
 510                 [ANT_B]    = "B",
 511                 [ANT_AB]   = "AB",
 512                 [ANT_C]    = "C",
 513                 [ANT_AC]   = "AC",
 514                 [ANT_BC]   = "BC",
 515                 [ANT_ABC]  = "ABC",
 516         };
 517
 518         if (ant > ANT_ABC)
 519                 return "UNKNOWN";
 520
 521         return ant_name[ant];
 522 }
 523
 524 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 525 {
 526         static const char * const lq_types[] = {
 527                 [LQ_NONE] = "NONE",
 528                 [LQ_LEGACY_A] = "LEGACY_A",
 529                 [LQ_LEGACY_G] = "LEGACY_G",
 530                 [LQ_HT_SISO] = "HT SISO",
 531                 [LQ_HT_MIMO2] = "HT MIMO",
 532                 [LQ_VHT_SISO] = "VHT SISO",
 533                 [LQ_VHT_MIMO2] = "VHT MIMO",
 534         };
 535
 536         if (type < LQ_NONE || type >= LQ_MAX)
 537                 return "UNKNOWN";
 538
 539         return lq_types[type];
 540 }
 541
 542 static char *rs_pretty_rate(const struct rs_rate *rate)
 543 {
 544         static char buf[40];
 545         static const char * const legacy_rates[] = {
 546                 [IWL_RATE_1M_INDEX] = "1M",
 547                 [IWL_RATE_2M_INDEX] = "2M",
 548                 [IWL_RATE_5M_INDEX] = "5.5M",
 549                 [IWL_RATE_11M_INDEX] = "11M",
 550                 [IWL_RATE_6M_INDEX] = "6M",
 551                 [IWL_RATE_9M_INDEX] = "9M",
 552                 [IWL_RATE_12M_INDEX] = "12M",
 553                 [IWL_RATE_18M_INDEX] = "18M",
 554                 [IWL_RATE_24M_INDEX] = "24M",
 555                 [IWL_RATE_36M_INDEX] = "36M",
 556                 [IWL_RATE_48M_INDEX] = "48M",
 557                 [IWL_RATE_54M_INDEX] = "54M",
 558         };
 559         static const char *const ht_vht_rates[] = {
 560                 [IWL_RATE_MCS_0_INDEX] = "MCS0",
 561                 [IWL_RATE_MCS_1_INDEX] = "MCS1",
 562                 [IWL_RATE_MCS_2_INDEX] = "MCS2",
 563                 [IWL_RATE_MCS_3_INDEX] = "MCS3",
 564                 [IWL_RATE_MCS_4_INDEX] = "MCS4",
 565                 [IWL_RATE_MCS_5_INDEX] = "MCS5",
 566                 [IWL_RATE_MCS_6_INDEX] = "MCS6",
 567                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
 568                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
 569                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
 570         };
 571         const char *rate_str;
 572
 573         if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
 574                 rate_str = legacy_rates[rate->index];
 575         else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
 576                  (rate->index >= IWL_RATE_MCS_0_INDEX) &&
 577                  (rate->index <= IWL_RATE_MCS_9_INDEX))
 578                 rate_str = ht_vht_rates[rate->index];
 579         else
 580                 rate_str = "BAD_RATE";
 581
 582         sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
 583                 rs_pretty_ant(rate->ant), rate_str);
 584         return buf;
 585 }
 586
 587 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 588                                 const char *prefix)
 589 {
 590         IWL_DEBUG_RATE(mvm,
 591                        "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
 592                        prefix, rs_pretty_rate(rate), rate->bw,
 593                        rate->sgi, rate->ldpc, rate->stbc);
 594 }
 595
 596 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 597 {
 598         window->data = 0;
 599         window->success_counter = 0;
 600         window->success_ratio = IWL_INVALID_VALUE;
 601         window->counter = 0;
 602         window->average_tpt = IWL_INVALID_VALUE;
 603 }
 604
 605 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 606                                             struct iwl_scale_tbl_info *tbl)
 607 {
 608         int i;
 609
 610         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 611         for (i = 0; i < IWL_RATE_COUNT; i++)
 612                 rs_rate_scale_clear_window(&tbl->win[i]);
 613
 614         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 615                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 616 }
 617
 618 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 619 {
 620         return (ant_type & valid_antenna) == ant_type;
 621 }
 622
 623 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 624                                      struct iwl_lq_sta *lq_data, u8 tid,
 625                                      struct ieee80211_sta *sta)
 626 {
 627         int ret = -EAGAIN;
 628
 629         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 630                      sta->addr, tid);
 631         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 632         if (ret == -EAGAIN) {
 633                 /*
 634                  * driver and mac80211 is out of sync
 635                  * this might be cause by reloading firmware
 636                  * stop the tx ba session here
 637                  */
 638                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 639                         tid);
 640                 ieee80211_stop_tx_ba_session(sta, tid);
 641         }
 642         return ret;
 643 }
 644
 645 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 646                               struct iwl_lq_sta *lq_data,
 647                               struct ieee80211_sta *sta)
 648 {
 649         if (tid < IWL_MAX_TID_COUNT)
 650                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 651         else
 652                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 653                         tid, IWL_MAX_TID_COUNT);
 654 }
 655
 656 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 657 {
 658         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 659                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 660                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 661 }
 662
 663 /*
 664  * Static function to get the expected throughput from an iwl_scale_tbl_info
 665  * that wraps a NULL pointer check
 666  */
 667 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 668 {
 669         if (tbl->expected_tpt)
 670                 return tbl->expected_tpt[rs_index];
 671         return 0;
 672 }
 673
 674 /**
 675  * rs_collect_tx_data - Update the success/failure sliding window
 676  *
 677  * We keep a sliding window of the last 62 packets transmitted
 678  * at this rate.  window->data contains the bitmask of successful
 679  * packets.
 680  */
 681 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
 682                                struct iwl_scale_tbl_info *tbl,
 683                                int scale_index, int attempts, int successes,
 684                                struct iwl_rate_scale_data *window)
 685 {
 686         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 687         s32 fail_count, tpt;
 688
 689         /* Get expected throughput */
 690         tpt = get_expected_tpt(tbl, scale_index);
 691
 692         /*
 693          * Keep track of only the latest 62 tx frame attempts in this rate's
 694          * history window; anything older isn't really relevant any more.
 695          * If we have filled up the sliding window, drop the oldest attempt;
 696          * if the oldest attempt (highest bit in bitmap) shows "success",
 697          * subtract "1" from the success counter (this is the main reason
 698          * we keep these bitmaps!).
 699          */
 700         while (attempts > 0) {
 701                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 702                         /* remove earliest */
 703                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 704
 705                         if (window->data & mask) {
 706                                 window->data &= ~mask;
 707                                 window->success_counter--;
 708                         }
 709                 }
 710
 711                 /* Increment frames-attempted counter */
 712                 window->counter++;
 713
 714                 /* Shift bitmap by one frame to throw away oldest history */
 715                 window->data <<= 1;
 716
 717                 /* Mark the most recent #successes attempts as successful */
 718                 if (successes > 0) {
 719                         window->success_counter++;
 720                         window->data |= 0x1;
 721                         successes--;
 722                 }
 723
 724                 attempts--;
 725         }
 726
 727         /* Calculate current success ratio, avoid divide-by-0! */
 728         if (window->counter > 0)
 729                 window->success_ratio = 128 * (100 * window->success_counter)
 730                                         / window->counter;
 731         else
 732                 window->success_ratio = IWL_INVALID_VALUE;
 733
 734         fail_count = window->counter - window->success_counter;
 735
 736         /* Calculate average throughput, if we have enough history. */
 737         if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
 738             (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
 739                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 740         else
 741                 window->average_tpt = IWL_INVALID_VALUE;
 742
 743         return 0;
 744 }
 745
 746 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
 747                                struct iwl_lq_sta *lq_sta,
 748                                struct iwl_scale_tbl_info *tbl,
 749                                int scale_index, int attempts, int successes,
 750                                u8 reduced_txp)
 751 {
 752         struct iwl_rate_scale_data *window = NULL;
 753
 754         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 755                 return -EINVAL;
 756
 757         window = &tbl->tpc_win[reduced_txp];
 758         return  _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 759                                     window);
 760 }
 761
 762 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
 763                                struct iwl_lq_sta *lq_sta,
 764                                struct iwl_scale_tbl_info *tbl,
 765                                int scale_index, int attempts, int successes)
 766 {
 767         struct iwl_rate_scale_data *window = NULL;
 768
 769         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 770                 return -EINVAL;
 771
 772         if (tbl->column != RS_COLUMN_INVALID) {
 773                 struct lq_sta_pers *pers = &lq_sta->pers;
 774
 775                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 776                 pers->tx_stats[tbl->column][scale_index].success += successes;
 777         }
 778
 779         /* Select window for current tx bit rate */
 780         window = &(tbl->win[scale_index]);
 781         return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 782                                    window);
 783 }
 784
 785 /* Convert rs_rate object into ucode rate bitmask */
 786 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 787                                   struct rs_rate *rate)
 788 {
 789         u32 ucode_rate = 0;
 790         int index = rate->index;
 791
 792         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 793                          RATE_MCS_ANT_ABC_MSK);
 794
 795         if (is_legacy(rate)) {
 796                 ucode_rate |= iwl_rates[index].plcp;
 797                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 798                         ucode_rate |= RATE_MCS_CCK_MSK;
 799                 return ucode_rate;
 800         }
 801
 802         if (is_ht(rate)) {
 803                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 804                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 805                         index = IWL_LAST_HT_RATE;
 806                 }
 807                 ucode_rate |= RATE_MCS_HT_MSK;
 808
 809                 if (is_ht_siso(rate))
 810                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 811                 else if (is_ht_mimo2(rate))
 812                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 813                 else
 814                         WARN_ON_ONCE(1);
 815         } else if (is_vht(rate)) {
 816                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 817                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 818                         index = IWL_LAST_VHT_RATE;
 819                 }
 820                 ucode_rate |= RATE_MCS_VHT_MSK;
 821                 if (is_vht_siso(rate))
 822                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 823                 else if (is_vht_mimo2(rate))
 824                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 825                 else
 826                         WARN_ON_ONCE(1);
 827
 828         } else {
 829                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 830         }
 831
 832         if (is_siso(rate) && rate->stbc) {
 833                 /* To enable STBC we need to set both a flag and ANT_AB */
 834                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 835                 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
 836         }
 837
 838         ucode_rate |= rate->bw;
 839         if (rate->sgi)
 840                 ucode_rate |= RATE_MCS_SGI_MSK;
 841         if (rate->ldpc)
 842                 ucode_rate |= RATE_MCS_LDPC_MSK;
 843
 844         return ucode_rate;
 845 }
 846
 847 /* Convert a ucode rate into an rs_rate object */
 848 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 849                                    enum nl80211_band band,
 850                                    struct rs_rate *rate)
 851 {
 852         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 853         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 854         u8 nss;
 855
 856         memset(rate, 0, sizeof(*rate));
 857         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 858
 859         if (rate->index == IWL_RATE_INVALID)
 860                 return -EINVAL;
 861
 862         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 863
 864         /* Legacy */
 865         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 866             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 867                 if (num_of_ant == 1) {
 868                         if (band == NL80211_BAND_5GHZ)
 869                                 rate->type = LQ_LEGACY_A;
 870                         else
 871                                 rate->type = LQ_LEGACY_G;
 872                 }
 873
 874                 return 0;
 875         }
 876
 877         /* HT or VHT */
 878         if (ucode_rate & RATE_MCS_SGI_MSK)
 879                 rate->sgi = true;
 880         if (ucode_rate & RATE_MCS_LDPC_MSK)
 881                 rate->ldpc = true;
 882         if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
 883                 rate->stbc = true;
 884         if (ucode_rate & RATE_MCS_BF_MSK)
 885                 rate->bfer = true;
 886
 887         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 888
 889         if (ucode_rate & RATE_MCS_HT_MSK) {
 890                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 891                        RATE_HT_MCS_NSS_POS) + 1;
 892
 893                 if (nss == 1) {
 894                         rate->type = LQ_HT_SISO;
 895                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 896                                   "stbc %d bfer %d",
 897                                   rate->stbc, rate->bfer);
 898                 } else if (nss == 2) {
 899                         rate->type = LQ_HT_MIMO2;
 900                         WARN_ON_ONCE(num_of_ant != 2);
 901                 } else {
 902                         WARN_ON_ONCE(1);
 903                 }
 904         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 905                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 906                        RATE_VHT_MCS_NSS_POS) + 1;
 907
 908                 if (nss == 1) {
 909                         rate->type = LQ_VHT_SISO;
 910                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 911                                   "stbc %d bfer %d",
 912                                   rate->stbc, rate->bfer);
 913                 } else if (nss == 2) {
 914                         rate->type = LQ_VHT_MIMO2;
 915                         WARN_ON_ONCE(num_of_ant != 2);
 916                 } else {
 917                         WARN_ON_ONCE(1);
 918                 }
 919         }
 920
 921         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 922                      !is_vht(rate));
 923
 924         return 0;
 925 }
 926
 927 /* switch to another antenna/antennas and return 1 */
 928 /* if no other valid antenna found, return 0 */
 929 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 930 {
 931         u8 new_ant_type;
 932
 933         if (!rate->ant || rate->ant > ANT_ABC)
 934                 return 0;
 935
 936         if (!rs_is_valid_ant(valid_ant, rate->ant))
 937                 return 0;
 938
 939         new_ant_type = ant_toggle_lookup[rate->ant];
 940
 941         while ((new_ant_type != rate->ant) &&
 942                !rs_is_valid_ant(valid_ant, new_ant_type))
 943                 new_ant_type = ant_toggle_lookup[new_ant_type];
 944
 945         if (new_ant_type == rate->ant)
 946                 return 0;
 947
 948         rate->ant = new_ant_type;
 949
 950         return 1;
 951 }
 952
 953 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 954                                   struct rs_rate *rate)
 955 {
 956         if (is_legacy(rate))
 957                 return lq_sta->active_legacy_rate;
 958         else if (is_siso(rate))
 959                 return lq_sta->active_siso_rate;
 960         else if (is_mimo2(rate))
 961                 return lq_sta->active_mimo2_rate;
 962
 963         WARN_ON_ONCE(1);
 964         return 0;
 965 }
 966
 967 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 968                                 int rate_type)
 969 {
 970         u8 high = IWL_RATE_INVALID;
 971         u8 low = IWL_RATE_INVALID;
 972
 973         /* 802.11A or ht walks to the next literal adjacent rate in
 974          * the rate table */
 975         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 976                 int i;
 977                 u32 mask;
 978
 979                 /* Find the previous rate that is in the rate mask */
 980                 i = index - 1;
 981                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 982                         if (rate_mask & mask) {
 983                                 low = i;
 984                                 break;
 985                         }
 986                 }
 987
 988                 /* Find the next rate that is in the rate mask */
 989                 i = index + 1;
 990                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 991                         if (rate_mask & mask) {
 992                                 high = i;
 993                                 break;
 994                         }
 995                 }
 996
 997                 return (high << 8) | low;
 998         }
 999
1000         low = index;
1001         while (low != IWL_RATE_INVALID) {
1002                 low = iwl_rates[low].prev_rs;
1003                 if (low == IWL_RATE_INVALID)
1004                         break;
1005                 if (rate_mask & (1 << low))
1006                         break;
1007         }
1008
1009         high = index;
1010         while (high != IWL_RATE_INVALID) {
1011                 high = iwl_rates[high].next_rs;
1012                 if (high == IWL_RATE_INVALID)
1013                         break;
1014                 if (rate_mask & (1 << high))
1015                         break;
1016         }
1017
1018         return (high << 8) | low;
1019 }
1020
1021 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1022                                      struct rs_rate *rate)
1023 {
1024         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1025 }
1026
1027 /* Get the next supported lower rate in the current column.
