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  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of version 2 of the GNU General Public License as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  18  *
  19  * The full GNU General Public License is included in this distribution in the
  20  * file called LICENSE.
  21  *
  22  * Contact Information:
  23  *  Intel Linux Wireless <linuxwifi@intel.com>
  24  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  25  *
  26  *****************************************************************************/
  27 #include <linux/kernel.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/slab.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37 #include "rs.h"
  38 #include "fw-api.h"
  39 #include "sta.h"
  40 #include "iwl-op-mode.h"
  41 #include "mvm.h"
  42 #include "debugfs.h"
  43
  44 #define RS_NAME "iwl-mvm-rs"
  45
  46 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  47
  48 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
  49  * Use this macro when dealing with thresholds consts set as a percentage
  50  */
  51 #define RS_PERCENT(x) (128 * x)
  52
  53 static u8 rs_ht_to_legacy[] = {
  54         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  55         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  56         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  57         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  58         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  59         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  60         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  61         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  62         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  63         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  64 };
  65
  66 static const u8 ant_toggle_lookup[] = {
  67         [ANT_NONE] = ANT_NONE,
  68         [ANT_A] = ANT_B,
  69         [ANT_B] = ANT_C,
  70         [ANT_AB] = ANT_BC,
  71         [ANT_C] = ANT_A,
  72         [ANT_AC] = ANT_AB,
  73         [ANT_BC] = ANT_AC,
  74         [ANT_ABC] = ANT_ABC,
  75 };
  76
  77 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  78         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  79                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  80                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  81                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  82                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  83                                     IWL_RATE_##rp##M_INDEX,           \
  84                                     IWL_RATE_##rn##M_INDEX }
  85
  86 #define IWL_DECLARE_MCS_RATE(s)                                           \
  87         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
  88                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
  89                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
  90                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
  91                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
  92                                        IWL_RATE_INVM_INDEX,               \
  93                                        IWL_RATE_INVM_INDEX }
  94
  95 /*
  96  * Parameter order:
  97  *   rate, ht rate, prev rate, next rate
  98  *
  99  * If there isn't a valid next or previous rate then INV is used which
 100  * maps to IWL_RATE_INVALID
 101  *
 102  */
 103 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 104         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 105         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 106         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 107         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 108         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 109         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 110         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 111         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 112         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 113         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 114         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 115         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 116         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 117         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 118         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 119 };
 120
 121 enum rs_action {
 122         RS_ACTION_STAY = 0,
 123         RS_ACTION_DOWNSCALE = -1,
 124         RS_ACTION_UPSCALE = 1,
 125 };
 126
 127 enum rs_column_mode {
 128         RS_INVALID = 0,
 129         RS_LEGACY,
 130         RS_SISO,
 131         RS_MIMO2,
 132 };
 133
 134 #define MAX_NEXT_COLUMNS 7
 135 #define MAX_COLUMN_CHECKS 3
 136
 137 struct rs_tx_column;
 138
 139 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 140                                      struct ieee80211_sta *sta,
 141                                      struct rs_rate *rate,
 142                                      const struct rs_tx_column *next_col);
 143
 144 struct rs_tx_column {
 145         enum rs_column_mode mode;
 146         u8 ant;
 147         bool sgi;
 148         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 149         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 150 };
 151
 152 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 153                          struct rs_rate *rate,
 154                          const struct rs_tx_column *next_col)
 155 {
 156         return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
 157 }
 158
 159 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 160                           struct rs_rate *rate,
 161                           const struct rs_tx_column *next_col)
 162 {
 163         struct iwl_mvm_sta *mvmsta;
 164         struct iwl_mvm_vif *mvmvif;
 165
 166         if (!sta->ht_cap.ht_supported)
 167                 return false;
 168
 169         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 170                 return false;
 171
 172         if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
 173                 return false;
 174
 175         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 176                 return false;
 177
 178         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 179         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 180
 181         if (mvm->nvm_data->sku_cap_mimo_disabled)
 182                 return false;
 183
 184         return true;
 185 }
 186
 187 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 188                           struct rs_rate *rate,
 189                           const struct rs_tx_column *next_col)
 190 {
 191         if (!sta->ht_cap.ht_supported)
 192                 return false;
 193
 194         return true;
 195 }
 196
 197 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 198                          struct rs_rate *rate,
 199                          const struct rs_tx_column *next_col)
 200 {
 201         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 202         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 203
 204         if (is_ht20(rate) && (ht_cap->cap &
 205                              IEEE80211_HT_CAP_SGI_20))
 206                 return true;
 207         if (is_ht40(rate) && (ht_cap->cap &
 208                              IEEE80211_HT_CAP_SGI_40))
 209                 return true;
 210         if (is_ht80(rate) && (vht_cap->cap &
 211                              IEEE80211_VHT_CAP_SHORT_GI_80))
 212                 return true;
 213
 214         return false;
 215 }
 216
 217 static const struct rs_tx_column rs_tx_columns[] = {
 218         [RS_COLUMN_LEGACY_ANT_A] = {
 219                 .mode = RS_LEGACY,
 220                 .ant = ANT_A,
 221                 .next_columns = {
 222                         RS_COLUMN_LEGACY_ANT_B,
 223                         RS_COLUMN_SISO_ANT_A,
 224                         RS_COLUMN_MIMO2,
 225                         RS_COLUMN_INVALID,
 226                         RS_COLUMN_INVALID,
 227                         RS_COLUMN_INVALID,
 228                         RS_COLUMN_INVALID,
 229                 },
 230                 .checks = {
 231                         rs_ant_allow,
 232                 },
 233         },
 234         [RS_COLUMN_LEGACY_ANT_B] = {
 235                 .mode = RS_LEGACY,
 236                 .ant = ANT_B,
 237                 .next_columns = {
 238                         RS_COLUMN_LEGACY_ANT_A,
 239                         RS_COLUMN_SISO_ANT_B,
 240                         RS_COLUMN_MIMO2,
 241                         RS_COLUMN_INVALID,
 242                         RS_COLUMN_INVALID,
 243                         RS_COLUMN_INVALID,
 244                         RS_COLUMN_INVALID,
 245                 },
 246                 .checks = {
 247                         rs_ant_allow,
 248                 },
 249         },
 250         [RS_COLUMN_SISO_ANT_A] = {
 251                 .mode = RS_SISO,
 252                 .ant = ANT_A,
 253                 .next_columns = {
 254                         RS_COLUMN_SISO_ANT_B,
 255                         RS_COLUMN_MIMO2,
 256                         RS_COLUMN_SISO_ANT_A_SGI,
 257                         RS_COLUMN_LEGACY_ANT_A,
 258                         RS_COLUMN_LEGACY_ANT_B,
 259                         RS_COLUMN_INVALID,
 260                         RS_COLUMN_INVALID,
 261                 },
 262                 .checks = {
 263                         rs_siso_allow,
 264                         rs_ant_allow,
 265                 },
 266         },
 267         [RS_COLUMN_SISO_ANT_B] = {
 268                 .mode = RS_SISO,
 269                 .ant = ANT_B,
 270                 .next_columns = {
 271                         RS_COLUMN_SISO_ANT_A,
 272                         RS_COLUMN_MIMO2,
 273                         RS_COLUMN_SISO_ANT_B_SGI,
 274                         RS_COLUMN_LEGACY_ANT_A,
 275                         RS_COLUMN_LEGACY_ANT_B,
 276                         RS_COLUMN_INVALID,
 277                         RS_COLUMN_INVALID,
 278                 },
 279                 .checks = {
 280                         rs_siso_allow,
 281                         rs_ant_allow,
 282                 },
 283         },
 284         [RS_COLUMN_SISO_ANT_A_SGI] = {
 285                 .mode = RS_SISO,
 286                 .ant = ANT_A,
 287                 .sgi = true,
 288                 .next_columns = {
 289                         RS_COLUMN_SISO_ANT_B_SGI,
 290                         RS_COLUMN_MIMO2_SGI,
 291                         RS_COLUMN_SISO_ANT_A,
 292                         RS_COLUMN_LEGACY_ANT_A,
 293                         RS_COLUMN_LEGACY_ANT_B,
 294                         RS_COLUMN_INVALID,
 295                         RS_COLUMN_INVALID,
 296                 },
 297                 .checks = {
 298                         rs_siso_allow,
 299                         rs_ant_allow,
 300                         rs_sgi_allow,
 301                 },
 302         },
 303         [RS_COLUMN_SISO_ANT_B_SGI] = {
 304                 .mode = RS_SISO,
 305                 .ant = ANT_B,
 306                 .sgi = true,
 307                 .next_columns = {
 308                         RS_COLUMN_SISO_ANT_A_SGI,
 309                         RS_COLUMN_MIMO2_SGI,
 310                         RS_COLUMN_SISO_ANT_B,
 311                         RS_COLUMN_LEGACY_ANT_A,
 312                         RS_COLUMN_LEGACY_ANT_B,
 313                         RS_COLUMN_INVALID,
 314                         RS_COLUMN_INVALID,
 315                 },
 316                 .checks = {
 317                         rs_siso_allow,
 318                         rs_ant_allow,
 319                         rs_sgi_allow,
 320                 },
 321         },
 322         [RS_COLUMN_MIMO2] = {
 323                 .mode = RS_MIMO2,
 324                 .ant = ANT_AB,
 325                 .next_columns = {
 326                         RS_COLUMN_SISO_ANT_A,
 327                         RS_COLUMN_MIMO2_SGI,
 328                         RS_COLUMN_LEGACY_ANT_A,
 329                         RS_COLUMN_LEGACY_ANT_B,
 330                         RS_COLUMN_INVALID,
 331                         RS_COLUMN_INVALID,
 332                         RS_COLUMN_INVALID,
 333                 },
 334                 .checks = {
 335                         rs_mimo_allow,
 336                 },
 337         },
 338         [RS_COLUMN_MIMO2_SGI] = {
 339                 .mode = RS_MIMO2,
 340                 .ant = ANT_AB,
 341                 .sgi = true,
 342                 .next_columns = {
 343                         RS_COLUMN_SISO_ANT_A_SGI,
 344                         RS_COLUMN_MIMO2,
 345                         RS_COLUMN_LEGACY_ANT_A,
 346                         RS_COLUMN_LEGACY_ANT_B,
 347                         RS_COLUMN_INVALID,
 348                         RS_COLUMN_INVALID,
 349                         RS_COLUMN_INVALID,
 350                 },
 351                 .checks = {
 352                         rs_mimo_allow,
 353                         rs_sgi_allow,
 354                 },
 355         },
 356 };
 357
 358 static inline u8 rs_extract_rate(u32 rate_n_flags)
 359 {
 360         /* also works for HT because bits 7:6 are zero there */
 361         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 362 }
 363
 364 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 365 {
 366         int idx = 0;
 367
 368         if (rate_n_flags & RATE_MCS_HT_MSK) {
 369                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 370                 idx += IWL_RATE_MCS_0_INDEX;
 371
 372                 /* skip 9M not supported in HT*/
 373                 if (idx >= IWL_RATE_9M_INDEX)
 374                         idx += 1;
 375                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 376                         return idx;
 377         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 378                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 379                 idx += IWL_RATE_MCS_0_INDEX;
 380
 381                 /* skip 9M not supported in VHT*/
 382                 if (idx >= IWL_RATE_9M_INDEX)
 383                         idx++;
 384                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 385                         return idx;
 386         } else {
 387                 /* legacy rate format, search for match in table */
 388
 389                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 390                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 391                         if (iwl_rates[idx].plcp == legacy_rate)
 392                                 return idx;
 393         }
 394
 395         return IWL_RATE_INVALID;
 396 }
 397
 398 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 399                                   struct ieee80211_sta *sta,
 400                                   struct iwl_lq_sta *lq_sta,
 401                                   int tid);
 402 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 403                            struct ieee80211_sta *sta,
 404                            struct iwl_lq_sta *lq_sta,
 405                            const struct rs_rate *initial_rate);
 406 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 407
 408 /**
 409  * The following tables contain the expected throughput metrics for all rates
 410  *
 411  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 412  *
 413  * where invalid entries are zeros.
 414  *
 415  * CCK rates are only valid in legacy table and will only be used in G
 416  * (2.4 GHz) band.
