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         struct iwl_mvm_sta *mvmsta;
 164         struct iwl_mvm_vif *mvmvif;
 165
 166         if (!sta->ht_cap.ht_supported)
 167                 return false;
 168
 169         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 170                 return false;
 171
 172         if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
 173                 return false;
 174
 175         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 176                 return false;
 177
 178         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 179         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 180         if (iwl_mvm_vif_low_latency(mvmvif) && mvmsta->vif->p2p)
 181                 return false;
 182
 183         return true;
 184 }
 185
 186 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 187                           struct iwl_scale_tbl_info *tbl,
 188                           const struct rs_tx_column *next_col)
 189 {
 190         if (!sta->ht_cap.ht_supported)
 191                 return false;
 192
 193         return true;
 194 }
 195
 196 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 197                          struct iwl_scale_tbl_info *tbl,
 198                          const struct rs_tx_column *next_col)
 199 {
 200         struct rs_rate *rate = &tbl->rate;
 201         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 202         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 203
 204         if (is_ht20(rate) && (ht_cap->cap &
 205                              IEEE80211_HT_CAP_SGI_20))
 206                 return true;
 207         if (is_ht40(rate) && (ht_cap->cap &
 208                              IEEE80211_HT_CAP_SGI_40))
 209                 return true;
 210         if (is_ht80(rate) && (vht_cap->cap &
 211                              IEEE80211_VHT_CAP_SHORT_GI_80))
 212                 return true;
 213
 214         return false;
 215 }
 216
 217 static const struct rs_tx_column rs_tx_columns[] = {
 218         [RS_COLUMN_LEGACY_ANT_A] = {
 219                 .mode = RS_LEGACY,
 220                 .ant = ANT_A,
 221                 .next_columns = {
 222                         RS_COLUMN_LEGACY_ANT_B,
 223                         RS_COLUMN_SISO_ANT_A,
 224                         RS_COLUMN_MIMO2,
 225                         RS_COLUMN_INVALID,
 226                         RS_COLUMN_INVALID,
 227                         RS_COLUMN_INVALID,
 228                         RS_COLUMN_INVALID,
 229                 },
 230                 .checks = {
 231                         rs_ant_allow,
 232                 },
 233         },
 234         [RS_COLUMN_LEGACY_ANT_B] = {
 235                 .mode = RS_LEGACY,
 236                 .ant = ANT_B,
 237                 .next_columns = {
 238                         RS_COLUMN_LEGACY_ANT_A,
 239                         RS_COLUMN_SISO_ANT_B,
 240                         RS_COLUMN_MIMO2,
 241                         RS_COLUMN_INVALID,
 242                         RS_COLUMN_INVALID,
 243                         RS_COLUMN_INVALID,
 244                         RS_COLUMN_INVALID,
 245                 },
 246                 .checks = {
 247                         rs_ant_allow,
 248                 },
 249         },
 250         [RS_COLUMN_SISO_ANT_A] = {
 251                 .mode = RS_SISO,
 252                 .ant = ANT_A,
 253                 .next_columns = {
 254                         RS_COLUMN_SISO_ANT_B,
 255                         RS_COLUMN_MIMO2,
 256                         RS_COLUMN_SISO_ANT_A_SGI,
 257                         RS_COLUMN_LEGACY_ANT_A,
 258                         RS_COLUMN_LEGACY_ANT_B,
 259                         RS_COLUMN_INVALID,
 260                         RS_COLUMN_INVALID,
 261                 },
 262                 .checks = {
 263                         rs_siso_allow,
 264                         rs_ant_allow,
 265                 },
 266         },
 267         [RS_COLUMN_SISO_ANT_B] = {
 268                 .mode = RS_SISO,
 269                 .ant = ANT_B,
 270                 .next_columns = {
 271                         RS_COLUMN_SISO_ANT_A,
 272                         RS_COLUMN_MIMO2,
 273                         RS_COLUMN_SISO_ANT_B_SGI,
 274                         RS_COLUMN_LEGACY_ANT_A,
 275                         RS_COLUMN_LEGACY_ANT_B,
 276                         RS_COLUMN_INVALID,
 277                         RS_COLUMN_INVALID,
 278                 },
 279                 .checks = {
 280                         rs_siso_allow,
 281                         rs_ant_allow,
 282                 },
 283         },
 284         [RS_COLUMN_SISO_ANT_A_SGI] = {
 285                 .mode = RS_SISO,
 286                 .ant = ANT_A,
 287                 .sgi = true,
 288                 .next_columns = {
 289                         RS_COLUMN_SISO_ANT_B_SGI,
 290                         RS_COLUMN_MIMO2_SGI,
 291                         RS_COLUMN_SISO_ANT_A,
 292                         RS_COLUMN_LEGACY_ANT_A,
 293                         RS_COLUMN_LEGACY_ANT_B,
 294                         RS_COLUMN_INVALID,
 295                         RS_COLUMN_INVALID,
 296                 },
 297                 .checks = {
 298                         rs_siso_allow,
 299                         rs_ant_allow,
 300                         rs_sgi_allow,
 301                 },
 302         },
 303         [RS_COLUMN_SISO_ANT_B_SGI] = {
 304                 .mode = RS_SISO,
 305                 .ant = ANT_B,
 306                 .sgi = true,
 307                 .next_columns = {
 308                         RS_COLUMN_SISO_ANT_A_SGI,
 309                         RS_COLUMN_MIMO2_SGI,
 310                         RS_COLUMN_SISO_ANT_B,
 311                         RS_COLUMN_LEGACY_ANT_A,
 312                         RS_COLUMN_LEGACY_ANT_B,
 313                         RS_COLUMN_INVALID,
 314                         RS_COLUMN_INVALID,
 315                 },
 316                 .checks = {
 317                         rs_siso_allow,
 318                         rs_ant_allow,
 319                         rs_sgi_allow,
 320                 },
 321         },
 322         [RS_COLUMN_MIMO2] = {
 323                 .mode = RS_MIMO2,
 324                 .ant = ANT_AB,
 325                 .next_columns = {
 326                         RS_COLUMN_SISO_ANT_A,
 327                         RS_COLUMN_MIMO2_SGI,
 328                         RS_COLUMN_LEGACY_ANT_A,
 329                         RS_COLUMN_LEGACY_ANT_B,
 330                         RS_COLUMN_INVALID,
 331                         RS_COLUMN_INVALID,
 332                         RS_COLUMN_INVALID,
 333                 },
 334                 .checks = {
 335                         rs_mimo_allow,
 336                 },
 337         },
 338         [RS_COLUMN_MIMO2_SGI] = {
 339                 .mode = RS_MIMO2,
 340                 .ant = ANT_AB,
 341                 .sgi = true,
 342                 .next_columns = {
 343                         RS_COLUMN_SISO_ANT_A_SGI,
 344                         RS_COLUMN_MIMO2,
 345                         RS_COLUMN_LEGACY_ANT_A,
 346                         RS_COLUMN_LEGACY_ANT_B,
 347                         RS_COLUMN_INVALID,
 348                         RS_COLUMN_INVALID,
 349                         RS_COLUMN_INVALID,
 350                 },
 351                 .checks = {
 352                         rs_mimo_allow,
 353                         rs_sgi_allow,
 354                 },
 355         },
 356 };
 357
 358 static inline u8 rs_extract_rate(u32 rate_n_flags)
 359 {
 360         /* also works for HT because bits 7:6 are zero there */
 361         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 362 }
 363
 364 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 365 {
 366         int idx = 0;
 367
 368         if (rate_n_flags & RATE_MCS_HT_MSK) {
 369                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 370                 idx += IWL_RATE_MCS_0_INDEX;
 371
 372                 /* skip 9M not supported in HT*/
 373                 if (idx >= IWL_RATE_9M_INDEX)
 374                         idx += 1;
 375                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 376                         return idx;
 377         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 378                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 379                 idx += IWL_RATE_MCS_0_INDEX;
 380
 381                 /* skip 9M not supported in VHT*/
 382                 if (idx >= IWL_RATE_9M_INDEX)
 383                         idx++;
 384                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 385                         return idx;
 386         } else {
 387                 /* legacy rate format, search for match in table */
 388
 389                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 390                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 391                         if (iwl_rates[idx].plcp == legacy_rate)
 392                                 return idx;
 393         }
 394
 395         return IWL_RATE_INVALID;
 396 }
 397
 398 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 399                                   struct ieee80211_sta *sta,
 400                                   struct iwl_lq_sta *lq_sta,
 401                                   int tid);
 402 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 403                            struct ieee80211_sta *sta,
 404                            struct iwl_lq_sta *lq_sta,
 405                            const struct rs_rate *initial_rate);
 406 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 407
 408 /**
 409  * The following tables contain the expected throughput metrics for all rates
 410  *
 411  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 412  *
 413  * where invalid entries are zeros.
 414  *
 415  * CCK rates are only valid in legacy table and will only be used in G
 416  * (2.4 GHz) band.
 417  */
 418
 419 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 420         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 421 };
 422
 423 /* Expected TpT tables. 4 indexes:
 424  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 425  */
 426 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 427         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 428         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 429         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 430         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 431 };
 432
 433 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 434         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 435         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 436         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 437         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 438 };
 439
 440 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 441         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 442         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 443         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 444         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 445 };
 446
 447 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 448         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 449         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 450         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 451         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 452 };
 453
 454 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 455         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 456         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 457         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 458         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 459 };
 460
 461 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 462         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 463         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 464         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 465         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 466 };
 467
 468 /* mbps, mcs */
 469 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 470         {  "1", "BPSK DSSS"},
 471         {  "2", "QPSK DSSS"},
 472         {"5.5", "BPSK CCK"},
 473         { "11", "QPSK CCK"},
 474         {  "6", "BPSK 1/2"},
 475         {  "9", "BPSK 1/2"},
 476         { "12", "QPSK 1/2"},
 477         { "18", "QPSK 3/4"},
 478         { "24", "16QAM 1/2"},
 479         { "36", "16QAM 3/4"},
 480         { "48", "64QAM 2/3"},
 481         { "54", "64QAM 3/4"},
 482         { "60", "64QAM 5/6"},
 483 };
 484
 485 #define MCS_INDEX_PER_STREAM    (8)
 486
 487 static const char *rs_pretty_ant(u8 ant)
 488 {
 489         static const char * const ant_name[] = {
 490                 [ANT_NONE] = "None",
 491                 [ANT_A]    = "A",
 492                 [ANT_B]    = "B",
 493                 [ANT_AB]   = "AB",
 494                 [ANT_C]    = "C",
 495                 [ANT_AC]   = "AC",
 496                 [ANT_BC]   = "BC",
 497                 [ANT_ABC]  = "ABC",
 498         };
 499
 500         if (ant > ANT_ABC)
 501                 return "UNKNOWN";
 502
 503         return ant_name[ant];
 504 }
 505
 506 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 507 {
 508         static const char * const lq_types[] = {
 509                 [LQ_NONE] = "NONE",
 510                 [LQ_LEGACY_A] = "LEGACY_A",
 511                 [LQ_LEGACY_G] = "LEGACY_G",
 512                 [LQ_HT_SISO] = "HT SISO",
 513                 [LQ_HT_MIMO2] = "HT MIMO",
 514                 [LQ_VHT_SISO] = "VHT SISO",
 515                 [LQ_VHT_MIMO2] = "VHT MIMO",
 516         };
 517
 518         if (type < LQ_NONE || type >= LQ_MAX)
 519                 return "UNKNOWN";
 520
 521         return lq_types[type];
 522 }
 523
 524 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 525                                 const char *prefix)
 526 {
 527         IWL_DEBUG_RATE(mvm,
 528                        "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
 529                        prefix, rs_pretty_lq_type(rate->type),
 530                        rate->index, rs_pretty_ant(rate->ant),
 531                        rate->bw, rate->sgi, rate->ldpc, rate->stbc);
 532 }
 533
 534 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 535 {
 536         window->data = 0;
 537         window->success_counter = 0;
 538         window->success_ratio = IWL_INVALID_VALUE;
 539         window->counter = 0;
 540         window->average_tpt = IWL_INVALID_VALUE;
 541 }
 542
 543 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 544                                             struct iwl_scale_tbl_info *tbl)
 545 {
 546         int i;
 547
 548         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 549         for (i = 0; i < IWL_RATE_COUNT; i++)
 550                 rs_rate_scale_clear_window(&tbl->win[i]);
 551
 552         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 553                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 554 }
 555
 556 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 557 {
 558         return (ant_type & valid_antenna) == ant_type;
 559 }
 560
 561 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 562                                       struct iwl_lq_sta *lq_data, u8 tid,
 563                                       struct ieee80211_sta *sta)
 564 {
 565         int ret = -EAGAIN;
 566
 567         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 568                      sta->addr, tid);
 569         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 570         if (ret == -EAGAIN) {
 571                 /*
 572                  * driver and mac80211 is out of sync
 573                  * this might be cause by reloading firmware
 574                  * stop the tx ba session here
 575                  */
 576                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 577                         tid);
 578                 ieee80211_stop_tx_ba_session(sta, tid);
 579         }
 580         return ret;
 581 }
 582
 583 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 584                               struct iwl_lq_sta *lq_data,
 585                               struct ieee80211_sta *sta)
 586 {
 587         if (tid < IWL_MAX_TID_COUNT)
 588                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 589         else
 590                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 591                         tid, IWL_MAX_TID_COUNT);
 592 }
 593
 594 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 595 {
 596         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 597                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 598                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 599 }
 600
 601 /*
 602  * Static function to get the expected throughput from an iwl_scale_tbl_info
 603  * that wraps a NULL pointer check
 604  */
 605 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 606 {
 607         if (tbl->expected_tpt)
 608                 return tbl->expected_tpt[rs_index];
 609         return 0;
 610 }
 611
 612 /**
 613  * rs_collect_tx_data - Update the success/failure sliding window
 614  *
 615  * We keep a sliding window of the last 62 packets transmitted
 616  * at this rate.  window->data contains the bitmask of successful
 617  * packets.
