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
  43 #define RS_NAME "iwl-mvm-rs"
  44
  45 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  46
  47 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
  48  * Use this macro when dealing with thresholds consts set as a percentage
  49  */
  50 #define RS_PERCENT(x) (128 * x)
  51
  52 static u8 rs_ht_to_legacy[] = {
  53         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  54         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  55         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  56         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  57         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  58         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  59         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  60         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  61         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  62         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  63 };
  64
  65 static const u8 ant_toggle_lookup[] = {
  66         [ANT_NONE] = ANT_NONE,
  67         [ANT_A] = ANT_B,
  68         [ANT_B] = ANT_C,
  69         [ANT_AB] = ANT_BC,
  70         [ANT_C] = ANT_A,
  71         [ANT_AC] = ANT_AB,
  72         [ANT_BC] = ANT_AC,
  73         [ANT_ABC] = ANT_ABC,
  74 };
  75
  76 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  77         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  78                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  79                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  80                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  81                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  82                                     IWL_RATE_##rp##M_INDEX,           \
  83                                     IWL_RATE_##rn##M_INDEX }
  84
  85 #define IWL_DECLARE_MCS_RATE(s)                                           \
  86         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
  87                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
  88                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
  89                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
  90                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
  91                                        IWL_RATE_INVM_INDEX,               \
  92                                        IWL_RATE_INVM_INDEX }
  93
  94 /*
  95  * Parameter order:
  96  *   rate, ht rate, prev rate, next rate
  97  *
  98  * If there isn't a valid next or previous rate then INV is used which
  99  * maps to IWL_RATE_INVALID
 100  *
 101  */
 102 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 103         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 104         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 105         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 106         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 107         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 108         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 109         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 110         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 111         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 112         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 113         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 114         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 115         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 116         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 117         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 118 };
 119
 120 enum rs_action {
 121         RS_ACTION_STAY = 0,
 122         RS_ACTION_DOWNSCALE = -1,
 123         RS_ACTION_UPSCALE = 1,
 124 };
 125
 126 enum rs_column_mode {
 127         RS_INVALID = 0,
 128         RS_LEGACY,
 129         RS_SISO,
 130         RS_MIMO2,
 131 };
 132
 133 #define MAX_NEXT_COLUMNS 7
 134 #define MAX_COLUMN_CHECKS 3
 135
 136 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 137                                      struct ieee80211_sta *sta,
 138                                      struct iwl_scale_tbl_info *tbl);
 139
 140 struct rs_tx_column {
 141         enum rs_column_mode mode;
 142         u8 ant;
 143         bool sgi;
 144         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 145         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 146 };
 147
 148 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 149                          struct iwl_scale_tbl_info *tbl)
 150 {
 151         return iwl_mvm_bt_coex_is_ant_avail(mvm, tbl->rate.ant);
 152 }
 153
 154 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 155                           struct iwl_scale_tbl_info *tbl)
 156 {
 157         if (!sta->ht_cap.ht_supported)
 158                 return false;
 159
 160         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 161                 return false;
 162
 163         if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
 164                 return false;
 165
 166         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 167                 return false;
 168
 169         return true;
 170 }
 171
 172 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 173                           struct iwl_scale_tbl_info *tbl)
 174 {
 175         if (!sta->ht_cap.ht_supported)
 176                 return false;
 177
 178         return true;
 179 }
 180
 181 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 182                          struct iwl_scale_tbl_info *tbl)
 183 {
 184         struct rs_rate *rate = &tbl->rate;
 185         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 186         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 187
 188         if (is_ht20(rate) && (ht_cap->cap &
 189                              IEEE80211_HT_CAP_SGI_20))
 190                 return true;
 191         if (is_ht40(rate) && (ht_cap->cap &
 192                              IEEE80211_HT_CAP_SGI_40))
 193                 return true;
 194         if (is_ht80(rate) && (vht_cap->cap &
 195                              IEEE80211_VHT_CAP_SHORT_GI_80))
 196                 return true;
 197
 198         return false;
 199 }
 200
 201 static const struct rs_tx_column rs_tx_columns[] = {
 202         [RS_COLUMN_LEGACY_ANT_A] = {
 203                 .mode = RS_LEGACY,
 204                 .ant = ANT_A,
 205                 .next_columns = {
 206                         RS_COLUMN_LEGACY_ANT_B,
 207                         RS_COLUMN_SISO_ANT_A,
 208                         RS_COLUMN_MIMO2,
 209                         RS_COLUMN_INVALID,
 210                         RS_COLUMN_INVALID,
 211                         RS_COLUMN_INVALID,
 212                         RS_COLUMN_INVALID,
 213                 },
 214                 .checks = {
 215                         rs_ant_allow,
 216                 },
 217         },
 218         [RS_COLUMN_LEGACY_ANT_B] = {
 219                 .mode = RS_LEGACY,
 220                 .ant = ANT_B,
 221                 .next_columns = {
 222                         RS_COLUMN_LEGACY_ANT_A,
 223                         RS_COLUMN_SISO_ANT_B,
 224                         RS_COLUMN_MIMO2,
 225                         RS_COLUMN_INVALID,
 226                         RS_COLUMN_INVALID,
 227                         RS_COLUMN_INVALID,
 228                         RS_COLUMN_INVALID,
 229                 },
 230                 .checks = {
 231                         rs_ant_allow,
 232                 },
 233         },
 234         [RS_COLUMN_SISO_ANT_A] = {
 235                 .mode = RS_SISO,
 236                 .ant = ANT_A,
 237                 .next_columns = {
 238                         RS_COLUMN_SISO_ANT_B,
 239                         RS_COLUMN_MIMO2,
 240                         RS_COLUMN_SISO_ANT_A_SGI,
 241                         RS_COLUMN_LEGACY_ANT_A,
 242                         RS_COLUMN_LEGACY_ANT_B,
 243                         RS_COLUMN_INVALID,
 244                         RS_COLUMN_INVALID,
 245                 },
 246                 .checks = {
 247                         rs_siso_allow,
 248                         rs_ant_allow,
 249                 },
 250         },
 251         [RS_COLUMN_SISO_ANT_B] = {
 252                 .mode = RS_SISO,
 253                 .ant = ANT_B,
 254                 .next_columns = {
 255                         RS_COLUMN_SISO_ANT_A,
 256                         RS_COLUMN_MIMO2,
 257                         RS_COLUMN_SISO_ANT_B_SGI,
 258                         RS_COLUMN_LEGACY_ANT_A,
 259                         RS_COLUMN_LEGACY_ANT_B,
 260                         RS_COLUMN_INVALID,
 261                         RS_COLUMN_INVALID,
 262                 },
 263                 .checks = {
 264                         rs_siso_allow,
 265                         rs_ant_allow,
 266                 },
 267         },
 268         [RS_COLUMN_SISO_ANT_A_SGI] = {
 269                 .mode = RS_SISO,
 270                 .ant = ANT_A,
 271                 .sgi = true,
 272                 .next_columns = {
 273                         RS_COLUMN_SISO_ANT_B_SGI,
 274                         RS_COLUMN_MIMO2_SGI,
 275                         RS_COLUMN_SISO_ANT_A,
 276                         RS_COLUMN_LEGACY_ANT_A,
 277                         RS_COLUMN_LEGACY_ANT_B,
 278                         RS_COLUMN_INVALID,
 279                         RS_COLUMN_INVALID,
 280                 },
 281                 .checks = {
 282                         rs_siso_allow,
 283                         rs_ant_allow,
 284                         rs_sgi_allow,
 285                 },
 286         },
 287         [RS_COLUMN_SISO_ANT_B_SGI] = {
 288                 .mode = RS_SISO,
 289                 .ant = ANT_B,
 290                 .sgi = true,
 291                 .next_columns = {
 292                         RS_COLUMN_SISO_ANT_A_SGI,
 293                         RS_COLUMN_MIMO2_SGI,
 294                         RS_COLUMN_SISO_ANT_B,
 295                         RS_COLUMN_LEGACY_ANT_A,
 296                         RS_COLUMN_LEGACY_ANT_B,
 297                         RS_COLUMN_INVALID,
 298                         RS_COLUMN_INVALID,
 299                 },
 300                 .checks = {
 301                         rs_siso_allow,
 302                         rs_ant_allow,
 303                         rs_sgi_allow,
 304                 },
 305         },
 306         [RS_COLUMN_MIMO2] = {
 307                 .mode = RS_MIMO2,
 308                 .ant = ANT_AB,
 309                 .next_columns = {
 310                         RS_COLUMN_SISO_ANT_A,
 311                         RS_COLUMN_MIMO2_SGI,
 312                         RS_COLUMN_LEGACY_ANT_A,
 313                         RS_COLUMN_LEGACY_ANT_B,
 314                         RS_COLUMN_INVALID,
 315                         RS_COLUMN_INVALID,
 316                         RS_COLUMN_INVALID,
 317                 },
 318                 .checks = {
 319                         rs_mimo_allow,
 320                 },
 321         },
 322         [RS_COLUMN_MIMO2_SGI] = {
 323                 .mode = RS_MIMO2,
 324                 .ant = ANT_AB,
 325                 .sgi = true,
 326                 .next_columns = {
 327                         RS_COLUMN_SISO_ANT_A_SGI,
 328                         RS_COLUMN_MIMO2,
 329                         RS_COLUMN_LEGACY_ANT_A,
 330                         RS_COLUMN_LEGACY_ANT_B,
 331                         RS_COLUMN_INVALID,
 332                         RS_COLUMN_INVALID,
 333                         RS_COLUMN_INVALID,
 334                 },
 335                 .checks = {
 336                         rs_mimo_allow,
 337                         rs_sgi_allow,
 338                 },
 339         },
 340 };
 341
 342 static inline u8 rs_extract_rate(u32 rate_n_flags)
 343 {
 344         /* also works for HT because bits 7:6 are zero there */
 345         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 346 }
 347
 348 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 349 {
 350         int idx = 0;
 351
 352         if (rate_n_flags & RATE_MCS_HT_MSK) {
 353                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 354                 idx += IWL_RATE_MCS_0_INDEX;
 355
 356                 /* skip 9M not supported in HT*/
 357                 if (idx >= IWL_RATE_9M_INDEX)
 358                         idx += 1;
 359                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 360                         return idx;
 361         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 362                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 363                 idx += IWL_RATE_MCS_0_INDEX;
 364
 365                 /* skip 9M not supported in VHT*/
 366                 if (idx >= IWL_RATE_9M_INDEX)
 367                         idx++;
 368                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 369                         return idx;
 370         } else {
 371                 /* legacy rate format, search for match in table */
 372
 373                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 374                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 375                         if (iwl_rates[idx].plcp == legacy_rate)
 376                                 return idx;
 377         }
 378
 379         return IWL_RATE_INVALID;
 380 }
 381
 382 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 383                                   struct ieee80211_sta *sta,
 384                                   struct iwl_lq_sta *lq_sta,
 385                                   int tid);
 386 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 387                            struct ieee80211_sta *sta,
 388                            struct iwl_lq_sta *lq_sta,
 389                            const struct rs_rate *initial_rate);
 390 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 391
 392 /**
 393  * The following tables contain the expected throughput metrics for all rates
 394  *
 395  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 396  *
 397  * where invalid entries are zeros.
 398  *
 399  * CCK rates are only valid in legacy table and will only be used in G
 400  * (2.4 GHz) band.
