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
  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 5
 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_SISO_ANT_B,
 215                         RS_COLUMN_MIMO2,
 216                         RS_COLUMN_MIMO2_SGI,
 217                 },
 218         },
 219         [RS_COLUMN_LEGACY_ANT_B] = {
 220                 .mode = RS_LEGACY,
 221                 .ant = ANT_B,
 222                 .next_columns = {
 223                         RS_COLUMN_LEGACY_ANT_A,
 224                         RS_COLUMN_SISO_ANT_A,
 225                         RS_COLUMN_SISO_ANT_B,
 226                         RS_COLUMN_MIMO2,
 227                         RS_COLUMN_MIMO2_SGI,
 228                 },
 229         },
 230         [RS_COLUMN_SISO_ANT_A] = {
 231                 .mode = RS_SISO,
 232                 .ant = ANT_A,
 233                 .next_columns = {
 234                         RS_COLUMN_SISO_ANT_B,
 235                         RS_COLUMN_MIMO2,
 236                         RS_COLUMN_SISO_ANT_A_SGI,
 237                         RS_COLUMN_SISO_ANT_B_SGI,
 238                         RS_COLUMN_MIMO2_SGI,
 239                 },
 240                 .checks = {
 241                         rs_siso_allow,
 242                 },
 243         },
 244         [RS_COLUMN_SISO_ANT_B] = {
 245                 .mode = RS_SISO,
 246                 .ant = ANT_B,
 247                 .next_columns = {
 248                         RS_COLUMN_SISO_ANT_A,
 249                         RS_COLUMN_MIMO2,
 250                         RS_COLUMN_SISO_ANT_B_SGI,
 251                         RS_COLUMN_SISO_ANT_A_SGI,
 252                         RS_COLUMN_MIMO2_SGI,
 253                 },
 254                 .checks = {
 255                         rs_siso_allow,
 256                 },
 257         },
 258         [RS_COLUMN_SISO_ANT_A_SGI] = {
 259                 .mode = RS_SISO,
 260                 .ant = ANT_A,
 261                 .sgi = true,
 262                 .next_columns = {
 263                         RS_COLUMN_SISO_ANT_B_SGI,
 264                         RS_COLUMN_MIMO2_SGI,
 265                         RS_COLUMN_SISO_ANT_A,
 266                         RS_COLUMN_SISO_ANT_B,
 267                         RS_COLUMN_MIMO2,
 268                 },
 269                 .checks = {
 270                         rs_siso_allow,
 271                         rs_sgi_allow,
 272                 },
 273         },
 274         [RS_COLUMN_SISO_ANT_B_SGI] = {
 275                 .mode = RS_SISO,
 276                 .ant = ANT_B,
 277                 .sgi = true,
 278                 .next_columns = {
 279                         RS_COLUMN_SISO_ANT_A_SGI,
 280                         RS_COLUMN_MIMO2_SGI,
 281                         RS_COLUMN_SISO_ANT_B,
 282                         RS_COLUMN_SISO_ANT_A,
 283                         RS_COLUMN_MIMO2,
 284                 },
 285                 .checks = {
 286                         rs_siso_allow,
 287                         rs_sgi_allow,
 288                 },
 289         },
 290         [RS_COLUMN_MIMO2] = {
 291                 .mode = RS_MIMO2,
 292                 .ant = ANT_AB,
 293                 .next_columns = {
 294                         RS_COLUMN_SISO_ANT_A,
 295                         RS_COLUMN_SISO_ANT_B,
 296                         RS_COLUMN_SISO_ANT_A_SGI,
 297                         RS_COLUMN_SISO_ANT_B_SGI,
 298                         RS_COLUMN_MIMO2_SGI,
 299                 },
 300                 .checks = {
 301                         rs_mimo_allow,
 302                 },
 303         },
 304         [RS_COLUMN_MIMO2_SGI] = {
 305                 .mode = RS_MIMO2,
 306                 .ant = ANT_AB,
 307                 .sgi = true,
 308                 .next_columns = {
 309                         RS_COLUMN_SISO_ANT_A_SGI,
 310                         RS_COLUMN_SISO_ANT_B_SGI,
 311                         RS_COLUMN_SISO_ANT_A,
 312                         RS_COLUMN_SISO_ANT_B,
 313                         RS_COLUMN_MIMO2,
 314                 },
 315                 .checks = {
 316                         rs_mimo_allow,
 317                         rs_sgi_allow,
 318                 },
 319         },
 320 };
 321
 322 static inline u8 rs_extract_rate(u32 rate_n_flags)
 323 {
 324         /* also works for HT because bits 7:6 are zero there */
 325         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 326 }
 327
 328 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 329 {
 330         int idx = 0;
 331
 332         if (rate_n_flags & RATE_MCS_HT_MSK) {
 333                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 334                 idx += IWL_RATE_MCS_0_INDEX;
 335
 336                 /* skip 9M not supported in HT*/
 337                 if (idx >= IWL_RATE_9M_INDEX)
 338                         idx += 1;
 339                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 340                         return idx;
 341         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 342                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 343                 idx += IWL_RATE_MCS_0_INDEX;
 344
 345                 /* skip 9M not supported in VHT*/
 346                 if (idx >= IWL_RATE_9M_INDEX)
 347                         idx++;
 348                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 349                         return idx;
 350         } else {
 351                 /* legacy rate format, search for match in table */
 352
 353                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 354                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 355                         if (iwl_rates[idx].plcp == legacy_rate)
 356                                 return idx;
 357         }
 358
 359         return IWL_RATE_INVALID;
 360 }
 361
 362 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 363                                    struct sk_buff *skb,
 364                                    struct ieee80211_sta *sta,
 365                                    struct iwl_lq_sta *lq_sta);
 366 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 367                            struct ieee80211_sta *sta,
 368                            struct iwl_lq_sta *lq_sta,
 369                            const struct rs_rate *initial_rate);
 370 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 371
 372 /**
 373  * The following tables contain the expected throughput metrics for all rates
 374  *
 375  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 376  *
 377  * where invalid entries are zeros.
 378  *
 379  * CCK rates are only valid in legacy table and will only be used in G
 380  * (2.4 GHz) band.
 381  */
 382
 383 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 384         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 385 };
 386
 387 /* Expected TpT tables. 4 indexes:
 388  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 389  */
 390 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 391         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 392         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 393         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 394         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 395 };
 396
 397 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 398         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 399         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 400         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 401         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 402 };
 403
 404 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 405         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 406         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 407         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 408         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 409 };
 410
 411 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 412         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 413         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 414         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 415         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 416 };
 417
 418 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 419         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 420         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 421         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 422         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 423 };
 424
 425 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 426         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 427         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 428         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 429         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 430 };
 431
 432 /* mbps, mcs */
 433 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 434         {  "1", "BPSK DSSS"},
 435         {  "2", "QPSK DSSS"},
 436         {"5.5", "BPSK CCK"},
 437         { "11", "QPSK CCK"},
 438         {  "6", "BPSK 1/2"},
 439         {  "9", "BPSK 1/2"},
 440         { "12", "QPSK 1/2"},
 441         { "18", "QPSK 3/4"},
 442         { "24", "16QAM 1/2"},
 443         { "36", "16QAM 3/4"},
 444         { "48", "64QAM 2/3"},
 445         { "54", "64QAM 3/4"},
 446         { "60", "64QAM 5/6"},
 447 };
 448
 449 #define MCS_INDEX_PER_STREAM    (8)
 450
 451 static const char *rs_pretty_ant(u8 ant)
 452 {
 453         static const char * const ant_name[] = {
 454                 [ANT_NONE] = "None",
 455                 [ANT_A]    = "A",
 456                 [ANT_B]    = "B",
 457                 [ANT_AB]   = "AB",
 458                 [ANT_C]    = "C",
 459                 [ANT_AC]   = "AC",
 460                 [ANT_BC]   = "BC",
 461                 [ANT_ABC]  = "ABC",
 462         };
 463
 464         if (ant > ANT_ABC)
 465                 return "UNKNOWN";
 466
 467         return ant_name[ant];
 468 }
 469
 470 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 471 {
 472         static const char * const lq_types[] = {
 473                 [LQ_NONE] = "NONE",
 474                 [LQ_LEGACY_A] = "LEGACY_A",
 475                 [LQ_LEGACY_G] = "LEGACY_G",
 476                 [LQ_HT_SISO] = "HT SISO",
 477                 [LQ_HT_MIMO2] = "HT MIMO",
 478                 [LQ_VHT_SISO] = "VHT SISO",
 479                 [LQ_VHT_MIMO2] = "VHT MIMO",
 480         };
 481
 482         if (type < LQ_NONE || type >= LQ_MAX)
 483                 return "UNKNOWN";
 484
 485         return lq_types[type];
 486 }
 487
 488 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 489                                 const char *prefix)
 490 {
 491         IWL_DEBUG_RATE(mvm, "%s: (%s: %d) ANT: %s BW: %d SGI: %d\n",
 492                        prefix, rs_pretty_lq_type(rate->type),
 493                        rate->index, rs_pretty_ant(rate->ant),
 494                        rate->bw, rate->sgi);
 495 }
 496
 497 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 498 {
 499         window->data = 0;
 500         window->success_counter = 0;
 501         window->success_ratio = IWL_INVALID_VALUE;
 502         window->counter = 0;
 503         window->average_tpt = IWL_INVALID_VALUE;
 504 }
 505
 506 static void rs_rate_scale_clear_tbl_windows(struct iwl_scale_tbl_info *tbl)
 507 {
 508         int i;
 509
 510         for (i = 0; i < IWL_RATE_COUNT; i++)
 511                 rs_rate_scale_clear_window(&tbl->win[i]);
 512
 513         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 514                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 515 }
 516
 517 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 518 {
 519         return (ant_type & valid_antenna) == ant_type;
 520 }
 521
 522 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 523                                       struct iwl_lq_sta *lq_data, u8 tid,
 524                                       struct ieee80211_sta *sta)
 525 {
 526         int ret = -EAGAIN;
 527
 528         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 529                      sta->addr, tid);
 530         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 531         if (ret == -EAGAIN) {
 532                 /*
 533                  * driver and mac80211 is out of sync
 534                  * this might be cause by reloading firmware
 535                  * stop the tx ba session here
 536                  */
 537                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 538                         tid);
 539                 ieee80211_stop_tx_ba_session(sta, tid);
 540         }
 541         return ret;
 542 }
 543
 544 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 545                               struct iwl_lq_sta *lq_data,
 546                               struct ieee80211_sta *sta)
 547 {
 548         if (tid < IWL_MAX_TID_COUNT)
 549                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 550         else
 551                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 552                         tid, IWL_MAX_TID_COUNT);
 553 }
 554
 555 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 556 {
 557         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 558                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 559                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 560 }
 561
 562 /*
 563  * Static function to get the expected throughput from an iwl_scale_tbl_info
 564  * that wraps a NULL pointer check
 565  */
 566 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 567 {
 568         if (tbl->expected_tpt)
 569                 return tbl->expected_tpt[rs_index];
 570         return 0;
 571 }
 572
 573 /**
 574  * rs_collect_tx_data - Update the success/failure sliding window
 575  *
 576  * We keep a sliding window of the last 62 packets transmitted
 577  * at this rate.  window->data contains the bitmask of successful
 578  * packets.
 579  */
 580 static int _rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 581                                int scale_index, int attempts, int successes,
 582                                struct iwl_rate_scale_data *window)
 583 {
 584         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 585         s32 fail_count, tpt;
 586
 587         /* Get expected throughput */
 588         tpt = get_expected_tpt(tbl, scale_index);
 589
 590         /*
 591          * Keep track of only the latest 62 tx frame attempts in this rate's
 592          * history window; anything older isn't really relevant any more.
 593          * If we have filled up the sliding window, drop the oldest attempt;
 594          * if the oldest attempt (highest bit in bitmap) shows "success",
 595          * subtract "1" from the success counter (this is the main reason
 596          * we keep these bitmaps!).