 417  */
 418
 419 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 420         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 421 };
 422
 423 /* Expected TpT tables. 4 indexes:
 424  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 425  */
 426 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 427         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 428         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 429         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 430         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 431 };
 432
 433 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 434         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 435         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 436         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 437         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 438 };
 439
 440 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 441         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 442         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 443         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 444         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 445 };
 446
 447 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 448         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 449         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 450         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 451         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 452 };
 453
 454 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 455         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 456         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 457         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 458         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 459 };
 460
 461 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 462         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 463         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 464         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 465         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 466 };
 467
 468 /* mbps, mcs */
 469 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 470         {  "1", "BPSK DSSS"},
 471         {  "2", "QPSK DSSS"},
 472         {"5.5", "BPSK CCK"},
 473         { "11", "QPSK CCK"},
 474         {  "6", "BPSK 1/2"},
 475         {  "9", "BPSK 1/2"},
 476         { "12", "QPSK 1/2"},
 477         { "18", "QPSK 3/4"},
 478         { "24", "16QAM 1/2"},
 479         { "36", "16QAM 3/4"},
 480         { "48", "64QAM 2/3"},
 481         { "54", "64QAM 3/4"},
 482         { "60", "64QAM 5/6"},
 483 };
 484
 485 #define MCS_INDEX_PER_STREAM    (8)
 486
 487 static const char *rs_pretty_ant(u8 ant)
 488 {
 489         static const char * const ant_name[] = {
 490                 [ANT_NONE] = "None",
 491                 [ANT_A]    = "A",
 492                 [ANT_B]    = "B",
 493                 [ANT_AB]   = "AB",
 494                 [ANT_C]    = "C",
 495                 [ANT_AC]   = "AC",
 496                 [ANT_BC]   = "BC",
 497                 [ANT_ABC]  = "ABC",
 498         };
 499
 500         if (ant > ANT_ABC)
 501                 return "UNKNOWN";
 502
 503         return ant_name[ant];
 504 }
 505
 506 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 507 {
 508         static const char * const lq_types[] = {
 509                 [LQ_NONE] = "NONE",
 510                 [LQ_LEGACY_A] = "LEGACY_A",
 511                 [LQ_LEGACY_G] = "LEGACY_G",
 512                 [LQ_HT_SISO] = "HT SISO",
 513                 [LQ_HT_MIMO2] = "HT MIMO",
 514                 [LQ_VHT_SISO] = "VHT SISO",
 515                 [LQ_VHT_MIMO2] = "VHT MIMO",
 516         };
 517
 518         if (type < LQ_NONE || type >= LQ_MAX)
 519                 return "UNKNOWN";
 520
 521         return lq_types[type];
 522 }
 523
 524 static char *rs_pretty_rate(const struct rs_rate *rate)
 525 {
 526         static char buf[40];
 527         static const char * const legacy_rates[] = {
 528                 [IWL_RATE_1M_INDEX] = "1M",
 529                 [IWL_RATE_2M_INDEX] = "2M",
 530                 [IWL_RATE_5M_INDEX] = "5.5M",
 531                 [IWL_RATE_11M_INDEX] = "11M",
 532                 [IWL_RATE_6M_INDEX] = "6M",
 533                 [IWL_RATE_9M_INDEX] = "9M",
 534                 [IWL_RATE_12M_INDEX] = "12M",
 535                 [IWL_RATE_18M_INDEX] = "18M",
 536                 [IWL_RATE_24M_INDEX] = "24M",
 537                 [IWL_RATE_36M_INDEX] = "36M",
 538                 [IWL_RATE_48M_INDEX] = "48M",
 539                 [IWL_RATE_54M_INDEX] = "54M",
 540         };
 541         static const char *const ht_vht_rates[] = {
 542                 [IWL_RATE_MCS_0_INDEX] = "MCS0",
 543                 [IWL_RATE_MCS_1_INDEX] = "MCS1",
 544                 [IWL_RATE_MCS_2_INDEX] = "MCS2",
 545                 [IWL_RATE_MCS_3_INDEX] = "MCS3",
 546                 [IWL_RATE_MCS_4_INDEX] = "MCS4",
 547                 [IWL_RATE_MCS_5_INDEX] = "MCS5",
 548                 [IWL_RATE_MCS_6_INDEX] = "MCS6",
 549                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
 550                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
 551                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
 552         };
 553         const char *rate_str;
 554
 555         if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
 556                 rate_str = legacy_rates[rate->index];
 557         else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
 558                  (rate->index <= IWL_RATE_MCS_9_INDEX))
 559                 rate_str = ht_vht_rates[rate->index];
 560         else
 561                 rate_str = "BAD_RATE";
 562
 563         sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
 564                 rs_pretty_ant(rate->ant), rate_str);
 565         return buf;
 566 }
 567
 568 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 569                                 const char *prefix)
 570 {
 571         IWL_DEBUG_RATE(mvm,
 572                        "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
 573                        prefix, rs_pretty_rate(rate), rate->bw,
 574                        rate->sgi, rate->ldpc, rate->stbc);
 575 }
 576
 577 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 578 {
 579         window->data = 0;
 580         window->success_counter = 0;
 581         window->success_ratio = IWL_INVALID_VALUE;
 582         window->counter = 0;
 583         window->average_tpt = IWL_INVALID_VALUE;
 584 }
 585
 586 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 587                                             struct iwl_scale_tbl_info *tbl)
 588 {
 589         int i;
 590
 591         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 592         for (i = 0; i < IWL_RATE_COUNT; i++)
 593                 rs_rate_scale_clear_window(&tbl->win[i]);
 594
 595         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 596                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 597 }
 598
 599 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 600 {
 601         return (ant_type & valid_antenna) == ant_type;
 602 }
 603
 604 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 605                                      struct iwl_lq_sta *lq_data, u8 tid,
 606                                      struct ieee80211_sta *sta)
 607 {
 608         int ret = -EAGAIN;
 609
 610         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 611                      sta->addr, tid);
 612         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 613         if (ret == -EAGAIN) {
 614                 /*
 615                  * driver and mac80211 is out of sync
 616                  * this might be cause by reloading firmware
 617                  * stop the tx ba session here
 618                  */
 619                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 620                         tid);
 621                 ieee80211_stop_tx_ba_session(sta, tid);
 622         }
 623         return ret;
 624 }
 625
 626 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 627                               struct iwl_lq_sta *lq_data,
 628                               struct ieee80211_sta *sta)
 629 {
 630         if (tid < IWL_MAX_TID_COUNT)
 631                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 632         else
 633                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 634                         tid, IWL_MAX_TID_COUNT);
 635 }
 636
 637 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 638 {
 639         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 640                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 641                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 642 }
 643
 644 /*
 645  * Static function to get the expected throughput from an iwl_scale_tbl_info
 646  * that wraps a NULL pointer check
 647  */
 648 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 649 {
 650         if (tbl->expected_tpt)
 651                 return tbl->expected_tpt[rs_index];
 652         return 0;
 653 }
 654
 655 /**
 656  * rs_collect_tx_data - Update the success/failure sliding window
 657  *
 658  * We keep a sliding window of the last 62 packets transmitted
 659  * at this rate.  window->data contains the bitmask of successful
 660  * packets.
 661  */
 662 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
 663                                struct iwl_scale_tbl_info *tbl,
 664                                int scale_index, int attempts, int successes,
 665                                struct iwl_rate_scale_data *window)
 666 {
 667         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 668         s32 fail_count, tpt;
 669
 670         /* Get expected throughput */
 671         tpt = get_expected_tpt(tbl, scale_index);
 672
 673         /*
 674          * Keep track of only the latest 62 tx frame attempts in this rate's
 675          * history window; anything older isn't really relevant any more.
 676          * If we have filled up the sliding window, drop the oldest attempt;
 677          * if the oldest attempt (highest bit in bitmap) shows "success",
 678          * subtract "1" from the success counter (this is the main reason
 679          * we keep these bitmaps!).
 680          */
 681         while (attempts > 0) {
 682                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 683                         /* remove earliest */
 684                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 685
 686                         if (window->data & mask) {
 687                                 window->data &= ~mask;
 688                                 window->success_counter--;
 689                         }
 690                 }
 691
 692                 /* Increment frames-attempted counter */
 693                 window->counter++;
 694
 695                 /* Shift bitmap by one frame to throw away oldest history */
 696                 window->data <<= 1;
 697
 698                 /* Mark the most recent #successes attempts as successful */
 699                 if (successes > 0) {
 700                         window->success_counter++;
 701                         window->data |= 0x1;
 702                         successes--;
 703                 }
 704
 705                 attempts--;
 706         }
 707
 708         /* Calculate current success ratio, avoid divide-by-0! */
 709         if (window->counter > 0)
 710                 window->success_ratio = 128 * (100 * window->success_counter)
 711                                         / window->counter;
 712         else
 713                 window->success_ratio = IWL_INVALID_VALUE;
 714
 715         fail_count = window->counter - window->success_counter;
 716
 717         /* Calculate average throughput, if we have enough history. */
 718         if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
 719             (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
 720                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 721         else
 722                 window->average_tpt = IWL_INVALID_VALUE;
 723
 724         return 0;
 725 }
 726
 727 static int rs_collect_tx_data(struct iwl_mvm *mvm,
 728                               struct iwl_lq_sta *lq_sta,
 729                               struct iwl_scale_tbl_info *tbl,
 730                               int scale_index, int attempts, int successes,
 731                               u8 reduced_txp)
 732 {
 733         struct iwl_rate_scale_data *window = NULL;
 734         int ret;
 735
 736         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 737                 return -EINVAL;
 738
 739         if (tbl->column != RS_COLUMN_INVALID) {
 740                 struct lq_sta_pers *pers = &lq_sta->pers;
 741
 742                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 743                 pers->tx_stats[tbl->column][scale_index].success += successes;
 744         }
 745
 746         /* Select window for current tx bit rate */
 747         window = &(tbl->win[scale_index]);
 748
 749         ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 750                                   window);
 751         if (ret)
 752                 return ret;
 753
 754         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 755                 return -EINVAL;
 756
 757         window = &tbl->tpc_win[reduced_txp];
 758         return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 759                                    window);
 760 }
 761
 762 /* Convert rs_rate object into ucode rate bitmask */
 763 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 764                                   struct rs_rate *rate)
 765 {
 766         u32 ucode_rate = 0;
 767         int index = rate->index;
 768
 769         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 770                          RATE_MCS_ANT_ABC_MSK);
 771
 772         if (is_legacy(rate)) {
 773                 ucode_rate |= iwl_rates[index].plcp;
 774                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 775                         ucode_rate |= RATE_MCS_CCK_MSK;
 776                 return ucode_rate;
 777         }
 778
 779         if (is_ht(rate)) {
 780                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 781                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 782                         index = IWL_LAST_HT_RATE;
 783                 }
 784                 ucode_rate |= RATE_MCS_HT_MSK;
 785
 786                 if (is_ht_siso(rate))
 787                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 788                 else if (is_ht_mimo2(rate))
 789                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 790                 else
 791                         WARN_ON_ONCE(1);
 792         } else if (is_vht(rate)) {
 793                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 794                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 795                         index = IWL_LAST_VHT_RATE;
 796                 }
 797                 ucode_rate |= RATE_MCS_VHT_MSK;
 798                 if (is_vht_siso(rate))
 799                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 800                 else if (is_vht_mimo2(rate))
 801                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 802                 else
 803                         WARN_ON_ONCE(1);
 804
 805         } else {
 806                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 807         }
 808
 809         if (is_siso(rate) && rate->stbc) {
 810                 /* To enable STBC we need to set both a flag and ANT_AB */
 811                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 812                 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
 813         }
 814
 815         ucode_rate |= rate->bw;
 816         if (rate->sgi)
 817                 ucode_rate |= RATE_MCS_SGI_MSK;
 818         if (rate->ldpc)
 819                 ucode_rate |= RATE_MCS_LDPC_MSK;
 820
 821         return ucode_rate;
 822 }
 823
 824 /* Convert a ucode rate into an rs_rate object */
 825 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 826                                    enum ieee80211_band band,
 827                                    struct rs_rate *rate)
 828 {
 829         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 830         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 831         u8 nss;
 832
 833         memset(rate, 0, sizeof(*rate));
 834         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 835
 836         if (rate->index == IWL_RATE_INVALID)
 837                 return -EINVAL;
 838
 839         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 840
 841         /* Legacy */
 842         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 843             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 844                 if (num_of_ant == 1) {
 845                         if (band == IEEE80211_BAND_5GHZ)
 846                                 rate->type = LQ_LEGACY_A;
 847                         else
 848                                 rate->type = LQ_LEGACY_G;
 849                 }
 850
 851                 return 0;
 852         }
 853
 854         /* HT or VHT */
 855         if (ucode_rate & RATE_MCS_SGI_MSK)
 856                 rate->sgi = true;
 857         if (ucode_rate & RATE_MCS_LDPC_MSK)
 858                 rate->ldpc = true;
 859         if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
 860                 rate->stbc = true;
 861         if (ucode_rate & RATE_MCS_BF_MSK)
 862                 rate->bfer = true;
 863
 864         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 865
 866         if (ucode_rate & RATE_MCS_HT_MSK) {
 867                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 868                        RATE_HT_MCS_NSS_POS) + 1;
 869
 870                 if (nss == 1) {
 871                         rate->type = LQ_HT_SISO;
 872                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 873                                   "stbc %d bfer %d",
 874                                   rate->stbc, rate->bfer);
 875                 } else if (nss == 2) {
 876                         rate->type = LQ_HT_MIMO2;
 877                         WARN_ON_ONCE(num_of_ant != 2);
 878                 } else {
 879                         WARN_ON_ONCE(1);
 880                 }
 881         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 882                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 883                        RATE_VHT_MCS_NSS_POS) + 1;
 884
 885                 if (nss == 1) {
 886                         rate->type = LQ_VHT_SISO;
 887                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 888                                   "stbc %d bfer %d",
 889                                   rate->stbc, rate->bfer);
 890                 } else if (nss == 2) {
 891                         rate->type = LQ_VHT_MIMO2;
 892                         WARN_ON_ONCE(num_of_ant != 2);
 893                 } else {
 894                         WARN_ON_ONCE(1);
 895                 }
 896         }
 897
 898         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
 899         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 900                      !is_vht(rate));
 901
 902         return 0;
 903 }
 904
 905 /* switch to another antenna/antennas and return 1 */
 906 /* if no other valid antenna found, return 0 */
 907 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 908 {
 909         u8 new_ant_type;
 910
 911         if (!rate->ant || rate->ant > ANT_ABC)
 912                 return 0;
 913
 914         if (!rs_is_valid_ant(valid_ant, rate->ant))
 915                 return 0;
 916
 917         new_ant_type = ant_toggle_lookup[rate->ant];
 918
 919         while ((new_ant_type != rate->ant) &&
 920                !rs_is_valid_ant(valid_ant, new_ant_type))
 921                 new_ant_type = ant_toggle_lookup[new_ant_type];
 922
 923         if (new_ant_type == rate->ant)
 924                 return 0;
 925
 926         rate->ant = new_ant_type;
 927
 928         return 1;
 929 }
 930
 931 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 932                                   struct rs_rate *rate)
 933 {
 934         if (is_legacy(rate))
 935                 return lq_sta->active_legacy_rate;
 936         else if (is_siso(rate))
 937                 return lq_sta->active_siso_rate;
 938         else if (is_mimo2(rate))
 939                 return lq_sta->active_mimo2_rate;
 940
 941         WARN_ON_ONCE(1);
 942         return 0;
 943 }
 944
 945 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 946                                 int rate_type)
 947 {
 948         u8 high = IWL_RATE_INVALID;
 949         u8 low = IWL_RATE_INVALID;
 950
 951         /* 802.11A or ht walks to the next literal adjacent rate in
 952          * the rate table */
 953         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 954                 int i;
 955                 u32 mask;
 956
 957                 /* Find the previous rate that is in the rate mask */
 958                 i = index - 1;
 959                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 960                         if (rate_mask & mask) {
 961                                 low = i;
 962                                 break;
 963                         }
 964                 }
 965
 966                 /* Find the next rate that is in the rate mask */
 967                 i = index + 1;
 968                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 969                         if (rate_mask & mask) {
 970                                 high = i;
 971                                 break;
 972                         }
 973                 }
 974
 975                 return (high << 8) | low;
 976         }
 977
 978         low = index;
 979         while (low != IWL_RATE_INVALID) {
 980                 low = iwl_rates[low].prev_rs;
 981                 if (low == IWL_RATE_INVALID)
 982                         break;
 983                 if (rate_mask & (1 << low))
 984                         break;
 985         }
 986
 987         high = index;
 988         while (high != IWL_RATE_INVALID) {
 989                 high = iwl_rates[high].next_rs;
 990                 if (high == IWL_RATE_INVALID)
 991                         break;
 992                 if (rate_mask & (1 << high))
 993                         break;
 994         }
 995
 996         return (high << 8) | low;
 997 }
 998
 999 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1000                                      struct rs_rate *rate)
1001 {
1002         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1003 }
1004
1005 /* Get the next supported lower rate in the current column.
1006  * Return true if bottom rate in the current column was reached
1007  */
1008 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1009                                         struct rs_rate *rate)
1010 {
1011         u8 low;
1012         u16 high_low;
1013         u16 rate_mask;
1014         struct iwl_mvm *mvm = lq_sta->pers.drv;
1015
1016         rate_mask = rs_get_supported_rates(lq_sta, rate);
1017         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1018                                         rate->type);
1019         low = high_low & 0xff;
1020
1021         /* Bottom rate of column reached */
1022         if (low == IWL_RATE_INVALID)
1023                 return true;
1024
1025         rate->index = low;
1026         return false;
1027 }
1028
1029 /* Get the next rate to use following a column downgrade */
1030 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1031                                           struct rs_rate *rate)
1032 {
1033         struct iwl_mvm *mvm = lq_sta->pers.drv;
1034
1035         if (is_legacy(rate)) {
1036                 /* No column to downgrade from Legacy */
1037                 return;
1038         } else if (is_siso(rate)) {
1039                 /* Downgrade to Legacy if we were in SISO */
1040                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1041                         rate->type = LQ_LEGACY_A;
1042                 else
1043                         rate->type = LQ_LEGACY_G;
1044
1045                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1046
1047                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1048                              rate->index > IWL_RATE_MCS_9_INDEX);
1049
1050                 rate->index = rs_ht_to_legacy[rate->index];
1051                 rate->ldpc = false;
1052         } else {
1053                 /* Downgrade to SISO with same MCS if in MIMO  */
1054                 rate->type = is_vht_mimo2(rate) ?
