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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
   4  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
   5  * Copyright(c) 2016 Intel Deutschland GmbH
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  * The full GNU General Public License is included in this distribution in the
  21  * file called LICENSE.
  22  *
  23  * Contact Information:
  24  *  Intel Linux Wireless <linuxwifi@intel.com>
  25  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26  *
  27  *****************************************************************************/
  28 #include <linux/kernel.h>
  29 #include <linux/skbuff.h>
  30 #include <linux/slab.h>
  31 #include <net/mac80211.h>
  32
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/delay.h>
  36
  37 #include <linux/workqueue.h>
  38 #include "rs.h"
  39 #include "fw-api.h"
  40 #include "sta.h"
  41 #include "iwl-op-mode.h"
  42 #include "mvm.h"
  43 #include "debugfs.h"
  44
  45 #define RS_NAME "iwl-mvm-rs"
  46
  47 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  48
  49 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
  50  * Use this macro when dealing with thresholds consts set as a percentage
  51  */
  52 #define RS_PERCENT(x) (128 * x)
  53
  54 static u8 rs_ht_to_legacy[] = {
  55         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  56         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  57         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  58         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  59         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  60         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  61         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  62         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  63         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  64         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  65 };
  66
  67 static const u8 ant_toggle_lookup[] = {
  68         [ANT_NONE] = ANT_NONE,
  69         [ANT_A] = ANT_B,
  70         [ANT_B] = ANT_C,
  71         [ANT_AB] = ANT_BC,
  72         [ANT_C] = ANT_A,
  73         [ANT_AC] = ANT_AB,
  74         [ANT_BC] = ANT_AC,
  75         [ANT_ABC] = ANT_ABC,
  76 };
  77
  78 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  79         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  80                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  81                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  82                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  83                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  84                                     IWL_RATE_##rp##M_INDEX,           \
  85                                     IWL_RATE_##rn##M_INDEX }
  86
  87 #define IWL_DECLARE_MCS_RATE(s)                                           \
  88         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
  89                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
  90                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
  91                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
  92                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
  93                                        IWL_RATE_INVM_INDEX,               \
  94                                        IWL_RATE_INVM_INDEX }
  95
  96 /*
  97  * Parameter order:
  98  *   rate, ht rate, prev rate, next rate
  99  *
 100  * If there isn't a valid next or previous rate then INV is used which
 101  * maps to IWL_RATE_INVALID
 102  *
 103  */
 104 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 105         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 106         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 107         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 108         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 109         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 110         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 111         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 112         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 113         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 114         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 115         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 116         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 117         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 118         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 119         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 120 };
 121
 122 enum rs_action {
 123         RS_ACTION_STAY = 0,
 124         RS_ACTION_DOWNSCALE = -1,
 125         RS_ACTION_UPSCALE = 1,
 126 };
 127
 128 enum rs_column_mode {
 129         RS_INVALID = 0,
 130         RS_LEGACY,
 131         RS_SISO,
 132         RS_MIMO2,
 133 };
 134
 135 #define MAX_NEXT_COLUMNS 7
 136 #define MAX_COLUMN_CHECKS 3
 137
 138 struct rs_tx_column;
 139
 140 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 141                                      struct ieee80211_sta *sta,
 142                                      struct rs_rate *rate,
 143                                      const struct rs_tx_column *next_col);
 144
 145 struct rs_tx_column {
 146         enum rs_column_mode mode;
 147         u8 ant;
 148         bool sgi;
 149         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 150         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 151 };
 152
 153 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 154                          struct rs_rate *rate,
 155                          const struct rs_tx_column *next_col)
 156 {
 157         return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
 158 }
 159
 160 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 161                           struct rs_rate *rate,
 162                           const struct rs_tx_column *next_col)
 163 {
 164         struct iwl_mvm_sta *mvmsta;
 165         struct iwl_mvm_vif *mvmvif;
 166
 167         if (!sta->ht_cap.ht_supported)
 168                 return false;
 169
 170         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 171                 return false;
 172
 173         if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
 174                 return false;
 175
 176         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 177                 return false;
 178
 179         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 180         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 181
 182         if (mvm->nvm_data->sku_cap_mimo_disabled)
 183                 return false;
 184
 185         return true;
 186 }
 187
 188 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 189                           struct rs_rate *rate,
 190                           const struct rs_tx_column *next_col)
 191 {
 192         if (!sta->ht_cap.ht_supported)
 193                 return false;
 194
 195         return true;
 196 }
 197
 198 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 199                          struct rs_rate *rate,
 200                          const struct rs_tx_column *next_col)
 201 {
 202         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 203         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 204
 205         if (is_ht20(rate) && (ht_cap->cap &
 206                              IEEE80211_HT_CAP_SGI_20))
 207                 return true;
 208         if (is_ht40(rate) && (ht_cap->cap &
 209                              IEEE80211_HT_CAP_SGI_40))
 210                 return true;
 211         if (is_ht80(rate) && (vht_cap->cap &
 212                              IEEE80211_VHT_CAP_SHORT_GI_80))
 213                 return true;
 214
 215         return false;
 216 }
 217
 218 static const struct rs_tx_column rs_tx_columns[] = {
 219         [RS_COLUMN_LEGACY_ANT_A] = {
 220                 .mode = RS_LEGACY,
 221                 .ant = ANT_A,
 222                 .next_columns = {
 223                         RS_COLUMN_LEGACY_ANT_B,
 224                         RS_COLUMN_SISO_ANT_A,
 225                         RS_COLUMN_MIMO2,
 226                         RS_COLUMN_INVALID,
 227                         RS_COLUMN_INVALID,
 228                         RS_COLUMN_INVALID,
 229                         RS_COLUMN_INVALID,
 230                 },
 231                 .checks = {
 232                         rs_ant_allow,
 233                 },
 234         },
 235         [RS_COLUMN_LEGACY_ANT_B] = {
 236                 .mode = RS_LEGACY,
 237                 .ant = ANT_B,
 238                 .next_columns = {
 239                         RS_COLUMN_LEGACY_ANT_A,
 240                         RS_COLUMN_SISO_ANT_B,
 241                         RS_COLUMN_MIMO2,
 242                         RS_COLUMN_INVALID,
 243                         RS_COLUMN_INVALID,
 244                         RS_COLUMN_INVALID,
 245                         RS_COLUMN_INVALID,
 246                 },
 247                 .checks = {
 248                         rs_ant_allow,
 249                 },
 250         },
 251         [RS_COLUMN_SISO_ANT_A] = {
 252                 .mode = RS_SISO,
 253                 .ant = ANT_A,
 254                 .next_columns = {
 255                         RS_COLUMN_SISO_ANT_B,
 256                         RS_COLUMN_MIMO2,
 257                         RS_COLUMN_SISO_ANT_A_SGI,
 258                         RS_COLUMN_LEGACY_ANT_A,
 259                         RS_COLUMN_LEGACY_ANT_B,
 260                         RS_COLUMN_INVALID,
 261                         RS_COLUMN_INVALID,
 262                 },
 263                 .checks = {
 264                         rs_siso_allow,
 265                         rs_ant_allow,
 266                 },
 267         },
 268         [RS_COLUMN_SISO_ANT_B] = {
 269                 .mode = RS_SISO,
 270                 .ant = ANT_B,
 271                 .next_columns = {
 272                         RS_COLUMN_SISO_ANT_A,
 273                         RS_COLUMN_MIMO2,
 274                         RS_COLUMN_SISO_ANT_B_SGI,
 275                         RS_COLUMN_LEGACY_ANT_A,
 276                         RS_COLUMN_LEGACY_ANT_B,
 277                         RS_COLUMN_INVALID,
 278                         RS_COLUMN_INVALID,
 279                 },
 280                 .checks = {
 281                         rs_siso_allow,
 282                         rs_ant_allow,
 283                 },
 284         },
 285         [RS_COLUMN_SISO_ANT_A_SGI] = {
 286                 .mode = RS_SISO,
 287                 .ant = ANT_A,
 288                 .sgi = true,
 289                 .next_columns = {
 290                         RS_COLUMN_SISO_ANT_B_SGI,
 291                         RS_COLUMN_MIMO2_SGI,
 292                         RS_COLUMN_SISO_ANT_A,
 293                         RS_COLUMN_LEGACY_ANT_A,
 294                         RS_COLUMN_LEGACY_ANT_B,
 295                         RS_COLUMN_INVALID,
 296                         RS_COLUMN_INVALID,
 297                 },
 298                 .checks = {
 299                         rs_siso_allow,
 300                         rs_ant_allow,
 301                         rs_sgi_allow,
 302                 },
 303         },
 304         [RS_COLUMN_SISO_ANT_B_SGI] = {
 305                 .mode = RS_SISO,
 306                 .ant = ANT_B,
 307                 .sgi = true,
 308                 .next_columns = {
 309                         RS_COLUMN_SISO_ANT_A_SGI,
 310                         RS_COLUMN_MIMO2_SGI,
 311                         RS_COLUMN_SISO_ANT_B,
 312                         RS_COLUMN_LEGACY_ANT_A,
 313                         RS_COLUMN_LEGACY_ANT_B,
 314                         RS_COLUMN_INVALID,
 315                         RS_COLUMN_INVALID,
 316                 },
 317                 .checks = {
 318                         rs_siso_allow,
 319                         rs_ant_allow,
 320                         rs_sgi_allow,
 321                 },
 322         },
 323         [RS_COLUMN_MIMO2] = {
 324                 .mode = RS_MIMO2,
 325                 .ant = ANT_AB,
 326                 .next_columns = {
 327                         RS_COLUMN_SISO_ANT_A,
 328                         RS_COLUMN_MIMO2_SGI,
 329                         RS_COLUMN_LEGACY_ANT_A,
 330                         RS_COLUMN_LEGACY_ANT_B,
 331                         RS_COLUMN_INVALID,
 332                         RS_COLUMN_INVALID,
 333                         RS_COLUMN_INVALID,
 334                 },
 335                 .checks = {
 336                         rs_mimo_allow,
 337                 },
 338         },
 339         [RS_COLUMN_MIMO2_SGI] = {
 340                 .mode = RS_MIMO2,
 341                 .ant = ANT_AB,
 342                 .sgi = true,
 343                 .next_columns = {
 344                         RS_COLUMN_SISO_ANT_A_SGI,
 345                         RS_COLUMN_MIMO2,
 346                         RS_COLUMN_LEGACY_ANT_A,
 347                         RS_COLUMN_LEGACY_ANT_B,
 348                         RS_COLUMN_INVALID,
 349                         RS_COLUMN_INVALID,
 350                         RS_COLUMN_INVALID,
 351                 },
 352                 .checks = {
 353                         rs_mimo_allow,
 354                         rs_sgi_allow,
 355                 },
 356         },
 357 };
 358
 359 static inline u8 rs_extract_rate(u32 rate_n_flags)
 360 {
 361         /* also works for HT because bits 7:6 are zero there */
 362         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 363 }
 364
 365 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 366 {
 367         int idx = 0;
 368
 369         if (rate_n_flags & RATE_MCS_HT_MSK) {
 370                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 371                 idx += IWL_RATE_MCS_0_INDEX;
 372
 373                 /* skip 9M not supported in HT*/
 374                 if (idx >= IWL_RATE_9M_INDEX)
 375                         idx += 1;
 376                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 377                         return idx;
 378         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 379                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 380                 idx += IWL_RATE_MCS_0_INDEX;
 381
 382                 /* skip 9M not supported in VHT*/
 383                 if (idx >= IWL_RATE_9M_INDEX)
 384                         idx++;
 385                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 386                         return idx;
 387         } else {
 388                 /* legacy rate format, search for match in table */
 389
 390                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 391                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 392                         if (iwl_rates[idx].plcp == legacy_rate)
 393                                 return idx;
 394         }
 395
 396         return IWL_RATE_INVALID;
 397 }
 398
 399 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 400                                   struct ieee80211_sta *sta,
 401                                   struct iwl_lq_sta *lq_sta,
 402                                   int tid);
 403 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 404                            struct ieee80211_sta *sta,
 405                            struct iwl_lq_sta *lq_sta,
 406                            const struct rs_rate *initial_rate);
 407 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 408
 409 /**
 410  * The following tables contain the expected throughput metrics for all rates
 411  *
 412  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 413  *
 414  * where invalid entries are zeros.
 415  *
 416  * CCK rates are only valid in legacy table and will only be used in G
 417  * (2.4 GHz) band.