 618  */
 619 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
 620                                struct iwl_scale_tbl_info *tbl,
 621                                int scale_index, int attempts, int successes,
 622                                struct iwl_rate_scale_data *window)
 623 {
 624         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 625         s32 fail_count, tpt;
 626
 627         /* Get expected throughput */
 628         tpt = get_expected_tpt(tbl, scale_index);
 629
 630         /*
 631          * Keep track of only the latest 62 tx frame attempts in this rate's
 632          * history window; anything older isn't really relevant any more.
 633          * If we have filled up the sliding window, drop the oldest attempt;
 634          * if the oldest attempt (highest bit in bitmap) shows "success",
 635          * subtract "1" from the success counter (this is the main reason
 636          * we keep these bitmaps!).
 637          */
 638         while (attempts > 0) {
 639                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 640                         /* remove earliest */
 641                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 642
 643                         if (window->data & mask) {
 644                                 window->data &= ~mask;
 645                                 window->success_counter--;
 646                         }
 647                 }
 648
 649                 /* Increment frames-attempted counter */
 650                 window->counter++;
 651
 652                 /* Shift bitmap by one frame to throw away oldest history */
 653                 window->data <<= 1;
 654
 655                 /* Mark the most recent #successes attempts as successful */
 656                 if (successes > 0) {
 657                         window->success_counter++;
 658                         window->data |= 0x1;
 659                         successes--;
 660                 }
 661
 662                 attempts--;
 663         }
 664
 665         /* Calculate current success ratio, avoid divide-by-0! */
 666         if (window->counter > 0)
 667                 window->success_ratio = 128 * (100 * window->success_counter)
 668                                         / window->counter;
 669         else
 670                 window->success_ratio = IWL_INVALID_VALUE;
 671
 672         fail_count = window->counter - window->success_counter;
 673
 674         /* Calculate average throughput, if we have enough history. */
 675         if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
 676             (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
 677                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 678         else
 679                 window->average_tpt = IWL_INVALID_VALUE;
 680
 681         return 0;
 682 }
 683
 684 static int rs_collect_tx_data(struct iwl_mvm *mvm,
 685                               struct iwl_lq_sta *lq_sta,
 686                               struct iwl_scale_tbl_info *tbl,
 687                               int scale_index, int attempts, int successes,
 688                               u8 reduced_txp)
 689 {
 690         struct iwl_rate_scale_data *window = NULL;
 691         int ret;
 692
 693         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 694                 return -EINVAL;
 695
 696         if (tbl->column != RS_COLUMN_INVALID) {
 697                 struct lq_sta_pers *pers = &lq_sta->pers;
 698
 699                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 700                 pers->tx_stats[tbl->column][scale_index].success += successes;
 701         }
 702
 703         /* Select window for current tx bit rate */
 704         window = &(tbl->win[scale_index]);
 705
 706         ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 707                                   window);
 708         if (ret)
 709                 return ret;
 710
 711         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 712                 return -EINVAL;
 713
 714         window = &tbl->tpc_win[reduced_txp];
 715         return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 716                                    window);
 717 }
 718
 719 /* Convert rs_rate object into ucode rate bitmask */
 720 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 721                                   struct rs_rate *rate)
 722 {
 723         u32 ucode_rate = 0;
 724         int index = rate->index;
 725
 726         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 727                          RATE_MCS_ANT_ABC_MSK);
 728
 729         if (is_legacy(rate)) {
 730                 ucode_rate |= iwl_rates[index].plcp;
 731                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 732                         ucode_rate |= RATE_MCS_CCK_MSK;
 733                 return ucode_rate;
 734         }
 735
 736         if (is_ht(rate)) {
 737                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 738                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 739                         index = IWL_LAST_HT_RATE;
 740                 }
 741                 ucode_rate |= RATE_MCS_HT_MSK;
 742
 743                 if (is_ht_siso(rate))
 744                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 745                 else if (is_ht_mimo2(rate))
 746                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 747                 else
 748                         WARN_ON_ONCE(1);
 749         } else if (is_vht(rate)) {
 750                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 751                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 752                         index = IWL_LAST_VHT_RATE;
 753                 }
 754                 ucode_rate |= RATE_MCS_VHT_MSK;
 755                 if (is_vht_siso(rate))
 756                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 757                 else if (is_vht_mimo2(rate))
 758                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 759                 else
 760                         WARN_ON_ONCE(1);
 761
 762         } else {
 763                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 764         }
 765
 766         if (is_siso(rate) && rate->stbc) {
 767                 /* To enable STBC we need to set both a flag and ANT_AB */
 768                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 769                 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
 770         }
 771
 772         ucode_rate |= rate->bw;
 773         if (rate->sgi)
 774                 ucode_rate |= RATE_MCS_SGI_MSK;
 775         if (rate->ldpc)
 776                 ucode_rate |= RATE_MCS_LDPC_MSK;
 777
 778         return ucode_rate;
 779 }
 780
 781 /* Convert a ucode rate into an rs_rate object */
 782 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 783                                    enum ieee80211_band band,
 784                                    struct rs_rate *rate)
 785 {
 786         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 787         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 788         u8 nss;
 789
 790         memset(rate, 0, sizeof(*rate));
 791         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 792
 793         if (rate->index == IWL_RATE_INVALID)
 794                 return -EINVAL;
 795
 796         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 797
 798         /* Legacy */
 799         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 800             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 801                 if (num_of_ant == 1) {
 802                         if (band == IEEE80211_BAND_5GHZ)
 803                                 rate->type = LQ_LEGACY_A;
 804                         else
 805                                 rate->type = LQ_LEGACY_G;
 806                 }
 807
 808                 return 0;
 809         }
 810
 811         /* HT or VHT */
 812         if (ucode_rate & RATE_MCS_SGI_MSK)
 813                 rate->sgi = true;
 814         if (ucode_rate & RATE_MCS_LDPC_MSK)
 815                 rate->ldpc = true;
 816         if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
 817                 rate->stbc = true;
 818         if (ucode_rate & RATE_MCS_BF_MSK)
 819                 rate->bfer = true;
 820
 821         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 822
 823         if (ucode_rate & RATE_MCS_HT_MSK) {
 824                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 825                        RATE_HT_MCS_NSS_POS) + 1;
 826
 827                 if (nss == 1) {
 828                         rate->type = LQ_HT_SISO;
 829                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 830                                   "stbc %d bfer %d",
 831                                   rate->stbc, rate->bfer);
 832                 } else if (nss == 2) {
 833                         rate->type = LQ_HT_MIMO2;
 834                         WARN_ON_ONCE(num_of_ant != 2);
 835                 } else {
 836                         WARN_ON_ONCE(1);
 837                 }
 838         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 839                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 840                        RATE_VHT_MCS_NSS_POS) + 1;
 841
 842                 if (nss == 1) {
 843                         rate->type = LQ_VHT_SISO;
 844                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 845                                   "stbc %d bfer %d",
 846                                   rate->stbc, rate->bfer);
 847                 } else if (nss == 2) {
 848                         rate->type = LQ_VHT_MIMO2;
 849                         WARN_ON_ONCE(num_of_ant != 2);
 850                 } else {
 851                         WARN_ON_ONCE(1);
 852                 }
 853         }
 854
 855         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
 856         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 857                      !is_vht(rate));
 858
 859         return 0;
 860 }
 861
 862 /* switch to another antenna/antennas and return 1 */
 863 /* if no other valid antenna found, return 0 */
 864 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 865 {
 866         u8 new_ant_type;
 867
 868         if (!rate->ant || rate->ant > ANT_ABC)
 869                 return 0;
 870
 871         if (!rs_is_valid_ant(valid_ant, rate->ant))
 872                 return 0;
 873
 874         new_ant_type = ant_toggle_lookup[rate->ant];
 875
 876         while ((new_ant_type != rate->ant) &&
 877                !rs_is_valid_ant(valid_ant, new_ant_type))
 878                 new_ant_type = ant_toggle_lookup[new_ant_type];
 879
 880         if (new_ant_type == rate->ant)
 881                 return 0;
 882
 883         rate->ant = new_ant_type;
 884
 885         return 1;
 886 }
 887
 888 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 889                                   struct rs_rate *rate)
 890 {
 891         if (is_legacy(rate))
 892                 return lq_sta->active_legacy_rate;
 893         else if (is_siso(rate))
 894                 return lq_sta->active_siso_rate;
 895         else if (is_mimo2(rate))
 896                 return lq_sta->active_mimo2_rate;
 897
 898         WARN_ON_ONCE(1);
 899         return 0;
 900 }
 901
 902 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 903                                 int rate_type)
 904 {
 905         u8 high = IWL_RATE_INVALID;
 906         u8 low = IWL_RATE_INVALID;
 907
 908         /* 802.11A or ht walks to the next literal adjacent rate in
 909          * the rate table */
 910         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 911                 int i;
 912                 u32 mask;
 913
 914                 /* Find the previous rate that is in the rate mask */
 915                 i = index - 1;
 916                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 917                         if (rate_mask & mask) {
 918                                 low = i;
 919                                 break;
 920                         }
 921                 }
 922
 923                 /* Find the next rate that is in the rate mask */
 924                 i = index + 1;
 925                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 926                         if (rate_mask & mask) {
 927                                 high = i;
 928                                 break;
 929                         }
 930                 }
 931
 932                 return (high << 8) | low;
 933         }
 934
 935         low = index;
 936         while (low != IWL_RATE_INVALID) {
 937                 low = iwl_rates[low].prev_rs;
 938                 if (low == IWL_RATE_INVALID)
 939                         break;
 940                 if (rate_mask & (1 << low))
 941                         break;
 942         }
 943
 944         high = index;
 945         while (high != IWL_RATE_INVALID) {
 946                 high = iwl_rates[high].next_rs;
 947                 if (high == IWL_RATE_INVALID)
 948                         break;
 949                 if (rate_mask & (1 << high))
 950                         break;
 951         }
 952
 953         return (high << 8) | low;
 954 }
 955
 956 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
 957                                      struct rs_rate *rate)
 958 {
 959         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
 960 }
 961
 962 /* Get the next supported lower rate in the current column.
 963  * Return true if bottom rate in the current column was reached
 964  */
 965 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
 966                                         struct rs_rate *rate)
 967 {
 968         u8 low;
 969         u16 high_low;
 970         u16 rate_mask;
 971         struct iwl_mvm *mvm = lq_sta->pers.drv;
 972
 973         rate_mask = rs_get_supported_rates(lq_sta, rate);
 974         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
 975                                         rate->type);
 976         low = high_low & 0xff;
 977
 978         /* Bottom rate of column reached */
 979         if (low == IWL_RATE_INVALID)
 980                 return true;
 981
 982         rate->index = low;
 983         return false;
 984 }
 985
 986 /* Get the next rate to use following a column downgrade */
 987 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
 988                                           struct rs_rate *rate)
 989 {
 990         struct iwl_mvm *mvm = lq_sta->pers.drv;
 991
 992         if (is_legacy(rate)) {
 993                 /* No column to downgrade from Legacy */
 994                 return;
 995         } else if (is_siso(rate)) {
 996                 /* Downgrade to Legacy if we were in SISO */
 997                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 998                         rate->type = LQ_LEGACY_A;
 999                 else
1000                         rate->type = LQ_LEGACY_G;
1001
1002                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1003
1004                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1005                              rate->index > IWL_RATE_MCS_9_INDEX);
1006
1007                 rate->index = rs_ht_to_legacy[rate->index];
1008                 rate->ldpc = false;
1009         } else {
1010                 /* Downgrade to SISO with same MCS if in MIMO  */
1011                 rate->type = is_vht_mimo2(rate) ?
1012                         LQ_VHT_SISO : LQ_HT_SISO;
1013         }
1014
1015         if (num_of_ant(rate->ant) > 1)
1016                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1017
1018         /* Relevant in both switching to SISO or Legacy */
1019         rate->sgi = false;
1020
1021         if (!rs_rate_supported(lq_sta, rate))
1022                 rs_get_lower_rate_in_column(lq_sta, rate);
1023 }
1024
1025 /* Check if both rates are identical
1026  * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1027  * with a rate indicating STBC/BFER and ANT_AB.