1055                         LQ_VHT_SISO : LQ_HT_SISO;
1056         }
1057
1058         if (num_of_ant(rate->ant) > 1)
1059                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1060
1061         /* Relevant in both switching to SISO or Legacy */
1062         rate->sgi = false;
1063
1064         if (!rs_rate_supported(lq_sta, rate))
1065                 rs_get_lower_rate_in_column(lq_sta, rate);
1066 }
1067
1068 /* Check if both rates are identical
1069  * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1070  * with a rate indicating STBC/BFER and ANT_AB.
1071  */
1072 static inline bool rs_rate_equal(struct rs_rate *a,
1073                                  struct rs_rate *b,
1074                                  bool allow_ant_mismatch)
1075
1076 {
1077         bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1078                 (a->bfer == b->bfer);
1079
1080         if (allow_ant_mismatch) {
1081                 if (a->stbc || a->bfer) {
1082                         WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1083                                   a->stbc, a->bfer, a->ant);
1084                         ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1085                 } else if (b->stbc || b->bfer) {
1086                         WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1087                                   b->stbc, b->bfer, b->ant);
1088                         ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1089                 }
1090         }
1091
1092         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1093                 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1094 }
1095
1096 /* Check if both rates share the same column */
1097 static inline bool rs_rate_column_match(struct rs_rate *a,
1098                                         struct rs_rate *b)
1099 {
1100         bool ant_match;
1101
1102         if (a->stbc || a->bfer)
1103                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1104         else
1105                 ant_match = (a->ant == b->ant);
1106
1107         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1108                 && ant_match;
1109 }
1110
1111 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1112 {
1113         if (is_legacy(rate)) {
1114                 if (rate->ant == ANT_A)
1115                         return RS_COLUMN_LEGACY_ANT_A;
1116
1117                 if (rate->ant == ANT_B)
1118                         return RS_COLUMN_LEGACY_ANT_B;
1119
1120                 goto err;
1121         }
1122
1123         if (is_siso(rate)) {
1124                 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1125                         return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1126                                 RS_COLUMN_SISO_ANT_A;
1127
1128                 if (rate->ant == ANT_B)
1129                         return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1130                                 RS_COLUMN_SISO_ANT_B;
1131
1132                 goto err;
1133         }
1134
1135         if (is_mimo(rate))
1136                 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1137
1138 err:
1139         return RS_COLUMN_INVALID;
1140 }
1141
1142 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1143 {
1144         u8 tid = IWL_MAX_TID_COUNT;
1145
1146         if (ieee80211_is_data_qos(hdr->frame_control)) {
1147                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1148                 tid = qc[0] & 0xf;
1149         }
1150
1151         if (unlikely(tid > IWL_MAX_TID_COUNT))
1152                 tid = IWL_MAX_TID_COUNT;
1153
1154         return tid;
1155 }
1156
1157 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1158                           int tid, struct ieee80211_tx_info *info)
1159 {
1160         int legacy_success;
1161         int retries;
1162         int i;
1163         struct iwl_lq_cmd *table;
1164         u32 lq_hwrate;
1165         struct rs_rate lq_rate, tx_resp_rate;
1166         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1167         u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1168         u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1169         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1170         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1171         bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa,
1172                                              IWL_UCODE_TLV_API_LQ_SS_PARAMS);
1173
1174         /* Treat uninitialized rate scaling data same as non-existing. */
1175         if (!lq_sta) {
1176                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1177                 return;
1178         } else if (!lq_sta->pers.drv) {
1179                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1180                 return;
1181         }
1182
1183         /* This packet was aggregated but doesn't carry status info */
1184         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1185             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1186                 return;
1187
1188         rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1189
1190 #ifdef CONFIG_MAC80211_DEBUGFS
1191         /* Disable last tx check if we are debugging with fixed rate but
1192          * update tx stats */
1193         if (lq_sta->pers.dbg_fixed_rate) {
1194                 int index = tx_resp_rate.index;
1195                 enum rs_column column;
1196                 int attempts, success;
1197
1198                 column = rs_get_column_from_rate(&tx_resp_rate);
1199                 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1200                               "Can't map rate 0x%x to column",
1201                               tx_resp_hwrate))
1202                         return;
1203
1204                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1205                         attempts = info->status.ampdu_len;
1206                         success = info->status.ampdu_ack_len;
1207                 } else {
1208                         attempts = info->status.rates[0].count;
1209                         success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1210                 }
1211
1212                 lq_sta->pers.tx_stats[column][index].total += attempts;
1213                 lq_sta->pers.tx_stats[column][index].success += success;
1214
1215                 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1216                                tx_resp_hwrate, success, attempts);
1217                 return;
1218         }
1219 #endif
1220
1221         if (time_after(jiffies,
1222                        (unsigned long)(lq_sta->last_tx +
1223                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1224                 int t;
1225
1226                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1227                 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1228                         ieee80211_stop_tx_ba_session(sta, t);
1229
1230                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1231                 return;
1232         }
1233         lq_sta->last_tx = jiffies;
1234
1235         /* Ignore this Tx frame response if its initial rate doesn't match
1236          * that of latest Link Quality command.  There may be stragglers
1237          * from a previous Link Quality command, but we're no longer interested
1238          * in those; they're either from the "active" mode while we're trying
1239          * to check "search" mode, or a prior "search" mode after we've moved
1240          * to a new "search" mode (which might become the new "active" mode).
1241          */
1242         table = &lq_sta->lq;
1243         lq_hwrate = le32_to_cpu(table->rs_table[0]);
1244         rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1245
1246         /* Here we actually compare this rate to the latest LQ command */
1247         if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1248                 IWL_DEBUG_RATE(mvm,
1249                                "initial tx resp rate 0x%x does not match 0x%x\n",
1250                                tx_resp_hwrate, lq_hwrate);
1251
1252                 /*
1253                  * Since rates mis-match, the last LQ command may have failed.
1254                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1255                  * ... driver.
1256                  */
1257                 lq_sta->missed_rate_counter++;
1258                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1259                         lq_sta->missed_rate_counter = 0;
1260                         IWL_DEBUG_RATE(mvm,
1261                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1262                                        lq_sta->rs_state);
1263                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1264                 }
1265                 /* Regardless, ignore this status info for outdated rate */
1266                 return;
1267         } else
1268                 /* Rate did match, so reset the missed_rate_counter */
1269                 lq_sta->missed_rate_counter = 0;
1270
1271         if (!lq_sta->search_better_tbl) {
1272                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1273                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1274         } else {
1275                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1276                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1277         }
1278
1279         if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1280                 IWL_DEBUG_RATE(mvm,
1281                                "Neither active nor search matches tx rate\n");
1282                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1283                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1284                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1285                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1286                 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1287
1288                 /*
1289                  * no matching table found, let's by-pass the data collection
1290                  * and continue to perform rate scale to find the rate table
1291                  */
1292                 rs_stay_in_table(lq_sta, true);
1293                 goto done;
1294         }
1295
1296         /*
1297          * Updating the frame history depends on whether packets were
1298          * aggregated.
1299          *
1300          * For aggregation, all packets were transmitted at the same rate, the
1301          * first index into rate scale table.
1302          */
1303         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1304                 /* ampdu_ack_len = 0 marks no BA was received. In this case
1305                  * treat it as a single frame loss as we don't want the success
1306                  * ratio to dip too quickly because a BA wasn't received
1307                  */
1308                 if (info->status.ampdu_ack_len == 0)
1309                         info->status.ampdu_len = 1;
1310
1311                 rs_collect_tx_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1312                                    info->status.ampdu_len,
1313                                    info->status.ampdu_ack_len,
1314                                    reduced_txp);
1315
1316                 /* Update success/fail counts if not searching for new mode */
1317                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1318                         lq_sta->total_success += info->status.ampdu_ack_len;
1319                         lq_sta->total_failed += (info->status.ampdu_len -
1320                                         info->status.ampdu_ack_len);
1321                 }
1322         } else {
1323                 /* For legacy, update frame history with for each Tx retry. */
1324                 retries = info->status.rates[0].count - 1;
1325                 /* HW doesn't send more than 15 retries */
1326                 retries = min(retries, 15);
1327
1328                 /* The last transmission may have been successful */
1329                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1330                 /* Collect data for each rate used during failed TX attempts */
1331                 for (i = 0; i <= retries; ++i) {
1332                         lq_hwrate = le32_to_cpu(table->rs_table[i]);
1333                         rs_rate_from_ucode_rate(lq_hwrate, info->band,
1334                                                 &lq_rate);
1335                         /*
1336                          * Only collect stats if retried rate is in the same RS
1337                          * table as active/search.
1338                          */
1339                         if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1340                                 tmp_tbl = curr_tbl;
1341                         else if (rs_rate_column_match(&lq_rate,
1342                                                       &other_tbl->rate))
1343                                 tmp_tbl = other_tbl;
1344                         else
1345                                 continue;
1346
1347                         rs_collect_tx_data(mvm, lq_sta, tmp_tbl, lq_rate.index,
1348                                            1, i < retries ? 0 : legacy_success,
1349                                            reduced_txp);
1350                 }
1351
1352                 /* Update success/fail counts if not searching for new mode */
1353                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1354                         lq_sta->total_success += legacy_success;
1355                         lq_sta->total_failed += retries + (1 - legacy_success);
1356                 }
1357         }
1358         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1359         lq_sta->last_rate_n_flags = lq_hwrate;
1360         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1361 done:
1362         /* See if there's a better rate or modulation mode to try. */
1363         if (sta->supp_rates[info->band])
1364                 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1365 }
1366
1367 /*
1368  * mac80211 sends us Tx status
1369  */
1370 static void rs_mac80211_tx_status(void *mvm_r,
1371                                   struct ieee80211_supported_band *sband,
1372                                   struct ieee80211_sta *sta, void *priv_sta,
1373                                   struct sk_buff *skb)
1374 {
1375         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1376         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1377         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1378         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1379
1380         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1381                 return;
1382
1383         if (!ieee80211_is_data(hdr->frame_control) ||
1384             info->flags & IEEE80211_TX_CTL_NO_ACK)
1385                 return;
1386
1387         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1388 }
1389
1390 /*
1391  * Begin a period of staying with a selected modulation mode.
1392  * Set "stay_in_tbl" flag to prevent any mode switches.
1393  * Set frame tx success limits according to legacy vs. high-throughput,
1394  * and reset overall (spanning all rates) tx success history statistics.
1395  * These control how long we stay using same modulation mode before
1396  * searching for a new mode.
1397  */
1398 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1399                                  struct iwl_lq_sta *lq_sta)
1400 {
1401         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1402         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1403         if (is_legacy) {
1404                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1405                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1406                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1407         } else {
1408                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1409                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1410                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1411         }
1412         lq_sta->table_count = 0;
1413         lq_sta->total_failed = 0;
1414         lq_sta->total_success = 0;
1415         lq_sta->flush_timer = jiffies;
1416         lq_sta->visited_columns = 0;
1417 }
1418
1419 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1420 {
1421         if (rate_mask)
1422                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1423         return IWL_RATE_INVALID;
1424 }
1425
1426 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1427                                    const struct rs_tx_column *column)
1428 {
1429         switch (column->mode) {
1430         case RS_LEGACY:
1431                 return lq_sta->max_legacy_rate_idx;
1432         case RS_SISO:
1433                 return lq_sta->max_siso_rate_idx;
1434         case RS_MIMO2:
1435                 return lq_sta->max_mimo2_rate_idx;
1436         default:
1437                 WARN_ON_ONCE(1);
1438         }
1439
1440         return lq_sta->max_legacy_rate_idx;
1441 }
1442
1443 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1444                                             const struct rs_tx_column *column,
1445                                             u32 bw)
1446 {
1447         /* Used to choose among HT tables */
1448         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1449
1450         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1451                          column->mode != RS_SISO &&
1452                          column->mode != RS_MIMO2))
1453                 return expected_tpt_legacy;
1454
1455         /* Legacy rates have only one table */
1456         if (column->mode == RS_LEGACY)
1457                 return expected_tpt_legacy;
1458
1459         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1460         /* Choose among many HT tables depending on number of streams
1461          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1462          * status */
1463         if (column->mode == RS_SISO) {
1464                 switch (bw) {
1465                 case RATE_MCS_CHAN_WIDTH_20:
1466                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1467                         break;
1468                 case RATE_MCS_CHAN_WIDTH_40:
1469                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1470                         break;
1471                 case RATE_MCS_CHAN_WIDTH_80:
1472                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1473                         break;
1474                 default:
1475                         WARN_ON_ONCE(1);
1476                 }
1477         } else if (column->mode == RS_MIMO2) {
1478                 switch (bw) {
1479                 case RATE_MCS_CHAN_WIDTH_20:
1480                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1481                         break;
1482                 case RATE_MCS_CHAN_WIDTH_40:
1483                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1484                         break;
1485                 case RATE_MCS_CHAN_WIDTH_80:
1486                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1487                         break;
1488                 default:
1489                         WARN_ON_ONCE(1);
1490                 }
1491         } else {
1492                 WARN_ON_ONCE(1);
1493         }
1494
1495         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1496                 return ht_tbl_pointer[0];
1497         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1498                 return ht_tbl_pointer[1];
1499         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1500                 return ht_tbl_pointer[2];
1501         else                                            /* AGG+SGI */
1502                 return ht_tbl_pointer[3];
1503 }
1504
1505 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1506                                       struct iwl_scale_tbl_info *tbl)
1507 {
1508         struct rs_rate *rate = &tbl->rate;
1509         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1510
1511         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1512 }
1513
1514 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1515                             struct iwl_lq_sta *lq_sta,
1516                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1517                             unsigned long rate_mask, s8 index)
1518 {
1519         struct iwl_scale_tbl_info *active_tbl =
1520             &(lq_sta->lq_info[lq_sta->active_tbl]);
1521         s32 success_ratio = active_tbl->win[index].success_ratio;
1522         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1523         const u16 *tpt_tbl = tbl->expected_tpt;
1524         u16 high_low;
1525         u32 target_tpt;
1526         int rate_idx;
1527
1528         if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1529                 target_tpt = 100 * expected_current_tpt;
1530                 IWL_DEBUG_RATE(mvm,
1531                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1532                                success_ratio, target_tpt);
1533         } else {
1534                 target_tpt = lq_sta->last_tpt;
1535                 IWL_DEBUG_RATE(mvm,
1536                                "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1537                                success_ratio, target_tpt);
1538         }
1539
1540         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1541
1542         while (rate_idx != IWL_RATE_INVALID) {
1543                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1544                         break;
1545
1546                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1547                                                 tbl->rate.type);
1548
1549                 rate_idx = (high_low >> 8) & 0xff;
1550         }
1551
1552         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1553                        rate_idx, target_tpt,
1554                        rate_idx != IWL_RATE_INVALID ?