 418  */
 419
 420 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 421         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 422 };
 423
 424 /* Expected TpT tables. 4 indexes:
 425  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 426  */
 427 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 428         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 429         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 430         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 431         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 432 };
 433
 434 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 435         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 436         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 437         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 438         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 439 };
 440
 441 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 442         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 443         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 444         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 445         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 446 };
 447
 448 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 449         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 450         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 451         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 452         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 453 };
 454
 455 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 456         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 457         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 458         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 459         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 460 };
 461
 462 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 463         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 464         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 465         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 466         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 467 };
 468
 469 /* mbps, mcs */
 470 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 471         {  "1", "BPSK DSSS"},
 472         {  "2", "QPSK DSSS"},
 473         {"5.5", "BPSK CCK"},
 474         { "11", "QPSK CCK"},
 475         {  "6", "BPSK 1/2"},
 476         {  "9", "BPSK 1/2"},
 477         { "12", "QPSK 1/2"},
 478         { "18", "QPSK 3/4"},
 479         { "24", "16QAM 1/2"},
 480         { "36", "16QAM 3/4"},
 481         { "48", "64QAM 2/3"},
 482         { "54", "64QAM 3/4"},
 483         { "60", "64QAM 5/6"},
 484 };
 485
 486 #define MCS_INDEX_PER_STREAM    (8)
 487
 488 static const char *rs_pretty_ant(u8 ant)
 489 {
 490         static const char * const ant_name[] = {
 491                 [ANT_NONE] = "None",
 492                 [ANT_A]    = "A",
 493                 [ANT_B]    = "B",
 494                 [ANT_AB]   = "AB",
 495                 [ANT_C]    = "C",
 496                 [ANT_AC]   = "AC",
 497                 [ANT_BC]   = "BC",
 498                 [ANT_ABC]  = "ABC",
 499         };
 500
 501         if (ant > ANT_ABC)
 502                 return "UNKNOWN";
 503
 504         return ant_name[ant];
 505 }
 506
 507 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 508 {
 509         static const char * const lq_types[] = {
 510                 [LQ_NONE] = "NONE",
 511                 [LQ_LEGACY_A] = "LEGACY_A",
 512                 [LQ_LEGACY_G] = "LEGACY_G",
 513                 [LQ_HT_SISO] = "HT SISO",
 514                 [LQ_HT_MIMO2] = "HT MIMO",
 515                 [LQ_VHT_SISO] = "VHT SISO",
 516                 [LQ_VHT_MIMO2] = "VHT MIMO",
 517         };
 518
 519         if (type < LQ_NONE || type >= LQ_MAX)
 520                 return "UNKNOWN";
 521
 522         return lq_types[type];
 523 }
 524
 525 static char *rs_pretty_rate(const struct rs_rate *rate)
 526 {
 527         static char buf[40];
 528         static const char * const legacy_rates[] = {
 529                 [IWL_RATE_1M_INDEX] = "1M",
 530                 [IWL_RATE_2M_INDEX] = "2M",
 531                 [IWL_RATE_5M_INDEX] = "5.5M",
 532                 [IWL_RATE_11M_INDEX] = "11M",
 533                 [IWL_RATE_6M_INDEX] = "6M",
 534                 [IWL_RATE_9M_INDEX] = "9M",
 535                 [IWL_RATE_12M_INDEX] = "12M",
 536                 [IWL_RATE_18M_INDEX] = "18M",
 537                 [IWL_RATE_24M_INDEX] = "24M",
 538                 [IWL_RATE_36M_INDEX] = "36M",
 539                 [IWL_RATE_48M_INDEX] = "48M",
 540                 [IWL_RATE_54M_INDEX] = "54M",
 541         };
 542         static const char *const ht_vht_rates[] = {
 543                 [IWL_RATE_MCS_0_INDEX] = "MCS0",
 544                 [IWL_RATE_MCS_1_INDEX] = "MCS1",
 545                 [IWL_RATE_MCS_2_INDEX] = "MCS2",
 546                 [IWL_RATE_MCS_3_INDEX] = "MCS3",
 547                 [IWL_RATE_MCS_4_INDEX] = "MCS4",
 548                 [IWL_RATE_MCS_5_INDEX] = "MCS5",
 549                 [IWL_RATE_MCS_6_INDEX] = "MCS6",
 550                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
 551                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
 552                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
 553         };
 554         const char *rate_str;
 555
 556         if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
 557                 rate_str = legacy_rates[rate->index];
 558         else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
 559                  (rate->index <= IWL_RATE_MCS_9_INDEX))
 560                 rate_str = ht_vht_rates[rate->index];
 561         else
 562                 rate_str = "BAD_RATE";
 563
 564         sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
 565                 rs_pretty_ant(rate->ant), rate_str);
 566         return buf;
 567 }
 568
 569 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 570                                 const char *prefix)
 571 {
 572         IWL_DEBUG_RATE(mvm,
 573                        "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
 574                        prefix, rs_pretty_rate(rate), rate->bw,
 575                        rate->sgi, rate->ldpc, rate->stbc);
 576 }
 577
 578 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 579 {
 580         window->data = 0;
 581         window->success_counter = 0;
 582         window->success_ratio = IWL_INVALID_VALUE;
 583         window->counter = 0;
 584         window->average_tpt = IWL_INVALID_VALUE;
 585 }
 586
 587 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 588                                             struct iwl_scale_tbl_info *tbl)
 589 {
 590         int i;
 591
 592         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 593         for (i = 0; i < IWL_RATE_COUNT; i++)
 594                 rs_rate_scale_clear_window(&tbl->win[i]);
 595
 596         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 597                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 598 }
 599
 600 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 601 {
 602         return (ant_type & valid_antenna) == ant_type;
 603 }
 604
 605 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 606                                      struct iwl_lq_sta *lq_data, u8 tid,
 607                                      struct ieee80211_sta *sta)
 608 {
 609         int ret = -EAGAIN;
 610
 611         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 612                      sta->addr, tid);
 613         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 614         if (ret == -EAGAIN) {
 615                 /*
 616                  * driver and mac80211 is out of sync
 617                  * this might be cause by reloading firmware
 618                  * stop the tx ba session here
 619                  */
 620                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 621                         tid);
 622                 ieee80211_stop_tx_ba_session(sta, tid);
 623         }
 624         return ret;
 625 }
 626
 627 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 628                               struct iwl_lq_sta *lq_data,
 629                               struct ieee80211_sta *sta)
 630 {
 631         if (tid < IWL_MAX_TID_COUNT)
 632                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 633         else
 634                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 635                         tid, IWL_MAX_TID_COUNT);
 636 }
 637
 638 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 639 {
 640         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 641                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 642                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 643 }
 644
 645 /*
 646  * Static function to get the expected throughput from an iwl_scale_tbl_info
 647  * that wraps a NULL pointer check
 648  */
 649 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 650 {
 651         if (tbl->expected_tpt)
 652                 return tbl->expected_tpt[rs_index];
 653         return 0;
 654 }
 655
 656 /**
 657  * rs_collect_tx_data - Update the success/failure sliding window
 658  *
 659  * We keep a sliding window of the last 62 packets transmitted
 660  * at this rate.  window->data contains the bitmask of successful
 661  * packets.
 662  */
 663 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
 664                                struct iwl_scale_tbl_info *tbl,
 665                                int scale_index, int attempts, int successes,
 666                                struct iwl_rate_scale_data *window)
 667 {
 668         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 669         s32 fail_count, tpt;
 670
 671         /* Get expected throughput */
 672         tpt = get_expected_tpt(tbl, scale_index);
 673
 674         /*
 675          * Keep track of only the latest 62 tx frame attempts in this rate's
 676          * history window; anything older isn't really relevant any more.
 677          * If we have filled up the sliding window, drop the oldest attempt;
 678          * if the oldest attempt (highest bit in bitmap) shows "success",
 679          * subtract "1" from the success counter (this is the main reason
 680          * we keep these bitmaps!).
 681          */
 682         while (attempts > 0) {
 683                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 684                         /* remove earliest */
 685                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 686
 687                         if (window->data & mask) {
 688                                 window->data &= ~mask;
 689                                 window->success_counter--;
 690                         }
 691                 }
 692
 693                 /* Increment frames-attempted counter */
 694                 window->counter++;
 695
 696                 /* Shift bitmap by one frame to throw away oldest history */
 697                 window->data <<= 1;
 698
 699                 /* Mark the most recent #successes attempts as successful */
 700                 if (successes > 0) {
 701                         window->success_counter++;
 702                         window->data |= 0x1;
 703                         successes--;
 704                 }
 705
 706                 attempts--;
 707         }
 708
 709         /* Calculate current success ratio, avoid divide-by-0! */
 710         if (window->counter > 0)
 711                 window->success_ratio = 128 * (100 * window->success_counter)
 712                                         / window->counter;
 713         else
 714                 window->success_ratio = IWL_INVALID_VALUE;
 715
 716         fail_count = window->counter - window->success_counter;
 717
 718         /* Calculate average throughput, if we have enough history. */
 719         if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
 720             (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
 721                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 722         else
 723                 window->average_tpt = IWL_INVALID_VALUE;
 724
 725         return 0;
 726 }
 727
 728 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
 729                                struct iwl_lq_sta *lq_sta,
 730                                struct iwl_scale_tbl_info *tbl,
 731                                int scale_index, int attempts, int successes,
 732                                u8 reduced_txp)
 733 {
 734         struct iwl_rate_scale_data *window = NULL;
 735
 736         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 737                 return -EINVAL;
 738
 739         window = &tbl->tpc_win[reduced_txp];
 740         return  _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 741                                     window);
 742 }
 743
 744 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
 745                                struct iwl_lq_sta *lq_sta,
 746                                struct iwl_scale_tbl_info *tbl,
 747                                int scale_index, int attempts, int successes)
 748 {
 749         struct iwl_rate_scale_data *window = NULL;
 750
 751         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 752                 return -EINVAL;
 753
 754         if (tbl->column != RS_COLUMN_INVALID) {
 755                 struct lq_sta_pers *pers = &lq_sta->pers;
 756
 757                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 758                 pers->tx_stats[tbl->column][scale_index].success += successes;
 759         }
 760
 761         /* Select window for current tx bit rate */
 762         window = &(tbl->win[scale_index]);
 763         return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 764                                    window);
 765 }
 766
 767 /* Convert rs_rate object into ucode rate bitmask */
 768 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 769                                   struct rs_rate *rate)
 770 {
 771         u32 ucode_rate = 0;
 772         int index = rate->index;
 773
 774         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 775                          RATE_MCS_ANT_ABC_MSK);
 776
 777         if (is_legacy(rate)) {
 778                 ucode_rate |= iwl_rates[index].plcp;
 779                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 780                         ucode_rate |= RATE_MCS_CCK_MSK;
 781                 return ucode_rate;
 782         }
 783
 784         if (is_ht(rate)) {
 785                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 786                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 787                         index = IWL_LAST_HT_RATE;
 788                 }
 789                 ucode_rate |= RATE_MCS_HT_MSK;
 790
 791                 if (is_ht_siso(rate))
 792                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 793                 else if (is_ht_mimo2(rate))
 794                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 795                 else
 796                         WARN_ON_ONCE(1);
 797         } else if (is_vht(rate)) {
 798                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 799                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 800                         index = IWL_LAST_VHT_RATE;
 801                 }
 802                 ucode_rate |= RATE_MCS_VHT_MSK;
 803                 if (is_vht_siso(rate))
 804                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 805                 else if (is_vht_mimo2(rate))
 806                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 807                 else
 808                         WARN_ON_ONCE(1);
 809
 810         } else {
 811                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 812         }
 813
 814         if (is_siso(rate) && rate->stbc) {
 815                 /* To enable STBC we need to set both a flag and ANT_AB */
 816                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 817                 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
 818         }
 819
 820         ucode_rate |= rate->bw;
 821         if (rate->sgi)
 822                 ucode_rate |= RATE_MCS_SGI_MSK;
 823         if (rate->ldpc)
 824                 ucode_rate |= RATE_MCS_LDPC_MSK;
 825
 826         return ucode_rate;
 827 }
 828
 829 /* Convert a ucode rate into an rs_rate object */
 830 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 831                                    enum ieee80211_band band,
 832                                    struct rs_rate *rate)
 833 {
 834         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 835         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 836         u8 nss;
 837
 838         memset(rate, 0, sizeof(*rate));
 839         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 840
 841         if (rate->index == IWL_RATE_INVALID)
 842                 return -EINVAL;
 843
 844         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 845
 846         /* Legacy */
 847         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 848             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 849                 if (num_of_ant == 1) {
 850                         if (band == IEEE80211_BAND_5GHZ)
 851                                 rate->type = LQ_LEGACY_A;
 852                         else
 853                                 rate->type = LQ_LEGACY_G;
 854                 }
 855
 856                 return 0;
 857         }
 858
 859         /* HT or VHT */
 860         if (ucode_rate & RATE_MCS_SGI_MSK)
 861                 rate->sgi = true;
 862         if (ucode_rate & RATE_MCS_LDPC_MSK)
 863                 rate->ldpc = true;
 864         if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
 865                 rate->stbc = true;
 866         if (ucode_rate & RATE_MCS_BF_MSK)
 867                 rate->bfer = true;
 868
 869         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 870
 871         if (ucode_rate & RATE_MCS_HT_MSK) {
 872                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 873                        RATE_HT_MCS_NSS_POS) + 1;
 874
 875                 if (nss == 1) {
 876                         rate->type = LQ_HT_SISO;
 877                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 878                                   "stbc %d bfer %d",
 879                                   rate->stbc, rate->bfer);
 880                 } else if (nss == 2) {
 881                         rate->type = LQ_HT_MIMO2;
 882                         WARN_ON_ONCE(num_of_ant != 2);
 883                 } else {
 884                         WARN_ON_ONCE(1);
 885                 }
 886         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 887                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 888                        RATE_VHT_MCS_NSS_POS) + 1;
 889
 890                 if (nss == 1) {
 891                         rate->type = LQ_VHT_SISO;
 892                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 893                                   "stbc %d bfer %d",
 894                                   rate->stbc, rate->bfer);
 895                 } else if (nss == 2) {
 896                         rate->type = LQ_VHT_MIMO2;
 897                         WARN_ON_ONCE(num_of_ant != 2);
 898                 } else {
 899                         WARN_ON_ONCE(1);
 900                 }
 901         }
 902
 903         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
 904         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 905                      !is_vht(rate));
 906
 907         return 0;
 908 }
 909
 910 /* switch to another antenna/antennas and return 1 */
 911 /* if no other valid antenna found, return 0 */
 912 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 913 {
 914         u8 new_ant_type;
 915
 916         if (!rate->ant || rate->ant > ANT_ABC)
 917                 return 0;
 918
 919         if (!rs_is_valid_ant(valid_ant, rate->ant))
 920                 return 0;
 921
 922         new_ant_type = ant_toggle_lookup[rate->ant];
 923
 924         while ((new_ant_type != rate->ant) &&
 925                !rs_is_valid_ant(valid_ant, new_ant_type))
 926                 new_ant_type = ant_toggle_lookup[new_ant_type];
 927
 928         if (new_ant_type == rate->ant)
 929                 return 0;
 930
 931         rate->ant = new_ant_type;
 932
 933         return 1;
 934 }
 935
 936 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 937                                   struct rs_rate *rate)
 938 {
 939         if (is_legacy(rate))
 940                 return lq_sta->active_legacy_rate;
 941         else if (is_siso(rate))
 942                 return lq_sta->active_siso_rate;
 943         else if (is_mimo2(rate))
 944                 return lq_sta->active_mimo2_rate;
 945
 946         WARN_ON_ONCE(1);
 947         return 0;
 948 }
 949
 950 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 951                                 int rate_type)
 952 {
 953         u8 high = IWL_RATE_INVALID;
 954         u8 low = IWL_RATE_INVALID;
 955
 956         /* 802.11A or ht walks to the next literal adjacent rate in
 957          * the rate table */
 958         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 959                 int i;
 960                 u32 mask;
 961
 962                 /* Find the previous rate that is in the rate mask */
 963                 i = index - 1;
 964                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 965                         if (rate_mask & mask) {
 966                                 low = i;
 967                                 break;
 968                         }
 969                 }
 970
 971                 /* Find the next rate that is in the rate mask */
 972                 i = index + 1;
 973                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 974                         if (rate_mask & mask) {
 975                                 high = i;
 976                                 break;
 977                         }
 978                 }
 979
 980                 return (high << 8) | low;
 981         }
 982
 983         low = index;
 984         while (low != IWL_RATE_INVALID) {
 985                 low = iwl_rates[low].prev_rs;
 986                 if (low == IWL_RATE_INVALID)
 987                         break;
 988                 if (rate_mask & (1 << low))
 989                         break;
 990         }
 991
 992         high = index;
 993         while (high != IWL_RATE_INVALID) {
 994                 high = iwl_rates[high].next_rs;
 995                 if (high == IWL_RATE_INVALID)
 996                         break;
 997                 if (rate_mask & (1 << high))
 998                         break;
 999         }
1000
1001         return (high << 8) | low;
1002 }
1003
1004 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1005                                      struct rs_rate *rate)
1006 {
1007         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1008 }
1009
1010 /* Get the next supported lower rate in the current column.
1011  * Return true if bottom rate in the current column was reached
1012  */
1013 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1014                                         struct rs_rate *rate)
1015 {
1016         u8 low;
1017         u16 high_low;
1018         u16 rate_mask;
1019         struct iwl_mvm *mvm = lq_sta->pers.drv;
1020
1021         rate_mask = rs_get_supported_rates(lq_sta, rate);
1022         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1023                                         rate->type);
1024         low = high_low & 0xff;
1025
1026         /* Bottom rate of column reached */
1027         if (low == IWL_RATE_INVALID)
1028                 return true;
1029
1030         rate->index = low;
1031         return false;
1032 }
1033
1034 /* Get the next rate to use following a column downgrade */
1035 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1036                                           struct rs_rate *rate)
1037 {
1038         struct iwl_mvm *mvm = lq_sta->pers.drv;
1039
1040         if (is_legacy(rate)) {
1041                 /* No column to downgrade from Legacy */
1042                 return;
1043         } else if (is_siso(rate)) {
1044                 /* Downgrade to Legacy if we were in SISO */
1045                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1046                         rate->type = LQ_LEGACY_A;
1047                 else
1048                         rate->type = LQ_LEGACY_G;
1049
1050                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1051
1052                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1053                              rate->index > IWL_RATE_MCS_9_INDEX);
1054
1055                 rate->index = rs_ht_to_legacy[rate->index];
1056                 rate->ldpc = false;
1057         } else {
1058                 /* Downgrade to SISO with same MCS if in MIMO  */
1059                 rate->type = is_vht_mimo2(rate) ?
