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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
   4  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
   5  * Copyright(c) 2016 Intel Deutschland GmbH
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  * The full GNU General Public License is included in this distribution in the
  21  * file called LICENSE.
  22  *
  23  * Contact Information:
  24  *  Intel Linux Wireless <linuxwifi@intel.com>
  25  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26  *
  27  *****************************************************************************/
  28 #include <linux/kernel.h>
  29 #include <linux/skbuff.h>
  30 #include <linux/slab.h>
  31 #include <net/mac80211.h>
  32
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/delay.h>
  36
  37 #include <linux/workqueue.h>
  38 #include "rs.h"
  39 #include "fw-api.h"
  40 #include "sta.h"
  41 #include "iwl-op-mode.h"
  42 #include "mvm.h"
  43 #include "debugfs.h"
  44
  45 #define RS_NAME "iwl-mvm-rs"
  46
  47 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  48
  49 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
  50  * Use this macro when dealing with thresholds consts set as a percentage
  51  */
  52 #define RS_PERCENT(x) (128 * x)
  53
  54 static u8 rs_ht_to_legacy[] = {
  55         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  56         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  57         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  58         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  59         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  60         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  61         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  62         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  63         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  64         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  65 };
  66
  67 static const u8 ant_toggle_lookup[] = {
  68         [ANT_NONE] = ANT_NONE,
  69         [ANT_A] = ANT_B,
  70         [ANT_B] = ANT_C,
  71         [ANT_AB] = ANT_BC,
  72         [ANT_C] = ANT_A,
  73         [ANT_AC] = ANT_AB,
  74         [ANT_BC] = ANT_AC,
  75         [ANT_ABC] = ANT_ABC,
  76 };
  77
  78 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  79         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  80                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  81                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  82                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  83                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  84                                     IWL_RATE_##rp##M_INDEX,           \
  85                                     IWL_RATE_##rn##M_INDEX }
  86
  87 #define IWL_DECLARE_MCS_RATE(s)                                           \
  88         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
  89                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
  90                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
  91                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
  92                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
  93                                        IWL_RATE_INVM_INDEX,               \
  94                                        IWL_RATE_INVM_INDEX }
  95
  96 /*
  97  * Parameter order:
  98  *   rate, ht rate, prev rate, next rate
  99  *
 100  * If there isn't a valid next or previous rate then INV is used which
 101  * maps to IWL_RATE_INVALID
 102  *
 103  */
 104 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 105         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 106         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 107         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 108         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 109         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 110         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 111         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 112         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 113         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 114         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 115         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 116         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 117         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 118         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 119         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 120 };
 121
 122 enum rs_action {
 123         RS_ACTION_STAY = 0,
 124         RS_ACTION_DOWNSCALE = -1,
 125         RS_ACTION_UPSCALE = 1,
 126 };
 127
 128 enum rs_column_mode {
 129         RS_INVALID = 0,
 130         RS_LEGACY,
 131         RS_SISO,
 132         RS_MIMO2,
 133 };
 134
 135 #define MAX_NEXT_COLUMNS 7
 136 #define MAX_COLUMN_CHECKS 3
 137
 138 struct rs_tx_column;
 139
 140 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 141                                      struct ieee80211_sta *sta,
 142                                      struct rs_rate *rate,
 143                                      const struct rs_tx_column *next_col);
 144
 145 struct rs_tx_column {
 146         enum rs_column_mode mode;
 147         u8 ant;
 148         bool sgi;
 149         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 150         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 151 };
 152
 153 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 154                          struct rs_rate *rate,
 155                          const struct rs_tx_column *next_col)
 156 {
 157         return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
 158 }
 159
 160 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 161                           struct rs_rate *rate,
 162                           const struct rs_tx_column *next_col)
 163 {
 164         if (!sta->ht_cap.ht_supported)
 165                 return false;
 166
 167         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 168                 return false;
 169
 170         if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
 171                 return false;
 172
 173         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 174                 return false;
 175
 176         if (mvm->nvm_data->sku_cap_mimo_disabled)
 177                 return false;
 178
 179         return true;
 180 }
 181
 182 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 183                           struct rs_rate *rate,
 184                           const struct rs_tx_column *next_col)
 185 {
 186         if (!sta->ht_cap.ht_supported)
 187                 return false;
 188
 189         return true;
 190 }
 191
 192 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 193                          struct rs_rate *rate,
 194                          const struct rs_tx_column *next_col)
 195 {
 196         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 197         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 198
 199         if (is_ht20(rate) && (ht_cap->cap &
 200                              IEEE80211_HT_CAP_SGI_20))
 201                 return true;
 202         if (is_ht40(rate) && (ht_cap->cap &
 203                              IEEE80211_HT_CAP_SGI_40))
 204                 return true;
 205         if (is_ht80(rate) && (vht_cap->cap &
 206                              IEEE80211_VHT_CAP_SHORT_GI_80))
 207                 return true;
 208         if (is_ht160(rate) && (vht_cap->cap &
 209                              IEEE80211_VHT_CAP_SHORT_GI_160))
 210                 return true;
 211
 212         return false;
 213 }
 214
 215 static const struct rs_tx_column rs_tx_columns[] = {
 216         [RS_COLUMN_LEGACY_ANT_A] = {
 217                 .mode = RS_LEGACY,
 218                 .ant = ANT_A,
 219                 .next_columns = {
 220                         RS_COLUMN_LEGACY_ANT_B,
 221                         RS_COLUMN_SISO_ANT_A,
 222                         RS_COLUMN_MIMO2,
 223                         RS_COLUMN_INVALID,
 224                         RS_COLUMN_INVALID,
 225                         RS_COLUMN_INVALID,
 226                         RS_COLUMN_INVALID,
 227                 },
 228                 .checks = {
 229                         rs_ant_allow,
 230                 },
 231         },
 232         [RS_COLUMN_LEGACY_ANT_B] = {
 233                 .mode = RS_LEGACY,
 234                 .ant = ANT_B,
 235                 .next_columns = {
 236                         RS_COLUMN_LEGACY_ANT_A,
 237                         RS_COLUMN_SISO_ANT_B,
 238                         RS_COLUMN_MIMO2,
 239                         RS_COLUMN_INVALID,
 240                         RS_COLUMN_INVALID,
 241                         RS_COLUMN_INVALID,
 242                         RS_COLUMN_INVALID,
 243                 },
 244                 .checks = {
 245                         rs_ant_allow,
 246                 },
 247         },
 248         [RS_COLUMN_SISO_ANT_A] = {
 249                 .mode = RS_SISO,
 250                 .ant = ANT_A,
 251                 .next_columns = {
 252                         RS_COLUMN_SISO_ANT_B,
 253                         RS_COLUMN_MIMO2,
 254                         RS_COLUMN_SISO_ANT_A_SGI,
 255                         RS_COLUMN_LEGACY_ANT_A,
 256                         RS_COLUMN_LEGACY_ANT_B,
 257                         RS_COLUMN_INVALID,
 258                         RS_COLUMN_INVALID,
 259                 },
 260                 .checks = {
 261                         rs_siso_allow,
 262                         rs_ant_allow,
 263                 },
 264         },
 265         [RS_COLUMN_SISO_ANT_B] = {
 266                 .mode = RS_SISO,
 267                 .ant = ANT_B,
 268                 .next_columns = {
 269                         RS_COLUMN_SISO_ANT_A,
 270                         RS_COLUMN_MIMO2,
 271                         RS_COLUMN_SISO_ANT_B_SGI,
 272                         RS_COLUMN_LEGACY_ANT_A,
 273                         RS_COLUMN_LEGACY_ANT_B,
 274                         RS_COLUMN_INVALID,
 275                         RS_COLUMN_INVALID,
 276                 },
 277                 .checks = {
 278                         rs_siso_allow,
 279                         rs_ant_allow,
 280                 },
 281         },
 282         [RS_COLUMN_SISO_ANT_A_SGI] = {
 283                 .mode = RS_SISO,
 284                 .ant = ANT_A,
 285                 .sgi = true,
 286                 .next_columns = {
 287                         RS_COLUMN_SISO_ANT_B_SGI,
 288                         RS_COLUMN_MIMO2_SGI,
 289                         RS_COLUMN_SISO_ANT_A,
 290                         RS_COLUMN_LEGACY_ANT_A,
 291                         RS_COLUMN_LEGACY_ANT_B,
 292                         RS_COLUMN_INVALID,
 293                         RS_COLUMN_INVALID,
 294                 },
 295                 .checks = {
 296                         rs_siso_allow,
 297                         rs_ant_allow,
 298                         rs_sgi_allow,
 299                 },
 300         },
 301         [RS_COLUMN_SISO_ANT_B_SGI] = {
 302                 .mode = RS_SISO,
 303                 .ant = ANT_B,
 304                 .sgi = true,
 305                 .next_columns = {
 306                         RS_COLUMN_SISO_ANT_A_SGI,
 307                         RS_COLUMN_MIMO2_SGI,
 308                         RS_COLUMN_SISO_ANT_B,
 309                         RS_COLUMN_LEGACY_ANT_A,
 310                         RS_COLUMN_LEGACY_ANT_B,
 311                         RS_COLUMN_INVALID,
 312                         RS_COLUMN_INVALID,
 313                 },
 314                 .checks = {
 315                         rs_siso_allow,
 316                         rs_ant_allow,
 317                         rs_sgi_allow,
 318                 },
 319         },
 320         [RS_COLUMN_MIMO2] = {
 321                 .mode = RS_MIMO2,
 322                 .ant = ANT_AB,
 323                 .next_columns = {
 324                         RS_COLUMN_SISO_ANT_A,
 325                         RS_COLUMN_MIMO2_SGI,
 326                         RS_COLUMN_LEGACY_ANT_A,
 327                         RS_COLUMN_LEGACY_ANT_B,
 328                         RS_COLUMN_INVALID,
 329                         RS_COLUMN_INVALID,
 330                         RS_COLUMN_INVALID,
 331                 },
 332                 .checks = {
 333                         rs_mimo_allow,
 334                 },
 335         },
 336         [RS_COLUMN_MIMO2_SGI] = {
 337                 .mode = RS_MIMO2,
 338                 .ant = ANT_AB,
 339                 .sgi = true,
 340                 .next_columns = {
 341                         RS_COLUMN_SISO_ANT_A_SGI,
 342                         RS_COLUMN_MIMO2,
 343                         RS_COLUMN_LEGACY_ANT_A,
 344                         RS_COLUMN_LEGACY_ANT_B,
 345                         RS_COLUMN_INVALID,
 346                         RS_COLUMN_INVALID,
 347                         RS_COLUMN_INVALID,
 348                 },
 349                 .checks = {
 350                         rs_mimo_allow,
 351                         rs_sgi_allow,
 352                 },
 353         },
 354 };
 355
 356 static inline u8 rs_extract_rate(u32 rate_n_flags)
 357 {
 358         /* also works for HT because bits 7:6 are zero there */
 359         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 360 }
 361
 362 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 363 {
 364         int idx = 0;
 365
 366         if (rate_n_flags & RATE_MCS_HT_MSK) {
 367                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 368                 idx += IWL_RATE_MCS_0_INDEX;
 369
 370                 /* skip 9M not supported in HT*/
 371                 if (idx >= IWL_RATE_9M_INDEX)
 372                         idx += 1;
 373                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 374                         return idx;
 375         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 376                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 377                 idx += IWL_RATE_MCS_0_INDEX;
 378
 379                 /* skip 9M not supported in VHT*/
 380                 if (idx >= IWL_RATE_9M_INDEX)
 381                         idx++;
 382                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 383                         return idx;
 384         } else {
 385                 /* legacy rate format, search for match in table */
 386
 387                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 388                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 389                         if (iwl_rates[idx].plcp == legacy_rate)
 390                                 return idx;
 391         }
 392
 393         return IWL_RATE_INVALID;
 394 }
 395
 396 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 397                                   struct ieee80211_sta *sta,
 398                                   struct iwl_lq_sta *lq_sta,
 399                                   int tid, bool ndp);
 400 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 401                            struct ieee80211_sta *sta,
 402                            struct iwl_lq_sta *lq_sta,
 403                            const struct rs_rate *initial_rate);
 404 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 405
 406 /**
 407  * The following tables contain the expected throughput metrics for all rates
 408  *
 409  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 410  *
 411  * where invalid entries are zeros.
 412  *
 413  * CCK rates are only valid in legacy table and will only be used in G
 414  * (2.4 GHz) band.
