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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
   4  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
   5  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  * The full GNU General Public License is included in this distribution in the
  21  * file called LICENSE.
  22  *
  23  * Contact Information:
  24  *  Intel Linux Wireless <linuxwifi@intel.com>
  25  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26  *
  27  *****************************************************************************/
  28 #include <linux/kernel.h>
  29 #include <linux/skbuff.h>
  30 #include <linux/slab.h>
  31 #include <net/mac80211.h>
  32
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/delay.h>
  36
  37 #include <linux/workqueue.h>
  38 #include "rs.h"
  39 #include "fw-api.h"
  40 #include "sta.h"
  41 #include "iwl-op-mode.h"
  42 #include "mvm.h"
  43 #include "debugfs.h"
  44
  45 #define 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         if (!sta->ht_cap.ht_supported)
 165                 return false;
 166
 167         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 168                 return false;
 169
 170         if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
 171                 return false;
 172
 173         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 174                 return false;
 175
 176         if (mvm->nvm_data->sku_cap_mimo_disabled)
 177                 return false;
 178
 179         return true;
 180 }
 181
 182 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 183                           struct rs_rate *rate,
 184                           const struct rs_tx_column *next_col)
 185 {
 186         if (!sta->ht_cap.ht_supported)
 187                 return false;
 188
 189         return true;
 190 }
 191
 192 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 193                          struct rs_rate *rate,
 194                          const struct rs_tx_column *next_col)
 195 {
 196         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 197         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 198
 199         if (is_ht20(rate) && (ht_cap->cap &
 200                              IEEE80211_HT_CAP_SGI_20))
 201                 return true;
 202         if (is_ht40(rate) && (ht_cap->cap &
 203                              IEEE80211_HT_CAP_SGI_40))
 204                 return true;
 205         if (is_ht80(rate) && (vht_cap->cap &
 206                              IEEE80211_VHT_CAP_SHORT_GI_80))
 207                 return true;
 208         if (is_ht160(rate) && (vht_cap->cap &
 209                              IEEE80211_VHT_CAP_SHORT_GI_160))
 210                 return true;
 211
 212         return false;
 213 }
 214
 215 static const struct rs_tx_column rs_tx_columns[] = {
 216         [RS_COLUMN_LEGACY_ANT_A] = {
 217                 .mode = RS_LEGACY,
 218                 .ant = ANT_A,
 219                 .next_columns = {
 220                         RS_COLUMN_LEGACY_ANT_B,
 221                         RS_COLUMN_SISO_ANT_A,
 222                         RS_COLUMN_MIMO2,
 223                         RS_COLUMN_INVALID,
 224                         RS_COLUMN_INVALID,
 225                         RS_COLUMN_INVALID,
 226                         RS_COLUMN_INVALID,
 227                 },
 228                 .checks = {
 229                         rs_ant_allow,
 230                 },
 231         },
 232         [RS_COLUMN_LEGACY_ANT_B] = {
 233                 .mode = RS_LEGACY,
 234                 .ant = ANT_B,
 235                 .next_columns = {
 236                         RS_COLUMN_LEGACY_ANT_A,
 237                         RS_COLUMN_SISO_ANT_B,
 238                         RS_COLUMN_MIMO2,
 239                         RS_COLUMN_INVALID,
 240                         RS_COLUMN_INVALID,
 241                         RS_COLUMN_INVALID,
 242                         RS_COLUMN_INVALID,
 243                 },
 244                 .checks = {
 245                         rs_ant_allow,
 246                 },
 247         },
 248         [RS_COLUMN_SISO_ANT_A] = {
 249                 .mode = RS_SISO,
 250                 .ant = ANT_A,
 251                 .next_columns = {
 252                         RS_COLUMN_SISO_ANT_B,
 253                         RS_COLUMN_MIMO2,
 254                         RS_COLUMN_SISO_ANT_A_SGI,
 255                         RS_COLUMN_LEGACY_ANT_A,
 256                         RS_COLUMN_LEGACY_ANT_B,
 257                         RS_COLUMN_INVALID,
 258                         RS_COLUMN_INVALID,
 259                 },
 260                 .checks = {
 261                         rs_siso_allow,
 262                         rs_ant_allow,
 263                 },
 264         },
 265         [RS_COLUMN_SISO_ANT_B] = {
 266                 .mode = RS_SISO,
 267                 .ant = ANT_B,
 268                 .next_columns = {
 269                         RS_COLUMN_SISO_ANT_A,
 270                         RS_COLUMN_MIMO2,
 271                         RS_COLUMN_SISO_ANT_B_SGI,
 272                         RS_COLUMN_LEGACY_ANT_A,
 273                         RS_COLUMN_LEGACY_ANT_B,
 274                         RS_COLUMN_INVALID,
 275                         RS_COLUMN_INVALID,
 276                 },
 277                 .checks = {
 278                         rs_siso_allow,
 279                         rs_ant_allow,
 280                 },
 281         },
 282         [RS_COLUMN_SISO_ANT_A_SGI] = {
 283                 .mode = RS_SISO,
 284                 .ant = ANT_A,
 285                 .sgi = true,
 286                 .next_columns = {
 287                         RS_COLUMN_SISO_ANT_B_SGI,
 288                         RS_COLUMN_MIMO2_SGI,
 289                         RS_COLUMN_SISO_ANT_A,
 290                         RS_COLUMN_LEGACY_ANT_A,
 291                         RS_COLUMN_LEGACY_ANT_B,
 292                         RS_COLUMN_INVALID,
 293                         RS_COLUMN_INVALID,
 294                 },
 295                 .checks = {
 296                         rs_siso_allow,
 297                         rs_ant_allow,
 298                         rs_sgi_allow,
 299                 },
 300         },
 301         [RS_COLUMN_SISO_ANT_B_SGI] = {
 302                 .mode = RS_SISO,
 303                 .ant = ANT_B,
 304                 .sgi = true,
 305                 .next_columns = {
 306                         RS_COLUMN_SISO_ANT_A_SGI,
 307                         RS_COLUMN_MIMO2_SGI,
 308                         RS_COLUMN_SISO_ANT_B,
 309                         RS_COLUMN_LEGACY_ANT_A,
 310                         RS_COLUMN_LEGACY_ANT_B,
 311                         RS_COLUMN_INVALID,
 312                         RS_COLUMN_INVALID,
 313                 },
 314                 .checks = {
 315                         rs_siso_allow,
 316                         rs_ant_allow,
 317                         rs_sgi_allow,
 318                 },
 319         },
 320         [RS_COLUMN_MIMO2] = {
 321                 .mode = RS_MIMO2,
 322                 .ant = ANT_AB,
 323                 .next_columns = {
 324                         RS_COLUMN_SISO_ANT_A,
 325                         RS_COLUMN_MIMO2_SGI,
 326                         RS_COLUMN_LEGACY_ANT_A,
 327                         RS_COLUMN_LEGACY_ANT_B,
 328                         RS_COLUMN_INVALID,
 329                         RS_COLUMN_INVALID,
 330                         RS_COLUMN_INVALID,
 331                 },
 332                 .checks = {
 333                         rs_mimo_allow,
 334                 },
 335         },
 336         [RS_COLUMN_MIMO2_SGI] = {
 337                 .mode = RS_MIMO2,
 338                 .ant = ANT_AB,
 339                 .sgi = true,
 340                 .next_columns = {
 341                         RS_COLUMN_SISO_ANT_A_SGI,
 342                         RS_COLUMN_MIMO2,
 343                         RS_COLUMN_LEGACY_ANT_A,
 344                         RS_COLUMN_LEGACY_ANT_B,
 345                         RS_COLUMN_INVALID,
 346                         RS_COLUMN_INVALID,
 347                         RS_COLUMN_INVALID,
 348                 },
 349                 .checks = {
 350                         rs_mimo_allow,
 351                         rs_sgi_allow,
 352                 },
 353         },
 354 };
 355
 356 static inline u8 rs_extract_rate(u32 rate_n_flags)
 357 {
 358         /* also works for HT because bits 7:6 are zero there */
 359         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 360 }
 361
 362 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 363 {
 364         int idx = 0;
 365
 366         if (rate_n_flags & RATE_MCS_HT_MSK) {
 367                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 368                 idx += IWL_RATE_MCS_0_INDEX;
 369
 370                 /* skip 9M not supported in HT*/
 371                 if (idx >= IWL_RATE_9M_INDEX)
 372                         idx += 1;
 373                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 374                         return idx;
 375         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 376                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 377                 idx += IWL_RATE_MCS_0_INDEX;
 378
 379                 /* skip 9M not supported in VHT*/
 380                 if (idx >= IWL_RATE_9M_INDEX)
 381                         idx++;
 382                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 383                         return idx;
 384         } else {
 385                 /* legacy rate format, search for match in table */
 386
 387                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 388                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 389                         if (iwl_rates[idx].plcp == legacy_rate)
 390                                 return idx;
 391         }
 392
 393         return IWL_RATE_INVALID;
 394 }
 395
 396 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 397                                   struct ieee80211_sta *sta,
 398                                   struct iwl_lq_sta *lq_sta,
 399                                   int tid, bool ndp);
 400 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 401                            struct ieee80211_sta *sta,
 402                            struct iwl_lq_sta *lq_sta,
 403                            const struct rs_rate *initial_rate);
 404 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 405
 406 /**
 407  * The following tables contain the expected throughput metrics for all rates
 408  *
 409  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 410  *
 411  * where invalid entries are zeros.
 412  *
 413  * CCK rates are only valid in legacy table and will only be used in G
 414  * (2.4 GHz) band.
 415  */
 416
 417 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 418         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 419 };
 420
 421 /* Expected TpT tables. 4 indexes:
 422  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 423  */
 424 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 425         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 426         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 427         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 428         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 429 };
 430
 431 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 432         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 433         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 434         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 435         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 436 };
 437
 438 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 439         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 440         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 441         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 442         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 443 };
 444
 445 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
 446         {0, 0, 0, 0, 191, 0, 244, 288,  298,  308,  313,  318,  323,  328,  330},
 447         {0, 0, 0, 0, 200, 0, 251, 293,  302,  312,  317,  322,  327,  332,  334},
 448         {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
 449         {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
 450 };
 451
 452 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 453         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 454         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 455         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 456         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 457 };
 458
 459 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 460         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 461         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 462         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 463         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 464 };
 465
 466 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 467         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 468         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 469         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 470         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 471 };
 472
 473 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
 474         {0, 0, 0, 0, 240, 0, 278,  308,  313,  319,  322,  324,  328,  330,   334},
 475         {0, 0, 0, 0, 247, 0, 282,  310,  315,  320,  323,  325,  329,  332,   338},
 476         {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629,  10592},
 477         {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
 478 };
 479
 480 /* mbps, mcs */
 481 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 482         {  "1", "BPSK DSSS"},
 483         {  "2", "QPSK DSSS"},
 484         {"5.5", "BPSK CCK"},
 485         { "11", "QPSK CCK"},
 486         {  "6", "BPSK 1/2"},
 487         {  "9", "BPSK 1/2"},
 488         { "12", "QPSK 1/2"},
 489         { "18", "QPSK 3/4"},
 490         { "24", "16QAM 1/2"},
 491         { "36", "16QAM 3/4"},
 492         { "48", "64QAM 2/3"},
 493         { "54", "64QAM 3/4"},
 494         { "60", "64QAM 5/6"},
 495 };
 496
 497 #define MCS_INDEX_PER_STREAM    (8)
 498
 499 static const char *rs_pretty_ant(u8 ant)
 500 {
 501         static const char * const ant_name[] = {
 502                 [ANT_NONE] = "None",
 503                 [ANT_A]    = "A",
 504                 [ANT_B]    = "B",
 505                 [ANT_AB]   = "AB",
 506                 [ANT_C]    = "C",
 507                 [ANT_AC]   = "AC",
 508                 [ANT_BC]   = "BC",
 509                 [ANT_ABC]  = "ABC",
 510         };
 511
 512         if (ant > ANT_ABC)
 513                 return "UNKNOWN";
 514
 515         return ant_name[ant];
 516 }
 517
 518 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 519 {
 520         static const char * const lq_types[] = {
 521                 [LQ_NONE] = "NONE",
 522                 [LQ_LEGACY_A] = "LEGACY_A",
 523                 [LQ_LEGACY_G] = "LEGACY_G",
 524                 [LQ_HT_SISO] = "HT SISO",
 525                 [LQ_HT_MIMO2] = "HT MIMO",
 526                 [LQ_VHT_SISO] = "VHT SISO",
 527                 [LQ_VHT_MIMO2] = "VHT MIMO",
 528         };
 529
 530         if (type < LQ_NONE || type >= LQ_MAX)
 531                 return "UNKNOWN";
 532
 533         return lq_types[type];
 534 }
 535
 536 static char *rs_pretty_rate(const struct rs_rate *rate)
 537 {
 538         static char buf[40];
 539         static const char * const legacy_rates[] = {
 540                 [IWL_RATE_1M_INDEX] = "1M",
 541                 [IWL_RATE_2M_INDEX] = "2M",
 542                 [IWL_RATE_5M_INDEX] = "5.5M",
 543                 [IWL_RATE_11M_INDEX] = "11M",
 544                 [IWL_RATE_6M_INDEX] = "6M",
 545                 [IWL_RATE_9M_INDEX] = "9M",
 546                 [IWL_RATE_12M_INDEX] = "12M",
 547                 [IWL_RATE_18M_INDEX] = "18M",
 548                 [IWL_RATE_24M_INDEX] = "24M",
 549                 [IWL_RATE_36M_INDEX] = "36M",
 550                 [IWL_RATE_48M_INDEX] = "48M",
 551                 [IWL_RATE_54M_INDEX] = "54M",
 552         };
 553         static const char *const ht_vht_rates[] = {
 554                 [IWL_RATE_MCS_0_INDEX] = "MCS0",
 555                 [IWL_RATE_MCS_1_INDEX] = "MCS1",
 556                 [IWL_RATE_MCS_2_INDEX] = "MCS2",
 557                 [IWL_RATE_MCS_3_INDEX] = "MCS3",
 558                 [IWL_RATE_MCS_4_INDEX] = "MCS4",
 559                 [IWL_RATE_MCS_5_INDEX] = "MCS5",
 560                 [IWL_RATE_MCS_6_INDEX] = "MCS6",
 561                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
 562                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
 563                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
 564         };
 565         const char *rate_str;
 566
 567         if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
 568                 rate_str = legacy_rates[rate->index];
 569         else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
 570                  (rate->index >= IWL_RATE_MCS_0_INDEX) &&
 571                  (rate->index <= IWL_RATE_MCS_9_INDEX))
 572                 rate_str = ht_vht_rates[rate->index];
 573         else
 574                 rate_str = "BAD_RATE";
 575
 576         sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
 577                 rs_pretty_ant(rate->ant), rate_str);
 578         return buf;
 579 }
 580
 581 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 582                                 const char *prefix)
 583 {
 584         IWL_DEBUG_RATE(mvm,
 585                        "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
 586                        prefix, rs_pretty_rate(rate), rate->bw,
 587                        rate->sgi, rate->ldpc, rate->stbc);
 588 }
 589
 590 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 591 {
 592         window->data = 0;
 593         window->success_counter = 0;
 594         window->success_ratio = IWL_INVALID_VALUE;
 595         window->counter = 0;
 596         window->average_tpt = IWL_INVALID_VALUE;
 597 }
 598
 599 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 600                                             struct iwl_scale_tbl_info *tbl)
 601 {
 602         int i;
 603
 604         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 605         for (i = 0; i < IWL_RATE_COUNT; i++)
 606                 rs_rate_scale_clear_window(&tbl->win[i]);
 607
 608         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 609                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 610 }
 611
 612 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 613 {
 614         return (ant_type & valid_antenna) == ant_type;
 615 }
 616
 617 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 618                                      struct iwl_lq_sta *lq_data, u8 tid,
 619                                      struct ieee80211_sta *sta)
 620 {
 621         int ret = -EAGAIN;
 622
 623         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 624                      sta->addr, tid);
 625         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 626         if (ret == -EAGAIN) {
 627                 /*
 628                  * driver and mac80211 is out of sync
 629                  * this might be cause by reloading firmware
 630                  * stop the tx ba session here
 631                  */
 632                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 633                         tid);
 634                 ieee80211_stop_tx_ba_session(sta, tid);
 635         }
 636         return ret;
 637 }
 638
 639 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 640                               struct iwl_lq_sta *lq_data,
 641                               struct ieee80211_sta *sta)
 642 {
 643         if (tid < IWL_MAX_TID_COUNT)
 644                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 645         else
 646                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 647                         tid, IWL_MAX_TID_COUNT);
 648 }
 649
 650 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 651 {
 652         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 653                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 654                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 655 }
 656
 657 /*
 658  * Static function to get the expected throughput from an iwl_scale_tbl_info
 659  * that wraps a NULL pointer check
 660  */
 661 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 662 {
 663         if (tbl->expected_tpt)
 664                 return tbl->expected_tpt[rs_index];
 665         return 0;
 666 }
 667
 668 /**
 669  * rs_collect_tx_data - Update the success/failure sliding window
 670  *
 671  * We keep a sliding window of the last 62 packets transmitted
 672  * at this rate.  window->data contains the bitmask of successful
 673  * packets.
