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         if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
1211                                     &tx_resp_rate)) {
1212                 WARN_ON_ONCE(1);
1213                 return;
1214         }
1215
1216 #ifdef CONFIG_MAC80211_DEBUGFS
1217         /* Disable last tx check if we are debugging with fixed rate but
1218          * update tx stats */
1219         if (lq_sta->pers.dbg_fixed_rate) {
1220                 int index = tx_resp_rate.index;
1221                 enum rs_column column;
1222                 int attempts, success;
1223
1224                 column = rs_get_column_from_rate(&tx_resp_rate);
1225                 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1226                               "Can't map rate 0x%x to column",
1227                               tx_resp_hwrate))
1228                         return;
1229
1230                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1231                         attempts = info->status.ampdu_len;
1232                         success = info->status.ampdu_ack_len;
1233                 } else {
1234                         attempts = info->status.rates[0].count;
1235                         success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1236                 }
1237
1238                 lq_sta->pers.tx_stats[column][index].total += attempts;
1239                 lq_sta->pers.tx_stats[column][index].success += success;
1240
1241                 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1242                                tx_resp_hwrate, success, attempts);
1243                 return;
1244         }
1245 #endif
1246
1247         if (time_after(jiffies,
1248                        (unsigned long)(lq_sta->last_tx +
1249                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1250                 int t;
1251
1252                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1253                 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1254                         ieee80211_stop_tx_ba_session(sta, t);
1255
1256                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1257                 return;
1258         }
1259         lq_sta->last_tx = jiffies;
1260
1261         /* Ignore this Tx frame response if its initial rate doesn't match
1262          * that of latest Link Quality command.  There may be stragglers
1263          * from a previous Link Quality command, but we're no longer interested
1264          * in those; they're either from the "active" mode while we're trying
1265          * to check "search" mode, or a prior "search" mode after we've moved
1266          * to a new "search" mode (which might become the new "active" mode).
1267          */
1268         table = &lq_sta->lq;
1269         lq_hwrate = le32_to_cpu(table->rs_table[0]);
1270         if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
1271                 WARN_ON_ONCE(1);
1272                 return;
1273         }
1274
1275         /* Here we actually compare this rate to the latest LQ command */
1276         if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1277                 IWL_DEBUG_RATE(mvm,
1278                                "initial tx resp rate 0x%x does not match 0x%x\n",
1279                                tx_resp_hwrate, lq_hwrate);
1280
1281                 /*
1282                  * Since rates mis-match, the last LQ command may have failed.
1283                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1284                  * ... driver.
1285                  */
1286                 lq_sta->missed_rate_counter++;
1287                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1288                         lq_sta->missed_rate_counter = 0;
1289                         IWL_DEBUG_RATE(mvm,
1290                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1291                                        lq_sta->rs_state);
1292                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1293                 }
1294                 /* Regardless, ignore this status info for outdated rate */
1295                 return;
1296         } else
1297                 /* Rate did match, so reset the missed_rate_counter */
1298                 lq_sta->missed_rate_counter = 0;
1299
1300         if (!lq_sta->search_better_tbl) {
1301                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1302                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1303         } else {
1304                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1305                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1306         }
1307
1308         if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1309                 IWL_DEBUG_RATE(mvm,
1310                                "Neither active nor search matches tx rate\n");
1311                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1312                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1313                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1314                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1315                 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1316
1317                 /*
1318                  * no matching table found, let's by-pass the data collection
1319                  * and continue to perform rate scale to find the rate table
1320                  */
1321                 rs_stay_in_table(lq_sta, true);
1322                 goto done;
1323         }
1324
1325         /*
1326          * Updating the frame history depends on whether packets were
1327          * aggregated.
1328          *
1329          * For aggregation, all packets were transmitted at the same rate, the
1330          * first index into rate scale table.
1331          */
1332         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1333                 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1334                                     info->status.ampdu_len,
1335                                     info->status.ampdu_ack_len,
1336                                     reduced_txp);
1337
1338                 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1339                  * it as a single frame loss as we don't want the success ratio
1340                  * to dip too quickly because a BA wasn't received.
1341                  * For TPC, there's no need for this optimisation since we want
1342                  * to recover very quickly from a bad power reduction and,
1343                  * therefore we'd like the success ratio to get an immediate hit
1344                  * when failing to get a BA, so we'd switch back to a lower or
1345                  * zero power reduction. When FW transmits agg with a rate
1346                  * different from the initial rate, it will not use reduced txp
1347                  * and will send BA notification twice (one empty with reduced
1348                  * txp equal to the value from LQ and one with reduced txp 0).
1349                  * We need to update counters for each txp level accordingly.
1350                  */
1351                 if (info->status.ampdu_ack_len == 0)
1352                         info->status.ampdu_len = 1;
1353
1354                 rs_collect_tlc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1355                                     info->status.ampdu_len,
1356                                     info->status.ampdu_ack_len);
1357
1358                 /* Update success/fail counts if not searching for new mode */
1359                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1360                         lq_sta->total_success += info->status.ampdu_ack_len;
1361                         lq_sta->total_failed += (info->status.ampdu_len -
1362                                         info->status.ampdu_ack_len);
1363                 }
1364         } else {
1365                 /* For legacy, update frame history with for each Tx retry. */
1366                 retries = info->status.rates[0].count - 1;
1367                 /* HW doesn't send more than 15 retries */
1368                 retries = min(retries, 15);
1369
1370                 /* The last transmission may have been successful */
1371                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1372                 /* Collect data for each rate used during failed TX attempts */
1373                 for (i = 0; i <= retries; ++i) {
1374                         lq_hwrate = le32_to_cpu(table->rs_table[i]);
1375                         if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
1376                                                     &lq_rate)) {
1377                                 WARN_ON_ONCE(1);
1378                                 return;
1379                         }
1380
1381                         /*
1382                          * Only collect stats if retried rate is in the same RS
1383                          * table as active/search.
1384                          */
1385                         if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1386                                 tmp_tbl = curr_tbl;
1387                         else if (rs_rate_column_match(&lq_rate,
1388                                                       &other_tbl->rate))
1389                                 tmp_tbl = other_tbl;
1390                         else
1391                                 continue;
1392
1393                         rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1394                                             lq_rate.index, 1,
1395                                             i < retries ? 0 : legacy_success,
1396                                             reduced_txp);
1397                         rs_collect_tlc_data(mvm, lq_sta, tmp_tbl,
1398                                             lq_rate.index, 1,
1399                                             i < retries ? 0 : legacy_success);
1400                 }
1401
1402                 /* Update success/fail counts if not searching for new mode */
1403                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1404                         lq_sta->total_success += legacy_success;
1405                         lq_sta->total_failed += retries + (1 - legacy_success);
1406                 }
1407         }
1408         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1409         lq_sta->last_rate_n_flags = lq_hwrate;
1410         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1411 done:
1412         /* See if there's a better rate or modulation mode to try. */
1413         if (sta->supp_rates[info->band])
1414                 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
1415 }
1416
1417 /*
1418  * mac80211 sends us Tx status
1419  */
1420 static void rs_mac80211_tx_status(void *mvm_r,
1421                                   struct ieee80211_supported_band *sband,
1422                                   struct ieee80211_sta *sta, void *priv_sta,
1423                                   struct sk_buff *skb)
1424 {
1425         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1426         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1427         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1428         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1429
1430         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1431                 return;
1432
1433         if (!ieee80211_is_data(hdr->frame_control) ||
1434             info->flags & IEEE80211_TX_CTL_NO_ACK)
1435                 return;
1436
1437         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1438                              ieee80211_is_qos_nullfunc(hdr->frame_control));
1439 }
1440
1441 /*
1442  * Begin a period of staying with a selected modulation mode.
1443  * Set "stay_in_tbl" flag to prevent any mode switches.
1444  * Set frame tx success limits according to legacy vs. high-throughput,
1445  * and reset overall (spanning all rates) tx success history statistics.
1446  * These control how long we stay using same modulation mode before
1447  * searching for a new mode.
1448  */
1449 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1450                                  struct iwl_lq_sta *lq_sta)
1451 {
1452         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1453         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1454         if (is_legacy) {
1455                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1456                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1457                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1458         } else {
1459                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1460                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1461                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1462         }
1463         lq_sta->table_count = 0;
1464         lq_sta->total_failed = 0;
1465         lq_sta->total_success = 0;
1466         lq_sta->flush_timer = jiffies;
1467         lq_sta->visited_columns = 0;
1468 }
1469
1470 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1471 {
1472         if (rate_mask)
1473                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1474         return IWL_RATE_INVALID;
1475 }
1476
1477 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1478                                    const struct rs_tx_column *column)
1479 {
1480         switch (column->mode) {
1481         case RS_LEGACY:
1482                 return lq_sta->max_legacy_rate_idx;
1483         case RS_SISO:
1484                 return lq_sta->max_siso_rate_idx;
1485         case RS_MIMO2:
1486                 return lq_sta->max_mimo2_rate_idx;
1487         default:
1488                 WARN_ON_ONCE(1);
1489         }
1490
1491         return lq_sta->max_legacy_rate_idx;
1492 }
1493
1494 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1495                                             const struct rs_tx_column *column,
1496                                             u32 bw)
1497 {
1498         /* Used to choose among HT tables */
1499         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1500
1501         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1502                          column->mode != RS_SISO &&
1503                          column->mode != RS_MIMO2))
1504                 return expected_tpt_legacy;
1505
1506         /* Legacy rates have only one table */
1507         if (column->mode == RS_LEGACY)
1508                 return expected_tpt_legacy;
1509
1510         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1511         /* Choose among many HT tables depending on number of streams
1512          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1513          * status */
1514         if (column->mode == RS_SISO) {
1515                 switch (bw) {
1516                 case RATE_MCS_CHAN_WIDTH_20:
1517                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1518                         break;
1519                 case RATE_MCS_CHAN_WIDTH_40:
1520                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1521                         break;
1522                 case RATE_MCS_CHAN_WIDTH_80:
1523                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1524                         break;
1525                 case RATE_MCS_CHAN_WIDTH_160:
1526                         ht_tbl_pointer = expected_tpt_siso_160MHz;
1527                         break;
1528                 default:
1529                         WARN_ON_ONCE(1);
1530                 }
1531         } else if (column->mode == RS_MIMO2) {
1532                 switch (bw) {
1533                 case RATE_MCS_CHAN_WIDTH_20:
1534                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1535                         break;
1536                 case RATE_MCS_CHAN_WIDTH_40:
1537                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1538                         break;
1539                 case RATE_MCS_CHAN_WIDTH_80:
1540                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1541                         break;
1542                 case RATE_MCS_CHAN_WIDTH_160:
1543                         ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1544                         break;
1545                 default:
1546                         WARN_ON_ONCE(1);
1547                 }
1548         } else {
1549                 WARN_ON_ONCE(1);
1550         }
1551
1552         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1553                 return ht_tbl_pointer[0];
1554         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1555                 return ht_tbl_pointer[1];
1556         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1557                 return ht_tbl_pointer[2];
1558         else                                            /* AGG+SGI */
1559                 return ht_tbl_pointer[3];
1560 }
1561
1562 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1563                                       struct iwl_scale_tbl_info *tbl)
1564 {
1565         struct rs_rate *rate = &tbl->rate;
1566         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1567
1568         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1569 }
1570
1571 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1572                             struct iwl_lq_sta *lq_sta,
1573                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1574                             unsigned long rate_mask, s8 index)
1575 {
1576         struct iwl_scale_tbl_info *active_tbl =
1577             &(lq_sta->lq_info[lq_sta->active_tbl]);
1578         s32 success_ratio = active_tbl->win[index].success_ratio;
1579         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1580         const u16 *tpt_tbl = tbl->expected_tpt;
1581         u16 high_low;
1582         u32 target_tpt;
1583         int rate_idx;
1584
1585         if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1586                 target_tpt = 100 * expected_current_tpt;
1587                 IWL_DEBUG_RATE(mvm,
1588                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1589                                success_ratio, target_tpt);
1590         } else {
1591                 target_tpt = lq_sta->last_tpt;
1592                 IWL_DEBUG_RATE(mvm,
1593                                "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1594                                success_ratio, target_tpt);
1595         }
1596
1597         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1598
1599         while (rate_idx != IWL_RATE_INVALID) {
1600                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1601                         break;
1602
1603                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1604                                                 tbl->rate.type);
1605
1606                 rate_idx = (high_low >> 8) & 0xff;
1607         }
1608
1609         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1610                        rate_idx, target_tpt,
1611                        rate_idx != IWL_RATE_INVALID ?