1555                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1556
1557         return rate_idx;
1558 }
1559
1560 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1561 {
1562         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1563                 return RATE_MCS_CHAN_WIDTH_80;
1564         else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1565                 return RATE_MCS_CHAN_WIDTH_40;
1566
1567         return RATE_MCS_CHAN_WIDTH_20;
1568 }
1569
1570 /*
1571  * Check whether we should continue using same modulation mode, or
1572  * begin search for a new mode, based on:
1573  * 1) # tx successes or failures while using this mode
1574  * 2) # times calling this function
1575  * 3) elapsed time in this mode (not used, for now)
1576  */
1577 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1578 {
1579         struct iwl_scale_tbl_info *tbl;
1580         int active_tbl;
1581         int flush_interval_passed = 0;
1582         struct iwl_mvm *mvm;
1583
1584         mvm = lq_sta->pers.drv;
1585         active_tbl = lq_sta->active_tbl;
1586
1587         tbl = &(lq_sta->lq_info[active_tbl]);
1588
1589         /* If we've been disallowing search, see if we should now allow it */
1590         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1591                 /* Elapsed time using current modulation mode */
1592                 if (lq_sta->flush_timer)
1593                         flush_interval_passed =
1594                                 time_after(jiffies,
1595                                            (unsigned long)(lq_sta->flush_timer +
1596                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1597
1598                 /*
1599                  * Check if we should allow search for new modulation mode.
1600                  * If many frames have failed or succeeded, or we've used
1601                  * this same modulation for a long time, allow search, and
1602                  * reset history stats that keep track of whether we should
1603                  * allow a new search.  Also (below) reset all bitmaps and
1604                  * stats in active history.
1605                  */
1606                 if (force_search ||
1607                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1608                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1609                     ((!lq_sta->search_better_tbl) &&
1610                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1611                         IWL_DEBUG_RATE(mvm,
1612                                        "LQ: stay is expired %d %d %d\n",
1613                                      lq_sta->total_failed,
1614                                      lq_sta->total_success,
1615                                      flush_interval_passed);
1616
1617                         /* Allow search for new mode */
1618                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1619                         IWL_DEBUG_RATE(mvm,
1620                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1621                         lq_sta->total_failed = 0;
1622                         lq_sta->total_success = 0;
1623                         lq_sta->flush_timer = 0;
1624                         /* mark the current column as visited */
1625                         lq_sta->visited_columns = BIT(tbl->column);
1626                 /*
1627                  * Else if we've used this modulation mode enough repetitions
1628                  * (regardless of elapsed time or success/failure), reset
1629                  * history bitmaps and rate-specific stats for all rates in
1630                  * active table.
1631                  */
1632                 } else {
1633                         lq_sta->table_count++;
1634                         if (lq_sta->table_count >=
1635                             lq_sta->table_count_limit) {
1636                                 lq_sta->table_count = 0;
1637
1638                                 IWL_DEBUG_RATE(mvm,
1639                                                "LQ: stay in table clear win\n");
1640                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1641                         }
1642                 }
1643
1644                 /* If transitioning to allow "search", reset all history
1645                  * bitmaps and stats in active table (this will become the new
1646                  * "search" table). */
1647                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1648                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1649                 }
1650         }
1651 }
1652
1653 /*
1654  * setup rate table in uCode
1655  */
1656 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1657                                struct ieee80211_sta *sta,
1658                                struct iwl_lq_sta *lq_sta,
1659                                struct iwl_scale_tbl_info *tbl)
1660 {
1661         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1662         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1663 }
1664
1665 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1666                               struct ieee80211_sta *sta,
1667                               struct iwl_lq_sta *lq_sta,
1668                               struct iwl_scale_tbl_info *tbl,
1669                               enum rs_action scale_action)
1670 {
1671         if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1672                 return false;
1673
1674         if (!is_vht_siso(&tbl->rate))
1675                 return false;
1676
1677         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1678             (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1679             (scale_action == RS_ACTION_DOWNSCALE)) {
1680                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1681                 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1682                 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1683                 goto tweaked;
1684         }
1685
1686         /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1687          * sustainable, i.e. we're past the test window. We can't go back
1688          * if MCS5 is just tested as this will happen always after switching
1689          * to 20Mhz MCS4 because the rate stats are cleared.
1690          */
1691         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1692             (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1693              (scale_action == RS_ACTION_STAY)) ||
1694              ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1695               (scale_action == RS_ACTION_UPSCALE)))) {
1696                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1697                 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1698                 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1699                 goto tweaked;
1700         }
1701
1702         return false;
1703
1704 tweaked:
1705         rs_set_expected_tpt_table(lq_sta, tbl);
1706         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1707         return true;
1708 }
1709
1710 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1711                                          struct iwl_lq_sta *lq_sta,
1712                                          struct ieee80211_sta *sta,
1713                                          struct iwl_scale_tbl_info *tbl)
1714 {
1715         int i, j, max_rate;
1716         enum rs_column next_col_id;
1717         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1718         const struct rs_tx_column *next_col;
1719         allow_column_func_t allow_func;
1720         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1721         const u16 *expected_tpt_tbl;
1722         u16 tpt, max_expected_tpt;
1723
1724         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1725                 next_col_id = curr_col->next_columns[i];
1726
1727                 if (next_col_id == RS_COLUMN_INVALID)
1728                         continue;
1729
1730                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1731                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1732                                        next_col_id);
1733                         continue;
1734                 }
1735
1736                 next_col = &rs_tx_columns[next_col_id];
1737
1738                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1739                         IWL_DEBUG_RATE(mvm,
1740                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1741                                        next_col_id, valid_ants, next_col->ant);
1742                         continue;
1743                 }
1744
1745                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1746                         allow_func = next_col->checks[j];
1747                         if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1748                                                       next_col))
1749                                 break;
1750                 }
1751
1752                 if (j != MAX_COLUMN_CHECKS) {
1753                         IWL_DEBUG_RATE(mvm,
1754                                        "Skip column %d: not allowed (check %d failed)\n",
1755                                        next_col_id, j);
1756
1757                         continue;
1758                 }
1759
1760                 tpt = lq_sta->last_tpt / 100;
1761                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1762                                                      rs_bw_from_sta_bw(sta));
1763                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1764                         continue;
1765
1766                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1767                 if (max_rate == IWL_RATE_INVALID) {
1768                         IWL_DEBUG_RATE(mvm,
1769                                        "Skip column %d: no rate is allowed in this column\n",
1770                                        next_col_id);
1771                         continue;
1772                 }
1773
1774                 max_expected_tpt = expected_tpt_tbl[max_rate];
1775                 if (tpt >= max_expected_tpt) {
1776                         IWL_DEBUG_RATE(mvm,
1777                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1778                                        next_col_id, max_expected_tpt, tpt);
1779                         continue;
1780                 }
1781
1782                 IWL_DEBUG_RATE(mvm,
1783                                "Found potential column %d. Max expected %d current %d\n",
1784                                next_col_id, max_expected_tpt, tpt);
1785                 break;
1786         }
1787
1788         if (i == MAX_NEXT_COLUMNS)
1789                 return RS_COLUMN_INVALID;
1790
1791         return next_col_id;
1792 }
1793
1794 static int rs_switch_to_column(struct iwl_mvm *mvm,
1795                                struct iwl_lq_sta *lq_sta,
1796                                struct ieee80211_sta *sta,
1797                                enum rs_column col_id)
1798 {
1799         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1800         struct iwl_scale_tbl_info *search_tbl =
1801                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1802         struct rs_rate *rate = &search_tbl->rate;
1803         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1804         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1805         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1806                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1807         unsigned long rate_mask = 0;
1808         u32 rate_idx = 0;
1809
1810         memcpy(search_tbl, tbl, sz);
1811
1812         rate->sgi = column->sgi;
1813         rate->ant = column->ant;
1814
1815         if (column->mode == RS_LEGACY) {
1816                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1817                         rate->type = LQ_LEGACY_A;
1818                 else
1819                         rate->type = LQ_LEGACY_G;
1820
1821                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1822                 rate->ldpc = false;
1823                 rate_mask = lq_sta->active_legacy_rate;
1824         } else if (column->mode == RS_SISO) {
1825                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1826                 rate_mask = lq_sta->active_siso_rate;
1827         } else if (column->mode == RS_MIMO2) {
1828                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1829                 rate_mask = lq_sta->active_mimo2_rate;
1830         } else {
1831                 WARN_ONCE(1, "Bad column mode");
1832         }
1833
1834         if (column->mode != RS_LEGACY) {
1835                 rate->bw = rs_bw_from_sta_bw(sta);
1836                 rate->ldpc = lq_sta->ldpc;
1837         }
1838
1839         search_tbl->column = col_id;
1840         rs_set_expected_tpt_table(lq_sta, search_tbl);
1841
1842         lq_sta->visited_columns |= BIT(col_id);
1843
1844         /* Get the best matching rate if we're changing modes. e.g.
1845          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1846          */
1847         if (curr_column->mode != column->mode) {
1848                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1849                                             rate_mask, rate->index);
1850
1851                 if ((rate_idx == IWL_RATE_INVALID) ||
1852                     !(BIT(rate_idx) & rate_mask)) {
1853                         IWL_DEBUG_RATE(mvm,
1854                                        "can not switch with index %d"
1855                                        " rate mask %lx\n",
1856                                        rate_idx, rate_mask);
1857
1858                         goto err;
1859                 }
1860
1861                 rate->index = rate_idx;
1862         }
1863
1864         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1865                        col_id, rate->index);
1866
1867         return 0;
1868
1869 err:
1870         rate->type = LQ_NONE;
1871         return -1;
1872 }
1873
1874 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1875                                          struct iwl_scale_tbl_info *tbl,
1876                                          s32 sr, int low, int high,
1877                                          int current_tpt,
1878                                          int low_tpt, int high_tpt)
1879 {
1880         enum rs_action action = RS_ACTION_STAY;
1881
1882         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1883             (current_tpt == 0)) {
1884                 IWL_DEBUG_RATE(mvm,
1885                                "Decrease rate because of low SR\n");
1886                 return RS_ACTION_DOWNSCALE;
1887         }
1888
1889         if ((low_tpt == IWL_INVALID_VALUE) &&
1890             (high_tpt == IWL_INVALID_VALUE) &&
1891             (high != IWL_RATE_INVALID)) {
1892                 IWL_DEBUG_RATE(mvm,
1893                                "No data about high/low rates. Increase rate\n");
1894                 return RS_ACTION_UPSCALE;
1895         }
1896
1897         if ((high_tpt == IWL_INVALID_VALUE) &&
1898             (high != IWL_RATE_INVALID) &&
1899             (low_tpt != IWL_INVALID_VALUE) &&
1900             (low_tpt < current_tpt)) {
1901                 IWL_DEBUG_RATE(mvm,
1902                                "No data about high rate and low rate is worse. Increase rate\n");
1903                 return RS_ACTION_UPSCALE;
1904         }
1905
1906         if ((high_tpt != IWL_INVALID_VALUE) &&
1907             (high_tpt > current_tpt)) {
1908                 IWL_DEBUG_RATE(mvm,
1909                                "Higher rate is better. Increate rate\n");
1910                 return RS_ACTION_UPSCALE;
1911         }
1912
1913         if ((low_tpt != IWL_INVALID_VALUE) &&
1914             (high_tpt != IWL_INVALID_VALUE) &&
1915             (low_tpt < current_tpt) &&
1916             (high_tpt < current_tpt)) {
1917                 IWL_DEBUG_RATE(mvm,
1918                                "Both high and low are worse. Maintain rate\n");
1919                 return RS_ACTION_STAY;
1920         }
1921
1922         if ((low_tpt != IWL_INVALID_VALUE) &&
1923             (low_tpt > current_tpt)) {
1924                 IWL_DEBUG_RATE(mvm,
1925                                "Lower rate is better\n");
1926                 action = RS_ACTION_DOWNSCALE;
1927                 goto out;
1928         }
1929
1930         if ((low_tpt == IWL_INVALID_VALUE) &&
1931             (low != IWL_RATE_INVALID)) {
1932                 IWL_DEBUG_RATE(mvm,
1933                                "No data about lower rate\n");
1934                 action = RS_ACTION_DOWNSCALE;
1935                 goto out;
1936         }
1937
1938         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1939
1940 out:
1941         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1942                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1943                         IWL_DEBUG_RATE(mvm,
1944                                        "SR is above NO DECREASE. Avoid downscale\n");
1945                         action = RS_ACTION_STAY;
1946                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1947                         IWL_DEBUG_RATE(mvm,
1948                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1949                         action = RS_ACTION_STAY;
1950                 } else {
1951                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1952                 }
1953         }
1954
1955         return action;
1956 }
1957
1958 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1959                           struct iwl_lq_sta *lq_sta)
1960 {
1961         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1962          * supports STBC of at least 1*SS
1963          */
1964         if (!lq_sta->stbc_capable)
1965                 return false;
1966
1967         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1968                 return false;
1969
1970         return true;
1971 }
1972
1973 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1974                                 int *weaker, int *stronger)
1975 {
1976         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1977         if (*weaker > TPC_MAX_REDUCTION)
1978                 *weaker = TPC_INVALID;
1979
1980         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1981         if (*stronger < 0)
1982                 *stronger = TPC_INVALID;
1983 }
1984
1985 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1986                            struct rs_rate *rate, enum ieee80211_band band)
1987 {
1988         int index = rate->index;
1989         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1990         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1991                                 !vif->bss_conf.ps);
1992
1993         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1994                        cam, sta_ps_disabled);
1995         /*
1996          * allow tpc only if power management is enabled, or bt coex
1997          * activity grade allows it and we are on 2.4Ghz.