1060                         LQ_VHT_SISO : LQ_HT_SISO;
1061         }
1062
1063         if (num_of_ant(rate->ant) > 1)
1064                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1065
1066         /* Relevant in both switching to SISO or Legacy */
1067         rate->sgi = false;
1068
1069         if (!rs_rate_supported(lq_sta, rate))
1070                 rs_get_lower_rate_in_column(lq_sta, rate);
1071 }
1072
1073 /* Check if both rates are identical
1074  * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1075  * with a rate indicating STBC/BFER and ANT_AB.
1076  */
1077 static inline bool rs_rate_equal(struct rs_rate *a,
1078                                  struct rs_rate *b,
1079                                  bool allow_ant_mismatch)
1080
1081 {
1082         bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1083                 (a->bfer == b->bfer);
1084
1085         if (allow_ant_mismatch) {
1086                 if (a->stbc || a->bfer) {
1087                         WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1088                                   a->stbc, a->bfer, a->ant);
1089                         ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1090                 } else if (b->stbc || b->bfer) {
1091                         WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1092                                   b->stbc, b->bfer, b->ant);
1093                         ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1094                 }
1095         }
1096
1097         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1098                 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1099 }
1100
1101 /* Check if both rates share the same column */
1102 static inline bool rs_rate_column_match(struct rs_rate *a,
1103                                         struct rs_rate *b)
1104 {
1105         bool ant_match;
1106
1107         if (a->stbc || a->bfer)
1108                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1109         else
1110                 ant_match = (a->ant == b->ant);
1111
1112         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1113                 && ant_match;
1114 }
1115
1116 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1117 {
1118         if (is_legacy(rate)) {
1119                 if (rate->ant == ANT_A)
1120                         return RS_COLUMN_LEGACY_ANT_A;
1121
1122                 if (rate->ant == ANT_B)
1123                         return RS_COLUMN_LEGACY_ANT_B;
1124
1125                 goto err;
1126         }
1127
1128         if (is_siso(rate)) {
1129                 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1130                         return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1131                                 RS_COLUMN_SISO_ANT_A;
1132
1133                 if (rate->ant == ANT_B)
1134                         return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1135                                 RS_COLUMN_SISO_ANT_B;
1136
1137                 goto err;
1138         }
1139
1140         if (is_mimo(rate))
1141                 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1142
1143 err:
1144         return RS_COLUMN_INVALID;
1145 }
1146
1147 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1148 {
1149         u8 tid = IWL_MAX_TID_COUNT;
1150
1151         if (ieee80211_is_data_qos(hdr->frame_control)) {
1152                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1153                 tid = qc[0] & 0xf;
1154         }
1155
1156         if (unlikely(tid > IWL_MAX_TID_COUNT))
1157                 tid = IWL_MAX_TID_COUNT;
1158
1159         return tid;
1160 }
1161
1162 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1163                           int tid, struct ieee80211_tx_info *info)
1164 {
1165         int legacy_success;
1166         int retries;
1167         int i;
1168         struct iwl_lq_cmd *table;
1169         u32 lq_hwrate;
1170         struct rs_rate lq_rate, tx_resp_rate;
1171         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1172         u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1173         u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1174         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1175         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1176         bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa,
1177                                              IWL_UCODE_TLV_API_LQ_SS_PARAMS);
1178
1179         /* Treat uninitialized rate scaling data same as non-existing. */
1180         if (!lq_sta) {
1181                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1182                 return;
1183         } else if (!lq_sta->pers.drv) {
1184                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1185                 return;
1186         }
1187
1188         /* This packet was aggregated but doesn't carry status info */
1189         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1190             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1191                 return;
1192
1193         rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1194
1195 #ifdef CONFIG_MAC80211_DEBUGFS
1196         /* Disable last tx check if we are debugging with fixed rate but
1197          * update tx stats */
1198         if (lq_sta->pers.dbg_fixed_rate) {
1199                 int index = tx_resp_rate.index;
1200                 enum rs_column column;
1201                 int attempts, success;
1202
1203                 column = rs_get_column_from_rate(&tx_resp_rate);
1204                 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1205                               "Can't map rate 0x%x to column",
1206                               tx_resp_hwrate))
1207                         return;
1208
1209                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1210                         attempts = info->status.ampdu_len;
1211                         success = info->status.ampdu_ack_len;
1212                 } else {
1213                         attempts = info->status.rates[0].count;
1214                         success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1215                 }
1216
1217                 lq_sta->pers.tx_stats[column][index].total += attempts;
1218                 lq_sta->pers.tx_stats[column][index].success += success;
1219
1220                 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1221                                tx_resp_hwrate, success, attempts);
1222                 return;
1223         }
1224 #endif
1225
1226         if (time_after(jiffies,
1227                        (unsigned long)(lq_sta->last_tx +
1228                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1229                 int t;
1230
1231                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1232                 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1233                         ieee80211_stop_tx_ba_session(sta, t);
1234
1235                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1236                 return;
1237         }
1238         lq_sta->last_tx = jiffies;
1239
1240         /* Ignore this Tx frame response if its initial rate doesn't match
1241          * that of latest Link Quality command.  There may be stragglers
1242          * from a previous Link Quality command, but we're no longer interested
1243          * in those; they're either from the "active" mode while we're trying
1244          * to check "search" mode, or a prior "search" mode after we've moved
1245          * to a new "search" mode (which might become the new "active" mode).
1246          */
1247         table = &lq_sta->lq;
1248         lq_hwrate = le32_to_cpu(table->rs_table[0]);
1249         rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1250
1251         /* Here we actually compare this rate to the latest LQ command */
1252         if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1253                 IWL_DEBUG_RATE(mvm,
1254                                "initial tx resp rate 0x%x does not match 0x%x\n",
1255                                tx_resp_hwrate, lq_hwrate);
1256
1257                 /*
1258                  * Since rates mis-match, the last LQ command may have failed.
1259                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1260                  * ... driver.
1261                  */
1262                 lq_sta->missed_rate_counter++;
1263                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1264                         lq_sta->missed_rate_counter = 0;
1265                         IWL_DEBUG_RATE(mvm,
1266                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1267                                        lq_sta->rs_state);
1268                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1269                 }
1270                 /* Regardless, ignore this status info for outdated rate */
1271                 return;
1272         } else
1273                 /* Rate did match, so reset the missed_rate_counter */
1274                 lq_sta->missed_rate_counter = 0;
1275
1276         if (!lq_sta->search_better_tbl) {
1277                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1278                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1279         } else {
1280                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1281                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1282         }
1283
1284         if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1285                 IWL_DEBUG_RATE(mvm,
1286                                "Neither active nor search matches tx rate\n");
1287                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1288                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1289                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1290                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1291                 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1292
1293                 /*
1294                  * no matching table found, let's by-pass the data collection
1295                  * and continue to perform rate scale to find the rate table
1296                  */
1297                 rs_stay_in_table(lq_sta, true);
1298                 goto done;
1299         }
1300
1301         /*
1302          * Updating the frame history depends on whether packets were
1303          * aggregated.
1304          *
1305          * For aggregation, all packets were transmitted at the same rate, the
1306          * first index into rate scale table.
1307          */
1308         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1309                 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1310                                     info->status.ampdu_len,
1311                                     info->status.ampdu_ack_len,
1312                                     reduced_txp);
1313
1314                 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1315                  * it as a single frame loss as we don't want the success ratio
1316                  * to dip too quickly because a BA wasn't received.
1317                  * For TPC, there's no need for this optimisation since we want
1318                  * to recover very quickly from a bad power reduction and,
1319                  * therefore we'd like the success ratio to get an immediate hit
1320                  * when failing to get a BA, so we'd switch back to a lower or
1321                  * zero power reduction. When FW transmits agg with a rate
1322                  * different from the initial rate, it will not use reduced txp
1323                  * and will send BA notification twice (one empty with reduced
1324                  * txp equal to the value from LQ and one with reduced txp 0).
1325                  * We need to update counters for each txp level accordingly.
1326                  */
1327                 if (info->status.ampdu_ack_len == 0)
1328                         info->status.ampdu_len = 1;
1329
1330                 rs_collect_tlc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1331                                     info->status.ampdu_len,
1332                                     info->status.ampdu_ack_len);
1333
1334                 /* Update success/fail counts if not searching for new mode */
1335                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1336                         lq_sta->total_success += info->status.ampdu_ack_len;
1337                         lq_sta->total_failed += (info->status.ampdu_len -
1338                                         info->status.ampdu_ack_len);
1339                 }
1340         } else {
1341                 /* For legacy, update frame history with for each Tx retry. */
1342                 retries = info->status.rates[0].count - 1;
1343                 /* HW doesn't send more than 15 retries */
1344                 retries = min(retries, 15);
1345
1346                 /* The last transmission may have been successful */
1347                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1348                 /* Collect data for each rate used during failed TX attempts */
1349                 for (i = 0; i <= retries; ++i) {
1350                         lq_hwrate = le32_to_cpu(table->rs_table[i]);
1351                         rs_rate_from_ucode_rate(lq_hwrate, info->band,
1352                                                 &lq_rate);
1353                         /*
1354                          * Only collect stats if retried rate is in the same RS
1355                          * table as active/search.
1356                          */
1357                         if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1358                                 tmp_tbl = curr_tbl;
1359                         else if (rs_rate_column_match(&lq_rate,
1360                                                       &other_tbl->rate))
1361                                 tmp_tbl = other_tbl;
1362                         else
1363                                 continue;
1364
1365                         rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1366                                             lq_rate.index, 1,
1367                                             i < retries ? 0 : legacy_success,
1368                                             reduced_txp);
1369                         rs_collect_tlc_data(mvm, lq_sta, tmp_tbl,
1370                                             lq_rate.index, 1,
1371                                             i < retries ? 0 : legacy_success);
1372                 }
1373
1374                 /* Update success/fail counts if not searching for new mode */
1375                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1376                         lq_sta->total_success += legacy_success;
1377                         lq_sta->total_failed += retries + (1 - legacy_success);
1378                 }
1379         }
1380         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1381         lq_sta->last_rate_n_flags = lq_hwrate;
1382         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1383 done:
1384         /* See if there's a better rate or modulation mode to try. */
1385         if (sta->supp_rates[info->band])
1386                 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1387 }
1388
1389 /*
1390  * mac80211 sends us Tx status
1391  */
1392 static void rs_mac80211_tx_status(void *mvm_r,
1393                                   struct ieee80211_supported_band *sband,
1394                                   struct ieee80211_sta *sta, void *priv_sta,
1395                                   struct sk_buff *skb)
1396 {
1397         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1398         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1399         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1400         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1401
1402         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1403                 return;
1404
1405         if (!ieee80211_is_data(hdr->frame_control) ||
1406             info->flags & IEEE80211_TX_CTL_NO_ACK)
1407                 return;
1408
1409         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1410 }
1411
1412 /*
1413  * Begin a period of staying with a selected modulation mode.
1414  * Set "stay_in_tbl" flag to prevent any mode switches.
1415  * Set frame tx success limits according to legacy vs. high-throughput,
1416  * and reset overall (spanning all rates) tx success history statistics.
1417  * These control how long we stay using same modulation mode before
1418  * searching for a new mode.
1419  */
1420 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1421                                  struct iwl_lq_sta *lq_sta)
1422 {
1423         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1424         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1425         if (is_legacy) {
1426                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1427                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1428                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1429         } else {
1430                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1431                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1432                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1433         }
1434         lq_sta->table_count = 0;
1435         lq_sta->total_failed = 0;
1436         lq_sta->total_success = 0;
1437         lq_sta->flush_timer = jiffies;
1438         lq_sta->visited_columns = 0;
1439 }
1440
1441 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1442 {
1443         if (rate_mask)
1444                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1445         return IWL_RATE_INVALID;
1446 }
1447
1448 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1449                                    const struct rs_tx_column *column)
1450 {
1451         switch (column->mode) {
1452         case RS_LEGACY:
1453                 return lq_sta->max_legacy_rate_idx;
1454         case RS_SISO:
1455                 return lq_sta->max_siso_rate_idx;
1456         case RS_MIMO2:
1457                 return lq_sta->max_mimo2_rate_idx;
1458         default:
1459                 WARN_ON_ONCE(1);
1460         }
1461
1462         return lq_sta->max_legacy_rate_idx;
1463 }
1464
1465 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1466                                             const struct rs_tx_column *column,
1467                                             u32 bw)
1468 {
1469         /* Used to choose among HT tables */
1470         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1471
1472         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1473                          column->mode != RS_SISO &&
1474                          column->mode != RS_MIMO2))
1475                 return expected_tpt_legacy;
1476
1477         /* Legacy rates have only one table */
1478         if (column->mode == RS_LEGACY)
1479                 return expected_tpt_legacy;
1480
1481         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1482         /* Choose among many HT tables depending on number of streams
1483          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1484          * status */
1485         if (column->mode == RS_SISO) {
1486                 switch (bw) {
1487                 case RATE_MCS_CHAN_WIDTH_20:
1488                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1489                         break;
1490                 case RATE_MCS_CHAN_WIDTH_40:
1491                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1492                         break;
1493                 case RATE_MCS_CHAN_WIDTH_80:
1494                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1495                         break;
1496                 default:
1497                         WARN_ON_ONCE(1);
1498                 }
1499         } else if (column->mode == RS_MIMO2) {
1500                 switch (bw) {
1501                 case RATE_MCS_CHAN_WIDTH_20:
1502                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1503                         break;
1504                 case RATE_MCS_CHAN_WIDTH_40:
1505                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1506                         break;
1507                 case RATE_MCS_CHAN_WIDTH_80:
1508                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1509                         break;
1510                 default:
1511                         WARN_ON_ONCE(1);
1512                 }
1513         } else {
1514                 WARN_ON_ONCE(1);
1515         }
1516
1517         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1518                 return ht_tbl_pointer[0];
1519         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1520                 return ht_tbl_pointer[1];
1521         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1522                 return ht_tbl_pointer[2];
1523         else                                            /* AGG+SGI */
1524                 return ht_tbl_pointer[3];
1525 }
1526
1527 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1528                                       struct iwl_scale_tbl_info *tbl)
1529 {
1530         struct rs_rate *rate = &tbl->rate;
1531         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1532
1533         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1534 }
1535
1536 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1537                             struct iwl_lq_sta *lq_sta,
1538                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1539                             unsigned long rate_mask, s8 index)
1540 {
1541         struct iwl_scale_tbl_info *active_tbl =
1542             &(lq_sta->lq_info[lq_sta->active_tbl]);
1543         s32 success_ratio = active_tbl->win[index].success_ratio;
1544         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1545         const u16 *tpt_tbl = tbl->expected_tpt;
1546         u16 high_low;
1547         u32 target_tpt;
1548         int rate_idx;
1549
1550         if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1551                 target_tpt = 100 * expected_current_tpt;
1552                 IWL_DEBUG_RATE(mvm,
1553                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1554                                success_ratio, target_tpt);
1555         } else {
1556                 target_tpt = lq_sta->last_tpt;
1557                 IWL_DEBUG_RATE(mvm,
1558                                "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1559                                success_ratio, target_tpt);
1560         }
1561
1562         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1563
1564         while (rate_idx != IWL_RATE_INVALID) {
1565                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1566                         break;
1567
1568                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1569                                                 tbl->rate.type);
1570
1571                 rate_idx = (high_low >> 8) & 0xff;
1572         }
1573
1574         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1575                        rate_idx, target_tpt,
1576                        rate_idx != IWL_RATE_INVALID ?