 415  */
 416
 417 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 418         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 419 };
 420
 421 /* Expected TpT tables. 4 indexes:
 422  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 423  */
 424 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 425         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 426         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 427         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 428         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 429 };
 430
 431 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 432         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 433         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 434         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 435         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 436 };
 437
 438 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 439         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 440         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 441         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 442         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 443 };
 444
 445 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
 446         {0, 0, 0, 0, 191, 0, 244, 288,  298,  308,  313,  318,  323,  328,  330},
 447         {0, 0, 0, 0, 200, 0, 251, 293,  302,  312,  317,  322,  327,  332,  334},
 448         {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
 449         {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
 450 };
 451
 452 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 453         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 454         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 455         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 456         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 457 };
 458
 459 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 460         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 461         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 462         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 463         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 464 };
 465
 466 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 467         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 468         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 469         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 470         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 471 };
 472
 473 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
 474         {0, 0, 0, 0, 240, 0, 278,  308,  313,  319,  322,  324,  328,  330,   334},
 475         {0, 0, 0, 0, 247, 0, 282,  310,  315,  320,  323,  325,  329,  332,   338},
 476         {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629,  10592},
 477         {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
 478 };
 479
 480 /* mbps, mcs */
 481 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 482         {  "1", "BPSK DSSS"},
 483         {  "2", "QPSK DSSS"},
 484         {"5.5", "BPSK CCK"},
 485         { "11", "QPSK CCK"},
 486         {  "6", "BPSK 1/2"},
 487         {  "9", "BPSK 1/2"},
 488         { "12", "QPSK 1/2"},
 489         { "18", "QPSK 3/4"},
 490         { "24", "16QAM 1/2"},
 491         { "36", "16QAM 3/4"},
 492         { "48", "64QAM 2/3"},
 493         { "54", "64QAM 3/4"},
 494         { "60", "64QAM 5/6"},
 495 };
 496
 497 #define MCS_INDEX_PER_STREAM    (8)
 498
 499 static const char *rs_pretty_ant(u8 ant)
 500 {
 501         static const char * const ant_name[] = {
 502                 [ANT_NONE] = "None",
 503                 [ANT_A]    = "A",
 504                 [ANT_B]    = "B",
 505                 [ANT_AB]   = "AB",
 506                 [ANT_C]    = "C",
 507                 [ANT_AC]   = "AC",
 508                 [ANT_BC]   = "BC",
 509                 [ANT_ABC]  = "ABC",
 510         };
 511
 512         if (ant > ANT_ABC)
 513                 return "UNKNOWN";
 514
 515         return ant_name[ant];
 516 }
 517
 518 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 519 {
 520         static const char * const lq_types[] = {
 521                 [LQ_NONE] = "NONE",
 522                 [LQ_LEGACY_A] = "LEGACY_A",
 523                 [LQ_LEGACY_G] = "LEGACY_G",
 524                 [LQ_HT_SISO] = "HT SISO",
 525                 [LQ_HT_MIMO2] = "HT MIMO",
 526                 [LQ_VHT_SISO] = "VHT SISO",
 527                 [LQ_VHT_MIMO2] = "VHT MIMO",
 528         };
 529
 530         if (type < LQ_NONE || type >= LQ_MAX)
 531                 return "UNKNOWN";
 532
 533         return lq_types[type];
 534 }
 535
 536 static char *rs_pretty_rate(const struct rs_rate *rate)
 537 {
 538         static char buf[40];
 539         static const char * const legacy_rates[] = {
 540                 [IWL_RATE_1M_INDEX] = "1M",
 541                 [IWL_RATE_2M_INDEX] = "2M",
 542                 [IWL_RATE_5M_INDEX] = "5.5M",
 543                 [IWL_RATE_11M_INDEX] = "11M",
 544                 [IWL_RATE_6M_INDEX] = "6M",
 545                 [IWL_RATE_9M_INDEX] = "9M",
 546                 [IWL_RATE_12M_INDEX] = "12M",
 547                 [IWL_RATE_18M_INDEX] = "18M",
 548                 [IWL_RATE_24M_INDEX] = "24M",
 549                 [IWL_RATE_36M_INDEX] = "36M",
 550                 [IWL_RATE_48M_INDEX] = "48M",
 551                 [IWL_RATE_54M_INDEX] = "54M",
 552         };
 553         static const char *const ht_vht_rates[] = {
 554                 [IWL_RATE_MCS_0_INDEX] = "MCS0",
 555                 [IWL_RATE_MCS_1_INDEX] = "MCS1",
 556                 [IWL_RATE_MCS_2_INDEX] = "MCS2",
 557                 [IWL_RATE_MCS_3_INDEX] = "MCS3",
 558                 [IWL_RATE_MCS_4_INDEX] = "MCS4",
 559                 [IWL_RATE_MCS_5_INDEX] = "MCS5",
 560                 [IWL_RATE_MCS_6_INDEX] = "MCS6",
 561                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
 562                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
 563                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
 564         };
 565         const char *rate_str;
 566
 567         if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
 568                 rate_str = legacy_rates[rate->index];
 569         else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
 570                  (rate->index >= IWL_RATE_MCS_0_INDEX) &&
 571                  (rate->index <= IWL_RATE_MCS_9_INDEX))
 572                 rate_str = ht_vht_rates[rate->index];
 573         else
 574                 rate_str = "BAD_RATE";
 575
 576         sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
 577                 rs_pretty_ant(rate->ant), rate_str);
 578         return buf;
 579 }
 580
 581 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 582                                 const char *prefix)
 583 {
 584         IWL_DEBUG_RATE(mvm,
 585                        "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
 586                        prefix, rs_pretty_rate(rate), rate->bw,
 587                        rate->sgi, rate->ldpc, rate->stbc);
 588 }
 589
 590 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 591 {
 592         window->data = 0;
 593         window->success_counter = 0;
 594         window->success_ratio = IWL_INVALID_VALUE;
 595         window->counter = 0;
 596         window->average_tpt = IWL_INVALID_VALUE;
 597 }
 598
 599 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 600                                             struct iwl_scale_tbl_info *tbl)
 601 {
 602         int i;
 603
 604         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 605         for (i = 0; i < IWL_RATE_COUNT; i++)
 606                 rs_rate_scale_clear_window(&tbl->win[i]);
 607
 608         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 609                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 610 }
 611
 612 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 613 {
 614         return (ant_type & valid_antenna) == ant_type;
 615 }
 616
 617 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 618                                      struct iwl_lq_sta *lq_data, u8 tid,
 619                                      struct ieee80211_sta *sta)
 620 {
 621         int ret = -EAGAIN;
 622
 623         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 624                      sta->addr, tid);
 625         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 626         if (ret == -EAGAIN) {
 627                 /*
 628                  * driver and mac80211 is out of sync
 629                  * this might be cause by reloading firmware
 630                  * stop the tx ba session here
 631                  */
 632                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 633                         tid);
 634                 ieee80211_stop_tx_ba_session(sta, tid);
 635         }
 636         return ret;
 637 }
 638
 639 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 640                               struct iwl_lq_sta *lq_data,
 641                               struct ieee80211_sta *sta)
 642 {
 643         if (tid < IWL_MAX_TID_COUNT)
 644                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 645         else
 646                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 647                         tid, IWL_MAX_TID_COUNT);
 648 }
 649
 650 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 651 {
 652         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 653                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 654                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 655 }
 656
 657 /*
 658  * Static function to get the expected throughput from an iwl_scale_tbl_info
 659  * that wraps a NULL pointer check
 660  */
 661 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 662 {
 663         if (tbl->expected_tpt)
 664                 return tbl->expected_tpt[rs_index];
 665         return 0;
 666 }
 667
 668 /**
 669  * rs_collect_tx_data - Update the success/failure sliding window
 670  *
 671  * We keep a sliding window of the last 62 packets transmitted
 672  * at this rate.  window->data contains the bitmask of successful
 673  * packets.
 674  */
 675 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
 676                                struct iwl_scale_tbl_info *tbl,
 677                                int scale_index, int attempts, int successes,
 678                                struct iwl_rate_scale_data *window)
 679 {
 680         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 681         s32 fail_count, tpt;
 682
 683         /* Get expected throughput */
 684         tpt = get_expected_tpt(tbl, scale_index);
 685
 686         /*
 687          * Keep track of only the latest 62 tx frame attempts in this rate's
 688          * history window; anything older isn't really relevant any more.
 689          * If we have filled up the sliding window, drop the oldest attempt;
 690          * if the oldest attempt (highest bit in bitmap) shows "success",
 691          * subtract "1" from the success counter (this is the main reason
 692          * we keep these bitmaps!).
 693          */
 694         while (attempts > 0) {
 695                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 696                         /* remove earliest */
 697                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 698
 699                         if (window->data & mask) {
 700                                 window->data &= ~mask;
 701                                 window->success_counter--;
 702                         }
 703                 }
 704
 705                 /* Increment frames-attempted counter */
 706                 window->counter++;
 707
 708                 /* Shift bitmap by one frame to throw away oldest history */
 709                 window->data <<= 1;
 710
 711                 /* Mark the most recent #successes attempts as successful */
 712                 if (successes > 0) {
 713                         window->success_counter++;
 714                         window->data |= 0x1;
 715                         successes--;
 716                 }
 717
 718                 attempts--;
 719         }
 720
 721         /* Calculate current success ratio, avoid divide-by-0! */
 722         if (window->counter > 0)
 723                 window->success_ratio = 128 * (100 * window->success_counter)
 724                                         / window->counter;
 725         else
 726                 window->success_ratio = IWL_INVALID_VALUE;
 727
 728         fail_count = window->counter - window->success_counter;
 729
 730         /* Calculate average throughput, if we have enough history. */
 731         if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
 732             (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
 733                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 734         else
 735                 window->average_tpt = IWL_INVALID_VALUE;
 736
 737         return 0;
 738 }
 739
 740 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
 741                                struct iwl_lq_sta *lq_sta,
 742                                struct iwl_scale_tbl_info *tbl,
 743                                int scale_index, int attempts, int successes,
 744                                u8 reduced_txp)
 745 {
 746         struct iwl_rate_scale_data *window = NULL;
 747
 748         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 749                 return -EINVAL;
 750
 751         window = &tbl->tpc_win[reduced_txp];
 752         return  _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 753                                     window);
 754 }
 755
 756 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
 757                                struct iwl_lq_sta *lq_sta,
 758                                struct iwl_scale_tbl_info *tbl,
 759                                int scale_index, int attempts, int successes)
 760 {
 761         struct iwl_rate_scale_data *window = NULL;
 762
 763         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 764                 return -EINVAL;
 765
 766         if (tbl->column != RS_COLUMN_INVALID) {
 767                 struct lq_sta_pers *pers = &lq_sta->pers;
 768
 769                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 770                 pers->tx_stats[tbl->column][scale_index].success += successes;
 771         }
 772
 773         /* Select window for current tx bit rate */
 774         window = &(tbl->win[scale_index]);
 775         return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 776                                    window);
 777 }
 778
 779 /* Convert rs_rate object into ucode rate bitmask */
 780 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 781                                   struct rs_rate *rate)
 782 {
 783         u32 ucode_rate = 0;
 784         int index = rate->index;
 785
 786         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 787                          RATE_MCS_ANT_ABC_MSK);
 788
 789         if (is_legacy(rate)) {
 790                 ucode_rate |= iwl_rates[index].plcp;
 791                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 792                         ucode_rate |= RATE_MCS_CCK_MSK;
 793                 return ucode_rate;
 794         }
 795
 796         if (is_ht(rate)) {
 797                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 798                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 799                         index = IWL_LAST_HT_RATE;
 800                 }
 801                 ucode_rate |= RATE_MCS_HT_MSK;
 802
 803                 if (is_ht_siso(rate))
 804                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 805                 else if (is_ht_mimo2(rate))
 806                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 807                 else
 808                         WARN_ON_ONCE(1);
 809         } else if (is_vht(rate)) {
 810                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 811                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 812                         index = IWL_LAST_VHT_RATE;
 813                 }
 814                 ucode_rate |= RATE_MCS_VHT_MSK;
 815                 if (is_vht_siso(rate))
 816                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 817                 else if (is_vht_mimo2(rate))
 818                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 819                 else
 820                         WARN_ON_ONCE(1);
 821
 822         } else {
 823                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 824         }
 825
 826         if (is_siso(rate) && rate->stbc) {
 827                 /* To enable STBC we need to set both a flag and ANT_AB */
 828                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 829                 ucode_rate |= RATE_MCS_STBC_MSK;
 830         }
 831
 832         ucode_rate |= rate->bw;
 833         if (rate->sgi)
 834                 ucode_rate |= RATE_MCS_SGI_MSK;
 835         if (rate->ldpc)
 836                 ucode_rate |= RATE_MCS_LDPC_MSK;
 837
 838         return ucode_rate;
 839 }
 840
 841 /* Convert a ucode rate into an rs_rate object */
 842 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 843                                    enum nl80211_band band,
 844                                    struct rs_rate *rate)
 845 {
 846         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 847         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 848         u8 nss;
 849
 850         memset(rate, 0, sizeof(*rate));
 851         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 852
 853         if (rate->index == IWL_RATE_INVALID)
 854                 return -EINVAL;
 855
 856         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 857
 858         /* Legacy */
 859         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 860             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 861                 if (num_of_ant == 1) {
 862                         if (band == NL80211_BAND_5GHZ)
 863                                 rate->type = LQ_LEGACY_A;
 864                         else
 865                                 rate->type = LQ_LEGACY_G;
 866                 }
 867
 868                 return 0;
 869         }
 870
 871         /* HT or VHT */
 872         if (ucode_rate & RATE_MCS_SGI_MSK)
 873                 rate->sgi = true;
 874         if (ucode_rate & RATE_MCS_LDPC_MSK)
 875                 rate->ldpc = true;
 876         if (ucode_rate & RATE_MCS_STBC_MSK)
 877                 rate->stbc = true;
 878         if (ucode_rate & RATE_MCS_BF_MSK)
 879                 rate->bfer = true;
 880
 881         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 882
 883         if (ucode_rate & RATE_MCS_HT_MSK) {
 884                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 885                        RATE_HT_MCS_NSS_POS) + 1;
 886
 887                 if (nss == 1) {
 888                         rate->type = LQ_HT_SISO;
 889                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 890                                   "stbc %d bfer %d",
 891                                   rate->stbc, rate->bfer);
 892                 } else if (nss == 2) {
 893                         rate->type = LQ_HT_MIMO2;
 894                         WARN_ON_ONCE(num_of_ant != 2);
 895                 } else {
 896                         WARN_ON_ONCE(1);
 897                 }
 898         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 899                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 900                        RATE_VHT_MCS_NSS_POS) + 1;
 901
 902                 if (nss == 1) {
 903                         rate->type = LQ_VHT_SISO;
 904                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 905                                   "stbc %d bfer %d",
 906                                   rate->stbc, rate->bfer);
 907                 } else if (nss == 2) {
 908                         rate->type = LQ_VHT_MIMO2;
 909                         WARN_ON_ONCE(num_of_ant != 2);
 910                 } else {
 911                         WARN_ON_ONCE(1);
 912                 }
 913         }
 914
 915         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 916                      !is_vht(rate));
 917
 918         return 0;
 919 }
 920
 921 /* switch to another antenna/antennas and return 1 */
 922 /* if no other valid antenna found, return 0 */
 923 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 924 {
 925         u8 new_ant_type;
 926
 927         if (!rate->ant || rate->ant > ANT_ABC)
 928                 return 0;
 929
 930         if (!rs_is_valid_ant(valid_ant, rate->ant))
 931                 return 0;
 932
 933         new_ant_type = ant_toggle_lookup[rate->ant];
 934
 935         while ((new_ant_type != rate->ant) &&
 936                !rs_is_valid_ant(valid_ant, new_ant_type))
 937                 new_ant_type = ant_toggle_lookup[new_ant_type];
 938
 939         if (new_ant_type == rate->ant)
 940                 return 0;
 941
 942         rate->ant = new_ant_type;
 943
 944         return 1;
 945 }
 946
 947 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 948                                   struct rs_rate *rate)
 949 {
 950         if (is_legacy(rate))
 951                 return lq_sta->active_legacy_rate;
 952         else if (is_siso(rate))
 953                 return lq_sta->active_siso_rate;
 954         else if (is_mimo2(rate))
 955                 return lq_sta->active_mimo2_rate;
 956
 957         WARN_ON_ONCE(1);
 958         return 0;
 959 }
 960
 961 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 962                                 int rate_type)
 963 {
 964         u8 high = IWL_RATE_INVALID;
 965         u8 low = IWL_RATE_INVALID;
 966
 967         /* 802.11A or ht walks to the next literal adjacent rate in
 968          * the rate table */
 969         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 970                 int i;
 971                 u32 mask;
 972
 973                 /* Find the previous rate that is in the rate mask */
 974                 i = index - 1;
 975                 if (i >= 0)
 976                         mask = BIT(i);
 977                 for (; i >= 0; i--, mask >>= 1) {
 978                         if (rate_mask & mask) {
 979                                 low = i;
 980                                 break;
 981                         }
 982                 }
 983
 984                 /* Find the next rate that is in the rate mask */
 985                 i = index + 1;
 986                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 987                         if (rate_mask & mask) {
 988                                 high = i;
 989                                 break;
 990                         }
 991                 }
 992
 993                 return (high << 8) | low;
 994         }
 995
 996         low = index;
 997         while (low != IWL_RATE_INVALID) {
 998                 low = iwl_rates[low].prev_rs;
 999                 if (low == IWL_RATE_INVALID)
1000                         break;
1001                 if (rate_mask & (1 << low))
1002                         break;
1003         }
1004
1005         high = index;
1006         while (high != IWL_RATE_INVALID) {
1007                 high = iwl_rates[high].next_rs;
1008                 if (high == IWL_RATE_INVALID)
1009                         break;
1010                 if (rate_mask & (1 << high))
1011                         break;
1012         }
1013
1014         return (high << 8) | low;
1015 }
1016
1017 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1018                                      struct rs_rate *rate)
1019 {
1020         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1021 }
1022
1023 /* Get the next supported lower rate in the current column.
1024  * Return true if bottom rate in the current column was reached
1025  */
1026 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1027                                         struct rs_rate *rate)
1028 {
1029         u8 low;
1030         u16 high_low;
1031         u16 rate_mask;
1032         struct iwl_mvm *mvm = lq_sta->pers.drv;
1033
1034         rate_mask = rs_get_supported_rates(lq_sta, rate);
1035         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1036                                         rate->type);
1037         low = high_low & 0xff;
1038
1039         /* Bottom rate of column reached */
1040         if (low == IWL_RATE_INVALID)
1041                 return true;
1042
1043         rate->index = low;
1044         return false;
1045 }
1046
1047 /* Get the next rate to use following a column downgrade */
1048 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1049                                           struct rs_rate *rate)
1050 {
1051         struct iwl_mvm *mvm = lq_sta->pers.drv;
1052
1053         if (is_legacy(rate)) {
1054                 /* No column to downgrade from Legacy */
1055                 return;
1056         } else if (is_siso(rate)) {
1057                 /* Downgrade to Legacy if we were in SISO */
1058                 if (lq_sta->band == NL80211_BAND_5GHZ)
1059                         rate->type = LQ_LEGACY_A;
1060                 else
1061                         rate->type = LQ_LEGACY_G;
1062
1063                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1064
1065                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1066                              rate->index > IWL_RATE_MCS_9_INDEX);
1067
1068                 rate->index = rs_ht_to_legacy[rate->index];
1069                 rate->ldpc = false;
1070         } else {
1071                 /* Downgrade to SISO with same MCS if in MIMO  */
1072                 rate->type = is_vht_mimo2(rate) ?