1612                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1613
1614         return rate_idx;
1615 }
1616
1617 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1618 {
1619         switch (sta->bandwidth) {
1620         case IEEE80211_STA_RX_BW_160:
1621                 return RATE_MCS_CHAN_WIDTH_160;
1622         case IEEE80211_STA_RX_BW_80:
1623                 return RATE_MCS_CHAN_WIDTH_80;
1624         case IEEE80211_STA_RX_BW_40:
1625                 return RATE_MCS_CHAN_WIDTH_40;
1626         case IEEE80211_STA_RX_BW_20:
1627         default:
1628                 return RATE_MCS_CHAN_WIDTH_20;
1629         }
1630 }
1631
1632 /*
1633  * Check whether we should continue using same modulation mode, or
1634  * begin search for a new mode, based on:
1635  * 1) # tx successes or failures while using this mode
1636  * 2) # times calling this function
1637  * 3) elapsed time in this mode (not used, for now)
1638  */
1639 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1640 {
1641         struct iwl_scale_tbl_info *tbl;
1642         int active_tbl;
1643         int flush_interval_passed = 0;
1644         struct iwl_mvm *mvm;
1645
1646         mvm = lq_sta->pers.drv;
1647         active_tbl = lq_sta->active_tbl;
1648
1649         tbl = &(lq_sta->lq_info[active_tbl]);
1650
1651         /* If we've been disallowing search, see if we should now allow it */
1652         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1653                 /* Elapsed time using current modulation mode */
1654                 if (lq_sta->flush_timer)
1655                         flush_interval_passed =
1656                                 time_after(jiffies,
1657                                            (unsigned long)(lq_sta->flush_timer +
1658                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1659
1660                 /*
1661                  * Check if we should allow search for new modulation mode.
1662                  * If many frames have failed or succeeded, or we've used
1663                  * this same modulation for a long time, allow search, and
1664                  * reset history stats that keep track of whether we should
1665                  * allow a new search.  Also (below) reset all bitmaps and
1666                  * stats in active history.
1667                  */
1668                 if (force_search ||
1669                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1670                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1671                     ((!lq_sta->search_better_tbl) &&
1672                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1673                         IWL_DEBUG_RATE(mvm,
1674                                        "LQ: stay is expired %d %d %d\n",
1675                                      lq_sta->total_failed,
1676                                      lq_sta->total_success,
1677                                      flush_interval_passed);
1678
1679                         /* Allow search for new mode */
1680                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1681                         IWL_DEBUG_RATE(mvm,
1682                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1683                         lq_sta->total_failed = 0;
1684                         lq_sta->total_success = 0;
1685                         lq_sta->flush_timer = 0;
1686                         /* mark the current column as visited */
1687                         lq_sta->visited_columns = BIT(tbl->column);
1688                 /*
1689                  * Else if we've used this modulation mode enough repetitions
1690                  * (regardless of elapsed time or success/failure), reset
1691                  * history bitmaps and rate-specific stats for all rates in
1692                  * active table.
1693                  */
1694                 } else {
1695                         lq_sta->table_count++;
1696                         if (lq_sta->table_count >=
1697                             lq_sta->table_count_limit) {
1698                                 lq_sta->table_count = 0;
1699
1700                                 IWL_DEBUG_RATE(mvm,
1701                                                "LQ: stay in table clear win\n");
1702                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1703                         }
1704                 }
1705
1706                 /* If transitioning to allow "search", reset all history
1707                  * bitmaps and stats in active table (this will become the new
1708                  * "search" table). */
1709                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1710                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1711                 }
1712         }
1713 }
1714
1715 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1716                              struct iwl_scale_tbl_info *tbl,
1717                              enum rs_action scale_action)
1718 {
1719         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
1720
1721         if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1722             tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1723             scale_action == RS_ACTION_DOWNSCALE)
1724                 sta_priv->tlc_amsdu = false;
1725         else
1726                 sta_priv->tlc_amsdu = true;
1727 }
1728
1729 /*
1730  * setup rate table in uCode
1731  */
1732 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1733                                struct ieee80211_sta *sta,
1734                                struct iwl_lq_sta *lq_sta,
1735                                struct iwl_scale_tbl_info *tbl)
1736 {
1737         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1738         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1739 }
1740
1741 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1742                               struct ieee80211_sta *sta,
1743                               struct iwl_lq_sta *lq_sta,
1744                               struct iwl_scale_tbl_info *tbl,
1745                               enum rs_action scale_action)
1746 {
1747         if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1748                 return false;
1749
1750         if (!is_vht_siso(&tbl->rate))
1751                 return false;
1752
1753         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1754             (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1755             (scale_action == RS_ACTION_DOWNSCALE)) {
1756                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1757                 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1758                 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1759                 goto tweaked;
1760         }
1761
1762         /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1763          * sustainable, i.e. we're past the test window. We can't go back
1764          * if MCS5 is just tested as this will happen always after switching
1765          * to 20Mhz MCS4 because the rate stats are cleared.
1766          */
1767         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1768             (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1769              (scale_action == RS_ACTION_STAY)) ||
1770              ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1771               (scale_action == RS_ACTION_UPSCALE)))) {
1772                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1773                 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1774                 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1775                 goto tweaked;
1776         }
1777
1778         return false;
1779
1780 tweaked:
1781         rs_set_expected_tpt_table(lq_sta, tbl);
1782         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1783         return true;
1784 }
1785
1786 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1787                                          struct iwl_lq_sta *lq_sta,
1788                                          struct ieee80211_sta *sta,
1789                                          struct iwl_scale_tbl_info *tbl)
1790 {
1791         int i, j, max_rate;
1792         enum rs_column next_col_id;
1793         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1794         const struct rs_tx_column *next_col;
1795         allow_column_func_t allow_func;
1796         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1797         const u16 *expected_tpt_tbl;
1798         u16 tpt, max_expected_tpt;
1799
1800         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1801                 next_col_id = curr_col->next_columns[i];
1802
1803                 if (next_col_id == RS_COLUMN_INVALID)
1804                         continue;
1805
1806                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1807                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1808                                        next_col_id);
1809                         continue;
1810                 }
1811
1812                 next_col = &rs_tx_columns[next_col_id];
1813
1814                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1815                         IWL_DEBUG_RATE(mvm,
1816                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1817                                        next_col_id, valid_ants, next_col->ant);
1818                         continue;
1819                 }
1820
1821                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1822                         allow_func = next_col->checks[j];
1823                         if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1824                                                       next_col))
1825                                 break;
1826                 }
1827
1828                 if (j != MAX_COLUMN_CHECKS) {
1829                         IWL_DEBUG_RATE(mvm,
1830                                        "Skip column %d: not allowed (check %d failed)\n",
1831                                        next_col_id, j);
1832
1833                         continue;
1834                 }
1835
1836                 tpt = lq_sta->last_tpt / 100;
1837                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1838                                                      rs_bw_from_sta_bw(sta));
1839                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1840                         continue;
1841
1842                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1843                 if (max_rate == IWL_RATE_INVALID) {
1844                         IWL_DEBUG_RATE(mvm,
1845                                        "Skip column %d: no rate is allowed in this column\n",
1846                                        next_col_id);
1847                         continue;
1848                 }
1849
1850                 max_expected_tpt = expected_tpt_tbl[max_rate];
1851                 if (tpt >= max_expected_tpt) {
1852                         IWL_DEBUG_RATE(mvm,
1853                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1854                                        next_col_id, max_expected_tpt, tpt);
1855                         continue;
1856                 }
1857
1858                 IWL_DEBUG_RATE(mvm,
1859                                "Found potential column %d. Max expected %d current %d\n",
1860                                next_col_id, max_expected_tpt, tpt);
1861                 break;
1862         }
1863
1864         if (i == MAX_NEXT_COLUMNS)
1865                 return RS_COLUMN_INVALID;
1866
1867         return next_col_id;
1868 }
1869
1870 static int rs_switch_to_column(struct iwl_mvm *mvm,
1871                                struct iwl_lq_sta *lq_sta,
1872                                struct ieee80211_sta *sta,
1873                                enum rs_column col_id)
1874 {
1875         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1876         struct iwl_scale_tbl_info *search_tbl =
1877                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1878         struct rs_rate *rate = &search_tbl->rate;
1879         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1880         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1881         unsigned long rate_mask = 0;
1882         u32 rate_idx = 0;
1883
1884         memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1885
1886         rate->sgi = column->sgi;
1887         rate->ant = column->ant;
1888
1889         if (column->mode == RS_LEGACY) {
1890                 if (lq_sta->band == NL80211_BAND_5GHZ)
1891                         rate->type = LQ_LEGACY_A;
1892                 else
1893                         rate->type = LQ_LEGACY_G;
1894
1895                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1896                 rate->ldpc = false;
1897                 rate_mask = lq_sta->active_legacy_rate;
1898         } else if (column->mode == RS_SISO) {
1899                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1900                 rate_mask = lq_sta->active_siso_rate;
1901         } else if (column->mode == RS_MIMO2) {
1902                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1903                 rate_mask = lq_sta->active_mimo2_rate;
1904         } else {
1905                 WARN_ONCE(1, "Bad column mode");
1906         }
1907
1908         if (column->mode != RS_LEGACY) {
1909                 rate->bw = rs_bw_from_sta_bw(sta);
1910                 rate->ldpc = lq_sta->ldpc;
1911         }
1912
1913         search_tbl->column = col_id;
1914         rs_set_expected_tpt_table(lq_sta, search_tbl);
1915
1916         lq_sta->visited_columns |= BIT(col_id);
1917
1918         /* Get the best matching rate if we're changing modes. e.g.