1998          */
1999         if ((cam || sta_ps_disabled) &&
2000             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2001                 return false;
2002
2003         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2004         if (is_legacy(rate))
2005                 return index == IWL_RATE_54M_INDEX;
2006         if (is_ht(rate))
2007                 return index == IWL_RATE_MCS_7_INDEX;
2008         if (is_vht(rate))
2009                 return index == IWL_RATE_MCS_7_INDEX ||
2010                        index == IWL_RATE_MCS_8_INDEX ||
2011                        index == IWL_RATE_MCS_9_INDEX;
2012
2013         WARN_ON_ONCE(1);
2014         return false;
2015 }
2016
2017 enum tpc_action {
2018         TPC_ACTION_STAY,
2019         TPC_ACTION_DECREASE,
2020         TPC_ACTION_INCREASE,
2021         TPC_ACTION_NO_RESTIRCTION,
2022 };
2023
2024 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2025                                          s32 sr, int weak, int strong,
2026                                          int current_tpt,
2027                                          int weak_tpt, int strong_tpt)
2028 {
2029         /* stay until we have valid tpt */
2030         if (current_tpt == IWL_INVALID_VALUE) {
2031                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2032                 return TPC_ACTION_STAY;
2033         }
2034
2035         /* Too many failures, increase txp */
2036         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2037             current_tpt == 0) {
2038                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2039                 return TPC_ACTION_NO_RESTIRCTION;
2040         }
2041
2042         /* try decreasing first if applicable */
2043         if (weak != TPC_INVALID) {
2044                 if (weak_tpt == IWL_INVALID_VALUE &&
2045                     (strong_tpt == IWL_INVALID_VALUE ||
2046                      current_tpt >= strong_tpt)) {
2047                         IWL_DEBUG_RATE(mvm,
2048                                        "no weak txp measurement. decrease txp\n");
2049                         return TPC_ACTION_DECREASE;
2050                 }
2051
2052                 if (weak_tpt > current_tpt) {
2053                         IWL_DEBUG_RATE(mvm,
2054                                        "lower txp has better tpt. decrease txp\n");
2055                         return TPC_ACTION_DECREASE;
2056                 }
2057         }
2058
2059         /* next, increase if needed */
2060         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2061             strong != TPC_INVALID) {
2062                 if (weak_tpt == IWL_INVALID_VALUE &&
2063                     strong_tpt != IWL_INVALID_VALUE &&
2064                     current_tpt < strong_tpt) {
2065                         IWL_DEBUG_RATE(mvm,
2066                                        "higher txp has better tpt. increase txp\n");
2067                         return TPC_ACTION_INCREASE;
2068                 }
2069
2070                 if (weak_tpt < current_tpt &&
2071                     (strong_tpt == IWL_INVALID_VALUE ||
2072                      strong_tpt > current_tpt)) {
2073                         IWL_DEBUG_RATE(mvm,
2074                                        "lower txp has worse tpt. increase txp\n");
2075                         return TPC_ACTION_INCREASE;
2076                 }
2077         }
2078
2079         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2080         return TPC_ACTION_STAY;
2081 }
2082
2083 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2084                            struct ieee80211_sta *sta,
2085                            struct iwl_lq_sta *lq_sta,
2086                            struct iwl_scale_tbl_info *tbl)
2087 {
2088         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2089         struct ieee80211_vif *vif = mvm_sta->vif;
2090         struct ieee80211_chanctx_conf *chanctx_conf;
2091         enum ieee80211_band band;
2092         struct iwl_rate_scale_data *window;
2093         struct rs_rate *rate = &tbl->rate;
2094         enum tpc_action action;
2095         s32 sr;
2096         u8 cur = lq_sta->lq.reduced_tpc;
2097         int current_tpt;
2098         int weak, strong;
2099         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2100
2101 #ifdef CONFIG_MAC80211_DEBUGFS
2102         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2103                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2104                                lq_sta->pers.dbg_fixed_txp_reduction);
2105                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2106                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2107         }
2108 #endif
2109
2110         rcu_read_lock();
2111         chanctx_conf = rcu_dereference(vif->chanctx_conf);
2112         if (WARN_ON(!chanctx_conf))
2113                 band = IEEE80211_NUM_BANDS;
2114         else
2115                 band = chanctx_conf->def.chan->band;
2116         rcu_read_unlock();
2117
2118         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2119                 IWL_DEBUG_RATE(mvm,
2120                                "tpc is not allowed. remove txp restrictions\n");
2121                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2122                 return cur != TPC_NO_REDUCTION;
2123         }
2124
2125         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2126
2127         /* Collect measured throughputs for current and adjacent rates */
2128         window = tbl->tpc_win;
2129         sr = window[cur].success_ratio;
2130         current_tpt = window[cur].average_tpt;
2131         if (weak != TPC_INVALID)
2132                 weak_tpt = window[weak].average_tpt;
2133         if (strong != TPC_INVALID)
2134                 strong_tpt = window[strong].average_tpt;
2135
2136         IWL_DEBUG_RATE(mvm,
2137                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2138                        cur, current_tpt, sr, weak, strong,
2139                        weak_tpt, strong_tpt);
2140
2141         action = rs_get_tpc_action(mvm, sr, weak, strong,
2142                                    current_tpt, weak_tpt, strong_tpt);
2143
2144         /* override actions if we are on the edge */
2145         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2146                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2147                 action = TPC_ACTION_STAY;
2148         } else if (strong == TPC_INVALID &&
2149                    (action == TPC_ACTION_INCREASE ||
2150                     action == TPC_ACTION_NO_RESTIRCTION)) {
2151                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2152                 action = TPC_ACTION_STAY;
2153         }
2154
2155         switch (action) {
2156         case TPC_ACTION_DECREASE:
2157                 lq_sta->lq.reduced_tpc = weak;
2158                 return true;
2159         case TPC_ACTION_INCREASE:
2160                 lq_sta->lq.reduced_tpc = strong;
2161                 return true;
2162         case TPC_ACTION_NO_RESTIRCTION:
2163                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2164                 return true;
2165         case TPC_ACTION_STAY:
2166                 /* do nothing */
2167                 break;
2168         }
2169         return false;
2170 }
2171
2172 /*
2173  * Do rate scaling and search for new modulation mode.
2174  */
2175 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2176                                   struct ieee80211_sta *sta,
2177                                   struct iwl_lq_sta *lq_sta,
2178                                   int tid)
2179 {
2180         int low = IWL_RATE_INVALID;
2181         int high = IWL_RATE_INVALID;
2182         int index;
2183         struct iwl_rate_scale_data *window = NULL;
2184         int current_tpt = IWL_INVALID_VALUE;
2185         int low_tpt = IWL_INVALID_VALUE;
2186         int high_tpt = IWL_INVALID_VALUE;
2187         u32 fail_count;
2188         enum rs_action scale_action = RS_ACTION_STAY;
2189         u16 rate_mask;
2190         u8 update_lq = 0;
2191         struct iwl_scale_tbl_info *tbl, *tbl1;
2192         u8 active_tbl = 0;
2193         u8 done_search = 0;
2194         u16 high_low;
2195         s32 sr;
2196         u8 prev_agg = lq_sta->is_agg;
2197         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2198         struct iwl_mvm_tid_data *tid_data;
2199         struct rs_rate *rate;
2200
2201         lq_sta->is_agg = !!sta_priv->agg_tids;
2202
2203         /*
2204          * Select rate-scale / modulation-mode table to work with in
2205          * the rest of this function:  "search" if searching for better
2206          * modulation mode, or "active" if doing rate scaling within a mode.
2207          */
2208         if (!lq_sta->search_better_tbl)
2209                 active_tbl = lq_sta->active_tbl;
2210         else
2211                 active_tbl = 1 - lq_sta->active_tbl;
2212
2213         tbl = &(lq_sta->lq_info[active_tbl]);
2214         rate = &tbl->rate;
2215
2216         if (prev_agg != lq_sta->is_agg) {
2217                 IWL_DEBUG_RATE(mvm,
2218                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2219                                prev_agg, lq_sta->is_agg);
2220                 rs_set_expected_tpt_table(lq_sta, tbl);
2221                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2222         }
2223
2224         /* current tx rate */
2225         index = rate->index;
2226
2227         /* rates available for this association, and for modulation mode */
2228         rate_mask = rs_get_supported_rates(lq_sta, rate);
2229
2230         if (!(BIT(index) & rate_mask)) {
2231                 IWL_ERR(mvm, "Current Rate is not valid\n");
2232                 if (lq_sta->search_better_tbl) {
2233                         /* revert to active table if search table is not valid*/
2234                         rate->type = LQ_NONE;
2235                         lq_sta->search_better_tbl = 0;
2236                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2237                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2238                 }
2239                 return;
2240         }
2241
2242         /* Get expected throughput table and history window for current rate */
2243         if (!tbl->expected_tpt) {
2244                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2245                 return;
2246         }
2247
2248         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2249         window = &(tbl->win[index]);
2250
2251         /*
2252          * If there is not enough history to calculate actual average
2253          * throughput, keep analyzing results of more tx frames, without
2254          * changing rate or mode (bypass most of the rest of this function).
2255          * Set up new rate table in uCode only if old rate is not supported
2256          * in current association (use new rate found above).
2257          */
2258         fail_count = window->counter - window->success_counter;
2259         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2260             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2261                 IWL_DEBUG_RATE(mvm,
2262                                "%s: Test Window: succ %d total %d\n",
2263                                rs_pretty_rate(rate),
2264                                window->success_counter, window->counter);
2265
2266                 /* Can't calculate this yet; not enough history */
2267                 window->average_tpt = IWL_INVALID_VALUE;
2268
2269                 /* Should we stay with this modulation mode,
2270                  * or search for a new one? */
2271                 rs_stay_in_table(lq_sta, false);
2272
2273                 return;
2274         }
2275
2276         /* If we are searching for better modulation mode, check success. */
2277         if (lq_sta->search_better_tbl) {
2278                 /* If good success, continue using the "search" mode;
2279                  * no need to send new link quality command, since we're
2280                  * continuing to use the setup that we've been trying. */
2281                 if (window->average_tpt > lq_sta->last_tpt) {
2282                         IWL_DEBUG_RATE(mvm,
2283                                        "SWITCHING TO NEW TABLE SR: %d "
2284                                        "cur-tpt %d old-tpt %d\n",
2285                                        window->success_ratio,
2286                                        window->average_tpt,
2287                                        lq_sta->last_tpt);
2288
2289                         /* Swap tables; "search" becomes "active" */
2290                         lq_sta->active_tbl = active_tbl;
2291                         current_tpt = window->average_tpt;
2292                 /* Else poor success; go back to mode in "active" table */
2293                 } else {
2294                         IWL_DEBUG_RATE(mvm,
2295                                        "GOING BACK TO THE OLD TABLE: SR %d "
2296                                        "cur-tpt %d old-tpt %d\n",
2297                                        window->success_ratio,
2298                                        window->average_tpt,
2299                                        lq_sta->last_tpt);
2300
2301                         /* Nullify "search" table */
2302                         rate->type = LQ_NONE;
2303
2304                         /* Revert to "active" table */
2305                         active_tbl = lq_sta->active_tbl;
2306                         tbl = &(lq_sta->lq_info[active_tbl]);
2307
2308                         /* Revert to "active" rate and throughput info */
2309                         index = tbl->rate.index;
2310                         current_tpt = lq_sta->last_tpt;
2311
2312                         /* Need to set up a new rate table in uCode */
2313                         update_lq = 1;
2314                 }
2315
2316                 /* Either way, we've made a decision; modulation mode
2317                  * search is done, allow rate adjustment next time. */
2318                 lq_sta->search_better_tbl = 0;
2319                 done_search = 1;        /* Don't switch modes below! */
2320                 goto lq_update;
2321         }
2322
2323         /* (Else) not in search of better modulation mode, try for better
2324          * starting rate, while staying in this mode. */
2325         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2326         low = high_low & 0xff;
2327         high = (high_low >> 8) & 0xff;
2328
2329         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2330
2331         sr = window->success_ratio;
2332
2333         /* Collect measured throughputs for current and adjacent rates */
2334         current_tpt = window->average_tpt;
2335         if (low != IWL_RATE_INVALID)
2336                 low_tpt = tbl->win[low].average_tpt;
2337         if (high != IWL_RATE_INVALID)
2338                 high_tpt = tbl->win[high].average_tpt;
2339
2340         IWL_DEBUG_RATE(mvm,
2341                        "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2342                        rs_pretty_rate(rate), current_tpt, sr,
2343                        low, high, low_tpt, high_tpt);
2344
2345         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2346                                           current_tpt, low_tpt, high_tpt);
2347
2348         /* Force a search in case BT doesn't like us being in MIMO */
2349         if (is_mimo(rate) &&
2350             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2351                 IWL_DEBUG_RATE(mvm,
2352                                "BT Coex forbids MIMO. Search for new config\n");
2353                 rs_stay_in_table(lq_sta, true);
2354                 goto lq_update;
2355         }
2356
2357         switch (scale_action) {
2358         case RS_ACTION_DOWNSCALE:
2359                 /* Decrease starting rate, update uCode's rate table */
2360                 if (low != IWL_RATE_INVALID) {
2361                         update_lq = 1;
2362                         index = low;
2363                 } else {
2364                         IWL_DEBUG_RATE(mvm,
2365                                        "At the bottom rate. Can't decrease\n");
2366                 }
2367
2368                 break;
2369         case RS_ACTION_UPSCALE:
2370                 /* Increase starting rate, update uCode's rate table */
2371                 if (high != IWL_RATE_INVALID) {
2372                         update_lq = 1;
2373                         index = high;
2374                 } else {
2375                         IWL_DEBUG_RATE(mvm,
2376                                        "At the top rate. Can't increase\n");
2377                 }
2378
2379                 break;
2380         case RS_ACTION_STAY:
2381                 /* No change */
2382                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2383                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2384                 break;
2385         default:
2386                 break;
2387         }
2388
2389 lq_update:
2390         /* Replace uCode's rate table for the destination station. */
2391         if (update_lq) {
2392                 tbl->rate.index = index;
2393                 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2394                         rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2395                 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2396         }
2397
2398         rs_stay_in_table(lq_sta, false);
2399
2400         /*
2401          * Search for new modulation mode if we're:
2402          * 1)  Not changing rates right now
2403          * 2)  Not just finishing up a search
2404          * 3)  Allowing a new search
2405          */
2406         if (!update_lq && !done_search &&
2407             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2408             && window->counter) {
2409                 enum rs_column next_column;
2410
2411                 /* Save current throughput to compare with "search" throughput*/
2412                 lq_sta->last_tpt = current_tpt;
2413
2414                 IWL_DEBUG_RATE(mvm,
2415                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2416                                update_lq, done_search, lq_sta->rs_state,
2417                                window->counter);
2418
2419                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2420                 if (next_column != RS_COLUMN_INVALID) {
2421                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2422                                                       next_column);
2423                         if (!ret)
2424                                 lq_sta->search_better_tbl = 1;
2425                 } else {
2426                         IWL_DEBUG_RATE(mvm,
2427                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2428                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2429                 }
2430
2431                 /* If new "search" mode was selected, set up in uCode table */
2432                 if (lq_sta->search_better_tbl) {
2433                         /* Access the "search" table, clear its history. */
2434                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2435                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2436
2437                         /* Use new "search" start rate */
2438                         index = tbl->rate.index;
2439
2440                         rs_dump_rate(mvm, &tbl->rate,
2441                                      "Switch to SEARCH TABLE:");
2442                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2443                 } else {
2444                         done_search = 1;
2445                 }
2446         }
2447
2448         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2449                 /* If the "active" (non-search) mode was legacy,
2450                  * and we've tried switching antennas,
2451                  * but we haven't been able to try HT modes (not available),
2452                  * stay with best antenna legacy modulation for a while
2453                  * before next round of mode comparisons. */
2454                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2455                 if (is_legacy(&tbl1->rate)) {
2456                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2457
2458                         if (tid != IWL_MAX_TID_COUNT) {
2459                                 tid_data = &sta_priv->tid_data[tid];
2460                                 if (tid_data->state != IWL_AGG_OFF) {
2461                                         IWL_DEBUG_RATE(mvm,
2462                                                        "Stop aggregation on tid %d\n",
2463                                                        tid);
2464                                         ieee80211_stop_tx_ba_session(sta, tid);
2465                                 }
2466                         }
2467                         rs_set_stay_in_table(mvm, 1, lq_sta);
2468                 } else {
2469                 /* If we're in an HT mode, and all 3 mode switch actions
2470                  * have been tried and compared, stay in this best modulation
2471                  * mode for a while before next round of mode comparisons. */
2472                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2473                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2474                             (tid != IWL_MAX_TID_COUNT)) {
2475                                 tid_data = &sta_priv->tid_data[tid];
2476                                 if (tid_data->state == IWL_AGG_OFF) {
2477                                         IWL_DEBUG_RATE(mvm,
2478                                                        "try to aggregate tid %d\n",
2479                                                        tid);
2480                                         rs_tl_turn_on_agg(mvm, tid,
2481                                                           lq_sta, sta);
2482                                 }
2483                         }
2484                         rs_set_stay_in_table(mvm, 0, lq_sta);
2485                 }
2486         }
2487 }
2488
2489 struct rs_init_rate_info {
2490         s8 rssi;
2491         u8 rate_idx;
2492 };
2493
2494 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2495         { -60, IWL_RATE_54M_INDEX },
2496         { -64, IWL_RATE_48M_INDEX },
2497         { -68, IWL_RATE_36M_INDEX },
2498         { -80, IWL_RATE_24M_INDEX },
2499         { -84, IWL_RATE_18M_INDEX },
2500         { -85, IWL_RATE_12M_INDEX },
2501         { -86, IWL_RATE_11M_INDEX },
2502         { -88, IWL_RATE_5M_INDEX  },
2503         { -90, IWL_RATE_2M_INDEX  },
2504         { S8_MIN, IWL_RATE_1M_INDEX },
2505 };
2506
2507 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2508         { -60, IWL_RATE_54M_INDEX },
2509         { -64, IWL_RATE_48M_INDEX },
2510         { -72, IWL_RATE_36M_INDEX },
2511         { -80, IWL_RATE_24M_INDEX },
2512         { -84, IWL_RATE_18M_INDEX },
2513         { -85, IWL_RATE_12M_INDEX },
2514         { -87, IWL_RATE_9M_INDEX  },
2515         { S8_MIN, IWL_RATE_6M_INDEX },
2516 };
2517
2518 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2519         { -60, IWL_RATE_MCS_7_INDEX },
2520         { -64, IWL_RATE_MCS_6_INDEX },
2521         { -68, IWL_RATE_MCS_5_INDEX },
2522         { -72, IWL_RATE_MCS_4_INDEX },
2523         { -80, IWL_RATE_MCS_3_INDEX },
2524         { -84, IWL_RATE_MCS_2_INDEX },
2525         { -85, IWL_RATE_MCS_1_INDEX },
2526         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2527 };
2528
2529 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2530         { -60, IWL_RATE_MCS_8_INDEX },
2531         { -64, IWL_RATE_MCS_7_INDEX },
2532         { -68, IWL_RATE_MCS_6_INDEX },
2533         { -72, IWL_RATE_MCS_5_INDEX },
2534         { -80, IWL_RATE_MCS_4_INDEX },
2535         { -84, IWL_RATE_MCS_3_INDEX },
2536         { -85, IWL_RATE_MCS_2_INDEX },
2537         { -87, IWL_RATE_MCS_1_INDEX },
2538         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2539 };
2540
2541 static const struct rs_init_rate_info rs_optimal_rates_vht_40_80mhz[] = {
2542         { -60, IWL_RATE_MCS_9_INDEX },
2543         { -64, IWL_RATE_MCS_8_INDEX },
2544         { -68, IWL_RATE_MCS_7_INDEX },
2545         { -72, IWL_RATE_MCS_6_INDEX },
2546         { -80, IWL_RATE_MCS_5_INDEX },
2547         { -84, IWL_RATE_MCS_4_INDEX },
2548         { -85, IWL_RATE_MCS_3_INDEX },
2549         { -87, IWL_RATE_MCS_2_INDEX },
2550         { -88, IWL_RATE_MCS_1_INDEX },
2551         { S8_MIN, IWL_RATE_MCS_0_INDEX },
2552 };
2553
2554 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2555
2556 /* Init the optimal rate based on STA caps
2557  * This combined with rssi is used to report the last tx rate
2558  * to userspace when we haven't transmitted enough frames.
