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         }
 921
 922         high = index;
 923         while (high != IWL_RATE_INVALID) {
 924                 high = iwl_rates[high].next_rs;
 925                 if (high == IWL_RATE_INVALID)
 926                         break;
 927                 if (rate_mask & (1 << high))
 928                         break;
 929         }
 930
 931         return (high << 8) | low;
 932 }
 933
 934 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
 935                                      struct rs_rate *rate)
 936 {
 937         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
 938 }
 939
 940 /* Get the next supported lower rate in the current column.
 941  * Return true if bottom rate in the current column was reached
 942  */
 943 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
 944                                         struct rs_rate *rate)
 945 {
 946         u8 low;
 947         u16 high_low;
 948         u16 rate_mask;
 949         struct iwl_mvm *mvm = lq_sta->pers.drv;
 950
 951         rate_mask = rs_get_supported_rates(lq_sta, rate);
 952         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
 953                                         rate->type);
 954         low = high_low & 0xff;
 955
 956         /* Bottom rate of column reached */
 957         if (low == IWL_RATE_INVALID)
 958                 return true;
 959
 960         rate->index = low;
 961         return false;
 962 }
 963
 964 /* Get the next rate to use following a column downgrade */
 965 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
 966                                           struct rs_rate *rate)
 967 {
 968         struct iwl_mvm *mvm = lq_sta->pers.drv;
 969
 970         if (is_legacy(rate)) {
 971                 /* No column to downgrade from Legacy */
 972                 return;
 973         } else if (is_siso(rate)) {
 974                 /* Downgrade to Legacy if we were in SISO */
 975                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 976                         rate->type = LQ_LEGACY_A;
 977                 else
 978                         rate->type = LQ_LEGACY_G;
 979
 980                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
 981
 982                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
 983                              rate->index > IWL_RATE_MCS_9_INDEX);
 984
 985                 rate->index = rs_ht_to_legacy[rate->index];
 986                 rate->ldpc = false;
 987         } else {
 988                 /* Downgrade to SISO with same MCS if in MIMO  */
 989                 rate->type = is_vht_mimo2(rate) ?
 990                         LQ_VHT_SISO : LQ_HT_SISO;
 991         }
 992
 993         if (num_of_ant(rate->ant) > 1)
 994                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
 995
 996         /* Relevant in both switching to SISO or Legacy */
 997         rate->sgi = false;
 998
 999         if (!rs_rate_supported(lq_sta, rate))
1000                 rs_get_lower_rate_in_column(lq_sta, rate);
1001 }
1002
1003 /* Simple function to compare two rate scale table types */
1004 static inline bool rs_rate_match(struct rs_rate *a,
1005                                  struct rs_rate *b)
1006 {
1007         bool ant_match;
1008
1009         if (a->stbc)
1010                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1011         else
1012                 ant_match = (a->ant == b->ant);
1013
1014         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1015                 && ant_match;
1016 }
1017
1018 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
1019 {
1020         if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
1021                 return RATE_MCS_CHAN_WIDTH_40;
1022         else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
1023                 return RATE_MCS_CHAN_WIDTH_80;
1024         else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
1025                 return RATE_MCS_CHAN_WIDTH_160;
1026
1027         return RATE_MCS_CHAN_WIDTH_20;
1028 }
1029
1030 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1031 {
1032         u8 tid = IWL_MAX_TID_COUNT;
1033
1034         if (ieee80211_is_data_qos(hdr->frame_control)) {
1035                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1036                 tid = qc[0] & 0xf;
1037         }
1038
1039         if (unlikely(tid > IWL_MAX_TID_COUNT))
1040                 tid = IWL_MAX_TID_COUNT;
1041
1042         return tid;
1043 }
1044
1045 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1046                           int tid, struct ieee80211_tx_info *info)
1047 {
1048         int legacy_success;
1049         int retries;
1050         int mac_index, i;
1051         struct iwl_lq_cmd *table;
1052         enum mac80211_rate_control_flags mac_flags;
1053         u32 ucode_rate;
1054         struct rs_rate rate;
1055         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1056         u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1057         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1058         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1059
1060         /* Treat uninitialized rate scaling data same as non-existing. */
1061         if (!lq_sta) {
1062                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1063                 return;
1064         } else if (!lq_sta->pers.drv) {
1065                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1066                 return;
1067         }
1068
1069 #ifdef CONFIG_MAC80211_DEBUGFS
1070         /* Disable last tx check if we are debugging with fixed rate */
1071         if (lq_sta->pers.dbg_fixed_rate) {
1072                 IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n");
1073                 return;
1074         }
1075 #endif
1076         /* This packet was aggregated but doesn't carry status info */
1077         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1078             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1079                 return;
1080
1081         /*
1082          * Ignore this Tx frame response if its initial rate doesn't match
1083          * that of latest Link Quality command.  There may be stragglers
1084          * from a previous Link Quality command, but we're no longer interested
1085          * in those; they're either from the "active" mode while we're trying
1086          * to check "search" mode, or a prior "search" mode after we've moved
1087          * to a new "search" mode (which might become the new "active" mode).
1088          */
1089         table = &lq_sta->lq;
1090         ucode_rate = le32_to_cpu(table->rs_table[0]);
1091         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1092         if (info->band == IEEE80211_BAND_5GHZ)
1093                 rate.index -= IWL_FIRST_OFDM_RATE;
1094         mac_flags = info->status.rates[0].flags;
1095         mac_index = info->status.rates[0].idx;
1096         /* For HT packets, map MCS to PLCP */
1097         if (mac_flags & IEEE80211_TX_RC_MCS) {
1098                 /* Remove # of streams */
1099                 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1100                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1101                         mac_index++;
1102                 /*
1103                  * mac80211 HT index is always zero-indexed; we need to move
1104                  * HT OFDM rates after CCK rates in 2.4 GHz band
1105                  */
1106                 if (info->band == IEEE80211_BAND_2GHZ)
1107                         mac_index += IWL_FIRST_OFDM_RATE;
1108         } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1109                 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1110                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1111                         mac_index++;
1112         }
1113
1114         if (time_after(jiffies,
1115                        (unsigned long)(lq_sta->last_tx +
1116                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1117                 int t;
1118
1119                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1120                 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1121                         ieee80211_stop_tx_ba_session(sta, t);
1122
1123                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1124                 return;
1125         }
1126         lq_sta->last_tx = jiffies;
1127
1128         /* Here we actually compare this rate to the latest LQ command */
1129         if ((mac_index < 0) ||
1130             (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1131             (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1132             (rate.ant != info->status.antenna) ||
1133             (!!(ucode_rate & RATE_MCS_HT_MSK) !=
1134              !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
1135             (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
1136              !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
1137             (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
1138              !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
1139             (rate.index != mac_index)) {
1140                 IWL_DEBUG_RATE(mvm,
1141                                "initial rate %d does not match %d (0x%x)\n",
1142                                mac_index, rate.index, ucode_rate);
1143                 /*
1144                  * Since rates mis-match, the last LQ command may have failed.
1145                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1146                  * ... driver.
1147                  */
1148                 lq_sta->missed_rate_counter++;
1149                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1150                         lq_sta->missed_rate_counter = 0;
1151                         IWL_DEBUG_RATE(mvm,
1152                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1153                                        lq_sta->rs_state);
1154                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1155                 }
1156                 /* Regardless, ignore this status info for outdated rate */
1157                 return;
1158         } else
1159                 /* Rate did match, so reset the missed_rate_counter */
1160                 lq_sta->missed_rate_counter = 0;
1161
1162         if (!lq_sta->search_better_tbl) {
1163                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1164                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1165         } else {
1166                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1167                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1168         }
1169
1170         if (WARN_ON_ONCE(!rs_rate_match(&rate, &curr_tbl->rate))) {
1171                 IWL_DEBUG_RATE(mvm,
1172                                "Neither active nor search matches tx rate\n");
1173                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1174                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1175                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1176                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1177                 rs_dump_rate(mvm, &rate, "ACTUAL");
1178
1179                 /*
1180                  * no matching table found, let's by-pass the data collection
1181                  * and continue to perform rate scale to find the rate table
1182                  */
1183                 rs_stay_in_table(lq_sta, true);
1184                 goto done;
1185         }
1186
1187         /*
1188          * Updating the frame history depends on whether packets were
1189          * aggregated.
1190          *
1191          * For aggregation, all packets were transmitted at the same rate, the
1192          * first index into rate scale table.
1193          */
1194         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1195                 /* ampdu_ack_len = 0 marks no BA was received. In this case
1196                  * treat it as a single frame loss as we don't want the success
1197                  * ratio to dip too quickly because a BA wasn't received
1198                  */
1199                 if (info->status.ampdu_ack_len == 0)
1200                         info->status.ampdu_len = 1;
1201
1202                 ucode_rate = le32_to_cpu(table->rs_table[0]);
1203                 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1204                 rs_collect_tx_data(mvm, lq_sta, curr_tbl, rate.index,
1205                                    info->status.ampdu_len,
1206                                    info->status.ampdu_ack_len,
1207                                    reduced_txp);
1208
1209                 /* Update success/fail counts if not searching for new mode */
1210                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1211                         lq_sta->total_success += info->status.ampdu_ack_len;
1212                         lq_sta->total_failed += (info->status.ampdu_len -
1213                                         info->status.ampdu_ack_len);
1214                 }
1215         } else {
1216         /*
1217          * For legacy, update frame history with for each Tx retry.
1218          */
1219                 retries = info->status.rates[0].count - 1;
1220                 /* HW doesn't send more than 15 retries */
1221                 retries = min(retries, 15);
1222
1223                 /* The last transmission may have been successful */
1224                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1225                 /* Collect data for each rate used during failed TX attempts */
1226                 for (i = 0; i <= retries; ++i) {
1227                         ucode_rate = le32_to_cpu(table->rs_table[i]);
1228                         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1229                         /*
1230                          * Only collect stats if retried rate is in the same RS
1231                          * table as active/search.
