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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
   4  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of version 2 of the GNU General Public License as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  18  *
  19  * The full GNU General Public License is included in this distribution in the
  20  * file called LICENSE.
  21  *
  22  * Contact Information:
  23  *  Intel Linux Wireless <ilw@linux.intel.com>
  24  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  25  *
  26  *****************************************************************************/
  27 #include <linux/kernel.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/slab.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37 #include "rs.h"
  38 #include "fw-api.h"
  39 #include "sta.h"
  40 #include "iwl-op-mode.h"
  41 #include "mvm.h"
  42 #include "debugfs.h"
  43
  44 #define RS_NAME "iwl-mvm-rs"
  45
  46 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  47
  48 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
  49  * Use this macro when dealing with thresholds consts set as a percentage
  50  */
  51 #define RS_PERCENT(x) (128 * x)
  52
  53 static u8 rs_ht_to_legacy[] = {
  54         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  55         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  56         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  57         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  58         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  59         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  60         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  61         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  62         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  63         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  64 };
  65
  66 static const u8 ant_toggle_lookup[] = {
  67         [ANT_NONE] = ANT_NONE,
  68         [ANT_A] = ANT_B,
  69         [ANT_B] = ANT_C,
  70         [ANT_AB] = ANT_BC,
  71         [ANT_C] = ANT_A,
  72         [ANT_AC] = ANT_AB,
  73         [ANT_BC] = ANT_AC,
  74         [ANT_ABC] = ANT_ABC,
  75 };
  76
  77 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  78         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  79                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  80                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  81                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  82                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  83                                     IWL_RATE_##rp##M_INDEX,           \
  84                                     IWL_RATE_##rn##M_INDEX }
  85
  86 #define IWL_DECLARE_MCS_RATE(s)                                           \
  87         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
  88                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
  89                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
  90                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
  91                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
  92                                        IWL_RATE_INVM_INDEX,               \
  93                                        IWL_RATE_INVM_INDEX }
  94
  95 /*
  96  * Parameter order:
  97  *   rate, ht rate, prev rate, next rate
  98  *
  99  * If there isn't a valid next or previous rate then INV is used which
 100  * maps to IWL_RATE_INVALID
 101  *
 102  */
 103 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 104         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 105         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 106         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 107         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 108         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 109         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 110         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 111         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 112         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 113         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 114         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 115         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 116         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 117         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 118         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 119 };
 120
 121 enum rs_action {
 122         RS_ACTION_STAY = 0,
 123         RS_ACTION_DOWNSCALE = -1,
 124         RS_ACTION_UPSCALE = 1,
 125 };
 126
 127 enum rs_column_mode {
 128         RS_INVALID = 0,
 129         RS_LEGACY,
 130         RS_SISO,
 131         RS_MIMO2,
 132 };
 133
 134 #define MAX_NEXT_COLUMNS 7
 135 #define MAX_COLUMN_CHECKS 3
 136
 137 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 138                                      struct ieee80211_sta *sta,
 139                                      struct iwl_scale_tbl_info *tbl);
 140
 141 struct rs_tx_column {
 142         enum rs_column_mode mode;
 143         u8 ant;
 144         bool sgi;
 145         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 146         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 147 };
 148
 149 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 150                          struct iwl_scale_tbl_info *tbl)
 151 {
 152         return iwl_mvm_bt_coex_is_ant_avail(mvm, tbl->rate.ant);
 153 }
 154
 155 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 156                           struct iwl_scale_tbl_info *tbl)
 157 {
 158         if (!sta->ht_cap.ht_supported)
 159                 return false;
 160
 161         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 162                 return false;
 163
 164         if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
 165                 return false;
 166
 167         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 168                 return false;
 169
 170         return true;
 171 }
 172
 173 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 174                           struct iwl_scale_tbl_info *tbl)
 175 {
 176         if (!sta->ht_cap.ht_supported)
 177                 return false;
 178
 179         return true;
 180 }
 181
 182 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 183                          struct iwl_scale_tbl_info *tbl)
 184 {
 185         struct rs_rate *rate = &tbl->rate;
 186         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 187         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 188
 189         if (is_ht20(rate) && (ht_cap->cap &
 190                              IEEE80211_HT_CAP_SGI_20))
 191                 return true;
 192         if (is_ht40(rate) && (ht_cap->cap &
 193                              IEEE80211_HT_CAP_SGI_40))
 194                 return true;
 195         if (is_ht80(rate) && (vht_cap->cap &
 196                              IEEE80211_VHT_CAP_SHORT_GI_80))
 197                 return true;
 198
 199         return false;
 200 }
 201
 202 static const struct rs_tx_column rs_tx_columns[] = {
 203         [RS_COLUMN_LEGACY_ANT_A] = {
 204                 .mode = RS_LEGACY,
 205                 .ant = ANT_A,
 206                 .next_columns = {
 207                         RS_COLUMN_LEGACY_ANT_B,
 208                         RS_COLUMN_SISO_ANT_A,
 209                         RS_COLUMN_MIMO2,
 210                         RS_COLUMN_INVALID,
 211                         RS_COLUMN_INVALID,
 212                         RS_COLUMN_INVALID,
 213                         RS_COLUMN_INVALID,
 214                 },
 215                 .checks = {
 216                         rs_ant_allow,
 217                 },
 218         },
 219         [RS_COLUMN_LEGACY_ANT_B] = {
 220                 .mode = RS_LEGACY,
 221                 .ant = ANT_B,
 222                 .next_columns = {
 223                         RS_COLUMN_LEGACY_ANT_A,
 224                         RS_COLUMN_SISO_ANT_B,
 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_SISO_ANT_A] = {
 236                 .mode = RS_SISO,
 237                 .ant = ANT_A,
 238                 .next_columns = {
 239                         RS_COLUMN_SISO_ANT_B,
 240                         RS_COLUMN_MIMO2,
 241                         RS_COLUMN_SISO_ANT_A_SGI,
 242                         RS_COLUMN_LEGACY_ANT_A,
 243                         RS_COLUMN_LEGACY_ANT_B,
 244                         RS_COLUMN_INVALID,
 245                         RS_COLUMN_INVALID,
 246                 },
 247                 .checks = {
 248                         rs_siso_allow,
 249                         rs_ant_allow,
 250                 },
 251         },
 252         [RS_COLUMN_SISO_ANT_B] = {
 253                 .mode = RS_SISO,
 254                 .ant = ANT_B,
 255                 .next_columns = {
 256                         RS_COLUMN_SISO_ANT_A,
 257                         RS_COLUMN_MIMO2,
 258                         RS_COLUMN_SISO_ANT_B_SGI,
 259                         RS_COLUMN_LEGACY_ANT_A,
 260                         RS_COLUMN_LEGACY_ANT_B,
 261                         RS_COLUMN_INVALID,
 262                         RS_COLUMN_INVALID,
 263                 },
 264                 .checks = {
 265                         rs_siso_allow,
 266                         rs_ant_allow,
 267                 },
 268         },
 269         [RS_COLUMN_SISO_ANT_A_SGI] = {
 270                 .mode = RS_SISO,
 271                 .ant = ANT_A,
 272                 .sgi = true,
 273                 .next_columns = {
 274                         RS_COLUMN_SISO_ANT_B_SGI,
 275                         RS_COLUMN_MIMO2_SGI,
 276                         RS_COLUMN_SISO_ANT_A,
 277                         RS_COLUMN_LEGACY_ANT_A,
 278                         RS_COLUMN_LEGACY_ANT_B,
 279                         RS_COLUMN_INVALID,
 280                         RS_COLUMN_INVALID,
 281                 },
 282                 .checks = {
 283                         rs_siso_allow,
 284                         rs_ant_allow,
 285                         rs_sgi_allow,
 286                 },
 287         },
 288         [RS_COLUMN_SISO_ANT_B_SGI] = {
 289                 .mode = RS_SISO,
 290                 .ant = ANT_B,
 291                 .sgi = true,
 292                 .next_columns = {
 293                         RS_COLUMN_SISO_ANT_A_SGI,
 294                         RS_COLUMN_MIMO2_SGI,
 295                         RS_COLUMN_SISO_ANT_B,
 296                         RS_COLUMN_LEGACY_ANT_A,
 297                         RS_COLUMN_LEGACY_ANT_B,
 298                         RS_COLUMN_INVALID,
 299                         RS_COLUMN_INVALID,
 300                 },
 301                 .checks = {
 302                         rs_siso_allow,
 303                         rs_ant_allow,
 304                         rs_sgi_allow,
 305                 },
 306         },
 307         [RS_COLUMN_MIMO2] = {
 308                 .mode = RS_MIMO2,
 309                 .ant = ANT_AB,
 310                 .next_columns = {
 311                         RS_COLUMN_SISO_ANT_A,
 312                         RS_COLUMN_MIMO2_SGI,
 313                         RS_COLUMN_LEGACY_ANT_A,
 314                         RS_COLUMN_LEGACY_ANT_B,
 315                         RS_COLUMN_INVALID,
 316                         RS_COLUMN_INVALID,
 317                         RS_COLUMN_INVALID,
 318                 },
 319                 .checks = {
 320                         rs_mimo_allow,
 321                 },
 322         },
 323         [RS_COLUMN_MIMO2_SGI] = {
 324                 .mode = RS_MIMO2,
 325                 .ant = ANT_AB,
 326                 .sgi = true,
 327                 .next_columns = {
 328                         RS_COLUMN_SISO_ANT_A_SGI,
 329                         RS_COLUMN_MIMO2,
 330                         RS_COLUMN_LEGACY_ANT_A,
 331                         RS_COLUMN_LEGACY_ANT_B,
 332                         RS_COLUMN_INVALID,
 333                         RS_COLUMN_INVALID,
 334                         RS_COLUMN_INVALID,
 335                 },
 336                 .checks = {
 337                         rs_mimo_allow,
 338                         rs_sgi_allow,
 339                 },
 340         },
 341 };
 342
 343 static inline u8 rs_extract_rate(u32 rate_n_flags)
 344 {
 345         /* also works for HT because bits 7:6 are zero there */
 346         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 347 }
 348
 349 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 350 {
 351         int idx = 0;
 352
 353         if (rate_n_flags & RATE_MCS_HT_MSK) {
 354                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 355                 idx += IWL_RATE_MCS_0_INDEX;
 356
 357                 /* skip 9M not supported in HT*/
 358                 if (idx >= IWL_RATE_9M_INDEX)
 359                         idx += 1;
 360                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 361                         return idx;
 362         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 363                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 364                 idx += IWL_RATE_MCS_0_INDEX;
 365
 366                 /* skip 9M not supported in VHT*/
 367                 if (idx >= IWL_RATE_9M_INDEX)
 368                         idx++;
 369                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 370                         return idx;
 371         } else {
 372                 /* legacy rate format, search for match in table */
 373
 374                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 375                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 376                         if (iwl_rates[idx].plcp == legacy_rate)
 377                                 return idx;
 378         }
 379
 380         return IWL_RATE_INVALID;
 381 }
 382
 383 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 384                                   struct ieee80211_sta *sta,
 385                                   struct iwl_lq_sta *lq_sta,
 386                                   int tid);
 387 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 388                            struct ieee80211_sta *sta,
 389                            struct iwl_lq_sta *lq_sta,
 390                            const struct rs_rate *initial_rate);
 391 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 392
 393 /**
 394  * The following tables contain the expected throughput metrics for all rates
 395  *
 396  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 397  *
 398  * where invalid entries are zeros.
 399  *
 400  * CCK rates are only valid in legacy table and will only be used in G
 401  * (2.4 GHz) band.
