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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
   4  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of version 2 of the GNU General Public License as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  18  *
  19  * The full GNU General Public License is included in this distribution in the
  20  * file called LICENSE.
  21  *
  22  * Contact Information:
  23  *  Intel Linux Wireless <ilw@linux.intel.com>
  24  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  25  *
  26  *****************************************************************************/
  27 #include <linux/kernel.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/slab.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37 #include "rs.h"
  38 #include "fw-api.h"
  39 #include "sta.h"
  40 #include "iwl-op-mode.h"
  41 #include "mvm.h"
  42 #include "debugfs.h"
  43
  44 #define RS_NAME "iwl-mvm-rs"
  45
  46 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  47
  48 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
  49  * Use this macro when dealing with thresholds consts set as a percentage
  50  */
  51 #define RS_PERCENT(x) (128 * x)
  52
  53 static u8 rs_ht_to_legacy[] = {
  54         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  55         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  56         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  57         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  58         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  59         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  60         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  61         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  62         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  63         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  64 };
  65
  66 static const u8 ant_toggle_lookup[] = {
  67         [ANT_NONE] = ANT_NONE,
  68         [ANT_A] = ANT_B,
  69         [ANT_B] = ANT_C,
  70         [ANT_AB] = ANT_BC,
  71         [ANT_C] = ANT_A,
  72         [ANT_AC] = ANT_AB,
  73         [ANT_BC] = ANT_AC,
  74         [ANT_ABC] = ANT_ABC,
  75 };
  76
  77 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  78         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  79                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  80                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  81                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  82                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  83                                     IWL_RATE_##rp##M_INDEX,           \
  84                                     IWL_RATE_##rn##M_INDEX }
  85
  86 #define IWL_DECLARE_MCS_RATE(s)                                           \
  87         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
  88                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
  89                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
  90                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
  91                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
  92                                        IWL_RATE_INVM_INDEX,               \
  93                                        IWL_RATE_INVM_INDEX }
  94
  95 /*
  96  * Parameter order:
  97  *   rate, ht rate, prev rate, next rate
  98  *
  99  * If there isn't a valid next or previous rate then INV is used which
 100  * maps to IWL_RATE_INVALID
 101  *
 102  */
 103 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 104         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 105         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 106         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 107         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 108         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 109         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 110         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 111         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 112         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 113         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 114         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 115         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 116         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 117         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 118         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 119 };
 120
 121 enum rs_action {
 122         RS_ACTION_STAY = 0,
 123         RS_ACTION_DOWNSCALE = -1,
 124         RS_ACTION_UPSCALE = 1,
 125 };
 126
 127 enum rs_column_mode {
 128         RS_INVALID = 0,
 129         RS_LEGACY,
 130         RS_SISO,
 131         RS_MIMO2,
 132 };
 133
 134 #define MAX_NEXT_COLUMNS 7
 135 #define MAX_COLUMN_CHECKS 3
 136
 137 struct rs_tx_column;
 138
 139 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 140                                      struct ieee80211_sta *sta,
 141                                      struct iwl_scale_tbl_info *tbl,
 142                                      const struct rs_tx_column *next_col);
 143
 144 struct rs_tx_column {
 145         enum rs_column_mode mode;
 146         u8 ant;
 147         bool sgi;
 148         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 149         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 150 };
 151
 152 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 153                          struct iwl_scale_tbl_info *tbl,
 154                          const struct rs_tx_column *next_col)
 155 {
 156         return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
 157 }
 158
 159 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 160                           struct iwl_scale_tbl_info *tbl,
 161                           const struct rs_tx_column *next_col)
 162 {
 163         struct iwl_mvm_sta *mvmsta;
 164         struct iwl_mvm_vif *mvmvif;
 165
 166         if (!sta->ht_cap.ht_supported)
 167                 return false;
 168
 169         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 170                 return false;
 171
 172         if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
 173                 return false;
 174
 175         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 176                 return false;
 177
 178         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 179         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 180         if (iwl_mvm_vif_low_latency(mvmvif) && mvmsta->vif->p2p)
 181                 return false;
 182
 183         return true;
 184 }
 185
 186 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 187                           struct iwl_scale_tbl_info *tbl,
 188                           const struct rs_tx_column *next_col)
 189 {
 190         if (!sta->ht_cap.ht_supported)
 191                 return false;
 192
 193         return true;
 194 }
 195
 196 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 197                          struct iwl_scale_tbl_info *tbl,
 198                          const struct rs_tx_column *next_col)
 199 {
 200         struct rs_rate *rate = &tbl->rate;
 201         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 202         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 203
 204         if (is_ht20(rate) && (ht_cap->cap &
 205                              IEEE80211_HT_CAP_SGI_20))
 206                 return true;
 207         if (is_ht40(rate) && (ht_cap->cap &
 208                              IEEE80211_HT_CAP_SGI_40))
 209                 return true;
 210         if (is_ht80(rate) && (vht_cap->cap &
 211                              IEEE80211_VHT_CAP_SHORT_GI_80))
 212                 return true;
 213
 214         return false;
 215 }
 216
 217 static const struct rs_tx_column rs_tx_columns[] = {
 218         [RS_COLUMN_LEGACY_ANT_A] = {
 219                 .mode = RS_LEGACY,
 220                 .ant = ANT_A,
 221                 .next_columns = {
 222                         RS_COLUMN_LEGACY_ANT_B,
 223                         RS_COLUMN_SISO_ANT_A,
 224                         RS_COLUMN_MIMO2,
 225                         RS_COLUMN_INVALID,
 226                         RS_COLUMN_INVALID,
 227                         RS_COLUMN_INVALID,
 228                         RS_COLUMN_INVALID,
 229                 },
 230                 .checks = {
 231                         rs_ant_allow,
 232                 },
 233         },
 234         [RS_COLUMN_LEGACY_ANT_B] = {
 235                 .mode = RS_LEGACY,
 236                 .ant = ANT_B,
 237                 .next_columns = {
 238                         RS_COLUMN_LEGACY_ANT_A,
 239                         RS_COLUMN_SISO_ANT_B,
 240                         RS_COLUMN_MIMO2,
 241                         RS_COLUMN_INVALID,
 242                         RS_COLUMN_INVALID,
 243                         RS_COLUMN_INVALID,
 244                         RS_COLUMN_INVALID,
 245                 },
 246                 .checks = {
 247                         rs_ant_allow,
 248                 },
 249         },
 250         [RS_COLUMN_SISO_ANT_A] = {
 251                 .mode = RS_SISO,
 252                 .ant = ANT_A,
 253                 .next_columns = {
 254                         RS_COLUMN_SISO_ANT_B,
 255                         RS_COLUMN_MIMO2,
 256                         RS_COLUMN_SISO_ANT_A_SGI,
 257                         RS_COLUMN_LEGACY_ANT_A,
 258                         RS_COLUMN_LEGACY_ANT_B,
 259                         RS_COLUMN_INVALID,
 260                         RS_COLUMN_INVALID,
 261                 },
 262                 .checks = {
 263                         rs_siso_allow,
 264                         rs_ant_allow,
 265                 },
 266         },
 267         [RS_COLUMN_SISO_ANT_B] = {
 268                 .mode = RS_SISO,
 269                 .ant = ANT_B,
 270                 .next_columns = {
 271                         RS_COLUMN_SISO_ANT_A,
 272                         RS_COLUMN_MIMO2,
 273                         RS_COLUMN_SISO_ANT_B_SGI,
 274                         RS_COLUMN_LEGACY_ANT_A,
 275                         RS_COLUMN_LEGACY_ANT_B,
 276                         RS_COLUMN_INVALID,
 277                         RS_COLUMN_INVALID,
 278                 },
 279                 .checks = {
 280                         rs_siso_allow,
 281                         rs_ant_allow,
 282                 },
 283         },
 284         [RS_COLUMN_SISO_ANT_A_SGI] = {
 285                 .mode = RS_SISO,
 286                 .ant = ANT_A,
 287                 .sgi = true,
 288                 .next_columns = {
 289                         RS_COLUMN_SISO_ANT_B_SGI,
 290                         RS_COLUMN_MIMO2_SGI,
 291                         RS_COLUMN_SISO_ANT_A,
 292                         RS_COLUMN_LEGACY_ANT_A,
 293                         RS_COLUMN_LEGACY_ANT_B,
 294                         RS_COLUMN_INVALID,
 295                         RS_COLUMN_INVALID,
 296                 },
 297                 .checks = {
 298                         rs_siso_allow,
 299                         rs_ant_allow,
 300                         rs_sgi_allow,
 301                 },
 302         },
 303         [RS_COLUMN_SISO_ANT_B_SGI] = {
 304                 .mode = RS_SISO,
 305                 .ant = ANT_B,
 306                 .sgi = true,
 307                 .next_columns = {
 308                         RS_COLUMN_SISO_ANT_A_SGI,
 309                         RS_COLUMN_MIMO2_SGI,
 310                         RS_COLUMN_SISO_ANT_B,
 311                         RS_COLUMN_LEGACY_ANT_A,
 312                         RS_COLUMN_LEGACY_ANT_B,
 313                         RS_COLUMN_INVALID,
 314                         RS_COLUMN_INVALID,
 315                 },
 316                 .checks = {
 317                         rs_siso_allow,
 318                         rs_ant_allow,
 319                         rs_sgi_allow,
 320                 },
 321         },
 322         [RS_COLUMN_MIMO2] = {
 323                 .mode = RS_MIMO2,
 324                 .ant = ANT_AB,
 325                 .next_columns = {
 326                         RS_COLUMN_SISO_ANT_A,
 327                         RS_COLUMN_MIMO2_SGI,
 328                         RS_COLUMN_LEGACY_ANT_A,
 329                         RS_COLUMN_LEGACY_ANT_B,
 330                         RS_COLUMN_INVALID,
 331                         RS_COLUMN_INVALID,
 332                         RS_COLUMN_INVALID,
 333                 },
 334                 .checks = {
 335                         rs_mimo_allow,
 336                 },
 337         },
 338         [RS_COLUMN_MIMO2_SGI] = {
 339                 .mode = RS_MIMO2,
 340                 .ant = ANT_AB,
 341                 .sgi = true,
 342                 .next_columns = {
 343                         RS_COLUMN_SISO_ANT_A_SGI,
 344                         RS_COLUMN_MIMO2,
 345                         RS_COLUMN_LEGACY_ANT_A,
 346                         RS_COLUMN_LEGACY_ANT_B,
 347                         RS_COLUMN_INVALID,
 348                         RS_COLUMN_INVALID,
 349                         RS_COLUMN_INVALID,
 350                 },
 351                 .checks = {
 352                         rs_mimo_allow,
 353                         rs_sgi_allow,
 354                 },
 355         },
 356 };
 357
 358 static inline u8 rs_extract_rate(u32 rate_n_flags)
 359 {
 360         /* also works for HT because bits 7:6 are zero there */
 361         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 362 }
 363
 364 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 365 {
 366         int idx = 0;
 367
 368         if (rate_n_flags & RATE_MCS_HT_MSK) {
 369                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 370                 idx += IWL_RATE_MCS_0_INDEX;
 371
 372                 /* skip 9M not supported in HT*/
 373                 if (idx >= IWL_RATE_9M_INDEX)
 374                         idx += 1;
 375                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 376                         return idx;
 377         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 378                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 379                 idx += IWL_RATE_MCS_0_INDEX;
 380
 381                 /* skip 9M not supported in VHT*/
 382                 if (idx >= IWL_RATE_9M_INDEX)
 383                         idx++;
 384                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 385                         return idx;
 386         } else {
 387                 /* legacy rate format, search for match in table */
 388
 389                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 390                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 391                         if (iwl_rates[idx].plcp == legacy_rate)
 392                                 return idx;
 393         }
 394
 395         return IWL_RATE_INVALID;
 396 }
 397
 398 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 399                                   struct ieee80211_sta *sta,
 400                                   struct iwl_lq_sta *lq_sta,
 401                                   int tid);
 402 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 403                            struct ieee80211_sta *sta,
 404                            struct iwl_lq_sta *lq_sta,
 405                            const struct rs_rate *initial_rate);
 406 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 407
 408 /**
 409  * The following tables contain the expected throughput metrics for all rates
 410  *
 411  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 412  *
 413  * where invalid entries are zeros.