1028  */
1029 static inline bool rs_rate_equal(struct rs_rate *a,
1030                                  struct rs_rate *b,
1031                                  bool allow_ant_mismatch)
1032
1033 {
1034         bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1035                 (a->bfer == b->bfer);
1036
1037         if (allow_ant_mismatch) {
1038                 if (a->stbc || a->bfer) {
1039                         WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1040                                   a->stbc, a->bfer, a->ant);
1041                         ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1042                 } else if (b->stbc || b->bfer) {
1043                         WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1044                                   b->stbc, b->bfer, b->ant);
1045                         ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1046                 }
1047         }
1048
1049         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1050                 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1051 }
1052
1053 /* Check if both rates share the same column */
1054 static inline bool rs_rate_column_match(struct rs_rate *a,
1055                                         struct rs_rate *b)
1056 {
1057         bool ant_match;
1058
1059         if (a->stbc || a->bfer)
1060                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1061         else
1062                 ant_match = (a->ant == b->ant);
1063
1064         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1065                 && ant_match;
1066 }
1067
1068 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1069 {
1070         if (is_legacy(rate)) {
1071                 if (rate->ant == ANT_A)
1072                         return RS_COLUMN_LEGACY_ANT_A;
1073
1074                 if (rate->ant == ANT_B)
1075                         return RS_COLUMN_LEGACY_ANT_B;
1076
1077                 goto err;
1078         }
1079
1080         if (is_siso(rate)) {
1081                 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1082                         return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1083                                 RS_COLUMN_SISO_ANT_A;
1084
1085                 if (rate->ant == ANT_B)
1086                         return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1087                                 RS_COLUMN_SISO_ANT_B;
1088
1089                 goto err;
1090         }
1091
1092         if (is_mimo(rate))
1093                 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1094
1095 err:
1096         return RS_COLUMN_INVALID;
1097 }
1098
1099 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1100 {
1101         u8 tid = IWL_MAX_TID_COUNT;
1102
1103         if (ieee80211_is_data_qos(hdr->frame_control)) {
1104                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1105                 tid = qc[0] & 0xf;
1106         }
1107
1108         if (unlikely(tid > IWL_MAX_TID_COUNT))
1109                 tid = IWL_MAX_TID_COUNT;
1110
1111         return tid;
1112 }
1113
1114 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1115                           int tid, struct ieee80211_tx_info *info)
1116 {
1117         int legacy_success;
1118         int retries;
1119         int i;
1120         struct iwl_lq_cmd *table;
1121         u32 lq_hwrate;
1122         struct rs_rate lq_rate, tx_resp_rate;
1123         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1124         u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1125         u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1126         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1127         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1128         bool allow_ant_mismatch = mvm->fw->ucode_capa.api[0] &
1129                 IWL_UCODE_TLV_API_LQ_SS_PARAMS;
1130
1131         /* Treat uninitialized rate scaling data same as non-existing. */
1132         if (!lq_sta) {
1133                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1134                 return;
1135         } else if (!lq_sta->pers.drv) {
1136                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1137                 return;
1138         }
1139
1140         /* This packet was aggregated but doesn't carry status info */
1141         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1142             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1143                 return;
1144
1145         rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1146
1147 #ifdef CONFIG_MAC80211_DEBUGFS
1148         /* Disable last tx check if we are debugging with fixed rate but
1149          * update tx stats */
1150         if (lq_sta->pers.dbg_fixed_rate) {
1151                 int index = tx_resp_rate.index;
1152                 enum rs_column column;
1153                 int attempts, success;
1154
1155                 column = rs_get_column_from_rate(&tx_resp_rate);
1156                 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1157                               "Can't map rate 0x%x to column",
1158                               tx_resp_hwrate))
1159                         return;
1160
1161                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1162                         attempts = info->status.ampdu_len;
1163                         success = info->status.ampdu_ack_len;
1164                 } else {
1165                         attempts = info->status.rates[0].count;
1166                         success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1167                 }
1168
1169                 lq_sta->pers.tx_stats[column][index].total += attempts;
1170                 lq_sta->pers.tx_stats[column][index].success += success;
1171
1172                 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1173                                tx_resp_hwrate, success, attempts);
1174                 return;
1175         }
1176 #endif
1177
1178         if (time_after(jiffies,
1179                        (unsigned long)(lq_sta->last_tx +
1180                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1181                 int t;
1182
1183                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1184                 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1185                         ieee80211_stop_tx_ba_session(sta, t);
1186
1187                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1188                 return;
1189         }
1190         lq_sta->last_tx = jiffies;
1191
1192         /* Ignore this Tx frame response if its initial rate doesn't match
1193          * that of latest Link Quality command.  There may be stragglers
1194          * from a previous Link Quality command, but we're no longer interested
1195          * in those; they're either from the "active" mode while we're trying
1196          * to check "search" mode, or a prior "search" mode after we've moved
1197          * to a new "search" mode (which might become the new "active" mode).
1198          */
1199         table = &lq_sta->lq;
1200         lq_hwrate = le32_to_cpu(table->rs_table[0]);
1201         rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1202
1203         /* Here we actually compare this rate to the latest LQ command */
1204         if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1205                 IWL_DEBUG_RATE(mvm,
1206                                "initial tx resp rate 0x%x does not match 0x%x\n",
1207                                tx_resp_hwrate, lq_hwrate);
1208
1209                 /*
1210                  * Since rates mis-match, the last LQ command may have failed.
1211                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1212                  * ... driver.
1213                  */
1214                 lq_sta->missed_rate_counter++;
1215                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1216                         lq_sta->missed_rate_counter = 0;
1217                         IWL_DEBUG_RATE(mvm,
1218                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1219                                        lq_sta->rs_state);
1220                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1221                 }
1222                 /* Regardless, ignore this status info for outdated rate */
1223                 return;
1224         } else
1225                 /* Rate did match, so reset the missed_rate_counter */
1226                 lq_sta->missed_rate_counter = 0;
1227
1228         if (!lq_sta->search_better_tbl) {
1229                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1230                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1231         } else {
1232                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1233                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1234         }
1235
1236         if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1237                 IWL_DEBUG_RATE(mvm,
1238                                "Neither active nor search matches tx rate\n");
1239                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1240                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1241                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1242                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1243                 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1244
1245                 /*
1246                  * no matching table found, let's by-pass the data collection
1247                  * and continue to perform rate scale to find the rate table
1248                  */
1249                 rs_stay_in_table(lq_sta, true);
1250                 goto done;
1251         }
1252
1253         /*
1254          * Updating the frame history depends on whether packets were
1255          * aggregated.
1256          *
1257          * For aggregation, all packets were transmitted at the same rate, the
1258          * first index into rate scale table.
1259          */
1260         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1261                 /* ampdu_ack_len = 0 marks no BA was received. In this case
1262                  * treat it as a single frame loss as we don't want the success
1263                  * ratio to dip too quickly because a BA wasn't received
1264                  */
1265                 if (info->status.ampdu_ack_len == 0)
1266                         info->status.ampdu_len = 1;
1267
1268                 rs_collect_tx_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1269                                    info->status.ampdu_len,
1270                                    info->status.ampdu_ack_len,
1271                                    reduced_txp);
1272
1273                 /* Update success/fail counts if not searching for new mode */
1274                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1275                         lq_sta->total_success += info->status.ampdu_ack_len;
1276                         lq_sta->total_failed += (info->status.ampdu_len -
1277                                         info->status.ampdu_ack_len);
1278                 }
1279         } else {
1280                 /* For legacy, update frame history with for each Tx retry. */
1281                 retries = info->status.rates[0].count - 1;
1282                 /* HW doesn't send more than 15 retries */
1283                 retries = min(retries, 15);
1284
1285                 /* The last transmission may have been successful */
1286                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1287                 /* Collect data for each rate used during failed TX attempts */
1288                 for (i = 0; i <= retries; ++i) {
1289                         lq_hwrate = le32_to_cpu(table->rs_table[i]);
1290                         rs_rate_from_ucode_rate(lq_hwrate, info->band,
1291                                                 &lq_rate);
1292                         /*
1293                          * Only collect stats if retried rate is in the same RS
1294                          * table as active/search.
1295                          */
1296                         if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1297                                 tmp_tbl = curr_tbl;
1298                         else if (rs_rate_column_match(&lq_rate,
1299                                                       &other_tbl->rate))
1300                                 tmp_tbl = other_tbl;
1301                         else
1302                                 continue;
1303
1304                         rs_collect_tx_data(mvm, lq_sta, tmp_tbl, lq_rate.index,
1305                                            1, i < retries ? 0 : legacy_success,
1306                                            reduced_txp);
1307                 }
1308
1309                 /* Update success/fail counts if not searching for new mode */
1310                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1311                         lq_sta->total_success += legacy_success;
1312                         lq_sta->total_failed += retries + (1 - legacy_success);
1313                 }
1314         }
1315         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1316         lq_sta->last_rate_n_flags = lq_hwrate;
1317         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1318 done:
1319         /* See if there's a better rate or modulation mode to try. */
1320         if (sta->supp_rates[info->band])
1321                 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1322 }
1323
1324 /*
1325  * mac80211 sends us Tx status
1326  */
1327 static void rs_mac80211_tx_status(void *mvm_r,
1328                                   struct ieee80211_supported_band *sband,
1329                                   struct ieee80211_sta *sta, void *priv_sta,
1330                                   struct sk_buff *skb)
1331 {
1332         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1333         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1334         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1335         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1336
1337         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1338                 return;
1339
1340         if (!ieee80211_is_data(hdr->frame_control) ||
1341             info->flags & IEEE80211_TX_CTL_NO_ACK)
1342                 return;
1343
1344         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1345 }
1346
1347 /*
1348  * Begin a period of staying with a selected modulation mode.
1349  * Set "stay_in_tbl" flag to prevent any mode switches.
1350  * Set frame tx success limits according to legacy vs. high-throughput,
1351  * and reset overall (spanning all rates) tx success history statistics.
1352  * These control how long we stay using same modulation mode before
1353  * searching for a new mode.
1354  */
1355 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1356                                  struct iwl_lq_sta *lq_sta)
1357 {
1358         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1359         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1360         if (is_legacy) {
1361                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1362                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1363                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1364         } else {
1365                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1366                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1367                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1368         }
1369         lq_sta->table_count = 0;
1370         lq_sta->total_failed = 0;
1371         lq_sta->total_success = 0;
1372         lq_sta->flush_timer = jiffies;
1373         lq_sta->visited_columns = 0;
1374 }
1375
1376 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1377 {
1378         if (rate_mask)
1379                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1380         return IWL_RATE_INVALID;
1381 }
1382
1383 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1384                                    const struct rs_tx_column *column)
1385 {
1386         switch (column->mode) {
1387         case RS_LEGACY:
1388                 return lq_sta->max_legacy_rate_idx;
1389         case RS_SISO:
1390                 return lq_sta->max_siso_rate_idx;
1391         case RS_MIMO2:
1392                 return lq_sta->max_mimo2_rate_idx;
1393         default:
1394                 WARN_ON_ONCE(1);
1395         }
1396
1397         return lq_sta->max_legacy_rate_idx;
1398 }
1399
1400 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1401                                             const struct rs_tx_column *column,
1402                                             u32 bw)
1403 {
1404         /* Used to choose among HT tables */
1405         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1406
1407         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1408                          column->mode != RS_SISO &&
1409                          column->mode != RS_MIMO2))
1410                 return expected_tpt_legacy;
1411
1412         /* Legacy rates have only one table */
1413         if (column->mode == RS_LEGACY)
1414                 return expected_tpt_legacy;
1415
1416         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1417         /* Choose among many HT tables depending on number of streams
1418          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1419          * status */
1420         if (column->mode == RS_SISO) {
1421                 switch (bw) {
1422                 case RATE_MCS_CHAN_WIDTH_20:
1423                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1424                         break;
1425                 case RATE_MCS_CHAN_WIDTH_40:
1426                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1427                         break;
1428                 case RATE_MCS_CHAN_WIDTH_80:
1429                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1430                         break;
1431                 default:
1432                         WARN_ON_ONCE(1);
1433                 }
1434         } else if (column->mode == RS_MIMO2) {
1435                 switch (bw) {
1436                 case RATE_MCS_CHAN_WIDTH_20:
1437                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1438                         break;
1439                 case RATE_MCS_CHAN_WIDTH_40:
1440                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1441                         break;
1442                 case RATE_MCS_CHAN_WIDTH_80:
1443                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1444                         break;
1445                 default:
1446                         WARN_ON_ONCE(1);
1447                 }
1448         } else {
1449                 WARN_ON_ONCE(1);
1450         }
1451
1452         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1453                 return ht_tbl_pointer[0];
1454         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1455                 return ht_tbl_pointer[1];
1456         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1457                 return ht_tbl_pointer[2];
1458         else                                            /* AGG+SGI */
1459                 return ht_tbl_pointer[3];
1460 }
1461
1462 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1463                                       struct iwl_scale_tbl_info *tbl)
1464 {
1465         struct rs_rate *rate = &tbl->rate;
1466         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1467
1468         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1469 }
1470
1471 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1472                             struct iwl_lq_sta *lq_sta,
1473                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1474                             unsigned long rate_mask, s8 index)
1475 {
1476         struct iwl_scale_tbl_info *active_tbl =
1477             &(lq_sta->lq_info[lq_sta->active_tbl]);
1478         s32 success_ratio = active_tbl->win[index].success_ratio;
1479         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1480         const u16 *tpt_tbl = tbl->expected_tpt;
1481         u16 high_low;
1482         u32 target_tpt;
1483         int rate_idx;
1484
1485         if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) {
1486                 target_tpt = 100 * expected_current_tpt;
1487                 IWL_DEBUG_RATE(mvm,
1488                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1489                                success_ratio, target_tpt);
1490         } else {
1491                 target_tpt = lq_sta->last_tpt;
1492                 IWL_DEBUG_RATE(mvm,
1493                                "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1494                                success_ratio, target_tpt);
1495         }
1496
1497         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1498
1499         while (rate_idx != IWL_RATE_INVALID) {
1500                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1501                         break;
1502
1503                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1504                                                 tbl->rate.type);
1505
1506                 rate_idx = (high_low >> 8) & 0xff;
1507         }
1508
1509         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1510                        rate_idx, target_tpt,
1511                        rate_idx != IWL_RATE_INVALID ?
1512                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1513
1514         return rate_idx;
1515 }
1516
1517 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1518 {
1519         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1520                 return RATE_MCS_CHAN_WIDTH_80;
1521         else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1522                 return RATE_MCS_CHAN_WIDTH_40;
1523
1524         return RATE_MCS_CHAN_WIDTH_20;
1525 }
1526
1527 /*
1528  * Check whether we should continue using same modulation mode, or
1529  * begin search for a new mode, based on:
1530  * 1) # tx successes or failures while using this mode
1531  * 2) # times calling this function
1532  * 3) elapsed time in this mode (not used, for now)
1533  */
1534 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1535 {
1536         struct iwl_scale_tbl_info *tbl;
1537         int active_tbl;
1538         int flush_interval_passed = 0;
1539         struct iwl_mvm *mvm;
1540
1541         mvm = lq_sta->pers.drv;
1542         active_tbl = lq_sta->active_tbl;
1543
1544         tbl = &(lq_sta->lq_info[active_tbl]);
1545
1546         /* If we've been disallowing search, see if we should now allow it */
1547         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1548                 /* Elapsed time using current modulation mode */
1549                 if (lq_sta->flush_timer)
1550                         flush_interval_passed =
1551                                 time_after(jiffies,
1552                                            (unsigned long)(lq_sta->flush_timer +
1553                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1554
1555                 /*
1556                  * Check if we should allow search for new modulation mode.