 402  */
 403
 404 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 405         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 406 };
 407
 408 /* Expected TpT tables. 4 indexes:
 409  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 410  */
 411 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 412         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 413         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 414         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 415         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 416 };
 417
 418 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 419         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 420         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 421         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 422         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 423 };
 424
 425 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 426         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 427         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 428         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 429         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 430 };
 431
 432 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 433         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 434         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 435         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 436         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 437 };
 438
 439 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 440         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 441         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 442         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 443         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 444 };
 445
 446 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 447         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 448         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 449         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 450         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 451 };
 452
 453 /* mbps, mcs */
 454 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 455         {  "1", "BPSK DSSS"},
 456         {  "2", "QPSK DSSS"},
 457         {"5.5", "BPSK CCK"},
 458         { "11", "QPSK CCK"},
 459         {  "6", "BPSK 1/2"},
 460         {  "9", "BPSK 1/2"},
 461         { "12", "QPSK 1/2"},
 462         { "18", "QPSK 3/4"},
 463         { "24", "16QAM 1/2"},
 464         { "36", "16QAM 3/4"},
 465         { "48", "64QAM 2/3"},
 466         { "54", "64QAM 3/4"},
 467         { "60", "64QAM 5/6"},
 468 };
 469
 470 #define MCS_INDEX_PER_STREAM    (8)
 471
 472 static const char *rs_pretty_ant(u8 ant)
 473 {
 474         static const char * const ant_name[] = {
 475                 [ANT_NONE] = "None",
 476                 [ANT_A]    = "A",
 477                 [ANT_B]    = "B",
 478                 [ANT_AB]   = "AB",
 479                 [ANT_C]    = "C",
 480                 [ANT_AC]   = "AC",
 481                 [ANT_BC]   = "BC",
 482                 [ANT_ABC]  = "ABC",
 483         };
 484
 485         if (ant > ANT_ABC)
 486                 return "UNKNOWN";
 487
 488         return ant_name[ant];
 489 }
 490
 491 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 492 {
 493         static const char * const lq_types[] = {
 494                 [LQ_NONE] = "NONE",
 495                 [LQ_LEGACY_A] = "LEGACY_A",
 496                 [LQ_LEGACY_G] = "LEGACY_G",
 497                 [LQ_HT_SISO] = "HT SISO",
 498                 [LQ_HT_MIMO2] = "HT MIMO",
 499                 [LQ_VHT_SISO] = "VHT SISO",
 500                 [LQ_VHT_MIMO2] = "VHT MIMO",
 501         };
 502
 503         if (type < LQ_NONE || type >= LQ_MAX)
 504                 return "UNKNOWN";
 505
 506         return lq_types[type];
 507 }
 508
 509 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 510                                 const char *prefix)
 511 {
 512         IWL_DEBUG_RATE(mvm,
 513                        "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
 514                        prefix, rs_pretty_lq_type(rate->type),
 515                        rate->index, rs_pretty_ant(rate->ant),
 516                        rate->bw, rate->sgi, rate->ldpc, rate->stbc);
 517 }
 518
 519 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 520 {
 521         window->data = 0;
 522         window->success_counter = 0;
 523         window->success_ratio = IWL_INVALID_VALUE;
 524         window->counter = 0;
 525         window->average_tpt = IWL_INVALID_VALUE;
 526 }
 527
 528 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 529                                             struct iwl_scale_tbl_info *tbl)
 530 {
 531         int i;
 532
 533         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 534         for (i = 0; i < IWL_RATE_COUNT; i++)
 535                 rs_rate_scale_clear_window(&tbl->win[i]);
 536
 537         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 538                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 539 }
 540
 541 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 542 {
 543         return (ant_type & valid_antenna) == ant_type;
 544 }
 545
 546 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 547                                       struct iwl_lq_sta *lq_data, u8 tid,
 548                                       struct ieee80211_sta *sta)
 549 {
 550         int ret = -EAGAIN;
 551
 552         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 553                      sta->addr, tid);
 554         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 555         if (ret == -EAGAIN) {
 556                 /*
 557                  * driver and mac80211 is out of sync
 558                  * this might be cause by reloading firmware
 559                  * stop the tx ba session here
 560                  */
 561                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 562                         tid);
 563                 ieee80211_stop_tx_ba_session(sta, tid);
 564         }
 565         return ret;
 566 }
 567
 568 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 569                               struct iwl_lq_sta *lq_data,
 570                               struct ieee80211_sta *sta)
 571 {
 572         if (tid < IWL_MAX_TID_COUNT)
 573                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 574         else
 575                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 576                         tid, IWL_MAX_TID_COUNT);
 577 }
 578
 579 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 580 {
 581         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 582                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 583                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 584 }
 585
 586 /*
 587  * Static function to get the expected throughput from an iwl_scale_tbl_info
 588  * that wraps a NULL pointer check
 589  */
 590 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 591 {
 592         if (tbl->expected_tpt)
 593                 return tbl->expected_tpt[rs_index];
 594         return 0;
 595 }
 596
 597 /**
 598  * rs_collect_tx_data - Update the success/failure sliding window
 599  *
 600  * We keep a sliding window of the last 62 packets transmitted
 601  * at this rate.  window->data contains the bitmask of successful
 602  * packets.
 603  */
 604 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
 605                                struct iwl_scale_tbl_info *tbl,
 606                                int scale_index, int attempts, int successes,
 607                                struct iwl_rate_scale_data *window)
 608 {
 609         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 610         s32 fail_count, tpt;
 611
 612         /* Get expected throughput */
 613         tpt = get_expected_tpt(tbl, scale_index);
 614
 615         /*
 616          * Keep track of only the latest 62 tx frame attempts in this rate's
 617          * history window; anything older isn't really relevant any more.
 618          * If we have filled up the sliding window, drop the oldest attempt;
 619          * if the oldest attempt (highest bit in bitmap) shows "success",
 620          * subtract "1" from the success counter (this is the main reason
 621          * we keep these bitmaps!).
 622          */
 623         while (attempts > 0) {
 624                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 625                         /* remove earliest */
 626                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 627
 628                         if (window->data & mask) {
 629                                 window->data &= ~mask;
 630                                 window->success_counter--;
 631                         }
 632                 }
 633
 634                 /* Increment frames-attempted counter */
 635                 window->counter++;
 636
 637                 /* Shift bitmap by one frame to throw away oldest history */
 638                 window->data <<= 1;
 639
 640                 /* Mark the most recent #successes attempts as successful */
 641                 if (successes > 0) {
 642                         window->success_counter++;
 643                         window->data |= 0x1;
 644                         successes--;
 645                 }
 646
 647                 attempts--;
 648         }
 649
 650         /* Calculate current success ratio, avoid divide-by-0! */
 651         if (window->counter > 0)
 652                 window->success_ratio = 128 * (100 * window->success_counter)
 653                                         / window->counter;
 654         else
 655                 window->success_ratio = IWL_INVALID_VALUE;
 656
 657         fail_count = window->counter - window->success_counter;
 658
 659         /* Calculate average throughput, if we have enough history. */
 660         if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
 661             (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
 662                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 663         else
 664                 window->average_tpt = IWL_INVALID_VALUE;
 665
 666         return 0;
 667 }
 668
 669 static int rs_collect_tx_data(struct iwl_mvm *mvm,
 670                               struct iwl_lq_sta *lq_sta,
 671                               struct iwl_scale_tbl_info *tbl,
 672                               int scale_index, int attempts, int successes,
 673                               u8 reduced_txp)
 674 {
 675         struct iwl_rate_scale_data *window = NULL;
 676         int ret;
 677
 678         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 679                 return -EINVAL;
 680
 681         if (tbl->column != RS_COLUMN_INVALID) {
 682                 struct lq_sta_pers *pers = &lq_sta->pers;
 683
 684                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 685                 pers->tx_stats[tbl->column][scale_index].success += successes;
 686         }
 687
 688         /* Select window for current tx bit rate */
 689         window = &(tbl->win[scale_index]);
 690
 691         ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 692                                   window);
 693         if (ret)
 694                 return ret;
 695
 696         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 697                 return -EINVAL;
 698
 699         window = &tbl->tpc_win[reduced_txp];
 700         return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 701                                    window);
 702 }
 703
 704 /* Convert rs_rate object into ucode rate bitmask */
 705 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 706                                   struct rs_rate *rate)
 707 {
 708         u32 ucode_rate = 0;
 709         int index = rate->index;
 710
 711         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 712                          RATE_MCS_ANT_ABC_MSK);
 713
 714         if (is_legacy(rate)) {
 715                 ucode_rate |= iwl_rates[index].plcp;
 716                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 717                         ucode_rate |= RATE_MCS_CCK_MSK;
 718                 return ucode_rate;
 719         }
 720
 721         if (is_ht(rate)) {
 722                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 723                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 724                         index = IWL_LAST_HT_RATE;
 725                 }
 726                 ucode_rate |= RATE_MCS_HT_MSK;
 727
 728                 if (is_ht_siso(rate))
 729                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 730                 else if (is_ht_mimo2(rate))
 731                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 732                 else
 733                         WARN_ON_ONCE(1);
 734         } else if (is_vht(rate)) {
 735                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 736                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 737                         index = IWL_LAST_VHT_RATE;
 738                 }
 739                 ucode_rate |= RATE_MCS_VHT_MSK;
 740                 if (is_vht_siso(rate))
 741                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 742                 else if (is_vht_mimo2(rate))
 743                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 744                 else
 745                         WARN_ON_ONCE(1);
 746
 747         } else {
 748                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 749         }
 750
 751         if (is_siso(rate) && rate->stbc) {
 752                 /* To enable STBC we need to set both a flag and ANT_AB */
 753                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 754                 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
 755         }
 756
 757         ucode_rate |= rate->bw;
 758         if (rate->sgi)
 759                 ucode_rate |= RATE_MCS_SGI_MSK;
 760         if (rate->ldpc)
 761                 ucode_rate |= RATE_MCS_LDPC_MSK;
 762
 763         return ucode_rate;
 764 }
 765
 766 /* Convert a ucode rate into an rs_rate object */
 767 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 768                                    enum ieee80211_band band,
 769                                    struct rs_rate *rate)
 770 {
 771         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 772         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 773         u8 nss;
 774
 775         memset(rate, 0, sizeof(*rate));
 776         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 777
 778         if (rate->index == IWL_RATE_INVALID)
 779                 return -EINVAL;
 780
 781         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 782
 783         /* Legacy */
 784         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 785             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 786                 if (num_of_ant == 1) {
 787                         if (band == IEEE80211_BAND_5GHZ)
 788                                 rate->type = LQ_LEGACY_A;
 789                         else
 790                                 rate->type = LQ_LEGACY_G;
 791                 }
 792
 793                 return 0;
 794         }
 795
 796         /* HT or VHT */
 797         if (ucode_rate & RATE_MCS_SGI_MSK)
 798                 rate->sgi = true;
 799         if (ucode_rate & RATE_MCS_LDPC_MSK)
 800                 rate->ldpc = true;
 801         if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
 802                 rate->stbc = true;
 803
 804         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 805
 806         if (ucode_rate & RATE_MCS_HT_MSK) {
 807                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 808                        RATE_HT_MCS_NSS_POS) + 1;
 809
 810                 if (nss == 1) {
 811                         rate->type = LQ_HT_SISO;
 812                         WARN_ON_ONCE(!rate->stbc && num_of_ant != 1);
 813                 } else if (nss == 2) {
 814                         rate->type = LQ_HT_MIMO2;
 815                         WARN_ON_ONCE(num_of_ant != 2);
 816                 } else {
 817                         WARN_ON_ONCE(1);
 818                 }
 819         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 820                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 821                        RATE_VHT_MCS_NSS_POS) + 1;
 822
 823                 if (nss == 1) {
 824                         rate->type = LQ_VHT_SISO;
 825                         WARN_ON_ONCE(!rate->stbc && num_of_ant != 1);
 826                 } else if (nss == 2) {
 827                         rate->type = LQ_VHT_MIMO2;
 828                         WARN_ON_ONCE(num_of_ant != 2);
 829                 } else {
 830                         WARN_ON_ONCE(1);
 831                 }
 832         }
 833
 834         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
 835         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 836                      !is_vht(rate));
 837
 838         return 0;
 839 }
 840
 841 /* switch to another antenna/antennas and return 1 */
 842 /* if no other valid antenna found, return 0 */
 843 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 844 {
 845         u8 new_ant_type;
 846
 847         if (!rate->ant || rate->ant > ANT_ABC)
 848                 return 0;
 849
 850         if (!rs_is_valid_ant(valid_ant, rate->ant))
 851                 return 0;
 852
 853         new_ant_type = ant_toggle_lookup[rate->ant];
 854
 855         while ((new_ant_type != rate->ant) &&
 856                !rs_is_valid_ant(valid_ant, new_ant_type))
 857                 new_ant_type = ant_toggle_lookup[new_ant_type];
 858
 859         if (new_ant_type == rate->ant)
 860                 return 0;
 861
 862         rate->ant = new_ant_type;
 863
 864         return 1;
 865 }
 866
 867 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 868                                   struct rs_rate *rate)
 869 {
 870         if (is_legacy(rate))
 871                 return lq_sta->active_legacy_rate;
 872         else if (is_siso(rate))
 873                 return lq_sta->active_siso_rate;
 874         else if (is_mimo2(rate))
 875                 return lq_sta->active_mimo2_rate;
 876
 877         WARN_ON_ONCE(1);
 878         return 0;
 879 }
 880
 881 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 882                                 int rate_type)
 883 {
 884         u8 high = IWL_RATE_INVALID;
 885         u8 low = IWL_RATE_INVALID;
 886
 887         /* 802.11A or ht walks to the next literal adjacent rate in
 888          * the rate table */
 889         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 890                 int i;
 891                 u32 mask;
 892
 893                 /* Find the previous rate that is in the rate mask */
 894                 i = index - 1;
 895                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 896                         if (rate_mask & mask) {
 897                                 low = i;
 898                                 break;
 899                         }
 900                 }
 901
 902                 /* Find the next rate that is in the rate mask */
 903                 i = index + 1;
 904                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 905                         if (rate_mask & mask) {
 906                                 high = i;
 907                                 break;
 908                         }
 909                 }
 910
 911                 return (high << 8) | low;
 912         }
 913
 914         low = index;
 915         while (low != IWL_RATE_INVALID) {
 916                 low = iwl_rates[low].prev_rs;
 917                 if (low == IWL_RATE_INVALID)
 918                         break;
 919                 if (rate_mask & (1 << low))
 920                         break;
 921         }
 922
 923         high = index;
 924         while (high != IWL_RATE_INVALID) {
 925                 high = iwl_rates[high].next_rs;
 926                 if (high == IWL_RATE_INVALID)
 927                         break;
 928                 if (rate_mask & (1 << high))
 929                         break;
 930         }
 931
 932         return (high << 8) | low;
 933 }
 934
 935 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
 936                                      struct rs_rate *rate)
 937 {
 938         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
 939 }
 940
 941 /* Get the next supported lower rate in the current column.
 942  * Return true if bottom rate in the current column was reached
 943  */
 944 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
 945                                         struct rs_rate *rate)
 946 {
 947         u8 low;
 948         u16 high_low;
 949         u16 rate_mask;
 950         struct iwl_mvm *mvm = lq_sta->pers.drv;
 951
 952         rate_mask = rs_get_supported_rates(lq_sta, rate);
 953         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
 954                                         rate->type);
 955         low = high_low & 0xff;
 956
 957         /* Bottom rate of column reached */
 958         if (low == IWL_RATE_INVALID)
 959                 return true;
 960
 961         rate->index = low;
 962         return false;
 963 }
 964
 965 /* Get the next rate to use following a column downgrade */
 966 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
 967                                           struct rs_rate *rate)
 968 {
 969         struct iwl_mvm *mvm = lq_sta->pers.drv;
 970
 971         if (is_legacy(rate)) {
 972                 /* No column to downgrade from Legacy */
 973                 return;
 974         } else if (is_siso(rate)) {
 975                 /* Downgrade to Legacy if we were in SISO */
 976                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 977                         rate->type = LQ_LEGACY_A;
 978                 else
 979                         rate->type = LQ_LEGACY_G;
 980
 981                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
 982
 983                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
 984                              rate->index > IWL_RATE_MCS_9_INDEX);
 985
 986                 rate->index = rs_ht_to_legacy[rate->index];
 987                 rate->ldpc = false;
 988         } else {
 989                 /* Downgrade to SISO with same MCS if in MIMO  */
 990                 rate->type = is_vht_mimo2(rate) ?
