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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
   4  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of version 2 of the GNU General Public License as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  18  *
  19  * The full GNU General Public License is included in this distribution in the
  20  * file called LICENSE.
  21  *
  22  * Contact Information:
  23  *  Intel Linux Wireless <ilw@linux.intel.com>
  24  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  25  *
  26  *****************************************************************************/
  27 #include <linux/kernel.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/slab.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37 #include "rs.h"
  38 #include "fw-api.h"
  39 #include "sta.h"
  40 #include "iwl-op-mode.h"
  41 #include "mvm.h"
  42 #include "debugfs.h"
  43
  44 #define RS_NAME "iwl-mvm-rs"
  45
  46 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  47
  48 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
  49  * Use this macro when dealing with thresholds consts set as a percentage
  50  */
  51 #define RS_PERCENT(x) (128 * x)
  52
  53 static u8 rs_ht_to_legacy[] = {
  54         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  55         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  56         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  57         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  58         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  59         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  60         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  61         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  62         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  63         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  64 };
  65
  66 static const u8 ant_toggle_lookup[] = {
  67         [ANT_NONE] = ANT_NONE,
  68         [ANT_A] = ANT_B,
  69         [ANT_B] = ANT_C,
  70         [ANT_AB] = ANT_BC,
  71         [ANT_C] = ANT_A,
  72         [ANT_AC] = ANT_AB,
  73         [ANT_BC] = ANT_AC,
  74         [ANT_ABC] = ANT_ABC,
  75 };
  76
  77 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  78         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  79                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  80                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  81                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  82                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  83                                     IWL_RATE_##rp##M_INDEX,           \
  84                                     IWL_RATE_##rn##M_INDEX }
  85
  86 #define IWL_DECLARE_MCS_RATE(s)                                           \
  87         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
  88                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
  89                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
  90                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
  91                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
  92                                        IWL_RATE_INVM_INDEX,               \
  93                                        IWL_RATE_INVM_INDEX }
  94
  95 /*
  96  * Parameter order:
  97  *   rate, ht rate, prev rate, next rate
  98  *
  99  * If there isn't a valid next or previous rate then INV is used which
 100  * maps to IWL_RATE_INVALID
 101  *
 102  */
 103 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 104         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 105         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 106         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 107         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 108         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 109         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 110         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 111         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 112         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 113         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 114         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 115         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 116         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 117         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 118         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 119 };
 120
 121 enum rs_action {
 122         RS_ACTION_STAY = 0,
 123         RS_ACTION_DOWNSCALE = -1,
 124         RS_ACTION_UPSCALE = 1,
 125 };
 126
 127 enum rs_column_mode {
 128         RS_INVALID = 0,
 129         RS_LEGACY,
 130         RS_SISO,
 131         RS_MIMO2,
 132 };
 133
 134 #define MAX_NEXT_COLUMNS 7
 135 #define MAX_COLUMN_CHECKS 3
 136
 137 struct rs_tx_column;
 138
 139 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 140                                      struct ieee80211_sta *sta,
 141                                      struct iwl_scale_tbl_info *tbl,
 142                                      const struct rs_tx_column *next_col);
 143
 144 struct rs_tx_column {
 145         enum rs_column_mode mode;
 146         u8 ant;
 147         bool sgi;
 148         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 149         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 150 };
 151
 152 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 153                          struct iwl_scale_tbl_info *tbl,
 154                          const struct rs_tx_column *next_col)
 155 {
 156         return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
 157 }
 158
 159 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 160                           struct iwl_scale_tbl_info *tbl,
 161                           const struct rs_tx_column *next_col)
 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(iwl_mvm_get_valid_tx_ant(mvm)) < 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                           const struct rs_tx_column *next_col)
 181 {
 182         if (!sta->ht_cap.ht_supported)
 183                 return false;
 184
 185         return true;
 186 }
 187
 188 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 189                          struct iwl_scale_tbl_info *tbl,
 190                          const struct rs_tx_column *next_col)
 191 {
 192         struct rs_rate *rate = &tbl->rate;
 193         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 194         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 195
 196         if (is_ht20(rate) && (ht_cap->cap &
 197                              IEEE80211_HT_CAP_SGI_20))
 198                 return true;
 199         if (is_ht40(rate) && (ht_cap->cap &
 200                              IEEE80211_HT_CAP_SGI_40))
 201                 return true;
 202         if (is_ht80(rate) && (vht_cap->cap &
 203                              IEEE80211_VHT_CAP_SHORT_GI_80))
 204                 return true;
 205
 206         return false;
 207 }
 208
 209 static const struct rs_tx_column rs_tx_columns[] = {
 210         [RS_COLUMN_LEGACY_ANT_A] = {
 211                 .mode = RS_LEGACY,
 212                 .ant = ANT_A,
 213                 .next_columns = {
 214                         RS_COLUMN_LEGACY_ANT_B,
 215                         RS_COLUMN_SISO_ANT_A,
 216                         RS_COLUMN_MIMO2,
 217                         RS_COLUMN_INVALID,
 218                         RS_COLUMN_INVALID,
 219                         RS_COLUMN_INVALID,
 220                         RS_COLUMN_INVALID,
 221                 },
 222                 .checks = {
 223                         rs_ant_allow,
 224                 },
 225         },
 226         [RS_COLUMN_LEGACY_ANT_B] = {
 227                 .mode = RS_LEGACY,
 228                 .ant = ANT_B,
 229                 .next_columns = {
 230                         RS_COLUMN_LEGACY_ANT_A,
 231                         RS_COLUMN_SISO_ANT_B,
 232                         RS_COLUMN_MIMO2,
 233                         RS_COLUMN_INVALID,
 234                         RS_COLUMN_INVALID,
 235                         RS_COLUMN_INVALID,
 236                         RS_COLUMN_INVALID,
 237                 },
 238                 .checks = {
 239                         rs_ant_allow,
 240                 },
 241         },
 242         [RS_COLUMN_SISO_ANT_A] = {
 243                 .mode = RS_SISO,
 244                 .ant = ANT_A,
 245                 .next_columns = {
 246                         RS_COLUMN_SISO_ANT_B,
 247                         RS_COLUMN_MIMO2,
 248                         RS_COLUMN_SISO_ANT_A_SGI,
 249                         RS_COLUMN_LEGACY_ANT_A,
 250                         RS_COLUMN_LEGACY_ANT_B,
 251                         RS_COLUMN_INVALID,
 252                         RS_COLUMN_INVALID,
 253                 },
 254                 .checks = {
 255                         rs_siso_allow,
 256                         rs_ant_allow,
 257                 },
 258         },
 259         [RS_COLUMN_SISO_ANT_B] = {
 260                 .mode = RS_SISO,
 261                 .ant = ANT_B,
 262                 .next_columns = {
 263                         RS_COLUMN_SISO_ANT_A,
 264                         RS_COLUMN_MIMO2,
 265                         RS_COLUMN_SISO_ANT_B_SGI,
 266                         RS_COLUMN_LEGACY_ANT_A,
 267                         RS_COLUMN_LEGACY_ANT_B,
 268                         RS_COLUMN_INVALID,
 269                         RS_COLUMN_INVALID,
 270                 },
 271                 .checks = {
 272                         rs_siso_allow,
 273                         rs_ant_allow,
 274                 },
 275         },
 276         [RS_COLUMN_SISO_ANT_A_SGI] = {
 277                 .mode = RS_SISO,
 278                 .ant = ANT_A,
 279                 .sgi = true,
 280                 .next_columns = {
 281                         RS_COLUMN_SISO_ANT_B_SGI,
 282                         RS_COLUMN_MIMO2_SGI,
 283                         RS_COLUMN_SISO_ANT_A,
 284                         RS_COLUMN_LEGACY_ANT_A,
 285                         RS_COLUMN_LEGACY_ANT_B,
 286                         RS_COLUMN_INVALID,
 287                         RS_COLUMN_INVALID,
 288                 },
 289                 .checks = {
 290                         rs_siso_allow,
 291                         rs_ant_allow,
 292                         rs_sgi_allow,
 293                 },
 294         },
 295         [RS_COLUMN_SISO_ANT_B_SGI] = {
 296                 .mode = RS_SISO,
 297                 .ant = ANT_B,
 298                 .sgi = true,
 299                 .next_columns = {
 300                         RS_COLUMN_SISO_ANT_A_SGI,
 301                         RS_COLUMN_MIMO2_SGI,
 302                         RS_COLUMN_SISO_ANT_B,
 303                         RS_COLUMN_LEGACY_ANT_A,
 304                         RS_COLUMN_LEGACY_ANT_B,
 305                         RS_COLUMN_INVALID,
 306                         RS_COLUMN_INVALID,
 307                 },
 308                 .checks = {
 309                         rs_siso_allow,
 310                         rs_ant_allow,
 311                         rs_sgi_allow,
 312                 },
 313         },
 314         [RS_COLUMN_MIMO2] = {
 315                 .mode = RS_MIMO2,
 316                 .ant = ANT_AB,
 317                 .next_columns = {
 318                         RS_COLUMN_SISO_ANT_A,
 319                         RS_COLUMN_MIMO2_SGI,
 320                         RS_COLUMN_LEGACY_ANT_A,
 321                         RS_COLUMN_LEGACY_ANT_B,
 322                         RS_COLUMN_INVALID,
 323                         RS_COLUMN_INVALID,
 324                         RS_COLUMN_INVALID,
 325                 },
 326                 .checks = {
 327                         rs_mimo_allow,
 328                 },
 329         },
 330         [RS_COLUMN_MIMO2_SGI] = {
 331                 .mode = RS_MIMO2,
 332                 .ant = ANT_AB,
 333                 .sgi = true,
 334                 .next_columns = {
 335                         RS_COLUMN_SISO_ANT_A_SGI,
 336                         RS_COLUMN_MIMO2,
 337                         RS_COLUMN_LEGACY_ANT_A,
 338                         RS_COLUMN_LEGACY_ANT_B,
 339                         RS_COLUMN_INVALID,
 340                         RS_COLUMN_INVALID,
 341                         RS_COLUMN_INVALID,
 342                 },
 343                 .checks = {
 344                         rs_mimo_allow,
 345                         rs_sgi_allow,
 346                 },
 347         },
 348 };
 349
 350 static inline u8 rs_extract_rate(u32 rate_n_flags)
 351 {
 352         /* also works for HT because bits 7:6 are zero there */
 353         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 354 }
 355
 356 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 357 {
 358         int idx = 0;
 359
 360         if (rate_n_flags & RATE_MCS_HT_MSK) {
 361                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 362                 idx += IWL_RATE_MCS_0_INDEX;
 363
 364                 /* skip 9M not supported in HT*/
 365                 if (idx >= IWL_RATE_9M_INDEX)
 366                         idx += 1;
 367                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 368                         return idx;
 369         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 370                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 371                 idx += IWL_RATE_MCS_0_INDEX;
 372
 373                 /* skip 9M not supported in VHT*/
 374                 if (idx >= IWL_RATE_9M_INDEX)
 375                         idx++;
 376                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 377                         return idx;
 378         } else {
 379                 /* legacy rate format, search for match in table */
 380
 381                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 382                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 383                         if (iwl_rates[idx].plcp == legacy_rate)
 384                                 return idx;
 385         }
 386
 387         return IWL_RATE_INVALID;
 388 }
 389
 390 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 391                                   struct ieee80211_sta *sta,
 392                                   struct iwl_lq_sta *lq_sta,
 393                                   int tid);
 394 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 395                            struct ieee80211_sta *sta,
 396                            struct iwl_lq_sta *lq_sta,
 397                            const struct rs_rate *initial_rate);
 398 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 399
 400 /**
 401  * The following tables contain the expected throughput metrics for all rates
 402  *
 403  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 404  *
 405  * where invalid entries are zeros.
 406  *
 407  * CCK rates are only valid in legacy table and will only be used in G
 408  * (2.4 GHz) band.