 674  */
 675 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
 676                                struct iwl_scale_tbl_info *tbl,
 677                                int scale_index, int attempts, int successes,
 678                                struct iwl_rate_scale_data *window)
 679 {
 680         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 681         s32 fail_count, tpt;
 682
 683         /* Get expected throughput */
 684         tpt = get_expected_tpt(tbl, scale_index);
 685
 686         /*
 687          * Keep track of only the latest 62 tx frame attempts in this rate's
 688          * history window; anything older isn't really relevant any more.
 689          * If we have filled up the sliding window, drop the oldest attempt;
 690          * if the oldest attempt (highest bit in bitmap) shows "success",
 691          * subtract "1" from the success counter (this is the main reason
 692          * we keep these bitmaps!).
 693          */
 694         while (attempts > 0) {
 695                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 696                         /* remove earliest */
 697                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 698
 699                         if (window->data & mask) {
 700                                 window->data &= ~mask;
 701                                 window->success_counter--;
 702                         }
 703                 }
 704
 705                 /* Increment frames-attempted counter */
 706                 window->counter++;
 707
 708                 /* Shift bitmap by one frame to throw away oldest history */
 709                 window->data <<= 1;
 710
 711                 /* Mark the most recent #successes attempts as successful */
 712                 if (successes > 0) {
 713                         window->success_counter++;
 714                         window->data |= 0x1;
 715                         successes--;
 716                 }
 717
 718                 attempts--;
 719         }
 720
 721         /* Calculate current success ratio, avoid divide-by-0! */
 722         if (window->counter > 0)
 723                 window->success_ratio = 128 * (100 * window->success_counter)
 724                                         / window->counter;
 725         else
 726                 window->success_ratio = IWL_INVALID_VALUE;
 727
 728         fail_count = window->counter - window->success_counter;
 729
 730         /* Calculate average throughput, if we have enough history. */
 731         if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
 732             (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
 733                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 734         else
 735                 window->average_tpt = IWL_INVALID_VALUE;
 736
 737         return 0;
 738 }
 739
 740 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
 741                                struct iwl_lq_sta *lq_sta,
 742                                struct iwl_scale_tbl_info *tbl,
 743                                int scale_index, int attempts, int successes,
 744                                u8 reduced_txp)
 745 {
 746         struct iwl_rate_scale_data *window = NULL;
 747
 748         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 749                 return -EINVAL;
 750
 751         window = &tbl->tpc_win[reduced_txp];
 752         return  _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 753                                     window);
 754 }
 755
 756 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
 757                                struct iwl_lq_sta *lq_sta,
 758                                struct iwl_scale_tbl_info *tbl,
 759                                int scale_index, int attempts, int successes)
 760 {
 761         struct iwl_rate_scale_data *window = NULL;
 762
 763         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 764                 return -EINVAL;
 765
 766         if (tbl->column != RS_COLUMN_INVALID) {
 767                 struct lq_sta_pers *pers = &lq_sta->pers;
 768
 769                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 770                 pers->tx_stats[tbl->column][scale_index].success += successes;
 771         }
 772
 773         /* Select window for current tx bit rate */
 774         window = &(tbl->win[scale_index]);
 775         return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 776                                    window);
 777 }
 778
 779 /* Convert rs_rate object into ucode rate bitmask */
 780 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 781                                   struct rs_rate *rate)
 782 {
 783         u32 ucode_rate = 0;
 784         int index = rate->index;
 785
 786         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 787                          RATE_MCS_ANT_ABC_MSK);
 788
 789         if (is_legacy(rate)) {
 790                 ucode_rate |= iwl_rates[index].plcp;
 791                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 792                         ucode_rate |= RATE_MCS_CCK_MSK;
 793                 return ucode_rate;
 794         }
 795
 796         if (is_ht(rate)) {
 797                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 798                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 799                         index = IWL_LAST_HT_RATE;
 800                 }
 801                 ucode_rate |= RATE_MCS_HT_MSK;
 802
 803                 if (is_ht_siso(rate))
 804                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 805                 else if (is_ht_mimo2(rate))
 806                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 807                 else
 808                         WARN_ON_ONCE(1);
 809         } else if (is_vht(rate)) {
 810                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 811                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 812                         index = IWL_LAST_VHT_RATE;
 813                 }
 814                 ucode_rate |= RATE_MCS_VHT_MSK;
 815                 if (is_vht_siso(rate))
 816                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 817                 else if (is_vht_mimo2(rate))
 818                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 819                 else
 820                         WARN_ON_ONCE(1);
 821
 822         } else {
 823                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 824         }
 825
 826         if (is_siso(rate) && rate->stbc) {
 827                 /* To enable STBC we need to set both a flag and ANT_AB */
 828                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 829                 ucode_rate |= RATE_MCS_STBC_MSK;
 830         }
 831
 832         ucode_rate |= rate->bw;
 833         if (rate->sgi)
 834                 ucode_rate |= RATE_MCS_SGI_MSK;
 835         if (rate->ldpc)
 836                 ucode_rate |= RATE_MCS_LDPC_MSK;
 837
 838         return ucode_rate;
 839 }
 840
 841 /* Convert a ucode rate into an rs_rate object */
 842 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 843                                    enum nl80211_band band,
 844                                    struct rs_rate *rate)
 845 {
 846         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 847         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 848         u8 nss;
 849
 850         memset(rate, 0, sizeof(*rate));
 851         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 852
 853         if (rate->index == IWL_RATE_INVALID)
 854                 return -EINVAL;
 855
 856         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 857
 858         /* Legacy */
 859         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 860             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 861                 if (num_of_ant == 1) {
 862                         if (band == NL80211_BAND_5GHZ)
 863                                 rate->type = LQ_LEGACY_A;
 864                         else
 865                                 rate->type = LQ_LEGACY_G;
 866                 }
 867
 868                 return 0;
 869         }
 870
 871         /* HT or VHT */
 872         if (ucode_rate & RATE_MCS_SGI_MSK)
 873                 rate->sgi = true;
 874         if (ucode_rate & RATE_MCS_LDPC_MSK)
 875                 rate->ldpc = true;
 876         if (ucode_rate & RATE_MCS_STBC_MSK)
 877                 rate->stbc = true;
 878         if (ucode_rate & RATE_MCS_BF_MSK)
 879                 rate->bfer = true;
 880
 881         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 882
 883         if (ucode_rate & RATE_MCS_HT_MSK) {
 884                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 885                        RATE_HT_MCS_NSS_POS) + 1;
 886
 887                 if (nss == 1) {
 888                         rate->type = LQ_HT_SISO;
 889                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 890                                   "stbc %d bfer %d",
 891                                   rate->stbc, rate->bfer);
 892                 } else if (nss == 2) {
 893                         rate->type = LQ_HT_MIMO2;
 894                         WARN_ON_ONCE(num_of_ant != 2);
 895                 } else {
 896                         WARN_ON_ONCE(1);
 897                 }
 898         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 899                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 900                        RATE_VHT_MCS_NSS_POS) + 1;
 901
 902                 if (nss == 1) {
 903                         rate->type = LQ_VHT_SISO;
 904                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 905                                   "stbc %d bfer %d",
 906                                   rate->stbc, rate->bfer);
 907                 } else if (nss == 2) {
 908                         rate->type = LQ_VHT_MIMO2;
 909                         WARN_ON_ONCE(num_of_ant != 2);
 910                 } else {
 911                         WARN_ON_ONCE(1);
 912                 }
 913         }
 914
 915         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 916                      !is_vht(rate));
 917
 918         return 0;
 919 }
 920
 921 /* switch to another antenna/antennas and return 1 */
 922 /* if no other valid antenna found, return 0 */
 923 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 924 {
 925         u8 new_ant_type;
 926
 927         if (!rate->ant || rate->ant > ANT_ABC)
 928                 return 0;
 929
 930         if (!rs_is_valid_ant(valid_ant, rate->ant))
 931                 return 0;
 932
 933         new_ant_type = ant_toggle_lookup[rate->ant];
 934
 935         while ((new_ant_type != rate->ant) &&
 936                !rs_is_valid_ant(valid_ant, new_ant_type))
 937                 new_ant_type = ant_toggle_lookup[new_ant_type];
 938
 939         if (new_ant_type == rate->ant)
 940                 return 0;
 941
 942         rate->ant = new_ant_type;
 943
 944         return 1;
 945 }
 946
 947 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 948                                   struct rs_rate *rate)
 949 {
 950         if (is_legacy(rate))
 951                 return lq_sta->active_legacy_rate;
 952         else if (is_siso(rate))
 953                 return lq_sta->active_siso_rate;
 954         else if (is_mimo2(rate))
 955                 return lq_sta->active_mimo2_rate;
 956
 957         WARN_ON_ONCE(1);
 958         return 0;
 959 }
 960
 961 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 962                                 int rate_type)
 963 {
 964         u8 high = IWL_RATE_INVALID;
 965         u8 low = IWL_RATE_INVALID;
 966
 967         /* 802.11A or ht walks to the next literal adjacent rate in
 968          * the rate table */
 969         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 970                 int i;
 971                 u32 mask;
 972
 973                 /* Find the previous rate that is in the rate mask */
 974                 i = index - 1;
 975                 if (i >= 0)
 976                         mask = BIT(i);
 977                 for (; i >= 0; i--, mask >>= 1) {
 978                         if (rate_mask & mask) {
 979                                 low = i;
 980                                 break;
 981                         }
 982                 }
 983
 984                 /* Find the next rate that is in the rate mask */
 985                 i = index + 1;
 986                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 987                         if (rate_mask & mask) {
 988                                 high = i;
 989                                 break;
 990                         }
 991                 }
 992
 993                 return (high << 8) | low;
 994         }
 995
 996         low = index;
 997         while (low != IWL_RATE_INVALID) {
 998                 low = iwl_rates[low].prev_rs;
 999                 if (low == IWL_RATE_INVALID)
1000                         break;
1001                 if (rate_mask & (1 << low))
1002                         break;
1003         }
1004
1005         high = index;
1006         while (high != IWL_RATE_INVALID) {
1007                 high = iwl_rates[high].next_rs;
1008                 if (high == IWL_RATE_INVALID)
1009                         break;
1010                 if (rate_mask & (1 << high))
1011                         break;
1012         }
1013
1014         return (high << 8) | low;
1015 }
1016
1017 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1018                                      struct rs_rate *rate)
1019 {
1020         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1021 }
1022
1023 /* Get the next supported lower rate in the current column.
1024  * Return true if bottom rate in the current column was reached
1025  */
1026 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1027                                         struct rs_rate *rate)
1028 {
1029         u8 low;
1030         u16 high_low;
1031         u16 rate_mask;
1032         struct iwl_mvm *mvm = lq_sta->pers.drv;
1033
1034         rate_mask = rs_get_supported_rates(lq_sta, rate);
1035         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1036                                         rate->type);
1037         low = high_low & 0xff;
1038
1039         /* Bottom rate of column reached */
1040         if (low == IWL_RATE_INVALID)
1041                 return true;
1042
1043         rate->index = low;
1044         return false;
1045 }
1046
1047 /* Get the next rate to use following a column downgrade */
1048 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1049                                           struct rs_rate *rate)
1050 {
1051         struct iwl_mvm *mvm = lq_sta->pers.drv;
1052
1053         if (is_legacy(rate)) {
1054                 /* No column to downgrade from Legacy */
1055                 return;
1056         } else if (is_siso(rate)) {
1057                 /* Downgrade to Legacy if we were in SISO */
1058                 if (lq_sta->band == NL80211_BAND_5GHZ)
1059                         rate->type = LQ_LEGACY_A;
1060                 else
1061                         rate->type = LQ_LEGACY_G;
1062
1063                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1064
1065                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1066                              rate->index > IWL_RATE_MCS_9_INDEX);
1067
1068                 rate->index = rs_ht_to_legacy[rate->index];
1069                 rate->ldpc = false;
1070         } else {
1071                 /* Downgrade to SISO with same MCS if in MIMO  */
1072                 rate->type = is_vht_mimo2(rate) ?
