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

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