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

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