 409  */
 410
 411 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 412         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 413 };
 414
 415 /* Expected TpT tables. 4 indexes:
 416  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 417  */
 418 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 419         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 420         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 421         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 422         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 423 };
 424
 425 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 426         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 427         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 428         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 429         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 430 };
 431
 432 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 433         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 434         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 435         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 436         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 437 };
 438
 439 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 440         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 441         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 442         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 443         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 444 };
 445
 446 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 447         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 448         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 449         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 450         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 451 };
 452
 453 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 454         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 455         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 456         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 457         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 458 };
 459
 460 /* mbps, mcs */
 461 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 462         {  "1", "BPSK DSSS"},
 463         {  "2", "QPSK DSSS"},
 464         {"5.5", "BPSK CCK"},
 465         { "11", "QPSK CCK"},
 466         {  "6", "BPSK 1/2"},
 467         {  "9", "BPSK 1/2"},
 468         { "12", "QPSK 1/2"},
 469         { "18", "QPSK 3/4"},
 470         { "24", "16QAM 1/2"},
 471         { "36", "16QAM 3/4"},
 472         { "48", "64QAM 2/3"},
 473         { "54", "64QAM 3/4"},
 474         { "60", "64QAM 5/6"},
 475 };
 476
 477 #define MCS_INDEX_PER_STREAM    (8)
 478
 479 static const char *rs_pretty_ant(u8 ant)
 480 {
 481         static const char * const ant_name[] = {
 482                 [ANT_NONE] = "None",
 483                 [ANT_A]    = "A",
 484                 [ANT_B]    = "B",
 485                 [ANT_AB]   = "AB",
 486                 [ANT_C]    = "C",
 487                 [ANT_AC]   = "AC",
 488                 [ANT_BC]   = "BC",
 489                 [ANT_ABC]  = "ABC",
 490         };
 491
 492         if (ant > ANT_ABC)
 493                 return "UNKNOWN";
 494
 495         return ant_name[ant];
 496 }
 497
 498 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 499 {
 500         static const char * const lq_types[] = {
 501                 [LQ_NONE] = "NONE",
 502                 [LQ_LEGACY_A] = "LEGACY_A",
 503                 [LQ_LEGACY_G] = "LEGACY_G",
 504                 [LQ_HT_SISO] = "HT SISO",
 505                 [LQ_HT_MIMO2] = "HT MIMO",
 506                 [LQ_VHT_SISO] = "VHT SISO",
 507                 [LQ_VHT_MIMO2] = "VHT MIMO",
 508         };
 509
 510         if (type < LQ_NONE || type >= LQ_MAX)
 511                 return "UNKNOWN";
 512
 513         return lq_types[type];
 514 }
 515
 516 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 517                                 const char *prefix)
 518 {
 519         IWL_DEBUG_RATE(mvm,
 520                        "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
 521                        prefix, rs_pretty_lq_type(rate->type),
 522                        rate->index, rs_pretty_ant(rate->ant),
 523                        rate->bw, rate->sgi, rate->ldpc, rate->stbc);
 524 }
 525
 526 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 527 {
 528         window->data = 0;
 529         window->success_counter = 0;
 530         window->success_ratio = IWL_INVALID_VALUE;
 531         window->counter = 0;
 532         window->average_tpt = IWL_INVALID_VALUE;
 533 }
 534
 535 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 536                                             struct iwl_scale_tbl_info *tbl)
 537 {
 538         int i;
 539
 540         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 541         for (i = 0; i < IWL_RATE_COUNT; i++)
 542                 rs_rate_scale_clear_window(&tbl->win[i]);
 543
 544         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 545                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 546 }
 547
 548 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 549 {
 550         return (ant_type & valid_antenna) == ant_type;
 551 }
 552
 553 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 554                                       struct iwl_lq_sta *lq_data, u8 tid,
 555                                       struct ieee80211_sta *sta)
 556 {
 557         int ret = -EAGAIN;
 558
 559         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 560                      sta->addr, tid);
 561         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 562         if (ret == -EAGAIN) {
 563                 /*
 564                  * driver and mac80211 is out of sync
 565                  * this might be cause by reloading firmware
 566                  * stop the tx ba session here
 567                  */
 568                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 569                         tid);
 570                 ieee80211_stop_tx_ba_session(sta, tid);
 571         }
 572         return ret;
 573 }
 574
 575 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 576                               struct iwl_lq_sta *lq_data,
 577                               struct ieee80211_sta *sta)
 578 {
 579         if (tid < IWL_MAX_TID_COUNT)
 580                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 581         else
 582                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 583                         tid, IWL_MAX_TID_COUNT);
 584 }
 585
 586 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 587 {
 588         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 589                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 590                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 591 }
 592
 593 /*
 594  * Static function to get the expected throughput from an iwl_scale_tbl_info
 595  * that wraps a NULL pointer check
 596  */
 597 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 598 {
 599         if (tbl->expected_tpt)
 600                 return tbl->expected_tpt[rs_index];
 601         return 0;
 602 }
 603
 604 /**
 605  * rs_collect_tx_data - Update the success/failure sliding window
 606  *
 607  * We keep a sliding window of the last 62 packets transmitted
 608  * at this rate.  window->data contains the bitmask of successful
 609  * packets.
 610  */
 611 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
 612                                struct iwl_scale_tbl_info *tbl,
 613                                int scale_index, int attempts, int successes,
 614                                struct iwl_rate_scale_data *window)
 615 {
 616         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 617         s32 fail_count, tpt;
 618
 619         /* Get expected throughput */
 620         tpt = get_expected_tpt(tbl, scale_index);
 621
 622         /*
 623          * Keep track of only the latest 62 tx frame attempts in this rate's
 624          * history window; anything older isn't really relevant any more.
 625          * If we have filled up the sliding window, drop the oldest attempt;
 626          * if the oldest attempt (highest bit in bitmap) shows "success",
 627          * subtract "1" from the success counter (this is the main reason
 628          * we keep these bitmaps!).
 629          */
 630         while (attempts > 0) {
 631                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 632                         /* remove earliest */
 633                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 634
 635                         if (window->data & mask) {
 636                                 window->data &= ~mask;
 637                                 window->success_counter--;
 638                         }
 639                 }
 640
 641                 /* Increment frames-attempted counter */
 642                 window->counter++;
 643
 644                 /* Shift bitmap by one frame to throw away oldest history */
 645                 window->data <<= 1;
 646
 647                 /* Mark the most recent #successes attempts as successful */
 648                 if (successes > 0) {
 649                         window->success_counter++;
 650                         window->data |= 0x1;
 651                         successes--;
 652                 }
 653
 654                 attempts--;
 655         }
 656
 657         /* Calculate current success ratio, avoid divide-by-0! */
 658         if (window->counter > 0)
 659                 window->success_ratio = 128 * (100 * window->success_counter)
 660                                         / window->counter;
 661         else
 662                 window->success_ratio = IWL_INVALID_VALUE;
 663
 664         fail_count = window->counter - window->success_counter;
 665
 666         /* Calculate average throughput, if we have enough history. */
 667         if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
 668             (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
 669                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 670         else
 671                 window->average_tpt = IWL_INVALID_VALUE;
 672
 673         return 0;
 674 }
 675
 676 static int rs_collect_tx_data(struct iwl_mvm *mvm,
 677                               struct iwl_lq_sta *lq_sta,
 678                               struct iwl_scale_tbl_info *tbl,
 679                               int scale_index, int attempts, int successes,
 680                               u8 reduced_txp)
 681 {
 682         struct iwl_rate_scale_data *window = NULL;
 683         int ret;
 684
 685         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 686                 return -EINVAL;
 687
 688         if (tbl->column != RS_COLUMN_INVALID) {
 689                 struct lq_sta_pers *pers = &lq_sta->pers;
 690
 691                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 692                 pers->tx_stats[tbl->column][scale_index].success += successes;
 693         }
 694
 695         /* Select window for current tx bit rate */
 696         window = &(tbl->win[scale_index]);
 697
 698         ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 699                                   window);
 700         if (ret)
 701                 return ret;
 702
 703         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 704                 return -EINVAL;
 705
 706         window = &tbl->tpc_win[reduced_txp];
 707         return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 708                                    window);
 709 }
 710
 711 /* Convert rs_rate object into ucode rate bitmask */
 712 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 713                                   struct rs_rate *rate)
 714 {
 715         u32 ucode_rate = 0;
 716         int index = rate->index;
 717
 718         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 719                          RATE_MCS_ANT_ABC_MSK);
 720
 721         if (is_legacy(rate)) {
 722                 ucode_rate |= iwl_rates[index].plcp;
 723                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 724                         ucode_rate |= RATE_MCS_CCK_MSK;
 725                 return ucode_rate;
 726         }
 727
 728         if (is_ht(rate)) {
 729                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 730                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 731                         index = IWL_LAST_HT_RATE;
 732                 }
 733                 ucode_rate |= RATE_MCS_HT_MSK;
 734
 735                 if (is_ht_siso(rate))
 736                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 737                 else if (is_ht_mimo2(rate))
 738                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 739                 else
 740                         WARN_ON_ONCE(1);
 741         } else if (is_vht(rate)) {
 742                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 743                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 744                         index = IWL_LAST_VHT_RATE;
 745                 }
 746                 ucode_rate |= RATE_MCS_VHT_MSK;
 747                 if (is_vht_siso(rate))
 748                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 749                 else if (is_vht_mimo2(rate))
 750                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 751                 else
 752                         WARN_ON_ONCE(1);
 753
 754         } else {
 755                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 756         }
 757
 758         if (is_siso(rate) && rate->stbc) {
 759                 /* To enable STBC we need to set both a flag and ANT_AB */
 760                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 761                 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
 762         }
 763
 764         ucode_rate |= rate->bw;
 765         if (rate->sgi)
 766                 ucode_rate |= RATE_MCS_SGI_MSK;
 767         if (rate->ldpc)
 768                 ucode_rate |= RATE_MCS_LDPC_MSK;
 769
 770         return ucode_rate;
 771 }
 772
 773 /* Convert a ucode rate into an rs_rate object */
 774 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 775                                    enum ieee80211_band band,
 776                                    struct rs_rate *rate)
 777 {
 778         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 779         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 780         u8 nss;
 781
 782         memset(rate, 0, sizeof(*rate));
 783         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 784
 785         if (rate->index == IWL_RATE_INVALID)
 786                 return -EINVAL;
 787
 788         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 789
 790         /* Legacy */
 791         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 792             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 793                 if (num_of_ant == 1) {
 794                         if (band == IEEE80211_BAND_5GHZ)
 795                                 rate->type = LQ_LEGACY_A;
 796                         else
 797                                 rate->type = LQ_LEGACY_G;
 798                 }
 799
 800                 return 0;
 801         }
 802
 803         /* HT or VHT */
 804         if (ucode_rate & RATE_MCS_SGI_MSK)
 805                 rate->sgi = true;
 806         if (ucode_rate & RATE_MCS_LDPC_MSK)
 807                 rate->ldpc = true;
 808         if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
 809                 rate->stbc = true;
 810
 811         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 812
 813         if (ucode_rate & RATE_MCS_HT_MSK) {
 814                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 815                        RATE_HT_MCS_NSS_POS) + 1;
 816
 817                 if (nss == 1) {
 818                         rate->type = LQ_HT_SISO;
 819                         WARN_ON_ONCE(!rate->stbc && num_of_ant != 1);
 820                 } else if (nss == 2) {
 821                         rate->type = LQ_HT_MIMO2;
 822                         WARN_ON_ONCE(num_of_ant != 2);
 823                 } else {
 824                         WARN_ON_ONCE(1);
 825                 }
 826         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 827                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 828                        RATE_VHT_MCS_NSS_POS) + 1;
 829
 830                 if (nss == 1) {
 831                         rate->type = LQ_VHT_SISO;
 832                         WARN_ON_ONCE(!rate->stbc && num_of_ant != 1);
 833                 } else if (nss == 2) {
 834                         rate->type = LQ_VHT_MIMO2;
 835                         WARN_ON_ONCE(num_of_ant != 2);
 836                 } else {
 837                         WARN_ON_ONCE(1);
 838                 }
 839         }
 840
 841         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
 842         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 843                      !is_vht(rate));
 844
 845         return 0;
 846 }
 847
 848 /* switch to another antenna/antennas and return 1 */
 849 /* if no other valid antenna found, return 0 */
 850 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 851 {
 852         u8 new_ant_type;
 853
 854         if (!rate->ant || rate->ant > ANT_ABC)
 855                 return 0;
 856
 857         if (!rs_is_valid_ant(valid_ant, rate->ant))
 858                 return 0;
 859
 860         new_ant_type = ant_toggle_lookup[rate->ant];
 861
 862         while ((new_ant_type != rate->ant) &&
 863                !rs_is_valid_ant(valid_ant, new_ant_type))
 864                 new_ant_type = ant_toggle_lookup[new_ant_type];
 865
 866         if (new_ant_type == rate->ant)
 867                 return 0;
 868
 869         rate->ant = new_ant_type;
 870
 871         return 1;
 872 }
 873
 874 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 875                                   struct rs_rate *rate)
 876 {
 877         if (is_legacy(rate))
 878                 return lq_sta->active_legacy_rate;
 879         else if (is_siso(rate))
 880                 return lq_sta->active_siso_rate;
 881         else if (is_mimo2(rate))
 882                 return lq_sta->active_mimo2_rate;
 883
 884         WARN_ON_ONCE(1);
 885         return 0;
 886 }
 887
 888 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 889                                 int rate_type)
 890 {
 891         u8 high = IWL_RATE_INVALID;
 892         u8 low = IWL_RATE_INVALID;
 893
 894         /* 802.11A or ht walks to the next literal adjacent rate in
 895          * the rate table */
 896         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 897                 int i;
 898                 u32 mask;
 899
 900                 /* Find the previous rate that is in the rate mask */
 901                 i = index - 1;
 902                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 903                         if (rate_mask & mask) {
 904                                 low = i;
 905                                 break;
 906                         }
 907                 }
 908
 909                 /* Find the next rate that is in the rate mask */
 910                 i = index + 1;
 911                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 912                         if (rate_mask & mask) {
 913                                 high = i;
 914                                 break;
 915                         }
 916                 }
 917
 918                 return (high << 8) | low;
 919         }
 920
 921         low = index;
 922         while (low != IWL_RATE_INVALID) {
 923                 low = iwl_rates[low].prev_rs;
 924                 if (low == IWL_RATE_INVALID)
 925                         break;
 926                 if (rate_mask & (1 << low))
 927                         break;
 928         }
 929
 930         high = index;
 931         while (high != IWL_RATE_INVALID) {
 932                 high = iwl_rates[high].next_rs;
 933                 if (high == IWL_RATE_INVALID)
 934                         break;
 935                 if (rate_mask & (1 << high))
 936                         break;
 937         }
 938
 939         return (high << 8) | low;
 940 }
 941
 942 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
 943                                      struct rs_rate *rate)
 944 {
 945         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
 946 }
 947
 948 /* Get the next supported lower rate in the current column.
 949  * Return true if bottom rate in the current column was reached
 950  */
 951 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
 952                                         struct rs_rate *rate)
 953 {
 954         u8 low;
 955         u16 high_low;
 956         u16 rate_mask;
 957         struct iwl_mvm *mvm = lq_sta->pers.drv;
 958
 959         rate_mask = rs_get_supported_rates(lq_sta, rate);
 960         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
 961                                         rate->type);
 962         low = high_low & 0xff;
 963
 964         /* Bottom rate of column reached */
 965         if (low == IWL_RATE_INVALID)
 966                 return true;
 967
 968         rate->index = low;
 969         return false;
 970 }
 971
 972 /* Get the next rate to use following a column downgrade */
 973 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
 974                                           struct rs_rate *rate)
 975 {
 976         struct iwl_mvm *mvm = lq_sta->pers.drv;
 977
 978         if (is_legacy(rate)) {
 979                 /* No column to downgrade from Legacy */
 980                 return;
 981         } else if (is_siso(rate)) {
 982                 /* Downgrade to Legacy if we were in SISO */
 983                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 984                         rate->type = LQ_LEGACY_A;
 985                 else
 986                         rate->type = LQ_LEGACY_G;
 987
 988                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
 989
 990                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
 991                              rate->index > IWL_RATE_MCS_9_INDEX);
 992
 993                 rate->index = rs_ht_to_legacy[rate->index];
 994                 rate->ldpc = false;
 995         } else {
 996                 /* Downgrade to SISO with same MCS if in MIMO  */
 997                 rate->type = is_vht_mimo2(rate) ?