 401  */
 402
 403 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 404         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 405 };
 406
 407 /* Expected TpT tables. 4 indexes:
 408  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 409  */
 410 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 411         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 412         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 413         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 414         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 415 };
 416
 417 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 418         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 419         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 420         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 421         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 422 };
 423
 424 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 425         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 426         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 427         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 428         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 429 };
 430
 431 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 432         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 433         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 434         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 435         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 436 };
 437
 438 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 439         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 440         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 441         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 442         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 443 };
 444
 445 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 446         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 447         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 448         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 449         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 450 };
 451
 452 /* mbps, mcs */
 453 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 454         {  "1", "BPSK DSSS"},
 455         {  "2", "QPSK DSSS"},
 456         {"5.5", "BPSK CCK"},
 457         { "11", "QPSK CCK"},
 458         {  "6", "BPSK 1/2"},
 459         {  "9", "BPSK 1/2"},
 460         { "12", "QPSK 1/2"},
 461         { "18", "QPSK 3/4"},
 462         { "24", "16QAM 1/2"},
 463         { "36", "16QAM 3/4"},
 464         { "48", "64QAM 2/3"},
 465         { "54", "64QAM 3/4"},
 466         { "60", "64QAM 5/6"},
 467 };
 468
 469 #define MCS_INDEX_PER_STREAM    (8)
 470
 471 static const char *rs_pretty_ant(u8 ant)
 472 {
 473         static const char * const ant_name[] = {
 474                 [ANT_NONE] = "None",
 475                 [ANT_A]    = "A",
 476                 [ANT_B]    = "B",
 477                 [ANT_AB]   = "AB",
 478                 [ANT_C]    = "C",
 479                 [ANT_AC]   = "AC",
 480                 [ANT_BC]   = "BC",
 481                 [ANT_ABC]  = "ABC",
 482         };
 483
 484         if (ant > ANT_ABC)
 485                 return "UNKNOWN";
 486
 487         return ant_name[ant];
 488 }
 489
 490 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 491 {
 492         static const char * const lq_types[] = {
 493                 [LQ_NONE] = "NONE",
 494                 [LQ_LEGACY_A] = "LEGACY_A",
 495                 [LQ_LEGACY_G] = "LEGACY_G",
 496                 [LQ_HT_SISO] = "HT SISO",
 497                 [LQ_HT_MIMO2] = "HT MIMO",
 498                 [LQ_VHT_SISO] = "VHT SISO",
 499                 [LQ_VHT_MIMO2] = "VHT MIMO",
 500         };
 501
 502         if (type < LQ_NONE || type >= LQ_MAX)
 503                 return "UNKNOWN";
 504
 505         return lq_types[type];
 506 }
 507
 508 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 509                                 const char *prefix)
 510 {
 511         IWL_DEBUG_RATE(mvm,
 512                        "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
 513                        prefix, rs_pretty_lq_type(rate->type),
 514                        rate->index, rs_pretty_ant(rate->ant),
 515                        rate->bw, rate->sgi, rate->ldpc, rate->stbc);
 516 }
 517
 518 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 519 {
 520         window->data = 0;
 521         window->success_counter = 0;
 522         window->success_ratio = IWL_INVALID_VALUE;
 523         window->counter = 0;
 524         window->average_tpt = IWL_INVALID_VALUE;
 525 }
 526
 527 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 528                                             struct iwl_scale_tbl_info *tbl)
 529 {
 530         int i;
 531
 532         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 533         for (i = 0; i < IWL_RATE_COUNT; i++)
 534                 rs_rate_scale_clear_window(&tbl->win[i]);
 535
 536         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 537                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 538 }
 539
 540 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 541 {
 542         return (ant_type & valid_antenna) == ant_type;
 543 }
 544
 545 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 546                                       struct iwl_lq_sta *lq_data, u8 tid,
 547                                       struct ieee80211_sta *sta)
 548 {
 549         int ret = -EAGAIN;
 550
 551         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 552                      sta->addr, tid);
 553         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 554         if (ret == -EAGAIN) {
 555                 /*
 556                  * driver and mac80211 is out of sync
 557                  * this might be cause by reloading firmware
 558                  * stop the tx ba session here
 559                  */
 560                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 561                         tid);
 562                 ieee80211_stop_tx_ba_session(sta, tid);
 563         }
 564         return ret;
 565 }
 566
 567 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 568                               struct iwl_lq_sta *lq_data,
 569                               struct ieee80211_sta *sta)
 570 {
 571         if (tid < IWL_MAX_TID_COUNT)
 572                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 573         else
 574                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 575                         tid, IWL_MAX_TID_COUNT);
 576 }
 577
 578 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 579 {
 580         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 581                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 582                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 583 }
 584
 585 /*
 586  * Static function to get the expected throughput from an iwl_scale_tbl_info
 587  * that wraps a NULL pointer check
 588  */
 589 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 590 {
 591         if (tbl->expected_tpt)
 592                 return tbl->expected_tpt[rs_index];
 593         return 0;
 594 }
 595
 596 /**
 597  * rs_collect_tx_data - Update the success/failure sliding window
 598  *
 599  * We keep a sliding window of the last 62 packets transmitted
 600  * at this rate.  window->data contains the bitmask of successful
 601  * packets.
 602  */
 603 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
 604                                struct iwl_scale_tbl_info *tbl,
 605                                int scale_index, int attempts, int successes,
 606                                struct iwl_rate_scale_data *window)
 607 {
 608         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 609         s32 fail_count, tpt;
 610
 611         /* Get expected throughput */
 612         tpt = get_expected_tpt(tbl, scale_index);
 613
 614         /*
 615          * Keep track of only the latest 62 tx frame attempts in this rate's
 616          * history window; anything older isn't really relevant any more.
 617          * If we have filled up the sliding window, drop the oldest attempt;
 618          * if the oldest attempt (highest bit in bitmap) shows "success",
 619          * subtract "1" from the success counter (this is the main reason
 620          * we keep these bitmaps!).
 621          */
 622         while (attempts > 0) {
 623                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 624                         /* remove earliest */
 625                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 626
 627                         if (window->data & mask) {
 628                                 window->data &= ~mask;
 629                                 window->success_counter--;
 630                         }
 631                 }
 632
 633                 /* Increment frames-attempted counter */
 634                 window->counter++;
 635
 636                 /* Shift bitmap by one frame to throw away oldest history */
 637                 window->data <<= 1;
 638
 639                 /* Mark the most recent #successes attempts as successful */
 640                 if (successes > 0) {
 641                         window->success_counter++;
 642                         window->data |= 0x1;
 643                         successes--;
 644                 }
 645
 646                 attempts--;
 647         }
 648
 649         /* Calculate current success ratio, avoid divide-by-0! */
 650         if (window->counter > 0)
 651                 window->success_ratio = 128 * (100 * window->success_counter)
 652                                         / window->counter;
 653         else
 654                 window->success_ratio = IWL_INVALID_VALUE;
 655
 656         fail_count = window->counter - window->success_counter;
 657
 658         /* Calculate average throughput, if we have enough history. */
 659         if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
 660             (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
 661                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 662         else
 663                 window->average_tpt = IWL_INVALID_VALUE;
 664
 665         return 0;
 666 }
 667
 668 static int rs_collect_tx_data(struct iwl_mvm *mvm,
 669                               struct iwl_lq_sta *lq_sta,
 670                               struct iwl_scale_tbl_info *tbl,
 671                               int scale_index, int attempts, int successes,
 672                               u8 reduced_txp)
 673 {
 674         struct iwl_rate_scale_data *window = NULL;
 675         int ret;
 676
 677         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 678                 return -EINVAL;
 679
 680         if (tbl->column != RS_COLUMN_INVALID) {
 681                 struct lq_sta_pers *pers = &lq_sta->pers;
 682
 683                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 684                 pers->tx_stats[tbl->column][scale_index].success += successes;
 685         }
 686
 687         /* Select window for current tx bit rate */
 688         window = &(tbl->win[scale_index]);
 689
 690         ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 691                                   window);
 692         if (ret)
 693                 return ret;
 694
 695         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 696                 return -EINVAL;
 697
 698         window = &tbl->tpc_win[reduced_txp];
 699         return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 700                                    window);
 701 }
 702
 703 /* Convert rs_rate object into ucode rate bitmask */
 704 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 705                                   struct rs_rate *rate)
 706 {
 707         u32 ucode_rate = 0;
 708         int index = rate->index;
 709
 710         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 711                          RATE_MCS_ANT_ABC_MSK);
 712
 713         if (is_legacy(rate)) {
 714                 ucode_rate |= iwl_rates[index].plcp;
 715                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 716                         ucode_rate |= RATE_MCS_CCK_MSK;
 717                 return ucode_rate;
 718         }
 719
 720         if (is_ht(rate)) {
 721                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 722                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 723                         index = IWL_LAST_HT_RATE;
 724                 }
 725                 ucode_rate |= RATE_MCS_HT_MSK;
 726
 727                 if (is_ht_siso(rate))
 728                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 729                 else if (is_ht_mimo2(rate))
 730                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 731                 else
 732                         WARN_ON_ONCE(1);
 733         } else if (is_vht(rate)) {
 734                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 735                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 736                         index = IWL_LAST_VHT_RATE;
 737                 }
 738                 ucode_rate |= RATE_MCS_VHT_MSK;
 739                 if (is_vht_siso(rate))
 740                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 741                 else if (is_vht_mimo2(rate))
 742                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 743                 else
 744                         WARN_ON_ONCE(1);
 745
 746         } else {
 747                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 748         }
 749
 750         if (is_siso(rate) && rate->stbc) {
 751                 /* To enable STBC we need to set both a flag and ANT_AB */
 752                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 753                 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
 754         }
 755
 756         ucode_rate |= rate->bw;
 757         if (rate->sgi)
 758                 ucode_rate |= RATE_MCS_SGI_MSK;
 759         if (rate->ldpc)
 760                 ucode_rate |= RATE_MCS_LDPC_MSK;
 761
 762         return ucode_rate;
 763 }
 764
 765 /* Convert a ucode rate into an rs_rate object */
 766 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 767                                    enum ieee80211_band band,
 768                                    struct rs_rate *rate)
 769 {
 770         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 771         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 772         u8 nss;
 773
 774         memset(rate, 0, sizeof(*rate));
 775         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 776
 777         if (rate->index == IWL_RATE_INVALID)
 778                 return -EINVAL;
 779
 780         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 781
 782         /* Legacy */
 783         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 784             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 785                 if (num_of_ant == 1) {
 786                         if (band == IEEE80211_BAND_5GHZ)
 787                                 rate->type = LQ_LEGACY_A;
 788                         else
 789                                 rate->type = LQ_LEGACY_G;
 790                 }
 791
 792                 return 0;
 793         }
 794
 795         /* HT or VHT */
 796         if (ucode_rate & RATE_MCS_SGI_MSK)
 797                 rate->sgi = true;
 798         if (ucode_rate & RATE_MCS_LDPC_MSK)
 799                 rate->ldpc = true;
 800         if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
 801                 rate->stbc = true;
 802
 803         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 804
 805         if (ucode_rate & RATE_MCS_HT_MSK) {
 806                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 807                        RATE_HT_MCS_NSS_POS) + 1;
 808
 809                 if (nss == 1) {
 810                         rate->type = LQ_HT_SISO;
 811                         WARN_ON_ONCE(!rate->stbc && num_of_ant != 1);
 812                 } else if (nss == 2) {
 813                         rate->type = LQ_HT_MIMO2;
 814                         WARN_ON_ONCE(num_of_ant != 2);
 815                 } else {
 816                         WARN_ON_ONCE(1);
 817                 }
 818         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 819                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 820                        RATE_VHT_MCS_NSS_POS) + 1;
 821
 822                 if (nss == 1) {
 823                         rate->type = LQ_VHT_SISO;
 824                         WARN_ON_ONCE(!rate->stbc && num_of_ant != 1);
 825                 } else if (nss == 2) {
 826                         rate->type = LQ_VHT_MIMO2;
 827                         WARN_ON_ONCE(num_of_ant != 2);
 828                 } else {
 829                         WARN_ON_ONCE(1);
 830                 }
 831         }
 832
 833         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
 834         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 835                      !is_vht(rate));
 836
 837         return 0;
 838 }
 839
 840 /* switch to another antenna/antennas and return 1 */
 841 /* if no other valid antenna found, return 0 */
 842 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 843 {
 844         u8 new_ant_type;
 845
 846         if (!rate->ant || rate->ant > ANT_ABC)
 847                 return 0;
 848
 849         if (!rs_is_valid_ant(valid_ant, rate->ant))
 850                 return 0;
 851
 852         new_ant_type = ant_toggle_lookup[rate->ant];
 853
 854         while ((new_ant_type != rate->ant) &&
 855                !rs_is_valid_ant(valid_ant, new_ant_type))
 856                 new_ant_type = ant_toggle_lookup[new_ant_type];
 857
 858         if (new_ant_type == rate->ant)
 859                 return 0;
 860
 861         rate->ant = new_ant_type;
 862
 863         return 1;
 864 }
 865
 866 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 867                                   struct rs_rate *rate)
 868 {
 869         if (is_legacy(rate))
 870                 return lq_sta->active_legacy_rate;
 871         else if (is_siso(rate))
 872                 return lq_sta->active_siso_rate;
 873         else if (is_mimo2(rate))
 874                 return lq_sta->active_mimo2_rate;
 875
 876         WARN_ON_ONCE(1);
 877         return 0;
 878 }
 879
 880 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 881                                 int rate_type)
 882 {
 883         u8 high = IWL_RATE_INVALID;
 884         u8 low = IWL_RATE_INVALID;
 885
 886         /* 802.11A or ht walks to the next literal adjacent rate in
 887          * the rate table */
 888         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 889                 int i;
 890                 u32 mask;
 891
 892                 /* Find the previous rate that is in the rate mask */
 893                 i = index - 1;
 894                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 895                         if (rate_mask & mask) {
 896                                 low = i;
 897                                 break;
 898                         }
 899                 }
 900
 901                 /* Find the next rate that is in the rate mask */
 902                 i = index + 1;
 903                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 904                         if (rate_mask & mask) {
 905                                 high = i;
 906                                 break;
 907                         }
 908                 }
 909
 910                 return (high << 8) | low;
 911         }
 912
 913         low = index;
 914         while (low != IWL_RATE_INVALID) {
 915                 low = iwl_rates[low].prev_rs;
 916                 if (low == IWL_RATE_INVALID)
 917                         break;
 918                 if (rate_mask & (1 << low))
 919                         break;
 920                 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
 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                 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
 931         }
 932
 933         return (high << 8) | low;
 934 }
 935
 936 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
 937                                      struct rs_rate *rate)
 938 {
 939         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
 940 }
 941
 942 /* Get the next supported lower rate in the current column.