1919          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1920          */
1921         if (curr_column->mode != column->mode) {
1922                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1923                                             rate_mask, rate->index);
1924
1925                 if ((rate_idx == IWL_RATE_INVALID) ||
1926                     !(BIT(rate_idx) & rate_mask)) {
1927                         IWL_DEBUG_RATE(mvm,
1928                                        "can not switch with index %d"
1929                                        " rate mask %lx\n",
1930                                        rate_idx, rate_mask);
1931
1932                         goto err;
1933                 }
1934
1935                 rate->index = rate_idx;
1936         }
1937
1938         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1939                        col_id, rate->index);
1940
1941         return 0;
1942
1943 err:
1944         rate->type = LQ_NONE;
1945         return -1;
1946 }
1947
1948 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1949                                          struct iwl_scale_tbl_info *tbl,
1950                                          s32 sr, int low, int high,
1951                                          int current_tpt,
1952                                          int low_tpt, int high_tpt)
1953 {
1954         enum rs_action action = RS_ACTION_STAY;
1955
1956         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1957             (current_tpt == 0)) {
1958                 IWL_DEBUG_RATE(mvm,
1959                                "Decrease rate because of low SR\n");
1960                 return RS_ACTION_DOWNSCALE;
1961         }
1962
1963         if ((low_tpt == IWL_INVALID_VALUE) &&
1964             (high_tpt == IWL_INVALID_VALUE) &&
1965             (high != IWL_RATE_INVALID)) {
1966                 IWL_DEBUG_RATE(mvm,
1967                                "No data about high/low rates. Increase rate\n");
1968                 return RS_ACTION_UPSCALE;
1969         }
1970
1971         if ((high_tpt == IWL_INVALID_VALUE) &&
1972             (high != IWL_RATE_INVALID) &&
1973             (low_tpt != IWL_INVALID_VALUE) &&
1974             (low_tpt < current_tpt)) {
1975                 IWL_DEBUG_RATE(mvm,
1976                                "No data about high rate and low rate is worse. Increase rate\n");
1977                 return RS_ACTION_UPSCALE;
1978         }
1979
1980         if ((high_tpt != IWL_INVALID_VALUE) &&
1981             (high_tpt > current_tpt)) {
1982                 IWL_DEBUG_RATE(mvm,
1983                                "Higher rate is better. Increate rate\n");
1984                 return RS_ACTION_UPSCALE;
1985         }
1986
1987         if ((low_tpt != IWL_INVALID_VALUE) &&
1988             (high_tpt != IWL_INVALID_VALUE) &&
1989             (low_tpt < current_tpt) &&
1990             (high_tpt < current_tpt)) {
1991                 IWL_DEBUG_RATE(mvm,
1992                                "Both high and low are worse. Maintain rate\n");
1993                 return RS_ACTION_STAY;
1994         }
1995
1996         if ((low_tpt != IWL_INVALID_VALUE) &&
1997             (low_tpt > current_tpt)) {
1998                 IWL_DEBUG_RATE(mvm,
1999                                "Lower rate is better\n");
2000                 action = RS_ACTION_DOWNSCALE;
2001                 goto out;
2002         }
2003
2004         if ((low_tpt == IWL_INVALID_VALUE) &&
2005             (low != IWL_RATE_INVALID)) {
2006                 IWL_DEBUG_RATE(mvm,
2007                                "No data about lower rate\n");
2008                 action = RS_ACTION_DOWNSCALE;
2009                 goto out;
2010         }
2011
2012         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
2013
2014 out:
2015         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
2016                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
2017                         IWL_DEBUG_RATE(mvm,
2018                                        "SR is above NO DECREASE. Avoid downscale\n");
2019                         action = RS_ACTION_STAY;
2020                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
2021                         IWL_DEBUG_RATE(mvm,
2022                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
2023                         action = RS_ACTION_STAY;
2024                 } else {
2025                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
2026                 }
2027         }
2028
2029         return action;
2030 }
2031
2032 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2033                           struct iwl_lq_sta *lq_sta)
2034 {
2035         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
2036          * supports STBC of at least 1*SS
2037          */
2038         if (!lq_sta->stbc_capable)
2039                 return false;
2040
2041         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2042                 return false;
2043
2044         return true;
2045 }
2046
2047 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2048                                 int *weaker, int *stronger)
2049 {
2050         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2051         if (*weaker > TPC_MAX_REDUCTION)
2052                 *weaker = TPC_INVALID;
2053
2054         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2055         if (*stronger < 0)
2056                 *stronger = TPC_INVALID;
2057 }
2058
2059 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2060                            struct rs_rate *rate, enum nl80211_band band)
2061 {
2062         int index = rate->index;
2063         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2064         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2065                                 !vif->bss_conf.ps);
2066
2067         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2068                        cam, sta_ps_disabled);
2069         /*
2070          * allow tpc only if power management is enabled, or bt coex
2071          * activity grade allows it and we are on 2.4Ghz.
2072          */
2073         if ((cam || sta_ps_disabled) &&
2074             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2075                 return false;
2076
2077         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2078         if (is_legacy(rate))
2079                 return index == IWL_RATE_54M_INDEX;
2080         if (is_ht(rate))
2081                 return index == IWL_RATE_MCS_7_INDEX;
2082         if (is_vht(rate))
2083                 return index == IWL_RATE_MCS_7_INDEX ||
2084                        index == IWL_RATE_MCS_8_INDEX ||
2085                        index == IWL_RATE_MCS_9_INDEX;
2086
2087         WARN_ON_ONCE(1);
2088         return false;
2089 }
2090
2091 enum tpc_action {
2092         TPC_ACTION_STAY,
2093         TPC_ACTION_DECREASE,
2094         TPC_ACTION_INCREASE,
2095         TPC_ACTION_NO_RESTIRCTION,
2096 };
2097
2098 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2099                                          s32 sr, int weak, int strong,
2100                                          int current_tpt,
2101                                          int weak_tpt, int strong_tpt)
2102 {
2103         /* stay until we have valid tpt */
2104         if (current_tpt == IWL_INVALID_VALUE) {
2105                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2106                 return TPC_ACTION_STAY;
2107         }
2108
2109         /* Too many failures, increase txp */
2110         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2111             current_tpt == 0) {
2112                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2113                 return TPC_ACTION_NO_RESTIRCTION;
2114         }
2115
2116         /* try decreasing first if applicable */
2117         if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2118             weak != TPC_INVALID) {
2119                 if (weak_tpt == IWL_INVALID_VALUE &&
2120                     (strong_tpt == IWL_INVALID_VALUE ||
2121                      current_tpt >= strong_tpt)) {
2122                         IWL_DEBUG_RATE(mvm,
2123                                        "no weak txp measurement. decrease txp\n");
2124                         return TPC_ACTION_DECREASE;
2125                 }
2126
2127                 if (weak_tpt > current_tpt) {
2128                         IWL_DEBUG_RATE(mvm,
2129                                        "lower txp has better tpt. decrease txp\n");
2130                         return TPC_ACTION_DECREASE;
2131                 }
2132         }
2133
2134         /* next, increase if needed */
2135         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2136             strong != TPC_INVALID) {
2137                 if (weak_tpt == IWL_INVALID_VALUE &&
2138                     strong_tpt != IWL_INVALID_VALUE &&
2139                     current_tpt < strong_tpt) {
2140                         IWL_DEBUG_RATE(mvm,
2141                                        "higher txp has better tpt. increase txp\n");
2142                         return TPC_ACTION_INCREASE;
2143                 }
2144
2145                 if (weak_tpt < current_tpt &&
2146                     (strong_tpt == IWL_INVALID_VALUE ||
2147                      strong_tpt > current_tpt)) {
2148                         IWL_DEBUG_RATE(mvm,
2149                                        "lower txp has worse tpt. increase txp\n");
2150                         return TPC_ACTION_INCREASE;
2151                 }
2152         }
2153
2154         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2155         return TPC_ACTION_STAY;
2156 }
2157
2158 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2159                            struct ieee80211_sta *sta,
2160                            struct iwl_lq_sta *lq_sta,
2161                            struct iwl_scale_tbl_info *tbl)
2162 {
2163         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2164         struct ieee80211_vif *vif = mvm_sta->vif;
2165         struct ieee80211_chanctx_conf *chanctx_conf;
2166         enum nl80211_band band;
2167         struct iwl_rate_scale_data *window;
2168         struct rs_rate *rate = &tbl->rate;
2169         enum tpc_action action;
2170         s32 sr;
2171         u8 cur = lq_sta->lq.reduced_tpc;
2172         int current_tpt;
2173         int weak, strong;
2174         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2175
2176 #ifdef CONFIG_MAC80211_DEBUGFS
2177         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2178                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2179                                lq_sta->pers.dbg_fixed_txp_reduction);
2180                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2181                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2182         }
2183 #endif
2184
2185         rcu_read_lock();
2186         chanctx_conf = rcu_dereference(vif->chanctx_conf);
2187         if (WARN_ON(!chanctx_conf))
2188                 band = NUM_NL80211_BANDS;
2189         else
2190                 band = chanctx_conf->def.chan->band;
2191         rcu_read_unlock();
2192
2193         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2194                 IWL_DEBUG_RATE(mvm,
2195                                "tpc is not allowed. remove txp restrictions\n");
2196                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2197                 return cur != TPC_NO_REDUCTION;
2198         }
2199
2200         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2201
2202         /* Collect measured throughputs for current and adjacent rates */
2203         window = tbl->tpc_win;
2204         sr = window[cur].success_ratio;
2205         current_tpt = window[cur].average_tpt;
2206         if (weak != TPC_INVALID)
2207                 weak_tpt = window[weak].average_tpt;
2208         if (strong != TPC_INVALID)
2209                 strong_tpt = window[strong].average_tpt;
2210
2211         IWL_DEBUG_RATE(mvm,
2212                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2213                        cur, current_tpt, sr, weak, strong,
2214                        weak_tpt, strong_tpt);
2215
2216         action = rs_get_tpc_action(mvm, sr, weak, strong,
2217                                    current_tpt, weak_tpt, strong_tpt);
2218
2219         /* override actions if we are on the edge */
2220         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2221                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2222                 action = TPC_ACTION_STAY;
2223         } else if (strong == TPC_INVALID &&
2224                    (action == TPC_ACTION_INCREASE ||
2225                     action == TPC_ACTION_NO_RESTIRCTION)) {
2226                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2227                 action = TPC_ACTION_STAY;
2228         }
2229
2230         switch (action) {
2231         case TPC_ACTION_DECREASE:
2232                 lq_sta->lq.reduced_tpc = weak;
2233                 return true;
2234         case TPC_ACTION_INCREASE:
2235                 lq_sta->lq.reduced_tpc = strong;
2236                 return true;
2237         case TPC_ACTION_NO_RESTIRCTION:
2238                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2239                 return true;
2240         case TPC_ACTION_STAY:
2241                 /* do nothing */
2242                 break;
2243         }
2244         return false;
2245 }
2246
2247 /*
2248  * Do rate scaling and search for new modulation mode.
2249  */
2250 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2251                                   struct ieee80211_sta *sta,
2252                                   struct iwl_lq_sta *lq_sta,
2253                                   int tid, bool ndp)
2254 {
2255         int low = IWL_RATE_INVALID;
2256         int high = IWL_RATE_INVALID;
2257         int index;
2258         struct iwl_rate_scale_data *window = NULL;
2259         int current_tpt = IWL_INVALID_VALUE;
2260         int low_tpt = IWL_INVALID_VALUE;
2261         int high_tpt = IWL_INVALID_VALUE;
2262         u32 fail_count;
2263         enum rs_action scale_action = RS_ACTION_STAY;
2264         u16 rate_mask;
2265         u8 update_lq = 0;
2266         struct iwl_scale_tbl_info *tbl, *tbl1;
2267         u8 active_tbl = 0;
2268         u8 done_search = 0;
2269         u16 high_low;
2270         s32 sr;
2271         u8 prev_agg = lq_sta->is_agg;
2272         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2273         struct iwl_mvm_tid_data *tid_data;
2274         struct rs_rate *rate;
2275
2276         lq_sta->is_agg = !!sta_priv->agg_tids;
2277
2278         /*
2279          * Select rate-scale / modulation-mode table to work with in
2280          * the rest of this function:  "search" if searching for better
2281          * modulation mode, or "active" if doing rate scaling within a mode.
