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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
   4  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
   5  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  * The full GNU General Public License is included in this distribution in the
  21  * file called LICENSE.
  22  *
  23  * Contact Information:
  24  *  Intel Linux Wireless <linuxwifi@intel.com>
  25  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26  *
  27  *****************************************************************************/
  28 #include <linux/kernel.h>
  29 #include <linux/skbuff.h>
  30 #include <linux/slab.h>
  31 #include <net/mac80211.h>
  32
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/delay.h>
  36
  37 #include <linux/workqueue.h>
  38 #include "rs.h"
  39 #include "fw-api.h"
  40 #include "sta.h"
  41 #include "iwl-op-mode.h"
  42 #include "mvm.h"
  43 #include "debugfs.h"
  44
  45 #define RS_NAME "iwl-mvm-rs"
  46
  47 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  48
  49 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
  50  * Use this macro when dealing with thresholds consts set as a percentage
  51  */
  52 #define RS_PERCENT(x) (128 * x)
  53
  54 static u8 rs_ht_to_legacy[] = {
  55         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  56         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  57         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  58         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  59         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  60         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  61         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  62         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  63         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  64         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  65 };
  66
  67 static const u8 ant_toggle_lookup[] = {
  68         [ANT_NONE] = ANT_NONE,
  69         [ANT_A] = ANT_B,
  70         [ANT_B] = ANT_C,
  71         [ANT_AB] = ANT_BC,
  72         [ANT_C] = ANT_A,
  73         [ANT_AC] = ANT_AB,
  74         [ANT_BC] = ANT_AC,
  75         [ANT_ABC] = ANT_ABC,
  76 };
  77
  78 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  79         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  80                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  81                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  82                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  83                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  84                                     IWL_RATE_##rp##M_INDEX,           \
  85                                     IWL_RATE_##rn##M_INDEX }
  86
  87 #define IWL_DECLARE_MCS_RATE(s)                                           \
  88         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
  89                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
  90                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
  91                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
  92                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
  93                                        IWL_RATE_INVM_INDEX,               \
  94                                        IWL_RATE_INVM_INDEX }
  95
  96 /*
  97  * Parameter order:
  98  *   rate, ht rate, prev rate, next rate
  99  *
 100  * If there isn't a valid next or previous rate then INV is used which
 101  * maps to IWL_RATE_INVALID
 102  *
 103  */
 104 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 105         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 106         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 107         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 108         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 109         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 110         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 111         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 112         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 113         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 114         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 115         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 116         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 117         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 118         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 119         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 120 };
 121
 122 enum rs_action {
 123         RS_ACTION_STAY = 0,
 124         RS_ACTION_DOWNSCALE = -1,
 125         RS_ACTION_UPSCALE = 1,
 126 };
 127
 128 enum rs_column_mode {
 129         RS_INVALID = 0,
 130         RS_LEGACY,
 131         RS_SISO,
 132         RS_MIMO2,
 133 };
 134
 135 #define MAX_NEXT_COLUMNS 7
 136 #define MAX_COLUMN_CHECKS 3
 137
 138 struct rs_tx_column;
 139
 140 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 141                                      struct ieee80211_sta *sta,
 142                                      struct rs_rate *rate,
 143                                      const struct rs_tx_column *next_col);
 144
 145 struct rs_tx_column {
 146         enum rs_column_mode mode;
 147         u8 ant;
 148         bool sgi;
 149         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 150         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 151 };
 152
 153 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 154                          struct rs_rate *rate,
 155                          const struct rs_tx_column *next_col)
 156 {
 157         return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
 158 }
 159
 160 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 161                           struct rs_rate *rate,
 162                           const struct rs_tx_column *next_col)
 163 {
 164         if (!sta->ht_cap.ht_supported)
 165                 return false;
 166
 167         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 168                 return false;
 169
 170         if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
 171                 return false;
 172
 173         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 174                 return false;
 175
 176         if (mvm->nvm_data->sku_cap_mimo_disabled)
 177                 return false;
 178
 179         return true;
 180 }
 181
 182 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 183                           struct rs_rate *rate,
 184                           const struct rs_tx_column *next_col)
 185 {
 186         if (!sta->ht_cap.ht_supported)
 187                 return false;
 188
 189         return true;
 190 }
 191
 192 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 193                          struct rs_rate *rate,
 194                          const struct rs_tx_column *next_col)
 195 {
 196         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 197         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 198
 199         if (is_ht20(rate) && (ht_cap->cap &
 200                              IEEE80211_HT_CAP_SGI_20))
 201                 return true;
 202         if (is_ht40(rate) && (ht_cap->cap &
 203                              IEEE80211_HT_CAP_SGI_40))
 204                 return true;
 205         if (is_ht80(rate) && (vht_cap->cap &
 206                              IEEE80211_VHT_CAP_SHORT_GI_80))
 207                 return true;
 208         if (is_ht160(rate) && (vht_cap->cap &
 209                              IEEE80211_VHT_CAP_SHORT_GI_160))
 210                 return true;
 211
 212         return false;
 213 }
 214
 215 static const struct rs_tx_column rs_tx_columns[] = {
 216         [RS_COLUMN_LEGACY_ANT_A] = {
 217                 .mode = RS_LEGACY,
 218                 .ant = ANT_A,
 219                 .next_columns = {
 220                         RS_COLUMN_LEGACY_ANT_B,
 221                         RS_COLUMN_SISO_ANT_A,
 222                         RS_COLUMN_MIMO2,
 223                         RS_COLUMN_INVALID,
 224                         RS_COLUMN_INVALID,
 225                         RS_COLUMN_INVALID,
 226                         RS_COLUMN_INVALID,
 227                 },
 228                 .checks = {
 229                         rs_ant_allow,
 230                 },
 231         },
 232         [RS_COLUMN_LEGACY_ANT_B] = {
 233                 .mode = RS_LEGACY,
 234                 .ant = ANT_B,
 235                 .next_columns = {
 236                         RS_COLUMN_LEGACY_ANT_A,
 237                         RS_COLUMN_SISO_ANT_B,
 238                         RS_COLUMN_MIMO2,
 239                         RS_COLUMN_INVALID,
 240                         RS_COLUMN_INVALID,
 241                         RS_COLUMN_INVALID,
 242                         RS_COLUMN_INVALID,
 243                 },
 244                 .checks = {
 245                         rs_ant_allow,
 246                 },
 247         },
 248         [RS_COLUMN_SISO_ANT_A] = {
 249                 .mode = RS_SISO,
 250                 .ant = ANT_A,
 251                 .next_columns = {
 252                         RS_COLUMN_SISO_ANT_B,
 253                         RS_COLUMN_MIMO2,
 254                         RS_COLUMN_SISO_ANT_A_SGI,
 255                         RS_COLUMN_LEGACY_ANT_A,
 256                         RS_COLUMN_LEGACY_ANT_B,
 257                         RS_COLUMN_INVALID,
 258                         RS_COLUMN_INVALID,
 259                 },
 260                 .checks = {
 261                         rs_siso_allow,
 262                         rs_ant_allow,
 263                 },
 264         },
 265         [RS_COLUMN_SISO_ANT_B] = {
 266                 .mode = RS_SISO,
 267                 .ant = ANT_B,
 268                 .next_columns = {
 269                         RS_COLUMN_SISO_ANT_A,
 270                         RS_COLUMN_MIMO2,
 271                         RS_COLUMN_SISO_ANT_B_SGI,
 272                         RS_COLUMN_LEGACY_ANT_A,
 273                         RS_COLUMN_LEGACY_ANT_B,
 274                         RS_COLUMN_INVALID,
 275                         RS_COLUMN_INVALID,
 276                 },
 277                 .checks = {
 278                         rs_siso_allow,
 279                         rs_ant_allow,
 280                 },
 281         },
 282         [RS_COLUMN_SISO_ANT_A_SGI] = {
 283                 .mode = RS_SISO,
 284                 .ant = ANT_A,
 285                 .sgi = true,
 286                 .next_columns = {
 287                         RS_COLUMN_SISO_ANT_B_SGI,
 288                         RS_COLUMN_MIMO2_SGI,
 289                         RS_COLUMN_SISO_ANT_A,
 290                         RS_COLUMN_LEGACY_ANT_A,
 291                         RS_COLUMN_LEGACY_ANT_B,
 292                         RS_COLUMN_INVALID,
 293                         RS_COLUMN_INVALID,
 294                 },
 295                 .checks = {
 296                         rs_siso_allow,
 297                         rs_ant_allow,
 298                         rs_sgi_allow,
 299                 },
 300         },
 301         [RS_COLUMN_SISO_ANT_B_SGI] = {
 302                 .mode = RS_SISO,
 303                 .ant = ANT_B,
 304                 .sgi = true,
 305                 .next_columns = {
 306                         RS_COLUMN_SISO_ANT_A_SGI,
 307                         RS_COLUMN_MIMO2_SGI,
 308                         RS_COLUMN_SISO_ANT_B,
 309                         RS_COLUMN_LEGACY_ANT_A,
 310                         RS_COLUMN_LEGACY_ANT_B,
 311                         RS_COLUMN_INVALID,
 312                         RS_COLUMN_INVALID,
 313                 },
 314                 .checks = {
 315                         rs_siso_allow,
 316                         rs_ant_allow,
 317                         rs_sgi_allow,
 318                 },
 319         },
 320         [RS_COLUMN_MIMO2] = {
 321                 .mode = RS_MIMO2,
 322                 .ant = ANT_AB,
 323                 .next_columns = {
 324                         RS_COLUMN_SISO_ANT_A,
 325                         RS_COLUMN_MIMO2_SGI,
 326                         RS_COLUMN_LEGACY_ANT_A,
 327                         RS_COLUMN_LEGACY_ANT_B,
 328                         RS_COLUMN_INVALID,
 329                         RS_COLUMN_INVALID,
 330                         RS_COLUMN_INVALID,
 331                 },
 332                 .checks = {
 333                         rs_mimo_allow,
 334                 },
 335         },
 336         [RS_COLUMN_MIMO2_SGI] = {
 337                 .mode = RS_MIMO2,
 338                 .ant = ANT_AB,
 339                 .sgi = true,
 340                 .next_columns = {
 341                         RS_COLUMN_SISO_ANT_A_SGI,
 342                         RS_COLUMN_MIMO2,
 343                         RS_COLUMN_LEGACY_ANT_A,
 344                         RS_COLUMN_LEGACY_ANT_B,
 345                         RS_COLUMN_INVALID,
 346                         RS_COLUMN_INVALID,
 347                         RS_COLUMN_INVALID,
 348                 },
 349                 .checks = {
 350                         rs_mimo_allow,
 351                         rs_sgi_allow,
 352                 },
 353         },
 354 };
 355
 356 static inline u8 rs_extract_rate(u32 rate_n_flags)
 357 {
 358         /* also works for HT because bits 7:6 are zero there */
 359         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 360 }
 361
 362 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 363 {
 364         int idx = 0;
 365
 366         if (rate_n_flags & RATE_MCS_HT_MSK) {
 367                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 368                 idx += IWL_RATE_MCS_0_INDEX;
 369
 370                 /* skip 9M not supported in HT*/
 371                 if (idx >= IWL_RATE_9M_INDEX)
 372                         idx += 1;
 373                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 374                         return idx;
 375         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 376                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 377                 idx += IWL_RATE_MCS_0_INDEX;
 378
 379                 /* skip 9M not supported in VHT*/
 380                 if (idx >= IWL_RATE_9M_INDEX)
 381                         idx++;
 382                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 383                         return idx;
 384         } else {
 385                 /* legacy rate format, search for match in table */
 386
 387                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 388                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 389                         if (iwl_rates[idx].plcp == legacy_rate)
 390                                 return idx;
 391         }
 392
 393         return IWL_RATE_INVALID;
 394 }
 395
 396 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 397                                   struct ieee80211_sta *sta,
 398                                   struct iwl_lq_sta *lq_sta,
 399                                   int tid, bool ndp);
 400 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 401                            struct ieee80211_sta *sta,
 402                            struct iwl_lq_sta *lq_sta,
 403                            const struct rs_rate *initial_rate);
 404 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 405
 406 /**
 407  * The following tables contain the expected throughput metrics for all rates
 408  *
 409  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 410  *
 411  * where invalid entries are zeros.
 412  *
 413  * CCK rates are only valid in legacy table and will only be used in G
 414  * (2.4 GHz) band.
