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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
   4  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
   5  * Copyright(c) 2016 Intel Deutschland GmbH
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  * The full GNU General Public License is included in this distribution in the
  21  * file called LICENSE.
  22  *
  23  * Contact Information:
  24  *  Intel Linux Wireless <linuxwifi@intel.com>
  25  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26  *
  27  *****************************************************************************/
  28 #include <linux/kernel.h>
  29 #include <linux/skbuff.h>
  30 #include <linux/slab.h>
  31 #include <net/mac80211.h>
  32
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/delay.h>
  36
  37 #include <linux/workqueue.h>
  38 #include "rs.h"
  39 #include "fw-api.h"
  40 #include "sta.h"
  41 #include "iwl-op-mode.h"
  42 #include "mvm.h"
  43 #include "debugfs.h"
  44
  45 #define RS_NAME "iwl-mvm-rs"
  46
  47 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  48
  49 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
  50  * Use this macro when dealing with thresholds consts set as a percentage
  51  */
  52 #define RS_PERCENT(x) (128 * x)
  53
  54 static u8 rs_ht_to_legacy[] = {
  55         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  56         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  57         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  58         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  59         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  60         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  61         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  62         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  63         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  64         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  65 };
  66
  67 static const u8 ant_toggle_lookup[] = {
  68         [ANT_NONE] = ANT_NONE,
  69         [ANT_A] = ANT_B,
  70         [ANT_B] = ANT_C,
  71         [ANT_AB] = ANT_BC,
  72         [ANT_C] = ANT_A,
  73         [ANT_AC] = ANT_AB,
  74         [ANT_BC] = ANT_AC,
  75         [ANT_ABC] = ANT_ABC,
  76 };
  77
  78 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  79         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  80                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  81                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  82                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  83                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  84                                     IWL_RATE_##rp##M_INDEX,           \
  85                                     IWL_RATE_##rn##M_INDEX }
  86
  87 #define IWL_DECLARE_MCS_RATE(s)                                           \
  88         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
  89                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
  90                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
  91                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
  92                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
  93                                        IWL_RATE_INVM_INDEX,               \
  94                                        IWL_RATE_INVM_INDEX }
  95
  96 /*
  97  * Parameter order:
  98  *   rate, ht rate, prev rate, next rate
  99  *
 100  * If there isn't a valid next or previous rate then INV is used which
 101  * maps to IWL_RATE_INVALID
 102  *
 103  */
 104 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 105         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 106         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 107         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 108         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 109         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 110         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 111         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 112         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 113         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 114         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 115         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 116         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 117         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 118         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 119         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 120 };
 121
 122 enum rs_action {
 123         RS_ACTION_STAY = 0,
 124         RS_ACTION_DOWNSCALE = -1,
 125         RS_ACTION_UPSCALE = 1,
 126 };
 127
 128 enum rs_column_mode {
 129         RS_INVALID = 0,
 130         RS_LEGACY,
 131         RS_SISO,
 132         RS_MIMO2,
 133 };
 134
 135 #define MAX_NEXT_COLUMNS 7
 136 #define MAX_COLUMN_CHECKS 3
 137
 138 struct rs_tx_column;
 139
 140 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 141                                      struct ieee80211_sta *sta,
 142                                      struct rs_rate *rate,
 143                                      const struct rs_tx_column *next_col);
 144
 145 struct rs_tx_column {
 146         enum rs_column_mode mode;
 147         u8 ant;
 148         bool sgi;
 149         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 150         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 151 };
 152
 153 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 154                          struct rs_rate *rate,
 155                          const struct rs_tx_column *next_col)
 156 {
 157         return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
 158 }
 159
 160 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 161                           struct rs_rate *rate,
 162                           const struct rs_tx_column *next_col)
 163 {
 164         struct iwl_mvm_sta *mvmsta;
 165         struct iwl_mvm_vif *mvmvif;
 166
 167         if (!sta->ht_cap.ht_supported)
 168                 return false;
 169
 170         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 171                 return false;
 172
 173         if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
 174                 return false;
 175
 176         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 177                 return false;
 178
 179         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 180         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 181
 182         if (mvm->nvm_data->sku_cap_mimo_disabled)
 183                 return false;
 184
 185         return true;
 186 }
 187
 188 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 189                           struct rs_rate *rate,
 190                           const struct rs_tx_column *next_col)
 191 {
 192         if (!sta->ht_cap.ht_supported)
 193                 return false;
 194
 195         return true;
 196 }
 197
 198 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 199                          struct rs_rate *rate,
 200                          const struct rs_tx_column *next_col)
 201 {
 202         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 203         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 204
 205         if (is_ht20(rate) && (ht_cap->cap &
 206                              IEEE80211_HT_CAP_SGI_20))
 207                 return true;
 208         if (is_ht40(rate) && (ht_cap->cap &
 209                              IEEE80211_HT_CAP_SGI_40))
 210                 return true;
 211         if (is_ht80(rate) && (vht_cap->cap &
 212                              IEEE80211_VHT_CAP_SHORT_GI_80))
 213                 return true;
 214
 215         return false;
 216 }
 217
 218 static const struct rs_tx_column rs_tx_columns[] = {
 219         [RS_COLUMN_LEGACY_ANT_A] = {
 220                 .mode = RS_LEGACY,
 221                 .ant = ANT_A,
 222                 .next_columns = {
 223                         RS_COLUMN_LEGACY_ANT_B,
 224                         RS_COLUMN_SISO_ANT_A,
 225                         RS_COLUMN_MIMO2,
 226                         RS_COLUMN_INVALID,
 227                         RS_COLUMN_INVALID,
 228                         RS_COLUMN_INVALID,
 229                         RS_COLUMN_INVALID,
 230                 },
 231                 .checks = {
 232                         rs_ant_allow,
 233                 },
 234         },
 235         [RS_COLUMN_LEGACY_ANT_B] = {
 236                 .mode = RS_LEGACY,
 237                 .ant = ANT_B,
 238                 .next_columns = {
 239                         RS_COLUMN_LEGACY_ANT_A,
 240                         RS_COLUMN_SISO_ANT_B,
 241                         RS_COLUMN_MIMO2,
 242                         RS_COLUMN_INVALID,
 243                         RS_COLUMN_INVALID,
 244                         RS_COLUMN_INVALID,
 245                         RS_COLUMN_INVALID,
 246                 },
 247                 .checks = {
 248                         rs_ant_allow,
 249                 },
 250         },
 251         [RS_COLUMN_SISO_ANT_A] = {
 252                 .mode = RS_SISO,
 253                 .ant = ANT_A,
 254                 .next_columns = {
 255                         RS_COLUMN_SISO_ANT_B,
 256                         RS_COLUMN_MIMO2,
 257                         RS_COLUMN_SISO_ANT_A_SGI,
 258                         RS_COLUMN_LEGACY_ANT_A,
 259                         RS_COLUMN_LEGACY_ANT_B,
 260                         RS_COLUMN_INVALID,
 261                         RS_COLUMN_INVALID,
 262                 },
 263                 .checks = {
 264                         rs_siso_allow,
 265                         rs_ant_allow,
 266                 },
 267         },
 268         [RS_COLUMN_SISO_ANT_B] = {
 269                 .mode = RS_SISO,
 270                 .ant = ANT_B,
 271                 .next_columns = {
 272                         RS_COLUMN_SISO_ANT_A,
 273                         RS_COLUMN_MIMO2,
 274                         RS_COLUMN_SISO_ANT_B_SGI,
 275                         RS_COLUMN_LEGACY_ANT_A,
 276                         RS_COLUMN_LEGACY_ANT_B,
 277                         RS_COLUMN_INVALID,
 278                         RS_COLUMN_INVALID,
 279                 },
 280                 .checks = {
 281                         rs_siso_allow,
 282                         rs_ant_allow,
 283                 },
 284         },
 285         [RS_COLUMN_SISO_ANT_A_SGI] = {
 286                 .mode = RS_SISO,
 287                 .ant = ANT_A,
 288                 .sgi = true,
 289                 .next_columns = {
 290                         RS_COLUMN_SISO_ANT_B_SGI,
 291                         RS_COLUMN_MIMO2_SGI,
 292                         RS_COLUMN_SISO_ANT_A,
 293                         RS_COLUMN_LEGACY_ANT_A,
 294                         RS_COLUMN_LEGACY_ANT_B,
 295                         RS_COLUMN_INVALID,
 296                         RS_COLUMN_INVALID,
 297                 },
 298                 .checks = {
 299                         rs_siso_allow,
 300                         rs_ant_allow,
 301                         rs_sgi_allow,
 302                 },
 303         },
 304         [RS_COLUMN_SISO_ANT_B_SGI] = {
 305                 .mode = RS_SISO,
 306                 .ant = ANT_B,
 307                 .sgi = true,
 308                 .next_columns = {
 309                         RS_COLUMN_SISO_ANT_A_SGI,
 310                         RS_COLUMN_MIMO2_SGI,
 311                         RS_COLUMN_SISO_ANT_B,
 312                         RS_COLUMN_LEGACY_ANT_A,
 313                         RS_COLUMN_LEGACY_ANT_B,
 314                         RS_COLUMN_INVALID,
 315                         RS_COLUMN_INVALID,
 316                 },
 317                 .checks = {
 318                         rs_siso_allow,
 319                         rs_ant_allow,
 320                         rs_sgi_allow,
 321                 },
 322         },
 323         [RS_COLUMN_MIMO2] = {
 324                 .mode = RS_MIMO2,
 325                 .ant = ANT_AB,
 326                 .next_columns = {
 327                         RS_COLUMN_SISO_ANT_A,
 328                         RS_COLUMN_MIMO2_SGI,
 329                         RS_COLUMN_LEGACY_ANT_A,
 330                         RS_COLUMN_LEGACY_ANT_B,
 331                         RS_COLUMN_INVALID,
 332                         RS_COLUMN_INVALID,
 333                         RS_COLUMN_INVALID,
 334                 },
 335                 .checks = {
 336                         rs_mimo_allow,
 337                 },
 338         },
 339         [RS_COLUMN_MIMO2_SGI] = {
 340                 .mode = RS_MIMO2,
 341                 .ant = ANT_AB,
 342                 .sgi = true,
 343                 .next_columns = {
 344                         RS_COLUMN_SISO_ANT_A_SGI,
 345                         RS_COLUMN_MIMO2,
 346                         RS_COLUMN_LEGACY_ANT_A,
 347                         RS_COLUMN_LEGACY_ANT_B,
 348                         RS_COLUMN_INVALID,
 349                         RS_COLUMN_INVALID,
 350                         RS_COLUMN_INVALID,
 351                 },
 352                 .checks = {
 353                         rs_mimo_allow,
 354                         rs_sgi_allow,
 355                 },
 356         },
 357 };
 358
 359 static inline u8 rs_extract_rate(u32 rate_n_flags)
 360 {
 361         /* also works for HT because bits 7:6 are zero there */
 362         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 363 }
 364
 365 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 366 {
 367         int idx = 0;
 368
 369         if (rate_n_flags & RATE_MCS_HT_MSK) {
 370                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 371                 idx += IWL_RATE_MCS_0_INDEX;
 372
 373                 /* skip 9M not supported in HT*/
 374                 if (idx >= IWL_RATE_9M_INDEX)
 375                         idx += 1;
 376                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 377                         return idx;
 378         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 379                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 380                 idx += IWL_RATE_MCS_0_INDEX;
 381
 382                 /* skip 9M not supported in VHT*/
 383                 if (idx >= IWL_RATE_9M_INDEX)
 384                         idx++;
 385                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 386                         return idx;
 387         } else {
 388                 /* legacy rate format, search for match in table */
 389
 390                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 391                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 392                         if (iwl_rates[idx].plcp == legacy_rate)
 393                                 return idx;
 394         }
 395
 396         return IWL_RATE_INVALID;
 397 }
 398
 399 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 400                                   struct ieee80211_sta *sta,
 401                                   struct iwl_lq_sta *lq_sta,
 402                                   int tid);
 403 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 404                            struct ieee80211_sta *sta,
 405                            struct iwl_lq_sta *lq_sta,
 406                            const struct rs_rate *initial_rate);
 407 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 408
 409 /**
 410  * The following tables contain the expected throughput metrics for all rates
 411  *
 412  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 413  *
 414  * where invalid entries are zeros.
 415  *
 416  * CCK rates are only valid in legacy table and will only be used in G
 417  * (2.4 GHz) band.