2282          */
2283         if (!lq_sta->search_better_tbl)
2284                 active_tbl = lq_sta->active_tbl;
2285         else
2286                 active_tbl = 1 - lq_sta->active_tbl;
2287
2288         tbl = &(lq_sta->lq_info[active_tbl]);
2289         rate = &tbl->rate;
2290
2291         if (prev_agg != lq_sta->is_agg) {
2292                 IWL_DEBUG_RATE(mvm,
2293                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2294                                prev_agg, lq_sta->is_agg);
2295                 rs_set_expected_tpt_table(lq_sta, tbl);
2296                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2297         }
2298
2299         /* current tx rate */
2300         index = rate->index;
2301
2302         /* rates available for this association, and for modulation mode */
2303         rate_mask = rs_get_supported_rates(lq_sta, rate);
2304
2305         if (!(BIT(index) & rate_mask)) {
2306                 IWL_ERR(mvm, "Current Rate is not valid\n");
2307                 if (lq_sta->search_better_tbl) {
2308                         /* revert to active table if search table is not valid*/
2309                         rate->type = LQ_NONE;
2310                         lq_sta->search_better_tbl = 0;
2311                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2312                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2313                 }
2314                 return;
2315         }
2316
2317         /* Get expected throughput table and history window for current rate */
2318         if (!tbl->expected_tpt) {
2319                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2320                 return;
2321         }
2322
2323         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2324         window = &(tbl->win[index]);
2325
2326         /*
2327          * If there is not enough history to calculate actual average
2328          * throughput, keep analyzing results of more tx frames, without
2329          * changing rate or mode (bypass most of the rest of this function).
2330          * Set up new rate table in uCode only if old rate is not supported
2331          * in current association (use new rate found above).
2332          */
2333         fail_count = window->counter - window->success_counter;
2334         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2335             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2336                 IWL_DEBUG_RATE(mvm,
2337                                "%s: Test Window: succ %d total %d\n",
2338                                rs_pretty_rate(rate),
2339                                window->success_counter, window->counter);
2340
2341                 /* Can't calculate this yet; not enough history */
2342                 window->average_tpt = IWL_INVALID_VALUE;
2343
2344                 /* Should we stay with this modulation mode,
2345                  * or search for a new one? */
2346                 rs_stay_in_table(lq_sta, false);
2347
2348                 return;
2349         }
2350
2351         /* If we are searching for better modulation mode, check success. */
2352         if (lq_sta->search_better_tbl) {
2353                 /* If good success, continue using the "search" mode;
2354                  * no need to send new link quality command, since we're
2355                  * continuing to use the setup that we've been trying. */
2356                 if (window->average_tpt > lq_sta->last_tpt) {
2357                         IWL_DEBUG_RATE(mvm,
2358                                        "SWITCHING TO NEW TABLE SR: %d "
2359                                        "cur-tpt %d old-tpt %d\n",
2360                                        window->success_ratio,
2361                                        window->average_tpt,
2362                                        lq_sta->last_tpt);
2363
2364                         /* Swap tables; "search" becomes "active" */
2365                         lq_sta->active_tbl = active_tbl;
2366                         current_tpt = window->average_tpt;
2367                 /* Else poor success; go back to mode in "active" table */
2368                 } else {
2369                         IWL_DEBUG_RATE(mvm,
2370                                        "GOING BACK TO THE OLD TABLE: SR %d "
2371                                        "cur-tpt %d old-tpt %d\n",
2372                                        window->success_ratio,
2373                                        window->average_tpt,
2374                                        lq_sta->last_tpt);
2375
2376                         /* Nullify "search" table */
2377                         rate->type = LQ_NONE;
2378
2379                         /* Revert to "active" table */
2380                         active_tbl = lq_sta->active_tbl;
2381                         tbl = &(lq_sta->lq_info[active_tbl]);
2382
2383                         /* Revert to "active" rate and throughput info */
2384                         index = tbl->rate.index;
2385                         current_tpt = lq_sta->last_tpt;
2386
2387                         /* Need to set up a new rate table in uCode */
2388                         update_lq = 1;
2389                 }
2390
2391                 /* Either way, we've made a decision; modulation mode
2392                  * search is done, allow rate adjustment next time. */
2393                 lq_sta->search_better_tbl = 0;
2394                 done_search = 1;        /* Don't switch modes below! */
2395                 goto lq_update;
2396         }
2397
2398         /* (Else) not in search of better modulation mode, try for better
2399          * starting rate, while staying in this mode. */
2400         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2401         low = high_low & 0xff;
2402         high = (high_low >> 8) & 0xff;
2403
2404         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2405
2406         sr = window->success_ratio;
2407
2408         /* Collect measured throughputs for current and adjacent rates */
2409         current_tpt = window->average_tpt;
2410         if (low != IWL_RATE_INVALID)
2411                 low_tpt = tbl->win[low].average_tpt;
2412         if (high != IWL_RATE_INVALID)
2413                 high_tpt = tbl->win[high].average_tpt;
2414
2415         IWL_DEBUG_RATE(mvm,
2416                        "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2417                        rs_pretty_rate(rate), current_tpt, sr,
2418                        low, high, low_tpt, high_tpt);
2419
2420         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2421                                           current_tpt, low_tpt, high_tpt);
2422
2423         /* Force a search in case BT doesn't like us being in MIMO */
2424         if (is_mimo(rate) &&
2425             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2426                 IWL_DEBUG_RATE(mvm,
2427                                "BT Coex forbids MIMO. Search for new config\n");
2428                 rs_stay_in_table(lq_sta, true);
2429                 goto lq_update;
2430         }
2431
2432         switch (scale_action) {
2433         case RS_ACTION_DOWNSCALE:
2434                 /* Decrease starting rate, update uCode's rate table */
2435                 if (low != IWL_RATE_INVALID) {
2436                         update_lq = 1;
2437                         index = low;
2438                 } else {
2439                         IWL_DEBUG_RATE(mvm,
2440                                        "At the bottom rate. Can't decrease\n");
2441                 }
2442
2443                 break;
2444         case RS_ACTION_UPSCALE:
2445                 /* Increase starting rate, update uCode's rate table */
2446                 if (high != IWL_RATE_INVALID) {
2447                         update_lq = 1;
2448                         index = high;
2449                 } else {
2450                         IWL_DEBUG_RATE(mvm,
2451                                        "At the top rate. Can't increase\n");
2452                 }
2453
2454                 break;
2455         case RS_ACTION_STAY:
2456                 /* No change */
2457                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2458                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2459                 break;
2460         default:
2461                 break;
2462         }
2463
2464 lq_update:
2465         /* Replace uCode's rate table for the destination station. */
2466         if (update_lq) {
2467                 tbl->rate.index = index;
2468                 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2469                         rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2470                 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2471                 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2472         }
2473
2474         rs_stay_in_table(lq_sta, false);
2475
2476         /*
2477          * Search for new modulation mode if we're:
2478          * 1)  Not changing rates right now
2479          * 2)  Not just finishing up a search
2480          * 3)  Allowing a new search
2481          */
2482         if (!update_lq && !done_search &&
2483             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2484             && window->counter) {
2485                 enum rs_column next_column;
2486
2487                 /* Save current throughput to compare with "search" throughput*/
2488                 lq_sta->last_tpt = current_tpt;
2489
2490                 IWL_DEBUG_RATE(mvm,
2491                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2492                                update_lq, done_search, lq_sta->rs_state,
2493                                window->counter);
2494
2495                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2496                 if (next_column != RS_COLUMN_INVALID) {
2497                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2498                                                       next_column);
2499                         if (!ret)
2500                                 lq_sta->search_better_tbl = 1;
2501                 } else {
2502                         IWL_DEBUG_RATE(mvm,
2503                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2504                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2505                 }
2506
2507                 /* If new "search" mode was selected, set up in uCode table */
2508                 if (lq_sta->search_better_tbl) {
2509                         /* Access the "search" table, clear its history. */
2510                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2511                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2512
2513                         /* Use new "search" start rate */
2514                         index = tbl->rate.index;
2515
2516                         rs_dump_rate(mvm, &tbl->rate,
2517                                      "Switch to SEARCH TABLE:");
2518                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2519                 } else {
2520                         done_search = 1;
2521                 }
2522         }
2523
2524         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2525                 /* If the "active" (non-search) mode was legacy,
2526                  * and we've tried switching antennas,
2527                  * but we haven't been able to try HT modes (not available),
2528                  * stay with best antenna legacy modulation for a while
2529                  * before next round of mode comparisons. */
2530                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2531                 if (is_legacy(&tbl1->rate)) {
2532                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2533
2534                         if (tid != IWL_MAX_TID_COUNT) {
2535                                 tid_data = &sta_priv->tid_data[tid];
2536                                 if (tid_data->state != IWL_AGG_OFF) {
2537                                         IWL_DEBUG_RATE(mvm,
2538                                                        "Stop aggregation on tid %d\n",
2539                                                        tid);
2540                                         ieee80211_stop_tx_ba_session(sta, tid);
2541                                 }
2542                         }
2543                         rs_set_stay_in_table(mvm, 1, lq_sta);
2544                 } else {
2545                 /* If we're in an HT mode, and all 3 mode switch actions
2546                  * have been tried and compared, stay in this best modulation
2547                  * mode for a while before next round of mode comparisons. */
2548                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2549                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2550                             (tid != IWL_MAX_TID_COUNT)) {
2551                                 tid_data = &sta_priv->tid_data[tid];
2552                                 if (tid_data->state == IWL_AGG_OFF && !ndp) {
2553                                         IWL_DEBUG_RATE(mvm,
2554                                                        "try to aggregate tid %d\n",
2555                                                        tid);
2556                                         rs_tl_turn_on_agg(mvm, tid,
2557                                                           lq_sta, sta);
2558                                 }
2559                         }
2560                         rs_set_stay_in_table(mvm, 0, lq_sta);
2561                 }
2562         }
2563 }
2564
2565 struct rs_init_rate_info {
2566         s8 rssi;
2567         u8 rate_idx;
2568 };
2569
2570 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2571         { -60, IWL_RATE_54M_INDEX },
2572         { -64, IWL_RATE_48M_INDEX },
2573         { -68, IWL_RATE_36M_INDEX },
2574         { -80, IWL_RATE_24M_INDEX },
2575         { -84, IWL_RATE_18M_INDEX },
2576         { -85, IWL_RATE_12M_INDEX },
2577         { -86, IWL_RATE_11M_INDEX },
2578         { -88, IWL_RATE_5M_INDEX  },
2579         { -90, IWL_RATE_2M_INDEX  },
2580         { S8_MIN, IWL_RATE_1M_INDEX },
2581 };
2582
2583 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2584         { -60, IWL_RATE_54M_INDEX },
2585         { -64, IWL_RATE_48M_INDEX },
2586         { -72, IWL_RATE_36M_INDEX },
2587         { -80, IWL_RATE_24M_INDEX },
2588         { -84, IWL_RATE_18M_INDEX },
2589         { -85, IWL_RATE_12M_INDEX },
2590         { -87, IWL_RATE_9M_INDEX  },
2591         { S8_MIN, IWL_RATE_6M_INDEX },
2592 };
2593
2594 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2595         { -60, IWL_RATE_MCS_7_INDEX },
2596         { -64, IWL_RATE_MCS_6_INDEX },
2597         { -68, IWL_RATE_MCS_5_INDEX },
2598         { -72, IWL_RATE_MCS_4_INDEX },
2599         { -80, IWL_RATE_MCS_3_INDEX },
2600         { -84, IWL_RATE_MCS_2_INDEX },
2601         { -85, IWL_RATE_MCS_1_INDEX },
2602         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2603 };
2604
2605 /* MCS index 9 is not valid for 20MHz VHT channel width,
2606  * but is ok for 40, 80 and 160MHz channels.