 415  */
 416
 417 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 418         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 419 };
 420
 421 /* Expected TpT tables. 4 indexes:
 422  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 423  */
 424 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 425         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 426         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 427         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 428         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 429 };
 430
 431 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 432         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 433         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 434         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 435         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 436 };
 437
 438 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 439         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 440         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 441         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 442         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 443 };
 444
 445 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
 446         {0, 0, 0, 0, 191, 0, 244, 288,  298,  308,  313,  318,  323,  328,  330},
 447         {0, 0, 0, 0, 200, 0, 251, 293,  302,  312,  317,  322,  327,  332,  334},
 448         {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
 449         {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
 450 };
 451
 452 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 453         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 454         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 455         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 456         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 457 };
 458
 459 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 460         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 461         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 462         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 463         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 464 };
 465
 466 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 467         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 468         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 469         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 470         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 471 };
 472
 473 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
 474         {0, 0, 0, 0, 240, 0, 278,  308,  313,  319,  322,  324,  328,  330,   334},
 475         {0, 0, 0, 0, 247, 0, 282,  310,  315,  320,  323,  325,  329,  332,   338},
 476         {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629,  10592},
 477         {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
 478 };
 479
 480 /* mbps, mcs */
 481 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 482         {  "1", "BPSK DSSS"},
 483         {  "2", "QPSK DSSS"},
 484         {"5.5", "BPSK CCK"},
 485         { "11", "QPSK CCK"},
 486         {  "6", "BPSK 1/2"},
 487         {  "9", "BPSK 1/2"},
 488         { "12", "QPSK 1/2"},
 489         { "18", "QPSK 3/4"},
 490         { "24", "16QAM 1/2"},
 491         { "36", "16QAM 3/4"},
 492         { "48", "64QAM 2/3"},
 493         { "54", "64QAM 3/4"},
 494         { "60", "64QAM 5/6"},
 495 };
 496
 497 #define MCS_INDEX_PER_STREAM    (8)
 498
 499 static const char *rs_pretty_ant(u8 ant)
 500 {
 501         static const char * const ant_name[] = {
 502                 [ANT_NONE] = "None",
 503                 [ANT_A]    = "A",
 504                 [ANT_B]    = "B",
 505                 [ANT_AB]   = "AB",
 506                 [ANT_C]    = "C",
 507                 [ANT_AC]   = "AC",
 508                 [ANT_BC]   = "BC",
 509                 [ANT_ABC]  = "ABC",
 510         };
 511
 512         if (ant > ANT_ABC)
 513                 return "UNKNOWN";
 514
 515         return ant_name[ant];
 516 }
 517
 518 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 519 {
 520         static const char * const lq_types[] = {
 521                 [LQ_NONE] = "NONE",
 522                 [LQ_LEGACY_A] = "LEGACY_A",
 523                 [LQ_LEGACY_G] = "LEGACY_G",
 524                 [LQ_HT_SISO] = "HT SISO",
 525                 [LQ_HT_MIMO2] = "HT MIMO",
 526                 [LQ_VHT_SISO] = "VHT SISO",
 527                 [LQ_VHT_MIMO2] = "VHT MIMO",
 528         };
 529
 530         if (type < LQ_NONE || type >= LQ_MAX)
 531                 return "UNKNOWN";
 532
 533         return lq_types[type];
 534 }
 535
 536 static char *rs_pretty_rate(const struct rs_rate *rate)
 537 {
 538         static char buf[40];
 539         static const char * const legacy_rates[] = {
 540                 [IWL_RATE_1M_INDEX] = "1M",
 541                 [IWL_RATE_2M_INDEX] = "2M",
 542                 [IWL_RATE_5M_INDEX] = "5.5M",
 543                 [IWL_RATE_11M_INDEX] = "11M",
 544                 [IWL_RATE_6M_INDEX] = "6M",
 545                 [IWL_RATE_9M_INDEX] = "9M",
 546                 [IWL_RATE_12M_INDEX] = "12M",
 547                 [IWL_RATE_18M_INDEX] = "18M",
 548                 [IWL_RATE_24M_INDEX] = "24M",
 549                 [IWL_RATE_36M_INDEX] = "36M",
 550                 [IWL_RATE_48M_INDEX] = "48M",
 551                 [IWL_RATE_54M_INDEX] = "54M",
 552         };
 553         static const char *const ht_vht_rates[] = {
 554                 [IWL_RATE_MCS_0_INDEX] = "MCS0",
 555                 [IWL_RATE_MCS_1_INDEX] = "MCS1",
 556                 [IWL_RATE_MCS_2_INDEX] = "MCS2",
 557                 [IWL_RATE_MCS_3_INDEX] = "MCS3",
 558                 [IWL_RATE_MCS_4_INDEX] = "MCS4",
 559                 [IWL_RATE_MCS_5_INDEX] = "MCS5",
 560                 [IWL_RATE_MCS_6_INDEX] = "MCS6",
 561                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
 562                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
 563                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
 564         };
 565         const char *rate_str;
 566
 567         if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
 568                 rate_str = legacy_rates[rate->index];
 569         else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
 570                  (rate->index >= IWL_RATE_MCS_0_INDEX) &&
 571                  (rate->index <= IWL_RATE_MCS_9_INDEX))
 572                 rate_str = ht_vht_rates[rate->index];
 573         else
 574                 rate_str = "BAD_RATE";
 575
 576         sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
 577                 rs_pretty_ant(rate->ant), rate_str);
 578         return buf;
 579 }
 580
 581 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 582                                 const char *prefix)
 583 {
 584         IWL_DEBUG_RATE(mvm,
 585                        "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
 586                        prefix, rs_pretty_rate(rate), rate->bw,
 587                        rate->sgi, rate->ldpc, rate->stbc);
 588 }
 589
 590 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 591 {
 592         window->data = 0;
 593         window->success_counter = 0;
 594         window->success_ratio = IWL_INVALID_VALUE;
 595         window->counter = 0;
 596         window->average_tpt = IWL_INVALID_VALUE;
 597 }
 598
 599 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 600                                             struct iwl_scale_tbl_info *tbl)
 601 {
 602         int i;
 603
 604         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 605         for (i = 0; i < IWL_RATE_COUNT; i++)
 606                 rs_rate_scale_clear_window(&tbl->win[i]);
 607
 608         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 609                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 610 }
 611
 612 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 613 {
 614         return (ant_type & valid_antenna) == ant_type;
 615 }
 616
 617 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 618                                      struct iwl_lq_sta *lq_data, u8 tid,
 619                                      struct ieee80211_sta *sta)
 620 {
 621         int ret = -EAGAIN;
 622
 623         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 624                      sta->addr, tid);
 625
 626         /* start BA session until the peer sends del BA */
 627         ret = ieee80211_start_tx_ba_session(sta, tid, 0);
 628         if (ret == -EAGAIN) {
 629                 /*
 630                  * driver and mac80211 is out of sync
 631                  * this might be cause by reloading firmware
 632                  * stop the tx ba session here
 633                  */
 634                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 635                         tid);
 636                 ieee80211_stop_tx_ba_session(sta, tid);
 637         }
 638         return ret;
 639 }
 640
 641 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
 642                               u8 tid, struct iwl_lq_sta *lq_sta,
 643                               struct ieee80211_sta *sta)
 644 {
 645         struct iwl_mvm_tid_data *tid_data;
 646
 647         /*
 648          * In AP mode, tid can be equal to IWL_MAX_TID_COUNT
 649          * when the frame is not QoS
 650          */
 651         if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) {
 652                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 653                         tid, IWL_MAX_TID_COUNT);
 654                 return;
 655         } else if (tid == IWL_MAX_TID_COUNT) {
 656                 return;
 657         }
 658
 659         tid_data = &mvmsta->tid_data[tid];
 660         if ((tid_data->state == IWL_AGG_OFF) &&
 661             (lq_sta->tx_agg_tid_en & BIT(tid)) &&
 662             (tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD)) {
 663                 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid);
 664                 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0)
 665                         tid_data->state = IWL_AGG_QUEUED;
 666         }
 667 }
 668
 669 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 670 {
 671         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 672                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 673                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 674 }
 675
 676 /*
 677  * Static function to get the expected throughput from an iwl_scale_tbl_info
 678  * that wraps a NULL pointer check
 679  */
 680 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 681 {
 682         if (tbl->expected_tpt)
 683                 return tbl->expected_tpt[rs_index];
 684         return 0;
 685 }
 686
 687 /**
 688  * rs_collect_tx_data - Update the success/failure sliding window
 689  *
 690  * We keep a sliding window of the last 62 packets transmitted
 691  * at this rate.  window->data contains the bitmask of successful
 692  * packets.
 693  */
 694 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
 695                                struct iwl_scale_tbl_info *tbl,
 696                                int scale_index, int attempts, int successes,
 697                                struct iwl_rate_scale_data *window)
 698 {
 699         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 700         s32 fail_count, tpt;
 701
 702         /* Get expected throughput */
 703         tpt = get_expected_tpt(tbl, scale_index);
 704
 705         /*
 706          * Keep track of only the latest 62 tx frame attempts in this rate's
 707          * history window; anything older isn't really relevant any more.
 708          * If we have filled up the sliding window, drop the oldest attempt;
 709          * if the oldest attempt (highest bit in bitmap) shows "success",
 710          * subtract "1" from the success counter (this is the main reason
 711          * we keep these bitmaps!).
 712          */
 713         while (attempts > 0) {
 714                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 715                         /* remove earliest */
 716                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 717
 718                         if (window->data & mask) {
 719                                 window->data &= ~mask;
 720                                 window->success_counter--;
 721                         }
 722                 }
 723
 724                 /* Increment frames-attempted counter */
 725                 window->counter++;
 726
 727                 /* Shift bitmap by one frame to throw away oldest history */
 728                 window->data <<= 1;
 729
 730                 /* Mark the most recent #successes attempts as successful */
 731                 if (successes > 0) {
 732                         window->success_counter++;
 733                         window->data |= 0x1;
 734                         successes--;
 735                 }
 736
 737                 attempts--;
 738         }
 739
 740         /* Calculate current success ratio, avoid divide-by-0! */
 741         if (window->counter > 0)
 742                 window->success_ratio = 128 * (100 * window->success_counter)
 743                                         / window->counter;
 744         else
 745                 window->success_ratio = IWL_INVALID_VALUE;
 746
 747         fail_count = window->counter - window->success_counter;
 748
 749         /* Calculate average throughput, if we have enough history. */
 750         if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
 751             (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
 752                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 753         else
 754                 window->average_tpt = IWL_INVALID_VALUE;
 755
 756         return 0;
 757 }
 758
 759 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
 760                                struct iwl_lq_sta *lq_sta,
 761                                struct iwl_scale_tbl_info *tbl,
 762                                int scale_index, int attempts, int successes,
 763                                u8 reduced_txp)
 764 {
 765         struct iwl_rate_scale_data *window = NULL;
 766
 767         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 768                 return -EINVAL;
 769
 770         window = &tbl->tpc_win[reduced_txp];
 771         return  _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 772                                     window);
 773 }
 774
 775 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm,
 776                                     struct iwl_mvm_sta *mvmsta,
 777                                     u8 tid, int successes)
 778 {
 779         struct iwl_mvm_tid_data *tid_data;
 780
 781         if (tid >= IWL_MAX_TID_COUNT)
 782                 return;
 783
 784         tid_data = &mvmsta->tid_data[tid];
 785
 786         /*
 787          * Measure if there're enough successful transmits per second.
 788          * These statistics are used only to decide if we can start a
 789          * BA session, so it should be updated only when A-MPDU is
 790          * off.
 791          */
 792         if (tid_data->state != IWL_AGG_OFF)
 793                 return;
 794
 795         if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) ||
 796             (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) {
 797                 tid_data->tx_count_last = tid_data->tx_count;
 798                 tid_data->tx_count = 0;
 799                 tid_data->tpt_meas_start = jiffies;
 800         } else {
 801                 tid_data->tx_count += successes;
 802         }
 803 }
 804
 805 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
 806                                struct iwl_mvm_sta *mvmsta, u8 tid,
 807                                struct iwl_scale_tbl_info *tbl,
 808                                int scale_index, int attempts, int successes)
 809 {
 810         struct iwl_rate_scale_data *window = NULL;
 811
 812         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 813                 return -EINVAL;
 814
 815         if (tbl->column != RS_COLUMN_INVALID) {
 816                 struct lq_sta_pers *pers = &mvmsta->lq_sta.pers;
 817
 818                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 819                 pers->tx_stats[tbl->column][scale_index].success += successes;
 820         }
 821
 822         rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes);
 823
 824         /* Select window for current tx bit rate */
 825         window = &(tbl->win[scale_index]);
 826         return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 827                                    window);
 828 }
 829
 830 /* Convert rs_rate object into ucode rate bitmask */
 831 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 832                                   struct rs_rate *rate)
 833 {
 834         u32 ucode_rate = 0;
 835         int index = rate->index;
 836
 837         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 838                          RATE_MCS_ANT_ABC_MSK);
 839
 840         if (is_legacy(rate)) {
 841                 ucode_rate |= iwl_rates[index].plcp;
 842                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 843                         ucode_rate |= RATE_MCS_CCK_MSK;
 844                 return ucode_rate;
 845         }
 846
 847         if (is_ht(rate)) {
 848                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 849                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 850                         index = IWL_LAST_HT_RATE;
 851                 }
 852                 ucode_rate |= RATE_MCS_HT_MSK;
 853
 854                 if (is_ht_siso(rate))
 855                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 856                 else if (is_ht_mimo2(rate))
 857                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 858                 else
 859                         WARN_ON_ONCE(1);
 860         } else if (is_vht(rate)) {
 861                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 862                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 863                         index = IWL_LAST_VHT_RATE;
 864                 }
 865                 ucode_rate |= RATE_MCS_VHT_MSK;
 866                 if (is_vht_siso(rate))
 867                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 868                 else if (is_vht_mimo2(rate))
 869                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 870                 else
 871                         WARN_ON_ONCE(1);
 872
 873         } else {
 874                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 875         }
 876
 877         if (is_siso(rate) && rate->stbc) {
 878                 /* To enable STBC we need to set both a flag and ANT_AB */
 879                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 880                 ucode_rate |= RATE_MCS_STBC_MSK;
 881         }
 882
 883         ucode_rate |= rate->bw;
 884         if (rate->sgi)
 885                 ucode_rate |= RATE_MCS_SGI_MSK;
 886         if (rate->ldpc)
 887                 ucode_rate |= RATE_MCS_LDPC_MSK;
 888
 889         return ucode_rate;
 890 }
 891
 892 /* Convert a ucode rate into an rs_rate object */
 893 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 894                                    enum nl80211_band band,
 895                                    struct rs_rate *rate)
 896 {
 897         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 898         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 899         u8 nss;
 900
 901         memset(rate, 0, sizeof(*rate));
 902         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 903
 904         if (rate->index == IWL_RATE_INVALID)
 905                 return -EINVAL;
 906
 907         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 908
 909         /* Legacy */
 910         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 911             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 912                 if (num_of_ant == 1) {
 913                         if (band == NL80211_BAND_5GHZ)
 914                                 rate->type = LQ_LEGACY_A;
 915                         else
 916                                 rate->type = LQ_LEGACY_G;
 917                 }
 918
 919                 return 0;
 920         }
 921
 922         /* HT or VHT */
 923         if (ucode_rate & RATE_MCS_SGI_MSK)
 924                 rate->sgi = true;
 925         if (ucode_rate & RATE_MCS_LDPC_MSK)
 926                 rate->ldpc = true;
 927         if (ucode_rate & RATE_MCS_STBC_MSK)
 928                 rate->stbc = true;
 929         if (ucode_rate & RATE_MCS_BF_MSK)
 930                 rate->bfer = true;
 931
 932         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 933
 934         if (ucode_rate & RATE_MCS_HT_MSK) {
 935                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 936                        RATE_HT_MCS_NSS_POS) + 1;
 937
 938                 if (nss == 1) {
 939                         rate->type = LQ_HT_SISO;
 940                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 941                                   "stbc %d bfer %d",
 942                                   rate->stbc, rate->bfer);
 943                 } else if (nss == 2) {
 944                         rate->type = LQ_HT_MIMO2;
 945                         WARN_ON_ONCE(num_of_ant != 2);
 946                 } else {
 947                         WARN_ON_ONCE(1);
 948                 }
 949         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 950                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 951                        RATE_VHT_MCS_NSS_POS) + 1;
 952
 953                 if (nss == 1) {
 954                         rate->type = LQ_VHT_SISO;
 955                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 956                                   "stbc %d bfer %d",
 957                                   rate->stbc, rate->bfer);
 958                 } else if (nss == 2) {
 959                         rate->type = LQ_VHT_MIMO2;
 960                         WARN_ON_ONCE(num_of_ant != 2);
 961                 } else {
 962                         WARN_ON_ONCE(1);
 963                 }
 964         }
 965
 966         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 967                      !is_vht(rate));
 968
 969         return 0;
 970 }
 971
 972 /* switch to another antenna/antennas and return 1 */
 973 /* if no other valid antenna found, return 0 */
 974 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 975 {
 976         u8 new_ant_type;
 977
 978         if (!rate->ant || rate->ant > ANT_ABC)
 979                 return 0;
 980
 981         if (!rs_is_valid_ant(valid_ant, rate->ant))
 982                 return 0;
 983
 984         new_ant_type = ant_toggle_lookup[rate->ant];
 985
 986         while ((new_ant_type != rate->ant) &&
 987                !rs_is_valid_ant(valid_ant, new_ant_type))
 988                 new_ant_type = ant_toggle_lookup[new_ant_type];
 989
 990         if (new_ant_type == rate->ant)
 991                 return 0;
 992
 993         rate->ant = new_ant_type;
 994
 995         return 1;
 996 }
 997
 998 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 999                                   struct rs_rate *rate)
1000 {
1001         if (is_legacy(rate))
1002                 return lq_sta->active_legacy_rate;
1003         else if (is_siso(rate))
1004                 return lq_sta->active_siso_rate;
1005         else if (is_mimo2(rate))
1006                 return lq_sta->active_mimo2_rate;
1007
1008         WARN_ON_ONCE(1);
1009         return 0;
1010 }
1011
1012 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
1013                                 int rate_type)
1014 {
1015         u8 high = IWL_RATE_INVALID;
1016         u8 low = IWL_RATE_INVALID;
1017
1018         /* 802.11A or ht walks to the next literal adjacent rate in
1019          * the rate table */
1020         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
1021                 int i;
1022                 u32 mask;
1023
1024                 /* Find the previous rate that is in the rate mask */
1025                 i = index - 1;
1026                 if (i >= 0)
1027                         mask = BIT(i);
1028                 for (; i >= 0; i--, mask >>= 1) {
1029                         if (rate_mask & mask) {
1030                                 low = i;
1031                                 break;
1032                         }
1033                 }
1034
1035                 /* Find the next rate that is in the rate mask */
1036                 i = index + 1;
1037                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
1038                         if (rate_mask & mask) {
1039                                 high = i;
1040                                 break;
1041                         }
1042                 }
1043
1044                 return (high << 8) | low;
1045         }
1046
1047         low = index;
1048         while (low != IWL_RATE_INVALID) {
1049                 low = iwl_rates[low].prev_rs;
1050                 if (low == IWL_RATE_INVALID)
1051                         break;
1052                 if (rate_mask & (1 << low))
1053                         break;
1054         }
1055
1056         high = index;
1057         while (high != IWL_RATE_INVALID) {
1058                 high = iwl_rates[high].next_rs;
1059                 if (high == IWL_RATE_INVALID)
1060                         break;
1061                 if (rate_mask & (1 << high))
1062                         break;
1063         }
1064
1065         return (high << 8) | low;
1066 }
1067
1068 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1069                                      struct rs_rate *rate)
1070 {
1071         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1072 }
1073
1074 /* Get the next supported lower rate in the current column.