1577                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1578
1579         return rate_idx;
1580 }
1581
1582 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1583 {
1584         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1585                 return RATE_MCS_CHAN_WIDTH_80;
1586         else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1587                 return RATE_MCS_CHAN_WIDTH_40;
1588
1589         return RATE_MCS_CHAN_WIDTH_20;
1590 }
1591
1592 /*
1593  * Check whether we should continue using same modulation mode, or
1594  * begin search for a new mode, based on:
1595  * 1) # tx successes or failures while using this mode
1596  * 2) # times calling this function
1597  * 3) elapsed time in this mode (not used, for now)
1598  */
1599 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1600 {
1601         struct iwl_scale_tbl_info *tbl;
1602         int active_tbl;
1603         int flush_interval_passed = 0;
1604         struct iwl_mvm *mvm;
1605
1606         mvm = lq_sta->pers.drv;
1607         active_tbl = lq_sta->active_tbl;
1608
1609         tbl = &(lq_sta->lq_info[active_tbl]);
1610
1611         /* If we've been disallowing search, see if we should now allow it */
1612         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1613                 /* Elapsed time using current modulation mode */
1614                 if (lq_sta->flush_timer)
1615                         flush_interval_passed =
1616                                 time_after(jiffies,
1617                                            (unsigned long)(lq_sta->flush_timer +
1618                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1619
1620                 /*
1621                  * Check if we should allow search for new modulation mode.
1622                  * If many frames have failed or succeeded, or we've used
1623                  * this same modulation for a long time, allow search, and
1624                  * reset history stats that keep track of whether we should
1625                  * allow a new search.  Also (below) reset all bitmaps and
1626                  * stats in active history.
1627                  */
1628                 if (force_search ||
1629                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1630                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1631                     ((!lq_sta->search_better_tbl) &&
1632                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1633                         IWL_DEBUG_RATE(mvm,
1634                                        "LQ: stay is expired %d %d %d\n",
1635                                      lq_sta->total_failed,
1636                                      lq_sta->total_success,
1637                                      flush_interval_passed);
1638
1639                         /* Allow search for new mode */
1640                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1641                         IWL_DEBUG_RATE(mvm,
1642                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1643                         lq_sta->total_failed = 0;
1644                         lq_sta->total_success = 0;
1645                         lq_sta->flush_timer = 0;
1646                         /* mark the current column as visited */
1647                         lq_sta->visited_columns = BIT(tbl->column);
1648                 /*
1649                  * Else if we've used this modulation mode enough repetitions
1650                  * (regardless of elapsed time or success/failure), reset
1651                  * history bitmaps and rate-specific stats for all rates in
1652                  * active table.
1653                  */
1654                 } else {
1655                         lq_sta->table_count++;
1656                         if (lq_sta->table_count >=
1657                             lq_sta->table_count_limit) {
1658                                 lq_sta->table_count = 0;
1659
1660                                 IWL_DEBUG_RATE(mvm,
1661                                                "LQ: stay in table clear win\n");
1662                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1663                         }
1664                 }
1665
1666                 /* If transitioning to allow "search", reset all history
1667                  * bitmaps and stats in active table (this will become the new
1668                  * "search" table). */
1669                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1670                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1671                 }
1672         }
1673 }
1674
1675 /*
1676  * setup rate table in uCode
1677  */
1678 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1679                                struct ieee80211_sta *sta,
1680                                struct iwl_lq_sta *lq_sta,
1681                                struct iwl_scale_tbl_info *tbl)
1682 {
1683         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1684         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1685 }
1686
1687 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1688                               struct ieee80211_sta *sta,
1689                               struct iwl_lq_sta *lq_sta,
1690                               struct iwl_scale_tbl_info *tbl,
1691                               enum rs_action scale_action)
1692 {
1693         if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1694                 return false;
1695
1696         if (!is_vht_siso(&tbl->rate))
1697                 return false;
1698
1699         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1700             (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1701             (scale_action == RS_ACTION_DOWNSCALE)) {
1702                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1703                 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1704                 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1705                 goto tweaked;
1706         }
1707
1708         /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1709          * sustainable, i.e. we're past the test window. We can't go back
1710          * if MCS5 is just tested as this will happen always after switching
1711          * to 20Mhz MCS4 because the rate stats are cleared.
1712          */
1713         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1714             (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1715              (scale_action == RS_ACTION_STAY)) ||
1716              ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1717               (scale_action == RS_ACTION_UPSCALE)))) {
1718                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1719                 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1720                 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1721                 goto tweaked;
1722         }
1723
1724         return false;
1725
1726 tweaked:
1727         rs_set_expected_tpt_table(lq_sta, tbl);
1728         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1729         return true;
1730 }
1731
1732 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1733                                          struct iwl_lq_sta *lq_sta,
1734                                          struct ieee80211_sta *sta,
1735                                          struct iwl_scale_tbl_info *tbl)
1736 {
1737         int i, j, max_rate;
1738         enum rs_column next_col_id;
1739         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1740         const struct rs_tx_column *next_col;
1741         allow_column_func_t allow_func;
1742         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1743         const u16 *expected_tpt_tbl;
1744         u16 tpt, max_expected_tpt;
1745
1746         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1747                 next_col_id = curr_col->next_columns[i];
1748
1749                 if (next_col_id == RS_COLUMN_INVALID)
1750                         continue;
1751
1752                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1753                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1754                                        next_col_id);
1755                         continue;
1756                 }
1757
1758                 next_col = &rs_tx_columns[next_col_id];
1759
1760                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1761                         IWL_DEBUG_RATE(mvm,
1762                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1763                                        next_col_id, valid_ants, next_col->ant);
1764                         continue;
1765                 }
1766
1767                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1768                         allow_func = next_col->checks[j];
1769                         if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1770                                                       next_col))
1771                                 break;
1772                 }
1773
1774                 if (j != MAX_COLUMN_CHECKS) {
1775                         IWL_DEBUG_RATE(mvm,
1776                                        "Skip column %d: not allowed (check %d failed)\n",
1777                                        next_col_id, j);
1778
1779                         continue;
1780                 }
1781
1782                 tpt = lq_sta->last_tpt / 100;
1783                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1784                                                      rs_bw_from_sta_bw(sta));
1785                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1786                         continue;
1787
1788                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1789                 if (max_rate == IWL_RATE_INVALID) {
1790                         IWL_DEBUG_RATE(mvm,
1791                                        "Skip column %d: no rate is allowed in this column\n",
1792                                        next_col_id);
1793                         continue;
1794                 }
1795
1796                 max_expected_tpt = expected_tpt_tbl[max_rate];
1797                 if (tpt >= max_expected_tpt) {
1798                         IWL_DEBUG_RATE(mvm,
1799                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1800                                        next_col_id, max_expected_tpt, tpt);
1801                         continue;
1802                 }
1803
1804                 IWL_DEBUG_RATE(mvm,
1805                                "Found potential column %d. Max expected %d current %d\n",
1806                                next_col_id, max_expected_tpt, tpt);
1807                 break;
1808         }
1809
1810         if (i == MAX_NEXT_COLUMNS)
1811                 return RS_COLUMN_INVALID;
1812
1813         return next_col_id;
1814 }
1815
1816 static int rs_switch_to_column(struct iwl_mvm *mvm,
1817                                struct iwl_lq_sta *lq_sta,
1818                                struct ieee80211_sta *sta,
1819                                enum rs_column col_id)
1820 {
1821         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1822         struct iwl_scale_tbl_info *search_tbl =
1823                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1824         struct rs_rate *rate = &search_tbl->rate;
1825         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1826         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1827         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1828                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1829         unsigned long rate_mask = 0;
1830         u32 rate_idx = 0;
1831
1832         memcpy(search_tbl, tbl, sz);
1833
1834         rate->sgi = column->sgi;
1835         rate->ant = column->ant;
1836
1837         if (column->mode == RS_LEGACY) {
1838                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1839                         rate->type = LQ_LEGACY_A;
1840                 else
1841                         rate->type = LQ_LEGACY_G;
1842
1843                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1844                 rate->ldpc = false;
1845                 rate_mask = lq_sta->active_legacy_rate;
1846         } else if (column->mode == RS_SISO) {
1847                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1848                 rate_mask = lq_sta->active_siso_rate;
1849         } else if (column->mode == RS_MIMO2) {
1850                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1851                 rate_mask = lq_sta->active_mimo2_rate;
1852         } else {
1853                 WARN_ONCE(1, "Bad column mode");
1854         }
1855
1856         if (column->mode != RS_LEGACY) {
1857                 rate->bw = rs_bw_from_sta_bw(sta);
1858                 rate->ldpc = lq_sta->ldpc;
1859         }
1860
1861         search_tbl->column = col_id;
1862         rs_set_expected_tpt_table(lq_sta, search_tbl);
1863
1864         lq_sta->visited_columns |= BIT(col_id);
1865
1866         /* Get the best matching rate if we're changing modes. e.g.
1867          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1868          */
1869         if (curr_column->mode != column->mode) {
1870                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1871                                             rate_mask, rate->index);
1872
1873                 if ((rate_idx == IWL_RATE_INVALID) ||
1874                     !(BIT(rate_idx) & rate_mask)) {
1875                         IWL_DEBUG_RATE(mvm,
1876                                        "can not switch with index %d"
1877                                        " rate mask %lx\n",
1878                                        rate_idx, rate_mask);
1879
1880                         goto err;
1881                 }
1882
1883                 rate->index = rate_idx;
1884         }
1885
1886         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1887                        col_id, rate->index);
1888
1889         return 0;
1890
1891 err:
1892         rate->type = LQ_NONE;
1893         return -1;
1894 }
1895
1896 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1897                                          struct iwl_scale_tbl_info *tbl,
1898                                          s32 sr, int low, int high,
1899                                          int current_tpt,
1900                                          int low_tpt, int high_tpt)
1901 {
1902         enum rs_action action = RS_ACTION_STAY;
1903
1904         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1905             (current_tpt == 0)) {
1906                 IWL_DEBUG_RATE(mvm,
1907                                "Decrease rate because of low SR\n");
1908                 return RS_ACTION_DOWNSCALE;
1909         }
1910
1911         if ((low_tpt == IWL_INVALID_VALUE) &&
1912             (high_tpt == IWL_INVALID_VALUE) &&
1913             (high != IWL_RATE_INVALID)) {
1914                 IWL_DEBUG_RATE(mvm,
1915                                "No data about high/low rates. Increase rate\n");
1916                 return RS_ACTION_UPSCALE;
1917         }
1918
1919         if ((high_tpt == IWL_INVALID_VALUE) &&
1920             (high != IWL_RATE_INVALID) &&
1921             (low_tpt != IWL_INVALID_VALUE) &&
1922             (low_tpt < current_tpt)) {
1923                 IWL_DEBUG_RATE(mvm,
1924                                "No data about high rate and low rate is worse. Increase rate\n");
1925                 return RS_ACTION_UPSCALE;
1926         }
1927
1928         if ((high_tpt != IWL_INVALID_VALUE) &&
1929             (high_tpt > current_tpt)) {
1930                 IWL_DEBUG_RATE(mvm,
1931                                "Higher rate is better. Increate rate\n");
1932                 return RS_ACTION_UPSCALE;
1933         }
1934
1935         if ((low_tpt != IWL_INVALID_VALUE) &&
1936             (high_tpt != IWL_INVALID_VALUE) &&
1937             (low_tpt < current_tpt) &&
1938             (high_tpt < current_tpt)) {
1939                 IWL_DEBUG_RATE(mvm,
1940                                "Both high and low are worse. Maintain rate\n");
1941                 return RS_ACTION_STAY;
1942         }
1943
1944         if ((low_tpt != IWL_INVALID_VALUE) &&
1945             (low_tpt > current_tpt)) {
1946                 IWL_DEBUG_RATE(mvm,
1947                                "Lower rate is better\n");
1948                 action = RS_ACTION_DOWNSCALE;
1949                 goto out;
1950         }
1951
1952         if ((low_tpt == IWL_INVALID_VALUE) &&
1953             (low != IWL_RATE_INVALID)) {
1954                 IWL_DEBUG_RATE(mvm,
1955                                "No data about lower rate\n");
1956                 action = RS_ACTION_DOWNSCALE;
1957                 goto out;
1958         }
1959
1960         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1961
1962 out:
1963         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1964                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1965                         IWL_DEBUG_RATE(mvm,
1966                                        "SR is above NO DECREASE. Avoid downscale\n");
1967                         action = RS_ACTION_STAY;
1968                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1969                         IWL_DEBUG_RATE(mvm,
1970                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1971                         action = RS_ACTION_STAY;
1972                 } else {
1973                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1974                 }
1975         }
1976
1977         return action;
1978 }
1979
1980 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1981                           struct iwl_lq_sta *lq_sta)
1982 {
1983         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1984          * supports STBC of at least 1*SS
1985          */
1986         if (!lq_sta->stbc_capable)
1987                 return false;
1988
1989         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1990                 return false;
1991
1992         return true;
1993 }
1994
1995 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1996                                 int *weaker, int *stronger)
1997 {
1998         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1999         if (*weaker > TPC_MAX_REDUCTION)
2000                 *weaker = TPC_INVALID;
2001
2002         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2003         if (*stronger < 0)
2004                 *stronger = TPC_INVALID;
2005 }
2006
2007 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2008                            struct rs_rate *rate, enum ieee80211_band band)
2009 {
2010         int index = rate->index;
2011         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2012         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2013                                 !vif->bss_conf.ps);
2014
2015         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2016                        cam, sta_ps_disabled);
2017         /*
2018          * allow tpc only if power management is enabled, or bt coex
2019          * activity grade allows it and we are on 2.4Ghz.