1232                          */
1233                         if (rs_rate_match(&rate, &curr_tbl->rate))
1234                                 tmp_tbl = curr_tbl;
1235                         else if (rs_rate_match(&rate, &other_tbl->rate))
1236                                 tmp_tbl = other_tbl;
1237                         else
1238                                 continue;
1239
1240                         rs_collect_tx_data(mvm, lq_sta, tmp_tbl, rate.index, 1,
1241                                            i < retries ? 0 : legacy_success,
1242                                            reduced_txp);
1243                 }
1244
1245                 /* Update success/fail counts if not searching for new mode */
1246                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1247                         lq_sta->total_success += legacy_success;
1248                         lq_sta->total_failed += retries + (1 - legacy_success);
1249                 }
1250         }
1251         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1252         lq_sta->last_rate_n_flags = ucode_rate;
1253         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1254 done:
1255         /* See if there's a better rate or modulation mode to try. */
1256         if (sta->supp_rates[info->band])
1257                 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1258 }
1259
1260 /*
1261  * mac80211 sends us Tx status
1262  */
1263 static void rs_mac80211_tx_status(void *mvm_r,
1264                                   struct ieee80211_supported_band *sband,
1265                                   struct ieee80211_sta *sta, void *priv_sta,
1266                                   struct sk_buff *skb)
1267 {
1268         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1269         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1270         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1271         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1272
1273         if (!ieee80211_is_data(hdr->frame_control) ||
1274             info->flags & IEEE80211_TX_CTL_NO_ACK)
1275                 return;
1276
1277         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1278 }
1279
1280 /*
1281  * Begin a period of staying with a selected modulation mode.
1282  * Set "stay_in_tbl" flag to prevent any mode switches.
1283  * Set frame tx success limits according to legacy vs. high-throughput,
1284  * and reset overall (spanning all rates) tx success history statistics.
1285  * These control how long we stay using same modulation mode before
1286  * searching for a new mode.
1287  */
1288 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1289                                  struct iwl_lq_sta *lq_sta)
1290 {
1291         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1292         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1293         if (is_legacy) {
1294                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1295                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1296                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1297         } else {
1298                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1299                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1300                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1301         }
1302         lq_sta->table_count = 0;
1303         lq_sta->total_failed = 0;
1304         lq_sta->total_success = 0;
1305         lq_sta->flush_timer = jiffies;
1306         lq_sta->visited_columns = 0;
1307 }
1308
1309 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1310 {
1311         if (rate_mask)
1312                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1313         return IWL_RATE_INVALID;
1314 }
1315
1316 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1317                                    const struct rs_tx_column *column)
1318 {
1319         switch (column->mode) {
1320         case RS_LEGACY:
1321                 return lq_sta->max_legacy_rate_idx;
1322         case RS_SISO:
1323                 return lq_sta->max_siso_rate_idx;
1324         case RS_MIMO2:
1325                 return lq_sta->max_mimo2_rate_idx;
1326         default:
1327                 WARN_ON_ONCE(1);
1328         }
1329
1330         return lq_sta->max_legacy_rate_idx;
1331 }
1332
1333 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1334                                             const struct rs_tx_column *column,
1335                                             u32 bw)
1336 {
1337         /* Used to choose among HT tables */
1338         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1339
1340         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1341                          column->mode != RS_SISO &&
1342                          column->mode != RS_MIMO2))
1343                 return expected_tpt_legacy;
1344
1345         /* Legacy rates have only one table */
1346         if (column->mode == RS_LEGACY)
1347                 return expected_tpt_legacy;
1348
1349         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1350         /* Choose among many HT tables depending on number of streams
1351          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1352          * status */
1353         if (column->mode == RS_SISO) {
1354                 switch (bw) {
1355                 case RATE_MCS_CHAN_WIDTH_20:
1356                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1357                         break;
1358                 case RATE_MCS_CHAN_WIDTH_40:
1359                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1360                         break;
1361                 case RATE_MCS_CHAN_WIDTH_80:
1362                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1363                         break;
1364                 default:
1365                         WARN_ON_ONCE(1);
1366                 }
1367         } else if (column->mode == RS_MIMO2) {
1368                 switch (bw) {
1369                 case RATE_MCS_CHAN_WIDTH_20:
1370                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1371                         break;
1372                 case RATE_MCS_CHAN_WIDTH_40:
1373                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1374                         break;
1375                 case RATE_MCS_CHAN_WIDTH_80:
1376                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1377                         break;
1378                 default:
1379                         WARN_ON_ONCE(1);
1380                 }
1381         } else {
1382                 WARN_ON_ONCE(1);
1383         }
1384
1385         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1386                 return ht_tbl_pointer[0];
1387         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1388                 return ht_tbl_pointer[1];
1389         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1390                 return ht_tbl_pointer[2];
1391         else                                            /* AGG+SGI */
1392                 return ht_tbl_pointer[3];
1393 }
1394
1395 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1396                                       struct iwl_scale_tbl_info *tbl)
1397 {
1398         struct rs_rate *rate = &tbl->rate;
1399         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1400
1401         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1402 }
1403
1404 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1405                             struct iwl_lq_sta *lq_sta,
1406                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1407                             unsigned long rate_mask, s8 index)
1408 {
1409         struct iwl_scale_tbl_info *active_tbl =
1410             &(lq_sta->lq_info[lq_sta->active_tbl]);
1411         s32 success_ratio = active_tbl->win[index].success_ratio;
1412         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1413         const u16 *tpt_tbl = tbl->expected_tpt;
1414         u16 high_low;
1415         u32 target_tpt;
1416         int rate_idx;
1417
1418         if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) {
1419                 target_tpt = 100 * expected_current_tpt;
1420                 IWL_DEBUG_RATE(mvm,
1421                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1422                                success_ratio, target_tpt);
1423         } else {
1424                 target_tpt = lq_sta->last_tpt;
1425                 IWL_DEBUG_RATE(mvm,
1426                                "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1427                                success_ratio, target_tpt);
1428         }
1429
1430         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1431
1432         while (rate_idx != IWL_RATE_INVALID) {
1433                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1434                         break;
1435
1436                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1437                                                 tbl->rate.type);
1438
1439                 rate_idx = (high_low >> 8) & 0xff;
1440         }
1441
1442         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1443                        rate_idx, target_tpt,
1444                        rate_idx != IWL_RATE_INVALID ?
1445                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1446
1447         return rate_idx;
1448 }
1449
1450 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1451 {
1452         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1453                 return RATE_MCS_CHAN_WIDTH_80;
1454         else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1455                 return RATE_MCS_CHAN_WIDTH_40;
1456
1457         return RATE_MCS_CHAN_WIDTH_20;
1458 }
1459
1460 /*
1461  * Check whether we should continue using same modulation mode, or
1462  * begin search for a new mode, based on:
1463  * 1) # tx successes or failures while using this mode
1464  * 2) # times calling this function
1465  * 3) elapsed time in this mode (not used, for now)
1466  */
1467 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1468 {
1469         struct iwl_scale_tbl_info *tbl;
1470         int active_tbl;
1471         int flush_interval_passed = 0;
1472         struct iwl_mvm *mvm;
1473
1474         mvm = lq_sta->pers.drv;
1475         active_tbl = lq_sta->active_tbl;
1476
1477         tbl = &(lq_sta->lq_info[active_tbl]);
1478
1479         /* If we've been disallowing search, see if we should now allow it */
1480         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1481                 /* Elapsed time using current modulation mode */
1482                 if (lq_sta->flush_timer)
1483                         flush_interval_passed =
1484                                 time_after(jiffies,
1485                                            (unsigned long)(lq_sta->flush_timer +
1486                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1487
1488                 /*
1489                  * Check if we should allow search for new modulation mode.
1490                  * If many frames have failed or succeeded, or we've used
1491                  * this same modulation for a long time, allow search, and
1492                  * reset history stats that keep track of whether we should
1493                  * allow a new search.  Also (below) reset all bitmaps and
1494                  * stats in active history.
1495                  */
1496                 if (force_search ||
1497                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1498                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1499                     ((!lq_sta->search_better_tbl) &&
1500                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1501                         IWL_DEBUG_RATE(mvm,
1502                                        "LQ: stay is expired %d %d %d\n",
1503                                      lq_sta->total_failed,
1504                                      lq_sta->total_success,
1505                                      flush_interval_passed);
1506
1507                         /* Allow search for new mode */
1508                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1509                         IWL_DEBUG_RATE(mvm,
1510                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1511                         lq_sta->total_failed = 0;
1512                         lq_sta->total_success = 0;
1513                         lq_sta->flush_timer = 0;
1514                         /* mark the current column as visited */
1515                         lq_sta->visited_columns = BIT(tbl->column);
1516                 /*
1517                  * Else if we've used this modulation mode enough repetitions
1518                  * (regardless of elapsed time or success/failure), reset
1519                  * history bitmaps and rate-specific stats for all rates in
1520                  * active table.