2559  */
2560 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2561                                  struct ieee80211_sta *sta,
2562                                  struct iwl_lq_sta *lq_sta)
2563 {
2564         struct rs_rate *rate = &lq_sta->optimal_rate;
2565
2566         if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2567                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2568         else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2569                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2570         else if (lq_sta->band == IEEE80211_BAND_5GHZ)
2571                 rate->type = LQ_LEGACY_A;
2572         else
2573                 rate->type = LQ_LEGACY_G;
2574
2575         rate->bw = rs_bw_from_sta_bw(sta);
2576         rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2577
2578         /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2579
2580         if (is_mimo(rate)) {
2581                 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2582         } else if (is_siso(rate)) {
2583                 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2584         } else {
2585                 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2586
2587                 if (lq_sta->band == IEEE80211_BAND_5GHZ) {
2588                         lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2589                         lq_sta->optimal_nentries =
2590                                 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2591                 } else {
2592                         lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2593                         lq_sta->optimal_nentries =
2594                                 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2595                 }
2596         }
2597
2598         if (is_vht(rate)) {
2599                 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2600                         lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2601                         lq_sta->optimal_nentries =
2602                                 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2603                 } else {
2604                         lq_sta->optimal_rates = rs_optimal_rates_vht_40_80mhz;
2605                         lq_sta->optimal_nentries =
2606                                 ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz);
2607                 }
2608         } else if (is_ht(rate)) {
2609                 lq_sta->optimal_rates = rs_optimal_rates_ht;
2610                 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2611         }
2612 }
2613
2614 /* Compute the optimal rate index based on RSSI */
2615 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2616                                            struct iwl_lq_sta *lq_sta)
2617 {
2618         struct rs_rate *rate = &lq_sta->optimal_rate;
2619         int i;
2620
2621         rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2622                                      BITS_PER_LONG);
2623
2624         for (i = 0; i < lq_sta->optimal_nentries; i++) {
2625                 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2626
2627                 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2628                     (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2629                         rate->index = rate_idx;
2630                         break;
2631                 }
2632         }
2633
2634         return rate;
2635 }
2636
2637 /* Choose an initial legacy rate and antenna to use based on the RSSI
2638  * of last Rx
2639  */
2640 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2641                                 struct ieee80211_sta *sta,
2642                                 struct iwl_lq_sta *lq_sta,
2643                                 enum ieee80211_band band,
2644                                 struct rs_rate *rate)
2645 {
2646         int i, nentries;
2647         unsigned long active_rate;
2648         s8 best_rssi = S8_MIN;
2649         u8 best_ant = ANT_NONE;
2650         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2651         const struct rs_init_rate_info *initial_rates;
2652
2653         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2654                 if (!(lq_sta->pers.chains & BIT(i)))
2655                         continue;
2656
2657                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2658                         best_rssi = lq_sta->pers.chain_signal[i];
2659                         best_ant = BIT(i);
2660                 }
2661         }
2662
2663         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2664                        rs_pretty_ant(best_ant), best_rssi);
2665
2666         if (best_ant != ANT_A && best_ant != ANT_B)
2667                 rate->ant = first_antenna(valid_tx_ant);
2668         else
2669                 rate->ant = best_ant;
2670
2671         rate->sgi = false;
2672         rate->ldpc = false;
2673         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2674
2675         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2676                                      BITS_PER_LONG);
2677
2678         if (band == IEEE80211_BAND_5GHZ) {
2679                 rate->type = LQ_LEGACY_A;
2680                 initial_rates = rs_optimal_rates_5ghz_legacy;
2681                 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2682         } else {
2683                 rate->type = LQ_LEGACY_G;
2684                 initial_rates = rs_optimal_rates_24ghz_legacy;
2685                 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2686         }
2687
2688         if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2689                 goto out;
2690
2691         /* Start from a higher rate if the corresponding debug capability
2692          * is enabled. The rate is chosen according to AP capabilities.
2693          * In case of VHT/HT when the rssi is low fallback to the case of
2694          * legacy rates.
2695          */
2696         if (sta->vht_cap.vht_supported &&
2697             best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2698                 if (sta->bandwidth >= IEEE80211_STA_RX_BW_40) {
2699                         initial_rates = rs_optimal_rates_vht_40_80mhz;
2700                         nentries = ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz);
2701                         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
2702                                 rate->bw = RATE_MCS_CHAN_WIDTH_80;
2703                         else
2704                                 rate->bw = RATE_MCS_CHAN_WIDTH_40;
2705                 } else if (sta->bandwidth == IEEE80211_STA_RX_BW_20) {
2706                         initial_rates = rs_optimal_rates_vht_20mhz;
2707                         nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2708                         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2709                 } else {
2710                         IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2711                         goto out;
2712                 }
2713                 active_rate = lq_sta->active_siso_rate;
2714                 rate->type = LQ_VHT_SISO;
2715         } else if (sta->ht_cap.ht_supported &&
2716                    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2717                 initial_rates = rs_optimal_rates_ht;
2718                 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2719                 active_rate = lq_sta->active_siso_rate;
2720                 rate->type = LQ_HT_SISO;
2721         } else {
2722                 active_rate = lq_sta->active_legacy_rate;
2723         }
2724
2725         for (i = 0; i < nentries; i++) {
2726                 int rate_idx = initial_rates[i].rate_idx;
2727
2728                 if ((best_rssi >= initial_rates[i].rssi) &&
2729                     (BIT(rate_idx) & active_rate)) {
2730                         rate->index = rate_idx;
2731                         break;
2732                 }
2733         }
2734
2735 out:
2736         rs_dump_rate(mvm, rate, "INITIAL");
2737 }
2738
2739 /* Save info about RSSI of last Rx */
2740 void rs_update_last_rssi(struct iwl_mvm *mvm,
2741                          struct iwl_lq_sta *lq_sta,
2742                          struct ieee80211_rx_status *rx_status)
2743 {
2744         int i;
2745
2746         lq_sta->pers.chains = rx_status->chains;
2747         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2748         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2749         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2750         lq_sta->pers.last_rssi = S8_MIN;
2751
2752         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2753                 if (!(lq_sta->pers.chains & BIT(i)))
2754                         continue;
2755
2756                 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2757                         lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2758         }
2759 }
2760
2761 /**
2762  * rs_initialize_lq - Initialize a station's hardware rate table
2763  *
2764  * The uCode's station table contains a table of fallback rates
2765  * for automatic fallback during transmission.
2766  *
2767  * NOTE: This sets up a default set of values.  These will be replaced later
2768  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2769  *       rc80211_simple.
2770  *
2771  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2772  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2773  *       which requires station table entry to exist).
2774  */
2775 static void rs_initialize_lq(struct iwl_mvm *mvm,
2776                              struct ieee80211_sta *sta,
2777                              struct iwl_lq_sta *lq_sta,
2778                              enum ieee80211_band band,
2779                              bool init)
2780 {
2781         struct iwl_scale_tbl_info *tbl;
2782         struct rs_rate *rate;
2783         u8 active_tbl = 0;
2784
2785         if (!sta || !lq_sta)
2786                 return;
2787
2788         if (!lq_sta->search_better_tbl)
2789                 active_tbl = lq_sta->active_tbl;
2790         else
2791                 active_tbl = 1 - lq_sta->active_tbl;
2792
2793         tbl = &(lq_sta->lq_info[active_tbl]);
2794         rate = &tbl->rate;
2795
2796         rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2797         rs_init_optimal_rate(mvm, sta, lq_sta);
2798
2799         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2800         tbl->column = rs_get_column_from_rate(rate);
2801
2802         rs_set_expected_tpt_table(lq_sta, tbl);
2803         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2804         /* TODO restore station should remember the lq cmd */
2805         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2806 }
2807
2808 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2809                         struct ieee80211_tx_rate_control *txrc)
2810 {
2811         struct sk_buff *skb = txrc->skb;
2812         struct iwl_op_mode *op_mode __maybe_unused =
2813                         (struct iwl_op_mode *)mvm_r;
2814         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2815         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2816         struct iwl_lq_sta *lq_sta = mvm_sta;
2817         struct rs_rate *optimal_rate;
2818         u32 last_ucode_rate;
2819
2820         if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2821                 /* if vif isn't initialized mvm doesn't know about
2822                  * this station, so don't do anything with the it
2823                  */
2824                 sta = NULL;
2825                 mvm_sta = NULL;
2826         }
2827
2828         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2829
2830         /* Treat uninitialized rate scaling data same as non-existing. */
2831         if (lq_sta && !lq_sta->pers.drv) {
2832                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2833                 mvm_sta = NULL;
2834         }
2835
2836         /* Send management frames and NO_ACK data using lowest rate. */
2837         if (rate_control_send_low(sta, mvm_sta, txrc))
2838                 return;
2839
2840         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2841                                   info->band, &info->control.rates[0]);
2842         info->control.rates[0].count = 1;
2843
2844         /* Report the optimal rate based on rssi and STA caps if we haven't
2845          * converged yet (too little traffic) or exploring other modulations
2846          */
2847         if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2848                 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2849                 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2850                                                           optimal_rate);
2851                 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2852                                           &txrc->reported_rate);
2853         }
2854 }
2855
2856 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2857                           gfp_t gfp)
2858 {
2859         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2860         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2861         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2862         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2863
2864         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2865
2866         lq_sta->pers.drv = mvm;
2867 #ifdef CONFIG_MAC80211_DEBUGFS
2868         lq_sta->pers.dbg_fixed_rate = 0;
2869         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2870         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2871 #endif
2872         lq_sta->pers.chains = 0;
2873         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2874         lq_sta->pers.last_rssi = S8_MIN;
2875
2876         return &sta_priv->lq_sta;
2877 }
2878
2879 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2880                                        int nss)
2881 {
2882         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2883                 (0x3 << (2 * (nss - 1)));
2884         rx_mcs >>= (2 * (nss - 1));
2885
2886         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2887                 return IWL_RATE_MCS_7_INDEX;
2888         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2889                 return IWL_RATE_MCS_8_INDEX;
2890         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2891                 return IWL_RATE_MCS_9_INDEX;
2892
2893         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2894         return -1;
2895 }
2896
2897 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2898                                      struct ieee80211_sta_vht_cap *vht_cap,
2899                                      struct iwl_lq_sta *lq_sta)
2900 {
2901         int i;
2902         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2903
2904         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2905                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2906                         if (i == IWL_RATE_9M_INDEX)
2907                                 continue;
2908
2909                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2910                         if (i == IWL_RATE_MCS_9_INDEX &&
2911                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2912                                 continue;
2913
2914                         lq_sta->active_siso_rate |= BIT(i);
2915                 }
2916         }
2917
2918         if (sta->rx_nss < 2)
2919                 return;
2920
2921         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2922         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2923                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2924                         if (i == IWL_RATE_9M_INDEX)
2925                                 continue;
2926
2927                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2928                         if (i == IWL_RATE_MCS_9_INDEX &&
2929                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2930                                 continue;
2931
2932                         lq_sta->active_mimo2_rate |= BIT(i);
2933                 }
2934         }
2935 }
2936
2937 static void rs_ht_init(struct iwl_mvm *mvm,
2938                        struct ieee80211_sta *sta,
2939                        struct iwl_lq_sta *lq_sta,
2940                        struct ieee80211_sta_ht_cap *ht_cap)
2941 {
2942         /* active_siso_rate mask includes 9 MBits (bit 5),
2943          * and CCK (bits 0-3), supp_rates[] does not;
2944          * shift to convert format, force 9 MBits off.