1073                         LQ_VHT_SISO : LQ_HT_SISO;
1074         }
1075
1076         if (num_of_ant(rate->ant) > 1)
1077                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1078
1079         /* Relevant in both switching to SISO or Legacy */
1080         rate->sgi = false;
1081
1082         if (!rs_rate_supported(lq_sta, rate))
1083                 rs_get_lower_rate_in_column(lq_sta, rate);
1084 }
1085
1086 /* Check if both rates share the same column */
1087 static inline bool rs_rate_column_match(struct rs_rate *a,
1088                                         struct rs_rate *b)
1089 {
1090         bool ant_match;
1091
1092         if (a->stbc || a->bfer)
1093                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1094         else
1095                 ant_match = (a->ant == b->ant);
1096
1097         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1098                 && ant_match;
1099 }
1100
1101 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1102 {
1103         if (is_legacy(rate)) {
1104                 if (rate->ant == ANT_A)
1105                         return RS_COLUMN_LEGACY_ANT_A;
1106
1107                 if (rate->ant == ANT_B)
1108                         return RS_COLUMN_LEGACY_ANT_B;
1109
1110                 goto err;
1111         }
1112
1113         if (is_siso(rate)) {
1114                 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1115                         return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1116                                 RS_COLUMN_SISO_ANT_A;
1117
1118                 if (rate->ant == ANT_B)
1119                         return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1120                                 RS_COLUMN_SISO_ANT_B;
1121
1122                 goto err;
1123         }
1124
1125         if (is_mimo(rate))
1126                 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1127
1128 err:
1129         return RS_COLUMN_INVALID;
1130 }
1131
1132 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1133 {
1134         u8 tid = IWL_MAX_TID_COUNT;
1135
1136         if (ieee80211_is_data_qos(hdr->frame_control)) {
1137                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1138                 tid = qc[0] & 0xf;
1139         }
1140
1141         if (unlikely(tid > IWL_MAX_TID_COUNT))
1142                 tid = IWL_MAX_TID_COUNT;
1143
1144         return tid;
1145 }
1146
1147 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1148                           int tid, struct ieee80211_tx_info *info, bool ndp)
1149 {
1150         int legacy_success;
1151         int retries;
1152         int i;
1153         struct iwl_lq_cmd *table;
1154         u32 lq_hwrate;
1155         struct rs_rate lq_rate, tx_resp_rate;
1156         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1157         u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
1158         u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
1159         u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
1160         u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1161         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1162         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1163
1164         /* Treat uninitialized rate scaling data same as non-existing. */
1165         if (!lq_sta) {
1166                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1167                 return;
1168         } else if (!lq_sta->pers.drv) {
1169                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1170                 return;
1171         }
1172
1173         /* This packet was aggregated but doesn't carry status info */
1174         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1175             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1176                 return;
1177
1178         rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1179
1180 #ifdef CONFIG_MAC80211_DEBUGFS
1181         /* Disable last tx check if we are debugging with fixed rate but
1182          * update tx stats */
1183         if (lq_sta->pers.dbg_fixed_rate) {
1184                 int index = tx_resp_rate.index;
1185                 enum rs_column column;
1186                 int attempts, success;
1187
1188                 column = rs_get_column_from_rate(&tx_resp_rate);
1189                 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1190                               "Can't map rate 0x%x to column",
1191                               tx_resp_hwrate))
1192                         return;
1193
1194                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1195                         attempts = info->status.ampdu_len;
1196                         success = info->status.ampdu_ack_len;
1197                 } else {
1198                         attempts = info->status.rates[0].count;
1199                         success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1200                 }
1201
1202                 lq_sta->pers.tx_stats[column][index].total += attempts;
1203                 lq_sta->pers.tx_stats[column][index].success += success;
1204
1205                 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1206                                tx_resp_hwrate, success, attempts);
1207                 return;
1208         }
1209 #endif
1210
1211         if (time_after(jiffies,
1212                        (unsigned long)(lq_sta->last_tx +
1213                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1214                 int t;
1215
1216                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1217                 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1218                         ieee80211_stop_tx_ba_session(sta, t);
1219
1220                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1221                 return;
1222         }
1223         lq_sta->last_tx = jiffies;
1224
1225         /* Ignore this Tx frame response if its initial rate doesn't match
1226          * that of latest Link Quality command.  There may be stragglers
1227          * from a previous Link Quality command, but we're no longer interested
1228          * in those; they're either from the "active" mode while we're trying
1229          * to check "search" mode, or a prior "search" mode after we've moved
1230          * to a new "search" mode (which might become the new "active" mode).
1231          */
1232         table = &lq_sta->lq;
1233         lq_hwrate = le32_to_cpu(table->rs_table[0]);
1234         rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1235
1236         /* Here we actually compare this rate to the latest LQ command */
1237         if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
1238                 IWL_DEBUG_RATE(mvm,
1239                                "tx resp color 0x%x does not match 0x%x\n",
1240                                lq_color, LQ_FLAG_COLOR_GET(table->flags));
1241
1242                 /*
1243                  * Since rates mis-match, the last LQ command may have failed.
1244                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1245                  * ... driver.
1246                  */
1247                 lq_sta->missed_rate_counter++;
1248                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1249                         lq_sta->missed_rate_counter = 0;
1250                         IWL_DEBUG_RATE(mvm,
1251                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1252                                        lq_sta->rs_state);
1253                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1254                 }
1255                 /* Regardless, ignore this status info for outdated rate */
1256                 return;
1257         } else
1258                 /* Rate did match, so reset the missed_rate_counter */
1259                 lq_sta->missed_rate_counter = 0;
1260
1261         if (!lq_sta->search_better_tbl) {
1262                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1263                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1264         } else {
1265                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1266                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1267         }
1268
1269         if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1270                 IWL_DEBUG_RATE(mvm,
1271                                "Neither active nor search matches tx rate\n");
1272                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1273                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1274                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1275                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1276                 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1277
1278                 /*
1279                  * no matching table found, let's by-pass the data collection
1280                  * and continue to perform rate scale to find the rate table
1281                  */
1282                 rs_stay_in_table(lq_sta, true);
1283                 goto done;
1284         }
1285
1286         /*
1287          * Updating the frame history depends on whether packets were
1288          * aggregated.
1289          *
1290          * For aggregation, all packets were transmitted at the same rate, the
1291          * first index into rate scale table.
1292          */
1293         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1294                 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
1295                                     info->status.ampdu_len,
1296                                     info->status.ampdu_ack_len,
1297                                     reduced_txp);
1298
1299                 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1300                  * it as a single frame loss as we don't want the success ratio
1301                  * to dip too quickly because a BA wasn't received.
1302                  * For TPC, there's no need for this optimisation since we want
1303                  * to recover very quickly from a bad power reduction and,
1304                  * therefore we'd like the success ratio to get an immediate hit
1305                  * when failing to get a BA, so we'd switch back to a lower or
1306                  * zero power reduction. When FW transmits agg with a rate
1307                  * different from the initial rate, it will not use reduced txp
1308                  * and will send BA notification twice (one empty with reduced
1309                  * txp equal to the value from LQ and one with reduced txp 0).
1310                  * We need to update counters for each txp level accordingly.
1311                  */
1312                 if (info->status.ampdu_ack_len == 0)
1313                         info->status.ampdu_len = 1;
1314
1315                 rs_collect_tlc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
1316                                     info->status.ampdu_len,
1317                                     info->status.ampdu_ack_len);
1318
1319                 /* Update success/fail counts if not searching for new mode */
1320                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1321                         lq_sta->total_success += info->status.ampdu_ack_len;
1322                         lq_sta->total_failed += (info->status.ampdu_len -
1323                                         info->status.ampdu_ack_len);
1324                 }
1325         } else {
1326                 /* For legacy, update frame history with for each Tx retry. */
1327                 retries = info->status.rates[0].count - 1;
1328                 /* HW doesn't send more than 15 retries */
1329                 retries = min(retries, 15);
1330
1331                 /* The last transmission may have been successful */
1332                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1333                 /* Collect data for each rate used during failed TX attempts */
1334                 for (i = 0; i <= retries; ++i) {
1335                         lq_hwrate = le32_to_cpu(table->rs_table[i]);
1336                         rs_rate_from_ucode_rate(lq_hwrate, info->band,
1337                                                 &lq_rate);
1338                         /*
1339                          * Only collect stats if retried rate is in the same RS
1340                          * table as active/search.
1341                          */
1342                         if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1343                                 tmp_tbl = curr_tbl;
1344                         else if (rs_rate_column_match(&lq_rate,
1345                                                       &other_tbl->rate))
1346                                 tmp_tbl = other_tbl;
1347                         else
1348                                 continue;
1349
1350                         rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1351                                             tx_resp_rate.index, 1,
1352                                             i < retries ? 0 : legacy_success,
1353                                             reduced_txp);
1354                         rs_collect_tlc_data(mvm, lq_sta, tmp_tbl,
1355                                             tx_resp_rate.index, 1,
1356                                             i < retries ? 0 : legacy_success);
1357                 }
1358
1359                 /* Update success/fail counts if not searching for new mode */
1360                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1361                         lq_sta->total_success += legacy_success;
1362                         lq_sta->total_failed += retries + (1 - legacy_success);
1363                 }
1364         }
1365         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1366         lq_sta->last_rate_n_flags = lq_hwrate;
1367         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1368 done:
1369         /* See if there's a better rate or modulation mode to try. */
1370         if (sta->supp_rates[info->band])
1371                 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
1372 }
1373
1374 /*
1375  * mac80211 sends us Tx status
1376  */
1377 static void rs_mac80211_tx_status(void *mvm_r,
1378                                   struct ieee80211_supported_band *sband,
1379                                   struct ieee80211_sta *sta, void *priv_sta,
1380                                   struct sk_buff *skb)
1381 {
1382         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1383         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1384         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1385         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1386
1387         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1388                 return;
1389
1390         if (!ieee80211_is_data(hdr->frame_control) ||
1391             info->flags & IEEE80211_TX_CTL_NO_ACK)
1392                 return;
1393
1394         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1395                              ieee80211_is_qos_nullfunc(hdr->frame_control));
1396 }
1397
1398 /*
1399  * Begin a period of staying with a selected modulation mode.
1400  * Set "stay_in_tbl" flag to prevent any mode switches.
1401  * Set frame tx success limits according to legacy vs. high-throughput,
1402  * and reset overall (spanning all rates) tx success history statistics.
1403  * These control how long we stay using same modulation mode before
1404  * searching for a new mode.
1405  */
1406 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1407                                  struct iwl_lq_sta *lq_sta)
1408 {
1409         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1410         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1411         if (is_legacy) {
1412                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1413                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1414                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1415         } else {
1416                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1417                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1418                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1419         }
1420         lq_sta->table_count = 0;
1421         lq_sta->total_failed = 0;
1422         lq_sta->total_success = 0;
1423         lq_sta->flush_timer = jiffies;
1424         lq_sta->visited_columns = 0;
1425 }
1426
1427 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1428 {
1429         if (rate_mask)
1430                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1431         return IWL_RATE_INVALID;
1432 }
1433
1434 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1435                                    const struct rs_tx_column *column)
1436 {
1437         switch (column->mode) {
1438         case RS_LEGACY:
1439                 return lq_sta->max_legacy_rate_idx;
1440         case RS_SISO:
1441                 return lq_sta->max_siso_rate_idx;
1442         case RS_MIMO2:
1443                 return lq_sta->max_mimo2_rate_idx;
1444         default:
1445                 WARN_ON_ONCE(1);
1446         }
1447
1448         return lq_sta->max_legacy_rate_idx;
1449 }
1450
1451 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1452                                             const struct rs_tx_column *column,
1453                                             u32 bw)
1454 {
1455         /* Used to choose among HT tables */
1456         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1457
1458         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1459                          column->mode != RS_SISO &&
1460                          column->mode != RS_MIMO2))
1461                 return expected_tpt_legacy;
1462
1463         /* Legacy rates have only one table */
1464         if (column->mode == RS_LEGACY)
1465                 return expected_tpt_legacy;
1466
1467         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1468         /* Choose among many HT tables depending on number of streams
1469          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1470          * status */
1471         if (column->mode == RS_SISO) {
1472                 switch (bw) {
1473                 case RATE_MCS_CHAN_WIDTH_20:
1474                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1475                         break;
1476                 case RATE_MCS_CHAN_WIDTH_40:
1477                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1478                         break;
1479                 case RATE_MCS_CHAN_WIDTH_80:
1480                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1481                         break;
1482                 case RATE_MCS_CHAN_WIDTH_160:
1483                         ht_tbl_pointer = expected_tpt_siso_160MHz;
1484                         break;
1485                 default:
1486                         WARN_ON_ONCE(1);
1487                 }
1488         } else if (column->mode == RS_MIMO2) {
1489                 switch (bw) {
1490                 case RATE_MCS_CHAN_WIDTH_20:
1491                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1492                         break;
1493                 case RATE_MCS_CHAN_WIDTH_40:
1494                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1495                         break;
1496                 case RATE_MCS_CHAN_WIDTH_80:
1497                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1498                         break;
1499                 case RATE_MCS_CHAN_WIDTH_160:
1500                         ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1501                         break;
1502                 default:
1503                         WARN_ON_ONCE(1);
1504                 }
1505         } else {
1506                 WARN_ON_ONCE(1);
1507         }
1508
1509         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1510                 return ht_tbl_pointer[0];
1511         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1512                 return ht_tbl_pointer[1];
1513         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1514                 return ht_tbl_pointer[2];
1515         else                                            /* AGG+SGI */
1516                 return ht_tbl_pointer[3];
1517 }
1518
1519 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1520                                       struct iwl_scale_tbl_info *tbl)
1521 {
1522         struct rs_rate *rate = &tbl->rate;
1523         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1524
1525         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1526 }
1527
1528 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1529                             struct iwl_lq_sta *lq_sta,
1530                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1531                             unsigned long rate_mask, s8 index)
1532 {
1533         struct iwl_scale_tbl_info *active_tbl =
1534             &(lq_sta->lq_info[lq_sta->active_tbl]);
1535         s32 success_ratio = active_tbl->win[index].success_ratio;
1536         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1537         const u16 *tpt_tbl = tbl->expected_tpt;
1538         u16 high_low;
1539         u32 target_tpt;
1540         int rate_idx;
1541
1542         if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1543                 target_tpt = 100 * expected_current_tpt;
1544                 IWL_DEBUG_RATE(mvm,
1545                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1546                                success_ratio, target_tpt);
1547         } else {
1548                 target_tpt = lq_sta->last_tpt;
1549                 IWL_DEBUG_RATE(mvm,
1550                                "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1551                                success_ratio, target_tpt);
1552         }
1553
1554         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1555
1556         while (rate_idx != IWL_RATE_INVALID) {
1557                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1558                         break;
1559
1560                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1561                                                 tbl->rate.type);
1562
1563                 rate_idx = (high_low >> 8) & 0xff;
1564         }
1565
1566         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1567                        rate_idx, target_tpt,
1568                        rate_idx != IWL_RATE_INVALID ?
1569                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1570
1571         return rate_idx;
1572 }
1573
1574 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1575 {
1576         switch (sta->bandwidth) {
1577         case IEEE80211_STA_RX_BW_160:
1578                 return RATE_MCS_CHAN_WIDTH_160;
1579         case IEEE80211_STA_RX_BW_80:
1580                 return RATE_MCS_CHAN_WIDTH_80;
1581         case IEEE80211_STA_RX_BW_40:
1582                 return RATE_MCS_CHAN_WIDTH_40;
1583         case IEEE80211_STA_RX_BW_20:
1584         default:
1585                 return RATE_MCS_CHAN_WIDTH_20;
1586         }
1587 }
1588
1589 /*
1590  * Check whether we should continue using same modulation mode, or
1591  * begin search for a new mode, based on:
1592  * 1) # tx successes or failures while using this mode
1593  * 2) # times calling this function
1594  * 3) elapsed time in this mode (not used, for now)
1595  */
1596 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1597 {
1598         struct iwl_scale_tbl_info *tbl;
1599         int active_tbl;
1600         int flush_interval_passed = 0;
1601         struct iwl_mvm *mvm;
1602
1603         mvm = lq_sta->pers.drv;
1604         active_tbl = lq_sta->active_tbl;
1605
1606         tbl = &(lq_sta->lq_info[active_tbl]);
1607
1608         /* If we've been disallowing search, see if we should now allow it */
1609         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1610                 /* Elapsed time using current modulation mode */
1611                 if (lq_sta->flush_timer)
1612                         flush_interval_passed =
1613                                 time_after(jiffies,
1614                                            (unsigned long)(lq_sta->flush_timer +
1615                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1616
1617                 /*
1618                  * Check if we should allow search for new modulation mode.
1619                  * If many frames have failed or succeeded, or we've used
1620                  * this same modulation for a long time, allow search, and
1621                  * reset history stats that keep track of whether we should
1622                  * allow a new search.  Also (below) reset all bitmaps and
1623                  * stats in active history.