1521                  */
1522                 } else {
1523                         lq_sta->table_count++;
1524                         if (lq_sta->table_count >=
1525                             lq_sta->table_count_limit) {
1526                                 lq_sta->table_count = 0;
1527
1528                                 IWL_DEBUG_RATE(mvm,
1529                                                "LQ: stay in table clear win\n");
1530                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1531                         }
1532                 }
1533
1534                 /* If transitioning to allow "search", reset all history
1535                  * bitmaps and stats in active table (this will become the new
1536                  * "search" table). */
1537                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1538                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1539                 }
1540         }
1541 }
1542
1543 /*
1544  * setup rate table in uCode
1545  */
1546 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1547                                struct ieee80211_sta *sta,
1548                                struct iwl_lq_sta *lq_sta,
1549                                struct rs_rate *rate)
1550 {
1551         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
1552         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1553 }
1554
1555 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1556                                          struct iwl_lq_sta *lq_sta,
1557                                          struct ieee80211_sta *sta,
1558                                          struct iwl_scale_tbl_info *tbl)
1559 {
1560         int i, j, max_rate;
1561         enum rs_column next_col_id;
1562         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1563         const struct rs_tx_column *next_col;
1564         allow_column_func_t allow_func;
1565         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1566         const u16 *expected_tpt_tbl;
1567         u16 tpt, max_expected_tpt;
1568
1569         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1570                 next_col_id = curr_col->next_columns[i];
1571
1572                 if (next_col_id == RS_COLUMN_INVALID)
1573                         continue;
1574
1575                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1576                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1577                                        next_col_id);
1578                         continue;
1579                 }
1580
1581                 next_col = &rs_tx_columns[next_col_id];
1582
1583                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1584                         IWL_DEBUG_RATE(mvm,
1585                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1586                                        next_col_id, valid_ants, next_col->ant);
1587                         continue;
1588                 }
1589
1590                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1591                         allow_func = next_col->checks[j];
1592                         if (allow_func && !allow_func(mvm, sta, tbl))
1593                                 break;
1594                 }
1595
1596                 if (j != MAX_COLUMN_CHECKS) {
1597                         IWL_DEBUG_RATE(mvm,
1598                                        "Skip column %d: not allowed (check %d failed)\n",
1599                                        next_col_id, j);
1600
1601                         continue;
1602                 }
1603
1604                 tpt = lq_sta->last_tpt / 100;
1605                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1606                                                      rs_bw_from_sta_bw(sta));
1607                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1608                         continue;
1609
1610                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1611                 if (max_rate == IWL_RATE_INVALID) {
1612                         IWL_DEBUG_RATE(mvm,
1613                                        "Skip column %d: no rate is allowed in this column\n",
1614                                        next_col_id);
1615                         continue;
1616                 }
1617
1618                 max_expected_tpt = expected_tpt_tbl[max_rate];
1619                 if (tpt >= max_expected_tpt) {
1620                         IWL_DEBUG_RATE(mvm,
1621                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1622                                        next_col_id, max_expected_tpt, tpt);
1623                         continue;
1624                 }
1625
1626                 IWL_DEBUG_RATE(mvm,
1627                                "Found potential column %d. Max expected %d current %d\n",
1628                                next_col_id, max_expected_tpt, tpt);
1629                 break;
1630         }
1631
1632         if (i == MAX_NEXT_COLUMNS)
1633                 return RS_COLUMN_INVALID;
1634
1635         return next_col_id;
1636 }
1637
1638 static int rs_switch_to_column(struct iwl_mvm *mvm,
1639                                struct iwl_lq_sta *lq_sta,
1640                                struct ieee80211_sta *sta,
1641                                enum rs_column col_id)
1642 {
1643         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1644         struct iwl_scale_tbl_info *search_tbl =
1645                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1646         struct rs_rate *rate = &search_tbl->rate;
1647         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1648         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1649         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1650                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1651         unsigned long rate_mask = 0;
1652         u32 rate_idx = 0;
1653
1654         memcpy(search_tbl, tbl, sz);
1655
1656         rate->sgi = column->sgi;
1657         rate->ant = column->ant;
1658
1659         if (column->mode == RS_LEGACY) {
1660                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1661                         rate->type = LQ_LEGACY_A;
1662                 else
1663                         rate->type = LQ_LEGACY_G;
1664
1665                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1666                 rate->ldpc = false;
1667                 rate_mask = lq_sta->active_legacy_rate;
1668         } else if (column->mode == RS_SISO) {
1669                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1670                 rate_mask = lq_sta->active_siso_rate;
1671         } else if (column->mode == RS_MIMO2) {
1672                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1673                 rate_mask = lq_sta->active_mimo2_rate;
1674         } else {
1675                 WARN_ON_ONCE("Bad column mode");
1676         }
1677
1678         if (column->mode != RS_LEGACY) {
1679                 rate->bw = rs_bw_from_sta_bw(sta);
1680                 rate->ldpc = lq_sta->ldpc;
1681         }
1682
1683         search_tbl->column = col_id;
1684         rs_set_expected_tpt_table(lq_sta, search_tbl);
1685
1686         lq_sta->visited_columns |= BIT(col_id);
1687
1688         /* Get the best matching rate if we're changing modes. e.g.
1689          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1690          */
1691         if (curr_column->mode != column->mode) {
1692                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1693                                             rate_mask, rate->index);
1694
1695                 if ((rate_idx == IWL_RATE_INVALID) ||
1696                     !(BIT(rate_idx) & rate_mask)) {
1697                         IWL_DEBUG_RATE(mvm,
1698                                        "can not switch with index %d"
1699                                        " rate mask %lx\n",
1700                                        rate_idx, rate_mask);
1701
1702                         goto err;
1703                 }
1704
1705                 rate->index = rate_idx;
1706         }
1707
1708         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1709                        col_id, rate->index);
1710
1711         return 0;
1712
1713 err:
1714         rate->type = LQ_NONE;
1715         return -1;
1716 }
1717
1718 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1719                                          struct iwl_scale_tbl_info *tbl,
1720                                          s32 sr, int low, int high,
1721                                          int current_tpt,
1722                                          int low_tpt, int high_tpt)
1723 {
1724         enum rs_action action = RS_ACTION_STAY;
1725
1726         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1727             (current_tpt == 0)) {
1728                 IWL_DEBUG_RATE(mvm,
1729                                "Decrease rate because of low SR\n");
1730                 return RS_ACTION_DOWNSCALE;
1731         }
1732
1733         if ((low_tpt == IWL_INVALID_VALUE) &&
1734             (high_tpt == IWL_INVALID_VALUE) &&
1735             (high != IWL_RATE_INVALID)) {
1736                 IWL_DEBUG_RATE(mvm,
1737                                "No data about high/low rates. Increase rate\n");
1738                 return RS_ACTION_UPSCALE;
1739         }
1740
1741         if ((high_tpt == IWL_INVALID_VALUE) &&
1742             (high != IWL_RATE_INVALID) &&
1743             (low_tpt != IWL_INVALID_VALUE) &&
1744             (low_tpt < current_tpt)) {
1745                 IWL_DEBUG_RATE(mvm,
1746                                "No data about high rate and low rate is worse. Increase rate\n");
1747                 return RS_ACTION_UPSCALE;
1748         }
1749
1750         if ((high_tpt != IWL_INVALID_VALUE) &&
1751             (high_tpt > current_tpt)) {
1752                 IWL_DEBUG_RATE(mvm,
1753                                "Higher rate is better. Increate rate\n");
1754                 return RS_ACTION_UPSCALE;
1755         }
1756
1757         if ((low_tpt != IWL_INVALID_VALUE) &&
1758             (high_tpt != IWL_INVALID_VALUE) &&
1759             (low_tpt < current_tpt) &&
1760             (high_tpt < current_tpt)) {
1761                 IWL_DEBUG_RATE(mvm,
1762                                "Both high and low are worse. Maintain rate\n");
1763                 return RS_ACTION_STAY;
1764         }
1765
1766         if ((low_tpt != IWL_INVALID_VALUE) &&
1767             (low_tpt > current_tpt)) {
1768                 IWL_DEBUG_RATE(mvm,
1769                                "Lower rate is better\n");
1770                 action = RS_ACTION_DOWNSCALE;
1771                 goto out;
1772         }
1773
1774         if ((low_tpt == IWL_INVALID_VALUE) &&
1775             (low != IWL_RATE_INVALID)) {
1776                 IWL_DEBUG_RATE(mvm,
1777                                "No data about lower rate\n");
1778                 action = RS_ACTION_DOWNSCALE;
1779                 goto out;
1780         }
1781
1782         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1783
1784 out:
1785         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1786                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1787                         IWL_DEBUG_RATE(mvm,
1788                                        "SR is above NO DECREASE. Avoid downscale\n");
1789                         action = RS_ACTION_STAY;
1790                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1791                         IWL_DEBUG_RATE(mvm,
1792                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1793                         action = RS_ACTION_STAY;
1794                 } else {
1795                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1796                 }
1797         }
1798
1799         return action;
1800 }
1801
1802 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1803                           struct iwl_lq_sta *lq_sta)
1804 {
1805         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1806          * supports STBC of at least 1*SS
1807          */
1808         if (!lq_sta->stbc)
1809                 return false;
1810
1811         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1812                 return false;
1813
1814         return true;
1815 }
1816
1817 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1818                                 int *weaker, int *stronger)
1819 {
1820         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1821         if (*weaker > TPC_MAX_REDUCTION)
1822                 *weaker = TPC_INVALID;
1823
1824         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1825         if (*stronger < 0)
1826                 *stronger = TPC_INVALID;
1827 }
1828
1829 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1830                            struct rs_rate *rate, enum ieee80211_band band)
1831 {
1832         int index = rate->index;
1833         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1834         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1835                                 !vif->bss_conf.ps);
1836
1837         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1838                        cam, sta_ps_disabled);
1839         /*
1840          * allow tpc only if power management is enabled, or bt coex
1841          * activity grade allows it and we are on 2.4Ghz.