 991                         LQ_VHT_SISO : LQ_HT_SISO;
 992         }
 993
 994         if (num_of_ant(rate->ant) > 1)
 995                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
 996
 997         /* Relevant in both switching to SISO or Legacy */
 998         rate->sgi = false;
 999
1000         if (!rs_rate_supported(lq_sta, rate))
1001                 rs_get_lower_rate_in_column(lq_sta, rate);
1002 }
1003
1004 /* Simple function to compare two rate scale table types */
1005 static inline bool rs_rate_match(struct rs_rate *a,
1006                                  struct rs_rate *b)
1007 {
1008         bool ant_match;
1009
1010         if (a->stbc)
1011                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1012         else
1013                 ant_match = (a->ant == b->ant);
1014
1015         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1016                 && ant_match;
1017 }
1018
1019 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
1020 {
1021         if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
1022                 return RATE_MCS_CHAN_WIDTH_40;
1023         else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
1024                 return RATE_MCS_CHAN_WIDTH_80;
1025         else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
1026                 return RATE_MCS_CHAN_WIDTH_160;
1027
1028         return RATE_MCS_CHAN_WIDTH_20;
1029 }
1030
1031 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1032 {
1033         u8 tid = IWL_MAX_TID_COUNT;
1034
1035         if (ieee80211_is_data_qos(hdr->frame_control)) {
1036                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1037                 tid = qc[0] & 0xf;
1038         }
1039
1040         if (unlikely(tid > IWL_MAX_TID_COUNT))
1041                 tid = IWL_MAX_TID_COUNT;
1042
1043         return tid;
1044 }
1045
1046 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1047                           int tid, struct ieee80211_tx_info *info)
1048 {
1049         int legacy_success;
1050         int retries;
1051         int mac_index, i;
1052         struct iwl_lq_cmd *table;
1053         enum mac80211_rate_control_flags mac_flags;
1054         u32 ucode_rate;
1055         struct rs_rate rate;
1056         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1057         u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1058         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1059         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1060
1061         /* Treat uninitialized rate scaling data same as non-existing. */
1062         if (!lq_sta) {
1063                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1064                 return;
1065         } else if (!lq_sta->pers.drv) {
1066                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1067                 return;
1068         }
1069
1070 #ifdef CONFIG_MAC80211_DEBUGFS
1071         /* Disable last tx check if we are debugging with fixed rate */
1072         if (lq_sta->pers.dbg_fixed_rate) {
1073                 IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n");
1074                 return;
1075         }
1076 #endif
1077         /* This packet was aggregated but doesn't carry status info */
1078         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1079             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1080                 return;
1081
1082         /*
1083          * Ignore this Tx frame response if its initial rate doesn't match
1084          * that of latest Link Quality command.  There may be stragglers
1085          * from a previous Link Quality command, but we're no longer interested
1086          * in those; they're either from the "active" mode while we're trying
1087          * to check "search" mode, or a prior "search" mode after we've moved
1088          * to a new "search" mode (which might become the new "active" mode).
1089          */
1090         table = &lq_sta->lq;
1091         ucode_rate = le32_to_cpu(table->rs_table[0]);
1092         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1093         if (info->band == IEEE80211_BAND_5GHZ)
1094                 rate.index -= IWL_FIRST_OFDM_RATE;
1095         mac_flags = info->status.rates[0].flags;
1096         mac_index = info->status.rates[0].idx;
1097         /* For HT packets, map MCS to PLCP */
1098         if (mac_flags & IEEE80211_TX_RC_MCS) {
1099                 /* Remove # of streams */
1100                 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1101                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1102                         mac_index++;
1103                 /*
1104                  * mac80211 HT index is always zero-indexed; we need to move
1105                  * HT OFDM rates after CCK rates in 2.4 GHz band
1106                  */
1107                 if (info->band == IEEE80211_BAND_2GHZ)
1108                         mac_index += IWL_FIRST_OFDM_RATE;
1109         } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1110                 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1111                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1112                         mac_index++;
1113         }
1114
1115         if (time_after(jiffies,
1116                        (unsigned long)(lq_sta->last_tx +
1117                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1118                 int t;
1119
1120                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1121                 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1122                         ieee80211_stop_tx_ba_session(sta, t);
1123
1124                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1125                 return;
1126         }
1127         lq_sta->last_tx = jiffies;
1128
1129         /* Here we actually compare this rate to the latest LQ command */
1130         if ((mac_index < 0) ||
1131             (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1132             (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1133             (rate.ant != info->status.antenna) ||
1134             (!!(ucode_rate & RATE_MCS_HT_MSK) !=
1135              !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
1136             (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
1137              !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
1138             (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
1139              !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
1140             (rate.index != mac_index)) {
1141                 IWL_DEBUG_RATE(mvm,
1142                                "initial rate %d does not match %d (0x%x)\n",
1143                                mac_index, rate.index, ucode_rate);
1144                 /*
1145                  * Since rates mis-match, the last LQ command may have failed.
1146                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1147                  * ... driver.
1148                  */
1149                 lq_sta->missed_rate_counter++;
1150                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1151                         lq_sta->missed_rate_counter = 0;
1152                         IWL_DEBUG_RATE(mvm,
1153                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1154                                        lq_sta->rs_state);
1155                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1156                 }
1157                 /* Regardless, ignore this status info for outdated rate */
1158                 return;
1159         } else
1160                 /* Rate did match, so reset the missed_rate_counter */
1161                 lq_sta->missed_rate_counter = 0;
1162
1163         if (!lq_sta->search_better_tbl) {
1164                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1165                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1166         } else {
1167                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1168                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1169         }
1170
1171         if (WARN_ON_ONCE(!rs_rate_match(&rate, &curr_tbl->rate))) {
1172                 IWL_DEBUG_RATE(mvm,
1173                                "Neither active nor search matches tx rate\n");
1174                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1175                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1176                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1177                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1178                 rs_dump_rate(mvm, &rate, "ACTUAL");
1179
1180                 /*
1181                  * no matching table found, let's by-pass the data collection
1182                  * and continue to perform rate scale to find the rate table
1183                  */
1184                 rs_stay_in_table(lq_sta, true);
1185                 goto done;
1186         }
1187
1188         /*
1189          * Updating the frame history depends on whether packets were
1190          * aggregated.
1191          *
1192          * For aggregation, all packets were transmitted at the same rate, the
1193          * first index into rate scale table.
1194          */
1195         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1196                 /* ampdu_ack_len = 0 marks no BA was received. In this case
1197                  * treat it as a single frame loss as we don't want the success
1198                  * ratio to dip too quickly because a BA wasn't received
1199                  */
1200                 if (info->status.ampdu_ack_len == 0)
1201                         info->status.ampdu_len = 1;
1202
1203                 ucode_rate = le32_to_cpu(table->rs_table[0]);
1204                 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1205                 rs_collect_tx_data(mvm, lq_sta, curr_tbl, rate.index,
1206                                    info->status.ampdu_len,
1207                                    info->status.ampdu_ack_len,
1208                                    reduced_txp);
1209
1210                 /* Update success/fail counts if not searching for new mode */
1211                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1212                         lq_sta->total_success += info->status.ampdu_ack_len;
1213                         lq_sta->total_failed += (info->status.ampdu_len -
1214                                         info->status.ampdu_ack_len);
1215                 }
1216         } else {
1217         /*
1218          * For legacy, update frame history with for each Tx retry.
1219          */
1220                 retries = info->status.rates[0].count - 1;
1221                 /* HW doesn't send more than 15 retries */
1222                 retries = min(retries, 15);
1223
1224                 /* The last transmission may have been successful */
1225                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1226                 /* Collect data for each rate used during failed TX attempts */
1227                 for (i = 0; i <= retries; ++i) {
1228                         ucode_rate = le32_to_cpu(table->rs_table[i]);
1229                         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1230                         /*
1231                          * Only collect stats if retried rate is in the same RS
1232                          * table as active/search.
1233                          */
1234                         if (rs_rate_match(&rate, &curr_tbl->rate))
1235                                 tmp_tbl = curr_tbl;
1236                         else if (rs_rate_match(&rate, &other_tbl->rate))
1237                                 tmp_tbl = other_tbl;
1238                         else
1239                                 continue;
1240
1241                         rs_collect_tx_data(mvm, lq_sta, tmp_tbl, rate.index, 1,
1242                                            i < retries ? 0 : legacy_success,
1243                                            reduced_txp);
1244                 }
1245
1246                 /* Update success/fail counts if not searching for new mode */
1247                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1248                         lq_sta->total_success += legacy_success;
1249                         lq_sta->total_failed += retries + (1 - legacy_success);
1250                 }
1251         }
1252         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1253         lq_sta->last_rate_n_flags = ucode_rate;
1254         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1255 done:
1256         /* See if there's a better rate or modulation mode to try. */
1257         if (sta->supp_rates[info->band])
1258                 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1259 }
1260
1261 /*
1262  * mac80211 sends us Tx status
1263  */
1264 static void rs_mac80211_tx_status(void *mvm_r,
1265                                   struct ieee80211_supported_band *sband,
1266                                   struct ieee80211_sta *sta, void *priv_sta,
1267                                   struct sk_buff *skb)
1268 {
1269         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1270         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1271         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1272         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1273
1274         if (!ieee80211_is_data(hdr->frame_control) ||
1275             info->flags & IEEE80211_TX_CTL_NO_ACK)
1276                 return;
1277
1278         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1279 }
1280
1281 /*
1282  * Begin a period of staying with a selected modulation mode.
1283  * Set "stay_in_tbl" flag to prevent any mode switches.
1284  * Set frame tx success limits according to legacy vs. high-throughput,
1285  * and reset overall (spanning all rates) tx success history statistics.
1286  * These control how long we stay using same modulation mode before
1287  * searching for a new mode.
1288  */
1289 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1290                                  struct iwl_lq_sta *lq_sta)
1291 {
1292         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1293         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1294         if (is_legacy) {
1295                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1296                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1297                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1298         } else {
1299                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1300                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1301                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1302         }
1303         lq_sta->table_count = 0;
1304         lq_sta->total_failed = 0;
1305         lq_sta->total_success = 0;
1306         lq_sta->flush_timer = jiffies;
1307         lq_sta->visited_columns = 0;
1308 }
1309
1310 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1311 {
1312         if (rate_mask)
1313                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1314         return IWL_RATE_INVALID;
1315 }
1316
1317 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1318                                    const struct rs_tx_column *column)
1319 {
1320         switch (column->mode) {
1321         case RS_LEGACY:
1322                 return lq_sta->max_legacy_rate_idx;
1323         case RS_SISO:
1324                 return lq_sta->max_siso_rate_idx;
1325         case RS_MIMO2:
1326                 return lq_sta->max_mimo2_rate_idx;
1327         default:
1328                 WARN_ON_ONCE(1);
1329         }
1330
1331         return lq_sta->max_legacy_rate_idx;
1332 }
1333
1334 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1335                                             const struct rs_tx_column *column,
1336                                             u32 bw)
1337 {
1338         /* Used to choose among HT tables */
1339         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1340
1341         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1342                          column->mode != RS_SISO &&
1343                          column->mode != RS_MIMO2))
1344                 return expected_tpt_legacy;
1345
1346         /* Legacy rates have only one table */
1347         if (column->mode == RS_LEGACY)
1348                 return expected_tpt_legacy;
1349
1350         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1351         /* Choose among many HT tables depending on number of streams
1352          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1353          * status */
1354         if (column->mode == RS_SISO) {
1355                 switch (bw) {
1356                 case RATE_MCS_CHAN_WIDTH_20:
1357                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1358                         break;
1359                 case RATE_MCS_CHAN_WIDTH_40:
1360                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1361                         break;
1362                 case RATE_MCS_CHAN_WIDTH_80:
1363                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1364                         break;
1365                 default:
1366                         WARN_ON_ONCE(1);
1367                 }
1368         } else if (column->mode == RS_MIMO2) {
1369                 switch (bw) {
1370                 case RATE_MCS_CHAN_WIDTH_20:
1371                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1372                         break;
1373                 case RATE_MCS_CHAN_WIDTH_40:
1374                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1375                         break;
1376                 case RATE_MCS_CHAN_WIDTH_80:
1377                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1378                         break;
1379                 default:
1380                         WARN_ON_ONCE(1);
1381                 }
1382         } else {
1383                 WARN_ON_ONCE(1);
1384         }
1385
1386         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1387                 return ht_tbl_pointer[0];
1388         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1389                 return ht_tbl_pointer[1];
1390         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1391                 return ht_tbl_pointer[2];
1392         else                                            /* AGG+SGI */
1393                 return ht_tbl_pointer[3];
1394 }
1395
1396 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1397                                       struct iwl_scale_tbl_info *tbl)
1398 {
1399         struct rs_rate *rate = &tbl->rate;
1400         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1401
1402         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1403 }
1404
1405 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1406                             struct iwl_lq_sta *lq_sta,
1407                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1408                             unsigned long rate_mask, s8 index)
1409 {
1410         struct iwl_scale_tbl_info *active_tbl =
1411             &(lq_sta->lq_info[lq_sta->active_tbl]);
1412         s32 success_ratio = active_tbl->win[index].success_ratio;
1413         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1414         const u16 *tpt_tbl = tbl->expected_tpt;
1415         u16 high_low;
1416         u32 target_tpt;
1417         int rate_idx;
1418
1419         if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) {
1420                 target_tpt = 100 * expected_current_tpt;
1421                 IWL_DEBUG_RATE(mvm,
1422                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1423                                success_ratio, target_tpt);
1424         } else {
1425                 target_tpt = lq_sta->last_tpt;
1426                 IWL_DEBUG_RATE(mvm,
1427                                "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1428                                success_ratio, target_tpt);
1429         }
1430
1431         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1432
1433         while (rate_idx != IWL_RATE_INVALID) {
1434                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1435                         break;
1436
1437                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1438                                                 tbl->rate.type);
1439
1440                 rate_idx = (high_low >> 8) & 0xff;
1441         }
1442
1443         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1444                        rate_idx, target_tpt,
1445                        rate_idx != IWL_RATE_INVALID ?
