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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
   4  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of version 2 of the GNU General Public License as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  18  *
  19  * The full GNU General Public License is included in this distribution in the
  20  * file called LICENSE.
  21  *
  22  * Contact Information:
  23  *  Intel Linux Wireless <ilw@linux.intel.com>
  24  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  25  *
  26  *****************************************************************************/
  27 #include <linux/kernel.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/slab.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37 #include "rs.h"
  38 #include "fw-api.h"
  39 #include "sta.h"
  40 #include "iwl-op-mode.h"
  41 #include "mvm.h"
  42 #include "debugfs.h"
  43
  44 #define RS_NAME "iwl-mvm-rs"
  45
  46 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  47
  48 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
  49  * Use this macro when dealing with thresholds consts set as a percentage
  50  */
  51 #define RS_PERCENT(x) (128 * x)
  52
  53 static u8 rs_ht_to_legacy[] = {
  54         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  55         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  56         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  57         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  58         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  59         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  60         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  61         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  62         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  63         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  64 };
  65
  66 static const u8 ant_toggle_lookup[] = {
  67         [ANT_NONE] = ANT_NONE,
  68         [ANT_A] = ANT_B,
  69         [ANT_B] = ANT_C,
  70         [ANT_AB] = ANT_BC,
  71         [ANT_C] = ANT_A,
  72         [ANT_AC] = ANT_AB,
  73         [ANT_BC] = ANT_AC,
  74         [ANT_ABC] = ANT_ABC,
  75 };
  76
  77 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  78         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  79                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  80                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  81                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  82                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  83                                     IWL_RATE_##rp##M_INDEX,           \
  84                                     IWL_RATE_##rn##M_INDEX }
  85
  86 #define IWL_DECLARE_MCS_RATE(s)                                           \
  87         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
  88                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
  89                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
  90                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
  91                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
  92                                        IWL_RATE_INVM_INDEX,               \
  93                                        IWL_RATE_INVM_INDEX }
  94
  95 /*
  96  * Parameter order:
  97  *   rate, ht rate, prev rate, next rate
  98  *
  99  * If there isn't a valid next or previous rate then INV is used which
 100  * maps to IWL_RATE_INVALID
 101  *
 102  */
 103 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 104         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 105         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 106         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 107         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 108         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 109         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 110         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 111         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 112         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 113         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 114         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 115         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 116         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 117         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 118         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 119 };
 120
 121 enum rs_action {
 122         RS_ACTION_STAY = 0,
 123         RS_ACTION_DOWNSCALE = -1,
 124         RS_ACTION_UPSCALE = 1,
 125 };
 126
 127 enum rs_column_mode {
 128         RS_INVALID = 0,
 129         RS_LEGACY,
 130         RS_SISO,
 131         RS_MIMO2,
 132 };
 133
 134 #define MAX_NEXT_COLUMNS 7
 135 #define MAX_COLUMN_CHECKS 3
 136
 137 struct rs_tx_column;
 138
 139 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 140                                      struct ieee80211_sta *sta,
 141                                      struct rs_rate *rate,
 142                                      const struct rs_tx_column *next_col);
 143
 144 struct rs_tx_column {
 145         enum rs_column_mode mode;
 146         u8 ant;
 147         bool sgi;
 148         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 149         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 150 };
 151
 152 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 153                          struct rs_rate *rate,
 154                          const struct rs_tx_column *next_col)
 155 {
 156         return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
 157 }
 158
 159 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 160                           struct rs_rate *rate,
 161                           const struct rs_tx_column *next_col)
 162 {
 163         struct iwl_mvm_sta *mvmsta;
 164         struct iwl_mvm_vif *mvmvif;
 165
 166         if (!sta->ht_cap.ht_supported)
 167                 return false;
 168
 169         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 170                 return false;
 171
 172         if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
 173                 return false;
 174
 175         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 176                 return false;
 177
 178         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 179         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 180         if (IWL_MVM_RS_DISABLE_P2P_MIMO &&
 181             iwl_mvm_vif_low_latency(mvmvif) && mvmsta->vif->p2p)
 182                 return false;
 183
 184         if (mvm->nvm_data->sku_cap_mimo_disabled)
 185                 return false;
 186
 187         return true;
 188 }
 189
 190 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 191                           struct rs_rate *rate,
 192                           const struct rs_tx_column *next_col)
 193 {
 194         if (!sta->ht_cap.ht_supported)
 195                 return false;
 196
 197         return true;
 198 }
 199
 200 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 201                          struct rs_rate *rate,
 202                          const struct rs_tx_column *next_col)
 203 {
 204         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 205         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 206
 207         if (is_ht20(rate) && (ht_cap->cap &
 208                              IEEE80211_HT_CAP_SGI_20))
 209                 return true;
 210         if (is_ht40(rate) && (ht_cap->cap &
 211                              IEEE80211_HT_CAP_SGI_40))
 212                 return true;
 213         if (is_ht80(rate) && (vht_cap->cap &
 214                              IEEE80211_VHT_CAP_SHORT_GI_80))
 215                 return true;
 216
 217         return false;
 218 }
 219
 220 static const struct rs_tx_column rs_tx_columns[] = {
 221         [RS_COLUMN_LEGACY_ANT_A] = {
 222                 .mode = RS_LEGACY,
 223                 .ant = ANT_A,
 224                 .next_columns = {
 225                         RS_COLUMN_LEGACY_ANT_B,
 226                         RS_COLUMN_SISO_ANT_A,
 227                         RS_COLUMN_MIMO2,
 228                         RS_COLUMN_INVALID,
 229                         RS_COLUMN_INVALID,
 230                         RS_COLUMN_INVALID,
 231                         RS_COLUMN_INVALID,
 232                 },
 233                 .checks = {
 234                         rs_ant_allow,
 235                 },
 236         },
 237         [RS_COLUMN_LEGACY_ANT_B] = {
 238                 .mode = RS_LEGACY,
 239                 .ant = ANT_B,
 240                 .next_columns = {
 241                         RS_COLUMN_LEGACY_ANT_A,
 242                         RS_COLUMN_SISO_ANT_B,
 243                         RS_COLUMN_MIMO2,
 244                         RS_COLUMN_INVALID,
 245                         RS_COLUMN_INVALID,
 246                         RS_COLUMN_INVALID,
 247                         RS_COLUMN_INVALID,
 248                 },
 249                 .checks = {
 250                         rs_ant_allow,
 251                 },
 252         },
 253         [RS_COLUMN_SISO_ANT_A] = {
 254                 .mode = RS_SISO,
 255                 .ant = ANT_A,
 256                 .next_columns = {
 257                         RS_COLUMN_SISO_ANT_B,
 258                         RS_COLUMN_MIMO2,
 259                         RS_COLUMN_SISO_ANT_A_SGI,
 260                         RS_COLUMN_LEGACY_ANT_A,
 261                         RS_COLUMN_LEGACY_ANT_B,
 262                         RS_COLUMN_INVALID,
 263                         RS_COLUMN_INVALID,
 264                 },
 265                 .checks = {
 266                         rs_siso_allow,
 267                         rs_ant_allow,
 268                 },
 269         },
 270         [RS_COLUMN_SISO_ANT_B] = {
 271                 .mode = RS_SISO,
 272                 .ant = ANT_B,
 273                 .next_columns = {
 274                         RS_COLUMN_SISO_ANT_A,
 275                         RS_COLUMN_MIMO2,
 276                         RS_COLUMN_SISO_ANT_B_SGI,
 277                         RS_COLUMN_LEGACY_ANT_A,
 278                         RS_COLUMN_LEGACY_ANT_B,
 279                         RS_COLUMN_INVALID,
 280                         RS_COLUMN_INVALID,
 281                 },
 282                 .checks = {
 283                         rs_siso_allow,
 284                         rs_ant_allow,
 285                 },
 286         },
 287         [RS_COLUMN_SISO_ANT_A_SGI] = {
 288                 .mode = RS_SISO,
 289                 .ant = ANT_A,
 290                 .sgi = true,
 291                 .next_columns = {
 292                         RS_COLUMN_SISO_ANT_B_SGI,
 293                         RS_COLUMN_MIMO2_SGI,
 294                         RS_COLUMN_SISO_ANT_A,
 295                         RS_COLUMN_LEGACY_ANT_A,
 296                         RS_COLUMN_LEGACY_ANT_B,
 297                         RS_COLUMN_INVALID,
 298                         RS_COLUMN_INVALID,
 299                 },
 300                 .checks = {
 301                         rs_siso_allow,
 302                         rs_ant_allow,
 303                         rs_sgi_allow,
 304                 },
 305         },
 306         [RS_COLUMN_SISO_ANT_B_SGI] = {
 307                 .mode = RS_SISO,
 308                 .ant = ANT_B,
 309                 .sgi = true,
 310                 .next_columns = {
 311                         RS_COLUMN_SISO_ANT_A_SGI,
 312                         RS_COLUMN_MIMO2_SGI,
 313                         RS_COLUMN_SISO_ANT_B,
 314                         RS_COLUMN_LEGACY_ANT_A,
 315                         RS_COLUMN_LEGACY_ANT_B,
 316                         RS_COLUMN_INVALID,
 317                         RS_COLUMN_INVALID,
 318                 },
 319                 .checks = {
 320                         rs_siso_allow,
 321                         rs_ant_allow,
 322                         rs_sgi_allow,
 323                 },
 324         },
 325         [RS_COLUMN_MIMO2] = {
 326                 .mode = RS_MIMO2,
 327                 .ant = ANT_AB,
 328                 .next_columns = {
 329                         RS_COLUMN_SISO_ANT_A,
 330                         RS_COLUMN_MIMO2_SGI,
 331                         RS_COLUMN_LEGACY_ANT_A,
 332                         RS_COLUMN_LEGACY_ANT_B,
 333                         RS_COLUMN_INVALID,
 334                         RS_COLUMN_INVALID,
 335                         RS_COLUMN_INVALID,
 336                 },
 337                 .checks = {
 338                         rs_mimo_allow,
 339                 },
 340         },
 341         [RS_COLUMN_MIMO2_SGI] = {
 342                 .mode = RS_MIMO2,
 343                 .ant = ANT_AB,
 344                 .sgi = true,
 345                 .next_columns = {
 346                         RS_COLUMN_SISO_ANT_A_SGI,
 347                         RS_COLUMN_MIMO2,
 348                         RS_COLUMN_LEGACY_ANT_A,
 349                         RS_COLUMN_LEGACY_ANT_B,
 350                         RS_COLUMN_INVALID,
 351                         RS_COLUMN_INVALID,
 352                         RS_COLUMN_INVALID,
 353                 },
 354                 .checks = {
 355                         rs_mimo_allow,
 356                         rs_sgi_allow,
 357                 },
 358         },
 359 };
 360
 361 static inline u8 rs_extract_rate(u32 rate_n_flags)
 362 {
 363         /* also works for HT because bits 7:6 are zero there */
 364         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 365 }
 366
 367 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 368 {
 369         int idx = 0;
 370
 371         if (rate_n_flags & RATE_MCS_HT_MSK) {
 372                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 373                 idx += IWL_RATE_MCS_0_INDEX;
 374
 375                 /* skip 9M not supported in HT*/
 376                 if (idx >= IWL_RATE_9M_INDEX)
 377                         idx += 1;
 378                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 379                         return idx;
 380         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 381                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 382                 idx += IWL_RATE_MCS_0_INDEX;
 383
 384                 /* skip 9M not supported in VHT*/
 385                 if (idx >= IWL_RATE_9M_INDEX)
 386                         idx++;
 387                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 388                         return idx;
 389         } else {
 390                 /* legacy rate format, search for match in table */
 391
 392                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 393                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 394                         if (iwl_rates[idx].plcp == legacy_rate)
 395                                 return idx;
 396         }
 397
 398         return IWL_RATE_INVALID;
 399 }
 400
 401 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 402                                   struct ieee80211_sta *sta,
 403                                   struct iwl_lq_sta *lq_sta,
 404                                   int tid);
 405 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 406                            struct ieee80211_sta *sta,
 407                            struct iwl_lq_sta *lq_sta,
 408                            const struct rs_rate *initial_rate);
 409 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 410
 411 /**
 412  * The following tables contain the expected throughput metrics for all rates
 413  *
 414  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 415  *
 416  * where invalid entries are zeros.
 417  *
 418  * CCK rates are only valid in legacy table and will only be used in G
 419  * (2.4 GHz) band.