1842          */
1843         if ((cam || sta_ps_disabled) &&
1844             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1845                 return false;
1846
1847         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1848         if (is_legacy(rate))
1849                 return index == IWL_RATE_54M_INDEX;
1850         if (is_ht(rate))
1851                 return index == IWL_RATE_MCS_7_INDEX;
1852         if (is_vht(rate))
1853                 return index == IWL_RATE_MCS_7_INDEX ||
1854                        index == IWL_RATE_MCS_8_INDEX ||
1855                        index == IWL_RATE_MCS_9_INDEX;
1856
1857         WARN_ON_ONCE(1);
1858         return false;
1859 }
1860
1861 enum tpc_action {
1862         TPC_ACTION_STAY,
1863         TPC_ACTION_DECREASE,
1864         TPC_ACTION_INCREASE,
1865         TPC_ACTION_NO_RESTIRCTION,
1866 };
1867
1868 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1869                                          s32 sr, int weak, int strong,
1870                                          int current_tpt,
1871                                          int weak_tpt, int strong_tpt)
1872 {
1873         /* stay until we have valid tpt */
1874         if (current_tpt == IWL_INVALID_VALUE) {
1875                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1876                 return TPC_ACTION_STAY;
1877         }
1878
1879         /* Too many failures, increase txp */
1880         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1881             current_tpt == 0) {
1882                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1883                 return TPC_ACTION_NO_RESTIRCTION;
1884         }
1885
1886         /* try decreasing first if applicable */
1887         if (weak != TPC_INVALID) {
1888                 if (weak_tpt == IWL_INVALID_VALUE &&
1889                     (strong_tpt == IWL_INVALID_VALUE ||
1890                      current_tpt >= strong_tpt)) {
1891                         IWL_DEBUG_RATE(mvm,
1892                                        "no weak txp measurement. decrease txp\n");
1893                         return TPC_ACTION_DECREASE;
1894                 }
1895
1896                 if (weak_tpt > current_tpt) {
1897                         IWL_DEBUG_RATE(mvm,
1898                                        "lower txp has better tpt. decrease txp\n");
1899                         return TPC_ACTION_DECREASE;
1900                 }
1901         }
1902
1903         /* next, increase if needed */
1904         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1905             strong != TPC_INVALID) {
1906                 if (weak_tpt == IWL_INVALID_VALUE &&
1907                     strong_tpt != IWL_INVALID_VALUE &&
1908                     current_tpt < strong_tpt) {
1909                         IWL_DEBUG_RATE(mvm,
1910                                        "higher txp has better tpt. increase txp\n");
1911                         return TPC_ACTION_INCREASE;
1912                 }
1913
1914                 if (weak_tpt < current_tpt &&
1915                     (strong_tpt == IWL_INVALID_VALUE ||
1916                      strong_tpt > current_tpt)) {
1917                         IWL_DEBUG_RATE(mvm,
1918                                        "lower txp has worse tpt. increase txp\n");
1919                         return TPC_ACTION_INCREASE;
1920                 }
1921         }
1922
1923         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1924         return TPC_ACTION_STAY;
1925 }
1926
1927 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1928                            struct ieee80211_sta *sta,
1929                            struct iwl_lq_sta *lq_sta,
1930                            struct iwl_scale_tbl_info *tbl)
1931 {
1932         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1933         struct ieee80211_vif *vif = mvm_sta->vif;
1934         struct ieee80211_chanctx_conf *chanctx_conf;
1935         enum ieee80211_band band;
1936         struct iwl_rate_scale_data *window;
1937         struct rs_rate *rate = &tbl->rate;
1938         enum tpc_action action;
1939         s32 sr;
1940         u8 cur = lq_sta->lq.reduced_tpc;
1941         int current_tpt;
1942         int weak, strong;
1943         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1944
1945 #ifdef CONFIG_MAC80211_DEBUGFS
1946         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1947                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1948                                lq_sta->pers.dbg_fixed_txp_reduction);
1949                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1950                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1951         }
1952 #endif
1953
1954         rcu_read_lock();
1955         chanctx_conf = rcu_dereference(vif->chanctx_conf);
1956         if (WARN_ON(!chanctx_conf))
1957                 band = IEEE80211_NUM_BANDS;
1958         else
1959                 band = chanctx_conf->def.chan->band;
1960         rcu_read_unlock();
1961
1962         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1963                 IWL_DEBUG_RATE(mvm,
1964                                "tpc is not allowed. remove txp restrictions\n");
1965                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1966                 return cur != TPC_NO_REDUCTION;
1967         }
1968
1969         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1970
1971         /* Collect measured throughputs for current and adjacent rates */
1972         window = tbl->tpc_win;
1973         sr = window[cur].success_ratio;
1974         current_tpt = window[cur].average_tpt;
1975         if (weak != TPC_INVALID)
1976                 weak_tpt = window[weak].average_tpt;
1977         if (strong != TPC_INVALID)
1978                 strong_tpt = window[strong].average_tpt;
1979
1980         IWL_DEBUG_RATE(mvm,
1981                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1982                        cur, current_tpt, sr, weak, strong,
1983                        weak_tpt, strong_tpt);
1984
1985         action = rs_get_tpc_action(mvm, sr, weak, strong,
1986                                    current_tpt, weak_tpt, strong_tpt);
1987
1988         /* override actions if we are on the edge */
1989         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
1990                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
1991                 action = TPC_ACTION_STAY;
1992         } else if (strong == TPC_INVALID &&
1993                    (action == TPC_ACTION_INCREASE ||
1994                     action == TPC_ACTION_NO_RESTIRCTION)) {
1995                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
1996                 action = TPC_ACTION_STAY;
1997         }
1998
1999         switch (action) {
2000         case TPC_ACTION_DECREASE:
2001                 lq_sta->lq.reduced_tpc = weak;
2002                 return true;
2003         case TPC_ACTION_INCREASE:
2004                 lq_sta->lq.reduced_tpc = strong;
2005                 return true;
2006         case TPC_ACTION_NO_RESTIRCTION:
2007                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2008                 return true;
2009         case TPC_ACTION_STAY:
2010                 /* do nothing */
2011                 break;
2012         }
2013         return false;
2014 }
2015
2016 /*
2017  * Do rate scaling and search for new modulation mode.
2018  */
2019 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2020                                   struct ieee80211_sta *sta,
2021                                   struct iwl_lq_sta *lq_sta,
2022                                   int tid)
2023 {
2024         int low = IWL_RATE_INVALID;
2025         int high = IWL_RATE_INVALID;
2026         int index;
2027         struct iwl_rate_scale_data *window = NULL;
2028         int current_tpt = IWL_INVALID_VALUE;
2029         int low_tpt = IWL_INVALID_VALUE;
2030         int high_tpt = IWL_INVALID_VALUE;
2031         u32 fail_count;
2032         enum rs_action scale_action = RS_ACTION_STAY;
2033         u16 rate_mask;
2034         u8 update_lq = 0;
2035         struct iwl_scale_tbl_info *tbl, *tbl1;
2036         u8 active_tbl = 0;
2037         u8 done_search = 0;
2038         u16 high_low;
2039         s32 sr;
2040         u8 prev_agg = lq_sta->is_agg;
2041         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2042         struct iwl_mvm_tid_data *tid_data;
2043         struct rs_rate *rate;
2044
2045         lq_sta->is_agg = !!sta_priv->agg_tids;
2046
2047         /*
2048          * Select rate-scale / modulation-mode table to work with in
2049          * the rest of this function:  "search" if searching for better
2050          * modulation mode, or "active" if doing rate scaling within a mode.
2051          */
2052         if (!lq_sta->search_better_tbl)
2053                 active_tbl = lq_sta->active_tbl;
2054         else
2055                 active_tbl = 1 - lq_sta->active_tbl;
2056
2057         tbl = &(lq_sta->lq_info[active_tbl]);
2058         rate = &tbl->rate;
2059
2060         if (prev_agg != lq_sta->is_agg) {
2061                 IWL_DEBUG_RATE(mvm,
2062                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2063                                prev_agg, lq_sta->is_agg);
2064                 rs_set_expected_tpt_table(lq_sta, tbl);
2065                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2066         }
2067
2068         /* current tx rate */
2069         index = lq_sta->last_txrate_idx;
2070
2071         /* rates available for this association, and for modulation mode */
2072         rate_mask = rs_get_supported_rates(lq_sta, rate);
2073
2074         if (!(BIT(index) & rate_mask)) {
2075                 IWL_ERR(mvm, "Current Rate is not valid\n");
2076                 if (lq_sta->search_better_tbl) {
2077                         /* revert to active table if search table is not valid*/
2078                         rate->type = LQ_NONE;
2079                         lq_sta->search_better_tbl = 0;
2080                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2081                         rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2082                 }
2083                 return;
2084         }
2085
2086         /* Get expected throughput table and history window for current rate */
2087         if (!tbl->expected_tpt) {
2088                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2089                 return;
2090         }
2091
2092         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2093         window = &(tbl->win[index]);
2094
2095         /*
2096          * If there is not enough history to calculate actual average
2097          * throughput, keep analyzing results of more tx frames, without
2098          * changing rate or mode (bypass most of the rest of this function).
2099          * Set up new rate table in uCode only if old rate is not supported
2100          * in current association (use new rate found above).