1073                         LQ_VHT_SISO : LQ_HT_SISO;
1074         }
1075
1076         if (num_of_ant(rate->ant) > 1)
1077                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1078
1079         /* Relevant in both switching to SISO or Legacy */
1080         rate->sgi = false;
1081
1082         if (!rs_rate_supported(lq_sta, rate))
1083                 rs_get_lower_rate_in_column(lq_sta, rate);
1084 }
1085
1086 /* Check if both rates are identical
1087  * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1088  * with a rate indicating STBC/BFER and ANT_AB.
1089  */
1090 static inline bool rs_rate_equal(struct rs_rate *a,
1091                                  struct rs_rate *b,
1092                                  bool allow_ant_mismatch)
1093
1094 {
1095         bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1096                 (a->bfer == b->bfer);
1097
1098         if (allow_ant_mismatch) {
1099                 if (a->stbc || a->bfer) {
1100                         WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1101                                   a->stbc, a->bfer, a->ant);
1102                         ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1103                 } else if (b->stbc || b->bfer) {
1104                         WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1105                                   b->stbc, b->bfer, b->ant);
1106                         ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1107                 }
1108         }
1109
1110         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1111                 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1112 }
1113
1114 /* Check if both rates share the same column */
1115 static inline bool rs_rate_column_match(struct rs_rate *a,
1116                                         struct rs_rate *b)
1117 {
1118         bool ant_match;
1119
1120         if (a->stbc || a->bfer)
1121                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1122         else
1123                 ant_match = (a->ant == b->ant);
1124
1125         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1126                 && ant_match;
1127 }
1128
1129 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1130 {
1131         if (is_legacy(rate)) {
1132                 if (rate->ant == ANT_A)
1133                         return RS_COLUMN_LEGACY_ANT_A;
1134
1135                 if (rate->ant == ANT_B)
1136                         return RS_COLUMN_LEGACY_ANT_B;
1137
1138                 goto err;
1139         }
1140
1141         if (is_siso(rate)) {
1142                 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1143                         return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1144                                 RS_COLUMN_SISO_ANT_A;
1145
1146                 if (rate->ant == ANT_B)
1147                         return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1148                                 RS_COLUMN_SISO_ANT_B;
1149
1150                 goto err;
1151         }
1152
1153         if (is_mimo(rate))
1154                 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1155
1156 err:
1157         return RS_COLUMN_INVALID;
1158 }
1159
1160 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1161 {
1162         u8 tid = IWL_MAX_TID_COUNT;
1163
1164         if (ieee80211_is_data_qos(hdr->frame_control)) {
1165                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1166                 tid = qc[0] & 0xf;
1167         }
1168
1169         if (unlikely(tid > IWL_MAX_TID_COUNT))
1170                 tid = IWL_MAX_TID_COUNT;
1171
1172         return tid;
1173 }
1174
1175 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1176                           int tid, struct ieee80211_tx_info *info, bool ndp)
1177 {
1178         int legacy_success;
1179         int retries;
1180         int i;
1181         struct iwl_lq_cmd *table;
1182         u32 lq_hwrate;
1183         struct rs_rate lq_rate, tx_resp_rate;
1184         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1185         u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1186         u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1187         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1188         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1189         bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa,
1190                                              IWL_UCODE_TLV_API_LQ_SS_PARAMS);
1191
1192         /* Treat uninitialized rate scaling data same as non-existing. */
1193         if (!lq_sta) {
1194                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1195                 return;
1196         } else if (!lq_sta->pers.drv) {
1197                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1198                 return;
1199         }
1200
1201         /* This packet was aggregated but doesn't carry status info */
1202         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1203             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1204                 return;
1205
1206         rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1207
1208 #ifdef CONFIG_MAC80211_DEBUGFS
1209         /* Disable last tx check if we are debugging with fixed rate but
1210          * update tx stats */
1211         if (lq_sta->pers.dbg_fixed_rate) {
1212                 int index = tx_resp_rate.index;
1213                 enum rs_column column;
1214                 int attempts, success;
1215
1216                 column = rs_get_column_from_rate(&tx_resp_rate);
1217                 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1218                               "Can't map rate 0x%x to column",
1219                               tx_resp_hwrate))
1220                         return;
1221
1222                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1223                         attempts = info->status.ampdu_len;
1224                         success = info->status.ampdu_ack_len;
1225                 } else {
1226                         attempts = info->status.rates[0].count;
1227                         success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1228                 }
1229
1230                 lq_sta->pers.tx_stats[column][index].total += attempts;
1231                 lq_sta->pers.tx_stats[column][index].success += success;
1232
1233                 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1234                                tx_resp_hwrate, success, attempts);
1235                 return;
1236         }
1237 #endif
1238
1239         if (time_after(jiffies,
1240                        (unsigned long)(lq_sta->last_tx +
1241                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1242                 int t;
1243
1244                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1245                 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1246                         ieee80211_stop_tx_ba_session(sta, t);
1247
1248                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1249                 return;
1250         }
1251         lq_sta->last_tx = jiffies;
1252
1253         /* Ignore this Tx frame response if its initial rate doesn't match
1254          * that of latest Link Quality command.  There may be stragglers
1255          * from a previous Link Quality command, but we're no longer interested
1256          * in those; they're either from the "active" mode while we're trying
1257          * to check "search" mode, or a prior "search" mode after we've moved
1258          * to a new "search" mode (which might become the new "active" mode).
1259          */
1260         table = &lq_sta->lq;
1261         lq_hwrate = le32_to_cpu(table->rs_table[0]);
1262         rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1263
1264         /* Here we actually compare this rate to the latest LQ command */
1265         if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1266                 IWL_DEBUG_RATE(mvm,
1267                                "initial tx resp rate 0x%x does not match 0x%x\n",
1268                                tx_resp_hwrate, lq_hwrate);
1269
1270                 /*
1271                  * Since rates mis-match, the last LQ command may have failed.
1272                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1273                  * ... driver.
1274                  */
1275                 lq_sta->missed_rate_counter++;
1276                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1277                         lq_sta->missed_rate_counter = 0;
1278                         IWL_DEBUG_RATE(mvm,
1279                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1280                                        lq_sta->rs_state);
1281                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1282                 }
1283                 /* Regardless, ignore this status info for outdated rate */
1284                 return;
1285         } else
1286                 /* Rate did match, so reset the missed_rate_counter */
1287                 lq_sta->missed_rate_counter = 0;
1288
1289         if (!lq_sta->search_better_tbl) {
1290                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1291                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1292         } else {
1293                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1294                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1295         }
1296
1297         if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1298                 IWL_DEBUG_RATE(mvm,
1299                                "Neither active nor search matches tx rate\n");
1300                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1301                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1302                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1303                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1304                 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1305
1306                 /*
1307                  * no matching table found, let's by-pass the data collection
1308                  * and continue to perform rate scale to find the rate table
1309                  */
1310                 rs_stay_in_table(lq_sta, true);
1311                 goto done;
1312         }
1313
1314         /*
1315          * Updating the frame history depends on whether packets were
1316          * aggregated.
1317          *
1318          * For aggregation, all packets were transmitted at the same rate, the
1319          * first index into rate scale table.
1320          */
1321         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1322                 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1323                                     info->status.ampdu_len,
1324                                     info->status.ampdu_ack_len,
1325                                     reduced_txp);
1326
1327                 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1328                  * it as a single frame loss as we don't want the success ratio
1329                  * to dip too quickly because a BA wasn't received.
1330                  * For TPC, there's no need for this optimisation since we want
1331                  * to recover very quickly from a bad power reduction and,
1332                  * therefore we'd like the success ratio to get an immediate hit
1333                  * when failing to get a BA, so we'd switch back to a lower or
1334                  * zero power reduction. When FW transmits agg with a rate
1335                  * different from the initial rate, it will not use reduced txp
1336                  * and will send BA notification twice (one empty with reduced
1337                  * txp equal to the value from LQ and one with reduced txp 0).
1338                  * We need to update counters for each txp level accordingly.
1339                  */
1340                 if (info->status.ampdu_ack_len == 0)
1341                         info->status.ampdu_len = 1;
1342
1343                 rs_collect_tlc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1344                                     info->status.ampdu_len,
1345                                     info->status.ampdu_ack_len);
1346
1347                 /* Update success/fail counts if not searching for new mode */
1348                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1349                         lq_sta->total_success += info->status.ampdu_ack_len;
1350                         lq_sta->total_failed += (info->status.ampdu_len -
1351                                         info->status.ampdu_ack_len);
1352                 }
1353         } else {
1354                 /* For legacy, update frame history with for each Tx retry. */
1355                 retries = info->status.rates[0].count - 1;
1356                 /* HW doesn't send more than 15 retries */
1357                 retries = min(retries, 15);
1358
1359                 /* The last transmission may have been successful */
1360                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1361                 /* Collect data for each rate used during failed TX attempts */
1362                 for (i = 0; i <= retries; ++i) {
1363                         lq_hwrate = le32_to_cpu(table->rs_table[i]);
1364                         rs_rate_from_ucode_rate(lq_hwrate, info->band,
1365                                                 &lq_rate);
1366                         /*
1367                          * Only collect stats if retried rate is in the same RS
1368                          * table as active/search.
1369                          */
1370                         if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1371                                 tmp_tbl = curr_tbl;
1372                         else if (rs_rate_column_match(&lq_rate,
1373                                                       &other_tbl->rate))
1374                                 tmp_tbl = other_tbl;
1375                         else
1376                                 continue;
1377
1378                         rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1379                                             lq_rate.index, 1,
1380                                             i < retries ? 0 : legacy_success,
1381                                             reduced_txp);
1382                         rs_collect_tlc_data(mvm, lq_sta, tmp_tbl,
1383                                             lq_rate.index, 1,
1384                                             i < retries ? 0 : legacy_success);
1385                 }
1386
1387                 /* Update success/fail counts if not searching for new mode */
1388                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1389                         lq_sta->total_success += legacy_success;
1390                         lq_sta->total_failed += retries + (1 - legacy_success);
1391                 }
1392         }
1393         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1394         lq_sta->last_rate_n_flags = lq_hwrate;
1395         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1396 done:
1397         /* See if there's a better rate or modulation mode to try. */
1398         if (sta->supp_rates[info->band])
1399                 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
1400 }
1401
1402 /*
1403  * mac80211 sends us Tx status
1404  */
1405 static void rs_mac80211_tx_status(void *mvm_r,
1406                                   struct ieee80211_supported_band *sband,
1407                                   struct ieee80211_sta *sta, void *priv_sta,
1408                                   struct sk_buff *skb)
1409 {
1410         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1411         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1412         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1413         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1414
1415         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1416                 return;
1417
1418         if (!ieee80211_is_data(hdr->frame_control) ||
1419             info->flags & IEEE80211_TX_CTL_NO_ACK)
1420                 return;
1421
1422         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1423                              ieee80211_is_qos_nullfunc(hdr->frame_control));
1424 }
1425
1426 /*
1427  * Begin a period of staying with a selected modulation mode.
1428  * Set "stay_in_tbl" flag to prevent any mode switches.
1429  * Set frame tx success limits according to legacy vs. high-throughput,
1430  * and reset overall (spanning all rates) tx success history statistics.
1431  * These control how long we stay using same modulation mode before
1432  * searching for a new mode.
1433  */
1434 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1435                                  struct iwl_lq_sta *lq_sta)
1436 {
1437         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1438         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1439         if (is_legacy) {
1440                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1441                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1442                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1443         } else {
1444                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1445                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1446                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1447         }
1448         lq_sta->table_count = 0;
1449         lq_sta->total_failed = 0;
1450         lq_sta->total_success = 0;
1451         lq_sta->flush_timer = jiffies;
1452         lq_sta->visited_columns = 0;
1453 }
1454
1455 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1456 {
1457         if (rate_mask)
1458                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1459         return IWL_RATE_INVALID;
1460 }
1461
1462 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1463                                    const struct rs_tx_column *column)
1464 {
1465         switch (column->mode) {
1466         case RS_LEGACY:
1467                 return lq_sta->max_legacy_rate_idx;
1468         case RS_SISO:
1469                 return lq_sta->max_siso_rate_idx;
1470         case RS_MIMO2:
1471                 return lq_sta->max_mimo2_rate_idx;
1472         default:
1473                 WARN_ON_ONCE(1);
1474         }
1475
1476         return lq_sta->max_legacy_rate_idx;
1477 }
1478
1479 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1480                                             const struct rs_tx_column *column,
1481                                             u32 bw)
1482 {
1483         /* Used to choose among HT tables */
1484         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1485
1486         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1487                          column->mode != RS_SISO &&
1488                          column->mode != RS_MIMO2))
1489                 return expected_tpt_legacy;
1490
1491         /* Legacy rates have only one table */
1492         if (column->mode == RS_LEGACY)
1493                 return expected_tpt_legacy;
1494
1495         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1496         /* Choose among many HT tables depending on number of streams
1497          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1498          * status */
1499         if (column->mode == RS_SISO) {
1500                 switch (bw) {
1501                 case RATE_MCS_CHAN_WIDTH_20:
1502                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1503                         break;
1504                 case RATE_MCS_CHAN_WIDTH_40:
1505                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1506                         break;
1507                 case RATE_MCS_CHAN_WIDTH_80:
1508                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1509                         break;
1510                 case RATE_MCS_CHAN_WIDTH_160:
1511                         ht_tbl_pointer = expected_tpt_siso_160MHz;
1512                         break;
1513                 default:
1514                         WARN_ON_ONCE(1);
1515                 }
1516         } else if (column->mode == RS_MIMO2) {
1517                 switch (bw) {
1518                 case RATE_MCS_CHAN_WIDTH_20:
1519                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1520                         break;
1521                 case RATE_MCS_CHAN_WIDTH_40:
1522                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1523                         break;
1524                 case RATE_MCS_CHAN_WIDTH_80:
1525                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1526                         break;
1527                 case RATE_MCS_CHAN_WIDTH_160:
1528                         ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1529                         break;
1530                 default:
1531                         WARN_ON_ONCE(1);
1532                 }
1533         } else {
1534                 WARN_ON_ONCE(1);
1535         }
1536
1537         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1538                 return ht_tbl_pointer[0];
1539         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1540                 return ht_tbl_pointer[1];
1541         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1542                 return ht_tbl_pointer[2];
1543         else                                            /* AGG+SGI */
1544                 return ht_tbl_pointer[3];
1545 }
1546
1547 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1548                                       struct iwl_scale_tbl_info *tbl)
1549 {
1550         struct rs_rate *rate = &tbl->rate;
1551         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1552
1553         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1554 }
1555
1556 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1557                             struct iwl_lq_sta *lq_sta,
1558                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1559                             unsigned long rate_mask, s8 index)
1560 {
1561         struct iwl_scale_tbl_info *active_tbl =
1562             &(lq_sta->lq_info[lq_sta->active_tbl]);
1563         s32 success_ratio = active_tbl->win[index].success_ratio;
1564         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1565         const u16 *tpt_tbl = tbl->expected_tpt;
1566         u16 high_low;
1567         u32 target_tpt;
1568         int rate_idx;
1569
1570         if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1571                 target_tpt = 100 * expected_current_tpt;
1572                 IWL_DEBUG_RATE(mvm,
1573                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1574                                success_ratio, target_tpt);
1575         } else {
1576                 target_tpt = lq_sta->last_tpt;
1577                 IWL_DEBUG_RATE(mvm,
1578                                "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1579                                success_ratio, target_tpt);
1580         }
1581
1582         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1583
1584         while (rate_idx != IWL_RATE_INVALID) {
1585                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1586                         break;
1587
1588                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1589                                                 tbl->rate.type);
1590
1591                 rate_idx = (high_low >> 8) & 0xff;
1592         }
1593
1594         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1595                        rate_idx, target_tpt,
1596                        rate_idx != IWL_RATE_INVALID ?