1557                  * If many frames have failed or succeeded, or we've used
1558                  * this same modulation for a long time, allow search, and
1559                  * reset history stats that keep track of whether we should
1560                  * allow a new search.  Also (below) reset all bitmaps and
1561                  * stats in active history.
1562                  */
1563                 if (force_search ||
1564                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1565                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1566                     ((!lq_sta->search_better_tbl) &&
1567                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1568                         IWL_DEBUG_RATE(mvm,
1569                                        "LQ: stay is expired %d %d %d\n",
1570                                      lq_sta->total_failed,
1571                                      lq_sta->total_success,
1572                                      flush_interval_passed);
1573
1574                         /* Allow search for new mode */
1575                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1576                         IWL_DEBUG_RATE(mvm,
1577                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1578                         lq_sta->total_failed = 0;
1579                         lq_sta->total_success = 0;
1580                         lq_sta->flush_timer = 0;
1581                         /* mark the current column as visited */
1582                         lq_sta->visited_columns = BIT(tbl->column);
1583                 /*
1584                  * Else if we've used this modulation mode enough repetitions
1585                  * (regardless of elapsed time or success/failure), reset
1586                  * history bitmaps and rate-specific stats for all rates in
1587                  * active table.
1588                  */
1589                 } else {
1590                         lq_sta->table_count++;
1591                         if (lq_sta->table_count >=
1592                             lq_sta->table_count_limit) {
1593                                 lq_sta->table_count = 0;
1594
1595                                 IWL_DEBUG_RATE(mvm,
1596                                                "LQ: stay in table clear win\n");
1597                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1598                         }
1599                 }
1600
1601                 /* If transitioning to allow "search", reset all history
1602                  * bitmaps and stats in active table (this will become the new
1603                  * "search" table). */
1604                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1605                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1606                 }
1607         }
1608 }
1609
1610 /*
1611  * setup rate table in uCode
1612  */
1613 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1614                                struct ieee80211_sta *sta,
1615                                struct iwl_lq_sta *lq_sta,
1616                                struct iwl_scale_tbl_info *tbl)
1617 {
1618         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1619         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1620 }
1621
1622 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1623                                          struct iwl_lq_sta *lq_sta,
1624                                          struct ieee80211_sta *sta,
1625                                          struct iwl_scale_tbl_info *tbl)
1626 {
1627         int i, j, max_rate;
1628         enum rs_column next_col_id;
1629         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1630         const struct rs_tx_column *next_col;
1631         allow_column_func_t allow_func;
1632         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1633         const u16 *expected_tpt_tbl;
1634         u16 tpt, max_expected_tpt;
1635
1636         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1637                 next_col_id = curr_col->next_columns[i];
1638
1639                 if (next_col_id == RS_COLUMN_INVALID)
1640                         continue;
1641
1642                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1643                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1644                                        next_col_id);
1645                         continue;
1646                 }
1647
1648                 next_col = &rs_tx_columns[next_col_id];
1649
1650                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1651                         IWL_DEBUG_RATE(mvm,
1652                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1653                                        next_col_id, valid_ants, next_col->ant);
1654                         continue;
1655                 }
1656
1657                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1658                         allow_func = next_col->checks[j];
1659                         if (allow_func && !allow_func(mvm, sta, tbl, next_col))
1660                                 break;
1661                 }
1662
1663                 if (j != MAX_COLUMN_CHECKS) {
1664                         IWL_DEBUG_RATE(mvm,
1665                                        "Skip column %d: not allowed (check %d failed)\n",
1666                                        next_col_id, j);
1667
1668                         continue;
1669                 }
1670
1671                 tpt = lq_sta->last_tpt / 100;
1672                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1673                                                      rs_bw_from_sta_bw(sta));
1674                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1675                         continue;
1676
1677                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1678                 if (max_rate == IWL_RATE_INVALID) {
1679                         IWL_DEBUG_RATE(mvm,
1680                                        "Skip column %d: no rate is allowed in this column\n",
1681                                        next_col_id);
1682                         continue;
1683                 }
1684
1685                 max_expected_tpt = expected_tpt_tbl[max_rate];
1686                 if (tpt >= max_expected_tpt) {
1687                         IWL_DEBUG_RATE(mvm,
1688                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1689                                        next_col_id, max_expected_tpt, tpt);
1690                         continue;
1691                 }
1692
1693                 IWL_DEBUG_RATE(mvm,
1694                                "Found potential column %d. Max expected %d current %d\n",
1695                                next_col_id, max_expected_tpt, tpt);
1696                 break;
1697         }
1698
1699         if (i == MAX_NEXT_COLUMNS)
1700                 return RS_COLUMN_INVALID;
1701
1702         return next_col_id;
1703 }
1704
1705 static int rs_switch_to_column(struct iwl_mvm *mvm,
1706                                struct iwl_lq_sta *lq_sta,
1707                                struct ieee80211_sta *sta,
1708                                enum rs_column col_id)
1709 {
1710         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1711         struct iwl_scale_tbl_info *search_tbl =
1712                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1713         struct rs_rate *rate = &search_tbl->rate;
1714         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1715         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1716         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1717                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1718         unsigned long rate_mask = 0;
1719         u32 rate_idx = 0;
1720
1721         memcpy(search_tbl, tbl, sz);
1722
1723         rate->sgi = column->sgi;
1724         rate->ant = column->ant;
1725
1726         if (column->mode == RS_LEGACY) {
1727                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1728                         rate->type = LQ_LEGACY_A;
1729                 else
1730                         rate->type = LQ_LEGACY_G;
1731
1732                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1733                 rate->ldpc = false;
1734                 rate_mask = lq_sta->active_legacy_rate;
1735         } else if (column->mode == RS_SISO) {
1736                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1737                 rate_mask = lq_sta->active_siso_rate;
1738         } else if (column->mode == RS_MIMO2) {
1739                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1740                 rate_mask = lq_sta->active_mimo2_rate;
1741         } else {
1742                 WARN_ON_ONCE("Bad column mode");
1743         }
1744
1745         if (column->mode != RS_LEGACY) {
1746                 rate->bw = rs_bw_from_sta_bw(sta);
1747                 rate->ldpc = lq_sta->ldpc;
1748         }
1749
1750         search_tbl->column = col_id;
1751         rs_set_expected_tpt_table(lq_sta, search_tbl);
1752
1753         lq_sta->visited_columns |= BIT(col_id);
1754
1755         /* Get the best matching rate if we're changing modes. e.g.
1756          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1757          */
1758         if (curr_column->mode != column->mode) {
1759                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1760                                             rate_mask, rate->index);
1761
1762                 if ((rate_idx == IWL_RATE_INVALID) ||
1763                     !(BIT(rate_idx) & rate_mask)) {
1764                         IWL_DEBUG_RATE(mvm,
1765                                        "can not switch with index %d"
1766                                        " rate mask %lx\n",
1767                                        rate_idx, rate_mask);
1768
1769                         goto err;
1770                 }
1771
1772                 rate->index = rate_idx;
1773         }
1774
1775         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1776                        col_id, rate->index);
1777
1778         return 0;
1779
1780 err:
1781         rate->type = LQ_NONE;
1782         return -1;
1783 }
1784
1785 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1786                                          struct iwl_scale_tbl_info *tbl,
1787                                          s32 sr, int low, int high,
1788                                          int current_tpt,
1789                                          int low_tpt, int high_tpt)
1790 {
1791         enum rs_action action = RS_ACTION_STAY;
1792
1793         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1794             (current_tpt == 0)) {
1795                 IWL_DEBUG_RATE(mvm,
1796                                "Decrease rate because of low SR\n");
1797                 return RS_ACTION_DOWNSCALE;
1798         }
1799
1800         if ((low_tpt == IWL_INVALID_VALUE) &&
1801             (high_tpt == IWL_INVALID_VALUE) &&
1802             (high != IWL_RATE_INVALID)) {
1803                 IWL_DEBUG_RATE(mvm,
1804                                "No data about high/low rates. Increase rate\n");
1805                 return RS_ACTION_UPSCALE;
1806         }
1807
1808         if ((high_tpt == IWL_INVALID_VALUE) &&
1809             (high != IWL_RATE_INVALID) &&
1810             (low_tpt != IWL_INVALID_VALUE) &&
1811             (low_tpt < current_tpt)) {
1812                 IWL_DEBUG_RATE(mvm,
1813                                "No data about high rate and low rate is worse. Increase rate\n");
1814                 return RS_ACTION_UPSCALE;
1815         }
1816
1817         if ((high_tpt != IWL_INVALID_VALUE) &&
1818             (high_tpt > current_tpt)) {
1819                 IWL_DEBUG_RATE(mvm,
1820                                "Higher rate is better. Increate rate\n");
1821                 return RS_ACTION_UPSCALE;
1822         }
1823
1824         if ((low_tpt != IWL_INVALID_VALUE) &&
1825             (high_tpt != IWL_INVALID_VALUE) &&
1826             (low_tpt < current_tpt) &&
1827             (high_tpt < current_tpt)) {
1828                 IWL_DEBUG_RATE(mvm,
1829                                "Both high and low are worse. Maintain rate\n");
1830                 return RS_ACTION_STAY;
1831         }
1832
1833         if ((low_tpt != IWL_INVALID_VALUE) &&
1834             (low_tpt > current_tpt)) {
1835                 IWL_DEBUG_RATE(mvm,
1836                                "Lower rate is better\n");
1837                 action = RS_ACTION_DOWNSCALE;
1838                 goto out;
1839         }
1840
1841         if ((low_tpt == IWL_INVALID_VALUE) &&
1842             (low != IWL_RATE_INVALID)) {
1843                 IWL_DEBUG_RATE(mvm,
1844                                "No data about lower rate\n");
1845                 action = RS_ACTION_DOWNSCALE;
1846                 goto out;
1847         }
1848
1849         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1850
1851 out:
1852         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1853                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1854                         IWL_DEBUG_RATE(mvm,
1855                                        "SR is above NO DECREASE. Avoid downscale\n");
1856                         action = RS_ACTION_STAY;
1857                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1858                         IWL_DEBUG_RATE(mvm,
1859                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1860                         action = RS_ACTION_STAY;
1861                 } else {
1862                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1863                 }
1864         }
1865
1866         return action;
1867 }
1868
1869 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1870                           struct iwl_lq_sta *lq_sta)
1871 {
1872         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1873          * supports STBC of at least 1*SS
1874          */
1875         if (!lq_sta->stbc_capable)
1876                 return false;
1877
1878         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1879                 return false;
1880
1881         return true;
1882 }
1883
1884 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1885                                 int *weaker, int *stronger)
1886 {
1887         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1888         if (*weaker > TPC_MAX_REDUCTION)
1889                 *weaker = TPC_INVALID;
1890
1891         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1892         if (*stronger < 0)
1893                 *stronger = TPC_INVALID;
1894 }
1895
1896 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1897                            struct rs_rate *rate, enum ieee80211_band band)
1898 {
1899         int index = rate->index;
1900         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1901         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1902                                 !vif->bss_conf.ps);
1903
1904         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1905                        cam, sta_ps_disabled);
1906         /*
1907          * allow tpc only if power management is enabled, or bt coex
1908          * activity grade allows it and we are on 2.4Ghz.