1624                  */
1625                 if (force_search ||
1626                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1627                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1628                     ((!lq_sta->search_better_tbl) &&
1629                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1630                         IWL_DEBUG_RATE(mvm,
1631                                        "LQ: stay is expired %d %d %d\n",
1632                                      lq_sta->total_failed,
1633                                      lq_sta->total_success,
1634                                      flush_interval_passed);
1635
1636                         /* Allow search for new mode */
1637                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1638                         IWL_DEBUG_RATE(mvm,
1639                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1640                         lq_sta->total_failed = 0;
1641                         lq_sta->total_success = 0;
1642                         lq_sta->flush_timer = 0;
1643                         /* mark the current column as visited */
1644                         lq_sta->visited_columns = BIT(tbl->column);
1645                 /*
1646                  * Else if we've used this modulation mode enough repetitions
1647                  * (regardless of elapsed time or success/failure), reset
1648                  * history bitmaps and rate-specific stats for all rates in
1649                  * active table.
1650                  */
1651                 } else {
1652                         lq_sta->table_count++;
1653                         if (lq_sta->table_count >=
1654                             lq_sta->table_count_limit) {
1655                                 lq_sta->table_count = 0;
1656
1657                                 IWL_DEBUG_RATE(mvm,
1658                                                "LQ: stay in table clear win\n");
1659                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1660                         }
1661                 }
1662
1663                 /* If transitioning to allow "search", reset all history
1664                  * bitmaps and stats in active table (this will become the new
1665                  * "search" table). */
1666                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1667                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1668                 }
1669         }
1670 }
1671
1672 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1673                              struct iwl_scale_tbl_info *tbl,
1674                              enum rs_action scale_action)
1675 {
1676         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
1677
1678         if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1679             tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1680             scale_action == RS_ACTION_DOWNSCALE)
1681                 sta_priv->tlc_amsdu = false;
1682         else
1683                 sta_priv->tlc_amsdu = true;
1684 }
1685
1686 /*
1687  * setup rate table in uCode
1688  */
1689 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1690                                struct ieee80211_sta *sta,
1691                                struct iwl_lq_sta *lq_sta,
1692                                struct iwl_scale_tbl_info *tbl)
1693 {
1694         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1695         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1696 }
1697
1698 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1699                               struct ieee80211_sta *sta,
1700                               struct iwl_lq_sta *lq_sta,
1701                               struct iwl_scale_tbl_info *tbl,
1702                               enum rs_action scale_action)
1703 {
1704         if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1705                 return false;
1706
1707         if (!is_vht_siso(&tbl->rate))
1708                 return false;
1709
1710         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1711             (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1712             (scale_action == RS_ACTION_DOWNSCALE)) {
1713                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1714                 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1715                 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1716                 goto tweaked;
1717         }
1718
1719         /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1720          * sustainable, i.e. we're past the test window. We can't go back
1721          * if MCS5 is just tested as this will happen always after switching
1722          * to 20Mhz MCS4 because the rate stats are cleared.
1723          */
1724         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1725             (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1726              (scale_action == RS_ACTION_STAY)) ||
1727              ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1728               (scale_action == RS_ACTION_UPSCALE)))) {
1729                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1730                 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1731                 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1732                 goto tweaked;
1733         }
1734
1735         return false;
1736
1737 tweaked:
1738         rs_set_expected_tpt_table(lq_sta, tbl);
1739         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1740         return true;
1741 }
1742
1743 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1744                                          struct iwl_lq_sta *lq_sta,
1745                                          struct ieee80211_sta *sta,
1746                                          struct iwl_scale_tbl_info *tbl)
1747 {
1748         int i, j, max_rate;
1749         enum rs_column next_col_id;
1750         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1751         const struct rs_tx_column *next_col;
1752         allow_column_func_t allow_func;
1753         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1754         const u16 *expected_tpt_tbl;
1755         u16 tpt, max_expected_tpt;
1756
1757         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1758                 next_col_id = curr_col->next_columns[i];
1759
1760                 if (next_col_id == RS_COLUMN_INVALID)
1761                         continue;
1762
1763                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1764                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1765                                        next_col_id);
1766                         continue;
1767                 }
1768
1769                 next_col = &rs_tx_columns[next_col_id];
1770
1771                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1772                         IWL_DEBUG_RATE(mvm,
1773                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1774                                        next_col_id, valid_ants, next_col->ant);
1775                         continue;
1776                 }
1777
1778                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1779                         allow_func = next_col->checks[j];
1780                         if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1781                                                       next_col))
1782                                 break;
1783                 }
1784
1785                 if (j != MAX_COLUMN_CHECKS) {
1786                         IWL_DEBUG_RATE(mvm,
1787                                        "Skip column %d: not allowed (check %d failed)\n",
1788                                        next_col_id, j);
1789
1790                         continue;
1791                 }
1792
1793                 tpt = lq_sta->last_tpt / 100;
1794                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1795                                                      rs_bw_from_sta_bw(sta));
1796                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1797                         continue;
1798
1799                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1800                 if (max_rate == IWL_RATE_INVALID) {
1801                         IWL_DEBUG_RATE(mvm,
1802                                        "Skip column %d: no rate is allowed in this column\n",
1803                                        next_col_id);
1804                         continue;
1805                 }
1806
1807                 max_expected_tpt = expected_tpt_tbl[max_rate];
1808                 if (tpt >= max_expected_tpt) {
1809                         IWL_DEBUG_RATE(mvm,
1810                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1811                                        next_col_id, max_expected_tpt, tpt);
1812                         continue;
1813                 }
1814
1815                 IWL_DEBUG_RATE(mvm,
1816                                "Found potential column %d. Max expected %d current %d\n",
1817                                next_col_id, max_expected_tpt, tpt);
1818                 break;
1819         }
1820
1821         if (i == MAX_NEXT_COLUMNS)
1822                 return RS_COLUMN_INVALID;
1823
1824         return next_col_id;
1825 }
1826
1827 static int rs_switch_to_column(struct iwl_mvm *mvm,
1828                                struct iwl_lq_sta *lq_sta,
1829                                struct ieee80211_sta *sta,
1830                                enum rs_column col_id)
1831 {
1832         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1833         struct iwl_scale_tbl_info *search_tbl =
1834                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1835         struct rs_rate *rate = &search_tbl->rate;
1836         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1837         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1838         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1839                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1840         unsigned long rate_mask = 0;
1841         u32 rate_idx = 0;
1842
1843         memcpy(search_tbl, tbl, sz);
1844
1845         rate->sgi = column->sgi;
1846         rate->ant = column->ant;
1847
1848         if (column->mode == RS_LEGACY) {
1849                 if (lq_sta->band == NL80211_BAND_5GHZ)
1850                         rate->type = LQ_LEGACY_A;
1851                 else
1852                         rate->type = LQ_LEGACY_G;
1853
1854                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1855                 rate->ldpc = false;
1856                 rate_mask = lq_sta->active_legacy_rate;
1857         } else if (column->mode == RS_SISO) {
1858                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1859                 rate_mask = lq_sta->active_siso_rate;
1860         } else if (column->mode == RS_MIMO2) {
1861                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1862                 rate_mask = lq_sta->active_mimo2_rate;
1863         } else {
1864                 WARN_ONCE(1, "Bad column mode");
1865         }
1866
1867         if (column->mode != RS_LEGACY) {
1868                 rate->bw = rs_bw_from_sta_bw(sta);
1869                 rate->ldpc = lq_sta->ldpc;
1870         }
1871
1872         search_tbl->column = col_id;
1873         rs_set_expected_tpt_table(lq_sta, search_tbl);
1874
1875         lq_sta->visited_columns |= BIT(col_id);
1876
1877         /* Get the best matching rate if we're changing modes. e.g.
1878          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1879          */
1880         if (curr_column->mode != column->mode) {
1881                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1882                                             rate_mask, rate->index);
1883
1884                 if ((rate_idx == IWL_RATE_INVALID) ||
1885                     !(BIT(rate_idx) & rate_mask)) {
1886                         IWL_DEBUG_RATE(mvm,
1887                                        "can not switch with index %d"
1888                                        " rate mask %lx\n",
1889                                        rate_idx, rate_mask);
1890
1891                         goto err;
1892                 }
1893
1894                 rate->index = rate_idx;
1895         }
1896
1897         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1898                        col_id, rate->index);
1899
1900         return 0;
1901
1902 err:
1903         rate->type = LQ_NONE;
1904         return -1;
1905 }
1906
1907 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1908                                          struct iwl_scale_tbl_info *tbl,
1909                                          s32 sr, int low, int high,
1910                                          int current_tpt,
1911                                          int low_tpt, int high_tpt)
1912 {
1913         enum rs_action action = RS_ACTION_STAY;
1914
1915         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1916             (current_tpt == 0)) {
1917                 IWL_DEBUG_RATE(mvm,
1918                                "Decrease rate because of low SR\n");
1919                 return RS_ACTION_DOWNSCALE;
1920         }
1921
1922         if ((low_tpt == IWL_INVALID_VALUE) &&
1923             (high_tpt == IWL_INVALID_VALUE) &&
1924             (high != IWL_RATE_INVALID)) {
1925                 IWL_DEBUG_RATE(mvm,
1926                                "No data about high/low rates. Increase rate\n");
1927                 return RS_ACTION_UPSCALE;
1928         }
1929
1930         if ((high_tpt == IWL_INVALID_VALUE) &&
1931             (high != IWL_RATE_INVALID) &&
1932             (low_tpt != IWL_INVALID_VALUE) &&
1933             (low_tpt < current_tpt)) {
1934                 IWL_DEBUG_RATE(mvm,
1935                                "No data about high rate and low rate is worse. Increase rate\n");
1936                 return RS_ACTION_UPSCALE;
1937         }
1938
1939         if ((high_tpt != IWL_INVALID_VALUE) &&
1940             (high_tpt > current_tpt)) {
1941                 IWL_DEBUG_RATE(mvm,
1942                                "Higher rate is better. Increate rate\n");
1943                 return RS_ACTION_UPSCALE;
1944         }
1945
1946         if ((low_tpt != IWL_INVALID_VALUE) &&
1947             (high_tpt != IWL_INVALID_VALUE) &&
1948             (low_tpt < current_tpt) &&
1949             (high_tpt < current_tpt)) {
1950                 IWL_DEBUG_RATE(mvm,
1951                                "Both high and low are worse. Maintain rate\n");
1952                 return RS_ACTION_STAY;
1953         }
1954
1955         if ((low_tpt != IWL_INVALID_VALUE) &&
1956             (low_tpt > current_tpt)) {
1957                 IWL_DEBUG_RATE(mvm,
1958                                "Lower rate is better\n");
1959                 action = RS_ACTION_DOWNSCALE;
1960                 goto out;
1961         }
1962
1963         if ((low_tpt == IWL_INVALID_VALUE) &&
1964             (low != IWL_RATE_INVALID)) {
1965                 IWL_DEBUG_RATE(mvm,
1966                                "No data about lower rate\n");
1967                 action = RS_ACTION_DOWNSCALE;
1968                 goto out;
1969         }
1970
1971         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1972
1973 out:
1974         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1975                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1976                         IWL_DEBUG_RATE(mvm,
1977                                        "SR is above NO DECREASE. Avoid downscale\n");
1978                         action = RS_ACTION_STAY;
1979                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1980                         IWL_DEBUG_RATE(mvm,
1981                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1982                         action = RS_ACTION_STAY;
1983                 } else {
1984                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1985                 }
1986         }
1987
1988         return action;
1989 }
1990
1991 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1992                           struct iwl_lq_sta *lq_sta)
1993 {
1994         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1995          * supports STBC of at least 1*SS
1996          */
1997         if (!lq_sta->stbc_capable)
1998                 return false;
1999
2000         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2001                 return false;
2002
2003         return true;
2004 }
2005
2006 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2007                                 int *weaker, int *stronger)
2008 {
2009         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2010         if (*weaker > TPC_MAX_REDUCTION)
2011                 *weaker = TPC_INVALID;
2012
2013         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2014         if (*stronger < 0)
2015                 *stronger = TPC_INVALID;
2016 }
2017
2018 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2019                            struct rs_rate *rate, enum nl80211_band band)
2020 {
2021         int index = rate->index;
2022         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2023         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2024                                 !vif->bss_conf.ps);
2025
2026         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2027                        cam, sta_ps_disabled);
2028         /*
2029          * allow tpc only if power management is enabled, or bt coex
2030          * activity grade allows it and we are on 2.4Ghz.