 414  *
 415  * CCK rates are only valid in legacy table and will only be used in G
 416  * (2.4 GHz) band.
 417  */
 418
 419 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 420         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 421 };
 422
 423 /* Expected TpT tables. 4 indexes:
 424  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 425  */
 426 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 427         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 428         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 429         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 430         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 431 };
 432
 433 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 434         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 435         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 436         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 437         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 438 };
 439
 440 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 441         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 442         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 443         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 444         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 445 };
 446
 447 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 448         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 449         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 450         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 451         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 452 };
 453
 454 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 455         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 456         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 457         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 458         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 459 };
 460
 461 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 462         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 463         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 464         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 465         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 466 };
 467
 468 /* mbps, mcs */
 469 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 470         {  "1", "BPSK DSSS"},
 471         {  "2", "QPSK DSSS"},
 472         {"5.5", "BPSK CCK"},
 473         { "11", "QPSK CCK"},
 474         {  "6", "BPSK 1/2"},
 475         {  "9", "BPSK 1/2"},
 476         { "12", "QPSK 1/2"},
 477         { "18", "QPSK 3/4"},
 478         { "24", "16QAM 1/2"},
 479         { "36", "16QAM 3/4"},
 480         { "48", "64QAM 2/3"},
 481         { "54", "64QAM 3/4"},
 482         { "60", "64QAM 5/6"},
 483 };
 484
 485 #define MCS_INDEX_PER_STREAM    (8)
 486
 487 static const char *rs_pretty_ant(u8 ant)
 488 {
 489         static const char * const ant_name[] = {
 490                 [ANT_NONE] = "None",
 491                 [ANT_A]    = "A",
 492                 [ANT_B]    = "B",
 493                 [ANT_AB]   = "AB",
 494                 [ANT_C]    = "C",
 495                 [ANT_AC]   = "AC",
 496                 [ANT_BC]   = "BC",
 497                 [ANT_ABC]  = "ABC",
 498         };
 499
 500         if (ant > ANT_ABC)
 501                 return "UNKNOWN";
 502
 503         return ant_name[ant];
 504 }
 505
 506 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 507 {
 508         static const char * const lq_types[] = {
 509                 [LQ_NONE] = "NONE",
 510                 [LQ_LEGACY_A] = "LEGACY_A",
 511                 [LQ_LEGACY_G] = "LEGACY_G",
 512                 [LQ_HT_SISO] = "HT SISO",
 513                 [LQ_HT_MIMO2] = "HT MIMO",
 514                 [LQ_VHT_SISO] = "VHT SISO",
 515                 [LQ_VHT_MIMO2] = "VHT MIMO",
 516         };
 517
 518         if (type < LQ_NONE || type >= LQ_MAX)
 519                 return "UNKNOWN";
 520
 521         return lq_types[type];
 522 }
 523
 524 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 525                                 const char *prefix)
 526 {
 527         IWL_DEBUG_RATE(mvm,
 528                        "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
 529                        prefix, rs_pretty_lq_type(rate->type),
 530                        rate->index, rs_pretty_ant(rate->ant),
 531                        rate->bw, rate->sgi, rate->ldpc, rate->stbc);
 532 }
 533
 534 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 535 {
 536         window->data = 0;
 537         window->success_counter = 0;
 538         window->success_ratio = IWL_INVALID_VALUE;
 539         window->counter = 0;
 540         window->average_tpt = IWL_INVALID_VALUE;
 541 }
 542
 543 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 544                                             struct iwl_scale_tbl_info *tbl)
 545 {
 546         int i;
 547
 548         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 549         for (i = 0; i < IWL_RATE_COUNT; i++)
 550                 rs_rate_scale_clear_window(&tbl->win[i]);
 551
 552         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 553                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 554 }
 555
 556 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 557 {
 558         return (ant_type & valid_antenna) == ant_type;
 559 }
 560
 561 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 562                                       struct iwl_lq_sta *lq_data, u8 tid,
 563                                       struct ieee80211_sta *sta)
 564 {
 565         int ret = -EAGAIN;
 566
 567         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 568                      sta->addr, tid);
 569         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 570         if (ret == -EAGAIN) {
 571                 /*
 572                  * driver and mac80211 is out of sync
 573                  * this might be cause by reloading firmware
 574                  * stop the tx ba session here
 575                  */
 576                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 577                         tid);
 578                 ieee80211_stop_tx_ba_session(sta, tid);
 579         }
 580         return ret;
 581 }
 582
 583 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 584                               struct iwl_lq_sta *lq_data,
 585                               struct ieee80211_sta *sta)
 586 {
 587         if (tid < IWL_MAX_TID_COUNT)
 588                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 589         else
 590                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 591                         tid, IWL_MAX_TID_COUNT);
 592 }
 593
 594 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 595 {
 596         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 597                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 598                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 599 }
 600
 601 /*
 602  * Static function to get the expected throughput from an iwl_scale_tbl_info
 603  * that wraps a NULL pointer check
 604  */
 605 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 606 {
 607         if (tbl->expected_tpt)
 608                 return tbl->expected_tpt[rs_index];
 609         return 0;
 610 }
 611
 612 /**
 613  * rs_collect_tx_data - Update the success/failure sliding window
 614  *
 615  * We keep a sliding window of the last 62 packets transmitted
 616  * at this rate.  window->data contains the bitmask of successful
 617  * packets.
 618  */
 619 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
 620                                struct iwl_scale_tbl_info *tbl,
 621                                int scale_index, int attempts, int successes,
 622                                struct iwl_rate_scale_data *window)
 623 {
 624         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 625         s32 fail_count, tpt;
 626
 627         /* Get expected throughput */
 628         tpt = get_expected_tpt(tbl, scale_index);
 629
 630         /*
 631          * Keep track of only the latest 62 tx frame attempts in this rate's
 632          * history window; anything older isn't really relevant any more.
 633          * If we have filled up the sliding window, drop the oldest attempt;
 634          * if the oldest attempt (highest bit in bitmap) shows "success",
 635          * subtract "1" from the success counter (this is the main reason
 636          * we keep these bitmaps!).
 637          */
 638         while (attempts > 0) {
 639                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 640                         /* remove earliest */
 641                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 642
 643                         if (window->data & mask) {
 644                                 window->data &= ~mask;
 645                                 window->success_counter--;
 646                         }
 647                 }
 648
 649                 /* Increment frames-attempted counter */
 650                 window->counter++;
 651
 652                 /* Shift bitmap by one frame to throw away oldest history */
 653                 window->data <<= 1;
 654
 655                 /* Mark the most recent #successes attempts as successful */
 656                 if (successes > 0) {
 657                         window->success_counter++;
 658                         window->data |= 0x1;
 659                         successes--;
 660                 }
 661
 662                 attempts--;
 663         }
 664
 665         /* Calculate current success ratio, avoid divide-by-0! */
 666         if (window->counter > 0)
 667                 window->success_ratio = 128 * (100 * window->success_counter)
 668                                         / window->counter;
 669         else
 670                 window->success_ratio = IWL_INVALID_VALUE;
 671
 672         fail_count = window->counter - window->success_counter;
 673
 674         /* Calculate average throughput, if we have enough history. */
 675         if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
 676             (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
 677                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 678         else
 679                 window->average_tpt = IWL_INVALID_VALUE;
 680
 681         return 0;
 682 }
 683
 684 static int rs_collect_tx_data(struct iwl_mvm *mvm,
 685                               struct iwl_lq_sta *lq_sta,
 686                               struct iwl_scale_tbl_info *tbl,
 687                               int scale_index, int attempts, int successes,
 688                               u8 reduced_txp)
 689 {
 690         struct iwl_rate_scale_data *window = NULL;
 691         int ret;
 692
 693         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 694                 return -EINVAL;
 695
 696         if (tbl->column != RS_COLUMN_INVALID) {
 697                 struct lq_sta_pers *pers = &lq_sta->pers;
 698
 699                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 700                 pers->tx_stats[tbl->column][scale_index].success += successes;
 701         }
 702
 703         /* Select window for current tx bit rate */
 704         window = &(tbl->win[scale_index]);
 705
 706         ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 707                                   window);
 708         if (ret)
 709                 return ret;
 710
 711         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 712                 return -EINVAL;
 713
 714         window = &tbl->tpc_win[reduced_txp];
 715         return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 716                                    window);
 717 }
 718
 719 /* Convert rs_rate object into ucode rate bitmask */
 720 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 721                                   struct rs_rate *rate)
 722 {
 723         u32 ucode_rate = 0;
 724         int index = rate->index;
 725
 726         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 727                          RATE_MCS_ANT_ABC_MSK);
 728
 729         if (is_legacy(rate)) {
 730                 ucode_rate |= iwl_rates[index].plcp;
 731                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 732                         ucode_rate |= RATE_MCS_CCK_MSK;
 733                 return ucode_rate;
 734         }
 735
 736         if (is_ht(rate)) {
 737                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 738                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 739                         index = IWL_LAST_HT_RATE;
 740                 }
 741                 ucode_rate |= RATE_MCS_HT_MSK;
 742
 743                 if (is_ht_siso(rate))
 744                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 745                 else if (is_ht_mimo2(rate))
 746                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 747                 else
 748                         WARN_ON_ONCE(1);
 749         } else if (is_vht(rate)) {
 750                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 751                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 752                         index = IWL_LAST_VHT_RATE;
 753                 }
 754                 ucode_rate |= RATE_MCS_VHT_MSK;
 755                 if (is_vht_siso(rate))
 756                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 757                 else if (is_vht_mimo2(rate))
 758                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 759                 else
 760                         WARN_ON_ONCE(1);
 761
 762         } else {
 763                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 764         }
 765
 766         if (is_siso(rate) && rate->stbc) {
 767                 /* To enable STBC we need to set both a flag and ANT_AB */
 768                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 769                 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
 770         }
 771
 772         ucode_rate |= rate->bw;
 773         if (rate->sgi)
 774                 ucode_rate |= RATE_MCS_SGI_MSK;
 775         if (rate->ldpc)
 776                 ucode_rate |= RATE_MCS_LDPC_MSK;
 777
 778         return ucode_rate;
 779 }
 780
 781 /* Convert a ucode rate into an rs_rate object */
 782 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 783                                    enum ieee80211_band band,
 784                                    struct rs_rate *rate)
 785 {
 786         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 787         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 788         u8 nss;
 789
 790         memset(rate, 0, sizeof(*rate));
 791         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 792
 793         if (rate->index == IWL_RATE_INVALID)
 794                 return -EINVAL;
 795
 796         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 797
 798         /* Legacy */
 799         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 800             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 801                 if (num_of_ant == 1) {
 802                         if (band == IEEE80211_BAND_5GHZ)