 418  */
 419
 420 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 421         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 422 };
 423
 424 /* Expected TpT tables. 4 indexes:
 425  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 426  */
 427 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 428         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 429         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 430         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 431         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 432 };
 433
 434 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 435         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 436         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 437         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 438         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 439 };
 440
 441 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 442         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 443         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 444         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 445         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 446 };
 447
 448 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 449         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 450         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 451         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 452         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 453 };
 454
 455 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 456         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 457         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 458         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 459         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 460 };
 461
 462 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 463         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 464         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 465         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 466         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 467 };
 468
 469 /* mbps, mcs */
 470 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 471         {  "1", "BPSK DSSS"},
 472         {  "2", "QPSK DSSS"},
 473         {"5.5", "BPSK CCK"},
 474         { "11", "QPSK CCK"},
 475         {  "6", "BPSK 1/2"},
 476         {  "9", "BPSK 1/2"},
 477         { "12", "QPSK 1/2"},
 478         { "18", "QPSK 3/4"},
 479         { "24", "16QAM 1/2"},
 480         { "36", "16QAM 3/4"},
 481         { "48", "64QAM 2/3"},
 482         { "54", "64QAM 3/4"},
 483         { "60", "64QAM 5/6"},
 484 };
 485
 486 #define MCS_INDEX_PER_STREAM    (8)
 487
 488 static const char *rs_pretty_ant(u8 ant)
 489 {
 490         static const char * const ant_name[] = {
 491                 [ANT_NONE] = "None",
 492                 [ANT_A]    = "A",
 493                 [ANT_B]    = "B",
 494                 [ANT_AB]   = "AB",
 495                 [ANT_C]    = "C",
 496                 [ANT_AC]   = "AC",
 497                 [ANT_BC]   = "BC",
 498                 [ANT_ABC]  = "ABC",
 499         };
 500
 501         if (ant > ANT_ABC)
 502                 return "UNKNOWN";
 503
 504         return ant_name[ant];
 505 }
 506
 507 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 508 {
 509         static const char * const lq_types[] = {
 510                 [LQ_NONE] = "NONE",
 511                 [LQ_LEGACY_A] = "LEGACY_A",
 512                 [LQ_LEGACY_G] = "LEGACY_G",
 513                 [LQ_HT_SISO] = "HT SISO",
 514                 [LQ_HT_MIMO2] = "HT MIMO",
 515                 [LQ_VHT_SISO] = "VHT SISO",
 516                 [LQ_VHT_MIMO2] = "VHT MIMO",
 517         };
 518
 519         if (type < LQ_NONE || type >= LQ_MAX)
 520                 return "UNKNOWN";
 521
 522         return lq_types[type];
 523 }
 524
 525 static char *rs_pretty_rate(const struct rs_rate *rate)
 526 {
 527         static char buf[40];
 528         static const char * const legacy_rates[] = {
 529                 [IWL_RATE_1M_INDEX] = "1M",
 530                 [IWL_RATE_2M_INDEX] = "2M",
 531                 [IWL_RATE_5M_INDEX] = "5.5M",
 532                 [IWL_RATE_11M_INDEX] = "11M",
 533                 [IWL_RATE_6M_INDEX] = "6M",
 534                 [IWL_RATE_9M_INDEX] = "9M",
 535                 [IWL_RATE_12M_INDEX] = "12M",
 536                 [IWL_RATE_18M_INDEX] = "18M",
 537                 [IWL_RATE_24M_INDEX] = "24M",
 538                 [IWL_RATE_36M_INDEX] = "36M",
 539                 [IWL_RATE_48M_INDEX] = "48M",
 540                 [IWL_RATE_54M_INDEX] = "54M",
 541         };
 542         static const char *const ht_vht_rates[] = {
 543                 [IWL_RATE_MCS_0_INDEX] = "MCS0",
 544                 [IWL_RATE_MCS_1_INDEX] = "MCS1",
 545                 [IWL_RATE_MCS_2_INDEX] = "MCS2",
 546                 [IWL_RATE_MCS_3_INDEX] = "MCS3",
 547                 [IWL_RATE_MCS_4_INDEX] = "MCS4",
 548                 [IWL_RATE_MCS_5_INDEX] = "MCS5",
 549                 [IWL_RATE_MCS_6_INDEX] = "MCS6",
 550                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
 551                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
 552                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
 553         };
 554         const char *rate_str;
 555
 556         if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
 557                 rate_str = legacy_rates[rate->index];
 558         else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
 559                  (rate->index >= IWL_RATE_MCS_0_INDEX) &&
 560                  (rate->index <= IWL_RATE_MCS_9_INDEX))
 561                 rate_str = ht_vht_rates[rate->index];
 562         else
 563                 rate_str = "BAD_RATE";
 564
 565         sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
 566                 rs_pretty_ant(rate->ant), rate_str);
 567         return buf;
 568 }
 569
 570 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 571                                 const char *prefix)
 572 {
 573         IWL_DEBUG_RATE(mvm,
 574                        "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
 575                        prefix, rs_pretty_rate(rate), rate->bw,
 576                        rate->sgi, rate->ldpc, rate->stbc);
 577 }
 578
 579 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 580 {
 581         window->data = 0;
 582         window->success_counter = 0;
 583         window->success_ratio = IWL_INVALID_VALUE;
 584         window->counter = 0;
 585         window->average_tpt = IWL_INVALID_VALUE;
 586 }
 587
 588 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 589                                             struct iwl_scale_tbl_info *tbl)
 590 {
 591         int i;
 592
 593         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 594         for (i = 0; i < IWL_RATE_COUNT; i++)
 595                 rs_rate_scale_clear_window(&tbl->win[i]);
 596
 597         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 598                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 599 }
 600
 601 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 602 {
 603         return (ant_type & valid_antenna) == ant_type;
 604 }
 605
 606 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 607                                      struct iwl_lq_sta *lq_data, u8 tid,
 608                                      struct ieee80211_sta *sta)
 609 {
 610         int ret = -EAGAIN;
 611
 612         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 613                      sta->addr, tid);
 614         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 615         if (ret == -EAGAIN) {
 616                 /*
 617                  * driver and mac80211 is out of sync
 618                  * this might be cause by reloading firmware
 619                  * stop the tx ba session here
 620                  */
 621                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 622                         tid);
 623                 ieee80211_stop_tx_ba_session(sta, tid);
 624         }
 625         return ret;
 626 }
 627
 628 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 629                               struct iwl_lq_sta *lq_data,
 630                               struct ieee80211_sta *sta)
 631 {
 632         if (tid < IWL_MAX_TID_COUNT)
 633                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 634         else
 635                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 636                         tid, IWL_MAX_TID_COUNT);
 637 }
 638
 639 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 640 {
 641         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 642                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 643                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 644 }
 645
 646 /*
 647  * Static function to get the expected throughput from an iwl_scale_tbl_info
 648  * that wraps a NULL pointer check
 649  */
 650 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 651 {
 652         if (tbl->expected_tpt)
 653                 return tbl->expected_tpt[rs_index];
 654         return 0;
 655 }
 656
 657 /**
 658  * rs_collect_tx_data - Update the success/failure sliding window
 659  *
 660  * We keep a sliding window of the last 62 packets transmitted
 661  * at this rate.  window->data contains the bitmask of successful
 662  * packets.
 663  */
 664 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
 665                                struct iwl_scale_tbl_info *tbl,
 666                                int scale_index, int attempts, int successes,
 667                                struct iwl_rate_scale_data *window)
 668 {
 669         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 670         s32 fail_count, tpt;
 671
 672         /* Get expected throughput */
 673         tpt = get_expected_tpt(tbl, scale_index);
 674
 675         /*
 676          * Keep track of only the latest 62 tx frame attempts in this rate's
 677          * history window; anything older isn't really relevant any more.
 678          * If we have filled up the sliding window, drop the oldest attempt;
 679          * if the oldest attempt (highest bit in bitmap) shows "success",
 680          * subtract "1" from the success counter (this is the main reason
 681          * we keep these bitmaps!).
 682          */
 683         while (attempts > 0) {
 684                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 685                         /* remove earliest */
 686                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 687
 688                         if (window->data & mask) {
 689                                 window->data &= ~mask;
 690                                 window->success_counter--;
 691                         }
 692                 }
 693
 694                 /* Increment frames-attempted counter */
 695                 window->counter++;
 696
 697                 /* Shift bitmap by one frame to throw away oldest history */
 698                 window->data <<= 1;
 699
 700                 /* Mark the most recent #successes attempts as successful */
 701                 if (successes > 0) {
 702                         window->success_counter++;
 703                         window->data |= 0x1;
 704                         successes--;
 705                 }
 706
 707                 attempts--;
 708         }
 709
 710         /* Calculate current success ratio, avoid divide-by-0! */
 711         if (window->counter > 0)
 712                 window->success_ratio = 128 * (100 * window->success_counter)
 713                                         / window->counter;
 714         else
 715                 window->success_ratio = IWL_INVALID_VALUE;
 716
 717         fail_count = window->counter - window->success_counter;
 718
 719         /* Calculate average throughput, if we have enough history. */
 720         if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
 721             (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
 722                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 723         else
 724                 window->average_tpt = IWL_INVALID_VALUE;
 725
 726         return 0;
 727 }
 728
 729 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
 730                                struct iwl_lq_sta *lq_sta,
 731                                struct iwl_scale_tbl_info *tbl,
 732                                int scale_index, int attempts, int successes,
 733                                u8 reduced_txp)
 734 {
 735         struct iwl_rate_scale_data *window = NULL;
 736
 737         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 738                 return -EINVAL;
 739
 740         window = &tbl->tpc_win[reduced_txp];
 741         return  _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 742                                     window);
 743 }
 744
 745 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
 746                                struct iwl_lq_sta *lq_sta,
 747                                struct iwl_scale_tbl_info *tbl,
 748                                int scale_index, int attempts, int successes)
 749 {
 750         struct iwl_rate_scale_data *window = NULL;
 751
 752         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 753                 return -EINVAL;
 754
 755         if (tbl->column != RS_COLUMN_INVALID) {
 756                 struct lq_sta_pers *pers = &lq_sta->pers;
 757
 758                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 759                 pers->tx_stats[tbl->column][scale_index].success += successes;
 760         }
 761
 762         /* Select window for current tx bit rate */
 763         window = &(tbl->win[scale_index]);
 764         return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 765                                    window);
 766 }
 767
 768 /* Convert rs_rate object into ucode rate bitmask */
 769 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 770                                   struct rs_rate *rate)
 771 {
 772         u32 ucode_rate = 0;
 773         int index = rate->index;
 774
 775         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 776                          RATE_MCS_ANT_ABC_MSK);
 777
 778         if (is_legacy(rate)) {
 779                 ucode_rate |= iwl_rates[index].plcp;
 780                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 781                         ucode_rate |= RATE_MCS_CCK_MSK;
 782                 return ucode_rate;
 783         }
 784
 785         if (is_ht(rate)) {
 786                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 787                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 788                         index = IWL_LAST_HT_RATE;
 789                 }
 790                 ucode_rate |= RATE_MCS_HT_MSK;
 791
 792                 if (is_ht_siso(rate))
 793                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 794                 else if (is_ht_mimo2(rate))
 795                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 796                 else
 797                         WARN_ON_ONCE(1);
 798         } else if (is_vht(rate)) {
 799                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 800                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 801                         index = IWL_LAST_VHT_RATE;
 802                 }
 803                 ucode_rate |= RATE_MCS_VHT_MSK;
 804                 if (is_vht_siso(rate))
 805                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 806                 else if (is_vht_mimo2(rate))
 807                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 808                 else
 809                         WARN_ON_ONCE(1);
 810
 811         } else {
 812                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 813         }
 814
 815         if (is_siso(rate) && rate->stbc) {
 816                 /* To enable STBC we need to set both a flag and ANT_AB */
 817                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 818                 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
 819         }
 820
 821         ucode_rate |= rate->bw;
 822         if (rate->sgi)
 823                 ucode_rate |= RATE_MCS_SGI_MSK;
 824         if (rate->ldpc)
 825                 ucode_rate |= RATE_MCS_LDPC_MSK;
 826
 827         return ucode_rate;
 828 }
 829
 830 /* Convert a ucode rate into an rs_rate object */
 831 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 832                                    enum nl80211_band band,
 833                                    struct rs_rate *rate)
 834 {
 835         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 836         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 837         u8 nss;
 838
 839         memset(rate, 0, sizeof(*rate));
 840         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 841
 842         if (rate->index == IWL_RATE_INVALID)
 843                 return -EINVAL;
 844
 845         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 846
 847         /* Legacy */
 848         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 849             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 850                 if (num_of_ant == 1) {
 851                         if (band == NL80211_BAND_5GHZ)
 852                                 rate->type = LQ_LEGACY_A;
 853                         else
 854                                 rate->type = LQ_LEGACY_G;
 855                 }
 856
 857                 return 0;
 858         }
 859
 860         /* HT or VHT */
 861         if (ucode_rate & RATE_MCS_SGI_MSK)
 862                 rate->sgi = true;
 863         if (ucode_rate & RATE_MCS_LDPC_MSK)
 864                 rate->ldpc = true;
 865         if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
 866                 rate->stbc = true;
 867         if (ucode_rate & RATE_MCS_BF_MSK)
 868                 rate->bfer = true;
 869
 870         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 871
 872         if (ucode_rate & RATE_MCS_HT_MSK) {
 873                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 874                        RATE_HT_MCS_NSS_POS) + 1;
 875
 876                 if (nss == 1) {
 877                         rate->type = LQ_HT_SISO;
 878                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 879                                   "stbc %d bfer %d",
 880                                   rate->stbc, rate->bfer);
 881                 } else if (nss == 2) {
 882                         rate->type = LQ_HT_MIMO2;
 883                         WARN_ON_ONCE(num_of_ant != 2);
 884                 } else {
 885                         WARN_ON_ONCE(1);
 886                 }
 887         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 888                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 889                        RATE_VHT_MCS_NSS_POS) + 1;
 890
 891                 if (nss == 1) {
 892                         rate->type = LQ_VHT_SISO;
 893                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 894                                   "stbc %d bfer %d",
 895                                   rate->stbc, rate->bfer);
 896                 } else if (nss == 2) {
 897                         rate->type = LQ_VHT_MIMO2;
 898                         WARN_ON_ONCE(num_of_ant != 2);
 899                 } else {
 900                         WARN_ON_ONCE(1);
 901                 }
 902         }
 903
 904         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
 905         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 906                      !is_vht(rate));
 907
 908         return 0;
 909 }
 910
 911 /* switch to another antenna/antennas and return 1 */
 912 /* if no other valid antenna found, return 0 */
 913 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 914 {
 915         u8 new_ant_type;
 916
 917         if (!rate->ant || rate->ant > ANT_ABC)
 918                 return 0;
 919
 920         if (!rs_is_valid_ant(valid_ant, rate->ant))
 921                 return 0;
 922
 923         new_ant_type = ant_toggle_lookup[rate->ant];
 924
 925         while ((new_ant_type != rate->ant) &&
 926                !rs_is_valid_ant(valid_ant, new_ant_type))
 927                 new_ant_type = ant_toggle_lookup[new_ant_type];
 928
 929         if (new_ant_type == rate->ant)
 930                 return 0;
 931
 932         rate->ant = new_ant_type;
 933
 934         return 1;
 935 }
 936
 937 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 938                                   struct rs_rate *rate)
 939 {
 940         if (is_legacy(rate))
 941                 return lq_sta->active_legacy_rate;
 942         else if (is_siso(rate))
 943                 return lq_sta->active_siso_rate;
 944         else if (is_mimo2(rate))
 945                 return lq_sta->active_mimo2_rate;
 946
 947         WARN_ON_ONCE(1);
 948         return 0;
 949 }
 950
 951 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 952                                 int rate_type)
 953 {
 954         u8 high = IWL_RATE_INVALID;
 955         u8 low = IWL_RATE_INVALID;
 956
 957         /* 802.11A or ht walks to the next literal adjacent rate in
 958          * the rate table */
 959         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 960                 int i;
 961                 u32 mask;
 962
 963                 /* Find the previous rate that is in the rate mask */
 964                 i = index - 1;
 965                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 966                         if (rate_mask & mask) {
 967                                 low = i;
 968                                 break;
 969                         }
 970                 }
 971
 972                 /* Find the next rate that is in the rate mask */
 973                 i = index + 1;
 974                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 975                         if (rate_mask & mask) {
 976                                 high = i;
 977                                 break;
 978                         }
 979                 }
 980
 981                 return (high << 8) | low;
 982         }
 983
 984         low = index;
 985         while (low != IWL_RATE_INVALID) {
 986                 low = iwl_rates[low].prev_rs;
 987                 if (low == IWL_RATE_INVALID)
 988                         break;
 989                 if (rate_mask & (1 << low))
 990                         break;
 991         }
 992
 993         high = index;
 994         while (high != IWL_RATE_INVALID) {
 995                 high = iwl_rates[high].next_rs;
 996                 if (high == IWL_RATE_INVALID)
 997                         break;
 998                 if (rate_mask & (1 << high))
 999                         break;
1000         }
1001
1002         return (high << 8) | low;
1003 }
1004
1005 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1006                                      struct rs_rate *rate)
1007 {
1008         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1009 }
1010
1011 /* Get the next supported lower rate in the current column.
1012  * Return true if bottom rate in the current column was reached
1013  */
1014 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1015                                         struct rs_rate *rate)
1016 {
1017         u8 low;
1018         u16 high_low;
1019         u16 rate_mask;
1020         struct iwl_mvm *mvm = lq_sta->pers.drv;
1021
1022         rate_mask = rs_get_supported_rates(lq_sta, rate);
1023         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1024                                         rate->type);
1025         low = high_low & 0xff;
1026
1027         /* Bottom rate of column reached */
1028         if (low == IWL_RATE_INVALID)
1029                 return true;
1030
1031         rate->index = low;
1032         return false;
1033 }
1034
1035 /* Get the next rate to use following a column downgrade */
1036 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1037                                           struct rs_rate *rate)
1038 {
1039         struct iwl_mvm *mvm = lq_sta->pers.drv;
1040
1041         if (is_legacy(rate)) {
1042                 /* No column to downgrade from Legacy */
1043                 return;
1044         } else if (is_siso(rate)) {
1045                 /* Downgrade to Legacy if we were in SISO */
1046                 if (lq_sta->band == NL80211_BAND_5GHZ)
1047                         rate->type = LQ_LEGACY_A;
1048                 else
1049                         rate->type = LQ_LEGACY_G;
1050
1051                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1052
1053                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1054                              rate->index > IWL_RATE_MCS_9_INDEX);
1055
1056                 rate->index = rs_ht_to_legacy[rate->index];
1057                 rate->ldpc = false;
1058         } else {
1059                 /* Downgrade to SISO with same MCS if in MIMO  */
1060                 rate->type = is_vht_mimo2(rate) ?