2031          */
2032         if ((cam || sta_ps_disabled) &&
2033             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2034                 return false;
2035
2036         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2037         if (is_legacy(rate))
2038                 return index == IWL_RATE_54M_INDEX;
2039         if (is_ht(rate))
2040                 return index == IWL_RATE_MCS_7_INDEX;
2041         if (is_vht(rate))
2042                 return index == IWL_RATE_MCS_7_INDEX ||
2043                        index == IWL_RATE_MCS_8_INDEX ||
2044                        index == IWL_RATE_MCS_9_INDEX;
2045
2046         WARN_ON_ONCE(1);
2047         return false;
2048 }
2049
2050 enum tpc_action {
2051         TPC_ACTION_STAY,
2052         TPC_ACTION_DECREASE,
2053         TPC_ACTION_INCREASE,
2054         TPC_ACTION_NO_RESTIRCTION,
2055 };
2056
2057 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2058                                          s32 sr, int weak, int strong,
2059                                          int current_tpt,
2060                                          int weak_tpt, int strong_tpt)
2061 {
2062         /* stay until we have valid tpt */
2063         if (current_tpt == IWL_INVALID_VALUE) {
2064                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2065                 return TPC_ACTION_STAY;
2066         }
2067
2068         /* Too many failures, increase txp */
2069         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2070             current_tpt == 0) {
2071                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2072                 return TPC_ACTION_NO_RESTIRCTION;
2073         }
2074
2075         /* try decreasing first if applicable */
2076         if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2077             weak != TPC_INVALID) {
2078                 if (weak_tpt == IWL_INVALID_VALUE &&
2079                     (strong_tpt == IWL_INVALID_VALUE ||
2080                      current_tpt >= strong_tpt)) {
2081                         IWL_DEBUG_RATE(mvm,
2082                                        "no weak txp measurement. decrease txp\n");
2083                         return TPC_ACTION_DECREASE;
2084                 }
2085
2086                 if (weak_tpt > current_tpt) {
2087                         IWL_DEBUG_RATE(mvm,
2088                                        "lower txp has better tpt. decrease txp\n");
2089                         return TPC_ACTION_DECREASE;
2090                 }
2091         }
2092
2093         /* next, increase if needed */
2094         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2095             strong != TPC_INVALID) {
2096                 if (weak_tpt == IWL_INVALID_VALUE &&
2097                     strong_tpt != IWL_INVALID_VALUE &&
2098                     current_tpt < strong_tpt) {
2099                         IWL_DEBUG_RATE(mvm,
2100                                        "higher txp has better tpt. increase txp\n");
2101                         return TPC_ACTION_INCREASE;
2102                 }
2103
2104                 if (weak_tpt < current_tpt &&
2105                     (strong_tpt == IWL_INVALID_VALUE ||
2106                      strong_tpt > current_tpt)) {
2107                         IWL_DEBUG_RATE(mvm,
2108                                        "lower txp has worse tpt. increase txp\n");
2109                         return TPC_ACTION_INCREASE;
2110                 }
2111         }
2112
2113         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2114         return TPC_ACTION_STAY;
2115 }
2116
2117 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2118                            struct ieee80211_sta *sta,
2119                            struct iwl_lq_sta *lq_sta,
2120                            struct iwl_scale_tbl_info *tbl)
2121 {
2122         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2123         struct ieee80211_vif *vif = mvm_sta->vif;
2124         struct ieee80211_chanctx_conf *chanctx_conf;
2125         enum nl80211_band band;
2126         struct iwl_rate_scale_data *window;
2127         struct rs_rate *rate = &tbl->rate;
2128         enum tpc_action action;
2129         s32 sr;
2130         u8 cur = lq_sta->lq.reduced_tpc;
2131         int current_tpt;
2132         int weak, strong;
2133         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2134
2135 #ifdef CONFIG_MAC80211_DEBUGFS
2136         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2137                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2138                                lq_sta->pers.dbg_fixed_txp_reduction);
2139                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2140                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2141         }
2142 #endif
2143
2144         rcu_read_lock();
2145         chanctx_conf = rcu_dereference(vif->chanctx_conf);
2146         if (WARN_ON(!chanctx_conf))
2147                 band = NUM_NL80211_BANDS;
2148         else
2149                 band = chanctx_conf->def.chan->band;
2150         rcu_read_unlock();
2151
2152         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2153                 IWL_DEBUG_RATE(mvm,
2154                                "tpc is not allowed. remove txp restrictions\n");
2155                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2156                 return cur != TPC_NO_REDUCTION;
2157         }
2158
2159         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2160
2161         /* Collect measured throughputs for current and adjacent rates */
2162         window = tbl->tpc_win;
2163         sr = window[cur].success_ratio;
2164         current_tpt = window[cur].average_tpt;
2165         if (weak != TPC_INVALID)
2166                 weak_tpt = window[weak].average_tpt;
2167         if (strong != TPC_INVALID)
2168                 strong_tpt = window[strong].average_tpt;
2169
2170         IWL_DEBUG_RATE(mvm,
2171                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2172                        cur, current_tpt, sr, weak, strong,
2173                        weak_tpt, strong_tpt);
2174
2175         action = rs_get_tpc_action(mvm, sr, weak, strong,
2176                                    current_tpt, weak_tpt, strong_tpt);
2177
2178         /* override actions if we are on the edge */
2179         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2180                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2181                 action = TPC_ACTION_STAY;
2182         } else if (strong == TPC_INVALID &&
2183                    (action == TPC_ACTION_INCREASE ||
2184                     action == TPC_ACTION_NO_RESTIRCTION)) {
2185                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2186                 action = TPC_ACTION_STAY;
2187         }
2188
2189         switch (action) {
2190         case TPC_ACTION_DECREASE:
2191                 lq_sta->lq.reduced_tpc = weak;
2192                 return true;
2193         case TPC_ACTION_INCREASE:
2194                 lq_sta->lq.reduced_tpc = strong;
2195                 return true;
2196         case TPC_ACTION_NO_RESTIRCTION:
2197                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2198                 return true;
2199         case TPC_ACTION_STAY:
2200                 /* do nothing */
2201                 break;
2202         }
2203         return false;
2204 }
2205
2206 /*
2207  * Do rate scaling and search for new modulation mode.
2208  */
2209 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2210                                   struct ieee80211_sta *sta,
2211                                   struct iwl_lq_sta *lq_sta,
2212                                   int tid, bool ndp)
2213 {
2214         int low = IWL_RATE_INVALID;
2215         int high = IWL_RATE_INVALID;
2216         int index;
2217         struct iwl_rate_scale_data *window = NULL;
2218         int current_tpt = IWL_INVALID_VALUE;
2219         int low_tpt = IWL_INVALID_VALUE;
2220         int high_tpt = IWL_INVALID_VALUE;
2221         u32 fail_count;
2222         enum rs_action scale_action = RS_ACTION_STAY;
2223         u16 rate_mask;
2224         u8 update_lq = 0;
2225         struct iwl_scale_tbl_info *tbl, *tbl1;
2226         u8 active_tbl = 0;
2227         u8 done_search = 0;
2228         u16 high_low;
2229         s32 sr;
2230         u8 prev_agg = lq_sta->is_agg;
2231         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2232         struct iwl_mvm_tid_data *tid_data;
2233         struct rs_rate *rate;
2234
2235         lq_sta->is_agg = !!sta_priv->agg_tids;
2236
2237         /*
2238          * Select rate-scale / modulation-mode table to work with in
2239          * the rest of this function:  "search" if searching for better
2240          * modulation mode, or "active" if doing rate scaling within a mode.
2241          */
2242         if (!lq_sta->search_better_tbl)
2243                 active_tbl = lq_sta->active_tbl;
2244         else
2245                 active_tbl = 1 - lq_sta->active_tbl;
2246
2247         tbl = &(lq_sta->lq_info[active_tbl]);
2248         rate = &tbl->rate;
2249
2250         if (prev_agg != lq_sta->is_agg) {
2251                 IWL_DEBUG_RATE(mvm,
2252                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2253                                prev_agg, lq_sta->is_agg);
2254                 rs_set_expected_tpt_table(lq_sta, tbl);
2255                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2256         }
2257
2258         /* current tx rate */
2259         index = rate->index;
2260
2261         /* rates available for this association, and for modulation mode */
2262         rate_mask = rs_get_supported_rates(lq_sta, rate);
2263
2264         if (!(BIT(index) & rate_mask)) {
2265                 IWL_ERR(mvm, "Current Rate is not valid\n");
2266                 if (lq_sta->search_better_tbl) {
2267                         /* revert to active table if search table is not valid*/
2268                         rate->type = LQ_NONE;
2269                         lq_sta->search_better_tbl = 0;
2270                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2271                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2272                 }
2273                 return;
2274         }
2275
2276         /* Get expected throughput table and history window for current rate */
2277         if (!tbl->expected_tpt) {
2278                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2279                 return;
2280         }
2281
2282         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2283         window = &(tbl->win[index]);
2284
2285         /*
2286          * If there is not enough history to calculate actual average
2287          * throughput, keep analyzing results of more tx frames, without
2288          * changing rate or mode (bypass most of the rest of this function).
2289          * Set up new rate table in uCode only if old rate is not supported
2290          * in current association (use new rate found above).
2291          */
2292         fail_count = window->counter - window->success_counter;
2293         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2294             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2295                 IWL_DEBUG_RATE(mvm,
2296                                "%s: Test Window: succ %d total %d\n",
2297                                rs_pretty_rate(rate),
2298                                window->success_counter, window->counter);
2299
2300                 /* Can't calculate this yet; not enough history */
2301                 window->average_tpt = IWL_INVALID_VALUE;
2302
2303                 /* Should we stay with this modulation mode,
2304                  * or search for a new one? */
2305                 rs_stay_in_table(lq_sta, false);
2306
2307                 return;
2308         }
2309
2310         /* If we are searching for better modulation mode, check success. */
2311         if (lq_sta->search_better_tbl) {
2312                 /* If good success, continue using the "search" mode;
2313                  * no need to send new link quality command, since we're
2314                  * continuing to use the setup that we've been trying. */
2315                 if (window->average_tpt > lq_sta->last_tpt) {
2316                         IWL_DEBUG_RATE(mvm,
2317                                        "SWITCHING TO NEW TABLE SR: %d "
2318                                        "cur-tpt %d old-tpt %d\n",
2319                                        window->success_ratio,
2320                                        window->average_tpt,
2321                                        lq_sta->last_tpt);
2322
2323                         /* Swap tables; "search" becomes "active" */
2324                         lq_sta->active_tbl = active_tbl;
2325                         current_tpt = window->average_tpt;
2326                 /* Else poor success; go back to mode in "active" table */
2327                 } else {
2328                         IWL_DEBUG_RATE(mvm,
2329                                        "GOING BACK TO THE OLD TABLE: SR %d "
2330                                        "cur-tpt %d old-tpt %d\n",
2331                                        window->success_ratio,
2332                                        window->average_tpt,
2333                                        lq_sta->last_tpt);
2334
2335                         /* Nullify "search" table */
2336                         rate->type = LQ_NONE;
2337
2338                         /* Revert to "active" table */
2339                         active_tbl = lq_sta->active_tbl;
2340                         tbl = &(lq_sta->lq_info[active_tbl]);
2341
2342                         /* Revert to "active" rate and throughput info */
2343                         index = tbl->rate.index;
2344                         current_tpt = lq_sta->last_tpt;
2345
2346                         /* Need to set up a new rate table in uCode */
2347                         update_lq = 1;
2348                 }
2349
2350                 /* Either way, we've made a decision; modulation mode
2351                  * search is done, allow rate adjustment next time. */
2352                 lq_sta->search_better_tbl = 0;
2353                 done_search = 1;        /* Don't switch modes below! */
2354                 goto lq_update;
2355         }
2356
2357         /* (Else) not in search of better modulation mode, try for better
2358          * starting rate, while staying in this mode. */
2359         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2360         low = high_low & 0xff;
2361         high = (high_low >> 8) & 0xff;
2362
2363         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2364
2365         sr = window->success_ratio;
2366
2367         /* Collect measured throughputs for current and adjacent rates */
2368         current_tpt = window->average_tpt;
2369         if (low != IWL_RATE_INVALID)
2370                 low_tpt = tbl->win[low].average_tpt;
2371         if (high != IWL_RATE_INVALID)
2372                 high_tpt = tbl->win[high].average_tpt;
2373
2374         IWL_DEBUG_RATE(mvm,
2375                        "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2376                        rs_pretty_rate(rate), current_tpt, sr,
2377                        low, high, low_tpt, high_tpt);
2378
2379         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2380                                           current_tpt, low_tpt, high_tpt);
2381
2382         /* Force a search in case BT doesn't like us being in MIMO */
2383         if (is_mimo(rate) &&
2384             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2385                 IWL_DEBUG_RATE(mvm,
2386                                "BT Coex forbids MIMO. Search for new config\n");
2387                 rs_stay_in_table(lq_sta, true);
2388                 goto lq_update;
2389         }
2390
2391         switch (scale_action) {
2392         case RS_ACTION_DOWNSCALE:
2393                 /* Decrease starting rate, update uCode's rate table */
2394                 if (low != IWL_RATE_INVALID) {
2395                         update_lq = 1;
2396                         index = low;
2397                 } else {
2398                         IWL_DEBUG_RATE(mvm,
2399                                        "At the bottom rate. Can't decrease\n");
2400                 }
2401
2402                 break;
2403         case RS_ACTION_UPSCALE:
2404                 /* Increase starting rate, update uCode's rate table */
2405                 if (high != IWL_RATE_INVALID) {
2406                         update_lq = 1;
2407                         index = high;
2408                 } else {
2409                         IWL_DEBUG_RATE(mvm,
2410                                        "At the top rate. Can't increase\n");
2411                 }
2412
2413                 break;
2414         case RS_ACTION_STAY:
2415                 /* No change */
2416                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2417                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2418                 break;
2419         default:
2420                 break;
2421         }
2422
2423 lq_update:
2424         /* Replace uCode's rate table for the destination station. */
2425         if (update_lq) {
2426                 tbl->rate.index = index;
2427                 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2428                         rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2429                 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2430                 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2431         }
2432
2433         rs_stay_in_table(lq_sta, false);
2434
2435         /*
2436          * Search for new modulation mode if we're:
2437          * 1)  Not changing rates right now
2438          * 2)  Not just finishing up a search
2439          * 3)  Allowing a new search
2440          */
2441         if (!update_lq && !done_search &&
2442             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2443             && window->counter) {
2444                 enum rs_column next_column;
2445
2446                 /* Save current throughput to compare with "search" throughput*/
2447                 lq_sta->last_tpt = current_tpt;
2448
2449                 IWL_DEBUG_RATE(mvm,
2450                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2451                                update_lq, done_search, lq_sta->rs_state,
2452                                window->counter);
2453
2454                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2455                 if (next_column != RS_COLUMN_INVALID) {
2456                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2457                                                       next_column);
2458                         if (!ret)
2459                                 lq_sta->search_better_tbl = 1;
2460                 } else {
2461                         IWL_DEBUG_RATE(mvm,
2462                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2463                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2464                 }
2465
2466                 /* If new "search" mode was selected, set up in uCode table */
2467                 if (lq_sta->search_better_tbl) {
2468                         /* Access the "search" table, clear its history. */
2469                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2470                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2471
2472                         /* Use new "search" start rate */
2473                         index = tbl->rate.index;
2474
2475                         rs_dump_rate(mvm, &tbl->rate,
2476                                      "Switch to SEARCH TABLE:");
2477                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2478                 } else {
2479                         done_search = 1;
2480                 }
2481         }
2482
2483         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2484                 /* If the "active" (non-search) mode was legacy,
2485                  * and we've tried switching antennas,
2486                  * but we haven't been able to try HT modes (not available),
2487                  * stay with best antenna legacy modulation for a while
2488                  * before next round of mode comparisons. */
2489                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2490                 if (is_legacy(&tbl1->rate)) {
2491                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2492
2493                         if (tid != IWL_MAX_TID_COUNT) {
2494                                 tid_data = &sta_priv->tid_data[tid];
2495                                 if (tid_data->state != IWL_AGG_OFF) {
2496                                         IWL_DEBUG_RATE(mvm,
2497                                                        "Stop aggregation on tid %d\n",
2498                                                        tid);
2499                                         ieee80211_stop_tx_ba_session(sta, tid);
2500                                 }
2501                         }
2502                         rs_set_stay_in_table(mvm, 1, lq_sta);
2503                 } else {
2504                 /* If we're in an HT mode, and all 3 mode switch actions
2505                  * have been tried and compared, stay in this best modulation
2506                  * mode for a while before next round of mode comparisons. */
2507                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2508                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2509                             (tid != IWL_MAX_TID_COUNT)) {
2510                                 tid_data = &sta_priv->tid_data[tid];
2511                                 if (tid_data->state == IWL_AGG_OFF && !ndp) {
2512                                         IWL_DEBUG_RATE(mvm,
2513                                                        "try to aggregate tid %d\n",
2514                                                        tid);
2515                                         rs_tl_turn_on_agg(mvm, tid,
2516                                                           lq_sta, sta);
2517                                 }
2518                         }
2519                         rs_set_stay_in_table(mvm, 0, lq_sta);
2520                 }
2521         }
2522 }
2523
2524 struct rs_init_rate_info {
2525         s8 rssi;
2526         u8 rate_idx;
2527 };
2528
2529 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2530         { -60, IWL_RATE_54M_INDEX },
2531         { -64, IWL_RATE_48M_INDEX },
2532         { -68, IWL_RATE_36M_INDEX },
2533         { -80, IWL_RATE_24M_INDEX },
2534         { -84, IWL_RATE_18M_INDEX },
2535         { -85, IWL_RATE_12M_INDEX },
2536         { -86, IWL_RATE_11M_INDEX },
2537         { -88, IWL_RATE_5M_INDEX  },
2538         { -90, IWL_RATE_2M_INDEX  },
2539         { S8_MIN, IWL_RATE_1M_INDEX },
2540 };
2541
2542 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2543         { -60, IWL_RATE_54M_INDEX },
2544         { -64, IWL_RATE_48M_INDEX },
2545         { -72, IWL_RATE_36M_INDEX },
2546         { -80, IWL_RATE_24M_INDEX },
2547         { -84, IWL_RATE_18M_INDEX },
2548         { -85, IWL_RATE_12M_INDEX },
2549         { -87, IWL_RATE_9M_INDEX  },
2550         { S8_MIN, IWL_RATE_6M_INDEX },
2551 };
2552
2553 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2554         { -60, IWL_RATE_MCS_7_INDEX },
2555         { -64, IWL_RATE_MCS_6_INDEX },
2556         { -68, IWL_RATE_MCS_5_INDEX },
2557         { -72, IWL_RATE_MCS_4_INDEX },
2558         { -80, IWL_RATE_MCS_3_INDEX },
2559         { -84, IWL_RATE_MCS_2_INDEX },
2560         { -85, IWL_RATE_MCS_1_INDEX },
2561         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2562 };
2563
2564 /* MCS index 9 is not valid for 20MHz VHT channel width,
2565  * but is ok for 40, 80 and 160MHz channels.