 998                         LQ_VHT_SISO : LQ_HT_SISO;
 999         }
1000
1001         if (num_of_ant(rate->ant) > 1)
1002                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1003
1004         /* Relevant in both switching to SISO or Legacy */
1005         rate->sgi = false;
1006
1007         if (!rs_rate_supported(lq_sta, rate))
1008                 rs_get_lower_rate_in_column(lq_sta, rate);
1009 }
1010
1011 /* Simple function to compare two rate scale table types */
1012 static inline bool rs_rate_match(struct rs_rate *a,
1013                                  struct rs_rate *b)
1014 {
1015         bool ant_match;
1016
1017         if (a->stbc)
1018                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1019         else
1020                 ant_match = (a->ant == b->ant);
1021
1022         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1023                 && ant_match;
1024 }
1025
1026 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
1027 {
1028         if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
1029                 return RATE_MCS_CHAN_WIDTH_40;
1030         else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
1031                 return RATE_MCS_CHAN_WIDTH_80;
1032         else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
1033                 return RATE_MCS_CHAN_WIDTH_160;
1034
1035         return RATE_MCS_CHAN_WIDTH_20;
1036 }
1037
1038 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1039 {
1040         u8 tid = IWL_MAX_TID_COUNT;
1041
1042         if (ieee80211_is_data_qos(hdr->frame_control)) {
1043                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1044                 tid = qc[0] & 0xf;
1045         }
1046
1047         if (unlikely(tid > IWL_MAX_TID_COUNT))
1048                 tid = IWL_MAX_TID_COUNT;
1049
1050         return tid;
1051 }
1052
1053 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1054                           int tid, struct ieee80211_tx_info *info)
1055 {
1056         int legacy_success;
1057         int retries;
1058         int mac_index, i;
1059         struct iwl_lq_cmd *table;
1060         enum mac80211_rate_control_flags mac_flags;
1061         u32 ucode_rate;
1062         struct rs_rate rate;
1063         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1064         u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1065         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1066         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1067
1068         /* Treat uninitialized rate scaling data same as non-existing. */
1069         if (!lq_sta) {
1070                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1071                 return;
1072         } else if (!lq_sta->pers.drv) {
1073                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1074                 return;
1075         }
1076
1077 #ifdef CONFIG_MAC80211_DEBUGFS
1078         /* Disable last tx check if we are debugging with fixed rate */
1079         if (lq_sta->pers.dbg_fixed_rate) {
1080                 IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n");
1081                 return;
1082         }
1083 #endif
1084         /* This packet was aggregated but doesn't carry status info */
1085         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1086             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1087                 return;
1088
1089         /*
1090          * Ignore this Tx frame response if its initial rate doesn't match
1091          * that of latest Link Quality command.  There may be stragglers
1092          * from a previous Link Quality command, but we're no longer interested
1093          * in those; they're either from the "active" mode while we're trying
1094          * to check "search" mode, or a prior "search" mode after we've moved
1095          * to a new "search" mode (which might become the new "active" mode).
1096          */
1097         table = &lq_sta->lq;
1098         ucode_rate = le32_to_cpu(table->rs_table[0]);
1099         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1100         if (info->band == IEEE80211_BAND_5GHZ)
1101                 rate.index -= IWL_FIRST_OFDM_RATE;
1102         mac_flags = info->status.rates[0].flags;
1103         mac_index = info->status.rates[0].idx;
1104         /* For HT packets, map MCS to PLCP */
1105         if (mac_flags & IEEE80211_TX_RC_MCS) {
1106                 /* Remove # of streams */
1107                 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1108                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1109                         mac_index++;
1110                 /*
1111                  * mac80211 HT index is always zero-indexed; we need to move
1112                  * HT OFDM rates after CCK rates in 2.4 GHz band
1113                  */
1114                 if (info->band == IEEE80211_BAND_2GHZ)
1115                         mac_index += IWL_FIRST_OFDM_RATE;
1116         } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1117                 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1118                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1119                         mac_index++;
1120         }
1121
1122         if (time_after(jiffies,
1123                        (unsigned long)(lq_sta->last_tx +
1124                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1125                 int t;
1126
1127                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1128                 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1129                         ieee80211_stop_tx_ba_session(sta, t);
1130
1131                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1132                 return;
1133         }
1134         lq_sta->last_tx = jiffies;
1135
1136         /* Here we actually compare this rate to the latest LQ command */
1137         if ((mac_index < 0) ||
1138             (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1139             (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1140             (rate.ant != info->status.antenna) ||
1141             (!!(ucode_rate & RATE_MCS_HT_MSK) !=
1142              !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
1143             (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
1144              !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
1145             (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
1146              !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
1147             (rate.index != mac_index)) {
1148                 IWL_DEBUG_RATE(mvm,
1149                                "initial rate %d does not match %d (0x%x)\n",
1150                                mac_index, rate.index, ucode_rate);
1151                 /*
1152                  * Since rates mis-match, the last LQ command may have failed.
1153                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1154                  * ... driver.
1155                  */
1156                 lq_sta->missed_rate_counter++;
1157                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1158                         lq_sta->missed_rate_counter = 0;
1159                         IWL_DEBUG_RATE(mvm,
1160                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1161                                        lq_sta->rs_state);
1162                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1163                 }
1164                 /* Regardless, ignore this status info for outdated rate */
1165                 return;
1166         } else
1167                 /* Rate did match, so reset the missed_rate_counter */
1168                 lq_sta->missed_rate_counter = 0;
1169
1170         if (!lq_sta->search_better_tbl) {
1171                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1172                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1173         } else {
1174                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1175                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1176         }
1177
1178         if (WARN_ON_ONCE(!rs_rate_match(&rate, &curr_tbl->rate))) {
1179                 IWL_DEBUG_RATE(mvm,
1180                                "Neither active nor search matches tx rate\n");
1181                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1182                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1183                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1184                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1185                 rs_dump_rate(mvm, &rate, "ACTUAL");
1186
1187                 /*
1188                  * no matching table found, let's by-pass the data collection
1189                  * and continue to perform rate scale to find the rate table
1190                  */
1191                 rs_stay_in_table(lq_sta, true);
1192                 goto done;
1193         }
1194
1195         /*
1196          * Updating the frame history depends on whether packets were
1197          * aggregated.
1198          *
1199          * For aggregation, all packets were transmitted at the same rate, the
1200          * first index into rate scale table.
1201          */
1202         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1203                 /* ampdu_ack_len = 0 marks no BA was received. In this case
1204                  * treat it as a single frame loss as we don't want the success
1205                  * ratio to dip too quickly because a BA wasn't received
1206                  */
1207                 if (info->status.ampdu_ack_len == 0)
1208                         info->status.ampdu_len = 1;
1209
1210                 ucode_rate = le32_to_cpu(table->rs_table[0]);
1211                 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1212                 rs_collect_tx_data(mvm, lq_sta, curr_tbl, rate.index,
1213                                    info->status.ampdu_len,
1214                                    info->status.ampdu_ack_len,
1215                                    reduced_txp);
1216
1217                 /* Update success/fail counts if not searching for new mode */
1218                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1219                         lq_sta->total_success += info->status.ampdu_ack_len;
1220                         lq_sta->total_failed += (info->status.ampdu_len -
1221                                         info->status.ampdu_ack_len);
1222                 }
1223         } else {
1224         /*
1225          * For legacy, update frame history with for each Tx retry.
1226          */
1227                 retries = info->status.rates[0].count - 1;
1228                 /* HW doesn't send more than 15 retries */
1229                 retries = min(retries, 15);
1230
1231                 /* The last transmission may have been successful */
1232                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1233                 /* Collect data for each rate used during failed TX attempts */
1234                 for (i = 0; i <= retries; ++i) {
1235                         ucode_rate = le32_to_cpu(table->rs_table[i]);
1236                         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1237                         /*
1238                          * Only collect stats if retried rate is in the same RS
1239                          * table as active/search.
1240                          */
1241                         if (rs_rate_match(&rate, &curr_tbl->rate))
1242                                 tmp_tbl = curr_tbl;
1243                         else if (rs_rate_match(&rate, &other_tbl->rate))
1244                                 tmp_tbl = other_tbl;
1245                         else
1246                                 continue;
1247
1248                         rs_collect_tx_data(mvm, lq_sta, tmp_tbl, rate.index, 1,
1249                                            i < retries ? 0 : legacy_success,
1250                                            reduced_txp);
1251                 }
1252
1253                 /* Update success/fail counts if not searching for new mode */
1254                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1255                         lq_sta->total_success += legacy_success;
1256                         lq_sta->total_failed += retries + (1 - legacy_success);
1257                 }
1258         }
1259         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1260         lq_sta->last_rate_n_flags = ucode_rate;
1261         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1262 done:
1263         /* See if there's a better rate or modulation mode to try. */
1264         if (sta->supp_rates[info->band])
1265                 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1266 }
1267
1268 /*
1269  * mac80211 sends us Tx status
1270  */
1271 static void rs_mac80211_tx_status(void *mvm_r,
1272                                   struct ieee80211_supported_band *sband,
1273                                   struct ieee80211_sta *sta, void *priv_sta,
1274                                   struct sk_buff *skb)
1275 {
1276         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1277         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1278         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1279         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1280
1281         if (!ieee80211_is_data(hdr->frame_control) ||
1282             info->flags & IEEE80211_TX_CTL_NO_ACK)
1283                 return;
1284
1285         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1286 }
1287
1288 /*
1289  * Begin a period of staying with a selected modulation mode.
1290  * Set "stay_in_tbl" flag to prevent any mode switches.
1291  * Set frame tx success limits according to legacy vs. high-throughput,
1292  * and reset overall (spanning all rates) tx success history statistics.
1293  * These control how long we stay using same modulation mode before
1294  * searching for a new mode.
1295  */
1296 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1297                                  struct iwl_lq_sta *lq_sta)
1298 {
1299         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1300         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1301         if (is_legacy) {
1302                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1303                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1304                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1305         } else {
1306                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1307                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1308                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1309         }
1310         lq_sta->table_count = 0;
1311         lq_sta->total_failed = 0;
1312         lq_sta->total_success = 0;
1313         lq_sta->flush_timer = jiffies;
1314         lq_sta->visited_columns = 0;
1315 }
1316
1317 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1318 {
1319         if (rate_mask)
1320                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1321         return IWL_RATE_INVALID;
1322 }
1323
1324 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1325                                    const struct rs_tx_column *column)
1326 {
1327         switch (column->mode) {
1328         case RS_LEGACY:
1329                 return lq_sta->max_legacy_rate_idx;
1330         case RS_SISO:
1331                 return lq_sta->max_siso_rate_idx;
1332         case RS_MIMO2:
1333                 return lq_sta->max_mimo2_rate_idx;
1334         default:
1335                 WARN_ON_ONCE(1);
1336         }
1337
1338         return lq_sta->max_legacy_rate_idx;
1339 }
1340
1341 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1342                                             const struct rs_tx_column *column,
1343                                             u32 bw)
1344 {
1345         /* Used to choose among HT tables */
1346         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1347
1348         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1349                          column->mode != RS_SISO &&
1350                          column->mode != RS_MIMO2))
1351                 return expected_tpt_legacy;
1352
1353         /* Legacy rates have only one table */
1354         if (column->mode == RS_LEGACY)
1355                 return expected_tpt_legacy;
1356
1357         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1358         /* Choose among many HT tables depending on number of streams
1359          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1360          * status */
1361         if (column->mode == RS_SISO) {
1362                 switch (bw) {
1363                 case RATE_MCS_CHAN_WIDTH_20:
1364                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1365                         break;
1366                 case RATE_MCS_CHAN_WIDTH_40:
1367                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1368                         break;
1369                 case RATE_MCS_CHAN_WIDTH_80:
1370                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1371                         break;
1372                 default:
1373                         WARN_ON_ONCE(1);
1374                 }
1375         } else if (column->mode == RS_MIMO2) {
1376                 switch (bw) {
1377                 case RATE_MCS_CHAN_WIDTH_20:
1378                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1379                         break;
1380                 case RATE_MCS_CHAN_WIDTH_40:
1381                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1382                         break;
1383                 case RATE_MCS_CHAN_WIDTH_80:
1384                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1385                         break;
1386                 default:
1387                         WARN_ON_ONCE(1);
1388                 }
1389         } else {
1390                 WARN_ON_ONCE(1);
1391         }
1392
1393         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1394                 return ht_tbl_pointer[0];
1395         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1396                 return ht_tbl_pointer[1];
1397         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1398                 return ht_tbl_pointer[2];
1399         else                                            /* AGG+SGI */
1400                 return ht_tbl_pointer[3];
1401 }
1402
1403 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1404                                       struct iwl_scale_tbl_info *tbl)
1405 {
1406         struct rs_rate *rate = &tbl->rate;
1407         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1408
1409         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1410 }
1411
1412 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1413                             struct iwl_lq_sta *lq_sta,
1414                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1415                             unsigned long rate_mask, s8 index)
1416 {
1417         struct iwl_scale_tbl_info *active_tbl =
1418             &(lq_sta->lq_info[lq_sta->active_tbl]);
1419         s32 success_ratio = active_tbl->win[index].success_ratio;
1420         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1421         const u16 *tpt_tbl = tbl->expected_tpt;
1422         u16 high_low;
1423         u32 target_tpt;
1424         int rate_idx;
1425
1426         if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) {
1427                 target_tpt = 100 * expected_current_tpt;
1428                 IWL_DEBUG_RATE(mvm,
1429                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1430                                success_ratio, target_tpt);
1431         } else {
1432                 target_tpt = lq_sta->last_tpt;
1433                 IWL_DEBUG_RATE(mvm,
1434                                "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1435                                success_ratio, target_tpt);
1436         }
1437
1438         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1439
1440         while (rate_idx != IWL_RATE_INVALID) {
1441                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1442                         break;
1443
1444                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1445                                                 tbl->rate.type);
1446
1447                 rate_idx = (high_low >> 8) & 0xff;
1448         }
1449
1450         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1451                        rate_idx, target_tpt,
1452                        rate_idx != IWL_RATE_INVALID ?