 943  * Return true if bottom rate in the current column was reached
 944  */
 945 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
 946                                         struct rs_rate *rate)
 947 {
 948         u8 low;
 949         u16 high_low;
 950         u16 rate_mask;
 951         struct iwl_mvm *mvm = lq_sta->pers.drv;
 952
 953         rate_mask = rs_get_supported_rates(lq_sta, rate);
 954         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
 955                                         rate->type);
 956         low = high_low & 0xff;
 957
 958         /* Bottom rate of column reached */
 959         if (low == IWL_RATE_INVALID)
 960                 return true;
 961
 962         rate->index = low;
 963         return false;
 964 }
 965
 966 /* Get the next rate to use following a column downgrade */
 967 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
 968                                           struct rs_rate *rate)
 969 {
 970         struct iwl_mvm *mvm = lq_sta->pers.drv;
 971
 972         if (is_legacy(rate)) {
 973                 /* No column to downgrade from Legacy */
 974                 return;
 975         } else if (is_siso(rate)) {
 976                 /* Downgrade to Legacy if we were in SISO */
 977                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 978                         rate->type = LQ_LEGACY_A;
 979                 else
 980                         rate->type = LQ_LEGACY_G;
 981
 982                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
 983
 984                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
 985                              rate->index > IWL_RATE_MCS_9_INDEX);
 986
 987                 rate->index = rs_ht_to_legacy[rate->index];
 988                 rate->ldpc = false;
 989         } else {
 990                 /* Downgrade to SISO with same MCS if in MIMO  */
 991                 rate->type = is_vht_mimo2(rate) ?
 992                         LQ_VHT_SISO : LQ_HT_SISO;
 993         }
 994
 995         if (num_of_ant(rate->ant) > 1)
 996                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
 997
 998         /* Relevant in both switching to SISO or Legacy */
 999         rate->sgi = false;
1000
1001         if (!rs_rate_supported(lq_sta, rate))
1002                 rs_get_lower_rate_in_column(lq_sta, rate);
1003 }
1004
1005 /* Simple function to compare two rate scale table types */
1006 static inline bool rs_rate_match(struct rs_rate *a,
1007                                  struct rs_rate *b)
1008 {
1009         bool ant_match;
1010
1011         if (a->stbc)
1012                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1013         else
1014                 ant_match = (a->ant == b->ant);
1015
1016         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1017                 && ant_match;
1018 }
1019
1020 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
1021 {
1022         if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
1023                 return RATE_MCS_CHAN_WIDTH_40;
1024         else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
1025                 return RATE_MCS_CHAN_WIDTH_80;
1026         else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
1027                 return RATE_MCS_CHAN_WIDTH_160;
1028
1029         return RATE_MCS_CHAN_WIDTH_20;
1030 }
1031
1032 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1033 {
1034         u8 tid = IWL_MAX_TID_COUNT;
1035
1036         if (ieee80211_is_data_qos(hdr->frame_control)) {
1037                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1038                 tid = qc[0] & 0xf;
1039         }
1040
1041         if (unlikely(tid > IWL_MAX_TID_COUNT))
1042                 tid = IWL_MAX_TID_COUNT;
1043
1044         return tid;
1045 }
1046
1047 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1048                           int tid, struct ieee80211_tx_info *info)
1049 {
1050         int legacy_success;
1051         int retries;
1052         int mac_index, i;
1053         struct iwl_lq_cmd *table;
1054         enum mac80211_rate_control_flags mac_flags;
1055         u32 ucode_rate;
1056         struct rs_rate rate;
1057         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1058         u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1059         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1060         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1061
1062         /* Treat uninitialized rate scaling data same as non-existing. */
1063         if (!lq_sta) {
1064                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1065                 return;
1066         } else if (!lq_sta->pers.drv) {
1067                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1068                 return;
1069         }
1070
1071 #ifdef CONFIG_MAC80211_DEBUGFS
1072         /* Disable last tx check if we are debugging with fixed rate */
1073         if (lq_sta->pers.dbg_fixed_rate) {
1074                 IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n");
1075                 return;
1076         }
1077 #endif
1078         /* This packet was aggregated but doesn't carry status info */
1079         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1080             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1081                 return;
1082
1083         /*
1084          * Ignore this Tx frame response if its initial rate doesn't match
1085          * that of latest Link Quality command.  There may be stragglers
1086          * from a previous Link Quality command, but we're no longer interested
1087          * in those; they're either from the "active" mode while we're trying
1088          * to check "search" mode, or a prior "search" mode after we've moved
1089          * to a new "search" mode (which might become the new "active" mode).
1090          */
1091         table = &lq_sta->lq;
1092         ucode_rate = le32_to_cpu(table->rs_table[0]);
1093         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1094         if (info->band == IEEE80211_BAND_5GHZ)
1095                 rate.index -= IWL_FIRST_OFDM_RATE;
1096         mac_flags = info->status.rates[0].flags;
1097         mac_index = info->status.rates[0].idx;
1098         /* For HT packets, map MCS to PLCP */
1099         if (mac_flags & IEEE80211_TX_RC_MCS) {
1100                 /* Remove # of streams */
1101                 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1102                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1103                         mac_index++;
1104                 /*
1105                  * mac80211 HT index is always zero-indexed; we need to move
1106                  * HT OFDM rates after CCK rates in 2.4 GHz band
1107                  */
1108                 if (info->band == IEEE80211_BAND_2GHZ)
1109                         mac_index += IWL_FIRST_OFDM_RATE;
1110         } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1111                 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1112                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1113                         mac_index++;
1114         }
1115
1116         if (time_after(jiffies,
1117                        (unsigned long)(lq_sta->last_tx +
1118                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1119                 int t;
1120
1121                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1122                 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1123                         ieee80211_stop_tx_ba_session(sta, t);
1124
1125                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1126                 return;
1127         }
1128         lq_sta->last_tx = jiffies;
1129
1130         /* Here we actually compare this rate to the latest LQ command */
1131         if ((mac_index < 0) ||
1132             (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1133             (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1134             (rate.ant != info->status.antenna) ||
1135             (!!(ucode_rate & RATE_MCS_HT_MSK) !=
1136              !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
1137             (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
1138              !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
1139             (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
1140              !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
1141             (rate.index != mac_index)) {
1142                 IWL_DEBUG_RATE(mvm,
1143                                "initial rate %d does not match %d (0x%x)\n",
1144                                mac_index, rate.index, ucode_rate);
1145                 /*
1146                  * Since rates mis-match, the last LQ command may have failed.
1147                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1148                  * ... driver.
1149                  */
1150                 lq_sta->missed_rate_counter++;
1151                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1152                         lq_sta->missed_rate_counter = 0;
1153                         IWL_DEBUG_RATE(mvm,
1154                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1155                                        lq_sta->rs_state);
1156                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1157                 }
1158                 /* Regardless, ignore this status info for outdated rate */
1159                 return;
1160         } else
1161                 /* Rate did match, so reset the missed_rate_counter */
1162                 lq_sta->missed_rate_counter = 0;
1163
1164         if (!lq_sta->search_better_tbl) {
1165                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1166                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1167         } else {
1168                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1169                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1170         }
1171
1172         if (WARN_ON_ONCE(!rs_rate_match(&rate, &curr_tbl->rate))) {
1173                 IWL_DEBUG_RATE(mvm,
1174                                "Neither active nor search matches tx rate\n");
1175                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1176                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1177                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1178                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1179                 rs_dump_rate(mvm, &rate, "ACTUAL");
1180
1181                 /*
1182                  * no matching table found, let's by-pass the data collection
1183                  * and continue to perform rate scale to find the rate table
1184                  */
1185                 rs_stay_in_table(lq_sta, true);
1186                 goto done;
1187         }
1188
1189         /*
1190          * Updating the frame history depends on whether packets were
1191          * aggregated.
1192          *
1193          * For aggregation, all packets were transmitted at the same rate, the
1194          * first index into rate scale table.
1195          */
1196         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1197                 /* ampdu_ack_len = 0 marks no BA was received. In this case
1198                  * treat it as a single frame loss as we don't want the success
1199                  * ratio to dip too quickly because a BA wasn't received
1200                  */
1201                 if (info->status.ampdu_ack_len == 0)
1202                         info->status.ampdu_len = 1;
1203
1204                 ucode_rate = le32_to_cpu(table->rs_table[0]);
1205                 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1206                 rs_collect_tx_data(mvm, lq_sta, curr_tbl, rate.index,
1207                                    info->status.ampdu_len,
1208                                    info->status.ampdu_ack_len,
1209                                    reduced_txp);
1210
1211                 /* Update success/fail counts if not searching for new mode */
1212                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1213                         lq_sta->total_success += info->status.ampdu_ack_len;
1214                         lq_sta->total_failed += (info->status.ampdu_len -
1215                                         info->status.ampdu_ack_len);
1216                 }
1217         } else {
1218         /*
1219          * For legacy, update frame history with for each Tx retry.
1220          */
1221                 retries = info->status.rates[0].count - 1;
1222                 /* HW doesn't send more than 15 retries */
1223                 retries = min(retries, 15);
1224
1225                 /* The last transmission may have been successful */
1226                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1227                 /* Collect data for each rate used during failed TX attempts */
1228                 for (i = 0; i <= retries; ++i) {
1229                         ucode_rate = le32_to_cpu(table->rs_table[i]);
1230                         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1231                         /*
1232                          * Only collect stats if retried rate is in the same RS
1233                          * table as active/search.
1234                          */
1235                         if (rs_rate_match(&rate, &curr_tbl->rate))
1236                                 tmp_tbl = curr_tbl;
1237                         else if (rs_rate_match(&rate, &other_tbl->rate))
1238                                 tmp_tbl = other_tbl;
1239                         else
1240                                 continue;
1241
1242                         rs_collect_tx_data(mvm, lq_sta, tmp_tbl, rate.index, 1,
1243                                            i < retries ? 0 : legacy_success,
1244                                            reduced_txp);
1245                 }
1246
1247                 /* Update success/fail counts if not searching for new mode */
1248                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1249                         lq_sta->total_success += legacy_success;
1250                         lq_sta->total_failed += retries + (1 - legacy_success);
1251                 }
1252         }
1253         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1254         lq_sta->last_rate_n_flags = ucode_rate;
1255         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1256 done:
1257         /* See if there's a better rate or modulation mode to try. */
1258         if (sta->supp_rates[info->band])
1259                 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1260 }
1261
1262 /*
1263  * mac80211 sends us Tx status
1264  */
1265 static void rs_mac80211_tx_status(void *mvm_r,
1266                                   struct ieee80211_supported_band *sband,
1267                                   struct ieee80211_sta *sta, void *priv_sta,
1268                                   struct sk_buff *skb)
1269 {
1270         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1271         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1272         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1273         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1274
1275         if (!ieee80211_is_data(hdr->frame_control) ||
1276             info->flags & IEEE80211_TX_CTL_NO_ACK)
1277                 return;
1278
1279         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1280 }
1281
1282 /*
1283  * Begin a period of staying with a selected modulation mode.
1284  * Set "stay_in_tbl" flag to prevent any mode switches.
1285  * Set frame tx success limits according to legacy vs. high-throughput,
1286  * and reset overall (spanning all rates) tx success history statistics.
1287  * These control how long we stay using same modulation mode before
1288  * searching for a new mode.
1289  */
1290 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1291                                  struct iwl_lq_sta *lq_sta)
1292 {
1293         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1294         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1295         if (is_legacy) {
1296                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1297                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1298                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1299         } else {
1300                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1301                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1302                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1303         }
1304         lq_sta->table_count = 0;
1305         lq_sta->total_failed = 0;
1306         lq_sta->total_success = 0;
1307         lq_sta->flush_timer = jiffies;
1308         lq_sta->visited_columns = 0;
1309 }
1310
1311 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1312 {
1313         if (rate_mask)
1314                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1315         return IWL_RATE_INVALID;
1316 }
1317
1318 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1319                                    const struct rs_tx_column *column)
1320 {
1321         switch (column->mode) {
1322         case RS_LEGACY:
1323                 return lq_sta->max_legacy_rate_idx;
1324         case RS_SISO:
1325                 return lq_sta->max_siso_rate_idx;
1326         case RS_MIMO2:
1327                 return lq_sta->max_mimo2_rate_idx;
1328         default:
1329                 WARN_ON_ONCE(1);
1330         }
1331
1332         return lq_sta->max_legacy_rate_idx;
1333 }
1334
1335 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1336                                             const struct rs_tx_column *column,
1337                                             u32 bw)
1338 {
1339         /* Used to choose among HT tables */
1340         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1341
1342         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1343                          column->mode != RS_SISO &&
1344                          column->mode != RS_MIMO2))
1345                 return expected_tpt_legacy;
1346
1347         /* Legacy rates have only one table */
1348         if (column->mode == RS_LEGACY)
1349                 return expected_tpt_legacy;
1350
1351         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1352         /* Choose among many HT tables depending on number of streams
1353          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1354          * status */
1355         if (column->mode == RS_SISO) {
1356                 switch (bw) {
1357                 case RATE_MCS_CHAN_WIDTH_20:
1358                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1359                         break;
1360                 case RATE_MCS_CHAN_WIDTH_40:
1361                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1362                         break;
1363                 case RATE_MCS_CHAN_WIDTH_80:
1364                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1365                         break;
1366                 default:
1367                         WARN_ON_ONCE(1);
1368                 }
1369         } else if (column->mode == RS_MIMO2) {
1370                 switch (bw) {
1371                 case RATE_MCS_CHAN_WIDTH_20:
1372                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1373                         break;
1374                 case RATE_MCS_CHAN_WIDTH_40:
1375                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1376                         break;
1377                 case RATE_MCS_CHAN_WIDTH_80:
1378                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1379                         break;
1380                 default:
1381                         WARN_ON_ONCE(1);
1382                 }
1383         } else {
1384                 WARN_ON_ONCE(1);
1385         }
1386
1387         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1388                 return ht_tbl_pointer[0];
1389         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1390                 return ht_tbl_pointer[1];
1391         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1392                 return ht_tbl_pointer[2];
1393         else                                            /* AGG+SGI */
1394                 return ht_tbl_pointer[3];
1395 }
1396
1397 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1398                                       struct iwl_scale_tbl_info *tbl)
1399 {
1400         struct rs_rate *rate = &tbl->rate;
1401         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1402
1403         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1404 }
1405
1406 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1407                             struct iwl_lq_sta *lq_sta,
1408                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1409                             unsigned long rate_mask, s8 index)
1410 {
1411         struct iwl_scale_tbl_info *active_tbl =
1412             &(lq_sta->lq_info[lq_sta->active_tbl]);
1413         s32 success_ratio = active_tbl->win[index].success_ratio;
1414         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1415         const u16 *tpt_tbl = tbl->expected_tpt;
1416         u16 high_low;
1417         u32 target_tpt;
1418         int rate_idx;
1419
1420         if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) {
1421                 target_tpt = 100 * expected_current_tpt;
1422                 IWL_DEBUG_RATE(mvm,
1423                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1424                                success_ratio, target_tpt);
1425         } else {
1426                 target_tpt = lq_sta->last_tpt;
1427                 IWL_DEBUG_RATE(mvm,
1428                                "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1429                                success_ratio, target_tpt);
1430         }
1431
1432         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1433
1434         while (rate_idx != IWL_RATE_INVALID) {
1435                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1436                         break;
1437
1438                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1439                                                 tbl->rate.type);
1440
1441                 rate_idx = (high_low >> 8) & 0xff;
1442         }
1443
1444         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1445                        rate_idx, target_tpt,
1446                        rate_idx != IWL_RATE_INVALID ?