2020          */
2021         if ((cam || sta_ps_disabled) &&
2022             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2023                 return false;
2024
2025         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2026         if (is_legacy(rate))
2027                 return index == IWL_RATE_54M_INDEX;
2028         if (is_ht(rate))
2029                 return index == IWL_RATE_MCS_7_INDEX;
2030         if (is_vht(rate))
2031                 return index == IWL_RATE_MCS_7_INDEX ||
2032                        index == IWL_RATE_MCS_8_INDEX ||
2033                        index == IWL_RATE_MCS_9_INDEX;
2034
2035         WARN_ON_ONCE(1);
2036         return false;
2037 }
2038
2039 enum tpc_action {
2040         TPC_ACTION_STAY,
2041         TPC_ACTION_DECREASE,
2042         TPC_ACTION_INCREASE,
2043         TPC_ACTION_NO_RESTIRCTION,
2044 };
2045
2046 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2047                                          s32 sr, int weak, int strong,
2048                                          int current_tpt,
2049                                          int weak_tpt, int strong_tpt)
2050 {
2051         /* stay until we have valid tpt */
2052         if (current_tpt == IWL_INVALID_VALUE) {
2053                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2054                 return TPC_ACTION_STAY;
2055         }
2056
2057         /* Too many failures, increase txp */
2058         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2059             current_tpt == 0) {
2060                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2061                 return TPC_ACTION_NO_RESTIRCTION;
2062         }
2063
2064         /* try decreasing first if applicable */
2065         if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2066             weak != TPC_INVALID) {
2067                 if (weak_tpt == IWL_INVALID_VALUE &&
2068                     (strong_tpt == IWL_INVALID_VALUE ||
2069                      current_tpt >= strong_tpt)) {
2070                         IWL_DEBUG_RATE(mvm,
2071                                        "no weak txp measurement. decrease txp\n");
2072                         return TPC_ACTION_DECREASE;
2073                 }
2074
2075                 if (weak_tpt > current_tpt) {
2076                         IWL_DEBUG_RATE(mvm,
2077                                        "lower txp has better tpt. decrease txp\n");
2078                         return TPC_ACTION_DECREASE;
2079                 }
2080         }
2081
2082         /* next, increase if needed */
2083         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2084             strong != TPC_INVALID) {
2085                 if (weak_tpt == IWL_INVALID_VALUE &&
2086                     strong_tpt != IWL_INVALID_VALUE &&
2087                     current_tpt < strong_tpt) {
2088                         IWL_DEBUG_RATE(mvm,
2089                                        "higher txp has better tpt. increase txp\n");
2090                         return TPC_ACTION_INCREASE;
2091                 }
2092
2093                 if (weak_tpt < current_tpt &&
2094                     (strong_tpt == IWL_INVALID_VALUE ||
2095                      strong_tpt > current_tpt)) {
2096                         IWL_DEBUG_RATE(mvm,
2097                                        "lower txp has worse tpt. increase txp\n");
2098                         return TPC_ACTION_INCREASE;
2099                 }
2100         }
2101
2102         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2103         return TPC_ACTION_STAY;
2104 }
2105
2106 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2107                            struct ieee80211_sta *sta,
2108                            struct iwl_lq_sta *lq_sta,
2109                            struct iwl_scale_tbl_info *tbl)
2110 {
2111         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2112         struct ieee80211_vif *vif = mvm_sta->vif;
2113         struct ieee80211_chanctx_conf *chanctx_conf;
2114         enum ieee80211_band band;
2115         struct iwl_rate_scale_data *window;
2116         struct rs_rate *rate = &tbl->rate;
2117         enum tpc_action action;
2118         s32 sr;
2119         u8 cur = lq_sta->lq.reduced_tpc;
2120         int current_tpt;
2121         int weak, strong;
2122         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2123
2124 #ifdef CONFIG_MAC80211_DEBUGFS
2125         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2126                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2127                                lq_sta->pers.dbg_fixed_txp_reduction);
2128                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2129                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2130         }
2131 #endif
2132
2133         rcu_read_lock();
2134         chanctx_conf = rcu_dereference(vif->chanctx_conf);
2135         if (WARN_ON(!chanctx_conf))
2136                 band = IEEE80211_NUM_BANDS;
2137         else
2138                 band = chanctx_conf->def.chan->band;
2139         rcu_read_unlock();
2140
2141         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2142                 IWL_DEBUG_RATE(mvm,
2143                                "tpc is not allowed. remove txp restrictions\n");
2144                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2145                 return cur != TPC_NO_REDUCTION;
2146         }
2147
2148         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2149
2150         /* Collect measured throughputs for current and adjacent rates */
2151         window = tbl->tpc_win;
2152         sr = window[cur].success_ratio;
2153         current_tpt = window[cur].average_tpt;
2154         if (weak != TPC_INVALID)
2155                 weak_tpt = window[weak].average_tpt;
2156         if (strong != TPC_INVALID)
2157                 strong_tpt = window[strong].average_tpt;
2158
2159         IWL_DEBUG_RATE(mvm,
2160                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2161                        cur, current_tpt, sr, weak, strong,
2162                        weak_tpt, strong_tpt);
2163
2164         action = rs_get_tpc_action(mvm, sr, weak, strong,
2165                                    current_tpt, weak_tpt, strong_tpt);
2166
2167         /* override actions if we are on the edge */
2168         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2169                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2170                 action = TPC_ACTION_STAY;
2171         } else if (strong == TPC_INVALID &&
2172                    (action == TPC_ACTION_INCREASE ||
2173                     action == TPC_ACTION_NO_RESTIRCTION)) {
2174                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2175                 action = TPC_ACTION_STAY;
2176         }
2177
2178         switch (action) {
2179         case TPC_ACTION_DECREASE:
2180                 lq_sta->lq.reduced_tpc = weak;
2181                 return true;
2182         case TPC_ACTION_INCREASE:
2183                 lq_sta->lq.reduced_tpc = strong;
2184                 return true;
2185         case TPC_ACTION_NO_RESTIRCTION:
2186                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2187                 return true;
2188         case TPC_ACTION_STAY:
2189                 /* do nothing */
2190                 break;
2191         }
2192         return false;
2193 }
2194
2195 /*
2196  * Do rate scaling and search for new modulation mode.
2197  */
2198 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2199                                   struct ieee80211_sta *sta,
2200                                   struct iwl_lq_sta *lq_sta,
2201                                   int tid)
2202 {
2203         int low = IWL_RATE_INVALID;
2204         int high = IWL_RATE_INVALID;
2205         int index;
2206         struct iwl_rate_scale_data *window = NULL;
2207         int current_tpt = IWL_INVALID_VALUE;
2208         int low_tpt = IWL_INVALID_VALUE;
2209         int high_tpt = IWL_INVALID_VALUE;
2210         u32 fail_count;
2211         enum rs_action scale_action = RS_ACTION_STAY;
2212         u16 rate_mask;
2213         u8 update_lq = 0;
2214         struct iwl_scale_tbl_info *tbl, *tbl1;
2215         u8 active_tbl = 0;
2216         u8 done_search = 0;
2217         u16 high_low;
2218         s32 sr;
2219         u8 prev_agg = lq_sta->is_agg;
2220         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2221         struct iwl_mvm_tid_data *tid_data;
2222         struct rs_rate *rate;
2223
2224         lq_sta->is_agg = !!sta_priv->agg_tids;
2225
2226         /*
2227          * Select rate-scale / modulation-mode table to work with in
2228          * the rest of this function:  "search" if searching for better
2229          * modulation mode, or "active" if doing rate scaling within a mode.
2230          */
2231         if (!lq_sta->search_better_tbl)
2232                 active_tbl = lq_sta->active_tbl;
2233         else
2234                 active_tbl = 1 - lq_sta->active_tbl;
2235
2236         tbl = &(lq_sta->lq_info[active_tbl]);
2237         rate = &tbl->rate;
2238
2239         if (prev_agg != lq_sta->is_agg) {
2240                 IWL_DEBUG_RATE(mvm,
2241                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2242                                prev_agg, lq_sta->is_agg);
2243                 rs_set_expected_tpt_table(lq_sta, tbl);
2244                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2245         }
2246
2247         /* current tx rate */
2248         index = rate->index;
2249
2250         /* rates available for this association, and for modulation mode */
2251         rate_mask = rs_get_supported_rates(lq_sta, rate);
2252
2253         if (!(BIT(index) & rate_mask)) {
2254                 IWL_ERR(mvm, "Current Rate is not valid\n");
2255                 if (lq_sta->search_better_tbl) {
2256                         /* revert to active table if search table is not valid*/
2257                         rate->type = LQ_NONE;
2258                         lq_sta->search_better_tbl = 0;
2259                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2260                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2261                 }
2262                 return;
2263         }
2264
2265         /* Get expected throughput table and history window for current rate */
2266         if (!tbl->expected_tpt) {
2267                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2268                 return;
2269         }
2270
2271         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2272         window = &(tbl->win[index]);
2273
2274         /*
2275          * If there is not enough history to calculate actual average
2276          * throughput, keep analyzing results of more tx frames, without
2277          * changing rate or mode (bypass most of the rest of this function).
2278          * Set up new rate table in uCode only if old rate is not supported
2279          * in current association (use new rate found above).
2280          */
2281         fail_count = window->counter - window->success_counter;
2282         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2283             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2284                 IWL_DEBUG_RATE(mvm,
2285                                "%s: Test Window: succ %d total %d\n",
2286                                rs_pretty_rate(rate),
2287                                window->success_counter, window->counter);
2288
2289                 /* Can't calculate this yet; not enough history */
2290                 window->average_tpt = IWL_INVALID_VALUE;
2291
2292                 /* Should we stay with this modulation mode,
2293                  * or search for a new one? */
2294                 rs_stay_in_table(lq_sta, false);
2295
2296                 return;
2297         }
2298
2299         /* If we are searching for better modulation mode, check success. */
2300         if (lq_sta->search_better_tbl) {
2301                 /* If good success, continue using the "search" mode;
2302                  * no need to send new link quality command, since we're
2303                  * continuing to use the setup that we've been trying. */
2304                 if (window->average_tpt > lq_sta->last_tpt) {
2305                         IWL_DEBUG_RATE(mvm,
2306                                        "SWITCHING TO NEW TABLE SR: %d "
2307                                        "cur-tpt %d old-tpt %d\n",
2308                                        window->success_ratio,
2309                                        window->average_tpt,
2310                                        lq_sta->last_tpt);
2311
2312                         /* Swap tables; "search" becomes "active" */
2313                         lq_sta->active_tbl = active_tbl;
2314                         current_tpt = window->average_tpt;
2315                 /* Else poor success; go back to mode in "active" table */
2316                 } else {
2317                         IWL_DEBUG_RATE(mvm,
2318                                        "GOING BACK TO THE OLD TABLE: SR %d "
2319                                        "cur-tpt %d old-tpt %d\n",
2320                                        window->success_ratio,
2321                                        window->average_tpt,
2322                                        lq_sta->last_tpt);
2323
2324                         /* Nullify "search" table */
2325                         rate->type = LQ_NONE;
2326
2327                         /* Revert to "active" table */
2328                         active_tbl = lq_sta->active_tbl;
2329                         tbl = &(lq_sta->lq_info[active_tbl]);
2330
2331                         /* Revert to "active" rate and throughput info */
2332                         index = tbl->rate.index;
2333                         current_tpt = lq_sta->last_tpt;
2334
2335                         /* Need to set up a new rate table in uCode */
2336                         update_lq = 1;
2337                 }
2338
2339                 /* Either way, we've made a decision; modulation mode
2340                  * search is done, allow rate adjustment next time. */
2341                 lq_sta->search_better_tbl = 0;
2342                 done_search = 1;        /* Don't switch modes below! */
2343                 goto lq_update;
2344         }
2345
2346         /* (Else) not in search of better modulation mode, try for better
2347          * starting rate, while staying in this mode. */
2348         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2349         low = high_low & 0xff;
2350         high = (high_low >> 8) & 0xff;
2351
2352         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2353
2354         sr = window->success_ratio;
2355
2356         /* Collect measured throughputs for current and adjacent rates */
2357         current_tpt = window->average_tpt;
2358         if (low != IWL_RATE_INVALID)
2359                 low_tpt = tbl->win[low].average_tpt;
2360         if (high != IWL_RATE_INVALID)
2361                 high_tpt = tbl->win[high].average_tpt;
2362
2363         IWL_DEBUG_RATE(mvm,
2364                        "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2365                        rs_pretty_rate(rate), current_tpt, sr,
2366                        low, high, low_tpt, high_tpt);
2367
2368         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2369                                           current_tpt, low_tpt, high_tpt);
2370
2371         /* Force a search in case BT doesn't like us being in MIMO */
2372         if (is_mimo(rate) &&
2373             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2374                 IWL_DEBUG_RATE(mvm,
2375                                "BT Coex forbids MIMO. Search for new config\n");
2376                 rs_stay_in_table(lq_sta, true);
2377                 goto lq_update;
2378         }
2379
2380         switch (scale_action) {
2381         case RS_ACTION_DOWNSCALE:
2382                 /* Decrease starting rate, update uCode's rate table */
2383                 if (low != IWL_RATE_INVALID) {
2384                         update_lq = 1;
2385                         index = low;
2386                 } else {
2387                         IWL_DEBUG_RATE(mvm,
2388                                        "At the bottom rate. Can't decrease\n");
2389                 }
2390
2391                 break;
2392         case RS_ACTION_UPSCALE:
2393                 /* Increase starting rate, update uCode's rate table */
2394                 if (high != IWL_RATE_INVALID) {
2395                         update_lq = 1;
2396                         index = high;
2397                 } else {
2398                         IWL_DEBUG_RATE(mvm,
2399                                        "At the top rate. Can't increase\n");
2400                 }
2401
2402                 break;
2403         case RS_ACTION_STAY:
2404                 /* No change */
2405                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2406                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2407                 break;
2408         default:
2409                 break;
2410         }
2411
2412 lq_update:
2413         /* Replace uCode's rate table for the destination station. */
2414         if (update_lq) {
2415                 tbl->rate.index = index;
2416                 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2417                         rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2418                 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2419         }
2420
2421         rs_stay_in_table(lq_sta, false);
2422
2423         /*
2424          * Search for new modulation mode if we're:
2425          * 1)  Not changing rates right now
2426          * 2)  Not just finishing up a search
2427          * 3)  Allowing a new search
2428          */
2429         if (!update_lq && !done_search &&
2430             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2431             && window->counter) {
2432                 enum rs_column next_column;
2433
2434                 /* Save current throughput to compare with "search" throughput*/
2435                 lq_sta->last_tpt = current_tpt;
2436
2437                 IWL_DEBUG_RATE(mvm,
2438                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2439                                update_lq, done_search, lq_sta->rs_state,
2440                                window->counter);
2441
2442                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2443                 if (next_column != RS_COLUMN_INVALID) {
2444                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2445                                                       next_column);
2446                         if (!ret)
2447                                 lq_sta->search_better_tbl = 1;
2448                 } else {
2449                         IWL_DEBUG_RATE(mvm,
2450                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2451                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2452                 }
2453
2454                 /* If new "search" mode was selected, set up in uCode table */
2455                 if (lq_sta->search_better_tbl) {
2456                         /* Access the "search" table, clear its history. */
2457                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2458                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2459
2460                         /* Use new "search" start rate */
2461                         index = tbl->rate.index;
2462
2463                         rs_dump_rate(mvm, &tbl->rate,
2464                                      "Switch to SEARCH TABLE:");
2465                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2466                 } else {
2467                         done_search = 1;
2468                 }
2469         }
2470
2471         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2472                 /* If the "active" (non-search) mode was legacy,
2473                  * and we've tried switching antennas,
2474                  * but we haven't been able to try HT modes (not available),
2475                  * stay with best antenna legacy modulation for a while
2476                  * before next round of mode comparisons. */
2477                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2478                 if (is_legacy(&tbl1->rate)) {
2479                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2480
2481                         if (tid != IWL_MAX_TID_COUNT) {
2482                                 tid_data = &sta_priv->tid_data[tid];
2483                                 if (tid_data->state != IWL_AGG_OFF) {
2484                                         IWL_DEBUG_RATE(mvm,
2485                                                        "Stop aggregation on tid %d\n",
2486                                                        tid);
2487                                         ieee80211_stop_tx_ba_session(sta, tid);
2488                                 }
2489                         }
2490                         rs_set_stay_in_table(mvm, 1, lq_sta);
2491                 } else {
2492                 /* If we're in an HT mode, and all 3 mode switch actions
2493                  * have been tried and compared, stay in this best modulation
2494                  * mode for a while before next round of mode comparisons. */
2495                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2496                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2497                             (tid != IWL_MAX_TID_COUNT)) {
2498                                 tid_data = &sta_priv->tid_data[tid];
2499                                 if (tid_data->state == IWL_AGG_OFF) {
2500                                         IWL_DEBUG_RATE(mvm,
2501                                                        "try to aggregate tid %d\n",
2502                                                        tid);
2503                                         rs_tl_turn_on_agg(mvm, tid,
2504                                                           lq_sta, sta);
2505                                 }
2506                         }
2507                         rs_set_stay_in_table(mvm, 0, lq_sta);
2508                 }
2509         }
2510 }
2511
2512 struct rs_init_rate_info {
2513         s8 rssi;
2514         u8 rate_idx;
2515 };
2516
2517 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2518         { -60, IWL_RATE_54M_INDEX },
2519         { -64, IWL_RATE_48M_INDEX },
2520         { -68, IWL_RATE_36M_INDEX },
2521         { -80, IWL_RATE_24M_INDEX },
2522         { -84, IWL_RATE_18M_INDEX },
2523         { -85, IWL_RATE_12M_INDEX },
2524         { -86, IWL_RATE_11M_INDEX },
2525         { -88, IWL_RATE_5M_INDEX  },
2526         { -90, IWL_RATE_2M_INDEX  },
2527         { S8_MIN, IWL_RATE_1M_INDEX },
2528 };
2529
2530 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2531         { -60, IWL_RATE_54M_INDEX },
2532         { -64, IWL_RATE_48M_INDEX },
2533         { -72, IWL_RATE_36M_INDEX },
2534         { -80, IWL_RATE_24M_INDEX },
2535         { -84, IWL_RATE_18M_INDEX },
2536         { -85, IWL_RATE_12M_INDEX },
2537         { -87, IWL_RATE_9M_INDEX  },
2538         { S8_MIN, IWL_RATE_6M_INDEX },
2539 };
2540
2541 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2542         { -60, IWL_RATE_MCS_7_INDEX },
2543         { -64, IWL_RATE_MCS_6_INDEX },
2544         { -68, IWL_RATE_MCS_5_INDEX },
2545         { -72, IWL_RATE_MCS_4_INDEX },
2546         { -80, IWL_RATE_MCS_3_INDEX },
2547         { -84, IWL_RATE_MCS_2_INDEX },
2548         { -85, IWL_RATE_MCS_1_INDEX },
2549         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2550 };
2551
2552 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2553         { -60, IWL_RATE_MCS_8_INDEX },
2554         { -64, IWL_RATE_MCS_7_INDEX },
2555         { -68, IWL_RATE_MCS_6_INDEX },
2556         { -72, IWL_RATE_MCS_5_INDEX },
2557         { -80, IWL_RATE_MCS_4_INDEX },
2558         { -84, IWL_RATE_MCS_3_INDEX },
2559         { -85, IWL_RATE_MCS_2_INDEX },
2560         { -87, IWL_RATE_MCS_1_INDEX },
2561         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2562 };
2563
2564 static const struct rs_init_rate_info rs_optimal_rates_vht_40_80mhz[] = {
2565         { -60, IWL_RATE_MCS_9_INDEX },
2566         { -64, IWL_RATE_MCS_8_INDEX },
2567         { -68, IWL_RATE_MCS_7_INDEX },
2568         { -72, IWL_RATE_MCS_6_INDEX },
2569         { -80, IWL_RATE_MCS_5_INDEX },
2570         { -84, IWL_RATE_MCS_4_INDEX },
2571         { -85, IWL_RATE_MCS_3_INDEX },
2572         { -87, IWL_RATE_MCS_2_INDEX },
2573         { -88, IWL_RATE_MCS_1_INDEX },
2574         { S8_MIN, IWL_RATE_MCS_0_INDEX },
2575 };
2576
2577 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2578
2579 /* Init the optimal rate based on STA caps
2580  * This combined with rssi is used to report the last tx rate
2581  * to userspace when we haven't transmitted enough frames.