 597          */
 598         while (attempts > 0) {
 599                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 600                         /* remove earliest */
 601                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 602
 603                         if (window->data & mask) {
 604                                 window->data &= ~mask;
 605                                 window->success_counter--;
 606                         }
 607                 }
 608
 609                 /* Increment frames-attempted counter */
 610                 window->counter++;
 611
 612                 /* Shift bitmap by one frame to throw away oldest history */
 613                 window->data <<= 1;
 614
 615                 /* Mark the most recent #successes attempts as successful */
 616                 if (successes > 0) {
 617                         window->success_counter++;
 618                         window->data |= 0x1;
 619                         successes--;
 620                 }
 621
 622                 attempts--;
 623         }
 624
 625         /* Calculate current success ratio, avoid divide-by-0! */
 626         if (window->counter > 0)
 627                 window->success_ratio = 128 * (100 * window->success_counter)
 628                                         / window->counter;
 629         else
 630                 window->success_ratio = IWL_INVALID_VALUE;
 631
 632         fail_count = window->counter - window->success_counter;
 633
 634         /* Calculate average throughput, if we have enough history. */
 635         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 636             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 637                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 638         else
 639                 window->average_tpt = IWL_INVALID_VALUE;
 640
 641         return 0;
 642 }
 643
 644 static int rs_collect_tx_data(struct iwl_lq_sta *lq_sta,
 645                               struct iwl_scale_tbl_info *tbl,
 646                               int scale_index, int attempts, int successes,
 647                               u8 reduced_txp)
 648 {
 649         struct iwl_rate_scale_data *window = NULL;
 650         int ret;
 651
 652         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 653                 return -EINVAL;
 654
 655         if (tbl->column != RS_COLUMN_INVALID) {
 656                 lq_sta->tx_stats[tbl->column][scale_index].total += attempts;
 657                 lq_sta->tx_stats[tbl->column][scale_index].success += successes;
 658         }
 659
 660         /* Select window for current tx bit rate */
 661         window = &(tbl->win[scale_index]);
 662
 663         ret = _rs_collect_tx_data(tbl, scale_index, attempts, successes,
 664                                   window);
 665         if (ret)
 666                 return ret;
 667
 668         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 669                 return -EINVAL;
 670
 671         window = &tbl->tpc_win[reduced_txp];
 672         return _rs_collect_tx_data(tbl, scale_index, attempts, successes,
 673                                    window);
 674 }
 675
 676 /* Convert rs_rate object into ucode rate bitmask */
 677 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 678                                   struct rs_rate *rate)
 679 {
 680         u32 ucode_rate = 0;
 681         int index = rate->index;
 682
 683         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 684                          RATE_MCS_ANT_ABC_MSK);
 685
 686         if (is_legacy(rate)) {
 687                 ucode_rate |= iwl_rates[index].plcp;
 688                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 689                         ucode_rate |= RATE_MCS_CCK_MSK;
 690                 return ucode_rate;
 691         }
 692
 693         if (is_ht(rate)) {
 694                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 695                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 696                         index = IWL_LAST_HT_RATE;
 697                 }
 698                 ucode_rate |= RATE_MCS_HT_MSK;
 699
 700                 if (is_ht_siso(rate))
 701                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 702                 else if (is_ht_mimo2(rate))
 703                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 704                 else
 705                         WARN_ON_ONCE(1);
 706         } else if (is_vht(rate)) {
 707                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 708                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 709                         index = IWL_LAST_VHT_RATE;
 710                 }
 711                 ucode_rate |= RATE_MCS_VHT_MSK;
 712                 if (is_vht_siso(rate))
 713                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 714                 else if (is_vht_mimo2(rate))
 715                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 716                 else
 717                         WARN_ON_ONCE(1);
 718
 719         } else {
 720                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 721         }
 722
 723         ucode_rate |= rate->bw;
 724         if (rate->sgi)
 725                 ucode_rate |= RATE_MCS_SGI_MSK;
 726
 727         return ucode_rate;
 728 }
 729
 730 /* Convert a ucode rate into an rs_rate object */
 731 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 732                                    enum ieee80211_band band,
 733                                    struct rs_rate *rate)
 734 {
 735         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 736         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 737         u8 nss;
 738
 739         memset(rate, 0, sizeof(*rate));
 740         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 741
 742         if (rate->index == IWL_RATE_INVALID)
 743                 return -EINVAL;
 744
 745         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 746
 747         /* Legacy */
 748         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 749             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 750                 if (num_of_ant == 1) {
 751                         if (band == IEEE80211_BAND_5GHZ)
 752                                 rate->type = LQ_LEGACY_A;
 753                         else
 754                                 rate->type = LQ_LEGACY_G;
 755                 }
 756
 757                 return 0;
 758         }
 759
 760         /* HT or VHT */
 761         if (ucode_rate & RATE_MCS_SGI_MSK)
 762                 rate->sgi = true;
 763
 764         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 765
 766         if (ucode_rate & RATE_MCS_HT_MSK) {
 767                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 768                        RATE_HT_MCS_NSS_POS) + 1;
 769
 770                 if (nss == 1) {
 771                         rate->type = LQ_HT_SISO;
 772                         WARN_ON_ONCE(num_of_ant != 1);
 773                 } else if (nss == 2) {
 774                         rate->type = LQ_HT_MIMO2;
 775                         WARN_ON_ONCE(num_of_ant != 2);
 776                 } else {
 777                         WARN_ON_ONCE(1);
 778                 }
 779         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 780                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 781                        RATE_VHT_MCS_NSS_POS) + 1;
 782
 783                 if (nss == 1) {
 784                         rate->type = LQ_VHT_SISO;
 785                         WARN_ON_ONCE(num_of_ant != 1);
 786                 } else if (nss == 2) {
 787                         rate->type = LQ_VHT_MIMO2;
 788                         WARN_ON_ONCE(num_of_ant != 2);
 789                 } else {
 790                         WARN_ON_ONCE(1);
 791                 }
 792         }
 793
 794         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
 795         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 796                      !is_vht(rate));
 797
 798         return 0;
 799 }
 800
 801 /* switch to another antenna/antennas and return 1 */
 802 /* if no other valid antenna found, return 0 */
 803 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 804 {
 805         u8 new_ant_type;
 806
 807         if (!rate->ant || rate->ant > ANT_ABC)
 808                 return 0;
 809
 810         if (!rs_is_valid_ant(valid_ant, rate->ant))
 811                 return 0;
 812
 813         new_ant_type = ant_toggle_lookup[rate->ant];
 814
 815         while ((new_ant_type != rate->ant) &&
 816                !rs_is_valid_ant(valid_ant, new_ant_type))
 817                 new_ant_type = ant_toggle_lookup[new_ant_type];
 818
 819         if (new_ant_type == rate->ant)
 820                 return 0;
 821
 822         rate->ant = new_ant_type;
 823
 824         return 1;
 825 }
 826
 827 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 828                                   struct rs_rate *rate)
 829 {
 830         if (is_legacy(rate))
 831                 return lq_sta->active_legacy_rate;
 832         else if (is_siso(rate))
 833                 return lq_sta->active_siso_rate;
 834         else if (is_mimo2(rate))
 835                 return lq_sta->active_mimo2_rate;
 836
 837         WARN_ON_ONCE(1);
 838         return 0;
 839 }
 840
 841 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 842                                 int rate_type)
 843 {
 844         u8 high = IWL_RATE_INVALID;
 845         u8 low = IWL_RATE_INVALID;
 846
 847         /* 802.11A or ht walks to the next literal adjacent rate in
 848          * the rate table */
 849         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 850                 int i;
 851                 u32 mask;
 852
 853                 /* Find the previous rate that is in the rate mask */
 854                 i = index - 1;
 855                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 856                         if (rate_mask & mask) {
 857                                 low = i;
 858                                 break;
 859                         }
 860                 }
 861
 862                 /* Find the next rate that is in the rate mask */
 863                 i = index + 1;
 864                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 865                         if (rate_mask & mask) {
 866                                 high = i;
 867                                 break;
 868                         }
 869                 }
 870
 871                 return (high << 8) | low;
 872         }
 873
 874         low = index;
 875         while (low != IWL_RATE_INVALID) {
 876                 low = iwl_rates[low].prev_rs;
 877                 if (low == IWL_RATE_INVALID)
 878                         break;
 879                 if (rate_mask & (1 << low))
 880                         break;
 881                 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
 882         }
 883
 884         high = index;
 885         while (high != IWL_RATE_INVALID) {
 886                 high = iwl_rates[high].next_rs;
 887                 if (high == IWL_RATE_INVALID)
 888                         break;
 889                 if (rate_mask & (1 << high))
 890                         break;
 891                 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
 892         }
 893
 894         return (high << 8) | low;
 895 }
 896
 897 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
 898                                      struct rs_rate *rate)
 899 {
 900         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
 901 }
 902
 903 /* Get the next supported lower rate in the current column.
 904  * Return true if bottom rate in the current column was reached
 905  */
 906 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
 907                                         struct rs_rate *rate)
 908 {
 909         u8 low;
 910         u16 high_low;
 911         u16 rate_mask;
 912         struct iwl_mvm *mvm = lq_sta->drv;
 913
 914         rate_mask = rs_get_supported_rates(lq_sta, rate);
 915         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
 916                                         rate->type);
 917         low = high_low & 0xff;
 918
 919         /* Bottom rate of column reached */
 920         if (low == IWL_RATE_INVALID)
 921                 return true;
 922
 923         rate->index = low;
 924         return false;
 925 }
 926
 927 /* Get the next rate to use following a column downgrade */
 928 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
 929                                           struct rs_rate *rate)
 930 {
 931         struct iwl_mvm *mvm = lq_sta->drv;
 932
 933         if (is_legacy(rate)) {
 934                 /* No column to downgrade from Legacy */
 935                 return;
 936         } else if (is_siso(rate)) {
 937                 /* Downgrade to Legacy if we were in SISO */
 938                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 939                         rate->type = LQ_LEGACY_A;
 940                 else
 941                         rate->type = LQ_LEGACY_G;
 942
 943                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
 944
 945                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
 946                              rate->index > IWL_RATE_MCS_9_INDEX);
 947
 948                 rate->index = rs_ht_to_legacy[rate->index];
 949         } else {
 950                 /* Downgrade to SISO with same MCS if in MIMO  */
 951                 rate->type = is_vht_mimo2(rate) ?
 952                         LQ_VHT_SISO : LQ_HT_SISO;
 953         }
 954
 955
 956         if (num_of_ant(rate->ant) > 1)
 957                 rate->ant = first_antenna(mvm->fw->valid_tx_ant);
 958
 959         /* Relevant in both switching to SISO or Legacy */
 960         rate->sgi = false;
 961
 962         if (!rs_rate_supported(lq_sta, rate))
 963                 rs_get_lower_rate_in_column(lq_sta, rate);
 964 }
 965
 966 /* Simple function to compare two rate scale table types */
 967 static inline bool rs_rate_match(struct rs_rate *a,
 968                                  struct rs_rate *b)
 969 {
 970         return (a->type == b->type) && (a->ant == b->ant) && (a->sgi == b->sgi);
 971 }
 972
 973 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
 974 {
 975         if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 976                 return RATE_MCS_CHAN_WIDTH_40;
 977         else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 978                 return RATE_MCS_CHAN_WIDTH_80;
 979         else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
 980                 return RATE_MCS_CHAN_WIDTH_160;
 981
 982         return RATE_MCS_CHAN_WIDTH_20;
 983 }
 984
 985 /*
 986  * mac80211 sends us Tx status
 987  */
 988 static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
 989                          struct ieee80211_sta *sta, void *priv_sta,
 990                          struct sk_buff *skb)
 991 {
 992         int legacy_success;
 993         int retries;
 994         int mac_index, i;
 995         struct iwl_lq_sta *lq_sta = priv_sta;
 996         struct iwl_lq_cmd *table;
 997         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 998         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
 999         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1000         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1001         enum mac80211_rate_control_flags mac_flags;
1002         u32 ucode_rate;
1003         struct rs_rate rate;
1004         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1005         u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1006
1007         /* Treat uninitialized rate scaling data same as non-existing. */
1008         if (!lq_sta) {
1009                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1010                 return;
1011         } else if (!lq_sta->drv) {
1012                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1013                 return;
1014         }
1015
1016         if (!ieee80211_is_data(hdr->frame_control) ||
1017             info->flags & IEEE80211_TX_CTL_NO_ACK)
1018                 return;
1019
1020         /* This packet was aggregated but doesn't carry status info */
1021         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1022             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1023                 return;
1024
1025         /*
1026          * Ignore this Tx frame response if its initial rate doesn't match
1027          * that of latest Link Quality command.  There may be stragglers
1028          * from a previous Link Quality command, but we're no longer interested
1029          * in those; they're either from the "active" mode while we're trying
1030          * to check "search" mode, or a prior "search" mode after we've moved
1031          * to a new "search" mode (which might become the new "active" mode).