1075  * Return true if bottom rate in the current column was reached
1076  */
1077 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1078                                         struct rs_rate *rate)
1079 {
1080         u8 low;
1081         u16 high_low;
1082         u16 rate_mask;
1083         struct iwl_mvm *mvm = lq_sta->pers.drv;
1084
1085         rate_mask = rs_get_supported_rates(lq_sta, rate);
1086         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1087                                         rate->type);
1088         low = high_low & 0xff;
1089
1090         /* Bottom rate of column reached */
1091         if (low == IWL_RATE_INVALID)
1092                 return true;
1093
1094         rate->index = low;
1095         return false;
1096 }
1097
1098 /* Get the next rate to use following a column downgrade */
1099 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1100                                           struct rs_rate *rate)
1101 {
1102         struct iwl_mvm *mvm = lq_sta->pers.drv;
1103
1104         if (is_legacy(rate)) {
1105                 /* No column to downgrade from Legacy */
1106                 return;
1107         } else if (is_siso(rate)) {
1108                 /* Downgrade to Legacy if we were in SISO */
1109                 if (lq_sta->band == NL80211_BAND_5GHZ)
1110                         rate->type = LQ_LEGACY_A;
1111                 else
1112                         rate->type = LQ_LEGACY_G;
1113
1114                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1115
1116                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1117                              rate->index > IWL_RATE_MCS_9_INDEX);
1118
1119                 rate->index = rs_ht_to_legacy[rate->index];
1120                 rate->ldpc = false;
1121         } else {
1122                 /* Downgrade to SISO with same MCS if in MIMO  */
1123                 rate->type = is_vht_mimo2(rate) ?
1124                         LQ_VHT_SISO : LQ_HT_SISO;
1125         }
1126
1127         if (num_of_ant(rate->ant) > 1)
1128                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1129
1130         /* Relevant in both switching to SISO or Legacy */
1131         rate->sgi = false;
1132
1133         if (!rs_rate_supported(lq_sta, rate))
1134                 rs_get_lower_rate_in_column(lq_sta, rate);
1135 }
1136
1137 /* Check if both rates share the same column */
1138 static inline bool rs_rate_column_match(struct rs_rate *a,
1139                                         struct rs_rate *b)
1140 {
1141         bool ant_match;
1142
1143         if (a->stbc || a->bfer)
1144                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1145         else
1146                 ant_match = (a->ant == b->ant);
1147
1148         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1149                 && ant_match;
1150 }
1151
1152 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1153 {
1154         if (is_legacy(rate)) {
1155                 if (rate->ant == ANT_A)
1156                         return RS_COLUMN_LEGACY_ANT_A;
1157
1158                 if (rate->ant == ANT_B)
1159                         return RS_COLUMN_LEGACY_ANT_B;
1160
1161                 goto err;
1162         }
1163
1164         if (is_siso(rate)) {
1165                 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1166                         return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1167                                 RS_COLUMN_SISO_ANT_A;
1168
1169                 if (rate->ant == ANT_B)
1170                         return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1171                                 RS_COLUMN_SISO_ANT_B;
1172
1173                 goto err;
1174         }
1175
1176         if (is_mimo(rate))
1177                 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1178
1179 err:
1180         return RS_COLUMN_INVALID;
1181 }
1182
1183 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1184 {
1185         u8 tid = IWL_MAX_TID_COUNT;
1186
1187         if (ieee80211_is_data_qos(hdr->frame_control)) {
1188                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1189                 tid = qc[0] & 0xf;
1190         }
1191
1192         if (unlikely(tid > IWL_MAX_TID_COUNT))
1193                 tid = IWL_MAX_TID_COUNT;
1194
1195         return tid;
1196 }
1197
1198 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1199                           int tid, struct ieee80211_tx_info *info, bool ndp)
1200 {
1201         int legacy_success;
1202         int retries;
1203         int i;
1204         struct iwl_lq_cmd *table;
1205         u32 lq_hwrate;
1206         struct rs_rate lq_rate, tx_resp_rate;
1207         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1208         u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
1209         u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
1210         u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
1211         u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1212         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1213         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1214
1215         /* Treat uninitialized rate scaling data same as non-existing. */
1216         if (!lq_sta) {
1217                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1218                 return;
1219         } else if (!lq_sta->pers.drv) {
1220                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1221                 return;
1222         }
1223
1224         /* This packet was aggregated but doesn't carry status info */
1225         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1226             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1227                 return;
1228
1229         if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
1230                                     &tx_resp_rate)) {
1231                 WARN_ON_ONCE(1);
1232                 return;
1233         }
1234
1235 #ifdef CONFIG_MAC80211_DEBUGFS
1236         /* Disable last tx check if we are debugging with fixed rate but
1237          * update tx stats */
1238         if (lq_sta->pers.dbg_fixed_rate) {
1239                 int index = tx_resp_rate.index;
1240                 enum rs_column column;
1241                 int attempts, success;
1242
1243                 column = rs_get_column_from_rate(&tx_resp_rate);
1244                 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1245                               "Can't map rate 0x%x to column",
1246                               tx_resp_hwrate))
1247                         return;
1248
1249                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1250                         attempts = info->status.ampdu_len;
1251                         success = info->status.ampdu_ack_len;
1252                 } else {
1253                         attempts = info->status.rates[0].count;
1254                         success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1255                 }
1256
1257                 lq_sta->pers.tx_stats[column][index].total += attempts;
1258                 lq_sta->pers.tx_stats[column][index].success += success;
1259
1260                 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1261                                tx_resp_hwrate, success, attempts);
1262                 return;
1263         }
1264 #endif
1265
1266         if (time_after(jiffies,
1267                        (unsigned long)(lq_sta->last_tx +
1268                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1269                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1270                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1271                 return;
1272         }
1273         lq_sta->last_tx = jiffies;
1274
1275         /* Ignore this Tx frame response if its initial rate doesn't match
1276          * that of latest Link Quality command.  There may be stragglers
1277          * from a previous Link Quality command, but we're no longer interested
1278          * in those; they're either from the "active" mode while we're trying
1279          * to check "search" mode, or a prior "search" mode after we've moved
1280          * to a new "search" mode (which might become the new "active" mode).
1281          */
1282         table = &lq_sta->lq;
1283         lq_hwrate = le32_to_cpu(table->rs_table[0]);
1284         if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
1285                 WARN_ON_ONCE(1);
1286                 return;
1287         }
1288
1289         /* Here we actually compare this rate to the latest LQ command */
1290         if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
1291                 IWL_DEBUG_RATE(mvm,
1292                                "tx resp color 0x%x does not match 0x%x\n",
1293                                lq_color, LQ_FLAG_COLOR_GET(table->flags));
1294
1295                 /*
1296                  * Since rates mis-match, the last LQ command may have failed.
1297                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1298                  * ... driver.
1299                  */
1300                 lq_sta->missed_rate_counter++;
1301                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1302                         lq_sta->missed_rate_counter = 0;
1303                         IWL_DEBUG_RATE(mvm,
1304                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1305                                        lq_sta->rs_state);
1306                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1307                 }
1308                 /* Regardless, ignore this status info for outdated rate */
1309                 return;
1310         } else
1311                 /* Rate did match, so reset the missed_rate_counter */
1312                 lq_sta->missed_rate_counter = 0;
1313
1314         if (!lq_sta->search_better_tbl) {
1315                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1316                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1317         } else {
1318                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1319                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1320         }
1321
1322         if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1323                 IWL_DEBUG_RATE(mvm,
1324                                "Neither active nor search matches tx rate\n");
1325                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1326                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1327                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1328                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1329                 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1330
1331                 /*
1332                  * no matching table found, let's by-pass the data collection
1333                  * and continue to perform rate scale to find the rate table
1334                  */
1335                 rs_stay_in_table(lq_sta, true);
1336                 goto done;
1337         }
1338
1339         /*
1340          * Updating the frame history depends on whether packets were
1341          * aggregated.
1342          *
1343          * For aggregation, all packets were transmitted at the same rate, the
1344          * first index into rate scale table.
1345          */
1346         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1347                 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
1348                                     info->status.ampdu_len,
1349                                     info->status.ampdu_ack_len,
1350                                     reduced_txp);
1351
1352                 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1353                  * it as a single frame loss as we don't want the success ratio
1354                  * to dip too quickly because a BA wasn't received.
1355                  * For TPC, there's no need for this optimisation since we want
1356                  * to recover very quickly from a bad power reduction and,
1357                  * therefore we'd like the success ratio to get an immediate hit
1358                  * when failing to get a BA, so we'd switch back to a lower or
1359                  * zero power reduction. When FW transmits agg with a rate
1360                  * different from the initial rate, it will not use reduced txp
1361                  * and will send BA notification twice (one empty with reduced
1362                  * txp equal to the value from LQ and one with reduced txp 0).
1363                  * We need to update counters for each txp level accordingly.
1364                  */
1365                 if (info->status.ampdu_ack_len == 0)
1366                         info->status.ampdu_len = 1;
1367
1368                 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, tx_resp_rate.index,
1369                                     info->status.ampdu_len,
1370                                     info->status.ampdu_ack_len);
1371
1372                 /* Update success/fail counts if not searching for new mode */
1373                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1374                         lq_sta->total_success += info->status.ampdu_ack_len;
1375                         lq_sta->total_failed += (info->status.ampdu_len -
1376                                         info->status.ampdu_ack_len);
1377                 }
1378         } else {
1379                 /* For legacy, update frame history with for each Tx retry. */
1380                 retries = info->status.rates[0].count - 1;
1381                 /* HW doesn't send more than 15 retries */
1382                 retries = min(retries, 15);
1383
1384                 /* The last transmission may have been successful */
1385                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1386                 /* Collect data for each rate used during failed TX attempts */
1387                 for (i = 0; i <= retries; ++i) {
1388                         lq_hwrate = le32_to_cpu(table->rs_table[i]);
1389                         if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
1390                                                     &lq_rate)) {
1391                                 WARN_ON_ONCE(1);
1392                                 return;
1393                         }
1394
1395                         /*
1396                          * Only collect stats if retried rate is in the same RS
1397                          * table as active/search.
1398                          */
1399                         if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1400                                 tmp_tbl = curr_tbl;
1401                         else if (rs_rate_column_match(&lq_rate,
1402                                                       &other_tbl->rate))
1403                                 tmp_tbl = other_tbl;
1404                         else
1405                                 continue;
1406
1407                         rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1408                                             tx_resp_rate.index, 1,
1409                                             i < retries ? 0 : legacy_success,
1410                                             reduced_txp);
1411                         rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
1412                                             tx_resp_rate.index, 1,
1413                                             i < retries ? 0 : legacy_success);
1414                 }
1415
1416                 /* Update success/fail counts if not searching for new mode */
1417                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1418                         lq_sta->total_success += legacy_success;
1419                         lq_sta->total_failed += retries + (1 - legacy_success);
1420                 }
1421         }
1422         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1423         lq_sta->last_rate_n_flags = lq_hwrate;
1424         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1425 done:
1426         /* See if there's a better rate or modulation mode to try. */
1427         if (sta->supp_rates[info->band])
1428                 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
1429 }
1430
1431 /*
1432  * mac80211 sends us Tx status
1433  */
1434 static void rs_mac80211_tx_status(void *mvm_r,
1435                                   struct ieee80211_supported_band *sband,
1436                                   struct ieee80211_sta *sta, void *priv_sta,
1437                                   struct sk_buff *skb)
1438 {
1439         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1440         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1441         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1442         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1443
1444         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1445                 return;
1446
1447         if (!ieee80211_is_data(hdr->frame_control) ||
1448             info->flags & IEEE80211_TX_CTL_NO_ACK)
1449                 return;
1450
1451         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1452                              ieee80211_is_qos_nullfunc(hdr->frame_control));
1453 }
1454
1455 /*
1456  * Begin a period of staying with a selected modulation mode.
1457  * Set "stay_in_tbl" flag to prevent any mode switches.
1458  * Set frame tx success limits according to legacy vs. high-throughput,
1459  * and reset overall (spanning all rates) tx success history statistics.
1460  * These control how long we stay using same modulation mode before
1461  * searching for a new mode.
1462  */
1463 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1464                                  struct iwl_lq_sta *lq_sta)
1465 {
1466         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1467         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1468         if (is_legacy) {
1469                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1470                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1471                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1472         } else {
1473                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1474                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1475                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1476         }
1477         lq_sta->table_count = 0;
1478         lq_sta->total_failed = 0;
1479         lq_sta->total_success = 0;
1480         lq_sta->flush_timer = jiffies;
1481         lq_sta->visited_columns = 0;
1482 }
1483
1484 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1485 {
1486         if (rate_mask)
1487                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1488         return IWL_RATE_INVALID;
1489 }
1490
1491 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1492                                    const struct rs_tx_column *column)
1493 {
1494         switch (column->mode) {
1495         case RS_LEGACY:
1496                 return lq_sta->max_legacy_rate_idx;
1497         case RS_SISO:
1498                 return lq_sta->max_siso_rate_idx;
1499         case RS_MIMO2:
1500                 return lq_sta->max_mimo2_rate_idx;
1501         default:
1502                 WARN_ON_ONCE(1);
1503         }
1504
1505         return lq_sta->max_legacy_rate_idx;
1506 }
1507
1508 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1509                                             const struct rs_tx_column *column,
1510                                             u32 bw)
1511 {
1512         /* Used to choose among HT tables */
1513         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1514
1515         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1516                          column->mode != RS_SISO &&
1517                          column->mode != RS_MIMO2))
1518                 return expected_tpt_legacy;
1519
1520         /* Legacy rates have only one table */
1521         if (column->mode == RS_LEGACY)
1522                 return expected_tpt_legacy;
1523
1524         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1525         /* Choose among many HT tables depending on number of streams
1526          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1527          * status */
1528         if (column->mode == RS_SISO) {
1529                 switch (bw) {
1530                 case RATE_MCS_CHAN_WIDTH_20:
1531                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1532                         break;
1533                 case RATE_MCS_CHAN_WIDTH_40:
1534                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1535                         break;
1536                 case RATE_MCS_CHAN_WIDTH_80:
1537                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1538                         break;
1539                 case RATE_MCS_CHAN_WIDTH_160:
1540                         ht_tbl_pointer = expected_tpt_siso_160MHz;
1541                         break;
1542                 default:
1543                         WARN_ON_ONCE(1);
1544                 }
1545         } else if (column->mode == RS_MIMO2) {
1546                 switch (bw) {
1547                 case RATE_MCS_CHAN_WIDTH_20:
1548                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1549                         break;
1550                 case RATE_MCS_CHAN_WIDTH_40:
1551                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1552                         break;
1553                 case RATE_MCS_CHAN_WIDTH_80:
1554                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1555                         break;
1556                 case RATE_MCS_CHAN_WIDTH_160:
1557                         ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1558                         break;
1559                 default:
1560                         WARN_ON_ONCE(1);
1561                 }
1562         } else {
1563                 WARN_ON_ONCE(1);
1564         }
1565
1566         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1567                 return ht_tbl_pointer[0];
1568         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1569                 return ht_tbl_pointer[1];
1570         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1571                 return ht_tbl_pointer[2];
1572         else                                            /* AGG+SGI */
1573                 return ht_tbl_pointer[3];
1574 }
1575
1576 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1577                                       struct iwl_scale_tbl_info *tbl)
1578 {
1579         struct rs_rate *rate = &tbl->rate;
1580         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1581
1582         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1583 }
1584
1585 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1586                             struct iwl_lq_sta *lq_sta,
1587                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1588                             unsigned long rate_mask, s8 index)
1589 {
1590         struct iwl_scale_tbl_info *active_tbl =
1591             &(lq_sta->lq_info[lq_sta->active_tbl]);
1592         s32 success_ratio = active_tbl->win[index].success_ratio;
1593         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1594         const u16 *tpt_tbl = tbl->expected_tpt;
1595         u16 high_low;
1596         u32 target_tpt;
1597         int rate_idx;
1598
1599         if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1600                 target_tpt = 100 * expected_current_tpt;
1601                 IWL_DEBUG_RATE(mvm,
1602                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1603                                success_ratio, target_tpt);
1604         } else {
1605                 target_tpt = lq_sta->last_tpt;
1606                 IWL_DEBUG_RATE(mvm,
1607                                "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1608                                success_ratio, target_tpt);
1609         }
1610
1611         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1612
1613         while (rate_idx != IWL_RATE_INVALID) {
1614                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1615                         break;
1616
1617                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1618                                                 tbl->rate.type);
1619
1620                 rate_idx = (high_low >> 8) & 0xff;
1621         }
1622
1623         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1624                        rate_idx, target_tpt,
1625                        rate_idx != IWL_RATE_INVALID ?