2607  */
2608 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2609         { -60, IWL_RATE_MCS_8_INDEX },
2610         { -64, IWL_RATE_MCS_7_INDEX },
2611         { -68, IWL_RATE_MCS_6_INDEX },
2612         { -72, IWL_RATE_MCS_5_INDEX },
2613         { -80, IWL_RATE_MCS_4_INDEX },
2614         { -84, IWL_RATE_MCS_3_INDEX },
2615         { -85, IWL_RATE_MCS_2_INDEX },
2616         { -87, IWL_RATE_MCS_1_INDEX },
2617         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2618 };
2619
2620 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2621         { -60, IWL_RATE_MCS_9_INDEX },
2622         { -64, IWL_RATE_MCS_8_INDEX },
2623         { -68, IWL_RATE_MCS_7_INDEX },
2624         { -72, IWL_RATE_MCS_6_INDEX },
2625         { -80, IWL_RATE_MCS_5_INDEX },
2626         { -84, IWL_RATE_MCS_4_INDEX },
2627         { -85, IWL_RATE_MCS_3_INDEX },
2628         { -87, IWL_RATE_MCS_2_INDEX },
2629         { -88, IWL_RATE_MCS_1_INDEX },
2630         { S8_MIN, IWL_RATE_MCS_0_INDEX },
2631 };
2632
2633 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2634
2635 /* Init the optimal rate based on STA caps
2636  * This combined with rssi is used to report the last tx rate
2637  * to userspace when we haven't transmitted enough frames.
2638  */
2639 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2640                                  struct ieee80211_sta *sta,
2641                                  struct iwl_lq_sta *lq_sta)
2642 {
2643         struct rs_rate *rate = &lq_sta->optimal_rate;
2644
2645         if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2646                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2647         else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2648                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2649         else if (lq_sta->band == NL80211_BAND_5GHZ)
2650                 rate->type = LQ_LEGACY_A;
2651         else
2652                 rate->type = LQ_LEGACY_G;
2653
2654         rate->bw = rs_bw_from_sta_bw(sta);
2655         rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2656
2657         /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2658
2659         if (is_mimo(rate)) {
2660                 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2661         } else if (is_siso(rate)) {
2662                 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2663         } else {
2664                 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2665
2666                 if (lq_sta->band == NL80211_BAND_5GHZ) {
2667                         lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2668                         lq_sta->optimal_nentries =
2669                                 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2670                 } else {
2671                         lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2672                         lq_sta->optimal_nentries =
2673                                 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2674                 }
2675         }
2676
2677         if (is_vht(rate)) {
2678                 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2679                         lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2680                         lq_sta->optimal_nentries =
2681                                 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2682                 } else {
2683                         lq_sta->optimal_rates = rs_optimal_rates_vht;
2684                         lq_sta->optimal_nentries =
2685                                 ARRAY_SIZE(rs_optimal_rates_vht);
2686                 }
2687         } else if (is_ht(rate)) {
2688                 lq_sta->optimal_rates = rs_optimal_rates_ht;
2689                 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2690         }
2691 }
2692
2693 /* Compute the optimal rate index based on RSSI */
2694 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2695                                            struct iwl_lq_sta *lq_sta)
2696 {
2697         struct rs_rate *rate = &lq_sta->optimal_rate;
2698         int i;
2699
2700         rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2701                                      BITS_PER_LONG);
2702
2703         for (i = 0; i < lq_sta->optimal_nentries; i++) {
2704                 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2705
2706                 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2707                     (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2708                         rate->index = rate_idx;
2709                         break;
2710                 }
2711         }
2712
2713         return rate;
2714 }
2715
2716 /* Choose an initial legacy rate and antenna to use based on the RSSI
2717  * of last Rx
2718  */
2719 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2720                                 struct ieee80211_sta *sta,
2721                                 struct iwl_lq_sta *lq_sta,
2722                                 enum nl80211_band band,
2723                                 struct rs_rate *rate,
2724                                 bool init)
2725 {
2726         int i, nentries;
2727         unsigned long active_rate;
2728         s8 best_rssi = S8_MIN;
2729         u8 best_ant = ANT_NONE;
2730         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2731         const struct rs_init_rate_info *initial_rates;
2732
2733         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2734                 if (!(lq_sta->pers.chains & BIT(i)))
2735                         continue;
2736
2737                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2738                         best_rssi = lq_sta->pers.chain_signal[i];
2739                         best_ant = BIT(i);
2740                 }
2741         }
2742
2743         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2744                        rs_pretty_ant(best_ant), best_rssi);
2745
2746         if (best_ant != ANT_A && best_ant != ANT_B)
2747                 rate->ant = first_antenna(valid_tx_ant);
2748         else
2749                 rate->ant = best_ant;
2750
2751         rate->sgi = false;
2752         rate->ldpc = false;
2753         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2754
2755         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2756                                      BITS_PER_LONG);
2757
2758         if (band == NL80211_BAND_5GHZ) {
2759                 rate->type = LQ_LEGACY_A;
2760                 initial_rates = rs_optimal_rates_5ghz_legacy;
2761                 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2762         } else {
2763                 rate->type = LQ_LEGACY_G;
2764                 initial_rates = rs_optimal_rates_24ghz_legacy;
2765                 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2766         }
2767
2768         if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2769                 goto out;
2770
2771         /* Start from a higher rate if the corresponding debug capability
2772          * is enabled. The rate is chosen according to AP capabilities.
2773          * In case of VHT/HT when the rssi is low fallback to the case of
2774          * legacy rates.
2775          */
2776         if (sta->vht_cap.vht_supported &&
2777             best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2778                 /*
2779                  * In AP mode, when a new station associates, rs is initialized
2780                  * immediately upon association completion, before the phy
2781                  * context is updated with the association parameters, so the
2782                  * sta bandwidth might be wider than the phy context allows.
2783                  * To avoid this issue, always initialize rs with 20mhz
2784                  * bandwidth rate, and after authorization, when the phy context
2785                  * is already up-to-date, re-init rs with the correct bw.
2786                  */
2787                 u32 bw = init ? RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2788
2789                 switch (bw) {
2790                 case RATE_MCS_CHAN_WIDTH_40:
2791                 case RATE_MCS_CHAN_WIDTH_80:
2792                 case RATE_MCS_CHAN_WIDTH_160:
2793                         initial_rates = rs_optimal_rates_vht;
2794                         nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2795                         break;
2796                 case RATE_MCS_CHAN_WIDTH_20:
2797                         initial_rates = rs_optimal_rates_vht_20mhz;
2798                         nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2799                         break;
2800                 default:
2801                         IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2802                         goto out;
2803                 }
2804
2805                 active_rate = lq_sta->active_siso_rate;
2806                 rate->type = LQ_VHT_SISO;
2807                 rate->bw = bw;
2808         } else if (sta->ht_cap.ht_supported &&
2809                    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2810                 initial_rates = rs_optimal_rates_ht;
2811                 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2812                 active_rate = lq_sta->active_siso_rate;
2813                 rate->type = LQ_HT_SISO;
2814         } else {
2815                 active_rate = lq_sta->active_legacy_rate;
2816         }
2817
2818         for (i = 0; i < nentries; i++) {
2819                 int rate_idx = initial_rates[i].rate_idx;
2820
2821                 if ((best_rssi >= initial_rates[i].rssi) &&
2822                     (BIT(rate_idx) & active_rate)) {
2823                         rate->index = rate_idx;
2824                         break;
2825                 }
2826         }
2827
2828 out:
2829         rs_dump_rate(mvm, rate, "INITIAL");
2830 }
2831
2832 /* Save info about RSSI of last Rx */
2833 void rs_update_last_rssi(struct iwl_mvm *mvm,
2834                          struct iwl_lq_sta *lq_sta,
2835                          struct ieee80211_rx_status *rx_status)
2836 {
2837         int i;
2838
2839         lq_sta->pers.chains = rx_status->chains;
2840         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2841         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2842         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2843         lq_sta->pers.last_rssi = S8_MIN;
2844
2845         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2846                 if (!(lq_sta->pers.chains & BIT(i)))
2847                         continue;
2848
2849                 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2850                         lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2851         }
2852 }
2853
2854 /**
2855  * rs_initialize_lq - Initialize a station's hardware rate table
2856  *
2857  * The uCode's station table contains a table of fallback rates
2858  * for automatic fallback during transmission.
2859  *
2860  * NOTE: This sets up a default set of values.  These will be replaced later
2861  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2862  *       rc80211_simple.
2863  *
2864  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2865  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2866  *       which requires station table entry to exist).
2867  */
2868 static void rs_initialize_lq(struct iwl_mvm *mvm,
2869                              struct ieee80211_sta *sta,
2870                              struct iwl_lq_sta *lq_sta,
2871                              enum nl80211_band band,
2872                              bool init)
2873 {
2874         struct iwl_scale_tbl_info *tbl;
2875         struct rs_rate *rate;
2876         u8 active_tbl = 0;
2877
2878         if (!sta || !lq_sta)
2879                 return;
2880
2881         if (!lq_sta->search_better_tbl)
2882                 active_tbl = lq_sta->active_tbl;
2883         else
2884                 active_tbl = 1 - lq_sta->active_tbl;
2885
2886         tbl = &(lq_sta->lq_info[active_tbl]);
2887         rate = &tbl->rate;
2888
2889         rs_get_initial_rate(mvm, sta, lq_sta, band, rate, init);
2890         rs_init_optimal_rate(mvm, sta, lq_sta);
2891
2892         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2893         tbl->column = rs_get_column_from_rate(rate);
2894
2895         rs_set_expected_tpt_table(lq_sta, tbl);
2896         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2897         /* TODO restore station should remember the lq cmd */
2898         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2899 }
2900
2901 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2902                         struct ieee80211_tx_rate_control *txrc)
2903 {
2904         struct sk_buff *skb = txrc->skb;
2905         struct iwl_op_mode *op_mode __maybe_unused =
2906                         (struct iwl_op_mode *)mvm_r;
2907         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2908         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2909         struct iwl_lq_sta *lq_sta = mvm_sta;
2910         struct rs_rate *optimal_rate;
2911         u32 last_ucode_rate;
2912
2913         if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2914                 /* if vif isn't initialized mvm doesn't know about
2915                  * this station, so don't do anything with the it
2916                  */
2917                 sta = NULL;
2918                 mvm_sta = NULL;
2919         }
2920
2921         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2922
2923         /* Treat uninitialized rate scaling data same as non-existing. */
2924         if (lq_sta && !lq_sta->pers.drv) {
2925                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2926                 mvm_sta = NULL;
2927         }
2928
2929         /* Send management frames and NO_ACK data using lowest rate. */
2930         if (rate_control_send_low(sta, mvm_sta, txrc))
2931                 return;
2932
2933         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2934                                   info->band, &info->control.rates[0]);
2935         info->control.rates[0].count = 1;
2936
2937         /* Report the optimal rate based on rssi and STA caps if we haven't
2938          * converged yet (too little traffic) or exploring other modulations
2939          */
2940         if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2941                 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2942                 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2943                                                           optimal_rate);
2944                 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2945                                           &txrc->reported_rate);
2946         }
2947 }
2948
2949 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2950                           gfp_t gfp)
2951 {
2952         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2953         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2954         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2955         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2956
2957         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2958
2959         lq_sta->pers.drv = mvm;
2960 #ifdef CONFIG_MAC80211_DEBUGFS
2961         lq_sta->pers.dbg_fixed_rate = 0;
2962         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2963         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2964 #endif
2965         lq_sta->pers.chains = 0;
2966         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2967         lq_sta->pers.last_rssi = S8_MIN;
2968
2969         return &sta_priv->lq_sta;
2970 }
2971
2972 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2973                                        int nss)
2974 {
2975         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2976                 (0x3 << (2 * (nss - 1)));
2977         rx_mcs >>= (2 * (nss - 1));
2978
2979         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2980                 return IWL_RATE_MCS_7_INDEX;
2981         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2982                 return IWL_RATE_MCS_8_INDEX;
2983         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2984                 return IWL_RATE_MCS_9_INDEX;
2985
2986         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2987         return -1;
2988 }
2989
2990 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2991                                      struct ieee80211_sta_vht_cap *vht_cap,
2992                                      struct iwl_lq_sta *lq_sta)
2993 {
2994         int i;
2995         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2996
2997         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2998                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2999                         if (i == IWL_RATE_9M_INDEX)
3000                                 continue;
3001
3002                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
3003                         if (i == IWL_RATE_MCS_9_INDEX &&
3004                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
3005                                 continue;
3006
3007                         lq_sta->active_siso_rate |= BIT(i);
3008                 }
3009         }
3010
3011         if (sta->rx_nss < 2)
3012                 return;
3013
3014         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
3015         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
3016                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
3017                         if (i == IWL_RATE_9M_INDEX)
3018                                 continue;
3019
3020                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
3021                         if (i == IWL_RATE_MCS_9_INDEX &&
3022                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
3023                                 continue;
3024
3025                         lq_sta->active_mimo2_rate |= BIT(i);
3026                 }
3027         }
3028 }
3029
3030 static void rs_ht_init(struct iwl_mvm *mvm,
3031                        struct ieee80211_sta *sta,
3032                        struct iwl_lq_sta *lq_sta,
3033                        struct ieee80211_sta_ht_cap *ht_cap)
3034 {
3035         /* active_siso_rate mask includes 9 MBits (bit 5),
3036          * and CCK (bits 0-3), supp_rates[] does not;
3037          * shift to convert format, force 9 MBits off.