1447                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1448
1449         return rate_idx;
1450 }
1451
1452 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1453 {
1454         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1455                 return RATE_MCS_CHAN_WIDTH_80;
1456         else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1457                 return RATE_MCS_CHAN_WIDTH_40;
1458
1459         return RATE_MCS_CHAN_WIDTH_20;
1460 }
1461
1462 /*
1463  * Check whether we should continue using same modulation mode, or
1464  * begin search for a new mode, based on:
1465  * 1) # tx successes or failures while using this mode
1466  * 2) # times calling this function
1467  * 3) elapsed time in this mode (not used, for now)
1468  */
1469 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1470 {
1471         struct iwl_scale_tbl_info *tbl;
1472         int active_tbl;
1473         int flush_interval_passed = 0;
1474         struct iwl_mvm *mvm;
1475
1476         mvm = lq_sta->pers.drv;
1477         active_tbl = lq_sta->active_tbl;
1478
1479         tbl = &(lq_sta->lq_info[active_tbl]);
1480
1481         /* If we've been disallowing search, see if we should now allow it */
1482         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1483                 /* Elapsed time using current modulation mode */
1484                 if (lq_sta->flush_timer)
1485                         flush_interval_passed =
1486                                 time_after(jiffies,
1487                                            (unsigned long)(lq_sta->flush_timer +
1488                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1489
1490                 /*
1491                  * Check if we should allow search for new modulation mode.
1492                  * If many frames have failed or succeeded, or we've used
1493                  * this same modulation for a long time, allow search, and
1494                  * reset history stats that keep track of whether we should
1495                  * allow a new search.  Also (below) reset all bitmaps and
1496                  * stats in active history.
1497                  */
1498                 if (force_search ||
1499                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1500                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1501                     ((!lq_sta->search_better_tbl) &&
1502                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1503                         IWL_DEBUG_RATE(mvm,
1504                                        "LQ: stay is expired %d %d %d\n",
1505                                      lq_sta->total_failed,
1506                                      lq_sta->total_success,
1507                                      flush_interval_passed);
1508
1509                         /* Allow search for new mode */
1510                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1511                         IWL_DEBUG_RATE(mvm,
1512                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1513                         lq_sta->total_failed = 0;
1514                         lq_sta->total_success = 0;
1515                         lq_sta->flush_timer = 0;
1516                         /* mark the current column as visited */
1517                         lq_sta->visited_columns = BIT(tbl->column);
1518                 /*
1519                  * Else if we've used this modulation mode enough repetitions
1520                  * (regardless of elapsed time or success/failure), reset
1521                  * history bitmaps and rate-specific stats for all rates in
1522                  * active table.
1523                  */
1524                 } else {
1525                         lq_sta->table_count++;
1526                         if (lq_sta->table_count >=
1527                             lq_sta->table_count_limit) {
1528                                 lq_sta->table_count = 0;
1529
1530                                 IWL_DEBUG_RATE(mvm,
1531                                                "LQ: stay in table clear win\n");
1532                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1533                         }
1534                 }
1535
1536                 /* If transitioning to allow "search", reset all history
1537                  * bitmaps and stats in active table (this will become the new
1538                  * "search" table). */
1539                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1540                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1541                 }
1542         }
1543 }
1544
1545 /*
1546  * setup rate table in uCode
1547  */
1548 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1549                                struct ieee80211_sta *sta,
1550                                struct iwl_lq_sta *lq_sta,
1551                                struct rs_rate *rate)
1552 {
1553         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
1554         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1555 }
1556
1557 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1558                                          struct iwl_lq_sta *lq_sta,
1559                                          struct ieee80211_sta *sta,
1560                                          struct iwl_scale_tbl_info *tbl)
1561 {
1562         int i, j, max_rate;
1563         enum rs_column next_col_id;
1564         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1565         const struct rs_tx_column *next_col;
1566         allow_column_func_t allow_func;
1567         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1568         const u16 *expected_tpt_tbl;
1569         u16 tpt, max_expected_tpt;
1570
1571         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1572                 next_col_id = curr_col->next_columns[i];
1573
1574                 if (next_col_id == RS_COLUMN_INVALID)
1575                         continue;
1576
1577                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1578                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1579                                        next_col_id);
1580                         continue;
1581                 }
1582
1583                 next_col = &rs_tx_columns[next_col_id];
1584
1585                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1586                         IWL_DEBUG_RATE(mvm,
1587                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1588                                        next_col_id, valid_ants, next_col->ant);
1589                         continue;
1590                 }
1591
1592                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1593                         allow_func = next_col->checks[j];
1594                         if (allow_func && !allow_func(mvm, sta, tbl))
1595                                 break;
1596                 }
1597
1598                 if (j != MAX_COLUMN_CHECKS) {
1599                         IWL_DEBUG_RATE(mvm,
1600                                        "Skip column %d: not allowed (check %d failed)\n",
1601                                        next_col_id, j);
1602
1603                         continue;
1604                 }
1605
1606                 tpt = lq_sta->last_tpt / 100;
1607                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1608                                                      rs_bw_from_sta_bw(sta));
1609                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1610                         continue;
1611
1612                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1613                 if (max_rate == IWL_RATE_INVALID) {
1614                         IWL_DEBUG_RATE(mvm,
1615                                        "Skip column %d: no rate is allowed in this column\n",
1616                                        next_col_id);
1617                         continue;
1618                 }
1619
1620                 max_expected_tpt = expected_tpt_tbl[max_rate];
1621                 if (tpt >= max_expected_tpt) {
1622                         IWL_DEBUG_RATE(mvm,
1623                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1624                                        next_col_id, max_expected_tpt, tpt);
1625                         continue;
1626                 }
1627
1628                 IWL_DEBUG_RATE(mvm,
1629                                "Found potential column %d. Max expected %d current %d\n",
1630                                next_col_id, max_expected_tpt, tpt);
1631                 break;
1632         }
1633
1634         if (i == MAX_NEXT_COLUMNS)
1635                 return RS_COLUMN_INVALID;
1636
1637         return next_col_id;
1638 }
1639
1640 static int rs_switch_to_column(struct iwl_mvm *mvm,
1641                                struct iwl_lq_sta *lq_sta,
1642                                struct ieee80211_sta *sta,
1643                                enum rs_column col_id)
1644 {
1645         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1646         struct iwl_scale_tbl_info *search_tbl =
1647                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1648         struct rs_rate *rate = &search_tbl->rate;
1649         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1650         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1651         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1652                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1653         unsigned long rate_mask = 0;
1654         u32 rate_idx = 0;
1655
1656         memcpy(search_tbl, tbl, sz);
1657
1658         rate->sgi = column->sgi;
1659         rate->ant = column->ant;
1660
1661         if (column->mode == RS_LEGACY) {
1662                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1663                         rate->type = LQ_LEGACY_A;
1664                 else
1665                         rate->type = LQ_LEGACY_G;
1666
1667                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1668                 rate->ldpc = false;
1669                 rate_mask = lq_sta->active_legacy_rate;
1670         } else if (column->mode == RS_SISO) {
1671                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1672                 rate_mask = lq_sta->active_siso_rate;
1673         } else if (column->mode == RS_MIMO2) {
1674                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1675                 rate_mask = lq_sta->active_mimo2_rate;
1676         } else {
1677                 WARN_ON_ONCE("Bad column mode");
1678         }
1679
1680         if (column->mode != RS_LEGACY) {
1681                 rate->bw = rs_bw_from_sta_bw(sta);
1682                 rate->ldpc = lq_sta->ldpc;
1683         }
1684
1685         search_tbl->column = col_id;
1686         rs_set_expected_tpt_table(lq_sta, search_tbl);
1687
1688         lq_sta->visited_columns |= BIT(col_id);
1689
1690         /* Get the best matching rate if we're changing modes. e.g.
1691          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1692          */
1693         if (curr_column->mode != column->mode) {
1694                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1695                                             rate_mask, rate->index);
1696
1697                 if ((rate_idx == IWL_RATE_INVALID) ||
1698                     !(BIT(rate_idx) & rate_mask)) {
1699                         IWL_DEBUG_RATE(mvm,
1700                                        "can not switch with index %d"
1701                                        " rate mask %lx\n",
1702                                        rate_idx, rate_mask);
1703
1704                         goto err;
1705                 }
1706
1707                 rate->index = rate_idx;
1708         }
1709
1710         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1711                        col_id, rate->index);
1712
1713         return 0;
1714
1715 err:
1716         rate->type = LQ_NONE;
1717         return -1;
1718 }
1719
1720 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1721                                          struct iwl_scale_tbl_info *tbl,
1722                                          s32 sr, int low, int high,
1723                                          int current_tpt,
1724                                          int low_tpt, int high_tpt)
1725 {
1726         enum rs_action action = RS_ACTION_STAY;
1727
1728         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1729             (current_tpt == 0)) {
1730                 IWL_DEBUG_RATE(mvm,
1731                                "Decrease rate because of low SR\n");
1732                 return RS_ACTION_DOWNSCALE;
1733         }
1734
1735         if ((low_tpt == IWL_INVALID_VALUE) &&
1736             (high_tpt == IWL_INVALID_VALUE) &&
1737             (high != IWL_RATE_INVALID)) {
1738                 IWL_DEBUG_RATE(mvm,
1739                                "No data about high/low rates. Increase rate\n");
1740                 return RS_ACTION_UPSCALE;
1741         }
1742
1743         if ((high_tpt == IWL_INVALID_VALUE) &&
1744             (high != IWL_RATE_INVALID) &&
1745             (low_tpt != IWL_INVALID_VALUE) &&
1746             (low_tpt < current_tpt)) {
1747                 IWL_DEBUG_RATE(mvm,
1748                                "No data about high rate and low rate is worse. Increase rate\n");
1749                 return RS_ACTION_UPSCALE;
1750         }
1751
1752         if ((high_tpt != IWL_INVALID_VALUE) &&
1753             (high_tpt > current_tpt)) {
1754                 IWL_DEBUG_RATE(mvm,
1755                                "Higher rate is better. Increate rate\n");
1756                 return RS_ACTION_UPSCALE;
1757         }
1758
1759         if ((low_tpt != IWL_INVALID_VALUE) &&
1760             (high_tpt != IWL_INVALID_VALUE) &&
1761             (low_tpt < current_tpt) &&
1762             (high_tpt < current_tpt)) {
1763                 IWL_DEBUG_RATE(mvm,
1764                                "Both high and low are worse. Maintain rate\n");
1765                 return RS_ACTION_STAY;
1766         }
1767
1768         if ((low_tpt != IWL_INVALID_VALUE) &&
1769             (low_tpt > current_tpt)) {
1770                 IWL_DEBUG_RATE(mvm,
1771                                "Lower rate is better\n");
1772                 action = RS_ACTION_DOWNSCALE;
1773                 goto out;
1774         }
1775
1776         if ((low_tpt == IWL_INVALID_VALUE) &&
1777             (low != IWL_RATE_INVALID)) {
1778                 IWL_DEBUG_RATE(mvm,
1779                                "No data about lower rate\n");
1780                 action = RS_ACTION_DOWNSCALE;
1781                 goto out;
1782         }
1783
1784         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1785
1786 out:
1787         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1788                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1789                         IWL_DEBUG_RATE(mvm,
1790                                        "SR is above NO DECREASE. Avoid downscale\n");
1791                         action = RS_ACTION_STAY;
1792                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1793                         IWL_DEBUG_RATE(mvm,
1794                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1795                         action = RS_ACTION_STAY;
1796                 } else {
1797                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1798                 }
1799         }
1800
1801         return action;
1802 }
1803
1804 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1805                           struct iwl_lq_sta *lq_sta)
1806 {
1807         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1808         struct ieee80211_vif *vif = mvmsta->vif;
1809         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1810                                 !vif->bss_conf.ps);
1811
1812         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1813          * supports STBC of at least 1*SS
1814          */
1815         if (!lq_sta->stbc)
1816                 return false;
1817
1818         if (!mvm->ps_disabled && !sta_ps_disabled)
1819                 return false;
1820
1821         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1822                 return false;
1823
1824         return true;
1825 }
1826
1827 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1828                                 int *weaker, int *stronger)
1829 {
1830         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1831         if (*weaker > TPC_MAX_REDUCTION)
1832                 *weaker = TPC_INVALID;
1833
1834         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1835         if (*stronger < 0)
1836                 *stronger = TPC_INVALID;
1837 }
1838
1839 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1840                            struct rs_rate *rate, enum ieee80211_band band)
1841 {
1842         int index = rate->index;
1843         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1844         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1845                                 !vif->bss_conf.ps);
1846
1847         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1848                        cam, sta_ps_disabled);
1849         /*
1850          * allow tpc only if power management is enabled, or bt coex
1851          * activity grade allows it and we are on 2.4Ghz.