1028  * Return true if bottom rate in the current column was reached
1029  */
1030 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1031                                         struct rs_rate *rate)
1032 {
1033         u8 low;
1034         u16 high_low;
1035         u16 rate_mask;
1036         struct iwl_mvm *mvm = lq_sta->pers.drv;
1037
1038         rate_mask = rs_get_supported_rates(lq_sta, rate);
1039         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1040                                         rate->type);
1041         low = high_low & 0xff;
1042
1043         /* Bottom rate of column reached */
1044         if (low == IWL_RATE_INVALID)
1045                 return true;
1046
1047         rate->index = low;
1048         return false;
1049 }
1050
1051 /* Get the next rate to use following a column downgrade */
1052 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1053                                           struct rs_rate *rate)
1054 {
1055         struct iwl_mvm *mvm = lq_sta->pers.drv;
1056
1057         if (is_legacy(rate)) {
1058                 /* No column to downgrade from Legacy */
1059                 return;
1060         } else if (is_siso(rate)) {
1061                 /* Downgrade to Legacy if we were in SISO */
1062                 if (lq_sta->band == NL80211_BAND_5GHZ)
1063                         rate->type = LQ_LEGACY_A;
1064                 else
1065                         rate->type = LQ_LEGACY_G;
1066
1067                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1068
1069                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1070                              rate->index > IWL_RATE_MCS_9_INDEX);
1071
1072                 rate->index = rs_ht_to_legacy[rate->index];
1073                 rate->ldpc = false;
1074         } else {
1075                 /* Downgrade to SISO with same MCS if in MIMO  */
1076                 rate->type = is_vht_mimo2(rate) ?
1077                         LQ_VHT_SISO : LQ_HT_SISO;
1078         }
1079
1080         if (num_of_ant(rate->ant) > 1)
1081                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1082
1083         /* Relevant in both switching to SISO or Legacy */
1084         rate->sgi = false;
1085
1086         if (!rs_rate_supported(lq_sta, rate))
1087                 rs_get_lower_rate_in_column(lq_sta, rate);
1088 }
1089
1090 /* Check if both rates are identical
1091  * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1092  * with a rate indicating STBC/BFER and ANT_AB.
1093  */
1094 static inline bool rs_rate_equal(struct rs_rate *a,
1095                                  struct rs_rate *b,
1096                                  bool allow_ant_mismatch)
1097
1098 {
1099         bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1100                 (a->bfer == b->bfer);
1101
1102         if (allow_ant_mismatch) {
1103                 if (a->stbc || a->bfer) {
1104                         WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1105                                   a->stbc, a->bfer, a->ant);
1106                         ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1107                 } else if (b->stbc || b->bfer) {
1108                         WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1109                                   b->stbc, b->bfer, b->ant);
1110                         ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1111                 }
1112         }
1113
1114         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1115                 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1116 }
1117
1118 /* Check if both rates share the same column */
1119 static inline bool rs_rate_column_match(struct rs_rate *a,
1120                                         struct rs_rate *b)
1121 {
1122         bool ant_match;
1123
1124         if (a->stbc || a->bfer)
1125                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1126         else
1127                 ant_match = (a->ant == b->ant);
1128
1129         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1130                 && ant_match;
1131 }
1132
1133 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1134 {
1135         if (is_legacy(rate)) {
1136                 if (rate->ant == ANT_A)
1137                         return RS_COLUMN_LEGACY_ANT_A;
1138
1139                 if (rate->ant == ANT_B)
1140                         return RS_COLUMN_LEGACY_ANT_B;
1141
1142                 goto err;
1143         }
1144
1145         if (is_siso(rate)) {
1146                 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1147                         return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1148                                 RS_COLUMN_SISO_ANT_A;
1149
1150                 if (rate->ant == ANT_B)
1151                         return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1152                                 RS_COLUMN_SISO_ANT_B;
1153
1154                 goto err;
1155         }
1156
1157         if (is_mimo(rate))
1158                 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1159
1160 err:
1161         return RS_COLUMN_INVALID;
1162 }
1163
1164 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1165 {
1166         u8 tid = IWL_MAX_TID_COUNT;
1167
1168         if (ieee80211_is_data_qos(hdr->frame_control)) {
1169                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1170                 tid = qc[0] & 0xf;
1171         }
1172
1173         if (unlikely(tid > IWL_MAX_TID_COUNT))
1174                 tid = IWL_MAX_TID_COUNT;
1175
1176         return tid;
1177 }
1178
1179 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1180                           int tid, struct ieee80211_tx_info *info, bool ndp)
1181 {
1182         int legacy_success;
1183         int retries;
1184         int i;
1185         struct iwl_lq_cmd *table;
1186         u32 lq_hwrate;
1187         struct rs_rate lq_rate, tx_resp_rate;
1188         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1189         u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1190         u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1191         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1192         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1193         bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa,
1194                                              IWL_UCODE_TLV_API_LQ_SS_PARAMS);
1195
1196         /* Treat uninitialized rate scaling data same as non-existing. */
1197         if (!lq_sta) {
1198                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1199                 return;
1200         } else if (!lq_sta->pers.drv) {
1201                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1202                 return;
1203         }
1204
1205         /* This packet was aggregated but doesn't carry status info */
1206         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1207             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1208                 return;
1209
1210         rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1211
1212 #ifdef CONFIG_MAC80211_DEBUGFS
1213         /* Disable last tx check if we are debugging with fixed rate but
1214          * update tx stats */
1215         if (lq_sta->pers.dbg_fixed_rate) {
1216                 int index = tx_resp_rate.index;
1217                 enum rs_column column;
1218                 int attempts, success;
1219
1220                 column = rs_get_column_from_rate(&tx_resp_rate);
1221                 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1222                               "Can't map rate 0x%x to column",
1223                               tx_resp_hwrate))
1224                         return;
1225
1226                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1227                         attempts = info->status.ampdu_len;
1228                         success = info->status.ampdu_ack_len;
1229                 } else {
1230                         attempts = info->status.rates[0].count;
1231                         success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1232                 }
1233
1234                 lq_sta->pers.tx_stats[column][index].total += attempts;
1235                 lq_sta->pers.tx_stats[column][index].success += success;
1236
1237                 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1238                                tx_resp_hwrate, success, attempts);
1239                 return;
1240         }
1241 #endif
1242
1243         if (time_after(jiffies,
1244                        (unsigned long)(lq_sta->last_tx +
1245                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1246                 int t;
1247
1248                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1249                 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1250                         ieee80211_stop_tx_ba_session(sta, t);
1251
1252                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1253                 return;
1254         }
1255         lq_sta->last_tx = jiffies;
1256
1257         /* Ignore this Tx frame response if its initial rate doesn't match
1258          * that of latest Link Quality command.  There may be stragglers
1259          * from a previous Link Quality command, but we're no longer interested
1260          * in those; they're either from the "active" mode while we're trying
1261          * to check "search" mode, or a prior "search" mode after we've moved
1262          * to a new "search" mode (which might become the new "active" mode).
1263          */
1264         table = &lq_sta->lq;
1265         lq_hwrate = le32_to_cpu(table->rs_table[0]);
1266         rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1267
1268         /* Here we actually compare this rate to the latest LQ command */
1269         if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1270                 IWL_DEBUG_RATE(mvm,
1271                                "initial tx resp rate 0x%x does not match 0x%x\n",
1272                                tx_resp_hwrate, lq_hwrate);
1273
1274                 /*
1275                  * Since rates mis-match, the last LQ command may have failed.
1276                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1277                  * ... driver.
1278                  */
1279                 lq_sta->missed_rate_counter++;
1280                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1281                         lq_sta->missed_rate_counter = 0;
1282                         IWL_DEBUG_RATE(mvm,
1283                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1284                                        lq_sta->rs_state);
1285                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1286                 }
1287                 /* Regardless, ignore this status info for outdated rate */
1288                 return;
1289         } else
1290                 /* Rate did match, so reset the missed_rate_counter */
1291                 lq_sta->missed_rate_counter = 0;
1292
1293         if (!lq_sta->search_better_tbl) {
1294                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1295                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1296         } else {
1297                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1298                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1299         }
1300
1301         if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1302                 IWL_DEBUG_RATE(mvm,
1303                                "Neither active nor search matches tx rate\n");
1304                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1305                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1306                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1307                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1308                 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1309
1310                 /*
1311                  * no matching table found, let's by-pass the data collection
1312                  * and continue to perform rate scale to find the rate table
1313                  */
1314                 rs_stay_in_table(lq_sta, true);
1315                 goto done;
1316         }
1317
1318         /*
1319          * Updating the frame history depends on whether packets were
1320          * aggregated.
1321          *
1322          * For aggregation, all packets were transmitted at the same rate, the
1323          * first index into rate scale table.
1324          */
1325         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1326                 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1327                                     info->status.ampdu_len,
1328                                     info->status.ampdu_ack_len,
1329                                     reduced_txp);
1330
1331                 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1332                  * it as a single frame loss as we don't want the success ratio
1333                  * to dip too quickly because a BA wasn't received.
1334                  * For TPC, there's no need for this optimisation since we want
1335                  * to recover very quickly from a bad power reduction and,
1336                  * therefore we'd like the success ratio to get an immediate hit
1337                  * when failing to get a BA, so we'd switch back to a lower or
1338                  * zero power reduction. When FW transmits agg with a rate
1339                  * different from the initial rate, it will not use reduced txp
1340                  * and will send BA notification twice (one empty with reduced
1341                  * txp equal to the value from LQ and one with reduced txp 0).
1342                  * We need to update counters for each txp level accordingly.
1343                  */
1344                 if (info->status.ampdu_ack_len == 0)
1345                         info->status.ampdu_len = 1;
1346
1347                 rs_collect_tlc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1348                                     info->status.ampdu_len,
1349                                     info->status.ampdu_ack_len);
1350
1351                 /* Update success/fail counts if not searching for new mode */
1352                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1353                         lq_sta->total_success += info->status.ampdu_ack_len;
1354                         lq_sta->total_failed += (info->status.ampdu_len -
1355                                         info->status.ampdu_ack_len);
1356                 }
1357         } else {
1358                 /* For legacy, update frame history with for each Tx retry. */
1359                 retries = info->status.rates[0].count - 1;
1360                 /* HW doesn't send more than 15 retries */
1361                 retries = min(retries, 15);
1362
1363                 /* The last transmission may have been successful */
1364                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1365                 /* Collect data for each rate used during failed TX attempts */
1366                 for (i = 0; i <= retries; ++i) {
1367                         lq_hwrate = le32_to_cpu(table->rs_table[i]);
1368                         rs_rate_from_ucode_rate(lq_hwrate, info->band,
1369                                                 &lq_rate);
1370                         /*
1371                          * Only collect stats if retried rate is in the same RS
1372                          * table as active/search.
1373                          */
1374                         if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1375                                 tmp_tbl = curr_tbl;
1376                         else if (rs_rate_column_match(&lq_rate,
1377                                                       &other_tbl->rate))
1378                                 tmp_tbl = other_tbl;
1379                         else
1380                                 continue;
1381
1382                         rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1383                                             lq_rate.index, 1,
1384                                             i < retries ? 0 : legacy_success,
1385                                             reduced_txp);
1386                         rs_collect_tlc_data(mvm, lq_sta, tmp_tbl,
1387                                             lq_rate.index, 1,
1388                                             i < retries ? 0 : legacy_success);
1389                 }
1390
1391                 /* Update success/fail counts if not searching for new mode */
1392                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1393                         lq_sta->total_success += legacy_success;
1394                         lq_sta->total_failed += retries + (1 - legacy_success);
1395                 }
1396         }
1397         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1398         lq_sta->last_rate_n_flags = lq_hwrate;
1399         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1400 done:
1401         /* See if there's a better rate or modulation mode to try. */
1402         if (sta->supp_rates[info->band])
1403                 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
1404 }
1405
1406 /*
1407  * mac80211 sends us Tx status
1408  */
1409 static void rs_mac80211_tx_status(void *mvm_r,
1410                                   struct ieee80211_supported_band *sband,
1411                                   struct ieee80211_sta *sta, void *priv_sta,
1412                                   struct sk_buff *skb)
1413 {
1414         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1415         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1416         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1417         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1418
1419         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1420                 return;
1421
1422         if (!ieee80211_is_data(hdr->frame_control) ||
1423             info->flags & IEEE80211_TX_CTL_NO_ACK)
1424                 return;
1425
1426         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1427                              ieee80211_is_qos_nullfunc(hdr->frame_control));
1428 }
1429
1430 /*
1431  * Begin a period of staying with a selected modulation mode.