2101          */
2102         fail_count = window->counter - window->success_counter;
2103         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2104             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2105                 IWL_DEBUG_RATE(mvm,
2106                                "(%s: %d): Test Window: succ %d total %d\n",
2107                                rs_pretty_lq_type(rate->type),
2108                                index, window->success_counter, window->counter);
2109
2110                 /* Can't calculate this yet; not enough history */
2111                 window->average_tpt = IWL_INVALID_VALUE;
2112
2113                 /* Should we stay with this modulation mode,
2114                  * or search for a new one? */
2115                 rs_stay_in_table(lq_sta, false);
2116
2117                 goto out;
2118         }
2119         /* Else we have enough samples; calculate estimate of
2120          * actual average throughput */
2121         if (window->average_tpt != ((window->success_ratio *
2122                         tbl->expected_tpt[index] + 64) / 128)) {
2123                 window->average_tpt = ((window->success_ratio *
2124                                         tbl->expected_tpt[index] + 64) / 128);
2125         }
2126
2127         /* If we are searching for better modulation mode, check success. */
2128         if (lq_sta->search_better_tbl) {
2129                 /* If good success, continue using the "search" mode;
2130                  * no need to send new link quality command, since we're
2131                  * continuing to use the setup that we've been trying. */
2132                 if (window->average_tpt > lq_sta->last_tpt) {
2133                         IWL_DEBUG_RATE(mvm,
2134                                        "SWITCHING TO NEW TABLE SR: %d "
2135                                        "cur-tpt %d old-tpt %d\n",
2136                                        window->success_ratio,
2137                                        window->average_tpt,
2138                                        lq_sta->last_tpt);
2139
2140                         /* Swap tables; "search" becomes "active" */
2141                         lq_sta->active_tbl = active_tbl;
2142                         current_tpt = window->average_tpt;
2143                 /* Else poor success; go back to mode in "active" table */
2144                 } else {
2145                         IWL_DEBUG_RATE(mvm,
2146                                        "GOING BACK TO THE OLD TABLE: SR %d "
2147                                        "cur-tpt %d old-tpt %d\n",
2148                                        window->success_ratio,
2149                                        window->average_tpt,
2150                                        lq_sta->last_tpt);
2151
2152                         /* Nullify "search" table */
2153                         rate->type = LQ_NONE;
2154
2155                         /* Revert to "active" table */
2156                         active_tbl = lq_sta->active_tbl;
2157                         tbl = &(lq_sta->lq_info[active_tbl]);
2158
2159                         /* Revert to "active" rate and throughput info */
2160                         index = tbl->rate.index;
2161                         current_tpt = lq_sta->last_tpt;
2162
2163                         /* Need to set up a new rate table in uCode */
2164                         update_lq = 1;
2165                 }
2166
2167                 /* Either way, we've made a decision; modulation mode
2168                  * search is done, allow rate adjustment next time. */
2169                 lq_sta->search_better_tbl = 0;
2170                 done_search = 1;        /* Don't switch modes below! */
2171                 goto lq_update;
2172         }
2173
2174         /* (Else) not in search of better modulation mode, try for better
2175          * starting rate, while staying in this mode. */
2176         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2177         low = high_low & 0xff;
2178         high = (high_low >> 8) & 0xff;
2179
2180         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2181
2182         sr = window->success_ratio;
2183
2184         /* Collect measured throughputs for current and adjacent rates */
2185         current_tpt = window->average_tpt;
2186         if (low != IWL_RATE_INVALID)
2187                 low_tpt = tbl->win[low].average_tpt;
2188         if (high != IWL_RATE_INVALID)
2189                 high_tpt = tbl->win[high].average_tpt;
2190
2191         IWL_DEBUG_RATE(mvm,
2192                        "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2193                        rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2194                        low, high, low_tpt, high_tpt);
2195
2196         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2197                                           current_tpt, low_tpt, high_tpt);
2198
2199         /* Force a search in case BT doesn't like us being in MIMO */
2200         if (is_mimo(rate) &&
2201             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2202                 IWL_DEBUG_RATE(mvm,
2203                                "BT Coex forbids MIMO. Search for new config\n");
2204                 rs_stay_in_table(lq_sta, true);
2205                 goto lq_update;
2206         }
2207
2208         switch (scale_action) {
2209         case RS_ACTION_DOWNSCALE:
2210                 /* Decrease starting rate, update uCode's rate table */
2211                 if (low != IWL_RATE_INVALID) {
2212                         update_lq = 1;
2213                         index = low;
2214                 } else {
2215                         IWL_DEBUG_RATE(mvm,
2216                                        "At the bottom rate. Can't decrease\n");
2217                 }
2218
2219                 break;
2220         case RS_ACTION_UPSCALE:
2221                 /* Increase starting rate, update uCode's rate table */
2222                 if (high != IWL_RATE_INVALID) {
2223                         update_lq = 1;
2224                         index = high;
2225                 } else {
2226                         IWL_DEBUG_RATE(mvm,
2227                                        "At the top rate. Can't increase\n");
2228                 }
2229
2230                 break;
2231         case RS_ACTION_STAY:
2232                 /* No change */
2233                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2234                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2235                 break;
2236         default:
2237                 break;
2238         }
2239
2240 lq_update:
2241         /* Replace uCode's rate table for the destination station. */
2242         if (update_lq) {
2243                 tbl->rate.index = index;
2244                 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2245         }
2246
2247         rs_stay_in_table(lq_sta, false);
2248
2249         /*
2250          * Search for new modulation mode if we're:
2251          * 1)  Not changing rates right now
2252          * 2)  Not just finishing up a search
2253          * 3)  Allowing a new search
2254          */
2255         if (!update_lq && !done_search &&
2256             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2257             && window->counter) {
2258                 enum rs_column next_column;
2259
2260                 /* Save current throughput to compare with "search" throughput*/
2261                 lq_sta->last_tpt = current_tpt;
2262
2263                 IWL_DEBUG_RATE(mvm,
2264                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2265                                update_lq, done_search, lq_sta->rs_state,
2266                                window->counter);
2267
2268                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2269                 if (next_column != RS_COLUMN_INVALID) {
2270                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2271                                                       next_column);
2272                         if (!ret)
2273                                 lq_sta->search_better_tbl = 1;
2274                 } else {
2275                         IWL_DEBUG_RATE(mvm,
2276                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2277                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2278                 }
2279
2280                 /* If new "search" mode was selected, set up in uCode table */
2281                 if (lq_sta->search_better_tbl) {
2282                         /* Access the "search" table, clear its history. */
2283                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2284                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2285
2286                         /* Use new "search" start rate */
2287                         index = tbl->rate.index;
2288
2289                         rs_dump_rate(mvm, &tbl->rate,
2290                                      "Switch to SEARCH TABLE:");
2291                         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
2292                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2293                 } else {
2294                         done_search = 1;
2295                 }
2296         }
2297
2298         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2299                 /* If the "active" (non-search) mode was legacy,
2300                  * and we've tried switching antennas,
2301                  * but we haven't been able to try HT modes (not available),
2302                  * stay with best antenna legacy modulation for a while
2303                  * before next round of mode comparisons. */
2304                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2305                 if (is_legacy(&tbl1->rate)) {
2306                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2307
2308                         if (tid != IWL_MAX_TID_COUNT) {
2309                                 tid_data = &sta_priv->tid_data[tid];
2310                                 if (tid_data->state != IWL_AGG_OFF) {
2311                                         IWL_DEBUG_RATE(mvm,
2312                                                        "Stop aggregation on tid %d\n",
2313                                                        tid);
2314                                         ieee80211_stop_tx_ba_session(sta, tid);
2315                                 }
2316                         }
2317                         rs_set_stay_in_table(mvm, 1, lq_sta);
2318                 } else {
2319                 /* If we're in an HT mode, and all 3 mode switch actions
2320                  * have been tried and compared, stay in this best modulation
2321                  * mode for a while before next round of mode comparisons. */
2322                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2323                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2324                             (tid != IWL_MAX_TID_COUNT)) {
2325                                 tid_data = &sta_priv->tid_data[tid];
2326                                 if (tid_data->state == IWL_AGG_OFF) {
2327                                         IWL_DEBUG_RATE(mvm,
2328                                                        "try to aggregate tid %d\n",
2329                                                        tid);
2330                                         rs_tl_turn_on_agg(mvm, tid,
2331                                                           lq_sta, sta);
2332                                 }
2333                         }
2334                         rs_set_stay_in_table(mvm, 0, lq_sta);
2335                 }
2336         }
2337
2338 out:
2339         lq_sta->last_txrate_idx = index;
2340 }
2341
2342 struct rs_init_rate_info {
2343         s8 rssi;
2344         u8 rate_idx;
2345 };
2346
2347 static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
2348         { -60, IWL_RATE_54M_INDEX },
2349         { -64, IWL_RATE_48M_INDEX },
2350         { -68, IWL_RATE_36M_INDEX },
2351         { -80, IWL_RATE_24M_INDEX },
2352         { -84, IWL_RATE_18M_INDEX },
2353         { -85, IWL_RATE_12M_INDEX },
2354         { -86, IWL_RATE_11M_INDEX },
2355         { -88, IWL_RATE_5M_INDEX  },
2356         { -90, IWL_RATE_2M_INDEX  },
2357         { S8_MIN, IWL_RATE_1M_INDEX },
2358 };
2359
2360 static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
2361         { -60, IWL_RATE_54M_INDEX },
2362         { -64, IWL_RATE_48M_INDEX },
2363         { -72, IWL_RATE_36M_INDEX },
2364         { -80, IWL_RATE_24M_INDEX },
2365         { -84, IWL_RATE_18M_INDEX },
2366         { -85, IWL_RATE_12M_INDEX },
2367         { -87, IWL_RATE_9M_INDEX  },
2368         { S8_MIN, IWL_RATE_6M_INDEX },
2369 };
2370
2371 /* Choose an initial legacy rate and antenna to use based on the RSSI
2372  * of last Rx
2373  */
2374 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2375                                 struct iwl_lq_sta *lq_sta,
2376                                 enum ieee80211_band band,
2377                                 struct rs_rate *rate)
2378 {
2379         int i, nentries;
2380         s8 best_rssi = S8_MIN;
2381         u8 best_ant = ANT_NONE;
2382         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2383         const struct rs_init_rate_info *initial_rates;
2384
2385         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2386                 if (!(lq_sta->pers.chains & BIT(i)))
2387                         continue;
2388
2389                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2390                         best_rssi = lq_sta->pers.chain_signal[i];
2391                         best_ant = BIT(i);
2392                 }
2393         }
2394
2395         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2396                        rs_pretty_ant(best_ant), best_rssi);
2397
2398         if (best_ant != ANT_A && best_ant != ANT_B)
2399                 rate->ant = first_antenna(valid_tx_ant);
2400         else
2401                 rate->ant = best_ant;
2402
2403         rate->sgi = false;
2404         rate->ldpc = false;
2405         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2406
2407         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2408                                      BITS_PER_LONG);
2409
2410         if (band == IEEE80211_BAND_5GHZ) {
2411                 rate->type = LQ_LEGACY_A;
2412                 initial_rates = rs_init_rates_5ghz;
2413                 nentries = ARRAY_SIZE(rs_init_rates_5ghz);
2414         } else {
2415                 rate->type = LQ_LEGACY_G;
2416                 initial_rates = rs_init_rates_24ghz;
2417                 nentries = ARRAY_SIZE(rs_init_rates_24ghz);
2418         }
2419
2420         if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2421                 for (i = 0; i < nentries; i++) {
2422                         int rate_idx = initial_rates[i].rate_idx;
2423                         if ((best_rssi >= initial_rates[i].rssi) &&
2424                             (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2425                                 rate->index = rate_idx;
2426                                 break;
2427                         }
2428                 }
2429         }
2430
2431         IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2432                        rs_pretty_ant(rate->ant));
2433 }
2434
2435 /* Save info about RSSI of last Rx */
2436 void rs_update_last_rssi(struct iwl_mvm *mvm,
2437                          struct iwl_lq_sta *lq_sta,
2438                          struct ieee80211_rx_status *rx_status)
2439 {
2440         lq_sta->pers.chains = rx_status->chains;
2441         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2442         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2443         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2444 }
2445
2446 /**
2447  * rs_initialize_lq - Initialize a station's hardware rate table
2448  *
2449  * The uCode's station table contains a table of fallback rates
2450  * for automatic fallback during transmission.
2451  *
2452  * NOTE: This sets up a default set of values.  These will be replaced later
2453  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2454  *       rc80211_simple.
2455  *
2456  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2457  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2458  *       which requires station table entry to exist).