1061                         LQ_VHT_SISO : LQ_HT_SISO;
1062         }
1063
1064         if (num_of_ant(rate->ant) > 1)
1065                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1066
1067         /* Relevant in both switching to SISO or Legacy */
1068         rate->sgi = false;
1069
1070         if (!rs_rate_supported(lq_sta, rate))
1071                 rs_get_lower_rate_in_column(lq_sta, rate);
1072 }
1073
1074 /* Check if both rates are identical
1075  * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1076  * with a rate indicating STBC/BFER and ANT_AB.
1077  */
1078 static inline bool rs_rate_equal(struct rs_rate *a,
1079                                  struct rs_rate *b,
1080                                  bool allow_ant_mismatch)
1081
1082 {
1083         bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1084                 (a->bfer == b->bfer);
1085
1086         if (allow_ant_mismatch) {
1087                 if (a->stbc || a->bfer) {
1088                         WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1089                                   a->stbc, a->bfer, a->ant);
1090                         ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1091                 } else if (b->stbc || b->bfer) {
1092                         WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1093                                   b->stbc, b->bfer, b->ant);
1094                         ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1095                 }
1096         }
1097
1098         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1099                 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1100 }
1101
1102 /* Check if both rates share the same column */
1103 static inline bool rs_rate_column_match(struct rs_rate *a,
1104                                         struct rs_rate *b)
1105 {
1106         bool ant_match;
1107
1108         if (a->stbc || a->bfer)
1109                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1110         else
1111                 ant_match = (a->ant == b->ant);
1112
1113         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1114                 && ant_match;
1115 }
1116
1117 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1118 {
1119         if (is_legacy(rate)) {
1120                 if (rate->ant == ANT_A)
1121                         return RS_COLUMN_LEGACY_ANT_A;
1122
1123                 if (rate->ant == ANT_B)
1124                         return RS_COLUMN_LEGACY_ANT_B;
1125
1126                 goto err;
1127         }
1128
1129         if (is_siso(rate)) {
1130                 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1131                         return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1132                                 RS_COLUMN_SISO_ANT_A;
1133
1134                 if (rate->ant == ANT_B)
1135                         return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1136                                 RS_COLUMN_SISO_ANT_B;
1137
1138                 goto err;
1139         }
1140
1141         if (is_mimo(rate))
1142                 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1143
1144 err:
1145         return RS_COLUMN_INVALID;
1146 }
1147
1148 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1149 {
1150         u8 tid = IWL_MAX_TID_COUNT;
1151
1152         if (ieee80211_is_data_qos(hdr->frame_control)) {
1153                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1154                 tid = qc[0] & 0xf;
1155         }
1156
1157         if (unlikely(tid > IWL_MAX_TID_COUNT))
1158                 tid = IWL_MAX_TID_COUNT;
1159
1160         return tid;
1161 }
1162
1163 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1164                           int tid, struct ieee80211_tx_info *info)
1165 {
1166         int legacy_success;
1167         int retries;
1168         int i;
1169         struct iwl_lq_cmd *table;
1170         u32 lq_hwrate;
1171         struct rs_rate lq_rate, tx_resp_rate;
1172         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1173         u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1174         u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1175         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1176         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1177         bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa,
1178                                              IWL_UCODE_TLV_API_LQ_SS_PARAMS);
1179
1180         /* Treat uninitialized rate scaling data same as non-existing. */
1181         if (!lq_sta) {
1182                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1183                 return;
1184         } else if (!lq_sta->pers.drv) {
1185                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1186                 return;
1187         }
1188
1189         /* This packet was aggregated but doesn't carry status info */
1190         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1191             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1192                 return;
1193
1194         rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1195
1196 #ifdef CONFIG_MAC80211_DEBUGFS
1197         /* Disable last tx check if we are debugging with fixed rate but
1198          * update tx stats */
1199         if (lq_sta->pers.dbg_fixed_rate) {
1200                 int index = tx_resp_rate.index;
1201                 enum rs_column column;
1202                 int attempts, success;
1203
1204                 column = rs_get_column_from_rate(&tx_resp_rate);
1205                 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1206                               "Can't map rate 0x%x to column",
1207                               tx_resp_hwrate))
1208                         return;
1209
1210                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1211                         attempts = info->status.ampdu_len;
1212                         success = info->status.ampdu_ack_len;
1213                 } else {
1214                         attempts = info->status.rates[0].count;
1215                         success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1216                 }
1217
1218                 lq_sta->pers.tx_stats[column][index].total += attempts;
1219                 lq_sta->pers.tx_stats[column][index].success += success;
1220
1221                 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1222                                tx_resp_hwrate, success, attempts);
1223                 return;
1224         }
1225 #endif
1226
1227         if (time_after(jiffies,
1228                        (unsigned long)(lq_sta->last_tx +
1229                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1230                 int t;
1231
1232                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1233                 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1234                         ieee80211_stop_tx_ba_session(sta, t);
1235
1236                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1237                 return;
1238         }
1239         lq_sta->last_tx = jiffies;
1240
1241         /* Ignore this Tx frame response if its initial rate doesn't match
1242          * that of latest Link Quality command.  There may be stragglers
1243          * from a previous Link Quality command, but we're no longer interested
1244          * in those; they're either from the "active" mode while we're trying
1245          * to check "search" mode, or a prior "search" mode after we've moved
1246          * to a new "search" mode (which might become the new "active" mode).
1247          */
1248         table = &lq_sta->lq;
1249         lq_hwrate = le32_to_cpu(table->rs_table[0]);
1250         rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1251
1252         /* Here we actually compare this rate to the latest LQ command */
1253         if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1254                 IWL_DEBUG_RATE(mvm,
1255                                "initial tx resp rate 0x%x does not match 0x%x\n",
1256                                tx_resp_hwrate, lq_hwrate);
1257
1258                 /*
1259                  * Since rates mis-match, the last LQ command may have failed.
1260                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1261                  * ... driver.
1262                  */
1263                 lq_sta->missed_rate_counter++;
1264                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1265                         lq_sta->missed_rate_counter = 0;
1266                         IWL_DEBUG_RATE(mvm,
1267                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1268                                        lq_sta->rs_state);
1269                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1270                 }
1271                 /* Regardless, ignore this status info for outdated rate */
1272                 return;
1273         } else
1274                 /* Rate did match, so reset the missed_rate_counter */
1275                 lq_sta->missed_rate_counter = 0;
1276
1277         if (!lq_sta->search_better_tbl) {
1278                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1279                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1280         } else {
1281                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1282                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1283         }
1284
1285         if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1286                 IWL_DEBUG_RATE(mvm,
1287                                "Neither active nor search matches tx rate\n");
1288                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1289                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1290                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1291                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1292                 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1293
1294                 /*
1295                  * no matching table found, let's by-pass the data collection
1296                  * and continue to perform rate scale to find the rate table
1297                  */
1298                 rs_stay_in_table(lq_sta, true);
1299                 goto done;
1300         }
1301
1302         /*
1303          * Updating the frame history depends on whether packets were
1304          * aggregated.
1305          *
1306          * For aggregation, all packets were transmitted at the same rate, the
1307          * first index into rate scale table.
1308          */
1309         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1310                 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1311                                     info->status.ampdu_len,
1312                                     info->status.ampdu_ack_len,
1313                                     reduced_txp);
1314
1315                 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1316                  * it as a single frame loss as we don't want the success ratio
1317                  * to dip too quickly because a BA wasn't received.
1318                  * For TPC, there's no need for this optimisation since we want
1319                  * to recover very quickly from a bad power reduction and,
1320                  * therefore we'd like the success ratio to get an immediate hit
1321                  * when failing to get a BA, so we'd switch back to a lower or
1322                  * zero power reduction. When FW transmits agg with a rate
1323                  * different from the initial rate, it will not use reduced txp
1324                  * and will send BA notification twice (one empty with reduced
1325                  * txp equal to the value from LQ and one with reduced txp 0).
1326                  * We need to update counters for each txp level accordingly.
1327                  */
1328                 if (info->status.ampdu_ack_len == 0)
1329                         info->status.ampdu_len = 1;
1330
1331                 rs_collect_tlc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1332                                     info->status.ampdu_len,
1333                                     info->status.ampdu_ack_len);
1334
1335                 /* Update success/fail counts if not searching for new mode */
1336                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1337                         lq_sta->total_success += info->status.ampdu_ack_len;
1338                         lq_sta->total_failed += (info->status.ampdu_len -
1339                                         info->status.ampdu_ack_len);
1340                 }
1341         } else {
1342                 /* For legacy, update frame history with for each Tx retry. */
1343                 retries = info->status.rates[0].count - 1;
1344                 /* HW doesn't send more than 15 retries */
1345                 retries = min(retries, 15);
1346
1347                 /* The last transmission may have been successful */
1348                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1349                 /* Collect data for each rate used during failed TX attempts */
1350                 for (i = 0; i <= retries; ++i) {
1351                         lq_hwrate = le32_to_cpu(table->rs_table[i]);
1352                         rs_rate_from_ucode_rate(lq_hwrate, info->band,
1353                                                 &lq_rate);
1354                         /*
1355                          * Only collect stats if retried rate is in the same RS
1356                          * table as active/search.
1357                          */
1358                         if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1359                                 tmp_tbl = curr_tbl;
1360                         else if (rs_rate_column_match(&lq_rate,
1361                                                       &other_tbl->rate))
1362                                 tmp_tbl = other_tbl;
1363                         else
1364                                 continue;
1365
1366                         rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1367                                             lq_rate.index, 1,
1368                                             i < retries ? 0 : legacy_success,
1369                                             reduced_txp);
1370                         rs_collect_tlc_data(mvm, lq_sta, tmp_tbl,
1371                                             lq_rate.index, 1,
1372                                             i < retries ? 0 : legacy_success);
1373                 }
1374
1375                 /* Update success/fail counts if not searching for new mode */
1376                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1377                         lq_sta->total_success += legacy_success;
1378                         lq_sta->total_failed += retries + (1 - legacy_success);
1379                 }
1380         }
1381         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1382         lq_sta->last_rate_n_flags = lq_hwrate;
1383         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1384 done:
1385         /* See if there's a better rate or modulation mode to try. */
1386         if (sta->supp_rates[info->band])
1387                 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1388 }
1389
1390 /*
1391  * mac80211 sends us Tx status
1392  */
1393 static void rs_mac80211_tx_status(void *mvm_r,
1394                                   struct ieee80211_supported_band *sband,
1395                                   struct ieee80211_sta *sta, void *priv_sta,
1396                                   struct sk_buff *skb)
1397 {
1398         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1399         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1400         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1401         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1402
1403         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1404                 return;
1405
1406         if (!ieee80211_is_data(hdr->frame_control) ||
1407             info->flags & IEEE80211_TX_CTL_NO_ACK)
1408                 return;
1409
1410         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1411 }
1412
1413 /*
1414  * Begin a period of staying with a selected modulation mode.
1415  * Set "stay_in_tbl" flag to prevent any mode switches.
1416  * Set frame tx success limits according to legacy vs. high-throughput,
1417  * and reset overall (spanning all rates) tx success history statistics.
1418  * These control how long we stay using same modulation mode before
1419  * searching for a new mode.
1420  */
1421 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1422                                  struct iwl_lq_sta *lq_sta)
1423 {
1424         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1425         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1426         if (is_legacy) {
1427                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1428                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1429                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1430         } else {
1431                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1432                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1433                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1434         }
1435         lq_sta->table_count = 0;
1436         lq_sta->total_failed = 0;
1437         lq_sta->total_success = 0;
1438         lq_sta->flush_timer = jiffies;
1439         lq_sta->visited_columns = 0;
1440 }
1441
1442 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1443 {
1444         if (rate_mask)
1445                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1446         return IWL_RATE_INVALID;
1447 }
1448
1449 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1450                                    const struct rs_tx_column *column)
1451 {
1452         switch (column->mode) {
1453         case RS_LEGACY:
1454                 return lq_sta->max_legacy_rate_idx;
1455         case RS_SISO:
1456                 return lq_sta->max_siso_rate_idx;
1457         case RS_MIMO2:
1458                 return lq_sta->max_mimo2_rate_idx;
1459         default:
1460                 WARN_ON_ONCE(1);
1461         }
1462
1463         return lq_sta->max_legacy_rate_idx;
1464 }
1465
1466 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1467                                             const struct rs_tx_column *column,
1468                                             u32 bw)
1469 {
1470         /* Used to choose among HT tables */
1471         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1472
1473         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1474                          column->mode != RS_SISO &&
1475                          column->mode != RS_MIMO2))
1476                 return expected_tpt_legacy;
1477
1478         /* Legacy rates have only one table */
1479         if (column->mode == RS_LEGACY)
1480                 return expected_tpt_legacy;
1481
1482         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1483         /* Choose among many HT tables depending on number of streams
1484          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1485          * status */
1486         if (column->mode == RS_SISO) {
1487                 switch (bw) {
1488                 case RATE_MCS_CHAN_WIDTH_20:
1489                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1490                         break;
1491                 case RATE_MCS_CHAN_WIDTH_40:
1492                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1493                         break;
1494                 case RATE_MCS_CHAN_WIDTH_80:
1495                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1496                         break;
1497                 default:
1498                         WARN_ON_ONCE(1);
1499                 }
1500         } else if (column->mode == RS_MIMO2) {
1501                 switch (bw) {
1502                 case RATE_MCS_CHAN_WIDTH_20:
1503                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1504                         break;
1505                 case RATE_MCS_CHAN_WIDTH_40:
1506                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1507                         break;
1508                 case RATE_MCS_CHAN_WIDTH_80:
1509                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1510                         break;
1511                 default:
1512                         WARN_ON_ONCE(1);
1513                 }
1514         } else {
1515                 WARN_ON_ONCE(1);
1516         }
1517
1518         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1519                 return ht_tbl_pointer[0];
1520         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1521                 return ht_tbl_pointer[1];
1522         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1523                 return ht_tbl_pointer[2];
1524         else                                            /* AGG+SGI */
1525                 return ht_tbl_pointer[3];
1526 }
1527
1528 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1529                                       struct iwl_scale_tbl_info *tbl)
1530 {
1531         struct rs_rate *rate = &tbl->rate;
1532         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1533
1534         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1535 }
1536
1537 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1538                             struct iwl_lq_sta *lq_sta,
1539                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1540                             unsigned long rate_mask, s8 index)
1541 {
1542         struct iwl_scale_tbl_info *active_tbl =
1543             &(lq_sta->lq_info[lq_sta->active_tbl]);
1544         s32 success_ratio = active_tbl->win[index].success_ratio;
1545         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1546         const u16 *tpt_tbl = tbl->expected_tpt;
1547         u16 high_low;
1548         u32 target_tpt;
1549         int rate_idx;
1550
1551         if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1552                 target_tpt = 100 * expected_current_tpt;
1553                 IWL_DEBUG_RATE(mvm,
1554                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1555                                success_ratio, target_tpt);
1556         } else {
1557                 target_tpt = lq_sta->last_tpt;
1558                 IWL_DEBUG_RATE(mvm,
1559                                "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1560                                success_ratio, target_tpt);
1561         }
1562
1563         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1564
1565         while (rate_idx != IWL_RATE_INVALID) {
1566                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1567                         break;
1568
1569                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1570                                                 tbl->rate.type);
1571
1572                 rate_idx = (high_low >> 8) & 0xff;
1573         }
1574
1575         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1576                        rate_idx, target_tpt,
1577                        rate_idx != IWL_RATE_INVALID ?