2566  */
2567 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2568         { -60, IWL_RATE_MCS_8_INDEX },
2569         { -64, IWL_RATE_MCS_7_INDEX },
2570         { -68, IWL_RATE_MCS_6_INDEX },
2571         { -72, IWL_RATE_MCS_5_INDEX },
2572         { -80, IWL_RATE_MCS_4_INDEX },
2573         { -84, IWL_RATE_MCS_3_INDEX },
2574         { -85, IWL_RATE_MCS_2_INDEX },
2575         { -87, IWL_RATE_MCS_1_INDEX },
2576         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2577 };
2578
2579 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2580         { -60, IWL_RATE_MCS_9_INDEX },
2581         { -64, IWL_RATE_MCS_8_INDEX },
2582         { -68, IWL_RATE_MCS_7_INDEX },
2583         { -72, IWL_RATE_MCS_6_INDEX },
2584         { -80, IWL_RATE_MCS_5_INDEX },
2585         { -84, IWL_RATE_MCS_4_INDEX },
2586         { -85, IWL_RATE_MCS_3_INDEX },
2587         { -87, IWL_RATE_MCS_2_INDEX },
2588         { -88, IWL_RATE_MCS_1_INDEX },
2589         { S8_MIN, IWL_RATE_MCS_0_INDEX },
2590 };
2591
2592 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2593
2594 /* Init the optimal rate based on STA caps
2595  * This combined with rssi is used to report the last tx rate
2596  * to userspace when we haven't transmitted enough frames.
2597  */
2598 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2599                                  struct ieee80211_sta *sta,
2600                                  struct iwl_lq_sta *lq_sta)
2601 {
2602         struct rs_rate *rate = &lq_sta->optimal_rate;
2603
2604         if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2605                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2606         else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2607                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2608         else if (lq_sta->band == NL80211_BAND_5GHZ)
2609                 rate->type = LQ_LEGACY_A;
2610         else
2611                 rate->type = LQ_LEGACY_G;
2612
2613         rate->bw = rs_bw_from_sta_bw(sta);
2614         rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2615
2616         /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2617
2618         if (is_mimo(rate)) {
2619                 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2620         } else if (is_siso(rate)) {
2621                 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2622         } else {
2623                 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2624
2625                 if (lq_sta->band == NL80211_BAND_5GHZ) {
2626                         lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2627                         lq_sta->optimal_nentries =
2628                                 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2629                 } else {
2630                         lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2631                         lq_sta->optimal_nentries =
2632                                 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2633                 }
2634         }
2635
2636         if (is_vht(rate)) {
2637                 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2638                         lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2639                         lq_sta->optimal_nentries =
2640                                 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2641                 } else {
2642                         lq_sta->optimal_rates = rs_optimal_rates_vht;
2643                         lq_sta->optimal_nentries =
2644                                 ARRAY_SIZE(rs_optimal_rates_vht);
2645                 }
2646         } else if (is_ht(rate)) {
2647                 lq_sta->optimal_rates = rs_optimal_rates_ht;
2648                 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2649         }
2650 }
2651
2652 /* Compute the optimal rate index based on RSSI */
2653 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2654                                            struct iwl_lq_sta *lq_sta)
2655 {
2656         struct rs_rate *rate = &lq_sta->optimal_rate;
2657         int i;
2658
2659         rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2660                                      BITS_PER_LONG);
2661
2662         for (i = 0; i < lq_sta->optimal_nentries; i++) {
2663                 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2664
2665                 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2666                     (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2667                         rate->index = rate_idx;
2668                         break;
2669                 }
2670         }
2671
2672         return rate;
2673 }
2674
2675 /* Choose an initial legacy rate and antenna to use based on the RSSI
2676  * of last Rx
2677  */
2678 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2679                                 struct ieee80211_sta *sta,
2680                                 struct iwl_lq_sta *lq_sta,
2681                                 enum nl80211_band band,
2682                                 struct rs_rate *rate)
2683 {
2684         int i, nentries;
2685         unsigned long active_rate;
2686         s8 best_rssi = S8_MIN;
2687         u8 best_ant = ANT_NONE;
2688         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2689         const struct rs_init_rate_info *initial_rates;
2690
2691         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2692                 if (!(lq_sta->pers.chains & BIT(i)))
2693                         continue;
2694
2695                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2696                         best_rssi = lq_sta->pers.chain_signal[i];
2697                         best_ant = BIT(i);
2698                 }
2699         }
2700
2701         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2702                        rs_pretty_ant(best_ant), best_rssi);
2703
2704         if (best_ant != ANT_A && best_ant != ANT_B)
2705                 rate->ant = first_antenna(valid_tx_ant);
2706         else
2707                 rate->ant = best_ant;
2708
2709         rate->sgi = false;
2710         rate->ldpc = false;
2711         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2712
2713         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2714                                      BITS_PER_LONG);
2715
2716         if (band == NL80211_BAND_5GHZ) {
2717                 rate->type = LQ_LEGACY_A;
2718                 initial_rates = rs_optimal_rates_5ghz_legacy;
2719                 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2720         } else {
2721                 rate->type = LQ_LEGACY_G;
2722                 initial_rates = rs_optimal_rates_24ghz_legacy;
2723                 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2724         }
2725
2726         if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2727                 goto out;
2728
2729         /* Start from a higher rate if the corresponding debug capability
2730          * is enabled. The rate is chosen according to AP capabilities.
2731          * In case of VHT/HT when the rssi is low fallback to the case of
2732          * legacy rates.
2733          */
2734         if (sta->vht_cap.vht_supported &&
2735             best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2736                 switch (sta->bandwidth) {
2737                 case IEEE80211_STA_RX_BW_160:
2738                 case IEEE80211_STA_RX_BW_80:
2739                 case IEEE80211_STA_RX_BW_40:
2740                         initial_rates = rs_optimal_rates_vht;
2741                         nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2742                         break;
2743                 case IEEE80211_STA_RX_BW_20:
2744                         initial_rates = rs_optimal_rates_vht_20mhz;
2745                         nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2746                         break;
2747                 default:
2748                         IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2749                         goto out;
2750                 }
2751
2752                 active_rate = lq_sta->active_siso_rate;
2753                 rate->type = LQ_VHT_SISO;
2754                 rate->bw = rs_bw_from_sta_bw(sta);
2755         } else if (sta->ht_cap.ht_supported &&
2756                    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2757                 initial_rates = rs_optimal_rates_ht;
2758                 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2759                 active_rate = lq_sta->active_siso_rate;
2760                 rate->type = LQ_HT_SISO;
2761         } else {
2762                 active_rate = lq_sta->active_legacy_rate;
2763         }
2764
2765         for (i = 0; i < nentries; i++) {
2766                 int rate_idx = initial_rates[i].rate_idx;
2767
2768                 if ((best_rssi >= initial_rates[i].rssi) &&
2769                     (BIT(rate_idx) & active_rate)) {
2770                         rate->index = rate_idx;
2771                         break;
2772                 }
2773         }
2774
2775 out:
2776         rs_dump_rate(mvm, rate, "INITIAL");
2777 }
2778
2779 /* Save info about RSSI of last Rx */
2780 void rs_update_last_rssi(struct iwl_mvm *mvm,
2781                          struct iwl_lq_sta *lq_sta,
2782                          struct ieee80211_rx_status *rx_status)
2783 {
2784         int i;
2785
2786         lq_sta->pers.chains = rx_status->chains;
2787         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2788         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2789         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2790         lq_sta->pers.last_rssi = S8_MIN;
2791
2792         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2793                 if (!(lq_sta->pers.chains & BIT(i)))
2794                         continue;
2795
2796                 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2797                         lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2798         }
2799 }
2800
2801 /**
2802  * rs_initialize_lq - Initialize a station's hardware rate table
2803  *
2804  * The uCode's station table contains a table of fallback rates
2805  * for automatic fallback during transmission.
2806  *
2807  * NOTE: This sets up a default set of values.  These will be replaced later
2808  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2809  *       rc80211_simple.
2810  *
2811  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2812  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2813  *       which requires station table entry to exist).
2814  */
2815 static void rs_initialize_lq(struct iwl_mvm *mvm,
2816                              struct ieee80211_sta *sta,
2817                              struct iwl_lq_sta *lq_sta,
2818                              enum nl80211_band band,
2819                              bool init)
2820 {
2821         struct iwl_scale_tbl_info *tbl;
2822         struct rs_rate *rate;
2823         u8 active_tbl = 0;
2824
2825         if (!sta || !lq_sta)
2826                 return;
2827
2828         if (!lq_sta->search_better_tbl)
2829                 active_tbl = lq_sta->active_tbl;
2830         else
2831                 active_tbl = 1 - lq_sta->active_tbl;
2832
2833         tbl = &(lq_sta->lq_info[active_tbl]);
2834         rate = &tbl->rate;
2835
2836         rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2837         rs_init_optimal_rate(mvm, sta, lq_sta);
2838
2839         WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2840                   "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2841                   rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2842                   mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2843
2844         tbl->column = rs_get_column_from_rate(rate);
2845
2846         rs_set_expected_tpt_table(lq_sta, tbl);
2847         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2848         /* TODO restore station should remember the lq cmd */
2849         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2850 }
2851
2852 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2853                         struct ieee80211_tx_rate_control *txrc)
2854 {
2855         struct sk_buff *skb = txrc->skb;
2856         struct iwl_op_mode *op_mode __maybe_unused =
2857                         (struct iwl_op_mode *)mvm_r;
2858         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2859         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2860         struct iwl_lq_sta *lq_sta = mvm_sta;
2861         struct rs_rate *optimal_rate;
2862         u32 last_ucode_rate;
2863
2864         if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2865                 /* if vif isn't initialized mvm doesn't know about
2866                  * this station, so don't do anything with the it
2867                  */
2868                 sta = NULL;
2869                 mvm_sta = NULL;
2870         }
2871
2872         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2873
2874         /* Treat uninitialized rate scaling data same as non-existing. */
2875         if (lq_sta && !lq_sta->pers.drv) {
2876                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2877                 mvm_sta = NULL;
2878         }
2879
2880         /* Send management frames and NO_ACK data using lowest rate. */
2881         if (rate_control_send_low(sta, mvm_sta, txrc))
2882                 return;
2883
2884         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2885                                   info->band, &info->control.rates[0]);
2886         info->control.rates[0].count = 1;
2887
2888         /* Report the optimal rate based on rssi and STA caps if we haven't
2889          * converged yet (too little traffic) or exploring other modulations
2890          */
2891         if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2892                 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2893                 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2894                                                           optimal_rate);
2895                 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2896                                           &txrc->reported_rate);
2897         }
2898 }
2899
2900 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2901                           gfp_t gfp)
2902 {
2903         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2904         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2905         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2906         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2907
2908         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2909
2910         lq_sta->pers.drv = mvm;
2911 #ifdef CONFIG_MAC80211_DEBUGFS
2912         lq_sta->pers.dbg_fixed_rate = 0;
2913         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2914         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2915 #endif
2916         lq_sta->pers.chains = 0;
2917         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2918         lq_sta->pers.last_rssi = S8_MIN;
2919
2920         return &sta_priv->lq_sta;
2921 }
2922
2923 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2924                                        int nss)
2925 {
2926         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2927                 (0x3 << (2 * (nss - 1)));
2928         rx_mcs >>= (2 * (nss - 1));
2929
2930         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2931                 return IWL_RATE_MCS_7_INDEX;
2932         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2933                 return IWL_RATE_MCS_8_INDEX;
2934         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2935                 return IWL_RATE_MCS_9_INDEX;
2936
2937         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2938         return -1;
2939 }
2940
2941 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2942                                      struct ieee80211_sta_vht_cap *vht_cap,
2943                                      struct iwl_lq_sta *lq_sta)
2944 {
2945         int i;
2946         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2947
2948         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2949                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2950                         if (i == IWL_RATE_9M_INDEX)
2951                                 continue;
2952
2953                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2954                         if (i == IWL_RATE_MCS_9_INDEX &&
2955                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2956                                 continue;
2957
2958                         lq_sta->active_siso_rate |= BIT(i);
2959                 }
2960         }
2961
2962         if (sta->rx_nss < 2)
2963                 return;
2964
2965         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2966         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2967                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2968                         if (i == IWL_RATE_9M_INDEX)
2969                                 continue;
2970
2971                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2972                         if (i == IWL_RATE_MCS_9_INDEX &&
2973                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2974                                 continue;
2975
2976                         lq_sta->active_mimo2_rate |= BIT(i);
2977                 }
2978         }
2979 }
2980
2981 static void rs_ht_init(struct iwl_mvm *mvm,
2982                        struct ieee80211_sta *sta,
2983                        struct iwl_lq_sta *lq_sta,
2984                        struct ieee80211_sta_ht_cap *ht_cap)
2985 {
2986         /* active_siso_rate mask includes 9 MBits (bit 5),
2987          * and CCK (bits 0-3), supp_rates[] does not;
2988          * shift to convert format, force 9 MBits off.