1446                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1447
1448         return rate_idx;
1449 }
1450
1451 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1452 {
1453         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1454                 return RATE_MCS_CHAN_WIDTH_80;
1455         else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1456                 return RATE_MCS_CHAN_WIDTH_40;
1457
1458         return RATE_MCS_CHAN_WIDTH_20;
1459 }
1460
1461 /*
1462  * Check whether we should continue using same modulation mode, or
1463  * begin search for a new mode, based on:
1464  * 1) # tx successes or failures while using this mode
1465  * 2) # times calling this function
1466  * 3) elapsed time in this mode (not used, for now)
1467  */
1468 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1469 {
1470         struct iwl_scale_tbl_info *tbl;
1471         int active_tbl;
1472         int flush_interval_passed = 0;
1473         struct iwl_mvm *mvm;
1474
1475         mvm = lq_sta->pers.drv;
1476         active_tbl = lq_sta->active_tbl;
1477
1478         tbl = &(lq_sta->lq_info[active_tbl]);
1479
1480         /* If we've been disallowing search, see if we should now allow it */
1481         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1482                 /* Elapsed time using current modulation mode */
1483                 if (lq_sta->flush_timer)
1484                         flush_interval_passed =
1485                                 time_after(jiffies,
1486                                            (unsigned long)(lq_sta->flush_timer +
1487                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1488
1489                 /*
1490                  * Check if we should allow search for new modulation mode.
1491                  * If many frames have failed or succeeded, or we've used
1492                  * this same modulation for a long time, allow search, and
1493                  * reset history stats that keep track of whether we should
1494                  * allow a new search.  Also (below) reset all bitmaps and
1495                  * stats in active history.
1496                  */
1497                 if (force_search ||
1498                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1499                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1500                     ((!lq_sta->search_better_tbl) &&
1501                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1502                         IWL_DEBUG_RATE(mvm,
1503                                        "LQ: stay is expired %d %d %d\n",
1504                                      lq_sta->total_failed,
1505                                      lq_sta->total_success,
1506                                      flush_interval_passed);
1507
1508                         /* Allow search for new mode */
1509                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1510                         IWL_DEBUG_RATE(mvm,
1511                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1512                         lq_sta->total_failed = 0;
1513                         lq_sta->total_success = 0;
1514                         lq_sta->flush_timer = 0;
1515                         /* mark the current column as visited */
1516                         lq_sta->visited_columns = BIT(tbl->column);
1517                 /*
1518                  * Else if we've used this modulation mode enough repetitions
1519                  * (regardless of elapsed time or success/failure), reset
1520                  * history bitmaps and rate-specific stats for all rates in
1521                  * active table.
1522                  */
1523                 } else {
1524                         lq_sta->table_count++;
1525                         if (lq_sta->table_count >=
1526                             lq_sta->table_count_limit) {
1527                                 lq_sta->table_count = 0;
1528
1529                                 IWL_DEBUG_RATE(mvm,
1530                                                "LQ: stay in table clear win\n");
1531                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1532                         }
1533                 }
1534
1535                 /* If transitioning to allow "search", reset all history
1536                  * bitmaps and stats in active table (this will become the new
1537                  * "search" table). */
1538                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1539                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1540                 }
1541         }
1542 }
1543
1544 /*
1545  * setup rate table in uCode
1546  */
1547 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1548                                struct ieee80211_sta *sta,
1549                                struct iwl_lq_sta *lq_sta,
1550                                struct rs_rate *rate)
1551 {
1552         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
1553         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1554 }
1555
1556 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1557                                          struct iwl_lq_sta *lq_sta,
1558                                          struct ieee80211_sta *sta,
1559                                          struct iwl_scale_tbl_info *tbl)
1560 {
1561         int i, j, max_rate;
1562         enum rs_column next_col_id;
1563         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1564         const struct rs_tx_column *next_col;
1565         allow_column_func_t allow_func;
1566         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1567         const u16 *expected_tpt_tbl;
1568         u16 tpt, max_expected_tpt;
1569
1570         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1571                 next_col_id = curr_col->next_columns[i];
1572
1573                 if (next_col_id == RS_COLUMN_INVALID)
1574                         continue;
1575
1576                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1577                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1578                                        next_col_id);
1579                         continue;
1580                 }
1581
1582                 next_col = &rs_tx_columns[next_col_id];
1583
1584                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1585                         IWL_DEBUG_RATE(mvm,
1586                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1587                                        next_col_id, valid_ants, next_col->ant);
1588                         continue;
1589                 }
1590
1591                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1592                         allow_func = next_col->checks[j];
1593                         if (allow_func && !allow_func(mvm, sta, tbl))
1594                                 break;
1595                 }
1596
1597                 if (j != MAX_COLUMN_CHECKS) {
1598                         IWL_DEBUG_RATE(mvm,
1599                                        "Skip column %d: not allowed (check %d failed)\n",
1600                                        next_col_id, j);
1601
1602                         continue;
1603                 }
1604
1605                 tpt = lq_sta->last_tpt / 100;
1606                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1607                                                      rs_bw_from_sta_bw(sta));
1608                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1609                         continue;
1610
1611                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1612                 if (max_rate == IWL_RATE_INVALID) {
1613                         IWL_DEBUG_RATE(mvm,
1614                                        "Skip column %d: no rate is allowed in this column\n",
1615                                        next_col_id);
1616                         continue;
1617                 }
1618
1619                 max_expected_tpt = expected_tpt_tbl[max_rate];
1620                 if (tpt >= max_expected_tpt) {
1621                         IWL_DEBUG_RATE(mvm,
1622                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1623                                        next_col_id, max_expected_tpt, tpt);
1624                         continue;
1625                 }
1626
1627                 IWL_DEBUG_RATE(mvm,
1628                                "Found potential column %d. Max expected %d current %d\n",
1629                                next_col_id, max_expected_tpt, tpt);
1630                 break;
1631         }
1632
1633         if (i == MAX_NEXT_COLUMNS)
1634                 return RS_COLUMN_INVALID;
1635
1636         return next_col_id;
1637 }
1638
1639 static int rs_switch_to_column(struct iwl_mvm *mvm,
1640                                struct iwl_lq_sta *lq_sta,
1641                                struct ieee80211_sta *sta,
1642                                enum rs_column col_id)
1643 {
1644         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1645         struct iwl_scale_tbl_info *search_tbl =
1646                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1647         struct rs_rate *rate = &search_tbl->rate;
1648         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1649         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1650         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1651                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1652         unsigned long rate_mask = 0;
1653         u32 rate_idx = 0;
1654
1655         memcpy(search_tbl, tbl, sz);
1656
1657         rate->sgi = column->sgi;
1658         rate->ant = column->ant;
1659
1660         if (column->mode == RS_LEGACY) {
1661                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1662                         rate->type = LQ_LEGACY_A;
1663                 else
1664                         rate->type = LQ_LEGACY_G;
1665
1666                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1667                 rate->ldpc = false;
1668                 rate_mask = lq_sta->active_legacy_rate;
1669         } else if (column->mode == RS_SISO) {
1670                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1671                 rate_mask = lq_sta->active_siso_rate;
1672         } else if (column->mode == RS_MIMO2) {
1673                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1674                 rate_mask = lq_sta->active_mimo2_rate;
1675         } else {
1676                 WARN_ON_ONCE("Bad column mode");
1677         }
1678
1679         if (column->mode != RS_LEGACY) {
1680                 rate->bw = rs_bw_from_sta_bw(sta);
1681                 rate->ldpc = lq_sta->ldpc;
1682         }
1683
1684         search_tbl->column = col_id;
1685         rs_set_expected_tpt_table(lq_sta, search_tbl);
1686
1687         lq_sta->visited_columns |= BIT(col_id);
1688
1689         /* Get the best matching rate if we're changing modes. e.g.
1690          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1691          */
1692         if (curr_column->mode != column->mode) {
1693                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1694                                             rate_mask, rate->index);
1695
1696                 if ((rate_idx == IWL_RATE_INVALID) ||
1697                     !(BIT(rate_idx) & rate_mask)) {
1698                         IWL_DEBUG_RATE(mvm,
1699                                        "can not switch with index %d"
1700                                        " rate mask %lx\n",
1701                                        rate_idx, rate_mask);
1702
1703                         goto err;
1704                 }
1705
1706                 rate->index = rate_idx;
1707         }
1708
1709         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1710                        col_id, rate->index);
1711
1712         return 0;
1713
1714 err:
1715         rate->type = LQ_NONE;
1716         return -1;
1717 }
1718
1719 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1720                                          struct iwl_scale_tbl_info *tbl,
1721                                          s32 sr, int low, int high,
1722                                          int current_tpt,
1723                                          int low_tpt, int high_tpt)
1724 {
1725         enum rs_action action = RS_ACTION_STAY;
1726
1727         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1728             (current_tpt == 0)) {
1729                 IWL_DEBUG_RATE(mvm,
1730                                "Decrease rate because of low SR\n");
1731                 return RS_ACTION_DOWNSCALE;
1732         }
1733
1734         if ((low_tpt == IWL_INVALID_VALUE) &&
1735             (high_tpt == IWL_INVALID_VALUE) &&
1736             (high != IWL_RATE_INVALID)) {
1737                 IWL_DEBUG_RATE(mvm,
1738                                "No data about high/low rates. Increase rate\n");
1739                 return RS_ACTION_UPSCALE;
1740         }
1741
1742         if ((high_tpt == IWL_INVALID_VALUE) &&
1743             (high != IWL_RATE_INVALID) &&
1744             (low_tpt != IWL_INVALID_VALUE) &&
1745             (low_tpt < current_tpt)) {
1746                 IWL_DEBUG_RATE(mvm,
1747                                "No data about high rate and low rate is worse. Increase rate\n");
1748                 return RS_ACTION_UPSCALE;
1749         }
1750
1751         if ((high_tpt != IWL_INVALID_VALUE) &&
1752             (high_tpt > current_tpt)) {
1753                 IWL_DEBUG_RATE(mvm,
1754                                "Higher rate is better. Increate rate\n");
1755                 return RS_ACTION_UPSCALE;
1756         }
1757
1758         if ((low_tpt != IWL_INVALID_VALUE) &&
1759             (high_tpt != IWL_INVALID_VALUE) &&
1760             (low_tpt < current_tpt) &&
1761             (high_tpt < current_tpt)) {
1762                 IWL_DEBUG_RATE(mvm,
1763                                "Both high and low are worse. Maintain rate\n");
1764                 return RS_ACTION_STAY;
1765         }
1766
1767         if ((low_tpt != IWL_INVALID_VALUE) &&
1768             (low_tpt > current_tpt)) {
1769                 IWL_DEBUG_RATE(mvm,
1770                                "Lower rate is better\n");
1771                 action = RS_ACTION_DOWNSCALE;
1772                 goto out;
1773         }
1774
1775         if ((low_tpt == IWL_INVALID_VALUE) &&
1776             (low != IWL_RATE_INVALID)) {
1777                 IWL_DEBUG_RATE(mvm,
1778                                "No data about lower rate\n");
1779                 action = RS_ACTION_DOWNSCALE;
1780                 goto out;
1781         }
1782
1783         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1784
1785 out:
1786         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1787                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1788                         IWL_DEBUG_RATE(mvm,
1789                                        "SR is above NO DECREASE. Avoid downscale\n");
1790                         action = RS_ACTION_STAY;
1791                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1792                         IWL_DEBUG_RATE(mvm,
1793                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1794                         action = RS_ACTION_STAY;
1795                 } else {
1796                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1797                 }
1798         }
1799
1800         return action;
1801 }
1802
1803 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1804                           struct iwl_lq_sta *lq_sta)
1805 {
1806         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1807          * supports STBC of at least 1*SS
1808          */
1809         if (!lq_sta->stbc_capable)
1810                 return false;
1811
1812         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1813                 return false;
1814
1815         return true;
1816 }
1817
1818 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1819                                 int *weaker, int *stronger)
1820 {
1821         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1822         if (*weaker > TPC_MAX_REDUCTION)
1823                 *weaker = TPC_INVALID;
1824
1825         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1826         if (*stronger < 0)
1827                 *stronger = TPC_INVALID;
1828 }
1829
1830 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1831                            struct rs_rate *rate, enum ieee80211_band band)
1832 {
1833         int index = rate->index;
1834         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1835         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1836                                 !vif->bss_conf.ps);
1837
1838         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1839                        cam, sta_ps_disabled);
1840         /*
1841          * allow tpc only if power management is enabled, or bt coex
1842          * activity grade allows it and we are on 2.4Ghz.