1578                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1579
1580         return rate_idx;
1581 }
1582
1583 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1584 {
1585         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1586                 return RATE_MCS_CHAN_WIDTH_80;
1587         else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1588                 return RATE_MCS_CHAN_WIDTH_40;
1589
1590         return RATE_MCS_CHAN_WIDTH_20;
1591 }
1592
1593 /*
1594  * Check whether we should continue using same modulation mode, or
1595  * begin search for a new mode, based on:
1596  * 1) # tx successes or failures while using this mode
1597  * 2) # times calling this function
1598  * 3) elapsed time in this mode (not used, for now)
1599  */
1600 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1601 {
1602         struct iwl_scale_tbl_info *tbl;
1603         int active_tbl;
1604         int flush_interval_passed = 0;
1605         struct iwl_mvm *mvm;
1606
1607         mvm = lq_sta->pers.drv;
1608         active_tbl = lq_sta->active_tbl;
1609
1610         tbl = &(lq_sta->lq_info[active_tbl]);
1611
1612         /* If we've been disallowing search, see if we should now allow it */
1613         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1614                 /* Elapsed time using current modulation mode */
1615                 if (lq_sta->flush_timer)
1616                         flush_interval_passed =
1617                                 time_after(jiffies,
1618                                            (unsigned long)(lq_sta->flush_timer +
1619                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1620
1621                 /*
1622                  * Check if we should allow search for new modulation mode.
1623                  * If many frames have failed or succeeded, or we've used
1624                  * this same modulation for a long time, allow search, and
1625                  * reset history stats that keep track of whether we should
1626                  * allow a new search.  Also (below) reset all bitmaps and
1627                  * stats in active history.
1628                  */
1629                 if (force_search ||
1630                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1631                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1632                     ((!lq_sta->search_better_tbl) &&
1633                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1634                         IWL_DEBUG_RATE(mvm,
1635                                        "LQ: stay is expired %d %d %d\n",
1636                                      lq_sta->total_failed,
1637                                      lq_sta->total_success,
1638                                      flush_interval_passed);
1639
1640                         /* Allow search for new mode */
1641                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1642                         IWL_DEBUG_RATE(mvm,
1643                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1644                         lq_sta->total_failed = 0;
1645                         lq_sta->total_success = 0;
1646                         lq_sta->flush_timer = 0;
1647                         /* mark the current column as visited */
1648                         lq_sta->visited_columns = BIT(tbl->column);
1649                 /*
1650                  * Else if we've used this modulation mode enough repetitions
1651                  * (regardless of elapsed time or success/failure), reset
1652                  * history bitmaps and rate-specific stats for all rates in
1653                  * active table.
1654                  */
1655                 } else {
1656                         lq_sta->table_count++;
1657                         if (lq_sta->table_count >=
1658                             lq_sta->table_count_limit) {
1659                                 lq_sta->table_count = 0;
1660
1661                                 IWL_DEBUG_RATE(mvm,
1662                                                "LQ: stay in table clear win\n");
1663                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1664                         }
1665                 }
1666
1667                 /* If transitioning to allow "search", reset all history
1668                  * bitmaps and stats in active table (this will become the new
1669                  * "search" table). */
1670                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1671                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1672                 }
1673         }
1674 }
1675
1676 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1677                              struct iwl_scale_tbl_info *tbl,
1678                              enum rs_action scale_action)
1679 {
1680         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
1681
1682         if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1683             tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1684             scale_action == RS_ACTION_DOWNSCALE)
1685                 sta_priv->tlc_amsdu = false;
1686         else
1687                 sta_priv->tlc_amsdu = true;
1688 }
1689
1690 /*
1691  * setup rate table in uCode
1692  */
1693 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1694                                struct ieee80211_sta *sta,
1695                                struct iwl_lq_sta *lq_sta,
1696                                struct iwl_scale_tbl_info *tbl)
1697 {
1698         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1699         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1700 }
1701
1702 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1703                               struct ieee80211_sta *sta,
1704                               struct iwl_lq_sta *lq_sta,
1705                               struct iwl_scale_tbl_info *tbl,
1706                               enum rs_action scale_action)
1707 {
1708         if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1709                 return false;
1710
1711         if (!is_vht_siso(&tbl->rate))
1712                 return false;
1713
1714         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1715             (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1716             (scale_action == RS_ACTION_DOWNSCALE)) {
1717                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1718                 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1719                 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1720                 goto tweaked;
1721         }
1722
1723         /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1724          * sustainable, i.e. we're past the test window. We can't go back
1725          * if MCS5 is just tested as this will happen always after switching
1726          * to 20Mhz MCS4 because the rate stats are cleared.
1727          */
1728         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1729             (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1730              (scale_action == RS_ACTION_STAY)) ||
1731              ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1732               (scale_action == RS_ACTION_UPSCALE)))) {
1733                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1734                 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1735                 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1736                 goto tweaked;
1737         }
1738
1739         return false;
1740
1741 tweaked:
1742         rs_set_expected_tpt_table(lq_sta, tbl);
1743         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1744         return true;
1745 }
1746
1747 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1748                                          struct iwl_lq_sta *lq_sta,
1749                                          struct ieee80211_sta *sta,
1750                                          struct iwl_scale_tbl_info *tbl)
1751 {
1752         int i, j, max_rate;
1753         enum rs_column next_col_id;
1754         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1755         const struct rs_tx_column *next_col;
1756         allow_column_func_t allow_func;
1757         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1758         const u16 *expected_tpt_tbl;
1759         u16 tpt, max_expected_tpt;
1760
1761         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1762                 next_col_id = curr_col->next_columns[i];
1763
1764                 if (next_col_id == RS_COLUMN_INVALID)
1765                         continue;
1766
1767                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1768                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1769                                        next_col_id);
1770                         continue;
1771                 }
1772
1773                 next_col = &rs_tx_columns[next_col_id];
1774
1775                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1776                         IWL_DEBUG_RATE(mvm,
1777                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1778                                        next_col_id, valid_ants, next_col->ant);
1779                         continue;
1780                 }
1781
1782                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1783                         allow_func = next_col->checks[j];
1784                         if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1785                                                       next_col))
1786                                 break;
1787                 }
1788
1789                 if (j != MAX_COLUMN_CHECKS) {
1790                         IWL_DEBUG_RATE(mvm,
1791                                        "Skip column %d: not allowed (check %d failed)\n",
1792                                        next_col_id, j);
1793
1794                         continue;
1795                 }
1796
1797                 tpt = lq_sta->last_tpt / 100;
1798                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1799                                                      rs_bw_from_sta_bw(sta));
1800                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1801                         continue;
1802
1803                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1804                 if (max_rate == IWL_RATE_INVALID) {
1805                         IWL_DEBUG_RATE(mvm,
1806                                        "Skip column %d: no rate is allowed in this column\n",
1807                                        next_col_id);
1808                         continue;
1809                 }
1810
1811                 max_expected_tpt = expected_tpt_tbl[max_rate];
1812                 if (tpt >= max_expected_tpt) {
1813                         IWL_DEBUG_RATE(mvm,
1814                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1815                                        next_col_id, max_expected_tpt, tpt);
1816                         continue;
1817                 }
1818
1819                 IWL_DEBUG_RATE(mvm,
1820                                "Found potential column %d. Max expected %d current %d\n",
1821                                next_col_id, max_expected_tpt, tpt);
1822                 break;
1823         }
1824
1825         if (i == MAX_NEXT_COLUMNS)
1826                 return RS_COLUMN_INVALID;
1827
1828         return next_col_id;
1829 }
1830
1831 static int rs_switch_to_column(struct iwl_mvm *mvm,
1832                                struct iwl_lq_sta *lq_sta,
1833                                struct ieee80211_sta *sta,
1834                                enum rs_column col_id)
1835 {
1836         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1837         struct iwl_scale_tbl_info *search_tbl =
1838                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1839         struct rs_rate *rate = &search_tbl->rate;
1840         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1841         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1842         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1843                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1844         unsigned long rate_mask = 0;
1845         u32 rate_idx = 0;
1846
1847         memcpy(search_tbl, tbl, sz);
1848
1849         rate->sgi = column->sgi;
1850         rate->ant = column->ant;
1851
1852         if (column->mode == RS_LEGACY) {
1853                 if (lq_sta->band == NL80211_BAND_5GHZ)
1854                         rate->type = LQ_LEGACY_A;
1855                 else
1856                         rate->type = LQ_LEGACY_G;
1857
1858                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1859                 rate->ldpc = false;
1860                 rate_mask = lq_sta->active_legacy_rate;
1861         } else if (column->mode == RS_SISO) {
1862                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1863                 rate_mask = lq_sta->active_siso_rate;
1864         } else if (column->mode == RS_MIMO2) {
1865                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1866                 rate_mask = lq_sta->active_mimo2_rate;
1867         } else {
1868                 WARN_ONCE(1, "Bad column mode");
1869         }
1870
1871         if (column->mode != RS_LEGACY) {
1872                 rate->bw = rs_bw_from_sta_bw(sta);
1873                 rate->ldpc = lq_sta->ldpc;
1874         }
1875
1876         search_tbl->column = col_id;
1877         rs_set_expected_tpt_table(lq_sta, search_tbl);
1878
1879         lq_sta->visited_columns |= BIT(col_id);
1880
1881         /* Get the best matching rate if we're changing modes. e.g.
1882          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1883          */
1884         if (curr_column->mode != column->mode) {
1885                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1886                                             rate_mask, rate->index);
1887
1888                 if ((rate_idx == IWL_RATE_INVALID) ||
1889                     !(BIT(rate_idx) & rate_mask)) {
1890                         IWL_DEBUG_RATE(mvm,
1891                                        "can not switch with index %d"
1892                                        " rate mask %lx\n",
1893                                        rate_idx, rate_mask);
1894
1895                         goto err;
1896                 }
1897
1898                 rate->index = rate_idx;
1899         }
1900
1901         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1902                        col_id, rate->index);
1903
1904         return 0;
1905
1906 err:
1907         rate->type = LQ_NONE;
1908         return -1;
1909 }
1910
1911 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1912                                          struct iwl_scale_tbl_info *tbl,
1913                                          s32 sr, int low, int high,
1914                                          int current_tpt,
1915                                          int low_tpt, int high_tpt)
1916 {
1917         enum rs_action action = RS_ACTION_STAY;
1918
1919         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1920             (current_tpt == 0)) {
1921                 IWL_DEBUG_RATE(mvm,
1922                                "Decrease rate because of low SR\n");
1923                 return RS_ACTION_DOWNSCALE;
1924         }
1925
1926         if ((low_tpt == IWL_INVALID_VALUE) &&
1927             (high_tpt == IWL_INVALID_VALUE) &&
1928             (high != IWL_RATE_INVALID)) {
1929                 IWL_DEBUG_RATE(mvm,
1930                                "No data about high/low rates. Increase rate\n");
1931                 return RS_ACTION_UPSCALE;
1932         }
1933
1934         if ((high_tpt == IWL_INVALID_VALUE) &&
1935             (high != IWL_RATE_INVALID) &&
1936             (low_tpt != IWL_INVALID_VALUE) &&
1937             (low_tpt < current_tpt)) {
1938                 IWL_DEBUG_RATE(mvm,
1939                                "No data about high rate and low rate is worse. Increase rate\n");
1940                 return RS_ACTION_UPSCALE;
1941         }
1942
1943         if ((high_tpt != IWL_INVALID_VALUE) &&
1944             (high_tpt > current_tpt)) {
1945                 IWL_DEBUG_RATE(mvm,
1946                                "Higher rate is better. Increate rate\n");
1947                 return RS_ACTION_UPSCALE;
1948         }
1949
1950         if ((low_tpt != IWL_INVALID_VALUE) &&
1951             (high_tpt != IWL_INVALID_VALUE) &&
1952             (low_tpt < current_tpt) &&
1953             (high_tpt < current_tpt)) {
1954                 IWL_DEBUG_RATE(mvm,
1955                                "Both high and low are worse. Maintain rate\n");
1956                 return RS_ACTION_STAY;
1957         }
1958
1959         if ((low_tpt != IWL_INVALID_VALUE) &&
1960             (low_tpt > current_tpt)) {
1961                 IWL_DEBUG_RATE(mvm,
1962                                "Lower rate is better\n");
1963                 action = RS_ACTION_DOWNSCALE;
1964                 goto out;
1965         }
1966
1967         if ((low_tpt == IWL_INVALID_VALUE) &&
1968             (low != IWL_RATE_INVALID)) {
1969                 IWL_DEBUG_RATE(mvm,
1970                                "No data about lower rate\n");
1971                 action = RS_ACTION_DOWNSCALE;
1972                 goto out;
1973         }
1974
1975         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1976
1977 out:
1978         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1979                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1980                         IWL_DEBUG_RATE(mvm,
1981                                        "SR is above NO DECREASE. Avoid downscale\n");
1982                         action = RS_ACTION_STAY;
1983                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1984                         IWL_DEBUG_RATE(mvm,
1985                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1986                         action = RS_ACTION_STAY;
1987                 } else {
1988                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1989                 }
1990         }
1991
1992         return action;
1993 }
1994
1995 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1996                           struct iwl_lq_sta *lq_sta)
1997 {
1998         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1999          * supports STBC of at least 1*SS
2000          */
2001         if (!lq_sta->stbc_capable)
2002                 return false;
2003
2004         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2005                 return false;
2006
2007         return true;
2008 }
2009
2010 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2011                                 int *weaker, int *stronger)
2012 {
2013         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2014         if (*weaker > TPC_MAX_REDUCTION)
2015                 *weaker = TPC_INVALID;
2016
2017         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2018         if (*stronger < 0)
2019                 *stronger = TPC_INVALID;
2020 }
2021
2022 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2023                            struct rs_rate *rate, enum nl80211_band band)
2024 {
2025         int index = rate->index;
2026         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2027         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2028                                 !vif->bss_conf.ps);
2029
2030         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2031                        cam, sta_ps_disabled);
2032         /*
2033          * allow tpc only if power management is enabled, or bt coex
2034          * activity grade allows it and we are on 2.4Ghz.