1909          */
1910         if ((cam || sta_ps_disabled) &&
1911             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1912                 return false;
1913
1914         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1915         if (is_legacy(rate))
1916                 return index == IWL_RATE_54M_INDEX;
1917         if (is_ht(rate))
1918                 return index == IWL_RATE_MCS_7_INDEX;
1919         if (is_vht(rate))
1920                 return index == IWL_RATE_MCS_7_INDEX ||
1921                        index == IWL_RATE_MCS_8_INDEX ||
1922                        index == IWL_RATE_MCS_9_INDEX;
1923
1924         WARN_ON_ONCE(1);
1925         return false;
1926 }
1927
1928 enum tpc_action {
1929         TPC_ACTION_STAY,
1930         TPC_ACTION_DECREASE,
1931         TPC_ACTION_INCREASE,
1932         TPC_ACTION_NO_RESTIRCTION,
1933 };
1934
1935 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1936                                          s32 sr, int weak, int strong,
1937                                          int current_tpt,
1938                                          int weak_tpt, int strong_tpt)
1939 {
1940         /* stay until we have valid tpt */
1941         if (current_tpt == IWL_INVALID_VALUE) {
1942                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1943                 return TPC_ACTION_STAY;
1944         }
1945
1946         /* Too many failures, increase txp */
1947         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1948             current_tpt == 0) {
1949                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1950                 return TPC_ACTION_NO_RESTIRCTION;
1951         }
1952
1953         /* try decreasing first if applicable */
1954         if (weak != TPC_INVALID) {
1955                 if (weak_tpt == IWL_INVALID_VALUE &&
1956                     (strong_tpt == IWL_INVALID_VALUE ||
1957                      current_tpt >= strong_tpt)) {
1958                         IWL_DEBUG_RATE(mvm,
1959                                        "no weak txp measurement. decrease txp\n");
1960                         return TPC_ACTION_DECREASE;
1961                 }
1962
1963                 if (weak_tpt > current_tpt) {
1964                         IWL_DEBUG_RATE(mvm,
1965                                        "lower txp has better tpt. decrease txp\n");
1966                         return TPC_ACTION_DECREASE;
1967                 }
1968         }
1969
1970         /* next, increase if needed */
1971         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1972             strong != TPC_INVALID) {
1973                 if (weak_tpt == IWL_INVALID_VALUE &&
1974                     strong_tpt != IWL_INVALID_VALUE &&
1975                     current_tpt < strong_tpt) {
1976                         IWL_DEBUG_RATE(mvm,
1977                                        "higher txp has better tpt. increase txp\n");
1978                         return TPC_ACTION_INCREASE;
1979                 }
1980
1981                 if (weak_tpt < current_tpt &&
1982                     (strong_tpt == IWL_INVALID_VALUE ||
1983                      strong_tpt > current_tpt)) {
1984                         IWL_DEBUG_RATE(mvm,
1985                                        "lower txp has worse tpt. increase txp\n");
1986                         return TPC_ACTION_INCREASE;
1987                 }
1988         }
1989
1990         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1991         return TPC_ACTION_STAY;
1992 }
1993
1994 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1995                            struct ieee80211_sta *sta,
1996                            struct iwl_lq_sta *lq_sta,
1997                            struct iwl_scale_tbl_info *tbl)
1998 {
1999         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2000         struct ieee80211_vif *vif = mvm_sta->vif;
2001         struct ieee80211_chanctx_conf *chanctx_conf;
2002         enum ieee80211_band band;
2003         struct iwl_rate_scale_data *window;
2004         struct rs_rate *rate = &tbl->rate;
2005         enum tpc_action action;
2006         s32 sr;
2007         u8 cur = lq_sta->lq.reduced_tpc;
2008         int current_tpt;
2009         int weak, strong;
2010         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2011
2012 #ifdef CONFIG_MAC80211_DEBUGFS
2013         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2014                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2015                                lq_sta->pers.dbg_fixed_txp_reduction);
2016                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2017                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2018         }
2019 #endif
2020
2021         rcu_read_lock();
2022         chanctx_conf = rcu_dereference(vif->chanctx_conf);
2023         if (WARN_ON(!chanctx_conf))
2024                 band = IEEE80211_NUM_BANDS;
2025         else
2026                 band = chanctx_conf->def.chan->band;
2027         rcu_read_unlock();
2028
2029         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2030                 IWL_DEBUG_RATE(mvm,
2031                                "tpc is not allowed. remove txp restrictions\n");
2032                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2033                 return cur != TPC_NO_REDUCTION;
2034         }
2035
2036         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2037
2038         /* Collect measured throughputs for current and adjacent rates */
2039         window = tbl->tpc_win;
2040         sr = window[cur].success_ratio;
2041         current_tpt = window[cur].average_tpt;
2042         if (weak != TPC_INVALID)
2043                 weak_tpt = window[weak].average_tpt;
2044         if (strong != TPC_INVALID)
2045                 strong_tpt = window[strong].average_tpt;
2046
2047         IWL_DEBUG_RATE(mvm,
2048                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2049                        cur, current_tpt, sr, weak, strong,
2050                        weak_tpt, strong_tpt);
2051
2052         action = rs_get_tpc_action(mvm, sr, weak, strong,
2053                                    current_tpt, weak_tpt, strong_tpt);
2054
2055         /* override actions if we are on the edge */
2056         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2057                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2058                 action = TPC_ACTION_STAY;
2059         } else if (strong == TPC_INVALID &&
2060                    (action == TPC_ACTION_INCREASE ||
2061                     action == TPC_ACTION_NO_RESTIRCTION)) {
2062                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2063                 action = TPC_ACTION_STAY;
2064         }
2065
2066         switch (action) {
2067         case TPC_ACTION_DECREASE:
2068                 lq_sta->lq.reduced_tpc = weak;
2069                 return true;
2070         case TPC_ACTION_INCREASE:
2071                 lq_sta->lq.reduced_tpc = strong;
2072                 return true;
2073         case TPC_ACTION_NO_RESTIRCTION:
2074                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2075                 return true;
2076         case TPC_ACTION_STAY:
2077                 /* do nothing */
2078                 break;
2079         }
2080         return false;
2081 }
2082
2083 /*
2084  * Do rate scaling and search for new modulation mode.
2085  */
2086 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2087                                   struct ieee80211_sta *sta,
2088                                   struct iwl_lq_sta *lq_sta,
2089                                   int tid)
2090 {
2091         int low = IWL_RATE_INVALID;
2092         int high = IWL_RATE_INVALID;
2093         int index;
2094         struct iwl_rate_scale_data *window = NULL;
2095         int current_tpt = IWL_INVALID_VALUE;
2096         int low_tpt = IWL_INVALID_VALUE;
2097         int high_tpt = IWL_INVALID_VALUE;
2098         u32 fail_count;
2099         enum rs_action scale_action = RS_ACTION_STAY;
2100         u16 rate_mask;
2101         u8 update_lq = 0;
2102         struct iwl_scale_tbl_info *tbl, *tbl1;
2103         u8 active_tbl = 0;
2104         u8 done_search = 0;
2105         u16 high_low;
2106         s32 sr;
2107         u8 prev_agg = lq_sta->is_agg;
2108         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2109         struct iwl_mvm_tid_data *tid_data;
2110         struct rs_rate *rate;
2111
2112         lq_sta->is_agg = !!sta_priv->agg_tids;
2113
2114         /*
2115          * Select rate-scale / modulation-mode table to work with in
2116          * the rest of this function:  "search" if searching for better
2117          * modulation mode, or "active" if doing rate scaling within a mode.
2118          */
2119         if (!lq_sta->search_better_tbl)
2120                 active_tbl = lq_sta->active_tbl;
2121         else
2122                 active_tbl = 1 - lq_sta->active_tbl;
2123
2124         tbl = &(lq_sta->lq_info[active_tbl]);
2125         rate = &tbl->rate;
2126
2127         if (prev_agg != lq_sta->is_agg) {
2128                 IWL_DEBUG_RATE(mvm,
2129                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2130                                prev_agg, lq_sta->is_agg);
2131                 rs_set_expected_tpt_table(lq_sta, tbl);
2132                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2133         }
2134
2135         /* current tx rate */
2136         index = lq_sta->last_txrate_idx;
2137
2138         /* rates available for this association, and for modulation mode */
2139         rate_mask = rs_get_supported_rates(lq_sta, rate);
2140
2141         if (!(BIT(index) & rate_mask)) {
2142                 IWL_ERR(mvm, "Current Rate is not valid\n");
2143                 if (lq_sta->search_better_tbl) {
2144                         /* revert to active table if search table is not valid*/
2145                         rate->type = LQ_NONE;
2146                         lq_sta->search_better_tbl = 0;
2147                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2148                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2149                 }
2150                 return;
2151         }
2152
2153         /* Get expected throughput table and history window for current rate */
2154         if (!tbl->expected_tpt) {
2155                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2156                 return;
2157         }
2158
2159         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2160         window = &(tbl->win[index]);
2161
2162         /*
2163          * If there is not enough history to calculate actual average
2164          * throughput, keep analyzing results of more tx frames, without
2165          * changing rate or mode (bypass most of the rest of this function).
2166          * Set up new rate table in uCode only if old rate is not supported
2167          * in current association (use new rate found above).
2168          */
2169         fail_count = window->counter - window->success_counter;
2170         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2171             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2172                 IWL_DEBUG_RATE(mvm,
2173                                "(%s: %d): Test Window: succ %d total %d\n",
2174                                rs_pretty_lq_type(rate->type),
2175                                index, window->success_counter, window->counter);
2176
2177                 /* Can't calculate this yet; not enough history */
2178                 window->average_tpt = IWL_INVALID_VALUE;
2179
2180                 /* Should we stay with this modulation mode,
2181                  * or search for a new one? */
2182                 rs_stay_in_table(lq_sta, false);
2183
2184                 goto out;
2185         }
2186         /* Else we have enough samples; calculate estimate of
2187          * actual average throughput */
2188         if (window->average_tpt != ((window->success_ratio *
2189                         tbl->expected_tpt[index] + 64) / 128)) {
2190                 window->average_tpt = ((window->success_ratio *
2191                                         tbl->expected_tpt[index] + 64) / 128);
2192         }
2193
2194         /* If we are searching for better modulation mode, check success. */
2195         if (lq_sta->search_better_tbl) {
2196                 /* If good success, continue using the "search" mode;
2197                  * no need to send new link quality command, since we're
2198                  * continuing to use the setup that we've been trying. */
2199                 if (window->average_tpt > lq_sta->last_tpt) {
2200                         IWL_DEBUG_RATE(mvm,
2201                                        "SWITCHING TO NEW TABLE SR: %d "
2202                                        "cur-tpt %d old-tpt %d\n",
2203                                        window->success_ratio,
2204                                        window->average_tpt,
2205                                        lq_sta->last_tpt);
2206
2207                         /* Swap tables; "search" becomes "active" */
2208                         lq_sta->active_tbl = active_tbl;
2209                         current_tpt = window->average_tpt;
2210                 /* Else poor success; go back to mode in "active" table */
2211                 } else {
2212                         IWL_DEBUG_RATE(mvm,
2213                                        "GOING BACK TO THE OLD TABLE: SR %d "
2214                                        "cur-tpt %d old-tpt %d\n",
2215                                        window->success_ratio,
2216                                        window->average_tpt,
2217                                        lq_sta->last_tpt);
2218
2219                         /* Nullify "search" table */
2220                         rate->type = LQ_NONE;
2221
2222                         /* Revert to "active" table */
2223                         active_tbl = lq_sta->active_tbl;
2224                         tbl = &(lq_sta->lq_info[active_tbl]);
2225
2226                         /* Revert to "active" rate and throughput info */
2227                         index = tbl->rate.index;
2228                         current_tpt = lq_sta->last_tpt;
2229
2230                         /* Need to set up a new rate table in uCode */
2231                         update_lq = 1;
2232                 }
2233
2234                 /* Either way, we've made a decision; modulation mode
2235                  * search is done, allow rate adjustment next time. */
2236                 lq_sta->search_better_tbl = 0;
2237                 done_search = 1;        /* Don't switch modes below! */
2238                 goto lq_update;
2239         }
2240
2241         /* (Else) not in search of better modulation mode, try for better
2242          * starting rate, while staying in this mode. */
2243         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2244         low = high_low & 0xff;
2245         high = (high_low >> 8) & 0xff;
2246
2247         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2248
2249         sr = window->success_ratio;
2250
2251         /* Collect measured throughputs for current and adjacent rates */
2252         current_tpt = window->average_tpt;
2253         if (low != IWL_RATE_INVALID)
2254                 low_tpt = tbl->win[low].average_tpt;
2255         if (high != IWL_RATE_INVALID)
2256                 high_tpt = tbl->win[high].average_tpt;
2257
2258         IWL_DEBUG_RATE(mvm,
2259                        "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2260                        rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2261                        low, high, low_tpt, high_tpt);
2262
2263         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2264                                           current_tpt, low_tpt, high_tpt);
2265
2266         /* Force a search in case BT doesn't like us being in MIMO */
2267         if (is_mimo(rate) &&
2268             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2269                 IWL_DEBUG_RATE(mvm,
2270                                "BT Coex forbids MIMO. Search for new config\n");
2271                 rs_stay_in_table(lq_sta, true);
2272                 goto lq_update;
2273         }
2274
2275         switch (scale_action) {
2276         case RS_ACTION_DOWNSCALE:
2277                 /* Decrease starting rate, update uCode's rate table */
2278                 if (low != IWL_RATE_INVALID) {
2279                         update_lq = 1;
2280                         index = low;
2281                 } else {
2282                         IWL_DEBUG_RATE(mvm,
2283                                        "At the bottom rate. Can't decrease\n");
2284                 }
2285
2286                 break;
2287         case RS_ACTION_UPSCALE:
2288                 /* Increase starting rate, update uCode's rate table */
2289                 if (high != IWL_RATE_INVALID) {