1032          */
1033         table = &lq_sta->lq;
1034         ucode_rate = le32_to_cpu(table->rs_table[0]);
1035         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1036         if (info->band == IEEE80211_BAND_5GHZ)
1037                 rate.index -= IWL_FIRST_OFDM_RATE;
1038         mac_flags = info->status.rates[0].flags;
1039         mac_index = info->status.rates[0].idx;
1040         /* For HT packets, map MCS to PLCP */
1041         if (mac_flags & IEEE80211_TX_RC_MCS) {
1042                 /* Remove # of streams */
1043                 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1044                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1045                         mac_index++;
1046                 /*
1047                  * mac80211 HT index is always zero-indexed; we need to move
1048                  * HT OFDM rates after CCK rates in 2.4 GHz band
1049                  */
1050                 if (info->band == IEEE80211_BAND_2GHZ)
1051                         mac_index += IWL_FIRST_OFDM_RATE;
1052         } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1053                 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1054                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1055                         mac_index++;
1056         }
1057
1058         /* Here we actually compare this rate to the latest LQ command */
1059         if ((mac_index < 0) ||
1060             (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1061             (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1062             (rate.ant != info->status.antenna) ||
1063             (!!(ucode_rate & RATE_MCS_HT_MSK) !=
1064              !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
1065             (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
1066              !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
1067             (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
1068              !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
1069             (rate.index != mac_index)) {
1070                 IWL_DEBUG_RATE(mvm,
1071                                "initial rate %d does not match %d (0x%x)\n",
1072                                mac_index, rate.index, ucode_rate);
1073                 /*
1074                  * Since rates mis-match, the last LQ command may have failed.
1075                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1076                  * ... driver.
1077                  */
1078                 lq_sta->missed_rate_counter++;
1079                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
1080                         lq_sta->missed_rate_counter = 0;
1081                         IWL_DEBUG_RATE(mvm,
1082                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1083                                        lq_sta->rs_state);
1084                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1085                 }
1086                 /* Regardless, ignore this status info for outdated rate */
1087                 return;
1088         } else
1089                 /* Rate did match, so reset the missed_rate_counter */
1090                 lq_sta->missed_rate_counter = 0;
1091
1092         /* Figure out if rate scale algorithm is in active or search table */
1093         if (rs_rate_match(&rate,
1094                           &(lq_sta->lq_info[lq_sta->active_tbl].rate))) {
1095                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1096                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1097         } else if (rs_rate_match(&rate,
1098                          &lq_sta->lq_info[1 - lq_sta->active_tbl].rate)) {
1099                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1100                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1101         } else {
1102                 IWL_DEBUG_RATE(mvm,
1103                                "Neither active nor search matches tx rate\n");
1104                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1105                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1106                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1107                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1108                 rs_dump_rate(mvm, &rate, "ACTUAL");
1109
1110                 /*
1111                  * no matching table found, let's by-pass the data collection
1112                  * and continue to perform rate scale to find the rate table
1113                  */
1114                 rs_stay_in_table(lq_sta, true);
1115                 goto done;
1116         }
1117
1118         /*
1119          * Updating the frame history depends on whether packets were
1120          * aggregated.
1121          *
1122          * For aggregation, all packets were transmitted at the same rate, the
1123          * first index into rate scale table.
1124          */
1125         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1126                 ucode_rate = le32_to_cpu(table->rs_table[0]);
1127                 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1128                 rs_collect_tx_data(lq_sta, curr_tbl, rate.index,
1129                                    info->status.ampdu_len,
1130                                    info->status.ampdu_ack_len,
1131                                    reduced_txp);
1132
1133                 /* Update success/fail counts if not searching for new mode */
1134                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1135                         lq_sta->total_success += info->status.ampdu_ack_len;
1136                         lq_sta->total_failed += (info->status.ampdu_len -
1137                                         info->status.ampdu_ack_len);
1138                 }
1139         } else {
1140         /*
1141          * For legacy, update frame history with for each Tx retry.
1142          */
1143                 retries = info->status.rates[0].count - 1;
1144                 /* HW doesn't send more than 15 retries */
1145                 retries = min(retries, 15);
1146
1147                 /* The last transmission may have been successful */
1148                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1149                 /* Collect data for each rate used during failed TX attempts */
1150                 for (i = 0; i <= retries; ++i) {
1151                         ucode_rate = le32_to_cpu(table->rs_table[i]);
1152                         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1153                         /*
1154                          * Only collect stats if retried rate is in the same RS
1155                          * table as active/search.
1156                          */
1157                         if (rs_rate_match(&rate, &curr_tbl->rate))
1158                                 tmp_tbl = curr_tbl;
1159                         else if (rs_rate_match(&rate, &other_tbl->rate))
1160                                 tmp_tbl = other_tbl;
1161                         else
1162                                 continue;
1163
1164                         rs_collect_tx_data(lq_sta, tmp_tbl, rate.index, 1,
1165                                            i < retries ? 0 : legacy_success,
1166                                            reduced_txp);
1167                 }
1168
1169                 /* Update success/fail counts if not searching for new mode */
1170                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1171                         lq_sta->total_success += legacy_success;
1172                         lq_sta->total_failed += retries + (1 - legacy_success);
1173                 }
1174         }
1175         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1176         lq_sta->last_rate_n_flags = ucode_rate;
1177         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1178 done:
1179         /* See if there's a better rate or modulation mode to try. */
1180         if (sta && sta->supp_rates[sband->band])
1181                 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
1182 }
1183
1184 /*
1185  * Begin a period of staying with a selected modulation mode.
1186  * Set "stay_in_tbl" flag to prevent any mode switches.
1187  * Set frame tx success limits according to legacy vs. high-throughput,
1188  * and reset overall (spanning all rates) tx success history statistics.
1189  * These control how long we stay using same modulation mode before
1190  * searching for a new mode.
1191  */
1192 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1193                                  struct iwl_lq_sta *lq_sta)
1194 {
1195         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1196         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1197         if (is_legacy) {
1198                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1199                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1200                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1201         } else {
1202                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1203                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1204                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1205         }
1206         lq_sta->table_count = 0;
1207         lq_sta->total_failed = 0;
1208         lq_sta->total_success = 0;
1209         lq_sta->flush_timer = jiffies;
1210         lq_sta->visited_columns = 0;
1211 }
1212
1213 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1214                                       const struct rs_tx_column *column,
1215                                       u32 bw)
1216 {
1217         /* Used to choose among HT tables */
1218         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1219
1220         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1221                          column->mode != RS_SISO &&
1222                          column->mode != RS_MIMO2))
1223                 return expected_tpt_legacy;
1224
1225         /* Legacy rates have only one table */
1226         if (column->mode == RS_LEGACY)
1227                 return expected_tpt_legacy;
1228
1229         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1230         /* Choose among many HT tables depending on number of streams
1231          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1232          * status */
1233         if (column->mode == RS_SISO) {
1234                 switch (bw) {
1235                 case RATE_MCS_CHAN_WIDTH_20:
1236                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1237                         break;
1238                 case RATE_MCS_CHAN_WIDTH_40:
1239                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1240                         break;
1241                 case RATE_MCS_CHAN_WIDTH_80:
1242                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1243                         break;
1244                 default:
1245                         WARN_ON_ONCE(1);
1246                 }
1247         } else if (column->mode == RS_MIMO2) {
1248                 switch (bw) {
1249                 case RATE_MCS_CHAN_WIDTH_20:
1250                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1251                         break;
1252                 case RATE_MCS_CHAN_WIDTH_40:
1253                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1254                         break;
1255                 case RATE_MCS_CHAN_WIDTH_80:
1256                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1257                         break;
1258                 default:
1259                         WARN_ON_ONCE(1);
1260                 }
1261         } else {
1262                 WARN_ON_ONCE(1);
1263         }
1264
1265         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1266                 return ht_tbl_pointer[0];
1267         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1268                 return ht_tbl_pointer[1];
1269         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1270                 return ht_tbl_pointer[2];
1271         else                                            /* AGG+SGI */
1272                 return ht_tbl_pointer[3];
1273 }
1274
1275 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1276                                       struct iwl_scale_tbl_info *tbl)
1277 {
1278         struct rs_rate *rate = &tbl->rate;
1279         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1280
1281         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1282 }
1283
1284 /*
1285  * Find starting rate for new "search" high-throughput mode of modulation.
1286  * Goal is to find lowest expected rate (under perfect conditions) that is
1287  * above the current measured throughput of "active" mode, to give new mode
1288  * a fair chance to prove itself without too many challenges.
1289  *
1290  * This gets called when transitioning to more aggressive modulation
1291  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1292  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1293  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1294  * bit rate will typically need to increase, but not if performance was bad.
1295  */
1296 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1297                             struct iwl_lq_sta *lq_sta,
1298                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1299                             u16 rate_mask, s8 index)
1300 {
1301         /* "active" values */
1302         struct iwl_scale_tbl_info *active_tbl =
1303             &(lq_sta->lq_info[lq_sta->active_tbl]);
1304         s32 active_sr = active_tbl->win[index].success_ratio;
1305         s32 active_tpt = active_tbl->expected_tpt[index];
1306         /* expected "search" throughput */
1307         const u16 *tpt_tbl = tbl->expected_tpt;
1308
1309         s32 new_rate, high, low, start_hi;
1310         u16 high_low;
1311         s8 rate = index;
1312
1313         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1314
1315         while (1) {
1316                 high_low = rs_get_adjacent_rate(mvm, rate, rate_mask,
1317                                                 tbl->rate.type);
1318
1319                 low = high_low & 0xff;
1320                 high = (high_low >> 8) & 0xff;
1321
1322                 /*
1323                  * Lower the "search" bit rate, to give new "search" mode
1324                  * approximately the same throughput as "active" if:
1325                  *
1326                  * 1) "Active" mode has been working modestly well (but not
1327                  *    great), and expected "search" throughput (under perfect
1328                  *    conditions) at candidate rate is above the actual
1329                  *    measured "active" throughput (but less than expected
1330                  *    "active" throughput under perfect conditions).
1331                  * OR
1332                  * 2) "Active" mode has been working perfectly or very well
1333                  *    and expected "search" throughput (under perfect
1334                  *    conditions) at candidate rate is above expected
1335                  *    "active" throughput (under perfect conditions).
1336                  */
1337                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1338                      ((active_sr > RS_SR_FORCE_DECREASE) &&
1339                       (active_sr <= IWL_RATE_HIGH_TH) &&
1340                       (tpt_tbl[rate] <= active_tpt))) ||
1341                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1342                      (tpt_tbl[rate] > active_tpt))) {
1343                         /* (2nd or later pass)
1344                          * If we've already tried to raise the rate, and are
1345                          * now trying to lower it, use the higher rate. */
1346                         if (start_hi != IWL_RATE_INVALID) {
1347                                 new_rate = start_hi;
1348                                 break;
1349                         }
1350
1351                         new_rate = rate;
1352
1353                         /* Loop again with lower rate */
1354                         if (low != IWL_RATE_INVALID)
1355                                 rate = low;
1356
1357                         /* Lower rate not available, use the original */
1358                         else
1359                                 break;
1360
1361                 /* Else try to raise the "search" rate to match "active" */
1362                 } else {
1363                         /* (2nd or later pass)
1364                          * If we've already tried to lower the rate, and are
1365                          * now trying to raise it, use the lower rate. */
1366                         if (new_rate != IWL_RATE_INVALID)
1367                                 break;
1368
1369                         /* Loop again with higher rate */
1370                         else if (high != IWL_RATE_INVALID) {
1371                                 start_hi = high;
1372                                 rate = high;
1373
1374                         /* Higher rate not available, use the original */
1375                         } else {
1376                                 new_rate = rate;
1377                                 break;
1378                         }
1379                 }
1380         }
1381
1382         return new_rate;
1383 }
1384
1385 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1386 {
1387         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1388                 return RATE_MCS_CHAN_WIDTH_80;
1389         else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1390                 return RATE_MCS_CHAN_WIDTH_40;
1391
1392         return RATE_MCS_CHAN_WIDTH_20;
1393 }
1394
1395 /*
1396  * Check whether we should continue using same modulation mode, or
1397  * begin search for a new mode, based on:
1398  * 1) # tx successes or failures while using this mode
1399  * 2) # times calling this function
1400  * 3) elapsed time in this mode (not used, for now)
1401  */
1402 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1403 {
1404         struct iwl_scale_tbl_info *tbl;
1405         int active_tbl;
1406         int flush_interval_passed = 0;
1407         struct iwl_mvm *mvm;
1408
1409         mvm = lq_sta->drv;
1410         active_tbl = lq_sta->active_tbl;
1411
1412         tbl = &(lq_sta->lq_info[active_tbl]);
1413
1414         /* If we've been disallowing search, see if we should now allow it */
1415         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1416                 /* Elapsed time using current modulation mode */
1417                 if (lq_sta->flush_timer)
1418                         flush_interval_passed =
1419                                 time_after(jiffies,
1420                                            (unsigned long)(lq_sta->flush_timer +
1421                                                 RS_STAY_IN_COLUMN_TIMEOUT));
1422
1423                 /*
1424                  * Check if we should allow search for new modulation mode.