2582  */
2583 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2584                                  struct ieee80211_sta *sta,
2585                                  struct iwl_lq_sta *lq_sta)
2586 {
2587         struct rs_rate *rate = &lq_sta->optimal_rate;
2588
2589         if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2590                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2591         else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2592                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2593         else if (lq_sta->band == IEEE80211_BAND_5GHZ)
2594                 rate->type = LQ_LEGACY_A;
2595         else
2596                 rate->type = LQ_LEGACY_G;
2597
2598         rate->bw = rs_bw_from_sta_bw(sta);
2599         rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2600
2601         /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2602
2603         if (is_mimo(rate)) {
2604                 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2605         } else if (is_siso(rate)) {
2606                 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2607         } else {
2608                 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2609
2610                 if (lq_sta->band == IEEE80211_BAND_5GHZ) {
2611                         lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2612                         lq_sta->optimal_nentries =
2613                                 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2614                 } else {
2615                         lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2616                         lq_sta->optimal_nentries =
2617                                 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2618                 }
2619         }
2620
2621         if (is_vht(rate)) {
2622                 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2623                         lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2624                         lq_sta->optimal_nentries =
2625                                 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2626                 } else {
2627                         lq_sta->optimal_rates = rs_optimal_rates_vht_40_80mhz;
2628                         lq_sta->optimal_nentries =
2629                                 ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz);
2630                 }
2631         } else if (is_ht(rate)) {
2632                 lq_sta->optimal_rates = rs_optimal_rates_ht;
2633                 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2634         }
2635 }
2636
2637 /* Compute the optimal rate index based on RSSI */
2638 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2639                                            struct iwl_lq_sta *lq_sta)
2640 {
2641         struct rs_rate *rate = &lq_sta->optimal_rate;
2642         int i;
2643
2644         rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2645                                      BITS_PER_LONG);
2646
2647         for (i = 0; i < lq_sta->optimal_nentries; i++) {
2648                 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2649
2650                 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2651                     (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2652                         rate->index = rate_idx;
2653                         break;
2654                 }
2655         }
2656
2657         return rate;
2658 }
2659
2660 /* Choose an initial legacy rate and antenna to use based on the RSSI
2661  * of last Rx
2662  */
2663 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2664                                 struct ieee80211_sta *sta,
2665                                 struct iwl_lq_sta *lq_sta,
2666                                 enum ieee80211_band band,
2667                                 struct rs_rate *rate)
2668 {
2669         int i, nentries;
2670         unsigned long active_rate;
2671         s8 best_rssi = S8_MIN;
2672         u8 best_ant = ANT_NONE;
2673         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2674         const struct rs_init_rate_info *initial_rates;
2675
2676         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2677                 if (!(lq_sta->pers.chains & BIT(i)))
2678                         continue;
2679
2680                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2681                         best_rssi = lq_sta->pers.chain_signal[i];
2682                         best_ant = BIT(i);
2683                 }
2684         }
2685
2686         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2687                        rs_pretty_ant(best_ant), best_rssi);
2688
2689         if (best_ant != ANT_A && best_ant != ANT_B)
2690                 rate->ant = first_antenna(valid_tx_ant);
2691         else
2692                 rate->ant = best_ant;
2693
2694         rate->sgi = false;
2695         rate->ldpc = false;
2696         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2697
2698         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2699                                      BITS_PER_LONG);
2700
2701         if (band == IEEE80211_BAND_5GHZ) {
2702                 rate->type = LQ_LEGACY_A;
2703                 initial_rates = rs_optimal_rates_5ghz_legacy;
2704                 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2705         } else {
2706                 rate->type = LQ_LEGACY_G;
2707                 initial_rates = rs_optimal_rates_24ghz_legacy;
2708                 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2709         }
2710
2711         if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2712                 goto out;
2713
2714         /* Start from a higher rate if the corresponding debug capability
2715          * is enabled. The rate is chosen according to AP capabilities.
2716          * In case of VHT/HT when the rssi is low fallback to the case of
2717          * legacy rates.
2718          */
2719         if (sta->vht_cap.vht_supported &&
2720             best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2721                 if (sta->bandwidth >= IEEE80211_STA_RX_BW_40) {
2722                         initial_rates = rs_optimal_rates_vht_40_80mhz;
2723                         nentries = ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz);
2724                         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
2725                                 rate->bw = RATE_MCS_CHAN_WIDTH_80;
2726                         else
2727                                 rate->bw = RATE_MCS_CHAN_WIDTH_40;
2728                 } else if (sta->bandwidth == IEEE80211_STA_RX_BW_20) {
2729                         initial_rates = rs_optimal_rates_vht_20mhz;
2730                         nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2731                         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2732                 } else {
2733                         IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2734                         goto out;
2735                 }
2736                 active_rate = lq_sta->active_siso_rate;
2737                 rate->type = LQ_VHT_SISO;
2738         } else if (sta->ht_cap.ht_supported &&
2739                    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2740                 initial_rates = rs_optimal_rates_ht;
2741                 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2742                 active_rate = lq_sta->active_siso_rate;
2743                 rate->type = LQ_HT_SISO;
2744         } else {
2745                 active_rate = lq_sta->active_legacy_rate;
2746         }
2747
2748         for (i = 0; i < nentries; i++) {
2749                 int rate_idx = initial_rates[i].rate_idx;
2750
2751                 if ((best_rssi >= initial_rates[i].rssi) &&
2752                     (BIT(rate_idx) & active_rate)) {
2753                         rate->index = rate_idx;
2754                         break;
2755                 }
2756         }
2757
2758 out:
2759         rs_dump_rate(mvm, rate, "INITIAL");
2760 }
2761
2762 /* Save info about RSSI of last Rx */
2763 void rs_update_last_rssi(struct iwl_mvm *mvm,
2764                          struct iwl_lq_sta *lq_sta,
2765                          struct ieee80211_rx_status *rx_status)
2766 {
2767         int i;
2768
2769         lq_sta->pers.chains = rx_status->chains;
2770         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2771         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2772         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2773         lq_sta->pers.last_rssi = S8_MIN;
2774
2775         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2776                 if (!(lq_sta->pers.chains & BIT(i)))
2777                         continue;
2778
2779                 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2780                         lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2781         }
2782 }
2783
2784 /**
2785  * rs_initialize_lq - Initialize a station's hardware rate table
2786  *
2787  * The uCode's station table contains a table of fallback rates
2788  * for automatic fallback during transmission.
2789  *
2790  * NOTE: This sets up a default set of values.  These will be replaced later
2791  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2792  *       rc80211_simple.
2793  *
2794  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2795  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2796  *       which requires station table entry to exist).
2797  */
2798 static void rs_initialize_lq(struct iwl_mvm *mvm,
2799                              struct ieee80211_sta *sta,
2800                              struct iwl_lq_sta *lq_sta,
2801                              enum ieee80211_band band,
2802                              bool init)
2803 {
2804         struct iwl_scale_tbl_info *tbl;
2805         struct rs_rate *rate;
2806         u8 active_tbl = 0;
2807
2808         if (!sta || !lq_sta)
2809                 return;
2810
2811         if (!lq_sta->search_better_tbl)
2812                 active_tbl = lq_sta->active_tbl;
2813         else
2814                 active_tbl = 1 - lq_sta->active_tbl;
2815
2816         tbl = &(lq_sta->lq_info[active_tbl]);
2817         rate = &tbl->rate;
2818
2819         rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2820         rs_init_optimal_rate(mvm, sta, lq_sta);
2821
2822         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2823         tbl->column = rs_get_column_from_rate(rate);
2824
2825         rs_set_expected_tpt_table(lq_sta, tbl);
2826         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2827         /* TODO restore station should remember the lq cmd */
2828         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2829 }
2830
2831 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2832                         struct ieee80211_tx_rate_control *txrc)
2833 {
2834         struct sk_buff *skb = txrc->skb;
2835         struct iwl_op_mode *op_mode __maybe_unused =
2836                         (struct iwl_op_mode *)mvm_r;
2837         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2838         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2839         struct iwl_lq_sta *lq_sta = mvm_sta;
2840         struct rs_rate *optimal_rate;
2841         u32 last_ucode_rate;
2842
2843         if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2844                 /* if vif isn't initialized mvm doesn't know about
2845                  * this station, so don't do anything with the it
2846                  */
2847                 sta = NULL;
2848                 mvm_sta = NULL;
2849         }
2850
2851         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2852
2853         /* Treat uninitialized rate scaling data same as non-existing. */
2854         if (lq_sta && !lq_sta->pers.drv) {
2855                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2856                 mvm_sta = NULL;
2857         }
2858
2859         /* Send management frames and NO_ACK data using lowest rate. */
2860         if (rate_control_send_low(sta, mvm_sta, txrc))
2861                 return;
2862
2863         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2864                                   info->band, &info->control.rates[0]);
2865         info->control.rates[0].count = 1;
2866
2867         /* Report the optimal rate based on rssi and STA caps if we haven't
2868          * converged yet (too little traffic) or exploring other modulations
2869          */
2870         if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2871                 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2872                 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2873                                                           optimal_rate);
2874                 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2875                                           &txrc->reported_rate);
2876         }
2877 }
2878
2879 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2880                           gfp_t gfp)
2881 {
2882         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2883         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2884         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2885         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2886
2887         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2888
2889         lq_sta->pers.drv = mvm;
2890 #ifdef CONFIG_MAC80211_DEBUGFS
2891         lq_sta->pers.dbg_fixed_rate = 0;
2892         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2893         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2894 #endif
2895         lq_sta->pers.chains = 0;
2896         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2897         lq_sta->pers.last_rssi = S8_MIN;
2898
2899         return &sta_priv->lq_sta;
2900 }
2901
2902 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2903                                        int nss)
2904 {
2905         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2906                 (0x3 << (2 * (nss - 1)));
2907         rx_mcs >>= (2 * (nss - 1));
2908
2909         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2910                 return IWL_RATE_MCS_7_INDEX;
2911         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2912                 return IWL_RATE_MCS_8_INDEX;
2913         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2914                 return IWL_RATE_MCS_9_INDEX;
2915
2916         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2917         return -1;
2918 }
2919
2920 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2921                                      struct ieee80211_sta_vht_cap *vht_cap,
2922                                      struct iwl_lq_sta *lq_sta)
2923 {
2924         int i;
2925         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2926
2927         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2928                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2929                         if (i == IWL_RATE_9M_INDEX)
2930                                 continue;
2931
2932                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2933                         if (i == IWL_RATE_MCS_9_INDEX &&
2934                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2935                                 continue;
2936
2937                         lq_sta->active_siso_rate |= BIT(i);
2938                 }
2939         }
2940
2941         if (sta->rx_nss < 2)
2942                 return;
2943
2944         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2945         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2946                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2947                         if (i == IWL_RATE_9M_INDEX)
2948                                 continue;
2949
2950                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2951                         if (i == IWL_RATE_MCS_9_INDEX &&
2952                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2953                                 continue;
2954
2955                         lq_sta->active_mimo2_rate |= BIT(i);
2956                 }
2957         }
2958 }
2959
2960 static void rs_ht_init(struct iwl_mvm *mvm,
2961                        struct ieee80211_sta *sta,
2962                        struct iwl_lq_sta *lq_sta,
2963                        struct ieee80211_sta_ht_cap *ht_cap)
2964 {
2965         /* active_siso_rate mask includes 9 MBits (bit 5),
2966          * and CCK (bits 0-3), supp_rates[] does not;
2967          * shift to convert format, force 9 MBits off.