1852          */
1853         if ((cam || sta_ps_disabled) &&
1854             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1855                 return false;
1856
1857         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1858         if (is_legacy(rate))
1859                 return index == IWL_RATE_54M_INDEX;
1860         if (is_ht(rate))
1861                 return index == IWL_RATE_MCS_7_INDEX;
1862         if (is_vht(rate))
1863                 return index == IWL_RATE_MCS_7_INDEX ||
1864                        index == IWL_RATE_MCS_8_INDEX ||
1865                        index == IWL_RATE_MCS_9_INDEX;
1866
1867         WARN_ON_ONCE(1);
1868         return false;
1869 }
1870
1871 enum tpc_action {
1872         TPC_ACTION_STAY,
1873         TPC_ACTION_DECREASE,
1874         TPC_ACTION_INCREASE,
1875         TPC_ACTION_NO_RESTIRCTION,
1876 };
1877
1878 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1879                                          s32 sr, int weak, int strong,
1880                                          int current_tpt,
1881                                          int weak_tpt, int strong_tpt)
1882 {
1883         /* stay until we have valid tpt */
1884         if (current_tpt == IWL_INVALID_VALUE) {
1885                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1886                 return TPC_ACTION_STAY;
1887         }
1888
1889         /* Too many failures, increase txp */
1890         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1891             current_tpt == 0) {
1892                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1893                 return TPC_ACTION_NO_RESTIRCTION;
1894         }
1895
1896         /* try decreasing first if applicable */
1897         if (weak != TPC_INVALID) {
1898                 if (weak_tpt == IWL_INVALID_VALUE &&
1899                     (strong_tpt == IWL_INVALID_VALUE ||
1900                      current_tpt >= strong_tpt)) {
1901                         IWL_DEBUG_RATE(mvm,
1902                                        "no weak txp measurement. decrease txp\n");
1903                         return TPC_ACTION_DECREASE;
1904                 }
1905
1906                 if (weak_tpt > current_tpt) {
1907                         IWL_DEBUG_RATE(mvm,
1908                                        "lower txp has better tpt. decrease txp\n");
1909                         return TPC_ACTION_DECREASE;
1910                 }
1911         }
1912
1913         /* next, increase if needed */
1914         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1915             strong != TPC_INVALID) {
1916                 if (weak_tpt == IWL_INVALID_VALUE &&
1917                     strong_tpt != IWL_INVALID_VALUE &&
1918                     current_tpt < strong_tpt) {
1919                         IWL_DEBUG_RATE(mvm,
1920                                        "higher txp has better tpt. increase txp\n");
1921                         return TPC_ACTION_INCREASE;
1922                 }
1923
1924                 if (weak_tpt < current_tpt &&
1925                     (strong_tpt == IWL_INVALID_VALUE ||
1926                      strong_tpt > current_tpt)) {
1927                         IWL_DEBUG_RATE(mvm,
1928                                        "lower txp has worse tpt. increase txp\n");
1929                         return TPC_ACTION_INCREASE;
1930                 }
1931         }
1932
1933         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1934         return TPC_ACTION_STAY;
1935 }
1936
1937 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1938                            struct ieee80211_sta *sta,
1939                            struct iwl_lq_sta *lq_sta,
1940                            struct iwl_scale_tbl_info *tbl)
1941 {
1942         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1943         struct ieee80211_vif *vif = mvm_sta->vif;
1944         struct ieee80211_chanctx_conf *chanctx_conf;
1945         enum ieee80211_band band;
1946         struct iwl_rate_scale_data *window;
1947         struct rs_rate *rate = &tbl->rate;
1948         enum tpc_action action;
1949         s32 sr;
1950         u8 cur = lq_sta->lq.reduced_tpc;
1951         int current_tpt;
1952         int weak, strong;
1953         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1954
1955 #ifdef CONFIG_MAC80211_DEBUGFS
1956         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1957                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1958                                lq_sta->pers.dbg_fixed_txp_reduction);
1959                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1960                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1961         }
1962 #endif
1963
1964         rcu_read_lock();
1965         chanctx_conf = rcu_dereference(vif->chanctx_conf);
1966         if (WARN_ON(!chanctx_conf))
1967                 band = IEEE80211_NUM_BANDS;
1968         else
1969                 band = chanctx_conf->def.chan->band;
1970         rcu_read_unlock();
1971
1972         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1973                 IWL_DEBUG_RATE(mvm,
1974                                "tpc is not allowed. remove txp restrictions\n");
1975                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1976                 return cur != TPC_NO_REDUCTION;
1977         }
1978
1979         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1980
1981         /* Collect measured throughputs for current and adjacent rates */
1982         window = tbl->tpc_win;
1983         sr = window[cur].success_ratio;
1984         current_tpt = window[cur].average_tpt;
1985         if (weak != TPC_INVALID)
1986                 weak_tpt = window[weak].average_tpt;
1987         if (strong != TPC_INVALID)
1988                 strong_tpt = window[strong].average_tpt;
1989
1990         IWL_DEBUG_RATE(mvm,
1991                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1992                        cur, current_tpt, sr, weak, strong,
1993                        weak_tpt, strong_tpt);
1994
1995         action = rs_get_tpc_action(mvm, sr, weak, strong,
1996                                    current_tpt, weak_tpt, strong_tpt);
1997
1998         /* override actions if we are on the edge */
1999         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2000                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2001                 action = TPC_ACTION_STAY;
2002         } else if (strong == TPC_INVALID &&
2003                    (action == TPC_ACTION_INCREASE ||
2004                     action == TPC_ACTION_NO_RESTIRCTION)) {
2005                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2006                 action = TPC_ACTION_STAY;
2007         }
2008
2009         switch (action) {
2010         case TPC_ACTION_DECREASE:
2011                 lq_sta->lq.reduced_tpc = weak;
2012                 return true;
2013         case TPC_ACTION_INCREASE:
2014                 lq_sta->lq.reduced_tpc = strong;
2015                 return true;
2016         case TPC_ACTION_NO_RESTIRCTION:
2017                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2018                 return true;
2019         case TPC_ACTION_STAY:
2020                 /* do nothing */
2021                 break;
2022         }
2023         return false;
2024 }
2025
2026 /*
2027  * Do rate scaling and search for new modulation mode.
2028  */
2029 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2030                                   struct ieee80211_sta *sta,
2031                                   struct iwl_lq_sta *lq_sta,
2032                                   int tid)
2033 {
2034         int low = IWL_RATE_INVALID;
2035         int high = IWL_RATE_INVALID;
2036         int index;
2037         struct iwl_rate_scale_data *window = NULL;
2038         int current_tpt = IWL_INVALID_VALUE;
2039         int low_tpt = IWL_INVALID_VALUE;
2040         int high_tpt = IWL_INVALID_VALUE;
2041         u32 fail_count;
2042         enum rs_action scale_action = RS_ACTION_STAY;
2043         u16 rate_mask;
2044         u8 update_lq = 0;
2045         struct iwl_scale_tbl_info *tbl, *tbl1;
2046         u8 active_tbl = 0;
2047         u8 done_search = 0;
2048         u16 high_low;
2049         s32 sr;
2050         u8 prev_agg = lq_sta->is_agg;
2051         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2052         struct iwl_mvm_tid_data *tid_data;
2053         struct rs_rate *rate;
2054
2055         lq_sta->is_agg = !!sta_priv->agg_tids;
2056
2057         /*
2058          * Select rate-scale / modulation-mode table to work with in
2059          * the rest of this function:  "search" if searching for better
2060          * modulation mode, or "active" if doing rate scaling within a mode.
2061          */
2062         if (!lq_sta->search_better_tbl)
2063                 active_tbl = lq_sta->active_tbl;
2064         else
2065                 active_tbl = 1 - lq_sta->active_tbl;
2066
2067         tbl = &(lq_sta->lq_info[active_tbl]);
2068         rate = &tbl->rate;
2069
2070         if (prev_agg != lq_sta->is_agg) {
2071                 IWL_DEBUG_RATE(mvm,
2072                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2073                                prev_agg, lq_sta->is_agg);
2074                 rs_set_expected_tpt_table(lq_sta, tbl);
2075                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2076         }
2077
2078         /* current tx rate */
2079         index = lq_sta->last_txrate_idx;
2080
2081         /* rates available for this association, and for modulation mode */
2082         rate_mask = rs_get_supported_rates(lq_sta, rate);
2083
2084         if (!(BIT(index) & rate_mask)) {
2085                 IWL_ERR(mvm, "Current Rate is not valid\n");
2086                 if (lq_sta->search_better_tbl) {
2087                         /* revert to active table if search table is not valid*/
2088                         rate->type = LQ_NONE;
2089                         lq_sta->search_better_tbl = 0;
2090                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2091                         rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2092                 }
2093                 return;
2094         }
2095
2096         /* Get expected throughput table and history window for current rate */
2097         if (!tbl->expected_tpt) {
2098                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2099                 return;
2100         }
2101
2102         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2103         window = &(tbl->win[index]);
2104
2105         /*
2106          * If there is not enough history to calculate actual average
2107          * throughput, keep analyzing results of more tx frames, without
2108          * changing rate or mode (bypass most of the rest of this function).
2109          * Set up new rate table in uCode only if old rate is not supported
2110          * in current association (use new rate found above).