 420  */
 421
 422 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 423         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 424 };
 425
 426 /* Expected TpT tables. 4 indexes:
 427  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 428  */
 429 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 430         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 431         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 432         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 433         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 434 };
 435
 436 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 437         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 438         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 439         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 440         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 441 };
 442
 443 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 444         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 445         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 446         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 447         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 448 };
 449
 450 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 451         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 452         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 453         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 454         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 455 };
 456
 457 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 458         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 459         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 460         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 461         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 462 };
 463
 464 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 465         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 466         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 467         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 468         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 469 };
 470
 471 /* mbps, mcs */
 472 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 473         {  "1", "BPSK DSSS"},
 474         {  "2", "QPSK DSSS"},
 475         {"5.5", "BPSK CCK"},
 476         { "11", "QPSK CCK"},
 477         {  "6", "BPSK 1/2"},
 478         {  "9", "BPSK 1/2"},
 479         { "12", "QPSK 1/2"},
 480         { "18", "QPSK 3/4"},
 481         { "24", "16QAM 1/2"},
 482         { "36", "16QAM 3/4"},
 483         { "48", "64QAM 2/3"},
 484         { "54", "64QAM 3/4"},
 485         { "60", "64QAM 5/6"},
 486 };
 487
 488 #define MCS_INDEX_PER_STREAM    (8)
 489
 490 static const char *rs_pretty_ant(u8 ant)
 491 {
 492         static const char * const ant_name[] = {
 493                 [ANT_NONE] = "None",
 494                 [ANT_A]    = "A",
 495                 [ANT_B]    = "B",
 496                 [ANT_AB]   = "AB",
 497                 [ANT_C]    = "C",
 498                 [ANT_AC]   = "AC",
 499                 [ANT_BC]   = "BC",
 500                 [ANT_ABC]  = "ABC",
 501         };
 502
 503         if (ant > ANT_ABC)
 504                 return "UNKNOWN";
 505
 506         return ant_name[ant];
 507 }
 508
 509 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 510 {
 511         static const char * const lq_types[] = {
 512                 [LQ_NONE] = "NONE",
 513                 [LQ_LEGACY_A] = "LEGACY_A",
 514                 [LQ_LEGACY_G] = "LEGACY_G",
 515                 [LQ_HT_SISO] = "HT SISO",
 516                 [LQ_HT_MIMO2] = "HT MIMO",
 517                 [LQ_VHT_SISO] = "VHT SISO",
 518                 [LQ_VHT_MIMO2] = "VHT MIMO",
 519         };
 520
 521         if (type < LQ_NONE || type >= LQ_MAX)
 522                 return "UNKNOWN";
 523
 524         return lq_types[type];
 525 }
 526
 527 static char *rs_pretty_rate(const struct rs_rate *rate)
 528 {
 529         static char buf[40];
 530         static const char * const legacy_rates[] = {
 531                 [IWL_RATE_1M_INDEX] = "1M",
 532                 [IWL_RATE_2M_INDEX] = "2M",
 533                 [IWL_RATE_5M_INDEX] = "5.5M",
 534                 [IWL_RATE_11M_INDEX] = "11M",
 535                 [IWL_RATE_6M_INDEX] = "6M",
 536                 [IWL_RATE_9M_INDEX] = "9M",
 537                 [IWL_RATE_12M_INDEX] = "12M",
 538                 [IWL_RATE_18M_INDEX] = "18M",
 539                 [IWL_RATE_24M_INDEX] = "24M",
 540                 [IWL_RATE_36M_INDEX] = "36M",
 541                 [IWL_RATE_48M_INDEX] = "48M",
 542                 [IWL_RATE_54M_INDEX] = "54M",
 543         };
 544         static const char *const ht_vht_rates[] = {
 545                 [IWL_RATE_MCS_0_INDEX] = "MCS0",
 546                 [IWL_RATE_MCS_1_INDEX] = "MCS1",
 547                 [IWL_RATE_MCS_2_INDEX] = "MCS2",
 548                 [IWL_RATE_MCS_3_INDEX] = "MCS3",
 549                 [IWL_RATE_MCS_4_INDEX] = "MCS4",
 550                 [IWL_RATE_MCS_5_INDEX] = "MCS5",
 551                 [IWL_RATE_MCS_6_INDEX] = "MCS6",
 552                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
 553                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
 554                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
 555         };
 556         const char *rate_str;
 557
 558         if (is_type_legacy(rate->type))
 559                 rate_str = legacy_rates[rate->index];
 560         else if (is_type_ht(rate->type) || is_type_vht(rate->type))
 561                 rate_str = ht_vht_rates[rate->index];
 562         else
 563                 rate_str = "BAD_RATE";
 564
 565         sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
 566                 rs_pretty_ant(rate->ant), rate_str);
 567         return buf;
 568 }
 569
 570 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 571                                 const char *prefix)
 572 {
 573         IWL_DEBUG_RATE(mvm,
 574                        "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
 575                        prefix, rs_pretty_rate(rate), rate->bw,
 576                        rate->sgi, rate->ldpc, rate->stbc);
 577 }
 578
 579 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 580 {
 581         window->data = 0;
 582         window->success_counter = 0;
 583         window->success_ratio = IWL_INVALID_VALUE;
 584         window->counter = 0;
 585         window->average_tpt = IWL_INVALID_VALUE;
 586 }
 587
 588 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 589                                             struct iwl_scale_tbl_info *tbl)
 590 {
 591         int i;
 592
 593         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 594         for (i = 0; i < IWL_RATE_COUNT; i++)
 595                 rs_rate_scale_clear_window(&tbl->win[i]);
 596
 597         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 598                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 599 }
 600
 601 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 602 {
 603         return (ant_type & valid_antenna) == ant_type;
 604 }
 605
 606 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 607                                      struct iwl_lq_sta *lq_data, u8 tid,
 608                                      struct ieee80211_sta *sta)
 609 {
 610         int ret = -EAGAIN;
 611
 612         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 613                      sta->addr, tid);
 614         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 615         if (ret == -EAGAIN) {
 616                 /*
 617                  * driver and mac80211 is out of sync
 618                  * this might be cause by reloading firmware
 619                  * stop the tx ba session here
 620                  */
 621                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 622                         tid);
 623                 ieee80211_stop_tx_ba_session(sta, tid);
 624         }
 625         return ret;
 626 }
 627
 628 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 629                               struct iwl_lq_sta *lq_data,
 630                               struct ieee80211_sta *sta)
 631 {
 632         if (tid < IWL_MAX_TID_COUNT)
 633                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 634         else
 635                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 636                         tid, IWL_MAX_TID_COUNT);
 637 }
 638
 639 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 640 {
 641         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 642                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 643                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 644 }
 645
 646 /*
 647  * Static function to get the expected throughput from an iwl_scale_tbl_info
 648  * that wraps a NULL pointer check
 649  */
 650 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 651 {
 652         if (tbl->expected_tpt)
 653                 return tbl->expected_tpt[rs_index];
 654         return 0;
 655 }
 656
 657 /**
 658  * rs_collect_tx_data - Update the success/failure sliding window
 659  *
 660  * We keep a sliding window of the last 62 packets transmitted
 661  * at this rate.  window->data contains the bitmask of successful
 662  * packets.
 663  */
 664 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
 665                                struct iwl_scale_tbl_info *tbl,
 666                                int scale_index, int attempts, int successes,
 667                                struct iwl_rate_scale_data *window)
 668 {
 669         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 670         s32 fail_count, tpt;
 671
 672         /* Get expected throughput */
 673         tpt = get_expected_tpt(tbl, scale_index);
 674
 675         /*
 676          * Keep track of only the latest 62 tx frame attempts in this rate's
 677          * history window; anything older isn't really relevant any more.
 678          * If we have filled up the sliding window, drop the oldest attempt;
 679          * if the oldest attempt (highest bit in bitmap) shows "success",
 680          * subtract "1" from the success counter (this is the main reason
 681          * we keep these bitmaps!).
 682          */
 683         while (attempts > 0) {
 684                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 685                         /* remove earliest */
 686                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 687
 688                         if (window->data & mask) {
 689                                 window->data &= ~mask;
 690                                 window->success_counter--;
 691                         }
 692                 }
 693
 694                 /* Increment frames-attempted counter */
 695                 window->counter++;
 696
 697                 /* Shift bitmap by one frame to throw away oldest history */
 698                 window->data <<= 1;
 699
 700                 /* Mark the most recent #successes attempts as successful */
 701                 if (successes > 0) {
 702                         window->success_counter++;
 703                         window->data |= 0x1;
 704                         successes--;
 705                 }
 706
 707                 attempts--;
 708         }
 709
 710         /* Calculate current success ratio, avoid divide-by-0! */
 711         if (window->counter > 0)
 712                 window->success_ratio = 128 * (100 * window->success_counter)
 713                                         / window->counter;
 714         else
 715                 window->success_ratio = IWL_INVALID_VALUE;
 716
 717         fail_count = window->counter - window->success_counter;
 718
 719         /* Calculate average throughput, if we have enough history. */
 720         if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
 721             (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
 722                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 723         else
 724                 window->average_tpt = IWL_INVALID_VALUE;
 725
 726         return 0;
 727 }
 728
 729 static int rs_collect_tx_data(struct iwl_mvm *mvm,
 730                               struct iwl_lq_sta *lq_sta,
 731                               struct iwl_scale_tbl_info *tbl,
 732                               int scale_index, int attempts, int successes,
 733                               u8 reduced_txp)
 734 {
 735         struct iwl_rate_scale_data *window = NULL;
 736         int ret;
 737
 738         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 739                 return -EINVAL;
 740
 741         if (tbl->column != RS_COLUMN_INVALID) {
 742                 struct lq_sta_pers *pers = &lq_sta->pers;
 743
 744                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 745                 pers->tx_stats[tbl->column][scale_index].success += successes;
 746         }
 747
 748         /* Select window for current tx bit rate */
 749         window = &(tbl->win[scale_index]);
 750
 751         ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 752                                   window);
 753         if (ret)
 754                 return ret;
 755
 756         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 757                 return -EINVAL;
 758
 759         window = &tbl->tpc_win[reduced_txp];
 760         return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 761                                    window);
 762 }
 763
 764 /* Convert rs_rate object into ucode rate bitmask */
 765 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 766                                   struct rs_rate *rate)
 767 {
 768         u32 ucode_rate = 0;
 769         int index = rate->index;
 770
 771         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 772                          RATE_MCS_ANT_ABC_MSK);
 773
 774         if (is_legacy(rate)) {
 775                 ucode_rate |= iwl_rates[index].plcp;
 776                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 777                         ucode_rate |= RATE_MCS_CCK_MSK;
 778                 return ucode_rate;
 779         }
 780
 781         if (is_ht(rate)) {
 782                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 783                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 784                         index = IWL_LAST_HT_RATE;
 785                 }
 786                 ucode_rate |= RATE_MCS_HT_MSK;
 787
 788                 if (is_ht_siso(rate))
 789                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 790                 else if (is_ht_mimo2(rate))
 791                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 792                 else
 793                         WARN_ON_ONCE(1);
 794         } else if (is_vht(rate)) {
 795                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 796                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 797                         index = IWL_LAST_VHT_RATE;
 798                 }
 799                 ucode_rate |= RATE_MCS_VHT_MSK;
 800                 if (is_vht_siso(rate))
 801                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 802                 else if (is_vht_mimo2(rate))
 803                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 804                 else
 805                         WARN_ON_ONCE(1);
 806
 807         } else {
 808                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 809         }
 810
 811         if (is_siso(rate) && rate->stbc) {
 812                 /* To enable STBC we need to set both a flag and ANT_AB */
 813                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 814                 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
 815         }
 816
 817         ucode_rate |= rate->bw;
 818         if (rate->sgi)
 819                 ucode_rate |= RATE_MCS_SGI_MSK;
 820         if (rate->ldpc)
 821                 ucode_rate |= RATE_MCS_LDPC_MSK;
 822
 823         return ucode_rate;
 824 }
 825
 826 /* Convert a ucode rate into an rs_rate object */
 827 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 828                                    enum ieee80211_band band,
 829                                    struct rs_rate *rate)
 830 {
 831         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 832         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 833         u8 nss;
 834
 835         memset(rate, 0, sizeof(*rate));
 836         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 837
 838         if (rate->index == IWL_RATE_INVALID)
 839                 return -EINVAL;
 840
 841         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 842
 843         /* Legacy */
 844         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 845             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 846                 if (num_of_ant == 1) {
 847                         if (band == IEEE80211_BAND_5GHZ)
 848                                 rate->type = LQ_LEGACY_A;
 849                         else
 850                                 rate->type = LQ_LEGACY_G;
 851                 }
 852
 853                 return 0;
 854         }
 855
 856         /* HT or VHT */
 857         if (ucode_rate & RATE_MCS_SGI_MSK)
 858                 rate->sgi = true;
 859         if (ucode_rate & RATE_MCS_LDPC_MSK)
 860                 rate->ldpc = true;
 861         if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
 862                 rate->stbc = true;
 863         if (ucode_rate & RATE_MCS_BF_MSK)
 864                 rate->bfer = true;
 865
 866         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 867
 868         if (ucode_rate & RATE_MCS_HT_MSK) {
 869                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 870                        RATE_HT_MCS_NSS_POS) + 1;
 871
 872                 if (nss == 1) {
 873                         rate->type = LQ_HT_SISO;
 874                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 875                                   "stbc %d bfer %d",
 876                                   rate->stbc, rate->bfer);
 877                 } else if (nss == 2) {
 878                         rate->type = LQ_HT_MIMO2;
 879                         WARN_ON_ONCE(num_of_ant != 2);
 880                 } else {
 881                         WARN_ON_ONCE(1);
 882                 }
 883         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 884                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 885                        RATE_VHT_MCS_NSS_POS) + 1;
 886
 887                 if (nss == 1) {
 888                         rate->type = LQ_VHT_SISO;
 889                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 890                                   "stbc %d bfer %d",
 891                                   rate->stbc, rate->bfer);
 892                 } else if (nss == 2) {
 893                         rate->type = LQ_VHT_MIMO2;
 894                         WARN_ON_ONCE(num_of_ant != 2);
 895                 } else {
 896                         WARN_ON_ONCE(1);
 897                 }
 898         }
 899
 900         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
 901         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 902                      !is_vht(rate));
 903
 904         return 0;
 905 }
 906
 907 /* switch to another antenna/antennas and return 1 */
 908 /* if no other valid antenna found, return 0 */
 909 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 910 {
 911         u8 new_ant_type;
 912
 913         if (!rate->ant || rate->ant > ANT_ABC)
 914                 return 0;
 915
 916         if (!rs_is_valid_ant(valid_ant, rate->ant))
 917                 return 0;
 918
 919         new_ant_type = ant_toggle_lookup[rate->ant];
 920
 921         while ((new_ant_type != rate->ant) &&
 922                !rs_is_valid_ant(valid_ant, new_ant_type))
 923                 new_ant_type = ant_toggle_lookup[new_ant_type];
 924
 925         if (new_ant_type == rate->ant)
 926                 return 0;
 927
 928         rate->ant = new_ant_type;
 929
 930         return 1;
 931 }
 932
 933 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 934                                   struct rs_rate *rate)
 935 {
 936         if (is_legacy(rate))
 937                 return lq_sta->active_legacy_rate;
 938         else if (is_siso(rate))
 939                 return lq_sta->active_siso_rate;
 940         else if (is_mimo2(rate))
 941                 return lq_sta->active_mimo2_rate;
 942
 943         WARN_ON_ONCE(1);
 944         return 0;
 945 }
 946
 947 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 948                                 int rate_type)
 949 {
 950         u8 high = IWL_RATE_INVALID;
 951         u8 low = IWL_RATE_INVALID;
 952
 953         /* 802.11A or ht walks to the next literal adjacent rate in
 954          * the rate table */
 955         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 956                 int i;
 957                 u32 mask;
 958
 959                 /* Find the previous rate that is in the rate mask */
 960                 i = index - 1;
 961                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 962                         if (rate_mask & mask) {
 963                                 low = i;
 964                                 break;
 965                         }
 966                 }
 967
 968                 /* Find the next rate that is in the rate mask */
 969                 i = index + 1;
 970                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 971                         if (rate_mask & mask) {
 972                                 high = i;
 973                                 break;
 974                         }
 975                 }
 976
 977                 return (high << 8) | low;
 978         }
 979
 980         low = index;
 981         while (low != IWL_RATE_INVALID) {
 982                 low = iwl_rates[low].prev_rs;
 983                 if (low == IWL_RATE_INVALID)
 984                         break;
 985                 if (rate_mask & (1 << low))
 986                         break;
 987         }
 988
 989         high = index;
 990         while (high != IWL_RATE_INVALID) {
 991                 high = iwl_rates[high].next_rs;
 992                 if (high == IWL_RATE_INVALID)
 993                         break;
 994                 if (rate_mask & (1 << high))
 995                         break;
 996         }
 997
 998         return (high << 8) | low;
 999 }
1000
1001 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1002                                      struct rs_rate *rate)
1003 {
1004         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1005 }
1006
1007 /* Get the next supported lower rate in the current column.