2968          */
2969         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2970         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2971         lq_sta->active_siso_rate &= ~((u16)0x2);
2972         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2973
2974         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2975         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2976         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2977         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2978
2979         if (mvm->cfg->ht_params->ldpc &&
2980             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2981                 lq_sta->ldpc = true;
2982
2983         if (mvm->cfg->ht_params->stbc &&
2984             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2985             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2986                 lq_sta->stbc_capable = true;
2987
2988         lq_sta->is_vht = false;
2989 }
2990
2991 static void rs_vht_init(struct iwl_mvm *mvm,
2992                         struct ieee80211_sta *sta,
2993                         struct iwl_lq_sta *lq_sta,
2994                         struct ieee80211_sta_vht_cap *vht_cap)
2995 {
2996         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2997
2998         if (mvm->cfg->ht_params->ldpc &&
2999             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3000                 lq_sta->ldpc = true;
3001
3002         if (mvm->cfg->ht_params->stbc &&
3003             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3004             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3005                 lq_sta->stbc_capable = true;
3006
3007         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3008             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3009             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3010                 lq_sta->bfer_capable = true;
3011
3012         lq_sta->is_vht = true;
3013 }
3014
3015 #ifdef CONFIG_IWLWIFI_DEBUGFS
3016 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3017 {
3018         spin_lock_bh(&mvm->drv_stats_lock);
3019         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3020         spin_unlock_bh(&mvm->drv_stats_lock);
3021 }
3022
3023 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3024 {
3025         u8 nss = 0, mcs = 0;
3026
3027         spin_lock(&mvm->drv_stats_lock);
3028
3029         if (agg)
3030                 mvm->drv_rx_stats.agg_frames++;
3031
3032         mvm->drv_rx_stats.success_frames++;
3033
3034         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3035         case RATE_MCS_CHAN_WIDTH_20:
3036                 mvm->drv_rx_stats.bw_20_frames++;
3037                 break;
3038         case RATE_MCS_CHAN_WIDTH_40:
3039                 mvm->drv_rx_stats.bw_40_frames++;
3040                 break;
3041         case RATE_MCS_CHAN_WIDTH_80:
3042                 mvm->drv_rx_stats.bw_80_frames++;
3043                 break;
3044         default:
3045                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3046         }
3047
3048         if (rate & RATE_MCS_HT_MSK) {
3049                 mvm->drv_rx_stats.ht_frames++;
3050                 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
3051                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3052         } else if (rate & RATE_MCS_VHT_MSK) {
3053                 mvm->drv_rx_stats.vht_frames++;
3054                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3055                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3056                        RATE_VHT_MCS_NSS_POS) + 1;
3057         } else {
3058                 mvm->drv_rx_stats.legacy_frames++;
3059         }
3060
3061         if (nss == 1)
3062                 mvm->drv_rx_stats.siso_frames++;
3063         else if (nss == 2)
3064                 mvm->drv_rx_stats.mimo2_frames++;
3065
3066         if (rate & RATE_MCS_SGI_MSK)
3067                 mvm->drv_rx_stats.sgi_frames++;
3068         else
3069                 mvm->drv_rx_stats.ngi_frames++;
3070
3071         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3072         mvm->drv_rx_stats.last_frame_idx =
3073                 (mvm->drv_rx_stats.last_frame_idx + 1) %
3074                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3075
3076         spin_unlock(&mvm->drv_stats_lock);
3077 }
3078 #endif
3079
3080 /*
3081  * Called after adding a new station to initialize rate scaling
3082  */
3083 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3084                           enum ieee80211_band band, bool init)
3085 {
3086         int i, j;
3087         struct ieee80211_hw *hw = mvm->hw;
3088         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3089         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3090         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
3091         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
3092         struct ieee80211_supported_band *sband;
3093         unsigned long supp; /* must be unsigned long for for_each_set_bit */
3094
3095         /* clear all non-persistent lq data */
3096         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3097
3098         sband = hw->wiphy->bands[band];
3099
3100         lq_sta->lq.sta_id = sta_priv->sta_id;
3101
3102         for (j = 0; j < LQ_SIZE; j++)
3103                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3104
3105         lq_sta->flush_timer = 0;
3106         lq_sta->last_tx = jiffies;
3107
3108         IWL_DEBUG_RATE(mvm,
3109                        "LQ: *** rate scale station global init for station %d ***\n",
3110                        sta_priv->sta_id);
3111         /* TODO: what is a good starting rate for STA? About middle? Maybe not
3112          * the lowest or the highest rate.. Could consider using RSSI from
3113          * previous packets? Need to have IEEE 802.1X auth succeed immediately
3114          * after assoc.. */
3115
3116         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3117         lq_sta->band = sband->band;
3118         /*
3119          * active legacy rates as per supported rates bitmap
3120          */
3121         supp = sta->supp_rates[sband->band];
3122         lq_sta->active_legacy_rate = 0;
3123         for_each_set_bit(i, &supp, BITS_PER_LONG)
3124                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3125
3126         /* TODO: should probably account for rx_highest for both HT/VHT */
3127         if (!vht_cap || !vht_cap->vht_supported)
3128                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3129         else
3130                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3131
3132         lq_sta->max_legacy_rate_idx =
3133                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3134         lq_sta->max_siso_rate_idx =
3135                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3136         lq_sta->max_mimo2_rate_idx =
3137                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3138
3139         IWL_DEBUG_RATE(mvm,
3140                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3141                        lq_sta->active_legacy_rate,
3142                        lq_sta->active_siso_rate,
3143                        lq_sta->active_mimo2_rate,
3144                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3145                        lq_sta->bfer_capable);
3146         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3147                        lq_sta->max_legacy_rate_idx,
3148                        lq_sta->max_siso_rate_idx,
3149                        lq_sta->max_mimo2_rate_idx);
3150
3151         /* These values will be overridden later */
3152         lq_sta->lq.single_stream_ant_msk =
3153                 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3154         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3155
3156         /* as default allow aggregation for all tids */
3157         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3158         lq_sta->is_agg = 0;
3159 #ifdef CONFIG_IWLWIFI_DEBUGFS
3160         iwl_mvm_reset_frame_stats(mvm);
3161 #endif
3162         rs_initialize_lq(mvm, sta, lq_sta, band, init);
3163 }
3164
3165 static void rs_rate_update(void *mvm_r,
3166                            struct ieee80211_supported_band *sband,
3167                            struct cfg80211_chan_def *chandef,
3168                            struct ieee80211_sta *sta, void *priv_sta,
3169                            u32 changed)
3170 {
3171         u8 tid;
3172         struct iwl_op_mode *op_mode  =
3173                         (struct iwl_op_mode *)mvm_r;
3174         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3175
3176         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3177                 return;
3178
3179         /* Stop any ongoing aggregations as rs starts off assuming no agg */
3180         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3181                 ieee80211_stop_tx_ba_session(sta, tid);
3182
3183         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3184 }
3185
3186 #ifdef CONFIG_MAC80211_DEBUGFS
3187 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3188                                             struct iwl_lq_cmd *lq_cmd,
3189                                             enum ieee80211_band band,
3190                                             u32 ucode_rate)
3191 {
3192         struct rs_rate rate;
3193         int i;
3194         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3195         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3196         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3197
3198         for (i = 0; i < num_rates; i++)
3199                 lq_cmd->rs_table[i] = ucode_rate_le32;
3200
3201         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
3202
3203         if (is_mimo(&rate))
3204                 lq_cmd->mimo_delim = num_rates - 1;
3205         else
3206                 lq_cmd->mimo_delim = 0;
3207
3208         lq_cmd->reduced_tpc = 0;
3209
3210         if (num_of_ant(ant) == 1)
3211                 lq_cmd->single_stream_ant_msk = ant;
3212
3213         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3214 }
3215 #endif /* CONFIG_MAC80211_DEBUGFS */
3216
3217 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3218                                      struct iwl_lq_sta *lq_sta,
3219                                      struct rs_rate *rate,
3220                                      __le32 *rs_table, int *rs_table_index,
3221                                      int num_rates, int num_retries,
3222                                      u8 valid_tx_ant, bool toggle_ant)
3223 {
3224         int i, j;
3225         __le32 ucode_rate;
3226         bool bottom_reached = false;
3227         int prev_rate_idx = rate->index;
3228         int end = LINK_QUAL_MAX_RETRY_NUM;
3229         int index = *rs_table_index;
3230
3231         for (i = 0; i < num_rates && index < end; i++) {
3232                 for (j = 0; j < num_retries && index < end; j++, index++) {
3233                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3234                                                                          rate));
3235                         rs_table[index] = ucode_rate;
3236                         if (toggle_ant)
3237                                 rs_toggle_antenna(valid_tx_ant, rate);
3238                 }
3239
3240                 prev_rate_idx = rate->index;
3241                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3242                 if (bottom_reached && !is_legacy(rate))
3243                         break;
3244         }
3245
3246         if (!bottom_reached && !is_legacy(rate))
3247                 rate->index = prev_rate_idx;
3248
3249         *rs_table_index = index;
3250 }
3251
3252 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3253  * column the rate table should look like this:
3254  *
3255  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3256  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3257  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3258  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3259  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3260  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3261  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3262  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3263  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3264  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3265  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3266  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3267  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3268  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3269  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3270  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3271  */
3272 static void rs_build_rates_table(struct iwl_mvm *mvm,
3273                                  struct ieee80211_sta *sta,
3274                                  struct iwl_lq_sta *lq_sta,
3275                                  const struct rs_rate *initial_rate)
3276 {
3277         struct rs_rate rate;
3278         int num_rates, num_retries, index = 0;
3279         u8 valid_tx_ant = 0;
3280         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3281         bool toggle_ant = false;
3282
3283         memcpy(&rate, initial_rate, sizeof(rate));
3284
3285         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3286
3287         /* TODO: remove old API when min FW API hits 14 */
3288         if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3289             rs_stbc_allow(mvm, sta, lq_sta))
3290                 rate.stbc = true;
3291
3292         if (is_siso(&rate)) {
3293                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3294                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3295         } else if (is_mimo(&rate)) {
3296                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3297                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3298         } else {
3299                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3300                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3301                 toggle_ant = true;
3302         }
3303
3304         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3305                                  num_rates, num_retries, valid_tx_ant,
3306                                  toggle_ant);
3307
3308         rs_get_lower_rate_down_column(lq_sta, &rate);
3309
3310         if (is_siso(&rate)) {
3311                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3312                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3313                 lq_cmd->mimo_delim = index;
3314         } else if (is_legacy(&rate)) {
3315                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3316                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3317         } else {
3318                 WARN_ON_ONCE(1);
3319         }
3320
3321         toggle_ant = true;
3322
3323         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3324                                  num_rates, num_retries, valid_tx_ant,
3325                                  toggle_ant);
3326
3327         rs_get_lower_rate_down_column(lq_sta, &rate);
3328
3329         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3330         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
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 }
3337
3338 struct rs_bfer_active_iter_data {
3339         struct ieee80211_sta *exclude_sta;
3340         struct iwl_mvm_sta *bfer_mvmsta;
3341 };
3342
3343 static void rs_bfer_active_iter(void *_data,
3344                                 struct ieee80211_sta *sta)
3345 {
3346         struct rs_bfer_active_iter_data *data = _data;
3347         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3348         struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3349         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3350
3351         if (sta == data->exclude_sta)
3352                 return;
3353
3354         /* The current sta has BFER allowed */
3355         if (ss_params & LQ_SS_BFER_ALLOWED) {
3356                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3357
3358                 data->bfer_mvmsta = mvmsta;
3359         }
3360 }
3361
3362 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3363 {
3364         int prio = -1;
3365         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3366
3367         switch (viftype) {
3368         case NL80211_IFTYPE_AP:
3369         case NL80211_IFTYPE_P2P_GO:
3370                 prio = 3;
3371                 break;
3372         case NL80211_IFTYPE_P2P_CLIENT:
3373                 prio = 2;
3374                 break;
3375         case NL80211_IFTYPE_STATION:
3376                 prio = 1;
3377                 break;
3378         default:
3379                 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3380                 prio = -1;
3381         }
3382
3383         return prio;
3384 }
3385
3386 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3387 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3388                                 struct iwl_mvm_sta *sta2)
3389 {
3390         int prio1 = rs_bfer_priority(sta1);
3391         int prio2 = rs_bfer_priority(sta2);
3392
3393         if (prio1 > prio2)
3394                 return 1;
3395         if (prio1 < prio2)
3396                 return -1;
3397         return 0;
3398 }
3399
3400 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3401                                 struct ieee80211_sta *sta,
3402                                 struct iwl_lq_sta *lq_sta,
3403                                 const struct rs_rate *initial_rate)
3404 {
3405         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3406         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3407         struct rs_bfer_active_iter_data data = {
3408                 .exclude_sta = sta,
3409                 .bfer_mvmsta = NULL,
3410         };
3411         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3412         u32 ss_params = LQ_SS_PARAMS_VALID;
3413
3414         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3415                 goto out;
3416
3417 #ifdef CONFIG_MAC80211_DEBUGFS
3418         /* Check if forcing the decision is configured.
3419          * Note that SISO is forced by not allowing STBC or BFER
3420          */
3421         if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3422                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3423         else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3424                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3425
3426         if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3427                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3428                                lq_sta->pers.ss_force);
3429                 goto out;
3430         }
3431 #endif
3432
3433         if (lq_sta->stbc_capable)
3434                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3435
3436         if (!lq_sta->bfer_capable)
3437                 goto out;
3438
3439         ieee80211_iterate_stations_atomic(mvm->hw,
3440                                           rs_bfer_active_iter,
3441                                           &data);
3442         bfer_mvmsta = data.bfer_mvmsta;
3443
3444         /* This code is safe as it doesn't run concurrently for different
3445          * stations. This is guaranteed by the fact that calls to
3446          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3447          */
3448         if (!bfer_mvmsta) {
3449                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3450
3451                 ss_params |= LQ_SS_BFER_ALLOWED;
3452                 goto out;
3453         }
3454
3455         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3456                        bfer_mvmsta->sta_id);
3457
3458         /* Disallow BFER on another STA if active and we're a higher priority */
3459         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3460                 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3461                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3462
3463                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3464                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3465                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3466
3467                 ss_params |= LQ_SS_BFER_ALLOWED;
3468                 IWL_DEBUG_RATE(mvm,
3469                                "Lower priority BFER sta found (%d). Switch BFER\n",
3470                                bfer_mvmsta->sta_id);
3471         }
3472 out:
3473         lq_cmd->ss_params = cpu_to_le32(ss_params);
3474 }
3475
3476 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3477                            struct ieee80211_sta *sta,
3478                            struct iwl_lq_sta *lq_sta,
3479                            const struct rs_rate *initial_rate)
3480 {
3481         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3482         struct iwl_mvm_sta *mvmsta;
3483         struct iwl_mvm_vif *mvmvif;
3484
3485         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3486         lq_cmd->agg_time_limit =
3487                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3488
3489 #ifdef CONFIG_MAC80211_DEBUGFS
3490         if (lq_sta->pers.dbg_fixed_rate) {
3491                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3492                                                 lq_sta->band,
3493                                                 lq_sta->pers.dbg_fixed_rate);
3494                 return;
3495         }
3496 #endif
3497         if (WARN_ON_ONCE(!sta || !initial_rate))
3498                 return;
3499
3500         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3501
3502         if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3503                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3504
3505         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3506         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3507
3508         if (num_of_ant(initial_rate->ant) == 1)
3509                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3510
3511         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3512
3513         /*
3514          * In case of low latency, tell the firmware to leave a frame in the
3515          * Tx Fifo so that it can start a transaction in the same TxOP. This
3516          * basically allows the firmware to send bursts.