2290                         update_lq = 1;
2291                         index = high;
2292                 } else {
2293                         IWL_DEBUG_RATE(mvm,
2294                                        "At the top rate. Can't increase\n");
2295                 }
2296
2297                 break;
2298         case RS_ACTION_STAY:
2299                 /* No change */
2300                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2301                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2302                 break;
2303         default:
2304                 break;
2305         }
2306
2307 lq_update:
2308         /* Replace uCode's rate table for the destination station. */
2309         if (update_lq) {
2310                 tbl->rate.index = index;
2311                 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2312         }
2313
2314         rs_stay_in_table(lq_sta, false);
2315
2316         /*
2317          * Search for new modulation mode if we're:
2318          * 1)  Not changing rates right now
2319          * 2)  Not just finishing up a search
2320          * 3)  Allowing a new search
2321          */
2322         if (!update_lq && !done_search &&
2323             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2324             && window->counter) {
2325                 enum rs_column next_column;
2326
2327                 /* Save current throughput to compare with "search" throughput*/
2328                 lq_sta->last_tpt = current_tpt;
2329
2330                 IWL_DEBUG_RATE(mvm,
2331                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2332                                update_lq, done_search, lq_sta->rs_state,
2333                                window->counter);
2334
2335                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2336                 if (next_column != RS_COLUMN_INVALID) {
2337                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2338                                                       next_column);
2339                         if (!ret)
2340                                 lq_sta->search_better_tbl = 1;
2341                 } else {
2342                         IWL_DEBUG_RATE(mvm,
2343                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2344                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2345                 }
2346
2347                 /* If new "search" mode was selected, set up in uCode table */
2348                 if (lq_sta->search_better_tbl) {
2349                         /* Access the "search" table, clear its history. */
2350                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2351                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2352
2353                         /* Use new "search" start rate */
2354                         index = tbl->rate.index;
2355
2356                         rs_dump_rate(mvm, &tbl->rate,
2357                                      "Switch to SEARCH TABLE:");
2358                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2359                 } else {
2360                         done_search = 1;
2361                 }
2362         }
2363
2364         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2365                 /* If the "active" (non-search) mode was legacy,
2366                  * and we've tried switching antennas,
2367                  * but we haven't been able to try HT modes (not available),
2368                  * stay with best antenna legacy modulation for a while
2369                  * before next round of mode comparisons. */
2370                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2371                 if (is_legacy(&tbl1->rate)) {
2372                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2373
2374                         if (tid != IWL_MAX_TID_COUNT) {
2375                                 tid_data = &sta_priv->tid_data[tid];
2376                                 if (tid_data->state != IWL_AGG_OFF) {
2377                                         IWL_DEBUG_RATE(mvm,
2378                                                        "Stop aggregation on tid %d\n",
2379                                                        tid);
2380                                         ieee80211_stop_tx_ba_session(sta, tid);
2381                                 }
2382                         }
2383                         rs_set_stay_in_table(mvm, 1, lq_sta);
2384                 } else {
2385                 /* If we're in an HT mode, and all 3 mode switch actions
2386                  * have been tried and compared, stay in this best modulation
2387                  * mode for a while before next round of mode comparisons. */
2388                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2389                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2390                             (tid != IWL_MAX_TID_COUNT)) {
2391                                 tid_data = &sta_priv->tid_data[tid];
2392                                 if (tid_data->state == IWL_AGG_OFF) {
2393                                         IWL_DEBUG_RATE(mvm,
2394                                                        "try to aggregate tid %d\n",
2395                                                        tid);
2396                                         rs_tl_turn_on_agg(mvm, tid,
2397                                                           lq_sta, sta);
2398                                 }
2399                         }
2400                         rs_set_stay_in_table(mvm, 0, lq_sta);
2401                 }
2402         }
2403
2404 out:
2405         lq_sta->last_txrate_idx = index;
2406 }
2407
2408 struct rs_init_rate_info {
2409         s8 rssi;
2410         u8 rate_idx;
2411 };
2412
2413 static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
2414         { -60, IWL_RATE_54M_INDEX },
2415         { -64, IWL_RATE_48M_INDEX },
2416         { -68, IWL_RATE_36M_INDEX },
2417         { -80, IWL_RATE_24M_INDEX },
2418         { -84, IWL_RATE_18M_INDEX },
2419         { -85, IWL_RATE_12M_INDEX },
2420         { -86, IWL_RATE_11M_INDEX },
2421         { -88, IWL_RATE_5M_INDEX  },
2422         { -90, IWL_RATE_2M_INDEX  },
2423         { S8_MIN, IWL_RATE_1M_INDEX },
2424 };
2425
2426 static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
2427         { -60, IWL_RATE_54M_INDEX },
2428         { -64, IWL_RATE_48M_INDEX },
2429         { -72, IWL_RATE_36M_INDEX },
2430         { -80, IWL_RATE_24M_INDEX },
2431         { -84, IWL_RATE_18M_INDEX },
2432         { -85, IWL_RATE_12M_INDEX },
2433         { -87, IWL_RATE_9M_INDEX  },
2434         { S8_MIN, IWL_RATE_6M_INDEX },
2435 };
2436
2437 /* Choose an initial legacy rate and antenna to use based on the RSSI
2438  * of last Rx
2439  */
2440 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2441                                 struct iwl_lq_sta *lq_sta,
2442                                 enum ieee80211_band band,
2443                                 struct rs_rate *rate)
2444 {
2445         int i, nentries;
2446         s8 best_rssi = S8_MIN;
2447         u8 best_ant = ANT_NONE;
2448         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2449         const struct rs_init_rate_info *initial_rates;
2450
2451         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2452                 if (!(lq_sta->pers.chains & BIT(i)))
2453                         continue;
2454
2455                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2456                         best_rssi = lq_sta->pers.chain_signal[i];
2457                         best_ant = BIT(i);
2458                 }
2459         }
2460
2461         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2462                        rs_pretty_ant(best_ant), best_rssi);
2463
2464         if (best_ant != ANT_A && best_ant != ANT_B)
2465                 rate->ant = first_antenna(valid_tx_ant);
2466         else
2467                 rate->ant = best_ant;
2468
2469         rate->sgi = false;
2470         rate->ldpc = false;
2471         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2472
2473         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2474                                      BITS_PER_LONG);
2475
2476         if (band == IEEE80211_BAND_5GHZ) {
2477                 rate->type = LQ_LEGACY_A;
2478                 initial_rates = rs_init_rates_5ghz;
2479                 nentries = ARRAY_SIZE(rs_init_rates_5ghz);
2480         } else {
2481                 rate->type = LQ_LEGACY_G;
2482                 initial_rates = rs_init_rates_24ghz;
2483                 nentries = ARRAY_SIZE(rs_init_rates_24ghz);
2484         }
2485
2486         if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2487                 for (i = 0; i < nentries; i++) {
2488                         int rate_idx = initial_rates[i].rate_idx;
2489                         if ((best_rssi >= initial_rates[i].rssi) &&
2490                             (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2491                                 rate->index = rate_idx;
2492                                 break;
2493                         }
2494                 }
2495         }
2496
2497         IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2498                        rs_pretty_ant(rate->ant));
2499 }
2500
2501 /* Save info about RSSI of last Rx */
2502 void rs_update_last_rssi(struct iwl_mvm *mvm,
2503                          struct iwl_lq_sta *lq_sta,
2504                          struct ieee80211_rx_status *rx_status)
2505 {
2506         lq_sta->pers.chains = rx_status->chains;
2507         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2508         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2509         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2510 }
2511
2512 /**
2513  * rs_initialize_lq - Initialize a station's hardware rate table
2514  *
2515  * The uCode's station table contains a table of fallback rates
2516  * for automatic fallback during transmission.
2517  *
2518  * NOTE: This sets up a default set of values.  These will be replaced later
2519  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2520  *       rc80211_simple.
2521  *
2522  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2523  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2524  *       which requires station table entry to exist).
2525  */
2526 static void rs_initialize_lq(struct iwl_mvm *mvm,
2527                              struct ieee80211_sta *sta,
2528                              struct iwl_lq_sta *lq_sta,
2529                              enum ieee80211_band band,
2530                              bool init)
2531 {
2532         struct iwl_scale_tbl_info *tbl;
2533         struct rs_rate *rate;
2534         u8 active_tbl = 0;
2535
2536         if (!sta || !lq_sta)
2537                 return;
2538
2539         if (!lq_sta->search_better_tbl)
2540                 active_tbl = lq_sta->active_tbl;
2541         else
2542                 active_tbl = 1 - lq_sta->active_tbl;
2543
2544         tbl = &(lq_sta->lq_info[active_tbl]);
2545         rate = &tbl->rate;
2546
2547         rs_get_initial_rate(mvm, lq_sta, band, rate);
2548         lq_sta->last_txrate_idx = rate->index;
2549
2550         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2551         if (rate->ant == ANT_A)
2552                 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2553         else
2554                 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2555
2556         rs_set_expected_tpt_table(lq_sta, tbl);
2557         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2558         /* TODO restore station should remember the lq cmd */
2559         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2560 }
2561
2562 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2563                         struct ieee80211_tx_rate_control *txrc)
2564 {
2565         struct sk_buff *skb = txrc->skb;
2566         struct iwl_op_mode *op_mode __maybe_unused =
2567                         (struct iwl_op_mode *)mvm_r;
2568         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2569         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2570         struct iwl_lq_sta *lq_sta = mvm_sta;
2571
2572         if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2573                 /* if vif isn't initialized mvm doesn't know about
2574                  * this station, so don't do anything with the it
2575                  */
2576                 sta = NULL;
2577                 mvm_sta = NULL;
2578         }
2579
2580         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2581
2582         /* Treat uninitialized rate scaling data same as non-existing. */
2583         if (lq_sta && !lq_sta->pers.drv) {
2584                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2585                 mvm_sta = NULL;
2586         }
2587
2588         /* Send management frames and NO_ACK data using lowest rate. */
2589         if (rate_control_send_low(sta, mvm_sta, txrc))
2590                 return;
2591
2592         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2593                                   info->band, &info->control.rates[0]);
2594
2595         info->control.rates[0].count = 1;
2596 }
2597
2598 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2599                           gfp_t gfp)
2600 {
2601         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2602         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2603         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2604         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2605
2606         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2607
2608         lq_sta->pers.drv = mvm;
2609 #ifdef CONFIG_MAC80211_DEBUGFS
2610         lq_sta->pers.dbg_fixed_rate = 0;
2611         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2612         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2613 #endif
2614         lq_sta->pers.chains = 0;
2615         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2616
2617         return &sta_priv->lq_sta;
2618 }
2619
2620 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2621                                        int nss)
2622 {
2623         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2624                 (0x3 << (2 * (nss - 1)));
2625         rx_mcs >>= (2 * (nss - 1));
2626
2627         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2628                 return IWL_RATE_MCS_7_INDEX;
2629         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2630                 return IWL_RATE_MCS_8_INDEX;
2631         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2632                 return IWL_RATE_MCS_9_INDEX;
2633
2634         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2635         return -1;
2636 }
2637
2638 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2639                                      struct ieee80211_sta_vht_cap *vht_cap,
2640                                      struct iwl_lq_sta *lq_sta)
2641 {
2642         int i;
2643         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2644
2645         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2646                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2647                         if (i == IWL_RATE_9M_INDEX)
2648                                 continue;
2649
2650                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2651                         if (i == IWL_RATE_MCS_9_INDEX &&
2652                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2653                                 continue;
2654
2655                         lq_sta->active_siso_rate |= BIT(i);
2656                 }
2657         }
2658
2659         if (sta->rx_nss < 2)
2660                 return;
2661
2662         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2663         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2664                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2665                         if (i == IWL_RATE_9M_INDEX)
2666                                 continue;
2667
2668                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2669                         if (i == IWL_RATE_MCS_9_INDEX &&
2670                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2671                                 continue;
2672
2673                         lq_sta->active_mimo2_rate |= BIT(i);
2674                 }
2675         }
2676 }
2677
2678 static void rs_ht_init(struct iwl_mvm *mvm,
2679                        struct ieee80211_sta *sta,
2680                        struct iwl_lq_sta *lq_sta,
2681                        struct ieee80211_sta_ht_cap *ht_cap)
2682 {
2683         /* active_siso_rate mask includes 9 MBits (bit 5),
2684          * and CCK (bits 0-3), supp_rates[] does not;
2685          * shift to convert format, force 9 MBits off.