1425                  * If many frames have failed or succeeded, or we've used
1426                  * this same modulation for a long time, allow search, and
1427                  * reset history stats that keep track of whether we should
1428                  * allow a new search.  Also (below) reset all bitmaps and
1429                  * stats in active history.
1430                  */
1431                 if (force_search ||
1432                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1433                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1434                     ((!lq_sta->search_better_tbl) &&
1435                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1436                         IWL_DEBUG_RATE(mvm,
1437                                        "LQ: stay is expired %d %d %d\n",
1438                                      lq_sta->total_failed,
1439                                      lq_sta->total_success,
1440                                      flush_interval_passed);
1441
1442                         /* Allow search for new mode */
1443                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1444                         IWL_DEBUG_RATE(mvm,
1445                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1446                         lq_sta->total_failed = 0;
1447                         lq_sta->total_success = 0;
1448                         lq_sta->flush_timer = 0;
1449                         /* mark the current column as visited */
1450                         lq_sta->visited_columns = BIT(tbl->column);
1451                 /*
1452                  * Else if we've used this modulation mode enough repetitions
1453                  * (regardless of elapsed time or success/failure), reset
1454                  * history bitmaps and rate-specific stats for all rates in
1455                  * active table.
1456                  */
1457                 } else {
1458                         lq_sta->table_count++;
1459                         if (lq_sta->table_count >=
1460                             lq_sta->table_count_limit) {
1461                                 lq_sta->table_count = 0;
1462
1463                                 IWL_DEBUG_RATE(mvm,
1464                                                "LQ: stay in table clear win\n");
1465                                 rs_rate_scale_clear_tbl_windows(tbl);
1466                         }
1467                 }
1468
1469                 /* If transitioning to allow "search", reset all history
1470                  * bitmaps and stats in active table (this will become the new
1471                  * "search" table). */
1472                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1473                         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
1474                         rs_rate_scale_clear_tbl_windows(tbl);
1475                 }
1476         }
1477 }
1478
1479 /*
1480  * setup rate table in uCode
1481  */
1482 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1483                                struct ieee80211_sta *sta,
1484                                struct iwl_lq_sta *lq_sta,
1485                                struct rs_rate *rate)
1486 {
1487         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
1488         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1489 }
1490
1491 static u8 rs_get_tid(struct iwl_lq_sta *lq_data,
1492                      struct ieee80211_hdr *hdr)
1493 {
1494         u8 tid = IWL_MAX_TID_COUNT;
1495
1496         if (ieee80211_is_data_qos(hdr->frame_control)) {
1497                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1498                 tid = qc[0] & 0xf;
1499         }
1500
1501         if (unlikely(tid > IWL_MAX_TID_COUNT))
1502                 tid = IWL_MAX_TID_COUNT;
1503
1504         return tid;
1505 }
1506
1507 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1508                                          struct iwl_lq_sta *lq_sta,
1509                                          struct ieee80211_sta *sta,
1510                                          struct iwl_scale_tbl_info *tbl)
1511 {
1512         int i, j, n;
1513         enum rs_column next_col_id;
1514         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1515         const struct rs_tx_column *next_col;
1516         allow_column_func_t allow_func;
1517         u8 valid_ants = mvm->fw->valid_tx_ant;
1518         const u16 *expected_tpt_tbl;
1519         s32 tpt, max_expected_tpt;
1520
1521         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1522                 next_col_id = curr_col->next_columns[i];
1523
1524                 if (next_col_id == RS_COLUMN_INVALID)
1525                         continue;
1526
1527                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1528                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1529                                        next_col_id);
1530                         continue;
1531                 }
1532
1533                 next_col = &rs_tx_columns[next_col_id];
1534
1535                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1536                         IWL_DEBUG_RATE(mvm,
1537                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1538                                        next_col_id, valid_ants, next_col->ant);
1539                         continue;
1540                 }
1541
1542                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1543                         allow_func = next_col->checks[j];
1544                         if (allow_func && !allow_func(mvm, sta, tbl))
1545                                 break;
1546                 }
1547
1548                 if (j != MAX_COLUMN_CHECKS) {
1549                         IWL_DEBUG_RATE(mvm,
1550                                        "Skip column %d: not allowed (check %d failed)\n",
1551                                        next_col_id, j);
1552
1553                         continue;
1554                 }
1555
1556                 tpt = lq_sta->last_tpt / 100;
1557                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1558                                                              tbl->rate.bw);
1559                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1560                         continue;
1561
1562                 max_expected_tpt = 0;
1563                 for (n = 0; n < IWL_RATE_COUNT; n++)
1564                         if (expected_tpt_tbl[n] > max_expected_tpt)
1565                                 max_expected_tpt = expected_tpt_tbl[n];
1566
1567                 if (tpt >= max_expected_tpt) {
1568                         IWL_DEBUG_RATE(mvm,
1569                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1570                                        next_col_id, max_expected_tpt, tpt);
1571                         continue;
1572                 }
1573
1574                 break;
1575         }
1576
1577         if (i == MAX_NEXT_COLUMNS)
1578                 return RS_COLUMN_INVALID;
1579
1580         IWL_DEBUG_RATE(mvm, "Found potential column %d\n", next_col_id);
1581
1582         return next_col_id;
1583 }
1584
1585 static int rs_switch_to_column(struct iwl_mvm *mvm,
1586                                struct iwl_lq_sta *lq_sta,
1587                                struct ieee80211_sta *sta,
1588                                enum rs_column col_id)
1589 {
1590         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1591         struct iwl_scale_tbl_info *search_tbl =
1592                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1593         struct rs_rate *rate = &search_tbl->rate;
1594         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1595         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1596         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1597                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1598         u16 rate_mask = 0;
1599         u32 rate_idx = 0;
1600
1601         memcpy(search_tbl, tbl, sz);
1602
1603         rate->sgi = column->sgi;
1604         rate->ant = column->ant;
1605
1606         if (column->mode == RS_LEGACY) {
1607                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1608                         rate->type = LQ_LEGACY_A;
1609                 else
1610                         rate->type = LQ_LEGACY_G;
1611
1612                 rate_mask = lq_sta->active_legacy_rate;
1613         } else if (column->mode == RS_SISO) {
1614                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1615                 rate_mask = lq_sta->active_siso_rate;
1616         } else if (column->mode == RS_MIMO2) {
1617                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1618                 rate_mask = lq_sta->active_mimo2_rate;
1619         } else {
1620                 WARN_ON_ONCE("Bad column mode");
1621         }
1622
1623         rate->bw = rs_bw_from_sta_bw(sta);
1624         search_tbl->column = col_id;
1625         rs_set_expected_tpt_table(lq_sta, search_tbl);
1626
1627         lq_sta->visited_columns |= BIT(col_id);
1628
1629         /* Get the best matching rate if we're changing modes. e.g.
1630          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1631          */
1632         if (curr_column->mode != column->mode) {
1633                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1634                                             rate_mask, rate->index);
1635
1636                 if ((rate_idx == IWL_RATE_INVALID) ||
1637                     !(BIT(rate_idx) & rate_mask)) {
1638                         IWL_DEBUG_RATE(mvm,
1639                                        "can not switch with index %d"
1640                                        " rate mask %x\n",
1641                                        rate_idx, rate_mask);
1642
1643                         goto err;
1644                 }
1645
1646                 rate->index = rate_idx;
1647         }
1648
1649         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1650                        col_id, rate->index);
1651
1652         return 0;
1653
1654 err:
1655         rate->type = LQ_NONE;
1656         return -1;
1657 }
1658
1659 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1660                                          struct iwl_scale_tbl_info *tbl,
1661                                          s32 sr, int low, int high,
1662                                          int current_tpt,
1663                                          int low_tpt, int high_tpt)
1664 {
1665         enum rs_action action = RS_ACTION_STAY;
1666
1667         /* Too many failures, decrease rate */
1668         if ((sr <= RS_SR_FORCE_DECREASE) || (current_tpt == 0)) {
1669                 IWL_DEBUG_RATE(mvm,
1670                                "decrease rate because of low SR\n");
1671                 action = RS_ACTION_DOWNSCALE;
1672         /* No throughput measured yet for adjacent rates; try increase. */
1673         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1674                    (high_tpt == IWL_INVALID_VALUE)) {
1675                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) {
1676                         IWL_DEBUG_RATE(mvm,
1677                                        "Good SR and no high rate measurement. "
1678                                        "Increase rate\n");
1679                         action = RS_ACTION_UPSCALE;
1680                 } else if (low != IWL_RATE_INVALID) {
1681                         IWL_DEBUG_RATE(mvm,
1682                                        "Remain in current rate\n");
1683                         action = RS_ACTION_STAY;
1684                 }
1685         }
1686
1687         /* Both adjacent throughputs are measured, but neither one has better
1688          * throughput; we're using the best rate, don't change it!
1689          */
1690         else if ((low_tpt != IWL_INVALID_VALUE) &&
1691                  (high_tpt != IWL_INVALID_VALUE) &&
1692                  (low_tpt < current_tpt) &&
1693                  (high_tpt < current_tpt)) {
1694                 IWL_DEBUG_RATE(mvm,
1695                                "Both high and low are worse. "
1696                                "Maintain rate\n");
1697                 action = RS_ACTION_STAY;
1698         }
1699
1700         /* At least one adjacent rate's throughput is measured,
1701          * and may have better performance.
1702          */
1703         else {
1704                 /* Higher adjacent rate's throughput is measured */
1705                 if (high_tpt != IWL_INVALID_VALUE) {
1706                         /* Higher rate has better throughput */
1707                         if (high_tpt > current_tpt &&
1708                             sr >= IWL_RATE_INCREASE_TH) {
1709                                 IWL_DEBUG_RATE(mvm,
1710                                                "Higher rate is better and good "
1711                                                "SR. Increate rate\n");
1712                                 action = RS_ACTION_UPSCALE;
1713                         } else {
1714                                 IWL_DEBUG_RATE(mvm,
1715                                                "Higher rate isn't better OR "
1716                                                "no good SR. Maintain rate\n");
1717                                 action = RS_ACTION_STAY;
1718                         }
1719
1720                 /* Lower adjacent rate's throughput is measured */
1721                 } else if (low_tpt != IWL_INVALID_VALUE) {
1722                         /* Lower rate has better throughput */
1723                         if (low_tpt > current_tpt) {
1724                                 IWL_DEBUG_RATE(mvm,
1725                                                "Lower rate is better. "
1726                                                "Decrease rate\n");
1727                                 action = RS_ACTION_DOWNSCALE;
1728                         } else if (sr >= IWL_RATE_INCREASE_TH) {
1729                                 IWL_DEBUG_RATE(mvm,
1730                                                "Lower rate isn't better and "
1731                                                "good SR. Increase rate\n");
1732                                 action = RS_ACTION_UPSCALE;
1733                         }
1734                 }
1735         }
1736
1737         /* Sanity check; asked for decrease, but success rate or throughput
1738          * has been good at old rate.  Don't change it.
1739          */
1740         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID) &&
1741             ((sr > IWL_RATE_HIGH_TH) ||
1742              (current_tpt > (100 * tbl->expected_tpt[low])))) {
1743                 IWL_DEBUG_RATE(mvm,
1744                                "Sanity check failed. Maintain rate\n");
1745                 action = RS_ACTION_STAY;
1746         }
1747
1748         return action;
1749 }
1750
1751 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1752                                 int *weaker, int *stronger)
1753 {
1754         *weaker = index + TPC_TX_POWER_STEP;
1755         if (*weaker > TPC_MAX_REDUCTION)
1756                 *weaker = TPC_INVALID;
1757
1758         *stronger = index - TPC_TX_POWER_STEP;
1759         if (*stronger < 0)
1760                 *stronger = TPC_INVALID;
1761 }
1762
1763 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct rs_rate *rate,
1764                            enum ieee80211_band band)
1765 {
1766         int index = rate->index;
1767
1768         /*
1769          * allow tpc only if power management is enabled, or bt coex
1770          * activity grade allows it and we are on 2.4Ghz.