1453                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1454
1455         return rate_idx;
1456 }
1457
1458 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1459 {
1460         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1461                 return RATE_MCS_CHAN_WIDTH_80;
1462         else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1463                 return RATE_MCS_CHAN_WIDTH_40;
1464
1465         return RATE_MCS_CHAN_WIDTH_20;
1466 }
1467
1468 /*
1469  * Check whether we should continue using same modulation mode, or
1470  * begin search for a new mode, based on:
1471  * 1) # tx successes or failures while using this mode
1472  * 2) # times calling this function
1473  * 3) elapsed time in this mode (not used, for now)
1474  */
1475 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1476 {
1477         struct iwl_scale_tbl_info *tbl;
1478         int active_tbl;
1479         int flush_interval_passed = 0;
1480         struct iwl_mvm *mvm;
1481
1482         mvm = lq_sta->pers.drv;
1483         active_tbl = lq_sta->active_tbl;
1484
1485         tbl = &(lq_sta->lq_info[active_tbl]);
1486
1487         /* If we've been disallowing search, see if we should now allow it */
1488         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1489                 /* Elapsed time using current modulation mode */
1490                 if (lq_sta->flush_timer)
1491                         flush_interval_passed =
1492                                 time_after(jiffies,
1493                                            (unsigned long)(lq_sta->flush_timer +
1494                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1495
1496                 /*
1497                  * Check if we should allow search for new modulation mode.
1498                  * If many frames have failed or succeeded, or we've used
1499                  * this same modulation for a long time, allow search, and
1500                  * reset history stats that keep track of whether we should
1501                  * allow a new search.  Also (below) reset all bitmaps and
1502                  * stats in active history.
1503                  */
1504                 if (force_search ||
1505                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1506                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1507                     ((!lq_sta->search_better_tbl) &&
1508                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1509                         IWL_DEBUG_RATE(mvm,
1510                                        "LQ: stay is expired %d %d %d\n",
1511                                      lq_sta->total_failed,
1512                                      lq_sta->total_success,
1513                                      flush_interval_passed);
1514
1515                         /* Allow search for new mode */
1516                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1517                         IWL_DEBUG_RATE(mvm,
1518                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1519                         lq_sta->total_failed = 0;
1520                         lq_sta->total_success = 0;
1521                         lq_sta->flush_timer = 0;
1522                         /* mark the current column as visited */
1523                         lq_sta->visited_columns = BIT(tbl->column);
1524                 /*
1525                  * Else if we've used this modulation mode enough repetitions
1526                  * (regardless of elapsed time or success/failure), reset
1527                  * history bitmaps and rate-specific stats for all rates in
1528                  * active table.
1529                  */
1530                 } else {
1531                         lq_sta->table_count++;
1532                         if (lq_sta->table_count >=
1533                             lq_sta->table_count_limit) {
1534                                 lq_sta->table_count = 0;
1535
1536                                 IWL_DEBUG_RATE(mvm,
1537                                                "LQ: stay in table clear win\n");
1538                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1539                         }
1540                 }
1541
1542                 /* If transitioning to allow "search", reset all history
1543                  * bitmaps and stats in active table (this will become the new
1544                  * "search" table). */
1545                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1546                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1547                 }
1548         }
1549 }
1550
1551 /*
1552  * setup rate table in uCode
1553  */
1554 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1555                                struct ieee80211_sta *sta,
1556                                struct iwl_lq_sta *lq_sta,
1557                                struct rs_rate *rate)
1558 {
1559         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
1560         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1561 }
1562
1563 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1564                                          struct iwl_lq_sta *lq_sta,
1565                                          struct ieee80211_sta *sta,
1566                                          struct iwl_scale_tbl_info *tbl)
1567 {
1568         int i, j, max_rate;
1569         enum rs_column next_col_id;
1570         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1571         const struct rs_tx_column *next_col;
1572         allow_column_func_t allow_func;
1573         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1574         const u16 *expected_tpt_tbl;
1575         u16 tpt, max_expected_tpt;
1576
1577         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1578                 next_col_id = curr_col->next_columns[i];
1579
1580                 if (next_col_id == RS_COLUMN_INVALID)
1581                         continue;
1582
1583                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1584                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1585                                        next_col_id);
1586                         continue;
1587                 }
1588
1589                 next_col = &rs_tx_columns[next_col_id];
1590
1591                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1592                         IWL_DEBUG_RATE(mvm,
1593                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1594                                        next_col_id, valid_ants, next_col->ant);
1595                         continue;
1596                 }
1597
1598                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1599                         allow_func = next_col->checks[j];
1600                         if (allow_func && !allow_func(mvm, sta, tbl, next_col))
1601                                 break;
1602                 }
1603
1604                 if (j != MAX_COLUMN_CHECKS) {
1605                         IWL_DEBUG_RATE(mvm,
1606                                        "Skip column %d: not allowed (check %d failed)\n",
1607                                        next_col_id, j);
1608
1609                         continue;
1610                 }
1611
1612                 tpt = lq_sta->last_tpt / 100;
1613                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1614                                                      rs_bw_from_sta_bw(sta));
1615                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1616                         continue;
1617
1618                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1619                 if (max_rate == IWL_RATE_INVALID) {
1620                         IWL_DEBUG_RATE(mvm,
1621                                        "Skip column %d: no rate is allowed in this column\n",
1622                                        next_col_id);
1623                         continue;
1624                 }
1625
1626                 max_expected_tpt = expected_tpt_tbl[max_rate];
1627                 if (tpt >= max_expected_tpt) {
1628                         IWL_DEBUG_RATE(mvm,
1629                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1630                                        next_col_id, max_expected_tpt, tpt);
1631                         continue;
1632                 }
1633
1634                 IWL_DEBUG_RATE(mvm,
1635                                "Found potential column %d. Max expected %d current %d\n",
1636                                next_col_id, max_expected_tpt, tpt);
1637                 break;
1638         }
1639
1640         if (i == MAX_NEXT_COLUMNS)
1641                 return RS_COLUMN_INVALID;
1642
1643         return next_col_id;
1644 }
1645
1646 static int rs_switch_to_column(struct iwl_mvm *mvm,
1647                                struct iwl_lq_sta *lq_sta,
1648                                struct ieee80211_sta *sta,
1649                                enum rs_column col_id)
1650 {
1651         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1652         struct iwl_scale_tbl_info *search_tbl =
1653                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1654         struct rs_rate *rate = &search_tbl->rate;
1655         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1656         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1657         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1658                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1659         unsigned long rate_mask = 0;
1660         u32 rate_idx = 0;
1661
1662         memcpy(search_tbl, tbl, sz);
1663
1664         rate->sgi = column->sgi;
1665         rate->ant = column->ant;
1666
1667         if (column->mode == RS_LEGACY) {
1668                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1669                         rate->type = LQ_LEGACY_A;
1670                 else
1671                         rate->type = LQ_LEGACY_G;
1672
1673                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1674                 rate->ldpc = false;
1675                 rate_mask = lq_sta->active_legacy_rate;
1676         } else if (column->mode == RS_SISO) {
1677                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1678                 rate_mask = lq_sta->active_siso_rate;
1679         } else if (column->mode == RS_MIMO2) {
1680                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1681                 rate_mask = lq_sta->active_mimo2_rate;
1682         } else {
1683                 WARN_ON_ONCE("Bad column mode");
1684         }
1685
1686         if (column->mode != RS_LEGACY) {
1687                 rate->bw = rs_bw_from_sta_bw(sta);
1688                 rate->ldpc = lq_sta->ldpc;
1689         }
1690
1691         search_tbl->column = col_id;
1692         rs_set_expected_tpt_table(lq_sta, search_tbl);
1693
1694         lq_sta->visited_columns |= BIT(col_id);
1695
1696         /* Get the best matching rate if we're changing modes. e.g.
1697          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1698          */
1699         if (curr_column->mode != column->mode) {
1700                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1701                                             rate_mask, rate->index);
1702
1703                 if ((rate_idx == IWL_RATE_INVALID) ||
1704                     !(BIT(rate_idx) & rate_mask)) {
1705                         IWL_DEBUG_RATE(mvm,
1706                                        "can not switch with index %d"
1707                                        " rate mask %lx\n",
1708                                        rate_idx, rate_mask);
1709
1710                         goto err;
1711                 }
1712
1713                 rate->index = rate_idx;
1714         }
1715
1716         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1717                        col_id, rate->index);
1718
1719         return 0;
1720
1721 err:
1722         rate->type = LQ_NONE;
1723         return -1;
1724 }
1725
1726 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1727                                          struct iwl_scale_tbl_info *tbl,
1728                                          s32 sr, int low, int high,
1729                                          int current_tpt,
1730                                          int low_tpt, int high_tpt)
1731 {
1732         enum rs_action action = RS_ACTION_STAY;
1733
1734         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1735             (current_tpt == 0)) {
1736                 IWL_DEBUG_RATE(mvm,
1737                                "Decrease rate because of low SR\n");
1738                 return RS_ACTION_DOWNSCALE;
1739         }
1740
1741         if ((low_tpt == IWL_INVALID_VALUE) &&
1742             (high_tpt == IWL_INVALID_VALUE) &&
1743             (high != IWL_RATE_INVALID)) {
1744                 IWL_DEBUG_RATE(mvm,
1745                                "No data about high/low rates. Increase rate\n");
1746                 return RS_ACTION_UPSCALE;
1747         }
1748
1749         if ((high_tpt == IWL_INVALID_VALUE) &&
1750             (high != IWL_RATE_INVALID) &&
1751             (low_tpt != IWL_INVALID_VALUE) &&
1752             (low_tpt < current_tpt)) {
1753                 IWL_DEBUG_RATE(mvm,
1754                                "No data about high rate and low rate is worse. Increase rate\n");
1755                 return RS_ACTION_UPSCALE;
1756         }
1757
1758         if ((high_tpt != IWL_INVALID_VALUE) &&
1759             (high_tpt > current_tpt)) {
1760                 IWL_DEBUG_RATE(mvm,
1761                                "Higher rate is better. Increate rate\n");
1762                 return RS_ACTION_UPSCALE;
1763         }
1764
1765         if ((low_tpt != IWL_INVALID_VALUE) &&
1766             (high_tpt != IWL_INVALID_VALUE) &&
1767             (low_tpt < current_tpt) &&
1768             (high_tpt < current_tpt)) {
1769                 IWL_DEBUG_RATE(mvm,
1770                                "Both high and low are worse. Maintain rate\n");
1771                 return RS_ACTION_STAY;
1772         }
1773
1774         if ((low_tpt != IWL_INVALID_VALUE) &&
1775             (low_tpt > current_tpt)) {
1776                 IWL_DEBUG_RATE(mvm,
1777                                "Lower rate is better\n");
1778                 action = RS_ACTION_DOWNSCALE;
1779                 goto out;
1780         }
1781
1782         if ((low_tpt == IWL_INVALID_VALUE) &&
1783             (low != IWL_RATE_INVALID)) {
1784                 IWL_DEBUG_RATE(mvm,
1785                                "No data about lower rate\n");
1786                 action = RS_ACTION_DOWNSCALE;
1787                 goto out;
1788         }
1789
1790         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1791
1792 out:
1793         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1794                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1795                         IWL_DEBUG_RATE(mvm,
1796                                        "SR is above NO DECREASE. Avoid downscale\n");
1797                         action = RS_ACTION_STAY;
1798                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1799                         IWL_DEBUG_RATE(mvm,
1800                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1801                         action = RS_ACTION_STAY;
1802                 } else {
1803                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1804                 }
1805         }
1806
1807         return action;
1808 }
1809
1810 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1811                           struct iwl_lq_sta *lq_sta)
1812 {
1813         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1814          * supports STBC of at least 1*SS
1815          */
1816         if (!lq_sta->stbc_capable)
1817                 return false;
1818
1819         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1820                 return false;
1821
1822         return true;
1823 }
1824
1825 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1826                                 int *weaker, int *stronger)
1827 {
1828         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1829         if (*weaker > TPC_MAX_REDUCTION)
1830                 *weaker = TPC_INVALID;
1831
1832         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1833         if (*stronger < 0)
1834                 *stronger = TPC_INVALID;
1835 }
1836
1837 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1838                            struct rs_rate *rate, enum ieee80211_band band)
1839 {
1840         int index = rate->index;
1841         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1842         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1843                                 !vif->bss_conf.ps);
1844
1845         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1846                        cam, sta_ps_disabled);
1847         /*
1848          * allow tpc only if power management is enabled, or bt coex
1849          * activity grade allows it and we are on 2.4Ghz.