2686          */
2687         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2688         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2689         lq_sta->active_siso_rate &= ~((u16)0x2);
2690         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2691
2692         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2693         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2694         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2695         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2696
2697         if (mvm->cfg->ht_params->ldpc &&
2698             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2699                 lq_sta->ldpc = true;
2700
2701         if (mvm->cfg->ht_params->stbc &&
2702             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2703             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2704                 lq_sta->stbc_capable = true;
2705
2706         lq_sta->is_vht = false;
2707 }
2708
2709 static void rs_vht_init(struct iwl_mvm *mvm,
2710                         struct ieee80211_sta *sta,
2711                         struct iwl_lq_sta *lq_sta,
2712                         struct ieee80211_sta_vht_cap *vht_cap)
2713 {
2714         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2715
2716         if (mvm->cfg->ht_params->ldpc &&
2717             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2718                 lq_sta->ldpc = true;
2719
2720         if (mvm->cfg->ht_params->stbc &&
2721             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2722             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2723                 lq_sta->stbc_capable = true;
2724
2725         if ((mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2726             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2727             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2728                 lq_sta->bfer_capable = true;
2729
2730         lq_sta->is_vht = true;
2731 }
2732
2733 #ifdef CONFIG_IWLWIFI_DEBUGFS
2734 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2735 {
2736         spin_lock_bh(&mvm->drv_stats_lock);
2737         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2738         spin_unlock_bh(&mvm->drv_stats_lock);
2739 }
2740
2741 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2742 {
2743         u8 nss = 0, mcs = 0;
2744
2745         spin_lock(&mvm->drv_stats_lock);
2746
2747         if (agg)
2748                 mvm->drv_rx_stats.agg_frames++;
2749
2750         mvm->drv_rx_stats.success_frames++;
2751
2752         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2753         case RATE_MCS_CHAN_WIDTH_20:
2754                 mvm->drv_rx_stats.bw_20_frames++;
2755                 break;
2756         case RATE_MCS_CHAN_WIDTH_40:
2757                 mvm->drv_rx_stats.bw_40_frames++;
2758                 break;
2759         case RATE_MCS_CHAN_WIDTH_80:
2760                 mvm->drv_rx_stats.bw_80_frames++;
2761                 break;
2762         default:
2763                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2764         }
2765
2766         if (rate & RATE_MCS_HT_MSK) {
2767                 mvm->drv_rx_stats.ht_frames++;
2768                 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2769                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2770         } else if (rate & RATE_MCS_VHT_MSK) {
2771                 mvm->drv_rx_stats.vht_frames++;
2772                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2773                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2774                        RATE_VHT_MCS_NSS_POS) + 1;
2775         } else {
2776                 mvm->drv_rx_stats.legacy_frames++;
2777         }
2778
2779         if (nss == 1)
2780                 mvm->drv_rx_stats.siso_frames++;
2781         else if (nss == 2)
2782                 mvm->drv_rx_stats.mimo2_frames++;
2783
2784         if (rate & RATE_MCS_SGI_MSK)
2785                 mvm->drv_rx_stats.sgi_frames++;
2786         else
2787                 mvm->drv_rx_stats.ngi_frames++;
2788
2789         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2790         mvm->drv_rx_stats.last_frame_idx =
2791                 (mvm->drv_rx_stats.last_frame_idx + 1) %
2792                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2793
2794         spin_unlock(&mvm->drv_stats_lock);
2795 }
2796 #endif
2797
2798 /*
2799  * Called after adding a new station to initialize rate scaling
2800  */
2801 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2802                           enum ieee80211_band band, bool init)
2803 {
2804         int i, j;
2805         struct ieee80211_hw *hw = mvm->hw;
2806         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2807         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2808         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2809         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2810         struct ieee80211_supported_band *sband;
2811         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2812
2813         /* clear all non-persistent lq data */
2814         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2815
2816         sband = hw->wiphy->bands[band];
2817
2818         lq_sta->lq.sta_id = sta_priv->sta_id;
2819
2820         for (j = 0; j < LQ_SIZE; j++)
2821                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2822
2823         lq_sta->flush_timer = 0;
2824         lq_sta->last_tx = jiffies;
2825
2826         IWL_DEBUG_RATE(mvm,
2827                        "LQ: *** rate scale station global init for station %d ***\n",
2828                        sta_priv->sta_id);
2829         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2830          * the lowest or the highest rate.. Could consider using RSSI from
2831          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2832          * after assoc.. */
2833
2834         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2835         lq_sta->band = sband->band;
2836         /*
2837          * active legacy rates as per supported rates bitmap
2838          */
2839         supp = sta->supp_rates[sband->band];
2840         lq_sta->active_legacy_rate = 0;
2841         for_each_set_bit(i, &supp, BITS_PER_LONG)
2842                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2843
2844         /* TODO: should probably account for rx_highest for both HT/VHT */
2845         if (!vht_cap || !vht_cap->vht_supported)
2846                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
2847         else
2848                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
2849
2850         if (IWL_MVM_RS_DISABLE_P2P_MIMO && sta_priv->vif->p2p)
2851                 lq_sta->active_mimo2_rate = 0;
2852
2853         lq_sta->max_legacy_rate_idx =
2854                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2855         lq_sta->max_siso_rate_idx =
2856                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2857         lq_sta->max_mimo2_rate_idx =
2858                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2859
2860         IWL_DEBUG_RATE(mvm,
2861                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2862                        lq_sta->active_legacy_rate,
2863                        lq_sta->active_siso_rate,
2864                        lq_sta->active_mimo2_rate,
2865                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
2866                        lq_sta->bfer_capable);
2867         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2868                        lq_sta->max_legacy_rate_idx,
2869                        lq_sta->max_siso_rate_idx,
2870                        lq_sta->max_mimo2_rate_idx);
2871
2872         /* These values will be overridden later */
2873         lq_sta->lq.single_stream_ant_msk =
2874                 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
2875         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2876
2877         /* as default allow aggregation for all tids */
2878         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2879         lq_sta->is_agg = 0;
2880 #ifdef CONFIG_IWLWIFI_DEBUGFS
2881         iwl_mvm_reset_frame_stats(mvm);
2882 #endif
2883         rs_initialize_lq(mvm, sta, lq_sta, band, init);
2884 }
2885
2886 static void rs_rate_update(void *mvm_r,
2887                            struct ieee80211_supported_band *sband,
2888                            struct cfg80211_chan_def *chandef,
2889                            struct ieee80211_sta *sta, void *priv_sta,
2890                            u32 changed)
2891 {
2892         u8 tid;
2893         struct iwl_op_mode *op_mode  =
2894                         (struct iwl_op_mode *)mvm_r;
2895         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2896
2897         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
2898                 return;
2899
2900         /* Stop any ongoing aggregations as rs starts off assuming no agg */
2901         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2902                 ieee80211_stop_tx_ba_session(sta, tid);
2903
2904         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2905 }
2906
2907 #ifdef CONFIG_MAC80211_DEBUGFS
2908 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2909                                             struct iwl_lq_cmd *lq_cmd,
2910                                             enum ieee80211_band band,
2911                                             u32 ucode_rate)
2912 {
2913         struct rs_rate rate;
2914         int i;
2915         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2916         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2917         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2918
2919         for (i = 0; i < num_rates; i++)
2920                 lq_cmd->rs_table[i] = ucode_rate_le32;
2921
2922         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2923
2924         if (is_mimo(&rate))
2925                 lq_cmd->mimo_delim = num_rates - 1;
2926         else
2927                 lq_cmd->mimo_delim = 0;
2928
2929         lq_cmd->reduced_tpc = 0;
2930
2931         if (num_of_ant(ant) == 1)
2932                 lq_cmd->single_stream_ant_msk = ant;
2933
2934         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2935 }
2936 #endif /* CONFIG_MAC80211_DEBUGFS */
2937
2938 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2939                                      struct iwl_lq_sta *lq_sta,
2940                                      struct rs_rate *rate,
2941                                      __le32 *rs_table, int *rs_table_index,
2942                                      int num_rates, int num_retries,
2943                                      u8 valid_tx_ant, bool toggle_ant)
2944 {
2945         int i, j;
2946         __le32 ucode_rate;
2947         bool bottom_reached = false;
2948         int prev_rate_idx = rate->index;
2949         int end = LINK_QUAL_MAX_RETRY_NUM;
2950         int index = *rs_table_index;
2951
2952         for (i = 0; i < num_rates && index < end; i++) {
2953                 for (j = 0; j < num_retries && index < end; j++, index++) {
2954                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
2955                                                                          rate));
2956                         rs_table[index] = ucode_rate;
2957                         if (toggle_ant)
2958                                 rs_toggle_antenna(valid_tx_ant, rate);
2959                 }
2960
2961                 prev_rate_idx = rate->index;
2962                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2963                 if (bottom_reached && !is_legacy(rate))
2964                         break;
2965         }
2966
2967         if (!bottom_reached && !is_legacy(rate))
2968                 rate->index = prev_rate_idx;
2969
2970         *rs_table_index = index;
2971 }
2972
2973 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2974  * column the rate table should look like this:
2975  *
2976  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2977  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2978  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2979  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2980  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2981  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2982  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2983  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2984  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2985  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2986  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2987  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2988  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2989  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2990  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2991  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2992  */
2993 static void rs_build_rates_table(struct iwl_mvm *mvm,
2994                                  struct ieee80211_sta *sta,
2995                                  struct iwl_lq_sta *lq_sta,
2996                                  const struct rs_rate *initial_rate)
2997 {
2998         struct rs_rate rate;
2999         int num_rates, num_retries, index = 0;
3000         u8 valid_tx_ant = 0;
3001         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3002         bool toggle_ant = false;
3003
3004         memcpy(&rate, initial_rate, sizeof(rate));
3005
3006         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3007
3008         /* TODO: remove old API when min FW API hits 14 */
3009         if (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3010             rs_stbc_allow(mvm, sta, lq_sta))
3011                 rate.stbc = true;
3012
3013         if (is_siso(&rate)) {
3014                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3015                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3016         } else if (is_mimo(&rate)) {
3017                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3018                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3019         } else {
3020                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3021                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3022                 toggle_ant = true;
3023         }
3024
3025         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3026                                  num_rates, num_retries, valid_tx_ant,
3027                                  toggle_ant);
3028
3029         rs_get_lower_rate_down_column(lq_sta, &rate);
3030
3031         if (is_siso(&rate)) {
3032                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3033                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3034                 lq_cmd->mimo_delim = index;
3035         } else if (is_legacy(&rate)) {
3036                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3037                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3038         } else {
3039                 WARN_ON_ONCE(1);
3040         }
3041
3042         toggle_ant = true;
3043
3044         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3045                                  num_rates, num_retries, valid_tx_ant,
3046                                  toggle_ant);
3047
3048         rs_get_lower_rate_down_column(lq_sta, &rate);
3049
3050         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3051         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3052
3053         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3054                                  num_rates, num_retries, valid_tx_ant,
3055                                  toggle_ant);
3056
3057 }
3058
3059 struct rs_bfer_active_iter_data {
3060         struct ieee80211_sta *exclude_sta;
3061         struct iwl_mvm_sta *bfer_mvmsta;
3062 };
3063
3064 static void rs_bfer_active_iter(void *_data,
3065                                 struct ieee80211_sta *sta)
3066 {
3067         struct rs_bfer_active_iter_data *data = _data;
3068         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3069         struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3070         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3071
3072         if (sta == data->exclude_sta)
3073                 return;
3074
3075         /* The current sta has BFER allowed */
3076         if (ss_params & LQ_SS_BFER_ALLOWED) {
3077                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3078
3079                 data->bfer_mvmsta = mvmsta;
3080         }
3081 }
3082
3083 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3084 {
3085         int prio = -1;
3086         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3087
3088         switch (viftype) {
3089         case NL80211_IFTYPE_AP:
3090         case NL80211_IFTYPE_P2P_GO:
3091                 prio = 3;
3092                 break;
3093         case NL80211_IFTYPE_P2P_CLIENT:
3094                 prio = 2;
3095                 break;
3096         case NL80211_IFTYPE_STATION:
3097                 prio = 1;
3098                 break;
3099         default:
3100                 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3101                 prio = -1;
3102         }
3103
3104         return prio;
3105 }
3106
3107 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3108 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3109                                 struct iwl_mvm_sta *sta2)
3110 {
3111         int prio1 = rs_bfer_priority(sta1);
3112         int prio2 = rs_bfer_priority(sta2);
3113
3114         if (prio1 > prio2)
3115                 return 1;
3116         if (prio1 < prio2)
3117                 return -1;
3118         return 0;
3119 }
3120
3121 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3122                                 struct ieee80211_sta *sta,
3123                                 struct iwl_lq_sta *lq_sta,
3124                                 const struct rs_rate *initial_rate)
3125 {
3126         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3127         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3128         struct rs_bfer_active_iter_data data = {
3129                 .exclude_sta = sta,
3130                 .bfer_mvmsta = NULL,
3131         };
3132         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3133         u32 ss_params = LQ_SS_PARAMS_VALID;
3134
3135         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3136                 goto out;
3137
3138 #ifdef CONFIG_MAC80211_DEBUGFS
3139         /* Check if forcing the decision is configured.
3140          * Note that SISO is forced by not allowing STBC or BFER
3141          */
3142         if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3143                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3144         else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3145                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3146
3147         if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3148                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3149                                lq_sta->pers.ss_force);
3150                 goto out;
3151         }
3152 #endif
3153
3154         if (lq_sta->stbc_capable)
3155                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3156
3157         if (!lq_sta->bfer_capable)
3158                 goto out;
3159
3160         ieee80211_iterate_stations_atomic(mvm->hw,
3161                                           rs_bfer_active_iter,
3162                                           &data);
3163         bfer_mvmsta = data.bfer_mvmsta;
3164
3165         /* This code is safe as it doesn't run concurrently for different
3166          * stations. This is guaranteed by the fact that calls to
3167          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3168          */
3169         if (!bfer_mvmsta) {
3170                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3171
3172                 ss_params |= LQ_SS_BFER_ALLOWED;
3173                 goto out;
3174         }
3175
3176         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3177                        bfer_mvmsta->sta_id);
3178
3179         /* Disallow BFER on another STA if active and we're a higher priority */
3180         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3181                 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3182                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3183
3184                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3185                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3186                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3187
3188                 ss_params |= LQ_SS_BFER_ALLOWED;
3189                 IWL_DEBUG_RATE(mvm,
3190                                "Lower priority BFER sta found (%d). Switch BFER\n",
3191                                bfer_mvmsta->sta_id);
3192         }
3193 out:
3194         lq_cmd->ss_params = cpu_to_le32(ss_params);
3195 }
3196
3197 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3198                            struct ieee80211_sta *sta,
3199                            struct iwl_lq_sta *lq_sta,
3200                            const struct rs_rate *initial_rate)
3201 {
3202         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3203         struct iwl_mvm_sta *mvmsta;
3204         struct iwl_mvm_vif *mvmvif;
3205
3206         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3207         lq_cmd->agg_time_limit =
3208                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3209
3210 #ifdef CONFIG_MAC80211_DEBUGFS
3211         if (lq_sta->pers.dbg_fixed_rate) {
3212                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3213                                                 lq_sta->band,
3214                                                 lq_sta->pers.dbg_fixed_rate);
3215                 return;
3216         }
3217 #endif
3218         if (WARN_ON_ONCE(!sta || !initial_rate))
3219                 return;
3220
3221         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3222
3223         if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS)
3224                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3225
3226         if (num_of_ant(initial_rate->ant) == 1)
3227                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3228
3229         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3230         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3231
3232         if (num_of_ant(initial_rate->ant) == 1)
3233                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3234
3235         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3236
3237         /*
3238          * In case of low latency, tell the firmware to leave a frame in the
3239          * Tx Fifo so that it can start a transaction in the same TxOP. This
3240          * basically allows the firmware to send bursts.
3241          */
3242         if (iwl_mvm_vif_low_latency(mvmvif)) {
3243                 lq_cmd->agg_frame_cnt_limit--;
3244
3245                 if (mvm->low_latency_agg_frame_limit)
3246                         lq_cmd->agg_frame_cnt_limit =
3247                                 min(lq_cmd->agg_frame_cnt_limit,
3248                                     mvm->low_latency_agg_frame_limit);
3249         }
3250
3251         if (mvmsta->vif->p2p)
3252                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3253
3254         lq_cmd->agg_time_limit =
3255                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3256 }
3257
3258 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3259 {
3260         return hw->priv;
3261 }
3262 /* rate scale requires free function to be implemented */
3263 static void rs_free(void *mvm_rate)
3264 {
3265         return;
3266 }
3267
3268 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3269                         void *mvm_sta)
3270 {
3271         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3272         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3273
3274         IWL_DEBUG_RATE(mvm, "enter\n");
3275         IWL_DEBUG_RATE(mvm, "leave\n");
3276 }
3277
3278 #ifdef CONFIG_MAC80211_DEBUGFS
3279 int rs_pretty_print_rate(char *buf, const u32 rate)
3280 {
3281
3282         char *type, *bw;
3283         u8 mcs = 0, nss = 0;
3284         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3285
3286         if (!(rate & RATE_MCS_HT_MSK) &&
3287             !(rate & RATE_MCS_VHT_MSK)) {
3288                 int index = iwl_hwrate_to_plcp_idx(rate);
3289
3290                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3291                                rs_pretty_ant(ant),
3292                                index == IWL_RATE_INVALID ? "BAD" :
3293                                iwl_rate_mcs[index].mbps);
3294         }
3295
3296         if (rate & RATE_MCS_VHT_MSK) {
3297                 type = "VHT";
3298                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3299                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3300                        >> RATE_VHT_MCS_NSS_POS) + 1;
3301         } else if (rate & RATE_MCS_HT_MSK) {
3302                 type = "HT";
3303                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3304         } else {
3305                 type = "Unknown"; /* shouldn't happen */
3306         }
3307
3308         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3309         case RATE_MCS_CHAN_WIDTH_20:
3310                 bw = "20Mhz";
3311                 break;
3312         case RATE_MCS_CHAN_WIDTH_40:
3313                 bw = "40Mhz";
3314                 break;
3315         case RATE_MCS_CHAN_WIDTH_80:
3316                 bw = "80Mhz";
3317                 break;
3318         case RATE_MCS_CHAN_WIDTH_160:
3319                 bw = "160Mhz";
3320                 break;
3321         default:
3322                 bw = "BAD BW";
3323         }
3324
3325         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3326                        type, rs_pretty_ant(ant), bw, mcs, nss,
3327                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3328                        (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3329                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3330                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3331                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3332 }
3333
3334 /**
3335  * Program the device to use fixed rate for frame transmit
3336  * This is for debugging/testing only
3337  * once the device start use fixed rate, we need to reload the module
3338  * to being back the normal operation.