2035          */
2036         if ((cam || sta_ps_disabled) &&
2037             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2038                 return false;
2039
2040         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2041         if (is_legacy(rate))
2042                 return index == IWL_RATE_54M_INDEX;
2043         if (is_ht(rate))
2044                 return index == IWL_RATE_MCS_7_INDEX;
2045         if (is_vht(rate))
2046                 return index == IWL_RATE_MCS_7_INDEX ||
2047                        index == IWL_RATE_MCS_8_INDEX ||
2048                        index == IWL_RATE_MCS_9_INDEX;
2049
2050         WARN_ON_ONCE(1);
2051         return false;
2052 }
2053
2054 enum tpc_action {
2055         TPC_ACTION_STAY,
2056         TPC_ACTION_DECREASE,
2057         TPC_ACTION_INCREASE,
2058         TPC_ACTION_NO_RESTIRCTION,
2059 };
2060
2061 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2062                                          s32 sr, int weak, int strong,
2063                                          int current_tpt,
2064                                          int weak_tpt, int strong_tpt)
2065 {
2066         /* stay until we have valid tpt */
2067         if (current_tpt == IWL_INVALID_VALUE) {
2068                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2069                 return TPC_ACTION_STAY;
2070         }
2071
2072         /* Too many failures, increase txp */
2073         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2074             current_tpt == 0) {
2075                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2076                 return TPC_ACTION_NO_RESTIRCTION;
2077         }
2078
2079         /* try decreasing first if applicable */
2080         if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2081             weak != TPC_INVALID) {
2082                 if (weak_tpt == IWL_INVALID_VALUE &&
2083                     (strong_tpt == IWL_INVALID_VALUE ||
2084                      current_tpt >= strong_tpt)) {
2085                         IWL_DEBUG_RATE(mvm,
2086                                        "no weak txp measurement. decrease txp\n");
2087                         return TPC_ACTION_DECREASE;
2088                 }
2089
2090                 if (weak_tpt > current_tpt) {
2091                         IWL_DEBUG_RATE(mvm,
2092                                        "lower txp has better tpt. decrease txp\n");
2093                         return TPC_ACTION_DECREASE;
2094                 }
2095         }
2096
2097         /* next, increase if needed */
2098         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2099             strong != TPC_INVALID) {
2100                 if (weak_tpt == IWL_INVALID_VALUE &&
2101                     strong_tpt != IWL_INVALID_VALUE &&
2102                     current_tpt < strong_tpt) {
2103                         IWL_DEBUG_RATE(mvm,
2104                                        "higher txp has better tpt. increase txp\n");
2105                         return TPC_ACTION_INCREASE;
2106                 }
2107
2108                 if (weak_tpt < current_tpt &&
2109                     (strong_tpt == IWL_INVALID_VALUE ||
2110                      strong_tpt > current_tpt)) {
2111                         IWL_DEBUG_RATE(mvm,
2112                                        "lower txp has worse tpt. increase txp\n");
2113                         return TPC_ACTION_INCREASE;
2114                 }
2115         }
2116
2117         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2118         return TPC_ACTION_STAY;
2119 }
2120
2121 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2122                            struct ieee80211_sta *sta,
2123                            struct iwl_lq_sta *lq_sta,
2124                            struct iwl_scale_tbl_info *tbl)
2125 {
2126         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2127         struct ieee80211_vif *vif = mvm_sta->vif;
2128         struct ieee80211_chanctx_conf *chanctx_conf;
2129         enum nl80211_band band;
2130         struct iwl_rate_scale_data *window;
2131         struct rs_rate *rate = &tbl->rate;
2132         enum tpc_action action;
2133         s32 sr;
2134         u8 cur = lq_sta->lq.reduced_tpc;
2135         int current_tpt;
2136         int weak, strong;
2137         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2138
2139 #ifdef CONFIG_MAC80211_DEBUGFS
2140         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2141                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2142                                lq_sta->pers.dbg_fixed_txp_reduction);
2143                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2144                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2145         }
2146 #endif
2147
2148         rcu_read_lock();
2149         chanctx_conf = rcu_dereference(vif->chanctx_conf);
2150         if (WARN_ON(!chanctx_conf))
2151                 band = NUM_NL80211_BANDS;
2152         else
2153                 band = chanctx_conf->def.chan->band;
2154         rcu_read_unlock();
2155
2156         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2157                 IWL_DEBUG_RATE(mvm,
2158                                "tpc is not allowed. remove txp restrictions\n");
2159                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2160                 return cur != TPC_NO_REDUCTION;
2161         }
2162
2163         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2164
2165         /* Collect measured throughputs for current and adjacent rates */
2166         window = tbl->tpc_win;
2167         sr = window[cur].success_ratio;
2168         current_tpt = window[cur].average_tpt;
2169         if (weak != TPC_INVALID)
2170                 weak_tpt = window[weak].average_tpt;
2171         if (strong != TPC_INVALID)
2172                 strong_tpt = window[strong].average_tpt;
2173
2174         IWL_DEBUG_RATE(mvm,
2175                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2176                        cur, current_tpt, sr, weak, strong,
2177                        weak_tpt, strong_tpt);
2178
2179         action = rs_get_tpc_action(mvm, sr, weak, strong,
2180                                    current_tpt, weak_tpt, strong_tpt);
2181
2182         /* override actions if we are on the edge */
2183         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2184                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2185                 action = TPC_ACTION_STAY;
2186         } else if (strong == TPC_INVALID &&
2187                    (action == TPC_ACTION_INCREASE ||
2188                     action == TPC_ACTION_NO_RESTIRCTION)) {
2189                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2190                 action = TPC_ACTION_STAY;
2191         }
2192
2193         switch (action) {
2194         case TPC_ACTION_DECREASE:
2195                 lq_sta->lq.reduced_tpc = weak;
2196                 return true;
2197         case TPC_ACTION_INCREASE:
2198                 lq_sta->lq.reduced_tpc = strong;
2199                 return true;
2200         case TPC_ACTION_NO_RESTIRCTION:
2201                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2202                 return true;
2203         case TPC_ACTION_STAY:
2204                 /* do nothing */
2205                 break;
2206         }
2207         return false;
2208 }
2209
2210 /*
2211  * Do rate scaling and search for new modulation mode.
2212  */
2213 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2214                                   struct ieee80211_sta *sta,
2215                                   struct iwl_lq_sta *lq_sta,
2216                                   int tid)
2217 {
2218         int low = IWL_RATE_INVALID;
2219         int high = IWL_RATE_INVALID;
2220         int index;
2221         struct iwl_rate_scale_data *window = NULL;
2222         int current_tpt = IWL_INVALID_VALUE;
2223         int low_tpt = IWL_INVALID_VALUE;
2224         int high_tpt = IWL_INVALID_VALUE;
2225         u32 fail_count;
2226         enum rs_action scale_action = RS_ACTION_STAY;
2227         u16 rate_mask;
2228         u8 update_lq = 0;
2229         struct iwl_scale_tbl_info *tbl, *tbl1;
2230         u8 active_tbl = 0;
2231         u8 done_search = 0;
2232         u16 high_low;
2233         s32 sr;
2234         u8 prev_agg = lq_sta->is_agg;
2235         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2236         struct iwl_mvm_tid_data *tid_data;
2237         struct rs_rate *rate;
2238
2239         lq_sta->is_agg = !!sta_priv->agg_tids;
2240
2241         /*
2242          * Select rate-scale / modulation-mode table to work with in
2243          * the rest of this function:  "search" if searching for better
2244          * modulation mode, or "active" if doing rate scaling within a mode.
2245          */
2246         if (!lq_sta->search_better_tbl)
2247                 active_tbl = lq_sta->active_tbl;
2248         else
2249                 active_tbl = 1 - lq_sta->active_tbl;
2250
2251         tbl = &(lq_sta->lq_info[active_tbl]);
2252         rate = &tbl->rate;
2253
2254         if (prev_agg != lq_sta->is_agg) {
2255                 IWL_DEBUG_RATE(mvm,
2256                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2257                                prev_agg, lq_sta->is_agg);
2258                 rs_set_expected_tpt_table(lq_sta, tbl);
2259                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2260         }
2261
2262         /* current tx rate */
2263         index = rate->index;
2264
2265         /* rates available for this association, and for modulation mode */
2266         rate_mask = rs_get_supported_rates(lq_sta, rate);
2267
2268         if (!(BIT(index) & rate_mask)) {
2269                 IWL_ERR(mvm, "Current Rate is not valid\n");
2270                 if (lq_sta->search_better_tbl) {
2271                         /* revert to active table if search table is not valid*/
2272                         rate->type = LQ_NONE;
2273                         lq_sta->search_better_tbl = 0;
2274                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2275                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2276                 }
2277                 return;
2278         }
2279
2280         /* Get expected throughput table and history window for current rate */
2281         if (!tbl->expected_tpt) {
2282                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2283                 return;
2284         }
2285
2286         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2287         window = &(tbl->win[index]);
2288
2289         /*
2290          * If there is not enough history to calculate actual average
2291          * throughput, keep analyzing results of more tx frames, without
2292          * changing rate or mode (bypass most of the rest of this function).
2293          * Set up new rate table in uCode only if old rate is not supported
2294          * in current association (use new rate found above).
2295          */
2296         fail_count = window->counter - window->success_counter;
2297         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2298             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2299                 IWL_DEBUG_RATE(mvm,
2300                                "%s: Test Window: succ %d total %d\n",
2301                                rs_pretty_rate(rate),
2302                                window->success_counter, window->counter);
2303
2304                 /* Can't calculate this yet; not enough history */
2305                 window->average_tpt = IWL_INVALID_VALUE;
2306
2307                 /* Should we stay with this modulation mode,
2308                  * or search for a new one? */
2309                 rs_stay_in_table(lq_sta, false);
2310
2311                 return;
2312         }
2313
2314         /* If we are searching for better modulation mode, check success. */
2315         if (lq_sta->search_better_tbl) {
2316                 /* If good success, continue using the "search" mode;
2317                  * no need to send new link quality command, since we're
2318                  * continuing to use the setup that we've been trying. */
2319                 if (window->average_tpt > lq_sta->last_tpt) {
2320                         IWL_DEBUG_RATE(mvm,
2321                                        "SWITCHING TO NEW TABLE SR: %d "
2322                                        "cur-tpt %d old-tpt %d\n",
2323                                        window->success_ratio,
2324                                        window->average_tpt,
2325                                        lq_sta->last_tpt);
2326
2327                         /* Swap tables; "search" becomes "active" */
2328                         lq_sta->active_tbl = active_tbl;
2329                         current_tpt = window->average_tpt;
2330                 /* Else poor success; go back to mode in "active" table */
2331                 } else {
2332                         IWL_DEBUG_RATE(mvm,
2333                                        "GOING BACK TO THE OLD TABLE: SR %d "
2334                                        "cur-tpt %d old-tpt %d\n",
2335                                        window->success_ratio,
2336                                        window->average_tpt,
2337                                        lq_sta->last_tpt);
2338
2339                         /* Nullify "search" table */
2340                         rate->type = LQ_NONE;
2341
2342                         /* Revert to "active" table */
2343                         active_tbl = lq_sta->active_tbl;
2344                         tbl = &(lq_sta->lq_info[active_tbl]);
2345
2346                         /* Revert to "active" rate and throughput info */
2347                         index = tbl->rate.index;
2348                         current_tpt = lq_sta->last_tpt;
2349
2350                         /* Need to set up a new rate table in uCode */
2351                         update_lq = 1;
2352                 }
2353
2354                 /* Either way, we've made a decision; modulation mode
2355                  * search is done, allow rate adjustment next time. */
2356                 lq_sta->search_better_tbl = 0;
2357                 done_search = 1;        /* Don't switch modes below! */
2358                 goto lq_update;
2359         }
2360
2361         /* (Else) not in search of better modulation mode, try for better
2362          * starting rate, while staying in this mode. */
2363         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2364         low = high_low & 0xff;
2365         high = (high_low >> 8) & 0xff;
2366
2367         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2368
2369         sr = window->success_ratio;
2370
2371         /* Collect measured throughputs for current and adjacent rates */
2372         current_tpt = window->average_tpt;
2373         if (low != IWL_RATE_INVALID)
2374                 low_tpt = tbl->win[low].average_tpt;
2375         if (high != IWL_RATE_INVALID)
2376                 high_tpt = tbl->win[high].average_tpt;
2377
2378         IWL_DEBUG_RATE(mvm,
2379                        "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2380                        rs_pretty_rate(rate), current_tpt, sr,
2381                        low, high, low_tpt, high_tpt);
2382
2383         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2384                                           current_tpt, low_tpt, high_tpt);
2385
2386         /* Force a search in case BT doesn't like us being in MIMO */
2387         if (is_mimo(rate) &&
2388             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2389                 IWL_DEBUG_RATE(mvm,
2390                                "BT Coex forbids MIMO. Search for new config\n");
2391                 rs_stay_in_table(lq_sta, true);
2392                 goto lq_update;
2393         }
2394
2395         switch (scale_action) {
2396         case RS_ACTION_DOWNSCALE:
2397                 /* Decrease starting rate, update uCode's rate table */
2398                 if (low != IWL_RATE_INVALID) {
2399                         update_lq = 1;
2400                         index = low;
2401                 } else {
2402                         IWL_DEBUG_RATE(mvm,
2403                                        "At the bottom rate. Can't decrease\n");
2404                 }
2405
2406                 break;
2407         case RS_ACTION_UPSCALE:
2408                 /* Increase starting rate, update uCode's rate table */
2409                 if (high != IWL_RATE_INVALID) {
2410                         update_lq = 1;
2411                         index = high;
2412                 } else {
2413                         IWL_DEBUG_RATE(mvm,
2414                                        "At the top rate. Can't increase\n");
2415                 }
2416
2417                 break;
2418         case RS_ACTION_STAY:
2419                 /* No change */
2420                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2421                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2422                 break;
2423         default:
2424                 break;
2425         }
2426
2427 lq_update:
2428         /* Replace uCode's rate table for the destination station. */
2429         if (update_lq) {
2430                 tbl->rate.index = index;
2431                 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2432                         rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2433                 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2434                 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2435         }
2436
2437         rs_stay_in_table(lq_sta, false);
2438
2439         /*
2440          * Search for new modulation mode if we're:
2441          * 1)  Not changing rates right now
2442          * 2)  Not just finishing up a search
2443          * 3)  Allowing a new search
2444          */
2445         if (!update_lq && !done_search &&
2446             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2447             && window->counter) {
2448                 enum rs_column next_column;
2449
2450                 /* Save current throughput to compare with "search" throughput*/
2451                 lq_sta->last_tpt = current_tpt;
2452
2453                 IWL_DEBUG_RATE(mvm,
2454                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2455                                update_lq, done_search, lq_sta->rs_state,
2456                                window->counter);
2457
2458                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2459                 if (next_column != RS_COLUMN_INVALID) {
2460                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2461                                                       next_column);
2462                         if (!ret)
2463                                 lq_sta->search_better_tbl = 1;
2464                 } else {
2465                         IWL_DEBUG_RATE(mvm,
2466                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2467                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2468                 }
2469
2470                 /* If new "search" mode was selected, set up in uCode table */
2471                 if (lq_sta->search_better_tbl) {
2472                         /* Access the "search" table, clear its history. */
2473                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2474                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2475
2476                         /* Use new "search" start rate */
2477                         index = tbl->rate.index;
2478
2479                         rs_dump_rate(mvm, &tbl->rate,
2480                                      "Switch to SEARCH TABLE:");
2481                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2482                 } else {
2483                         done_search = 1;
2484                 }
2485         }
2486
2487         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2488                 /* If the "active" (non-search) mode was legacy,
2489                  * and we've tried switching antennas,
2490                  * but we haven't been able to try HT modes (not available),
2491                  * stay with best antenna legacy modulation for a while
2492                  * before next round of mode comparisons. */
2493                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2494                 if (is_legacy(&tbl1->rate)) {
2495                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2496
2497                         if (tid != IWL_MAX_TID_COUNT) {
2498                                 tid_data = &sta_priv->tid_data[tid];
2499                                 if (tid_data->state != IWL_AGG_OFF) {
2500                                         IWL_DEBUG_RATE(mvm,
2501                                                        "Stop aggregation on tid %d\n",
2502                                                        tid);
2503                                         ieee80211_stop_tx_ba_session(sta, tid);
2504                                 }
2505                         }
2506                         rs_set_stay_in_table(mvm, 1, lq_sta);
2507                 } else {
2508                 /* If we're in an HT mode, and all 3 mode switch actions
2509                  * have been tried and compared, stay in this best modulation
2510                  * mode for a while before next round of mode comparisons. */
2511                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2512                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2513                             (tid != IWL_MAX_TID_COUNT)) {
2514                                 tid_data = &sta_priv->tid_data[tid];
2515                                 if (tid_data->state == IWL_AGG_OFF) {
2516                                         IWL_DEBUG_RATE(mvm,
2517                                                        "try to aggregate tid %d\n",
2518                                                        tid);
2519                                         rs_tl_turn_on_agg(mvm, tid,
2520                                                           lq_sta, sta);
2521                                 }
2522                         }
2523                         rs_set_stay_in_table(mvm, 0, lq_sta);
2524                 }
2525         }
2526 }
2527
2528 struct rs_init_rate_info {
2529         s8 rssi;
2530         u8 rate_idx;
2531 };
2532
2533 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2534         { -60, IWL_RATE_54M_INDEX },
2535         { -64, IWL_RATE_48M_INDEX },
2536         { -68, IWL_RATE_36M_INDEX },
2537         { -80, IWL_RATE_24M_INDEX },
2538         { -84, IWL_RATE_18M_INDEX },
2539         { -85, IWL_RATE_12M_INDEX },
2540         { -86, IWL_RATE_11M_INDEX },
2541         { -88, IWL_RATE_5M_INDEX  },
2542         { -90, IWL_RATE_2M_INDEX  },
2543         { S8_MIN, IWL_RATE_1M_INDEX },
2544 };
2545
2546 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2547         { -60, IWL_RATE_54M_INDEX },
2548         { -64, IWL_RATE_48M_INDEX },
2549         { -72, IWL_RATE_36M_INDEX },
2550         { -80, IWL_RATE_24M_INDEX },
2551         { -84, IWL_RATE_18M_INDEX },
2552         { -85, IWL_RATE_12M_INDEX },
2553         { -87, IWL_RATE_9M_INDEX  },
2554         { S8_MIN, IWL_RATE_6M_INDEX },
2555 };
2556
2557 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2558         { -60, IWL_RATE_MCS_7_INDEX },
2559         { -64, IWL_RATE_MCS_6_INDEX },
2560         { -68, IWL_RATE_MCS_5_INDEX },
2561         { -72, IWL_RATE_MCS_4_INDEX },
2562         { -80, IWL_RATE_MCS_3_INDEX },
2563         { -84, IWL_RATE_MCS_2_INDEX },
2564         { -85, IWL_RATE_MCS_1_INDEX },
2565         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2566 };
2567
2568 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2569         { -60, IWL_RATE_MCS_8_INDEX },
2570         { -64, IWL_RATE_MCS_7_INDEX },
2571         { -68, IWL_RATE_MCS_6_INDEX },
2572         { -72, IWL_RATE_MCS_5_INDEX },
2573         { -80, IWL_RATE_MCS_4_INDEX },
2574         { -84, IWL_RATE_MCS_3_INDEX },
2575         { -85, IWL_RATE_MCS_2_INDEX },
2576         { -87, IWL_RATE_MCS_1_INDEX },
2577         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2578 };
2579
2580 static const struct rs_init_rate_info rs_optimal_rates_vht_40_80mhz[] = {
2581         { -60, IWL_RATE_MCS_9_INDEX },
2582         { -64, IWL_RATE_MCS_8_INDEX },
2583         { -68, IWL_RATE_MCS_7_INDEX },
2584         { -72, IWL_RATE_MCS_6_INDEX },
2585         { -80, IWL_RATE_MCS_5_INDEX },
2586         { -84, IWL_RATE_MCS_4_INDEX },
2587         { -85, IWL_RATE_MCS_3_INDEX },
2588         { -87, IWL_RATE_MCS_2_INDEX },
2589         { -88, IWL_RATE_MCS_1_INDEX },
2590         { S8_MIN, IWL_RATE_MCS_0_INDEX },
2591 };
2592
2593 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2594
2595 /* Init the optimal rate based on STA caps
2596  * This combined with rssi is used to report the last tx rate
2597  * to userspace when we haven't transmitted enough frames.