2945          */
2946         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2947         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2948         lq_sta->active_siso_rate &= ~((u16)0x2);
2949         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2950
2951         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2952         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2953         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2954         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2955
2956         if (mvm->cfg->ht_params->ldpc &&
2957             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2958                 lq_sta->ldpc = true;
2959
2960         if (mvm->cfg->ht_params->stbc &&
2961             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2962             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2963                 lq_sta->stbc_capable = true;
2964
2965         lq_sta->is_vht = false;
2966 }
2967
2968 static void rs_vht_init(struct iwl_mvm *mvm,
2969                         struct ieee80211_sta *sta,
2970                         struct iwl_lq_sta *lq_sta,
2971                         struct ieee80211_sta_vht_cap *vht_cap)
2972 {
2973         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2974
2975         if (mvm->cfg->ht_params->ldpc &&
2976             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2977                 lq_sta->ldpc = true;
2978
2979         if (mvm->cfg->ht_params->stbc &&
2980             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2981             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2982                 lq_sta->stbc_capable = true;
2983
2984         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2985             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2986             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2987                 lq_sta->bfer_capable = true;
2988
2989         lq_sta->is_vht = true;
2990 }
2991
2992 #ifdef CONFIG_IWLWIFI_DEBUGFS
2993 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2994 {
2995         spin_lock_bh(&mvm->drv_stats_lock);
2996         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2997         spin_unlock_bh(&mvm->drv_stats_lock);
2998 }
2999
3000 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3001 {
3002         u8 nss = 0, mcs = 0;
3003
3004         spin_lock(&mvm->drv_stats_lock);
3005
3006         if (agg)
3007                 mvm->drv_rx_stats.agg_frames++;
3008
3009         mvm->drv_rx_stats.success_frames++;
3010
3011         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3012         case RATE_MCS_CHAN_WIDTH_20:
3013                 mvm->drv_rx_stats.bw_20_frames++;
3014                 break;
3015         case RATE_MCS_CHAN_WIDTH_40:
3016                 mvm->drv_rx_stats.bw_40_frames++;
3017                 break;
3018         case RATE_MCS_CHAN_WIDTH_80:
3019                 mvm->drv_rx_stats.bw_80_frames++;
3020                 break;
3021         default:
3022                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3023         }
3024
3025         if (rate & RATE_MCS_HT_MSK) {
3026                 mvm->drv_rx_stats.ht_frames++;
3027                 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
3028                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3029         } else if (rate & RATE_MCS_VHT_MSK) {
3030                 mvm->drv_rx_stats.vht_frames++;
3031                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3032                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3033                        RATE_VHT_MCS_NSS_POS) + 1;
3034         } else {
3035                 mvm->drv_rx_stats.legacy_frames++;
3036         }
3037
3038         if (nss == 1)
3039                 mvm->drv_rx_stats.siso_frames++;
3040         else if (nss == 2)
3041                 mvm->drv_rx_stats.mimo2_frames++;
3042
3043         if (rate & RATE_MCS_SGI_MSK)
3044                 mvm->drv_rx_stats.sgi_frames++;
3045         else
3046                 mvm->drv_rx_stats.ngi_frames++;
3047
3048         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3049         mvm->drv_rx_stats.last_frame_idx =
3050                 (mvm->drv_rx_stats.last_frame_idx + 1) %
3051                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3052
3053         spin_unlock(&mvm->drv_stats_lock);
3054 }
3055 #endif
3056
3057 /*
3058  * Called after adding a new station to initialize rate scaling
3059  */
3060 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3061                           enum ieee80211_band band, bool init)
3062 {
3063         int i, j;
3064         struct ieee80211_hw *hw = mvm->hw;
3065         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3066         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3067         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
3068         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
3069         struct ieee80211_supported_band *sband;
3070         unsigned long supp; /* must be unsigned long for for_each_set_bit */
3071
3072         /* clear all non-persistent lq data */
3073         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3074
3075         sband = hw->wiphy->bands[band];
3076
3077         lq_sta->lq.sta_id = sta_priv->sta_id;
3078
3079         for (j = 0; j < LQ_SIZE; j++)
3080                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3081
3082         lq_sta->flush_timer = 0;
3083         lq_sta->last_tx = jiffies;
3084
3085         IWL_DEBUG_RATE(mvm,
3086                        "LQ: *** rate scale station global init for station %d ***\n",
3087                        sta_priv->sta_id);
3088         /* TODO: what is a good starting rate for STA? About middle? Maybe not
3089          * the lowest or the highest rate.. Could consider using RSSI from
3090          * previous packets? Need to have IEEE 802.1X auth succeed immediately
3091          * after assoc.. */
3092
3093         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3094         lq_sta->band = sband->band;
3095         /*
3096          * active legacy rates as per supported rates bitmap
3097          */
3098         supp = sta->supp_rates[sband->band];
3099         lq_sta->active_legacy_rate = 0;
3100         for_each_set_bit(i, &supp, BITS_PER_LONG)
3101                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3102
3103         /* TODO: should probably account for rx_highest for both HT/VHT */
3104         if (!vht_cap || !vht_cap->vht_supported)
3105                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3106         else
3107                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3108
3109         lq_sta->max_legacy_rate_idx =
3110                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3111         lq_sta->max_siso_rate_idx =
3112                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3113         lq_sta->max_mimo2_rate_idx =
3114                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3115
3116         IWL_DEBUG_RATE(mvm,
3117                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3118                        lq_sta->active_legacy_rate,
3119                        lq_sta->active_siso_rate,
3120                        lq_sta->active_mimo2_rate,
3121                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3122                        lq_sta->bfer_capable);
3123         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3124                        lq_sta->max_legacy_rate_idx,
3125                        lq_sta->max_siso_rate_idx,
3126                        lq_sta->max_mimo2_rate_idx);
3127
3128         /* These values will be overridden later */
3129         lq_sta->lq.single_stream_ant_msk =
3130                 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3131         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3132
3133         /* as default allow aggregation for all tids */
3134         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3135         lq_sta->is_agg = 0;
3136 #ifdef CONFIG_IWLWIFI_DEBUGFS
3137         iwl_mvm_reset_frame_stats(mvm);
3138 #endif
3139         rs_initialize_lq(mvm, sta, lq_sta, band, init);
3140 }
3141
3142 static void rs_rate_update(void *mvm_r,
3143                            struct ieee80211_supported_band *sband,
3144                            struct cfg80211_chan_def *chandef,
3145                            struct ieee80211_sta *sta, void *priv_sta,
3146                            u32 changed)
3147 {
3148         u8 tid;
3149         struct iwl_op_mode *op_mode  =
3150                         (struct iwl_op_mode *)mvm_r;
3151         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3152
3153         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3154                 return;
3155
3156         /* Stop any ongoing aggregations as rs starts off assuming no agg */
3157         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3158                 ieee80211_stop_tx_ba_session(sta, tid);
3159
3160         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3161 }
3162
3163 #ifdef CONFIG_MAC80211_DEBUGFS
3164 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3165                                             struct iwl_lq_cmd *lq_cmd,
3166                                             enum ieee80211_band band,
3167                                             u32 ucode_rate)
3168 {
3169         struct rs_rate rate;
3170         int i;
3171         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3172         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3173         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3174
3175         for (i = 0; i < num_rates; i++)
3176                 lq_cmd->rs_table[i] = ucode_rate_le32;
3177
3178         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
3179
3180         if (is_mimo(&rate))
3181                 lq_cmd->mimo_delim = num_rates - 1;
3182         else
3183                 lq_cmd->mimo_delim = 0;
3184
3185         lq_cmd->reduced_tpc = 0;
3186
3187         if (num_of_ant(ant) == 1)
3188                 lq_cmd->single_stream_ant_msk = ant;
3189
3190         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3191 }
3192 #endif /* CONFIG_MAC80211_DEBUGFS */
3193
3194 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3195                                      struct iwl_lq_sta *lq_sta,
3196                                      struct rs_rate *rate,
3197                                      __le32 *rs_table, int *rs_table_index,
3198                                      int num_rates, int num_retries,
3199                                      u8 valid_tx_ant, bool toggle_ant)
3200 {
3201         int i, j;
3202         __le32 ucode_rate;
3203         bool bottom_reached = false;
3204         int prev_rate_idx = rate->index;
3205         int end = LINK_QUAL_MAX_RETRY_NUM;
3206         int index = *rs_table_index;
3207
3208         for (i = 0; i < num_rates && index < end; i++) {
3209                 for (j = 0; j < num_retries && index < end; j++, index++) {
3210                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3211                                                                          rate));
3212                         rs_table[index] = ucode_rate;
3213                         if (toggle_ant)
3214                                 rs_toggle_antenna(valid_tx_ant, rate);
3215                 }
3216
3217                 prev_rate_idx = rate->index;
3218                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3219                 if (bottom_reached && !is_legacy(rate))
3220                         break;
3221         }
3222
3223         if (!bottom_reached && !is_legacy(rate))
3224                 rate->index = prev_rate_idx;
3225
3226         *rs_table_index = index;
3227 }
3228
3229 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3230  * column the rate table should look like this:
3231  *
3232  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3233  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3234  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3235  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3236  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3237  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3238  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3239  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3240  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3241  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3242  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3243  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3244  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3245  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3246  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3247  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3248  */
3249 static void rs_build_rates_table(struct iwl_mvm *mvm,
3250                                  struct ieee80211_sta *sta,
3251                                  struct iwl_lq_sta *lq_sta,
3252                                  const struct rs_rate *initial_rate)
3253 {
3254         struct rs_rate rate;
3255         int num_rates, num_retries, index = 0;
3256         u8 valid_tx_ant = 0;
3257         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3258         bool toggle_ant = false;
3259
3260         memcpy(&rate, initial_rate, sizeof(rate));
3261
3262         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3263
3264         /* TODO: remove old API when min FW API hits 14 */
3265         if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3266             rs_stbc_allow(mvm, sta, lq_sta))
3267                 rate.stbc = true;
3268
3269         if (is_siso(&rate)) {
3270                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3271                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3272         } else if (is_mimo(&rate)) {
3273                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3274                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3275         } else {
3276                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3277                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3278                 toggle_ant = true;
3279         }
3280
3281         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3282                                  num_rates, num_retries, valid_tx_ant,
3283                                  toggle_ant);
3284
3285         rs_get_lower_rate_down_column(lq_sta, &rate);
3286
3287         if (is_siso(&rate)) {
3288                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3289                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3290                 lq_cmd->mimo_delim = index;
3291         } else if (is_legacy(&rate)) {
3292                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3293                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3294         } else {
3295                 WARN_ON_ONCE(1);
3296         }
3297
3298         toggle_ant = true;
3299
3300         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3301                                  num_rates, num_retries, valid_tx_ant,
3302                                  toggle_ant);
3303
3304         rs_get_lower_rate_down_column(lq_sta, &rate);
3305
3306         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3307         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3308
3309         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3310                                  num_rates, num_retries, valid_tx_ant,
3311                                  toggle_ant);
3312
3313 }
3314
3315 struct rs_bfer_active_iter_data {
3316         struct ieee80211_sta *exclude_sta;
3317         struct iwl_mvm_sta *bfer_mvmsta;
3318 };
3319
3320 static void rs_bfer_active_iter(void *_data,
3321                                 struct ieee80211_sta *sta)
3322 {
3323         struct rs_bfer_active_iter_data *data = _data;
3324         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3325         struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3326         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3327
3328         if (sta == data->exclude_sta)
3329                 return;
3330
3331         /* The current sta has BFER allowed */
3332         if (ss_params & LQ_SS_BFER_ALLOWED) {
3333                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3334
3335                 data->bfer_mvmsta = mvmsta;
3336         }
3337 }
3338
3339 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3340 {
3341         int prio = -1;
3342         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3343
3344         switch (viftype) {
3345         case NL80211_IFTYPE_AP:
3346         case NL80211_IFTYPE_P2P_GO:
3347                 prio = 3;
3348                 break;
3349         case NL80211_IFTYPE_P2P_CLIENT:
3350                 prio = 2;
3351                 break;
3352         case NL80211_IFTYPE_STATION:
3353                 prio = 1;
3354                 break;
3355         default:
3356                 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3357                 prio = -1;
3358         }
3359
3360         return prio;
3361 }
3362
3363 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3364 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3365                                 struct iwl_mvm_sta *sta2)
3366 {
3367         int prio1 = rs_bfer_priority(sta1);
3368         int prio2 = rs_bfer_priority(sta2);
3369
3370         if (prio1 > prio2)
3371                 return 1;
3372         if (prio1 < prio2)
3373                 return -1;
3374         return 0;
3375 }
3376
3377 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3378                                 struct ieee80211_sta *sta,
3379                                 struct iwl_lq_sta *lq_sta,
3380                                 const struct rs_rate *initial_rate)
3381 {
3382         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3383         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3384         struct rs_bfer_active_iter_data data = {
3385                 .exclude_sta = sta,
3386                 .bfer_mvmsta = NULL,
3387         };
3388         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3389         u32 ss_params = LQ_SS_PARAMS_VALID;
3390
3391         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3392                 goto out;
3393
3394 #ifdef CONFIG_MAC80211_DEBUGFS
3395         /* Check if forcing the decision is configured.
3396          * Note that SISO is forced by not allowing STBC or BFER
3397          */
3398         if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3399                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3400         else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3401                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3402
3403         if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3404                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3405                                lq_sta->pers.ss_force);
3406                 goto out;
3407         }
3408 #endif
3409
3410         if (lq_sta->stbc_capable)
3411                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3412
3413         if (!lq_sta->bfer_capable)
3414                 goto out;
3415
3416         ieee80211_iterate_stations_atomic(mvm->hw,
3417                                           rs_bfer_active_iter,
3418                                           &data);
3419         bfer_mvmsta = data.bfer_mvmsta;
3420
3421         /* This code is safe as it doesn't run concurrently for different
3422          * stations. This is guaranteed by the fact that calls to
3423          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3424          */
3425         if (!bfer_mvmsta) {
3426                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3427
3428                 ss_params |= LQ_SS_BFER_ALLOWED;
3429                 goto out;
3430         }
3431
3432         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3433                        bfer_mvmsta->sta_id);
3434
3435         /* Disallow BFER on another STA if active and we're a higher priority */
3436         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3437                 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3438                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3439
3440                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3441                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3442                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3443
3444                 ss_params |= LQ_SS_BFER_ALLOWED;
3445                 IWL_DEBUG_RATE(mvm,
3446                                "Lower priority BFER sta found (%d). Switch BFER\n",
3447                                bfer_mvmsta->sta_id);
3448         }
3449 out:
3450         lq_cmd->ss_params = cpu_to_le32(ss_params);
3451 }
3452
3453 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3454                            struct ieee80211_sta *sta,
3455                            struct iwl_lq_sta *lq_sta,
3456                            const struct rs_rate *initial_rate)
3457 {
3458         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3459         struct iwl_mvm_sta *mvmsta;
3460         struct iwl_mvm_vif *mvmvif;
3461
3462         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3463         lq_cmd->agg_time_limit =
3464                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3465
3466 #ifdef CONFIG_MAC80211_DEBUGFS
3467         if (lq_sta->pers.dbg_fixed_rate) {
3468                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3469                                                 lq_sta->band,
3470                                                 lq_sta->pers.dbg_fixed_rate);
3471                 return;
3472         }
3473 #endif
3474         if (WARN_ON_ONCE(!sta || !initial_rate))
3475                 return;
3476
3477         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3478
3479         if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3480                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3481
3482         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3483         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3484
3485         if (num_of_ant(initial_rate->ant) == 1)
3486                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3487
3488         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3489
3490         /*
3491          * In case of low latency, tell the firmware to leave a frame in the
3492          * Tx Fifo so that it can start a transaction in the same TxOP. This
3493          * basically allows the firmware to send bursts.