3038          */
3039         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
3040         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
3041         lq_sta->active_siso_rate &= ~((u16)0x2);
3042         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
3043
3044         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
3045         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
3046         lq_sta->active_mimo2_rate &= ~((u16)0x2);
3047         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
3048
3049         if (mvm->cfg->ht_params->ldpc &&
3050             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
3051                 lq_sta->ldpc = true;
3052
3053         if (mvm->cfg->ht_params->stbc &&
3054             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3055             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3056                 lq_sta->stbc_capable = true;
3057
3058         lq_sta->is_vht = false;
3059 }
3060
3061 static void rs_vht_init(struct iwl_mvm *mvm,
3062                         struct ieee80211_sta *sta,
3063                         struct iwl_lq_sta *lq_sta,
3064                         struct ieee80211_sta_vht_cap *vht_cap)
3065 {
3066         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
3067
3068         if (mvm->cfg->ht_params->ldpc &&
3069             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3070                 lq_sta->ldpc = true;
3071
3072         if (mvm->cfg->ht_params->stbc &&
3073             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3074             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3075                 lq_sta->stbc_capable = true;
3076
3077         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3078             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3079             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3080                 lq_sta->bfer_capable = true;
3081
3082         lq_sta->is_vht = true;
3083 }
3084
3085 #ifdef CONFIG_IWLWIFI_DEBUGFS
3086 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3087 {
3088         spin_lock_bh(&mvm->drv_stats_lock);
3089         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3090         spin_unlock_bh(&mvm->drv_stats_lock);
3091 }
3092
3093 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3094 {
3095         u8 nss = 0, mcs = 0;
3096
3097         spin_lock(&mvm->drv_stats_lock);
3098
3099         if (agg)
3100                 mvm->drv_rx_stats.agg_frames++;
3101
3102         mvm->drv_rx_stats.success_frames++;
3103
3104         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3105         case RATE_MCS_CHAN_WIDTH_20:
3106                 mvm->drv_rx_stats.bw_20_frames++;
3107                 break;
3108         case RATE_MCS_CHAN_WIDTH_40:
3109                 mvm->drv_rx_stats.bw_40_frames++;
3110                 break;
3111         case RATE_MCS_CHAN_WIDTH_80:
3112                 mvm->drv_rx_stats.bw_80_frames++;
3113                 break;
3114         case RATE_MCS_CHAN_WIDTH_160:
3115                 mvm->drv_rx_stats.bw_160_frames++;
3116                 break;
3117         default:
3118                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3119         }
3120
3121         if (rate & RATE_MCS_HT_MSK) {
3122                 mvm->drv_rx_stats.ht_frames++;
3123                 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
3124                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3125         } else if (rate & RATE_MCS_VHT_MSK) {
3126                 mvm->drv_rx_stats.vht_frames++;
3127                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3128                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3129                        RATE_VHT_MCS_NSS_POS) + 1;
3130         } else {
3131                 mvm->drv_rx_stats.legacy_frames++;
3132         }
3133
3134         if (nss == 1)
3135                 mvm->drv_rx_stats.siso_frames++;
3136         else if (nss == 2)
3137                 mvm->drv_rx_stats.mimo2_frames++;
3138
3139         if (rate & RATE_MCS_SGI_MSK)
3140                 mvm->drv_rx_stats.sgi_frames++;
3141         else
3142                 mvm->drv_rx_stats.ngi_frames++;
3143
3144         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3145         mvm->drv_rx_stats.last_frame_idx =
3146                 (mvm->drv_rx_stats.last_frame_idx + 1) %
3147                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3148
3149         spin_unlock(&mvm->drv_stats_lock);
3150 }
3151 #endif
3152
3153 /*
3154  * Called after adding a new station to initialize rate scaling
3155  */
3156 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3157                           enum nl80211_band band, bool init)
3158 {
3159         int i, j;
3160         struct ieee80211_hw *hw = mvm->hw;
3161         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3162         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3163         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
3164         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
3165         struct ieee80211_supported_band *sband;
3166         unsigned long supp; /* must be unsigned long for for_each_set_bit */
3167
3168         /* clear all non-persistent lq data */
3169         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3170
3171         sband = hw->wiphy->bands[band];
3172
3173         lq_sta->lq.sta_id = sta_priv->sta_id;
3174         sta_priv->tlc_amsdu = false;
3175
3176         for (j = 0; j < LQ_SIZE; j++)
3177                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3178
3179         lq_sta->flush_timer = 0;
3180         lq_sta->last_tx = jiffies;
3181
3182         IWL_DEBUG_RATE(mvm,
3183                        "LQ: *** rate scale station global init for station %d ***\n",
3184                        sta_priv->sta_id);
3185         /* TODO: what is a good starting rate for STA? About middle? Maybe not
3186          * the lowest or the highest rate.. Could consider using RSSI from
3187          * previous packets? Need to have IEEE 802.1X auth succeed immediately
3188          * after assoc.. */
3189
3190         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3191         lq_sta->band = sband->band;
3192         /*
3193          * active legacy rates as per supported rates bitmap
3194          */
3195         supp = sta->supp_rates[sband->band];
3196         lq_sta->active_legacy_rate = 0;
3197         for_each_set_bit(i, &supp, BITS_PER_LONG)
3198                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3199
3200         /* TODO: should probably account for rx_highest for both HT/VHT */
3201         if (!vht_cap || !vht_cap->vht_supported)
3202                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3203         else
3204                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3205
3206         lq_sta->max_legacy_rate_idx =
3207                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3208         lq_sta->max_siso_rate_idx =
3209                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3210         lq_sta->max_mimo2_rate_idx =
3211                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3212
3213         IWL_DEBUG_RATE(mvm,
3214                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3215                        lq_sta->active_legacy_rate,
3216                        lq_sta->active_siso_rate,
3217                        lq_sta->active_mimo2_rate,
3218                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3219                        lq_sta->bfer_capable);
3220         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3221                        lq_sta->max_legacy_rate_idx,
3222                        lq_sta->max_siso_rate_idx,
3223                        lq_sta->max_mimo2_rate_idx);
3224
3225         /* These values will be overridden later */
3226         lq_sta->lq.single_stream_ant_msk =
3227                 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3228         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3229
3230         /* as default allow aggregation for all tids */
3231         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3232         lq_sta->is_agg = 0;
3233 #ifdef CONFIG_IWLWIFI_DEBUGFS
3234         iwl_mvm_reset_frame_stats(mvm);
3235 #endif
3236         rs_initialize_lq(mvm, sta, lq_sta, band, init);
3237 }
3238
3239 static void rs_rate_update(void *mvm_r,
3240                            struct ieee80211_supported_band *sband,
3241                            struct cfg80211_chan_def *chandef,
3242                            struct ieee80211_sta *sta, void *priv_sta,
3243                            u32 changed)
3244 {
3245         u8 tid;
3246         struct iwl_op_mode *op_mode  =
3247                         (struct iwl_op_mode *)mvm_r;
3248         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3249
3250         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3251                 return;
3252
3253         /* Stop any ongoing aggregations as rs starts off assuming no agg */
3254         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3255                 ieee80211_stop_tx_ba_session(sta, tid);
3256
3257         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3258 }
3259
3260 #ifdef CONFIG_MAC80211_DEBUGFS
3261 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3262                                             struct iwl_lq_cmd *lq_cmd,
3263                                             enum nl80211_band band,
3264                                             u32 ucode_rate)
3265 {
3266         struct rs_rate rate;
3267         int i;
3268         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3269         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3270         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3271
3272         for (i = 0; i < num_rates; i++)
3273                 lq_cmd->rs_table[i] = ucode_rate_le32;
3274
3275         if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3276                 WARN_ON_ONCE(1);
3277                 return;
3278         }
3279
3280         if (is_mimo(&rate))
3281                 lq_cmd->mimo_delim = num_rates - 1;
3282         else
3283                 lq_cmd->mimo_delim = 0;
3284
3285         lq_cmd->reduced_tpc = 0;
3286
3287         if (num_of_ant(ant) == 1)
3288                 lq_cmd->single_stream_ant_msk = ant;
3289
3290         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3291 }
3292 #endif /* CONFIG_MAC80211_DEBUGFS */
3293
3294 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3295                                      struct iwl_lq_sta *lq_sta,
3296                                      struct rs_rate *rate,
3297                                      __le32 *rs_table, int *rs_table_index,
3298                                      int num_rates, int num_retries,
3299                                      u8 valid_tx_ant, bool toggle_ant)
3300 {
3301         int i, j;
3302         __le32 ucode_rate;
3303         bool bottom_reached = false;
3304         int prev_rate_idx = rate->index;
3305         int end = LINK_QUAL_MAX_RETRY_NUM;
3306         int index = *rs_table_index;
3307
3308         for (i = 0; i < num_rates && index < end; i++) {
3309                 for (j = 0; j < num_retries && index < end; j++, index++) {
3310                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3311                                                                          rate));
3312                         rs_table[index] = ucode_rate;
3313                         if (toggle_ant)
3314                                 rs_toggle_antenna(valid_tx_ant, rate);
3315                 }
3316
3317                 prev_rate_idx = rate->index;
3318                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3319                 if (bottom_reached && !is_legacy(rate))
3320                         break;
3321         }
3322
3323         if (!bottom_reached && !is_legacy(rate))
3324                 rate->index = prev_rate_idx;
3325
3326         *rs_table_index = index;
3327 }
3328
3329 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3330  * column the rate table should look like this:
3331  *
3332  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3333  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3334  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3335  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3336  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3337  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3338  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3339  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3340  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3341  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3342  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3343  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3344  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3345  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3346  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3347  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3348  */
3349 static void rs_build_rates_table(struct iwl_mvm *mvm,
3350                                  struct ieee80211_sta *sta,
3351                                  struct iwl_lq_sta *lq_sta,
3352                                  const struct rs_rate *initial_rate)
3353 {
3354         struct rs_rate rate;
3355         int num_rates, num_retries, index = 0;
3356         u8 valid_tx_ant = 0;
3357         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3358         bool toggle_ant = false;
3359
3360         memcpy(&rate, initial_rate, sizeof(rate));
3361
3362         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3363
3364         /* TODO: remove old API when min FW API hits 14 */
3365         if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3366             rs_stbc_allow(mvm, sta, lq_sta))
3367                 rate.stbc = true;
3368
3369         if (is_siso(&rate)) {
3370                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3371                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3372         } else if (is_mimo(&rate)) {
3373                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3374                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3375         } else {
3376                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3377                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3378                 toggle_ant = true;
3379         }
3380
3381         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3382                                  num_rates, num_retries, valid_tx_ant,
3383                                  toggle_ant);
3384
3385         rs_get_lower_rate_down_column(lq_sta, &rate);
3386
3387         if (is_siso(&rate)) {
3388                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3389                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3390                 lq_cmd->mimo_delim = index;
3391         } else if (is_legacy(&rate)) {
3392                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3393                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3394         } else {
3395                 WARN_ON_ONCE(1);
3396         }
3397
3398         toggle_ant = true;
3399
3400         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3401                                  num_rates, num_retries, valid_tx_ant,
3402                                  toggle_ant);
3403
3404         rs_get_lower_rate_down_column(lq_sta, &rate);
3405
3406         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3407         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3408