1843          */
1844         if ((cam || sta_ps_disabled) &&
1845             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1846                 return false;
1847
1848         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1849         if (is_legacy(rate))
1850                 return index == IWL_RATE_54M_INDEX;
1851         if (is_ht(rate))
1852                 return index == IWL_RATE_MCS_7_INDEX;
1853         if (is_vht(rate))
1854                 return index == IWL_RATE_MCS_7_INDEX ||
1855                        index == IWL_RATE_MCS_8_INDEX ||
1856                        index == IWL_RATE_MCS_9_INDEX;
1857
1858         WARN_ON_ONCE(1);
1859         return false;
1860 }
1861
1862 enum tpc_action {
1863         TPC_ACTION_STAY,
1864         TPC_ACTION_DECREASE,
1865         TPC_ACTION_INCREASE,
1866         TPC_ACTION_NO_RESTIRCTION,
1867 };
1868
1869 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1870                                          s32 sr, int weak, int strong,
1871                                          int current_tpt,
1872                                          int weak_tpt, int strong_tpt)
1873 {
1874         /* stay until we have valid tpt */
1875         if (current_tpt == IWL_INVALID_VALUE) {
1876                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1877                 return TPC_ACTION_STAY;
1878         }
1879
1880         /* Too many failures, increase txp */
1881         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1882             current_tpt == 0) {
1883                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1884                 return TPC_ACTION_NO_RESTIRCTION;
1885         }
1886
1887         /* try decreasing first if applicable */
1888         if (weak != TPC_INVALID) {
1889                 if (weak_tpt == IWL_INVALID_VALUE &&
1890                     (strong_tpt == IWL_INVALID_VALUE ||
1891                      current_tpt >= strong_tpt)) {
1892                         IWL_DEBUG_RATE(mvm,
1893                                        "no weak txp measurement. decrease txp\n");
1894                         return TPC_ACTION_DECREASE;
1895                 }
1896
1897                 if (weak_tpt > current_tpt) {
1898                         IWL_DEBUG_RATE(mvm,
1899                                        "lower txp has better tpt. decrease txp\n");
1900                         return TPC_ACTION_DECREASE;
1901                 }
1902         }
1903
1904         /* next, increase if needed */
1905         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1906             strong != TPC_INVALID) {
1907                 if (weak_tpt == IWL_INVALID_VALUE &&
1908                     strong_tpt != IWL_INVALID_VALUE &&
1909                     current_tpt < strong_tpt) {
1910                         IWL_DEBUG_RATE(mvm,
1911                                        "higher txp has better tpt. increase txp\n");
1912                         return TPC_ACTION_INCREASE;
1913                 }
1914
1915                 if (weak_tpt < current_tpt &&
1916                     (strong_tpt == IWL_INVALID_VALUE ||
1917                      strong_tpt > current_tpt)) {
1918                         IWL_DEBUG_RATE(mvm,
1919                                        "lower txp has worse tpt. increase txp\n");
1920                         return TPC_ACTION_INCREASE;
1921                 }
1922         }
1923
1924         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1925         return TPC_ACTION_STAY;
1926 }
1927
1928 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1929                            struct ieee80211_sta *sta,
1930                            struct iwl_lq_sta *lq_sta,
1931                            struct iwl_scale_tbl_info *tbl)
1932 {
1933         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1934         struct ieee80211_vif *vif = mvm_sta->vif;
1935         struct ieee80211_chanctx_conf *chanctx_conf;
1936         enum ieee80211_band band;
1937         struct iwl_rate_scale_data *window;
1938         struct rs_rate *rate = &tbl->rate;
1939         enum tpc_action action;
1940         s32 sr;
1941         u8 cur = lq_sta->lq.reduced_tpc;
1942         int current_tpt;
1943         int weak, strong;
1944         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1945
1946 #ifdef CONFIG_MAC80211_DEBUGFS
1947         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1948                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1949                                lq_sta->pers.dbg_fixed_txp_reduction);
1950                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1951                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1952         }
1953 #endif
1954
1955         rcu_read_lock();
1956         chanctx_conf = rcu_dereference(vif->chanctx_conf);
1957         if (WARN_ON(!chanctx_conf))
1958                 band = IEEE80211_NUM_BANDS;
1959         else
1960                 band = chanctx_conf->def.chan->band;
1961         rcu_read_unlock();
1962
1963         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1964                 IWL_DEBUG_RATE(mvm,
1965                                "tpc is not allowed. remove txp restrictions\n");
1966                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1967                 return cur != TPC_NO_REDUCTION;
1968         }
1969
1970         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1971
1972         /* Collect measured throughputs for current and adjacent rates */
1973         window = tbl->tpc_win;
1974         sr = window[cur].success_ratio;
1975         current_tpt = window[cur].average_tpt;
1976         if (weak != TPC_INVALID)
1977                 weak_tpt = window[weak].average_tpt;
1978         if (strong != TPC_INVALID)
1979                 strong_tpt = window[strong].average_tpt;
1980
1981         IWL_DEBUG_RATE(mvm,
1982                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1983                        cur, current_tpt, sr, weak, strong,
1984                        weak_tpt, strong_tpt);
1985
1986         action = rs_get_tpc_action(mvm, sr, weak, strong,
1987                                    current_tpt, weak_tpt, strong_tpt);
1988
1989         /* override actions if we are on the edge */
1990         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
1991                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
1992                 action = TPC_ACTION_STAY;
1993         } else if (strong == TPC_INVALID &&
1994                    (action == TPC_ACTION_INCREASE ||
1995                     action == TPC_ACTION_NO_RESTIRCTION)) {
1996                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
1997                 action = TPC_ACTION_STAY;
1998         }
1999
2000         switch (action) {
2001         case TPC_ACTION_DECREASE:
2002                 lq_sta->lq.reduced_tpc = weak;
2003                 return true;
2004         case TPC_ACTION_INCREASE:
2005                 lq_sta->lq.reduced_tpc = strong;
2006                 return true;
2007         case TPC_ACTION_NO_RESTIRCTION:
2008                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2009                 return true;
2010         case TPC_ACTION_STAY:
2011                 /* do nothing */
2012                 break;
2013         }
2014         return false;
2015 }
2016
2017 /*
2018  * Do rate scaling and search for new modulation mode.
2019  */
2020 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2021                                   struct ieee80211_sta *sta,
2022                                   struct iwl_lq_sta *lq_sta,
2023                                   int tid)
2024 {
2025         int low = IWL_RATE_INVALID;
2026         int high = IWL_RATE_INVALID;
2027         int index;
2028         struct iwl_rate_scale_data *window = NULL;
2029         int current_tpt = IWL_INVALID_VALUE;
2030         int low_tpt = IWL_INVALID_VALUE;
2031         int high_tpt = IWL_INVALID_VALUE;
2032         u32 fail_count;
2033         enum rs_action scale_action = RS_ACTION_STAY;
2034         u16 rate_mask;
2035         u8 update_lq = 0;
2036         struct iwl_scale_tbl_info *tbl, *tbl1;
2037         u8 active_tbl = 0;
2038         u8 done_search = 0;
2039         u16 high_low;
2040         s32 sr;
2041         u8 prev_agg = lq_sta->is_agg;
2042         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2043         struct iwl_mvm_tid_data *tid_data;
2044         struct rs_rate *rate;
2045
2046         lq_sta->is_agg = !!sta_priv->agg_tids;
2047
2048         /*
2049          * Select rate-scale / modulation-mode table to work with in
2050          * the rest of this function:  "search" if searching for better
2051          * modulation mode, or "active" if doing rate scaling within a mode.
2052          */
2053         if (!lq_sta->search_better_tbl)
2054                 active_tbl = lq_sta->active_tbl;
2055         else
2056                 active_tbl = 1 - lq_sta->active_tbl;
2057
2058         tbl = &(lq_sta->lq_info[active_tbl]);
2059         rate = &tbl->rate;
2060
2061         if (prev_agg != lq_sta->is_agg) {
2062                 IWL_DEBUG_RATE(mvm,
2063                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2064                                prev_agg, lq_sta->is_agg);
2065                 rs_set_expected_tpt_table(lq_sta, tbl);
2066                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2067         }
2068
2069         /* current tx rate */
2070         index = lq_sta->last_txrate_idx;
2071
2072         /* rates available for this association, and for modulation mode */
2073         rate_mask = rs_get_supported_rates(lq_sta, rate);
2074
2075         if (!(BIT(index) & rate_mask)) {
2076                 IWL_ERR(mvm, "Current Rate is not valid\n");
2077                 if (lq_sta->search_better_tbl) {
2078                         /* revert to active table if search table is not valid*/
2079                         rate->type = LQ_NONE;
2080                         lq_sta->search_better_tbl = 0;
2081                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2082                         rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2083                 }
2084                 return;
2085         }
2086
2087         /* Get expected throughput table and history window for current rate */
2088         if (!tbl->expected_tpt) {
2089                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2090                 return;
2091         }
2092
2093         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2094         window = &(tbl->win[index]);
2095
2096         /*
2097          * If there is not enough history to calculate actual average
2098          * throughput, keep analyzing results of more tx frames, without
2099          * changing rate or mode (bypass most of the rest of this function).
2100          * Set up new rate table in uCode only if old rate is not supported
2101          * in current association (use new rate found above).
2102          */
2103         fail_count = window->counter - window->success_counter;
2104         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2105             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2106                 IWL_DEBUG_RATE(mvm,
2107                                "(%s: %d): Test Window: succ %d total %d\n",
2108                                rs_pretty_lq_type(rate->type),
2109                                index, window->success_counter, window->counter);
2110
2111                 /* Can't calculate this yet; not enough history */
2112                 window->average_tpt = IWL_INVALID_VALUE;
2113
2114                 /* Should we stay with this modulation mode,
2115                  * or search for a new one? */
2116                 rs_stay_in_table(lq_sta, false);
2117
2118                 goto out;
2119         }
2120         /* Else we have enough samples; calculate estimate of
2121          * actual average throughput */
2122         if (window->average_tpt != ((window->success_ratio *
2123                         tbl->expected_tpt[index] + 64) / 128)) {
2124                 window->average_tpt = ((window->success_ratio *
2125                                         tbl->expected_tpt[index] + 64) / 128);
2126         }
2127
2128         /* If we are searching for better modulation mode, check success. */
2129         if (lq_sta->search_better_tbl) {
2130                 /* If good success, continue using the "search" mode;
2131                  * no need to send new link quality command, since we're
2132                  * continuing to use the setup that we've been trying. */
2133                 if (window->average_tpt > lq_sta->last_tpt) {
2134                         IWL_DEBUG_RATE(mvm,
2135                                        "SWITCHING TO NEW TABLE SR: %d "
2136                                        "cur-tpt %d old-tpt %d\n",
2137                                        window->success_ratio,
2138                                        window->average_tpt,
2139                                        lq_sta->last_tpt);
2140
2141                         /* Swap tables; "search" becomes "active" */
2142                         lq_sta->active_tbl = active_tbl;
2143                         current_tpt = window->average_tpt;
2144                 /* Else poor success; go back to mode in "active" table */
2145                 } else {
2146                         IWL_DEBUG_RATE(mvm,
2147                                        "GOING BACK TO THE OLD TABLE: SR %d "
2148                                        "cur-tpt %d old-tpt %d\n",
2149                                        window->success_ratio,
2150                                        window->average_tpt,
2151                                        lq_sta->last_tpt);
2152
2153                         /* Nullify "search" table */
2154                         rate->type = LQ_NONE;
2155
2156                         /* Revert to "active" table */
2157                         active_tbl = lq_sta->active_tbl;
2158                         tbl = &(lq_sta->lq_info[active_tbl]);
2159
2160                         /* Revert to "active" rate and throughput info */
2161                         index = tbl->rate.index;
2162                         current_tpt = lq_sta->last_tpt;
2163
2164                         /* Need to set up a new rate table in uCode */
2165                         update_lq = 1;
2166                 }
2167
2168                 /* Either way, we've made a decision; modulation mode
2169                  * search is done, allow rate adjustment next time. */
2170                 lq_sta->search_better_tbl = 0;
2171                 done_search = 1;        /* Don't switch modes below! */
2172                 goto lq_update;
2173         }
2174
2175         /* (Else) not in search of better modulation mode, try for better
2176          * starting rate, while staying in this mode. */
2177         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2178         low = high_low & 0xff;
2179         high = (high_low >> 8) & 0xff;
2180
2181         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2182
2183         sr = window->success_ratio;
2184
2185         /* Collect measured throughputs for current and adjacent rates */
2186         current_tpt = window->average_tpt;
2187         if (low != IWL_RATE_INVALID)
2188                 low_tpt = tbl->win[low].average_tpt;
2189         if (high != IWL_RATE_INVALID)
2190                 high_tpt = tbl->win[high].average_tpt;
2191
2192         IWL_DEBUG_RATE(mvm,
2193                        "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2194                        rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2195                        low, high, low_tpt, high_tpt);
2196
2197         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2198                                           current_tpt, low_tpt, high_tpt);
2199
2200         /* Force a search in case BT doesn't like us being in MIMO */
2201         if (is_mimo(rate) &&
2202             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2203                 IWL_DEBUG_RATE(mvm,
2204                                "BT Coex forbids MIMO. Search for new config\n");
2205                 rs_stay_in_table(lq_sta, true);
2206                 goto lq_update;
2207         }
2208
2209         switch (scale_action) {
2210         case RS_ACTION_DOWNSCALE:
2211                 /* Decrease starting rate, update uCode's rate table */
2212                 if (low != IWL_RATE_INVALID) {
2213                         update_lq = 1;
2214                         index = low;
2215                 } else {
2216                         IWL_DEBUG_RATE(mvm,
2217                                        "At the bottom rate. Can't decrease\n");
2218                 }
2219