1008  * Return true if bottom rate in the current column was reached
1009  */
1010 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1011                                         struct rs_rate *rate)
1012 {
1013         u8 low;
1014         u16 high_low;
1015         u16 rate_mask;
1016         struct iwl_mvm *mvm = lq_sta->pers.drv;
1017
1018         rate_mask = rs_get_supported_rates(lq_sta, rate);
1019         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1020                                         rate->type);
1021         low = high_low & 0xff;
1022
1023         /* Bottom rate of column reached */
1024         if (low == IWL_RATE_INVALID)
1025                 return true;
1026
1027         rate->index = low;
1028         return false;
1029 }
1030
1031 /* Get the next rate to use following a column downgrade */
1032 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1033                                           struct rs_rate *rate)
1034 {
1035         struct iwl_mvm *mvm = lq_sta->pers.drv;
1036
1037         if (is_legacy(rate)) {
1038                 /* No column to downgrade from Legacy */
1039                 return;
1040         } else if (is_siso(rate)) {
1041                 /* Downgrade to Legacy if we were in SISO */
1042                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1043                         rate->type = LQ_LEGACY_A;
1044                 else
1045                         rate->type = LQ_LEGACY_G;
1046
1047                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1048
1049                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1050                              rate->index > IWL_RATE_MCS_9_INDEX);
1051
1052                 rate->index = rs_ht_to_legacy[rate->index];
1053                 rate->ldpc = false;
1054         } else {
1055                 /* Downgrade to SISO with same MCS if in MIMO  */
1056                 rate->type = is_vht_mimo2(rate) ?
1057                         LQ_VHT_SISO : LQ_HT_SISO;
1058         }
1059
1060         if (num_of_ant(rate->ant) > 1)
1061                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1062
1063         /* Relevant in both switching to SISO or Legacy */
1064         rate->sgi = false;
1065
1066         if (!rs_rate_supported(lq_sta, rate))
1067                 rs_get_lower_rate_in_column(lq_sta, rate);
1068 }
1069
1070 /* Check if both rates are identical
1071  * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1072  * with a rate indicating STBC/BFER and ANT_AB.
1073  */
1074 static inline bool rs_rate_equal(struct rs_rate *a,
1075                                  struct rs_rate *b,
1076                                  bool allow_ant_mismatch)
1077
1078 {
1079         bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1080                 (a->bfer == b->bfer);
1081
1082         if (allow_ant_mismatch) {
1083                 if (a->stbc || a->bfer) {
1084                         WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1085                                   a->stbc, a->bfer, a->ant);
1086                         ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1087                 } else if (b->stbc || b->bfer) {
1088                         WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1089                                   b->stbc, b->bfer, b->ant);
1090                         ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1091                 }
1092         }
1093
1094         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1095                 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1096 }
1097
1098 /* Check if both rates share the same column */
1099 static inline bool rs_rate_column_match(struct rs_rate *a,
1100                                         struct rs_rate *b)
1101 {
1102         bool ant_match;
1103
1104         if (a->stbc || a->bfer)
1105                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1106         else
1107                 ant_match = (a->ant == b->ant);
1108
1109         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1110                 && ant_match;
1111 }
1112
1113 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1114 {
1115         if (is_legacy(rate)) {
1116                 if (rate->ant == ANT_A)
1117                         return RS_COLUMN_LEGACY_ANT_A;
1118
1119                 if (rate->ant == ANT_B)
1120                         return RS_COLUMN_LEGACY_ANT_B;
1121
1122                 goto err;
1123         }
1124
1125         if (is_siso(rate)) {
1126                 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1127                         return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1128                                 RS_COLUMN_SISO_ANT_A;
1129
1130                 if (rate->ant == ANT_B)
1131                         return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1132                                 RS_COLUMN_SISO_ANT_B;
1133
1134                 goto err;
1135         }
1136
1137         if (is_mimo(rate))
1138                 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1139
1140 err:
1141         return RS_COLUMN_INVALID;
1142 }
1143
1144 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1145 {
1146         u8 tid = IWL_MAX_TID_COUNT;
1147
1148         if (ieee80211_is_data_qos(hdr->frame_control)) {
1149                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1150                 tid = qc[0] & 0xf;
1151         }
1152
1153         if (unlikely(tid > IWL_MAX_TID_COUNT))
1154                 tid = IWL_MAX_TID_COUNT;
1155
1156         return tid;
1157 }
1158
1159 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1160                           int tid, struct ieee80211_tx_info *info)
1161 {
1162         int legacy_success;
1163         int retries;
1164         int i;
1165         struct iwl_lq_cmd *table;
1166         u32 lq_hwrate;
1167         struct rs_rate lq_rate, tx_resp_rate;
1168         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1169         u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1170         u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1171         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1172         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1173         bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa,
1174                                              IWL_UCODE_TLV_API_LQ_SS_PARAMS);
1175
1176         /* Treat uninitialized rate scaling data same as non-existing. */
1177         if (!lq_sta) {
1178                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1179                 return;
1180         } else if (!lq_sta->pers.drv) {
1181                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1182                 return;
1183         }
1184
1185         /* This packet was aggregated but doesn't carry status info */
1186         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1187             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1188                 return;
1189
1190         rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1191
1192 #ifdef CONFIG_MAC80211_DEBUGFS
1193         /* Disable last tx check if we are debugging with fixed rate but
1194          * update tx stats */
1195         if (lq_sta->pers.dbg_fixed_rate) {
1196                 int index = tx_resp_rate.index;
1197                 enum rs_column column;
1198                 int attempts, success;
1199
1200                 column = rs_get_column_from_rate(&tx_resp_rate);
1201                 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1202                               "Can't map rate 0x%x to column",
1203                               tx_resp_hwrate))
1204                         return;
1205
1206                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1207                         attempts = info->status.ampdu_len;
1208                         success = info->status.ampdu_ack_len;
1209                 } else {
1210                         attempts = info->status.rates[0].count;
1211                         success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1212                 }
1213
1214                 lq_sta->pers.tx_stats[column][index].total += attempts;
1215                 lq_sta->pers.tx_stats[column][index].success += success;
1216
1217                 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1218                                tx_resp_hwrate, success, attempts);
1219                 return;
1220         }
1221 #endif
1222
1223         if (time_after(jiffies,
1224                        (unsigned long)(lq_sta->last_tx +
1225                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1226                 int t;
1227
1228                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1229                 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1230                         ieee80211_stop_tx_ba_session(sta, t);
1231
1232                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1233                 return;
1234         }
1235         lq_sta->last_tx = jiffies;
1236
1237         /* Ignore this Tx frame response if its initial rate doesn't match
1238          * that of latest Link Quality command.  There may be stragglers
1239          * from a previous Link Quality command, but we're no longer interested
1240          * in those; they're either from the "active" mode while we're trying
1241          * to check "search" mode, or a prior "search" mode after we've moved
1242          * to a new "search" mode (which might become the new "active" mode).
1243          */
1244         table = &lq_sta->lq;
1245         lq_hwrate = le32_to_cpu(table->rs_table[0]);
1246         rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1247
1248         /* Here we actually compare this rate to the latest LQ command */
1249         if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1250                 IWL_DEBUG_RATE(mvm,
1251                                "initial tx resp rate 0x%x does not match 0x%x\n",
1252                                tx_resp_hwrate, lq_hwrate);
1253
1254                 /*
1255                  * Since rates mis-match, the last LQ command may have failed.
1256                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1257                  * ... driver.
1258                  */
1259                 lq_sta->missed_rate_counter++;
1260                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1261                         lq_sta->missed_rate_counter = 0;
1262                         IWL_DEBUG_RATE(mvm,
1263                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1264                                        lq_sta->rs_state);
1265                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1266                 }
1267                 /* Regardless, ignore this status info for outdated rate */
1268                 return;
1269         } else
1270                 /* Rate did match, so reset the missed_rate_counter */
1271                 lq_sta->missed_rate_counter = 0;
1272
1273         if (!lq_sta->search_better_tbl) {
1274                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1275                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1276         } else {
1277                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1278                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1279         }
1280
1281         if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1282                 IWL_DEBUG_RATE(mvm,
1283                                "Neither active nor search matches tx rate\n");
1284                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1285                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1286                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1287                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1288                 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1289
1290                 /*
1291                  * no matching table found, let's by-pass the data collection
1292                  * and continue to perform rate scale to find the rate table
1293                  */
1294                 rs_stay_in_table(lq_sta, true);
1295                 goto done;
1296         }
1297
1298         /*
1299          * Updating the frame history depends on whether packets were
1300          * aggregated.
1301          *
1302          * For aggregation, all packets were transmitted at the same rate, the
1303          * first index into rate scale table.
1304          */
1305         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1306                 /* ampdu_ack_len = 0 marks no BA was received. In this case
1307                  * treat it as a single frame loss as we don't want the success
1308                  * ratio to dip too quickly because a BA wasn't received
1309                  */
1310                 if (info->status.ampdu_ack_len == 0)
1311                         info->status.ampdu_len = 1;
1312
1313                 rs_collect_tx_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1314                                    info->status.ampdu_len,
1315                                    info->status.ampdu_ack_len,
1316                                    reduced_txp);
1317
1318                 /* Update success/fail counts if not searching for new mode */
1319                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1320                         lq_sta->total_success += info->status.ampdu_ack_len;
1321                         lq_sta->total_failed += (info->status.ampdu_len -
1322                                         info->status.ampdu_ack_len);
1323                 }
1324         } else {
1325                 /* For legacy, update frame history with for each Tx retry. */
1326                 retries = info->status.rates[0].count - 1;
1327                 /* HW doesn't send more than 15 retries */
1328                 retries = min(retries, 15);
1329
1330                 /* The last transmission may have been successful */
1331                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1332                 /* Collect data for each rate used during failed TX attempts */
1333                 for (i = 0; i <= retries; ++i) {
1334                         lq_hwrate = le32_to_cpu(table->rs_table[i]);
1335                         rs_rate_from_ucode_rate(lq_hwrate, info->band,
1336                                                 &lq_rate);
1337                         /*
1338                          * Only collect stats if retried rate is in the same RS
1339                          * table as active/search.