2459  */
2460 static void rs_initialize_lq(struct iwl_mvm *mvm,
2461                              struct ieee80211_sta *sta,
2462                              struct iwl_lq_sta *lq_sta,
2463                              enum ieee80211_band band,
2464                              bool init)
2465 {
2466         struct iwl_scale_tbl_info *tbl;
2467         struct rs_rate *rate;
2468         u8 active_tbl = 0;
2469
2470         if (!sta || !lq_sta)
2471                 return;
2472
2473         if (!lq_sta->search_better_tbl)
2474                 active_tbl = lq_sta->active_tbl;
2475         else
2476                 active_tbl = 1 - lq_sta->active_tbl;
2477
2478         tbl = &(lq_sta->lq_info[active_tbl]);
2479         rate = &tbl->rate;
2480
2481         rs_get_initial_rate(mvm, lq_sta, band, rate);
2482         lq_sta->last_txrate_idx = rate->index;
2483
2484         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2485         if (rate->ant == ANT_A)
2486                 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2487         else
2488                 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2489
2490         rs_set_expected_tpt_table(lq_sta, tbl);
2491         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2492         /* TODO restore station should remember the lq cmd */
2493         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2494 }
2495
2496 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2497                         struct ieee80211_tx_rate_control *txrc)
2498 {
2499         struct sk_buff *skb = txrc->skb;
2500         struct iwl_op_mode *op_mode __maybe_unused =
2501                         (struct iwl_op_mode *)mvm_r;
2502         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2503         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2504         struct iwl_lq_sta *lq_sta = mvm_sta;
2505
2506         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2507
2508         /* Treat uninitialized rate scaling data same as non-existing. */
2509         if (lq_sta && !lq_sta->pers.drv) {
2510                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2511                 mvm_sta = NULL;
2512         }
2513
2514         /* Send management frames and NO_ACK data using lowest rate. */
2515         if (rate_control_send_low(sta, mvm_sta, txrc))
2516                 return;
2517
2518         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2519                                   info->band, &info->control.rates[0]);
2520
2521         info->control.rates[0].count = 1;
2522 }
2523
2524 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2525                           gfp_t gfp)
2526 {
2527         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2528         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2529         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2530         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2531
2532         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2533
2534         lq_sta->pers.drv = mvm;
2535 #ifdef CONFIG_MAC80211_DEBUGFS
2536         lq_sta->pers.dbg_fixed_rate = 0;
2537         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2538 #endif
2539         lq_sta->pers.chains = 0;
2540         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2541
2542         return &sta_priv->lq_sta;
2543 }
2544
2545 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2546                                        int nss)
2547 {
2548         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2549                 (0x3 << (2 * (nss - 1)));
2550         rx_mcs >>= (2 * (nss - 1));
2551
2552         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2553                 return IWL_RATE_MCS_7_INDEX;
2554         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2555                 return IWL_RATE_MCS_8_INDEX;
2556         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2557                 return IWL_RATE_MCS_9_INDEX;
2558
2559         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2560         return -1;
2561 }
2562
2563 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2564                                      struct ieee80211_sta_vht_cap *vht_cap,
2565                                      struct iwl_lq_sta *lq_sta)
2566 {
2567         int i;
2568         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2569
2570         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2571                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2572                         if (i == IWL_RATE_9M_INDEX)
2573                                 continue;
2574
2575                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2576                         if (i == IWL_RATE_MCS_9_INDEX &&
2577                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2578                                 continue;
2579
2580                         lq_sta->active_siso_rate |= BIT(i);
2581                 }
2582         }
2583
2584         if (sta->rx_nss < 2)
2585                 return;
2586
2587         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2588         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2589                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2590                         if (i == IWL_RATE_9M_INDEX)
2591                                 continue;
2592
2593                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2594                         if (i == IWL_RATE_MCS_9_INDEX &&
2595                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2596                                 continue;
2597
2598                         lq_sta->active_mimo2_rate |= BIT(i);
2599                 }
2600         }
2601 }
2602
2603 static void rs_ht_init(struct iwl_mvm *mvm,
2604                        struct ieee80211_sta *sta,
2605                        struct iwl_lq_sta *lq_sta,
2606                        struct ieee80211_sta_ht_cap *ht_cap)
2607 {
2608         /* active_siso_rate mask includes 9 MBits (bit 5),
2609          * and CCK (bits 0-3), supp_rates[] does not;
2610          * shift to convert format, force 9 MBits off.
2611          */
2612         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2613         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2614         lq_sta->active_siso_rate &= ~((u16)0x2);
2615         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2616
2617         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2618         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2619         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2620         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2621
2622         if (mvm->cfg->ht_params->ldpc &&
2623             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2624                 lq_sta->ldpc = true;
2625
2626         if (mvm->cfg->ht_params->stbc &&
2627             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2628             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2629                 lq_sta->stbc = true;
2630
2631         lq_sta->is_vht = false;
2632 }
2633
2634 static void rs_vht_init(struct iwl_mvm *mvm,
2635                         struct ieee80211_sta *sta,
2636                         struct iwl_lq_sta *lq_sta,
2637                         struct ieee80211_sta_vht_cap *vht_cap)
2638 {
2639         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2640
2641         if (mvm->cfg->ht_params->ldpc &&
2642             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2643                 lq_sta->ldpc = true;
2644
2645         if (mvm->cfg->ht_params->stbc &&
2646             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2647             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2648                 lq_sta->stbc = true;
2649
2650         lq_sta->is_vht = true;
2651 }
2652
2653 #ifdef CONFIG_IWLWIFI_DEBUGFS
2654 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2655 {
2656         spin_lock_bh(&mvm->drv_stats_lock);
2657         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2658         spin_unlock_bh(&mvm->drv_stats_lock);
2659 }
2660
2661 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2662 {
2663         u8 nss = 0, mcs = 0;
2664
2665         spin_lock(&mvm->drv_stats_lock);
2666
2667         if (agg)
2668                 mvm->drv_rx_stats.agg_frames++;
2669
2670         mvm->drv_rx_stats.success_frames++;
2671
2672         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2673         case RATE_MCS_CHAN_WIDTH_20:
2674                 mvm->drv_rx_stats.bw_20_frames++;
2675                 break;
2676         case RATE_MCS_CHAN_WIDTH_40:
2677                 mvm->drv_rx_stats.bw_40_frames++;
2678                 break;
2679         case RATE_MCS_CHAN_WIDTH_80:
2680                 mvm->drv_rx_stats.bw_80_frames++;
2681                 break;
2682         default:
2683                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2684         }
2685
2686         if (rate & RATE_MCS_HT_MSK) {
2687                 mvm->drv_rx_stats.ht_frames++;
2688                 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2689                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2690         } else if (rate & RATE_MCS_VHT_MSK) {
2691                 mvm->drv_rx_stats.vht_frames++;
2692                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2693                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2694                        RATE_VHT_MCS_NSS_POS) + 1;
2695         } else {
2696                 mvm->drv_rx_stats.legacy_frames++;
2697         }
2698
2699         if (nss == 1)
2700                 mvm->drv_rx_stats.siso_frames++;
2701         else if (nss == 2)
2702                 mvm->drv_rx_stats.mimo2_frames++;
2703
2704         if (rate & RATE_MCS_SGI_MSK)
2705                 mvm->drv_rx_stats.sgi_frames++;
2706         else
2707                 mvm->drv_rx_stats.ngi_frames++;
2708
2709         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2710         mvm->drv_rx_stats.last_frame_idx =
2711                 (mvm->drv_rx_stats.last_frame_idx + 1) %
2712                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2713
2714         spin_unlock(&mvm->drv_stats_lock);
2715 }
2716 #endif
2717
2718 /*
2719  * Called after adding a new station to initialize rate scaling
2720  */
2721 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2722                           enum ieee80211_band band, bool init)
2723 {
2724         int i, j;
2725         struct ieee80211_hw *hw = mvm->hw;
2726         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2727         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2728         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2729         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2730         struct ieee80211_supported_band *sband;
2731         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2732
2733         /* clear all non-persistent lq data */
2734         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2735
2736         sband = hw->wiphy->bands[band];
2737
2738         lq_sta->lq.sta_id = sta_priv->sta_id;
2739
2740         for (j = 0; j < LQ_SIZE; j++)
2741                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2742
2743         lq_sta->flush_timer = 0;
2744         lq_sta->last_tx = jiffies;
2745
2746         IWL_DEBUG_RATE(mvm,
2747                        "LQ: *** rate scale station global init for station %d ***\n",
2748                        sta_priv->sta_id);
2749         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2750          * the lowest or the highest rate.. Could consider using RSSI from
2751          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2752          * after assoc.. */
2753
2754         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2755         lq_sta->band = sband->band;
2756         /*
2757          * active legacy rates as per supported rates bitmap
2758          */
2759         supp = sta->supp_rates[sband->band];
2760         lq_sta->active_legacy_rate = 0;
2761         for_each_set_bit(i, &supp, BITS_PER_LONG)
2762                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2763
2764         /* TODO: should probably account for rx_highest for both HT/VHT */
2765         if (!vht_cap || !vht_cap->vht_supported)
2766                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
2767         else
2768                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
2769
2770         if (IWL_MVM_RS_DISABLE_P2P_MIMO && sta_priv->vif->p2p)
2771                 lq_sta->active_mimo2_rate = 0;
2772
2773         lq_sta->max_legacy_rate_idx =
2774                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2775         lq_sta->max_siso_rate_idx =
2776                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2777         lq_sta->max_mimo2_rate_idx =
2778                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2779
2780         IWL_DEBUG_RATE(mvm,
2781                        "RATE MASK: LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d\n",
2782                        lq_sta->active_legacy_rate,
2783                        lq_sta->active_siso_rate,
2784                        lq_sta->active_mimo2_rate,
2785                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc);
2786         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2787                        lq_sta->max_legacy_rate_idx,
2788                        lq_sta->max_siso_rate_idx,
2789                        lq_sta->max_mimo2_rate_idx);
2790
2791         /* These values will be overridden later */
2792         lq_sta->lq.single_stream_ant_msk =