2220                 break;
2221         case RS_ACTION_UPSCALE:
2222                 /* Increase starting rate, update uCode's rate table */
2223                 if (high != IWL_RATE_INVALID) {
2224                         update_lq = 1;
2225                         index = high;
2226                 } else {
2227                         IWL_DEBUG_RATE(mvm,
2228                                        "At the top rate. Can't increase\n");
2229                 }
2230
2231                 break;
2232         case RS_ACTION_STAY:
2233                 /* No change */
2234                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2235                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2236                 break;
2237         default:
2238                 break;
2239         }
2240
2241 lq_update:
2242         /* Replace uCode's rate table for the destination station. */
2243         if (update_lq) {
2244                 tbl->rate.index = index;
2245                 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2246         }
2247
2248         rs_stay_in_table(lq_sta, false);
2249
2250         /*
2251          * Search for new modulation mode if we're:
2252          * 1)  Not changing rates right now
2253          * 2)  Not just finishing up a search
2254          * 3)  Allowing a new search
2255          */
2256         if (!update_lq && !done_search &&
2257             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2258             && window->counter) {
2259                 enum rs_column next_column;
2260
2261                 /* Save current throughput to compare with "search" throughput*/
2262                 lq_sta->last_tpt = current_tpt;
2263
2264                 IWL_DEBUG_RATE(mvm,
2265                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2266                                update_lq, done_search, lq_sta->rs_state,
2267                                window->counter);
2268
2269                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2270                 if (next_column != RS_COLUMN_INVALID) {
2271                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2272                                                       next_column);
2273                         if (!ret)
2274                                 lq_sta->search_better_tbl = 1;
2275                 } else {
2276                         IWL_DEBUG_RATE(mvm,
2277                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2278                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2279                 }
2280
2281                 /* If new "search" mode was selected, set up in uCode table */
2282                 if (lq_sta->search_better_tbl) {
2283                         /* Access the "search" table, clear its history. */
2284                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2285                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2286
2287                         /* Use new "search" start rate */
2288                         index = tbl->rate.index;
2289
2290                         rs_dump_rate(mvm, &tbl->rate,
2291                                      "Switch to SEARCH TABLE:");
2292                         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
2293                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2294                 } else {
2295                         done_search = 1;
2296                 }
2297         }
2298
2299         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2300                 /* If the "active" (non-search) mode was legacy,
2301                  * and we've tried switching antennas,
2302                  * but we haven't been able to try HT modes (not available),
2303                  * stay with best antenna legacy modulation for a while
2304                  * before next round of mode comparisons. */
2305                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2306                 if (is_legacy(&tbl1->rate)) {
2307                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2308
2309                         if (tid != IWL_MAX_TID_COUNT) {
2310                                 tid_data = &sta_priv->tid_data[tid];
2311                                 if (tid_data->state != IWL_AGG_OFF) {
2312                                         IWL_DEBUG_RATE(mvm,
2313                                                        "Stop aggregation on tid %d\n",
2314                                                        tid);
2315                                         ieee80211_stop_tx_ba_session(sta, tid);
2316                                 }
2317                         }
2318                         rs_set_stay_in_table(mvm, 1, lq_sta);
2319                 } else {
2320                 /* If we're in an HT mode, and all 3 mode switch actions
2321                  * have been tried and compared, stay in this best modulation
2322                  * mode for a while before next round of mode comparisons. */
2323                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2324                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2325                             (tid != IWL_MAX_TID_COUNT)) {
2326                                 tid_data = &sta_priv->tid_data[tid];
2327                                 if (tid_data->state == IWL_AGG_OFF) {
2328                                         IWL_DEBUG_RATE(mvm,
2329                                                        "try to aggregate tid %d\n",
2330                                                        tid);
2331                                         rs_tl_turn_on_agg(mvm, tid,
2332                                                           lq_sta, sta);
2333                                 }
2334                         }
2335                         rs_set_stay_in_table(mvm, 0, lq_sta);
2336                 }
2337         }
2338
2339 out:
2340         lq_sta->last_txrate_idx = index;
2341 }
2342
2343 struct rs_init_rate_info {
2344         s8 rssi;
2345         u8 rate_idx;
2346 };
2347
2348 static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
2349         { -60, IWL_RATE_54M_INDEX },
2350         { -64, IWL_RATE_48M_INDEX },
2351         { -68, IWL_RATE_36M_INDEX },
2352         { -80, IWL_RATE_24M_INDEX },
2353         { -84, IWL_RATE_18M_INDEX },
2354         { -85, IWL_RATE_12M_INDEX },
2355         { -86, IWL_RATE_11M_INDEX },
2356         { -88, IWL_RATE_5M_INDEX  },
2357         { -90, IWL_RATE_2M_INDEX  },
2358         { S8_MIN, IWL_RATE_1M_INDEX },
2359 };
2360
2361 static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
2362         { -60, IWL_RATE_54M_INDEX },
2363         { -64, IWL_RATE_48M_INDEX },
2364         { -72, IWL_RATE_36M_INDEX },
2365         { -80, IWL_RATE_24M_INDEX },
2366         { -84, IWL_RATE_18M_INDEX },
2367         { -85, IWL_RATE_12M_INDEX },
2368         { -87, IWL_RATE_9M_INDEX  },
2369         { S8_MIN, IWL_RATE_6M_INDEX },
2370 };
2371
2372 /* Choose an initial legacy rate and antenna to use based on the RSSI
2373  * of last Rx
2374  */
2375 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2376                                 struct iwl_lq_sta *lq_sta,
2377                                 enum ieee80211_band band,
2378                                 struct rs_rate *rate)
2379 {
2380         int i, nentries;
2381         s8 best_rssi = S8_MIN;
2382         u8 best_ant = ANT_NONE;
2383         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2384         const struct rs_init_rate_info *initial_rates;
2385
2386         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2387                 if (!(lq_sta->pers.chains & BIT(i)))
2388                         continue;
2389
2390                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2391                         best_rssi = lq_sta->pers.chain_signal[i];
2392                         best_ant = BIT(i);
2393                 }
2394         }
2395
2396         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2397                        rs_pretty_ant(best_ant), best_rssi);
2398
2399         if (best_ant != ANT_A && best_ant != ANT_B)
2400                 rate->ant = first_antenna(valid_tx_ant);
2401         else
2402                 rate->ant = best_ant;
2403
2404         rate->sgi = false;
2405         rate->ldpc = false;
2406         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2407
2408         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2409                                      BITS_PER_LONG);
2410
2411         if (band == IEEE80211_BAND_5GHZ) {
2412                 rate->type = LQ_LEGACY_A;
2413                 initial_rates = rs_init_rates_5ghz;
2414                 nentries = ARRAY_SIZE(rs_init_rates_5ghz);
2415         } else {
2416                 rate->type = LQ_LEGACY_G;
2417                 initial_rates = rs_init_rates_24ghz;
2418                 nentries = ARRAY_SIZE(rs_init_rates_24ghz);
2419         }
2420
2421         if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2422                 for (i = 0; i < nentries; i++) {
2423                         int rate_idx = initial_rates[i].rate_idx;
2424                         if ((best_rssi >= initial_rates[i].rssi) &&
2425                             (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2426                                 rate->index = rate_idx;
2427                                 break;
2428                         }
2429                 }
2430         }
2431
2432         IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2433                        rs_pretty_ant(rate->ant));
2434 }
2435
2436 /* Save info about RSSI of last Rx */
2437 void rs_update_last_rssi(struct iwl_mvm *mvm,
2438                          struct iwl_lq_sta *lq_sta,
2439                          struct ieee80211_rx_status *rx_status)
2440 {
2441         lq_sta->pers.chains = rx_status->chains;
2442         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2443         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2444         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2445 }
2446
2447 /**
2448  * rs_initialize_lq - Initialize a station's hardware rate table
2449  *
2450  * The uCode's station table contains a table of fallback rates
2451  * for automatic fallback during transmission.
2452  *
2453  * NOTE: This sets up a default set of values.  These will be replaced later
2454  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2455  *       rc80211_simple.
2456  *
2457  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2458  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2459  *       which requires station table entry to exist).
2460  */
2461 static void rs_initialize_lq(struct iwl_mvm *mvm,
2462                              struct ieee80211_sta *sta,
2463                              struct iwl_lq_sta *lq_sta,
2464                              enum ieee80211_band band,
2465                              bool init)
2466 {
2467         struct iwl_scale_tbl_info *tbl;
2468         struct rs_rate *rate;
2469         u8 active_tbl = 0;
2470
2471         if (!sta || !lq_sta)
2472                 return;
2473
2474         if (!lq_sta->search_better_tbl)
2475                 active_tbl = lq_sta->active_tbl;
2476         else
2477                 active_tbl = 1 - lq_sta->active_tbl;
2478
2479         tbl = &(lq_sta->lq_info[active_tbl]);
2480         rate = &tbl->rate;
2481
2482         rs_get_initial_rate(mvm, lq_sta, band, rate);
2483         lq_sta->last_txrate_idx = rate->index;
2484
2485         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2486         if (rate->ant == ANT_A)
2487                 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2488         else
2489                 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2490
2491         rs_set_expected_tpt_table(lq_sta, tbl);
2492         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2493         /* TODO restore station should remember the lq cmd */
2494         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2495 }
2496
2497 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2498                         struct ieee80211_tx_rate_control *txrc)
2499 {
2500         struct sk_buff *skb = txrc->skb;
2501         struct iwl_op_mode *op_mode __maybe_unused =
2502                         (struct iwl_op_mode *)mvm_r;
2503         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2504         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2505         struct iwl_lq_sta *lq_sta = mvm_sta;
2506
2507         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2508
2509         /* Treat uninitialized rate scaling data same as non-existing. */
2510         if (lq_sta && !lq_sta->pers.drv) {
2511                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2512                 mvm_sta = NULL;
2513         }
2514
2515         /* Send management frames and NO_ACK data using lowest rate. */
2516         if (rate_control_send_low(sta, mvm_sta, txrc))
2517                 return;
2518
2519         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2520                                   info->band, &info->control.rates[0]);
2521
2522         info->control.rates[0].count = 1;
2523 }
2524
2525 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2526                           gfp_t gfp)
2527 {
2528         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2529         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2530         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2531         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2532
2533         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2534
2535         lq_sta->pers.drv = mvm;
2536 #ifdef CONFIG_MAC80211_DEBUGFS
2537         lq_sta->pers.dbg_fixed_rate = 0;
2538         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2539 #endif
2540         lq_sta->pers.chains = 0;
2541         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2542
2543         return &sta_priv->lq_sta;
2544 }
2545
2546 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2547                                        int nss)
2548 {
2549         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2550                 (0x3 << (2 * (nss - 1)));
2551         rx_mcs >>= (2 * (nss - 1));
2552
2553         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2554                 return IWL_RATE_MCS_7_INDEX;
2555         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2556                 return IWL_RATE_MCS_8_INDEX;
2557         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2558                 return IWL_RATE_MCS_9_INDEX;
2559
2560         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2561         return -1;
2562 }
2563
2564 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2565                                      struct ieee80211_sta_vht_cap *vht_cap,
2566                                      struct iwl_lq_sta *lq_sta)
2567 {
2568         int i;
2569         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2570
2571         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2572                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2573                         if (i == IWL_RATE_9M_INDEX)
2574                                 continue;
2575
2576                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2577                         if (i == IWL_RATE_MCS_9_INDEX &&
2578                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2579                                 continue;
2580
2581                         lq_sta->active_siso_rate |= BIT(i);
2582                 }
2583         }
2584
2585         if (sta->rx_nss < 2)
2586                 return;
2587
2588         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2589         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2590                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2591                         if (i == IWL_RATE_9M_INDEX)
2592                                 continue;
2593
2594                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2595                         if (i == IWL_RATE_MCS_9_INDEX &&
2596                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2597                                 continue;
2598
2599                         lq_sta->active_mimo2_rate |= BIT(i);
2600                 }
2601         }
2602 }
2603
2604 static void rs_ht_init(struct iwl_mvm *mvm,
2605                        struct ieee80211_sta *sta,
2606                        struct iwl_lq_sta *lq_sta,
2607                        struct ieee80211_sta_ht_cap *ht_cap)
2608 {
2609         /* active_siso_rate mask includes 9 MBits (bit 5),
2610          * and CCK (bits 0-3), supp_rates[] does not;
2611          * shift to convert format, force 9 MBits off.