2598  */
2599 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2600                                  struct ieee80211_sta *sta,
2601                                  struct iwl_lq_sta *lq_sta)
2602 {
2603         struct rs_rate *rate = &lq_sta->optimal_rate;
2604
2605         if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2606                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2607         else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2608                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2609         else if (lq_sta->band == NL80211_BAND_5GHZ)
2610                 rate->type = LQ_LEGACY_A;
2611         else
2612                 rate->type = LQ_LEGACY_G;
2613
2614         rate->bw = rs_bw_from_sta_bw(sta);
2615         rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2616
2617         /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2618
2619         if (is_mimo(rate)) {
2620                 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2621         } else if (is_siso(rate)) {
2622                 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2623         } else {
2624                 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2625
2626                 if (lq_sta->band == NL80211_BAND_5GHZ) {
2627                         lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2628                         lq_sta->optimal_nentries =
2629                                 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2630                 } else {
2631                         lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2632                         lq_sta->optimal_nentries =
2633                                 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2634                 }
2635         }
2636
2637         if (is_vht(rate)) {
2638                 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2639                         lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2640                         lq_sta->optimal_nentries =
2641                                 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2642                 } else {
2643                         lq_sta->optimal_rates = rs_optimal_rates_vht_40_80mhz;
2644                         lq_sta->optimal_nentries =
2645                                 ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz);
2646                 }
2647         } else if (is_ht(rate)) {
2648                 lq_sta->optimal_rates = rs_optimal_rates_ht;
2649                 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2650         }
2651 }
2652
2653 /* Compute the optimal rate index based on RSSI */
2654 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2655                                            struct iwl_lq_sta *lq_sta)
2656 {
2657         struct rs_rate *rate = &lq_sta->optimal_rate;
2658         int i;
2659
2660         rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2661                                      BITS_PER_LONG);
2662
2663         for (i = 0; i < lq_sta->optimal_nentries; i++) {
2664                 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2665
2666                 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2667                     (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2668                         rate->index = rate_idx;
2669                         break;
2670                 }
2671         }
2672
2673         return rate;
2674 }
2675
2676 /* Choose an initial legacy rate and antenna to use based on the RSSI
2677  * of last Rx
2678  */
2679 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2680                                 struct ieee80211_sta *sta,
2681                                 struct iwl_lq_sta *lq_sta,
2682                                 enum nl80211_band band,
2683                                 struct rs_rate *rate)
2684 {
2685         int i, nentries;
2686         unsigned long active_rate;
2687         s8 best_rssi = S8_MIN;
2688         u8 best_ant = ANT_NONE;
2689         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2690         const struct rs_init_rate_info *initial_rates;
2691
2692         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2693                 if (!(lq_sta->pers.chains & BIT(i)))
2694                         continue;
2695
2696                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2697                         best_rssi = lq_sta->pers.chain_signal[i];
2698                         best_ant = BIT(i);
2699                 }
2700         }
2701
2702         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2703                        rs_pretty_ant(best_ant), best_rssi);
2704
2705         if (best_ant != ANT_A && best_ant != ANT_B)
2706                 rate->ant = first_antenna(valid_tx_ant);
2707         else
2708                 rate->ant = best_ant;
2709
2710         rate->sgi = false;
2711         rate->ldpc = false;
2712         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2713
2714         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2715                                      BITS_PER_LONG);
2716
2717         if (band == NL80211_BAND_5GHZ) {
2718                 rate->type = LQ_LEGACY_A;
2719                 initial_rates = rs_optimal_rates_5ghz_legacy;
2720                 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2721         } else {
2722                 rate->type = LQ_LEGACY_G;
2723                 initial_rates = rs_optimal_rates_24ghz_legacy;
2724                 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2725         }
2726
2727         if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2728                 goto out;
2729
2730         /* Start from a higher rate if the corresponding debug capability
2731          * is enabled. The rate is chosen according to AP capabilities.
2732          * In case of VHT/HT when the rssi is low fallback to the case of
2733          * legacy rates.
2734          */
2735         if (sta->vht_cap.vht_supported &&
2736             best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2737                 if (sta->bandwidth >= IEEE80211_STA_RX_BW_40) {
2738                         initial_rates = rs_optimal_rates_vht_40_80mhz;
2739                         nentries = ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz);
2740                         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
2741                                 rate->bw = RATE_MCS_CHAN_WIDTH_80;
2742                         else
2743                                 rate->bw = RATE_MCS_CHAN_WIDTH_40;
2744                 } else if (sta->bandwidth == IEEE80211_STA_RX_BW_20) {
2745                         initial_rates = rs_optimal_rates_vht_20mhz;
2746                         nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2747                         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2748                 } else {
2749                         IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2750                         goto out;
2751                 }
2752                 active_rate = lq_sta->active_siso_rate;
2753                 rate->type = LQ_VHT_SISO;
2754         } else if (sta->ht_cap.ht_supported &&
2755                    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2756                 initial_rates = rs_optimal_rates_ht;
2757                 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2758                 active_rate = lq_sta->active_siso_rate;
2759                 rate->type = LQ_HT_SISO;
2760         } else {
2761                 active_rate = lq_sta->active_legacy_rate;
2762         }
2763
2764         for (i = 0; i < nentries; i++) {
2765                 int rate_idx = initial_rates[i].rate_idx;
2766
2767                 if ((best_rssi >= initial_rates[i].rssi) &&
2768                     (BIT(rate_idx) & active_rate)) {
2769                         rate->index = rate_idx;
2770                         break;
2771                 }
2772         }
2773
2774 out:
2775         rs_dump_rate(mvm, rate, "INITIAL");
2776 }
2777
2778 /* Save info about RSSI of last Rx */
2779 void rs_update_last_rssi(struct iwl_mvm *mvm,
2780                          struct iwl_lq_sta *lq_sta,
2781                          struct ieee80211_rx_status *rx_status)
2782 {
2783         int i;
2784
2785         lq_sta->pers.chains = rx_status->chains;
2786         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2787         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2788         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2789         lq_sta->pers.last_rssi = S8_MIN;
2790
2791         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2792                 if (!(lq_sta->pers.chains & BIT(i)))
2793                         continue;
2794
2795                 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2796                         lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2797         }
2798 }
2799
2800 /**
2801  * rs_initialize_lq - Initialize a station's hardware rate table
2802  *
2803  * The uCode's station table contains a table of fallback rates
2804  * for automatic fallback during transmission.
2805  *
2806  * NOTE: This sets up a default set of values.  These will be replaced later
2807  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2808  *       rc80211_simple.
2809  *
2810  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2811  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2812  *       which requires station table entry to exist).
2813  */
2814 static void rs_initialize_lq(struct iwl_mvm *mvm,
2815                              struct ieee80211_sta *sta,
2816                              struct iwl_lq_sta *lq_sta,
2817                              enum nl80211_band band,
2818                              bool init)
2819 {
2820         struct iwl_scale_tbl_info *tbl;
2821         struct rs_rate *rate;
2822         u8 active_tbl = 0;
2823
2824         if (!sta || !lq_sta)
2825                 return;
2826
2827         if (!lq_sta->search_better_tbl)
2828                 active_tbl = lq_sta->active_tbl;
2829         else
2830                 active_tbl = 1 - lq_sta->active_tbl;
2831
2832         tbl = &(lq_sta->lq_info[active_tbl]);
2833         rate = &tbl->rate;
2834
2835         rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2836         rs_init_optimal_rate(mvm, sta, lq_sta);
2837
2838         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2839         tbl->column = rs_get_column_from_rate(rate);
2840
2841         rs_set_expected_tpt_table(lq_sta, tbl);
2842         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2843         /* TODO restore station should remember the lq cmd */
2844         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2845 }
2846
2847 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2848                         struct ieee80211_tx_rate_control *txrc)
2849 {
2850         struct sk_buff *skb = txrc->skb;
2851         struct iwl_op_mode *op_mode __maybe_unused =
2852                         (struct iwl_op_mode *)mvm_r;
2853         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2854         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2855         struct iwl_lq_sta *lq_sta = mvm_sta;
2856         struct rs_rate *optimal_rate;
2857         u32 last_ucode_rate;
2858
2859         if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2860                 /* if vif isn't initialized mvm doesn't know about
2861                  * this station, so don't do anything with the it
2862                  */
2863                 sta = NULL;
2864                 mvm_sta = NULL;
2865         }
2866
2867         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2868
2869         /* Treat uninitialized rate scaling data same as non-existing. */
2870         if (lq_sta && !lq_sta->pers.drv) {
2871                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2872                 mvm_sta = NULL;
2873         }
2874
2875         /* Send management frames and NO_ACK data using lowest rate. */
2876         if (rate_control_send_low(sta, mvm_sta, txrc))
2877                 return;
2878
2879         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2880                                   info->band, &info->control.rates[0]);
2881         info->control.rates[0].count = 1;
2882
2883         /* Report the optimal rate based on rssi and STA caps if we haven't
2884          * converged yet (too little traffic) or exploring other modulations
2885          */
2886         if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2887                 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2888                 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2889                                                           optimal_rate);
2890                 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2891                                           &txrc->reported_rate);
2892         }
2893 }
2894
2895 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2896                           gfp_t gfp)
2897 {
2898         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2899         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2900         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2901         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2902
2903         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2904
2905         lq_sta->pers.drv = mvm;
2906 #ifdef CONFIG_MAC80211_DEBUGFS
2907         lq_sta->pers.dbg_fixed_rate = 0;
2908         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2909         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2910 #endif
2911         lq_sta->pers.chains = 0;
2912         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2913         lq_sta->pers.last_rssi = S8_MIN;
2914
2915         return &sta_priv->lq_sta;
2916 }
2917
2918 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2919                                        int nss)
2920 {
2921         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2922                 (0x3 << (2 * (nss - 1)));
2923         rx_mcs >>= (2 * (nss - 1));
2924
2925         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2926                 return IWL_RATE_MCS_7_INDEX;
2927         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2928                 return IWL_RATE_MCS_8_INDEX;
2929         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2930                 return IWL_RATE_MCS_9_INDEX;
2931
2932         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2933         return -1;
2934 }
2935
2936 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2937                                      struct ieee80211_sta_vht_cap *vht_cap,
2938                                      struct iwl_lq_sta *lq_sta)
2939 {
2940         int i;
2941         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2942
2943         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2944                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2945                         if (i == IWL_RATE_9M_INDEX)
2946                                 continue;
2947
2948                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2949                         if (i == IWL_RATE_MCS_9_INDEX &&
2950                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2951                                 continue;
2952
2953                         lq_sta->active_siso_rate |= BIT(i);
2954                 }
2955         }
2956
2957         if (sta->rx_nss < 2)
2958                 return;
2959
2960         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2961         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2962                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2963                         if (i == IWL_RATE_9M_INDEX)
2964                                 continue;
2965
2966                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2967                         if (i == IWL_RATE_MCS_9_INDEX &&
2968                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2969                                 continue;
2970
2971                         lq_sta->active_mimo2_rate |= BIT(i);
2972                 }
2973         }
2974 }
2975
2976 static void rs_ht_init(struct iwl_mvm *mvm,
2977                        struct ieee80211_sta *sta,
2978                        struct iwl_lq_sta *lq_sta,
2979                        struct ieee80211_sta_ht_cap *ht_cap)
2980 {
2981         /* active_siso_rate mask includes 9 MBits (bit 5),
2982          * and CCK (bits 0-3), supp_rates[] does not;
2983          * shift to convert format, force 9 MBits off.