3494          */
3495         if (iwl_mvm_vif_low_latency(mvmvif))
3496                 lq_cmd->agg_frame_cnt_limit--;
3497
3498         if (mvmsta->vif->p2p)
3499                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3500
3501         lq_cmd->agg_time_limit =
3502                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3503 }
3504
3505 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3506 {
3507         return hw->priv;
3508 }
3509 /* rate scale requires free function to be implemented */
3510 static void rs_free(void *mvm_rate)
3511 {
3512         return;
3513 }
3514
3515 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3516                         void *mvm_sta)
3517 {
3518         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3519         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3520
3521         IWL_DEBUG_RATE(mvm, "enter\n");
3522         IWL_DEBUG_RATE(mvm, "leave\n");
3523 }
3524
3525 #ifdef CONFIG_MAC80211_DEBUGFS
3526 int rs_pretty_print_rate(char *buf, const u32 rate)
3527 {
3528
3529         char *type, *bw;
3530         u8 mcs = 0, nss = 0;
3531         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3532
3533         if (!(rate & RATE_MCS_HT_MSK) &&
3534             !(rate & RATE_MCS_VHT_MSK)) {
3535                 int index = iwl_hwrate_to_plcp_idx(rate);
3536
3537                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3538                                rs_pretty_ant(ant),
3539                                index == IWL_RATE_INVALID ? "BAD" :
3540                                iwl_rate_mcs[index].mbps);
3541         }
3542
3543         if (rate & RATE_MCS_VHT_MSK) {
3544                 type = "VHT";
3545                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3546                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3547                        >> RATE_VHT_MCS_NSS_POS) + 1;
3548         } else if (rate & RATE_MCS_HT_MSK) {
3549                 type = "HT";
3550                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3551         } else {
3552                 type = "Unknown"; /* shouldn't happen */
3553         }
3554
3555         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3556         case RATE_MCS_CHAN_WIDTH_20:
3557                 bw = "20Mhz";
3558                 break;
3559         case RATE_MCS_CHAN_WIDTH_40:
3560                 bw = "40Mhz";
3561                 break;
3562         case RATE_MCS_CHAN_WIDTH_80:
3563                 bw = "80Mhz";
3564                 break;
3565         case RATE_MCS_CHAN_WIDTH_160:
3566                 bw = "160Mhz";
3567                 break;
3568         default:
3569                 bw = "BAD BW";
3570         }
3571
3572         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3573                        type, rs_pretty_ant(ant), bw, mcs, nss,
3574                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3575                        (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3576                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3577                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3578                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3579 }
3580
3581 /**
3582  * Program the device to use fixed rate for frame transmit
3583  * This is for debugging/testing only
3584  * once the device start use fixed rate, we need to reload the module
3585  * to being back the normal operation.
3586  */
3587 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3588                                 struct iwl_lq_sta *lq_sta)
3589 {
3590         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3591         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3592         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3593
3594         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3595                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3596
3597         if (lq_sta->pers.dbg_fixed_rate) {
3598                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3599                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3600         }
3601 }
3602
3603 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3604                         const char __user *user_buf, size_t count, loff_t *ppos)
3605 {
3606         struct iwl_lq_sta *lq_sta = file->private_data;
3607         struct iwl_mvm *mvm;
3608         char buf[64];
3609         size_t buf_size;
3610         u32 parsed_rate;
3611
3612         mvm = lq_sta->pers.drv;
3613         memset(buf, 0, sizeof(buf));
3614         buf_size = min(count, sizeof(buf) -  1);
3615         if (copy_from_user(buf, user_buf, buf_size))
3616                 return -EFAULT;
3617
3618         if (sscanf(buf, "%x", &parsed_rate) == 1)
3619                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3620         else
3621                 lq_sta->pers.dbg_fixed_rate = 0;
3622
3623         rs_program_fix_rate(mvm, lq_sta);
3624
3625         return count;
3626 }
3627
3628 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3629                         char __user *user_buf, size_t count, loff_t *ppos)
3630 {
3631         char *buff;
3632         int desc = 0;
3633         int i = 0;
3634         ssize_t ret;
3635
3636         struct iwl_lq_sta *lq_sta = file->private_data;
3637         struct iwl_mvm *mvm;
3638         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3639         struct rs_rate *rate = &tbl->rate;
3640         u32 ss_params;
3641         mvm = lq_sta->pers.drv;
3642         buff = kmalloc(2048, GFP_KERNEL);
3643         if (!buff)
3644                 return -ENOMEM;
3645
3646         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3647         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3648                         lq_sta->total_failed, lq_sta->total_success,
3649                         lq_sta->active_legacy_rate);
3650         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3651                         lq_sta->pers.dbg_fixed_rate);
3652         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3653             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3654             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3655             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3656         desc += sprintf(buff+desc, "lq type %s\n",
3657                         (is_legacy(rate)) ? "legacy" :
3658                         is_vht(rate) ? "VHT" : "HT");
3659         if (!is_legacy(rate)) {
3660                 desc += sprintf(buff + desc, " %s",
3661                    (is_siso(rate)) ? "SISO" : "MIMO2");
3662                 desc += sprintf(buff + desc, " %s",
3663                                 (is_ht20(rate)) ? "20MHz" :
3664                                 (is_ht40(rate)) ? "40MHz" :
3665                                 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3666                 desc += sprintf(buff + desc, " %s %s %s\n",
3667                                 (rate->sgi) ? "SGI" : "NGI",
3668                                 (rate->ldpc) ? "LDPC" : "BCC",
3669                                 (lq_sta->is_agg) ? "AGG on" : "");
3670         }
3671         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3672                         lq_sta->last_rate_n_flags);
3673         desc += sprintf(buff+desc,
3674                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3675                         lq_sta->lq.flags,
3676                         lq_sta->lq.mimo_delim,
3677                         lq_sta->lq.single_stream_ant_msk,
3678                         lq_sta->lq.dual_stream_ant_msk);
3679
3680         desc += sprintf(buff+desc,
3681                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3682                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3683                         lq_sta->lq.agg_disable_start_th,
3684                         lq_sta->lq.agg_frame_cnt_limit);
3685
3686         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3687         ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3688         desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3689                         (ss_params & LQ_SS_PARAMS_VALID) ?
3690                         "VALID" : "INVALID",
3691                         (ss_params & LQ_SS_BFER_ALLOWED) ?
3692                         ", BFER" : "",
3693                         (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3694                         ", STBC" : "",
3695                         (ss_params & LQ_SS_FORCE) ?
3696                         ", FORCE" : "");
3697         desc += sprintf(buff+desc,
3698                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3699                         lq_sta->lq.initial_rate_index[0],
3700                         lq_sta->lq.initial_rate_index[1],
3701                         lq_sta->lq.initial_rate_index[2],
3702                         lq_sta->lq.initial_rate_index[3]);
3703
3704         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3705                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3706
3707                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3708                 desc += rs_pretty_print_rate(buff+desc, r);
3709         }
3710
3711         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3712         kfree(buff);
3713         return ret;
3714 }
3715
3716 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3717         .write = rs_sta_dbgfs_scale_table_write,
3718         .read = rs_sta_dbgfs_scale_table_read,
3719         .open = simple_open,
3720         .llseek = default_llseek,
3721 };
3722 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3723                         char __user *user_buf, size_t count, loff_t *ppos)
3724 {
3725         char *buff;
3726         int desc = 0;
3727         int i, j;
3728         ssize_t ret;
3729         struct iwl_scale_tbl_info *tbl;
3730         struct rs_rate *rate;
3731         struct iwl_lq_sta *lq_sta = file->private_data;
3732
3733         buff = kmalloc(1024, GFP_KERNEL);
3734         if (!buff)
3735                 return -ENOMEM;
3736
3737         for (i = 0; i < LQ_SIZE; i++) {
3738                 tbl = &(lq_sta->lq_info[i]);
3739                 rate = &tbl->rate;
3740                 desc += sprintf(buff+desc,
3741                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3742                                 "index=%d\n",
3743                                 lq_sta->active_tbl == i ? "*" : "x",
3744                                 rate->type,
3745                                 rate->sgi,
3746                                 is_ht20(rate) ? "20Mhz" :
3747                                 is_ht40(rate) ? "40Mhz" :
3748                                 is_ht80(rate) ? "80Mhz" : "ERR",
3749                                 rate->index);
3750                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3751                         desc += sprintf(buff+desc,
3752                                 "counter=%d success=%d %%=%d\n",
3753                                 tbl->win[j].counter,
3754                                 tbl->win[j].success_counter,
3755                                 tbl->win[j].success_ratio);
3756                 }
3757         }
3758         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3759         kfree(buff);
3760         return ret;
3761 }
3762
3763 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3764         .read = rs_sta_dbgfs_stats_table_read,
3765         .open = simple_open,
3766         .llseek = default_llseek,
3767 };
3768
3769 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3770                                               char __user *user_buf,
3771                                               size_t count, loff_t *ppos)
3772 {
3773         static const char * const column_name[] = {
3774                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3775                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3776                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3777                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3778                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3779                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3780                 [RS_COLUMN_MIMO2] = "MIMO2",
3781                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3782         };
3783
3784         static const char * const rate_name[] = {
3785                 [IWL_RATE_1M_INDEX] = "1M",
3786                 [IWL_RATE_2M_INDEX] = "2M",
3787                 [IWL_RATE_5M_INDEX] = "5.5M",
3788                 [IWL_RATE_11M_INDEX] = "11M",
3789                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3790                 [IWL_RATE_9M_INDEX] = "9M",
3791                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3792                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3793                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3794                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3795                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3796                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3797                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3798                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3799                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3800         };
3801
3802         char *buff, *pos, *endpos;
3803         int col, rate;
3804         ssize_t ret;
3805         struct iwl_lq_sta *lq_sta = file->private_data;
3806         struct rs_rate_stats *stats;
3807         static const size_t bufsz = 1024;
3808
3809         buff = kmalloc(bufsz, GFP_KERNEL);
3810         if (!buff)
3811                 return -ENOMEM;
3812
3813         pos = buff;
3814         endpos = pos + bufsz;
3815
3816         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3817         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3818                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3819         pos += scnprintf(pos, endpos - pos, "\n");
3820
3821         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3822                 pos += scnprintf(pos, endpos - pos,
3823                                  "%s,", column_name[col]);
3824
3825                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3826                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3827                         pos += scnprintf(pos, endpos - pos,
3828                                          "%llu/%llu,",
3829                                          stats->success,
3830                                          stats->total);
3831                 }
3832                 pos += scnprintf(pos, endpos - pos, "\n");
3833         }
3834
3835         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3836         kfree(buff);
3837         return ret;
3838 }
3839
3840 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3841                                                const char __user *user_buf,
3842                                                size_t count, loff_t *ppos)
3843 {
3844         struct iwl_lq_sta *lq_sta = file->private_data;
3845         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3846
3847         return count;
3848 }
3849
3850 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3851         .read = rs_sta_dbgfs_drv_tx_stats_read,
3852         .write = rs_sta_dbgfs_drv_tx_stats_write,
3853         .open = simple_open,
3854         .llseek = default_llseek,
3855 };
3856
3857 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3858                                        char __user *user_buf,
3859                                        size_t count, loff_t *ppos)
3860 {
3861         struct iwl_lq_sta *lq_sta = file->private_data;
3862         char buf[12];
3863         int bufsz = sizeof(buf);
3864         int pos = 0;
3865         static const char * const ss_force_name[] = {
3866                 [RS_SS_FORCE_NONE] = "none",
3867                 [RS_SS_FORCE_STBC] = "stbc",
3868                 [RS_SS_FORCE_BFER] = "bfer",
3869                 [RS_SS_FORCE_SISO] = "siso",
3870         };
3871
3872         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3873                          ss_force_name[lq_sta->pers.ss_force]);
3874         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3875 }
3876
3877 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3878                                         size_t count, loff_t *ppos)
3879 {
3880         struct iwl_mvm *mvm = lq_sta->pers.drv;
3881         int ret = 0;
3882
3883         if (!strncmp("none", buf, 4)) {
3884                 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3885         } else if (!strncmp("siso", buf, 4)) {
3886                 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3887         } else if (!strncmp("stbc", buf, 4)) {
3888                 if (lq_sta->stbc_capable) {
3889                         lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3890                 } else {
3891                         IWL_ERR(mvm,
3892                                 "can't force STBC. peer doesn't support\n");
3893                         ret = -EINVAL;
3894                 }
3895         } else if (!strncmp("bfer", buf, 4)) {
3896                 if (lq_sta->bfer_capable) {
3897                         lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3898                 } else {
3899                         IWL_ERR(mvm,
3900                                 "can't force BFER. peer doesn't support\n");
3901                         ret = -EINVAL;
3902                 }
3903         } else {
3904                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3905                 ret = -EINVAL;
3906         }
3907         return ret ?: count;
3908 }
3909
3910 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3911         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3912 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
3913                 if (!debugfs_create_file(#name, mode, parent, lq_sta,   \
3914                                          &iwl_dbgfs_##name##_ops))      \
3915                         goto err;                                       \
3916         } while (0)
3917
3918 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3919
3920 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
3921 {
3922         struct iwl_lq_sta *lq_sta = priv_sta;
3923         struct iwl_mvm_sta *mvmsta;
3924
3925         mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3926
3927         if (!mvmsta->vif)
3928                 return;
3929
3930         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3931                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
3932         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3933                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
3934         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3935                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3936         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3937                           &lq_sta->tx_agg_tid_en);
3938         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3939                           &lq_sta->pers.dbg_fixed_txp_reduction);
3940
3941         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3942         return;
3943 err:
3944         IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3945 }
3946
3947 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3948 {
3949 }
3950 #endif
3951
3952 /*
3953  * Initialization of rate scaling information is done by driver after
3954  * the station is added. Since mac80211 calls this function before a
3955  * station is added we ignore it.
3956  */
3957 static void rs_rate_init_stub(void *mvm_r,
3958                               struct ieee80211_supported_band *sband,
3959                               struct cfg80211_chan_def *chandef,
3960                               struct ieee80211_sta *sta, void *mvm_sta)
3961 {
3962 }
3963
3964 static const struct rate_control_ops rs_mvm_ops = {
3965         .name = RS_NAME,
3966         .tx_status = rs_mac80211_tx_status,
3967         .get_rate = rs_get_rate,
3968         .rate_init = rs_rate_init_stub,
3969         .alloc = rs_alloc,
3970         .free = rs_free,
3971         .alloc_sta = rs_alloc_sta,
3972         .free_sta = rs_free_sta,
3973         .rate_update = rs_rate_update,
3974 #ifdef CONFIG_MAC80211_DEBUGFS
3975         .add_sta_debugfs = rs_add_debugfs,
3976         .remove_sta_debugfs = rs_remove_debugfs,
3977 #endif
3978 };
3979
3980 int iwl_mvm_rate_control_register(void)
3981 {
3982         return ieee80211_rate_control_register(&rs_mvm_ops);
3983 }
3984
3985 void iwl_mvm_rate_control_unregister(void)
3986 {
3987         ieee80211_rate_control_unregister(&rs_mvm_ops);
3988 }
3989
3990 /**
3991  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3992  * Tx protection, according to this request and previous requests,
3993  * and send the LQ command.
3994  * @mvmsta: The station
3995  * @enable: Enable Tx protection?
3996  */
3997 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3998                           bool enable)
3999 {
4000         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
4001
4002         lockdep_assert_held(&mvm->mutex);
4003
4004         if (enable) {
4005                 if (mvmsta->tx_protection == 0)
4006                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
4007                 mvmsta->tx_protection++;
4008         } else {
4009                 mvmsta->tx_protection--;
4010                 if (mvmsta->tx_protection == 0)
4011                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4012         }
4013
4014         return iwl_mvm_send_lq_cmd(mvm, lq, false);
4015 }