1597                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1598
1599         return rate_idx;
1600 }
1601
1602 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1603 {
1604         switch (sta->bandwidth) {
1605         case IEEE80211_STA_RX_BW_160:
1606                 return RATE_MCS_CHAN_WIDTH_160;
1607         case IEEE80211_STA_RX_BW_80:
1608                 return RATE_MCS_CHAN_WIDTH_80;
1609         case IEEE80211_STA_RX_BW_40:
1610                 return RATE_MCS_CHAN_WIDTH_40;
1611         case IEEE80211_STA_RX_BW_20:
1612         default:
1613                 return RATE_MCS_CHAN_WIDTH_20;
1614         }
1615 }
1616
1617 /*
1618  * Check whether we should continue using same modulation mode, or
1619  * begin search for a new mode, based on:
1620  * 1) # tx successes or failures while using this mode
1621  * 2) # times calling this function
1622  * 3) elapsed time in this mode (not used, for now)
1623  */
1624 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1625 {
1626         struct iwl_scale_tbl_info *tbl;
1627         int active_tbl;
1628         int flush_interval_passed = 0;
1629         struct iwl_mvm *mvm;
1630
1631         mvm = lq_sta->pers.drv;
1632         active_tbl = lq_sta->active_tbl;
1633
1634         tbl = &(lq_sta->lq_info[active_tbl]);
1635
1636         /* If we've been disallowing search, see if we should now allow it */
1637         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1638                 /* Elapsed time using current modulation mode */
1639                 if (lq_sta->flush_timer)
1640                         flush_interval_passed =
1641                                 time_after(jiffies,
1642                                            (unsigned long)(lq_sta->flush_timer +
1643                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1644
1645                 /*
1646                  * Check if we should allow search for new modulation mode.
1647                  * If many frames have failed or succeeded, or we've used
1648                  * this same modulation for a long time, allow search, and
1649                  * reset history stats that keep track of whether we should
1650                  * allow a new search.  Also (below) reset all bitmaps and
1651                  * stats in active history.
1652                  */
1653                 if (force_search ||
1654                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1655                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1656                     ((!lq_sta->search_better_tbl) &&
1657                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1658                         IWL_DEBUG_RATE(mvm,
1659                                        "LQ: stay is expired %d %d %d\n",
1660                                      lq_sta->total_failed,
1661                                      lq_sta->total_success,
1662                                      flush_interval_passed);
1663
1664                         /* Allow search for new mode */
1665                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1666                         IWL_DEBUG_RATE(mvm,
1667                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1668                         lq_sta->total_failed = 0;
1669                         lq_sta->total_success = 0;
1670                         lq_sta->flush_timer = 0;
1671                         /* mark the current column as visited */
1672                         lq_sta->visited_columns = BIT(tbl->column);
1673                 /*
1674                  * Else if we've used this modulation mode enough repetitions
1675                  * (regardless of elapsed time or success/failure), reset
1676                  * history bitmaps and rate-specific stats for all rates in
1677                  * active table.
1678                  */
1679                 } else {
1680                         lq_sta->table_count++;
1681                         if (lq_sta->table_count >=
1682                             lq_sta->table_count_limit) {
1683                                 lq_sta->table_count = 0;
1684
1685                                 IWL_DEBUG_RATE(mvm,
1686                                                "LQ: stay in table clear win\n");
1687                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1688                         }
1689                 }
1690
1691                 /* If transitioning to allow "search", reset all history
1692                  * bitmaps and stats in active table (this will become the new
1693                  * "search" table). */
1694                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1695                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1696                 }
1697         }
1698 }
1699
1700 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1701                              struct iwl_scale_tbl_info *tbl,
1702                              enum rs_action scale_action)
1703 {
1704         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
1705
1706         if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1707             tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1708             scale_action == RS_ACTION_DOWNSCALE)
1709                 sta_priv->tlc_amsdu = false;
1710         else
1711                 sta_priv->tlc_amsdu = true;
1712 }
1713
1714 /*
1715  * setup rate table in uCode
1716  */
1717 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1718                                struct ieee80211_sta *sta,
1719                                struct iwl_lq_sta *lq_sta,
1720                                struct iwl_scale_tbl_info *tbl)
1721 {
1722         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1723         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1724 }
1725
1726 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1727                               struct ieee80211_sta *sta,
1728                               struct iwl_lq_sta *lq_sta,
1729                               struct iwl_scale_tbl_info *tbl,
1730                               enum rs_action scale_action)
1731 {
1732         if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1733                 return false;
1734
1735         if (!is_vht_siso(&tbl->rate))
1736                 return false;
1737
1738         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1739             (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1740             (scale_action == RS_ACTION_DOWNSCALE)) {
1741                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1742                 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1743                 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1744                 goto tweaked;
1745         }
1746
1747         /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1748          * sustainable, i.e. we're past the test window. We can't go back
1749          * if MCS5 is just tested as this will happen always after switching
1750          * to 20Mhz MCS4 because the rate stats are cleared.
1751          */
1752         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1753             (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1754              (scale_action == RS_ACTION_STAY)) ||
1755              ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1756               (scale_action == RS_ACTION_UPSCALE)))) {
1757                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1758                 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1759                 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1760                 goto tweaked;
1761         }
1762
1763         return false;
1764
1765 tweaked:
1766         rs_set_expected_tpt_table(lq_sta, tbl);
1767         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1768         return true;
1769 }
1770
1771 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1772                                          struct iwl_lq_sta *lq_sta,
1773                                          struct ieee80211_sta *sta,
1774                                          struct iwl_scale_tbl_info *tbl)
1775 {
1776         int i, j, max_rate;
1777         enum rs_column next_col_id;
1778         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1779         const struct rs_tx_column *next_col;
1780         allow_column_func_t allow_func;
1781         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1782         const u16 *expected_tpt_tbl;
1783         u16 tpt, max_expected_tpt;
1784
1785         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1786                 next_col_id = curr_col->next_columns[i];
1787
1788                 if (next_col_id == RS_COLUMN_INVALID)
1789                         continue;
1790
1791                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1792                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1793                                        next_col_id);
1794                         continue;
1795                 }
1796
1797                 next_col = &rs_tx_columns[next_col_id];
1798
1799                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1800                         IWL_DEBUG_RATE(mvm,
1801                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1802                                        next_col_id, valid_ants, next_col->ant);
1803                         continue;
1804                 }
1805
1806                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1807                         allow_func = next_col->checks[j];
1808                         if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1809                                                       next_col))
1810                                 break;
1811                 }
1812
1813                 if (j != MAX_COLUMN_CHECKS) {
1814                         IWL_DEBUG_RATE(mvm,
1815                                        "Skip column %d: not allowed (check %d failed)\n",
1816                                        next_col_id, j);
1817
1818                         continue;
1819                 }
1820
1821                 tpt = lq_sta->last_tpt / 100;
1822                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1823                                                      rs_bw_from_sta_bw(sta));
1824                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1825                         continue;
1826
1827                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1828                 if (max_rate == IWL_RATE_INVALID) {
1829                         IWL_DEBUG_RATE(mvm,
1830                                        "Skip column %d: no rate is allowed in this column\n",
1831                                        next_col_id);
1832                         continue;
1833                 }
1834
1835                 max_expected_tpt = expected_tpt_tbl[max_rate];
1836                 if (tpt >= max_expected_tpt) {
1837                         IWL_DEBUG_RATE(mvm,
1838                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1839                                        next_col_id, max_expected_tpt, tpt);
1840                         continue;
1841                 }
1842
1843                 IWL_DEBUG_RATE(mvm,
1844                                "Found potential column %d. Max expected %d current %d\n",
1845                                next_col_id, max_expected_tpt, tpt);
1846                 break;
1847         }
1848
1849         if (i == MAX_NEXT_COLUMNS)
1850                 return RS_COLUMN_INVALID;
1851
1852         return next_col_id;
1853 }
1854
1855 static int rs_switch_to_column(struct iwl_mvm *mvm,
1856                                struct iwl_lq_sta *lq_sta,
1857                                struct ieee80211_sta *sta,
1858                                enum rs_column col_id)
1859 {
1860         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1861         struct iwl_scale_tbl_info *search_tbl =
1862                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1863         struct rs_rate *rate = &search_tbl->rate;
1864         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1865         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1866         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1867                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1868         unsigned long rate_mask = 0;
1869         u32 rate_idx = 0;
1870
1871         memcpy(search_tbl, tbl, sz);
1872
1873         rate->sgi = column->sgi;
1874         rate->ant = column->ant;
1875
1876         if (column->mode == RS_LEGACY) {
1877                 if (lq_sta->band == NL80211_BAND_5GHZ)
1878                         rate->type = LQ_LEGACY_A;
1879                 else
1880                         rate->type = LQ_LEGACY_G;
1881
1882                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1883                 rate->ldpc = false;
1884                 rate_mask = lq_sta->active_legacy_rate;
1885         } else if (column->mode == RS_SISO) {
1886                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1887                 rate_mask = lq_sta->active_siso_rate;
1888         } else if (column->mode == RS_MIMO2) {
1889                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1890                 rate_mask = lq_sta->active_mimo2_rate;
1891         } else {
1892                 WARN_ONCE(1, "Bad column mode");
1893         }
1894
1895         if (column->mode != RS_LEGACY) {
1896                 rate->bw = rs_bw_from_sta_bw(sta);
1897                 rate->ldpc = lq_sta->ldpc;
1898         }
1899
1900         search_tbl->column = col_id;
1901         rs_set_expected_tpt_table(lq_sta, search_tbl);
1902
1903         lq_sta->visited_columns |= BIT(col_id);
1904
1905         /* Get the best matching rate if we're changing modes. e.g.
1906          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1907          */
1908         if (curr_column->mode != column->mode) {
1909                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1910                                             rate_mask, rate->index);
1911
1912                 if ((rate_idx == IWL_RATE_INVALID) ||
1913                     !(BIT(rate_idx) & rate_mask)) {
1914                         IWL_DEBUG_RATE(mvm,
1915                                        "can not switch with index %d"
1916                                        " rate mask %lx\n",
1917                                        rate_idx, rate_mask);
1918
1919                         goto err;
1920                 }
1921
1922                 rate->index = rate_idx;
1923         }
1924
1925         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1926                        col_id, rate->index);
1927
1928         return 0;
1929
1930 err:
1931         rate->type = LQ_NONE;
1932         return -1;
1933 }
1934
1935 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1936                                          struct iwl_scale_tbl_info *tbl,
1937                                          s32 sr, int low, int high,
1938                                          int current_tpt,
1939                                          int low_tpt, int high_tpt)
1940 {
1941         enum rs_action action = RS_ACTION_STAY;
1942
1943         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1944             (current_tpt == 0)) {
1945                 IWL_DEBUG_RATE(mvm,
1946                                "Decrease rate because of low SR\n");
1947                 return RS_ACTION_DOWNSCALE;
1948         }
1949
1950         if ((low_tpt == IWL_INVALID_VALUE) &&
1951             (high_tpt == IWL_INVALID_VALUE) &&
1952             (high != IWL_RATE_INVALID)) {
1953                 IWL_DEBUG_RATE(mvm,
1954                                "No data about high/low rates. Increase rate\n");
1955                 return RS_ACTION_UPSCALE;
1956         }
1957
1958         if ((high_tpt == IWL_INVALID_VALUE) &&
1959             (high != IWL_RATE_INVALID) &&
1960             (low_tpt != IWL_INVALID_VALUE) &&
1961             (low_tpt < current_tpt)) {
1962                 IWL_DEBUG_RATE(mvm,
1963                                "No data about high rate and low rate is worse. Increase rate\n");
1964                 return RS_ACTION_UPSCALE;
1965         }
1966
1967         if ((high_tpt != IWL_INVALID_VALUE) &&
1968             (high_tpt > current_tpt)) {
1969                 IWL_DEBUG_RATE(mvm,
1970                                "Higher rate is better. Increate rate\n");
1971                 return RS_ACTION_UPSCALE;
1972         }
1973
1974         if ((low_tpt != IWL_INVALID_VALUE) &&
1975             (high_tpt != IWL_INVALID_VALUE) &&
1976             (low_tpt < current_tpt) &&
1977             (high_tpt < current_tpt)) {
1978                 IWL_DEBUG_RATE(mvm,
1979                                "Both high and low are worse. Maintain rate\n");
1980                 return RS_ACTION_STAY;
1981         }
1982
1983         if ((low_tpt != IWL_INVALID_VALUE) &&
1984             (low_tpt > current_tpt)) {
1985                 IWL_DEBUG_RATE(mvm,
1986                                "Lower rate is better\n");
1987                 action = RS_ACTION_DOWNSCALE;
1988                 goto out;
1989         }
1990
1991         if ((low_tpt == IWL_INVALID_VALUE) &&
1992             (low != IWL_RATE_INVALID)) {
1993                 IWL_DEBUG_RATE(mvm,
1994                                "No data about lower rate\n");
1995                 action = RS_ACTION_DOWNSCALE;
1996                 goto out;
1997         }
1998
1999         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
2000
2001 out:
2002         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
2003                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
2004                         IWL_DEBUG_RATE(mvm,
2005                                        "SR is above NO DECREASE. Avoid downscale\n");
2006                         action = RS_ACTION_STAY;
2007                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
2008                         IWL_DEBUG_RATE(mvm,
2009                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
2010                         action = RS_ACTION_STAY;
2011                 } else {
2012                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
2013                 }
2014         }
2015
2016         return action;
2017 }
2018
2019 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2020                           struct iwl_lq_sta *lq_sta)
2021 {
2022         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
2023          * supports STBC of at least 1*SS
2024          */
2025         if (!lq_sta->stbc_capable)
2026                 return false;
2027
2028         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2029                 return false;
2030
2031         return true;
2032 }
2033
2034 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2035                                 int *weaker, int *stronger)
2036 {
2037         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2038         if (*weaker > TPC_MAX_REDUCTION)
2039                 *weaker = TPC_INVALID;
2040
2041         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2042         if (*stronger < 0)
2043                 *stronger = TPC_INVALID;
2044 }
2045
2046 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2047                            struct rs_rate *rate, enum nl80211_band band)
2048 {
2049         int index = rate->index;
2050         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2051         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2052                                 !vif->bss_conf.ps);
2053
2054         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2055                        cam, sta_ps_disabled);
2056         /*
2057          * allow tpc only if power management is enabled, or bt coex
2058          * activity grade allows it and we are on 2.4Ghz.