 803                                 rate->type = LQ_LEGACY_A;
 804                         else
 805                                 rate->type = LQ_LEGACY_G;
 806                 }
 807
 808                 return 0;
 809         }
 810
 811         /* HT or VHT */
 812         if (ucode_rate & RATE_MCS_SGI_MSK)
 813                 rate->sgi = true;
 814         if (ucode_rate & RATE_MCS_LDPC_MSK)
 815                 rate->ldpc = true;
 816         if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
 817                 rate->stbc = true;
 818         if (ucode_rate & RATE_MCS_BF_MSK)
 819                 rate->bfer = true;
 820
 821         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 822
 823         if (ucode_rate & RATE_MCS_HT_MSK) {
 824                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 825                        RATE_HT_MCS_NSS_POS) + 1;
 826
 827                 if (nss == 1) {
 828                         rate->type = LQ_HT_SISO;
 829                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 830                                   "stbc %d bfer %d",
 831                                   rate->stbc, rate->bfer);
 832                 } else if (nss == 2) {
 833                         rate->type = LQ_HT_MIMO2;
 834                         WARN_ON_ONCE(num_of_ant != 2);
 835                 } else {
 836                         WARN_ON_ONCE(1);
 837                 }
 838         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 839                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 840                        RATE_VHT_MCS_NSS_POS) + 1;
 841
 842                 if (nss == 1) {
 843                         rate->type = LQ_VHT_SISO;
 844                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 845                                   "stbc %d bfer %d",
 846                                   rate->stbc, rate->bfer);
 847                 } else if (nss == 2) {
 848                         rate->type = LQ_VHT_MIMO2;
 849                         WARN_ON_ONCE(num_of_ant != 2);
 850                 } else {
 851                         WARN_ON_ONCE(1);
 852                 }
 853         }
 854
 855         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
 856         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 857                      !is_vht(rate));
 858
 859         return 0;
 860 }
 861
 862 /* switch to another antenna/antennas and return 1 */
 863 /* if no other valid antenna found, return 0 */
 864 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 865 {
 866         u8 new_ant_type;
 867
 868         if (!rate->ant || rate->ant > ANT_ABC)
 869                 return 0;
 870
 871         if (!rs_is_valid_ant(valid_ant, rate->ant))
 872                 return 0;
 873
 874         new_ant_type = ant_toggle_lookup[rate->ant];
 875
 876         while ((new_ant_type != rate->ant) &&
 877                !rs_is_valid_ant(valid_ant, new_ant_type))
 878                 new_ant_type = ant_toggle_lookup[new_ant_type];
 879
 880         if (new_ant_type == rate->ant)
 881                 return 0;
 882
 883         rate->ant = new_ant_type;
 884
 885         return 1;
 886 }
 887
 888 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 889                                   struct rs_rate *rate)
 890 {
 891         if (is_legacy(rate))
 892                 return lq_sta->active_legacy_rate;
 893         else if (is_siso(rate))
 894                 return lq_sta->active_siso_rate;
 895         else if (is_mimo2(rate))
 896                 return lq_sta->active_mimo2_rate;
 897
 898         WARN_ON_ONCE(1);
 899         return 0;
 900 }
 901
 902 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 903                                 int rate_type)
 904 {
 905         u8 high = IWL_RATE_INVALID;
 906         u8 low = IWL_RATE_INVALID;
 907
 908         /* 802.11A or ht walks to the next literal adjacent rate in
 909          * the rate table */
 910         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 911                 int i;
 912                 u32 mask;
 913
 914                 /* Find the previous rate that is in the rate mask */
 915                 i = index - 1;
 916                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 917                         if (rate_mask & mask) {
 918                                 low = i;
 919                                 break;
 920                         }
 921                 }
 922
 923                 /* Find the next rate that is in the rate mask */
 924                 i = index + 1;
 925                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 926                         if (rate_mask & mask) {
 927                                 high = i;
 928                                 break;
 929                         }
 930                 }
 931
 932                 return (high << 8) | low;
 933         }
 934
 935         low = index;
 936         while (low != IWL_RATE_INVALID) {
 937                 low = iwl_rates[low].prev_rs;
 938                 if (low == IWL_RATE_INVALID)
 939                         break;
 940                 if (rate_mask & (1 << low))
 941                         break;
 942         }
 943
 944         high = index;
 945         while (high != IWL_RATE_INVALID) {
 946                 high = iwl_rates[high].next_rs;
 947                 if (high == IWL_RATE_INVALID)
 948                         break;
 949                 if (rate_mask & (1 << high))
 950                         break;
 951         }
 952
 953         return (high << 8) | low;
 954 }
 955
 956 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
 957                                      struct rs_rate *rate)
 958 {
 959         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
 960 }
 961
 962 /* Get the next supported lower rate in the current column.
 963  * Return true if bottom rate in the current column was reached
 964  */
 965 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
 966                                         struct rs_rate *rate)
 967 {
 968         u8 low;
 969         u16 high_low;
 970         u16 rate_mask;
 971         struct iwl_mvm *mvm = lq_sta->pers.drv;
 972
 973         rate_mask = rs_get_supported_rates(lq_sta, rate);
 974         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
 975                                         rate->type);
 976         low = high_low & 0xff;
 977
 978         /* Bottom rate of column reached */
 979         if (low == IWL_RATE_INVALID)
 980                 return true;
 981
 982         rate->index = low;
 983         return false;
 984 }
 985
 986 /* Get the next rate to use following a column downgrade */
 987 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
 988                                           struct rs_rate *rate)
 989 {
 990         struct iwl_mvm *mvm = lq_sta->pers.drv;
 991
 992         if (is_legacy(rate)) {
 993                 /* No column to downgrade from Legacy */
 994                 return;
 995         } else if (is_siso(rate)) {
 996                 /* Downgrade to Legacy if we were in SISO */
 997                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 998                         rate->type = LQ_LEGACY_A;
 999                 else
1000                         rate->type = LQ_LEGACY_G;
1001
1002                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1003
1004                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1005                              rate->index > IWL_RATE_MCS_9_INDEX);
1006
1007                 rate->index = rs_ht_to_legacy[rate->index];
1008                 rate->ldpc = false;
1009         } else {
1010                 /* Downgrade to SISO with same MCS if in MIMO  */
1011                 rate->type = is_vht_mimo2(rate) ?
1012                         LQ_VHT_SISO : LQ_HT_SISO;
1013         }
1014
1015         if (num_of_ant(rate->ant) > 1)
1016                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1017
1018         /* Relevant in both switching to SISO or Legacy */
1019         rate->sgi = false;
1020
1021         if (!rs_rate_supported(lq_sta, rate))
1022                 rs_get_lower_rate_in_column(lq_sta, rate);
1023 }
1024
1025 /* Check if both rates are identical
1026  * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1027  * with a rate indicating STBC/BFER and ANT_AB.
1028  */
1029 static inline bool rs_rate_equal(struct rs_rate *a,
1030                                  struct rs_rate *b,
1031                                  bool allow_ant_mismatch)
1032
1033 {
1034         bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1035                 (a->bfer == b->bfer);
1036
1037         if (allow_ant_mismatch) {
1038                 if (a->stbc || a->bfer) {
1039                         WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1040                                   a->stbc, a->bfer, a->ant);
1041                         ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1042                 } else if (b->stbc || b->bfer) {
1043                         WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1044                                   b->stbc, b->bfer, b->ant);
1045                         ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1046                 }
1047         }
1048
1049         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1050                 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1051 }
1052
1053 /* Check if both rates share the same column */
1054 static inline bool rs_rate_column_match(struct rs_rate *a,
1055                                         struct rs_rate *b)
1056 {
1057         bool ant_match;
1058
1059         if (a->stbc || a->bfer)
1060                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1061         else
1062                 ant_match = (a->ant == b->ant);
1063
1064         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1065                 && ant_match;
1066 }
1067
1068 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1069 {
1070         if (is_legacy(rate)) {
1071                 if (rate->ant == ANT_A)
1072                         return RS_COLUMN_LEGACY_ANT_A;
1073
1074                 if (rate->ant == ANT_B)
1075                         return RS_COLUMN_LEGACY_ANT_B;
1076
1077                 goto err;
1078         }
1079
1080         if (is_siso(rate)) {
1081                 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1082                         return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1083                                 RS_COLUMN_SISO_ANT_A;
1084
1085                 if (rate->ant == ANT_B)
1086                         return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1087                                 RS_COLUMN_SISO_ANT_B;
1088
1089                 goto err;
1090         }
1091
1092         if (is_mimo(rate))
1093                 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1094
1095 err:
1096         return RS_COLUMN_INVALID;
1097 }
1098
1099 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1100 {
1101         u8 tid = IWL_MAX_TID_COUNT;
1102
1103         if (ieee80211_is_data_qos(hdr->frame_control)) {
1104                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1105                 tid = qc[0] & 0xf;
1106         }
1107
1108         if (unlikely(tid > IWL_MAX_TID_COUNT))
1109                 tid = IWL_MAX_TID_COUNT;
1110
1111         return tid;
1112 }
1113
1114 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1115                           int tid, struct ieee80211_tx_info *info)
1116 {
1117         int legacy_success;
1118         int retries;
1119         int i;
1120         struct iwl_lq_cmd *table;
1121         u32 lq_hwrate;
1122         struct rs_rate lq_rate, tx_resp_rate;
1123         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1124         u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1125         u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1126         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1127         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1128         bool allow_ant_mismatch = mvm->fw->ucode_capa.api[0] &
1129                 IWL_UCODE_TLV_API_LQ_SS_PARAMS;
1130
1131         /* Treat uninitialized rate scaling data same as non-existing. */
1132         if (!lq_sta) {
1133                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1134                 return;
1135         } else if (!lq_sta->pers.drv) {
1136                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1137                 return;
1138         }
1139
1140         /* This packet was aggregated but doesn't carry status info */
1141         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1142             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1143                 return;
1144
1145         rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1146
1147 #ifdef CONFIG_MAC80211_DEBUGFS
1148         /* Disable last tx check if we are debugging with fixed rate but
1149          * update tx stats */
1150         if (lq_sta->pers.dbg_fixed_rate) {
1151                 int index = tx_resp_rate.index;
1152                 enum rs_column column;
1153                 int attempts, success;
1154
1155                 column = rs_get_column_from_rate(&tx_resp_rate);
1156                 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1157                               "Can't map rate 0x%x to column",
1158                               tx_resp_hwrate))
1159                         return;
1160
1161                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1162                         attempts = info->status.ampdu_len;
1163                         success = info->status.ampdu_ack_len;
1164                 } else {
1165                         attempts = info->status.rates[0].count;
1166                         success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1167                 }
1168
1169                 lq_sta->pers.tx_stats[column][index].total += attempts;
1170                 lq_sta->pers.tx_stats[column][index].success += success;
1171
1172                 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1173                                tx_resp_hwrate, success, attempts);
1174                 return;
1175         }
1176 #endif
1177
1178         if (time_after(jiffies,
1179                        (unsigned long)(lq_sta->last_tx +
1180                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1181                 int t;
1182
1183                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1184                 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1185                         ieee80211_stop_tx_ba_session(sta, t);
1186
1187                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1188                 return;
1189         }
1190         lq_sta->last_tx = jiffies;
1191
1192         /* Ignore this Tx frame response if its initial rate doesn't match
1193          * that of latest Link Quality command.  There may be stragglers
1194          * from a previous Link Quality command, but we're no longer interested
1195          * in those; they're either from the "active" mode while we're trying
1196          * to check "search" mode, or a prior "search" mode after we've moved
1197          * to a new "search" mode (which might become the new "active" mode).