1626                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1627
1628         return rate_idx;
1629 }
1630
1631 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1632 {
1633         switch (sta->bandwidth) {
1634         case IEEE80211_STA_RX_BW_160:
1635                 return RATE_MCS_CHAN_WIDTH_160;
1636         case IEEE80211_STA_RX_BW_80:
1637                 return RATE_MCS_CHAN_WIDTH_80;
1638         case IEEE80211_STA_RX_BW_40:
1639                 return RATE_MCS_CHAN_WIDTH_40;
1640         case IEEE80211_STA_RX_BW_20:
1641         default:
1642                 return RATE_MCS_CHAN_WIDTH_20;
1643         }
1644 }
1645
1646 /*
1647  * Check whether we should continue using same modulation mode, or
1648  * begin search for a new mode, based on:
1649  * 1) # tx successes or failures while using this mode
1650  * 2) # times calling this function
1651  * 3) elapsed time in this mode (not used, for now)
1652  */
1653 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1654 {
1655         struct iwl_scale_tbl_info *tbl;
1656         int active_tbl;
1657         int flush_interval_passed = 0;
1658         struct iwl_mvm *mvm;
1659
1660         mvm = lq_sta->pers.drv;
1661         active_tbl = lq_sta->active_tbl;
1662
1663         tbl = &(lq_sta->lq_info[active_tbl]);
1664
1665         /* If we've been disallowing search, see if we should now allow it */
1666         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1667                 /* Elapsed time using current modulation mode */
1668                 if (lq_sta->flush_timer)
1669                         flush_interval_passed =
1670                                 time_after(jiffies,
1671                                            (unsigned long)(lq_sta->flush_timer +
1672                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1673
1674                 /*
1675                  * Check if we should allow search for new modulation mode.
1676                  * If many frames have failed or succeeded, or we've used
1677                  * this same modulation for a long time, allow search, and
1678                  * reset history stats that keep track of whether we should
1679                  * allow a new search.  Also (below) reset all bitmaps and
1680                  * stats in active history.
1681                  */
1682                 if (force_search ||
1683                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1684                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1685                     ((!lq_sta->search_better_tbl) &&
1686                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1687                         IWL_DEBUG_RATE(mvm,
1688                                        "LQ: stay is expired %d %d %d\n",
1689                                      lq_sta->total_failed,
1690                                      lq_sta->total_success,
1691                                      flush_interval_passed);
1692
1693                         /* Allow search for new mode */
1694                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1695                         IWL_DEBUG_RATE(mvm,
1696                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1697                         lq_sta->total_failed = 0;
1698                         lq_sta->total_success = 0;
1699                         lq_sta->flush_timer = 0;
1700                         /* mark the current column as visited */
1701                         lq_sta->visited_columns = BIT(tbl->column);
1702                 /*
1703                  * Else if we've used this modulation mode enough repetitions
1704                  * (regardless of elapsed time or success/failure), reset
1705                  * history bitmaps and rate-specific stats for all rates in
1706                  * active table.
1707                  */
1708                 } else {
1709                         lq_sta->table_count++;
1710                         if (lq_sta->table_count >=
1711                             lq_sta->table_count_limit) {
1712                                 lq_sta->table_count = 0;
1713
1714                                 IWL_DEBUG_RATE(mvm,
1715                                                "LQ: stay in table clear win\n");
1716                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1717                         }
1718                 }
1719
1720                 /* If transitioning to allow "search", reset all history
1721                  * bitmaps and stats in active table (this will become the new
1722                  * "search" table). */
1723                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1724                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1725                 }
1726         }
1727 }
1728
1729 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1730                              struct iwl_scale_tbl_info *tbl,
1731                              enum rs_action scale_action)
1732 {
1733         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1734
1735         if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1736             tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1737             scale_action == RS_ACTION_DOWNSCALE)
1738                 mvmsta->tlc_amsdu = false;
1739         else
1740                 mvmsta->tlc_amsdu = true;
1741 }
1742
1743 /*
1744  * setup rate table in uCode
1745  */
1746 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1747                                struct ieee80211_sta *sta,
1748                                struct iwl_lq_sta *lq_sta,
1749                                struct iwl_scale_tbl_info *tbl)
1750 {
1751         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1752         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1753 }
1754
1755 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1756                               struct ieee80211_sta *sta,
1757                               struct iwl_lq_sta *lq_sta,
1758                               struct iwl_scale_tbl_info *tbl,
1759                               enum rs_action scale_action)
1760 {
1761         if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1762                 return false;
1763
1764         if (!is_vht_siso(&tbl->rate))
1765                 return false;
1766
1767         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1768             (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1769             (scale_action == RS_ACTION_DOWNSCALE)) {
1770                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1771                 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1772                 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1773                 goto tweaked;
1774         }
1775
1776         /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1777          * sustainable, i.e. we're past the test window. We can't go back
1778          * if MCS5 is just tested as this will happen always after switching
1779          * to 20Mhz MCS4 because the rate stats are cleared.
1780          */
1781         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1782             (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1783              (scale_action == RS_ACTION_STAY)) ||
1784              ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1785               (scale_action == RS_ACTION_UPSCALE)))) {
1786                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1787                 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1788                 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1789                 goto tweaked;
1790         }
1791
1792         return false;
1793
1794 tweaked:
1795         rs_set_expected_tpt_table(lq_sta, tbl);
1796         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1797         return true;
1798 }
1799
1800 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1801                                          struct iwl_lq_sta *lq_sta,
1802                                          struct ieee80211_sta *sta,
1803                                          struct iwl_scale_tbl_info *tbl)
1804 {
1805         int i, j, max_rate;
1806         enum rs_column next_col_id;
1807         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1808         const struct rs_tx_column *next_col;
1809         allow_column_func_t allow_func;
1810         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1811         const u16 *expected_tpt_tbl;
1812         u16 tpt, max_expected_tpt;
1813
1814         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1815                 next_col_id = curr_col->next_columns[i];
1816
1817                 if (next_col_id == RS_COLUMN_INVALID)
1818                         continue;
1819
1820                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1821                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1822                                        next_col_id);
1823                         continue;
1824                 }
1825
1826                 next_col = &rs_tx_columns[next_col_id];
1827
1828                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1829                         IWL_DEBUG_RATE(mvm,
1830                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1831                                        next_col_id, valid_ants, next_col->ant);
1832                         continue;
1833                 }
1834
1835                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1836                         allow_func = next_col->checks[j];
1837                         if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1838                                                       next_col))
1839                                 break;
1840                 }
1841
1842                 if (j != MAX_COLUMN_CHECKS) {
1843                         IWL_DEBUG_RATE(mvm,
1844                                        "Skip column %d: not allowed (check %d failed)\n",
1845                                        next_col_id, j);
1846
1847                         continue;
1848                 }
1849
1850                 tpt = lq_sta->last_tpt / 100;
1851                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1852                                                      rs_bw_from_sta_bw(sta));
1853                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1854                         continue;
1855
1856                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1857                 if (max_rate == IWL_RATE_INVALID) {
1858                         IWL_DEBUG_RATE(mvm,
1859                                        "Skip column %d: no rate is allowed in this column\n",
1860                                        next_col_id);
1861                         continue;
1862                 }
1863
1864                 max_expected_tpt = expected_tpt_tbl[max_rate];
1865                 if (tpt >= max_expected_tpt) {
1866                         IWL_DEBUG_RATE(mvm,
1867                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1868                                        next_col_id, max_expected_tpt, tpt);
1869                         continue;
1870                 }
1871
1872                 IWL_DEBUG_RATE(mvm,
1873                                "Found potential column %d. Max expected %d current %d\n",
1874                                next_col_id, max_expected_tpt, tpt);
1875                 break;
1876         }
1877
1878         if (i == MAX_NEXT_COLUMNS)
1879                 return RS_COLUMN_INVALID;
1880
1881         return next_col_id;
1882 }
1883
1884 static int rs_switch_to_column(struct iwl_mvm *mvm,
1885                                struct iwl_lq_sta *lq_sta,
1886                                struct ieee80211_sta *sta,
1887                                enum rs_column col_id)
1888 {
1889         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1890         struct iwl_scale_tbl_info *search_tbl =
1891                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1892         struct rs_rate *rate = &search_tbl->rate;
1893         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1894         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1895         unsigned long rate_mask = 0;
1896         u32 rate_idx = 0;
1897
1898         memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1899
1900         rate->sgi = column->sgi;
1901         rate->ant = column->ant;
1902
1903         if (column->mode == RS_LEGACY) {
1904                 if (lq_sta->band == NL80211_BAND_5GHZ)
1905                         rate->type = LQ_LEGACY_A;
1906                 else
1907                         rate->type = LQ_LEGACY_G;
1908
1909                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1910                 rate->ldpc = false;
1911                 rate_mask = lq_sta->active_legacy_rate;
1912         } else if (column->mode == RS_SISO) {
1913                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1914                 rate_mask = lq_sta->active_siso_rate;
1915         } else if (column->mode == RS_MIMO2) {
1916                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1917                 rate_mask = lq_sta->active_mimo2_rate;
1918         } else {
1919                 WARN_ONCE(1, "Bad column mode");
1920         }
1921
1922         if (column->mode != RS_LEGACY) {
1923                 rate->bw = rs_bw_from_sta_bw(sta);
1924                 rate->ldpc = lq_sta->ldpc;
1925         }
1926
1927         search_tbl->column = col_id;
1928         rs_set_expected_tpt_table(lq_sta, search_tbl);
1929
1930         lq_sta->visited_columns |= BIT(col_id);
1931
1932         /* Get the best matching rate if we're changing modes. e.g.
1933          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1934          */
1935         if (curr_column->mode != column->mode) {
1936                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1937                                             rate_mask, rate->index);
1938
1939                 if ((rate_idx == IWL_RATE_INVALID) ||
1940                     !(BIT(rate_idx) & rate_mask)) {
1941                         IWL_DEBUG_RATE(mvm,
1942                                        "can not switch with index %d"
1943                                        " rate mask %lx\n",
1944                                        rate_idx, rate_mask);
1945
1946                         goto err;
1947                 }
1948
1949                 rate->index = rate_idx;
1950         }
1951
1952         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1953                        col_id, rate->index);
1954
1955         return 0;
1956
1957 err:
1958         rate->type = LQ_NONE;
1959         return -1;
1960 }
1961
1962 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1963                                          struct iwl_scale_tbl_info *tbl,
1964                                          s32 sr, int low, int high,
1965                                          int current_tpt,
1966                                          int low_tpt, int high_tpt)
1967 {
1968         enum rs_action action = RS_ACTION_STAY;
1969
1970         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1971             (current_tpt == 0)) {
1972                 IWL_DEBUG_RATE(mvm,
1973                                "Decrease rate because of low SR\n");
1974                 return RS_ACTION_DOWNSCALE;
1975         }
1976
1977         if ((low_tpt == IWL_INVALID_VALUE) &&
1978             (high_tpt == IWL_INVALID_VALUE) &&
1979             (high != IWL_RATE_INVALID)) {
1980                 IWL_DEBUG_RATE(mvm,
1981                                "No data about high/low rates. Increase rate\n");
1982                 return RS_ACTION_UPSCALE;
1983         }
1984
1985         if ((high_tpt == IWL_INVALID_VALUE) &&
1986             (high != IWL_RATE_INVALID) &&
1987             (low_tpt != IWL_INVALID_VALUE) &&
1988             (low_tpt < current_tpt)) {
1989                 IWL_DEBUG_RATE(mvm,
1990                                "No data about high rate and low rate is worse. Increase rate\n");
1991                 return RS_ACTION_UPSCALE;
1992         }
1993
1994         if ((high_tpt != IWL_INVALID_VALUE) &&
1995             (high_tpt > current_tpt)) {
1996                 IWL_DEBUG_RATE(mvm,
1997                                "Higher rate is better. Increate rate\n");
1998                 return RS_ACTION_UPSCALE;
1999         }
2000
2001         if ((low_tpt != IWL_INVALID_VALUE) &&
2002             (high_tpt != IWL_INVALID_VALUE) &&
2003             (low_tpt < current_tpt) &&
2004             (high_tpt < current_tpt)) {
2005                 IWL_DEBUG_RATE(mvm,
2006                                "Both high and low are worse. Maintain rate\n");
2007                 return RS_ACTION_STAY;
2008         }
2009
2010         if ((low_tpt != IWL_INVALID_VALUE) &&
2011             (low_tpt > current_tpt)) {
2012                 IWL_DEBUG_RATE(mvm,
2013                                "Lower rate is better\n");
2014                 action = RS_ACTION_DOWNSCALE;
2015                 goto out;
2016         }
2017
2018         if ((low_tpt == IWL_INVALID_VALUE) &&
2019             (low != IWL_RATE_INVALID)) {
2020                 IWL_DEBUG_RATE(mvm,
2021                                "No data about lower rate\n");
2022                 action = RS_ACTION_DOWNSCALE;
2023                 goto out;
2024         }
2025
2026         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
2027
2028 out:
2029         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
2030                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
2031                         IWL_DEBUG_RATE(mvm,
2032                                        "SR is above NO DECREASE. Avoid downscale\n");
2033                         action = RS_ACTION_STAY;
2034                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
2035                         IWL_DEBUG_RATE(mvm,
2036                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
2037                         action = RS_ACTION_STAY;
2038                 } else {
2039                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
2040                 }
2041         }
2042
2043         return action;
2044 }
2045
2046 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2047                           struct iwl_lq_sta *lq_sta)
2048 {
2049         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
2050          * supports STBC of at least 1*SS
2051          */
2052         if (!lq_sta->stbc_capable)
2053                 return false;
2054
2055         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2056                 return false;
2057
2058         return true;
2059 }
2060
2061 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2062                                 int *weaker, int *stronger)
2063 {
2064         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2065         if (*weaker > TPC_MAX_REDUCTION)
2066                 *weaker = TPC_INVALID;
2067
2068         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2069         if (*stronger < 0)
2070                 *stronger = TPC_INVALID;
2071 }
2072
2073 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2074                            struct rs_rate *rate, enum nl80211_band band)
2075 {
2076         int index = rate->index;
2077         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2078         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2079                                 !vif->bss_conf.ps);
2080
2081         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2082                        cam, sta_ps_disabled);
2083         /*
2084          * allow tpc only if power management is enabled, or bt coex
2085          * activity grade allows it and we are on 2.4Ghz.