2059          */
2060         if ((cam || sta_ps_disabled) &&
2061             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2062                 return false;
2063
2064         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2065         if (is_legacy(rate))
2066                 return index == IWL_RATE_54M_INDEX;
2067         if (is_ht(rate))
2068                 return index == IWL_RATE_MCS_7_INDEX;
2069         if (is_vht(rate))
2070                 return index == IWL_RATE_MCS_7_INDEX ||
2071                        index == IWL_RATE_MCS_8_INDEX ||
2072                        index == IWL_RATE_MCS_9_INDEX;
2073
2074         WARN_ON_ONCE(1);
2075         return false;
2076 }
2077
2078 enum tpc_action {
2079         TPC_ACTION_STAY,
2080         TPC_ACTION_DECREASE,
2081         TPC_ACTION_INCREASE,
2082         TPC_ACTION_NO_RESTIRCTION,
2083 };
2084
2085 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2086                                          s32 sr, int weak, int strong,
2087                                          int current_tpt,
2088                                          int weak_tpt, int strong_tpt)
2089 {
2090         /* stay until we have valid tpt */
2091         if (current_tpt == IWL_INVALID_VALUE) {
2092                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2093                 return TPC_ACTION_STAY;
2094         }
2095
2096         /* Too many failures, increase txp */
2097         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2098             current_tpt == 0) {
2099                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2100                 return TPC_ACTION_NO_RESTIRCTION;
2101         }
2102
2103         /* try decreasing first if applicable */
2104         if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2105             weak != TPC_INVALID) {
2106                 if (weak_tpt == IWL_INVALID_VALUE &&
2107                     (strong_tpt == IWL_INVALID_VALUE ||
2108                      current_tpt >= strong_tpt)) {
2109                         IWL_DEBUG_RATE(mvm,
2110                                        "no weak txp measurement. decrease txp\n");
2111                         return TPC_ACTION_DECREASE;
2112                 }
2113
2114                 if (weak_tpt > current_tpt) {
2115                         IWL_DEBUG_RATE(mvm,
2116                                        "lower txp has better tpt. decrease txp\n");
2117                         return TPC_ACTION_DECREASE;
2118                 }
2119         }
2120
2121         /* next, increase if needed */
2122         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2123             strong != TPC_INVALID) {
2124                 if (weak_tpt == IWL_INVALID_VALUE &&
2125                     strong_tpt != IWL_INVALID_VALUE &&
2126                     current_tpt < strong_tpt) {
2127                         IWL_DEBUG_RATE(mvm,
2128                                        "higher txp has better tpt. increase txp\n");
2129                         return TPC_ACTION_INCREASE;
2130                 }
2131
2132                 if (weak_tpt < current_tpt &&
2133                     (strong_tpt == IWL_INVALID_VALUE ||
2134                      strong_tpt > current_tpt)) {
2135                         IWL_DEBUG_RATE(mvm,
2136                                        "lower txp has worse tpt. increase txp\n");
2137                         return TPC_ACTION_INCREASE;
2138                 }
2139         }
2140
2141         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2142         return TPC_ACTION_STAY;
2143 }
2144
2145 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2146                            struct ieee80211_sta *sta,
2147                            struct iwl_lq_sta *lq_sta,
2148                            struct iwl_scale_tbl_info *tbl)
2149 {
2150         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2151         struct ieee80211_vif *vif = mvm_sta->vif;
2152         struct ieee80211_chanctx_conf *chanctx_conf;
2153         enum nl80211_band band;
2154         struct iwl_rate_scale_data *window;
2155         struct rs_rate *rate = &tbl->rate;
2156         enum tpc_action action;
2157         s32 sr;
2158         u8 cur = lq_sta->lq.reduced_tpc;
2159         int current_tpt;
2160         int weak, strong;
2161         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2162
2163 #ifdef CONFIG_MAC80211_DEBUGFS
2164         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2165                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2166                                lq_sta->pers.dbg_fixed_txp_reduction);
2167                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2168                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2169         }
2170 #endif
2171
2172         rcu_read_lock();
2173         chanctx_conf = rcu_dereference(vif->chanctx_conf);
2174         if (WARN_ON(!chanctx_conf))
2175                 band = NUM_NL80211_BANDS;
2176         else
2177                 band = chanctx_conf->def.chan->band;
2178         rcu_read_unlock();
2179
2180         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2181                 IWL_DEBUG_RATE(mvm,
2182                                "tpc is not allowed. remove txp restrictions\n");
2183                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2184                 return cur != TPC_NO_REDUCTION;
2185         }
2186
2187         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2188
2189         /* Collect measured throughputs for current and adjacent rates */
2190         window = tbl->tpc_win;
2191         sr = window[cur].success_ratio;
2192         current_tpt = window[cur].average_tpt;
2193         if (weak != TPC_INVALID)
2194                 weak_tpt = window[weak].average_tpt;
2195         if (strong != TPC_INVALID)
2196                 strong_tpt = window[strong].average_tpt;
2197
2198         IWL_DEBUG_RATE(mvm,
2199                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2200                        cur, current_tpt, sr, weak, strong,
2201                        weak_tpt, strong_tpt);
2202
2203         action = rs_get_tpc_action(mvm, sr, weak, strong,
2204                                    current_tpt, weak_tpt, strong_tpt);
2205
2206         /* override actions if we are on the edge */
2207         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2208                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2209                 action = TPC_ACTION_STAY;
2210         } else if (strong == TPC_INVALID &&
2211                    (action == TPC_ACTION_INCREASE ||
2212                     action == TPC_ACTION_NO_RESTIRCTION)) {
2213                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2214                 action = TPC_ACTION_STAY;
2215         }
2216
2217         switch (action) {
2218         case TPC_ACTION_DECREASE:
2219                 lq_sta->lq.reduced_tpc = weak;
2220                 return true;
2221         case TPC_ACTION_INCREASE:
2222                 lq_sta->lq.reduced_tpc = strong;
2223                 return true;
2224         case TPC_ACTION_NO_RESTIRCTION:
2225                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2226                 return true;
2227         case TPC_ACTION_STAY:
2228                 /* do nothing */
2229                 break;
2230         }
2231         return false;
2232 }
2233
2234 /*
2235  * Do rate scaling and search for new modulation mode.
2236  */
2237 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2238                                   struct ieee80211_sta *sta,
2239                                   struct iwl_lq_sta *lq_sta,
2240                                   int tid, bool ndp)
2241 {
2242         int low = IWL_RATE_INVALID;
2243         int high = IWL_RATE_INVALID;
2244         int index;
2245         struct iwl_rate_scale_data *window = NULL;
2246         int current_tpt = IWL_INVALID_VALUE;
2247         int low_tpt = IWL_INVALID_VALUE;
2248         int high_tpt = IWL_INVALID_VALUE;
2249         u32 fail_count;
2250         enum rs_action scale_action = RS_ACTION_STAY;
2251         u16 rate_mask;
2252         u8 update_lq = 0;
2253         struct iwl_scale_tbl_info *tbl, *tbl1;
2254         u8 active_tbl = 0;
2255         u8 done_search = 0;
2256         u16 high_low;
2257         s32 sr;
2258         u8 prev_agg = lq_sta->is_agg;
2259         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2260         struct iwl_mvm_tid_data *tid_data;
2261         struct rs_rate *rate;
2262
2263         lq_sta->is_agg = !!sta_priv->agg_tids;
2264
2265         /*
2266          * Select rate-scale / modulation-mode table to work with in
2267          * the rest of this function:  "search" if searching for better
2268          * modulation mode, or "active" if doing rate scaling within a mode.
2269          */
2270         if (!lq_sta->search_better_tbl)
2271                 active_tbl = lq_sta->active_tbl;
2272         else
2273                 active_tbl = 1 - lq_sta->active_tbl;
2274
2275         tbl = &(lq_sta->lq_info[active_tbl]);
2276         rate = &tbl->rate;
2277
2278         if (prev_agg != lq_sta->is_agg) {
2279                 IWL_DEBUG_RATE(mvm,
2280                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2281                                prev_agg, lq_sta->is_agg);
2282                 rs_set_expected_tpt_table(lq_sta, tbl);
2283                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2284         }
2285
2286         /* current tx rate */
2287         index = rate->index;
2288
2289         /* rates available for this association, and for modulation mode */
2290         rate_mask = rs_get_supported_rates(lq_sta, rate);
2291
2292         if (!(BIT(index) & rate_mask)) {
2293                 IWL_ERR(mvm, "Current Rate is not valid\n");
2294                 if (lq_sta->search_better_tbl) {
2295                         /* revert to active table if search table is not valid*/
2296                         rate->type = LQ_NONE;
2297                         lq_sta->search_better_tbl = 0;
2298                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2299                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2300                 }
2301                 return;
2302         }
2303
2304         /* Get expected throughput table and history window for current rate */
2305         if (!tbl->expected_tpt) {
2306                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2307                 return;
2308         }
2309
2310         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2311         window = &(tbl->win[index]);
2312
2313         /*
2314          * If there is not enough history to calculate actual average
2315          * throughput, keep analyzing results of more tx frames, without
2316          * changing rate or mode (bypass most of the rest of this function).
2317          * Set up new rate table in uCode only if old rate is not supported
2318          * in current association (use new rate found above).
2319          */
2320         fail_count = window->counter - window->success_counter;
2321         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2322             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2323                 IWL_DEBUG_RATE(mvm,
2324                                "%s: Test Window: succ %d total %d\n",
2325                                rs_pretty_rate(rate),
2326                                window->success_counter, window->counter);
2327
2328                 /* Can't calculate this yet; not enough history */
2329                 window->average_tpt = IWL_INVALID_VALUE;
2330
2331                 /* Should we stay with this modulation mode,
2332                  * or search for a new one? */
2333                 rs_stay_in_table(lq_sta, false);
2334
2335                 return;
2336         }
2337
2338         /* If we are searching for better modulation mode, check success. */
2339         if (lq_sta->search_better_tbl) {
2340                 /* If good success, continue using the "search" mode;
2341                  * no need to send new link quality command, since we're
2342                  * continuing to use the setup that we've been trying. */
2343                 if (window->average_tpt > lq_sta->last_tpt) {
2344                         IWL_DEBUG_RATE(mvm,
2345                                        "SWITCHING TO NEW TABLE SR: %d "
2346                                        "cur-tpt %d old-tpt %d\n",
2347                                        window->success_ratio,
2348                                        window->average_tpt,
2349                                        lq_sta->last_tpt);
2350
2351                         /* Swap tables; "search" becomes "active" */
2352                         lq_sta->active_tbl = active_tbl;
2353                         current_tpt = window->average_tpt;
2354                 /* Else poor success; go back to mode in "active" table */
2355                 } else {
2356                         IWL_DEBUG_RATE(mvm,
2357                                        "GOING BACK TO THE OLD TABLE: SR %d "
2358                                        "cur-tpt %d old-tpt %d\n",
2359                                        window->success_ratio,
2360                                        window->average_tpt,
2361                                        lq_sta->last_tpt);
2362
2363                         /* Nullify "search" table */
2364                         rate->type = LQ_NONE;
2365
2366                         /* Revert to "active" table */
2367                         active_tbl = lq_sta->active_tbl;
2368                         tbl = &(lq_sta->lq_info[active_tbl]);
2369
2370                         /* Revert to "active" rate and throughput info */
2371                         index = tbl->rate.index;
2372                         current_tpt = lq_sta->last_tpt;
2373
2374                         /* Need to set up a new rate table in uCode */
2375                         update_lq = 1;
2376                 }
2377
2378                 /* Either way, we've made a decision; modulation mode
2379                  * search is done, allow rate adjustment next time. */
2380                 lq_sta->search_better_tbl = 0;
2381                 done_search = 1;        /* Don't switch modes below! */
2382                 goto lq_update;
2383         }
2384
2385         /* (Else) not in search of better modulation mode, try for better
2386          * starting rate, while staying in this mode. */
2387         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2388         low = high_low & 0xff;
2389         high = (high_low >> 8) & 0xff;
2390
2391         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2392
2393         sr = window->success_ratio;
2394
2395         /* Collect measured throughputs for current and adjacent rates */
2396         current_tpt = window->average_tpt;
2397         if (low != IWL_RATE_INVALID)
2398                 low_tpt = tbl->win[low].average_tpt;
2399         if (high != IWL_RATE_INVALID)
2400                 high_tpt = tbl->win[high].average_tpt;
2401
2402         IWL_DEBUG_RATE(mvm,
2403                        "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2404                        rs_pretty_rate(rate), current_tpt, sr,
2405                        low, high, low_tpt, high_tpt);
2406
2407         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2408                                           current_tpt, low_tpt, high_tpt);
2409
2410         /* Force a search in case BT doesn't like us being in MIMO */
2411         if (is_mimo(rate) &&
2412             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2413                 IWL_DEBUG_RATE(mvm,
2414                                "BT Coex forbids MIMO. Search for new config\n");
2415                 rs_stay_in_table(lq_sta, true);
2416                 goto lq_update;
2417         }
2418
2419         switch (scale_action) {
2420         case RS_ACTION_DOWNSCALE:
2421                 /* Decrease starting rate, update uCode's rate table */
2422                 if (low != IWL_RATE_INVALID) {
2423                         update_lq = 1;
2424                         index = low;
2425                 } else {
2426                         IWL_DEBUG_RATE(mvm,
2427                                        "At the bottom rate. Can't decrease\n");
2428                 }
2429
2430                 break;
2431         case RS_ACTION_UPSCALE:
2432                 /* Increase starting rate, update uCode's rate table */
2433                 if (high != IWL_RATE_INVALID) {
2434                         update_lq = 1;
2435                         index = high;
2436                 } else {
2437                         IWL_DEBUG_RATE(mvm,
2438                                        "At the top rate. Can't increase\n");
2439                 }
2440
2441                 break;
2442         case RS_ACTION_STAY:
2443                 /* No change */
2444                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2445                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2446                 break;
2447         default:
2448                 break;
2449         }
2450
2451 lq_update:
2452         /* Replace uCode's rate table for the destination station. */
2453         if (update_lq) {
2454                 tbl->rate.index = index;
2455                 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2456                         rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2457                 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2458                 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2459         }
2460
2461         rs_stay_in_table(lq_sta, false);
2462
2463         /*
2464          * Search for new modulation mode if we're:
2465          * 1)  Not changing rates right now
2466          * 2)  Not just finishing up a search
2467          * 3)  Allowing a new search
2468          */
2469         if (!update_lq && !done_search &&
2470             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2471             && window->counter) {
2472                 enum rs_column next_column;
2473
2474                 /* Save current throughput to compare with "search" throughput*/
2475                 lq_sta->last_tpt = current_tpt;
2476
2477                 IWL_DEBUG_RATE(mvm,
2478                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2479                                update_lq, done_search, lq_sta->rs_state,
2480                                window->counter);
2481
2482                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2483                 if (next_column != RS_COLUMN_INVALID) {
2484                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2485                                                       next_column);
2486                         if (!ret)
2487                                 lq_sta->search_better_tbl = 1;
2488                 } else {
2489                         IWL_DEBUG_RATE(mvm,
2490                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2491                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2492                 }
2493
2494                 /* If new "search" mode was selected, set up in uCode table */
2495                 if (lq_sta->search_better_tbl) {
2496                         /* Access the "search" table, clear its history. */
2497                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2498                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2499
2500                         /* Use new "search" start rate */
2501                         index = tbl->rate.index;
2502
2503                         rs_dump_rate(mvm, &tbl->rate,
2504                                      "Switch to SEARCH TABLE:");
2505                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2506                 } else {
2507                         done_search = 1;
2508                 }
2509         }
2510
2511         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2512                 /* If the "active" (non-search) mode was legacy,
2513                  * and we've tried switching antennas,
2514                  * but we haven't been able to try HT modes (not available),
2515                  * stay with best antenna legacy modulation for a while
2516                  * before next round of mode comparisons. */
2517                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2518                 if (is_legacy(&tbl1->rate)) {
2519                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2520
2521                         if (tid != IWL_MAX_TID_COUNT) {
2522                                 tid_data = &sta_priv->tid_data[tid];
2523                                 if (tid_data->state != IWL_AGG_OFF) {
2524                                         IWL_DEBUG_RATE(mvm,
2525                                                        "Stop aggregation on tid %d\n",
2526                                                        tid);
2527                                         ieee80211_stop_tx_ba_session(sta, tid);
2528                                 }
2529                         }
2530                         rs_set_stay_in_table(mvm, 1, lq_sta);
2531                 } else {
2532                 /* If we're in an HT mode, and all 3 mode switch actions
2533                  * have been tried and compared, stay in this best modulation
2534                  * mode for a while before next round of mode comparisons. */
2535                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2536                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2537                             (tid != IWL_MAX_TID_COUNT)) {
2538                                 tid_data = &sta_priv->tid_data[tid];
2539                                 if (tid_data->state == IWL_AGG_OFF && !ndp) {
2540                                         IWL_DEBUG_RATE(mvm,
2541                                                        "try to aggregate tid %d\n",
2542                                                        tid);
2543                                         rs_tl_turn_on_agg(mvm, tid,
2544                                                           lq_sta, sta);
2545                                 }
2546                         }
2547                         rs_set_stay_in_table(mvm, 0, lq_sta);
2548                 }
2549         }
2550 }
2551
2552 struct rs_init_rate_info {
2553         s8 rssi;
2554         u8 rate_idx;
2555 };
2556
2557 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2558         { -60, IWL_RATE_54M_INDEX },
2559         { -64, IWL_RATE_48M_INDEX },
2560         { -68, IWL_RATE_36M_INDEX },
2561         { -80, IWL_RATE_24M_INDEX },
2562         { -84, IWL_RATE_18M_INDEX },
2563         { -85, IWL_RATE_12M_INDEX },
2564         { -86, IWL_RATE_11M_INDEX },
2565         { -88, IWL_RATE_5M_INDEX  },
2566         { -90, IWL_RATE_2M_INDEX  },
2567         { S8_MIN, IWL_RATE_1M_INDEX },
2568 };
2569
2570 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2571         { -60, IWL_RATE_54M_INDEX },
2572         { -64, IWL_RATE_48M_INDEX },
2573         { -72, IWL_RATE_36M_INDEX },
2574         { -80, IWL_RATE_24M_INDEX },
2575         { -84, IWL_RATE_18M_INDEX },
2576         { -85, IWL_RATE_12M_INDEX },
2577         { -87, IWL_RATE_9M_INDEX  },
2578         { S8_MIN, IWL_RATE_6M_INDEX },
2579 };
2580
2581 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2582         { -60, IWL_RATE_MCS_7_INDEX },
2583         { -64, IWL_RATE_MCS_6_INDEX },
2584         { -68, IWL_RATE_MCS_5_INDEX },
2585         { -72, IWL_RATE_MCS_4_INDEX },
2586         { -80, IWL_RATE_MCS_3_INDEX },
2587         { -84, IWL_RATE_MCS_2_INDEX },
2588         { -85, IWL_RATE_MCS_1_INDEX },
2589         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2590 };
2591
2592 /* MCS index 9 is not valid for 20MHz VHT channel width,
2593  * but is ok for 40, 80 and 160MHz channels.