1771          */
1772         if (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM &&
1773             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1774                 return false;
1775
1776         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1777         if (is_legacy(rate))
1778                 return index == IWL_RATE_54M_INDEX;
1779         if (is_ht(rate))
1780                 return index == IWL_RATE_MCS_7_INDEX;
1781         if (is_vht(rate))
1782                 return index == IWL_RATE_MCS_7_INDEX ||
1783                        index == IWL_RATE_MCS_8_INDEX ||
1784                        index == IWL_RATE_MCS_9_INDEX;
1785
1786         WARN_ON_ONCE(1);
1787         return false;
1788 }
1789
1790 enum tpc_action {
1791         TPC_ACTION_STAY,
1792         TPC_ACTION_DECREASE,
1793         TPC_ACTION_INCREASE,
1794         TPC_ACTION_NO_RESTIRCTION,
1795 };
1796
1797 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1798                                          s32 sr, int weak, int strong,
1799                                          int current_tpt,
1800                                          int weak_tpt, int strong_tpt)
1801 {
1802         /* stay until we have valid tpt */
1803         if (current_tpt == IWL_INVALID_VALUE) {
1804                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1805                 return TPC_ACTION_STAY;
1806         }
1807
1808         /* Too many failures, increase txp */
1809         if (sr <= TPC_SR_FORCE_INCREASE || current_tpt == 0) {
1810                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1811                 return TPC_ACTION_NO_RESTIRCTION;
1812         }
1813
1814         /* try decreasing first if applicable */
1815         if (weak != TPC_INVALID) {
1816                 if (weak_tpt == IWL_INVALID_VALUE &&
1817                     (strong_tpt == IWL_INVALID_VALUE ||
1818                      current_tpt >= strong_tpt)) {
1819                         IWL_DEBUG_RATE(mvm,
1820                                        "no weak txp measurement. decrease txp\n");
1821                         return TPC_ACTION_DECREASE;
1822                 }
1823
1824                 if (weak_tpt > current_tpt) {
1825                         IWL_DEBUG_RATE(mvm,
1826                                        "lower txp has better tpt. decrease txp\n");
1827                         return TPC_ACTION_DECREASE;
1828                 }
1829         }
1830
1831         /* next, increase if needed */
1832         if (sr < TPC_SR_NO_INCREASE && strong != TPC_INVALID) {
1833                 if (weak_tpt == IWL_INVALID_VALUE &&
1834                     strong_tpt != IWL_INVALID_VALUE &&
1835                     current_tpt < strong_tpt) {
1836                         IWL_DEBUG_RATE(mvm,
1837                                        "higher txp has better tpt. increase txp\n");
1838                         return TPC_ACTION_INCREASE;
1839                 }
1840
1841                 if (weak_tpt < current_tpt &&
1842                     (strong_tpt == IWL_INVALID_VALUE ||
1843                      strong_tpt > current_tpt)) {
1844                         IWL_DEBUG_RATE(mvm,
1845                                        "lower txp has worse tpt. increase txp\n");
1846                         return TPC_ACTION_INCREASE;
1847                 }
1848         }
1849
1850         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1851         return TPC_ACTION_STAY;
1852 }
1853
1854 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1855                            struct ieee80211_sta *sta,
1856                            struct iwl_lq_sta *lq_sta,
1857                            struct iwl_scale_tbl_info *tbl)
1858 {
1859         struct iwl_mvm_sta *mvm_sta = (void *)sta->drv_priv;
1860         struct ieee80211_vif *vif = mvm_sta->vif;
1861         struct ieee80211_chanctx_conf *chanctx_conf;
1862         enum ieee80211_band band;
1863         struct iwl_rate_scale_data *window;
1864         struct rs_rate *rate = &tbl->rate;
1865         enum tpc_action action;
1866         s32 sr;
1867         u8 cur = lq_sta->lq.reduced_tpc;
1868         int current_tpt;
1869         int weak, strong;
1870         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1871
1872 #ifdef CONFIG_MAC80211_DEBUGFS
1873         if (lq_sta->dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1874                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d",
1875                                lq_sta->dbg_fixed_txp_reduction);
1876                 lq_sta->lq.reduced_tpc = lq_sta->dbg_fixed_txp_reduction;
1877                 return cur != lq_sta->dbg_fixed_txp_reduction;
1878         }
1879 #endif
1880
1881         rcu_read_lock();
1882         chanctx_conf = rcu_dereference(vif->chanctx_conf);
1883         if (WARN_ON(!chanctx_conf))
1884                 band = IEEE80211_NUM_BANDS;
1885         else
1886                 band = chanctx_conf->def.chan->band;
1887         rcu_read_unlock();
1888
1889         if (!rs_tpc_allowed(mvm, rate, band)) {
1890                 IWL_DEBUG_RATE(mvm,
1891                                "tpc is not allowed. remove txp restrictions");
1892                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1893                 return cur != TPC_NO_REDUCTION;
1894         }
1895
1896         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1897
1898         /* Collect measured throughputs for current and adjacent rates */
1899         window = tbl->tpc_win;
1900         sr = window[cur].success_ratio;
1901         current_tpt = window[cur].average_tpt;
1902         if (weak != TPC_INVALID)
1903                 weak_tpt = window[weak].average_tpt;
1904         if (strong != TPC_INVALID)
1905                 strong_tpt = window[strong].average_tpt;
1906
1907         IWL_DEBUG_RATE(mvm,
1908                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1909                        cur, current_tpt, sr, weak, strong,
1910                        weak_tpt, strong_tpt);
1911
1912         action = rs_get_tpc_action(mvm, sr, weak, strong,
1913                                    current_tpt, weak_tpt, strong_tpt);
1914
1915         /* override actions if we are on the edge */
1916         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
1917                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay");
1918                 action = TPC_ACTION_STAY;
1919         } else if (strong == TPC_INVALID &&
1920                    (action == TPC_ACTION_INCREASE ||
1921                     action == TPC_ACTION_NO_RESTIRCTION)) {
1922                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay");
1923                 action = TPC_ACTION_STAY;
1924         }
1925
1926         switch (action) {
1927         case TPC_ACTION_DECREASE:
1928                 lq_sta->lq.reduced_tpc = weak;
1929                 return true;
1930         case TPC_ACTION_INCREASE:
1931                 lq_sta->lq.reduced_tpc = strong;
1932                 return true;
1933         case TPC_ACTION_NO_RESTIRCTION:
1934                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1935                 return true;
1936         case TPC_ACTION_STAY:
1937                 /* do nothing */
1938                 break;
1939         }
1940         return false;
1941 }
1942
1943 /*
1944  * Do rate scaling and search for new modulation mode.
1945  */
1946 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1947                                   struct sk_buff *skb,
1948                                   struct ieee80211_sta *sta,
1949                                   struct iwl_lq_sta *lq_sta)
1950 {
1951         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1952         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1953         int low = IWL_RATE_INVALID;
1954         int high = IWL_RATE_INVALID;
1955         int index;
1956         struct iwl_rate_scale_data *window = NULL;
1957         int current_tpt = IWL_INVALID_VALUE;
1958         int low_tpt = IWL_INVALID_VALUE;
1959         int high_tpt = IWL_INVALID_VALUE;
1960         u32 fail_count;
1961         enum rs_action scale_action = RS_ACTION_STAY;
1962         u16 rate_mask;
1963         u8 update_lq = 0;
1964         struct iwl_scale_tbl_info *tbl, *tbl1;
1965         u8 active_tbl = 0;
1966         u8 done_search = 0;
1967         u16 high_low;
1968         s32 sr;
1969         u8 tid = IWL_MAX_TID_COUNT;
1970         u8 prev_agg = lq_sta->is_agg;
1971         struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
1972         struct iwl_mvm_tid_data *tid_data;
1973         struct rs_rate *rate;
1974
1975         /* Send management frames and NO_ACK data using lowest rate. */
1976         /* TODO: this could probably be improved.. */
1977         if (!ieee80211_is_data(hdr->frame_control) ||
1978             info->flags & IEEE80211_TX_CTL_NO_ACK)
1979                 return;
1980
1981         tid = rs_get_tid(lq_sta, hdr);
1982         if ((tid != IWL_MAX_TID_COUNT) &&
1983             (lq_sta->tx_agg_tid_en & (1 << tid))) {
1984                 tid_data = &sta_priv->tid_data[tid];
1985                 if (tid_data->state == IWL_AGG_OFF)
1986                         lq_sta->is_agg = 0;
1987                 else
1988                         lq_sta->is_agg = 1;
1989         } else {
1990                 lq_sta->is_agg = 0;
1991         }
1992
1993         /*
1994          * Select rate-scale / modulation-mode table to work with in
1995          * the rest of this function:  "search" if searching for better
1996          * modulation mode, or "active" if doing rate scaling within a mode.
1997          */
1998         if (!lq_sta->search_better_tbl)
1999                 active_tbl = lq_sta->active_tbl;
2000         else
2001                 active_tbl = 1 - lq_sta->active_tbl;
2002
2003         tbl = &(lq_sta->lq_info[active_tbl]);
2004         rate = &tbl->rate;
2005
2006         if (prev_agg != lq_sta->is_agg) {
2007                 IWL_DEBUG_RATE(mvm,
2008                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2009                                prev_agg, lq_sta->is_agg);
2010                 rs_set_expected_tpt_table(lq_sta, tbl);
2011         }
2012
2013         /* current tx rate */
2014         index = lq_sta->last_txrate_idx;
2015
2016         /* rates available for this association, and for modulation mode */
2017         rate_mask = rs_get_supported_rates(lq_sta, rate);
2018
2019         if (!(BIT(index) & rate_mask)) {
2020                 IWL_ERR(mvm, "Current Rate is not valid\n");
2021                 if (lq_sta->search_better_tbl) {
2022                         /* revert to active table if search table is not valid*/
2023                         rate->type = LQ_NONE;
2024                         lq_sta->search_better_tbl = 0;
2025                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2026                         rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2027                 }
2028                 return;
2029         }
2030
2031         /* Get expected throughput table and history window for current rate */
2032         if (!tbl->expected_tpt) {
2033                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2034                 return;
2035         }
2036
2037         /* force user max rate if set by user */
2038         if ((lq_sta->max_rate_idx != -1) &&
2039             (lq_sta->max_rate_idx < index)) {
2040                 index = lq_sta->max_rate_idx;
2041                 update_lq = 1;
2042                 window = &(tbl->win[index]);
2043                 IWL_DEBUG_RATE(mvm,
2044                                "Forcing user max rate %d\n",
2045                                index);
2046                 goto lq_update;
2047         }
2048
2049         window = &(tbl->win[index]);
2050
2051         /*
2052          * If there is not enough history to calculate actual average
2053          * throughput, keep analyzing results of more tx frames, without
2054          * changing rate or mode (bypass most of the rest of this function).
2055          * Set up new rate table in uCode only if old rate is not supported
2056          * in current association (use new rate found above).