1432  * Set "stay_in_tbl" flag to prevent any mode switches.
1433  * Set frame tx success limits according to legacy vs. high-throughput,
1434  * and reset overall (spanning all rates) tx success history statistics.
1435  * These control how long we stay using same modulation mode before
1436  * searching for a new mode.
1437  */
1438 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1439                                  struct iwl_lq_sta *lq_sta)
1440 {
1441         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1442         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1443         if (is_legacy) {
1444                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1445                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1446                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1447         } else {
1448                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1449                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1450                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1451         }
1452         lq_sta->table_count = 0;
1453         lq_sta->total_failed = 0;
1454         lq_sta->total_success = 0;
1455         lq_sta->flush_timer = jiffies;
1456         lq_sta->visited_columns = 0;
1457 }
1458
1459 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1460 {
1461         if (rate_mask)
1462                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1463         return IWL_RATE_INVALID;
1464 }
1465
1466 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1467                                    const struct rs_tx_column *column)
1468 {
1469         switch (column->mode) {
1470         case RS_LEGACY:
1471                 return lq_sta->max_legacy_rate_idx;
1472         case RS_SISO:
1473                 return lq_sta->max_siso_rate_idx;
1474         case RS_MIMO2:
1475                 return lq_sta->max_mimo2_rate_idx;
1476         default:
1477                 WARN_ON_ONCE(1);
1478         }
1479
1480         return lq_sta->max_legacy_rate_idx;
1481 }
1482
1483 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1484                                             const struct rs_tx_column *column,
1485                                             u32 bw)
1486 {
1487         /* Used to choose among HT tables */
1488         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1489
1490         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1491                          column->mode != RS_SISO &&
1492                          column->mode != RS_MIMO2))
1493                 return expected_tpt_legacy;
1494
1495         /* Legacy rates have only one table */
1496         if (column->mode == RS_LEGACY)
1497                 return expected_tpt_legacy;
1498
1499         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1500         /* Choose among many HT tables depending on number of streams
1501          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1502          * status */
1503         if (column->mode == RS_SISO) {
1504                 switch (bw) {
1505                 case RATE_MCS_CHAN_WIDTH_20:
1506                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1507                         break;
1508                 case RATE_MCS_CHAN_WIDTH_40:
1509                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1510                         break;
1511                 case RATE_MCS_CHAN_WIDTH_80:
1512                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1513                         break;
1514                 case RATE_MCS_CHAN_WIDTH_160:
1515                         ht_tbl_pointer = expected_tpt_siso_160MHz;
1516                         break;
1517                 default:
1518                         WARN_ON_ONCE(1);
1519                 }
1520         } else if (column->mode == RS_MIMO2) {
1521                 switch (bw) {
1522                 case RATE_MCS_CHAN_WIDTH_20:
1523                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1524                         break;
1525                 case RATE_MCS_CHAN_WIDTH_40:
1526                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1527                         break;
1528                 case RATE_MCS_CHAN_WIDTH_80:
1529                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1530                         break;
1531                 case RATE_MCS_CHAN_WIDTH_160:
1532                         ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1533                         break;
1534                 default:
1535                         WARN_ON_ONCE(1);
1536                 }
1537         } else {
1538                 WARN_ON_ONCE(1);
1539         }
1540
1541         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1542                 return ht_tbl_pointer[0];
1543         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1544                 return ht_tbl_pointer[1];
1545         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1546                 return ht_tbl_pointer[2];
1547         else                                            /* AGG+SGI */
1548                 return ht_tbl_pointer[3];
1549 }
1550
1551 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1552                                       struct iwl_scale_tbl_info *tbl)
1553 {
1554         struct rs_rate *rate = &tbl->rate;
1555         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1556
1557         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1558 }
1559
1560 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1561                             struct iwl_lq_sta *lq_sta,
1562                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1563                             unsigned long rate_mask, s8 index)
1564 {
1565         struct iwl_scale_tbl_info *active_tbl =
1566             &(lq_sta->lq_info[lq_sta->active_tbl]);
1567         s32 success_ratio = active_tbl->win[index].success_ratio;
1568         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1569         const u16 *tpt_tbl = tbl->expected_tpt;
1570         u16 high_low;
1571         u32 target_tpt;
1572         int rate_idx;
1573
1574         if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1575                 target_tpt = 100 * expected_current_tpt;
1576                 IWL_DEBUG_RATE(mvm,
1577                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1578                                success_ratio, target_tpt);
1579         } else {
1580                 target_tpt = lq_sta->last_tpt;
1581                 IWL_DEBUG_RATE(mvm,
1582                                "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1583                                success_ratio, target_tpt);
1584         }
1585
1586         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1587
1588         while (rate_idx != IWL_RATE_INVALID) {
1589                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1590                         break;
1591
1592                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1593                                                 tbl->rate.type);
1594
1595                 rate_idx = (high_low >> 8) & 0xff;
1596         }
1597
1598         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1599                        rate_idx, target_tpt,
1600                        rate_idx != IWL_RATE_INVALID ?
1601                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1602
1603         return rate_idx;
1604 }
1605
1606 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1607 {
1608         switch (sta->bandwidth) {
1609         case IEEE80211_STA_RX_BW_160:
1610                 return RATE_MCS_CHAN_WIDTH_160;
1611         case IEEE80211_STA_RX_BW_80:
1612                 return RATE_MCS_CHAN_WIDTH_80;
1613         case IEEE80211_STA_RX_BW_40:
1614                 return RATE_MCS_CHAN_WIDTH_40;
1615         case IEEE80211_STA_RX_BW_20:
1616         default:
1617                 return RATE_MCS_CHAN_WIDTH_20;
1618         }
1619 }
1620
1621 /*
1622  * Check whether we should continue using same modulation mode, or
1623  * begin search for a new mode, based on:
1624  * 1) # tx successes or failures while using this mode
1625  * 2) # times calling this function
1626  * 3) elapsed time in this mode (not used, for now)
1627  */
1628 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1629 {
1630         struct iwl_scale_tbl_info *tbl;
1631         int active_tbl;
1632         int flush_interval_passed = 0;
1633         struct iwl_mvm *mvm;
1634
1635         mvm = lq_sta->pers.drv;
1636         active_tbl = lq_sta->active_tbl;
1637
1638         tbl = &(lq_sta->lq_info[active_tbl]);
1639
1640         /* If we've been disallowing search, see if we should now allow it */
1641         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1642                 /* Elapsed time using current modulation mode */
1643                 if (lq_sta->flush_timer)
1644                         flush_interval_passed =
1645                                 time_after(jiffies,
1646                                            (unsigned long)(lq_sta->flush_timer +
1647                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1648
1649                 /*
1650                  * Check if we should allow search for new modulation mode.
1651                  * If many frames have failed or succeeded, or we've used
1652                  * this same modulation for a long time, allow search, and
1653                  * reset history stats that keep track of whether we should
1654                  * allow a new search.  Also (below) reset all bitmaps and
1655                  * stats in active history.
1656                  */
1657                 if (force_search ||
1658                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1659                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1660                     ((!lq_sta->search_better_tbl) &&
1661                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1662                         IWL_DEBUG_RATE(mvm,
1663                                        "LQ: stay is expired %d %d %d\n",
1664                                      lq_sta->total_failed,
1665                                      lq_sta->total_success,
1666                                      flush_interval_passed);
1667
1668                         /* Allow search for new mode */
1669                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1670                         IWL_DEBUG_RATE(mvm,
1671                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1672                         lq_sta->total_failed = 0;
1673                         lq_sta->total_success = 0;
1674                         lq_sta->flush_timer = 0;
1675                         /* mark the current column as visited */
1676                         lq_sta->visited_columns = BIT(tbl->column);
1677                 /*
1678                  * Else if we've used this modulation mode enough repetitions
1679                  * (regardless of elapsed time or success/failure), reset
1680                  * history bitmaps and rate-specific stats for all rates in
1681                  * active table.
1682                  */
1683                 } else {
1684                         lq_sta->table_count++;
1685                         if (lq_sta->table_count >=
1686                             lq_sta->table_count_limit) {
1687                                 lq_sta->table_count = 0;
1688
1689                                 IWL_DEBUG_RATE(mvm,
1690                                                "LQ: stay in table clear win\n");
1691                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1692                         }
1693                 }
1694
1695                 /* If transitioning to allow "search", reset all history
1696                  * bitmaps and stats in active table (this will become the new
1697                  * "search" table). */
1698                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1699                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1700                 }
1701         }
1702 }
1703
1704 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1705                              struct iwl_scale_tbl_info *tbl,
1706                              enum rs_action scale_action)
1707 {
1708         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
1709
1710         if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1711             tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1712             scale_action == RS_ACTION_DOWNSCALE)
1713                 sta_priv->tlc_amsdu = false;
1714         else
1715                 sta_priv->tlc_amsdu = true;
1716 }
1717
1718 /*
1719  * setup rate table in uCode
1720  */
1721 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1722                                struct ieee80211_sta *sta,
1723                                struct iwl_lq_sta *lq_sta,
1724                                struct iwl_scale_tbl_info *tbl)
1725 {
1726         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1727         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1728 }
1729
1730 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1731                               struct ieee80211_sta *sta,
1732                               struct iwl_lq_sta *lq_sta,
1733                               struct iwl_scale_tbl_info *tbl,
1734                               enum rs_action scale_action)
1735 {
1736         if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1737                 return false;
1738
1739         if (!is_vht_siso(&tbl->rate))
1740                 return false;
1741
1742         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1743             (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1744             (scale_action == RS_ACTION_DOWNSCALE)) {
1745                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1746                 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1747                 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1748                 goto tweaked;
1749         }
1750
1751         /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1752          * sustainable, i.e. we're past the test window. We can't go back
1753          * if MCS5 is just tested as this will happen always after switching
1754          * to 20Mhz MCS4 because the rate stats are cleared.
1755          */
1756         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1757             (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1758              (scale_action == RS_ACTION_STAY)) ||
1759              ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1760               (scale_action == RS_ACTION_UPSCALE)))) {
1761                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1762                 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1763                 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1764                 goto tweaked;
1765         }
1766
1767         return false;
1768
1769 tweaked:
1770         rs_set_expected_tpt_table(lq_sta, tbl);
1771         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1772         return true;
1773 }
1774
1775 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1776                                          struct iwl_lq_sta *lq_sta,
1777                                          struct ieee80211_sta *sta,
1778                                          struct iwl_scale_tbl_info *tbl)
1779 {
1780         int i, j, max_rate;
1781         enum rs_column next_col_id;
1782         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1783         const struct rs_tx_column *next_col;
1784         allow_column_func_t allow_func;
1785         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1786         const u16 *expected_tpt_tbl;
1787         u16 tpt, max_expected_tpt;
1788
1789         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1790                 next_col_id = curr_col->next_columns[i];
1791
1792                 if (next_col_id == RS_COLUMN_INVALID)
1793                         continue;
1794
1795                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1796                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1797                                        next_col_id);
1798                         continue;
1799                 }
1800
1801                 next_col = &rs_tx_columns[next_col_id];
1802
1803                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1804                         IWL_DEBUG_RATE(mvm,
1805                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1806                                        next_col_id, valid_ants, next_col->ant);
1807                         continue;
1808                 }
1809
1810                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1811                         allow_func = next_col->checks[j];
1812                         if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1813                                                       next_col))
1814                                 break;
1815                 }
1816
1817                 if (j != MAX_COLUMN_CHECKS) {
1818                         IWL_DEBUG_RATE(mvm,
1819                                        "Skip column %d: not allowed (check %d failed)\n",
1820                                        next_col_id, j);
1821
1822                         continue;
1823                 }
1824
1825                 tpt = lq_sta->last_tpt / 100;
1826                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1827                                                      rs_bw_from_sta_bw(sta));
1828                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1829                         continue;
1830
1831                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1832                 if (max_rate == IWL_RATE_INVALID) {
1833                         IWL_DEBUG_RATE(mvm,
1834                                        "Skip column %d: no rate is allowed in this column\n",
1835                                        next_col_id);
1836                         continue;
1837                 }
1838
1839                 max_expected_tpt = expected_tpt_tbl[max_rate];
1840                 if (tpt >= max_expected_tpt) {
1841                         IWL_DEBUG_RATE(mvm,
1842                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1843                                        next_col_id, max_expected_tpt, tpt);
1844                         continue;
1845                 }
1846
1847                 IWL_DEBUG_RATE(mvm,
1848                                "Found potential column %d. Max expected %d current %d\n",
1849                                next_col_id, max_expected_tpt, tpt);
1850                 break;
1851         }
1852
1853         if (i == MAX_NEXT_COLUMNS)
1854                 return RS_COLUMN_INVALID;
1855
1856         return next_col_id;
1857 }
1858
1859 static int rs_switch_to_column(struct iwl_mvm *mvm,
1860                                struct iwl_lq_sta *lq_sta,
1861                                struct ieee80211_sta *sta,
1862                                enum rs_column col_id)
1863 {
1864         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1865         struct iwl_scale_tbl_info *search_tbl =
1866                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1867         struct rs_rate *rate = &search_tbl->rate;
1868         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1869         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1870         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1871                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1872         unsigned long rate_mask = 0;
1873         u32 rate_idx = 0;
1874
1875         memcpy(search_tbl, tbl, sz);
1876
1877         rate->sgi = column->sgi;
1878         rate->ant = column->ant;
1879
1880         if (column->mode == RS_LEGACY) {
1881                 if (lq_sta->band == NL80211_BAND_5GHZ)
1882                         rate->type = LQ_LEGACY_A;
1883                 else
1884                         rate->type = LQ_LEGACY_G;
1885
1886                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1887                 rate->ldpc = false;
1888                 rate_mask = lq_sta->active_legacy_rate;
1889         } else if (column->mode == RS_SISO) {
1890                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1891                 rate_mask = lq_sta->active_siso_rate;
1892         } else if (column->mode == RS_MIMO2) {
1893                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1894                 rate_mask = lq_sta->active_mimo2_rate;
1895         } else {
1896                 WARN_ONCE(1, "Bad column mode");
1897         }
1898
1899         if (column->mode != RS_LEGACY) {
1900                 rate->bw = rs_bw_from_sta_bw(sta);
1901                 rate->ldpc = lq_sta->ldpc;
1902         }
1903
1904         search_tbl->column = col_id;
1905         rs_set_expected_tpt_table(lq_sta, search_tbl);
1906
1907         lq_sta->visited_columns |= BIT(col_id);
1908
1909         /* Get the best matching rate if we're changing modes. e.g.