1340                          */
1341                         if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1342                                 tmp_tbl = curr_tbl;
1343                         else if (rs_rate_column_match(&lq_rate,
1344                                                       &other_tbl->rate))
1345                                 tmp_tbl = other_tbl;
1346                         else
1347                                 continue;
1348
1349                         rs_collect_tx_data(mvm, lq_sta, tmp_tbl, lq_rate.index,
1350                                            1, i < retries ? 0 : legacy_success,
1351                                            reduced_txp);
1352                 }
1353
1354                 /* Update success/fail counts if not searching for new mode */
1355                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1356                         lq_sta->total_success += legacy_success;
1357                         lq_sta->total_failed += retries + (1 - legacy_success);
1358                 }
1359         }
1360         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1361         lq_sta->last_rate_n_flags = lq_hwrate;
1362         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1363 done:
1364         /* See if there's a better rate or modulation mode to try. */
1365         if (sta->supp_rates[info->band])
1366                 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1367 }
1368
1369 /*
1370  * mac80211 sends us Tx status
1371  */
1372 static void rs_mac80211_tx_status(void *mvm_r,
1373                                   struct ieee80211_supported_band *sband,
1374                                   struct ieee80211_sta *sta, void *priv_sta,
1375                                   struct sk_buff *skb)
1376 {
1377         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1378         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1379         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1380         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1381
1382         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1383                 return;
1384
1385         if (!ieee80211_is_data(hdr->frame_control) ||
1386             info->flags & IEEE80211_TX_CTL_NO_ACK)
1387                 return;
1388
1389         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1390 }
1391
1392 /*
1393  * Begin a period of staying with a selected modulation mode.
1394  * Set "stay_in_tbl" flag to prevent any mode switches.
1395  * Set frame tx success limits according to legacy vs. high-throughput,
1396  * and reset overall (spanning all rates) tx success history statistics.
1397  * These control how long we stay using same modulation mode before
1398  * searching for a new mode.
1399  */
1400 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1401                                  struct iwl_lq_sta *lq_sta)
1402 {
1403         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1404         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1405         if (is_legacy) {
1406                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1407                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1408                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1409         } else {
1410                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1411                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1412                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1413         }
1414         lq_sta->table_count = 0;
1415         lq_sta->total_failed = 0;
1416         lq_sta->total_success = 0;
1417         lq_sta->flush_timer = jiffies;
1418         lq_sta->visited_columns = 0;
1419 }
1420
1421 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1422 {
1423         if (rate_mask)
1424                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1425         return IWL_RATE_INVALID;
1426 }
1427
1428 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1429                                    const struct rs_tx_column *column)
1430 {
1431         switch (column->mode) {
1432         case RS_LEGACY:
1433                 return lq_sta->max_legacy_rate_idx;
1434         case RS_SISO:
1435                 return lq_sta->max_siso_rate_idx;
1436         case RS_MIMO2:
1437                 return lq_sta->max_mimo2_rate_idx;
1438         default:
1439                 WARN_ON_ONCE(1);
1440         }
1441
1442         return lq_sta->max_legacy_rate_idx;
1443 }
1444
1445 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1446                                             const struct rs_tx_column *column,
1447                                             u32 bw)
1448 {
1449         /* Used to choose among HT tables */
1450         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1451
1452         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1453                          column->mode != RS_SISO &&
1454                          column->mode != RS_MIMO2))
1455                 return expected_tpt_legacy;
1456
1457         /* Legacy rates have only one table */
1458         if (column->mode == RS_LEGACY)
1459                 return expected_tpt_legacy;
1460
1461         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1462         /* Choose among many HT tables depending on number of streams
1463          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1464          * status */
1465         if (column->mode == RS_SISO) {
1466                 switch (bw) {
1467                 case RATE_MCS_CHAN_WIDTH_20:
1468                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1469                         break;
1470                 case RATE_MCS_CHAN_WIDTH_40:
1471                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1472                         break;
1473                 case RATE_MCS_CHAN_WIDTH_80:
1474                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1475                         break;
1476                 default:
1477                         WARN_ON_ONCE(1);
1478                 }
1479         } else if (column->mode == RS_MIMO2) {
1480                 switch (bw) {
1481                 case RATE_MCS_CHAN_WIDTH_20:
1482                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1483                         break;
1484                 case RATE_MCS_CHAN_WIDTH_40:
1485                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1486                         break;
1487                 case RATE_MCS_CHAN_WIDTH_80:
1488                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1489                         break;
1490                 default:
1491                         WARN_ON_ONCE(1);
1492                 }
1493         } else {
1494                 WARN_ON_ONCE(1);
1495         }
1496
1497         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1498                 return ht_tbl_pointer[0];
1499         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1500                 return ht_tbl_pointer[1];
1501         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1502                 return ht_tbl_pointer[2];
1503         else                                            /* AGG+SGI */
1504                 return ht_tbl_pointer[3];
1505 }
1506
1507 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1508                                       struct iwl_scale_tbl_info *tbl)
1509 {
1510         struct rs_rate *rate = &tbl->rate;
1511         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1512
1513         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1514 }
1515
1516 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1517                             struct iwl_lq_sta *lq_sta,
1518                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1519                             unsigned long rate_mask, s8 index)
1520 {
1521         struct iwl_scale_tbl_info *active_tbl =
1522             &(lq_sta->lq_info[lq_sta->active_tbl]);
1523         s32 success_ratio = active_tbl->win[index].success_ratio;
1524         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1525         const u16 *tpt_tbl = tbl->expected_tpt;
1526         u16 high_low;
1527         u32 target_tpt;
1528         int rate_idx;
1529
1530         if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1531                 target_tpt = 100 * expected_current_tpt;
1532                 IWL_DEBUG_RATE(mvm,
1533                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1534                                success_ratio, target_tpt);
1535         } else {
1536                 target_tpt = lq_sta->last_tpt;
1537                 IWL_DEBUG_RATE(mvm,
1538                                "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1539                                success_ratio, target_tpt);
1540         }
1541
1542         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1543
1544         while (rate_idx != IWL_RATE_INVALID) {
1545                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1546                         break;
1547
1548                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1549                                                 tbl->rate.type);
1550
1551                 rate_idx = (high_low >> 8) & 0xff;
1552         }
1553
1554         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1555                        rate_idx, target_tpt,
1556                        rate_idx != IWL_RATE_INVALID ?
1557                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1558
1559         return rate_idx;
1560 }
1561
1562 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1563 {
1564         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1565                 return RATE_MCS_CHAN_WIDTH_80;
1566         else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1567                 return RATE_MCS_CHAN_WIDTH_40;
1568
1569         return RATE_MCS_CHAN_WIDTH_20;
1570 }
1571
1572 /*
1573  * Check whether we should continue using same modulation mode, or
1574  * begin search for a new mode, based on:
1575  * 1) # tx successes or failures while using this mode
1576  * 2) # times calling this function
1577  * 3) elapsed time in this mode (not used, for now)
1578  */
1579 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1580 {
1581         struct iwl_scale_tbl_info *tbl;
1582         int active_tbl;
1583         int flush_interval_passed = 0;
1584         struct iwl_mvm *mvm;
1585
1586         mvm = lq_sta->pers.drv;
1587         active_tbl = lq_sta->active_tbl;
1588
1589         tbl = &(lq_sta->lq_info[active_tbl]);
1590
1591         /* If we've been disallowing search, see if we should now allow it */
1592         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1593                 /* Elapsed time using current modulation mode */
1594                 if (lq_sta->flush_timer)
1595                         flush_interval_passed =
1596                                 time_after(jiffies,
1597                                            (unsigned long)(lq_sta->flush_timer +
1598                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1599
1600                 /*
1601                  * Check if we should allow search for new modulation mode.
1602                  * If many frames have failed or succeeded, or we've used
1603                  * this same modulation for a long time, allow search, and
1604                  * reset history stats that keep track of whether we should
1605                  * allow a new search.  Also (below) reset all bitmaps and
1606                  * stats in active history.
1607                  */
1608                 if (force_search ||
1609                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1610                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1611                     ((!lq_sta->search_better_tbl) &&
1612                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1613                         IWL_DEBUG_RATE(mvm,
1614                                        "LQ: stay is expired %d %d %d\n",
1615                                      lq_sta->total_failed,
1616                                      lq_sta->total_success,
1617                                      flush_interval_passed);
1618
1619                         /* Allow search for new mode */
1620                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1621                         IWL_DEBUG_RATE(mvm,
1622                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1623                         lq_sta->total_failed = 0;
1624                         lq_sta->total_success = 0;
1625                         lq_sta->flush_timer = 0;
1626                         /* mark the current column as visited */
1627                         lq_sta->visited_columns = BIT(tbl->column);
1628                 /*
1629                  * Else if we've used this modulation mode enough repetitions
1630                  * (regardless of elapsed time or success/failure), reset
1631                  * history bitmaps and rate-specific stats for all rates in
1632                  * active table.
1633                  */
1634                 } else {
1635                         lq_sta->table_count++;
1636                         if (lq_sta->table_count >=
1637                             lq_sta->table_count_limit) {
1638                                 lq_sta->table_count = 0;
1639
1640                                 IWL_DEBUG_RATE(mvm,
1641                                                "LQ: stay in table clear win\n");
1642                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1643                         }
1644                 }
1645
1646                 /* If transitioning to allow "search", reset all history
1647                  * bitmaps and stats in active table (this will become the new
1648                  * "search" table). */
1649                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1650                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1651                 }
1652         }
1653 }
1654
1655 /*
1656  * setup rate table in uCode
1657  */
1658 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1659                                struct ieee80211_sta *sta,
1660                                struct iwl_lq_sta *lq_sta,
1661                                struct iwl_scale_tbl_info *tbl)
1662 {
1663         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1664         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1665 }
1666
1667 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1668                               struct ieee80211_sta *sta,
1669                               struct iwl_lq_sta *lq_sta,
1670                               struct iwl_scale_tbl_info *tbl,
1671                               enum rs_action scale_action)
1672 {
1673         if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1674                 return false;
1675
1676         if (!is_vht_siso(&tbl->rate))
1677                 return false;
1678
1679         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1680             (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1681             (scale_action == RS_ACTION_DOWNSCALE)) {
1682                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1683                 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1684                 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1685                 goto tweaked;
1686         }
1687
1688         /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1689          * sustainable, i.e. we're past the test window. We can't go back
1690          * if MCS5 is just tested as this will happen always after switching
1691          * to 20Mhz MCS4 because the rate stats are cleared.
1692          */
1693         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1694             (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1695              (scale_action == RS_ACTION_STAY)) ||
1696              ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1697               (scale_action == RS_ACTION_UPSCALE)))) {
1698                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1699                 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1700                 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1701                 goto tweaked;
1702         }
1703
1704         return false;
1705
1706 tweaked:
1707         rs_set_expected_tpt_table(lq_sta, tbl);
1708         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1709         return true;
1710 }
1711
1712 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1713                                          struct iwl_lq_sta *lq_sta,
1714                                          struct ieee80211_sta *sta,
1715                                          struct iwl_scale_tbl_info *tbl)
1716 {
1717         int i, j, max_rate;
1718         enum rs_column next_col_id;
1719         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1720         const struct rs_tx_column *next_col;
1721         allow_column_func_t allow_func;
1722         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1723         const u16 *expected_tpt_tbl;
1724         u16 tpt, max_expected_tpt;
1725
1726         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1727                 next_col_id = curr_col->next_columns[i];
1728
1729                 if (next_col_id == RS_COLUMN_INVALID)
1730                         continue;
1731
1732                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1733                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1734                                        next_col_id);
1735                         continue;
1736                 }
1737
1738                 next_col = &rs_tx_columns[next_col_id];
1739
1740                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1741                         IWL_DEBUG_RATE(mvm,
1742                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1743                                        next_col_id, valid_ants, next_col->ant);
1744                         continue;
1745                 }
1746
1747                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1748                         allow_func = next_col->checks[j];
1749                         if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1750                                                       next_col))
1751                                 break;
1752                 }
1753
1754                 if (j != MAX_COLUMN_CHECKS) {
1755                         IWL_DEBUG_RATE(mvm,
1756                                        "Skip column %d: not allowed (check %d failed)\n",
1757                                        next_col_id, j);
1758
1759                         continue;
1760                 }
1761
1762                 tpt = lq_sta->last_tpt / 100;
1763                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1764                                                      rs_bw_from_sta_bw(sta));
1765                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1766                         continue;
1767
1768                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1769                 if (max_rate == IWL_RATE_INVALID) {
1770                         IWL_DEBUG_RATE(mvm,
1771                                        "Skip column %d: no rate is allowed in this column\n",
1772                                        next_col_id);
1773                         continue;
1774                 }
1775
1776                 max_expected_tpt = expected_tpt_tbl[max_rate];
1777                 if (tpt >= max_expected_tpt) {
1778                         IWL_DEBUG_RATE(mvm,
1779                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1780                                        next_col_id, max_expected_tpt, tpt);
1781                         continue;
1782                 }
1783
1784                 IWL_DEBUG_RATE(mvm,
1785                                "Found potential column %d. Max expected %d current %d\n",
1786                                next_col_id, max_expected_tpt, tpt);
1787                 break;
1788         }
1789
1790         if (i == MAX_NEXT_COLUMNS)
1791                 return RS_COLUMN_INVALID;
1792
1793         return next_col_id;
1794 }
1795
1796 static int rs_switch_to_column(struct iwl_mvm *mvm,
1797                                struct iwl_lq_sta *lq_sta,
1798                                struct ieee80211_sta *sta,
1799                                enum rs_column col_id)
1800 {
1801         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1802         struct iwl_scale_tbl_info *search_tbl =
1803                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1804         struct rs_rate *rate = &search_tbl->rate;
1805         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1806         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1807         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1808                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1809         unsigned long rate_mask = 0;
1810         u32 rate_idx = 0;
1811
1812         memcpy(search_tbl, tbl, sz);
1813
1814         rate->sgi = column->sgi;
1815         rate->ant = column->ant;
1816
1817         if (column->mode == RS_LEGACY) {
1818                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1819                         rate->type = LQ_LEGACY_A;
1820                 else
1821                         rate->type = LQ_LEGACY_G;
1822
1823                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1824                 rate->ldpc = false;
1825                 rate_mask = lq_sta->active_legacy_rate;
1826         } else if (column->mode == RS_SISO) {
1827                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1828                 rate_mask = lq_sta->active_siso_rate;
1829         } else if (column->mode == RS_MIMO2) {
1830                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1831                 rate_mask = lq_sta->active_mimo2_rate;
1832         } else {
1833                 WARN_ON_ONCE("Bad column mode");
1834         }
1835
1836         if (column->mode != RS_LEGACY) {
1837                 rate->bw = rs_bw_from_sta_bw(sta);
1838                 rate->ldpc = lq_sta->ldpc;
1839         }
1840
1841         search_tbl->column = col_id;
1842         rs_set_expected_tpt_table(lq_sta, search_tbl);
1843
1844         lq_sta->visited_columns |= BIT(col_id);
1845
1846         /* Get the best matching rate if we're changing modes. e.g.