2594  */
2595 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2596         { -60, IWL_RATE_MCS_8_INDEX },
2597         { -64, IWL_RATE_MCS_7_INDEX },
2598         { -68, IWL_RATE_MCS_6_INDEX },
2599         { -72, IWL_RATE_MCS_5_INDEX },
2600         { -80, IWL_RATE_MCS_4_INDEX },
2601         { -84, IWL_RATE_MCS_3_INDEX },
2602         { -85, IWL_RATE_MCS_2_INDEX },
2603         { -87, IWL_RATE_MCS_1_INDEX },
2604         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2605 };
2606
2607 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2608         { -60, IWL_RATE_MCS_9_INDEX },
2609         { -64, IWL_RATE_MCS_8_INDEX },
2610         { -68, IWL_RATE_MCS_7_INDEX },
2611         { -72, IWL_RATE_MCS_6_INDEX },
2612         { -80, IWL_RATE_MCS_5_INDEX },
2613         { -84, IWL_RATE_MCS_4_INDEX },
2614         { -85, IWL_RATE_MCS_3_INDEX },
2615         { -87, IWL_RATE_MCS_2_INDEX },
2616         { -88, IWL_RATE_MCS_1_INDEX },
2617         { S8_MIN, IWL_RATE_MCS_0_INDEX },
2618 };
2619
2620 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2621
2622 /* Init the optimal rate based on STA caps
2623  * This combined with rssi is used to report the last tx rate
2624  * to userspace when we haven't transmitted enough frames.
2625  */
2626 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2627                                  struct ieee80211_sta *sta,
2628                                  struct iwl_lq_sta *lq_sta)
2629 {
2630         struct rs_rate *rate = &lq_sta->optimal_rate;
2631
2632         if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2633                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2634         else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2635                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2636         else if (lq_sta->band == NL80211_BAND_5GHZ)
2637                 rate->type = LQ_LEGACY_A;
2638         else
2639                 rate->type = LQ_LEGACY_G;
2640
2641         rate->bw = rs_bw_from_sta_bw(sta);
2642         rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2643
2644         /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2645
2646         if (is_mimo(rate)) {
2647                 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2648         } else if (is_siso(rate)) {
2649                 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2650         } else {
2651                 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2652
2653                 if (lq_sta->band == NL80211_BAND_5GHZ) {
2654                         lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2655                         lq_sta->optimal_nentries =
2656                                 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2657                 } else {
2658                         lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2659                         lq_sta->optimal_nentries =
2660                                 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2661                 }
2662         }
2663
2664         if (is_vht(rate)) {
2665                 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2666                         lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2667                         lq_sta->optimal_nentries =
2668                                 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2669                 } else {
2670                         lq_sta->optimal_rates = rs_optimal_rates_vht;
2671                         lq_sta->optimal_nentries =
2672                                 ARRAY_SIZE(rs_optimal_rates_vht);
2673                 }
2674         } else if (is_ht(rate)) {
2675                 lq_sta->optimal_rates = rs_optimal_rates_ht;
2676                 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2677         }
2678 }
2679
2680 /* Compute the optimal rate index based on RSSI */
2681 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2682                                            struct iwl_lq_sta *lq_sta)
2683 {
2684         struct rs_rate *rate = &lq_sta->optimal_rate;
2685         int i;
2686
2687         rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2688                                      BITS_PER_LONG);
2689
2690         for (i = 0; i < lq_sta->optimal_nentries; i++) {
2691                 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2692
2693                 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2694                     (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2695                         rate->index = rate_idx;
2696                         break;
2697                 }
2698         }
2699
2700         return rate;
2701 }
2702
2703 /* Choose an initial legacy rate and antenna to use based on the RSSI
2704  * of last Rx
2705  */
2706 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2707                                 struct ieee80211_sta *sta,
2708                                 struct iwl_lq_sta *lq_sta,
2709                                 enum nl80211_band band,
2710                                 struct rs_rate *rate)
2711 {
2712         int i, nentries;
2713         unsigned long active_rate;
2714         s8 best_rssi = S8_MIN;
2715         u8 best_ant = ANT_NONE;
2716         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2717         const struct rs_init_rate_info *initial_rates;
2718
2719         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2720                 if (!(lq_sta->pers.chains & BIT(i)))
2721                         continue;
2722
2723                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2724                         best_rssi = lq_sta->pers.chain_signal[i];
2725                         best_ant = BIT(i);
2726                 }
2727         }
2728
2729         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2730                        rs_pretty_ant(best_ant), best_rssi);
2731
2732         if (best_ant != ANT_A && best_ant != ANT_B)
2733                 rate->ant = first_antenna(valid_tx_ant);
2734         else
2735                 rate->ant = best_ant;
2736
2737         rate->sgi = false;
2738         rate->ldpc = false;
2739         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2740
2741         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2742                                      BITS_PER_LONG);
2743
2744         if (band == NL80211_BAND_5GHZ) {
2745                 rate->type = LQ_LEGACY_A;
2746                 initial_rates = rs_optimal_rates_5ghz_legacy;
2747                 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2748         } else {
2749                 rate->type = LQ_LEGACY_G;
2750                 initial_rates = rs_optimal_rates_24ghz_legacy;
2751                 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2752         }
2753
2754         if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2755                 goto out;
2756
2757         /* Start from a higher rate if the corresponding debug capability
2758          * is enabled. The rate is chosen according to AP capabilities.
2759          * In case of VHT/HT when the rssi is low fallback to the case of
2760          * legacy rates.
2761          */
2762         if (sta->vht_cap.vht_supported &&
2763             best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2764                 switch (sta->bandwidth) {
2765                 case IEEE80211_STA_RX_BW_160:
2766                 case IEEE80211_STA_RX_BW_80:
2767                 case IEEE80211_STA_RX_BW_40:
2768                         initial_rates = rs_optimal_rates_vht;
2769                         nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2770                         break;
2771                 case IEEE80211_STA_RX_BW_20:
2772                         initial_rates = rs_optimal_rates_vht_20mhz;
2773                         nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2774                         break;
2775                 default:
2776                         IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2777                         goto out;
2778                 }
2779
2780                 active_rate = lq_sta->active_siso_rate;
2781                 rate->type = LQ_VHT_SISO;
2782                 rate->bw = rs_bw_from_sta_bw(sta);
2783         } else if (sta->ht_cap.ht_supported &&
2784                    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2785                 initial_rates = rs_optimal_rates_ht;
2786                 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2787                 active_rate = lq_sta->active_siso_rate;
2788                 rate->type = LQ_HT_SISO;
2789         } else {
2790                 active_rate = lq_sta->active_legacy_rate;
2791         }
2792
2793         for (i = 0; i < nentries; i++) {
2794                 int rate_idx = initial_rates[i].rate_idx;
2795
2796                 if ((best_rssi >= initial_rates[i].rssi) &&
2797                     (BIT(rate_idx) & active_rate)) {
2798                         rate->index = rate_idx;
2799                         break;
2800                 }
2801         }
2802
2803 out:
2804         rs_dump_rate(mvm, rate, "INITIAL");
2805 }
2806
2807 /* Save info about RSSI of last Rx */
2808 void rs_update_last_rssi(struct iwl_mvm *mvm,
2809                          struct iwl_lq_sta *lq_sta,
2810                          struct ieee80211_rx_status *rx_status)
2811 {
2812         int i;
2813
2814         lq_sta->pers.chains = rx_status->chains;
2815         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2816         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2817         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2818         lq_sta->pers.last_rssi = S8_MIN;
2819
2820         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2821                 if (!(lq_sta->pers.chains & BIT(i)))
2822                         continue;
2823
2824                 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2825                         lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2826         }
2827 }
2828
2829 /**
2830  * rs_initialize_lq - Initialize a station's hardware rate table
2831  *
2832  * The uCode's station table contains a table of fallback rates
2833  * for automatic fallback during transmission.
2834  *
2835  * NOTE: This sets up a default set of values.  These will be replaced later
2836  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2837  *       rc80211_simple.
2838  *
2839  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2840  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2841  *       which requires station table entry to exist).
2842  */
2843 static void rs_initialize_lq(struct iwl_mvm *mvm,
2844                              struct ieee80211_sta *sta,
2845                              struct iwl_lq_sta *lq_sta,
2846                              enum nl80211_band band,
2847                              bool init)
2848 {
2849         struct iwl_scale_tbl_info *tbl;
2850         struct rs_rate *rate;
2851         u8 active_tbl = 0;
2852
2853         if (!sta || !lq_sta)
2854                 return;
2855
2856         if (!lq_sta->search_better_tbl)
2857                 active_tbl = lq_sta->active_tbl;
2858         else
2859                 active_tbl = 1 - lq_sta->active_tbl;
2860
2861         tbl = &(lq_sta->lq_info[active_tbl]);
2862         rate = &tbl->rate;
2863
2864         rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2865         rs_init_optimal_rate(mvm, sta, lq_sta);
2866
2867         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2868         tbl->column = rs_get_column_from_rate(rate);
2869
2870         rs_set_expected_tpt_table(lq_sta, tbl);
2871         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2872         /* TODO restore station should remember the lq cmd */
2873         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2874 }
2875
2876 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2877                         struct ieee80211_tx_rate_control *txrc)
2878 {
2879         struct sk_buff *skb = txrc->skb;
2880         struct iwl_op_mode *op_mode __maybe_unused =
2881                         (struct iwl_op_mode *)mvm_r;
2882         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2883         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2884         struct iwl_lq_sta *lq_sta = mvm_sta;
2885         struct rs_rate *optimal_rate;
2886         u32 last_ucode_rate;
2887
2888         if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2889                 /* if vif isn't initialized mvm doesn't know about
2890                  * this station, so don't do anything with the it
2891                  */
2892                 sta = NULL;
2893                 mvm_sta = NULL;
2894         }
2895
2896         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2897
2898         /* Treat uninitialized rate scaling data same as non-existing. */
2899         if (lq_sta && !lq_sta->pers.drv) {
2900                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2901                 mvm_sta = NULL;
2902         }
2903
2904         /* Send management frames and NO_ACK data using lowest rate. */
2905         if (rate_control_send_low(sta, mvm_sta, txrc))
2906                 return;
2907
2908         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2909                                   info->band, &info->control.rates[0]);
2910         info->control.rates[0].count = 1;
2911
2912         /* Report the optimal rate based on rssi and STA caps if we haven't
2913          * converged yet (too little traffic) or exploring other modulations
2914          */
2915         if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2916                 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2917                 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2918                                                           optimal_rate);
2919                 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2920                                           &txrc->reported_rate);
2921         }
2922 }
2923
2924 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2925                           gfp_t gfp)
2926 {
2927         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2928         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2929         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2930         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2931
2932         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2933
2934         lq_sta->pers.drv = mvm;
2935 #ifdef CONFIG_MAC80211_DEBUGFS
2936         lq_sta->pers.dbg_fixed_rate = 0;
2937         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2938         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2939 #endif
2940         lq_sta->pers.chains = 0;
2941         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2942         lq_sta->pers.last_rssi = S8_MIN;
2943
2944         return &sta_priv->lq_sta;
2945 }
2946
2947 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2948                                        int nss)
2949 {
2950         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2951                 (0x3 << (2 * (nss - 1)));
2952         rx_mcs >>= (2 * (nss - 1));
2953
2954         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2955                 return IWL_RATE_MCS_7_INDEX;
2956         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2957                 return IWL_RATE_MCS_8_INDEX;
2958         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2959                 return IWL_RATE_MCS_9_INDEX;
2960
2961         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2962         return -1;
2963 }
2964
2965 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2966                                      struct ieee80211_sta_vht_cap *vht_cap,
2967                                      struct iwl_lq_sta *lq_sta)
2968 {
2969         int i;
2970         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2971
2972         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2973                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2974                         if (i == IWL_RATE_9M_INDEX)
2975                                 continue;
2976
2977                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2978                         if (i == IWL_RATE_MCS_9_INDEX &&
2979                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2980                                 continue;
2981
2982                         lq_sta->active_siso_rate |= BIT(i);
2983                 }
2984         }
2985
2986         if (sta->rx_nss < 2)
2987                 return;
2988
2989         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2990         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2991                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2992                         if (i == IWL_RATE_9M_INDEX)
2993                                 continue;
2994
2995                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2996                         if (i == IWL_RATE_MCS_9_INDEX &&
2997                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2998                                 continue;
2999
3000                         lq_sta->active_mimo2_rate |= BIT(i);
3001                 }
3002         }
3003 }
3004
3005 static void rs_ht_init(struct iwl_mvm *mvm,
3006                        struct ieee80211_sta *sta,
3007                        struct iwl_lq_sta *lq_sta,
3008                        struct ieee80211_sta_ht_cap *ht_cap)
3009 {
3010         /* active_siso_rate mask includes 9 MBits (bit 5),
3011          * and CCK (bits 0-3), supp_rates[] does not;
3012          * shift to convert format, force 9 MBits off.