1850          */
1851         if ((cam || sta_ps_disabled) &&
1852             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1853                 return false;
1854
1855         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1856         if (is_legacy(rate))
1857                 return index == IWL_RATE_54M_INDEX;
1858         if (is_ht(rate))
1859                 return index == IWL_RATE_MCS_7_INDEX;
1860         if (is_vht(rate))
1861                 return index == IWL_RATE_MCS_7_INDEX ||
1862                        index == IWL_RATE_MCS_8_INDEX ||
1863                        index == IWL_RATE_MCS_9_INDEX;
1864
1865         WARN_ON_ONCE(1);
1866         return false;
1867 }
1868
1869 enum tpc_action {
1870         TPC_ACTION_STAY,
1871         TPC_ACTION_DECREASE,
1872         TPC_ACTION_INCREASE,
1873         TPC_ACTION_NO_RESTIRCTION,
1874 };
1875
1876 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1877                                          s32 sr, int weak, int strong,
1878                                          int current_tpt,
1879                                          int weak_tpt, int strong_tpt)
1880 {
1881         /* stay until we have valid tpt */
1882         if (current_tpt == IWL_INVALID_VALUE) {
1883                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1884                 return TPC_ACTION_STAY;
1885         }
1886
1887         /* Too many failures, increase txp */
1888         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1889             current_tpt == 0) {
1890                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1891                 return TPC_ACTION_NO_RESTIRCTION;
1892         }
1893
1894         /* try decreasing first if applicable */
1895         if (weak != TPC_INVALID) {
1896                 if (weak_tpt == IWL_INVALID_VALUE &&
1897                     (strong_tpt == IWL_INVALID_VALUE ||
1898                      current_tpt >= strong_tpt)) {
1899                         IWL_DEBUG_RATE(mvm,
1900                                        "no weak txp measurement. decrease txp\n");
1901                         return TPC_ACTION_DECREASE;
1902                 }
1903
1904                 if (weak_tpt > current_tpt) {
1905                         IWL_DEBUG_RATE(mvm,
1906                                        "lower txp has better tpt. decrease txp\n");
1907                         return TPC_ACTION_DECREASE;
1908                 }
1909         }
1910
1911         /* next, increase if needed */
1912         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1913             strong != TPC_INVALID) {
1914                 if (weak_tpt == IWL_INVALID_VALUE &&
1915                     strong_tpt != IWL_INVALID_VALUE &&
1916                     current_tpt < strong_tpt) {
1917                         IWL_DEBUG_RATE(mvm,
1918                                        "higher txp has better tpt. increase txp\n");
1919                         return TPC_ACTION_INCREASE;
1920                 }
1921
1922                 if (weak_tpt < current_tpt &&
1923                     (strong_tpt == IWL_INVALID_VALUE ||
1924                      strong_tpt > current_tpt)) {
1925                         IWL_DEBUG_RATE(mvm,
1926                                        "lower txp has worse tpt. increase txp\n");
1927                         return TPC_ACTION_INCREASE;
1928                 }
1929         }
1930
1931         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1932         return TPC_ACTION_STAY;
1933 }
1934
1935 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1936                            struct ieee80211_sta *sta,
1937                            struct iwl_lq_sta *lq_sta,
1938                            struct iwl_scale_tbl_info *tbl)
1939 {
1940         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1941         struct ieee80211_vif *vif = mvm_sta->vif;
1942         struct ieee80211_chanctx_conf *chanctx_conf;
1943         enum ieee80211_band band;
1944         struct iwl_rate_scale_data *window;
1945         struct rs_rate *rate = &tbl->rate;
1946         enum tpc_action action;
1947         s32 sr;
1948         u8 cur = lq_sta->lq.reduced_tpc;
1949         int current_tpt;
1950         int weak, strong;
1951         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1952
1953 #ifdef CONFIG_MAC80211_DEBUGFS
1954         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1955                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1956                                lq_sta->pers.dbg_fixed_txp_reduction);
1957                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1958                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1959         }
1960 #endif
1961
1962         rcu_read_lock();
1963         chanctx_conf = rcu_dereference(vif->chanctx_conf);
1964         if (WARN_ON(!chanctx_conf))
1965                 band = IEEE80211_NUM_BANDS;
1966         else
1967                 band = chanctx_conf->def.chan->band;
1968         rcu_read_unlock();
1969
1970         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1971                 IWL_DEBUG_RATE(mvm,
1972                                "tpc is not allowed. remove txp restrictions\n");
1973                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1974                 return cur != TPC_NO_REDUCTION;
1975         }
1976
1977         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1978
1979         /* Collect measured throughputs for current and adjacent rates */
1980         window = tbl->tpc_win;
1981         sr = window[cur].success_ratio;
1982         current_tpt = window[cur].average_tpt;
1983         if (weak != TPC_INVALID)
1984                 weak_tpt = window[weak].average_tpt;
1985         if (strong != TPC_INVALID)
1986                 strong_tpt = window[strong].average_tpt;
1987
1988         IWL_DEBUG_RATE(mvm,
1989                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1990                        cur, current_tpt, sr, weak, strong,
1991                        weak_tpt, strong_tpt);
1992
1993         action = rs_get_tpc_action(mvm, sr, weak, strong,
1994                                    current_tpt, weak_tpt, strong_tpt);
1995
1996         /* override actions if we are on the edge */
1997         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
1998                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
1999                 action = TPC_ACTION_STAY;
2000         } else if (strong == TPC_INVALID &&
2001                    (action == TPC_ACTION_INCREASE ||
2002                     action == TPC_ACTION_NO_RESTIRCTION)) {
2003                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2004                 action = TPC_ACTION_STAY;
2005         }
2006
2007         switch (action) {
2008         case TPC_ACTION_DECREASE:
2009                 lq_sta->lq.reduced_tpc = weak;
2010                 return true;
2011         case TPC_ACTION_INCREASE:
2012                 lq_sta->lq.reduced_tpc = strong;
2013                 return true;
2014         case TPC_ACTION_NO_RESTIRCTION:
2015                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2016                 return true;
2017         case TPC_ACTION_STAY:
2018                 /* do nothing */
2019                 break;
2020         }
2021         return false;
2022 }
2023
2024 /*
2025  * Do rate scaling and search for new modulation mode.
2026  */
2027 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2028                                   struct ieee80211_sta *sta,
2029                                   struct iwl_lq_sta *lq_sta,
2030                                   int tid)
2031 {
2032         int low = IWL_RATE_INVALID;
2033         int high = IWL_RATE_INVALID;
2034         int index;
2035         struct iwl_rate_scale_data *window = NULL;
2036         int current_tpt = IWL_INVALID_VALUE;
2037         int low_tpt = IWL_INVALID_VALUE;
2038         int high_tpt = IWL_INVALID_VALUE;
2039         u32 fail_count;
2040         enum rs_action scale_action = RS_ACTION_STAY;
2041         u16 rate_mask;
2042         u8 update_lq = 0;
2043         struct iwl_scale_tbl_info *tbl, *tbl1;
2044         u8 active_tbl = 0;
2045         u8 done_search = 0;
2046         u16 high_low;
2047         s32 sr;
2048         u8 prev_agg = lq_sta->is_agg;
2049         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2050         struct iwl_mvm_tid_data *tid_data;
2051         struct rs_rate *rate;
2052
2053         lq_sta->is_agg = !!sta_priv->agg_tids;
2054
2055         /*
2056          * Select rate-scale / modulation-mode table to work with in
2057          * the rest of this function:  "search" if searching for better
2058          * modulation mode, or "active" if doing rate scaling within a mode.
2059          */
2060         if (!lq_sta->search_better_tbl)
2061                 active_tbl = lq_sta->active_tbl;
2062         else
2063                 active_tbl = 1 - lq_sta->active_tbl;
2064
2065         tbl = &(lq_sta->lq_info[active_tbl]);
2066         rate = &tbl->rate;
2067
2068         if (prev_agg != lq_sta->is_agg) {
2069                 IWL_DEBUG_RATE(mvm,
2070                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2071                                prev_agg, lq_sta->is_agg);
2072                 rs_set_expected_tpt_table(lq_sta, tbl);
2073                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2074         }
2075
2076         /* current tx rate */
2077         index = lq_sta->last_txrate_idx;
2078
2079         /* rates available for this association, and for modulation mode */
2080         rate_mask = rs_get_supported_rates(lq_sta, rate);
2081
2082         if (!(BIT(index) & rate_mask)) {
2083                 IWL_ERR(mvm, "Current Rate is not valid\n");
2084                 if (lq_sta->search_better_tbl) {
2085                         /* revert to active table if search table is not valid*/
2086                         rate->type = LQ_NONE;
2087                         lq_sta->search_better_tbl = 0;
2088                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2089                         rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2090                 }
2091                 return;
2092         }
2093
2094         /* Get expected throughput table and history window for current rate */
2095         if (!tbl->expected_tpt) {
2096                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2097                 return;
2098         }
2099
2100         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2101         window = &(tbl->win[index]);
2102
2103         /*
2104          * If there is not enough history to calculate actual average
2105          * throughput, keep analyzing results of more tx frames, without
2106          * changing rate or mode (bypass most of the rest of this function).
2107          * Set up new rate table in uCode only if old rate is not supported
2108          * in current association (use new rate found above).
2109          */
2110         fail_count = window->counter - window->success_counter;
2111         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2112             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2113                 IWL_DEBUG_RATE(mvm,
2114                                "(%s: %d): Test Window: succ %d total %d\n",
2115                                rs_pretty_lq_type(rate->type),
2116                                index, window->success_counter, window->counter);
2117
2118                 /* Can't calculate this yet; not enough history */
2119                 window->average_tpt = IWL_INVALID_VALUE;
2120
2121                 /* Should we stay with this modulation mode,
2122                  * or search for a new one? */
2123                 rs_stay_in_table(lq_sta, false);
2124
2125                 goto out;
2126         }
2127         /* Else we have enough samples; calculate estimate of
2128          * actual average throughput */
2129         if (window->average_tpt != ((window->success_ratio *
2130                         tbl->expected_tpt[index] + 64) / 128)) {
2131                 window->average_tpt = ((window->success_ratio *
2132                                         tbl->expected_tpt[index] + 64) / 128);
2133         }
2134
2135         /* If we are searching for better modulation mode, check success. */
2136         if (lq_sta->search_better_tbl) {
2137                 /* If good success, continue using the "search" mode;
2138                  * no need to send new link quality command, since we're
2139                  * continuing to use the setup that we've been trying. */
2140                 if (window->average_tpt > lq_sta->last_tpt) {
2141                         IWL_DEBUG_RATE(mvm,
2142                                        "SWITCHING TO NEW TABLE SR: %d "
2143                                        "cur-tpt %d old-tpt %d\n",
2144                                        window->success_ratio,
2145                                        window->average_tpt,
2146                                        lq_sta->last_tpt);
2147
2148                         /* Swap tables; "search" becomes "active" */
2149                         lq_sta->active_tbl = active_tbl;
2150                         current_tpt = window->average_tpt;
2151                 /* Else poor success; go back to mode in "active" table */
2152                 } else {
2153                         IWL_DEBUG_RATE(mvm,
2154                                        "GOING BACK TO THE OLD TABLE: SR %d "
2155                                        "cur-tpt %d old-tpt %d\n",
2156                                        window->success_ratio,
2157                                        window->average_tpt,
2158                                        lq_sta->last_tpt);
2159
2160                         /* Nullify "search" table */
2161                         rate->type = LQ_NONE;
2162
2163                         /* Revert to "active" table */
2164                         active_tbl = lq_sta->active_tbl;
2165                         tbl = &(lq_sta->lq_info[active_tbl]);
2166
2167                         /* Revert to "active" rate and throughput info */
2168                         index = tbl->rate.index;
2169                         current_tpt = lq_sta->last_tpt;
2170
2171                         /* Need to set up a new rate table in uCode */
2172                         update_lq = 1;
2173                 }
2174
2175                 /* Either way, we've made a decision; modulation mode
2176                  * search is done, allow rate adjustment next time. */
2177                 lq_sta->search_better_tbl = 0;
2178                 done_search = 1;        /* Don't switch modes below! */
2179                 goto lq_update;
2180         }
2181
2182         /* (Else) not in search of better modulation mode, try for better
2183          * starting rate, while staying in this mode. */
2184         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2185         low = high_low & 0xff;
2186         high = (high_low >> 8) & 0xff;
2187
2188         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2189
2190         sr = window->success_ratio;
2191
2192         /* Collect measured throughputs for current and adjacent rates */
2193         current_tpt = window->average_tpt;
2194         if (low != IWL_RATE_INVALID)
2195                 low_tpt = tbl->win[low].average_tpt;
2196         if (high != IWL_RATE_INVALID)
2197                 high_tpt = tbl->win[high].average_tpt;
2198
2199         IWL_DEBUG_RATE(mvm,
2200                        "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2201                        rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2202                        low, high, low_tpt, high_tpt);
2203
2204         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2205                                           current_tpt, low_tpt, high_tpt);
2206
2207         /* Force a search in case BT doesn't like us being in MIMO */
2208         if (is_mimo(rate) &&
2209             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2210                 IWL_DEBUG_RATE(mvm,
2211                                "BT Coex forbids MIMO. Search for new config\n");
2212                 rs_stay_in_table(lq_sta, true);
2213                 goto lq_update;
2214         }
2215
2216         switch (scale_action) {
2217         case RS_ACTION_DOWNSCALE:
2218                 /* Decrease starting rate, update uCode's rate table */
2219                 if (low != IWL_RATE_INVALID) {
2220                         update_lq = 1;
2221                         index = low;
2222                 } else {
2223                         IWL_DEBUG_RATE(mvm,
2224                                        "At the bottom rate. Can't decrease\n");
2225                 }
2226