2989          */
2990         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2991         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2992         lq_sta->active_siso_rate &= ~((u16)0x2);
2993         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2994
2995         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2996         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2997         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2998         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2999
3000         if (mvm->cfg->ht_params->ldpc &&
3001             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
3002                 lq_sta->ldpc = true;
3003
3004         if (mvm->cfg->ht_params->stbc &&
3005             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3006             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3007                 lq_sta->stbc_capable = true;
3008
3009         lq_sta->is_vht = false;
3010 }
3011
3012 static void rs_vht_init(struct iwl_mvm *mvm,
3013                         struct ieee80211_sta *sta,
3014                         struct iwl_lq_sta *lq_sta,
3015                         struct ieee80211_sta_vht_cap *vht_cap)
3016 {
3017         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
3018
3019         if (mvm->cfg->ht_params->ldpc &&
3020             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3021                 lq_sta->ldpc = true;
3022
3023         if (mvm->cfg->ht_params->stbc &&
3024             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3025             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3026                 lq_sta->stbc_capable = true;
3027
3028         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3029             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3030             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3031                 lq_sta->bfer_capable = true;
3032
3033         lq_sta->is_vht = true;
3034 }
3035
3036 #ifdef CONFIG_IWLWIFI_DEBUGFS
3037 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3038 {
3039         spin_lock_bh(&mvm->drv_stats_lock);
3040         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3041         spin_unlock_bh(&mvm->drv_stats_lock);
3042 }
3043
3044 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3045 {
3046         u8 nss = 0;
3047
3048         spin_lock(&mvm->drv_stats_lock);
3049
3050         if (agg)
3051                 mvm->drv_rx_stats.agg_frames++;
3052
3053         mvm->drv_rx_stats.success_frames++;
3054
3055         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3056         case RATE_MCS_CHAN_WIDTH_20:
3057                 mvm->drv_rx_stats.bw_20_frames++;
3058                 break;
3059         case RATE_MCS_CHAN_WIDTH_40:
3060                 mvm->drv_rx_stats.bw_40_frames++;
3061                 break;
3062         case RATE_MCS_CHAN_WIDTH_80:
3063                 mvm->drv_rx_stats.bw_80_frames++;
3064                 break;
3065         case RATE_MCS_CHAN_WIDTH_160:
3066                 mvm->drv_rx_stats.bw_160_frames++;
3067                 break;
3068         default:
3069                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3070         }
3071
3072         if (rate & RATE_MCS_HT_MSK) {
3073                 mvm->drv_rx_stats.ht_frames++;
3074                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3075         } else if (rate & RATE_MCS_VHT_MSK) {
3076                 mvm->drv_rx_stats.vht_frames++;
3077                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3078                        RATE_VHT_MCS_NSS_POS) + 1;
3079         } else {
3080                 mvm->drv_rx_stats.legacy_frames++;
3081         }
3082
3083         if (nss == 1)
3084                 mvm->drv_rx_stats.siso_frames++;
3085         else if (nss == 2)
3086                 mvm->drv_rx_stats.mimo2_frames++;
3087
3088         if (rate & RATE_MCS_SGI_MSK)
3089                 mvm->drv_rx_stats.sgi_frames++;
3090         else
3091                 mvm->drv_rx_stats.ngi_frames++;
3092
3093         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3094         mvm->drv_rx_stats.last_frame_idx =
3095                 (mvm->drv_rx_stats.last_frame_idx + 1) %
3096                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3097
3098         spin_unlock(&mvm->drv_stats_lock);
3099 }
3100 #endif
3101
3102 /*
3103  * Called after adding a new station to initialize rate scaling
3104  */
3105 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3106                           enum nl80211_band band, bool init)
3107 {
3108         int i, j;
3109         struct ieee80211_hw *hw = mvm->hw;
3110         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3111         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3112         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
3113         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
3114         struct ieee80211_supported_band *sband;
3115         unsigned long supp; /* must be unsigned long for for_each_set_bit */
3116
3117         /* clear all non-persistent lq data */
3118         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3119
3120         sband = hw->wiphy->bands[band];
3121
3122         lq_sta->lq.sta_id = sta_priv->sta_id;
3123         sta_priv->tlc_amsdu = false;
3124
3125         for (j = 0; j < LQ_SIZE; j++)
3126                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3127
3128         lq_sta->flush_timer = 0;
3129         lq_sta->last_tx = jiffies;
3130
3131         IWL_DEBUG_RATE(mvm,
3132                        "LQ: *** rate scale station global init for station %d ***\n",
3133                        sta_priv->sta_id);
3134         /* TODO: what is a good starting rate for STA? About middle? Maybe not
3135          * the lowest or the highest rate.. Could consider using RSSI from
3136          * previous packets? Need to have IEEE 802.1X auth succeed immediately
3137          * after assoc.. */
3138
3139         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3140         lq_sta->band = sband->band;
3141         /*
3142          * active legacy rates as per supported rates bitmap
3143          */
3144         supp = sta->supp_rates[sband->band];
3145         lq_sta->active_legacy_rate = 0;
3146         for_each_set_bit(i, &supp, BITS_PER_LONG)
3147                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3148
3149         /* TODO: should probably account for rx_highest for both HT/VHT */
3150         if (!vht_cap || !vht_cap->vht_supported)
3151                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3152         else
3153                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3154
3155         lq_sta->max_legacy_rate_idx =
3156                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3157         lq_sta->max_siso_rate_idx =
3158                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3159         lq_sta->max_mimo2_rate_idx =
3160                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3161
3162         IWL_DEBUG_RATE(mvm,
3163                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3164                        lq_sta->active_legacy_rate,
3165                        lq_sta->active_siso_rate,
3166                        lq_sta->active_mimo2_rate,
3167                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3168                        lq_sta->bfer_capable);
3169         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3170                        lq_sta->max_legacy_rate_idx,
3171                        lq_sta->max_siso_rate_idx,
3172                        lq_sta->max_mimo2_rate_idx);
3173
3174         /* These values will be overridden later */
3175         lq_sta->lq.single_stream_ant_msk =
3176                 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3177         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3178
3179         /* as default allow aggregation for all tids */
3180         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3181         lq_sta->is_agg = 0;
3182 #ifdef CONFIG_IWLWIFI_DEBUGFS
3183         iwl_mvm_reset_frame_stats(mvm);
3184 #endif
3185         rs_initialize_lq(mvm, sta, lq_sta, band, init);
3186 }
3187
3188 static void rs_rate_update(void *mvm_r,
3189                            struct ieee80211_supported_band *sband,
3190                            struct cfg80211_chan_def *chandef,
3191                            struct ieee80211_sta *sta, void *priv_sta,
3192                            u32 changed)
3193 {
3194         u8 tid;
3195         struct iwl_op_mode *op_mode  =
3196                         (struct iwl_op_mode *)mvm_r;
3197         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3198
3199         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3200                 return;
3201
3202         /* Stop any ongoing aggregations as rs starts off assuming no agg */
3203         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3204                 ieee80211_stop_tx_ba_session(sta, tid);
3205
3206         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3207 }
3208
3209 #ifdef CONFIG_MAC80211_DEBUGFS
3210 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3211                                             struct iwl_lq_cmd *lq_cmd,
3212                                             enum nl80211_band band,
3213                                             u32 ucode_rate)
3214 {
3215         struct rs_rate rate;
3216         int i;
3217         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3218         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3219         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3220
3221         for (i = 0; i < num_rates; i++)
3222                 lq_cmd->rs_table[i] = ucode_rate_le32;
3223
3224         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
3225
3226         if (is_mimo(&rate))
3227                 lq_cmd->mimo_delim = num_rates - 1;
3228         else
3229                 lq_cmd->mimo_delim = 0;
3230
3231         lq_cmd->reduced_tpc = 0;
3232
3233         if (num_of_ant(ant) == 1)
3234                 lq_cmd->single_stream_ant_msk = ant;
3235
3236         if (!mvm->trans->cfg->gen2)
3237                 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3238         else
3239                 lq_cmd->agg_frame_cnt_limit =
3240                         LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3241 }
3242 #endif /* CONFIG_MAC80211_DEBUGFS */
3243
3244 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3245                                      struct iwl_lq_sta *lq_sta,
3246                                      struct rs_rate *rate,
3247                                      __le32 *rs_table, int *rs_table_index,
3248                                      int num_rates, int num_retries,
3249                                      u8 valid_tx_ant, bool toggle_ant)
3250 {
3251         int i, j;
3252         __le32 ucode_rate;
3253         bool bottom_reached = false;
3254         int prev_rate_idx = rate->index;
3255         int end = LINK_QUAL_MAX_RETRY_NUM;
3256         int index = *rs_table_index;
3257
3258         for (i = 0; i < num_rates && index < end; i++) {
3259                 for (j = 0; j < num_retries && index < end; j++, index++) {
3260                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3261                                                                          rate));
3262                         rs_table[index] = ucode_rate;
3263                         if (toggle_ant)
3264                                 rs_toggle_antenna(valid_tx_ant, rate);
3265                 }
3266
3267                 prev_rate_idx = rate->index;
3268                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3269                 if (bottom_reached && !is_legacy(rate))
3270                         break;
3271         }
3272
3273         if (!bottom_reached && !is_legacy(rate))
3274                 rate->index = prev_rate_idx;
3275
3276         *rs_table_index = index;
3277 }
3278
3279 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3280  * column the rate table should look like this:
3281  *
3282  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3283  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3284  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3285  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3286  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3287  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3288  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3289  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3290  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3291  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3292  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3293  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3294  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3295  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3296  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3297  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3298  */
3299 static void rs_build_rates_table(struct iwl_mvm *mvm,
3300                                  struct ieee80211_sta *sta,
3301                                  struct iwl_lq_sta *lq_sta,
3302                                  const struct rs_rate *initial_rate)
3303 {
3304         struct rs_rate rate;
3305         int num_rates, num_retries, index = 0;
3306         u8 valid_tx_ant = 0;
3307         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3308         bool toggle_ant = false;
3309         u32 color;
3310
3311         memcpy(&rate, initial_rate, sizeof(rate));
3312
3313         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3314
3315         /* TODO: remove old API when min FW API hits 14 */
3316         if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3317             rs_stbc_allow(mvm, sta, lq_sta))
3318                 rate.stbc = true;
3319
3320         if (is_siso(&rate)) {
3321                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3322                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3323         } else if (is_mimo(&rate)) {
3324                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3325                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3326         } else {
3327                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3328                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3329                 toggle_ant = true;
3330         }
3331
3332         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3333                                  num_rates, num_retries, valid_tx_ant,
3334                                  toggle_ant);
3335
3336         rs_get_lower_rate_down_column(lq_sta, &rate);
3337
3338         if (is_siso(&rate)) {
3339                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3340                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3341                 lq_cmd->mimo_delim = index;
3342         } else if (is_legacy(&rate)) {
3343                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3344                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3345         } else {
3346                 WARN_ON_ONCE(1);
3347         }
3348
3349         toggle_ant = true;
3350
3351         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3352                                  num_rates, num_retries, valid_tx_ant,
3353                                  toggle_ant);
3354
3355         rs_get_lower_rate_down_column(lq_sta, &rate);
3356
3357         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3358         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3359
3360         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3361                                  num_rates, num_retries, valid_tx_ant,
3362                                  toggle_ant);
3363
3364         /* update the color of the LQ command (as a counter at bits 1-3) */
3365         color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3366         lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3367 }
3368
3369 struct rs_bfer_active_iter_data {
3370         struct ieee80211_sta *exclude_sta;
3371         struct iwl_mvm_sta *bfer_mvmsta;
3372 };
3373
3374 static void rs_bfer_active_iter(void *_data,
3375                                 struct ieee80211_sta *sta)
3376 {
3377         struct rs_bfer_active_iter_data *data = _data;
3378         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3379         struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3380         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3381
3382         if (sta == data->exclude_sta)
3383                 return;
3384
3385         /* The current sta has BFER allowed */
3386         if (ss_params & LQ_SS_BFER_ALLOWED) {
3387                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3388
3389                 data->bfer_mvmsta = mvmsta;
3390         }
3391 }
3392
3393 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3394 {
3395         int prio = -1;
3396         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3397
3398         switch (viftype) {
3399         case NL80211_IFTYPE_AP:
3400         case NL80211_IFTYPE_P2P_GO:
3401                 prio = 3;
3402                 break;
3403         case NL80211_IFTYPE_P2P_CLIENT:
3404                 prio = 2;
3405                 break;
3406         case NL80211_IFTYPE_STATION:
3407                 prio = 1;
3408                 break;
3409         default:
3410                 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3411                 prio = -1;
3412         }
3413
3414         return prio;
3415 }
3416
3417 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3418 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3419                                 struct iwl_mvm_sta *sta2)
3420 {
3421         int prio1 = rs_bfer_priority(sta1);
3422         int prio2 = rs_bfer_priority(sta2);
3423
3424         if (prio1 > prio2)
3425                 return 1;
3426         if (prio1 < prio2)
3427                 return -1;
3428         return 0;
3429 }
3430
3431 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3432                                 struct ieee80211_sta *sta,
3433                                 struct iwl_lq_sta *lq_sta,
3434                                 const struct rs_rate *initial_rate)
3435 {
3436         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3437         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3438         struct rs_bfer_active_iter_data data = {
3439                 .exclude_sta = sta,
3440                 .bfer_mvmsta = NULL,
3441         };
3442         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3443         u32 ss_params = LQ_SS_PARAMS_VALID;
3444
3445         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3446                 goto out;
3447
3448 #ifdef CONFIG_MAC80211_DEBUGFS
3449         /* Check if forcing the decision is configured.
3450          * Note that SISO is forced by not allowing STBC or BFER
3451          */
3452         if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3453                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3454         else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3455                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3456
3457         if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3458                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3459                                lq_sta->pers.ss_force);
3460                 goto out;
3461         }
3462 #endif
3463
3464         if (lq_sta->stbc_capable)
3465                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3466
3467         if (!lq_sta->bfer_capable)
3468                 goto out;
3469
3470         ieee80211_iterate_stations_atomic(mvm->hw,
3471                                           rs_bfer_active_iter,
3472                                           &data);
3473         bfer_mvmsta = data.bfer_mvmsta;
3474
3475         /* This code is safe as it doesn't run concurrently for different
3476          * stations. This is guaranteed by the fact that calls to
3477          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3478          */
3479         if (!bfer_mvmsta) {
3480                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3481
3482                 ss_params |= LQ_SS_BFER_ALLOWED;
3483                 goto out;
3484         }
3485
3486         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3487                        bfer_mvmsta->sta_id);
3488
3489         /* Disallow BFER on another STA if active and we're a higher priority */
3490         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3491                 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3492                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3493
3494                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3495                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3496                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3497
3498                 ss_params |= LQ_SS_BFER_ALLOWED;
3499                 IWL_DEBUG_RATE(mvm,
3500                                "Lower priority BFER sta found (%d). Switch BFER\n",
3501                                bfer_mvmsta->sta_id);
3502         }
3503 out:
3504         lq_cmd->ss_params = cpu_to_le32(ss_params);
3505 }
3506
3507 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3508                            struct ieee80211_sta *sta,
3509                            struct iwl_lq_sta *lq_sta,
3510                            const struct rs_rate *initial_rate)
3511 {
3512         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3513         struct iwl_mvm_sta *mvmsta;
3514         struct iwl_mvm_vif *mvmvif;
3515
3516         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3517         lq_cmd->agg_time_limit =
3518                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3519
3520 #ifdef CONFIG_MAC80211_DEBUGFS
3521         if (lq_sta->pers.dbg_fixed_rate) {
3522                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3523                                                 lq_sta->band,
3524                                                 lq_sta->pers.dbg_fixed_rate);
3525                 return;
3526         }
3527 #endif
3528         if (WARN_ON_ONCE(!sta || !initial_rate))
3529                 return;
3530
3531         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3532
3533         if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3534                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3535
3536         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3537         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3538
3539         if (num_of_ant(initial_rate->ant) == 1)
3540                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3541
3542         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3543
3544         /*
3545          * In case of low latency, tell the firmware to leave a frame in the
3546          * Tx Fifo so that it can start a transaction in the same TxOP. This
3547          * basically allows the firmware to send bursts.