2086          */
2087         if ((cam || sta_ps_disabled) &&
2088             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2089                 return false;
2090
2091         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2092         if (is_legacy(rate))
2093                 return index == IWL_RATE_54M_INDEX;
2094         if (is_ht(rate))
2095                 return index == IWL_RATE_MCS_7_INDEX;
2096         if (is_vht(rate))
2097                 return index == IWL_RATE_MCS_7_INDEX ||
2098                        index == IWL_RATE_MCS_8_INDEX ||
2099                        index == IWL_RATE_MCS_9_INDEX;
2100
2101         WARN_ON_ONCE(1);
2102         return false;
2103 }
2104
2105 enum tpc_action {
2106         TPC_ACTION_STAY,
2107         TPC_ACTION_DECREASE,
2108         TPC_ACTION_INCREASE,
2109         TPC_ACTION_NO_RESTIRCTION,
2110 };
2111
2112 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2113                                          s32 sr, int weak, int strong,
2114                                          int current_tpt,
2115                                          int weak_tpt, int strong_tpt)
2116 {
2117         /* stay until we have valid tpt */
2118         if (current_tpt == IWL_INVALID_VALUE) {
2119                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2120                 return TPC_ACTION_STAY;
2121         }
2122
2123         /* Too many failures, increase txp */
2124         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2125             current_tpt == 0) {
2126                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2127                 return TPC_ACTION_NO_RESTIRCTION;
2128         }
2129
2130         /* try decreasing first if applicable */
2131         if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2132             weak != TPC_INVALID) {
2133                 if (weak_tpt == IWL_INVALID_VALUE &&
2134                     (strong_tpt == IWL_INVALID_VALUE ||
2135                      current_tpt >= strong_tpt)) {
2136                         IWL_DEBUG_RATE(mvm,
2137                                        "no weak txp measurement. decrease txp\n");
2138                         return TPC_ACTION_DECREASE;
2139                 }
2140
2141                 if (weak_tpt > current_tpt) {
2142                         IWL_DEBUG_RATE(mvm,
2143                                        "lower txp has better tpt. decrease txp\n");
2144                         return TPC_ACTION_DECREASE;
2145                 }
2146         }
2147
2148         /* next, increase if needed */
2149         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2150             strong != TPC_INVALID) {
2151                 if (weak_tpt == IWL_INVALID_VALUE &&
2152                     strong_tpt != IWL_INVALID_VALUE &&
2153                     current_tpt < strong_tpt) {
2154                         IWL_DEBUG_RATE(mvm,
2155                                        "higher txp has better tpt. increase txp\n");
2156                         return TPC_ACTION_INCREASE;
2157                 }
2158
2159                 if (weak_tpt < current_tpt &&
2160                     (strong_tpt == IWL_INVALID_VALUE ||
2161                      strong_tpt > current_tpt)) {
2162                         IWL_DEBUG_RATE(mvm,
2163                                        "lower txp has worse tpt. increase txp\n");
2164                         return TPC_ACTION_INCREASE;
2165                 }
2166         }
2167
2168         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2169         return TPC_ACTION_STAY;
2170 }
2171
2172 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2173                            struct ieee80211_sta *sta,
2174                            struct iwl_lq_sta *lq_sta,
2175                            struct iwl_scale_tbl_info *tbl)
2176 {
2177         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2178         struct ieee80211_vif *vif = mvm_sta->vif;
2179         struct ieee80211_chanctx_conf *chanctx_conf;
2180         enum nl80211_band band;
2181         struct iwl_rate_scale_data *window;
2182         struct rs_rate *rate = &tbl->rate;
2183         enum tpc_action action;
2184         s32 sr;
2185         u8 cur = lq_sta->lq.reduced_tpc;
2186         int current_tpt;
2187         int weak, strong;
2188         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2189
2190 #ifdef CONFIG_MAC80211_DEBUGFS
2191         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2192                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2193                                lq_sta->pers.dbg_fixed_txp_reduction);
2194                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2195                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2196         }
2197 #endif
2198
2199         rcu_read_lock();
2200         chanctx_conf = rcu_dereference(vif->chanctx_conf);
2201         if (WARN_ON(!chanctx_conf))
2202                 band = NUM_NL80211_BANDS;
2203         else
2204                 band = chanctx_conf->def.chan->band;
2205         rcu_read_unlock();
2206
2207         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2208                 IWL_DEBUG_RATE(mvm,
2209                                "tpc is not allowed. remove txp restrictions\n");
2210                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2211                 return cur != TPC_NO_REDUCTION;
2212         }
2213
2214         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2215
2216         /* Collect measured throughputs for current and adjacent rates */
2217         window = tbl->tpc_win;
2218         sr = window[cur].success_ratio;
2219         current_tpt = window[cur].average_tpt;
2220         if (weak != TPC_INVALID)
2221                 weak_tpt = window[weak].average_tpt;
2222         if (strong != TPC_INVALID)
2223                 strong_tpt = window[strong].average_tpt;
2224
2225         IWL_DEBUG_RATE(mvm,
2226                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2227                        cur, current_tpt, sr, weak, strong,
2228                        weak_tpt, strong_tpt);
2229
2230         action = rs_get_tpc_action(mvm, sr, weak, strong,
2231                                    current_tpt, weak_tpt, strong_tpt);
2232
2233         /* override actions if we are on the edge */
2234         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2235                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2236                 action = TPC_ACTION_STAY;
2237         } else if (strong == TPC_INVALID &&
2238                    (action == TPC_ACTION_INCREASE ||
2239                     action == TPC_ACTION_NO_RESTIRCTION)) {
2240                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2241                 action = TPC_ACTION_STAY;
2242         }
2243
2244         switch (action) {
2245         case TPC_ACTION_DECREASE:
2246                 lq_sta->lq.reduced_tpc = weak;
2247                 return true;
2248         case TPC_ACTION_INCREASE:
2249                 lq_sta->lq.reduced_tpc = strong;
2250                 return true;
2251         case TPC_ACTION_NO_RESTIRCTION:
2252                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2253                 return true;
2254         case TPC_ACTION_STAY:
2255                 /* do nothing */
2256                 break;
2257         }
2258         return false;
2259 }
2260
2261 /*
2262  * Do rate scaling and search for new modulation mode.
2263  */
2264 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2265                                   struct ieee80211_sta *sta,
2266                                   struct iwl_lq_sta *lq_sta,
2267                                   int tid, bool ndp)
2268 {
2269         int low = IWL_RATE_INVALID;
2270         int high = IWL_RATE_INVALID;
2271         int index;
2272         struct iwl_rate_scale_data *window = NULL;
2273         int current_tpt = IWL_INVALID_VALUE;
2274         int low_tpt = IWL_INVALID_VALUE;
2275         int high_tpt = IWL_INVALID_VALUE;
2276         u32 fail_count;
2277         enum rs_action scale_action = RS_ACTION_STAY;
2278         u16 rate_mask;
2279         u8 update_lq = 0;
2280         struct iwl_scale_tbl_info *tbl, *tbl1;
2281         u8 active_tbl = 0;
2282         u8 done_search = 0;
2283         u16 high_low;
2284         s32 sr;
2285         u8 prev_agg = lq_sta->is_agg;
2286         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2287         struct rs_rate *rate;
2288
2289         lq_sta->is_agg = !!mvmsta->agg_tids;
2290
2291         /*
2292          * Select rate-scale / modulation-mode table to work with in
2293          * the rest of this function:  "search" if searching for better
2294          * modulation mode, or "active" if doing rate scaling within a mode.
2295          */
2296         if (!lq_sta->search_better_tbl)
2297                 active_tbl = lq_sta->active_tbl;
2298         else
2299                 active_tbl = 1 - lq_sta->active_tbl;
2300
2301         tbl = &(lq_sta->lq_info[active_tbl]);
2302         rate = &tbl->rate;
2303
2304         if (prev_agg != lq_sta->is_agg) {
2305                 IWL_DEBUG_RATE(mvm,
2306                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2307                                prev_agg, lq_sta->is_agg);
2308                 rs_set_expected_tpt_table(lq_sta, tbl);
2309                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2310         }
2311
2312         /* current tx rate */
2313         index = rate->index;
2314
2315         /* rates available for this association, and for modulation mode */
2316         rate_mask = rs_get_supported_rates(lq_sta, rate);
2317
2318         if (!(BIT(index) & rate_mask)) {
2319                 IWL_ERR(mvm, "Current Rate is not valid\n");
2320                 if (lq_sta->search_better_tbl) {
2321                         /* revert to active table if search table is not valid*/
2322                         rate->type = LQ_NONE;
2323                         lq_sta->search_better_tbl = 0;
2324                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2325                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2326                 }
2327                 return;
2328         }
2329
2330         /* Get expected throughput table and history window for current rate */
2331         if (!tbl->expected_tpt) {
2332                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2333                 return;
2334         }
2335
2336         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2337         window = &(tbl->win[index]);
2338
2339         /*
2340          * If there is not enough history to calculate actual average
2341          * throughput, keep analyzing results of more tx frames, without
2342          * changing rate or mode (bypass most of the rest of this function).
2343          * Set up new rate table in uCode only if old rate is not supported
2344          * in current association (use new rate found above).
2345          */
2346         fail_count = window->counter - window->success_counter;
2347         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2348             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2349                 IWL_DEBUG_RATE(mvm,
2350                                "%s: Test Window: succ %d total %d\n",
2351                                rs_pretty_rate(rate),
2352                                window->success_counter, window->counter);
2353
2354                 /* Can't calculate this yet; not enough history */
2355                 window->average_tpt = IWL_INVALID_VALUE;
2356
2357                 /* Should we stay with this modulation mode,
2358                  * or search for a new one? */
2359                 rs_stay_in_table(lq_sta, false);
2360
2361                 return;
2362         }
2363
2364         /* If we are searching for better modulation mode, check success. */
2365         if (lq_sta->search_better_tbl) {
2366                 /* If good success, continue using the "search" mode;
2367                  * no need to send new link quality command, since we're
2368                  * continuing to use the setup that we've been trying. */
2369                 if (window->average_tpt > lq_sta->last_tpt) {
2370                         IWL_DEBUG_RATE(mvm,
2371                                        "SWITCHING TO NEW TABLE SR: %d "
2372                                        "cur-tpt %d old-tpt %d\n",
2373                                        window->success_ratio,
2374                                        window->average_tpt,
2375                                        lq_sta->last_tpt);
2376
2377                         /* Swap tables; "search" becomes "active" */
2378                         lq_sta->active_tbl = active_tbl;
2379                         current_tpt = window->average_tpt;
2380                 /* Else poor success; go back to mode in "active" table */
2381                 } else {
2382                         IWL_DEBUG_RATE(mvm,
2383                                        "GOING BACK TO THE OLD TABLE: SR %d "
2384                                        "cur-tpt %d old-tpt %d\n",
2385                                        window->success_ratio,
2386                                        window->average_tpt,
2387                                        lq_sta->last_tpt);
2388
2389                         /* Nullify "search" table */
2390                         rate->type = LQ_NONE;
2391
2392                         /* Revert to "active" table */
2393                         active_tbl = lq_sta->active_tbl;
2394                         tbl = &(lq_sta->lq_info[active_tbl]);
2395
2396                         /* Revert to "active" rate and throughput info */
2397                         index = tbl->rate.index;
2398                         current_tpt = lq_sta->last_tpt;
2399
2400                         /* Need to set up a new rate table in uCode */
2401                         update_lq = 1;
2402                 }
2403
2404                 /* Either way, we've made a decision; modulation mode
2405                  * search is done, allow rate adjustment next time. */
2406                 lq_sta->search_better_tbl = 0;
2407                 done_search = 1;        /* Don't switch modes below! */
2408                 goto lq_update;
2409         }
2410
2411         /* (Else) not in search of better modulation mode, try for better
2412          * starting rate, while staying in this mode. */
2413         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2414         low = high_low & 0xff;
2415         high = (high_low >> 8) & 0xff;
2416
2417         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2418
2419         sr = window->success_ratio;
2420
2421         /* Collect measured throughputs for current and adjacent rates */
2422         current_tpt = window->average_tpt;
2423         if (low != IWL_RATE_INVALID)
2424                 low_tpt = tbl->win[low].average_tpt;
2425         if (high != IWL_RATE_INVALID)
2426                 high_tpt = tbl->win[high].average_tpt;
2427
2428         IWL_DEBUG_RATE(mvm,
2429                        "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2430                        rs_pretty_rate(rate), current_tpt, sr,
2431                        low, high, low_tpt, high_tpt);
2432
2433         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2434                                           current_tpt, low_tpt, high_tpt);
2435
2436         /* Force a search in case BT doesn't like us being in MIMO */
2437         if (is_mimo(rate) &&
2438             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2439                 IWL_DEBUG_RATE(mvm,
2440                                "BT Coex forbids MIMO. Search for new config\n");
2441                 rs_stay_in_table(lq_sta, true);
2442                 goto lq_update;
2443         }
2444
2445         switch (scale_action) {
2446         case RS_ACTION_DOWNSCALE:
2447                 /* Decrease starting rate, update uCode's rate table */
2448                 if (low != IWL_RATE_INVALID) {
2449                         update_lq = 1;
2450                         index = low;
2451                 } else {
2452                         IWL_DEBUG_RATE(mvm,
2453                                        "At the bottom rate. Can't decrease\n");
2454                 }
2455
2456                 break;
2457         case RS_ACTION_UPSCALE:
2458                 /* Increase starting rate, update uCode's rate table */
2459                 if (high != IWL_RATE_INVALID) {
2460                         update_lq = 1;
2461                         index = high;
2462                 } else {
2463                         IWL_DEBUG_RATE(mvm,
2464                                        "At the top rate. Can't increase\n");
2465                 }
2466
2467                 break;
2468         case RS_ACTION_STAY:
2469                 /* No change */
2470                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2471                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2472                 break;
2473         default:
2474                 break;
2475         }
2476
2477 lq_update:
2478         /* Replace uCode's rate table for the destination station. */
2479         if (update_lq) {
2480                 tbl->rate.index = index;
2481                 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2482                         rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2483                 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2484                 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2485         }
2486
2487         rs_stay_in_table(lq_sta, false);
2488
2489         /*
2490          * Search for new modulation mode if we're:
2491          * 1)  Not changing rates right now
2492          * 2)  Not just finishing up a search
2493          * 3)  Allowing a new search
2494          */
2495         if (!update_lq && !done_search &&
2496             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2497             && window->counter) {
2498                 enum rs_column next_column;
2499
2500                 /* Save current throughput to compare with "search" throughput*/
2501                 lq_sta->last_tpt = current_tpt;
2502
2503                 IWL_DEBUG_RATE(mvm,
2504                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2505                                update_lq, done_search, lq_sta->rs_state,
2506                                window->counter);
2507
2508                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2509                 if (next_column != RS_COLUMN_INVALID) {
2510                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2511                                                       next_column);
2512                         if (!ret)
2513                                 lq_sta->search_better_tbl = 1;
2514                 } else {
2515                         IWL_DEBUG_RATE(mvm,
2516                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2517                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2518                 }
2519
2520                 /* If new "search" mode was selected, set up in uCode table */
2521                 if (lq_sta->search_better_tbl) {
2522                         /* Access the "search" table, clear its history. */
2523                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2524                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2525
2526                         /* Use new "search" start rate */
2527                         index = tbl->rate.index;
2528
2529                         rs_dump_rate(mvm, &tbl->rate,
2530                                      "Switch to SEARCH TABLE:");
2531                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2532                 } else {
2533                         done_search = 1;
2534                 }
2535         }
2536
2537         if (!ndp)
2538                 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2539
2540         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2541                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2542                 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2543         }
2544 }
2545
2546 struct rs_init_rate_info {
2547         s8 rssi;
2548         u8 rate_idx;
2549 };
2550
2551 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2552         { -60, IWL_RATE_54M_INDEX },
2553         { -64, IWL_RATE_48M_INDEX },
2554         { -68, IWL_RATE_36M_INDEX },
2555         { -80, IWL_RATE_24M_INDEX },
2556         { -84, IWL_RATE_18M_INDEX },
2557         { -85, IWL_RATE_12M_INDEX },
2558         { -86, IWL_RATE_11M_INDEX },
2559         { -88, IWL_RATE_5M_INDEX  },
2560         { -90, IWL_RATE_2M_INDEX  },
2561         { S8_MIN, IWL_RATE_1M_INDEX },
2562 };
2563
2564 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2565         { -60, IWL_RATE_54M_INDEX },
2566         { -64, IWL_RATE_48M_INDEX },
2567         { -72, IWL_RATE_36M_INDEX },
2568         { -80, IWL_RATE_24M_INDEX },
2569         { -84, IWL_RATE_18M_INDEX },
2570         { -85, IWL_RATE_12M_INDEX },
2571         { -87, IWL_RATE_9M_INDEX  },
2572         { S8_MIN, IWL_RATE_6M_INDEX },
2573 };
2574
2575 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2576         { -60, IWL_RATE_MCS_7_INDEX },
2577         { -64, IWL_RATE_MCS_6_INDEX },
2578         { -68, IWL_RATE_MCS_5_INDEX },
2579         { -72, IWL_RATE_MCS_4_INDEX },
2580         { -80, IWL_RATE_MCS_3_INDEX },
2581         { -84, IWL_RATE_MCS_2_INDEX },
2582         { -85, IWL_RATE_MCS_1_INDEX },
2583         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2584 };
2585
2586 /* MCS index 9 is not valid for 20MHz VHT channel width,
2587  * but is ok for 40, 80 and 160MHz channels.