2612          */
2613         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2614         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2615         lq_sta->active_siso_rate &= ~((u16)0x2);
2616         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2617
2618         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2619         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2620         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2621         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2622
2623         if (mvm->cfg->ht_params->ldpc &&
2624             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2625                 lq_sta->ldpc = true;
2626
2627         if (mvm->cfg->ht_params->stbc &&
2628             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2629             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2630                 lq_sta->stbc_capable = true;
2631
2632         lq_sta->is_vht = false;
2633 }
2634
2635 static void rs_vht_init(struct iwl_mvm *mvm,
2636                         struct ieee80211_sta *sta,
2637                         struct iwl_lq_sta *lq_sta,
2638                         struct ieee80211_sta_vht_cap *vht_cap)
2639 {
2640         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2641
2642         if (mvm->cfg->ht_params->ldpc &&
2643             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2644                 lq_sta->ldpc = true;
2645
2646         if (mvm->cfg->ht_params->stbc &&
2647             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2648             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2649                 lq_sta->stbc_capable = true;
2650
2651         if ((mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2652             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2653             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2654                 lq_sta->bfer_capable = true;
2655
2656         lq_sta->is_vht = true;
2657 }
2658
2659 #ifdef CONFIG_IWLWIFI_DEBUGFS
2660 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2661 {
2662         spin_lock_bh(&mvm->drv_stats_lock);
2663         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2664         spin_unlock_bh(&mvm->drv_stats_lock);
2665 }
2666
2667 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2668 {
2669         u8 nss = 0, mcs = 0;
2670
2671         spin_lock(&mvm->drv_stats_lock);
2672
2673         if (agg)
2674                 mvm->drv_rx_stats.agg_frames++;
2675
2676         mvm->drv_rx_stats.success_frames++;
2677
2678         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2679         case RATE_MCS_CHAN_WIDTH_20:
2680                 mvm->drv_rx_stats.bw_20_frames++;
2681                 break;
2682         case RATE_MCS_CHAN_WIDTH_40:
2683                 mvm->drv_rx_stats.bw_40_frames++;
2684                 break;
2685         case RATE_MCS_CHAN_WIDTH_80:
2686                 mvm->drv_rx_stats.bw_80_frames++;
2687                 break;
2688         default:
2689                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2690         }
2691
2692         if (rate & RATE_MCS_HT_MSK) {
2693                 mvm->drv_rx_stats.ht_frames++;
2694                 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2695                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2696         } else if (rate & RATE_MCS_VHT_MSK) {
2697                 mvm->drv_rx_stats.vht_frames++;
2698                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2699                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2700                        RATE_VHT_MCS_NSS_POS) + 1;
2701         } else {
2702                 mvm->drv_rx_stats.legacy_frames++;
2703         }
2704
2705         if (nss == 1)
2706                 mvm->drv_rx_stats.siso_frames++;
2707         else if (nss == 2)
2708                 mvm->drv_rx_stats.mimo2_frames++;
2709
2710         if (rate & RATE_MCS_SGI_MSK)
2711                 mvm->drv_rx_stats.sgi_frames++;
2712         else
2713                 mvm->drv_rx_stats.ngi_frames++;
2714
2715         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2716         mvm->drv_rx_stats.last_frame_idx =
2717                 (mvm->drv_rx_stats.last_frame_idx + 1) %
2718                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2719
2720         spin_unlock(&mvm->drv_stats_lock);
2721 }
2722 #endif
2723
2724 /*
2725  * Called after adding a new station to initialize rate scaling
2726  */
2727 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2728                           enum ieee80211_band band, bool init)
2729 {
2730         int i, j;
2731         struct ieee80211_hw *hw = mvm->hw;
2732         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2733         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2734         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2735         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2736         struct ieee80211_supported_band *sband;
2737         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2738
2739         /* clear all non-persistent lq data */
2740         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2741
2742         sband = hw->wiphy->bands[band];
2743
2744         lq_sta->lq.sta_id = sta_priv->sta_id;
2745
2746         for (j = 0; j < LQ_SIZE; j++)
2747                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2748
2749         lq_sta->flush_timer = 0;
2750         lq_sta->last_tx = jiffies;
2751
2752         IWL_DEBUG_RATE(mvm,
2753                        "LQ: *** rate scale station global init for station %d ***\n",
2754                        sta_priv->sta_id);
2755         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2756          * the lowest or the highest rate.. Could consider using RSSI from
2757          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2758          * after assoc.. */
2759
2760         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2761         lq_sta->band = sband->band;
2762         /*
2763          * active legacy rates as per supported rates bitmap
2764          */
2765         supp = sta->supp_rates[sband->band];
2766         lq_sta->active_legacy_rate = 0;
2767         for_each_set_bit(i, &supp, BITS_PER_LONG)
2768                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2769
2770         /* TODO: should probably account for rx_highest for both HT/VHT */
2771         if (!vht_cap || !vht_cap->vht_supported)
2772                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
2773         else
2774                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
2775
2776         if (IWL_MVM_RS_DISABLE_P2P_MIMO && sta_priv->vif->p2p)
2777                 lq_sta->active_mimo2_rate = 0;
2778
2779         lq_sta->max_legacy_rate_idx =
2780                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2781         lq_sta->max_siso_rate_idx =
2782                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2783         lq_sta->max_mimo2_rate_idx =
2784                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2785
2786         IWL_DEBUG_RATE(mvm,
2787                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2788                        lq_sta->active_legacy_rate,
2789                        lq_sta->active_siso_rate,
2790                        lq_sta->active_mimo2_rate,
2791                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
2792                        lq_sta->bfer_capable);
2793         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2794                        lq_sta->max_legacy_rate_idx,
2795                        lq_sta->max_siso_rate_idx,
2796                        lq_sta->max_mimo2_rate_idx);
2797
2798         /* These values will be overridden later */
2799         lq_sta->lq.single_stream_ant_msk =
2800                 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
2801         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2802
2803         /* as default allow aggregation for all tids */
2804         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2805         lq_sta->is_agg = 0;
2806 #ifdef CONFIG_IWLWIFI_DEBUGFS
2807         iwl_mvm_reset_frame_stats(mvm);
2808 #endif
2809         rs_initialize_lq(mvm, sta, lq_sta, band, init);
2810 }
2811
2812 static void rs_rate_update(void *mvm_r,
2813                            struct ieee80211_supported_band *sband,
2814                            struct cfg80211_chan_def *chandef,
2815                            struct ieee80211_sta *sta, void *priv_sta,
2816                            u32 changed)
2817 {
2818         u8 tid;
2819         struct iwl_op_mode *op_mode  =
2820                         (struct iwl_op_mode *)mvm_r;
2821         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2822
2823         /* Stop any ongoing aggregations as rs starts off assuming no agg */
2824         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2825                 ieee80211_stop_tx_ba_session(sta, tid);
2826
2827         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2828 }
2829
2830 #ifdef CONFIG_MAC80211_DEBUGFS
2831 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2832                                             struct iwl_lq_cmd *lq_cmd,
2833                                             enum ieee80211_band band,
2834                                             u32 ucode_rate)
2835 {
2836         struct rs_rate rate;
2837         int i;
2838         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2839         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2840         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2841
2842         for (i = 0; i < num_rates; i++)
2843                 lq_cmd->rs_table[i] = ucode_rate_le32;
2844
2845         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2846
2847         if (is_mimo(&rate))
2848                 lq_cmd->mimo_delim = num_rates - 1;
2849         else
2850                 lq_cmd->mimo_delim = 0;
2851
2852         lq_cmd->reduced_tpc = 0;
2853
2854         if (num_of_ant(ant) == 1)
2855                 lq_cmd->single_stream_ant_msk = ant;
2856
2857         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2858 }
2859 #endif /* CONFIG_MAC80211_DEBUGFS */
2860
2861 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2862                                      struct iwl_lq_sta *lq_sta,
2863                                      struct rs_rate *rate,
2864                                      __le32 *rs_table, int *rs_table_index,
2865                                      int num_rates, int num_retries,
2866                                      u8 valid_tx_ant, bool toggle_ant)
2867 {
2868         int i, j;
2869         __le32 ucode_rate;
2870         bool bottom_reached = false;
2871         int prev_rate_idx = rate->index;
2872         int end = LINK_QUAL_MAX_RETRY_NUM;
2873         int index = *rs_table_index;
2874
2875         for (i = 0; i < num_rates && index < end; i++) {
2876                 for (j = 0; j < num_retries && index < end; j++, index++) {
2877                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
2878                                                                          rate));
2879                         rs_table[index] = ucode_rate;
2880                         if (toggle_ant)
2881                                 rs_toggle_antenna(valid_tx_ant, rate);
2882                 }
2883
2884                 prev_rate_idx = rate->index;
2885                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2886                 if (bottom_reached && !is_legacy(rate))
2887                         break;
2888         }
2889
2890         if (!bottom_reached && !is_legacy(rate))
2891                 rate->index = prev_rate_idx;
2892
2893         *rs_table_index = index;
2894 }
2895
2896 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2897  * column the rate table should look like this:
2898  *
2899  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2900  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2901  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2902  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2903  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2904  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2905  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2906  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2907  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2908  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2909  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2910  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2911  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2912  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2913  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2914  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2915  */
2916 static void rs_build_rates_table(struct iwl_mvm *mvm,
2917                                  struct ieee80211_sta *sta,
2918                                  struct iwl_lq_sta *lq_sta,
2919                                  const struct rs_rate *initial_rate)
2920 {
2921         struct rs_rate rate;
2922         int num_rates, num_retries, index = 0;
2923         u8 valid_tx_ant = 0;
2924         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2925         bool toggle_ant = false;
2926
2927         memcpy(&rate, initial_rate, sizeof(rate));
2928
2929         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2930
2931         /* TODO: remove old API when min FW API hits 14 */
2932         if (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
2933             rs_stbc_allow(mvm, sta, lq_sta))
2934                 rate.stbc = true;
2935
2936         if (is_siso(&rate)) {
2937                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
2938                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
2939         } else if (is_mimo(&rate)) {
2940                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
2941                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
2942         } else {
2943                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
2944                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
2945                 toggle_ant = true;
2946         }
2947
2948         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2949                                  num_rates, num_retries, valid_tx_ant,
2950                                  toggle_ant);
2951
2952         rs_get_lower_rate_down_column(lq_sta, &rate);
2953
2954         if (is_siso(&rate)) {
2955                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
2956                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
2957                 lq_cmd->mimo_delim = index;
2958         } else if (is_legacy(&rate)) {
2959                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
2960                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
2961         } else {
2962                 WARN_ON_ONCE(1);
2963         }
2964
2965         toggle_ant = true;
2966
2967         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2968                                  num_rates, num_retries, valid_tx_ant,
2969                                  toggle_ant);
2970
2971         rs_get_lower_rate_down_column(lq_sta, &rate);
2972
2973         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
2974         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
2975
2976         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2977                                  num_rates, num_retries, valid_tx_ant,
2978                                  toggle_ant);
2979
2980 }
2981
2982 struct rs_bfer_active_iter_data {
2983         struct ieee80211_sta *exclude_sta;
2984         struct iwl_mvm_sta *bfer_mvmsta;
2985 };
2986
2987 static void rs_bfer_active_iter(void *_data,
2988                                 struct ieee80211_sta *sta)
2989 {
2990         struct rs_bfer_active_iter_data *data = _data;
2991         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2992         struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
2993         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
2994
2995         if (sta == data->exclude_sta)
2996                 return;
2997
2998         /* The current sta has BFER allowed */
2999         if (ss_params & LQ_SS_BFER_ALLOWED) {
3000                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3001
3002                 data->bfer_mvmsta = mvmsta;
3003         }
3004 }
3005
3006 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3007 {
3008         int prio = -1;
3009         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3010
3011         switch (viftype) {
3012         case NL80211_IFTYPE_AP:
3013         case NL80211_IFTYPE_P2P_GO:
3014                 prio = 3;
3015                 break;
3016         case NL80211_IFTYPE_P2P_CLIENT:
3017                 prio = 2;
3018                 break;
3019         case NL80211_IFTYPE_STATION:
3020                 prio = 1;
3021                 break;
3022         default:
3023                 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3024                 prio = -1;
3025         }
3026
3027         return prio;
3028 }
3029
3030 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3031 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3032                                 struct iwl_mvm_sta *sta2)
3033 {
3034         int prio1 = rs_bfer_priority(sta1);
3035         int prio2 = rs_bfer_priority(sta2);
3036
3037         if (prio1 > prio2)
3038                 return 1;
3039         if (prio1 < prio2)
3040                 return -1;
3041         return 0;
3042 }
3043
3044 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3045                                 struct ieee80211_sta *sta,
3046                                 struct iwl_lq_sta *lq_sta,
3047                                 const struct rs_rate *initial_rate)
3048 {
3049         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3050         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3051         struct rs_bfer_active_iter_data data = {
3052                 .exclude_sta = sta,
3053                 .bfer_mvmsta = NULL,
3054         };
3055         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3056         u32 ss_params = LQ_SS_PARAMS_VALID;
3057
3058         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3059                 goto out;
3060
3061         /* Check if forcing the decision is configured.
3062          * Note that SISO is forced by not allowing STBC or BFER
3063          */
3064         if (lq_sta->ss_force == RS_SS_FORCE_STBC)
3065                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3066         else if (lq_sta->ss_force == RS_SS_FORCE_BFER)
3067                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3068
3069         if (lq_sta->ss_force != RS_SS_FORCE_NONE) {
3070                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3071                                lq_sta->ss_force);
3072                 goto out;
3073         }
3074
3075         if (lq_sta->stbc_capable)
3076                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3077
3078         if (!lq_sta->bfer_capable)
3079                 goto out;
3080
3081         ieee80211_iterate_stations_atomic(mvm->hw,
3082                                           rs_bfer_active_iter,
3083                                           &data);
3084         bfer_mvmsta = data.bfer_mvmsta;
3085
3086         /* This code is safe as it doesn't run concurrently for different
3087          * stations. This is guaranteed by the fact that calls to
3088          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3089          */
3090         if (!bfer_mvmsta) {
3091                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3092
3093                 ss_params |= LQ_SS_BFER_ALLOWED;
3094                 goto out;
3095         }
3096
3097         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3098                        bfer_mvmsta->sta_id);
3099
3100         /* Disallow BFER on another STA if active and we're a higher priority */
3101         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3102                 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3103                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3104
3105                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3106                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3107                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3108
3109                 ss_params |= LQ_SS_BFER_ALLOWED;
3110                 IWL_DEBUG_RATE(mvm,
3111                                "Lower priority BFER sta found (%d). Switch BFER\n",
3112                                bfer_mvmsta->sta_id);
3113         }
3114 out:
3115         lq_cmd->ss_params = cpu_to_le32(ss_params);
3116 }
3117
3118 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3119                            struct ieee80211_sta *sta,
3120                            struct iwl_lq_sta *lq_sta,
3121                            const struct rs_rate *initial_rate)
3122 {
3123         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3124         struct iwl_mvm_sta *mvmsta;
3125         struct iwl_mvm_vif *mvmvif;
3126
3127         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3128         lq_cmd->agg_time_limit =
3129                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3130
3131 #ifdef CONFIG_MAC80211_DEBUGFS
3132         if (lq_sta->pers.dbg_fixed_rate) {
3133                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3134                                                 lq_sta->band,
3135                                                 lq_sta->pers.dbg_fixed_rate);
3136                 return;
3137         }
3138 #endif
3139         if (WARN_ON_ONCE(!sta || !initial_rate))
3140                 return;
3141
3142         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3143
3144         if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS)
3145                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3146
3147         if (num_of_ant(initial_rate->ant) == 1)
3148                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3149
3150         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3151         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3152
3153         if (num_of_ant(initial_rate->ant) == 1)
3154                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3155
3156         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3157
3158         /*
3159          * In case of low latency, tell the firwmare to leave a frame in the
3160          * Tx Fifo so that it can start a transaction in the same TxOP. This
3161          * basically allows the firmware to send bursts.
3162          */
3163         if (iwl_mvm_vif_low_latency(mvmvif)) {
3164                 lq_cmd->agg_frame_cnt_limit--;
3165
3166                 if (mvm->low_latency_agg_frame_limit)
3167                         lq_cmd->agg_frame_cnt_limit =
3168                                 min(lq_cmd->agg_frame_cnt_limit,
3169                                     mvm->low_latency_agg_frame_limit);
3170         }
3171
3172         if (mvmsta->vif->p2p)
3173                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3174
3175         lq_cmd->agg_time_limit =
3176                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3177 }
3178
3179 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3180 {
3181         return hw->priv;
3182 }
3183 /* rate scale requires free function to be implemented */
3184 static void rs_free(void *mvm_rate)
3185 {
3186         return;
3187 }
3188
3189 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3190                         void *mvm_sta)
3191 {
3192         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3193         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3194
3195         IWL_DEBUG_RATE(mvm, "enter\n");
3196         IWL_DEBUG_RATE(mvm, "leave\n");
3197 }
3198
3199 #ifdef CONFIG_MAC80211_DEBUGFS
3200 int rs_pretty_print_rate(char *buf, const u32 rate)
3201 {
3202
3203         char *type, *bw;
3204         u8 mcs = 0, nss = 0;
3205         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3206
3207         if (!(rate & RATE_MCS_HT_MSK) &&
3208             !(rate & RATE_MCS_VHT_MSK)) {
3209                 int index = iwl_hwrate_to_plcp_idx(rate);
3210
3211                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3212                                rs_pretty_ant(ant),
3213                                index == IWL_RATE_INVALID ? "BAD" :
3214                                iwl_rate_mcs[index].mbps);
3215         }
3216
3217         if (rate & RATE_MCS_VHT_MSK) {
3218                 type = "VHT";
3219                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3220                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3221                        >> RATE_VHT_MCS_NSS_POS) + 1;
3222         } else if (rate & RATE_MCS_HT_MSK) {
3223                 type = "HT";
3224                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3225         } else {
3226                 type = "Unknown"; /* shouldn't happen */
3227         }
3228
3229         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3230         case RATE_MCS_CHAN_WIDTH_20:
3231                 bw = "20Mhz";
3232                 break;
3233         case RATE_MCS_CHAN_WIDTH_40:
3234                 bw = "40Mhz";
3235                 break;
3236         case RATE_MCS_CHAN_WIDTH_80:
3237                 bw = "80Mhz";
3238                 break;
3239         case RATE_MCS_CHAN_WIDTH_160:
3240                 bw = "160Mhz";
3241                 break;
3242         default:
3243                 bw = "BAD BW";
3244         }
3245
3246         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3247                        type, rs_pretty_ant(ant), bw, mcs, nss,
3248                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3249                        (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3250                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3251                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3252                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3253 }
3254
3255 /**
3256  * Program the device to use fixed rate for frame transmit
3257  * This is for debugging/testing only
3258  * once the device start use fixed rate, we need to reload the module
3259  * to being back the normal operation.