3548          */
3549         if (iwl_mvm_vif_low_latency(mvmvif))
3550                 lq_cmd->agg_frame_cnt_limit--;
3551
3552         if (mvmsta->vif->p2p)
3553                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3554
3555         lq_cmd->agg_time_limit =
3556                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3557 }
3558
3559 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3560 {
3561         return hw->priv;
3562 }
3563 /* rate scale requires free function to be implemented */
3564 static void rs_free(void *mvm_rate)
3565 {
3566         return;
3567 }
3568
3569 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3570                         void *mvm_sta)
3571 {
3572         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3573         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3574
3575         IWL_DEBUG_RATE(mvm, "enter\n");
3576         IWL_DEBUG_RATE(mvm, "leave\n");
3577 }
3578
3579 #ifdef CONFIG_MAC80211_DEBUGFS
3580 int rs_pretty_print_rate(char *buf, const u32 rate)
3581 {
3582
3583         char *type, *bw;
3584         u8 mcs = 0, nss = 0;
3585         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3586
3587         if (!(rate & RATE_MCS_HT_MSK) &&
3588             !(rate & RATE_MCS_VHT_MSK)) {
3589                 int index = iwl_hwrate_to_plcp_idx(rate);
3590
3591                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3592                                rs_pretty_ant(ant),
3593                                index == IWL_RATE_INVALID ? "BAD" :
3594                                iwl_rate_mcs[index].mbps);
3595         }
3596
3597         if (rate & RATE_MCS_VHT_MSK) {
3598                 type = "VHT";
3599                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3600                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3601                        >> RATE_VHT_MCS_NSS_POS) + 1;
3602         } else if (rate & RATE_MCS_HT_MSK) {
3603                 type = "HT";
3604                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3605                 nss = ((rate & RATE_HT_MCS_NSS_MSK)
3606                        >> RATE_HT_MCS_NSS_POS) + 1;
3607         } else {
3608                 type = "Unknown"; /* shouldn't happen */
3609         }
3610
3611         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3612         case RATE_MCS_CHAN_WIDTH_20:
3613                 bw = "20Mhz";
3614                 break;
3615         case RATE_MCS_CHAN_WIDTH_40:
3616                 bw = "40Mhz";
3617                 break;
3618         case RATE_MCS_CHAN_WIDTH_80:
3619                 bw = "80Mhz";
3620                 break;
3621         case RATE_MCS_CHAN_WIDTH_160:
3622                 bw = "160Mhz";
3623                 break;
3624         default:
3625                 bw = "BAD BW";
3626         }
3627
3628         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n",
3629                        type, rs_pretty_ant(ant), bw, mcs, nss,
3630                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3631                        (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3632                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3633                        (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3634 }
3635
3636 /**
3637  * Program the device to use fixed rate for frame transmit
3638  * This is for debugging/testing only
3639  * once the device start use fixed rate, we need to reload the module
3640  * to being back the normal operation.
3641  */
3642 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3643                                 struct iwl_lq_sta *lq_sta)
3644 {
3645         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3646         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3647         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3648
3649         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3650                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3651
3652         if (lq_sta->pers.dbg_fixed_rate) {
3653                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3654                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3655         }
3656 }
3657
3658 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3659                         const char __user *user_buf, size_t count, loff_t *ppos)
3660 {
3661         struct iwl_lq_sta *lq_sta = file->private_data;
3662         struct iwl_mvm *mvm;
3663         char buf[64];
3664         size_t buf_size;
3665         u32 parsed_rate;
3666
3667         mvm = lq_sta->pers.drv;
3668         memset(buf, 0, sizeof(buf));
3669         buf_size = min(count, sizeof(buf) -  1);
3670         if (copy_from_user(buf, user_buf, buf_size))
3671                 return -EFAULT;
3672
3673         if (sscanf(buf, "%x", &parsed_rate) == 1)
3674                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3675         else
3676                 lq_sta->pers.dbg_fixed_rate = 0;
3677
3678         rs_program_fix_rate(mvm, lq_sta);
3679
3680         return count;
3681 }
3682
3683 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3684                         char __user *user_buf, size_t count, loff_t *ppos)
3685 {
3686         char *buff;
3687         int desc = 0;
3688         int i = 0;
3689         ssize_t ret;
3690
3691         struct iwl_lq_sta *lq_sta = file->private_data;
3692         struct iwl_mvm_sta *mvmsta =
3693                 container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3694         struct iwl_mvm *mvm;
3695         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3696         struct rs_rate *rate = &tbl->rate;
3697         u32 ss_params;
3698
3699         mvm = lq_sta->pers.drv;
3700         buff = kmalloc(2048, GFP_KERNEL);
3701         if (!buff)
3702                 return -ENOMEM;
3703
3704         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3705         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3706                         lq_sta->total_failed, lq_sta->total_success,
3707                         lq_sta->active_legacy_rate);
3708         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3709                         lq_sta->pers.dbg_fixed_rate);
3710         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3711             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3712             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3713             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3714         desc += sprintf(buff+desc, "lq type %s\n",
3715                         (is_legacy(rate)) ? "legacy" :
3716                         is_vht(rate) ? "VHT" : "HT");
3717         if (!is_legacy(rate)) {
3718                 desc += sprintf(buff + desc, " %s",
3719                    (is_siso(rate)) ? "SISO" : "MIMO2");
3720                 desc += sprintf(buff + desc, " %s",
3721                                 (is_ht20(rate)) ? "20MHz" :
3722                                 (is_ht40(rate)) ? "40MHz" :
3723                                 (is_ht80(rate)) ? "80MHz" :
3724                                 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3725                 desc += sprintf(buff + desc, " %s %s %s %s\n",
3726                                 (rate->sgi) ? "SGI" : "NGI",
3727                                 (rate->ldpc) ? "LDPC" : "BCC",
3728                                 (lq_sta->is_agg) ? "AGG on" : "",
3729                                 (mvmsta->tlc_amsdu) ? "AMSDU on" : "");
3730         }
3731         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3732                         lq_sta->last_rate_n_flags);
3733         desc += sprintf(buff+desc,
3734                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3735                         lq_sta->lq.flags,
3736                         lq_sta->lq.mimo_delim,
3737                         lq_sta->lq.single_stream_ant_msk,
3738                         lq_sta->lq.dual_stream_ant_msk);
3739
3740         desc += sprintf(buff+desc,
3741                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3742                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3743                         lq_sta->lq.agg_disable_start_th,
3744                         lq_sta->lq.agg_frame_cnt_limit);
3745
3746         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3747         ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3748         desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3749                         (ss_params & LQ_SS_PARAMS_VALID) ?
3750                         "VALID" : "INVALID",
3751                         (ss_params & LQ_SS_BFER_ALLOWED) ?
3752                         ", BFER" : "",
3753                         (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3754                         ", STBC" : "",
3755                         (ss_params & LQ_SS_FORCE) ?
3756                         ", FORCE" : "");
3757         desc += sprintf(buff+desc,
3758                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3759                         lq_sta->lq.initial_rate_index[0],
3760                         lq_sta->lq.initial_rate_index[1],
3761                         lq_sta->lq.initial_rate_index[2],
3762                         lq_sta->lq.initial_rate_index[3]);
3763
3764         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3765                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3766
3767                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3768                 desc += rs_pretty_print_rate(buff+desc, r);
3769         }
3770
3771         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3772         kfree(buff);
3773         return ret;
3774 }
3775
3776 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3777         .write = rs_sta_dbgfs_scale_table_write,
3778         .read = rs_sta_dbgfs_scale_table_read,
3779         .open = simple_open,
3780         .llseek = default_llseek,
3781 };
3782 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3783                         char __user *user_buf, size_t count, loff_t *ppos)
3784 {
3785         char *buff;
3786         int desc = 0;
3787         int i, j;
3788         ssize_t ret;
3789         struct iwl_scale_tbl_info *tbl;
3790         struct rs_rate *rate;
3791         struct iwl_lq_sta *lq_sta = file->private_data;
3792
3793         buff = kmalloc(1024, GFP_KERNEL);
3794         if (!buff)
3795                 return -ENOMEM;
3796
3797         for (i = 0; i < LQ_SIZE; i++) {
3798                 tbl = &(lq_sta->lq_info[i]);
3799                 rate = &tbl->rate;
3800                 desc += sprintf(buff+desc,
3801                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3802                                 "index=%d\n",
3803                                 lq_sta->active_tbl == i ? "*" : "x",
3804                                 rate->type,
3805                                 rate->sgi,
3806                                 is_ht20(rate) ? "20MHz" :
3807                                 is_ht40(rate) ? "40MHz" :
3808                                 is_ht80(rate) ? "80MHz" :
3809                                 is_ht160(rate) ? "160MHz" : "ERR",
3810                                 rate->index);
3811                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3812                         desc += sprintf(buff+desc,
3813                                 "counter=%d success=%d %%=%d\n",
3814                                 tbl->win[j].counter,
3815                                 tbl->win[j].success_counter,
3816                                 tbl->win[j].success_ratio);
3817                 }
3818         }
3819         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3820         kfree(buff);
3821         return ret;
3822 }
3823
3824 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3825         .read = rs_sta_dbgfs_stats_table_read,
3826         .open = simple_open,
3827         .llseek = default_llseek,
3828 };
3829
3830 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3831                                               char __user *user_buf,
3832                                               size_t count, loff_t *ppos)
3833 {
3834         static const char * const column_name[] = {
3835                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3836                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3837                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3838                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3839                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3840                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3841                 [RS_COLUMN_MIMO2] = "MIMO2",
3842                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3843         };
3844
3845         static const char * const rate_name[] = {
3846                 [IWL_RATE_1M_INDEX] = "1M",
3847                 [IWL_RATE_2M_INDEX] = "2M",
3848                 [IWL_RATE_5M_INDEX] = "5.5M",
3849                 [IWL_RATE_11M_INDEX] = "11M",
3850                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3851                 [IWL_RATE_9M_INDEX] = "9M",
3852                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3853                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3854                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3855                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3856                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3857                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3858                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3859                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3860                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3861         };
3862
3863         char *buff, *pos, *endpos;
3864         int col, rate;
3865         ssize_t ret;
3866         struct iwl_lq_sta *lq_sta = file->private_data;
3867         struct rs_rate_stats *stats;
3868         static const size_t bufsz = 1024;
3869
3870         buff = kmalloc(bufsz, GFP_KERNEL);
3871         if (!buff)
3872                 return -ENOMEM;
3873
3874         pos = buff;
3875         endpos = pos + bufsz;
3876
3877         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3878         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3879                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3880         pos += scnprintf(pos, endpos - pos, "\n");
3881
3882         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3883                 pos += scnprintf(pos, endpos - pos,
3884                                  "%s,", column_name[col]);
3885
3886                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3887                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3888                         pos += scnprintf(pos, endpos - pos,
3889                                          "%llu/%llu,",
3890                                          stats->success,
3891                                          stats->total);
3892                 }
3893                 pos += scnprintf(pos, endpos - pos, "\n");
3894         }
3895
3896         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3897         kfree(buff);
3898         return ret;
3899 }
3900
3901 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3902                                                const char __user *user_buf,
3903                                                size_t count, loff_t *ppos)
3904 {
3905         struct iwl_lq_sta *lq_sta = file->private_data;
3906         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3907
3908         return count;
3909 }
3910
3911 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3912         .read = rs_sta_dbgfs_drv_tx_stats_read,
3913         .write = rs_sta_dbgfs_drv_tx_stats_write,
3914         .open = simple_open,
3915         .llseek = default_llseek,
3916 };
3917
3918 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3919                                        char __user *user_buf,
3920                                        size_t count, loff_t *ppos)
3921 {
3922         struct iwl_lq_sta *lq_sta = file->private_data;
3923         char buf[12];
3924         int bufsz = sizeof(buf);
3925         int pos = 0;
3926         static const char * const ss_force_name[] = {
3927                 [RS_SS_FORCE_NONE] = "none",
3928                 [RS_SS_FORCE_STBC] = "stbc",
3929                 [RS_SS_FORCE_BFER] = "bfer",
3930                 [RS_SS_FORCE_SISO] = "siso",
3931         };
3932
3933         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3934                          ss_force_name[lq_sta->pers.ss_force]);
3935         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3936 }
3937
3938 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3939                                         size_t count, loff_t *ppos)
3940 {
3941         struct iwl_mvm *mvm = lq_sta->pers.drv;
3942         int ret = 0;
3943
3944         if (!strncmp("none", buf, 4)) {
3945                 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3946         } else if (!strncmp("siso", buf, 4)) {
3947                 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3948         } else if (!strncmp("stbc", buf, 4)) {
3949                 if (lq_sta->stbc_capable) {
3950                         lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3951                 } else {
3952                         IWL_ERR(mvm,
3953                                 "can't force STBC. peer doesn't support\n");
3954                         ret = -EINVAL;
3955                 }
3956         } else if (!strncmp("bfer", buf, 4)) {
3957                 if (lq_sta->bfer_capable) {
3958                         lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3959                 } else {
3960                         IWL_ERR(mvm,
3961                                 "can't force BFER. peer doesn't support\n");
3962                         ret = -EINVAL;
3963                 }
3964         } else {
3965                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3966                 ret = -EINVAL;
3967         }
3968         return ret ?: count;
3969 }
3970
3971 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3972         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3973 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
3974                 if (!debugfs_create_file(#name, mode, parent, lq_sta,   \
3975                                          &iwl_dbgfs_##name##_ops))      \
3976                         goto err;                                       \
3977         } while (0)
3978
3979 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3980
3981 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
3982 {
3983         struct iwl_lq_sta *lq_sta = priv_sta;
3984         struct iwl_mvm_sta *mvmsta;
3985
3986         mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3987
3988         if (!mvmsta->vif)
3989                 return;
3990
3991         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3992                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
3993         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3994                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
3995         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3996                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3997         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3998                           &lq_sta->tx_agg_tid_en);
3999         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
4000                           &lq_sta->pers.dbg_fixed_txp_reduction);
4001
4002         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
4003         return;
4004 err:
4005         IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
4006 }
4007
4008 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
4009 {
4010 }
4011 #endif
4012
4013 /*
4014  * Initialization of rate scaling information is done by driver after
4015  * the station is added. Since mac80211 calls this function before a
4016  * station is added we ignore it.
4017  */
4018 static void rs_rate_init_stub(void *mvm_r,
4019                               struct ieee80211_supported_band *sband,
4020                               struct cfg80211_chan_def *chandef,
4021                               struct ieee80211_sta *sta, void *mvm_sta)
4022 {
4023 }
4024
4025 static const struct rate_control_ops rs_mvm_ops = {
4026         .name = RS_NAME,
4027         .tx_status = rs_mac80211_tx_status,
4028         .get_rate = rs_get_rate,
4029         .rate_init = rs_rate_init_stub,
4030         .alloc = rs_alloc,
4031         .free = rs_free,
4032         .alloc_sta = rs_alloc_sta,
4033         .free_sta = rs_free_sta,
4034         .rate_update = rs_rate_update,
4035 #ifdef CONFIG_MAC80211_DEBUGFS
4036         .add_sta_debugfs = rs_add_debugfs,
4037         .remove_sta_debugfs = rs_remove_debugfs,
4038 #endif
4039 };
4040
4041 int iwl_mvm_rate_control_register(void)
4042 {
4043         return ieee80211_rate_control_register(&rs_mvm_ops);
4044 }
4045
4046 void iwl_mvm_rate_control_unregister(void)
4047 {
4048         ieee80211_rate_control_unregister(&rs_mvm_ops);
4049 }
4050
4051 /**
4052  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
4053  * Tx protection, according to this request and previous requests,
4054  * and send the LQ command.
4055  * @mvmsta: The station
4056  * @enable: Enable Tx protection?
4057  */
4058 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4059                           bool enable)
4060 {
4061         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
4062
4063         lockdep_assert_held(&mvm->mutex);
4064
4065         if (enable) {
4066                 if (mvmsta->tx_protection == 0)
4067                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
4068                 mvmsta->tx_protection++;
4069         } else {
4070                 mvmsta->tx_protection--;
4071                 if (mvmsta->tx_protection == 0)
4072                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4073         }
4074
4075         return iwl_mvm_send_lq_cmd(mvm, lq, false);
4076 }