1910          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1911          */
1912         if (curr_column->mode != column->mode) {
1913                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1914                                             rate_mask, rate->index);
1915
1916                 if ((rate_idx == IWL_RATE_INVALID) ||
1917                     !(BIT(rate_idx) & rate_mask)) {
1918                         IWL_DEBUG_RATE(mvm,
1919                                        "can not switch with index %d"
1920                                        " rate mask %lx\n",
1921                                        rate_idx, rate_mask);
1922
1923                         goto err;
1924                 }
1925
1926                 rate->index = rate_idx;
1927         }
1928
1929         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1930                        col_id, rate->index);
1931
1932         return 0;
1933
1934 err:
1935         rate->type = LQ_NONE;
1936         return -1;
1937 }
1938
1939 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1940                                          struct iwl_scale_tbl_info *tbl,
1941                                          s32 sr, int low, int high,
1942                                          int current_tpt,
1943                                          int low_tpt, int high_tpt)
1944 {
1945         enum rs_action action = RS_ACTION_STAY;
1946
1947         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1948             (current_tpt == 0)) {
1949                 IWL_DEBUG_RATE(mvm,
1950                                "Decrease rate because of low SR\n");
1951                 return RS_ACTION_DOWNSCALE;
1952         }
1953
1954         if ((low_tpt == IWL_INVALID_VALUE) &&
1955             (high_tpt == IWL_INVALID_VALUE) &&
1956             (high != IWL_RATE_INVALID)) {
1957                 IWL_DEBUG_RATE(mvm,
1958                                "No data about high/low rates. Increase rate\n");
1959                 return RS_ACTION_UPSCALE;
1960         }
1961
1962         if ((high_tpt == IWL_INVALID_VALUE) &&
1963             (high != IWL_RATE_INVALID) &&
1964             (low_tpt != IWL_INVALID_VALUE) &&
1965             (low_tpt < current_tpt)) {
1966                 IWL_DEBUG_RATE(mvm,
1967                                "No data about high rate and low rate is worse. Increase rate\n");
1968                 return RS_ACTION_UPSCALE;
1969         }
1970
1971         if ((high_tpt != IWL_INVALID_VALUE) &&
1972             (high_tpt > current_tpt)) {
1973                 IWL_DEBUG_RATE(mvm,
1974                                "Higher rate is better. Increate rate\n");
1975                 return RS_ACTION_UPSCALE;
1976         }
1977
1978         if ((low_tpt != IWL_INVALID_VALUE) &&
1979             (high_tpt != IWL_INVALID_VALUE) &&
1980             (low_tpt < current_tpt) &&
1981             (high_tpt < current_tpt)) {
1982                 IWL_DEBUG_RATE(mvm,
1983                                "Both high and low are worse. Maintain rate\n");
1984                 return RS_ACTION_STAY;
1985         }
1986
1987         if ((low_tpt != IWL_INVALID_VALUE) &&
1988             (low_tpt > current_tpt)) {
1989                 IWL_DEBUG_RATE(mvm,
1990                                "Lower rate is better\n");
1991                 action = RS_ACTION_DOWNSCALE;
1992                 goto out;
1993         }
1994
1995         if ((low_tpt == IWL_INVALID_VALUE) &&
1996             (low != IWL_RATE_INVALID)) {
1997                 IWL_DEBUG_RATE(mvm,
1998                                "No data about lower rate\n");
1999                 action = RS_ACTION_DOWNSCALE;
2000                 goto out;
2001         }
2002
2003         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
2004
2005 out:
2006         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
2007                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
2008                         IWL_DEBUG_RATE(mvm,
2009                                        "SR is above NO DECREASE. Avoid downscale\n");
2010                         action = RS_ACTION_STAY;
2011                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
2012                         IWL_DEBUG_RATE(mvm,
2013                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
2014                         action = RS_ACTION_STAY;
2015                 } else {
2016                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
2017                 }
2018         }
2019
2020         return action;
2021 }
2022
2023 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2024                           struct iwl_lq_sta *lq_sta)
2025 {
2026         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
2027          * supports STBC of at least 1*SS
2028          */
2029         if (!lq_sta->stbc_capable)
2030                 return false;
2031
2032         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2033                 return false;
2034
2035         return true;
2036 }
2037
2038 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2039                                 int *weaker, int *stronger)
2040 {
2041         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2042         if (*weaker > TPC_MAX_REDUCTION)
2043                 *weaker = TPC_INVALID;
2044
2045         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2046         if (*stronger < 0)
2047                 *stronger = TPC_INVALID;
2048 }
2049
2050 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2051                            struct rs_rate *rate, enum nl80211_band band)
2052 {
2053         int index = rate->index;
2054         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2055         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2056                                 !vif->bss_conf.ps);
2057
2058         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2059                        cam, sta_ps_disabled);
2060         /*
2061          * allow tpc only if power management is enabled, or bt coex
2062          * activity grade allows it and we are on 2.4Ghz.
2063          */
2064         if ((cam || sta_ps_disabled) &&
2065             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2066                 return false;
2067
2068         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2069         if (is_legacy(rate))
2070                 return index == IWL_RATE_54M_INDEX;
2071         if (is_ht(rate))
2072                 return index == IWL_RATE_MCS_7_INDEX;
2073         if (is_vht(rate))
2074                 return index == IWL_RATE_MCS_7_INDEX ||
2075                        index == IWL_RATE_MCS_8_INDEX ||
2076                        index == IWL_RATE_MCS_9_INDEX;
2077
2078         WARN_ON_ONCE(1);
2079         return false;
2080 }
2081
2082 enum tpc_action {
2083         TPC_ACTION_STAY,
2084         TPC_ACTION_DECREASE,
2085         TPC_ACTION_INCREASE,
2086         TPC_ACTION_NO_RESTIRCTION,
2087 };
2088
2089 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2090                                          s32 sr, int weak, int strong,
2091                                          int current_tpt,
2092                                          int weak_tpt, int strong_tpt)
2093 {
2094         /* stay until we have valid tpt */
2095         if (current_tpt == IWL_INVALID_VALUE) {
2096                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2097                 return TPC_ACTION_STAY;
2098         }
2099
2100         /* Too many failures, increase txp */
2101         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2102             current_tpt == 0) {
2103                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2104                 return TPC_ACTION_NO_RESTIRCTION;
2105         }
2106
2107         /* try decreasing first if applicable */
2108         if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2109             weak != TPC_INVALID) {
2110                 if (weak_tpt == IWL_INVALID_VALUE &&
2111                     (strong_tpt == IWL_INVALID_VALUE ||
2112                      current_tpt >= strong_tpt)) {
2113                         IWL_DEBUG_RATE(mvm,
2114                                        "no weak txp measurement. decrease txp\n");
2115                         return TPC_ACTION_DECREASE;
2116                 }
2117
2118                 if (weak_tpt > current_tpt) {
2119                         IWL_DEBUG_RATE(mvm,
2120                                        "lower txp has better tpt. decrease txp\n");
2121                         return TPC_ACTION_DECREASE;
2122                 }
2123         }
2124
2125         /* next, increase if needed */
2126         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2127             strong != TPC_INVALID) {
2128                 if (weak_tpt == IWL_INVALID_VALUE &&
2129                     strong_tpt != IWL_INVALID_VALUE &&
2130                     current_tpt < strong_tpt) {
2131                         IWL_DEBUG_RATE(mvm,
2132                                        "higher txp has better tpt. increase txp\n");
2133                         return TPC_ACTION_INCREASE;
2134                 }
2135
2136                 if (weak_tpt < current_tpt &&
2137                     (strong_tpt == IWL_INVALID_VALUE ||
2138                      strong_tpt > current_tpt)) {
2139                         IWL_DEBUG_RATE(mvm,
2140                                        "lower txp has worse tpt. increase txp\n");
2141                         return TPC_ACTION_INCREASE;
2142                 }
2143         }
2144
2145         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2146         return TPC_ACTION_STAY;
2147 }
2148
2149 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2150                            struct ieee80211_sta *sta,
2151                            struct iwl_lq_sta *lq_sta,
2152                            struct iwl_scale_tbl_info *tbl)
2153 {
2154         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2155         struct ieee80211_vif *vif = mvm_sta->vif;
2156         struct ieee80211_chanctx_conf *chanctx_conf;
2157         enum nl80211_band band;
2158         struct iwl_rate_scale_data *window;
2159         struct rs_rate *rate = &tbl->rate;
2160         enum tpc_action action;
2161         s32 sr;
2162         u8 cur = lq_sta->lq.reduced_tpc;
2163         int current_tpt;
2164         int weak, strong;
2165         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2166
2167 #ifdef CONFIG_MAC80211_DEBUGFS
2168         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2169                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2170                                lq_sta->pers.dbg_fixed_txp_reduction);
2171                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2172                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2173         }
2174 #endif
2175
2176         rcu_read_lock();
2177         chanctx_conf = rcu_dereference(vif->chanctx_conf);
2178         if (WARN_ON(!chanctx_conf))
2179                 band = NUM_NL80211_BANDS;
2180         else
2181                 band = chanctx_conf->def.chan->band;
2182         rcu_read_unlock();
2183
2184         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2185                 IWL_DEBUG_RATE(mvm,
2186                                "tpc is not allowed. remove txp restrictions\n");
2187                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2188                 return cur != TPC_NO_REDUCTION;
2189         }
2190
2191         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2192
2193         /* Collect measured throughputs for current and adjacent rates */
2194         window = tbl->tpc_win;
2195         sr = window[cur].success_ratio;
2196         current_tpt = window[cur].average_tpt;
2197         if (weak != TPC_INVALID)
2198                 weak_tpt = window[weak].average_tpt;
2199         if (strong != TPC_INVALID)
2200                 strong_tpt = window[strong].average_tpt;
2201
2202         IWL_DEBUG_RATE(mvm,
2203                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2204                        cur, current_tpt, sr, weak, strong,
2205                        weak_tpt, strong_tpt);
2206
2207         action = rs_get_tpc_action(mvm, sr, weak, strong,
2208                                    current_tpt, weak_tpt, strong_tpt);
2209
2210         /* override actions if we are on the edge */
2211         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2212                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2213                 action = TPC_ACTION_STAY;
2214         } else if (strong == TPC_INVALID &&
2215                    (action == TPC_ACTION_INCREASE ||
2216                     action == TPC_ACTION_NO_RESTIRCTION)) {
2217                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2218                 action = TPC_ACTION_STAY;
2219         }
2220
2221         switch (action) {
2222         case TPC_ACTION_DECREASE:
2223                 lq_sta->lq.reduced_tpc = weak;
2224                 return true;
2225         case TPC_ACTION_INCREASE:
2226                 lq_sta->lq.reduced_tpc = strong;
2227                 return true;
2228         case TPC_ACTION_NO_RESTIRCTION:
2229                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2230                 return true;
2231         case TPC_ACTION_STAY:
2232                 /* do nothing */
2233                 break;
2234         }
2235         return false;
2236 }
2237
2238 /*
2239  * Do rate scaling and search for new modulation mode.
2240  */
2241 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2242                                   struct ieee80211_sta *sta,
2243                                   struct iwl_lq_sta *lq_sta,
2244                                   int tid, bool ndp)
2245 {
2246         int low = IWL_RATE_INVALID;
2247         int high = IWL_RATE_INVALID;
2248         int index;
2249         struct iwl_rate_scale_data *window = NULL;
2250         int current_tpt = IWL_INVALID_VALUE;
2251         int low_tpt = IWL_INVALID_VALUE;
2252         int high_tpt = IWL_INVALID_VALUE;
2253         u32 fail_count;
2254         enum rs_action scale_action = RS_ACTION_STAY;
2255         u16 rate_mask;
2256         u8 update_lq = 0;
2257         struct iwl_scale_tbl_info *tbl, *tbl1;
2258         u8 active_tbl = 0;
2259         u8 done_search = 0;
2260         u16 high_low;
2261         s32 sr;
2262         u8 prev_agg = lq_sta->is_agg;
2263         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2264         struct iwl_mvm_tid_data *tid_data;
2265         struct rs_rate *rate;
2266
2267         lq_sta->is_agg = !!sta_priv->agg_tids;
2268
2269         /*
2270          * Select rate-scale / modulation-mode table to work with in
2271          * the rest of this function:  "search" if searching for better
2272          * modulation mode, or "active" if doing rate scaling within a mode.
2273          */
2274         if (!lq_sta->search_better_tbl)
2275                 active_tbl = lq_sta->active_tbl;
2276         else
2277                 active_tbl = 1 - lq_sta->active_tbl;
2278
2279         tbl = &(lq_sta->lq_info[active_tbl]);
2280         rate = &tbl->rate;
2281
2282         if (prev_agg != lq_sta->is_agg) {
2283                 IWL_DEBUG_RATE(mvm,
2284                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2285                                prev_agg, lq_sta->is_agg);
2286                 rs_set_expected_tpt_table(lq_sta, tbl);
2287                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2288         }
2289
2290         /* current tx rate */
2291         index = rate->index;
2292
2293         /* rates available for this association, and for modulation mode */
2294         rate_mask = rs_get_supported_rates(lq_sta, rate);
2295
2296         if (!(BIT(index) & rate_mask)) {
2297                 IWL_ERR(mvm, "Current Rate is not valid\n");
2298                 if (lq_sta->search_better_tbl) {
2299                         /* revert to active table if search table is not valid*/
2300                         rate->type = LQ_NONE;
2301                         lq_sta->search_better_tbl = 0;
2302                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2303                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2304                 }
2305                 return;
2306         }
2307
2308         /* Get expected throughput table and history window for current rate */
2309         if (!tbl->expected_tpt) {
2310                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2311                 return;
2312         }
2313
2314         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2315         window = &(tbl->win[index]);
2316
2317         /*
2318          * If there is not enough history to calculate actual average
2319          * throughput, keep analyzing results of more tx frames, without
2320          * changing rate or mode (bypass most of the rest of this function).