2793                 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
2794         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2795
2796         /* as default allow aggregation for all tids */
2797         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2798         lq_sta->is_agg = 0;
2799 #ifdef CONFIG_IWLWIFI_DEBUGFS
2800         iwl_mvm_reset_frame_stats(mvm);
2801 #endif
2802         rs_initialize_lq(mvm, sta, lq_sta, band, init);
2803 }
2804
2805 static void rs_rate_update(void *mvm_r,
2806                            struct ieee80211_supported_band *sband,
2807                            struct cfg80211_chan_def *chandef,
2808                            struct ieee80211_sta *sta, void *priv_sta,
2809                            u32 changed)
2810 {
2811         u8 tid;
2812         struct iwl_op_mode *op_mode  =
2813                         (struct iwl_op_mode *)mvm_r;
2814         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2815
2816         /* Stop any ongoing aggregations as rs starts off assuming no agg */
2817         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2818                 ieee80211_stop_tx_ba_session(sta, tid);
2819
2820         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2821 }
2822
2823 #ifdef CONFIG_MAC80211_DEBUGFS
2824 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2825                                             struct iwl_lq_cmd *lq_cmd,
2826                                             enum ieee80211_band band,
2827                                             u32 ucode_rate)
2828 {
2829         struct rs_rate rate;
2830         int i;
2831         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2832         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2833         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2834
2835         for (i = 0; i < num_rates; i++)
2836                 lq_cmd->rs_table[i] = ucode_rate_le32;
2837
2838         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2839
2840         if (is_mimo(&rate))
2841                 lq_cmd->mimo_delim = num_rates - 1;
2842         else
2843                 lq_cmd->mimo_delim = 0;
2844
2845         lq_cmd->reduced_tpc = 0;
2846
2847         if (num_of_ant(ant) == 1)
2848                 lq_cmd->single_stream_ant_msk = ant;
2849
2850         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2851 }
2852 #endif /* CONFIG_MAC80211_DEBUGFS */
2853
2854 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2855                                      struct iwl_lq_sta *lq_sta,
2856                                      struct rs_rate *rate,
2857                                      __le32 *rs_table, int *rs_table_index,
2858                                      int num_rates, int num_retries,
2859                                      u8 valid_tx_ant, bool toggle_ant)
2860 {
2861         int i, j;
2862         __le32 ucode_rate;
2863         bool bottom_reached = false;
2864         int prev_rate_idx = rate->index;
2865         int end = LINK_QUAL_MAX_RETRY_NUM;
2866         int index = *rs_table_index;
2867
2868         for (i = 0; i < num_rates && index < end; i++) {
2869                 for (j = 0; j < num_retries && index < end; j++, index++) {
2870                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
2871                                                                          rate));
2872                         rs_table[index] = ucode_rate;
2873                         if (toggle_ant)
2874                                 rs_toggle_antenna(valid_tx_ant, rate);
2875                 }
2876
2877                 prev_rate_idx = rate->index;
2878                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2879                 if (bottom_reached && !is_legacy(rate))
2880                         break;
2881         }
2882
2883         if (!bottom_reached && !is_legacy(rate))
2884                 rate->index = prev_rate_idx;
2885
2886         *rs_table_index = index;
2887 }
2888
2889 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2890  * column the rate table should look like this:
2891  *
2892  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2893  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2894  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2895  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2896  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2897  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2898  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2899  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2900  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2901  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2902  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2903  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2904  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2905  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2906  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2907  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2908  */
2909 static void rs_build_rates_table(struct iwl_mvm *mvm,
2910                                  struct ieee80211_sta *sta,
2911                                  struct iwl_lq_sta *lq_sta,
2912                                  const struct rs_rate *initial_rate)
2913 {
2914         struct rs_rate rate;
2915         int num_rates, num_retries, index = 0;
2916         u8 valid_tx_ant = 0;
2917         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2918         bool toggle_ant = false;
2919         bool stbc_allowed = false;
2920
2921         memcpy(&rate, initial_rate, sizeof(rate));
2922
2923         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2924
2925         stbc_allowed = rs_stbc_allow(mvm, sta, lq_sta);
2926         if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS) {
2927                 u32 ss_params = RS_SS_PARAMS_VALID;
2928
2929                 if (stbc_allowed)
2930                         ss_params |= RS_SS_STBC_ALLOWED;
2931                 lq_cmd->ss_params = cpu_to_le32(ss_params);
2932         } else {
2933                 /* TODO: remove old API when min FW API hits 14 */
2934                 rate.stbc = stbc_allowed;
2935         }
2936
2937         if (is_siso(&rate)) {
2938                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
2939                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
2940         } else if (is_mimo(&rate)) {
2941                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
2942                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
2943         } else {
2944                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
2945                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
2946                 toggle_ant = true;
2947         }
2948
2949         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2950                                  num_rates, num_retries, valid_tx_ant,
2951                                  toggle_ant);
2952
2953         rs_get_lower_rate_down_column(lq_sta, &rate);
2954
2955         if (is_siso(&rate)) {
2956                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
2957                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
2958                 lq_cmd->mimo_delim = index;
2959         } else if (is_legacy(&rate)) {
2960                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
2961                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
2962         } else {
2963                 WARN_ON_ONCE(1);
2964         }
2965
2966         toggle_ant = true;
2967
2968         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2969                                  num_rates, num_retries, valid_tx_ant,
2970                                  toggle_ant);
2971
2972         rs_get_lower_rate_down_column(lq_sta, &rate);
2973
2974         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
2975         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
2976
2977         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2978                                  num_rates, num_retries, valid_tx_ant,
2979                                  toggle_ant);
2980
2981 }
2982
2983 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
2984                            struct ieee80211_sta *sta,
2985                            struct iwl_lq_sta *lq_sta,
2986                            const struct rs_rate *initial_rate)
2987 {
2988         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2989         struct iwl_mvm_sta *mvmsta;
2990         struct iwl_mvm_vif *mvmvif;
2991
2992         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
2993         lq_cmd->agg_time_limit =
2994                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
2995
2996 #ifdef CONFIG_MAC80211_DEBUGFS
2997         if (lq_sta->pers.dbg_fixed_rate) {
2998                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
2999                                                 lq_sta->band,
3000                                                 lq_sta->pers.dbg_fixed_rate);
3001                 return;
3002         }
3003 #endif
3004         if (WARN_ON_ONCE(!sta || !initial_rate))
3005                 return;
3006
3007         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3008
3009         if (num_of_ant(initial_rate->ant) == 1)
3010                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3011
3012         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3013         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3014
3015         if (num_of_ant(initial_rate->ant) == 1)
3016                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3017
3018         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3019
3020         /*
3021          * In case of low latency, tell the firwmare to leave a frame in the
3022          * Tx Fifo so that it can start a transaction in the same TxOP. This
3023          * basically allows the firmware to send bursts.
3024          */
3025         if (iwl_mvm_vif_low_latency(mvmvif)) {
3026                 lq_cmd->agg_frame_cnt_limit--;
3027
3028                 if (mvm->low_latency_agg_frame_limit)
3029                         lq_cmd->agg_frame_cnt_limit =
3030                                 min(lq_cmd->agg_frame_cnt_limit,
3031                                     mvm->low_latency_agg_frame_limit);
3032         }
3033
3034         if (mvmsta->vif->p2p)
3035                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3036
3037         lq_cmd->agg_time_limit =
3038                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3039 }
3040
3041 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3042 {
3043         return hw->priv;
3044 }
3045 /* rate scale requires free function to be implemented */
3046 static void rs_free(void *mvm_rate)
3047 {
3048         return;
3049 }
3050
3051 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3052                         void *mvm_sta)
3053 {
3054         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3055         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3056
3057         IWL_DEBUG_RATE(mvm, "enter\n");
3058         IWL_DEBUG_RATE(mvm, "leave\n");
3059 }
3060
3061 #ifdef CONFIG_MAC80211_DEBUGFS
3062 int rs_pretty_print_rate(char *buf, const u32 rate)
3063 {
3064
3065         char *type, *bw;
3066         u8 mcs = 0, nss = 0;
3067         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3068
3069         if (!(rate & RATE_MCS_HT_MSK) &&
3070             !(rate & RATE_MCS_VHT_MSK)) {
3071                 int index = iwl_hwrate_to_plcp_idx(rate);
3072
3073                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3074                                rs_pretty_ant(ant),
3075                                index == IWL_RATE_INVALID ? "BAD" :
3076                                iwl_rate_mcs[index].mbps);
3077         }
3078
3079         if (rate & RATE_MCS_VHT_MSK) {
3080                 type = "VHT";
3081                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3082                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3083                        >> RATE_VHT_MCS_NSS_POS) + 1;
3084         } else if (rate & RATE_MCS_HT_MSK) {
3085                 type = "HT";
3086                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3087         } else {
3088                 type = "Unknown"; /* shouldn't happen */
3089         }
3090
3091         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3092         case RATE_MCS_CHAN_WIDTH_20:
3093                 bw = "20Mhz";
3094                 break;
3095         case RATE_MCS_CHAN_WIDTH_40:
3096                 bw = "40Mhz";
3097                 break;
3098         case RATE_MCS_CHAN_WIDTH_80:
3099                 bw = "80Mhz";
3100                 break;
3101         case RATE_MCS_CHAN_WIDTH_160:
3102                 bw = "160Mhz";
3103                 break;
3104         default:
3105                 bw = "BAD BW";
3106         }
3107
3108         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3109                        type, rs_pretty_ant(ant), bw, mcs, nss,
3110                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3111                        (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3112                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3113                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3114                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3115 }
3116
3117 /**
3118  * Program the device to use fixed rate for frame transmit
3119  * This is for debugging/testing only
3120  * once the device start use fixed rate, we need to reload the module
3121  * to being back the normal operation.