2111          */
2112         fail_count = window->counter - window->success_counter;
2113         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2114             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2115                 IWL_DEBUG_RATE(mvm,
2116                                "(%s: %d): Test Window: succ %d total %d\n",
2117                                rs_pretty_lq_type(rate->type),
2118                                index, window->success_counter, window->counter);
2119
2120                 /* Can't calculate this yet; not enough history */
2121                 window->average_tpt = IWL_INVALID_VALUE;
2122
2123                 /* Should we stay with this modulation mode,
2124                  * or search for a new one? */
2125                 rs_stay_in_table(lq_sta, false);
2126
2127                 goto out;
2128         }
2129         /* Else we have enough samples; calculate estimate of
2130          * actual average throughput */
2131         if (window->average_tpt != ((window->success_ratio *
2132                         tbl->expected_tpt[index] + 64) / 128)) {
2133                 window->average_tpt = ((window->success_ratio *
2134                                         tbl->expected_tpt[index] + 64) / 128);
2135         }
2136
2137         /* If we are searching for better modulation mode, check success. */
2138         if (lq_sta->search_better_tbl) {
2139                 /* If good success, continue using the "search" mode;
2140                  * no need to send new link quality command, since we're
2141                  * continuing to use the setup that we've been trying. */
2142                 if (window->average_tpt > lq_sta->last_tpt) {
2143                         IWL_DEBUG_RATE(mvm,
2144                                        "SWITCHING TO NEW TABLE SR: %d "
2145                                        "cur-tpt %d old-tpt %d\n",
2146                                        window->success_ratio,
2147                                        window->average_tpt,
2148                                        lq_sta->last_tpt);
2149
2150                         /* Swap tables; "search" becomes "active" */
2151                         lq_sta->active_tbl = active_tbl;
2152                         current_tpt = window->average_tpt;
2153                 /* Else poor success; go back to mode in "active" table */
2154                 } else {
2155                         IWL_DEBUG_RATE(mvm,
2156                                        "GOING BACK TO THE OLD TABLE: SR %d "
2157                                        "cur-tpt %d old-tpt %d\n",
2158                                        window->success_ratio,
2159                                        window->average_tpt,
2160                                        lq_sta->last_tpt);
2161
2162                         /* Nullify "search" table */
2163                         rate->type = LQ_NONE;
2164
2165                         /* Revert to "active" table */
2166                         active_tbl = lq_sta->active_tbl;
2167                         tbl = &(lq_sta->lq_info[active_tbl]);
2168
2169                         /* Revert to "active" rate and throughput info */
2170                         index = tbl->rate.index;
2171                         current_tpt = lq_sta->last_tpt;
2172
2173                         /* Need to set up a new rate table in uCode */
2174                         update_lq = 1;
2175                 }
2176
2177                 /* Either way, we've made a decision; modulation mode
2178                  * search is done, allow rate adjustment next time. */
2179                 lq_sta->search_better_tbl = 0;
2180                 done_search = 1;        /* Don't switch modes below! */
2181                 goto lq_update;
2182         }
2183
2184         /* (Else) not in search of better modulation mode, try for better
2185          * starting rate, while staying in this mode. */
2186         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2187         low = high_low & 0xff;
2188         high = (high_low >> 8) & 0xff;
2189
2190         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2191
2192         sr = window->success_ratio;
2193
2194         /* Collect measured throughputs for current and adjacent rates */
2195         current_tpt = window->average_tpt;
2196         if (low != IWL_RATE_INVALID)
2197                 low_tpt = tbl->win[low].average_tpt;
2198         if (high != IWL_RATE_INVALID)
2199                 high_tpt = tbl->win[high].average_tpt;
2200
2201         IWL_DEBUG_RATE(mvm,
2202                        "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2203                        rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2204                        low, high, low_tpt, high_tpt);
2205
2206         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2207                                           current_tpt, low_tpt, high_tpt);
2208
2209         /* Force a search in case BT doesn't like us being in MIMO */
2210         if (is_mimo(rate) &&
2211             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2212                 IWL_DEBUG_RATE(mvm,
2213                                "BT Coex forbids MIMO. Search for new config\n");
2214                 rs_stay_in_table(lq_sta, true);
2215                 goto lq_update;
2216         }
2217
2218         switch (scale_action) {
2219         case RS_ACTION_DOWNSCALE:
2220                 /* Decrease starting rate, update uCode's rate table */
2221                 if (low != IWL_RATE_INVALID) {
2222                         update_lq = 1;
2223                         index = low;
2224                 } else {
2225                         IWL_DEBUG_RATE(mvm,
2226                                        "At the bottom rate. Can't decrease\n");
2227                 }
2228
2229                 break;
2230         case RS_ACTION_UPSCALE:
2231                 /* Increase starting rate, update uCode's rate table */
2232                 if (high != IWL_RATE_INVALID) {
2233                         update_lq = 1;
2234                         index = high;
2235                 } else {
2236                         IWL_DEBUG_RATE(mvm,
2237                                        "At the top rate. Can't increase\n");
2238                 }
2239
2240                 break;
2241         case RS_ACTION_STAY:
2242                 /* No change */
2243                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2244                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2245                 break;
2246         default:
2247                 break;
2248         }
2249
2250 lq_update:
2251         /* Replace uCode's rate table for the destination station. */
2252         if (update_lq) {
2253                 tbl->rate.index = index;
2254                 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2255         }
2256
2257         rs_stay_in_table(lq_sta, false);
2258
2259         /*
2260          * Search for new modulation mode if we're:
2261          * 1)  Not changing rates right now
2262          * 2)  Not just finishing up a search
2263          * 3)  Allowing a new search
2264          */
2265         if (!update_lq && !done_search &&
2266             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2267             && window->counter) {
2268                 enum rs_column next_column;
2269
2270                 /* Save current throughput to compare with "search" throughput*/
2271                 lq_sta->last_tpt = current_tpt;
2272
2273                 IWL_DEBUG_RATE(mvm,
2274                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2275                                update_lq, done_search, lq_sta->rs_state,
2276                                window->counter);
2277
2278                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2279                 if (next_column != RS_COLUMN_INVALID) {
2280                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2281                                                       next_column);
2282                         if (!ret)
2283                                 lq_sta->search_better_tbl = 1;
2284                 } else {
2285                         IWL_DEBUG_RATE(mvm,
2286                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2287                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2288                 }
2289
2290                 /* If new "search" mode was selected, set up in uCode table */
2291                 if (lq_sta->search_better_tbl) {
2292                         /* Access the "search" table, clear its history. */
2293                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2294                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2295
2296                         /* Use new "search" start rate */
2297                         index = tbl->rate.index;
2298
2299                         rs_dump_rate(mvm, &tbl->rate,
2300                                      "Switch to SEARCH TABLE:");
2301                         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
2302                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2303                 } else {
2304                         done_search = 1;
2305                 }
2306         }
2307
2308         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2309                 /* If the "active" (non-search) mode was legacy,
2310                  * and we've tried switching antennas,
2311                  * but we haven't been able to try HT modes (not available),
2312                  * stay with best antenna legacy modulation for a while
2313                  * before next round of mode comparisons. */
2314                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2315                 if (is_legacy(&tbl1->rate)) {
2316                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2317
2318                         if (tid != IWL_MAX_TID_COUNT) {
2319                                 tid_data = &sta_priv->tid_data[tid];
2320                                 if (tid_data->state != IWL_AGG_OFF) {
2321                                         IWL_DEBUG_RATE(mvm,
2322                                                        "Stop aggregation on tid %d\n",
2323                                                        tid);
2324                                         ieee80211_stop_tx_ba_session(sta, tid);
2325                                 }
2326                         }
2327                         rs_set_stay_in_table(mvm, 1, lq_sta);
2328                 } else {
2329                 /* If we're in an HT mode, and all 3 mode switch actions
2330                  * have been tried and compared, stay in this best modulation
2331                  * mode for a while before next round of mode comparisons. */
2332                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2333                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2334                             (tid != IWL_MAX_TID_COUNT)) {
2335                                 tid_data = &sta_priv->tid_data[tid];
2336                                 if (tid_data->state == IWL_AGG_OFF) {
2337                                         IWL_DEBUG_RATE(mvm,
2338                                                        "try to aggregate tid %d\n",
2339                                                        tid);
2340                                         rs_tl_turn_on_agg(mvm, tid,
2341                                                           lq_sta, sta);
2342                                 }
2343                         }
2344                         rs_set_stay_in_table(mvm, 0, lq_sta);
2345                 }
2346         }
2347
2348 out:
2349         lq_sta->last_txrate_idx = index;
2350 }
2351
2352 struct rs_init_rate_info {
2353         s8 rssi;
2354         u8 rate_idx;
2355 };
2356
2357 static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
2358         { -60, IWL_RATE_54M_INDEX },
2359         { -64, IWL_RATE_48M_INDEX },
2360         { -68, IWL_RATE_36M_INDEX },
2361         { -80, IWL_RATE_24M_INDEX },
2362         { -84, IWL_RATE_18M_INDEX },
2363         { -85, IWL_RATE_12M_INDEX },
2364         { -86, IWL_RATE_11M_INDEX },
2365         { -88, IWL_RATE_5M_INDEX  },
2366         { -90, IWL_RATE_2M_INDEX  },
2367         { S8_MIN, IWL_RATE_1M_INDEX },
2368 };
2369
2370 static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
2371         { -60, IWL_RATE_54M_INDEX },
2372         { -64, IWL_RATE_48M_INDEX },
2373         { -72, IWL_RATE_36M_INDEX },
2374         { -80, IWL_RATE_24M_INDEX },
2375         { -84, IWL_RATE_18M_INDEX },
2376         { -85, IWL_RATE_12M_INDEX },
2377         { -87, IWL_RATE_9M_INDEX  },
2378         { S8_MIN, IWL_RATE_6M_INDEX },
2379 };
2380
2381 /* Choose an initial legacy rate and antenna to use based on the RSSI
2382  * of last Rx
2383  */
2384 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2385                                 struct iwl_lq_sta *lq_sta,
2386                                 enum ieee80211_band band,
2387                                 struct rs_rate *rate)
2388 {
2389         int i, nentries;
2390         s8 best_rssi = S8_MIN;
2391         u8 best_ant = ANT_NONE;
2392         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2393         const struct rs_init_rate_info *initial_rates;
2394
2395         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2396                 if (!(lq_sta->pers.chains & BIT(i)))
2397                         continue;
2398
2399                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2400                         best_rssi = lq_sta->pers.chain_signal[i];
2401                         best_ant = BIT(i);
2402                 }
2403         }
2404
2405         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2406                        rs_pretty_ant(best_ant), best_rssi);
2407
2408         if (best_ant != ANT_A && best_ant != ANT_B)
2409                 rate->ant = first_antenna(valid_tx_ant);
2410         else
2411                 rate->ant = best_ant;
2412
2413         rate->sgi = false;
2414         rate->ldpc = false;
2415         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2416
2417         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2418                                      BITS_PER_LONG);
2419
2420         if (band == IEEE80211_BAND_5GHZ) {
2421                 rate->type = LQ_LEGACY_A;
2422                 initial_rates = rs_init_rates_5ghz;
2423                 nentries = ARRAY_SIZE(rs_init_rates_5ghz);
2424         } else {
2425                 rate->type = LQ_LEGACY_G;
2426                 initial_rates = rs_init_rates_24ghz;
2427                 nentries = ARRAY_SIZE(rs_init_rates_24ghz);
2428         }
2429
2430         if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2431                 for (i = 0; i < nentries; i++) {
2432                         int rate_idx = initial_rates[i].rate_idx;
2433                         if ((best_rssi >= initial_rates[i].rssi) &&
2434                             (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2435                                 rate->index = rate_idx;
2436                                 break;
2437                         }
2438                 }
2439         }
2440
2441         IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2442                        rs_pretty_ant(rate->ant));
2443 }
2444
2445 /* Save info about RSSI of last Rx */
2446 void rs_update_last_rssi(struct iwl_mvm *mvm,
2447                          struct iwl_lq_sta *lq_sta,
2448                          struct ieee80211_rx_status *rx_status)
2449 {
2450         lq_sta->pers.chains = rx_status->chains;
2451         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2452         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2453         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2454 }
2455
2456 /**
2457  * rs_initialize_lq - Initialize a station's hardware rate table
2458  *
2459  * The uCode's station table contains a table of fallback rates
2460  * for automatic fallback during transmission.
2461  *
2462  * NOTE: This sets up a default set of values.  These will be replaced later
2463  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2464  *       rc80211_simple.
2465  *
2466  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2467  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2468  *       which requires station table entry to exist).