2321          * Set up new rate table in uCode only if old rate is not supported
2322          * in current association (use new rate found above).
2323          */
2324         fail_count = window->counter - window->success_counter;
2325         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2326             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2327                 IWL_DEBUG_RATE(mvm,
2328                                "%s: Test Window: succ %d total %d\n",
2329                                rs_pretty_rate(rate),
2330                                window->success_counter, window->counter);
2331
2332                 /* Can't calculate this yet; not enough history */
2333                 window->average_tpt = IWL_INVALID_VALUE;
2334
2335                 /* Should we stay with this modulation mode,
2336                  * or search for a new one? */
2337                 rs_stay_in_table(lq_sta, false);
2338
2339                 return;
2340         }
2341
2342         /* If we are searching for better modulation mode, check success. */
2343         if (lq_sta->search_better_tbl) {
2344                 /* If good success, continue using the "search" mode;
2345                  * no need to send new link quality command, since we're
2346                  * continuing to use the setup that we've been trying. */
2347                 if (window->average_tpt > lq_sta->last_tpt) {
2348                         IWL_DEBUG_RATE(mvm,
2349                                        "SWITCHING TO NEW TABLE SR: %d "
2350                                        "cur-tpt %d old-tpt %d\n",
2351                                        window->success_ratio,
2352                                        window->average_tpt,
2353                                        lq_sta->last_tpt);
2354
2355                         /* Swap tables; "search" becomes "active" */
2356                         lq_sta->active_tbl = active_tbl;
2357                         current_tpt = window->average_tpt;
2358                 /* Else poor success; go back to mode in "active" table */
2359                 } else {
2360                         IWL_DEBUG_RATE(mvm,
2361                                        "GOING BACK TO THE OLD TABLE: SR %d "
2362                                        "cur-tpt %d old-tpt %d\n",
2363                                        window->success_ratio,
2364                                        window->average_tpt,
2365                                        lq_sta->last_tpt);
2366
2367                         /* Nullify "search" table */
2368                         rate->type = LQ_NONE;
2369
2370                         /* Revert to "active" table */
2371                         active_tbl = lq_sta->active_tbl;
2372                         tbl = &(lq_sta->lq_info[active_tbl]);
2373
2374                         /* Revert to "active" rate and throughput info */
2375                         index = tbl->rate.index;
2376                         current_tpt = lq_sta->last_tpt;
2377
2378                         /* Need to set up a new rate table in uCode */
2379                         update_lq = 1;
2380                 }
2381
2382                 /* Either way, we've made a decision; modulation mode
2383                  * search is done, allow rate adjustment next time. */
2384                 lq_sta->search_better_tbl = 0;
2385                 done_search = 1;        /* Don't switch modes below! */
2386                 goto lq_update;
2387         }
2388
2389         /* (Else) not in search of better modulation mode, try for better
2390          * starting rate, while staying in this mode. */
2391         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2392         low = high_low & 0xff;
2393         high = (high_low >> 8) & 0xff;
2394
2395         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2396
2397         sr = window->success_ratio;
2398
2399         /* Collect measured throughputs for current and adjacent rates */
2400         current_tpt = window->average_tpt;
2401         if (low != IWL_RATE_INVALID)
2402                 low_tpt = tbl->win[low].average_tpt;
2403         if (high != IWL_RATE_INVALID)
2404                 high_tpt = tbl->win[high].average_tpt;
2405
2406         IWL_DEBUG_RATE(mvm,
2407                        "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2408                        rs_pretty_rate(rate), current_tpt, sr,
2409                        low, high, low_tpt, high_tpt);
2410
2411         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2412                                           current_tpt, low_tpt, high_tpt);
2413
2414         /* Force a search in case BT doesn't like us being in MIMO */
2415         if (is_mimo(rate) &&
2416             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2417                 IWL_DEBUG_RATE(mvm,
2418                                "BT Coex forbids MIMO. Search for new config\n");
2419                 rs_stay_in_table(lq_sta, true);
2420                 goto lq_update;
2421         }
2422
2423         switch (scale_action) {
2424         case RS_ACTION_DOWNSCALE:
2425                 /* Decrease starting rate, update uCode's rate table */
2426                 if (low != IWL_RATE_INVALID) {
2427                         update_lq = 1;
2428                         index = low;
2429                 } else {
2430                         IWL_DEBUG_RATE(mvm,
2431                                        "At the bottom rate. Can't decrease\n");
2432                 }
2433
2434                 break;
2435         case RS_ACTION_UPSCALE:
2436                 /* Increase starting rate, update uCode's rate table */
2437                 if (high != IWL_RATE_INVALID) {
2438                         update_lq = 1;
2439                         index = high;
2440                 } else {
2441                         IWL_DEBUG_RATE(mvm,
2442                                        "At the top rate. Can't increase\n");
2443                 }
2444
2445                 break;
2446         case RS_ACTION_STAY:
2447                 /* No change */
2448                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2449                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2450                 break;
2451         default:
2452                 break;
2453         }
2454
2455 lq_update:
2456         /* Replace uCode's rate table for the destination station. */
2457         if (update_lq) {
2458                 tbl->rate.index = index;
2459                 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2460                         rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2461                 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2462                 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2463         }
2464
2465         rs_stay_in_table(lq_sta, false);
2466
2467         /*
2468          * Search for new modulation mode if we're:
2469          * 1)  Not changing rates right now
2470          * 2)  Not just finishing up a search
2471          * 3)  Allowing a new search
2472          */
2473         if (!update_lq && !done_search &&
2474             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2475             && window->counter) {
2476                 enum rs_column next_column;
2477
2478                 /* Save current throughput to compare with "search" throughput*/
2479                 lq_sta->last_tpt = current_tpt;
2480
2481                 IWL_DEBUG_RATE(mvm,
2482                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2483                                update_lq, done_search, lq_sta->rs_state,
2484                                window->counter);
2485
2486                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2487                 if (next_column != RS_COLUMN_INVALID) {
2488                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2489                                                       next_column);
2490                         if (!ret)
2491                                 lq_sta->search_better_tbl = 1;
2492                 } else {
2493                         IWL_DEBUG_RATE(mvm,
2494                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2495                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2496                 }
2497
2498                 /* If new "search" mode was selected, set up in uCode table */
2499                 if (lq_sta->search_better_tbl) {
2500                         /* Access the "search" table, clear its history. */
2501                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2502                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2503
2504                         /* Use new "search" start rate */
2505                         index = tbl->rate.index;
2506
2507                         rs_dump_rate(mvm, &tbl->rate,
2508                                      "Switch to SEARCH TABLE:");
2509                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2510                 } else {
2511                         done_search = 1;
2512                 }
2513         }
2514
2515         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2516                 /* If the "active" (non-search) mode was legacy,
2517                  * and we've tried switching antennas,
2518                  * but we haven't been able to try HT modes (not available),
2519                  * stay with best antenna legacy modulation for a while
2520                  * before next round of mode comparisons. */
2521                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2522                 if (is_legacy(&tbl1->rate)) {
2523                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2524
2525                         if (tid != IWL_MAX_TID_COUNT) {
2526                                 tid_data = &sta_priv->tid_data[tid];
2527                                 if (tid_data->state != IWL_AGG_OFF) {
2528                                         IWL_DEBUG_RATE(mvm,
2529                                                        "Stop aggregation on tid %d\n",
2530                                                        tid);
2531                                         ieee80211_stop_tx_ba_session(sta, tid);
2532                                 }
2533                         }
2534                         rs_set_stay_in_table(mvm, 1, lq_sta);
2535                 } else {
2536                 /* If we're in an HT mode, and all 3 mode switch actions
2537                  * have been tried and compared, stay in this best modulation
2538                  * mode for a while before next round of mode comparisons. */
2539                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2540                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2541                             (tid != IWL_MAX_TID_COUNT)) {
2542                                 tid_data = &sta_priv->tid_data[tid];
2543                                 if (tid_data->state == IWL_AGG_OFF && !ndp) {
2544                                         IWL_DEBUG_RATE(mvm,
2545                                                        "try to aggregate tid %d\n",
2546                                                        tid);
2547                                         rs_tl_turn_on_agg(mvm, tid,
2548                                                           lq_sta, sta);
2549                                 }
2550                         }
2551                         rs_set_stay_in_table(mvm, 0, lq_sta);
2552                 }
2553         }
2554 }
2555
2556 struct rs_init_rate_info {
2557         s8 rssi;
2558         u8 rate_idx;
2559 };
2560
2561 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2562         { -60, IWL_RATE_54M_INDEX },
2563         { -64, IWL_RATE_48M_INDEX },
2564         { -68, IWL_RATE_36M_INDEX },
2565         { -80, IWL_RATE_24M_INDEX },
2566         { -84, IWL_RATE_18M_INDEX },
2567         { -85, IWL_RATE_12M_INDEX },
2568         { -86, IWL_RATE_11M_INDEX },
2569         { -88, IWL_RATE_5M_INDEX  },
2570         { -90, IWL_RATE_2M_INDEX  },
2571         { S8_MIN, IWL_RATE_1M_INDEX },
2572 };
2573
2574 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2575         { -60, IWL_RATE_54M_INDEX },
2576         { -64, IWL_RATE_48M_INDEX },
2577         { -72, IWL_RATE_36M_INDEX },
2578         { -80, IWL_RATE_24M_INDEX },
2579         { -84, IWL_RATE_18M_INDEX },
2580         { -85, IWL_RATE_12M_INDEX },
2581         { -87, IWL_RATE_9M_INDEX  },
2582         { S8_MIN, IWL_RATE_6M_INDEX },
2583 };
2584
2585 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2586         { -60, IWL_RATE_MCS_7_INDEX },
2587         { -64, IWL_RATE_MCS_6_INDEX },
2588         { -68, IWL_RATE_MCS_5_INDEX },
2589         { -72, IWL_RATE_MCS_4_INDEX },
2590         { -80, IWL_RATE_MCS_3_INDEX },
2591         { -84, IWL_RATE_MCS_2_INDEX },
2592         { -85, IWL_RATE_MCS_1_INDEX },
2593         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2594 };
2595
2596 /* MCS index 9 is not valid for 20MHz VHT channel width,
2597  * but is ok for 40, 80 and 160MHz channels.
2598  */
2599 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2600         { -60, IWL_RATE_MCS_8_INDEX },
2601         { -64, IWL_RATE_MCS_7_INDEX },
2602         { -68, IWL_RATE_MCS_6_INDEX },
2603         { -72, IWL_RATE_MCS_5_INDEX },
2604         { -80, IWL_RATE_MCS_4_INDEX },
2605         { -84, IWL_RATE_MCS_3_INDEX },
2606         { -85, IWL_RATE_MCS_2_INDEX },
2607         { -87, IWL_RATE_MCS_1_INDEX },
2608         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2609 };
2610
2611 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2612         { -60, IWL_RATE_MCS_9_INDEX },
2613         { -64, IWL_RATE_MCS_8_INDEX },
2614         { -68, IWL_RATE_MCS_7_INDEX },
2615         { -72, IWL_RATE_MCS_6_INDEX },
2616         { -80, IWL_RATE_MCS_5_INDEX },
2617         { -84, IWL_RATE_MCS_4_INDEX },
2618         { -85, IWL_RATE_MCS_3_INDEX },
2619         { -87, IWL_RATE_MCS_2_INDEX },
2620         { -88, IWL_RATE_MCS_1_INDEX },
2621         { S8_MIN, IWL_RATE_MCS_0_INDEX },
2622 };
2623
2624 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2625
2626 /* Init the optimal rate based on STA caps
2627  * This combined with rssi is used to report the last tx rate
2628  * to userspace when we haven't transmitted enough frames.