1847          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1848          */
1849         if (curr_column->mode != column->mode) {
1850                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1851                                             rate_mask, rate->index);
1852
1853                 if ((rate_idx == IWL_RATE_INVALID) ||
1854                     !(BIT(rate_idx) & rate_mask)) {
1855                         IWL_DEBUG_RATE(mvm,
1856                                        "can not switch with index %d"
1857                                        " rate mask %lx\n",
1858                                        rate_idx, rate_mask);
1859
1860                         goto err;
1861                 }
1862
1863                 rate->index = rate_idx;
1864         }
1865
1866         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1867                        col_id, rate->index);
1868
1869         return 0;
1870
1871 err:
1872         rate->type = LQ_NONE;
1873         return -1;
1874 }
1875
1876 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1877                                          struct iwl_scale_tbl_info *tbl,
1878                                          s32 sr, int low, int high,
1879                                          int current_tpt,
1880                                          int low_tpt, int high_tpt)
1881 {
1882         enum rs_action action = RS_ACTION_STAY;
1883
1884         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1885             (current_tpt == 0)) {
1886                 IWL_DEBUG_RATE(mvm,
1887                                "Decrease rate because of low SR\n");
1888                 return RS_ACTION_DOWNSCALE;
1889         }
1890
1891         if ((low_tpt == IWL_INVALID_VALUE) &&
1892             (high_tpt == IWL_INVALID_VALUE) &&
1893             (high != IWL_RATE_INVALID)) {
1894                 IWL_DEBUG_RATE(mvm,
1895                                "No data about high/low rates. Increase rate\n");
1896                 return RS_ACTION_UPSCALE;
1897         }
1898
1899         if ((high_tpt == IWL_INVALID_VALUE) &&
1900             (high != IWL_RATE_INVALID) &&
1901             (low_tpt != IWL_INVALID_VALUE) &&
1902             (low_tpt < current_tpt)) {
1903                 IWL_DEBUG_RATE(mvm,
1904                                "No data about high rate and low rate is worse. Increase rate\n");
1905                 return RS_ACTION_UPSCALE;
1906         }
1907
1908         if ((high_tpt != IWL_INVALID_VALUE) &&
1909             (high_tpt > current_tpt)) {
1910                 IWL_DEBUG_RATE(mvm,
1911                                "Higher rate is better. Increate rate\n");
1912                 return RS_ACTION_UPSCALE;
1913         }
1914
1915         if ((low_tpt != IWL_INVALID_VALUE) &&
1916             (high_tpt != IWL_INVALID_VALUE) &&
1917             (low_tpt < current_tpt) &&
1918             (high_tpt < current_tpt)) {
1919                 IWL_DEBUG_RATE(mvm,
1920                                "Both high and low are worse. Maintain rate\n");
1921                 return RS_ACTION_STAY;
1922         }
1923
1924         if ((low_tpt != IWL_INVALID_VALUE) &&
1925             (low_tpt > current_tpt)) {
1926                 IWL_DEBUG_RATE(mvm,
1927                                "Lower rate is better\n");
1928                 action = RS_ACTION_DOWNSCALE;
1929                 goto out;
1930         }
1931
1932         if ((low_tpt == IWL_INVALID_VALUE) &&
1933             (low != IWL_RATE_INVALID)) {
1934                 IWL_DEBUG_RATE(mvm,
1935                                "No data about lower rate\n");
1936                 action = RS_ACTION_DOWNSCALE;
1937                 goto out;
1938         }
1939
1940         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1941
1942 out:
1943         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1944                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1945                         IWL_DEBUG_RATE(mvm,
1946                                        "SR is above NO DECREASE. Avoid downscale\n");
1947                         action = RS_ACTION_STAY;
1948                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1949                         IWL_DEBUG_RATE(mvm,
1950                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1951                         action = RS_ACTION_STAY;
1952                 } else {
1953                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1954                 }
1955         }
1956
1957         return action;
1958 }
1959
1960 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1961                           struct iwl_lq_sta *lq_sta)
1962 {
1963         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1964          * supports STBC of at least 1*SS
1965          */
1966         if (!lq_sta->stbc_capable)
1967                 return false;
1968
1969         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1970                 return false;
1971
1972         return true;
1973 }
1974
1975 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1976                                 int *weaker, int *stronger)
1977 {
1978         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1979         if (*weaker > TPC_MAX_REDUCTION)
1980                 *weaker = TPC_INVALID;
1981
1982         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1983         if (*stronger < 0)
1984                 *stronger = TPC_INVALID;
1985 }
1986
1987 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1988                            struct rs_rate *rate, enum ieee80211_band band)
1989 {
1990         int index = rate->index;
1991         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1992         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1993                                 !vif->bss_conf.ps);
1994
1995         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1996                        cam, sta_ps_disabled);
1997         /*
1998          * allow tpc only if power management is enabled, or bt coex
1999          * activity grade allows it and we are on 2.4Ghz.
2000          */
2001         if ((cam || sta_ps_disabled) &&
2002             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2003                 return false;
2004
2005         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2006         if (is_legacy(rate))
2007                 return index == IWL_RATE_54M_INDEX;
2008         if (is_ht(rate))
2009                 return index == IWL_RATE_MCS_7_INDEX;
2010         if (is_vht(rate))
2011                 return index == IWL_RATE_MCS_7_INDEX ||
2012                        index == IWL_RATE_MCS_8_INDEX ||
2013                        index == IWL_RATE_MCS_9_INDEX;
2014
2015         WARN_ON_ONCE(1);
2016         return false;
2017 }
2018
2019 enum tpc_action {
2020         TPC_ACTION_STAY,
2021         TPC_ACTION_DECREASE,
2022         TPC_ACTION_INCREASE,
2023         TPC_ACTION_NO_RESTIRCTION,
2024 };
2025
2026 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2027                                          s32 sr, int weak, int strong,
2028                                          int current_tpt,
2029                                          int weak_tpt, int strong_tpt)
2030 {
2031         /* stay until we have valid tpt */
2032         if (current_tpt == IWL_INVALID_VALUE) {
2033                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2034                 return TPC_ACTION_STAY;
2035         }
2036
2037         /* Too many failures, increase txp */
2038         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2039             current_tpt == 0) {
2040                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2041                 return TPC_ACTION_NO_RESTIRCTION;
2042         }
2043
2044         /* try decreasing first if applicable */
2045         if (weak != TPC_INVALID) {
2046                 if (weak_tpt == IWL_INVALID_VALUE &&
2047                     (strong_tpt == IWL_INVALID_VALUE ||
2048                      current_tpt >= strong_tpt)) {
2049                         IWL_DEBUG_RATE(mvm,
2050                                        "no weak txp measurement. decrease txp\n");
2051                         return TPC_ACTION_DECREASE;
2052                 }
2053
2054                 if (weak_tpt > current_tpt) {
2055                         IWL_DEBUG_RATE(mvm,
2056                                        "lower txp has better tpt. decrease txp\n");
2057                         return TPC_ACTION_DECREASE;
2058                 }
2059         }
2060
2061         /* next, increase if needed */
2062         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2063             strong != TPC_INVALID) {
2064                 if (weak_tpt == IWL_INVALID_VALUE &&
2065                     strong_tpt != IWL_INVALID_VALUE &&
2066                     current_tpt < strong_tpt) {
2067                         IWL_DEBUG_RATE(mvm,
2068                                        "higher txp has better tpt. increase txp\n");
2069                         return TPC_ACTION_INCREASE;
2070                 }
2071
2072                 if (weak_tpt < current_tpt &&
2073                     (strong_tpt == IWL_INVALID_VALUE ||
2074                      strong_tpt > current_tpt)) {
2075                         IWL_DEBUG_RATE(mvm,
2076                                        "lower txp has worse tpt. increase txp\n");
2077                         return TPC_ACTION_INCREASE;
2078                 }
2079         }
2080
2081         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2082         return TPC_ACTION_STAY;
2083 }
2084
2085 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2086                            struct ieee80211_sta *sta,
2087                            struct iwl_lq_sta *lq_sta,
2088                            struct iwl_scale_tbl_info *tbl)
2089 {
2090         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2091         struct ieee80211_vif *vif = mvm_sta->vif;
2092         struct ieee80211_chanctx_conf *chanctx_conf;
2093         enum ieee80211_band band;
2094         struct iwl_rate_scale_data *window;
2095         struct rs_rate *rate = &tbl->rate;
2096         enum tpc_action action;
2097         s32 sr;
2098         u8 cur = lq_sta->lq.reduced_tpc;
2099         int current_tpt;
2100         int weak, strong;
2101         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2102
2103 #ifdef CONFIG_MAC80211_DEBUGFS
2104         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2105                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2106                                lq_sta->pers.dbg_fixed_txp_reduction);
2107                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2108                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2109         }
2110 #endif
2111
2112         rcu_read_lock();
2113         chanctx_conf = rcu_dereference(vif->chanctx_conf);
2114         if (WARN_ON(!chanctx_conf))
2115                 band = IEEE80211_NUM_BANDS;
2116         else
2117                 band = chanctx_conf->def.chan->band;
2118         rcu_read_unlock();
2119
2120         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2121                 IWL_DEBUG_RATE(mvm,
2122                                "tpc is not allowed. remove txp restrictions\n");
2123                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2124                 return cur != TPC_NO_REDUCTION;
2125         }
2126
2127         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2128
2129         /* Collect measured throughputs for current and adjacent rates */
2130         window = tbl->tpc_win;
2131         sr = window[cur].success_ratio;
2132         current_tpt = window[cur].average_tpt;
2133         if (weak != TPC_INVALID)
2134                 weak_tpt = window[weak].average_tpt;
2135         if (strong != TPC_INVALID)
2136                 strong_tpt = window[strong].average_tpt;
2137
2138         IWL_DEBUG_RATE(mvm,
2139                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2140                        cur, current_tpt, sr, weak, strong,
2141                        weak_tpt, strong_tpt);
2142
2143         action = rs_get_tpc_action(mvm, sr, weak, strong,
2144                                    current_tpt, weak_tpt, strong_tpt);
2145
2146         /* override actions if we are on the edge */
2147         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2148                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2149                 action = TPC_ACTION_STAY;
2150         } else if (strong == TPC_INVALID &&
2151                    (action == TPC_ACTION_INCREASE ||
2152                     action == TPC_ACTION_NO_RESTIRCTION)) {
2153                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2154                 action = TPC_ACTION_STAY;
2155         }
2156
2157         switch (action) {
2158         case TPC_ACTION_DECREASE:
2159                 lq_sta->lq.reduced_tpc = weak;
2160                 return true;
2161         case TPC_ACTION_INCREASE:
2162                 lq_sta->lq.reduced_tpc = strong;
2163                 return true;
2164         case TPC_ACTION_NO_RESTIRCTION:
2165                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2166                 return true;
2167         case TPC_ACTION_STAY:
2168                 /* do nothing */
2169                 break;
2170         }
2171         return false;
2172 }
2173
2174 /*
2175  * Do rate scaling and search for new modulation mode.
2176  */
2177 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2178                                   struct ieee80211_sta *sta,
2179                                   struct iwl_lq_sta *lq_sta,
2180                                   int tid)
2181 {
2182         int low = IWL_RATE_INVALID;
2183         int high = IWL_RATE_INVALID;
2184         int index;
2185         struct iwl_rate_scale_data *window = NULL;
2186         int current_tpt = IWL_INVALID_VALUE;
2187         int low_tpt = IWL_INVALID_VALUE;
2188         int high_tpt = IWL_INVALID_VALUE;
2189         u32 fail_count;
2190         enum rs_action scale_action = RS_ACTION_STAY;
2191         u16 rate_mask;
2192         u8 update_lq = 0;
2193         struct iwl_scale_tbl_info *tbl, *tbl1;
2194         u8 active_tbl = 0;
2195         u8 done_search = 0;
2196         u16 high_low;
2197         s32 sr;
2198         u8 prev_agg = lq_sta->is_agg;
2199         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2200         struct iwl_mvm_tid_data *tid_data;
2201         struct rs_rate *rate;
2202
2203         lq_sta->is_agg = !!sta_priv->agg_tids;
2204
2205         /*
2206          * Select rate-scale / modulation-mode table to work with in
2207          * the rest of this function:  "search" if searching for better
2208          * modulation mode, or "active" if doing rate scaling within a mode.