3339  */
3340 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3341                                 struct iwl_lq_sta *lq_sta)
3342 {
3343         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3344         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3345         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3346
3347         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3348                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3349
3350         if (lq_sta->pers.dbg_fixed_rate) {
3351                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3352                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3353         }
3354 }
3355
3356 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3357                         const char __user *user_buf, size_t count, loff_t *ppos)
3358 {
3359         struct iwl_lq_sta *lq_sta = file->private_data;
3360         struct iwl_mvm *mvm;
3361         char buf[64];
3362         size_t buf_size;
3363         u32 parsed_rate;
3364
3365         mvm = lq_sta->pers.drv;
3366         memset(buf, 0, sizeof(buf));
3367         buf_size = min(count, sizeof(buf) -  1);
3368         if (copy_from_user(buf, user_buf, buf_size))
3369                 return -EFAULT;
3370
3371         if (sscanf(buf, "%x", &parsed_rate) == 1)
3372                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3373         else
3374                 lq_sta->pers.dbg_fixed_rate = 0;
3375
3376         rs_program_fix_rate(mvm, lq_sta);
3377
3378         return count;
3379 }
3380
3381 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3382                         char __user *user_buf, size_t count, loff_t *ppos)
3383 {
3384         char *buff;
3385         int desc = 0;
3386         int i = 0;
3387         ssize_t ret;
3388
3389         struct iwl_lq_sta *lq_sta = file->private_data;
3390         struct iwl_mvm *mvm;
3391         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3392         struct rs_rate *rate = &tbl->rate;
3393         u32 ss_params;
3394         mvm = lq_sta->pers.drv;
3395         buff = kmalloc(2048, GFP_KERNEL);
3396         if (!buff)
3397                 return -ENOMEM;
3398
3399         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3400         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3401                         lq_sta->total_failed, lq_sta->total_success,
3402                         lq_sta->active_legacy_rate);
3403         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3404                         lq_sta->pers.dbg_fixed_rate);
3405         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3406             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3407             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3408             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3409         desc += sprintf(buff+desc, "lq type %s\n",
3410                         (is_legacy(rate)) ? "legacy" :
3411                         is_vht(rate) ? "VHT" : "HT");
3412         if (!is_legacy(rate)) {
3413                 desc += sprintf(buff + desc, " %s",
3414                    (is_siso(rate)) ? "SISO" : "MIMO2");
3415                 desc += sprintf(buff + desc, " %s",
3416                                 (is_ht20(rate)) ? "20MHz" :
3417                                 (is_ht40(rate)) ? "40MHz" :
3418                                 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3419                 desc += sprintf(buff + desc, " %s %s %s\n",
3420                                 (rate->sgi) ? "SGI" : "NGI",
3421                                 (rate->ldpc) ? "LDPC" : "BCC",
3422                                 (lq_sta->is_agg) ? "AGG on" : "");
3423         }
3424         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3425                         lq_sta->last_rate_n_flags);
3426         desc += sprintf(buff+desc,
3427                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3428                         lq_sta->lq.flags,
3429                         lq_sta->lq.mimo_delim,
3430                         lq_sta->lq.single_stream_ant_msk,
3431                         lq_sta->lq.dual_stream_ant_msk);
3432
3433         desc += sprintf(buff+desc,
3434                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3435                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3436                         lq_sta->lq.agg_disable_start_th,
3437                         lq_sta->lq.agg_frame_cnt_limit);
3438
3439         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3440         ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3441         desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3442                         (ss_params & LQ_SS_PARAMS_VALID) ?
3443                         "VALID" : "INVALID",
3444                         (ss_params & LQ_SS_BFER_ALLOWED) ?
3445                         ", BFER" : "",
3446                         (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3447                         ", STBC" : "",
3448                         (ss_params & LQ_SS_FORCE) ?
3449                         ", FORCE" : "");
3450         desc += sprintf(buff+desc,
3451                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3452                         lq_sta->lq.initial_rate_index[0],
3453                         lq_sta->lq.initial_rate_index[1],
3454                         lq_sta->lq.initial_rate_index[2],
3455                         lq_sta->lq.initial_rate_index[3]);
3456
3457         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3458                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3459
3460                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3461                 desc += rs_pretty_print_rate(buff+desc, r);
3462         }
3463
3464         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3465         kfree(buff);
3466         return ret;
3467 }
3468
3469 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3470         .write = rs_sta_dbgfs_scale_table_write,
3471         .read = rs_sta_dbgfs_scale_table_read,
3472         .open = simple_open,
3473         .llseek = default_llseek,
3474 };
3475 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3476                         char __user *user_buf, size_t count, loff_t *ppos)
3477 {
3478         char *buff;
3479         int desc = 0;
3480         int i, j;
3481         ssize_t ret;
3482         struct iwl_scale_tbl_info *tbl;
3483         struct rs_rate *rate;
3484         struct iwl_lq_sta *lq_sta = file->private_data;
3485
3486         buff = kmalloc(1024, GFP_KERNEL);
3487         if (!buff)
3488                 return -ENOMEM;
3489
3490         for (i = 0; i < LQ_SIZE; i++) {
3491                 tbl = &(lq_sta->lq_info[i]);
3492                 rate = &tbl->rate;
3493                 desc += sprintf(buff+desc,
3494                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3495                                 "index=%d\n",
3496                                 lq_sta->active_tbl == i ? "*" : "x",
3497                                 rate->type,
3498                                 rate->sgi,
3499                                 is_ht20(rate) ? "20Mhz" :
3500                                 is_ht40(rate) ? "40Mhz" :
3501                                 is_ht80(rate) ? "80Mhz" : "ERR",
3502                                 rate->index);
3503                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3504                         desc += sprintf(buff+desc,
3505                                 "counter=%d success=%d %%=%d\n",
3506                                 tbl->win[j].counter,
3507                                 tbl->win[j].success_counter,
3508                                 tbl->win[j].success_ratio);
3509                 }
3510         }
3511         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3512         kfree(buff);
3513         return ret;
3514 }
3515
3516 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3517         .read = rs_sta_dbgfs_stats_table_read,
3518         .open = simple_open,
3519         .llseek = default_llseek,
3520 };
3521
3522 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3523                                               char __user *user_buf,
3524                                               size_t count, loff_t *ppos)
3525 {
3526         static const char * const column_name[] = {
3527                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3528                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3529                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3530                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3531                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3532                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3533                 [RS_COLUMN_MIMO2] = "MIMO2",
3534                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3535         };
3536
3537         static const char * const rate_name[] = {
3538                 [IWL_RATE_1M_INDEX] = "1M",
3539                 [IWL_RATE_2M_INDEX] = "2M",
3540                 [IWL_RATE_5M_INDEX] = "5.5M",
3541                 [IWL_RATE_11M_INDEX] = "11M",
3542                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3543                 [IWL_RATE_9M_INDEX] = "9M",
3544                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3545                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3546                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3547                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3548                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3549                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3550                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3551                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3552                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3553         };
3554
3555         char *buff, *pos, *endpos;
3556         int col, rate;
3557         ssize_t ret;
3558         struct iwl_lq_sta *lq_sta = file->private_data;
3559         struct rs_rate_stats *stats;
3560         static const size_t bufsz = 1024;
3561
3562         buff = kmalloc(bufsz, GFP_KERNEL);
3563         if (!buff)
3564                 return -ENOMEM;
3565
3566         pos = buff;
3567         endpos = pos + bufsz;
3568
3569         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3570         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3571                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3572         pos += scnprintf(pos, endpos - pos, "\n");
3573
3574         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3575                 pos += scnprintf(pos, endpos - pos,
3576                                  "%s,", column_name[col]);
3577
3578                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3579                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3580                         pos += scnprintf(pos, endpos - pos,
3581                                          "%llu/%llu,",
3582                                          stats->success,
3583                                          stats->total);
3584                 }
3585                 pos += scnprintf(pos, endpos - pos, "\n");
3586         }
3587
3588         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3589         kfree(buff);
3590         return ret;
3591 }
3592
3593 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3594                                                const char __user *user_buf,
3595                                                size_t count, loff_t *ppos)
3596 {
3597         struct iwl_lq_sta *lq_sta = file->private_data;
3598         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3599
3600         return count;
3601 }
3602
3603 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3604         .read = rs_sta_dbgfs_drv_tx_stats_read,
3605         .write = rs_sta_dbgfs_drv_tx_stats_write,
3606         .open = simple_open,
3607         .llseek = default_llseek,
3608 };
3609
3610 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3611                                        char __user *user_buf,
3612                                        size_t count, loff_t *ppos)
3613 {
3614         struct iwl_lq_sta *lq_sta = file->private_data;
3615         char buf[12];
3616         int bufsz = sizeof(buf);
3617         int pos = 0;
3618         static const char * const ss_force_name[] = {
3619                 [RS_SS_FORCE_NONE] = "none",
3620                 [RS_SS_FORCE_STBC] = "stbc",
3621                 [RS_SS_FORCE_BFER] = "bfer",
3622                 [RS_SS_FORCE_SISO] = "siso",
3623         };
3624
3625         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3626                          ss_force_name[lq_sta->pers.ss_force]);
3627         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3628 }
3629
3630 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3631                                         size_t count, loff_t *ppos)
3632 {
3633         struct iwl_mvm *mvm = lq_sta->pers.drv;
3634         int ret = 0;
3635
3636         if (!strncmp("none", buf, 4)) {
3637                 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3638         } else if (!strncmp("siso", buf, 4)) {
3639                 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3640         } else if (!strncmp("stbc", buf, 4)) {
3641                 if (lq_sta->stbc_capable) {
3642                         lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3643                 } else {
3644                         IWL_ERR(mvm,
3645                                 "can't force STBC. peer doesn't support\n");
3646                         ret = -EINVAL;
3647                 }
3648         } else if (!strncmp("bfer", buf, 4)) {
3649                 if (lq_sta->bfer_capable) {
3650                         lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3651                 } else {
3652                         IWL_ERR(mvm,
3653                                 "can't force BFER. peer doesn't support\n");
3654                         ret = -EINVAL;
3655                 }
3656         } else {
3657                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3658                 ret = -EINVAL;
3659         }
3660         return ret ?: count;
3661 }
3662
3663 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3664         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3665 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
3666                 if (!debugfs_create_file(#name, mode, parent, lq_sta,   \
3667                                          &iwl_dbgfs_##name##_ops))      \
3668                         goto err;                                       \
3669         } while (0)
3670
3671 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3672
3673 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
3674 {
3675         struct iwl_lq_sta *lq_sta = priv_sta;
3676         struct iwl_mvm_sta *mvmsta;
3677
3678         mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3679
3680         if (!mvmsta->vif)
3681                 return;
3682
3683         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3684                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
3685         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3686                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
3687         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3688                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3689         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3690                           &lq_sta->tx_agg_tid_en);
3691         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3692                           &lq_sta->pers.dbg_fixed_txp_reduction);
3693
3694         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3695         return;
3696 err:
3697         IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3698 }
3699
3700 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3701 {
3702 }
3703 #endif
3704
3705 /*
3706  * Initialization of rate scaling information is done by driver after
3707  * the station is added. Since mac80211 calls this function before a
3708  * station is added we ignore it.
3709  */
3710 static void rs_rate_init_stub(void *mvm_r,
3711                               struct ieee80211_supported_band *sband,
3712                               struct cfg80211_chan_def *chandef,
3713                               struct ieee80211_sta *sta, void *mvm_sta)
3714 {
3715 }
3716
3717 static const struct rate_control_ops rs_mvm_ops = {
3718         .name = RS_NAME,
3719         .tx_status = rs_mac80211_tx_status,
3720         .get_rate = rs_get_rate,
3721         .rate_init = rs_rate_init_stub,
3722         .alloc = rs_alloc,
3723         .free = rs_free,
3724         .alloc_sta = rs_alloc_sta,
3725         .free_sta = rs_free_sta,
3726         .rate_update = rs_rate_update,
3727 #ifdef CONFIG_MAC80211_DEBUGFS
3728         .add_sta_debugfs = rs_add_debugfs,
3729         .remove_sta_debugfs = rs_remove_debugfs,
3730 #endif
3731 };
3732
3733 int iwl_mvm_rate_control_register(void)
3734 {
3735         return ieee80211_rate_control_register(&rs_mvm_ops);
3736 }
3737
3738 void iwl_mvm_rate_control_unregister(void)
3739 {
3740         ieee80211_rate_control_unregister(&rs_mvm_ops);
3741 }
3742
3743 /**
3744  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3745  * Tx protection, according to this request and previous requests,
3746  * and send the LQ command.
3747  * @mvmsta: The station
3748  * @enable: Enable Tx protection?
3749  */
3750 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3751                           bool enable)
3752 {
3753         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3754
3755         lockdep_assert_held(&mvm->mutex);
3756
3757         if (enable) {
3758                 if (mvmsta->tx_protection == 0)
3759                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
3760                 mvmsta->tx_protection++;
3761         } else {
3762                 mvmsta->tx_protection--;
3763                 if (mvmsta->tx_protection == 0)
3764                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3765         }
3766
3767         return iwl_mvm_send_lq_cmd(mvm, lq, false);
3768 }