2629  */
2630 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2631                                  struct ieee80211_sta *sta,
2632                                  struct iwl_lq_sta *lq_sta)
2633 {
2634         struct rs_rate *rate = &lq_sta->optimal_rate;
2635
2636         if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2637                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2638         else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2639                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2640         else if (lq_sta->band == NL80211_BAND_5GHZ)
2641                 rate->type = LQ_LEGACY_A;
2642         else
2643                 rate->type = LQ_LEGACY_G;
2644
2645         rate->bw = rs_bw_from_sta_bw(sta);
2646         rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2647
2648         /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2649
2650         if (is_mimo(rate)) {
2651                 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2652         } else if (is_siso(rate)) {
2653                 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2654         } else {
2655                 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2656
2657                 if (lq_sta->band == NL80211_BAND_5GHZ) {
2658                         lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2659                         lq_sta->optimal_nentries =
2660                                 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2661                 } else {
2662                         lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2663                         lq_sta->optimal_nentries =
2664                                 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2665                 }
2666         }
2667
2668         if (is_vht(rate)) {
2669                 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2670                         lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2671                         lq_sta->optimal_nentries =
2672                                 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2673                 } else {
2674                         lq_sta->optimal_rates = rs_optimal_rates_vht;
2675                         lq_sta->optimal_nentries =
2676                                 ARRAY_SIZE(rs_optimal_rates_vht);
2677                 }
2678         } else if (is_ht(rate)) {
2679                 lq_sta->optimal_rates = rs_optimal_rates_ht;
2680                 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2681         }
2682 }
2683
2684 /* Compute the optimal rate index based on RSSI */
2685 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2686                                            struct iwl_lq_sta *lq_sta)
2687 {
2688         struct rs_rate *rate = &lq_sta->optimal_rate;
2689         int i;
2690
2691         rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2692                                      BITS_PER_LONG);
2693
2694         for (i = 0; i < lq_sta->optimal_nentries; i++) {
2695                 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2696
2697                 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2698                     (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2699                         rate->index = rate_idx;
2700                         break;
2701                 }
2702         }
2703
2704         return rate;
2705 }
2706
2707 /* Choose an initial legacy rate and antenna to use based on the RSSI
2708  * of last Rx
2709  */
2710 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2711                                 struct ieee80211_sta *sta,
2712                                 struct iwl_lq_sta *lq_sta,
2713                                 enum nl80211_band band,
2714                                 struct rs_rate *rate)
2715 {
2716         int i, nentries;
2717         unsigned long active_rate;
2718         s8 best_rssi = S8_MIN;
2719         u8 best_ant = ANT_NONE;
2720         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2721         const struct rs_init_rate_info *initial_rates;
2722
2723         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2724                 if (!(lq_sta->pers.chains & BIT(i)))
2725                         continue;
2726
2727                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2728                         best_rssi = lq_sta->pers.chain_signal[i];
2729                         best_ant = BIT(i);
2730                 }
2731         }
2732
2733         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2734                        rs_pretty_ant(best_ant), best_rssi);
2735
2736         if (best_ant != ANT_A && best_ant != ANT_B)
2737                 rate->ant = first_antenna(valid_tx_ant);
2738         else
2739                 rate->ant = best_ant;
2740
2741         rate->sgi = false;
2742         rate->ldpc = false;
2743         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2744
2745         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2746                                      BITS_PER_LONG);
2747
2748         if (band == NL80211_BAND_5GHZ) {
2749                 rate->type = LQ_LEGACY_A;
2750                 initial_rates = rs_optimal_rates_5ghz_legacy;
2751                 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2752         } else {
2753                 rate->type = LQ_LEGACY_G;
2754                 initial_rates = rs_optimal_rates_24ghz_legacy;
2755                 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2756         }
2757
2758         if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2759                 goto out;
2760
2761         /* Start from a higher rate if the corresponding debug capability
2762          * is enabled. The rate is chosen according to AP capabilities.
2763          * In case of VHT/HT when the rssi is low fallback to the case of
2764          * legacy rates.
2765          */
2766         if (sta->vht_cap.vht_supported &&
2767             best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2768                 switch (sta->bandwidth) {
2769                 case IEEE80211_STA_RX_BW_160:
2770                 case IEEE80211_STA_RX_BW_80:
2771                 case IEEE80211_STA_RX_BW_40:
2772                         initial_rates = rs_optimal_rates_vht;
2773                         nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2774                         break;
2775                 case IEEE80211_STA_RX_BW_20:
2776                         initial_rates = rs_optimal_rates_vht_20mhz;
2777                         nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2778                         break;
2779                 default:
2780                         IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2781                         goto out;
2782                 }
2783
2784                 active_rate = lq_sta->active_siso_rate;
2785                 rate->type = LQ_VHT_SISO;
2786                 rate->bw = rs_bw_from_sta_bw(sta);
2787         } else if (sta->ht_cap.ht_supported &&
2788                    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2789                 initial_rates = rs_optimal_rates_ht;
2790                 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2791                 active_rate = lq_sta->active_siso_rate;
2792                 rate->type = LQ_HT_SISO;
2793         } else {
2794                 active_rate = lq_sta->active_legacy_rate;
2795         }
2796
2797         for (i = 0; i < nentries; i++) {
2798                 int rate_idx = initial_rates[i].rate_idx;
2799
2800                 if ((best_rssi >= initial_rates[i].rssi) &&
2801                     (BIT(rate_idx) & active_rate)) {
2802                         rate->index = rate_idx;
2803                         break;
2804                 }
2805         }
2806
2807 out:
2808         rs_dump_rate(mvm, rate, "INITIAL");
2809 }
2810
2811 /* Save info about RSSI of last Rx */
2812 void rs_update_last_rssi(struct iwl_mvm *mvm,
2813                          struct iwl_lq_sta *lq_sta,
2814                          struct ieee80211_rx_status *rx_status)
2815 {
2816         int i;
2817
2818         lq_sta->pers.chains = rx_status->chains;
2819         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2820         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2821         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2822         lq_sta->pers.last_rssi = S8_MIN;
2823
2824         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2825                 if (!(lq_sta->pers.chains & BIT(i)))
2826                         continue;
2827
2828                 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2829                         lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2830         }
2831 }
2832
2833 /**
2834  * rs_initialize_lq - Initialize a station's hardware rate table
2835  *
2836  * The uCode's station table contains a table of fallback rates
2837  * for automatic fallback during transmission.
2838  *
2839  * NOTE: This sets up a default set of values.  These will be replaced later
2840  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2841  *       rc80211_simple.
2842  *
2843  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2844  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2845  *       which requires station table entry to exist).
2846  */
2847 static void rs_initialize_lq(struct iwl_mvm *mvm,
2848                              struct ieee80211_sta *sta,
2849                              struct iwl_lq_sta *lq_sta,
2850                              enum nl80211_band band,
2851                              bool init)
2852 {
2853         struct iwl_scale_tbl_info *tbl;
2854         struct rs_rate *rate;
2855         u8 active_tbl = 0;
2856
2857         if (!sta || !lq_sta)
2858                 return;
2859
2860         if (!lq_sta->search_better_tbl)
2861                 active_tbl = lq_sta->active_tbl;
2862         else
2863                 active_tbl = 1 - lq_sta->active_tbl;
2864
2865         tbl = &(lq_sta->lq_info[active_tbl]);
2866         rate = &tbl->rate;
2867
2868         rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2869         rs_init_optimal_rate(mvm, sta, lq_sta);
2870
2871         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2872         tbl->column = rs_get_column_from_rate(rate);
2873
2874         rs_set_expected_tpt_table(lq_sta, tbl);
2875         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2876         /* TODO restore station should remember the lq cmd */
2877         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2878 }
2879
2880 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2881                         struct ieee80211_tx_rate_control *txrc)
2882 {
2883         struct sk_buff *skb = txrc->skb;
2884         struct iwl_op_mode *op_mode __maybe_unused =
2885                         (struct iwl_op_mode *)mvm_r;
2886         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2887         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2888         struct iwl_lq_sta *lq_sta = mvm_sta;
2889         struct rs_rate *optimal_rate;
2890         u32 last_ucode_rate;
2891
2892         if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2893                 /* if vif isn't initialized mvm doesn't know about
2894                  * this station, so don't do anything with the it
2895                  */
2896                 sta = NULL;
2897                 mvm_sta = NULL;
2898         }
2899
2900         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2901
2902         /* Treat uninitialized rate scaling data same as non-existing. */
2903         if (lq_sta && !lq_sta->pers.drv) {
2904                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2905                 mvm_sta = NULL;
2906         }
2907
2908         /* Send management frames and NO_ACK data using lowest rate. */
2909         if (rate_control_send_low(sta, mvm_sta, txrc))
2910                 return;
2911
2912         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2913                                   info->band, &info->control.rates[0]);
2914         info->control.rates[0].count = 1;
2915
2916         /* Report the optimal rate based on rssi and STA caps if we haven't
2917          * converged yet (too little traffic) or exploring other modulations
2918          */
2919         if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2920                 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2921                 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2922                                                           optimal_rate);
2923                 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2924                                           &txrc->reported_rate);
2925         }
2926 }
2927
2928 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2929                           gfp_t gfp)
2930 {
2931         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2932         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2933         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2934         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2935
2936         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2937
2938         lq_sta->pers.drv = mvm;
2939 #ifdef CONFIG_MAC80211_DEBUGFS
2940         lq_sta->pers.dbg_fixed_rate = 0;
2941         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2942         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2943 #endif
2944         lq_sta->pers.chains = 0;
2945         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2946         lq_sta->pers.last_rssi = S8_MIN;
2947
2948         return &sta_priv->lq_sta;
2949 }
2950
2951 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2952                                        int nss)
2953 {
2954         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2955                 (0x3 << (2 * (nss - 1)));
2956         rx_mcs >>= (2 * (nss - 1));
2957
2958         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2959                 return IWL_RATE_MCS_7_INDEX;
2960         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2961                 return IWL_RATE_MCS_8_INDEX;
2962         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2963                 return IWL_RATE_MCS_9_INDEX;
2964
2965         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2966         return -1;
2967 }
2968
2969 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2970                                      struct ieee80211_sta_vht_cap *vht_cap,
2971                                      struct iwl_lq_sta *lq_sta)
2972 {
2973         int i;
2974         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2975
2976         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2977                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2978                         if (i == IWL_RATE_9M_INDEX)
2979                                 continue;
2980
2981                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2982                         if (i == IWL_RATE_MCS_9_INDEX &&
2983                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2984                                 continue;
2985
2986                         lq_sta->active_siso_rate |= BIT(i);
2987                 }
2988         }
2989
2990         if (sta->rx_nss < 2)
2991                 return;
2992
2993         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2994         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2995                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2996                         if (i == IWL_RATE_9M_INDEX)
2997                                 continue;
2998
2999                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
3000                         if (i == IWL_RATE_MCS_9_INDEX &&
3001                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
3002                                 continue;
3003
3004                         lq_sta->active_mimo2_rate |= BIT(i);
3005                 }
3006         }
3007 }
3008
3009 static void rs_ht_init(struct iwl_mvm *mvm,
3010                        struct ieee80211_sta *sta,
3011                        struct iwl_lq_sta *lq_sta,
3012                        struct ieee80211_sta_ht_cap *ht_cap)
3013 {
3014         /* active_siso_rate mask includes 9 MBits (bit 5),
3015          * and CCK (bits 0-3), supp_rates[] does not;
3016          * shift to convert format, force 9 MBits off.