2227                 break;
2228         case RS_ACTION_UPSCALE:
2229                 /* Increase starting rate, update uCode's rate table */
2230                 if (high != IWL_RATE_INVALID) {
2231                         update_lq = 1;
2232                         index = high;
2233                 } else {
2234                         IWL_DEBUG_RATE(mvm,
2235                                        "At the top rate. Can't increase\n");
2236                 }
2237
2238                 break;
2239         case RS_ACTION_STAY:
2240                 /* No change */
2241                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2242                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2243                 break;
2244         default:
2245                 break;
2246         }
2247
2248 lq_update:
2249         /* Replace uCode's rate table for the destination station. */
2250         if (update_lq) {
2251                 tbl->rate.index = index;
2252                 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2253         }
2254
2255         rs_stay_in_table(lq_sta, false);
2256
2257         /*
2258          * Search for new modulation mode if we're:
2259          * 1)  Not changing rates right now
2260          * 2)  Not just finishing up a search
2261          * 3)  Allowing a new search
2262          */
2263         if (!update_lq && !done_search &&
2264             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2265             && window->counter) {
2266                 enum rs_column next_column;
2267
2268                 /* Save current throughput to compare with "search" throughput*/
2269                 lq_sta->last_tpt = current_tpt;
2270
2271                 IWL_DEBUG_RATE(mvm,
2272                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2273                                update_lq, done_search, lq_sta->rs_state,
2274                                window->counter);
2275
2276                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2277                 if (next_column != RS_COLUMN_INVALID) {
2278                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2279                                                       next_column);
2280                         if (!ret)
2281                                 lq_sta->search_better_tbl = 1;
2282                 } else {
2283                         IWL_DEBUG_RATE(mvm,
2284                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2285                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2286                 }
2287
2288                 /* If new "search" mode was selected, set up in uCode table */
2289                 if (lq_sta->search_better_tbl) {
2290                         /* Access the "search" table, clear its history. */
2291                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2292                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2293
2294                         /* Use new "search" start rate */
2295                         index = tbl->rate.index;
2296
2297                         rs_dump_rate(mvm, &tbl->rate,
2298                                      "Switch to SEARCH TABLE:");
2299                         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
2300                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2301                 } else {
2302                         done_search = 1;
2303                 }
2304         }
2305
2306         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2307                 /* If the "active" (non-search) mode was legacy,
2308                  * and we've tried switching antennas,
2309                  * but we haven't been able to try HT modes (not available),
2310                  * stay with best antenna legacy modulation for a while
2311                  * before next round of mode comparisons. */
2312                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2313                 if (is_legacy(&tbl1->rate)) {
2314                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2315
2316                         if (tid != IWL_MAX_TID_COUNT) {
2317                                 tid_data = &sta_priv->tid_data[tid];
2318                                 if (tid_data->state != IWL_AGG_OFF) {
2319                                         IWL_DEBUG_RATE(mvm,
2320                                                        "Stop aggregation on tid %d\n",
2321                                                        tid);
2322                                         ieee80211_stop_tx_ba_session(sta, tid);
2323                                 }
2324                         }
2325                         rs_set_stay_in_table(mvm, 1, lq_sta);
2326                 } else {
2327                 /* If we're in an HT mode, and all 3 mode switch actions
2328                  * have been tried and compared, stay in this best modulation
2329                  * mode for a while before next round of mode comparisons. */
2330                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2331                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2332                             (tid != IWL_MAX_TID_COUNT)) {
2333                                 tid_data = &sta_priv->tid_data[tid];
2334                                 if (tid_data->state == IWL_AGG_OFF) {
2335                                         IWL_DEBUG_RATE(mvm,
2336                                                        "try to aggregate tid %d\n",
2337                                                        tid);
2338                                         rs_tl_turn_on_agg(mvm, tid,
2339                                                           lq_sta, sta);
2340                                 }
2341                         }
2342                         rs_set_stay_in_table(mvm, 0, lq_sta);
2343                 }
2344         }
2345
2346 out:
2347         lq_sta->last_txrate_idx = index;
2348 }
2349
2350 struct rs_init_rate_info {
2351         s8 rssi;
2352         u8 rate_idx;
2353 };
2354
2355 static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
2356         { -60, IWL_RATE_54M_INDEX },
2357         { -64, IWL_RATE_48M_INDEX },
2358         { -68, IWL_RATE_36M_INDEX },
2359         { -80, IWL_RATE_24M_INDEX },
2360         { -84, IWL_RATE_18M_INDEX },
2361         { -85, IWL_RATE_12M_INDEX },
2362         { -86, IWL_RATE_11M_INDEX },
2363         { -88, IWL_RATE_5M_INDEX  },
2364         { -90, IWL_RATE_2M_INDEX  },
2365         { S8_MIN, IWL_RATE_1M_INDEX },
2366 };
2367
2368 static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
2369         { -60, IWL_RATE_54M_INDEX },
2370         { -64, IWL_RATE_48M_INDEX },
2371         { -72, IWL_RATE_36M_INDEX },
2372         { -80, IWL_RATE_24M_INDEX },
2373         { -84, IWL_RATE_18M_INDEX },
2374         { -85, IWL_RATE_12M_INDEX },
2375         { -87, IWL_RATE_9M_INDEX  },
2376         { S8_MIN, IWL_RATE_6M_INDEX },
2377 };
2378
2379 /* Choose an initial legacy rate and antenna to use based on the RSSI
2380  * of last Rx
2381  */
2382 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2383                                 struct iwl_lq_sta *lq_sta,
2384                                 enum ieee80211_band band,
2385                                 struct rs_rate *rate)
2386 {
2387         int i, nentries;
2388         s8 best_rssi = S8_MIN;
2389         u8 best_ant = ANT_NONE;
2390         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2391         const struct rs_init_rate_info *initial_rates;
2392
2393         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2394                 if (!(lq_sta->pers.chains & BIT(i)))
2395                         continue;
2396
2397                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2398                         best_rssi = lq_sta->pers.chain_signal[i];
2399                         best_ant = BIT(i);
2400                 }
2401         }
2402
2403         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2404                        rs_pretty_ant(best_ant), best_rssi);
2405
2406         if (best_ant != ANT_A && best_ant != ANT_B)
2407                 rate->ant = first_antenna(valid_tx_ant);
2408         else
2409                 rate->ant = best_ant;
2410
2411         rate->sgi = false;
2412         rate->ldpc = false;
2413         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2414
2415         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2416                                      BITS_PER_LONG);
2417
2418         if (band == IEEE80211_BAND_5GHZ) {
2419                 rate->type = LQ_LEGACY_A;
2420                 initial_rates = rs_init_rates_5ghz;
2421                 nentries = ARRAY_SIZE(rs_init_rates_5ghz);
2422         } else {
2423                 rate->type = LQ_LEGACY_G;
2424                 initial_rates = rs_init_rates_24ghz;
2425                 nentries = ARRAY_SIZE(rs_init_rates_24ghz);
2426         }
2427
2428         if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2429                 for (i = 0; i < nentries; i++) {
2430                         int rate_idx = initial_rates[i].rate_idx;
2431                         if ((best_rssi >= initial_rates[i].rssi) &&
2432                             (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2433                                 rate->index = rate_idx;
2434                                 break;
2435                         }
2436                 }
2437         }
2438
2439         IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2440                        rs_pretty_ant(rate->ant));
2441 }
2442
2443 /* Save info about RSSI of last Rx */
2444 void rs_update_last_rssi(struct iwl_mvm *mvm,
2445                          struct iwl_lq_sta *lq_sta,
2446                          struct ieee80211_rx_status *rx_status)
2447 {
2448         lq_sta->pers.chains = rx_status->chains;
2449         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2450         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2451         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2452 }
2453
2454 /**
2455  * rs_initialize_lq - Initialize a station's hardware rate table
2456  *
2457  * The uCode's station table contains a table of fallback rates
2458  * for automatic fallback during transmission.
2459  *
2460  * NOTE: This sets up a default set of values.  These will be replaced later
2461  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2462  *       rc80211_simple.
2463  *
2464  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2465  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2466  *       which requires station table entry to exist).
2467  */
2468 static void rs_initialize_lq(struct iwl_mvm *mvm,
2469                              struct ieee80211_sta *sta,
2470                              struct iwl_lq_sta *lq_sta,
2471                              enum ieee80211_band band,
2472                              bool init)
2473 {
2474         struct iwl_scale_tbl_info *tbl;
2475         struct rs_rate *rate;
2476         u8 active_tbl = 0;
2477
2478         if (!sta || !lq_sta)
2479                 return;
2480
2481         if (!lq_sta->search_better_tbl)
2482                 active_tbl = lq_sta->active_tbl;
2483         else
2484                 active_tbl = 1 - lq_sta->active_tbl;
2485
2486         tbl = &(lq_sta->lq_info[active_tbl]);
2487         rate = &tbl->rate;
2488
2489         rs_get_initial_rate(mvm, lq_sta, band, rate);
2490         lq_sta->last_txrate_idx = rate->index;
2491
2492         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2493         if (rate->ant == ANT_A)
2494                 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2495         else
2496                 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2497
2498         rs_set_expected_tpt_table(lq_sta, tbl);
2499         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2500         /* TODO restore station should remember the lq cmd */
2501         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2502 }
2503
2504 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2505                         struct ieee80211_tx_rate_control *txrc)
2506 {
2507         struct sk_buff *skb = txrc->skb;
2508         struct iwl_op_mode *op_mode __maybe_unused =
2509                         (struct iwl_op_mode *)mvm_r;
2510         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2511         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2512         struct iwl_lq_sta *lq_sta = mvm_sta;
2513
2514         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2515
2516         /* Treat uninitialized rate scaling data same as non-existing. */
2517         if (lq_sta && !lq_sta->pers.drv) {
2518                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2519                 mvm_sta = NULL;
2520         }
2521
2522         /* Send management frames and NO_ACK data using lowest rate. */
2523         if (rate_control_send_low(sta, mvm_sta, txrc))
2524                 return;
2525
2526         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2527                                   info->band, &info->control.rates[0]);
2528
2529         info->control.rates[0].count = 1;
2530 }
2531
2532 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2533                           gfp_t gfp)
2534 {
2535         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2536         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2537         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2538         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2539
2540         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2541
2542         lq_sta->pers.drv = mvm;
2543 #ifdef CONFIG_MAC80211_DEBUGFS
2544         lq_sta->pers.dbg_fixed_rate = 0;
2545         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2546 #endif
2547         lq_sta->pers.chains = 0;
2548         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2549
2550         return &sta_priv->lq_sta;
2551 }
2552
2553 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2554                                        int nss)
2555 {
2556         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2557                 (0x3 << (2 * (nss - 1)));
2558         rx_mcs >>= (2 * (nss - 1));
2559
2560         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2561                 return IWL_RATE_MCS_7_INDEX;
2562         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2563                 return IWL_RATE_MCS_8_INDEX;
2564         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2565                 return IWL_RATE_MCS_9_INDEX;
2566
2567         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2568         return -1;
2569 }
2570
2571 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2572                                      struct ieee80211_sta_vht_cap *vht_cap,
2573                                      struct iwl_lq_sta *lq_sta)
2574 {
2575         int i;
2576         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2577
2578         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2579                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2580                         if (i == IWL_RATE_9M_INDEX)
2581                                 continue;
2582
2583                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2584                         if (i == IWL_RATE_MCS_9_INDEX &&
2585                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2586                                 continue;
2587
2588                         lq_sta->active_siso_rate |= BIT(i);
2589                 }
2590         }
2591
2592         if (sta->rx_nss < 2)
2593                 return;
2594
2595         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2596         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2597                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2598                         if (i == IWL_RATE_9M_INDEX)
2599                                 continue;
2600
2601                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2602                         if (i == IWL_RATE_MCS_9_INDEX &&
2603                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2604                                 continue;
2605
2606                         lq_sta->active_mimo2_rate |= BIT(i);
2607                 }
2608         }
2609 }
2610
2611 static void rs_ht_init(struct iwl_mvm *mvm,
2612                        struct ieee80211_sta *sta,
2613                        struct iwl_lq_sta *lq_sta,
2614                        struct ieee80211_sta_ht_cap *ht_cap)
2615 {
2616         /* active_siso_rate mask includes 9 MBits (bit 5),
2617          * and CCK (bits 0-3), supp_rates[] does not;
2618          * shift to convert format, force 9 MBits off.