2469  */
2470 static void rs_initialize_lq(struct iwl_mvm *mvm,
2471                              struct ieee80211_sta *sta,
2472                              struct iwl_lq_sta *lq_sta,
2473                              enum ieee80211_band band,
2474                              bool init)
2475 {
2476         struct iwl_scale_tbl_info *tbl;
2477         struct rs_rate *rate;
2478         u8 active_tbl = 0;
2479
2480         if (!sta || !lq_sta)
2481                 return;
2482
2483         if (!lq_sta->search_better_tbl)
2484                 active_tbl = lq_sta->active_tbl;
2485         else
2486                 active_tbl = 1 - lq_sta->active_tbl;
2487
2488         tbl = &(lq_sta->lq_info[active_tbl]);
2489         rate = &tbl->rate;
2490
2491         rs_get_initial_rate(mvm, lq_sta, band, rate);
2492         lq_sta->last_txrate_idx = rate->index;
2493
2494         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2495         if (rate->ant == ANT_A)
2496                 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2497         else
2498                 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2499
2500         rs_set_expected_tpt_table(lq_sta, tbl);
2501         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2502         /* TODO restore station should remember the lq cmd */
2503         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2504 }
2505
2506 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2507                         struct ieee80211_tx_rate_control *txrc)
2508 {
2509         struct sk_buff *skb = txrc->skb;
2510         struct iwl_op_mode *op_mode __maybe_unused =
2511                         (struct iwl_op_mode *)mvm_r;
2512         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2513         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2514         struct iwl_lq_sta *lq_sta = mvm_sta;
2515
2516         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2517
2518         /* Treat uninitialized rate scaling data same as non-existing. */
2519         if (lq_sta && !lq_sta->pers.drv) {
2520                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2521                 mvm_sta = NULL;
2522         }
2523
2524         /* Send management frames and NO_ACK data using lowest rate. */
2525         if (rate_control_send_low(sta, mvm_sta, txrc))
2526                 return;
2527
2528         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2529                                   info->band, &info->control.rates[0]);
2530
2531         info->control.rates[0].count = 1;
2532 }
2533
2534 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2535                           gfp_t gfp)
2536 {
2537         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2538         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2539         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2540         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2541
2542         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2543
2544         lq_sta->pers.drv = mvm;
2545 #ifdef CONFIG_MAC80211_DEBUGFS
2546         lq_sta->pers.dbg_fixed_rate = 0;
2547         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2548 #endif
2549         lq_sta->pers.chains = 0;
2550         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2551
2552         return &sta_priv->lq_sta;
2553 }
2554
2555 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2556                                        int nss)
2557 {
2558         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2559                 (0x3 << (2 * (nss - 1)));
2560         rx_mcs >>= (2 * (nss - 1));
2561
2562         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2563                 return IWL_RATE_MCS_7_INDEX;
2564         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2565                 return IWL_RATE_MCS_8_INDEX;
2566         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2567                 return IWL_RATE_MCS_9_INDEX;
2568
2569         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2570         return -1;
2571 }
2572
2573 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2574                                      struct ieee80211_sta_vht_cap *vht_cap,
2575                                      struct iwl_lq_sta *lq_sta)
2576 {
2577         int i;
2578         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2579
2580         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2581                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2582                         if (i == IWL_RATE_9M_INDEX)
2583                                 continue;
2584
2585                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2586                         if (i == IWL_RATE_MCS_9_INDEX &&
2587                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2588                                 continue;
2589
2590                         lq_sta->active_siso_rate |= BIT(i);
2591                 }
2592         }
2593
2594         if (sta->rx_nss < 2)
2595                 return;
2596
2597         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2598         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2599                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2600                         if (i == IWL_RATE_9M_INDEX)
2601                                 continue;
2602
2603                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2604                         if (i == IWL_RATE_MCS_9_INDEX &&
2605                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2606                                 continue;
2607
2608                         lq_sta->active_mimo2_rate |= BIT(i);
2609                 }
2610         }
2611 }
2612
2613 #ifdef CONFIG_IWLWIFI_DEBUGFS
2614 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm,
2615                                       struct iwl_mvm_frame_stats *stats)
2616 {
2617         spin_lock_bh(&mvm->drv_stats_lock);
2618         memset(stats, 0, sizeof(*stats));
2619         spin_unlock_bh(&mvm->drv_stats_lock);
2620 }
2621
2622 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm,
2623                                 struct iwl_mvm_frame_stats *stats,
2624                                 u32 rate, bool agg)
2625 {
2626         u8 nss = 0, mcs = 0;
2627
2628         spin_lock(&mvm->drv_stats_lock);
2629
2630         if (agg)
2631                 stats->agg_frames++;
2632
2633         stats->success_frames++;
2634
2635         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2636         case RATE_MCS_CHAN_WIDTH_20:
2637                 stats->bw_20_frames++;
2638                 break;
2639         case RATE_MCS_CHAN_WIDTH_40:
2640                 stats->bw_40_frames++;
2641                 break;
2642         case RATE_MCS_CHAN_WIDTH_80:
2643                 stats->bw_80_frames++;
2644                 break;
2645         default:
2646                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2647         }
2648
2649         if (rate & RATE_MCS_HT_MSK) {
2650                 stats->ht_frames++;
2651                 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2652                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2653         } else if (rate & RATE_MCS_VHT_MSK) {
2654                 stats->vht_frames++;
2655                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2656                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2657                        RATE_VHT_MCS_NSS_POS) + 1;
2658         } else {
2659                 stats->legacy_frames++;
2660         }
2661
2662         if (nss == 1)
2663                 stats->siso_frames++;
2664         else if (nss == 2)
2665                 stats->mimo2_frames++;
2666
2667         if (rate & RATE_MCS_SGI_MSK)
2668                 stats->sgi_frames++;
2669         else
2670                 stats->ngi_frames++;
2671
2672         stats->last_rates[stats->last_frame_idx] = rate;
2673         stats->last_frame_idx = (stats->last_frame_idx + 1) %
2674                 ARRAY_SIZE(stats->last_rates);
2675
2676         spin_unlock(&mvm->drv_stats_lock);
2677 }
2678 #endif
2679
2680 /*
2681  * Called after adding a new station to initialize rate scaling
2682  */
2683 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2684                           enum ieee80211_band band, bool init)
2685 {
2686         int i, j;
2687         struct ieee80211_hw *hw = mvm->hw;
2688         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2689         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2690         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2691         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2692         struct ieee80211_supported_band *sband;
2693         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2694
2695         /* clear all non-persistent lq data */
2696         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2697
2698         sband = hw->wiphy->bands[band];
2699
2700         lq_sta->lq.sta_id = sta_priv->sta_id;
2701
2702         for (j = 0; j < LQ_SIZE; j++)
2703                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2704
2705         lq_sta->flush_timer = 0;
2706         lq_sta->last_tx = jiffies;
2707
2708         IWL_DEBUG_RATE(mvm,
2709                        "LQ: *** rate scale station global init for station %d ***\n",
2710                        sta_priv->sta_id);
2711         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2712          * the lowest or the highest rate.. Could consider using RSSI from
2713          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2714          * after assoc.. */
2715
2716         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2717         lq_sta->band = sband->band;
2718         /*
2719          * active legacy rates as per supported rates bitmap
2720          */
2721         supp = sta->supp_rates[sband->band];
2722         lq_sta->active_legacy_rate = 0;
2723         for_each_set_bit(i, &supp, BITS_PER_LONG)
2724                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2725
2726         /* TODO: should probably account for rx_highest for both HT/VHT */
2727         if (!vht_cap || !vht_cap->vht_supported) {
2728                 /* active_siso_rate mask includes 9 MBits (bit 5),
2729                  * and CCK (bits 0-3), supp_rates[] does not;
2730                  * shift to convert format, force 9 MBits off.
2731                  */
2732                 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2733                 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2734                 lq_sta->active_siso_rate &= ~((u16)0x2);
2735                 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2736
2737                 /* Same here */
2738                 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2739                 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2740                 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2741                 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2742
2743                 lq_sta->is_vht = false;
2744                 if (mvm->cfg->ht_params->ldpc &&
2745                     (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2746                         lq_sta->ldpc = true;
2747
2748                 if (mvm->cfg->ht_params->stbc &&
2749                     (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2750                     (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2751                         lq_sta->stbc = true;
2752         } else {
2753                 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2754                 lq_sta->is_vht = true;
2755
2756                 if (mvm->cfg->ht_params->ldpc &&
2757                     (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2758                         lq_sta->ldpc = true;
2759
2760                 if (mvm->cfg->ht_params->stbc &&
2761                     (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2762                     (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2763                         lq_sta->stbc = true;
2764         }
2765
2766         if (IWL_MVM_RS_DISABLE_MIMO)
2767                 lq_sta->active_mimo2_rate = 0;
2768
2769         lq_sta->max_legacy_rate_idx =
2770                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2771         lq_sta->max_siso_rate_idx =
2772                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2773         lq_sta->max_mimo2_rate_idx =
2774                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2775
2776         IWL_DEBUG_RATE(mvm,
2777                        "RATE MASK: LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC%d\n",
2778                        lq_sta->active_legacy_rate,
2779                        lq_sta->active_siso_rate,
2780                        lq_sta->active_mimo2_rate,
2781                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc);
2782         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2783                        lq_sta->max_legacy_rate_idx,
2784                        lq_sta->max_siso_rate_idx,
2785                        lq_sta->max_mimo2_rate_idx);
2786
2787         /* These values will be overridden later */
2788         lq_sta->lq.single_stream_ant_msk =
2789                 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
2790         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2791
2792         /* as default allow aggregation for all tids */
2793         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2794         lq_sta->is_agg = 0;
2795 #ifdef CONFIG_IWLWIFI_DEBUGFS
2796         iwl_mvm_reset_frame_stats(mvm, &mvm->drv_rx_stats);
2797 #endif
2798         rs_initialize_lq(mvm, sta, lq_sta, band, init);
2799 }
2800
2801 static void rs_rate_update(void *mvm_r,
2802                            struct ieee80211_supported_band *sband,
2803                            struct cfg80211_chan_def *chandef,
2804                            struct ieee80211_sta *sta, void *priv_sta,
2805                            u32 changed)
2806 {
2807         u8 tid;
2808         struct iwl_op_mode *op_mode  =
2809                         (struct iwl_op_mode *)mvm_r;
2810         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2811
2812         /* Stop any ongoing aggregations as rs starts off assuming no agg */
2813         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2814                 ieee80211_stop_tx_ba_session(sta, tid);
2815
2816         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2817 }
2818
2819 #ifdef CONFIG_MAC80211_DEBUGFS
2820 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2821                                             struct iwl_lq_cmd *lq_cmd,
2822                                             enum ieee80211_band band,
2823                                             u32 ucode_rate)
2824 {
2825         struct rs_rate rate;
2826         int i;
2827         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2828         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2829         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2830
2831         for (i = 0; i < num_rates; i++)
2832                 lq_cmd->rs_table[i] = ucode_rate_le32;
2833
2834         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2835
2836         if (is_mimo(&rate))
2837                 lq_cmd->mimo_delim = num_rates - 1;
2838         else
2839                 lq_cmd->mimo_delim = 0;
2840
2841         lq_cmd->reduced_tpc = 0;
2842
2843         if (num_of_ant(ant) == 1)
2844                 lq_cmd->single_stream_ant_msk = ant;
2845
2846         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2847 }
2848 #endif /* CONFIG_MAC80211_DEBUGFS */
2849
2850 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2851                                      struct iwl_lq_sta *lq_sta,
2852                                      struct rs_rate *rate,
2853                                      __le32 *rs_table, int *rs_table_index,
2854                                      int num_rates, int num_retries,
2855                                      u8 valid_tx_ant, bool toggle_ant)
2856 {
2857         int i, j;
2858         __le32 ucode_rate;
2859         bool bottom_reached = false;
2860         int prev_rate_idx = rate->index;
2861         int end = LINK_QUAL_MAX_RETRY_NUM;
2862         int index = *rs_table_index;
2863
2864         for (i = 0; i < num_rates && index < end; i++) {
2865                 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, rate));
2866                 for (j = 0; j < num_retries && index < end; j++, index++)
2867                         rs_table[index] = ucode_rate;
2868
2869                 if (toggle_ant)
2870                         rs_toggle_antenna(valid_tx_ant, rate);
2871
2872                 prev_rate_idx = rate->index;
2873                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2874                 if (bottom_reached && !is_legacy(rate))
2875                         break;
2876         }
2877
2878         if (!bottom_reached)
2879                 rate->index = prev_rate_idx;
2880
2881         *rs_table_index = index;
2882 }
2883
2884 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2885  * column the rate table should look like this:
2886  *
2887  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2888  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2889  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2890  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2891  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2892  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2893  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2894  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2895  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2896  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2897  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2898  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2899  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2900  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2901  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2902  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2903  */
2904 static void rs_build_rates_table(struct iwl_mvm *mvm,
2905                                  struct ieee80211_sta *sta,
2906                                  struct iwl_lq_sta *lq_sta,
2907                                  const struct rs_rate *initial_rate)
2908 {
2909         struct rs_rate rate;
2910         int num_rates, num_retries, index = 0;
2911         u8 valid_tx_ant = 0;
2912         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2913         bool toggle_ant = false;
2914
2915         memcpy(&rate, initial_rate, sizeof(rate));
2916
2917         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2918         rate.stbc = rs_stbc_allow(mvm, sta, lq_sta);
2919
2920         if (is_siso(&rate)) {
2921                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
2922                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
2923         } else if (is_mimo(&rate)) {
2924                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
2925                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
2926         } else {
2927                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
2928                 num_retries = IWL_MVM_RS_LEGACY_RETRIES_PER_RATE;
2929                 toggle_ant = true;
2930         }
2931
2932         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2933                                  num_rates, num_retries, valid_tx_ant,
2934                                  toggle_ant);
2935
2936         rs_get_lower_rate_down_column(lq_sta, &rate);
2937
2938         if (is_siso(&rate)) {
2939                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
2940                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
2941                 lq_cmd->mimo_delim = index;
2942         } else if (is_legacy(&rate)) {
2943                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
2944                 num_retries = IWL_MVM_RS_LEGACY_RETRIES_PER_RATE;
2945         } else {
2946                 WARN_ON_ONCE(1);
2947         }
2948
2949         toggle_ant = true;
2950
2951         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2952                                  num_rates, num_retries, valid_tx_ant,
2953                                  toggle_ant);
2954
2955         rs_get_lower_rate_down_column(lq_sta, &rate);
2956
2957         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
2958         num_retries = IWL_MVM_RS_LEGACY_RETRIES_PER_RATE;
2959
2960         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2961                                  num_rates, num_retries, valid_tx_ant,
2962                                  toggle_ant);
2963
2964 }
2965
2966 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
2967                            struct ieee80211_sta *sta,
2968                            struct iwl_lq_sta *lq_sta,
2969                            const struct rs_rate *initial_rate)
2970 {
2971         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2972         struct iwl_mvm_sta *mvmsta;
2973         struct iwl_mvm_vif *mvmvif;
2974
2975         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
2976         lq_cmd->agg_time_limit =
2977                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
2978
2979 #ifdef CONFIG_MAC80211_DEBUGFS
2980         if (lq_sta->pers.dbg_fixed_rate) {
2981                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
2982                                                 lq_sta->band,
2983                                                 lq_sta->pers.dbg_fixed_rate);
2984                 return;
2985         }
2986 #endif
2987         if (WARN_ON_ONCE(!sta || !initial_rate))
2988                 return;
2989
2990         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
2991
2992         if (num_of_ant(initial_rate->ant) == 1)
2993                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
2994
2995         mvmsta = iwl_mvm_sta_from_mac80211(sta);
2996         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
2997
2998         if (num_of_ant(initial_rate->ant) == 1)
2999                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3000
3001         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3002
3003         /*
3004          * In case of low latency, tell the firwmare to leave a frame in the
3005          * Tx Fifo so that it can start a transaction in the same TxOP. This
3006          * basically allows the firmware to send bursts.