1198          */
1199         table = &lq_sta->lq;
1200         lq_hwrate = le32_to_cpu(table->rs_table[0]);
1201         rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1202
1203         /* Here we actually compare this rate to the latest LQ command */
1204         if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1205                 IWL_DEBUG_RATE(mvm,
1206                                "initial tx resp rate 0x%x does not match 0x%x\n",
1207                                tx_resp_hwrate, lq_hwrate);
1208
1209                 /*
1210                  * Since rates mis-match, the last LQ command may have failed.
1211                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1212                  * ... driver.
1213                  */
1214                 lq_sta->missed_rate_counter++;
1215                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1216                         lq_sta->missed_rate_counter = 0;
1217                         IWL_DEBUG_RATE(mvm,
1218                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1219                                        lq_sta->rs_state);
1220                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1221                 }
1222                 /* Regardless, ignore this status info for outdated rate */
1223                 return;
1224         } else
1225                 /* Rate did match, so reset the missed_rate_counter */
1226                 lq_sta->missed_rate_counter = 0;
1227
1228         if (!lq_sta->search_better_tbl) {
1229                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1230                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1231         } else {
1232                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1233                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1234         }
1235
1236         if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1237                 IWL_DEBUG_RATE(mvm,
1238                                "Neither active nor search matches tx rate\n");
1239                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1240                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1241                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1242                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1243                 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1244
1245                 /*
1246                  * no matching table found, let's by-pass the data collection
1247                  * and continue to perform rate scale to find the rate table
1248                  */
1249                 rs_stay_in_table(lq_sta, true);
1250                 goto done;
1251         }
1252
1253         /*
1254          * Updating the frame history depends on whether packets were
1255          * aggregated.
1256          *
1257          * For aggregation, all packets were transmitted at the same rate, the
1258          * first index into rate scale table.
1259          */
1260         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1261                 /* ampdu_ack_len = 0 marks no BA was received. In this case
1262                  * treat it as a single frame loss as we don't want the success
1263                  * ratio to dip too quickly because a BA wasn't received
1264                  */
1265                 if (info->status.ampdu_ack_len == 0)
1266                         info->status.ampdu_len = 1;
1267
1268                 rs_collect_tx_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1269                                    info->status.ampdu_len,
1270                                    info->status.ampdu_ack_len,
1271                                    reduced_txp);
1272
1273                 /* Update success/fail counts if not searching for new mode */
1274                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1275                         lq_sta->total_success += info->status.ampdu_ack_len;
1276                         lq_sta->total_failed += (info->status.ampdu_len -
1277                                         info->status.ampdu_ack_len);
1278                 }
1279         } else {
1280         /*
1281          * For legacy, update frame history with for each Tx retry.
1282          */
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 (!ieee80211_is_data(hdr->frame_control) ||
1340             info->flags & IEEE80211_TX_CTL_NO_ACK)
1341                 return;
1342
1343         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1344 }
1345
1346 /*
1347  * Begin a period of staying with a selected modulation mode.
1348  * Set "stay_in_tbl" flag to prevent any mode switches.
1349  * Set frame tx success limits according to legacy vs. high-throughput,
1350  * and reset overall (spanning all rates) tx success history statistics.
1351  * These control how long we stay using same modulation mode before
1352  * searching for a new mode.
1353  */
1354 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1355                                  struct iwl_lq_sta *lq_sta)
1356 {
1357         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1358         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1359         if (is_legacy) {
1360                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1361                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1362                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1363         } else {
1364                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1365                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1366                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1367         }
1368         lq_sta->table_count = 0;
1369         lq_sta->total_failed = 0;
1370         lq_sta->total_success = 0;
1371         lq_sta->flush_timer = jiffies;
1372         lq_sta->visited_columns = 0;
1373 }
1374
1375 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1376 {
1377         if (rate_mask)
1378                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1379         return IWL_RATE_INVALID;
1380 }
1381
1382 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1383                                    const struct rs_tx_column *column)
1384 {
1385         switch (column->mode) {
1386         case RS_LEGACY:
1387                 return lq_sta->max_legacy_rate_idx;
1388         case RS_SISO:
1389                 return lq_sta->max_siso_rate_idx;
1390         case RS_MIMO2:
1391                 return lq_sta->max_mimo2_rate_idx;
1392         default:
1393                 WARN_ON_ONCE(1);
1394         }
1395
1396         return lq_sta->max_legacy_rate_idx;
1397 }
1398
1399 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1400                                             const struct rs_tx_column *column,
1401                                             u32 bw)
1402 {
1403         /* Used to choose among HT tables */
1404         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1405
1406         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1407                          column->mode != RS_SISO &&
1408                          column->mode != RS_MIMO2))
1409                 return expected_tpt_legacy;
1410
1411         /* Legacy rates have only one table */
1412         if (column->mode == RS_LEGACY)
1413                 return expected_tpt_legacy;
1414
1415         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1416         /* Choose among many HT tables depending on number of streams
1417          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1418          * status */
1419         if (column->mode == RS_SISO) {
1420                 switch (bw) {
1421                 case RATE_MCS_CHAN_WIDTH_20:
1422                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1423                         break;
1424                 case RATE_MCS_CHAN_WIDTH_40:
1425                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1426                         break;
1427                 case RATE_MCS_CHAN_WIDTH_80:
1428                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1429                         break;
1430                 default:
1431                         WARN_ON_ONCE(1);
1432                 }
1433         } else if (column->mode == RS_MIMO2) {
1434                 switch (bw) {
1435                 case RATE_MCS_CHAN_WIDTH_20:
1436                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1437                         break;
1438                 case RATE_MCS_CHAN_WIDTH_40:
1439                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1440                         break;
1441                 case RATE_MCS_CHAN_WIDTH_80:
1442                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1443                         break;
1444                 default:
1445                         WARN_ON_ONCE(1);
1446                 }
1447         } else {
1448                 WARN_ON_ONCE(1);
1449         }
1450
1451         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1452                 return ht_tbl_pointer[0];
1453         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1454                 return ht_tbl_pointer[1];
1455         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1456                 return ht_tbl_pointer[2];
1457         else                                            /* AGG+SGI */
1458                 return ht_tbl_pointer[3];
1459 }
1460
1461 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1462                                       struct iwl_scale_tbl_info *tbl)
1463 {
1464         struct rs_rate *rate = &tbl->rate;
1465         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1466
1467         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1468 }
1469
1470 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1471                             struct iwl_lq_sta *lq_sta,
1472                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1473                             unsigned long rate_mask, s8 index)
1474 {
1475         struct iwl_scale_tbl_info *active_tbl =
1476             &(lq_sta->lq_info[lq_sta->active_tbl]);
1477         s32 success_ratio = active_tbl->win[index].success_ratio;
1478         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1479         const u16 *tpt_tbl = tbl->expected_tpt;
1480         u16 high_low;
1481         u32 target_tpt;
1482         int rate_idx;
1483
1484         if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) {
1485                 target_tpt = 100 * expected_current_tpt;
1486                 IWL_DEBUG_RATE(mvm,
1487                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1488                                success_ratio, target_tpt);
1489         } else {
1490                 target_tpt = lq_sta->last_tpt;
1491                 IWL_DEBUG_RATE(mvm,
1492                                "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1493                                success_ratio, target_tpt);
1494         }
1495
1496         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1497
1498         while (rate_idx != IWL_RATE_INVALID) {
1499                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1500                         break;
1501
1502                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1503                                                 tbl->rate.type);
1504
1505                 rate_idx = (high_low >> 8) & 0xff;
1506         }
1507
1508         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1509                        rate_idx, target_tpt,
1510                        rate_idx != IWL_RATE_INVALID ?
1511                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1512
1513         return rate_idx;
1514 }
1515
1516 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1517 {
1518         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1519                 return RATE_MCS_CHAN_WIDTH_80;
1520         else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1521                 return RATE_MCS_CHAN_WIDTH_40;
1522
1523         return RATE_MCS_CHAN_WIDTH_20;
1524 }
1525
1526 /*
1527  * Check whether we should continue using same modulation mode, or
1528  * begin search for a new mode, based on:
1529  * 1) # tx successes or failures while using this mode
1530  * 2) # times calling this function
1531  * 3) elapsed time in this mode (not used, for now)
1532  */
1533 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1534 {
1535         struct iwl_scale_tbl_info *tbl;
1536         int active_tbl;
1537         int flush_interval_passed = 0;
1538         struct iwl_mvm *mvm;
1539
1540         mvm = lq_sta->pers.drv;
1541         active_tbl = lq_sta->active_tbl;
1542
1543         tbl = &(lq_sta->lq_info[active_tbl]);
1544
1545         /* If we've been disallowing search, see if we should now allow it */
1546         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1547                 /* Elapsed time using current modulation mode */
1548                 if (lq_sta->flush_timer)
1549                         flush_interval_passed =
1550                                 time_after(jiffies,
1551                                            (unsigned long)(lq_sta->flush_timer +
1552                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1553
1554                 /*
1555                  * Check if we should allow search for new modulation mode.
1556                  * If many frames have failed or succeeded, or we've used
1557                  * this same modulation for a long time, allow search, and
1558                  * reset history stats that keep track of whether we should
1559                  * allow a new search.  Also (below) reset all bitmaps and
1560                  * stats in active history.
1561                  */
1562                 if (force_search ||
1563                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1564                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1565                     ((!lq_sta->search_better_tbl) &&
1566                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1567                         IWL_DEBUG_RATE(mvm,
1568                                        "LQ: stay is expired %d %d %d\n",
1569                                      lq_sta->total_failed,
1570                                      lq_sta->total_success,
1571                                      flush_interval_passed);
1572
1573                         /* Allow search for new mode */
1574                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1575                         IWL_DEBUG_RATE(mvm,
1576                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1577                         lq_sta->total_failed = 0;
1578                         lq_sta->total_success = 0;
1579                         lq_sta->flush_timer = 0;
1580                         /* mark the current column as visited */
1581                         lq_sta->visited_columns = BIT(tbl->column);
1582                 /*
1583                  * Else if we've used this modulation mode enough repetitions
1584                  * (regardless of elapsed time or success/failure), reset
1585                  * history bitmaps and rate-specific stats for all rates in
1586                  * active table.