2588  */
2589 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2590         { -60, IWL_RATE_MCS_8_INDEX },
2591         { -64, IWL_RATE_MCS_7_INDEX },
2592         { -68, IWL_RATE_MCS_6_INDEX },
2593         { -72, IWL_RATE_MCS_5_INDEX },
2594         { -80, IWL_RATE_MCS_4_INDEX },
2595         { -84, IWL_RATE_MCS_3_INDEX },
2596         { -85, IWL_RATE_MCS_2_INDEX },
2597         { -87, IWL_RATE_MCS_1_INDEX },
2598         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2599 };
2600
2601 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2602         { -60, IWL_RATE_MCS_9_INDEX },
2603         { -64, IWL_RATE_MCS_8_INDEX },
2604         { -68, IWL_RATE_MCS_7_INDEX },
2605         { -72, IWL_RATE_MCS_6_INDEX },
2606         { -80, IWL_RATE_MCS_5_INDEX },
2607         { -84, IWL_RATE_MCS_4_INDEX },
2608         { -85, IWL_RATE_MCS_3_INDEX },
2609         { -87, IWL_RATE_MCS_2_INDEX },
2610         { -88, IWL_RATE_MCS_1_INDEX },
2611         { S8_MIN, IWL_RATE_MCS_0_INDEX },
2612 };
2613
2614 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2615
2616 /* Init the optimal rate based on STA caps
2617  * This combined with rssi is used to report the last tx rate
2618  * to userspace when we haven't transmitted enough frames.
2619  */
2620 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2621                                  struct ieee80211_sta *sta,
2622                                  struct iwl_lq_sta *lq_sta)
2623 {
2624         struct rs_rate *rate = &lq_sta->optimal_rate;
2625
2626         if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2627                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2628         else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2629                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2630         else if (lq_sta->band == NL80211_BAND_5GHZ)
2631                 rate->type = LQ_LEGACY_A;
2632         else
2633                 rate->type = LQ_LEGACY_G;
2634
2635         rate->bw = rs_bw_from_sta_bw(sta);
2636         rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2637
2638         /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2639
2640         if (is_mimo(rate)) {
2641                 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2642         } else if (is_siso(rate)) {
2643                 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2644         } else {
2645                 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2646
2647                 if (lq_sta->band == NL80211_BAND_5GHZ) {
2648                         lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2649                         lq_sta->optimal_nentries =
2650                                 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2651                 } else {
2652                         lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2653                         lq_sta->optimal_nentries =
2654                                 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2655                 }
2656         }
2657
2658         if (is_vht(rate)) {
2659                 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2660                         lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2661                         lq_sta->optimal_nentries =
2662                                 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2663                 } else {
2664                         lq_sta->optimal_rates = rs_optimal_rates_vht;
2665                         lq_sta->optimal_nentries =
2666                                 ARRAY_SIZE(rs_optimal_rates_vht);
2667                 }
2668         } else if (is_ht(rate)) {
2669                 lq_sta->optimal_rates = rs_optimal_rates_ht;
2670                 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2671         }
2672 }
2673
2674 /* Compute the optimal rate index based on RSSI */
2675 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2676                                            struct iwl_lq_sta *lq_sta)
2677 {
2678         struct rs_rate *rate = &lq_sta->optimal_rate;
2679         int i;
2680
2681         rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2682                                      BITS_PER_LONG);
2683
2684         for (i = 0; i < lq_sta->optimal_nentries; i++) {
2685                 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2686
2687                 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2688                     (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2689                         rate->index = rate_idx;
2690                         break;
2691                 }
2692         }
2693
2694         return rate;
2695 }
2696
2697 /* Choose an initial legacy rate and antenna to use based on the RSSI
2698  * of last Rx
2699  */
2700 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2701                                 struct ieee80211_sta *sta,
2702                                 struct iwl_lq_sta *lq_sta,
2703                                 enum nl80211_band band,
2704                                 struct rs_rate *rate,
2705                                 bool init)
2706 {
2707         int i, nentries;
2708         unsigned long active_rate;
2709         s8 best_rssi = S8_MIN;
2710         u8 best_ant = ANT_NONE;
2711         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2712         const struct rs_init_rate_info *initial_rates;
2713
2714         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2715                 if (!(lq_sta->pers.chains & BIT(i)))
2716                         continue;
2717
2718                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2719                         best_rssi = lq_sta->pers.chain_signal[i];
2720                         best_ant = BIT(i);
2721                 }
2722         }
2723
2724         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2725                        rs_pretty_ant(best_ant), best_rssi);
2726
2727         if (best_ant != ANT_A && best_ant != ANT_B)
2728                 rate->ant = first_antenna(valid_tx_ant);
2729         else
2730                 rate->ant = best_ant;
2731
2732         rate->sgi = false;
2733         rate->ldpc = false;
2734         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2735
2736         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2737                                      BITS_PER_LONG);
2738
2739         if (band == NL80211_BAND_5GHZ) {
2740                 rate->type = LQ_LEGACY_A;
2741                 initial_rates = rs_optimal_rates_5ghz_legacy;
2742                 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2743         } else {
2744                 rate->type = LQ_LEGACY_G;
2745                 initial_rates = rs_optimal_rates_24ghz_legacy;
2746                 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2747         }
2748
2749         if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2750                 goto out;
2751
2752         /* Start from a higher rate if the corresponding debug capability
2753          * is enabled. The rate is chosen according to AP capabilities.
2754          * In case of VHT/HT when the rssi is low fallback to the case of
2755          * legacy rates.
2756          */
2757         if (sta->vht_cap.vht_supported &&
2758             best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2759                 /*
2760                  * In AP mode, when a new station associates, rs is initialized
2761                  * immediately upon association completion, before the phy
2762                  * context is updated with the association parameters, so the
2763                  * sta bandwidth might be wider than the phy context allows.
2764                  * To avoid this issue, always initialize rs with 20mhz
2765                  * bandwidth rate, and after authorization, when the phy context
2766                  * is already up-to-date, re-init rs with the correct bw.
2767                  */
2768                 u32 bw = init ? RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2769
2770                 switch (bw) {
2771                 case RATE_MCS_CHAN_WIDTH_40:
2772                 case RATE_MCS_CHAN_WIDTH_80:
2773                 case RATE_MCS_CHAN_WIDTH_160:
2774                         initial_rates = rs_optimal_rates_vht;
2775                         nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2776                         break;
2777                 case RATE_MCS_CHAN_WIDTH_20:
2778                         initial_rates = rs_optimal_rates_vht_20mhz;
2779                         nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2780                         break;
2781                 default:
2782                         IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2783                         goto out;
2784                 }
2785
2786                 active_rate = lq_sta->active_siso_rate;
2787                 rate->type = LQ_VHT_SISO;
2788                 rate->bw = bw;
2789         } else if (sta->ht_cap.ht_supported &&
2790                    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2791                 initial_rates = rs_optimal_rates_ht;
2792                 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2793                 active_rate = lq_sta->active_siso_rate;
2794                 rate->type = LQ_HT_SISO;
2795         } else {
2796                 active_rate = lq_sta->active_legacy_rate;
2797         }
2798
2799         for (i = 0; i < nentries; i++) {
2800                 int rate_idx = initial_rates[i].rate_idx;
2801
2802                 if ((best_rssi >= initial_rates[i].rssi) &&
2803                     (BIT(rate_idx) & active_rate)) {
2804                         rate->index = rate_idx;
2805                         break;
2806                 }
2807         }
2808
2809 out:
2810         rs_dump_rate(mvm, rate, "INITIAL");
2811 }
2812
2813 /* Save info about RSSI of last Rx */
2814 void rs_update_last_rssi(struct iwl_mvm *mvm,
2815                          struct iwl_lq_sta *lq_sta,
2816                          struct ieee80211_rx_status *rx_status)
2817 {
2818         int i;
2819
2820         lq_sta->pers.chains = rx_status->chains;
2821         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2822         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2823         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2824         lq_sta->pers.last_rssi = S8_MIN;
2825
2826         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2827                 if (!(lq_sta->pers.chains & BIT(i)))
2828                         continue;
2829
2830                 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2831                         lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2832         }
2833 }
2834
2835 /**
2836  * rs_initialize_lq - Initialize a station's hardware rate table
2837  *
2838  * The uCode's station table contains a table of fallback rates
2839  * for automatic fallback during transmission.
2840  *
2841  * NOTE: This sets up a default set of values.  These will be replaced later
2842  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2843  *       rc80211_simple.
2844  *
2845  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2846  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2847  *       which requires station table entry to exist).
2848  */
2849 static void rs_initialize_lq(struct iwl_mvm *mvm,
2850                              struct ieee80211_sta *sta,
2851                              struct iwl_lq_sta *lq_sta,
2852                              enum nl80211_band band,
2853                              bool init)
2854 {
2855         struct iwl_scale_tbl_info *tbl;
2856         struct rs_rate *rate;
2857         u8 active_tbl = 0;
2858
2859         if (!sta || !lq_sta)
2860                 return;
2861
2862         if (!lq_sta->search_better_tbl)
2863                 active_tbl = lq_sta->active_tbl;
2864         else
2865                 active_tbl = 1 - lq_sta->active_tbl;
2866
2867         tbl = &(lq_sta->lq_info[active_tbl]);
2868         rate = &tbl->rate;
2869
2870         rs_get_initial_rate(mvm, sta, lq_sta, band, rate, init);
2871         rs_init_optimal_rate(mvm, sta, lq_sta);
2872
2873         WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2874                   "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2875                   rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2876                   mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2877
2878         tbl->column = rs_get_column_from_rate(rate);
2879
2880         rs_set_expected_tpt_table(lq_sta, tbl);
2881         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2882         /* TODO restore station should remember the lq cmd */
2883         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2884 }
2885
2886 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2887                         struct ieee80211_tx_rate_control *txrc)
2888 {
2889         struct sk_buff *skb = txrc->skb;
2890         struct iwl_op_mode *op_mode __maybe_unused =
2891                         (struct iwl_op_mode *)mvm_r;
2892         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2893         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2894         struct iwl_lq_sta *lq_sta = mvm_sta;
2895         struct rs_rate *optimal_rate;
2896         u32 last_ucode_rate;
2897
2898         if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2899                 /* if vif isn't initialized mvm doesn't know about
2900                  * this station, so don't do anything with the it
2901                  */
2902                 sta = NULL;
2903                 mvm_sta = NULL;
2904         }
2905
2906         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2907
2908         /* Treat uninitialized rate scaling data same as non-existing. */
2909         if (lq_sta && !lq_sta->pers.drv) {
2910                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2911                 mvm_sta = NULL;
2912         }
2913
2914         /* Send management frames and NO_ACK data using lowest rate. */
2915         if (rate_control_send_low(sta, mvm_sta, txrc))
2916                 return;
2917
2918         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2919                                   info->band, &info->control.rates[0]);
2920         info->control.rates[0].count = 1;
2921
2922         /* Report the optimal rate based on rssi and STA caps if we haven't
2923          * converged yet (too little traffic) or exploring other modulations
2924          */
2925         if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2926                 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2927                 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2928                                                           optimal_rate);
2929                 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2930                                           &txrc->reported_rate);
2931         }
2932 }
2933
2934 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2935                           gfp_t gfp)
2936 {
2937         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2938         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2939         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2940         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
2941
2942         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2943
2944         lq_sta->pers.drv = mvm;
2945 #ifdef CONFIG_MAC80211_DEBUGFS
2946         lq_sta->pers.dbg_fixed_rate = 0;
2947         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2948         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2949 #endif
2950         lq_sta->pers.chains = 0;
2951         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2952         lq_sta->pers.last_rssi = S8_MIN;
2953
2954         return &mvmsta->lq_sta;
2955 }
2956
2957 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2958                                        int nss)
2959 {
2960         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2961                 (0x3 << (2 * (nss - 1)));
2962         rx_mcs >>= (2 * (nss - 1));
2963
2964         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2965                 return IWL_RATE_MCS_7_INDEX;
2966         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2967                 return IWL_RATE_MCS_8_INDEX;
2968         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2969                 return IWL_RATE_MCS_9_INDEX;
2970
2971         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2972         return -1;
2973 }
2974
2975 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2976                                      struct ieee80211_sta_vht_cap *vht_cap,
2977                                      struct iwl_lq_sta *lq_sta)
2978 {
2979         int i;
2980         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2981
2982         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2983                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2984                         if (i == IWL_RATE_9M_INDEX)
2985                                 continue;
2986
2987                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2988                         if (i == IWL_RATE_MCS_9_INDEX &&
2989                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2990                                 continue;
2991
2992                         lq_sta->active_siso_rate |= BIT(i);
2993                 }
2994         }
2995
2996         if (sta->rx_nss < 2)
2997                 return;
2998
2999         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
3000         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
3001                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
3002                         if (i == IWL_RATE_9M_INDEX)
3003                                 continue;
3004
3005                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
3006                         if (i == IWL_RATE_MCS_9_INDEX &&
3007                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
3008                                 continue;
3009
3010                         lq_sta->active_mimo2_rate |= BIT(i);
3011                 }
3012         }
3013 }
3014
3015 static void rs_ht_init(struct iwl_mvm *mvm,
3016                        struct ieee80211_sta *sta,
3017                        struct iwl_lq_sta *lq_sta,
3018                        struct ieee80211_sta_ht_cap *ht_cap)
3019 {
3020         /* active_siso_rate mask includes 9 MBits (bit 5),
3021          * and CCK (bits 0-3), supp_rates[] does not;
3022          * shift to convert format, force 9 MBits off.