3409         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3410                                  num_rates, num_retries, valid_tx_ant,
3411                                  toggle_ant);
3412
3413 }
3414
3415 struct rs_bfer_active_iter_data {
3416         struct ieee80211_sta *exclude_sta;
3417         struct iwl_mvm_sta *bfer_mvmsta;
3418 };
3419
3420 static void rs_bfer_active_iter(void *_data,
3421                                 struct ieee80211_sta *sta)
3422 {
3423         struct rs_bfer_active_iter_data *data = _data;
3424         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3425         struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3426         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3427
3428         if (sta == data->exclude_sta)
3429                 return;
3430
3431         /* The current sta has BFER allowed */
3432         if (ss_params & LQ_SS_BFER_ALLOWED) {
3433                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3434
3435                 data->bfer_mvmsta = mvmsta;
3436         }
3437 }
3438
3439 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3440 {
3441         int prio = -1;
3442         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3443
3444         switch (viftype) {
3445         case NL80211_IFTYPE_AP:
3446         case NL80211_IFTYPE_P2P_GO:
3447                 prio = 3;
3448                 break;
3449         case NL80211_IFTYPE_P2P_CLIENT:
3450                 prio = 2;
3451                 break;
3452         case NL80211_IFTYPE_STATION:
3453                 prio = 1;
3454                 break;
3455         default:
3456                 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3457                 prio = -1;
3458         }
3459
3460         return prio;
3461 }
3462
3463 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3464 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3465                                 struct iwl_mvm_sta *sta2)
3466 {
3467         int prio1 = rs_bfer_priority(sta1);
3468         int prio2 = rs_bfer_priority(sta2);
3469
3470         if (prio1 > prio2)
3471                 return 1;
3472         if (prio1 < prio2)
3473                 return -1;
3474         return 0;
3475 }
3476
3477 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3478                                 struct ieee80211_sta *sta,
3479                                 struct iwl_lq_sta *lq_sta,
3480                                 const struct rs_rate *initial_rate)
3481 {
3482         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3483         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3484         struct rs_bfer_active_iter_data data = {
3485                 .exclude_sta = sta,
3486                 .bfer_mvmsta = NULL,
3487         };
3488         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3489         u32 ss_params = LQ_SS_PARAMS_VALID;
3490
3491         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3492                 goto out;
3493
3494 #ifdef CONFIG_MAC80211_DEBUGFS
3495         /* Check if forcing the decision is configured.
3496          * Note that SISO is forced by not allowing STBC or BFER
3497          */
3498         if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3499                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3500         else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3501                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3502
3503         if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3504                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3505                                lq_sta->pers.ss_force);
3506                 goto out;
3507         }
3508 #endif
3509
3510         if (lq_sta->stbc_capable)
3511                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3512
3513         if (!lq_sta->bfer_capable)
3514                 goto out;
3515
3516         ieee80211_iterate_stations_atomic(mvm->hw,
3517                                           rs_bfer_active_iter,
3518                                           &data);
3519         bfer_mvmsta = data.bfer_mvmsta;
3520
3521         /* This code is safe as it doesn't run concurrently for different
3522          * stations. This is guaranteed by the fact that calls to
3523          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3524          */
3525         if (!bfer_mvmsta) {
3526                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3527
3528                 ss_params |= LQ_SS_BFER_ALLOWED;
3529                 goto out;
3530         }
3531
3532         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3533                        bfer_mvmsta->sta_id);
3534
3535         /* Disallow BFER on another STA if active and we're a higher priority */
3536         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3537                 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3538                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3539
3540                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3541                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3542                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3543
3544                 ss_params |= LQ_SS_BFER_ALLOWED;
3545                 IWL_DEBUG_RATE(mvm,
3546                                "Lower priority BFER sta found (%d). Switch BFER\n",
3547                                bfer_mvmsta->sta_id);
3548         }
3549 out:
3550         lq_cmd->ss_params = cpu_to_le32(ss_params);
3551 }
3552
3553 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3554                            struct ieee80211_sta *sta,
3555                            struct iwl_lq_sta *lq_sta,
3556                            const struct rs_rate *initial_rate)
3557 {
3558         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3559         struct iwl_mvm_sta *mvmsta;
3560         struct iwl_mvm_vif *mvmvif;
3561
3562         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3563         lq_cmd->agg_time_limit =
3564                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3565
3566 #ifdef CONFIG_MAC80211_DEBUGFS
3567         if (lq_sta->pers.dbg_fixed_rate) {
3568                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3569                                                 lq_sta->band,
3570                                                 lq_sta->pers.dbg_fixed_rate);
3571                 return;
3572         }
3573 #endif
3574         if (WARN_ON_ONCE(!sta || !initial_rate))
3575                 return;
3576
3577         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3578
3579         if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3580                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3581
3582         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3583         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3584
3585         if (num_of_ant(initial_rate->ant) == 1)
3586                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3587
3588         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3589
3590         /*
3591          * In case of low latency, tell the firmware to leave a frame in the
3592          * Tx Fifo so that it can start a transaction in the same TxOP. This
3593          * basically allows the firmware to send bursts.
3594          */
3595         if (iwl_mvm_vif_low_latency(mvmvif))
3596                 lq_cmd->agg_frame_cnt_limit--;
3597
3598         if (mvmsta->vif->p2p)
3599                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3600
3601         lq_cmd->agg_time_limit =
3602                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3603 }
3604
3605 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3606 {
3607         return hw->priv;
3608 }
3609 /* rate scale requires free function to be implemented */
3610 static void rs_free(void *mvm_rate)
3611 {
3612         return;
3613 }
3614
3615 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3616                         void *mvm_sta)
3617 {
3618         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3619         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3620
3621         IWL_DEBUG_RATE(mvm, "enter\n");
3622         IWL_DEBUG_RATE(mvm, "leave\n");
3623 }
3624
3625 #ifdef CONFIG_MAC80211_DEBUGFS
3626 int rs_pretty_print_rate(char *buf, const u32 rate)
3627 {
3628
3629         char *type, *bw;
3630         u8 mcs = 0, nss = 0;
3631         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3632
3633         if (!(rate & RATE_MCS_HT_MSK) &&
3634             !(rate & RATE_MCS_VHT_MSK)) {
3635                 int index = iwl_hwrate_to_plcp_idx(rate);
3636
3637                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3638                                rs_pretty_ant(ant),
3639                                index == IWL_RATE_INVALID ? "BAD" :
3640                                iwl_rate_mcs[index].mbps);
3641         }
3642
3643         if (rate & RATE_MCS_VHT_MSK) {
3644                 type = "VHT";
3645                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3646                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3647                        >> RATE_VHT_MCS_NSS_POS) + 1;
3648         } else if (rate & RATE_MCS_HT_MSK) {
3649                 type = "HT";
3650                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3651         } else {
3652                 type = "Unknown"; /* shouldn't happen */
3653         }
3654
3655         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3656         case RATE_MCS_CHAN_WIDTH_20:
3657                 bw = "20Mhz";
3658                 break;
3659         case RATE_MCS_CHAN_WIDTH_40:
3660                 bw = "40Mhz";
3661                 break;
3662         case RATE_MCS_CHAN_WIDTH_80:
3663                 bw = "80Mhz";
3664                 break;
3665         case RATE_MCS_CHAN_WIDTH_160:
3666                 bw = "160Mhz";
3667                 break;
3668         default:
3669                 bw = "BAD BW";
3670         }
3671
3672         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3673                        type, rs_pretty_ant(ant), bw, mcs, nss,
3674                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3675                        (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3676                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3677                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3678                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3679 }
3680
3681 /**
3682  * Program the device to use fixed rate for frame transmit
3683  * This is for debugging/testing only
3684  * once the device start use fixed rate, we need to reload the module
3685  * to being back the normal operation.
3686  */
3687 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3688                                 struct iwl_lq_sta *lq_sta)
3689 {
3690         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3691         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3692         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3693
3694         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3695                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3696
3697         if (lq_sta->pers.dbg_fixed_rate) {
3698                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3699                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3700         }
3701 }
3702
3703 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3704                         const char __user *user_buf, size_t count, loff_t *ppos)
3705 {
3706         struct iwl_lq_sta *lq_sta = file->private_data;
3707         struct iwl_mvm *mvm;
3708         char buf[64];
3709         size_t buf_size;
3710         u32 parsed_rate;
3711
3712         mvm = lq_sta->pers.drv;
3713         memset(buf, 0, sizeof(buf));
3714         buf_size = min(count, sizeof(buf) -  1);
3715         if (copy_from_user(buf, user_buf, buf_size))
3716                 return -EFAULT;
3717
3718         if (sscanf(buf, "%x", &parsed_rate) == 1)
3719                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3720         else
3721                 lq_sta->pers.dbg_fixed_rate = 0;
3722
3723         rs_program_fix_rate(mvm, lq_sta);
3724
3725         return count;
3726 }
3727
3728 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3729                         char __user *user_buf, size_t count, loff_t *ppos)
3730 {
3731         char *buff;
3732         int desc = 0;
3733         int i = 0;
3734         ssize_t ret;
3735
3736         struct iwl_lq_sta *lq_sta = file->private_data;
3737         struct iwl_mvm_sta *mvmsta =
3738                 container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3739         struct iwl_mvm *mvm;
3740         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3741         struct rs_rate *rate = &tbl->rate;
3742         u32 ss_params;
3743
3744         mvm = lq_sta->pers.drv;
3745         buff = kmalloc(2048, GFP_KERNEL);
3746         if (!buff)
3747                 return -ENOMEM;
3748
3749         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3750         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3751                         lq_sta->total_failed, lq_sta->total_success,
3752                         lq_sta->active_legacy_rate);
3753         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3754                         lq_sta->pers.dbg_fixed_rate);
3755         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3756             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3757             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3758             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3759         desc += sprintf(buff+desc, "lq type %s\n",
3760                         (is_legacy(rate)) ? "legacy" :
3761                         is_vht(rate) ? "VHT" : "HT");
3762         if (!is_legacy(rate)) {
3763                 desc += sprintf(buff + desc, " %s",
3764                    (is_siso(rate)) ? "SISO" : "MIMO2");
3765                 desc += sprintf(buff + desc, " %s",
3766                                 (is_ht20(rate)) ? "20MHz" :
3767                                 (is_ht40(rate)) ? "40MHz" :
3768                                 (is_ht80(rate)) ? "80MHz" :
3769                                 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3770                 desc += sprintf(buff + desc, " %s %s %s %s\n",
3771                                 (rate->sgi) ? "SGI" : "NGI",
3772                                 (rate->ldpc) ? "LDPC" : "BCC",
3773                                 (lq_sta->is_agg) ? "AGG on" : "",
3774                                 (mvmsta->tlc_amsdu) ? "AMSDU on" : "");
3775         }
3776         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3777                         lq_sta->last_rate_n_flags);
3778         desc += sprintf(buff+desc,
3779                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3780                         lq_sta->lq.flags,
3781                         lq_sta->lq.mimo_delim,
3782                         lq_sta->lq.single_stream_ant_msk,
3783                         lq_sta->lq.dual_stream_ant_msk);
3784
3785         desc += sprintf(buff+desc,
3786                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3787                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3788                         lq_sta->lq.agg_disable_start_th,
3789                         lq_sta->lq.agg_frame_cnt_limit);
3790
3791         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3792         ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3793         desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3794                         (ss_params & LQ_SS_PARAMS_VALID) ?