3122  */
3123 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3124                                 struct iwl_lq_sta *lq_sta)
3125 {
3126         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3127         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3128         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3129
3130         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3131                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3132
3133         if (lq_sta->pers.dbg_fixed_rate) {
3134                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3135                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3136         }
3137 }
3138
3139 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3140                         const char __user *user_buf, size_t count, loff_t *ppos)
3141 {
3142         struct iwl_lq_sta *lq_sta = file->private_data;
3143         struct iwl_mvm *mvm;
3144         char buf[64];
3145         size_t buf_size;
3146         u32 parsed_rate;
3147
3148         mvm = lq_sta->pers.drv;
3149         memset(buf, 0, sizeof(buf));
3150         buf_size = min(count, sizeof(buf) -  1);
3151         if (copy_from_user(buf, user_buf, buf_size))
3152                 return -EFAULT;
3153
3154         if (sscanf(buf, "%x", &parsed_rate) == 1)
3155                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3156         else
3157                 lq_sta->pers.dbg_fixed_rate = 0;
3158
3159         rs_program_fix_rate(mvm, lq_sta);
3160
3161         return count;
3162 }
3163
3164 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3165                         char __user *user_buf, size_t count, loff_t *ppos)
3166 {
3167         char *buff;
3168         int desc = 0;
3169         int i = 0;
3170         ssize_t ret;
3171
3172         struct iwl_lq_sta *lq_sta = file->private_data;
3173         struct iwl_mvm *mvm;
3174         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3175         struct rs_rate *rate = &tbl->rate;
3176         mvm = lq_sta->pers.drv;
3177         buff = kmalloc(2048, GFP_KERNEL);
3178         if (!buff)
3179                 return -ENOMEM;
3180
3181         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3182         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3183                         lq_sta->total_failed, lq_sta->total_success,
3184                         lq_sta->active_legacy_rate);
3185         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3186                         lq_sta->pers.dbg_fixed_rate);
3187         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3188             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3189             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3190             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3191         desc += sprintf(buff+desc, "lq type %s\n",
3192                         (is_legacy(rate)) ? "legacy" :
3193                         is_vht(rate) ? "VHT" : "HT");
3194         if (!is_legacy(rate)) {
3195                 desc += sprintf(buff+desc, " %s",
3196                    (is_siso(rate)) ? "SISO" : "MIMO2");
3197                    desc += sprintf(buff+desc, " %s",
3198                                    (is_ht20(rate)) ? "20MHz" :
3199                                    (is_ht40(rate)) ? "40MHz" :
3200                                    (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3201                    desc += sprintf(buff+desc, " %s %s %s\n",
3202                                    (rate->sgi) ? "SGI" : "NGI",
3203                                    (rate->ldpc) ? "LDPC" : "BCC",
3204                                    (lq_sta->is_agg) ? "AGG on" : "");
3205         }
3206         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3207                         lq_sta->last_rate_n_flags);
3208         desc += sprintf(buff+desc,
3209                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3210                         lq_sta->lq.flags,
3211                         lq_sta->lq.mimo_delim,
3212                         lq_sta->lq.single_stream_ant_msk,
3213                         lq_sta->lq.dual_stream_ant_msk);
3214
3215         desc += sprintf(buff+desc,
3216                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3217                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3218                         lq_sta->lq.agg_disable_start_th,
3219                         lq_sta->lq.agg_frame_cnt_limit);
3220
3221         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3222         desc += sprintf(buff+desc,
3223                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3224                         lq_sta->lq.initial_rate_index[0],
3225                         lq_sta->lq.initial_rate_index[1],
3226                         lq_sta->lq.initial_rate_index[2],
3227                         lq_sta->lq.initial_rate_index[3]);
3228
3229         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3230                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3231
3232                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3233                 desc += rs_pretty_print_rate(buff+desc, r);
3234         }
3235
3236         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3237         kfree(buff);
3238         return ret;
3239 }
3240
3241 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3242         .write = rs_sta_dbgfs_scale_table_write,
3243         .read = rs_sta_dbgfs_scale_table_read,
3244         .open = simple_open,
3245         .llseek = default_llseek,
3246 };
3247 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3248                         char __user *user_buf, size_t count, loff_t *ppos)
3249 {
3250         char *buff;
3251         int desc = 0;
3252         int i, j;
3253         ssize_t ret;
3254         struct iwl_scale_tbl_info *tbl;
3255         struct rs_rate *rate;
3256         struct iwl_lq_sta *lq_sta = file->private_data;
3257
3258         buff = kmalloc(1024, GFP_KERNEL);
3259         if (!buff)
3260                 return -ENOMEM;
3261
3262         for (i = 0; i < LQ_SIZE; i++) {
3263                 tbl = &(lq_sta->lq_info[i]);
3264                 rate = &tbl->rate;
3265                 desc += sprintf(buff+desc,
3266                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3267                                 "index=%d\n",
3268                                 lq_sta->active_tbl == i ? "*" : "x",
3269                                 rate->type,
3270                                 rate->sgi,
3271                                 is_ht20(rate) ? "20Mhz" :
3272                                 is_ht40(rate) ? "40Mhz" :
3273                                 is_ht80(rate) ? "80Mhz" : "ERR",
3274                                 rate->index);
3275                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3276                         desc += sprintf(buff+desc,
3277                                 "counter=%d success=%d %%=%d\n",
3278                                 tbl->win[j].counter,
3279                                 tbl->win[j].success_counter,
3280                                 tbl->win[j].success_ratio);
3281                 }
3282         }
3283         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3284         kfree(buff);
3285         return ret;
3286 }
3287
3288 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3289         .read = rs_sta_dbgfs_stats_table_read,
3290         .open = simple_open,
3291         .llseek = default_llseek,
3292 };
3293
3294 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3295                                               char __user *user_buf,
3296                                               size_t count, loff_t *ppos)
3297 {
3298         static const char * const column_name[] = {
3299                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3300                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3301                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3302                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3303                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3304                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3305                 [RS_COLUMN_MIMO2] = "MIMO2",
3306                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3307         };
3308
3309         static const char * const rate_name[] = {
3310                 [IWL_RATE_1M_INDEX] = "1M",
3311                 [IWL_RATE_2M_INDEX] = "2M",
3312                 [IWL_RATE_5M_INDEX] = "5.5M",
3313                 [IWL_RATE_11M_INDEX] = "11M",
3314                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3315                 [IWL_RATE_9M_INDEX] = "9M",
3316                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3317                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3318                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3319                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3320                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3321                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3322                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3323                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3324                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3325         };
3326
3327         char *buff, *pos, *endpos;
3328         int col, rate;
3329         ssize_t ret;
3330         struct iwl_lq_sta *lq_sta = file->private_data;
3331         struct rs_rate_stats *stats;
3332         static const size_t bufsz = 1024;
3333
3334         buff = kmalloc(bufsz, GFP_KERNEL);
3335         if (!buff)
3336                 return -ENOMEM;
3337
3338         pos = buff;
3339         endpos = pos + bufsz;
3340
3341         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3342         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3343                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3344         pos += scnprintf(pos, endpos - pos, "\n");
3345
3346         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3347                 pos += scnprintf(pos, endpos - pos,
3348                                  "%s,", column_name[col]);
3349
3350                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3351                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3352                         pos += scnprintf(pos, endpos - pos,
3353                                          "%llu/%llu,",
3354                                          stats->success,
3355                                          stats->total);
3356                 }
3357                 pos += scnprintf(pos, endpos - pos, "\n");
3358         }
3359
3360         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3361         kfree(buff);
3362         return ret;
3363 }
3364
3365 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3366                                                const char __user *user_buf,
3367                                                size_t count, loff_t *ppos)
3368 {
3369         struct iwl_lq_sta *lq_sta = file->private_data;
3370         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3371
3372         return count;
3373 }
3374
3375 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3376         .read = rs_sta_dbgfs_drv_tx_stats_read,
3377         .write = rs_sta_dbgfs_drv_tx_stats_write,
3378         .open = simple_open,
3379         .llseek = default_llseek,
3380 };
3381
3382 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3383 {
3384         struct iwl_lq_sta *lq_sta = mvm_sta;
3385         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3386                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
3387         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3388                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
3389         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3390                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3391         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3392                           &lq_sta->tx_agg_tid_en);
3393         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3394                           &lq_sta->pers.dbg_fixed_txp_reduction);
3395 }
3396
3397 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3398 {
3399 }
3400 #endif
3401
3402 /*
3403  * Initialization of rate scaling information is done by driver after
3404  * the station is added. Since mac80211 calls this function before a
3405  * station is added we ignore it.
3406  */
3407 static void rs_rate_init_stub(void *mvm_r,
3408                               struct ieee80211_supported_band *sband,
3409                               struct cfg80211_chan_def *chandef,
3410                               struct ieee80211_sta *sta, void *mvm_sta)
3411 {
3412 }
3413
3414 static const struct rate_control_ops rs_mvm_ops = {
3415         .name = RS_NAME,
3416         .tx_status = rs_mac80211_tx_status,
3417         .get_rate = rs_get_rate,
3418         .rate_init = rs_rate_init_stub,
3419         .alloc = rs_alloc,
3420         .free = rs_free,
3421         .alloc_sta = rs_alloc_sta,
3422         .free_sta = rs_free_sta,
3423         .rate_update = rs_rate_update,
3424 #ifdef CONFIG_MAC80211_DEBUGFS
3425         .add_sta_debugfs = rs_add_debugfs,
3426         .remove_sta_debugfs = rs_remove_debugfs,
3427 #endif
3428 };
3429
3430 int iwl_mvm_rate_control_register(void)
3431 {
3432         return ieee80211_rate_control_register(&rs_mvm_ops);
3433 }
3434
3435 void iwl_mvm_rate_control_unregister(void)
3436 {
3437         ieee80211_rate_control_unregister(&rs_mvm_ops);
3438 }
3439
3440 /**
3441  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3442  * Tx protection, according to this rquest and previous requests,
3443  * and send the LQ command.
3444  * @mvmsta: The station
3445  * @enable: Enable Tx protection?
3446  */
3447 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3448                           bool enable)
3449 {
3450         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3451
3452         lockdep_assert_held(&mvm->mutex);
3453
3454         if (enable) {
3455                 if (mvmsta->tx_protection == 0)
3456                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
3457                 mvmsta->tx_protection++;
3458         } else {
3459                 mvmsta->tx_protection--;
3460                 if (mvmsta->tx_protection == 0)
3461                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3462         }
3463
3464         return iwl_mvm_send_lq_cmd(mvm, lq, false);
3465 }