3007          */
3008         if (iwl_mvm_vif_low_latency(mvmvif)) {
3009                 lq_cmd->agg_frame_cnt_limit--;
3010
3011                 if (mvm->low_latency_agg_frame_limit)
3012                         lq_cmd->agg_frame_cnt_limit =
3013                                 min(lq_cmd->agg_frame_cnt_limit,
3014                                     mvm->low_latency_agg_frame_limit);
3015         }
3016
3017         if (mvmsta->vif->p2p)
3018                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3019
3020         lq_cmd->agg_time_limit =
3021                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3022 }
3023
3024 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3025 {
3026         return hw->priv;
3027 }
3028 /* rate scale requires free function to be implemented */
3029 static void rs_free(void *mvm_rate)
3030 {
3031         return;
3032 }
3033
3034 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3035                         void *mvm_sta)
3036 {
3037         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3038         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3039
3040         IWL_DEBUG_RATE(mvm, "enter\n");
3041         IWL_DEBUG_RATE(mvm, "leave\n");
3042 }
3043
3044 #ifdef CONFIG_MAC80211_DEBUGFS
3045 int rs_pretty_print_rate(char *buf, const u32 rate)
3046 {
3047
3048         char *type, *bw;
3049         u8 mcs = 0, nss = 0;
3050         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3051
3052         if (!(rate & RATE_MCS_HT_MSK) &&
3053             !(rate & RATE_MCS_VHT_MSK)) {
3054                 int index = iwl_hwrate_to_plcp_idx(rate);
3055
3056                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3057                                rs_pretty_ant(ant),
3058                                index == IWL_RATE_INVALID ? "BAD" :
3059                                iwl_rate_mcs[index].mbps);
3060         }
3061
3062         if (rate & RATE_MCS_VHT_MSK) {
3063                 type = "VHT";
3064                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3065                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3066                        >> RATE_VHT_MCS_NSS_POS) + 1;
3067         } else if (rate & RATE_MCS_HT_MSK) {
3068                 type = "HT";
3069                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3070         } else {
3071                 type = "Unknown"; /* shouldn't happen */
3072         }
3073
3074         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3075         case RATE_MCS_CHAN_WIDTH_20:
3076                 bw = "20Mhz";
3077                 break;
3078         case RATE_MCS_CHAN_WIDTH_40:
3079                 bw = "40Mhz";
3080                 break;
3081         case RATE_MCS_CHAN_WIDTH_80:
3082                 bw = "80Mhz";
3083                 break;
3084         case RATE_MCS_CHAN_WIDTH_160:
3085                 bw = "160Mhz";
3086                 break;
3087         default:
3088                 bw = "BAD BW";
3089         }
3090
3091         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3092                        type, rs_pretty_ant(ant), bw, mcs, nss,
3093                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3094                        (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3095                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3096                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3097                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3098 }
3099
3100 /**
3101  * Program the device to use fixed rate for frame transmit
3102  * This is for debugging/testing only
3103  * once the device start use fixed rate, we need to reload the module
3104  * to being back the normal operation.
3105  */
3106 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3107                                 struct iwl_lq_sta *lq_sta)
3108 {
3109         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3110         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3111         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3112
3113         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3114                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3115
3116         if (lq_sta->pers.dbg_fixed_rate) {
3117                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3118                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3119         }
3120 }
3121
3122 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3123                         const char __user *user_buf, size_t count, loff_t *ppos)
3124 {
3125         struct iwl_lq_sta *lq_sta = file->private_data;
3126         struct iwl_mvm *mvm;
3127         char buf[64];
3128         size_t buf_size;
3129         u32 parsed_rate;
3130
3131         mvm = lq_sta->pers.drv;
3132         memset(buf, 0, sizeof(buf));
3133         buf_size = min(count, sizeof(buf) -  1);
3134         if (copy_from_user(buf, user_buf, buf_size))
3135                 return -EFAULT;
3136
3137         if (sscanf(buf, "%x", &parsed_rate) == 1)
3138                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3139         else
3140                 lq_sta->pers.dbg_fixed_rate = 0;
3141
3142         rs_program_fix_rate(mvm, lq_sta);
3143
3144         return count;
3145 }
3146
3147 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3148                         char __user *user_buf, size_t count, loff_t *ppos)
3149 {
3150         char *buff;
3151         int desc = 0;
3152         int i = 0;
3153         ssize_t ret;
3154
3155         struct iwl_lq_sta *lq_sta = file->private_data;
3156         struct iwl_mvm *mvm;
3157         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3158         struct rs_rate *rate = &tbl->rate;
3159         mvm = lq_sta->pers.drv;
3160         buff = kmalloc(2048, GFP_KERNEL);
3161         if (!buff)
3162                 return -ENOMEM;
3163
3164         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3165         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3166                         lq_sta->total_failed, lq_sta->total_success,
3167                         lq_sta->active_legacy_rate);
3168         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3169                         lq_sta->pers.dbg_fixed_rate);
3170         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3171             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3172             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3173             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3174         desc += sprintf(buff+desc, "lq type %s\n",
3175                         (is_legacy(rate)) ? "legacy" :
3176                         is_vht(rate) ? "VHT" : "HT");
3177         if (!is_legacy(rate)) {
3178                 desc += sprintf(buff+desc, " %s",
3179                    (is_siso(rate)) ? "SISO" : "MIMO2");
3180                    desc += sprintf(buff+desc, " %s",
3181                                    (is_ht20(rate)) ? "20MHz" :
3182                                    (is_ht40(rate)) ? "40MHz" :
3183                                    (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3184                    desc += sprintf(buff+desc, " %s %s %s\n",
3185                                    (rate->sgi) ? "SGI" : "NGI",
3186                                    (rate->ldpc) ? "LDPC" : "BCC",
3187                                    (lq_sta->is_agg) ? "AGG on" : "");
3188         }
3189         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3190                         lq_sta->last_rate_n_flags);
3191         desc += sprintf(buff+desc,
3192                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3193                         lq_sta->lq.flags,
3194                         lq_sta->lq.mimo_delim,
3195                         lq_sta->lq.single_stream_ant_msk,
3196                         lq_sta->lq.dual_stream_ant_msk);
3197
3198         desc += sprintf(buff+desc,
3199                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3200                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3201                         lq_sta->lq.agg_disable_start_th,
3202                         lq_sta->lq.agg_frame_cnt_limit);
3203
3204         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3205         desc += sprintf(buff+desc,
3206                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3207                         lq_sta->lq.initial_rate_index[0],
3208                         lq_sta->lq.initial_rate_index[1],
3209                         lq_sta->lq.initial_rate_index[2],
3210                         lq_sta->lq.initial_rate_index[3]);
3211
3212         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3213                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3214
3215                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3216                 desc += rs_pretty_print_rate(buff+desc, r);
3217         }
3218
3219         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3220         kfree(buff);
3221         return ret;
3222 }
3223
3224 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3225         .write = rs_sta_dbgfs_scale_table_write,
3226         .read = rs_sta_dbgfs_scale_table_read,
3227         .open = simple_open,
3228         .llseek = default_llseek,
3229 };
3230 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3231                         char __user *user_buf, size_t count, loff_t *ppos)
3232 {
3233         char *buff;
3234         int desc = 0;
3235         int i, j;
3236         ssize_t ret;
3237         struct iwl_scale_tbl_info *tbl;
3238         struct rs_rate *rate;
3239         struct iwl_lq_sta *lq_sta = file->private_data;
3240
3241         buff = kmalloc(1024, GFP_KERNEL);
3242         if (!buff)
3243                 return -ENOMEM;
3244
3245         for (i = 0; i < LQ_SIZE; i++) {
3246                 tbl = &(lq_sta->lq_info[i]);
3247                 rate = &tbl->rate;
3248                 desc += sprintf(buff+desc,
3249                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3250                                 "index=%d\n",
3251                                 lq_sta->active_tbl == i ? "*" : "x",
3252                                 rate->type,
3253                                 rate->sgi,
3254                                 is_ht20(rate) ? "20Mhz" :
3255                                 is_ht40(rate) ? "40Mhz" :
3256                                 is_ht80(rate) ? "80Mhz" : "ERR",
3257                                 rate->index);
3258                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3259                         desc += sprintf(buff+desc,
3260                                 "counter=%d success=%d %%=%d\n",
3261                                 tbl->win[j].counter,
3262                                 tbl->win[j].success_counter,
3263                                 tbl->win[j].success_ratio);
3264                 }
3265         }
3266         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3267         kfree(buff);
3268         return ret;
3269 }
3270
3271 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3272         .read = rs_sta_dbgfs_stats_table_read,
3273         .open = simple_open,
3274         .llseek = default_llseek,
3275 };
3276
3277 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3278                                               char __user *user_buf,
3279                                               size_t count, loff_t *ppos)
3280 {
3281         static const char * const column_name[] = {
3282                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3283                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3284                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3285                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3286                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3287                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3288                 [RS_COLUMN_MIMO2] = "MIMO2",
3289                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3290         };
3291
3292         static const char * const rate_name[] = {
3293                 [IWL_RATE_1M_INDEX] = "1M",
3294                 [IWL_RATE_2M_INDEX] = "2M",
3295                 [IWL_RATE_5M_INDEX] = "5.5M",
3296                 [IWL_RATE_11M_INDEX] = "11M",
3297                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3298                 [IWL_RATE_9M_INDEX] = "9M",
3299                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3300                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3301                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3302                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3303                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3304                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3305                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3306                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3307                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3308         };
3309
3310         char *buff, *pos, *endpos;
3311         int col, rate;
3312         ssize_t ret;
3313         struct iwl_lq_sta *lq_sta = file->private_data;
3314         struct rs_rate_stats *stats;
3315         static const size_t bufsz = 1024;
3316
3317         buff = kmalloc(bufsz, GFP_KERNEL);
3318         if (!buff)
3319                 return -ENOMEM;
3320
3321         pos = buff;
3322         endpos = pos + bufsz;
3323
3324         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3325         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3326                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3327         pos += scnprintf(pos, endpos - pos, "\n");
3328
3329         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3330                 pos += scnprintf(pos, endpos - pos,
3331                                  "%s,", column_name[col]);
3332
3333                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3334                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3335                         pos += scnprintf(pos, endpos - pos,
3336                                          "%llu/%llu,",
3337                                          stats->success,
3338                                          stats->total);
3339                 }
3340                 pos += scnprintf(pos, endpos - pos, "\n");
3341         }
3342
3343         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3344         kfree(buff);
3345         return ret;
3346 }
3347
3348 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3349                                                const char __user *user_buf,
3350                                                size_t count, loff_t *ppos)
3351 {
3352         struct iwl_lq_sta *lq_sta = file->private_data;
3353         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3354
3355         return count;
3356 }
3357
3358 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3359         .read = rs_sta_dbgfs_drv_tx_stats_read,
3360         .write = rs_sta_dbgfs_drv_tx_stats_write,
3361         .open = simple_open,
3362         .llseek = default_llseek,
3363 };
3364
3365 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3366 {
3367         struct iwl_lq_sta *lq_sta = mvm_sta;
3368         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3369                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
3370         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3371                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
3372         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3373                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3374         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3375                           &lq_sta->tx_agg_tid_en);
3376         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3377                           &lq_sta->pers.dbg_fixed_txp_reduction);
3378 }
3379
3380 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3381 {
3382 }
3383 #endif
3384
3385 /*
3386  * Initialization of rate scaling information is done by driver after
3387  * the station is added. Since mac80211 calls this function before a
3388  * station is added we ignore it.
3389  */
3390 static void rs_rate_init_stub(void *mvm_r,
3391                               struct ieee80211_supported_band *sband,
3392                               struct cfg80211_chan_def *chandef,
3393                               struct ieee80211_sta *sta, void *mvm_sta)
3394 {
3395 }
3396
3397 static const struct rate_control_ops rs_mvm_ops = {
3398         .name = RS_NAME,
3399         .tx_status = rs_mac80211_tx_status,
3400         .get_rate = rs_get_rate,
3401         .rate_init = rs_rate_init_stub,
3402         .alloc = rs_alloc,
3403         .free = rs_free,
3404         .alloc_sta = rs_alloc_sta,
3405         .free_sta = rs_free_sta,
3406         .rate_update = rs_rate_update,
3407 #ifdef CONFIG_MAC80211_DEBUGFS
3408         .add_sta_debugfs = rs_add_debugfs,
3409         .remove_sta_debugfs = rs_remove_debugfs,
3410 #endif
3411 };
3412
3413 int iwl_mvm_rate_control_register(void)
3414 {
3415         return ieee80211_rate_control_register(&rs_mvm_ops);
3416 }
3417
3418 void iwl_mvm_rate_control_unregister(void)
3419 {
3420         ieee80211_rate_control_unregister(&rs_mvm_ops);
3421 }
3422
3423 /**
3424  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3425  * Tx protection, according to this rquest and previous requests,
3426  * and send the LQ command.
3427  * @mvmsta: The station
3428  * @enable: Enable Tx protection?
3429  */
3430 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3431                           bool enable)
3432 {
3433         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3434
3435         lockdep_assert_held(&mvm->mutex);
3436
3437         if (enable) {
3438                 if (mvmsta->tx_protection == 0)
3439                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
3440                 mvmsta->tx_protection++;
3441         } else {
3442                 mvmsta->tx_protection--;
3443                 if (mvmsta->tx_protection == 0)
3444                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3445         }
3446
3447         return iwl_mvm_send_lq_cmd(mvm, lq, false);
3448 }