2619          */
2620         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2621         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2622         lq_sta->active_siso_rate &= ~((u16)0x2);
2623         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2624
2625         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2626         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2627         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2628         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2629
2630         if (mvm->cfg->ht_params->ldpc &&
2631             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2632                 lq_sta->ldpc = true;
2633
2634         if (mvm->cfg->ht_params->stbc &&
2635             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2636             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2637                 lq_sta->stbc_capable = true;
2638
2639         lq_sta->is_vht = false;
2640 }
2641
2642 static void rs_vht_init(struct iwl_mvm *mvm,
2643                         struct ieee80211_sta *sta,
2644                         struct iwl_lq_sta *lq_sta,
2645                         struct ieee80211_sta_vht_cap *vht_cap)
2646 {
2647         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2648
2649         if (mvm->cfg->ht_params->ldpc &&
2650             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2651                 lq_sta->ldpc = true;
2652
2653         if (mvm->cfg->ht_params->stbc &&
2654             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2655             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2656                 lq_sta->stbc_capable = true;
2657
2658         if ((mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2659             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2660             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2661                 lq_sta->bfer_capable = true;
2662
2663         lq_sta->is_vht = true;
2664 }
2665
2666 #ifdef CONFIG_IWLWIFI_DEBUGFS
2667 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2668 {
2669         spin_lock_bh(&mvm->drv_stats_lock);
2670         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2671         spin_unlock_bh(&mvm->drv_stats_lock);
2672 }
2673
2674 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2675 {
2676         u8 nss = 0, mcs = 0;
2677
2678         spin_lock(&mvm->drv_stats_lock);
2679
2680         if (agg)
2681                 mvm->drv_rx_stats.agg_frames++;
2682
2683         mvm->drv_rx_stats.success_frames++;
2684
2685         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2686         case RATE_MCS_CHAN_WIDTH_20:
2687                 mvm->drv_rx_stats.bw_20_frames++;
2688                 break;
2689         case RATE_MCS_CHAN_WIDTH_40:
2690                 mvm->drv_rx_stats.bw_40_frames++;
2691                 break;
2692         case RATE_MCS_CHAN_WIDTH_80:
2693                 mvm->drv_rx_stats.bw_80_frames++;
2694                 break;
2695         default:
2696                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2697         }
2698
2699         if (rate & RATE_MCS_HT_MSK) {
2700                 mvm->drv_rx_stats.ht_frames++;
2701                 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2702                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2703         } else if (rate & RATE_MCS_VHT_MSK) {
2704                 mvm->drv_rx_stats.vht_frames++;
2705                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2706                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2707                        RATE_VHT_MCS_NSS_POS) + 1;
2708         } else {
2709                 mvm->drv_rx_stats.legacy_frames++;
2710         }
2711
2712         if (nss == 1)
2713                 mvm->drv_rx_stats.siso_frames++;
2714         else if (nss == 2)
2715                 mvm->drv_rx_stats.mimo2_frames++;
2716
2717         if (rate & RATE_MCS_SGI_MSK)
2718                 mvm->drv_rx_stats.sgi_frames++;
2719         else
2720                 mvm->drv_rx_stats.ngi_frames++;
2721
2722         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2723         mvm->drv_rx_stats.last_frame_idx =
2724                 (mvm->drv_rx_stats.last_frame_idx + 1) %
2725                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2726
2727         spin_unlock(&mvm->drv_stats_lock);
2728 }
2729 #endif
2730
2731 /*
2732  * Called after adding a new station to initialize rate scaling
2733  */
2734 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2735                           enum ieee80211_band band, bool init)
2736 {
2737         int i, j;
2738         struct ieee80211_hw *hw = mvm->hw;
2739         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2740         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2741         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2742         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2743         struct ieee80211_supported_band *sband;
2744         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2745
2746         /* clear all non-persistent lq data */
2747         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2748
2749         sband = hw->wiphy->bands[band];
2750
2751         lq_sta->lq.sta_id = sta_priv->sta_id;
2752
2753         for (j = 0; j < LQ_SIZE; j++)
2754                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2755
2756         lq_sta->flush_timer = 0;
2757         lq_sta->last_tx = jiffies;
2758
2759         IWL_DEBUG_RATE(mvm,
2760                        "LQ: *** rate scale station global init for station %d ***\n",
2761                        sta_priv->sta_id);
2762         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2763          * the lowest or the highest rate.. Could consider using RSSI from
2764          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2765          * after assoc.. */
2766
2767         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2768         lq_sta->band = sband->band;
2769         /*
2770          * active legacy rates as per supported rates bitmap
2771          */
2772         supp = sta->supp_rates[sband->band];
2773         lq_sta->active_legacy_rate = 0;
2774         for_each_set_bit(i, &supp, BITS_PER_LONG)
2775                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2776
2777         /* TODO: should probably account for rx_highest for both HT/VHT */
2778         if (!vht_cap || !vht_cap->vht_supported)
2779                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
2780         else
2781                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
2782
2783         if (IWL_MVM_RS_DISABLE_P2P_MIMO && sta_priv->vif->p2p)
2784                 lq_sta->active_mimo2_rate = 0;
2785
2786         lq_sta->max_legacy_rate_idx =
2787                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2788         lq_sta->max_siso_rate_idx =
2789                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2790         lq_sta->max_mimo2_rate_idx =
2791                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2792
2793         IWL_DEBUG_RATE(mvm,
2794                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2795                        lq_sta->active_legacy_rate,
2796                        lq_sta->active_siso_rate,
2797                        lq_sta->active_mimo2_rate,
2798                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
2799                        lq_sta->bfer_capable);
2800         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2801                        lq_sta->max_legacy_rate_idx,
2802                        lq_sta->max_siso_rate_idx,
2803                        lq_sta->max_mimo2_rate_idx);
2804
2805         /* These values will be overridden later */
2806         lq_sta->lq.single_stream_ant_msk =
2807                 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
2808         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2809
2810         /* as default allow aggregation for all tids */
2811         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2812         lq_sta->is_agg = 0;
2813 #ifdef CONFIG_IWLWIFI_DEBUGFS
2814         iwl_mvm_reset_frame_stats(mvm);
2815 #endif
2816         rs_initialize_lq(mvm, sta, lq_sta, band, init);
2817 }
2818
2819 static void rs_rate_update(void *mvm_r,
2820                            struct ieee80211_supported_band *sband,
2821                            struct cfg80211_chan_def *chandef,
2822                            struct ieee80211_sta *sta, void *priv_sta,
2823                            u32 changed)
2824 {
2825         u8 tid;
2826         struct iwl_op_mode *op_mode  =
2827                         (struct iwl_op_mode *)mvm_r;
2828         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2829
2830         /* Stop any ongoing aggregations as rs starts off assuming no agg */
2831         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2832                 ieee80211_stop_tx_ba_session(sta, tid);
2833
2834         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2835 }
2836
2837 #ifdef CONFIG_MAC80211_DEBUGFS
2838 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2839                                             struct iwl_lq_cmd *lq_cmd,
2840                                             enum ieee80211_band band,
2841                                             u32 ucode_rate)
2842 {
2843         struct rs_rate rate;
2844         int i;
2845         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2846         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2847         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2848
2849         for (i = 0; i < num_rates; i++)
2850                 lq_cmd->rs_table[i] = ucode_rate_le32;
2851
2852         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2853
2854         if (is_mimo(&rate))
2855                 lq_cmd->mimo_delim = num_rates - 1;
2856         else
2857                 lq_cmd->mimo_delim = 0;
2858
2859         lq_cmd->reduced_tpc = 0;
2860
2861         if (num_of_ant(ant) == 1)
2862                 lq_cmd->single_stream_ant_msk = ant;
2863
2864         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2865 }
2866 #endif /* CONFIG_MAC80211_DEBUGFS */
2867
2868 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2869                                      struct iwl_lq_sta *lq_sta,
2870                                      struct rs_rate *rate,
2871                                      __le32 *rs_table, int *rs_table_index,
2872                                      int num_rates, int num_retries,
2873                                      u8 valid_tx_ant, bool toggle_ant)
2874 {
2875         int i, j;
2876         __le32 ucode_rate;
2877         bool bottom_reached = false;
2878         int prev_rate_idx = rate->index;
2879         int end = LINK_QUAL_MAX_RETRY_NUM;
2880         int index = *rs_table_index;
2881
2882         for (i = 0; i < num_rates && index < end; i++) {
2883                 for (j = 0; j < num_retries && index < end; j++, index++) {
2884                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
2885                                                                          rate));
2886                         rs_table[index] = ucode_rate;
2887                         if (toggle_ant)
2888                                 rs_toggle_antenna(valid_tx_ant, rate);
2889                 }
2890
2891                 prev_rate_idx = rate->index;
2892                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2893                 if (bottom_reached && !is_legacy(rate))
2894                         break;
2895         }
2896
2897         if (!bottom_reached && !is_legacy(rate))
2898                 rate->index = prev_rate_idx;
2899
2900         *rs_table_index = index;
2901 }
2902
2903 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2904  * column the rate table should look like this:
2905  *
2906  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2907  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2908  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2909  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2910  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2911  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2912  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2913  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2914  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2915  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2916  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2917  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2918  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2919  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2920  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2921  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2922  */
2923 static void rs_build_rates_table(struct iwl_mvm *mvm,
2924                                  struct ieee80211_sta *sta,
2925                                  struct iwl_lq_sta *lq_sta,
2926                                  const struct rs_rate *initial_rate)
2927 {
2928         struct rs_rate rate;
2929         int num_rates, num_retries, index = 0;
2930         u8 valid_tx_ant = 0;
2931         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2932         bool toggle_ant = false;
2933
2934         memcpy(&rate, initial_rate, sizeof(rate));
2935
2936         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2937
2938         /* TODO: remove old API when min FW API hits 14 */
2939         if (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
2940             rs_stbc_allow(mvm, sta, lq_sta))
2941                 rate.stbc = true;
2942
2943         if (is_siso(&rate)) {
2944                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
2945                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
2946         } else if (is_mimo(&rate)) {
2947                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
2948                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
2949         } else {
2950                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
2951                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
2952                 toggle_ant = true;
2953         }
2954
2955         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2956                                  num_rates, num_retries, valid_tx_ant,
2957                                  toggle_ant);
2958
2959         rs_get_lower_rate_down_column(lq_sta, &rate);
2960
2961         if (is_siso(&rate)) {
2962                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
2963                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
2964                 lq_cmd->mimo_delim = index;
2965         } else if (is_legacy(&rate)) {
2966                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
2967                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
2968         } else {
2969                 WARN_ON_ONCE(1);
2970         }
2971
2972         toggle_ant = true;
2973
2974         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2975                                  num_rates, num_retries, valid_tx_ant,
2976                                  toggle_ant);
2977
2978         rs_get_lower_rate_down_column(lq_sta, &rate);
2979
2980         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
2981         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
2982
2983         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2984                                  num_rates, num_retries, valid_tx_ant,
2985                                  toggle_ant);
2986
2987 }
2988
2989 struct rs_bfer_active_iter_data {
2990         struct ieee80211_sta *exclude_sta;
2991         struct iwl_mvm_sta *bfer_mvmsta;
2992 };
2993
2994 static void rs_bfer_active_iter(void *_data,
2995                                 struct ieee80211_sta *sta)
2996 {
2997         struct rs_bfer_active_iter_data *data = _data;
2998         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2999         struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3000         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3001
3002         if (sta == data->exclude_sta)
3003                 return;
3004
3005         /* The current sta has BFER allowed */
3006         if (ss_params & LQ_SS_BFER_ALLOWED) {
3007                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3008
3009                 data->bfer_mvmsta = mvmsta;
3010         }
3011 }
3012
3013 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3014 {
3015         int prio = -1;
3016         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3017
3018         switch (viftype) {
3019         case NL80211_IFTYPE_AP:
3020         case NL80211_IFTYPE_P2P_GO:
3021                 prio = 3;
3022                 break;
3023         case NL80211_IFTYPE_P2P_CLIENT:
3024                 prio = 2;
3025                 break;
3026         case NL80211_IFTYPE_STATION:
3027                 prio = 1;
3028                 break;
3029         default:
3030                 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3031                 prio = -1;
3032         }
3033
3034         return prio;
3035 }
3036
3037 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3038 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3039                                 struct iwl_mvm_sta *sta2)
3040 {
3041         int prio1 = rs_bfer_priority(sta1);
3042         int prio2 = rs_bfer_priority(sta2);
3043
3044         if (prio1 > prio2)
3045                 return 1;
3046         if (prio1 < prio2)
3047                 return -1;
3048         return 0;
3049 }
3050
3051 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3052                                 struct ieee80211_sta *sta,
3053                                 struct iwl_lq_sta *lq_sta,
3054                                 const struct rs_rate *initial_rate)
3055 {
3056         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3057         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3058         struct rs_bfer_active_iter_data data = {
3059                 .exclude_sta = sta,
3060                 .bfer_mvmsta = NULL,
3061         };
3062         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3063         u32 ss_params = LQ_SS_PARAMS_VALID;
3064
3065         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3066                 goto out;
3067
3068         /* Check if forcing the decision is configured.
3069          * Note that SISO is forced by not allowing STBC or BFER
3070          */
3071         if (lq_sta->ss_force == RS_SS_FORCE_STBC)
3072                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3073         else if (lq_sta->ss_force == RS_SS_FORCE_BFER)
3074                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3075
3076         if (lq_sta->ss_force != RS_SS_FORCE_NONE) {
3077                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3078                                lq_sta->ss_force);
3079                 goto out;
3080         }
3081
3082         if (lq_sta->stbc_capable)
3083                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3084
3085         if (!lq_sta->bfer_capable)
3086                 goto out;
3087
3088         ieee80211_iterate_stations_atomic(mvm->hw,
3089                                           rs_bfer_active_iter,
3090                                           &data);
3091         bfer_mvmsta = data.bfer_mvmsta;
3092
3093         /* This code is safe as it doesn't run concurrently for different
3094          * stations. This is guaranteed by the fact that calls to
3095          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3096          */
3097         if (!bfer_mvmsta) {
3098                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3099
3100                 ss_params |= LQ_SS_BFER_ALLOWED;
3101                 goto out;
3102         }
3103
3104         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3105                        bfer_mvmsta->sta_id);
3106
3107         /* Disallow BFER on another STA if active and we're a higher priority */
3108         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3109                 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3110                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3111
3112                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3113                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3114                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3115
3116                 ss_params |= LQ_SS_BFER_ALLOWED;
3117                 IWL_DEBUG_RATE(mvm,
3118                                "Lower priority BFER sta found (%d). Switch BFER\n",
3119                                bfer_mvmsta->sta_id);
3120         }
3121 out:
3122         lq_cmd->ss_params = cpu_to_le32(ss_params);
3123 }
3124
3125 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3126                            struct ieee80211_sta *sta,
3127                            struct iwl_lq_sta *lq_sta,
3128                            const struct rs_rate *initial_rate)
3129 {
3130         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3131         struct iwl_mvm_sta *mvmsta;
3132         struct iwl_mvm_vif *mvmvif;
3133
3134         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3135         lq_cmd->agg_time_limit =
3136                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3137
3138 #ifdef CONFIG_MAC80211_DEBUGFS
3139         if (lq_sta->pers.dbg_fixed_rate) {
3140                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3141                                                 lq_sta->band,
3142                                                 lq_sta->pers.dbg_fixed_rate);
3143                 return;
3144         }
3145 #endif
3146         if (WARN_ON_ONCE(!sta || !initial_rate))
3147                 return;
3148
3149         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3150
3151         if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS)
3152                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3153
3154         if (num_of_ant(initial_rate->ant) == 1)
3155                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3156
3157         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3158         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3159
3160         if (num_of_ant(initial_rate->ant) == 1)
3161                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3162
3163         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3164
3165         /*
3166          * In case of low latency, tell the firwmare to leave a frame in the
3167          * Tx Fifo so that it can start a transaction in the same TxOP. This
3168          * basically allows the firmware to send bursts.
3169          */
3170         if (iwl_mvm_vif_low_latency(mvmvif)) {
3171                 lq_cmd->agg_frame_cnt_limit--;
3172
3173                 if (mvm->low_latency_agg_frame_limit)
3174                         lq_cmd->agg_frame_cnt_limit =
3175                                 min(lq_cmd->agg_frame_cnt_limit,
3176                                     mvm->low_latency_agg_frame_limit);
3177         }
3178
3179         if (mvmsta->vif->p2p)
3180                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3181
3182         lq_cmd->agg_time_limit =
3183                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3184 }
3185
3186 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3187 {
3188         return hw->priv;
3189 }
3190 /* rate scale requires free function to be implemented */
3191 static void rs_free(void *mvm_rate)
3192 {
3193         return;
3194 }
3195
3196 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3197                         void *mvm_sta)
3198 {
3199         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3200         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3201
3202         IWL_DEBUG_RATE(mvm, "enter\n");
3203         IWL_DEBUG_RATE(mvm, "leave\n");
3204 }
3205
3206 #ifdef CONFIG_MAC80211_DEBUGFS
3207 int rs_pretty_print_rate(char *buf, const u32 rate)
3208 {
3209
3210         char *type, *bw;
3211         u8 mcs = 0, nss = 0;
3212         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3213
3214         if (!(rate & RATE_MCS_HT_MSK) &&
3215             !(rate & RATE_MCS_VHT_MSK)) {
3216                 int index = iwl_hwrate_to_plcp_idx(rate);
3217
3218                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3219                                rs_pretty_ant(ant),
3220                                index == IWL_RATE_INVALID ? "BAD" :
3221                                iwl_rate_mcs[index].mbps);
3222         }
3223
3224         if (rate & RATE_MCS_VHT_MSK) {
3225                 type = "VHT";
3226                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3227                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3228                        >> RATE_VHT_MCS_NSS_POS) + 1;
3229         } else if (rate & RATE_MCS_HT_MSK) {
3230                 type = "HT";
3231                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3232         } else {
3233                 type = "Unknown"; /* shouldn't happen */
3234         }
3235
3236         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3237         case RATE_MCS_CHAN_WIDTH_20:
3238                 bw = "20Mhz";
3239                 break;
3240         case RATE_MCS_CHAN_WIDTH_40:
3241                 bw = "40Mhz";
3242                 break;
3243         case RATE_MCS_CHAN_WIDTH_80:
3244                 bw = "80Mhz";
3245                 break;
3246         case RATE_MCS_CHAN_WIDTH_160:
3247                 bw = "160Mhz";
3248                 break;
3249         default:
3250                 bw = "BAD BW";
3251         }
3252
3253         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3254                        type, rs_pretty_ant(ant), bw, mcs, nss,
3255                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3256                        (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3257                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3258                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3259                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3260 }
3261
3262 /**
3263  * Program the device to use fixed rate for frame transmit
3264  * This is for debugging/testing only
3265  * once the device start use fixed rate, we need to reload the module
3266  * to being back the normal operation.