2984          */
2985         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2986         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2987         lq_sta->active_siso_rate &= ~((u16)0x2);
2988         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2989
2990         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2991         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2992         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2993         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2994
2995         if (mvm->cfg->ht_params->ldpc &&
2996             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2997                 lq_sta->ldpc = true;
2998
2999         if (mvm->cfg->ht_params->stbc &&
3000             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3001             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3002                 lq_sta->stbc_capable = true;
3003
3004         lq_sta->is_vht = false;
3005 }
3006
3007 static void rs_vht_init(struct iwl_mvm *mvm,
3008                         struct ieee80211_sta *sta,
3009                         struct iwl_lq_sta *lq_sta,
3010                         struct ieee80211_sta_vht_cap *vht_cap)
3011 {
3012         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
3013
3014         if (mvm->cfg->ht_params->ldpc &&
3015             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3016                 lq_sta->ldpc = true;
3017
3018         if (mvm->cfg->ht_params->stbc &&
3019             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3020             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3021                 lq_sta->stbc_capable = true;
3022
3023         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3024             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3025             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3026                 lq_sta->bfer_capable = true;
3027
3028         lq_sta->is_vht = true;
3029 }
3030
3031 #ifdef CONFIG_IWLWIFI_DEBUGFS
3032 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3033 {
3034         spin_lock_bh(&mvm->drv_stats_lock);
3035         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3036         spin_unlock_bh(&mvm->drv_stats_lock);
3037 }
3038
3039 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3040 {
3041         u8 nss = 0, mcs = 0;
3042
3043         spin_lock(&mvm->drv_stats_lock);
3044
3045         if (agg)
3046                 mvm->drv_rx_stats.agg_frames++;
3047
3048         mvm->drv_rx_stats.success_frames++;
3049
3050         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3051         case RATE_MCS_CHAN_WIDTH_20:
3052                 mvm->drv_rx_stats.bw_20_frames++;
3053                 break;
3054         case RATE_MCS_CHAN_WIDTH_40:
3055                 mvm->drv_rx_stats.bw_40_frames++;
3056                 break;
3057         case RATE_MCS_CHAN_WIDTH_80:
3058                 mvm->drv_rx_stats.bw_80_frames++;
3059                 break;
3060         default:
3061                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3062         }
3063
3064         if (rate & RATE_MCS_HT_MSK) {
3065                 mvm->drv_rx_stats.ht_frames++;
3066                 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
3067                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3068         } else if (rate & RATE_MCS_VHT_MSK) {
3069                 mvm->drv_rx_stats.vht_frames++;
3070                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3071                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3072                        RATE_VHT_MCS_NSS_POS) + 1;
3073         } else {
3074                 mvm->drv_rx_stats.legacy_frames++;
3075         }
3076
3077         if (nss == 1)
3078                 mvm->drv_rx_stats.siso_frames++;
3079         else if (nss == 2)
3080                 mvm->drv_rx_stats.mimo2_frames++;
3081
3082         if (rate & RATE_MCS_SGI_MSK)
3083                 mvm->drv_rx_stats.sgi_frames++;
3084         else
3085                 mvm->drv_rx_stats.ngi_frames++;
3086
3087         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3088         mvm->drv_rx_stats.last_frame_idx =
3089                 (mvm->drv_rx_stats.last_frame_idx + 1) %
3090                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3091
3092         spin_unlock(&mvm->drv_stats_lock);
3093 }
3094 #endif
3095
3096 /*
3097  * Called after adding a new station to initialize rate scaling
3098  */
3099 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3100                           enum nl80211_band band, bool init)
3101 {
3102         int i, j;
3103         struct ieee80211_hw *hw = mvm->hw;
3104         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3105         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3106         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
3107         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
3108         struct ieee80211_supported_band *sband;
3109         unsigned long supp; /* must be unsigned long for for_each_set_bit */
3110
3111         /* clear all non-persistent lq data */
3112         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3113
3114         sband = hw->wiphy->bands[band];
3115
3116         lq_sta->lq.sta_id = sta_priv->sta_id;
3117         sta_priv->tlc_amsdu = false;
3118
3119         for (j = 0; j < LQ_SIZE; j++)
3120                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3121
3122         lq_sta->flush_timer = 0;
3123         lq_sta->last_tx = jiffies;
3124
3125         IWL_DEBUG_RATE(mvm,
3126                        "LQ: *** rate scale station global init for station %d ***\n",
3127                        sta_priv->sta_id);
3128         /* TODO: what is a good starting rate for STA? About middle? Maybe not
3129          * the lowest or the highest rate.. Could consider using RSSI from
3130          * previous packets? Need to have IEEE 802.1X auth succeed immediately
3131          * after assoc.. */
3132
3133         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3134         lq_sta->band = sband->band;
3135         /*
3136          * active legacy rates as per supported rates bitmap
3137          */
3138         supp = sta->supp_rates[sband->band];
3139         lq_sta->active_legacy_rate = 0;
3140         for_each_set_bit(i, &supp, BITS_PER_LONG)
3141                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3142
3143         /* TODO: should probably account for rx_highest for both HT/VHT */
3144         if (!vht_cap || !vht_cap->vht_supported)
3145                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3146         else
3147                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3148
3149         lq_sta->max_legacy_rate_idx =
3150                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3151         lq_sta->max_siso_rate_idx =
3152                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3153         lq_sta->max_mimo2_rate_idx =
3154                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3155
3156         IWL_DEBUG_RATE(mvm,
3157                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3158                        lq_sta->active_legacy_rate,
3159                        lq_sta->active_siso_rate,
3160                        lq_sta->active_mimo2_rate,
3161                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3162                        lq_sta->bfer_capable);
3163         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3164                        lq_sta->max_legacy_rate_idx,
3165                        lq_sta->max_siso_rate_idx,
3166                        lq_sta->max_mimo2_rate_idx);
3167
3168         /* These values will be overridden later */
3169         lq_sta->lq.single_stream_ant_msk =
3170                 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3171         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3172
3173         /* as default allow aggregation for all tids */
3174         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3175         lq_sta->is_agg = 0;
3176 #ifdef CONFIG_IWLWIFI_DEBUGFS
3177         iwl_mvm_reset_frame_stats(mvm);
3178 #endif
3179         rs_initialize_lq(mvm, sta, lq_sta, band, init);
3180 }
3181
3182 static void rs_rate_update(void *mvm_r,
3183                            struct ieee80211_supported_band *sband,
3184                            struct cfg80211_chan_def *chandef,
3185                            struct ieee80211_sta *sta, void *priv_sta,
3186                            u32 changed)
3187 {
3188         u8 tid;
3189         struct iwl_op_mode *op_mode  =
3190                         (struct iwl_op_mode *)mvm_r;
3191         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3192
3193         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3194                 return;
3195
3196         /* Stop any ongoing aggregations as rs starts off assuming no agg */
3197         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3198                 ieee80211_stop_tx_ba_session(sta, tid);
3199
3200         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3201 }
3202
3203 #ifdef CONFIG_MAC80211_DEBUGFS
3204 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3205                                             struct iwl_lq_cmd *lq_cmd,
3206                                             enum nl80211_band band,
3207                                             u32 ucode_rate)
3208 {
3209         struct rs_rate rate;
3210         int i;
3211         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3212         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3213         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3214
3215         for (i = 0; i < num_rates; i++)
3216                 lq_cmd->rs_table[i] = ucode_rate_le32;
3217
3218         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
3219
3220         if (is_mimo(&rate))
3221                 lq_cmd->mimo_delim = num_rates - 1;
3222         else
3223                 lq_cmd->mimo_delim = 0;
3224
3225         lq_cmd->reduced_tpc = 0;
3226
3227         if (num_of_ant(ant) == 1)
3228                 lq_cmd->single_stream_ant_msk = ant;
3229
3230         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3231 }
3232 #endif /* CONFIG_MAC80211_DEBUGFS */
3233
3234 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3235                                      struct iwl_lq_sta *lq_sta,
3236                                      struct rs_rate *rate,
3237                                      __le32 *rs_table, int *rs_table_index,
3238                                      int num_rates, int num_retries,
3239                                      u8 valid_tx_ant, bool toggle_ant)
3240 {
3241         int i, j;
3242         __le32 ucode_rate;
3243         bool bottom_reached = false;
3244         int prev_rate_idx = rate->index;
3245         int end = LINK_QUAL_MAX_RETRY_NUM;
3246         int index = *rs_table_index;
3247
3248         for (i = 0; i < num_rates && index < end; i++) {
3249                 for (j = 0; j < num_retries && index < end; j++, index++) {
3250                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3251                                                                          rate));
3252                         rs_table[index] = ucode_rate;
3253                         if (toggle_ant)
3254                                 rs_toggle_antenna(valid_tx_ant, rate);
3255                 }
3256
3257                 prev_rate_idx = rate->index;
3258                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3259                 if (bottom_reached && !is_legacy(rate))
3260                         break;
3261         }
3262
3263         if (!bottom_reached && !is_legacy(rate))
3264                 rate->index = prev_rate_idx;
3265
3266         *rs_table_index = index;
3267 }
3268
3269 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3270  * column the rate table should look like this:
3271  *
3272  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3273  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3274  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3275  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3276  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3277  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3278  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3279  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3280  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3281  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3282  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3283  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3284  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3285  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3286  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3287  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3288  */
3289 static void rs_build_rates_table(struct iwl_mvm *mvm,
3290                                  struct ieee80211_sta *sta,
3291                                  struct iwl_lq_sta *lq_sta,
3292                                  const struct rs_rate *initial_rate)
3293 {
3294         struct rs_rate rate;
3295         int num_rates, num_retries, index = 0;
3296         u8 valid_tx_ant = 0;
3297         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3298         bool toggle_ant = false;
3299
3300         memcpy(&rate, initial_rate, sizeof(rate));
3301
3302         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3303
3304         /* TODO: remove old API when min FW API hits 14 */
3305         if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3306             rs_stbc_allow(mvm, sta, lq_sta))
3307                 rate.stbc = true;
3308
3309         if (is_siso(&rate)) {
3310                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3311                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3312         } else if (is_mimo(&rate)) {
3313                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3314                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3315         } else {
3316                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3317                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3318                 toggle_ant = true;
3319         }
3320
3321         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3322                                  num_rates, num_retries, valid_tx_ant,
3323                                  toggle_ant);
3324
3325         rs_get_lower_rate_down_column(lq_sta, &rate);
3326
3327         if (is_siso(&rate)) {
3328                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3329                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3330                 lq_cmd->mimo_delim = index;
3331         } else if (is_legacy(&rate)) {
3332                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3333                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3334         } else {
3335                 WARN_ON_ONCE(1);
3336         }
3337
3338         toggle_ant = true;
3339
3340         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3341                                  num_rates, num_retries, valid_tx_ant,
3342                                  toggle_ant);
3343
3344         rs_get_lower_rate_down_column(lq_sta, &rate);
3345
3346         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3347         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3348
3349         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3350                                  num_rates, num_retries, valid_tx_ant,
3351                                  toggle_ant);
3352
3353 }
3354
3355 struct rs_bfer_active_iter_data {
3356         struct ieee80211_sta *exclude_sta;
3357         struct iwl_mvm_sta *bfer_mvmsta;
3358 };
3359
3360 static void rs_bfer_active_iter(void *_data,
3361                                 struct ieee80211_sta *sta)
3362 {
3363         struct rs_bfer_active_iter_data *data = _data;
3364         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3365         struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3366         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3367
3368         if (sta == data->exclude_sta)
3369                 return;
3370
3371         /* The current sta has BFER allowed */
3372         if (ss_params & LQ_SS_BFER_ALLOWED) {
3373                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3374
3375                 data->bfer_mvmsta = mvmsta;
3376         }
3377 }
3378
3379 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3380 {
3381         int prio = -1;
3382         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3383
3384         switch (viftype) {
3385         case NL80211_IFTYPE_AP:
3386         case NL80211_IFTYPE_P2P_GO:
3387                 prio = 3;
3388                 break;
3389         case NL80211_IFTYPE_P2P_CLIENT:
3390                 prio = 2;
3391                 break;
3392         case NL80211_IFTYPE_STATION:
3393                 prio = 1;
3394                 break;
3395         default:
3396                 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3397                 prio = -1;
3398         }
3399
3400         return prio;
3401 }
3402
3403 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3404 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3405                                 struct iwl_mvm_sta *sta2)
3406 {
3407         int prio1 = rs_bfer_priority(sta1);
3408         int prio2 = rs_bfer_priority(sta2);
3409
3410         if (prio1 > prio2)
3411                 return 1;
3412         if (prio1 < prio2)
3413                 return -1;
3414         return 0;
3415 }
3416
3417 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3418                                 struct ieee80211_sta *sta,
3419                                 struct iwl_lq_sta *lq_sta,
3420                                 const struct rs_rate *initial_rate)
3421 {
3422         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3423         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3424         struct rs_bfer_active_iter_data data = {
3425                 .exclude_sta = sta,
3426                 .bfer_mvmsta = NULL,
3427         };
3428         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3429         u32 ss_params = LQ_SS_PARAMS_VALID;
3430
3431         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3432                 goto out;
3433
3434 #ifdef CONFIG_MAC80211_DEBUGFS
3435         /* Check if forcing the decision is configured.
3436          * Note that SISO is forced by not allowing STBC or BFER
3437          */
3438         if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3439                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3440         else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3441                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3442
3443         if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3444                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3445                                lq_sta->pers.ss_force);
3446                 goto out;
3447         }
3448 #endif
3449
3450         if (lq_sta->stbc_capable)
3451                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3452
3453         if (!lq_sta->bfer_capable)
3454                 goto out;
3455
3456         ieee80211_iterate_stations_atomic(mvm->hw,
3457                                           rs_bfer_active_iter,
3458                                           &data);
3459         bfer_mvmsta = data.bfer_mvmsta;
3460
3461         /* This code is safe as it doesn't run concurrently for different
3462          * stations. This is guaranteed by the fact that calls to
3463          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3464          */
3465         if (!bfer_mvmsta) {
3466                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3467
3468                 ss_params |= LQ_SS_BFER_ALLOWED;
3469                 goto out;
3470         }
3471
3472         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3473                        bfer_mvmsta->sta_id);
3474
3475         /* Disallow BFER on another STA if active and we're a higher priority */
3476         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3477                 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3478                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3479
3480                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3481                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3482                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3483
3484                 ss_params |= LQ_SS_BFER_ALLOWED;
3485                 IWL_DEBUG_RATE(mvm,
3486                                "Lower priority BFER sta found (%d). Switch BFER\n",
3487                                bfer_mvmsta->sta_id);
3488         }
3489 out:
3490         lq_cmd->ss_params = cpu_to_le32(ss_params);
3491 }
3492
3493 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3494                            struct ieee80211_sta *sta,
3495                            struct iwl_lq_sta *lq_sta,
3496                            const struct rs_rate *initial_rate)
3497 {
3498         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3499         struct iwl_mvm_sta *mvmsta;
3500         struct iwl_mvm_vif *mvmvif;
3501
3502         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3503         lq_cmd->agg_time_limit =
3504                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3505
3506 #ifdef CONFIG_MAC80211_DEBUGFS
3507         if (lq_sta->pers.dbg_fixed_rate) {
3508                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3509                                                 lq_sta->band,
3510                                                 lq_sta->pers.dbg_fixed_rate);
3511                 return;
3512         }
3513 #endif
3514         if (WARN_ON_ONCE(!sta || !initial_rate))
3515                 return;
3516
3517         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3518
3519         if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3520                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3521
3522         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3523         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3524
3525         if (num_of_ant(initial_rate->ant) == 1)
3526                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3527
3528         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3529
3530         /*
3531          * In case of low latency, tell the firmware to leave a frame in the
3532          * Tx Fifo so that it can start a transaction in the same TxOP. This
3533          * basically allows the firmware to send bursts.