3017          */
3018         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
3019         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
3020         lq_sta->active_siso_rate &= ~((u16)0x2);
3021         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
3022
3023         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
3024         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
3025         lq_sta->active_mimo2_rate &= ~((u16)0x2);
3026         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
3027
3028         if (mvm->cfg->ht_params->ldpc &&
3029             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
3030                 lq_sta->ldpc = true;
3031
3032         if (mvm->cfg->ht_params->stbc &&
3033             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3034             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3035                 lq_sta->stbc_capable = true;
3036
3037         lq_sta->is_vht = false;
3038 }
3039
3040 static void rs_vht_init(struct iwl_mvm *mvm,
3041                         struct ieee80211_sta *sta,
3042                         struct iwl_lq_sta *lq_sta,
3043                         struct ieee80211_sta_vht_cap *vht_cap)
3044 {
3045         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
3046
3047         if (mvm->cfg->ht_params->ldpc &&
3048             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3049                 lq_sta->ldpc = true;
3050
3051         if (mvm->cfg->ht_params->stbc &&
3052             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3053             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3054                 lq_sta->stbc_capable = true;
3055
3056         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3057             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3058             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3059                 lq_sta->bfer_capable = true;
3060
3061         lq_sta->is_vht = true;
3062 }
3063
3064 #ifdef CONFIG_IWLWIFI_DEBUGFS
3065 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3066 {
3067         spin_lock_bh(&mvm->drv_stats_lock);
3068         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3069         spin_unlock_bh(&mvm->drv_stats_lock);
3070 }
3071
3072 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3073 {
3074         u8 nss = 0, mcs = 0;
3075
3076         spin_lock(&mvm->drv_stats_lock);
3077
3078         if (agg)
3079                 mvm->drv_rx_stats.agg_frames++;
3080
3081         mvm->drv_rx_stats.success_frames++;
3082
3083         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3084         case RATE_MCS_CHAN_WIDTH_20:
3085                 mvm->drv_rx_stats.bw_20_frames++;
3086                 break;
3087         case RATE_MCS_CHAN_WIDTH_40:
3088                 mvm->drv_rx_stats.bw_40_frames++;
3089                 break;
3090         case RATE_MCS_CHAN_WIDTH_80:
3091                 mvm->drv_rx_stats.bw_80_frames++;
3092                 break;
3093         case RATE_MCS_CHAN_WIDTH_160:
3094                 mvm->drv_rx_stats.bw_160_frames++;
3095                 break;
3096         default:
3097                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3098         }
3099
3100         if (rate & RATE_MCS_HT_MSK) {
3101                 mvm->drv_rx_stats.ht_frames++;
3102                 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
3103                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3104         } else if (rate & RATE_MCS_VHT_MSK) {
3105                 mvm->drv_rx_stats.vht_frames++;
3106                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3107                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3108                        RATE_VHT_MCS_NSS_POS) + 1;
3109         } else {
3110                 mvm->drv_rx_stats.legacy_frames++;
3111         }
3112
3113         if (nss == 1)
3114                 mvm->drv_rx_stats.siso_frames++;
3115         else if (nss == 2)
3116                 mvm->drv_rx_stats.mimo2_frames++;
3117
3118         if (rate & RATE_MCS_SGI_MSK)
3119                 mvm->drv_rx_stats.sgi_frames++;
3120         else
3121                 mvm->drv_rx_stats.ngi_frames++;
3122
3123         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3124         mvm->drv_rx_stats.last_frame_idx =
3125                 (mvm->drv_rx_stats.last_frame_idx + 1) %
3126                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3127
3128         spin_unlock(&mvm->drv_stats_lock);
3129 }
3130 #endif
3131
3132 /*
3133  * Called after adding a new station to initialize rate scaling
3134  */
3135 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3136                           enum nl80211_band band, bool init)
3137 {
3138         int i, j;
3139         struct ieee80211_hw *hw = mvm->hw;
3140         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3141         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3142         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
3143         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
3144         struct ieee80211_supported_band *sband;
3145         unsigned long supp; /* must be unsigned long for for_each_set_bit */
3146
3147         /* clear all non-persistent lq data */
3148         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3149
3150         sband = hw->wiphy->bands[band];
3151
3152         lq_sta->lq.sta_id = sta_priv->sta_id;
3153         sta_priv->tlc_amsdu = false;
3154
3155         for (j = 0; j < LQ_SIZE; j++)
3156                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3157
3158         lq_sta->flush_timer = 0;
3159         lq_sta->last_tx = jiffies;
3160
3161         IWL_DEBUG_RATE(mvm,
3162                        "LQ: *** rate scale station global init for station %d ***\n",
3163                        sta_priv->sta_id);
3164         /* TODO: what is a good starting rate for STA? About middle? Maybe not
3165          * the lowest or the highest rate.. Could consider using RSSI from
3166          * previous packets? Need to have IEEE 802.1X auth succeed immediately
3167          * after assoc.. */
3168
3169         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3170         lq_sta->band = sband->band;
3171         /*
3172          * active legacy rates as per supported rates bitmap
3173          */
3174         supp = sta->supp_rates[sband->band];
3175         lq_sta->active_legacy_rate = 0;
3176         for_each_set_bit(i, &supp, BITS_PER_LONG)
3177                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3178
3179         /* TODO: should probably account for rx_highest for both HT/VHT */
3180         if (!vht_cap || !vht_cap->vht_supported)
3181                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3182         else
3183                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3184
3185         lq_sta->max_legacy_rate_idx =
3186                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3187         lq_sta->max_siso_rate_idx =
3188                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3189         lq_sta->max_mimo2_rate_idx =
3190                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3191
3192         IWL_DEBUG_RATE(mvm,
3193                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3194                        lq_sta->active_legacy_rate,
3195                        lq_sta->active_siso_rate,
3196                        lq_sta->active_mimo2_rate,
3197                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3198                        lq_sta->bfer_capable);
3199         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3200                        lq_sta->max_legacy_rate_idx,
3201                        lq_sta->max_siso_rate_idx,
3202                        lq_sta->max_mimo2_rate_idx);
3203
3204         /* These values will be overridden later */
3205         lq_sta->lq.single_stream_ant_msk =
3206                 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3207         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3208
3209         /* as default allow aggregation for all tids */
3210         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3211         lq_sta->is_agg = 0;
3212 #ifdef CONFIG_IWLWIFI_DEBUGFS
3213         iwl_mvm_reset_frame_stats(mvm);
3214 #endif
3215         rs_initialize_lq(mvm, sta, lq_sta, band, init);
3216 }
3217
3218 static void rs_rate_update(void *mvm_r,
3219                            struct ieee80211_supported_band *sband,
3220                            struct cfg80211_chan_def *chandef,
3221                            struct ieee80211_sta *sta, void *priv_sta,
3222                            u32 changed)
3223 {
3224         u8 tid;
3225         struct iwl_op_mode *op_mode  =
3226                         (struct iwl_op_mode *)mvm_r;
3227         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3228
3229         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3230                 return;
3231
3232         /* Stop any ongoing aggregations as rs starts off assuming no agg */
3233         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3234                 ieee80211_stop_tx_ba_session(sta, tid);
3235
3236         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3237 }
3238
3239 #ifdef CONFIG_MAC80211_DEBUGFS
3240 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3241                                             struct iwl_lq_cmd *lq_cmd,
3242                                             enum nl80211_band band,
3243                                             u32 ucode_rate)
3244 {
3245         struct rs_rate rate;
3246         int i;
3247         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3248         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3249         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3250
3251         for (i = 0; i < num_rates; i++)
3252                 lq_cmd->rs_table[i] = ucode_rate_le32;
3253
3254         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
3255
3256         if (is_mimo(&rate))
3257                 lq_cmd->mimo_delim = num_rates - 1;
3258         else
3259                 lq_cmd->mimo_delim = 0;
3260
3261         lq_cmd->reduced_tpc = 0;
3262
3263         if (num_of_ant(ant) == 1)
3264                 lq_cmd->single_stream_ant_msk = ant;
3265
3266         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3267 }
3268 #endif /* CONFIG_MAC80211_DEBUGFS */
3269
3270 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3271                                      struct iwl_lq_sta *lq_sta,
3272                                      struct rs_rate *rate,
3273                                      __le32 *rs_table, int *rs_table_index,
3274                                      int num_rates, int num_retries,
3275                                      u8 valid_tx_ant, bool toggle_ant)
3276 {
3277         int i, j;
3278         __le32 ucode_rate;
3279         bool bottom_reached = false;
3280         int prev_rate_idx = rate->index;
3281         int end = LINK_QUAL_MAX_RETRY_NUM;
3282         int index = *rs_table_index;
3283
3284         for (i = 0; i < num_rates && index < end; i++) {
3285                 for (j = 0; j < num_retries && index < end; j++, index++) {
3286                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3287                                                                          rate));
3288                         rs_table[index] = ucode_rate;
3289                         if (toggle_ant)
3290                                 rs_toggle_antenna(valid_tx_ant, rate);
3291                 }
3292
3293                 prev_rate_idx = rate->index;
3294                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3295                 if (bottom_reached && !is_legacy(rate))
3296                         break;
3297         }
3298
3299         if (!bottom_reached && !is_legacy(rate))
3300                 rate->index = prev_rate_idx;
3301
3302         *rs_table_index = index;
3303 }
3304
3305 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3306  * column the rate table should look like this:
3307  *
3308  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3309  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3310  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3311  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3312  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3313  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3314  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3315  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3316  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3317  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3318  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3319  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3320  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3321  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3322  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3323  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3324  */
3325 static void rs_build_rates_table(struct iwl_mvm *mvm,
3326                                  struct ieee80211_sta *sta,
3327                                  struct iwl_lq_sta *lq_sta,
3328                                  const struct rs_rate *initial_rate)
3329 {
3330         struct rs_rate rate;
3331         int num_rates, num_retries, index = 0;
3332         u8 valid_tx_ant = 0;
3333         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3334         bool toggle_ant = false;
3335
3336         memcpy(&rate, initial_rate, sizeof(rate));
3337
3338         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3339
3340         /* TODO: remove old API when min FW API hits 14 */
3341         if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3342             rs_stbc_allow(mvm, sta, lq_sta))
3343                 rate.stbc = true;
3344
3345         if (is_siso(&rate)) {
3346                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3347                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3348         } else if (is_mimo(&rate)) {
3349                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3350                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3351         } else {
3352                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3353                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3354                 toggle_ant = true;
3355         }
3356
3357         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3358                                  num_rates, num_retries, valid_tx_ant,
3359                                  toggle_ant);
3360
3361         rs_get_lower_rate_down_column(lq_sta, &rate);
3362
3363         if (is_siso(&rate)) {
3364                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3365                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3366                 lq_cmd->mimo_delim = index;
3367         } else if (is_legacy(&rate)) {
3368                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3369                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3370         } else {
3371                 WARN_ON_ONCE(1);
3372         }
3373
3374         toggle_ant = true;
3375
3376         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3377                                  num_rates, num_retries, valid_tx_ant,
3378                                  toggle_ant);
3379
3380         rs_get_lower_rate_down_column(lq_sta, &rate);
3381
3382         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3383         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3384
3385         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3386                                  num_rates, num_retries, valid_tx_ant,
3387                                  toggle_ant);
3388
3389 }
3390
3391 struct rs_bfer_active_iter_data {
3392         struct ieee80211_sta *exclude_sta;
3393         struct iwl_mvm_sta *bfer_mvmsta;
3394 };
3395
3396 static void rs_bfer_active_iter(void *_data,
3397                                 struct ieee80211_sta *sta)
3398 {
3399         struct rs_bfer_active_iter_data *data = _data;
3400         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3401         struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3402         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3403
3404         if (sta == data->exclude_sta)
3405                 return;
3406
3407         /* The current sta has BFER allowed */
3408         if (ss_params & LQ_SS_BFER_ALLOWED) {
3409                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3410
3411                 data->bfer_mvmsta = mvmsta;
3412         }
3413 }
3414
3415 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3416 {
3417         int prio = -1;
3418         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3419
3420         switch (viftype) {
3421         case NL80211_IFTYPE_AP:
3422         case NL80211_IFTYPE_P2P_GO:
3423                 prio = 3;
3424                 break;
3425         case NL80211_IFTYPE_P2P_CLIENT:
3426                 prio = 2;
3427                 break;
3428         case NL80211_IFTYPE_STATION:
3429                 prio = 1;
3430                 break;
3431         default:
3432                 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3433                 prio = -1;
3434         }
3435
3436         return prio;
3437 }
3438
3439 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3440 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3441                                 struct iwl_mvm_sta *sta2)
3442 {
3443         int prio1 = rs_bfer_priority(sta1);
3444         int prio2 = rs_bfer_priority(sta2);
3445
3446         if (prio1 > prio2)
3447                 return 1;
3448         if (prio1 < prio2)
3449                 return -1;
3450         return 0;
3451 }
3452
3453 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3454                                 struct ieee80211_sta *sta,
3455                                 struct iwl_lq_sta *lq_sta,
3456                                 const struct rs_rate *initial_rate)
3457 {
3458         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3459         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3460         struct rs_bfer_active_iter_data data = {
3461                 .exclude_sta = sta,
3462                 .bfer_mvmsta = NULL,
3463         };
3464         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3465         u32 ss_params = LQ_SS_PARAMS_VALID;
3466
3467         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3468                 goto out;
3469
3470 #ifdef CONFIG_MAC80211_DEBUGFS
3471         /* Check if forcing the decision is configured.
3472          * Note that SISO is forced by not allowing STBC or BFER
3473          */
3474         if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3475                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3476         else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3477                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3478
3479         if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3480                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3481                                lq_sta->pers.ss_force);
3482                 goto out;
3483         }
3484 #endif
3485
3486         if (lq_sta->stbc_capable)
3487                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3488
3489         if (!lq_sta->bfer_capable)
3490                 goto out;
3491
3492         ieee80211_iterate_stations_atomic(mvm->hw,
3493                                           rs_bfer_active_iter,
3494                                           &data);
3495         bfer_mvmsta = data.bfer_mvmsta;
3496
3497         /* This code is safe as it doesn't run concurrently for different
3498          * stations. This is guaranteed by the fact that calls to
3499          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3500          */
3501         if (!bfer_mvmsta) {
3502                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3503
3504                 ss_params |= LQ_SS_BFER_ALLOWED;
3505                 goto out;
3506         }
3507
3508         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3509                        bfer_mvmsta->sta_id);
3510
3511         /* Disallow BFER on another STA if active and we're a higher priority */
3512         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3513                 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3514                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3515
3516                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3517                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3518                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3519
3520                 ss_params |= LQ_SS_BFER_ALLOWED;
3521                 IWL_DEBUG_RATE(mvm,
3522                                "Lower priority BFER sta found (%d). Switch BFER\n",
3523                                bfer_mvmsta->sta_id);
3524         }
3525 out:
3526         lq_cmd->ss_params = cpu_to_le32(ss_params);
3527 }
3528
3529 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3530                            struct ieee80211_sta *sta,
3531                            struct iwl_lq_sta *lq_sta,
3532                            const struct rs_rate *initial_rate)
3533 {
3534         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3535         struct iwl_mvm_sta *mvmsta;
3536         struct iwl_mvm_vif *mvmvif;
3537
3538         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3539         lq_cmd->agg_time_limit =
3540                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3541
3542 #ifdef CONFIG_MAC80211_DEBUGFS
3543         if (lq_sta->pers.dbg_fixed_rate) {
3544                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3545                                                 lq_sta->band,
3546                                                 lq_sta->pers.dbg_fixed_rate);
3547                 return;
3548         }
3549 #endif
3550         if (WARN_ON_ONCE(!sta || !initial_rate))
3551                 return;
3552
3553         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3554
3555         if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3556                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3557
3558         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3559         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3560
3561         if (num_of_ant(initial_rate->ant) == 1)
3562                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3563
3564         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3565
3566         /*
3567          * In case of low latency, tell the firmware to leave a frame in the
3568          * Tx Fifo so that it can start a transaction in the same TxOP. This
3569          * basically allows the firmware to send bursts.
3570          */
3571         if (iwl_mvm_vif_low_latency(mvmvif))
3572                 lq_cmd->agg_frame_cnt_limit--;
3573
3574         if (mvmsta->vif->p2p)
3575                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3576
3577         lq_cmd->agg_time_limit =
3578                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3579 }
3580
3581 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3582 {
3583         return hw->priv;
3584 }
3585 /* rate scale requires free function to be implemented */
3586 static void rs_free(void *mvm_rate)
3587 {
3588         return;
3589 }
3590
3591 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3592                         void *mvm_sta)
3593 {
3594         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3595         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3596
3597         IWL_DEBUG_RATE(mvm, "enter\n");
3598         IWL_DEBUG_RATE(mvm, "leave\n");
3599 }
3600
3601 #ifdef CONFIG_MAC80211_DEBUGFS
3602 int rs_pretty_print_rate(char *buf, const u32 rate)
3603 {
3604
3605         char *type, *bw;
3606         u8 mcs = 0, nss = 0;
3607         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3608
3609         if (!(rate & RATE_MCS_HT_MSK) &&
3610             !(rate & RATE_MCS_VHT_MSK)) {
3611                 int index = iwl_hwrate_to_plcp_idx(rate);
3612
3613                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3614                                rs_pretty_ant(ant),
3615                                index == IWL_RATE_INVALID ? "BAD" :
3616                                iwl_rate_mcs[index].mbps);
3617         }
3618
3619         if (rate & RATE_MCS_VHT_MSK) {
3620                 type = "VHT";
3621                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3622                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3623                        >> RATE_VHT_MCS_NSS_POS) + 1;
3624         } else if (rate & RATE_MCS_HT_MSK) {
3625                 type = "HT";
3626                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3627         } else {
3628                 type = "Unknown"; /* shouldn't happen */
3629         }
3630
3631         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3632         case RATE_MCS_CHAN_WIDTH_20:
3633                 bw = "20Mhz";
3634                 break;
3635         case RATE_MCS_CHAN_WIDTH_40:
3636                 bw = "40Mhz";
3637                 break;
3638         case RATE_MCS_CHAN_WIDTH_80:
3639                 bw = "80Mhz";
3640                 break;
3641         case RATE_MCS_CHAN_WIDTH_160:
3642                 bw = "160Mhz";
3643                 break;
3644         default:
3645                 bw = "BAD BW";
3646         }
3647
3648         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3649                        type, rs_pretty_ant(ant), bw, mcs, nss,
3650                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3651                        (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3652                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3653                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3654                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3655 }
3656
3657 /**
3658  * Program the device to use fixed rate for frame transmit
3659  * This is for debugging/testing only
3660  * once the device start use fixed rate, we need to reload the module
3661  * to being back the normal operation.