2057          */
2058         fail_count = window->counter - window->success_counter;
2059         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2060             (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2061                 IWL_DEBUG_RATE(mvm,
2062                                "(%s: %d): Test Window: succ %d total %d\n",
2063                                rs_pretty_lq_type(rate->type),
2064                                index, window->success_counter, window->counter);
2065
2066                 /* Can't calculate this yet; not enough history */
2067                 window->average_tpt = IWL_INVALID_VALUE;
2068
2069                 /* Should we stay with this modulation mode,
2070                  * or search for a new one? */
2071                 rs_stay_in_table(lq_sta, false);
2072
2073                 goto out;
2074         }
2075         /* Else we have enough samples; calculate estimate of
2076          * actual average throughput */
2077         if (window->average_tpt != ((window->success_ratio *
2078                         tbl->expected_tpt[index] + 64) / 128)) {
2079                 window->average_tpt = ((window->success_ratio *
2080                                         tbl->expected_tpt[index] + 64) / 128);
2081         }
2082
2083         /* If we are searching for better modulation mode, check success. */
2084         if (lq_sta->search_better_tbl) {
2085                 /* If good success, continue using the "search" mode;
2086                  * no need to send new link quality command, since we're
2087                  * continuing to use the setup that we've been trying. */
2088                 if (window->average_tpt > lq_sta->last_tpt) {
2089                         IWL_DEBUG_RATE(mvm,
2090                                        "SWITCHING TO NEW TABLE SR: %d "
2091                                        "cur-tpt %d old-tpt %d\n",
2092                                        window->success_ratio,
2093                                        window->average_tpt,
2094                                        lq_sta->last_tpt);
2095
2096                         /* Swap tables; "search" becomes "active" */
2097                         lq_sta->active_tbl = active_tbl;
2098                         current_tpt = window->average_tpt;
2099                 /* Else poor success; go back to mode in "active" table */
2100                 } else {
2101                         IWL_DEBUG_RATE(mvm,
2102                                        "GOING BACK TO THE OLD TABLE: SR %d "
2103                                        "cur-tpt %d old-tpt %d\n",
2104                                        window->success_ratio,
2105                                        window->average_tpt,
2106                                        lq_sta->last_tpt);
2107
2108                         /* Nullify "search" table */
2109                         rate->type = LQ_NONE;
2110
2111                         /* Revert to "active" table */
2112                         active_tbl = lq_sta->active_tbl;
2113                         tbl = &(lq_sta->lq_info[active_tbl]);
2114
2115                         /* Revert to "active" rate and throughput info */
2116                         index = tbl->rate.index;
2117                         current_tpt = lq_sta->last_tpt;
2118
2119                         /* Need to set up a new rate table in uCode */
2120                         update_lq = 1;
2121                 }
2122
2123                 /* Either way, we've made a decision; modulation mode
2124                  * search is done, allow rate adjustment next time. */
2125                 lq_sta->search_better_tbl = 0;
2126                 done_search = 1;        /* Don't switch modes below! */
2127                 goto lq_update;
2128         }
2129
2130         /* (Else) not in search of better modulation mode, try for better
2131          * starting rate, while staying in this mode. */
2132         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2133         low = high_low & 0xff;
2134         high = (high_low >> 8) & 0xff;
2135
2136         /* If user set max rate, dont allow higher than user constrain */
2137         if ((lq_sta->max_rate_idx != -1) &&
2138             (lq_sta->max_rate_idx < high))
2139                 high = IWL_RATE_INVALID;
2140
2141         sr = window->success_ratio;
2142
2143         /* Collect measured throughputs for current and adjacent rates */
2144         current_tpt = window->average_tpt;
2145         if (low != IWL_RATE_INVALID)
2146                 low_tpt = tbl->win[low].average_tpt;
2147         if (high != IWL_RATE_INVALID)
2148                 high_tpt = tbl->win[high].average_tpt;
2149
2150         IWL_DEBUG_RATE(mvm,
2151                        "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2152                        rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2153                        low, high, low_tpt, high_tpt);
2154
2155         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2156                                           current_tpt, low_tpt, high_tpt);
2157
2158         /* Force a search in case BT doesn't like us being in MIMO */
2159         if (is_mimo(rate) &&
2160             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2161                 IWL_DEBUG_RATE(mvm,
2162                                "BT Coex forbids MIMO. Search for new config\n");
2163                 rs_stay_in_table(lq_sta, true);
2164                 goto lq_update;
2165         }
2166
2167         switch (scale_action) {
2168         case RS_ACTION_DOWNSCALE:
2169                 /* Decrease starting rate, update uCode's rate table */
2170                 if (low != IWL_RATE_INVALID) {
2171                         update_lq = 1;
2172                         index = low;
2173                 } else {
2174                         IWL_DEBUG_RATE(mvm,
2175                                        "At the bottom rate. Can't decrease\n");
2176                 }
2177
2178                 break;
2179         case RS_ACTION_UPSCALE:
2180                 /* Increase starting rate, update uCode's rate table */
2181                 if (high != IWL_RATE_INVALID) {
2182                         update_lq = 1;
2183                         index = high;
2184                 } else {
2185                         IWL_DEBUG_RATE(mvm,
2186                                        "At the top rate. Can't increase\n");
2187                 }
2188
2189                 break;
2190         case RS_ACTION_STAY:
2191                 /* No change */
2192                 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2193                 break;
2194         default:
2195                 break;
2196         }
2197
2198 lq_update:
2199         /* Replace uCode's rate table for the destination station. */
2200         if (update_lq) {
2201                 tbl->rate.index = index;
2202                 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2203         }
2204
2205         rs_stay_in_table(lq_sta, false);
2206
2207         /*
2208          * Search for new modulation mode if we're:
2209          * 1)  Not changing rates right now
2210          * 2)  Not just finishing up a search
2211          * 3)  Allowing a new search
2212          */
2213         if (!update_lq && !done_search &&
2214             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2215             && window->counter) {
2216                 enum rs_column next_column;
2217
2218                 /* Save current throughput to compare with "search" throughput*/
2219                 lq_sta->last_tpt = current_tpt;
2220
2221                 IWL_DEBUG_RATE(mvm,
2222                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2223                                update_lq, done_search, lq_sta->rs_state,
2224                                window->counter);
2225
2226                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2227                 if (next_column != RS_COLUMN_INVALID) {
2228                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2229                                                       next_column);
2230                         if (!ret)
2231                                 lq_sta->search_better_tbl = 1;
2232                 } else {
2233                         IWL_DEBUG_RATE(mvm,
2234                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2235                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2236                 }
2237
2238                 /* If new "search" mode was selected, set up in uCode table */
2239                 if (lq_sta->search_better_tbl) {
2240                         /* Access the "search" table, clear its history. */
2241                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2242                         rs_rate_scale_clear_tbl_windows(tbl);
2243
2244                         /* Use new "search" start rate */
2245                         index = tbl->rate.index;
2246
2247                         rs_dump_rate(mvm, &tbl->rate,
2248                                      "Switch to SEARCH TABLE:");
2249                         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
2250                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2251                 } else {
2252                         done_search = 1;
2253                 }
2254         }
2255
2256         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2257                 /* If the "active" (non-search) mode was legacy,
2258                  * and we've tried switching antennas,
2259                  * but we haven't been able to try HT modes (not available),
2260                  * stay with best antenna legacy modulation for a while
2261                  * before next round of mode comparisons. */
2262                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2263                 if (is_legacy(&tbl1->rate) && !sta->ht_cap.ht_supported) {
2264                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2265                         rs_set_stay_in_table(mvm, 1, lq_sta);
2266                 } else {
2267                 /* If we're in an HT mode, and all 3 mode switch actions
2268                  * have been tried and compared, stay in this best modulation
2269                  * mode for a while before next round of mode comparisons. */
2270                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2271                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2272                             (tid != IWL_MAX_TID_COUNT)) {
2273                                 tid_data = &sta_priv->tid_data[tid];
2274                                 if (tid_data->state == IWL_AGG_OFF) {
2275                                         IWL_DEBUG_RATE(mvm,
2276                                                        "try to aggregate tid %d\n",
2277                                                        tid);
2278                                         rs_tl_turn_on_agg(mvm, tid,
2279                                                           lq_sta, sta);
2280                                 }
2281                         }
2282                         rs_set_stay_in_table(mvm, 0, lq_sta);
2283                 }
2284         }
2285
2286 out:
2287         lq_sta->last_txrate_idx = index;
2288 }
2289
2290 /**
2291  * rs_initialize_lq - Initialize a station's hardware rate table
2292  *
2293  * The uCode's station table contains a table of fallback rates
2294  * for automatic fallback during transmission.
2295  *
2296  * NOTE: This sets up a default set of values.  These will be replaced later
2297  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2298  *       rc80211_simple.
2299  *
2300  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2301  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2302  *       which requires station table entry to exist).
2303  */
2304 static void rs_initialize_lq(struct iwl_mvm *mvm,
2305                              struct ieee80211_sta *sta,
2306                              struct iwl_lq_sta *lq_sta,
2307                              enum ieee80211_band band,
2308                              bool init)
2309 {
2310         struct iwl_scale_tbl_info *tbl;
2311         struct rs_rate *rate;
2312         int i;
2313         u8 active_tbl = 0;
2314         u8 valid_tx_ant;
2315
2316         if (!sta || !lq_sta)
2317                 return;
2318
2319         i = lq_sta->last_txrate_idx;
2320
2321         valid_tx_ant = mvm->fw->valid_tx_ant;
2322
2323         if (!lq_sta->search_better_tbl)
2324                 active_tbl = lq_sta->active_tbl;
2325         else
2326                 active_tbl = 1 - lq_sta->active_tbl;
2327
2328         tbl = &(lq_sta->lq_info[active_tbl]);
2329         rate = &tbl->rate;
2330
2331         if ((i < 0) || (i >= IWL_RATE_COUNT))
2332                 i = 0;
2333
2334         rate->index = i;
2335         rate->ant = first_antenna(valid_tx_ant);
2336         rate->sgi = false;
2337         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2338         if (band == IEEE80211_BAND_5GHZ)
2339                 rate->type = LQ_LEGACY_A;
2340         else
2341                 rate->type = LQ_LEGACY_G;
2342
2343         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2344         if (rate->ant == ANT_A)
2345                 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2346         else
2347                 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2348
2349         rs_set_expected_tpt_table(lq_sta, tbl);
2350         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2351         /* TODO restore station should remember the lq cmd */
2352         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2353 }
2354
2355 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2356                         struct ieee80211_tx_rate_control *txrc)
2357 {
2358         struct sk_buff *skb = txrc->skb;
2359         struct ieee80211_supported_band *sband = txrc->sband;
2360         struct iwl_op_mode *op_mode __maybe_unused =
2361                         (struct iwl_op_mode *)mvm_r;
2362         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2363         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2364         struct iwl_lq_sta *lq_sta = mvm_sta;
2365
2366         /* Get max rate if user set max rate */
2367         if (lq_sta) {
2368                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2369                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2370                     (lq_sta->max_rate_idx != -1))
2371                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2372                 if ((lq_sta->max_rate_idx < 0) ||
2373                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2374                         lq_sta->max_rate_idx = -1;
2375         }
2376
2377         /* Treat uninitialized rate scaling data same as non-existing. */
2378         if (lq_sta && !lq_sta->drv) {
2379                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2380                 mvm_sta = NULL;
2381         }
2382
2383         /* Send management frames and NO_ACK data using lowest rate. */
2384         if (rate_control_send_low(sta, mvm_sta, txrc))
2385                 return;
2386
2387         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2388                                   info->band, &info->control.rates[0]);
2389
2390         info->control.rates[0].count = 1;
2391 }
2392
2393 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2394                           gfp_t gfp)
2395 {
2396         struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2397         struct iwl_op_mode *op_mode __maybe_unused =
2398                         (struct iwl_op_mode *)mvm_rate;
2399         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2400
2401         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2402
2403         return &sta_priv->lq_sta;
2404 }
2405
2406 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2407                                        int nss)
2408 {
2409         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2410                 (0x3 << (2 * (nss - 1)));
2411         rx_mcs >>= (2 * (nss - 1));
2412
2413         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2414                 return IWL_RATE_MCS_7_INDEX;
2415         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2416                 return IWL_RATE_MCS_8_INDEX;
2417         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2418                 return IWL_RATE_MCS_9_INDEX;
2419
2420         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2421         return -1;
2422 }
2423
2424 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2425                                      struct ieee80211_sta_vht_cap *vht_cap,
2426                                      struct iwl_lq_sta *lq_sta)
2427 {
2428         int i;
2429         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2430
2431         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2432                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2433                         if (i == IWL_RATE_9M_INDEX)
2434                                 continue;
2435
2436                         /* Disable MCS9 as a workaround */
2437                         if (i == IWL_RATE_MCS_9_INDEX)