2209          */
2210         if (!lq_sta->search_better_tbl)
2211                 active_tbl = lq_sta->active_tbl;
2212         else
2213                 active_tbl = 1 - lq_sta->active_tbl;
2214
2215         tbl = &(lq_sta->lq_info[active_tbl]);
2216         rate = &tbl->rate;
2217
2218         if (prev_agg != lq_sta->is_agg) {
2219                 IWL_DEBUG_RATE(mvm,
2220                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2221                                prev_agg, lq_sta->is_agg);
2222                 rs_set_expected_tpt_table(lq_sta, tbl);
2223                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2224         }
2225
2226         /* current tx rate */
2227         index = rate->index;
2228
2229         /* rates available for this association, and for modulation mode */
2230         rate_mask = rs_get_supported_rates(lq_sta, rate);
2231
2232         if (!(BIT(index) & rate_mask)) {
2233                 IWL_ERR(mvm, "Current Rate is not valid\n");
2234                 if (lq_sta->search_better_tbl) {
2235                         /* revert to active table if search table is not valid*/
2236                         rate->type = LQ_NONE;
2237                         lq_sta->search_better_tbl = 0;
2238                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2239                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2240                 }
2241                 return;
2242         }
2243
2244         /* Get expected throughput table and history window for current rate */
2245         if (!tbl->expected_tpt) {
2246                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2247                 return;
2248         }
2249
2250         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2251         window = &(tbl->win[index]);
2252
2253         /*
2254          * If there is not enough history to calculate actual average
2255          * throughput, keep analyzing results of more tx frames, without
2256          * changing rate or mode (bypass most of the rest of this function).
2257          * Set up new rate table in uCode only if old rate is not supported
2258          * in current association (use new rate found above).
2259          */
2260         fail_count = window->counter - window->success_counter;
2261         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2262             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2263                 IWL_DEBUG_RATE(mvm,
2264                                "%s: Test Window: succ %d total %d\n",
2265                                rs_pretty_rate(rate),
2266                                window->success_counter, window->counter);
2267
2268                 /* Can't calculate this yet; not enough history */
2269                 window->average_tpt = IWL_INVALID_VALUE;
2270
2271                 /* Should we stay with this modulation mode,
2272                  * or search for a new one? */
2273                 rs_stay_in_table(lq_sta, false);
2274
2275                 return;
2276         }
2277
2278         /* If we are searching for better modulation mode, check success. */
2279         if (lq_sta->search_better_tbl) {
2280                 /* If good success, continue using the "search" mode;
2281                  * no need to send new link quality command, since we're
2282                  * continuing to use the setup that we've been trying. */
2283                 if (window->average_tpt > lq_sta->last_tpt) {
2284                         IWL_DEBUG_RATE(mvm,
2285                                        "SWITCHING TO NEW TABLE SR: %d "
2286                                        "cur-tpt %d old-tpt %d\n",
2287                                        window->success_ratio,
2288                                        window->average_tpt,
2289                                        lq_sta->last_tpt);
2290
2291                         /* Swap tables; "search" becomes "active" */
2292                         lq_sta->active_tbl = active_tbl;
2293                         current_tpt = window->average_tpt;
2294                 /* Else poor success; go back to mode in "active" table */
2295                 } else {
2296                         IWL_DEBUG_RATE(mvm,
2297                                        "GOING BACK TO THE OLD TABLE: SR %d "
2298                                        "cur-tpt %d old-tpt %d\n",
2299                                        window->success_ratio,
2300                                        window->average_tpt,
2301                                        lq_sta->last_tpt);
2302
2303                         /* Nullify "search" table */
2304                         rate->type = LQ_NONE;
2305
2306                         /* Revert to "active" table */
2307                         active_tbl = lq_sta->active_tbl;
2308                         tbl = &(lq_sta->lq_info[active_tbl]);
2309
2310                         /* Revert to "active" rate and throughput info */
2311                         index = tbl->rate.index;
2312                         current_tpt = lq_sta->last_tpt;
2313
2314                         /* Need to set up a new rate table in uCode */
2315                         update_lq = 1;
2316                 }
2317
2318                 /* Either way, we've made a decision; modulation mode
2319                  * search is done, allow rate adjustment next time. */
2320                 lq_sta->search_better_tbl = 0;
2321                 done_search = 1;        /* Don't switch modes below! */
2322                 goto lq_update;
2323         }
2324
2325         /* (Else) not in search of better modulation mode, try for better
2326          * starting rate, while staying in this mode. */
2327         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2328         low = high_low & 0xff;
2329         high = (high_low >> 8) & 0xff;
2330
2331         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2332
2333         sr = window->success_ratio;
2334
2335         /* Collect measured throughputs for current and adjacent rates */
2336         current_tpt = window->average_tpt;
2337         if (low != IWL_RATE_INVALID)
2338                 low_tpt = tbl->win[low].average_tpt;
2339         if (high != IWL_RATE_INVALID)
2340                 high_tpt = tbl->win[high].average_tpt;
2341
2342         IWL_DEBUG_RATE(mvm,
2343                        "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2344                        rs_pretty_rate(rate), current_tpt, sr,
2345                        low, high, low_tpt, high_tpt);
2346
2347         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2348                                           current_tpt, low_tpt, high_tpt);
2349
2350         /* Force a search in case BT doesn't like us being in MIMO */
2351         if (is_mimo(rate) &&
2352             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2353                 IWL_DEBUG_RATE(mvm,
2354                                "BT Coex forbids MIMO. Search for new config\n");
2355                 rs_stay_in_table(lq_sta, true);
2356                 goto lq_update;
2357         }
2358
2359         switch (scale_action) {
2360         case RS_ACTION_DOWNSCALE:
2361                 /* Decrease starting rate, update uCode's rate table */
2362                 if (low != IWL_RATE_INVALID) {
2363                         update_lq = 1;
2364                         index = low;
2365                 } else {
2366                         IWL_DEBUG_RATE(mvm,
2367                                        "At the bottom rate. Can't decrease\n");
2368                 }
2369
2370                 break;
2371         case RS_ACTION_UPSCALE:
2372                 /* Increase starting rate, update uCode's rate table */
2373                 if (high != IWL_RATE_INVALID) {
2374                         update_lq = 1;
2375                         index = high;
2376                 } else {
2377                         IWL_DEBUG_RATE(mvm,
2378                                        "At the top rate. Can't increase\n");
2379                 }
2380
2381                 break;
2382         case RS_ACTION_STAY:
2383                 /* No change */
2384                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2385                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2386                 break;
2387         default:
2388                 break;
2389         }
2390
2391 lq_update:
2392         /* Replace uCode's rate table for the destination station. */
2393         if (update_lq) {
2394                 tbl->rate.index = index;
2395                 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2396                         rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2397                 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2398         }
2399
2400         rs_stay_in_table(lq_sta, false);
2401
2402         /*
2403          * Search for new modulation mode if we're:
2404          * 1)  Not changing rates right now
2405          * 2)  Not just finishing up a search
2406          * 3)  Allowing a new search
2407          */
2408         if (!update_lq && !done_search &&
2409             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2410             && window->counter) {
2411                 enum rs_column next_column;
2412
2413                 /* Save current throughput to compare with "search" throughput*/
2414                 lq_sta->last_tpt = current_tpt;
2415
2416                 IWL_DEBUG_RATE(mvm,
2417                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2418                                update_lq, done_search, lq_sta->rs_state,
2419                                window->counter);
2420
2421                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2422                 if (next_column != RS_COLUMN_INVALID) {
2423                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2424                                                       next_column);
2425                         if (!ret)
2426                                 lq_sta->search_better_tbl = 1;
2427                 } else {
2428                         IWL_DEBUG_RATE(mvm,
2429                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2430                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2431                 }
2432
2433                 /* If new "search" mode was selected, set up in uCode table */
2434                 if (lq_sta->search_better_tbl) {
2435                         /* Access the "search" table, clear its history. */
2436                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2437                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2438
2439                         /* Use new "search" start rate */
2440                         index = tbl->rate.index;
2441
2442                         rs_dump_rate(mvm, &tbl->rate,
2443                                      "Switch to SEARCH TABLE:");
2444                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2445                 } else {
2446                         done_search = 1;
2447                 }
2448         }
2449
2450         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2451                 /* If the "active" (non-search) mode was legacy,
2452                  * and we've tried switching antennas,
2453                  * but we haven't been able to try HT modes (not available),
2454                  * stay with best antenna legacy modulation for a while
2455                  * before next round of mode comparisons. */
2456                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2457                 if (is_legacy(&tbl1->rate)) {
2458                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2459
2460                         if (tid != IWL_MAX_TID_COUNT) {
2461                                 tid_data = &sta_priv->tid_data[tid];
2462                                 if (tid_data->state != IWL_AGG_OFF) {
2463                                         IWL_DEBUG_RATE(mvm,
2464                                                        "Stop aggregation on tid %d\n",
2465                                                        tid);
2466                                         ieee80211_stop_tx_ba_session(sta, tid);
2467                                 }
2468                         }
2469                         rs_set_stay_in_table(mvm, 1, lq_sta);
2470                 } else {
2471                 /* If we're in an HT mode, and all 3 mode switch actions
2472                  * have been tried and compared, stay in this best modulation
2473                  * mode for a while before next round of mode comparisons. */
2474                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2475                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2476                             (tid != IWL_MAX_TID_COUNT)) {
2477                                 tid_data = &sta_priv->tid_data[tid];
2478                                 if (tid_data->state == IWL_AGG_OFF) {
2479                                         IWL_DEBUG_RATE(mvm,
2480                                                        "try to aggregate tid %d\n",
2481                                                        tid);
2482                                         rs_tl_turn_on_agg(mvm, tid,
2483                                                           lq_sta, sta);
2484                                 }
2485                         }
2486                         rs_set_stay_in_table(mvm, 0, lq_sta);
2487                 }
2488         }
2489 }
2490
2491 struct rs_init_rate_info {
2492         s8 rssi;
2493         u8 rate_idx;
2494 };
2495
2496 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2497         { -60, IWL_RATE_54M_INDEX },
2498         { -64, IWL_RATE_48M_INDEX },
2499         { -68, IWL_RATE_36M_INDEX },
2500         { -80, IWL_RATE_24M_INDEX },
2501         { -84, IWL_RATE_18M_INDEX },
2502         { -85, IWL_RATE_12M_INDEX },
2503         { -86, IWL_RATE_11M_INDEX },
2504         { -88, IWL_RATE_5M_INDEX  },
2505         { -90, IWL_RATE_2M_INDEX  },
2506         { S8_MIN, IWL_RATE_1M_INDEX },
2507 };
2508
2509 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2510         { -60, IWL_RATE_54M_INDEX },
2511         { -64, IWL_RATE_48M_INDEX },
2512         { -72, IWL_RATE_36M_INDEX },
2513         { -80, IWL_RATE_24M_INDEX },
2514         { -84, IWL_RATE_18M_INDEX },
2515         { -85, IWL_RATE_12M_INDEX },
2516         { -87, IWL_RATE_9M_INDEX  },
2517         { S8_MIN, IWL_RATE_6M_INDEX },
2518 };
2519
2520 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2521         { -60, IWL_RATE_MCS_7_INDEX },
2522         { -64, IWL_RATE_MCS_6_INDEX },
2523         { -68, IWL_RATE_MCS_5_INDEX },
2524         { -72, IWL_RATE_MCS_4_INDEX },
2525         { -80, IWL_RATE_MCS_3_INDEX },
2526         { -84, IWL_RATE_MCS_2_INDEX },
2527         { -85, IWL_RATE_MCS_1_INDEX },
2528         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2529 };
2530
2531 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2532         { -60, IWL_RATE_MCS_8_INDEX },
2533         { -64, IWL_RATE_MCS_7_INDEX },
2534         { -68, IWL_RATE_MCS_6_INDEX },
2535         { -72, IWL_RATE_MCS_5_INDEX },
2536         { -80, IWL_RATE_MCS_4_INDEX },
2537         { -84, IWL_RATE_MCS_3_INDEX },
2538         { -85, IWL_RATE_MCS_2_INDEX },
2539         { -87, IWL_RATE_MCS_1_INDEX },
2540         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2541 };
2542
2543 static const struct rs_init_rate_info rs_optimal_rates_vht_40_80mhz[] = {
2544         { -60, IWL_RATE_MCS_9_INDEX },
2545         { -64, IWL_RATE_MCS_8_INDEX },
2546         { -68, IWL_RATE_MCS_7_INDEX },
2547         { -72, IWL_RATE_MCS_6_INDEX },
2548         { -80, IWL_RATE_MCS_5_INDEX },
2549         { -84, IWL_RATE_MCS_4_INDEX },
2550         { -85, IWL_RATE_MCS_3_INDEX },
2551         { -87, IWL_RATE_MCS_2_INDEX },
2552         { -88, IWL_RATE_MCS_1_INDEX },
2553         { S8_MIN, IWL_RATE_MCS_0_INDEX },
2554 };
2555
2556 /* Init the optimal rate based on STA caps
2557  * This combined with rssi is used to report the last tx rate
2558  * to userspace when we haven't transmitted enough frames.