3013          */
3014         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
3015         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
3016         lq_sta->active_siso_rate &= ~((u16)0x2);
3017         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
3018
3019         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
3020         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
3021         lq_sta->active_mimo2_rate &= ~((u16)0x2);
3022         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
3023
3024         if (mvm->cfg->ht_params->ldpc &&
3025             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
3026                 lq_sta->ldpc = true;
3027
3028         if (mvm->cfg->ht_params->stbc &&
3029             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3030             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3031                 lq_sta->stbc_capable = true;
3032
3033         lq_sta->is_vht = false;
3034 }
3035
3036 static void rs_vht_init(struct iwl_mvm *mvm,
3037                         struct ieee80211_sta *sta,
3038                         struct iwl_lq_sta *lq_sta,
3039                         struct ieee80211_sta_vht_cap *vht_cap)
3040 {
3041         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
3042
3043         if (mvm->cfg->ht_params->ldpc &&
3044             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3045                 lq_sta->ldpc = true;
3046
3047         if (mvm->cfg->ht_params->stbc &&
3048             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3049             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3050                 lq_sta->stbc_capable = true;
3051
3052         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3053             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3054             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3055                 lq_sta->bfer_capable = true;
3056
3057         lq_sta->is_vht = true;
3058 }
3059
3060 #ifdef CONFIG_IWLWIFI_DEBUGFS
3061 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3062 {
3063         spin_lock_bh(&mvm->drv_stats_lock);
3064         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3065         spin_unlock_bh(&mvm->drv_stats_lock);
3066 }
3067
3068 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3069 {
3070         u8 nss = 0;
3071
3072         spin_lock(&mvm->drv_stats_lock);
3073
3074         if (agg)
3075                 mvm->drv_rx_stats.agg_frames++;
3076
3077         mvm->drv_rx_stats.success_frames++;
3078
3079         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3080         case RATE_MCS_CHAN_WIDTH_20:
3081                 mvm->drv_rx_stats.bw_20_frames++;
3082                 break;
3083         case RATE_MCS_CHAN_WIDTH_40:
3084                 mvm->drv_rx_stats.bw_40_frames++;
3085                 break;
3086         case RATE_MCS_CHAN_WIDTH_80:
3087                 mvm->drv_rx_stats.bw_80_frames++;
3088                 break;
3089         case RATE_MCS_CHAN_WIDTH_160:
3090                 mvm->drv_rx_stats.bw_160_frames++;
3091                 break;
3092         default:
3093                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3094         }
3095
3096         if (rate & RATE_MCS_HT_MSK) {
3097                 mvm->drv_rx_stats.ht_frames++;
3098                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3099         } else if (rate & RATE_MCS_VHT_MSK) {
3100                 mvm->drv_rx_stats.vht_frames++;
3101                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3102                        RATE_VHT_MCS_NSS_POS) + 1;
3103         } else {
3104                 mvm->drv_rx_stats.legacy_frames++;
3105         }
3106
3107         if (nss == 1)
3108                 mvm->drv_rx_stats.siso_frames++;
3109         else if (nss == 2)
3110                 mvm->drv_rx_stats.mimo2_frames++;
3111
3112         if (rate & RATE_MCS_SGI_MSK)
3113                 mvm->drv_rx_stats.sgi_frames++;
3114         else
3115                 mvm->drv_rx_stats.ngi_frames++;
3116
3117         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3118         mvm->drv_rx_stats.last_frame_idx =
3119                 (mvm->drv_rx_stats.last_frame_idx + 1) %
3120                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3121
3122         spin_unlock(&mvm->drv_stats_lock);
3123 }
3124 #endif
3125
3126 /*
3127  * Called after adding a new station to initialize rate scaling
3128  */
3129 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3130                           enum nl80211_band band, bool init)
3131 {
3132         int i, j;
3133         struct ieee80211_hw *hw = mvm->hw;
3134         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3135         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3136         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
3137         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
3138         struct ieee80211_supported_band *sband;
3139         unsigned long supp; /* must be unsigned long for for_each_set_bit */
3140
3141         /* clear all non-persistent lq data */
3142         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3143
3144         sband = hw->wiphy->bands[band];
3145
3146         lq_sta->lq.sta_id = sta_priv->sta_id;
3147         sta_priv->tlc_amsdu = false;
3148
3149         for (j = 0; j < LQ_SIZE; j++)
3150                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3151
3152         lq_sta->flush_timer = 0;
3153         lq_sta->last_tx = jiffies;
3154
3155         IWL_DEBUG_RATE(mvm,
3156                        "LQ: *** rate scale station global init for station %d ***\n",
3157                        sta_priv->sta_id);
3158         /* TODO: what is a good starting rate for STA? About middle? Maybe not
3159          * the lowest or the highest rate.. Could consider using RSSI from
3160          * previous packets? Need to have IEEE 802.1X auth succeed immediately
3161          * after assoc.. */
3162
3163         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3164         lq_sta->band = sband->band;
3165         /*
3166          * active legacy rates as per supported rates bitmap
3167          */
3168         supp = sta->supp_rates[sband->band];
3169         lq_sta->active_legacy_rate = 0;
3170         for_each_set_bit(i, &supp, BITS_PER_LONG)
3171                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3172
3173         /* TODO: should probably account for rx_highest for both HT/VHT */
3174         if (!vht_cap || !vht_cap->vht_supported)
3175                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3176         else
3177                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3178
3179         lq_sta->max_legacy_rate_idx =
3180                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3181         lq_sta->max_siso_rate_idx =
3182                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3183         lq_sta->max_mimo2_rate_idx =
3184                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3185
3186         IWL_DEBUG_RATE(mvm,
3187                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3188                        lq_sta->active_legacy_rate,
3189                        lq_sta->active_siso_rate,
3190                        lq_sta->active_mimo2_rate,
3191                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3192                        lq_sta->bfer_capable);
3193         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3194                        lq_sta->max_legacy_rate_idx,
3195                        lq_sta->max_siso_rate_idx,
3196                        lq_sta->max_mimo2_rate_idx);
3197
3198         /* These values will be overridden later */
3199         lq_sta->lq.single_stream_ant_msk =
3200                 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3201         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3202
3203         /* as default allow aggregation for all tids */
3204         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3205         lq_sta->is_agg = 0;
3206 #ifdef CONFIG_IWLWIFI_DEBUGFS
3207         iwl_mvm_reset_frame_stats(mvm);
3208 #endif
3209         rs_initialize_lq(mvm, sta, lq_sta, band, init);
3210 }
3211
3212 static void rs_rate_update(void *mvm_r,
3213                            struct ieee80211_supported_band *sband,
3214                            struct cfg80211_chan_def *chandef,
3215                            struct ieee80211_sta *sta, void *priv_sta,
3216                            u32 changed)
3217 {
3218         u8 tid;
3219         struct iwl_op_mode *op_mode  =
3220                         (struct iwl_op_mode *)mvm_r;
3221         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3222
3223         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3224                 return;
3225
3226         /* Stop any ongoing aggregations as rs starts off assuming no agg */
3227         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3228                 ieee80211_stop_tx_ba_session(sta, tid);
3229
3230         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3231 }
3232
3233 #ifdef CONFIG_MAC80211_DEBUGFS
3234 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3235                                             struct iwl_lq_cmd *lq_cmd,
3236                                             enum nl80211_band band,
3237                                             u32 ucode_rate)
3238 {
3239         struct rs_rate rate;
3240         int i;
3241         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3242         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3243         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3244
3245         for (i = 0; i < num_rates; i++)
3246                 lq_cmd->rs_table[i] = ucode_rate_le32;
3247
3248         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
3249
3250         if (is_mimo(&rate))
3251                 lq_cmd->mimo_delim = num_rates - 1;
3252         else
3253                 lq_cmd->mimo_delim = 0;
3254
3255         lq_cmd->reduced_tpc = 0;
3256
3257         if (num_of_ant(ant) == 1)
3258                 lq_cmd->single_stream_ant_msk = ant;
3259
3260         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3261 }
3262 #endif /* CONFIG_MAC80211_DEBUGFS */
3263
3264 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3265                                      struct iwl_lq_sta *lq_sta,
3266                                      struct rs_rate *rate,
3267                                      __le32 *rs_table, int *rs_table_index,
3268                                      int num_rates, int num_retries,
3269                                      u8 valid_tx_ant, bool toggle_ant)
3270 {
3271         int i, j;
3272         __le32 ucode_rate;
3273         bool bottom_reached = false;
3274         int prev_rate_idx = rate->index;
3275         int end = LINK_QUAL_MAX_RETRY_NUM;
3276         int index = *rs_table_index;
3277
3278         for (i = 0; i < num_rates && index < end; i++) {
3279                 for (j = 0; j < num_retries && index < end; j++, index++) {
3280                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3281                                                                          rate));
3282                         rs_table[index] = ucode_rate;
3283                         if (toggle_ant)
3284                                 rs_toggle_antenna(valid_tx_ant, rate);
3285                 }
3286
3287                 prev_rate_idx = rate->index;
3288                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3289                 if (bottom_reached && !is_legacy(rate))
3290                         break;
3291         }
3292
3293         if (!bottom_reached && !is_legacy(rate))
3294                 rate->index = prev_rate_idx;
3295
3296         *rs_table_index = index;
3297 }
3298
3299 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3300  * column the rate table should look like this:
3301  *
3302  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3303  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3304  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3305  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3306  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3307  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3308  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3309  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3310  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3311  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3312  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3313  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3314  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3315  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3316  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3317  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3318  */
3319 static void rs_build_rates_table(struct iwl_mvm *mvm,
3320                                  struct ieee80211_sta *sta,
3321                                  struct iwl_lq_sta *lq_sta,
3322                                  const struct rs_rate *initial_rate)
3323 {
3324         struct rs_rate rate;
3325         int num_rates, num_retries, index = 0;
3326         u8 valid_tx_ant = 0;
3327         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3328         bool toggle_ant = false;
3329
3330         memcpy(&rate, initial_rate, sizeof(rate));
3331
3332         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3333
3334         /* TODO: remove old API when min FW API hits 14 */
3335         if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3336             rs_stbc_allow(mvm, sta, lq_sta))
3337                 rate.stbc = true;
3338
3339         if (is_siso(&rate)) {
3340                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3341                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3342         } else if (is_mimo(&rate)) {
3343                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3344                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3345         } else {
3346                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3347                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3348                 toggle_ant = true;
3349         }
3350
3351         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3352                                  num_rates, num_retries, valid_tx_ant,
3353                                  toggle_ant);
3354
3355         rs_get_lower_rate_down_column(lq_sta, &rate);
3356
3357         if (is_siso(&rate)) {
3358                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3359                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3360                 lq_cmd->mimo_delim = index;
3361         } else if (is_legacy(&rate)) {
3362                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3363                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3364         } else {
3365                 WARN_ON_ONCE(1);
3366         }
3367
3368         toggle_ant = true;
3369
3370         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3371                                  num_rates, num_retries, valid_tx_ant,
3372                                  toggle_ant);
3373
3374         rs_get_lower_rate_down_column(lq_sta, &rate);
3375
3376         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3377         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3378
3379         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3380                                  num_rates, num_retries, valid_tx_ant,
3381                                  toggle_ant);
3382
3383 }
3384
3385 struct rs_bfer_active_iter_data {
3386         struct ieee80211_sta *exclude_sta;
3387         struct iwl_mvm_sta *bfer_mvmsta;
3388 };
3389
3390 static void rs_bfer_active_iter(void *_data,
3391                                 struct ieee80211_sta *sta)
3392 {
3393         struct rs_bfer_active_iter_data *data = _data;
3394         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3395         struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3396         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3397
3398         if (sta == data->exclude_sta)
3399                 return;
3400
3401         /* The current sta has BFER allowed */
3402         if (ss_params & LQ_SS_BFER_ALLOWED) {
3403                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3404
3405                 data->bfer_mvmsta = mvmsta;
3406         }
3407 }
3408
3409 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3410 {
3411         int prio = -1;
3412         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3413
3414         switch (viftype) {
3415         case NL80211_IFTYPE_AP:
3416         case NL80211_IFTYPE_P2P_GO:
3417                 prio = 3;
3418                 break;
3419         case NL80211_IFTYPE_P2P_CLIENT:
3420                 prio = 2;
3421                 break;
3422         case NL80211_IFTYPE_STATION:
3423                 prio = 1;
3424                 break;
3425         default:
3426                 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3427                 prio = -1;
3428         }
3429
3430         return prio;
3431 }
3432
3433 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3434 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3435                                 struct iwl_mvm_sta *sta2)
3436 {
3437         int prio1 = rs_bfer_priority(sta1);
3438         int prio2 = rs_bfer_priority(sta2);
3439
3440         if (prio1 > prio2)
3441                 return 1;
3442         if (prio1 < prio2)
3443                 return -1;
3444         return 0;
3445 }
3446
3447 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3448                                 struct ieee80211_sta *sta,
3449                                 struct iwl_lq_sta *lq_sta,
3450                                 const struct rs_rate *initial_rate)
3451 {
3452         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3453         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3454         struct rs_bfer_active_iter_data data = {
3455                 .exclude_sta = sta,
3456                 .bfer_mvmsta = NULL,
3457         };
3458         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3459         u32 ss_params = LQ_SS_PARAMS_VALID;
3460
3461         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3462                 goto out;
3463
3464 #ifdef CONFIG_MAC80211_DEBUGFS
3465         /* Check if forcing the decision is configured.
3466          * Note that SISO is forced by not allowing STBC or BFER
3467          */
3468         if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3469                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3470         else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3471                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3472
3473         if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3474                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3475                                lq_sta->pers.ss_force);
3476                 goto out;
3477         }
3478 #endif
3479
3480         if (lq_sta->stbc_capable)
3481                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3482
3483         if (!lq_sta->bfer_capable)
3484                 goto out;
3485
3486         ieee80211_iterate_stations_atomic(mvm->hw,
3487                                           rs_bfer_active_iter,
3488                                           &data);
3489         bfer_mvmsta = data.bfer_mvmsta;
3490
3491         /* This code is safe as it doesn't run concurrently for different
3492          * stations. This is guaranteed by the fact that calls to
3493          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3494          */
3495         if (!bfer_mvmsta) {
3496                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3497
3498                 ss_params |= LQ_SS_BFER_ALLOWED;
3499                 goto out;
3500         }
3501
3502         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3503                        bfer_mvmsta->sta_id);
3504
3505         /* Disallow BFER on another STA if active and we're a higher priority */
3506         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3507                 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3508                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3509
3510                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3511                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3512                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3513
3514                 ss_params |= LQ_SS_BFER_ALLOWED;
3515                 IWL_DEBUG_RATE(mvm,
3516                                "Lower priority BFER sta found (%d). Switch BFER\n",
3517                                bfer_mvmsta->sta_id);
3518         }
3519 out:
3520         lq_cmd->ss_params = cpu_to_le32(ss_params);
3521 }
3522
3523 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3524                            struct ieee80211_sta *sta,
3525                            struct iwl_lq_sta *lq_sta,
3526                            const struct rs_rate *initial_rate)
3527 {
3528         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3529         struct iwl_mvm_sta *mvmsta;
3530         struct iwl_mvm_vif *mvmvif;
3531
3532         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3533         lq_cmd->agg_time_limit =
3534                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3535
3536 #ifdef CONFIG_MAC80211_DEBUGFS
3537         if (lq_sta->pers.dbg_fixed_rate) {
3538                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3539                                                 lq_sta->band,
3540                                                 lq_sta->pers.dbg_fixed_rate);
3541                 return;
3542         }
3543 #endif
3544         if (WARN_ON_ONCE(!sta || !initial_rate))
3545                 return;
3546
3547         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3548
3549         if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3550                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3551
3552         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3553         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3554
3555         if (num_of_ant(initial_rate->ant) == 1)
3556                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3557
3558         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3559
3560         /*
3561          * In case of low latency, tell the firmware to leave a frame in the
3562          * Tx Fifo so that it can start a transaction in the same TxOP. This
3563          * basically allows the firmware to send bursts.