1587                  */
1588                 } else {
1589                         lq_sta->table_count++;
1590                         if (lq_sta->table_count >=
1591                             lq_sta->table_count_limit) {
1592                                 lq_sta->table_count = 0;
1593
1594                                 IWL_DEBUG_RATE(mvm,
1595                                                "LQ: stay in table clear win\n");
1596                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1597                         }
1598                 }
1599
1600                 /* If transitioning to allow "search", reset all history
1601                  * bitmaps and stats in active table (this will become the new
1602                  * "search" table). */
1603                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1604                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1605                 }
1606         }
1607 }
1608
1609 /*
1610  * setup rate table in uCode
1611  */
1612 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1613                                struct ieee80211_sta *sta,
1614                                struct iwl_lq_sta *lq_sta,
1615                                struct rs_rate *rate)
1616 {
1617         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
1618         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1619 }
1620
1621 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1622                                          struct iwl_lq_sta *lq_sta,
1623                                          struct ieee80211_sta *sta,
1624                                          struct iwl_scale_tbl_info *tbl)
1625 {
1626         int i, j, max_rate;
1627         enum rs_column next_col_id;
1628         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1629         const struct rs_tx_column *next_col;
1630         allow_column_func_t allow_func;
1631         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1632         const u16 *expected_tpt_tbl;
1633         u16 tpt, max_expected_tpt;
1634
1635         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1636                 next_col_id = curr_col->next_columns[i];
1637
1638                 if (next_col_id == RS_COLUMN_INVALID)
1639                         continue;
1640
1641                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1642                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1643                                        next_col_id);
1644                         continue;
1645                 }
1646
1647                 next_col = &rs_tx_columns[next_col_id];
1648
1649                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1650                         IWL_DEBUG_RATE(mvm,
1651                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1652                                        next_col_id, valid_ants, next_col->ant);
1653                         continue;
1654                 }
1655
1656                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1657                         allow_func = next_col->checks[j];
1658                         if (allow_func && !allow_func(mvm, sta, tbl, next_col))
1659                                 break;
1660                 }
1661
1662                 if (j != MAX_COLUMN_CHECKS) {
1663                         IWL_DEBUG_RATE(mvm,
1664                                        "Skip column %d: not allowed (check %d failed)\n",
1665                                        next_col_id, j);
1666
1667                         continue;
1668                 }
1669
1670                 tpt = lq_sta->last_tpt / 100;
1671                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1672                                                      rs_bw_from_sta_bw(sta));
1673                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1674                         continue;
1675
1676                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1677                 if (max_rate == IWL_RATE_INVALID) {
1678                         IWL_DEBUG_RATE(mvm,
1679                                        "Skip column %d: no rate is allowed in this column\n",
1680                                        next_col_id);
1681                         continue;
1682                 }
1683
1684                 max_expected_tpt = expected_tpt_tbl[max_rate];
1685                 if (tpt >= max_expected_tpt) {
1686                         IWL_DEBUG_RATE(mvm,
1687                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1688                                        next_col_id, max_expected_tpt, tpt);
1689                         continue;
1690                 }
1691
1692                 IWL_DEBUG_RATE(mvm,
1693                                "Found potential column %d. Max expected %d current %d\n",
1694                                next_col_id, max_expected_tpt, tpt);
1695                 break;
1696         }
1697
1698         if (i == MAX_NEXT_COLUMNS)
1699                 return RS_COLUMN_INVALID;
1700
1701         return next_col_id;
1702 }
1703
1704 static int rs_switch_to_column(struct iwl_mvm *mvm,
1705                                struct iwl_lq_sta *lq_sta,
1706                                struct ieee80211_sta *sta,
1707                                enum rs_column col_id)
1708 {
1709         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1710         struct iwl_scale_tbl_info *search_tbl =
1711                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1712         struct rs_rate *rate = &search_tbl->rate;
1713         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1714         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1715         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1716                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1717         unsigned long rate_mask = 0;
1718         u32 rate_idx = 0;
1719
1720         memcpy(search_tbl, tbl, sz);
1721
1722         rate->sgi = column->sgi;
1723         rate->ant = column->ant;
1724
1725         if (column->mode == RS_LEGACY) {
1726                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1727                         rate->type = LQ_LEGACY_A;
1728                 else
1729                         rate->type = LQ_LEGACY_G;
1730
1731                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1732                 rate->ldpc = false;
1733                 rate_mask = lq_sta->active_legacy_rate;
1734         } else if (column->mode == RS_SISO) {
1735                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1736                 rate_mask = lq_sta->active_siso_rate;
1737         } else if (column->mode == RS_MIMO2) {
1738                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1739                 rate_mask = lq_sta->active_mimo2_rate;
1740         } else {
1741                 WARN_ON_ONCE("Bad column mode");
1742         }
1743
1744         if (column->mode != RS_LEGACY) {
1745                 rate->bw = rs_bw_from_sta_bw(sta);
1746                 rate->ldpc = lq_sta->ldpc;
1747         }
1748
1749         search_tbl->column = col_id;
1750         rs_set_expected_tpt_table(lq_sta, search_tbl);
1751
1752         lq_sta->visited_columns |= BIT(col_id);
1753
1754         /* Get the best matching rate if we're changing modes. e.g.
1755          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1756          */
1757         if (curr_column->mode != column->mode) {
1758                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1759                                             rate_mask, rate->index);
1760
1761                 if ((rate_idx == IWL_RATE_INVALID) ||
1762                     !(BIT(rate_idx) & rate_mask)) {
1763                         IWL_DEBUG_RATE(mvm,
1764                                        "can not switch with index %d"
1765                                        " rate mask %lx\n",
1766                                        rate_idx, rate_mask);
1767
1768                         goto err;
1769                 }
1770
1771                 rate->index = rate_idx;
1772         }
1773
1774         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1775                        col_id, rate->index);
1776
1777         return 0;
1778
1779 err:
1780         rate->type = LQ_NONE;
1781         return -1;
1782 }
1783
1784 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1785                                          struct iwl_scale_tbl_info *tbl,
1786                                          s32 sr, int low, int high,
1787                                          int current_tpt,
1788                                          int low_tpt, int high_tpt)
1789 {
1790         enum rs_action action = RS_ACTION_STAY;
1791
1792         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1793             (current_tpt == 0)) {
1794                 IWL_DEBUG_RATE(mvm,
1795                                "Decrease rate because of low SR\n");
1796                 return RS_ACTION_DOWNSCALE;
1797         }
1798
1799         if ((low_tpt == IWL_INVALID_VALUE) &&
1800             (high_tpt == IWL_INVALID_VALUE) &&
1801             (high != IWL_RATE_INVALID)) {
1802                 IWL_DEBUG_RATE(mvm,
1803                                "No data about high/low rates. Increase rate\n");
1804                 return RS_ACTION_UPSCALE;
1805         }
1806
1807         if ((high_tpt == IWL_INVALID_VALUE) &&
1808             (high != IWL_RATE_INVALID) &&
1809             (low_tpt != IWL_INVALID_VALUE) &&
1810             (low_tpt < current_tpt)) {
1811                 IWL_DEBUG_RATE(mvm,
1812                                "No data about high rate and low rate is worse. Increase rate\n");
1813                 return RS_ACTION_UPSCALE;
1814         }
1815
1816         if ((high_tpt != IWL_INVALID_VALUE) &&
1817             (high_tpt > current_tpt)) {
1818                 IWL_DEBUG_RATE(mvm,
1819                                "Higher rate is better. Increate rate\n");
1820                 return RS_ACTION_UPSCALE;
1821         }
1822
1823         if ((low_tpt != IWL_INVALID_VALUE) &&
1824             (high_tpt != IWL_INVALID_VALUE) &&
1825             (low_tpt < current_tpt) &&
1826             (high_tpt < current_tpt)) {
1827                 IWL_DEBUG_RATE(mvm,
1828                                "Both high and low are worse. Maintain rate\n");
1829                 return RS_ACTION_STAY;
1830         }
1831
1832         if ((low_tpt != IWL_INVALID_VALUE) &&
1833             (low_tpt > current_tpt)) {
1834                 IWL_DEBUG_RATE(mvm,
1835                                "Lower rate is better\n");
1836                 action = RS_ACTION_DOWNSCALE;
1837                 goto out;
1838         }
1839
1840         if ((low_tpt == IWL_INVALID_VALUE) &&
1841             (low != IWL_RATE_INVALID)) {
1842                 IWL_DEBUG_RATE(mvm,
1843                                "No data about lower rate\n");
1844                 action = RS_ACTION_DOWNSCALE;
1845                 goto out;
1846         }
1847
1848         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1849
1850 out:
1851         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1852                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1853                         IWL_DEBUG_RATE(mvm,
1854                                        "SR is above NO DECREASE. Avoid downscale\n");
1855                         action = RS_ACTION_STAY;
1856                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1857                         IWL_DEBUG_RATE(mvm,
1858                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1859                         action = RS_ACTION_STAY;
1860                 } else {
1861                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1862                 }
1863         }
1864
1865         return action;
1866 }
1867
1868 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1869                           struct iwl_lq_sta *lq_sta)
1870 {
1871         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1872          * supports STBC of at least 1*SS
1873          */
1874         if (!lq_sta->stbc_capable)
1875                 return false;
1876
1877         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1878                 return false;
1879
1880         return true;
1881 }
1882
1883 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1884                                 int *weaker, int *stronger)
1885 {
1886         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1887         if (*weaker > TPC_MAX_REDUCTION)
1888                 *weaker = TPC_INVALID;
1889
1890         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1891         if (*stronger < 0)
1892                 *stronger = TPC_INVALID;
1893 }
1894
1895 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1896                            struct rs_rate *rate, enum ieee80211_band band)
1897 {
1898         int index = rate->index;
1899         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1900         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1901                                 !vif->bss_conf.ps);
1902
1903         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1904                        cam, sta_ps_disabled);
1905         /*
1906          * allow tpc only if power management is enabled, or bt coex
1907          * activity grade allows it and we are on 2.4Ghz.