2559  */
2560 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2561                                  struct ieee80211_sta *sta,
2562                                  struct iwl_lq_sta *lq_sta)
2563 {
2564         struct rs_rate *rate = &lq_sta->optimal_rate;
2565
2566         if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2567                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2568         else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2569                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2570         else if (lq_sta->band == IEEE80211_BAND_5GHZ)
2571                 rate->type = LQ_LEGACY_A;
2572         else
2573                 rate->type = LQ_LEGACY_G;
2574
2575         rate->bw = rs_bw_from_sta_bw(sta);
2576         rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2577
2578         /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2579
2580         if (is_mimo(rate)) {
2581                 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2582         } else if (is_siso(rate)) {
2583                 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2584         } else {
2585                 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2586
2587                 if (lq_sta->band == IEEE80211_BAND_5GHZ) {
2588                         lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2589                         lq_sta->optimal_nentries =
2590                                 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2591                 } else {
2592                         lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2593                         lq_sta->optimal_nentries =
2594                                 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2595                 }
2596         }
2597
2598         if (is_vht(rate)) {
2599                 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2600                         lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2601                         lq_sta->optimal_nentries =
2602                                 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2603                 } else {
2604                         lq_sta->optimal_rates = rs_optimal_rates_vht_40_80mhz;
2605                         lq_sta->optimal_nentries =
2606                                 ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz);
2607                 }
2608         } else if (is_ht(rate)) {
2609                 lq_sta->optimal_rates = rs_optimal_rates_ht;
2610                 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2611         }
2612 }
2613
2614 /* Compute the optimal rate index based on RSSI */
2615 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2616                                            struct iwl_lq_sta *lq_sta)
2617 {
2618         struct rs_rate *rate = &lq_sta->optimal_rate;
2619         int i;
2620
2621         rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2622                                      BITS_PER_LONG);
2623
2624         for (i = 0; i < lq_sta->optimal_nentries; i++) {
2625                 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2626
2627                 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2628                     (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2629                         rate->index = rate_idx;
2630                         break;
2631                 }
2632         }
2633
2634         return rate;
2635 }
2636
2637 /* Choose an initial legacy rate and antenna to use based on the RSSI
2638  * of last Rx
2639  */
2640 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2641                                 struct iwl_lq_sta *lq_sta,
2642                                 enum ieee80211_band band,
2643                                 struct rs_rate *rate)
2644 {
2645         int i, nentries;
2646         s8 best_rssi = S8_MIN;
2647         u8 best_ant = ANT_NONE;
2648         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2649         const struct rs_init_rate_info *initial_rates;
2650
2651         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2652                 if (!(lq_sta->pers.chains & BIT(i)))
2653                         continue;
2654
2655                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2656                         best_rssi = lq_sta->pers.chain_signal[i];
2657                         best_ant = BIT(i);
2658                 }
2659         }
2660
2661         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2662                        rs_pretty_ant(best_ant), best_rssi);
2663
2664         if (best_ant != ANT_A && best_ant != ANT_B)
2665                 rate->ant = first_antenna(valid_tx_ant);
2666         else
2667                 rate->ant = best_ant;
2668
2669         rate->sgi = false;
2670         rate->ldpc = false;
2671         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2672
2673         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2674                                      BITS_PER_LONG);
2675
2676         if (band == IEEE80211_BAND_5GHZ) {
2677                 rate->type = LQ_LEGACY_A;
2678                 initial_rates = rs_optimal_rates_5ghz_legacy;
2679                 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2680         } else {
2681                 rate->type = LQ_LEGACY_G;
2682                 initial_rates = rs_optimal_rates_24ghz_legacy;
2683                 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2684         }
2685
2686         if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2687                 for (i = 0; i < nentries; i++) {
2688                         int rate_idx = initial_rates[i].rate_idx;
2689                         if ((best_rssi >= initial_rates[i].rssi) &&
2690                             (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2691                                 rate->index = rate_idx;
2692                                 break;
2693                         }
2694                 }
2695         }
2696
2697         IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2698                        rs_pretty_ant(rate->ant));
2699 }
2700
2701 /* Save info about RSSI of last Rx */
2702 void rs_update_last_rssi(struct iwl_mvm *mvm,
2703                          struct iwl_lq_sta *lq_sta,
2704                          struct ieee80211_rx_status *rx_status)
2705 {
2706         int i;
2707
2708         lq_sta->pers.chains = rx_status->chains;
2709         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2710         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2711         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2712         lq_sta->pers.last_rssi = S8_MIN;
2713
2714         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2715                 if (!(lq_sta->pers.chains & BIT(i)))
2716                         continue;
2717
2718                 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2719                         lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2720         }
2721 }
2722
2723 /**
2724  * rs_initialize_lq - Initialize a station's hardware rate table
2725  *
2726  * The uCode's station table contains a table of fallback rates
2727  * for automatic fallback during transmission.
2728  *
2729  * NOTE: This sets up a default set of values.  These will be replaced later
2730  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2731  *       rc80211_simple.
2732  *
2733  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2734  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2735  *       which requires station table entry to exist).
2736  */
2737 static void rs_initialize_lq(struct iwl_mvm *mvm,
2738                              struct ieee80211_sta *sta,
2739                              struct iwl_lq_sta *lq_sta,
2740                              enum ieee80211_band band,
2741                              bool init)
2742 {
2743         struct iwl_scale_tbl_info *tbl;
2744         struct rs_rate *rate;
2745         u8 active_tbl = 0;
2746
2747         if (!sta || !lq_sta)
2748                 return;
2749
2750         if (!lq_sta->search_better_tbl)
2751                 active_tbl = lq_sta->active_tbl;
2752         else
2753                 active_tbl = 1 - lq_sta->active_tbl;
2754
2755         tbl = &(lq_sta->lq_info[active_tbl]);
2756         rate = &tbl->rate;
2757
2758         rs_get_initial_rate(mvm, lq_sta, band, rate);
2759         rs_init_optimal_rate(mvm, sta, lq_sta);
2760
2761         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2762         if (rate->ant == ANT_A)
2763                 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2764         else
2765                 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2766
2767         rs_set_expected_tpt_table(lq_sta, tbl);
2768         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2769         /* TODO restore station should remember the lq cmd */
2770         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2771 }
2772
2773 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2774                         struct ieee80211_tx_rate_control *txrc)
2775 {
2776         struct sk_buff *skb = txrc->skb;
2777         struct iwl_op_mode *op_mode __maybe_unused =
2778                         (struct iwl_op_mode *)mvm_r;
2779         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2780         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2781         struct iwl_lq_sta *lq_sta = mvm_sta;
2782         struct rs_rate *optimal_rate;
2783         u32 last_ucode_rate;
2784
2785         if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2786                 /* if vif isn't initialized mvm doesn't know about
2787                  * this station, so don't do anything with the it
2788                  */
2789                 sta = NULL;
2790                 mvm_sta = NULL;
2791         }
2792
2793         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2794
2795         /* Treat uninitialized rate scaling data same as non-existing. */
2796         if (lq_sta && !lq_sta->pers.drv) {
2797                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2798                 mvm_sta = NULL;
2799         }
2800
2801         /* Send management frames and NO_ACK data using lowest rate. */
2802         if (rate_control_send_low(sta, mvm_sta, txrc))
2803                 return;
2804
2805         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2806                                   info->band, &info->control.rates[0]);
2807         info->control.rates[0].count = 1;
2808
2809         /* Report the optimal rate based on rssi and STA caps if we haven't
2810          * converged yet (too little traffic) or exploring other modulations
2811          */
2812         if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2813                 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2814                 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2815                                                           optimal_rate);
2816                 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2817                                           &txrc->reported_rate);
2818         }
2819 }
2820
2821 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2822                           gfp_t gfp)
2823 {
2824         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2825         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2826         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2827         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2828
2829         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2830
2831         lq_sta->pers.drv = mvm;
2832 #ifdef CONFIG_MAC80211_DEBUGFS
2833         lq_sta->pers.dbg_fixed_rate = 0;
2834         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2835         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2836 #endif
2837         lq_sta->pers.chains = 0;
2838         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2839         lq_sta->pers.last_rssi = S8_MIN;
2840
2841         return &sta_priv->lq_sta;
2842 }
2843
2844 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2845                                        int nss)
2846 {
2847         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2848                 (0x3 << (2 * (nss - 1)));
2849         rx_mcs >>= (2 * (nss - 1));
2850
2851         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2852                 return IWL_RATE_MCS_7_INDEX;
2853         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2854                 return IWL_RATE_MCS_8_INDEX;
2855         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2856                 return IWL_RATE_MCS_9_INDEX;
2857
2858         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2859         return -1;
2860 }
2861
2862 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2863                                      struct ieee80211_sta_vht_cap *vht_cap,
2864                                      struct iwl_lq_sta *lq_sta)
2865 {
2866         int i;
2867         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2868
2869         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2870                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2871                         if (i == IWL_RATE_9M_INDEX)
2872                                 continue;
2873
2874                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2875                         if (i == IWL_RATE_MCS_9_INDEX &&
2876                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2877                                 continue;
2878
2879                         lq_sta->active_siso_rate |= BIT(i);
2880                 }
2881         }
2882
2883         if (sta->rx_nss < 2)
2884                 return;
2885
2886         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2887         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2888                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2889                         if (i == IWL_RATE_9M_INDEX)
2890                                 continue;
2891
2892                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2893                         if (i == IWL_RATE_MCS_9_INDEX &&
2894                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2895                                 continue;
2896
2897                         lq_sta->active_mimo2_rate |= BIT(i);
2898                 }
2899         }
2900 }
2901
2902 static void rs_ht_init(struct iwl_mvm *mvm,
2903                        struct ieee80211_sta *sta,
2904                        struct iwl_lq_sta *lq_sta,
2905                        struct ieee80211_sta_ht_cap *ht_cap)
2906 {
2907         /* active_siso_rate mask includes 9 MBits (bit 5),
2908          * and CCK (bits 0-3), supp_rates[] does not;
2909          * shift to convert format, force 9 MBits off.
2910          */
2911         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2912         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2913         lq_sta->active_siso_rate &= ~((u16)0x2);
2914         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2915
2916         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2917         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2918         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2919         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2920
2921         if (mvm->cfg->ht_params->ldpc &&
2922             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2923                 lq_sta->ldpc = true;
2924
2925         if (mvm->cfg->ht_params->stbc &&
2926             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2927             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2928                 lq_sta->stbc_capable = true;
2929
2930         lq_sta->is_vht = false;
2931 }
2932
2933 static void rs_vht_init(struct iwl_mvm *mvm,
2934                         struct ieee80211_sta *sta,
2935                         struct iwl_lq_sta *lq_sta,
2936                         struct ieee80211_sta_vht_cap *vht_cap)
2937 {
2938         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2939
2940         if (mvm->cfg->ht_params->ldpc &&
2941             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2942                 lq_sta->ldpc = true;
2943
2944         if (mvm->cfg->ht_params->stbc &&
2945             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2946             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2947                 lq_sta->stbc_capable = true;
2948
2949         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2950             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2951             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2952                 lq_sta->bfer_capable = true;
2953
2954         lq_sta->is_vht = true;
2955 }
2956
2957 #ifdef CONFIG_IWLWIFI_DEBUGFS
2958 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2959 {
2960         spin_lock_bh(&mvm->drv_stats_lock);
2961         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2962         spin_unlock_bh(&mvm->drv_stats_lock);
2963 }
2964
2965 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2966 {
2967         u8 nss = 0, mcs = 0;
2968
2969         spin_lock(&mvm->drv_stats_lock);
2970
2971         if (agg)
2972                 mvm->drv_rx_stats.agg_frames++;
2973
2974         mvm->drv_rx_stats.success_frames++;
2975
2976         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2977         case RATE_MCS_CHAN_WIDTH_20:
2978                 mvm->drv_rx_stats.bw_20_frames++;
2979                 break;
2980         case RATE_MCS_CHAN_WIDTH_40:
2981                 mvm->drv_rx_stats.bw_40_frames++;
2982                 break;
2983         case RATE_MCS_CHAN_WIDTH_80:
2984                 mvm->drv_rx_stats.bw_80_frames++;
2985                 break;
2986         default:
2987                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2988         }
2989
2990         if (rate & RATE_MCS_HT_MSK) {
2991                 mvm->drv_rx_stats.ht_frames++;
2992                 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2993                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2994         } else if (rate & RATE_MCS_VHT_MSK) {
2995                 mvm->drv_rx_stats.vht_frames++;
2996                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2997                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2998                        RATE_VHT_MCS_NSS_POS) + 1;
2999         } else {
3000                 mvm->drv_rx_stats.legacy_frames++;
3001         }
3002
3003         if (nss == 1)
3004                 mvm->drv_rx_stats.siso_frames++;
3005         else if (nss == 2)
3006                 mvm->drv_rx_stats.mimo2_frames++;
3007
3008         if (rate & RATE_MCS_SGI_MSK)
3009                 mvm->drv_rx_stats.sgi_frames++;
3010         else
3011                 mvm->drv_rx_stats.ngi_frames++;
3012
3013         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3014         mvm->drv_rx_stats.last_frame_idx =
3015                 (mvm->drv_rx_stats.last_frame_idx + 1) %
3016                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3017
3018         spin_unlock(&mvm->drv_stats_lock);
3019 }
3020 #endif
3021
3022 /*
3023  * Called after adding a new station to initialize rate scaling
3024  */
3025 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3026                           enum ieee80211_band band, bool init)
3027 {
3028         int i, j;
3029         struct ieee80211_hw *hw = mvm->hw;
3030         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3031         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3032         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
3033         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
3034         struct ieee80211_supported_band *sband;