3267  */
3268 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3269                                 struct iwl_lq_sta *lq_sta)
3270 {
3271         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3272         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3273         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3274
3275         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3276                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3277
3278         if (lq_sta->pers.dbg_fixed_rate) {
3279                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3280                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3281         }
3282 }
3283
3284 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3285                         const char __user *user_buf, size_t count, loff_t *ppos)
3286 {
3287         struct iwl_lq_sta *lq_sta = file->private_data;
3288         struct iwl_mvm *mvm;
3289         char buf[64];
3290         size_t buf_size;
3291         u32 parsed_rate;
3292
3293         mvm = lq_sta->pers.drv;
3294         memset(buf, 0, sizeof(buf));
3295         buf_size = min(count, sizeof(buf) -  1);
3296         if (copy_from_user(buf, user_buf, buf_size))
3297                 return -EFAULT;
3298
3299         if (sscanf(buf, "%x", &parsed_rate) == 1)
3300                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3301         else
3302                 lq_sta->pers.dbg_fixed_rate = 0;
3303
3304         rs_program_fix_rate(mvm, lq_sta);
3305
3306         return count;
3307 }
3308
3309 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3310                         char __user *user_buf, size_t count, loff_t *ppos)
3311 {
3312         char *buff;
3313         int desc = 0;
3314         int i = 0;
3315         ssize_t ret;
3316
3317         struct iwl_lq_sta *lq_sta = file->private_data;
3318         struct iwl_mvm *mvm;
3319         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3320         struct rs_rate *rate = &tbl->rate;
3321         mvm = lq_sta->pers.drv;
3322         buff = kmalloc(2048, GFP_KERNEL);
3323         if (!buff)
3324                 return -ENOMEM;
3325
3326         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3327         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3328                         lq_sta->total_failed, lq_sta->total_success,
3329                         lq_sta->active_legacy_rate);
3330         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3331                         lq_sta->pers.dbg_fixed_rate);
3332         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3333             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3334             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3335             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3336         desc += sprintf(buff+desc, "lq type %s\n",
3337                         (is_legacy(rate)) ? "legacy" :
3338                         is_vht(rate) ? "VHT" : "HT");
3339         if (!is_legacy(rate)) {
3340                 desc += sprintf(buff+desc, " %s",
3341                    (is_siso(rate)) ? "SISO" : "MIMO2");
3342                    desc += sprintf(buff+desc, " %s",
3343                                    (is_ht20(rate)) ? "20MHz" :
3344                                    (is_ht40(rate)) ? "40MHz" :
3345                                    (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3346                    desc += sprintf(buff+desc, " %s %s %s\n",
3347                                    (rate->sgi) ? "SGI" : "NGI",
3348                                    (rate->ldpc) ? "LDPC" : "BCC",
3349                                    (lq_sta->is_agg) ? "AGG on" : "");
3350         }
3351         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3352                         lq_sta->last_rate_n_flags);
3353         desc += sprintf(buff+desc,
3354                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3355                         lq_sta->lq.flags,
3356                         lq_sta->lq.mimo_delim,
3357                         lq_sta->lq.single_stream_ant_msk,
3358                         lq_sta->lq.dual_stream_ant_msk);
3359
3360         desc += sprintf(buff+desc,
3361                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3362                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3363                         lq_sta->lq.agg_disable_start_th,
3364                         lq_sta->lq.agg_frame_cnt_limit);
3365
3366         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3367         desc += sprintf(buff+desc,
3368                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3369                         lq_sta->lq.initial_rate_index[0],
3370                         lq_sta->lq.initial_rate_index[1],
3371                         lq_sta->lq.initial_rate_index[2],
3372                         lq_sta->lq.initial_rate_index[3]);
3373
3374         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3375                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3376
3377                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3378                 desc += rs_pretty_print_rate(buff+desc, r);
3379         }
3380
3381         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3382         kfree(buff);
3383         return ret;
3384 }
3385
3386 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3387         .write = rs_sta_dbgfs_scale_table_write,
3388         .read = rs_sta_dbgfs_scale_table_read,
3389         .open = simple_open,
3390         .llseek = default_llseek,
3391 };
3392 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3393                         char __user *user_buf, size_t count, loff_t *ppos)
3394 {
3395         char *buff;
3396         int desc = 0;
3397         int i, j;
3398         ssize_t ret;
3399         struct iwl_scale_tbl_info *tbl;
3400         struct rs_rate *rate;
3401         struct iwl_lq_sta *lq_sta = file->private_data;
3402
3403         buff = kmalloc(1024, GFP_KERNEL);
3404         if (!buff)
3405                 return -ENOMEM;
3406
3407         for (i = 0; i < LQ_SIZE; i++) {
3408                 tbl = &(lq_sta->lq_info[i]);
3409                 rate = &tbl->rate;
3410                 desc += sprintf(buff+desc,
3411                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3412                                 "index=%d\n",
3413                                 lq_sta->active_tbl == i ? "*" : "x",
3414                                 rate->type,
3415                                 rate->sgi,
3416                                 is_ht20(rate) ? "20Mhz" :
3417                                 is_ht40(rate) ? "40Mhz" :
3418                                 is_ht80(rate) ? "80Mhz" : "ERR",
3419                                 rate->index);
3420                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3421                         desc += sprintf(buff+desc,
3422                                 "counter=%d success=%d %%=%d\n",
3423                                 tbl->win[j].counter,
3424                                 tbl->win[j].success_counter,
3425                                 tbl->win[j].success_ratio);
3426                 }
3427         }
3428         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3429         kfree(buff);
3430         return ret;
3431 }
3432
3433 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3434         .read = rs_sta_dbgfs_stats_table_read,
3435         .open = simple_open,
3436         .llseek = default_llseek,
3437 };
3438
3439 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3440                                               char __user *user_buf,
3441                                               size_t count, loff_t *ppos)
3442 {
3443         static const char * const column_name[] = {
3444                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3445                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3446                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3447                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3448                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3449                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3450                 [RS_COLUMN_MIMO2] = "MIMO2",
3451                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3452         };
3453
3454         static const char * const rate_name[] = {
3455                 [IWL_RATE_1M_INDEX] = "1M",
3456                 [IWL_RATE_2M_INDEX] = "2M",
3457                 [IWL_RATE_5M_INDEX] = "5.5M",
3458                 [IWL_RATE_11M_INDEX] = "11M",
3459                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3460                 [IWL_RATE_9M_INDEX] = "9M",
3461                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3462                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3463                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3464                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3465                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3466                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3467                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3468                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3469                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3470         };
3471
3472         char *buff, *pos, *endpos;
3473         int col, rate;
3474         ssize_t ret;
3475         struct iwl_lq_sta *lq_sta = file->private_data;
3476         struct rs_rate_stats *stats;
3477         static const size_t bufsz = 1024;
3478
3479         buff = kmalloc(bufsz, GFP_KERNEL);
3480         if (!buff)
3481                 return -ENOMEM;
3482
3483         pos = buff;
3484         endpos = pos + bufsz;
3485
3486         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3487         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3488                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3489         pos += scnprintf(pos, endpos - pos, "\n");
3490
3491         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3492                 pos += scnprintf(pos, endpos - pos,
3493                                  "%s,", column_name[col]);
3494
3495                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3496                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3497                         pos += scnprintf(pos, endpos - pos,
3498                                          "%llu/%llu,",
3499                                          stats->success,
3500                                          stats->total);
3501                 }
3502                 pos += scnprintf(pos, endpos - pos, "\n");
3503         }
3504
3505         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3506         kfree(buff);
3507         return ret;
3508 }
3509
3510 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3511                                                const char __user *user_buf,
3512                                                size_t count, loff_t *ppos)
3513 {
3514         struct iwl_lq_sta *lq_sta = file->private_data;
3515         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3516
3517         return count;
3518 }
3519
3520 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3521         .read = rs_sta_dbgfs_drv_tx_stats_read,
3522         .write = rs_sta_dbgfs_drv_tx_stats_write,
3523         .open = simple_open,
3524         .llseek = default_llseek,
3525 };
3526
3527 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3528                                        char __user *user_buf,
3529                                        size_t count, loff_t *ppos)
3530 {
3531         struct iwl_lq_sta *lq_sta = file->private_data;
3532         char buf[12];
3533         int bufsz = sizeof(buf);
3534         int pos = 0;
3535         static const char * const ss_force_name[] = {
3536                 [RS_SS_FORCE_NONE] = "none",
3537                 [RS_SS_FORCE_STBC] = "stbc",
3538                 [RS_SS_FORCE_BFER] = "bfer",
3539                 [RS_SS_FORCE_SISO] = "siso",
3540         };
3541
3542         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3543                          ss_force_name[lq_sta->ss_force]);
3544         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3545 }
3546
3547 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3548                                         size_t count, loff_t *ppos)
3549 {
3550         struct iwl_mvm *mvm = lq_sta->pers.drv;
3551         int ret = 0;
3552
3553         if (!strncmp("none", buf, 4)) {
3554                 lq_sta->ss_force = RS_SS_FORCE_NONE;
3555         } else if (!strncmp("siso", buf, 4)) {
3556                 lq_sta->ss_force = RS_SS_FORCE_SISO;
3557         } else if (!strncmp("stbc", buf, 4)) {
3558                 if (lq_sta->stbc_capable) {
3559                         lq_sta->ss_force = RS_SS_FORCE_STBC;
3560                 } else {
3561                         IWL_ERR(mvm,
3562                                 "can't force STBC. peer doesn't support\n");
3563                         ret = -EINVAL;
3564                 }
3565         } else if (!strncmp("bfer", buf, 4)) {
3566                 if (lq_sta->bfer_capable) {
3567                         lq_sta->ss_force = RS_SS_FORCE_BFER;
3568                 } else {
3569                         IWL_ERR(mvm,
3570                                 "can't force BFER. peer doesn't support\n");
3571                         ret = -EINVAL;
3572                 }
3573         } else {
3574                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3575                 ret = -EINVAL;
3576         }
3577         return ret ?: count;
3578 }
3579
3580 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3581         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3582 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
3583                 if (!debugfs_create_file(#name, mode, parent, lq_sta,   \
3584                                          &iwl_dbgfs_##name##_ops))      \
3585                         goto err;                                       \
3586         } while (0)
3587
3588 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3589
3590 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3591 {
3592         struct iwl_lq_sta *lq_sta = mvm_sta;
3593
3594         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3595                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
3596         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3597                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
3598         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3599                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3600         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3601                           &lq_sta->tx_agg_tid_en);
3602         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3603                           &lq_sta->pers.dbg_fixed_txp_reduction);
3604
3605         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3606         return;
3607 err:
3608         IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3609 }
3610
3611 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3612 {
3613 }
3614 #endif
3615
3616 /*
3617  * Initialization of rate scaling information is done by driver after
3618  * the station is added. Since mac80211 calls this function before a
3619  * station is added we ignore it.
3620  */
3621 static void rs_rate_init_stub(void *mvm_r,
3622                               struct ieee80211_supported_band *sband,
3623                               struct cfg80211_chan_def *chandef,
3624                               struct ieee80211_sta *sta, void *mvm_sta)
3625 {
3626 }
3627
3628 static const struct rate_control_ops rs_mvm_ops = {
3629         .name = RS_NAME,
3630         .tx_status = rs_mac80211_tx_status,
3631         .get_rate = rs_get_rate,
3632         .rate_init = rs_rate_init_stub,
3633         .alloc = rs_alloc,
3634         .free = rs_free,
3635         .alloc_sta = rs_alloc_sta,
3636         .free_sta = rs_free_sta,
3637         .rate_update = rs_rate_update,
3638 #ifdef CONFIG_MAC80211_DEBUGFS
3639         .add_sta_debugfs = rs_add_debugfs,
3640         .remove_sta_debugfs = rs_remove_debugfs,
3641 #endif
3642 };
3643
3644 int iwl_mvm_rate_control_register(void)
3645 {
3646         return ieee80211_rate_control_register(&rs_mvm_ops);
3647 }
3648
3649 void iwl_mvm_rate_control_unregister(void)
3650 {
3651         ieee80211_rate_control_unregister(&rs_mvm_ops);
3652 }
3653
3654 /**
3655  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3656  * Tx protection, according to this rquest and previous requests,
3657  * and send the LQ command.
3658  * @mvmsta: The station
3659  * @enable: Enable Tx protection?
3660  */
3661 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3662                           bool enable)
3663 {
3664         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3665
3666         lockdep_assert_held(&mvm->mutex);
3667
3668         if (enable) {
3669                 if (mvmsta->tx_protection == 0)
3670                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
3671                 mvmsta->tx_protection++;
3672         } else {
3673                 mvmsta->tx_protection--;
3674                 if (mvmsta->tx_protection == 0)
3675                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3676         }
3677
3678         return iwl_mvm_send_lq_cmd(mvm, lq, false);
3679 }