3534          */
3535         if (iwl_mvm_vif_low_latency(mvmvif))
3536                 lq_cmd->agg_frame_cnt_limit--;
3537
3538         if (mvmsta->vif->p2p)
3539                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3540
3541         lq_cmd->agg_time_limit =
3542                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3543 }
3544
3545 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3546 {
3547         return hw->priv;
3548 }
3549 /* rate scale requires free function to be implemented */
3550 static void rs_free(void *mvm_rate)
3551 {
3552         return;
3553 }
3554
3555 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3556                         void *mvm_sta)
3557 {
3558         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3559         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3560
3561         IWL_DEBUG_RATE(mvm, "enter\n");
3562         IWL_DEBUG_RATE(mvm, "leave\n");
3563 }
3564
3565 #ifdef CONFIG_MAC80211_DEBUGFS
3566 int rs_pretty_print_rate(char *buf, const u32 rate)
3567 {
3568
3569         char *type, *bw;
3570         u8 mcs = 0, nss = 0;
3571         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3572
3573         if (!(rate & RATE_MCS_HT_MSK) &&
3574             !(rate & RATE_MCS_VHT_MSK)) {
3575                 int index = iwl_hwrate_to_plcp_idx(rate);
3576
3577                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3578                                rs_pretty_ant(ant),
3579                                index == IWL_RATE_INVALID ? "BAD" :
3580                                iwl_rate_mcs[index].mbps);
3581         }
3582
3583         if (rate & RATE_MCS_VHT_MSK) {
3584                 type = "VHT";
3585                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3586                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3587                        >> RATE_VHT_MCS_NSS_POS) + 1;
3588         } else if (rate & RATE_MCS_HT_MSK) {
3589                 type = "HT";
3590                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3591         } else {
3592                 type = "Unknown"; /* shouldn't happen */
3593         }
3594
3595         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3596         case RATE_MCS_CHAN_WIDTH_20:
3597                 bw = "20Mhz";
3598                 break;
3599         case RATE_MCS_CHAN_WIDTH_40:
3600                 bw = "40Mhz";
3601                 break;
3602         case RATE_MCS_CHAN_WIDTH_80:
3603                 bw = "80Mhz";
3604                 break;
3605         case RATE_MCS_CHAN_WIDTH_160:
3606                 bw = "160Mhz";
3607                 break;
3608         default:
3609                 bw = "BAD BW";
3610         }
3611
3612         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3613                        type, rs_pretty_ant(ant), bw, mcs, nss,
3614                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3615                        (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3616                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3617                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3618                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3619 }
3620
3621 /**
3622  * Program the device to use fixed rate for frame transmit
3623  * This is for debugging/testing only
3624  * once the device start use fixed rate, we need to reload the module
3625  * to being back the normal operation.
3626  */
3627 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3628                                 struct iwl_lq_sta *lq_sta)
3629 {
3630         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3631         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3632         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3633
3634         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3635                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3636
3637         if (lq_sta->pers.dbg_fixed_rate) {
3638                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3639                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3640         }
3641 }
3642
3643 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3644                         const char __user *user_buf, size_t count, loff_t *ppos)
3645 {
3646         struct iwl_lq_sta *lq_sta = file->private_data;
3647         struct iwl_mvm *mvm;
3648         char buf[64];
3649         size_t buf_size;
3650         u32 parsed_rate;
3651
3652         mvm = lq_sta->pers.drv;
3653         memset(buf, 0, sizeof(buf));
3654         buf_size = min(count, sizeof(buf) -  1);
3655         if (copy_from_user(buf, user_buf, buf_size))
3656                 return -EFAULT;
3657
3658         if (sscanf(buf, "%x", &parsed_rate) == 1)
3659                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3660         else
3661                 lq_sta->pers.dbg_fixed_rate = 0;
3662
3663         rs_program_fix_rate(mvm, lq_sta);
3664
3665         return count;
3666 }
3667
3668 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3669                         char __user *user_buf, size_t count, loff_t *ppos)
3670 {
3671         char *buff;
3672         int desc = 0;
3673         int i = 0;
3674         ssize_t ret;
3675
3676         struct iwl_lq_sta *lq_sta = file->private_data;
3677         struct iwl_mvm_sta *mvmsta =
3678                 container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3679         struct iwl_mvm *mvm;
3680         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3681         struct rs_rate *rate = &tbl->rate;
3682         u32 ss_params;
3683
3684         mvm = lq_sta->pers.drv;
3685         buff = kmalloc(2048, GFP_KERNEL);
3686         if (!buff)
3687                 return -ENOMEM;
3688
3689         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3690         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3691                         lq_sta->total_failed, lq_sta->total_success,
3692                         lq_sta->active_legacy_rate);
3693         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3694                         lq_sta->pers.dbg_fixed_rate);
3695         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3696             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3697             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3698             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3699         desc += sprintf(buff+desc, "lq type %s\n",
3700                         (is_legacy(rate)) ? "legacy" :
3701                         is_vht(rate) ? "VHT" : "HT");
3702         if (!is_legacy(rate)) {
3703                 desc += sprintf(buff + desc, " %s",
3704                    (is_siso(rate)) ? "SISO" : "MIMO2");
3705                 desc += sprintf(buff + desc, " %s",
3706                                 (is_ht20(rate)) ? "20MHz" :
3707                                 (is_ht40(rate)) ? "40MHz" :
3708                                 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3709                 desc += sprintf(buff + desc, " %s %s %s %s\n",
3710                                 (rate->sgi) ? "SGI" : "NGI",
3711                                 (rate->ldpc) ? "LDPC" : "BCC",
3712                                 (lq_sta->is_agg) ? "AGG on" : "",
3713                                 (mvmsta->tlc_amsdu) ? "AMSDU on" : "");
3714         }
3715         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3716                         lq_sta->last_rate_n_flags);
3717         desc += sprintf(buff+desc,
3718                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3719                         lq_sta->lq.flags,
3720                         lq_sta->lq.mimo_delim,
3721                         lq_sta->lq.single_stream_ant_msk,
3722                         lq_sta->lq.dual_stream_ant_msk);
3723
3724         desc += sprintf(buff+desc,
3725                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3726                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3727                         lq_sta->lq.agg_disable_start_th,
3728                         lq_sta->lq.agg_frame_cnt_limit);
3729
3730         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3731         ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3732         desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3733                         (ss_params & LQ_SS_PARAMS_VALID) ?
3734                         "VALID" : "INVALID",
3735                         (ss_params & LQ_SS_BFER_ALLOWED) ?
3736                         ", BFER" : "",
3737                         (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3738                         ", STBC" : "",
3739                         (ss_params & LQ_SS_FORCE) ?
3740                         ", FORCE" : "");
3741         desc += sprintf(buff+desc,
3742                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3743                         lq_sta->lq.initial_rate_index[0],
3744                         lq_sta->lq.initial_rate_index[1],
3745                         lq_sta->lq.initial_rate_index[2],
3746                         lq_sta->lq.initial_rate_index[3]);
3747
3748         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3749                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3750
3751                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3752                 desc += rs_pretty_print_rate(buff+desc, r);
3753         }
3754
3755         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3756         kfree(buff);
3757         return ret;
3758 }
3759
3760 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3761         .write = rs_sta_dbgfs_scale_table_write,
3762         .read = rs_sta_dbgfs_scale_table_read,
3763         .open = simple_open,
3764         .llseek = default_llseek,
3765 };
3766 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3767                         char __user *user_buf, size_t count, loff_t *ppos)
3768 {
3769         char *buff;
3770         int desc = 0;
3771         int i, j;
3772         ssize_t ret;
3773         struct iwl_scale_tbl_info *tbl;
3774         struct rs_rate *rate;
3775         struct iwl_lq_sta *lq_sta = file->private_data;
3776
3777         buff = kmalloc(1024, GFP_KERNEL);
3778         if (!buff)
3779                 return -ENOMEM;
3780
3781         for (i = 0; i < LQ_SIZE; i++) {
3782                 tbl = &(lq_sta->lq_info[i]);
3783                 rate = &tbl->rate;
3784                 desc += sprintf(buff+desc,
3785                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3786                                 "index=%d\n",
3787                                 lq_sta->active_tbl == i ? "*" : "x",
3788                                 rate->type,
3789                                 rate->sgi,
3790                                 is_ht20(rate) ? "20Mhz" :
3791                                 is_ht40(rate) ? "40Mhz" :
3792                                 is_ht80(rate) ? "80Mhz" : "ERR",
3793                                 rate->index);
3794                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3795                         desc += sprintf(buff+desc,
3796                                 "counter=%d success=%d %%=%d\n",
3797                                 tbl->win[j].counter,
3798                                 tbl->win[j].success_counter,
3799                                 tbl->win[j].success_ratio);
3800                 }
3801         }
3802         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3803         kfree(buff);
3804         return ret;
3805 }
3806
3807 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3808         .read = rs_sta_dbgfs_stats_table_read,
3809         .open = simple_open,
3810         .llseek = default_llseek,
3811 };
3812
3813 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3814                                               char __user *user_buf,
3815                                               size_t count, loff_t *ppos)
3816 {
3817         static const char * const column_name[] = {
3818                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3819                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3820                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3821                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3822                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3823                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3824                 [RS_COLUMN_MIMO2] = "MIMO2",
3825                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3826         };
3827
3828         static const char * const rate_name[] = {
3829                 [IWL_RATE_1M_INDEX] = "1M",
3830                 [IWL_RATE_2M_INDEX] = "2M",
3831                 [IWL_RATE_5M_INDEX] = "5.5M",
3832                 [IWL_RATE_11M_INDEX] = "11M",
3833                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3834                 [IWL_RATE_9M_INDEX] = "9M",
3835                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3836                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3837                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3838                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3839                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3840                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3841                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3842                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3843                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3844         };
3845
3846         char *buff, *pos, *endpos;
3847         int col, rate;
3848         ssize_t ret;
3849         struct iwl_lq_sta *lq_sta = file->private_data;
3850         struct rs_rate_stats *stats;
3851         static const size_t bufsz = 1024;
3852
3853         buff = kmalloc(bufsz, GFP_KERNEL);
3854         if (!buff)
3855                 return -ENOMEM;
3856
3857         pos = buff;
3858         endpos = pos + bufsz;
3859
3860         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3861         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3862                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3863         pos += scnprintf(pos, endpos - pos, "\n");
3864
3865         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3866                 pos += scnprintf(pos, endpos - pos,
3867                                  "%s,", column_name[col]);
3868
3869                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3870                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3871                         pos += scnprintf(pos, endpos - pos,
3872                                          "%llu/%llu,",
3873                                          stats->success,
3874                                          stats->total);
3875                 }
3876                 pos += scnprintf(pos, endpos - pos, "\n");
3877         }
3878
3879         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3880         kfree(buff);
3881         return ret;
3882 }
3883
3884 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3885                                                const char __user *user_buf,
3886                                                size_t count, loff_t *ppos)
3887 {
3888         struct iwl_lq_sta *lq_sta = file->private_data;
3889         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3890
3891         return count;
3892 }
3893
3894 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3895         .read = rs_sta_dbgfs_drv_tx_stats_read,
3896         .write = rs_sta_dbgfs_drv_tx_stats_write,
3897         .open = simple_open,
3898         .llseek = default_llseek,
3899 };
3900
3901 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3902                                        char __user *user_buf,
3903                                        size_t count, loff_t *ppos)
3904 {
3905         struct iwl_lq_sta *lq_sta = file->private_data;
3906         char buf[12];
3907         int bufsz = sizeof(buf);
3908         int pos = 0;
3909         static const char * const ss_force_name[] = {
3910                 [RS_SS_FORCE_NONE] = "none",
3911                 [RS_SS_FORCE_STBC] = "stbc",
3912                 [RS_SS_FORCE_BFER] = "bfer",
3913                 [RS_SS_FORCE_SISO] = "siso",
3914         };
3915
3916         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3917                          ss_force_name[lq_sta->pers.ss_force]);
3918         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3919 }
3920
3921 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3922                                         size_t count, loff_t *ppos)
3923 {
3924         struct iwl_mvm *mvm = lq_sta->pers.drv;
3925         int ret = 0;
3926
3927         if (!strncmp("none", buf, 4)) {
3928                 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3929         } else if (!strncmp("siso", buf, 4)) {
3930                 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3931         } else if (!strncmp("stbc", buf, 4)) {
3932                 if (lq_sta->stbc_capable) {
3933                         lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3934                 } else {
3935                         IWL_ERR(mvm,
3936                                 "can't force STBC. peer doesn't support\n");
3937                         ret = -EINVAL;
3938                 }
3939         } else if (!strncmp("bfer", buf, 4)) {
3940                 if (lq_sta->bfer_capable) {
3941                         lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3942                 } else {
3943                         IWL_ERR(mvm,
3944                                 "can't force BFER. peer doesn't support\n");
3945                         ret = -EINVAL;
3946                 }
3947         } else {
3948                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3949                 ret = -EINVAL;
3950         }
3951         return ret ?: count;
3952 }
3953
3954 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3955         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3956 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
3957                 if (!debugfs_create_file(#name, mode, parent, lq_sta,   \
3958                                          &iwl_dbgfs_##name##_ops))      \
3959                         goto err;                                       \
3960         } while (0)
3961
3962 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3963
3964 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
3965 {
3966         struct iwl_lq_sta *lq_sta = priv_sta;
3967         struct iwl_mvm_sta *mvmsta;
3968
3969         mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3970
3971         if (!mvmsta->vif)
3972                 return;
3973
3974         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3975                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
3976         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3977                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
3978         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3979                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3980         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3981                           &lq_sta->tx_agg_tid_en);
3982         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3983                           &lq_sta->pers.dbg_fixed_txp_reduction);
3984
3985         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3986         return;
3987 err:
3988         IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3989 }
3990
3991 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3992 {
3993 }
3994 #endif
3995
3996 /*
3997  * Initialization of rate scaling information is done by driver after
3998  * the station is added. Since mac80211 calls this function before a
3999  * station is added we ignore it.
4000  */
4001 static void rs_rate_init_stub(void *mvm_r,
4002                               struct ieee80211_supported_band *sband,
4003                               struct cfg80211_chan_def *chandef,
4004                               struct ieee80211_sta *sta, void *mvm_sta)
4005 {
4006 }
4007
4008 static const struct rate_control_ops rs_mvm_ops = {
4009         .name = RS_NAME,
4010         .tx_status = rs_mac80211_tx_status,
4011         .get_rate = rs_get_rate,
4012         .rate_init = rs_rate_init_stub,
4013         .alloc = rs_alloc,
4014         .free = rs_free,
4015         .alloc_sta = rs_alloc_sta,
4016         .free_sta = rs_free_sta,
4017         .rate_update = rs_rate_update,
4018 #ifdef CONFIG_MAC80211_DEBUGFS
4019         .add_sta_debugfs = rs_add_debugfs,
4020         .remove_sta_debugfs = rs_remove_debugfs,
4021 #endif
4022 };
4023
4024 int iwl_mvm_rate_control_register(void)
4025 {
4026         return ieee80211_rate_control_register(&rs_mvm_ops);
4027 }
4028
4029 void iwl_mvm_rate_control_unregister(void)
4030 {
4031         ieee80211_rate_control_unregister(&rs_mvm_ops);
4032 }
4033
4034 /**
4035  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
4036  * Tx protection, according to this request and previous requests,
4037  * and send the LQ command.
4038  * @mvmsta: The station
4039  * @enable: Enable Tx protection?
4040  */
4041 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4042                           bool enable)
4043 {
4044         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
4045
4046         lockdep_assert_held(&mvm->mutex);
4047
4048         if (enable) {
4049                 if (mvmsta->tx_protection == 0)
4050                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
4051                 mvmsta->tx_protection++;
4052         } else {
4053                 mvmsta->tx_protection--;
4054                 if (mvmsta->tx_protection == 0)
4055                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4056         }
4057
4058         return iwl_mvm_send_lq_cmd(mvm, lq, false);
4059 }