3564          */
3565         if (iwl_mvm_vif_low_latency(mvmvif))
3566                 lq_cmd->agg_frame_cnt_limit--;
3567
3568         if (mvmsta->vif->p2p)
3569                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3570
3571         lq_cmd->agg_time_limit =
3572                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3573 }
3574
3575 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3576 {
3577         return hw->priv;
3578 }
3579 /* rate scale requires free function to be implemented */
3580 static void rs_free(void *mvm_rate)
3581 {
3582         return;
3583 }
3584
3585 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3586                         void *mvm_sta)
3587 {
3588         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3589         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3590
3591         IWL_DEBUG_RATE(mvm, "enter\n");
3592         IWL_DEBUG_RATE(mvm, "leave\n");
3593 }
3594
3595 #ifdef CONFIG_MAC80211_DEBUGFS
3596 int rs_pretty_print_rate(char *buf, const u32 rate)
3597 {
3598
3599         char *type, *bw;
3600         u8 mcs = 0, nss = 0;
3601         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3602
3603         if (!(rate & RATE_MCS_HT_MSK) &&
3604             !(rate & RATE_MCS_VHT_MSK)) {
3605                 int index = iwl_hwrate_to_plcp_idx(rate);
3606
3607                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3608                                rs_pretty_ant(ant),
3609                                index == IWL_RATE_INVALID ? "BAD" :
3610                                iwl_rate_mcs[index].mbps);
3611         }
3612
3613         if (rate & RATE_MCS_VHT_MSK) {
3614                 type = "VHT";
3615                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3616                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3617                        >> RATE_VHT_MCS_NSS_POS) + 1;
3618         } else if (rate & RATE_MCS_HT_MSK) {
3619                 type = "HT";
3620                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3621                 nss = ((rate & RATE_HT_MCS_NSS_MSK)
3622                        >> RATE_HT_MCS_NSS_POS) + 1;
3623         } else {
3624                 type = "Unknown"; /* shouldn't happen */
3625         }
3626
3627         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3628         case RATE_MCS_CHAN_WIDTH_20:
3629                 bw = "20Mhz";
3630                 break;
3631         case RATE_MCS_CHAN_WIDTH_40:
3632                 bw = "40Mhz";
3633                 break;
3634         case RATE_MCS_CHAN_WIDTH_80:
3635                 bw = "80Mhz";
3636                 break;
3637         case RATE_MCS_CHAN_WIDTH_160:
3638                 bw = "160Mhz";
3639                 break;
3640         default:
3641                 bw = "BAD BW";
3642         }
3643
3644         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n",
3645                        type, rs_pretty_ant(ant), bw, mcs, nss,
3646                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3647                        (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3648                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3649                        (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3650 }
3651
3652 /**
3653  * Program the device to use fixed rate for frame transmit
3654  * This is for debugging/testing only
3655  * once the device start use fixed rate, we need to reload the module
3656  * to being back the normal operation.
3657  */
3658 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3659                                 struct iwl_lq_sta *lq_sta)
3660 {
3661         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3662         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3663         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3664
3665         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3666                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3667
3668         if (lq_sta->pers.dbg_fixed_rate) {
3669                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3670                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3671         }
3672 }
3673
3674 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3675                         const char __user *user_buf, size_t count, loff_t *ppos)
3676 {
3677         struct iwl_lq_sta *lq_sta = file->private_data;
3678         struct iwl_mvm *mvm;
3679         char buf[64];
3680         size_t buf_size;
3681         u32 parsed_rate;
3682
3683         mvm = lq_sta->pers.drv;
3684         memset(buf, 0, sizeof(buf));
3685         buf_size = min(count, sizeof(buf) -  1);
3686         if (copy_from_user(buf, user_buf, buf_size))
3687                 return -EFAULT;
3688
3689         if (sscanf(buf, "%x", &parsed_rate) == 1)
3690                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3691         else
3692                 lq_sta->pers.dbg_fixed_rate = 0;
3693
3694         rs_program_fix_rate(mvm, lq_sta);
3695
3696         return count;
3697 }
3698
3699 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3700                         char __user *user_buf, size_t count, loff_t *ppos)
3701 {
3702         char *buff;
3703         int desc = 0;
3704         int i = 0;
3705         ssize_t ret;
3706
3707         struct iwl_lq_sta *lq_sta = file->private_data;
3708         struct iwl_mvm_sta *mvmsta =
3709                 container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3710         struct iwl_mvm *mvm;
3711         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3712         struct rs_rate *rate = &tbl->rate;
3713         u32 ss_params;
3714
3715         mvm = lq_sta->pers.drv;
3716         buff = kmalloc(2048, GFP_KERNEL);
3717         if (!buff)
3718                 return -ENOMEM;
3719
3720         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3721         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3722                         lq_sta->total_failed, lq_sta->total_success,
3723                         lq_sta->active_legacy_rate);
3724         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3725                         lq_sta->pers.dbg_fixed_rate);
3726         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3727             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3728             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3729             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3730         desc += sprintf(buff+desc, "lq type %s\n",
3731                         (is_legacy(rate)) ? "legacy" :
3732                         is_vht(rate) ? "VHT" : "HT");
3733         if (!is_legacy(rate)) {
3734                 desc += sprintf(buff + desc, " %s",
3735                    (is_siso(rate)) ? "SISO" : "MIMO2");
3736                 desc += sprintf(buff + desc, " %s",
3737                                 (is_ht20(rate)) ? "20MHz" :
3738                                 (is_ht40(rate)) ? "40MHz" :
3739                                 (is_ht80(rate)) ? "80MHz" :
3740                                 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3741                 desc += sprintf(buff + desc, " %s %s %s %s\n",
3742                                 (rate->sgi) ? "SGI" : "NGI",
3743                                 (rate->ldpc) ? "LDPC" : "BCC",
3744                                 (lq_sta->is_agg) ? "AGG on" : "",
3745                                 (mvmsta->tlc_amsdu) ? "AMSDU on" : "");
3746         }
3747         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3748                         lq_sta->last_rate_n_flags);
3749         desc += sprintf(buff+desc,
3750                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3751                         lq_sta->lq.flags,
3752                         lq_sta->lq.mimo_delim,
3753                         lq_sta->lq.single_stream_ant_msk,
3754                         lq_sta->lq.dual_stream_ant_msk);
3755
3756         desc += sprintf(buff+desc,
3757                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3758                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3759                         lq_sta->lq.agg_disable_start_th,
3760                         lq_sta->lq.agg_frame_cnt_limit);
3761
3762         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3763         ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3764         desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3765                         (ss_params & LQ_SS_PARAMS_VALID) ?
3766                         "VALID" : "INVALID",
3767                         (ss_params & LQ_SS_BFER_ALLOWED) ?
3768                         ", BFER" : "",
3769                         (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3770                         ", STBC" : "",
3771                         (ss_params & LQ_SS_FORCE) ?
3772                         ", FORCE" : "");
3773         desc += sprintf(buff+desc,
3774                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3775                         lq_sta->lq.initial_rate_index[0],
3776                         lq_sta->lq.initial_rate_index[1],
3777                         lq_sta->lq.initial_rate_index[2],
3778                         lq_sta->lq.initial_rate_index[3]);
3779
3780         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3781                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3782
3783                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3784                 desc += rs_pretty_print_rate(buff+desc, r);
3785         }
3786
3787         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3788         kfree(buff);
3789         return ret;
3790 }
3791
3792 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3793         .write = rs_sta_dbgfs_scale_table_write,
3794         .read = rs_sta_dbgfs_scale_table_read,
3795         .open = simple_open,
3796         .llseek = default_llseek,
3797 };
3798 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3799                         char __user *user_buf, size_t count, loff_t *ppos)
3800 {
3801         char *buff;
3802         int desc = 0;
3803         int i, j;
3804         ssize_t ret;
3805         struct iwl_scale_tbl_info *tbl;
3806         struct rs_rate *rate;
3807         struct iwl_lq_sta *lq_sta = file->private_data;
3808
3809         buff = kmalloc(1024, GFP_KERNEL);
3810         if (!buff)
3811                 return -ENOMEM;
3812
3813         for (i = 0; i < LQ_SIZE; i++) {
3814                 tbl = &(lq_sta->lq_info[i]);
3815                 rate = &tbl->rate;
3816                 desc += sprintf(buff+desc,
3817                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3818                                 "index=%d\n",
3819                                 lq_sta->active_tbl == i ? "*" : "x",
3820                                 rate->type,
3821                                 rate->sgi,
3822                                 is_ht20(rate) ? "20MHz" :
3823                                 is_ht40(rate) ? "40MHz" :
3824                                 is_ht80(rate) ? "80MHz" :
3825                                 is_ht160(rate) ? "160MHz" : "ERR",
3826                                 rate->index);
3827                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3828                         desc += sprintf(buff+desc,
3829                                 "counter=%d success=%d %%=%d\n",
3830                                 tbl->win[j].counter,
3831                                 tbl->win[j].success_counter,
3832                                 tbl->win[j].success_ratio);
3833                 }
3834         }
3835         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3836         kfree(buff);
3837         return ret;
3838 }
3839
3840 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3841         .read = rs_sta_dbgfs_stats_table_read,
3842         .open = simple_open,
3843         .llseek = default_llseek,
3844 };
3845
3846 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3847                                               char __user *user_buf,
3848                                               size_t count, loff_t *ppos)
3849 {
3850         static const char * const column_name[] = {
3851                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3852                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3853                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3854                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3855                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3856                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3857                 [RS_COLUMN_MIMO2] = "MIMO2",
3858                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3859         };
3860
3861         static const char * const rate_name[] = {
3862                 [IWL_RATE_1M_INDEX] = "1M",
3863                 [IWL_RATE_2M_INDEX] = "2M",
3864                 [IWL_RATE_5M_INDEX] = "5.5M",
3865                 [IWL_RATE_11M_INDEX] = "11M",
3866                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3867                 [IWL_RATE_9M_INDEX] = "9M",
3868                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3869                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3870                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3871                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3872                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3873                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3874                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3875                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3876                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3877         };
3878
3879         char *buff, *pos, *endpos;
3880         int col, rate;
3881         ssize_t ret;
3882         struct iwl_lq_sta *lq_sta = file->private_data;
3883         struct rs_rate_stats *stats;
3884         static const size_t bufsz = 1024;
3885
3886         buff = kmalloc(bufsz, GFP_KERNEL);
3887         if (!buff)
3888                 return -ENOMEM;
3889
3890         pos = buff;
3891         endpos = pos + bufsz;
3892
3893         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3894         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3895                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3896         pos += scnprintf(pos, endpos - pos, "\n");
3897
3898         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3899                 pos += scnprintf(pos, endpos - pos,
3900                                  "%s,", column_name[col]);
3901
3902                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3903                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3904                         pos += scnprintf(pos, endpos - pos,
3905                                          "%llu/%llu,",
3906                                          stats->success,
3907                                          stats->total);
3908                 }
3909                 pos += scnprintf(pos, endpos - pos, "\n");
3910         }
3911
3912         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3913         kfree(buff);
3914         return ret;
3915 }
3916
3917 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3918                                                const char __user *user_buf,
3919                                                size_t count, loff_t *ppos)
3920 {
3921         struct iwl_lq_sta *lq_sta = file->private_data;
3922         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3923
3924         return count;
3925 }
3926
3927 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3928         .read = rs_sta_dbgfs_drv_tx_stats_read,
3929         .write = rs_sta_dbgfs_drv_tx_stats_write,
3930         .open = simple_open,
3931         .llseek = default_llseek,
3932 };
3933
3934 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3935                                        char __user *user_buf,
3936                                        size_t count, loff_t *ppos)
3937 {
3938         struct iwl_lq_sta *lq_sta = file->private_data;
3939         char buf[12];
3940         int bufsz = sizeof(buf);
3941         int pos = 0;
3942         static const char * const ss_force_name[] = {
3943                 [RS_SS_FORCE_NONE] = "none",
3944                 [RS_SS_FORCE_STBC] = "stbc",
3945                 [RS_SS_FORCE_BFER] = "bfer",
3946                 [RS_SS_FORCE_SISO] = "siso",
3947         };
3948
3949         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3950                          ss_force_name[lq_sta->pers.ss_force]);
3951         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3952 }
3953
3954 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3955                                         size_t count, loff_t *ppos)
3956 {
3957         struct iwl_mvm *mvm = lq_sta->pers.drv;
3958         int ret = 0;
3959
3960         if (!strncmp("none", buf, 4)) {
3961                 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3962         } else if (!strncmp("siso", buf, 4)) {
3963                 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3964         } else if (!strncmp("stbc", buf, 4)) {
3965                 if (lq_sta->stbc_capable) {
3966                         lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3967                 } else {
3968                         IWL_ERR(mvm,
3969                                 "can't force STBC. peer doesn't support\n");
3970                         ret = -EINVAL;
3971                 }
3972         } else if (!strncmp("bfer", buf, 4)) {
3973                 if (lq_sta->bfer_capable) {
3974                         lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3975                 } else {
3976                         IWL_ERR(mvm,
3977                                 "can't force BFER. peer doesn't support\n");
3978                         ret = -EINVAL;
3979                 }
3980         } else {
3981                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3982                 ret = -EINVAL;
3983         }
3984         return ret ?: count;
3985 }
3986
3987 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3988         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3989 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
3990                 if (!debugfs_create_file(#name, mode, parent, lq_sta,   \
3991                                          &iwl_dbgfs_##name##_ops))      \
3992                         goto err;                                       \
3993         } while (0)
3994
3995 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3996
3997 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
3998 {
3999         struct iwl_lq_sta *lq_sta = priv_sta;
4000         struct iwl_mvm_sta *mvmsta;
4001
4002         mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
4003
4004         if (!mvmsta->vif)
4005                 return;
4006
4007         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
4008                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
4009         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
4010                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
4011         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
4012                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4013         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
4014                           &lq_sta->tx_agg_tid_en);
4015         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
4016                           &lq_sta->pers.dbg_fixed_txp_reduction);
4017
4018         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
4019         return;
4020 err:
4021         IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
4022 }
4023
4024 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
4025 {
4026 }
4027 #endif
4028
4029 /*
4030  * Initialization of rate scaling information is done by driver after
4031  * the station is added. Since mac80211 calls this function before a
4032  * station is added we ignore it.
4033  */
4034 static void rs_rate_init_stub(void *mvm_r,
4035                               struct ieee80211_supported_band *sband,
4036                               struct cfg80211_chan_def *chandef,
4037                               struct ieee80211_sta *sta, void *mvm_sta)
4038 {
4039 }
4040
4041 static const struct rate_control_ops rs_mvm_ops = {
4042         .name = RS_NAME,
4043         .tx_status = rs_mac80211_tx_status,
4044         .get_rate = rs_get_rate,
4045         .rate_init = rs_rate_init_stub,
4046         .alloc = rs_alloc,
4047         .free = rs_free,
4048         .alloc_sta = rs_alloc_sta,
4049         .free_sta = rs_free_sta,
4050         .rate_update = rs_rate_update,
4051 #ifdef CONFIG_MAC80211_DEBUGFS
4052         .add_sta_debugfs = rs_add_debugfs,
4053         .remove_sta_debugfs = rs_remove_debugfs,
4054 #endif
4055 };
4056
4057 int iwl_mvm_rate_control_register(void)
4058 {
4059         return ieee80211_rate_control_register(&rs_mvm_ops);
4060 }
4061
4062 void iwl_mvm_rate_control_unregister(void)
4063 {
4064         ieee80211_rate_control_unregister(&rs_mvm_ops);
4065 }
4066
4067 /**
4068  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
4069  * Tx protection, according to this request and previous requests,
4070  * and send the LQ command.
4071  * @mvmsta: The station
4072  * @enable: Enable Tx protection?
4073  */
4074 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4075                           bool enable)
4076 {
4077         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
4078
4079         lockdep_assert_held(&mvm->mutex);
4080
4081         if (enable) {
4082                 if (mvmsta->tx_protection == 0)
4083                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
4084                 mvmsta->tx_protection++;
4085         } else {
4086                 mvmsta->tx_protection--;
4087                 if (mvmsta->tx_protection == 0)
4088                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4089         }
4090
4091         return iwl_mvm_send_lq_cmd(mvm, lq, false);
4092 }