1908          */
1909         if ((cam || sta_ps_disabled) &&
1910             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1911                 return false;
1912
1913         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1914         if (is_legacy(rate))
1915                 return index == IWL_RATE_54M_INDEX;
1916         if (is_ht(rate))
1917                 return index == IWL_RATE_MCS_7_INDEX;
1918         if (is_vht(rate))
1919                 return index == IWL_RATE_MCS_7_INDEX ||
1920                        index == IWL_RATE_MCS_8_INDEX ||
1921                        index == IWL_RATE_MCS_9_INDEX;
1922
1923         WARN_ON_ONCE(1);
1924         return false;
1925 }
1926
1927 enum tpc_action {
1928         TPC_ACTION_STAY,
1929         TPC_ACTION_DECREASE,
1930         TPC_ACTION_INCREASE,
1931         TPC_ACTION_NO_RESTIRCTION,
1932 };
1933
1934 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1935                                          s32 sr, int weak, int strong,
1936                                          int current_tpt,
1937                                          int weak_tpt, int strong_tpt)
1938 {
1939         /* stay until we have valid tpt */
1940         if (current_tpt == IWL_INVALID_VALUE) {
1941                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1942                 return TPC_ACTION_STAY;
1943         }
1944
1945         /* Too many failures, increase txp */
1946         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1947             current_tpt == 0) {
1948                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1949                 return TPC_ACTION_NO_RESTIRCTION;
1950         }
1951
1952         /* try decreasing first if applicable */
1953         if (weak != TPC_INVALID) {
1954                 if (weak_tpt == IWL_INVALID_VALUE &&
1955                     (strong_tpt == IWL_INVALID_VALUE ||
1956                      current_tpt >= strong_tpt)) {
1957                         IWL_DEBUG_RATE(mvm,
1958                                        "no weak txp measurement. decrease txp\n");
1959                         return TPC_ACTION_DECREASE;
1960                 }
1961
1962                 if (weak_tpt > current_tpt) {
1963                         IWL_DEBUG_RATE(mvm,
1964                                        "lower txp has better tpt. decrease txp\n");
1965                         return TPC_ACTION_DECREASE;
1966                 }
1967         }
1968
1969         /* next, increase if needed */
1970         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1971             strong != TPC_INVALID) {
1972                 if (weak_tpt == IWL_INVALID_VALUE &&
1973                     strong_tpt != IWL_INVALID_VALUE &&
1974                     current_tpt < strong_tpt) {
1975                         IWL_DEBUG_RATE(mvm,
1976                                        "higher txp has better tpt. increase txp\n");
1977                         return TPC_ACTION_INCREASE;
1978                 }
1979
1980                 if (weak_tpt < current_tpt &&
1981                     (strong_tpt == IWL_INVALID_VALUE ||
1982                      strong_tpt > current_tpt)) {
1983                         IWL_DEBUG_RATE(mvm,
1984                                        "lower txp has worse tpt. increase txp\n");
1985                         return TPC_ACTION_INCREASE;
1986                 }
1987         }
1988
1989         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1990         return TPC_ACTION_STAY;
1991 }
1992
1993 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1994                            struct ieee80211_sta *sta,
1995                            struct iwl_lq_sta *lq_sta,
1996                            struct iwl_scale_tbl_info *tbl)
1997 {
1998         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1999         struct ieee80211_vif *vif = mvm_sta->vif;
2000         struct ieee80211_chanctx_conf *chanctx_conf;
2001         enum ieee80211_band band;
2002         struct iwl_rate_scale_data *window;
2003         struct rs_rate *rate = &tbl->rate;
2004         enum tpc_action action;
2005         s32 sr;
2006         u8 cur = lq_sta->lq.reduced_tpc;
2007         int current_tpt;
2008         int weak, strong;
2009         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2010
2011 #ifdef CONFIG_MAC80211_DEBUGFS
2012         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2013                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2014                                lq_sta->pers.dbg_fixed_txp_reduction);
2015                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2016                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2017         }
2018 #endif
2019
2020         rcu_read_lock();
2021         chanctx_conf = rcu_dereference(vif->chanctx_conf);
2022         if (WARN_ON(!chanctx_conf))
2023                 band = IEEE80211_NUM_BANDS;
2024         else
2025                 band = chanctx_conf->def.chan->band;
2026         rcu_read_unlock();
2027
2028         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2029                 IWL_DEBUG_RATE(mvm,
2030                                "tpc is not allowed. remove txp restrictions\n");
2031                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2032                 return cur != TPC_NO_REDUCTION;
2033         }
2034
2035         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2036
2037         /* Collect measured throughputs for current and adjacent rates */
2038         window = tbl->tpc_win;
2039         sr = window[cur].success_ratio;
2040         current_tpt = window[cur].average_tpt;
2041         if (weak != TPC_INVALID)
2042                 weak_tpt = window[weak].average_tpt;
2043         if (strong != TPC_INVALID)
2044                 strong_tpt = window[strong].average_tpt;
2045
2046         IWL_DEBUG_RATE(mvm,
2047                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2048                        cur, current_tpt, sr, weak, strong,
2049                        weak_tpt, strong_tpt);
2050
2051         action = rs_get_tpc_action(mvm, sr, weak, strong,
2052                                    current_tpt, weak_tpt, strong_tpt);
2053
2054         /* override actions if we are on the edge */
2055         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2056                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2057                 action = TPC_ACTION_STAY;
2058         } else if (strong == TPC_INVALID &&
2059                    (action == TPC_ACTION_INCREASE ||
2060                     action == TPC_ACTION_NO_RESTIRCTION)) {
2061                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2062                 action = TPC_ACTION_STAY;
2063         }
2064
2065         switch (action) {
2066         case TPC_ACTION_DECREASE:
2067                 lq_sta->lq.reduced_tpc = weak;
2068                 return true;
2069         case TPC_ACTION_INCREASE:
2070                 lq_sta->lq.reduced_tpc = strong;
2071                 return true;
2072         case TPC_ACTION_NO_RESTIRCTION:
2073                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2074                 return true;
2075         case TPC_ACTION_STAY:
2076                 /* do nothing */
2077                 break;
2078         }
2079         return false;
2080 }
2081
2082 /*
2083  * Do rate scaling and search for new modulation mode.
2084  */
2085 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2086                                   struct ieee80211_sta *sta,
2087                                   struct iwl_lq_sta *lq_sta,
2088                                   int tid)
2089 {
2090         int low = IWL_RATE_INVALID;
2091         int high = IWL_RATE_INVALID;
2092         int index;
2093         struct iwl_rate_scale_data *window = NULL;
2094         int current_tpt = IWL_INVALID_VALUE;
2095         int low_tpt = IWL_INVALID_VALUE;
2096         int high_tpt = IWL_INVALID_VALUE;
2097         u32 fail_count;
2098         enum rs_action scale_action = RS_ACTION_STAY;
2099         u16 rate_mask;
2100         u8 update_lq = 0;
2101         struct iwl_scale_tbl_info *tbl, *tbl1;
2102         u8 active_tbl = 0;
2103         u8 done_search = 0;
2104         u16 high_low;
2105         s32 sr;
2106         u8 prev_agg = lq_sta->is_agg;
2107         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2108         struct iwl_mvm_tid_data *tid_data;
2109         struct rs_rate *rate;
2110
2111         lq_sta->is_agg = !!sta_priv->agg_tids;
2112
2113         /*
2114          * Select rate-scale / modulation-mode table to work with in
2115          * the rest of this function:  "search" if searching for better
2116          * modulation mode, or "active" if doing rate scaling within a mode.
2117          */
2118         if (!lq_sta->search_better_tbl)
2119                 active_tbl = lq_sta->active_tbl;
2120         else
2121                 active_tbl = 1 - lq_sta->active_tbl;
2122
2123         tbl = &(lq_sta->lq_info[active_tbl]);
2124         rate = &tbl->rate;
2125
2126         if (prev_agg != lq_sta->is_agg) {
2127                 IWL_DEBUG_RATE(mvm,
2128                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2129                                prev_agg, lq_sta->is_agg);
2130                 rs_set_expected_tpt_table(lq_sta, tbl);
2131                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2132         }
2133
2134         /* current tx rate */
2135         index = lq_sta->last_txrate_idx;
2136
2137         /* rates available for this association, and for modulation mode */
2138         rate_mask = rs_get_supported_rates(lq_sta, rate);
2139
2140         if (!(BIT(index) & rate_mask)) {
2141                 IWL_ERR(mvm, "Current Rate is not valid\n");
2142                 if (lq_sta->search_better_tbl) {
2143                         /* revert to active table if search table is not valid*/
2144                         rate->type = LQ_NONE;
2145                         lq_sta->search_better_tbl = 0;
2146                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2147                         rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2148                 }
2149                 return;
2150         }
2151
2152         /* Get expected throughput table and history window for current rate */
2153         if (!tbl->expected_tpt) {
2154                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2155                 return;
2156         }
2157
2158         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2159         window = &(tbl->win[index]);
2160
2161         /*
2162          * If there is not enough history to calculate actual average
2163          * throughput, keep analyzing results of more tx frames, without
2164          * changing rate or mode (bypass most of the rest of this function).
2165          * Set up new rate table in uCode only if old rate is not supported
2166          * in current association (use new rate found above).
2167          */
2168         fail_count = window->counter - window->success_counter;
2169         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2170             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2171                 IWL_DEBUG_RATE(mvm,
2172                                "(%s: %d): Test Window: succ %d total %d\n",
2173                                rs_pretty_lq_type(rate->type),
2174                                index, window->success_counter, window->counter);
2175
2176                 /* Can't calculate this yet; not enough history */
2177                 window->average_tpt = IWL_INVALID_VALUE;
2178
2179                 /* Should we stay with this modulation mode,
2180                  * or search for a new one? */
2181                 rs_stay_in_table(lq_sta, false);
2182
2183                 goto out;
2184         }
2185         /* Else we have enough samples; calculate estimate of
2186          * actual average throughput */
2187         if (window->average_tpt != ((window->success_ratio *
2188                         tbl->expected_tpt[index] + 64) / 128)) {
2189                 window->average_tpt = ((window->success_ratio *
2190                                         tbl->expected_tpt[index] + 64) / 128);
2191         }
2192
2193         /* If we are searching for better modulation mode, check success. */
2194         if (lq_sta->search_better_tbl) {
2195                 /* If good success, continue using the "search" mode;
2196                  * no need to send new link quality command, since we're
2197                  * continuing to use the setup that we've been trying. */
2198                 if (window->average_tpt > lq_sta->last_tpt) {
2199                         IWL_DEBUG_RATE(mvm,
2200                                        "SWITCHING TO NEW TABLE SR: %d "
2201                                        "cur-tpt %d old-tpt %d\n",
2202                                        window->success_ratio,
2203                                        window->average_tpt,
2204                                        lq_sta->last_tpt);
2205
2206                         /* Swap tables; "search" becomes "active" */
2207                         lq_sta->active_tbl = active_tbl;
2208                         current_tpt = window->average_tpt;
2209                 /* Else poor success; go back to mode in "active" table */
2210                 } else {
2211                         IWL_DEBUG_RATE(mvm,
2212                                        "GOING BACK TO THE OLD TABLE: SR %d "
2213                                        "cur-tpt %d old-tpt %d\n",
2214                                        window->success_ratio,
2215                                        window->average_tpt,
