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