2438                                 continue;
2439
2440                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2441                         if (i == IWL_RATE_MCS_9_INDEX &&
2442                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2443                                 continue;
2444
2445                         lq_sta->active_siso_rate |= BIT(i);
2446                 }
2447         }
2448
2449         if (sta->rx_nss < 2)
2450                 return;
2451
2452         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2453         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2454                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2455                         if (i == IWL_RATE_9M_INDEX)
2456                                 continue;
2457
2458                         /* Disable MCS9 as a workaround */
2459                         if (i == IWL_RATE_MCS_9_INDEX)
2460                                 continue;
2461
2462                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2463                         if (i == IWL_RATE_MCS_9_INDEX &&
2464                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2465                                 continue;
2466
2467                         lq_sta->active_mimo2_rate |= BIT(i);
2468                 }
2469         }
2470 }
2471
2472 #ifdef CONFIG_IWLWIFI_DEBUGFS
2473 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm,
2474                                       struct iwl_mvm_frame_stats *stats)
2475 {
2476         spin_lock_bh(&mvm->drv_stats_lock);
2477         memset(stats, 0, sizeof(*stats));
2478         spin_unlock_bh(&mvm->drv_stats_lock);
2479 }
2480
2481 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm,
2482                                 struct iwl_mvm_frame_stats *stats,
2483                                 u32 rate, bool agg)
2484 {
2485         u8 nss = 0, mcs = 0;
2486
2487         spin_lock(&mvm->drv_stats_lock);
2488
2489         if (agg)
2490                 stats->agg_frames++;
2491
2492         stats->success_frames++;
2493
2494         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2495         case RATE_MCS_CHAN_WIDTH_20:
2496                 stats->bw_20_frames++;
2497                 break;
2498         case RATE_MCS_CHAN_WIDTH_40:
2499                 stats->bw_40_frames++;
2500                 break;
2501         case RATE_MCS_CHAN_WIDTH_80:
2502                 stats->bw_80_frames++;
2503                 break;
2504         default:
2505                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2506         }
2507
2508         if (rate & RATE_MCS_HT_MSK) {
2509                 stats->ht_frames++;
2510                 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2511                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2512         } else if (rate & RATE_MCS_VHT_MSK) {
2513                 stats->vht_frames++;
2514                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2515                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2516                        RATE_VHT_MCS_NSS_POS) + 1;
2517         } else {
2518                 stats->legacy_frames++;
2519         }
2520
2521         if (nss == 1)
2522                 stats->siso_frames++;
2523         else if (nss == 2)
2524                 stats->mimo2_frames++;
2525
2526         if (rate & RATE_MCS_SGI_MSK)
2527                 stats->sgi_frames++;
2528         else
2529                 stats->ngi_frames++;
2530
2531         stats->last_rates[stats->last_frame_idx] = rate;
2532         stats->last_frame_idx = (stats->last_frame_idx + 1) %
2533                 ARRAY_SIZE(stats->last_rates);
2534
2535         spin_unlock(&mvm->drv_stats_lock);
2536 }
2537 #endif
2538
2539 /*
2540  * Called after adding a new station to initialize rate scaling
2541  */
2542 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2543                           enum ieee80211_band band, bool init)
2544 {
2545         int i, j;
2546         struct ieee80211_hw *hw = mvm->hw;
2547         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2548         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2549         struct iwl_mvm_sta *sta_priv;
2550         struct iwl_lq_sta *lq_sta;
2551         struct ieee80211_supported_band *sband;
2552         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2553
2554         sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2555         lq_sta = &sta_priv->lq_sta;
2556         memset(lq_sta, 0, sizeof(*lq_sta));
2557
2558         sband = hw->wiphy->bands[band];
2559
2560         lq_sta->lq.sta_id = sta_priv->sta_id;
2561
2562         for (j = 0; j < LQ_SIZE; j++)
2563                 rs_rate_scale_clear_tbl_windows(&lq_sta->lq_info[j]);
2564
2565         lq_sta->flush_timer = 0;
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         IWL_DEBUG_RATE(mvm,
2610                        "SISO-RATE=%X MIMO2-RATE=%X VHT=%d\n",
2611                        lq_sta->active_siso_rate,
2612                        lq_sta->active_mimo2_rate,
2613                        lq_sta->is_vht);
2614
2615         /* These values will be overridden later */
2616         lq_sta->lq.single_stream_ant_msk =
2617                 first_antenna(mvm->fw->valid_tx_ant);
2618         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2619
2620         /* as default allow aggregation for all tids */
2621         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2622         lq_sta->drv = mvm;
2623
2624         /* Set last_txrate_idx to lowest rate */
2625         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2626         if (sband->band == IEEE80211_BAND_5GHZ)
2627                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2628         lq_sta->is_agg = 0;
2629 #ifdef CONFIG_MAC80211_DEBUGFS
2630         lq_sta->dbg_fixed_rate = 0;
2631         lq_sta->dbg_fixed_txp_reduction = TPC_INVALID;
2632 #endif
2633 #ifdef CONFIG_IWLWIFI_DEBUGFS
2634         iwl_mvm_reset_frame_stats(mvm, &mvm->drv_rx_stats);
2635 #endif
2636         rs_initialize_lq(mvm, sta, lq_sta, band, init);
2637 }
2638
2639 static void rs_rate_update(void *mvm_r,
2640                            struct ieee80211_supported_band *sband,
2641                            struct cfg80211_chan_def *chandef,
2642                            struct ieee80211_sta *sta, void *priv_sta,
2643                            u32 changed)
2644 {
2645         u8 tid;
2646         struct iwl_op_mode *op_mode  =
2647                         (struct iwl_op_mode *)mvm_r;
2648         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2649
2650         /* Stop any ongoing aggregations as rs starts off assuming no agg */
2651         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2652                 ieee80211_stop_tx_ba_session(sta, tid);
2653
2654         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2655 }
2656
2657 #ifdef CONFIG_MAC80211_DEBUGFS
2658 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2659                                             struct iwl_lq_cmd *lq_cmd,
2660                                             enum ieee80211_band band,
2661                                             u32 ucode_rate)
2662 {
2663         struct rs_rate rate;
2664         int i;
2665         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2666         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2667
2668         for (i = 0; i < num_rates; i++)
2669                 lq_cmd->rs_table[i] = ucode_rate_le32;
2670
2671         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2672
2673         if (is_mimo(&rate))
2674                 lq_cmd->mimo_delim = num_rates - 1;
2675         else
2676                 lq_cmd->mimo_delim = 0;
2677 }
2678 #endif /* CONFIG_MAC80211_DEBUGFS */
2679
2680 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2681                                      struct iwl_lq_sta *lq_sta,
2682                                      struct rs_rate *rate,
2683                                      __le32 *rs_table, int *rs_table_index,
2684                                      int num_rates, int num_retries,
2685                                      u8 valid_tx_ant, bool toggle_ant)
2686 {
2687         int i, j;
2688         __le32 ucode_rate;
2689         bool bottom_reached = false;
2690         int prev_rate_idx = rate->index;
2691         int end = LINK_QUAL_MAX_RETRY_NUM;
2692         int index = *rs_table_index;
2693
2694         for (i = 0; i < num_rates && index < end; i++) {
2695                 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, rate));
2696                 for (j = 0; j < num_retries && index < end; j++, index++)
2697                         rs_table[index] = ucode_rate;
2698
2699                 if (toggle_ant)
2700                         rs_toggle_antenna(valid_tx_ant, rate);
2701
2702                 prev_rate_idx = rate->index;
2703                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2704                 if (bottom_reached && !is_legacy(rate))
2705                         break;
2706         }
2707
2708         if (!bottom_reached)
2709                 rate->index = prev_rate_idx;
2710
2711         *rs_table_index = index;
2712 }
2713
2714 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2715  * column the rate table should look like this:
2716  *
2717  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2718  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2719  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2720  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2721  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2722  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2723  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2724  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2725  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2726  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2727  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2728  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2729  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2730  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2731  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2732  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2733  */
2734 static void rs_build_rates_table(struct iwl_mvm *mvm,
2735                                  struct iwl_lq_sta *lq_sta,
2736                                  const struct rs_rate *initial_rate)
2737 {
2738         struct rs_rate rate;
2739         int num_rates, num_retries, index = 0;
2740         u8 valid_tx_ant = 0;
2741         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2742         bool toggle_ant = false;
2743
2744         memcpy(&rate, initial_rate, sizeof(rate));
2745
2746         valid_tx_ant = mvm->fw->valid_tx_ant;
2747
2748         if (is_siso(&rate)) {
2749                 num_rates = RS_INITIAL_SISO_NUM_RATES;
2750                 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
2751         } else if (is_mimo(&rate)) {
2752                 num_rates = RS_INITIAL_MIMO_NUM_RATES;
2753                 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
2754         } else {
2755                 num_rates = RS_INITIAL_LEGACY_NUM_RATES;
2756                 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2757                 toggle_ant = true;
2758         }
2759
2760         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2761                                  num_rates, num_retries, valid_tx_ant,
2762                                  toggle_ant);
2763
2764         rs_get_lower_rate_down_column(lq_sta, &rate);
2765
2766         if (is_siso(&rate)) {
2767                 num_rates = RS_SECONDARY_SISO_NUM_RATES;
2768                 num_retries = RS_SECONDARY_SISO_RETRIES;
2769         } else if (is_legacy(&rate)) {
2770                 num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2771                 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2772         } else {
2773                 WARN_ON_ONCE(1);
2774         }
2775
2776         toggle_ant = true;
2777
2778         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2779                                  num_rates, num_retries, valid_tx_ant,
2780                                  toggle_ant);
2781
2782         rs_get_lower_rate_down_column(lq_sta, &rate);
2783
2784         num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2785         num_retries = RS_LEGACY_RETRIES_PER_RATE;
2786
2787         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2788                                  num_rates, num_retries, valid_tx_ant,
2789                                  toggle_ant);
2790
2791 }
2792
2793 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
2794                            struct ieee80211_sta *sta,
2795                            struct iwl_lq_sta *lq_sta,
2796                            const struct rs_rate *initial_rate)
2797 {
2798         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2799         u8 ant = initial_rate->ant;
2800
2801 #ifdef CONFIG_MAC80211_DEBUGFS
2802         if (lq_sta->dbg_fixed_rate) {
2803                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
2804                                                 lq_sta->band,
2805                                                 lq_sta->dbg_fixed_rate);
2806                 lq_cmd->reduced_tpc = 0;
2807                 ant = (lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) >>
2808                         RATE_MCS_ANT_POS;
2809         } else
2810 #endif
2811                 rs_build_rates_table(mvm, lq_sta, initial_rate);
2812
2813         if (num_of_ant(ant) == 1)
2814                 lq_cmd->single_stream_ant_msk = ant;
2815
2816         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2817         lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2818
2819         lq_cmd->agg_time_limit =
2820                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2821
2822         if (sta)
2823                 lq_cmd->agg_time_limit =
2824                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
2825 }
2826
2827 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2828 {
2829         return hw->priv;
2830 }
2831 /* rate scale requires free function to be implemented */
2832 static void rs_free(void *mvm_rate)
2833 {
2834         return;
2835 }
2836
2837 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2838                         void *mvm_sta)
2839 {
2840         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2841         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2842
2843         IWL_DEBUG_RATE(mvm, "enter\n");
2844         IWL_DEBUG_RATE(mvm, "leave\n");
2845 }
2846
2847 #ifdef CONFIG_MAC80211_DEBUGFS
2848 int rs_pretty_print_rate(char *buf, const u32 rate)
2849 {
2850
2851         char *type, *bw;
2852         u8 mcs = 0, nss = 0;
2853         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2854
2855         if (!(rate & RATE_MCS_HT_MSK) &&
2856             !(rate & RATE_MCS_VHT_MSK)) {
2857                 int index = iwl_hwrate_to_plcp_idx(rate);
2858
2859                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
2860                                rs_pretty_ant(ant),
2861                                index == IWL_RATE_INVALID ? "BAD" :
2862                                iwl_rate_mcs[index].mbps);
2863         }
2864
2865         if (rate & RATE_MCS_VHT_MSK) {
2866                 type = "VHT";
2867                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2868                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
2869                        >> RATE_VHT_MCS_NSS_POS) + 1;
2870         } else if (rate & RATE_MCS_HT_MSK) {
2871                 type = "HT";
2872                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
2873         } else {
2874                 type = "Unknown"; /* shouldn't happen */
2875         }
2876
2877         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2878         case RATE_MCS_CHAN_WIDTH_20:
2879                 bw = "20Mhz";
2880                 break;
2881         case RATE_MCS_CHAN_WIDTH_40:
2882                 bw = "40Mhz";
2883                 break;
2884         case RATE_MCS_CHAN_WIDTH_80:
2885                 bw = "80Mhz";
2886                 break;
2887         case RATE_MCS_CHAN_WIDTH_160:
2888                 bw = "160Mhz";
2889                 break;
2890         default:
2891                 bw = "BAD BW";
2892         }
2893
2894         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
2895                        type, rs_pretty_ant(ant), bw, mcs, nss,
2896                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
2897                        (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
2898                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
2899                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
2900                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
2901 }
2902
2903 /**
2904  * Program the device to use fixed rate for frame transmit
2905  * This is for debugging/testing only
2906  * once the device start use fixed rate, we need to reload the module
2907  * to being back the normal operation.