3662  */
3663 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3664                                 struct iwl_lq_sta *lq_sta)
3665 {
3666         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3667         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3668         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3669
3670         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3671                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3672
3673         if (lq_sta->pers.dbg_fixed_rate) {
3674                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3675                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3676         }
3677 }
3678
3679 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3680                         const char __user *user_buf, size_t count, loff_t *ppos)
3681 {
3682         struct iwl_lq_sta *lq_sta = file->private_data;
3683         struct iwl_mvm *mvm;
3684         char buf[64];
3685         size_t buf_size;
3686         u32 parsed_rate;
3687
3688         mvm = lq_sta->pers.drv;
3689         memset(buf, 0, sizeof(buf));
3690         buf_size = min(count, sizeof(buf) -  1);
3691         if (copy_from_user(buf, user_buf, buf_size))
3692                 return -EFAULT;
3693
3694         if (sscanf(buf, "%x", &parsed_rate) == 1)
3695                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3696         else
3697                 lq_sta->pers.dbg_fixed_rate = 0;
3698
3699         rs_program_fix_rate(mvm, lq_sta);
3700
3701         return count;
3702 }
3703
3704 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3705                         char __user *user_buf, size_t count, loff_t *ppos)
3706 {
3707         char *buff;
3708         int desc = 0;
3709         int i = 0;
3710         ssize_t ret;
3711
3712         struct iwl_lq_sta *lq_sta = file->private_data;
3713         struct iwl_mvm_sta *mvmsta =
3714                 container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3715         struct iwl_mvm *mvm;
3716         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3717         struct rs_rate *rate = &tbl->rate;
3718         u32 ss_params;
3719
3720         mvm = lq_sta->pers.drv;
3721         buff = kmalloc(2048, GFP_KERNEL);
3722         if (!buff)
3723                 return -ENOMEM;
3724
3725         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3726         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3727                         lq_sta->total_failed, lq_sta->total_success,
3728                         lq_sta->active_legacy_rate);
3729         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3730                         lq_sta->pers.dbg_fixed_rate);
3731         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3732             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3733             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3734             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3735         desc += sprintf(buff+desc, "lq type %s\n",
3736                         (is_legacy(rate)) ? "legacy" :
3737                         is_vht(rate) ? "VHT" : "HT");
3738         if (!is_legacy(rate)) {
3739                 desc += sprintf(buff + desc, " %s",
3740                    (is_siso(rate)) ? "SISO" : "MIMO2");
3741                 desc += sprintf(buff + desc, " %s",
3742                                 (is_ht20(rate)) ? "20MHz" :
3743                                 (is_ht40(rate)) ? "40MHz" :
3744                                 (is_ht80(rate)) ? "80MHz" :
3745                                 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3746                 desc += sprintf(buff + desc, " %s %s %s %s\n",
3747                                 (rate->sgi) ? "SGI" : "NGI",
3748                                 (rate->ldpc) ? "LDPC" : "BCC",
3749                                 (lq_sta->is_agg) ? "AGG on" : "",
3750                                 (mvmsta->tlc_amsdu) ? "AMSDU on" : "");
3751         }
3752         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3753                         lq_sta->last_rate_n_flags);
3754         desc += sprintf(buff+desc,
3755                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3756                         lq_sta->lq.flags,
3757                         lq_sta->lq.mimo_delim,
3758                         lq_sta->lq.single_stream_ant_msk,
3759                         lq_sta->lq.dual_stream_ant_msk);
3760
3761         desc += sprintf(buff+desc,
3762                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3763                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3764                         lq_sta->lq.agg_disable_start_th,
3765                         lq_sta->lq.agg_frame_cnt_limit);
3766
3767         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3768         ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3769         desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3770                         (ss_params & LQ_SS_PARAMS_VALID) ?
3771                         "VALID" : "INVALID",
3772                         (ss_params & LQ_SS_BFER_ALLOWED) ?
3773                         ", BFER" : "",
3774                         (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3775                         ", STBC" : "",
3776                         (ss_params & LQ_SS_FORCE) ?
3777                         ", FORCE" : "");
3778         desc += sprintf(buff+desc,
3779                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3780                         lq_sta->lq.initial_rate_index[0],
3781                         lq_sta->lq.initial_rate_index[1],
3782                         lq_sta->lq.initial_rate_index[2],
3783                         lq_sta->lq.initial_rate_index[3]);
3784
3785         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3786                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3787
3788                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3789                 desc += rs_pretty_print_rate(buff+desc, r);
3790         }
3791
3792         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3793         kfree(buff);
3794         return ret;
3795 }
3796
3797 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3798         .write = rs_sta_dbgfs_scale_table_write,
3799         .read = rs_sta_dbgfs_scale_table_read,
3800         .open = simple_open,
3801         .llseek = default_llseek,
3802 };
3803 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3804                         char __user *user_buf, size_t count, loff_t *ppos)
3805 {
3806         char *buff;
3807         int desc = 0;
3808         int i, j;
3809         ssize_t ret;
3810         struct iwl_scale_tbl_info *tbl;
3811         struct rs_rate *rate;
3812         struct iwl_lq_sta *lq_sta = file->private_data;
3813
3814         buff = kmalloc(1024, GFP_KERNEL);
3815         if (!buff)
3816                 return -ENOMEM;
3817
3818         for (i = 0; i < LQ_SIZE; i++) {
3819                 tbl = &(lq_sta->lq_info[i]);
3820                 rate = &tbl->rate;
3821                 desc += sprintf(buff+desc,
3822                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3823                                 "index=%d\n",
3824                                 lq_sta->active_tbl == i ? "*" : "x",
3825                                 rate->type,
3826                                 rate->sgi,
3827                                 is_ht20(rate) ? "20MHz" :
3828                                 is_ht40(rate) ? "40MHz" :
3829                                 is_ht80(rate) ? "80MHz" :
3830                                 is_ht160(rate) ? "160MHz" : "ERR",
3831                                 rate->index);
3832                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3833                         desc += sprintf(buff+desc,
3834                                 "counter=%d success=%d %%=%d\n",
3835                                 tbl->win[j].counter,
3836                                 tbl->win[j].success_counter,
3837                                 tbl->win[j].success_ratio);
3838                 }
3839         }
3840         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3841         kfree(buff);
3842         return ret;
3843 }
3844
3845 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3846         .read = rs_sta_dbgfs_stats_table_read,
3847         .open = simple_open,
3848         .llseek = default_llseek,
3849 };
3850
3851 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3852                                               char __user *user_buf,
3853                                               size_t count, loff_t *ppos)
3854 {
3855         static const char * const column_name[] = {
3856                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3857                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3858                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3859                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3860                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3861                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3862                 [RS_COLUMN_MIMO2] = "MIMO2",
3863                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3864         };
3865
3866         static const char * const rate_name[] = {
3867                 [IWL_RATE_1M_INDEX] = "1M",
3868                 [IWL_RATE_2M_INDEX] = "2M",
3869                 [IWL_RATE_5M_INDEX] = "5.5M",
3870                 [IWL_RATE_11M_INDEX] = "11M",
3871                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3872                 [IWL_RATE_9M_INDEX] = "9M",
3873                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3874                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3875                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3876                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3877                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3878                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3879                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3880                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3881                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3882         };
3883
3884         char *buff, *pos, *endpos;
3885         int col, rate;
3886         ssize_t ret;
3887         struct iwl_lq_sta *lq_sta = file->private_data;
3888         struct rs_rate_stats *stats;
3889         static const size_t bufsz = 1024;
3890
3891         buff = kmalloc(bufsz, GFP_KERNEL);
3892         if (!buff)
3893                 return -ENOMEM;
3894
3895         pos = buff;
3896         endpos = pos + bufsz;
3897
3898         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3899         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3900                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3901         pos += scnprintf(pos, endpos - pos, "\n");
3902
3903         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3904                 pos += scnprintf(pos, endpos - pos,
3905                                  "%s,", column_name[col]);
3906
3907                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3908                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3909                         pos += scnprintf(pos, endpos - pos,
3910                                          "%llu/%llu,",
3911                                          stats->success,
3912                                          stats->total);
3913                 }
3914                 pos += scnprintf(pos, endpos - pos, "\n");
3915         }
3916
3917         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3918         kfree(buff);
3919         return ret;
3920 }
3921
3922 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3923                                                const char __user *user_buf,
3924                                                size_t count, loff_t *ppos)
3925 {
3926         struct iwl_lq_sta *lq_sta = file->private_data;
3927         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3928
3929         return count;
3930 }
3931
3932 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3933         .read = rs_sta_dbgfs_drv_tx_stats_read,
3934         .write = rs_sta_dbgfs_drv_tx_stats_write,
3935         .open = simple_open,
3936         .llseek = default_llseek,
3937 };
3938
3939 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3940                                        char __user *user_buf,
3941                                        size_t count, loff_t *ppos)
3942 {
3943         struct iwl_lq_sta *lq_sta = file->private_data;
3944         char buf[12];
3945         int bufsz = sizeof(buf);
3946         int pos = 0;
3947         static const char * const ss_force_name[] = {
3948                 [RS_SS_FORCE_NONE] = "none",
3949                 [RS_SS_FORCE_STBC] = "stbc",
3950                 [RS_SS_FORCE_BFER] = "bfer",
3951                 [RS_SS_FORCE_SISO] = "siso",
3952         };
3953
3954         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3955                          ss_force_name[lq_sta->pers.ss_force]);
3956         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3957 }
3958
3959 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3960                                         size_t count, loff_t *ppos)
3961 {
3962         struct iwl_mvm *mvm = lq_sta->pers.drv;
3963         int ret = 0;
3964
3965         if (!strncmp("none", buf, 4)) {
3966                 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3967         } else if (!strncmp("siso", buf, 4)) {
3968                 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3969         } else if (!strncmp("stbc", buf, 4)) {
3970                 if (lq_sta->stbc_capable) {
3971                         lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3972                 } else {
3973                         IWL_ERR(mvm,
3974                                 "can't force STBC. peer doesn't support\n");
3975                         ret = -EINVAL;
3976                 }
3977         } else if (!strncmp("bfer", buf, 4)) {
3978                 if (lq_sta->bfer_capable) {
3979                         lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3980                 } else {
3981                         IWL_ERR(mvm,
3982                                 "can't force BFER. peer doesn't support\n");
3983                         ret = -EINVAL;
3984                 }
3985         } else {
3986                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3987                 ret = -EINVAL;
3988         }
3989         return ret ?: count;
3990 }
3991
3992 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3993         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3994 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
3995                 if (!debugfs_create_file(#name, mode, parent, lq_sta,   \
3996                                          &iwl_dbgfs_##name##_ops))      \
3997                         goto err;                                       \
3998         } while (0)
3999
4000 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4001
4002 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
4003 {
4004         struct iwl_lq_sta *lq_sta = priv_sta;
4005         struct iwl_mvm_sta *mvmsta;
4006
4007         mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
4008
4009         if (!mvmsta->vif)
4010                 return;
4011
4012         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
4013                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
4014         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
4015                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
4016         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
4017                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4018         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
4019                           &lq_sta->tx_agg_tid_en);
4020         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
4021                           &lq_sta->pers.dbg_fixed_txp_reduction);
4022
4023         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
4024         return;
4025 err:
4026         IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
4027 }
4028
4029 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
4030 {
4031 }
4032 #endif
4033
4034 /*
4035  * Initialization of rate scaling information is done by driver after
4036  * the station is added. Since mac80211 calls this function before a
4037  * station is added we ignore it.
4038  */
4039 static void rs_rate_init_stub(void *mvm_r,
4040                               struct ieee80211_supported_band *sband,
4041                               struct cfg80211_chan_def *chandef,
4042                               struct ieee80211_sta *sta, void *mvm_sta)
4043 {
4044 }
4045
4046 static const struct rate_control_ops rs_mvm_ops = {
4047         .name = RS_NAME,
4048         .tx_status = rs_mac80211_tx_status,
4049         .get_rate = rs_get_rate,
4050         .rate_init = rs_rate_init_stub,
4051         .alloc = rs_alloc,
4052         .free = rs_free,
4053         .alloc_sta = rs_alloc_sta,
4054         .free_sta = rs_free_sta,
4055         .rate_update = rs_rate_update,
4056 #ifdef CONFIG_MAC80211_DEBUGFS
4057         .add_sta_debugfs = rs_add_debugfs,
4058         .remove_sta_debugfs = rs_remove_debugfs,
4059 #endif
4060 };
4061
4062 int iwl_mvm_rate_control_register(void)
4063 {
4064         return ieee80211_rate_control_register(&rs_mvm_ops);
4065 }
4066
4067 void iwl_mvm_rate_control_unregister(void)
4068 {
4069         ieee80211_rate_control_unregister(&rs_mvm_ops);
4070 }
4071
4072 /**
4073  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
4074  * Tx protection, according to this request and previous requests,
4075  * and send the LQ command.
4076  * @mvmsta: The station
4077  * @enable: Enable Tx protection?
4078  */
4079 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4080                           bool enable)
4081 {
4082         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
4083
4084         lockdep_assert_held(&mvm->mutex);
4085
4086         if (enable) {
4087                 if (mvmsta->tx_protection == 0)
4088                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
4089                 mvmsta->tx_protection++;
4090         } else {
4091                 mvmsta->tx_protection--;
4092                 if (mvmsta->tx_protection == 0)
4093                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4094         }
4095
4096         return iwl_mvm_send_lq_cmd(mvm, lq, false);
4097 }