3260  */
3261 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3262                                 struct iwl_lq_sta *lq_sta)
3263 {
3264         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3265         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3266         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3267
3268         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3269                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3270
3271         if (lq_sta->pers.dbg_fixed_rate) {
3272                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3273                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3274         }
3275 }
3276
3277 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3278                         const char __user *user_buf, size_t count, loff_t *ppos)
3279 {
3280         struct iwl_lq_sta *lq_sta = file->private_data;
3281         struct iwl_mvm *mvm;
3282         char buf[64];
3283         size_t buf_size;
3284         u32 parsed_rate;
3285
3286         mvm = lq_sta->pers.drv;
3287         memset(buf, 0, sizeof(buf));
3288         buf_size = min(count, sizeof(buf) -  1);
3289         if (copy_from_user(buf, user_buf, buf_size))
3290                 return -EFAULT;
3291
3292         if (sscanf(buf, "%x", &parsed_rate) == 1)
3293                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3294         else
3295                 lq_sta->pers.dbg_fixed_rate = 0;
3296
3297         rs_program_fix_rate(mvm, lq_sta);
3298
3299         return count;
3300 }
3301
3302 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3303                         char __user *user_buf, size_t count, loff_t *ppos)
3304 {
3305         char *buff;
3306         int desc = 0;
3307         int i = 0;
3308         ssize_t ret;
3309
3310         struct iwl_lq_sta *lq_sta = file->private_data;
3311         struct iwl_mvm *mvm;
3312         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3313         struct rs_rate *rate = &tbl->rate;
3314         mvm = lq_sta->pers.drv;
3315         buff = kmalloc(2048, GFP_KERNEL);
3316         if (!buff)
3317                 return -ENOMEM;
3318
3319         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3320         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3321                         lq_sta->total_failed, lq_sta->total_success,
3322                         lq_sta->active_legacy_rate);
3323         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3324                         lq_sta->pers.dbg_fixed_rate);
3325         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3326             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3327             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3328             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3329         desc += sprintf(buff+desc, "lq type %s\n",
3330                         (is_legacy(rate)) ? "legacy" :
3331                         is_vht(rate) ? "VHT" : "HT");
3332         if (!is_legacy(rate)) {
3333                 desc += sprintf(buff+desc, " %s",
3334                    (is_siso(rate)) ? "SISO" : "MIMO2");
3335                    desc += sprintf(buff+desc, " %s",
3336                                    (is_ht20(rate)) ? "20MHz" :
3337                                    (is_ht40(rate)) ? "40MHz" :
3338                                    (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3339                    desc += sprintf(buff+desc, " %s %s %s\n",
3340                                    (rate->sgi) ? "SGI" : "NGI",
3341                                    (rate->ldpc) ? "LDPC" : "BCC",
3342                                    (lq_sta->is_agg) ? "AGG on" : "");
3343         }
3344         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3345                         lq_sta->last_rate_n_flags);
3346         desc += sprintf(buff+desc,
3347                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3348                         lq_sta->lq.flags,
3349                         lq_sta->lq.mimo_delim,
3350                         lq_sta->lq.single_stream_ant_msk,
3351                         lq_sta->lq.dual_stream_ant_msk);
3352
3353         desc += sprintf(buff+desc,
3354                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3355                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3356                         lq_sta->lq.agg_disable_start_th,
3357                         lq_sta->lq.agg_frame_cnt_limit);
3358
3359         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3360         desc += sprintf(buff+desc,
3361                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3362                         lq_sta->lq.initial_rate_index[0],
3363                         lq_sta->lq.initial_rate_index[1],
3364                         lq_sta->lq.initial_rate_index[2],
3365                         lq_sta->lq.initial_rate_index[3]);
3366
3367         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3368                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3369
3370                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3371                 desc += rs_pretty_print_rate(buff+desc, r);
3372         }
3373
3374         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3375         kfree(buff);
3376         return ret;
3377 }
3378
3379 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3380         .write = rs_sta_dbgfs_scale_table_write,
3381         .read = rs_sta_dbgfs_scale_table_read,
3382         .open = simple_open,
3383         .llseek = default_llseek,
3384 };
3385 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3386                         char __user *user_buf, size_t count, loff_t *ppos)
3387 {
3388         char *buff;
3389         int desc = 0;
3390         int i, j;
3391         ssize_t ret;
3392         struct iwl_scale_tbl_info *tbl;
3393         struct rs_rate *rate;
3394         struct iwl_lq_sta *lq_sta = file->private_data;
3395
3396         buff = kmalloc(1024, GFP_KERNEL);
3397         if (!buff)
3398                 return -ENOMEM;
3399
3400         for (i = 0; i < LQ_SIZE; i++) {
3401                 tbl = &(lq_sta->lq_info[i]);
3402                 rate = &tbl->rate;
3403                 desc += sprintf(buff+desc,
3404                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3405                                 "index=%d\n",
3406                                 lq_sta->active_tbl == i ? "*" : "x",
3407                                 rate->type,
3408                                 rate->sgi,
3409                                 is_ht20(rate) ? "20Mhz" :
3410                                 is_ht40(rate) ? "40Mhz" :
3411                                 is_ht80(rate) ? "80Mhz" : "ERR",
3412                                 rate->index);
3413                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3414                         desc += sprintf(buff+desc,
3415                                 "counter=%d success=%d %%=%d\n",
3416                                 tbl->win[j].counter,
3417                                 tbl->win[j].success_counter,
3418                                 tbl->win[j].success_ratio);
3419                 }
3420         }
3421         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3422         kfree(buff);
3423         return ret;
3424 }
3425
3426 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3427         .read = rs_sta_dbgfs_stats_table_read,
3428         .open = simple_open,
3429         .llseek = default_llseek,
3430 };
3431
3432 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3433                                               char __user *user_buf,
3434                                               size_t count, loff_t *ppos)
3435 {
3436         static const char * const column_name[] = {
3437                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3438                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3439                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3440                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3441                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3442                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3443                 [RS_COLUMN_MIMO2] = "MIMO2",
3444                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3445         };
3446
3447         static const char * const rate_name[] = {
3448                 [IWL_RATE_1M_INDEX] = "1M",
3449                 [IWL_RATE_2M_INDEX] = "2M",
3450                 [IWL_RATE_5M_INDEX] = "5.5M",
3451                 [IWL_RATE_11M_INDEX] = "11M",
3452                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3453                 [IWL_RATE_9M_INDEX] = "9M",
3454                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3455                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3456                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3457                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3458                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3459                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3460                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3461                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3462                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3463         };
3464
3465         char *buff, *pos, *endpos;
3466         int col, rate;
3467         ssize_t ret;
3468         struct iwl_lq_sta *lq_sta = file->private_data;
3469         struct rs_rate_stats *stats;
3470         static const size_t bufsz = 1024;
3471
3472         buff = kmalloc(bufsz, GFP_KERNEL);
3473         if (!buff)
3474                 return -ENOMEM;
3475
3476         pos = buff;
3477         endpos = pos + bufsz;
3478
3479         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3480         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3481                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3482         pos += scnprintf(pos, endpos - pos, "\n");
3483
3484         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3485                 pos += scnprintf(pos, endpos - pos,
3486                                  "%s,", column_name[col]);
3487
3488                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3489                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3490                         pos += scnprintf(pos, endpos - pos,
3491                                          "%llu/%llu,",
3492                                          stats->success,
3493                                          stats->total);
3494                 }
3495                 pos += scnprintf(pos, endpos - pos, "\n");
3496         }
3497
3498         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3499         kfree(buff);
3500         return ret;
3501 }
3502
3503 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3504                                                const char __user *user_buf,
3505                                                size_t count, loff_t *ppos)
3506 {
3507         struct iwl_lq_sta *lq_sta = file->private_data;
3508         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3509
3510         return count;
3511 }
3512
3513 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3514         .read = rs_sta_dbgfs_drv_tx_stats_read,
3515         .write = rs_sta_dbgfs_drv_tx_stats_write,
3516         .open = simple_open,
3517         .llseek = default_llseek,
3518 };
3519
3520 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3521                                        char __user *user_buf,
3522                                        size_t count, loff_t *ppos)
3523 {
3524         struct iwl_lq_sta *lq_sta = file->private_data;
3525         char buf[12];
3526         int bufsz = sizeof(buf);
3527         int pos = 0;
3528         static const char * const ss_force_name[] = {
3529                 [RS_SS_FORCE_NONE] = "none",
3530                 [RS_SS_FORCE_STBC] = "stbc",
3531                 [RS_SS_FORCE_BFER] = "bfer",
3532                 [RS_SS_FORCE_SISO] = "siso",
3533         };
3534
3535         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3536                          ss_force_name[lq_sta->ss_force]);
3537         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3538 }
3539
3540 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3541                                         size_t count, loff_t *ppos)
3542 {
3543         struct iwl_mvm *mvm = lq_sta->pers.drv;
3544         int ret = 0;
3545
3546         if (!strncmp("none", buf, 4)) {
3547                 lq_sta->ss_force = RS_SS_FORCE_NONE;
3548         } else if (!strncmp("siso", buf, 4)) {
3549                 lq_sta->ss_force = RS_SS_FORCE_SISO;
3550         } else if (!strncmp("stbc", buf, 4)) {
3551                 if (lq_sta->stbc_capable) {
3552                         lq_sta->ss_force = RS_SS_FORCE_STBC;
3553                 } else {
3554                         IWL_ERR(mvm,
3555                                 "can't force STBC. peer doesn't support\n");
3556                         ret = -EINVAL;
3557                 }
3558         } else if (!strncmp("bfer", buf, 4)) {
3559                 if (lq_sta->bfer_capable) {
3560                         lq_sta->ss_force = RS_SS_FORCE_BFER;
3561                 } else {
3562                         IWL_ERR(mvm,
3563                                 "can't force BFER. peer doesn't support\n");
3564                         ret = -EINVAL;
3565                 }
3566         } else {
3567                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3568                 ret = -EINVAL;
3569         }
3570         return ret ?: count;
3571 }
3572
3573 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3574         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3575 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
3576                 if (!debugfs_create_file(#name, mode, parent, lq_sta,   \
3577                                          &iwl_dbgfs_##name##_ops))      \
3578                         goto err;                                       \
3579         } while (0)
3580
3581 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3582
3583 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3584 {
3585         struct iwl_lq_sta *lq_sta = mvm_sta;
3586
3587         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3588                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
3589         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3590                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
3591         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3592                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3593         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3594                           &lq_sta->tx_agg_tid_en);
3595         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3596                           &lq_sta->pers.dbg_fixed_txp_reduction);
3597
3598         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3599         return;
3600 err:
3601         IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3602 }
3603
3604 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3605 {
3606 }
3607 #endif
3608
3609 /*
3610  * Initialization of rate scaling information is done by driver after
3611  * the station is added. Since mac80211 calls this function before a
3612  * station is added we ignore it.
3613  */
3614 static void rs_rate_init_stub(void *mvm_r,
3615                               struct ieee80211_supported_band *sband,
3616                               struct cfg80211_chan_def *chandef,
3617                               struct ieee80211_sta *sta, void *mvm_sta)
3618 {
3619 }
3620
3621 static const struct rate_control_ops rs_mvm_ops = {
3622         .name = RS_NAME,
3623         .tx_status = rs_mac80211_tx_status,
3624         .get_rate = rs_get_rate,
3625         .rate_init = rs_rate_init_stub,
3626         .alloc = rs_alloc,
3627         .free = rs_free,
3628         .alloc_sta = rs_alloc_sta,
3629         .free_sta = rs_free_sta,
3630         .rate_update = rs_rate_update,
3631 #ifdef CONFIG_MAC80211_DEBUGFS
3632         .add_sta_debugfs = rs_add_debugfs,
3633         .remove_sta_debugfs = rs_remove_debugfs,
3634 #endif
3635 };
3636
3637 int iwl_mvm_rate_control_register(void)
3638 {
3639         return ieee80211_rate_control_register(&rs_mvm_ops);
3640 }
3641
3642 void iwl_mvm_rate_control_unregister(void)
3643 {
3644         ieee80211_rate_control_unregister(&rs_mvm_ops);
3645 }
3646
3647 /**
3648  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3649  * Tx protection, according to this rquest and previous requests,
3650  * and send the LQ command.
3651  * @mvmsta: The station
3652  * @enable: Enable Tx protection?
3653  */
3654 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3655                           bool enable)
3656 {
3657         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3658
3659         lockdep_assert_held(&mvm->mutex);
3660
3661         if (enable) {
3662                 if (mvmsta->tx_protection == 0)
3663                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
3664                 mvmsta->tx_protection++;
3665         } else {
3666                 mvmsta->tx_protection--;
3667                 if (mvmsta->tx_protection == 0)
3668                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3669         }
3670
3671         return iwl_mvm_send_lq_cmd(mvm, lq, false);
3672 }