3023          */
3024         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
3025         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
3026         lq_sta->active_siso_rate &= ~((u16)0x2);
3027         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
3028
3029         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
3030         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
3031         lq_sta->active_mimo2_rate &= ~((u16)0x2);
3032         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
3033
3034         if (mvm->cfg->ht_params->ldpc &&
3035             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
3036                 lq_sta->ldpc = true;
3037
3038         if (mvm->cfg->ht_params->stbc &&
3039             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3040             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3041                 lq_sta->stbc_capable = true;
3042
3043         lq_sta->is_vht = false;
3044 }
3045
3046 static void rs_vht_init(struct iwl_mvm *mvm,
3047                         struct ieee80211_sta *sta,
3048                         struct iwl_lq_sta *lq_sta,
3049                         struct ieee80211_sta_vht_cap *vht_cap)
3050 {
3051         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
3052
3053         if (mvm->cfg->ht_params->ldpc &&
3054             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3055                 lq_sta->ldpc = true;
3056
3057         if (mvm->cfg->ht_params->stbc &&
3058             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3059             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3060                 lq_sta->stbc_capable = true;
3061
3062         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3063             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3064             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3065                 lq_sta->bfer_capable = true;
3066
3067         lq_sta->is_vht = true;
3068 }
3069
3070 #ifdef CONFIG_IWLWIFI_DEBUGFS
3071 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3072 {
3073         spin_lock_bh(&mvm->drv_stats_lock);
3074         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3075         spin_unlock_bh(&mvm->drv_stats_lock);
3076 }
3077
3078 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3079 {
3080         u8 nss = 0;
3081
3082         spin_lock(&mvm->drv_stats_lock);
3083
3084         if (agg)
3085                 mvm->drv_rx_stats.agg_frames++;
3086
3087         mvm->drv_rx_stats.success_frames++;
3088
3089         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3090         case RATE_MCS_CHAN_WIDTH_20:
3091                 mvm->drv_rx_stats.bw_20_frames++;
3092                 break;
3093         case RATE_MCS_CHAN_WIDTH_40:
3094                 mvm->drv_rx_stats.bw_40_frames++;
3095                 break;
3096         case RATE_MCS_CHAN_WIDTH_80:
3097                 mvm->drv_rx_stats.bw_80_frames++;
3098                 break;
3099         case RATE_MCS_CHAN_WIDTH_160:
3100                 mvm->drv_rx_stats.bw_160_frames++;
3101                 break;
3102         default:
3103                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3104         }
3105
3106         if (rate & RATE_MCS_HT_MSK) {
3107                 mvm->drv_rx_stats.ht_frames++;
3108                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3109         } else if (rate & RATE_MCS_VHT_MSK) {
3110                 mvm->drv_rx_stats.vht_frames++;
3111                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3112                        RATE_VHT_MCS_NSS_POS) + 1;
3113         } else {
3114                 mvm->drv_rx_stats.legacy_frames++;
3115         }
3116
3117         if (nss == 1)
3118                 mvm->drv_rx_stats.siso_frames++;
3119         else if (nss == 2)
3120                 mvm->drv_rx_stats.mimo2_frames++;
3121
3122         if (rate & RATE_MCS_SGI_MSK)
3123                 mvm->drv_rx_stats.sgi_frames++;
3124         else
3125                 mvm->drv_rx_stats.ngi_frames++;
3126
3127         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3128         mvm->drv_rx_stats.last_frame_idx =
3129                 (mvm->drv_rx_stats.last_frame_idx + 1) %
3130                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3131
3132         spin_unlock(&mvm->drv_stats_lock);
3133 }
3134 #endif
3135
3136 /*
3137  * Called after adding a new station to initialize rate scaling
3138  */
3139 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3140                           enum nl80211_band band, bool init)
3141 {
3142         int i, j;
3143         struct ieee80211_hw *hw = mvm->hw;
3144         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3145         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3146         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3147         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
3148         struct ieee80211_supported_band *sband;
3149         unsigned long supp; /* must be unsigned long for for_each_set_bit */
3150
3151         /* clear all non-persistent lq data */
3152         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3153
3154         sband = hw->wiphy->bands[band];
3155
3156         lq_sta->lq.sta_id = mvmsta->sta_id;
3157         mvmsta->tlc_amsdu = false;
3158
3159         for (j = 0; j < LQ_SIZE; j++)
3160                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3161
3162         lq_sta->flush_timer = 0;
3163         lq_sta->last_tx = jiffies;
3164
3165         IWL_DEBUG_RATE(mvm,
3166                        "LQ: *** rate scale station global init for station %d ***\n",
3167                        mvmsta->sta_id);
3168         /* TODO: what is a good starting rate for STA? About middle? Maybe not
3169          * the lowest or the highest rate.. Could consider using RSSI from
3170          * previous packets? Need to have IEEE 802.1X auth succeed immediately
3171          * after assoc.. */
3172
3173         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3174         lq_sta->band = sband->band;
3175         /*
3176          * active legacy rates as per supported rates bitmap
3177          */
3178         supp = sta->supp_rates[sband->band];
3179         lq_sta->active_legacy_rate = 0;
3180         for_each_set_bit(i, &supp, BITS_PER_LONG)
3181                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3182
3183         /* TODO: should probably account for rx_highest for both HT/VHT */
3184         if (!vht_cap || !vht_cap->vht_supported)
3185                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3186         else
3187                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3188
3189         lq_sta->max_legacy_rate_idx =
3190                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3191         lq_sta->max_siso_rate_idx =
3192                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3193         lq_sta->max_mimo2_rate_idx =
3194                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3195
3196         IWL_DEBUG_RATE(mvm,
3197                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3198                        lq_sta->active_legacy_rate,
3199                        lq_sta->active_siso_rate,
3200                        lq_sta->active_mimo2_rate,
3201                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3202                        lq_sta->bfer_capable);
3203         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3204                        lq_sta->max_legacy_rate_idx,
3205                        lq_sta->max_siso_rate_idx,
3206                        lq_sta->max_mimo2_rate_idx);
3207
3208         /* These values will be overridden later */
3209         lq_sta->lq.single_stream_ant_msk =
3210                 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3211         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3212
3213         /* as default allow aggregation for all tids */
3214         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3215         lq_sta->is_agg = 0;
3216 #ifdef CONFIG_IWLWIFI_DEBUGFS
3217         iwl_mvm_reset_frame_stats(mvm);
3218 #endif
3219         rs_initialize_lq(mvm, sta, lq_sta, band, init);
3220 }
3221
3222 static void rs_rate_update(void *mvm_r,
3223                            struct ieee80211_supported_band *sband,
3224                            struct cfg80211_chan_def *chandef,
3225                            struct ieee80211_sta *sta, void *priv_sta,
3226                            u32 changed)
3227 {
3228         u8 tid;
3229         struct iwl_op_mode *op_mode  =
3230                         (struct iwl_op_mode *)mvm_r;
3231         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3232
3233         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3234                 return;
3235
3236         /* Stop any ongoing aggregations as rs starts off assuming no agg */
3237         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3238                 ieee80211_stop_tx_ba_session(sta, tid);
3239
3240         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3241 }
3242
3243 #ifdef CONFIG_MAC80211_DEBUGFS
3244 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3245                                             struct iwl_lq_cmd *lq_cmd,
3246                                             enum nl80211_band band,
3247                                             u32 ucode_rate)
3248 {
3249         struct rs_rate rate;
3250         int i;
3251         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3252         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3253         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3254
3255         for (i = 0; i < num_rates; i++)
3256                 lq_cmd->rs_table[i] = ucode_rate_le32;
3257
3258         if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3259                 WARN_ON_ONCE(1);
3260                 return;
3261         }
3262
3263         if (is_mimo(&rate))
3264                 lq_cmd->mimo_delim = num_rates - 1;
3265         else
3266                 lq_cmd->mimo_delim = 0;
3267
3268         lq_cmd->reduced_tpc = 0;
3269
3270         if (num_of_ant(ant) == 1)
3271                 lq_cmd->single_stream_ant_msk = ant;
3272
3273         if (!mvm->trans->cfg->gen2)
3274                 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3275         else
3276                 lq_cmd->agg_frame_cnt_limit =
3277                         LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3278 }
3279 #endif /* CONFIG_MAC80211_DEBUGFS */
3280
3281 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3282                                      struct iwl_lq_sta *lq_sta,
3283                                      struct rs_rate *rate,
3284                                      __le32 *rs_table, int *rs_table_index,
3285                                      int num_rates, int num_retries,
3286                                      u8 valid_tx_ant, bool toggle_ant)
3287 {
3288         int i, j;
3289         __le32 ucode_rate;
3290         bool bottom_reached = false;
3291         int prev_rate_idx = rate->index;
3292         int end = LINK_QUAL_MAX_RETRY_NUM;
3293         int index = *rs_table_index;
3294
3295         for (i = 0; i < num_rates && index < end; i++) {
3296                 for (j = 0; j < num_retries && index < end; j++, index++) {
3297                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3298                                                                          rate));
3299                         rs_table[index] = ucode_rate;
3300                         if (toggle_ant)
3301                                 rs_toggle_antenna(valid_tx_ant, rate);
3302                 }
3303
3304                 prev_rate_idx = rate->index;
3305                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3306                 if (bottom_reached && !is_legacy(rate))
3307                         break;
3308         }
3309
3310         if (!bottom_reached && !is_legacy(rate))
3311                 rate->index = prev_rate_idx;
3312
3313         *rs_table_index = index;
3314 }
3315
3316 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3317  * column the rate table should look like this:
3318  *
3319  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3320  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3321  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3322  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3323  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3324  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3325  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3326  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3327  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3328  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3329  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3330  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3331  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3332  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3333  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3334  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3335  */
3336 static void rs_build_rates_table(struct iwl_mvm *mvm,
3337                                  struct ieee80211_sta *sta,
3338                                  struct iwl_lq_sta *lq_sta,
3339                                  const struct rs_rate *initial_rate)
3340 {
3341         struct rs_rate rate;
3342         int num_rates, num_retries, index = 0;
3343         u8 valid_tx_ant = 0;
3344         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3345         bool toggle_ant = false;
3346         u32 color;
3347
3348         memcpy(&rate, initial_rate, sizeof(rate));
3349
3350         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3351
3352         /* TODO: remove old API when min FW API hits 14 */
3353         if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3354             rs_stbc_allow(mvm, sta, lq_sta))
3355                 rate.stbc = true;
3356
3357         if (is_siso(&rate)) {
3358                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3359                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3360         } else if (is_mimo(&rate)) {
3361                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3362                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3363         } else {
3364                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3365                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3366                 toggle_ant = true;
3367         }
3368
3369         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3370                                  num_rates, num_retries, valid_tx_ant,
3371                                  toggle_ant);
3372
3373         rs_get_lower_rate_down_column(lq_sta, &rate);
3374
3375         if (is_siso(&rate)) {
3376                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3377                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3378                 lq_cmd->mimo_delim = index;
3379         } else if (is_legacy(&rate)) {
3380                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3381                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3382         } else {
3383                 WARN_ON_ONCE(1);
3384         }
3385
3386         toggle_ant = true;
3387
3388         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3389                                  num_rates, num_retries, valid_tx_ant,
3390                                  toggle_ant);
3391
3392         rs_get_lower_rate_down_column(lq_sta, &rate);
3393
3394         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3395         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3396
3397         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3398                                  num_rates, num_retries, valid_tx_ant,
3399                                  toggle_ant);
3400
3401         /* update the color of the LQ command (as a counter at bits 1-3) */
3402         color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3403         lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3404 }
3405
3406 struct rs_bfer_active_iter_data {
3407         struct ieee80211_sta *exclude_sta;
3408         struct iwl_mvm_sta *bfer_mvmsta;
3409 };
3410
3411 static void rs_bfer_active_iter(void *_data,
3412                                 struct ieee80211_sta *sta)
3413 {
3414         struct rs_bfer_active_iter_data *data = _data;
3415         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3416         struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3417         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3418
3419         if (sta == data->exclude_sta)
3420                 return;
3421
3422         /* The current sta has BFER allowed */
3423         if (ss_params & LQ_SS_BFER_ALLOWED) {
3424                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3425
3426                 data->bfer_mvmsta = mvmsta;
3427         }
3428 }
3429
3430 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3431 {
3432         int prio = -1;
3433         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3434
3435         switch (viftype) {
3436         case NL80211_IFTYPE_AP:
3437         case NL80211_IFTYPE_P2P_GO:
3438                 prio = 3;
3439                 break;
3440         case NL80211_IFTYPE_P2P_CLIENT:
3441                 prio = 2;
3442                 break;
3443         case NL80211_IFTYPE_STATION:
3444                 prio = 1;
3445                 break;
3446         default:
3447                 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3448                 prio = -1;
3449         }
3450
3451         return prio;
3452 }
3453
3454 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3455 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3456                                 struct iwl_mvm_sta *sta2)
3457 {
3458         int prio1 = rs_bfer_priority(sta1);
3459         int prio2 = rs_bfer_priority(sta2);
3460
3461         if (prio1 > prio2)
3462                 return 1;
3463         if (prio1 < prio2)
3464                 return -1;
3465         return 0;
3466 }
3467
3468 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3469                                 struct ieee80211_sta *sta,
3470                                 struct iwl_lq_sta *lq_sta,
3471                                 const struct rs_rate *initial_rate)
3472 {
3473         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3474         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3475         struct rs_bfer_active_iter_data data = {
3476                 .exclude_sta = sta,
3477                 .bfer_mvmsta = NULL,
3478         };
3479         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3480         u32 ss_params = LQ_SS_PARAMS_VALID;
3481
3482         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3483                 goto out;
3484
3485 #ifdef CONFIG_MAC80211_DEBUGFS
3486         /* Check if forcing the decision is configured.
3487          * Note that SISO is forced by not allowing STBC or BFER
3488          */
3489         if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3490                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3491         else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3492                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3493
3494         if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3495                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3496                                lq_sta->pers.ss_force);
3497                 goto out;
3498         }
3499 #endif
3500
3501         if (lq_sta->stbc_capable)
3502                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3503
3504         if (!lq_sta->bfer_capable)
3505                 goto out;
3506
3507         ieee80211_iterate_stations_atomic(mvm->hw,
3508                                           rs_bfer_active_iter,
3509                                           &data);
3510         bfer_mvmsta = data.bfer_mvmsta;
3511
3512         /* This code is safe as it doesn't run concurrently for different
3513          * stations. This is guaranteed by the fact that calls to
3514          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3515          */
3516         if (!bfer_mvmsta) {
3517                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3518
3519                 ss_params |= LQ_SS_BFER_ALLOWED;
3520                 goto out;
3521         }
3522
3523         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3524                        bfer_mvmsta->sta_id);
3525
3526         /* Disallow BFER on another STA if active and we're a higher priority */
3527         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3528                 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3529                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3530
3531                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3532                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3533                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3534
3535                 ss_params |= LQ_SS_BFER_ALLOWED;
3536                 IWL_DEBUG_RATE(mvm,
3537                                "Lower priority BFER sta found (%d). Switch BFER\n",
3538                                bfer_mvmsta->sta_id);
3539         }
3540 out:
3541         lq_cmd->ss_params = cpu_to_le32(ss_params);
3542 }
3543
3544 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3545                            struct ieee80211_sta *sta,
3546                            struct iwl_lq_sta *lq_sta,
3547                            const struct rs_rate *initial_rate)
3548 {
3549         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3550         struct iwl_mvm_sta *mvmsta;
3551         struct iwl_mvm_vif *mvmvif;
3552
3553         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3554         lq_cmd->agg_time_limit =
3555                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3556
3557 #ifdef CONFIG_MAC80211_DEBUGFS
3558         if (lq_sta->pers.dbg_fixed_rate) {
3559                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3560                                                 lq_sta->band,
3561                                                 lq_sta->pers.dbg_fixed_rate);
3562                 return;
3563         }
3564 #endif
3565         if (WARN_ON_ONCE(!sta || !initial_rate))
3566                 return;
3567
3568         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3569
3570         if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3571                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3572
3573         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3574         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3575
3576         if (num_of_ant(initial_rate->ant) == 1)
3577                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3578
3579         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3580
3581         /*
3582          * In case of low latency, tell the firmware to leave a frame in the
3583          * Tx Fifo so that it can start a transaction in the same TxOP. This
3584          * basically allows the firmware to send bursts.