2216                                        lq_sta->last_tpt);
2217
2218                         /* Nullify "search" table */
2219                         rate->type = LQ_NONE;
2220
2221                         /* Revert to "active" table */
2222                         active_tbl = lq_sta->active_tbl;
2223                         tbl = &(lq_sta->lq_info[active_tbl]);
2224
2225                         /* Revert to "active" rate and throughput info */
2226                         index = tbl->rate.index;
2227                         current_tpt = lq_sta->last_tpt;
2228
2229                         /* Need to set up a new rate table in uCode */
2230                         update_lq = 1;
2231                 }
2232
2233                 /* Either way, we've made a decision; modulation mode
2234                  * search is done, allow rate adjustment next time. */
2235                 lq_sta->search_better_tbl = 0;
2236                 done_search = 1;        /* Don't switch modes below! */
2237                 goto lq_update;
2238         }
2239
2240         /* (Else) not in search of better modulation mode, try for better
2241          * starting rate, while staying in this mode. */
2242         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2243         low = high_low & 0xff;
2244         high = (high_low >> 8) & 0xff;
2245
2246         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2247
2248         sr = window->success_ratio;
2249
2250         /* Collect measured throughputs for current and adjacent rates */
2251         current_tpt = window->average_tpt;
2252         if (low != IWL_RATE_INVALID)
2253                 low_tpt = tbl->win[low].average_tpt;
2254         if (high != IWL_RATE_INVALID)
2255                 high_tpt = tbl->win[high].average_tpt;
2256
2257         IWL_DEBUG_RATE(mvm,
2258                        "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2259                        rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2260                        low, high, low_tpt, high_tpt);
2261
2262         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2263                                           current_tpt, low_tpt, high_tpt);
2264
2265         /* Force a search in case BT doesn't like us being in MIMO */
2266         if (is_mimo(rate) &&
2267             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2268                 IWL_DEBUG_RATE(mvm,
2269                                "BT Coex forbids MIMO. Search for new config\n");
2270                 rs_stay_in_table(lq_sta, true);
2271                 goto lq_update;
2272         }
2273
2274         switch (scale_action) {
2275         case RS_ACTION_DOWNSCALE:
2276                 /* Decrease starting rate, update uCode's rate table */
2277                 if (low != IWL_RATE_INVALID) {
2278                         update_lq = 1;
2279                         index = low;
2280                 } else {
2281                         IWL_DEBUG_RATE(mvm,
2282                                        "At the bottom rate. Can't decrease\n");
2283                 }
2284
2285                 break;
2286         case RS_ACTION_UPSCALE:
2287                 /* Increase starting rate, update uCode's rate table */
2288                 if (high != IWL_RATE_INVALID) {
2289                         update_lq = 1;
2290                         index = high;
2291                 } else {
2292                         IWL_DEBUG_RATE(mvm,
2293                                        "At the top rate. Can't increase\n");
2294                 }
2295
2296                 break;
2297         case RS_ACTION_STAY:
2298                 /* No change */
2299                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2300                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2301                 break;
2302         default:
2303                 break;
2304         }
2305
2306 lq_update:
2307         /* Replace uCode's rate table for the destination station. */
2308         if (update_lq) {
2309                 tbl->rate.index = index;
2310                 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2311         }
2312
2313         rs_stay_in_table(lq_sta, false);
2314
2315         /*
2316          * Search for new modulation mode if we're:
2317          * 1)  Not changing rates right now
2318          * 2)  Not just finishing up a search
2319          * 3)  Allowing a new search
2320          */
2321         if (!update_lq && !done_search &&
2322             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2323             && window->counter) {
2324                 enum rs_column next_column;
2325
2326                 /* Save current throughput to compare with "search" throughput*/
2327                 lq_sta->last_tpt = current_tpt;
2328
2329                 IWL_DEBUG_RATE(mvm,
2330                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2331                                update_lq, done_search, lq_sta->rs_state,
2332                                window->counter);
2333
2334                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2335                 if (next_column != RS_COLUMN_INVALID) {
2336                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2337                                                       next_column);
2338                         if (!ret)
2339                                 lq_sta->search_better_tbl = 1;
2340                 } else {
2341                         IWL_DEBUG_RATE(mvm,
2342                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2343                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2344                 }
2345
2346                 /* If new "search" mode was selected, set up in uCode table */
2347                 if (lq_sta->search_better_tbl) {
2348                         /* Access the "search" table, clear its history. */
2349                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2350                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2351
2352                         /* Use new "search" start rate */
2353                         index = tbl->rate.index;
2354
2355                         rs_dump_rate(mvm, &tbl->rate,
2356                                      "Switch to SEARCH TABLE:");
2357                         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
2358                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2359                 } else {
2360                         done_search = 1;
2361                 }
2362         }
2363
2364         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2365                 /* If the "active" (non-search) mode was legacy,
2366                  * and we've tried switching antennas,
2367                  * but we haven't been able to try HT modes (not available),
2368                  * stay with best antenna legacy modulation for a while
2369                  * before next round of mode comparisons. */
2370                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2371                 if (is_legacy(&tbl1->rate)) {
2372                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2373
2374                         if (tid != IWL_MAX_TID_COUNT) {
2375                                 tid_data = &sta_priv->tid_data[tid];
2376                                 if (tid_data->state != IWL_AGG_OFF) {
2377                                         IWL_DEBUG_RATE(mvm,
2378                                                        "Stop aggregation on tid %d\n",
2379                                                        tid);
2380                                         ieee80211_stop_tx_ba_session(sta, tid);
2381                                 }
2382                         }
2383                         rs_set_stay_in_table(mvm, 1, lq_sta);
2384                 } else {
2385                 /* If we're in an HT mode, and all 3 mode switch actions
2386                  * have been tried and compared, stay in this best modulation
2387                  * mode for a while before next round of mode comparisons. */
2388                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2389                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2390                             (tid != IWL_MAX_TID_COUNT)) {
2391                                 tid_data = &sta_priv->tid_data[tid];
2392                                 if (tid_data->state == IWL_AGG_OFF) {
2393                                         IWL_DEBUG_RATE(mvm,
2394                                                        "try to aggregate tid %d\n",
2395                                                        tid);
2396                                         rs_tl_turn_on_agg(mvm, tid,
2397                                                           lq_sta, sta);
2398                                 }
2399                         }
2400                         rs_set_stay_in_table(mvm, 0, lq_sta);
2401                 }
2402         }
2403
2404 out:
2405         lq_sta->last_txrate_idx = index;
2406 }
2407
2408 struct rs_init_rate_info {
2409         s8 rssi;
2410         u8 rate_idx;
2411 };
2412
2413 static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
2414         { -60, IWL_RATE_54M_INDEX },
2415         { -64, IWL_RATE_48M_INDEX },
2416         { -68, IWL_RATE_36M_INDEX },
2417         { -80, IWL_RATE_24M_INDEX },
2418         { -84, IWL_RATE_18M_INDEX },
2419         { -85, IWL_RATE_12M_INDEX },
2420         { -86, IWL_RATE_11M_INDEX },
2421         { -88, IWL_RATE_5M_INDEX  },
2422         { -90, IWL_RATE_2M_INDEX  },
2423         { S8_MIN, IWL_RATE_1M_INDEX },
2424 };
2425
2426 static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
2427         { -60, IWL_RATE_54M_INDEX },
2428         { -64, IWL_RATE_48M_INDEX },
2429         { -72, IWL_RATE_36M_INDEX },
2430         { -80, IWL_RATE_24M_INDEX },
2431         { -84, IWL_RATE_18M_INDEX },
2432         { -85, IWL_RATE_12M_INDEX },
2433         { -87, IWL_RATE_9M_INDEX  },
2434         { S8_MIN, IWL_RATE_6M_INDEX },
2435 };
2436
2437 /* Choose an initial legacy rate and antenna to use based on the RSSI
2438  * of last Rx
2439  */
2440 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2441                                 struct iwl_lq_sta *lq_sta,
2442                                 enum ieee80211_band band,
2443                                 struct rs_rate *rate)
2444 {
2445         int i, nentries;
2446         s8 best_rssi = S8_MIN;
2447         u8 best_ant = ANT_NONE;
2448         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2449         const struct rs_init_rate_info *initial_rates;
2450
2451         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2452                 if (!(lq_sta->pers.chains & BIT(i)))
2453                         continue;
2454
2455                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2456                         best_rssi = lq_sta->pers.chain_signal[i];
2457                         best_ant = BIT(i);
2458                 }
2459         }
2460
2461         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2462                        rs_pretty_ant(best_ant), best_rssi);
2463
2464         if (best_ant != ANT_A && best_ant != ANT_B)
2465                 rate->ant = first_antenna(valid_tx_ant);
2466         else
2467                 rate->ant = best_ant;
2468
2469         rate->sgi = false;
2470         rate->ldpc = false;
2471         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2472
2473         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2474                                      BITS_PER_LONG);
2475
2476         if (band == IEEE80211_BAND_5GHZ) {
2477                 rate->type = LQ_LEGACY_A;
2478                 initial_rates = rs_init_rates_5ghz;
2479                 nentries = ARRAY_SIZE(rs_init_rates_5ghz);
2480         } else {
2481                 rate->type = LQ_LEGACY_G;
2482                 initial_rates = rs_init_rates_24ghz;
2483                 nentries = ARRAY_SIZE(rs_init_rates_24ghz);
2484         }
2485
2486         if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2487                 for (i = 0; i < nentries; i++) {
2488                         int rate_idx = initial_rates[i].rate_idx;
2489                         if ((best_rssi >= initial_rates[i].rssi) &&
2490                             (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2491                                 rate->index = rate_idx;
2492                                 break;
2493                         }
2494                 }
2495         }
2496
2497         IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2498                        rs_pretty_ant(rate->ant));
2499 }
2500
2501 /* Save info about RSSI of last Rx */
2502 void rs_update_last_rssi(struct iwl_mvm *mvm,
2503                          struct iwl_lq_sta *lq_sta,
2504                          struct ieee80211_rx_status *rx_status)
2505 {
2506         lq_sta->pers.chains = rx_status->chains;
2507         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2508         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2509         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2510 }
2511
2512 /**
2513  * rs_initialize_lq - Initialize a station's hardware rate table
2514  *
2515  * The uCode's station table contains a table of fallback rates
2516  * for automatic fallback during transmission.
2517  *
2518  * NOTE: This sets up a default set of values.  These will be replaced later
2519  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2520  *       rc80211_simple.
2521  *
2522  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2523  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2524  *       which requires station table entry to exist).