3795                         "VALID" : "INVALID",
3796                         (ss_params & LQ_SS_BFER_ALLOWED) ?
3797                         ", BFER" : "",
3798                         (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3799                         ", STBC" : "",
3800                         (ss_params & LQ_SS_FORCE) ?
3801                         ", FORCE" : "");
3802         desc += sprintf(buff+desc,
3803                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3804                         lq_sta->lq.initial_rate_index[0],
3805                         lq_sta->lq.initial_rate_index[1],
3806                         lq_sta->lq.initial_rate_index[2],
3807                         lq_sta->lq.initial_rate_index[3]);
3808
3809         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3810                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3811
3812                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3813                 desc += rs_pretty_print_rate(buff+desc, r);
3814         }
3815
3816         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3817         kfree(buff);
3818         return ret;
3819 }
3820
3821 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3822         .write = rs_sta_dbgfs_scale_table_write,
3823         .read = rs_sta_dbgfs_scale_table_read,
3824         .open = simple_open,
3825         .llseek = default_llseek,
3826 };
3827 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3828                         char __user *user_buf, size_t count, loff_t *ppos)
3829 {
3830         char *buff;
3831         int desc = 0;
3832         int i, j;
3833         ssize_t ret;
3834         struct iwl_scale_tbl_info *tbl;
3835         struct rs_rate *rate;
3836         struct iwl_lq_sta *lq_sta = file->private_data;
3837
3838         buff = kmalloc(1024, GFP_KERNEL);
3839         if (!buff)
3840                 return -ENOMEM;
3841
3842         for (i = 0; i < LQ_SIZE; i++) {
3843                 tbl = &(lq_sta->lq_info[i]);
3844                 rate = &tbl->rate;
3845                 desc += sprintf(buff+desc,
3846                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3847                                 "index=%d\n",
3848                                 lq_sta->active_tbl == i ? "*" : "x",
3849                                 rate->type,
3850                                 rate->sgi,
3851                                 is_ht20(rate) ? "20MHz" :
3852                                 is_ht40(rate) ? "40MHz" :
3853                                 is_ht80(rate) ? "80MHz" :
3854                                 is_ht160(rate) ? "160MHz" : "ERR",
3855                                 rate->index);
3856                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3857                         desc += sprintf(buff+desc,
3858                                 "counter=%d success=%d %%=%d\n",
3859                                 tbl->win[j].counter,
3860                                 tbl->win[j].success_counter,
3861                                 tbl->win[j].success_ratio);
3862                 }
3863         }
3864         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3865         kfree(buff);
3866         return ret;
3867 }
3868
3869 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3870         .read = rs_sta_dbgfs_stats_table_read,
3871         .open = simple_open,
3872         .llseek = default_llseek,
3873 };
3874
3875 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3876                                               char __user *user_buf,
3877                                               size_t count, loff_t *ppos)
3878 {
3879         static const char * const column_name[] = {
3880                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3881                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3882                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3883                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3884                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3885                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3886                 [RS_COLUMN_MIMO2] = "MIMO2",
3887                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3888         };
3889
3890         static const char * const rate_name[] = {
3891                 [IWL_RATE_1M_INDEX] = "1M",
3892                 [IWL_RATE_2M_INDEX] = "2M",
3893                 [IWL_RATE_5M_INDEX] = "5.5M",
3894                 [IWL_RATE_11M_INDEX] = "11M",
3895                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3896                 [IWL_RATE_9M_INDEX] = "9M",
3897                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3898                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3899                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3900                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3901                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3902                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3903                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3904                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3905                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3906         };
3907
3908         char *buff, *pos, *endpos;
3909         int col, rate;
3910         ssize_t ret;
3911         struct iwl_lq_sta *lq_sta = file->private_data;
3912         struct rs_rate_stats *stats;
3913         static const size_t bufsz = 1024;
3914
3915         buff = kmalloc(bufsz, GFP_KERNEL);
3916         if (!buff)
3917                 return -ENOMEM;
3918
3919         pos = buff;
3920         endpos = pos + bufsz;
3921
3922         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3923         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3924                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3925         pos += scnprintf(pos, endpos - pos, "\n");
3926
3927         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3928                 pos += scnprintf(pos, endpos - pos,
3929                                  "%s,", column_name[col]);
3930
3931                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3932                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3933                         pos += scnprintf(pos, endpos - pos,
3934                                          "%llu/%llu,",
3935                                          stats->success,
3936                                          stats->total);
3937                 }
3938                 pos += scnprintf(pos, endpos - pos, "\n");
3939         }
3940
3941         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3942         kfree(buff);
3943         return ret;
3944 }
3945
3946 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3947                                                const char __user *user_buf,
3948                                                size_t count, loff_t *ppos)
3949 {
3950         struct iwl_lq_sta *lq_sta = file->private_data;
3951         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3952
3953         return count;
3954 }
3955
3956 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3957         .read = rs_sta_dbgfs_drv_tx_stats_read,
3958         .write = rs_sta_dbgfs_drv_tx_stats_write,
3959         .open = simple_open,
3960         .llseek = default_llseek,
3961 };
3962
3963 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3964                                        char __user *user_buf,
3965                                        size_t count, loff_t *ppos)
3966 {
3967         struct iwl_lq_sta *lq_sta = file->private_data;
3968         char buf[12];
3969         int bufsz = sizeof(buf);
3970         int pos = 0;
3971         static const char * const ss_force_name[] = {
3972                 [RS_SS_FORCE_NONE] = "none",
3973                 [RS_SS_FORCE_STBC] = "stbc",
3974                 [RS_SS_FORCE_BFER] = "bfer",
3975                 [RS_SS_FORCE_SISO] = "siso",
3976         };
3977
3978         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3979                          ss_force_name[lq_sta->pers.ss_force]);
3980         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3981 }
3982
3983 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3984                                         size_t count, loff_t *ppos)
3985 {
3986         struct iwl_mvm *mvm = lq_sta->pers.drv;
3987         int ret = 0;
3988
3989         if (!strncmp("none", buf, 4)) {
3990                 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3991         } else if (!strncmp("siso", buf, 4)) {
3992                 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3993         } else if (!strncmp("stbc", buf, 4)) {
3994                 if (lq_sta->stbc_capable) {
3995                         lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3996                 } else {
3997                         IWL_ERR(mvm,
3998                                 "can't force STBC. peer doesn't support\n");
3999                         ret = -EINVAL;
4000                 }
4001         } else if (!strncmp("bfer", buf, 4)) {
4002                 if (lq_sta->bfer_capable) {
4003                         lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4004                 } else {
4005                         IWL_ERR(mvm,
4006                                 "can't force BFER. peer doesn't support\n");
4007                         ret = -EINVAL;
4008                 }
4009         } else {
4010                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4011                 ret = -EINVAL;
4012         }
4013         return ret ?: count;
4014 }
4015
4016 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4017         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4018 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
4019                 if (!debugfs_create_file(#name, mode, parent, lq_sta,   \
4020                                          &iwl_dbgfs_##name##_ops))      \
4021                         goto err;                                       \
4022         } while (0)
4023
4024 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4025
4026 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
4027 {
4028         struct iwl_lq_sta *lq_sta = priv_sta;
4029         struct iwl_mvm_sta *mvmsta;
4030
4031         mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
4032
4033         if (!mvmsta->vif)
4034                 return;
4035
4036         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
4037                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
4038         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
4039                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
4040         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
4041                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4042         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
4043                           &lq_sta->tx_agg_tid_en);
4044         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
4045                           &lq_sta->pers.dbg_fixed_txp_reduction);
4046
4047         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
4048         return;
4049 err:
4050         IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
4051 }
4052
4053 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
4054 {
4055 }
4056 #endif
4057
4058 /*
4059  * Initialization of rate scaling information is done by driver after
4060  * the station is added. Since mac80211 calls this function before a
4061  * station is added we ignore it.
4062  */
4063 static void rs_rate_init_stub(void *mvm_r,
4064                               struct ieee80211_supported_band *sband,
4065                               struct cfg80211_chan_def *chandef,
4066                               struct ieee80211_sta *sta, void *mvm_sta)
4067 {
4068 }
4069
4070 static const struct rate_control_ops rs_mvm_ops = {
4071         .name = RS_NAME,
4072         .tx_status = rs_mac80211_tx_status,
4073         .get_rate = rs_get_rate,
4074         .rate_init = rs_rate_init_stub,
4075         .alloc = rs_alloc,
4076         .free = rs_free,
4077         .alloc_sta = rs_alloc_sta,
4078         .free_sta = rs_free_sta,
4079         .rate_update = rs_rate_update,
4080 #ifdef CONFIG_MAC80211_DEBUGFS
4081         .add_sta_debugfs = rs_add_debugfs,
4082         .remove_sta_debugfs = rs_remove_debugfs,
4083 #endif
4084 };
4085
4086 int iwl_mvm_rate_control_register(void)
4087 {
4088         return ieee80211_rate_control_register(&rs_mvm_ops);
4089 }
4090
4091 void iwl_mvm_rate_control_unregister(void)
4092 {
4093         ieee80211_rate_control_unregister(&rs_mvm_ops);
4094 }
4095
4096 /**
4097  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
4098  * Tx protection, according to this request and previous requests,
4099  * and send the LQ command.
4100  * @mvmsta: The station
4101  * @enable: Enable Tx protection?
4102  */
4103 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4104                           bool enable)
4105 {
4106         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
4107
4108         lockdep_assert_held(&mvm->mutex);
4109
4110         if (enable) {
4111                 if (mvmsta->tx_protection == 0)
4112                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
4113                 mvmsta->tx_protection++;
4114         } else {
4115                 mvmsta->tx_protection--;
4116                 if (mvmsta->tx_protection == 0)
4117                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4118         }
4119
4120         return iwl_mvm_send_lq_cmd(mvm, lq, false);
4121 }