3585          */
3586         if (iwl_mvm_vif_low_latency(mvmvif))
3587                 lq_cmd->agg_frame_cnt_limit--;
3588
3589         if (mvmsta->vif->p2p)
3590                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3591
3592         lq_cmd->agg_time_limit =
3593                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3594 }
3595
3596 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3597 {
3598         return hw->priv;
3599 }
3600 /* rate scale requires free function to be implemented */
3601 static void rs_free(void *mvm_rate)
3602 {
3603         return;
3604 }
3605
3606 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3607                         void *mvm_sta)
3608 {
3609         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3610         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3611
3612         IWL_DEBUG_RATE(mvm, "enter\n");
3613         IWL_DEBUG_RATE(mvm, "leave\n");
3614 }
3615
3616 #ifdef CONFIG_MAC80211_DEBUGFS
3617 int rs_pretty_print_rate(char *buf, const u32 rate)
3618 {
3619
3620         char *type, *bw;
3621         u8 mcs = 0, nss = 0;
3622         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3623
3624         if (!(rate & RATE_MCS_HT_MSK) &&
3625             !(rate & RATE_MCS_VHT_MSK)) {
3626                 int index = iwl_hwrate_to_plcp_idx(rate);
3627
3628                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3629                                rs_pretty_ant(ant),
3630                                index == IWL_RATE_INVALID ? "BAD" :
3631                                iwl_rate_mcs[index].mbps);
3632         }
3633
3634         if (rate & RATE_MCS_VHT_MSK) {
3635                 type = "VHT";
3636                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3637                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3638                        >> RATE_VHT_MCS_NSS_POS) + 1;
3639         } else if (rate & RATE_MCS_HT_MSK) {
3640                 type = "HT";
3641                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3642                 nss = ((rate & RATE_HT_MCS_NSS_MSK)
3643                        >> RATE_HT_MCS_NSS_POS) + 1;
3644         } else {
3645                 type = "Unknown"; /* shouldn't happen */
3646         }
3647
3648         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3649         case RATE_MCS_CHAN_WIDTH_20:
3650                 bw = "20Mhz";
3651                 break;
3652         case RATE_MCS_CHAN_WIDTH_40:
3653                 bw = "40Mhz";
3654                 break;
3655         case RATE_MCS_CHAN_WIDTH_80:
3656                 bw = "80Mhz";
3657                 break;
3658         case RATE_MCS_CHAN_WIDTH_160:
3659                 bw = "160Mhz";
3660                 break;
3661         default:
3662                 bw = "BAD BW";
3663         }
3664
3665         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n",
3666                        type, rs_pretty_ant(ant), bw, mcs, nss,
3667                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3668                        (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3669                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3670                        (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3671 }
3672
3673 /**
3674  * Program the device to use fixed rate for frame transmit
3675  * This is for debugging/testing only
3676  * once the device start use fixed rate, we need to reload the module
3677  * to being back the normal operation.
3678  */
3679 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3680                                 struct iwl_lq_sta *lq_sta)
3681 {
3682         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3683         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3684         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3685
3686         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3687                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3688
3689         if (lq_sta->pers.dbg_fixed_rate) {
3690                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3691                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3692         }
3693 }
3694
3695 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3696                         const char __user *user_buf, size_t count, loff_t *ppos)
3697 {
3698         struct iwl_lq_sta *lq_sta = file->private_data;
3699         struct iwl_mvm *mvm;
3700         char buf[64];
3701         size_t buf_size;
3702         u32 parsed_rate;
3703
3704         mvm = lq_sta->pers.drv;
3705         memset(buf, 0, sizeof(buf));
3706         buf_size = min(count, sizeof(buf) -  1);
3707         if (copy_from_user(buf, user_buf, buf_size))
3708                 return -EFAULT;
3709
3710         if (sscanf(buf, "%x", &parsed_rate) == 1)
3711                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3712         else
3713                 lq_sta->pers.dbg_fixed_rate = 0;
3714
3715         rs_program_fix_rate(mvm, lq_sta);
3716
3717         return count;
3718 }
3719
3720 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3721                         char __user *user_buf, size_t count, loff_t *ppos)
3722 {
3723         char *buff;
3724         int desc = 0;
3725         int i = 0;
3726         ssize_t ret;
3727
3728         struct iwl_lq_sta *lq_sta = file->private_data;
3729         struct iwl_mvm_sta *mvmsta =
3730                 container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3731         struct iwl_mvm *mvm;
3732         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3733         struct rs_rate *rate = &tbl->rate;
3734         u32 ss_params;
3735
3736         mvm = lq_sta->pers.drv;
3737         buff = kmalloc(2048, GFP_KERNEL);
3738         if (!buff)
3739                 return -ENOMEM;
3740
3741         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3742         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3743                         lq_sta->total_failed, lq_sta->total_success,
3744                         lq_sta->active_legacy_rate);
3745         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3746                         lq_sta->pers.dbg_fixed_rate);
3747         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3748             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3749             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3750             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3751         desc += sprintf(buff+desc, "lq type %s\n",
3752                         (is_legacy(rate)) ? "legacy" :
3753                         is_vht(rate) ? "VHT" : "HT");
3754         if (!is_legacy(rate)) {
3755                 desc += sprintf(buff + desc, " %s",
3756                    (is_siso(rate)) ? "SISO" : "MIMO2");
3757                 desc += sprintf(buff + desc, " %s",
3758                                 (is_ht20(rate)) ? "20MHz" :
3759                                 (is_ht40(rate)) ? "40MHz" :
3760                                 (is_ht80(rate)) ? "80MHz" :
3761                                 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3762                 desc += sprintf(buff + desc, " %s %s %s %s\n",
3763                                 (rate->sgi) ? "SGI" : "NGI",
3764                                 (rate->ldpc) ? "LDPC" : "BCC",
3765                                 (lq_sta->is_agg) ? "AGG on" : "",
3766                                 (mvmsta->tlc_amsdu) ? "AMSDU on" : "");
3767         }
3768         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3769                         lq_sta->last_rate_n_flags);
3770         desc += sprintf(buff+desc,
3771                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3772                         lq_sta->lq.flags,
3773                         lq_sta->lq.mimo_delim,
3774                         lq_sta->lq.single_stream_ant_msk,
3775                         lq_sta->lq.dual_stream_ant_msk);
3776
3777         desc += sprintf(buff+desc,
3778                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3779                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3780                         lq_sta->lq.agg_disable_start_th,
3781                         lq_sta->lq.agg_frame_cnt_limit);
3782
3783         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3784         ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3785         desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3786                         (ss_params & LQ_SS_PARAMS_VALID) ?
3787                         "VALID" : "INVALID",
3788                         (ss_params & LQ_SS_BFER_ALLOWED) ?
3789                         ", BFER" : "",
3790                         (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3791                         ", STBC" : "",
3792                         (ss_params & LQ_SS_FORCE) ?
3793                         ", FORCE" : "");
3794         desc += sprintf(buff+desc,
3795                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3796                         lq_sta->lq.initial_rate_index[0],
3797                         lq_sta->lq.initial_rate_index[1],
3798                         lq_sta->lq.initial_rate_index[2],
3799                         lq_sta->lq.initial_rate_index[3]);
3800
3801         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3802                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3803
3804                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3805                 desc += rs_pretty_print_rate(buff+desc, r);
3806         }
3807
3808         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3809         kfree(buff);
3810         return ret;
3811 }
3812
3813 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3814         .write = rs_sta_dbgfs_scale_table_write,
3815         .read = rs_sta_dbgfs_scale_table_read,
3816         .open = simple_open,
3817         .llseek = default_llseek,
3818 };
3819 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3820                         char __user *user_buf, size_t count, loff_t *ppos)
3821 {
3822         char *buff;
3823         int desc = 0;
3824         int i, j;
3825         ssize_t ret;
3826         struct iwl_scale_tbl_info *tbl;
3827         struct rs_rate *rate;
3828         struct iwl_lq_sta *lq_sta = file->private_data;
3829
3830         buff = kmalloc(1024, GFP_KERNEL);
3831         if (!buff)
3832                 return -ENOMEM;
3833
3834         for (i = 0; i < LQ_SIZE; i++) {
3835                 tbl = &(lq_sta->lq_info[i]);
3836                 rate = &tbl->rate;
3837                 desc += sprintf(buff+desc,
3838                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3839                                 "index=%d\n",
3840                                 lq_sta->active_tbl == i ? "*" : "x",
3841                                 rate->type,
3842                                 rate->sgi,
3843                                 is_ht20(rate) ? "20MHz" :
3844                                 is_ht40(rate) ? "40MHz" :
3845                                 is_ht80(rate) ? "80MHz" :
3846                                 is_ht160(rate) ? "160MHz" : "ERR",
3847                                 rate->index);
3848                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3849                         desc += sprintf(buff+desc,
3850                                 "counter=%d success=%d %%=%d\n",
3851                                 tbl->win[j].counter,
3852                                 tbl->win[j].success_counter,
3853                                 tbl->win[j].success_ratio);
3854                 }
3855         }
3856         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3857         kfree(buff);
3858         return ret;
3859 }
3860
3861 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3862         .read = rs_sta_dbgfs_stats_table_read,
3863         .open = simple_open,
3864         .llseek = default_llseek,
3865 };
3866
3867 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3868                                               char __user *user_buf,
3869                                               size_t count, loff_t *ppos)
3870 {
3871         static const char * const column_name[] = {
3872                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3873                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3874                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3875                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3876                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3877                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3878                 [RS_COLUMN_MIMO2] = "MIMO2",
3879                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3880         };
3881
3882         static const char * const rate_name[] = {
3883                 [IWL_RATE_1M_INDEX] = "1M",
3884                 [IWL_RATE_2M_INDEX] = "2M",
3885                 [IWL_RATE_5M_INDEX] = "5.5M",
3886                 [IWL_RATE_11M_INDEX] = "11M",
3887                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3888                 [IWL_RATE_9M_INDEX] = "9M",
3889                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3890                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3891                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3892                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3893                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3894                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3895                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3896                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3897                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3898         };
3899
3900         char *buff, *pos, *endpos;
3901         int col, rate;
3902         ssize_t ret;
3903         struct iwl_lq_sta *lq_sta = file->private_data;
3904         struct rs_rate_stats *stats;
3905         static const size_t bufsz = 1024;
3906
3907         buff = kmalloc(bufsz, GFP_KERNEL);
3908         if (!buff)
3909                 return -ENOMEM;
3910
3911         pos = buff;
3912         endpos = pos + bufsz;
3913
3914         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3915         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3916                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3917         pos += scnprintf(pos, endpos - pos, "\n");
3918
3919         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3920                 pos += scnprintf(pos, endpos - pos,
3921                                  "%s,", column_name[col]);
3922
3923                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3924                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3925                         pos += scnprintf(pos, endpos - pos,
3926                                          "%llu/%llu,",
3927                                          stats->success,
3928                                          stats->total);
3929                 }
3930                 pos += scnprintf(pos, endpos - pos, "\n");
3931         }
3932
3933         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3934         kfree(buff);
3935         return ret;
3936 }
3937
3938 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3939                                                const char __user *user_buf,
3940                                                size_t count, loff_t *ppos)
3941 {
3942         struct iwl_lq_sta *lq_sta = file->private_data;
3943         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3944
3945         return count;
3946 }
3947
3948 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3949         .read = rs_sta_dbgfs_drv_tx_stats_read,
3950         .write = rs_sta_dbgfs_drv_tx_stats_write,
3951         .open = simple_open,
3952         .llseek = default_llseek,
3953 };
3954
3955 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3956                                        char __user *user_buf,
3957                                        size_t count, loff_t *ppos)
3958 {
3959         struct iwl_lq_sta *lq_sta = file->private_data;
3960         char buf[12];
3961         int bufsz = sizeof(buf);
3962         int pos = 0;
3963         static const char * const ss_force_name[] = {
3964                 [RS_SS_FORCE_NONE] = "none",
3965                 [RS_SS_FORCE_STBC] = "stbc",
3966                 [RS_SS_FORCE_BFER] = "bfer",
3967                 [RS_SS_FORCE_SISO] = "siso",
3968         };
3969
3970         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3971                          ss_force_name[lq_sta->pers.ss_force]);
3972         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3973 }
3974
3975 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3976                                         size_t count, loff_t *ppos)
3977 {
3978         struct iwl_mvm *mvm = lq_sta->pers.drv;
3979         int ret = 0;
3980
3981         if (!strncmp("none", buf, 4)) {
3982                 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3983         } else if (!strncmp("siso", buf, 4)) {
3984                 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3985         } else if (!strncmp("stbc", buf, 4)) {
3986                 if (lq_sta->stbc_capable) {
3987                         lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3988                 } else {
3989                         IWL_ERR(mvm,
3990                                 "can't force STBC. peer doesn't support\n");
3991                         ret = -EINVAL;
3992                 }
3993         } else if (!strncmp("bfer", buf, 4)) {
3994                 if (lq_sta->bfer_capable) {
3995                         lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3996                 } else {
3997                         IWL_ERR(mvm,
3998                                 "can't force BFER. peer doesn't support\n");
3999                         ret = -EINVAL;
4000                 }
4001         } else {
4002                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4003                 ret = -EINVAL;
4004         }
4005         return ret ?: count;
4006 }
4007
4008 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4009         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4010 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
4011                 if (!debugfs_create_file(#name, mode, parent, lq_sta,   \
4012                                          &iwl_dbgfs_##name##_ops))      \
4013                         goto err;                                       \
4014         } while (0)
4015
4016 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4017
4018 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
4019 {
4020         struct iwl_lq_sta *lq_sta = priv_sta;
4021         struct iwl_mvm_sta *mvmsta;
4022
4023         mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
4024
4025         if (!mvmsta->vif)
4026                 return;
4027
4028         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
4029                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
4030         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
4031                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
4032         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
4033                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4034         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
4035                           &lq_sta->tx_agg_tid_en);
4036         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
4037                           &lq_sta->pers.dbg_fixed_txp_reduction);
4038
4039         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
4040         return;
4041 err:
4042         IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
4043 }
4044
4045 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
4046 {
4047 }
4048 #endif
4049
4050 /*
4051  * Initialization of rate scaling information is done by driver after
4052  * the station is added. Since mac80211 calls this function before a
4053  * station is added we ignore it.
4054  */
4055 static void rs_rate_init_stub(void *mvm_r,
4056                               struct ieee80211_supported_band *sband,
4057                               struct cfg80211_chan_def *chandef,
4058                               struct ieee80211_sta *sta, void *mvm_sta)
4059 {
4060 }
4061
4062 static const struct rate_control_ops rs_mvm_ops = {
4063         .name = RS_NAME,
4064         .tx_status = rs_mac80211_tx_status,
4065         .get_rate = rs_get_rate,
4066         .rate_init = rs_rate_init_stub,
4067         .alloc = rs_alloc,
4068         .free = rs_free,
4069         .alloc_sta = rs_alloc_sta,
4070         .free_sta = rs_free_sta,
4071         .rate_update = rs_rate_update,
4072 #ifdef CONFIG_MAC80211_DEBUGFS
4073         .add_sta_debugfs = rs_add_debugfs,
4074         .remove_sta_debugfs = rs_remove_debugfs,
4075 #endif
4076 };
4077
4078 int iwl_mvm_rate_control_register(void)
4079 {
4080         return ieee80211_rate_control_register(&rs_mvm_ops);
4081 }
4082
4083 void iwl_mvm_rate_control_unregister(void)
4084 {
4085         ieee80211_rate_control_unregister(&rs_mvm_ops);
4086 }
4087
4088 /**
4089  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
4090  * Tx protection, according to this request and previous requests,
4091  * and send the LQ command.
4092  * @mvmsta: The station
4093  * @enable: Enable Tx protection?
4094  */
4095 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4096                           bool enable)
4097 {
4098         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
4099
4100         lockdep_assert_held(&mvm->mutex);
4101
4102         if (enable) {
4103                 if (mvmsta->tx_protection == 0)
4104                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
4105                 mvmsta->tx_protection++;
4106         } else {
4107                 mvmsta->tx_protection--;
4108                 if (mvmsta->tx_protection == 0)
4109                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4110         }
4111
4112         return iwl_mvm_send_lq_cmd(mvm, lq, false);
4113 }