2908  */
2909 static void rs_program_fix_rate(struct iwl_mvm *mvm,
2910                                 struct iwl_lq_sta *lq_sta)
2911 {
2912         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2913         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2914         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2915
2916         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
2917                        lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2918
2919         if (lq_sta->dbg_fixed_rate) {
2920                 struct rs_rate rate;
2921                 rs_rate_from_ucode_rate(lq_sta->dbg_fixed_rate,
2922                                         lq_sta->band, &rate);
2923                 rs_fill_lq_cmd(mvm, NULL, lq_sta, &rate);
2924                 iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, false);
2925         }
2926 }
2927
2928 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2929                         const char __user *user_buf, size_t count, loff_t *ppos)
2930 {
2931         struct iwl_lq_sta *lq_sta = file->private_data;
2932         struct iwl_mvm *mvm;
2933         char buf[64];
2934         size_t buf_size;
2935         u32 parsed_rate;
2936
2937         mvm = lq_sta->drv;
2938         memset(buf, 0, sizeof(buf));
2939         buf_size = min(count, sizeof(buf) -  1);
2940         if (copy_from_user(buf, user_buf, buf_size))
2941                 return -EFAULT;
2942
2943         if (sscanf(buf, "%x", &parsed_rate) == 1)
2944                 lq_sta->dbg_fixed_rate = parsed_rate;
2945         else
2946                 lq_sta->dbg_fixed_rate = 0;
2947
2948         rs_program_fix_rate(mvm, lq_sta);
2949
2950         return count;
2951 }
2952
2953 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2954                         char __user *user_buf, size_t count, loff_t *ppos)
2955 {
2956         char *buff;
2957         int desc = 0;
2958         int i = 0;
2959         ssize_t ret;
2960
2961         struct iwl_lq_sta *lq_sta = file->private_data;
2962         struct iwl_mvm *mvm;
2963         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2964         struct rs_rate *rate = &tbl->rate;
2965         mvm = lq_sta->drv;
2966         buff = kmalloc(2048, GFP_KERNEL);
2967         if (!buff)
2968                 return -ENOMEM;
2969
2970         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2971         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2972                         lq_sta->total_failed, lq_sta->total_success,
2973                         lq_sta->active_legacy_rate);
2974         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2975                         lq_sta->dbg_fixed_rate);
2976         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2977             (mvm->fw->valid_tx_ant & ANT_A) ? "ANT_A," : "",
2978             (mvm->fw->valid_tx_ant & ANT_B) ? "ANT_B," : "",
2979             (mvm->fw->valid_tx_ant & ANT_C) ? "ANT_C" : "");
2980         desc += sprintf(buff+desc, "lq type %s\n",
2981                         (is_legacy(rate)) ? "legacy" :
2982                         is_vht(rate) ? "VHT" : "HT");
2983         if (!is_legacy(rate)) {
2984                 desc += sprintf(buff+desc, " %s",
2985                    (is_siso(rate)) ? "SISO" : "MIMO2");
2986                    desc += sprintf(buff+desc, " %s",
2987                                    (is_ht20(rate)) ? "20MHz" :
2988                                    (is_ht40(rate)) ? "40MHz" :
2989                                    (is_ht80(rate)) ? "80Mhz" : "BAD BW");
2990                    desc += sprintf(buff+desc, " %s %s\n",
2991                                    (rate->sgi) ? "SGI" : "NGI",
2992                                    (lq_sta->is_agg) ? "AGG on" : "");
2993         }
2994         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2995                         lq_sta->last_rate_n_flags);
2996         desc += sprintf(buff+desc,
2997                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
2998                         lq_sta->lq.flags,
2999                         lq_sta->lq.mimo_delim,
3000                         lq_sta->lq.single_stream_ant_msk,
3001                         lq_sta->lq.dual_stream_ant_msk);
3002
3003         desc += sprintf(buff+desc,
3004                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3005                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3006                         lq_sta->lq.agg_disable_start_th,
3007                         lq_sta->lq.agg_frame_cnt_limit);
3008
3009         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3010         desc += sprintf(buff+desc,
3011                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3012                         lq_sta->lq.initial_rate_index[0],
3013                         lq_sta->lq.initial_rate_index[1],
3014                         lq_sta->lq.initial_rate_index[2],
3015                         lq_sta->lq.initial_rate_index[3]);
3016
3017         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3018                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3019
3020                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3021                 desc += rs_pretty_print_rate(buff+desc, r);
3022         }
3023
3024         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3025         kfree(buff);
3026         return ret;
3027 }
3028
3029 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3030         .write = rs_sta_dbgfs_scale_table_write,
3031         .read = rs_sta_dbgfs_scale_table_read,
3032         .open = simple_open,
3033         .llseek = default_llseek,
3034 };
3035 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3036                         char __user *user_buf, size_t count, loff_t *ppos)
3037 {
3038         char *buff;
3039         int desc = 0;
3040         int i, j;
3041         ssize_t ret;
3042         struct iwl_scale_tbl_info *tbl;
3043         struct rs_rate *rate;
3044         struct iwl_lq_sta *lq_sta = file->private_data;
3045
3046         buff = kmalloc(1024, GFP_KERNEL);
3047         if (!buff)
3048                 return -ENOMEM;
3049
3050         for (i = 0; i < LQ_SIZE; i++) {
3051                 tbl = &(lq_sta->lq_info[i]);
3052                 rate = &tbl->rate;
3053                 desc += sprintf(buff+desc,
3054                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3055                                 "index=%d\n",
3056                                 lq_sta->active_tbl == i ? "*" : "x",
3057                                 rate->type,
3058                                 rate->sgi,
3059                                 is_ht20(rate) ? "20Mhz" :
3060                                 is_ht40(rate) ? "40Mhz" :
3061                                 is_ht80(rate) ? "80Mhz" : "ERR",
3062                                 rate->index);
3063                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3064                         desc += sprintf(buff+desc,
3065                                 "counter=%d success=%d %%=%d\n",
3066                                 tbl->win[j].counter,
3067                                 tbl->win[j].success_counter,
3068                                 tbl->win[j].success_ratio);
3069                 }
3070         }
3071         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3072         kfree(buff);
3073         return ret;
3074 }
3075
3076 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3077         .read = rs_sta_dbgfs_stats_table_read,
3078         .open = simple_open,
3079         .llseek = default_llseek,
3080 };
3081
3082 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3083                                               char __user *user_buf,
3084                                               size_t count, loff_t *ppos)
3085 {
3086         static const char * const column_name[] = {
3087                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3088                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3089                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3090                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3091                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3092                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3093                 [RS_COLUMN_MIMO2] = "MIMO2",
3094                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3095         };
3096
3097         static const char * const rate_name[] = {
3098                 [IWL_RATE_1M_INDEX] = "1M",
3099                 [IWL_RATE_2M_INDEX] = "2M",
3100                 [IWL_RATE_5M_INDEX] = "5.5M",
3101                 [IWL_RATE_11M_INDEX] = "11M",
3102                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3103                 [IWL_RATE_9M_INDEX] = "9M",
3104                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3105                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3106                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3107                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3108                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3109                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3110                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3111                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3112                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3113         };
3114
3115         char *buff, *pos, *endpos;
3116         int col, rate;
3117         ssize_t ret;
3118         struct iwl_lq_sta *lq_sta = file->private_data;
3119         struct rs_rate_stats *stats;
3120         static const size_t bufsz = 1024;
3121
3122         buff = kmalloc(bufsz, GFP_KERNEL);
3123         if (!buff)
3124                 return -ENOMEM;
3125
3126         pos = buff;
3127         endpos = pos + bufsz;
3128
3129         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3130         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3131                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3132         pos += scnprintf(pos, endpos - pos, "\n");
3133
3134         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3135                 pos += scnprintf(pos, endpos - pos,
3136                                  "%s,", column_name[col]);
3137
3138                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3139                         stats = &(lq_sta->tx_stats[col][rate]);
3140                         pos += scnprintf(pos, endpos - pos,
3141                                          "%llu/%llu,",
3142                                          stats->success,
3143                                          stats->total);
3144                 }
3145                 pos += scnprintf(pos, endpos - pos, "\n");
3146         }
3147
3148         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3149         kfree(buff);
3150         return ret;
3151 }
3152
3153 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3154                                                const char __user *user_buf,
3155                                                size_t count, loff_t *ppos)
3156 {
3157         struct iwl_lq_sta *lq_sta = file->private_data;
3158         memset(lq_sta->tx_stats, 0, sizeof(lq_sta->tx_stats));
3159
3160         return count;
3161 }
3162
3163 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3164         .read = rs_sta_dbgfs_drv_tx_stats_read,
3165         .write = rs_sta_dbgfs_drv_tx_stats_write,
3166         .open = simple_open,
3167         .llseek = default_llseek,
3168 };
3169
3170 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3171 {
3172         struct iwl_lq_sta *lq_sta = mvm_sta;
3173         lq_sta->rs_sta_dbgfs_scale_table_file =
3174                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3175                                     lq_sta, &rs_sta_dbgfs_scale_table_ops);
3176         lq_sta->rs_sta_dbgfs_stats_table_file =
3177                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3178                                     lq_sta, &rs_sta_dbgfs_stats_table_ops);
3179         lq_sta->rs_sta_dbgfs_drv_tx_stats_file =
3180                 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3181                                     lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3182         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3183                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3184                                   &lq_sta->tx_agg_tid_en);
3185         lq_sta->rs_sta_dbgfs_reduced_txp_file =
3186                 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3187                                   &lq_sta->dbg_fixed_txp_reduction);
3188 }
3189
3190 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3191 {
3192         struct iwl_lq_sta *lq_sta = mvm_sta;
3193         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3194         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3195         debugfs_remove(lq_sta->rs_sta_dbgfs_drv_tx_stats_file);
3196         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3197         debugfs_remove(lq_sta->rs_sta_dbgfs_reduced_txp_file);
3198 }
3199 #endif
3200
3201 /*
3202  * Initialization of rate scaling information is done by driver after
3203  * the station is added. Since mac80211 calls this function before a
3204  * station is added we ignore it.
3205  */
3206 static void rs_rate_init_stub(void *mvm_r,
3207                               struct ieee80211_supported_band *sband,
3208                               struct cfg80211_chan_def *chandef,
3209                               struct ieee80211_sta *sta, void *mvm_sta)
3210 {
3211 }
3212
3213 static const struct rate_control_ops rs_mvm_ops = {
3214         .name = RS_NAME,
3215         .tx_status = rs_tx_status,
3216         .get_rate = rs_get_rate,
3217         .rate_init = rs_rate_init_stub,
3218         .alloc = rs_alloc,
3219         .free = rs_free,
3220         .alloc_sta = rs_alloc_sta,
3221         .free_sta = rs_free_sta,
3222         .rate_update = rs_rate_update,
3223 #ifdef CONFIG_MAC80211_DEBUGFS
3224         .add_sta_debugfs = rs_add_debugfs,
3225         .remove_sta_debugfs = rs_remove_debugfs,
3226 #endif
3227 };
3228
3229 int iwl_mvm_rate_control_register(void)
3230 {
3231         return ieee80211_rate_control_register(&rs_mvm_ops);
3232 }
3233
3234 void iwl_mvm_rate_control_unregister(void)
3235 {
3236         ieee80211_rate_control_unregister(&rs_mvm_ops);
3237 }
3238
3239 /**
3240  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3241  * Tx protection, according to this rquest and previous requests,
3242  * and send the LQ command.
3243  * @mvmsta: The station
3244  * @enable: Enable Tx protection?
3245  */
3246 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3247                           bool enable)
3248 {
3249         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3250
3251         lockdep_assert_held(&mvm->mutex);
3252
3253         if (enable) {
3254                 if (mvmsta->tx_protection == 0)
3255                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
3256                 mvmsta->tx_protection++;
3257         } else {
3258                 mvmsta->tx_protection--;
3259                 if (mvmsta->tx_protection == 0)
3260                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3261         }
3262
3263         return iwl_mvm_send_lq_cmd(mvm, lq, false);
3264 }