2525  */
2526 static void rs_initialize_lq(struct iwl_mvm *mvm,
2527                              struct ieee80211_sta *sta,
2528                              struct iwl_lq_sta *lq_sta,
2529                              enum ieee80211_band band,
2530                              bool init)
2531 {
2532         struct iwl_scale_tbl_info *tbl;
2533         struct rs_rate *rate;
2534         u8 active_tbl = 0;
2535
2536         if (!sta || !lq_sta)
2537                 return;
2538
2539         if (!lq_sta->search_better_tbl)
2540                 active_tbl = lq_sta->active_tbl;
2541         else
2542                 active_tbl = 1 - lq_sta->active_tbl;
2543
2544         tbl = &(lq_sta->lq_info[active_tbl]);
2545         rate = &tbl->rate;
2546
2547         rs_get_initial_rate(mvm, lq_sta, band, rate);
2548         lq_sta->last_txrate_idx = rate->index;
2549
2550         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2551         if (rate->ant == ANT_A)
2552                 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2553         else
2554                 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2555
2556         rs_set_expected_tpt_table(lq_sta, tbl);
2557         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2558         /* TODO restore station should remember the lq cmd */
2559         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2560 }
2561
2562 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2563                         struct ieee80211_tx_rate_control *txrc)
2564 {
2565         struct sk_buff *skb = txrc->skb;
2566         struct iwl_op_mode *op_mode __maybe_unused =
2567                         (struct iwl_op_mode *)mvm_r;
2568         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2569         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2570         struct iwl_lq_sta *lq_sta = mvm_sta;
2571
2572         /* 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 ((mvm->fw->ucode_capa.capa[0] & 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         /* Stop any ongoing aggregations as rs starts off assuming no agg */
2890         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2891                 ieee80211_stop_tx_ba_session(sta, tid);
2892
2893         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2894 }
2895
2896 #ifdef CONFIG_MAC80211_DEBUGFS
2897 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2898                                             struct iwl_lq_cmd *lq_cmd,
2899                                             enum ieee80211_band band,
2900                                             u32 ucode_rate)
2901 {
2902         struct rs_rate rate;
2903         int i;
2904         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2905         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2906         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2907
2908         for (i = 0; i < num_rates; i++)
2909                 lq_cmd->rs_table[i] = ucode_rate_le32;
2910
2911         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2912
2913         if (is_mimo(&rate))
2914                 lq_cmd->mimo_delim = num_rates - 1;
2915         else
2916                 lq_cmd->mimo_delim = 0;
2917
2918         lq_cmd->reduced_tpc = 0;
2919
2920         if (num_of_ant(ant) == 1)
2921                 lq_cmd->single_stream_ant_msk = ant;
2922
2923         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2924 }
2925 #endif /* CONFIG_MAC80211_DEBUGFS */
2926
2927 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2928                                      struct iwl_lq_sta *lq_sta,
2929                                      struct rs_rate *rate,
2930                                      __le32 *rs_table, int *rs_table_index,
2931                                      int num_rates, int num_retries,
2932                                      u8 valid_tx_ant, bool toggle_ant)
2933 {
2934         int i, j;
2935         __le32 ucode_rate;
2936         bool bottom_reached = false;
2937         int prev_rate_idx = rate->index;
2938         int end = LINK_QUAL_MAX_RETRY_NUM;
2939         int index = *rs_table_index;
2940
2941         for (i = 0; i < num_rates && index < end; i++) {
2942                 for (j = 0; j < num_retries && index < end; j++, index++) {
2943                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
2944                                                                          rate));
2945                         rs_table[index] = ucode_rate;
2946                         if (toggle_ant)
2947                                 rs_toggle_antenna(valid_tx_ant, rate);
2948                 }
2949
2950                 prev_rate_idx = rate->index;
2951                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2952                 if (bottom_reached && !is_legacy(rate))
2953                         break;
2954         }
2955
2956         if (!bottom_reached && !is_legacy(rate))
2957                 rate->index = prev_rate_idx;
2958
2959         *rs_table_index = index;
2960 }
2961
2962 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2963  * column the rate table should look like this:
2964  *
2965  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2966  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2967  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2968  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2969  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2970  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2971  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2972  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2973  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2974  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2975  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2976  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2977  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2978  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2979  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2980  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2981  */
2982 static void rs_build_rates_table(struct iwl_mvm *mvm,
2983                                  struct ieee80211_sta *sta,
2984                                  struct iwl_lq_sta *lq_sta,
2985                                  const struct rs_rate *initial_rate)
2986 {
2987         struct rs_rate rate;
2988         int num_rates, num_retries, index = 0;
2989         u8 valid_tx_ant = 0;
2990         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2991         bool toggle_ant = false;
2992
2993         memcpy(&rate, initial_rate, sizeof(rate));
2994
2995         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2996
2997         /* TODO: remove old API when min FW API hits 14 */
2998         if (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
2999             rs_stbc_allow(mvm, sta, lq_sta))
3000                 rate.stbc = true;
3001
3002         if (is_siso(&rate)) {
3003                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3004                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3005         } else if (is_mimo(&rate)) {
3006                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3007                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3008         } else {
3009                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3010                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3011                 toggle_ant = true;
3012         }
3013
3014         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3015                                  num_rates, num_retries, valid_tx_ant,
3016                                  toggle_ant);
3017
3018         rs_get_lower_rate_down_column(lq_sta, &rate);
3019
3020         if (is_siso(&rate)) {
3021                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3022                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3023                 lq_cmd->mimo_delim = index;
3024         } else if (is_legacy(&rate)) {
3025                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3026                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3027         } else {
3028                 WARN_ON_ONCE(1);
3029         }
3030
3031         toggle_ant = true;
3032
3033         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3034                                  num_rates, num_retries, valid_tx_ant,
3035                                  toggle_ant);
3036
3037         rs_get_lower_rate_down_column(lq_sta, &rate);
3038
3039         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3040         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3041
3042         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3043                                  num_rates, num_retries, valid_tx_ant,
3044                                  toggle_ant);
3045
3046 }
3047
3048 struct rs_bfer_active_iter_data {
3049         struct ieee80211_sta *exclude_sta;
3050         struct iwl_mvm_sta *bfer_mvmsta;
3051 };
3052
3053 static void rs_bfer_active_iter(void *_data,
3054                                 struct ieee80211_sta *sta)
3055 {
3056         struct rs_bfer_active_iter_data *data = _data;
3057         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3058         struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3059         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3060
3061         if (sta == data->exclude_sta)
3062                 return;
3063
3064         /* The current sta has BFER allowed */
3065         if (ss_params & LQ_SS_BFER_ALLOWED) {
3066                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3067
3068                 data->bfer_mvmsta = mvmsta;
3069         }
3070 }
3071
3072 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3073 {
3074         int prio = -1;
3075         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3076
3077         switch (viftype) {
3078         case NL80211_IFTYPE_AP:
3079         case NL80211_IFTYPE_P2P_GO:
3080                 prio = 3;
3081                 break;
3082         case NL80211_IFTYPE_P2P_CLIENT:
3083                 prio = 2;
3084                 break;
3085         case NL80211_IFTYPE_STATION:
3086                 prio = 1;
3087                 break;
3088         default:
3089                 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3090                 prio = -1;
3091         }
3092
3093         return prio;
3094 }
3095
3096 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3097 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3098                                 struct iwl_mvm_sta *sta2)
3099 {
3100         int prio1 = rs_bfer_priority(sta1);
3101         int prio2 = rs_bfer_priority(sta2);
3102
3103         if (prio1 > prio2)
3104                 return 1;
3105         if (prio1 < prio2)
3106                 return -1;
3107         return 0;
3108 }
3109
3110 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3111                                 struct ieee80211_sta *sta,
3112                                 struct iwl_lq_sta *lq_sta,
3113                                 const struct rs_rate *initial_rate)
3114 {
3115         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3116         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3117         struct rs_bfer_active_iter_data data = {
3118                 .exclude_sta = sta,
3119                 .bfer_mvmsta = NULL,
3120         };
3121         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3122         u32 ss_params = LQ_SS_PARAMS_VALID;
3123
3124         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3125                 goto out;
3126
3127 #ifdef CONFIG_MAC80211_DEBUGFS
3128         /* Check if forcing the decision is configured.
3129          * Note that SISO is forced by not allowing STBC or BFER
3130          */
3131         if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3132                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3133         else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3134                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3135
3136         if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3137                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3138                                lq_sta->pers.ss_force);
3139                 goto out;
3140         }
3141 #endif
3142
3143         if (lq_sta->stbc_capable)
3144                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3145
3146         if (!lq_sta->bfer_capable)
3147                 goto out;
3148
3149         ieee80211_iterate_stations_atomic(mvm->hw,
3150                                           rs_bfer_active_iter,
3151                                           &data);
3152         bfer_mvmsta = data.bfer_mvmsta;
3153
3154         /* This code is safe as it doesn't run concurrently for different
3155          * stations. This is guaranteed by the fact that calls to
3156          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3157          */
3158         if (!bfer_mvmsta) {
3159                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3160
3161                 ss_params |= LQ_SS_BFER_ALLOWED;
3162                 goto out;
3163         }
3164
3165         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3166                        bfer_mvmsta->sta_id);
3167
3168         /* Disallow BFER on another STA if active and we're a higher priority */
3169         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3170                 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3171                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3172
3173                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3174                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3175                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3176
3177                 ss_params |= LQ_SS_BFER_ALLOWED;
3178                 IWL_DEBUG_RATE(mvm,
3179                                "Lower priority BFER sta found (%d). Switch BFER\n",
3180                                bfer_mvmsta->sta_id);
3181         }
3182 out:
3183         lq_cmd->ss_params = cpu_to_le32(ss_params);
3184 }
3185
3186 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3187                            struct ieee80211_sta *sta,
3188                            struct iwl_lq_sta *lq_sta,
3189                            const struct rs_rate *initial_rate)
3190 {
3191         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3192         struct iwl_mvm_sta *mvmsta;
3193         struct iwl_mvm_vif *mvmvif;
3194
3195         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3196         lq_cmd->agg_time_limit =
3197                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3198
3199 #ifdef CONFIG_MAC80211_DEBUGFS
3200         if (lq_sta->pers.dbg_fixed_rate) {
3201                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3202                                                 lq_sta->band,
3203                                                 lq_sta->pers.dbg_fixed_rate);
3204                 return;
3205         }
3206 #endif
3207         if (WARN_ON_ONCE(!sta || !initial_rate))
3208                 return;
3209
3210         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3211
3212         if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS)
3213                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3214
3215         if (num_of_ant(initial_rate->ant) == 1)
3216                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
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 firwmare 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 *mvm_sta, struct dentry *dir)
3663 {
3664         struct iwl_lq_sta *lq_sta = mvm_sta;
3665
3666         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3667                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
3668         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3669                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
3670         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3671                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3672         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3673                           &lq_sta->tx_agg_tid_en);
3674         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3675                           &lq_sta->pers.dbg_fixed_txp_reduction);
3676
3677         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3678         return;
3679 err:
3680         IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3681 }
3682
3683 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3684 {
3685 }
3686 #endif
3687
3688 /*
3689  * Initialization of rate scaling information is done by driver after
3690  * the station is added. Since mac80211 calls this function before a
3691  * station is added we ignore it.
3692  */
3693 static void rs_rate_init_stub(void *mvm_r,
3694                               struct ieee80211_supported_band *sband,
3695                               struct cfg80211_chan_def *chandef,
3696                               struct ieee80211_sta *sta, void *mvm_sta)
3697 {
3698 }
3699
3700 static const struct rate_control_ops rs_mvm_ops = {
3701         .name = RS_NAME,
3702         .tx_status = rs_mac80211_tx_status,
3703         .get_rate = rs_get_rate,
3704         .rate_init = rs_rate_init_stub,
3705         .alloc = rs_alloc,
3706         .free = rs_free,
3707         .alloc_sta = rs_alloc_sta,
3708         .free_sta = rs_free_sta,
3709         .rate_update = rs_rate_update,
3710 #ifdef CONFIG_MAC80211_DEBUGFS
3711         .add_sta_debugfs = rs_add_debugfs,
3712         .remove_sta_debugfs = rs_remove_debugfs,
3713 #endif
3714 };
3715
3716 int iwl_mvm_rate_control_register(void)
3717 {
3718         return ieee80211_rate_control_register(&rs_mvm_ops);
3719 }
3720
3721 void iwl_mvm_rate_control_unregister(void)
3722 {
3723         ieee80211_rate_control_unregister(&rs_mvm_ops);
3724 }
3725
3726 /**
3727  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3728  * Tx protection, according to this rquest and previous requests,
3729  * and send the LQ command.
3730  * @mvmsta: The station
3731  * @enable: Enable Tx protection?
3732  */
3733 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3734                           bool enable)
3735 {
3736         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3737
3738         lockdep_assert_held(&mvm->mutex);
3739
3740         if (enable) {
3741                 if (mvmsta->tx_protection == 0)
3742                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
3743                 mvmsta->tx_protection++;
3744         } else {
3745                 mvmsta->tx_protection--;
3746                 if (mvmsta->tx_protection == 0)
3747                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3748         }
3749
3750         return iwl_mvm_send_lq_cmd(mvm, lq, false);
3751 }