3517          */
3518         if (iwl_mvm_vif_low_latency(mvmvif))
3519                 lq_cmd->agg_frame_cnt_limit--;
3520
3521         if (mvmsta->vif->p2p)
3522                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3523
3524         lq_cmd->agg_time_limit =
3525                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3526 }
3527
3528 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3529 {
3530         return hw->priv;
3531 }
3532 /* rate scale requires free function to be implemented */
3533 static void rs_free(void *mvm_rate)
3534 {
3535         return;
3536 }
3537
3538 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3539                         void *mvm_sta)
3540 {
3541         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3542         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3543
3544         IWL_DEBUG_RATE(mvm, "enter\n");
3545         IWL_DEBUG_RATE(mvm, "leave\n");
3546 }
3547
3548 #ifdef CONFIG_MAC80211_DEBUGFS
3549 int rs_pretty_print_rate(char *buf, const u32 rate)
3550 {
3551
3552         char *type, *bw;
3553         u8 mcs = 0, nss = 0;
3554         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3555
3556         if (!(rate & RATE_MCS_HT_MSK) &&
3557             !(rate & RATE_MCS_VHT_MSK)) {
3558                 int index = iwl_hwrate_to_plcp_idx(rate);
3559
3560                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3561                                rs_pretty_ant(ant),
3562                                index == IWL_RATE_INVALID ? "BAD" :
3563                                iwl_rate_mcs[index].mbps);
3564         }
3565
3566         if (rate & RATE_MCS_VHT_MSK) {
3567                 type = "VHT";
3568                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3569                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3570                        >> RATE_VHT_MCS_NSS_POS) + 1;
3571         } else if (rate & RATE_MCS_HT_MSK) {
3572                 type = "HT";
3573                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3574         } else {
3575                 type = "Unknown"; /* shouldn't happen */
3576         }
3577
3578         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3579         case RATE_MCS_CHAN_WIDTH_20:
3580                 bw = "20Mhz";
3581                 break;
3582         case RATE_MCS_CHAN_WIDTH_40:
3583                 bw = "40Mhz";
3584                 break;
3585         case RATE_MCS_CHAN_WIDTH_80:
3586                 bw = "80Mhz";
3587                 break;
3588         case RATE_MCS_CHAN_WIDTH_160:
3589                 bw = "160Mhz";
3590                 break;
3591         default:
3592                 bw = "BAD BW";
3593         }
3594
3595         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3596                        type, rs_pretty_ant(ant), bw, mcs, nss,
3597                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3598                        (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3599                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3600                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3601                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3602 }
3603
3604 /**
3605  * Program the device to use fixed rate for frame transmit
3606  * This is for debugging/testing only
3607  * once the device start use fixed rate, we need to reload the module
3608  * to being back the normal operation.
3609  */
3610 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3611                                 struct iwl_lq_sta *lq_sta)
3612 {
3613         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3614         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3615         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3616
3617         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3618                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3619
3620         if (lq_sta->pers.dbg_fixed_rate) {
3621                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3622                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3623         }
3624 }
3625
3626 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3627                         const char __user *user_buf, size_t count, loff_t *ppos)
3628 {
3629         struct iwl_lq_sta *lq_sta = file->private_data;
3630         struct iwl_mvm *mvm;
3631         char buf[64];
3632         size_t buf_size;
3633         u32 parsed_rate;
3634
3635         mvm = lq_sta->pers.drv;
3636         memset(buf, 0, sizeof(buf));
3637         buf_size = min(count, sizeof(buf) -  1);
3638         if (copy_from_user(buf, user_buf, buf_size))
3639                 return -EFAULT;
3640
3641         if (sscanf(buf, "%x", &parsed_rate) == 1)
3642                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3643         else
3644                 lq_sta->pers.dbg_fixed_rate = 0;
3645
3646         rs_program_fix_rate(mvm, lq_sta);
3647
3648         return count;
3649 }
3650
3651 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3652                         char __user *user_buf, size_t count, loff_t *ppos)
3653 {
3654         char *buff;
3655         int desc = 0;
3656         int i = 0;
3657         ssize_t ret;
3658
3659         struct iwl_lq_sta *lq_sta = file->private_data;
3660         struct iwl_mvm *mvm;
3661         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3662         struct rs_rate *rate = &tbl->rate;
3663         u32 ss_params;
3664         mvm = lq_sta->pers.drv;
3665         buff = kmalloc(2048, GFP_KERNEL);
3666         if (!buff)
3667                 return -ENOMEM;
3668
3669         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3670         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3671                         lq_sta->total_failed, lq_sta->total_success,
3672                         lq_sta->active_legacy_rate);
3673         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3674                         lq_sta->pers.dbg_fixed_rate);
3675         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3676             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3677             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3678             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3679         desc += sprintf(buff+desc, "lq type %s\n",
3680                         (is_legacy(rate)) ? "legacy" :
3681                         is_vht(rate) ? "VHT" : "HT");
3682         if (!is_legacy(rate)) {
3683                 desc += sprintf(buff + desc, " %s",
3684                    (is_siso(rate)) ? "SISO" : "MIMO2");
3685                 desc += sprintf(buff + desc, " %s",
3686                                 (is_ht20(rate)) ? "20MHz" :
3687                                 (is_ht40(rate)) ? "40MHz" :
3688                                 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3689                 desc += sprintf(buff + desc, " %s %s %s\n",
3690                                 (rate->sgi) ? "SGI" : "NGI",
3691                                 (rate->ldpc) ? "LDPC" : "BCC",
3692                                 (lq_sta->is_agg) ? "AGG on" : "");
3693         }
3694         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3695                         lq_sta->last_rate_n_flags);
3696         desc += sprintf(buff+desc,
3697                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3698                         lq_sta->lq.flags,
3699                         lq_sta->lq.mimo_delim,
3700                         lq_sta->lq.single_stream_ant_msk,
3701                         lq_sta->lq.dual_stream_ant_msk);
3702
3703         desc += sprintf(buff+desc,
3704                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3705                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3706                         lq_sta->lq.agg_disable_start_th,
3707                         lq_sta->lq.agg_frame_cnt_limit);
3708
3709         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3710         ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3711         desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3712                         (ss_params & LQ_SS_PARAMS_VALID) ?
3713                         "VALID" : "INVALID",
3714                         (ss_params & LQ_SS_BFER_ALLOWED) ?
3715                         ", BFER" : "",
3716                         (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3717                         ", STBC" : "",
3718                         (ss_params & LQ_SS_FORCE) ?
3719                         ", FORCE" : "");
3720         desc += sprintf(buff+desc,
3721                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3722                         lq_sta->lq.initial_rate_index[0],
3723                         lq_sta->lq.initial_rate_index[1],
3724                         lq_sta->lq.initial_rate_index[2],
3725                         lq_sta->lq.initial_rate_index[3]);
3726
3727         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3728                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3729
3730                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3731                 desc += rs_pretty_print_rate(buff+desc, r);
3732         }
3733
3734         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3735         kfree(buff);
3736         return ret;
3737 }
3738
3739 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3740         .write = rs_sta_dbgfs_scale_table_write,
3741         .read = rs_sta_dbgfs_scale_table_read,
3742         .open = simple_open,
3743         .llseek = default_llseek,
3744 };
3745 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3746                         char __user *user_buf, size_t count, loff_t *ppos)
3747 {
3748         char *buff;
3749         int desc = 0;
3750         int i, j;
3751         ssize_t ret;
3752         struct iwl_scale_tbl_info *tbl;
3753         struct rs_rate *rate;
3754         struct iwl_lq_sta *lq_sta = file->private_data;
3755
3756         buff = kmalloc(1024, GFP_KERNEL);
3757         if (!buff)
3758                 return -ENOMEM;
3759
3760         for (i = 0; i < LQ_SIZE; i++) {
3761                 tbl = &(lq_sta->lq_info[i]);
3762                 rate = &tbl->rate;
3763                 desc += sprintf(buff+desc,
3764                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3765                                 "index=%d\n",
3766                                 lq_sta->active_tbl == i ? "*" : "x",
3767                                 rate->type,
3768                                 rate->sgi,
3769                                 is_ht20(rate) ? "20Mhz" :
3770                                 is_ht40(rate) ? "40Mhz" :
3771                                 is_ht80(rate) ? "80Mhz" : "ERR",
3772                                 rate->index);
3773                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3774                         desc += sprintf(buff+desc,
3775                                 "counter=%d success=%d %%=%d\n",
3776                                 tbl->win[j].counter,
3777                                 tbl->win[j].success_counter,
3778                                 tbl->win[j].success_ratio);
3779                 }
3780         }
3781         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3782         kfree(buff);
3783         return ret;
3784 }
3785
3786 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3787         .read = rs_sta_dbgfs_stats_table_read,
3788         .open = simple_open,
3789         .llseek = default_llseek,
3790 };
3791
3792 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3793                                               char __user *user_buf,
3794                                               size_t count, loff_t *ppos)
3795 {
3796         static const char * const column_name[] = {
3797                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3798                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3799                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3800                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3801                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3802                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3803                 [RS_COLUMN_MIMO2] = "MIMO2",
3804                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3805         };
3806
3807         static const char * const rate_name[] = {
3808                 [IWL_RATE_1M_INDEX] = "1M",
3809                 [IWL_RATE_2M_INDEX] = "2M",
3810                 [IWL_RATE_5M_INDEX] = "5.5M",
3811                 [IWL_RATE_11M_INDEX] = "11M",
3812                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3813                 [IWL_RATE_9M_INDEX] = "9M",
3814                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3815                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3816                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3817                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3818                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3819                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3820                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3821                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3822                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3823         };
3824
3825         char *buff, *pos, *endpos;
3826         int col, rate;
3827         ssize_t ret;
3828         struct iwl_lq_sta *lq_sta = file->private_data;
3829         struct rs_rate_stats *stats;
3830         static const size_t bufsz = 1024;
3831
3832         buff = kmalloc(bufsz, GFP_KERNEL);
3833         if (!buff)
3834                 return -ENOMEM;
3835
3836         pos = buff;
3837         endpos = pos + bufsz;
3838
3839         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3840         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3841                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3842         pos += scnprintf(pos, endpos - pos, "\n");
3843
3844         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3845                 pos += scnprintf(pos, endpos - pos,
3846                                  "%s,", column_name[col]);
3847
3848                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3849                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3850                         pos += scnprintf(pos, endpos - pos,
3851                                          "%llu/%llu,",
3852                                          stats->success,
3853                                          stats->total);
3854                 }
3855                 pos += scnprintf(pos, endpos - pos, "\n");
3856         }
3857
3858         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3859         kfree(buff);
3860         return ret;
3861 }
3862
3863 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3864                                                const char __user *user_buf,
3865                                                size_t count, loff_t *ppos)
3866 {
3867         struct iwl_lq_sta *lq_sta = file->private_data;
3868         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3869
3870         return count;
3871 }
3872
3873 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3874         .read = rs_sta_dbgfs_drv_tx_stats_read,
3875         .write = rs_sta_dbgfs_drv_tx_stats_write,
3876         .open = simple_open,
3877         .llseek = default_llseek,
3878 };
3879
3880 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3881                                        char __user *user_buf,
3882                                        size_t count, loff_t *ppos)
3883 {
3884         struct iwl_lq_sta *lq_sta = file->private_data;
3885         char buf[12];
3886         int bufsz = sizeof(buf);
3887         int pos = 0;
3888         static const char * const ss_force_name[] = {
3889                 [RS_SS_FORCE_NONE] = "none",
3890                 [RS_SS_FORCE_STBC] = "stbc",
3891                 [RS_SS_FORCE_BFER] = "bfer",
3892                 [RS_SS_FORCE_SISO] = "siso",
3893         };
3894
3895         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3896                          ss_force_name[lq_sta->pers.ss_force]);
3897         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3898 }
3899
3900 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3901                                         size_t count, loff_t *ppos)
3902 {
3903         struct iwl_mvm *mvm = lq_sta->pers.drv;
3904         int ret = 0;
3905
3906         if (!strncmp("none", buf, 4)) {
3907                 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3908         } else if (!strncmp("siso", buf, 4)) {
3909                 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3910         } else if (!strncmp("stbc", buf, 4)) {
3911                 if (lq_sta->stbc_capable) {
3912                         lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3913                 } else {
3914                         IWL_ERR(mvm,
3915                                 "can't force STBC. peer doesn't support\n");
3916                         ret = -EINVAL;
3917                 }
3918         } else if (!strncmp("bfer", buf, 4)) {
3919                 if (lq_sta->bfer_capable) {
3920                         lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3921                 } else {
3922                         IWL_ERR(mvm,
3923                                 "can't force BFER. peer doesn't support\n");
3924                         ret = -EINVAL;
3925                 }
3926         } else {
3927                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3928                 ret = -EINVAL;
3929         }
3930         return ret ?: count;
3931 }
3932
3933 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3934         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3935 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
3936                 if (!debugfs_create_file(#name, mode, parent, lq_sta,   \
3937                                          &iwl_dbgfs_##name##_ops))      \
3938                         goto err;                                       \
3939         } while (0)
3940
3941 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3942
3943 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
3944 {
3945         struct iwl_lq_sta *lq_sta = priv_sta;
3946         struct iwl_mvm_sta *mvmsta;
3947
3948         mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3949
3950         if (!mvmsta->vif)
3951                 return;
3952
3953         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3954                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
3955         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3956                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
3957         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3958                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3959         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3960                           &lq_sta->tx_agg_tid_en);
3961         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3962                           &lq_sta->pers.dbg_fixed_txp_reduction);
3963
3964         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3965         return;
3966 err:
3967         IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3968 }
3969
3970 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3971 {
3972 }
3973 #endif
3974
3975 /*
3976  * Initialization of rate scaling information is done by driver after
3977  * the station is added. Since mac80211 calls this function before a
3978  * station is added we ignore it.
3979  */
3980 static void rs_rate_init_stub(void *mvm_r,
3981                               struct ieee80211_supported_band *sband,
3982                               struct cfg80211_chan_def *chandef,
3983                               struct ieee80211_sta *sta, void *mvm_sta)
3984 {
3985 }
3986
3987 static const struct rate_control_ops rs_mvm_ops = {
3988         .name = RS_NAME,
3989         .tx_status = rs_mac80211_tx_status,
3990         .get_rate = rs_get_rate,
3991         .rate_init = rs_rate_init_stub,
3992         .alloc = rs_alloc,
3993         .free = rs_free,
3994         .alloc_sta = rs_alloc_sta,
3995         .free_sta = rs_free_sta,
3996         .rate_update = rs_rate_update,
3997 #ifdef CONFIG_MAC80211_DEBUGFS
3998         .add_sta_debugfs = rs_add_debugfs,
3999         .remove_sta_debugfs = rs_remove_debugfs,
4000 #endif
4001 };
4002
4003 int iwl_mvm_rate_control_register(void)
4004 {
4005         return ieee80211_rate_control_register(&rs_mvm_ops);
4006 }
4007
4008 void iwl_mvm_rate_control_unregister(void)
4009 {
4010         ieee80211_rate_control_unregister(&rs_mvm_ops);
4011 }
4012
4013 /**
4014  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
4015  * Tx protection, according to this request and previous requests,
4016  * and send the LQ command.
4017  * @mvmsta: The station
4018  * @enable: Enable Tx protection?
4019  */
4020 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4021                           bool enable)
4022 {
4023         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
4024
4025         lockdep_assert_held(&mvm->mutex);
4026
4027         if (enable) {
4028                 if (mvmsta->tx_protection == 0)
4029                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
4030                 mvmsta->tx_protection++;
4031         } else {
4032                 mvmsta->tx_protection--;
4033                 if (mvmsta->tx_protection == 0)
4034                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4035         }
4036
4037         return iwl_mvm_send_lq_cmd(mvm, lq, false);
4038 }