3035         unsigned long supp; /* must be unsigned long for for_each_set_bit */
3036
3037         /* clear all non-persistent lq data */
3038         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3039
3040         sband = hw->wiphy->bands[band];
3041
3042         lq_sta->lq.sta_id = sta_priv->sta_id;
3043
3044         for (j = 0; j < LQ_SIZE; j++)
3045                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3046
3047         lq_sta->flush_timer = 0;
3048         lq_sta->last_tx = jiffies;
3049
3050         IWL_DEBUG_RATE(mvm,
3051                        "LQ: *** rate scale station global init for station %d ***\n",
3052                        sta_priv->sta_id);
3053         /* TODO: what is a good starting rate for STA? About middle? Maybe not
3054          * the lowest or the highest rate.. Could consider using RSSI from
3055          * previous packets? Need to have IEEE 802.1X auth succeed immediately
3056          * after assoc.. */
3057
3058         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3059         lq_sta->band = sband->band;
3060         /*
3061          * active legacy rates as per supported rates bitmap
3062          */
3063         supp = sta->supp_rates[sband->band];
3064         lq_sta->active_legacy_rate = 0;
3065         for_each_set_bit(i, &supp, BITS_PER_LONG)
3066                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3067
3068         /* TODO: should probably account for rx_highest for both HT/VHT */
3069         if (!vht_cap || !vht_cap->vht_supported)
3070                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3071         else
3072                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3073
3074         if (IWL_MVM_RS_DISABLE_P2P_MIMO && sta_priv->vif->p2p)
3075                 lq_sta->active_mimo2_rate = 0;
3076
3077         lq_sta->max_legacy_rate_idx =
3078                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3079         lq_sta->max_siso_rate_idx =
3080                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3081         lq_sta->max_mimo2_rate_idx =
3082                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3083
3084         IWL_DEBUG_RATE(mvm,
3085                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3086                        lq_sta->active_legacy_rate,
3087                        lq_sta->active_siso_rate,
3088                        lq_sta->active_mimo2_rate,
3089                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3090                        lq_sta->bfer_capable);
3091         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3092                        lq_sta->max_legacy_rate_idx,
3093                        lq_sta->max_siso_rate_idx,
3094                        lq_sta->max_mimo2_rate_idx);
3095
3096         /* These values will be overridden later */
3097         lq_sta->lq.single_stream_ant_msk =
3098                 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3099         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3100
3101         /* as default allow aggregation for all tids */
3102         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3103         lq_sta->is_agg = 0;
3104 #ifdef CONFIG_IWLWIFI_DEBUGFS
3105         iwl_mvm_reset_frame_stats(mvm);
3106 #endif
3107         rs_initialize_lq(mvm, sta, lq_sta, band, init);
3108 }
3109
3110 static void rs_rate_update(void *mvm_r,
3111                            struct ieee80211_supported_band *sband,
3112                            struct cfg80211_chan_def *chandef,
3113                            struct ieee80211_sta *sta, void *priv_sta,
3114                            u32 changed)
3115 {
3116         u8 tid;
3117         struct iwl_op_mode *op_mode  =
3118                         (struct iwl_op_mode *)mvm_r;
3119         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3120
3121         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3122                 return;
3123
3124         /* Stop any ongoing aggregations as rs starts off assuming no agg */
3125         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3126                 ieee80211_stop_tx_ba_session(sta, tid);
3127
3128         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3129 }
3130
3131 #ifdef CONFIG_MAC80211_DEBUGFS
3132 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3133                                             struct iwl_lq_cmd *lq_cmd,
3134                                             enum ieee80211_band band,
3135                                             u32 ucode_rate)
3136 {
3137         struct rs_rate rate;
3138         int i;
3139         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3140         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3141         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3142
3143         for (i = 0; i < num_rates; i++)
3144                 lq_cmd->rs_table[i] = ucode_rate_le32;
3145
3146         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
3147
3148         if (is_mimo(&rate))
3149                 lq_cmd->mimo_delim = num_rates - 1;
3150         else
3151                 lq_cmd->mimo_delim = 0;
3152
3153         lq_cmd->reduced_tpc = 0;
3154
3155         if (num_of_ant(ant) == 1)
3156                 lq_cmd->single_stream_ant_msk = ant;
3157
3158         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3159 }
3160 #endif /* CONFIG_MAC80211_DEBUGFS */
3161
3162 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3163                                      struct iwl_lq_sta *lq_sta,
3164                                      struct rs_rate *rate,
3165                                      __le32 *rs_table, int *rs_table_index,
3166                                      int num_rates, int num_retries,
3167                                      u8 valid_tx_ant, bool toggle_ant)
3168 {
3169         int i, j;
3170         __le32 ucode_rate;
3171         bool bottom_reached = false;
3172         int prev_rate_idx = rate->index;
3173         int end = LINK_QUAL_MAX_RETRY_NUM;
3174         int index = *rs_table_index;
3175
3176         for (i = 0; i < num_rates && index < end; i++) {
3177                 for (j = 0; j < num_retries && index < end; j++, index++) {
3178                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3179                                                                          rate));
3180                         rs_table[index] = ucode_rate;
3181                         if (toggle_ant)
3182                                 rs_toggle_antenna(valid_tx_ant, rate);
3183                 }
3184
3185                 prev_rate_idx = rate->index;
3186                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3187                 if (bottom_reached && !is_legacy(rate))
3188                         break;
3189         }
3190
3191         if (!bottom_reached && !is_legacy(rate))
3192                 rate->index = prev_rate_idx;
3193
3194         *rs_table_index = index;
3195 }
3196
3197 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3198  * column the rate table should look like this:
3199  *
3200  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3201  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3202  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3203  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3204  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3205  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3206  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3207  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3208  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3209  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3210  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3211  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3212  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3213  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3214  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3215  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3216  */
3217 static void rs_build_rates_table(struct iwl_mvm *mvm,
3218                                  struct ieee80211_sta *sta,
3219                                  struct iwl_lq_sta *lq_sta,
3220                                  const struct rs_rate *initial_rate)
3221 {
3222         struct rs_rate rate;
3223         int num_rates, num_retries, index = 0;
3224         u8 valid_tx_ant = 0;
3225         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3226         bool toggle_ant = false;
3227
3228         memcpy(&rate, initial_rate, sizeof(rate));
3229
3230         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3231
3232         /* TODO: remove old API when min FW API hits 14 */
3233         if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3234             rs_stbc_allow(mvm, sta, lq_sta))
3235                 rate.stbc = true;
3236
3237         if (is_siso(&rate)) {
3238                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3239                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3240         } else if (is_mimo(&rate)) {
3241                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3242                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3243         } else {
3244                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3245                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3246                 toggle_ant = true;
3247         }
3248
3249         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3250                                  num_rates, num_retries, valid_tx_ant,
3251                                  toggle_ant);
3252
3253         rs_get_lower_rate_down_column(lq_sta, &rate);
3254
3255         if (is_siso(&rate)) {
3256                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3257                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3258                 lq_cmd->mimo_delim = index;
3259         } else if (is_legacy(&rate)) {
3260                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3261                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3262         } else {
3263                 WARN_ON_ONCE(1);
3264         }
3265
3266         toggle_ant = true;
3267
3268         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3269                                  num_rates, num_retries, valid_tx_ant,
3270                                  toggle_ant);
3271
3272         rs_get_lower_rate_down_column(lq_sta, &rate);
3273
3274         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3275         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3276
3277         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3278                                  num_rates, num_retries, valid_tx_ant,
3279                                  toggle_ant);
3280
3281 }
3282
3283 struct rs_bfer_active_iter_data {
3284         struct ieee80211_sta *exclude_sta;
3285         struct iwl_mvm_sta *bfer_mvmsta;
3286 };
3287
3288 static void rs_bfer_active_iter(void *_data,
3289                                 struct ieee80211_sta *sta)
3290 {
3291         struct rs_bfer_active_iter_data *data = _data;
3292         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3293         struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3294         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3295
3296         if (sta == data->exclude_sta)
3297                 return;
3298
3299         /* The current sta has BFER allowed */
3300         if (ss_params & LQ_SS_BFER_ALLOWED) {
3301                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3302
3303                 data->bfer_mvmsta = mvmsta;
3304         }
3305 }
3306
3307 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3308 {
3309         int prio = -1;
3310         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3311
3312         switch (viftype) {
3313         case NL80211_IFTYPE_AP:
3314         case NL80211_IFTYPE_P2P_GO:
3315                 prio = 3;
3316                 break;
3317         case NL80211_IFTYPE_P2P_CLIENT:
3318                 prio = 2;
3319                 break;
3320         case NL80211_IFTYPE_STATION:
3321                 prio = 1;
3322                 break;
3323         default:
3324                 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3325                 prio = -1;
3326         }
3327
3328         return prio;
3329 }
3330
3331 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3332 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3333                                 struct iwl_mvm_sta *sta2)
3334 {
3335         int prio1 = rs_bfer_priority(sta1);
3336         int prio2 = rs_bfer_priority(sta2);
3337
3338         if (prio1 > prio2)
3339                 return 1;
3340         if (prio1 < prio2)
3341                 return -1;
3342         return 0;
3343 }
3344
3345 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3346                                 struct ieee80211_sta *sta,
3347                                 struct iwl_lq_sta *lq_sta,
3348                                 const struct rs_rate *initial_rate)
3349 {
3350         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3351         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3352         struct rs_bfer_active_iter_data data = {
3353                 .exclude_sta = sta,
3354                 .bfer_mvmsta = NULL,
3355         };
3356         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3357         u32 ss_params = LQ_SS_PARAMS_VALID;
3358
3359         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3360                 goto out;
3361
3362 #ifdef CONFIG_MAC80211_DEBUGFS
3363         /* Check if forcing the decision is configured.
3364          * Note that SISO is forced by not allowing STBC or BFER
3365          */
3366         if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3367                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3368         else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3369                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3370
3371         if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3372                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3373                                lq_sta->pers.ss_force);
3374                 goto out;
3375         }
3376 #endif
3377
3378         if (lq_sta->stbc_capable)
3379                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3380
3381         if (!lq_sta->bfer_capable)
3382                 goto out;
3383
3384         ieee80211_iterate_stations_atomic(mvm->hw,
3385                                           rs_bfer_active_iter,
3386                                           &data);
3387         bfer_mvmsta = data.bfer_mvmsta;
3388
3389         /* This code is safe as it doesn't run concurrently for different
3390          * stations. This is guaranteed by the fact that calls to
3391          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3392          */
3393         if (!bfer_mvmsta) {
3394                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3395
3396                 ss_params |= LQ_SS_BFER_ALLOWED;
3397                 goto out;
3398         }
3399
3400         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3401                        bfer_mvmsta->sta_id);
3402
3403         /* Disallow BFER on another STA if active and we're a higher priority */
3404         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3405                 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3406                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3407
3408                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3409                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3410                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3411
3412                 ss_params |= LQ_SS_BFER_ALLOWED;
3413                 IWL_DEBUG_RATE(mvm,
3414                                "Lower priority BFER sta found (%d). Switch BFER\n",
3415                                bfer_mvmsta->sta_id);
3416         }
3417 out:
3418         lq_cmd->ss_params = cpu_to_le32(ss_params);
3419 }
3420
3421 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3422                            struct ieee80211_sta *sta,
3423                            struct iwl_lq_sta *lq_sta,
3424                            const struct rs_rate *initial_rate)
3425 {
3426         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3427         struct iwl_mvm_sta *mvmsta;
3428         struct iwl_mvm_vif *mvmvif;
3429
3430         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3431         lq_cmd->agg_time_limit =
3432                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3433
3434 #ifdef CONFIG_MAC80211_DEBUGFS
3435         if (lq_sta->pers.dbg_fixed_rate) {
3436                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3437                                                 lq_sta->band,
3438                                                 lq_sta->pers.dbg_fixed_rate);
3439                 return;
3440         }
3441 #endif
3442         if (WARN_ON_ONCE(!sta || !initial_rate))
3443                 return;
3444
3445         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3446
3447         if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3448                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3449
3450         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3451         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3452
3453         if (num_of_ant(initial_rate->ant) == 1)
3454                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3455
3456         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3457
3458         /*
3459          * In case of low latency, tell the firmware to leave a frame in the
3460          * Tx Fifo so that it can start a transaction in the same TxOP. This
3461          * basically allows the firmware to send bursts.
3462          */
3463         if (iwl_mvm_vif_low_latency(mvmvif)) {
3464                 lq_cmd->agg_frame_cnt_limit--;
3465
3466                 if (mvm->low_latency_agg_frame_limit)
3467                         lq_cmd->agg_frame_cnt_limit =
3468                                 min(lq_cmd->agg_frame_cnt_limit,
3469                                     mvm->low_latency_agg_frame_limit);
3470         }
3471
3472         if (mvmsta->vif->p2p)
3473                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3474
3475         lq_cmd->agg_time_limit =
3476                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3477 }
3478
3479 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3480 {
3481         return hw->priv;
3482 }
3483 /* rate scale requires free function to be implemented */
3484 static void rs_free(void *mvm_rate)
3485 {
3486         return;
3487 }
3488
3489 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3490                         void *mvm_sta)
3491 {
3492         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3493         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3494
3495         IWL_DEBUG_RATE(mvm, "enter\n");
3496         IWL_DEBUG_RATE(mvm, "leave\n");
3497 }
3498
3499 #ifdef CONFIG_MAC80211_DEBUGFS
3500 int rs_pretty_print_rate(char *buf, const u32 rate)
3501 {
3502
3503         char *type, *bw;
3504         u8 mcs = 0, nss = 0;
3505         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3506
3507         if (!(rate & RATE_MCS_HT_MSK) &&
3508             !(rate & RATE_MCS_VHT_MSK)) {
3509                 int index = iwl_hwrate_to_plcp_idx(rate);
3510
3511                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3512                                rs_pretty_ant(ant),
3513                                index == IWL_RATE_INVALID ? "BAD" :
3514                                iwl_rate_mcs[index].mbps);
3515         }
3516
3517         if (rate & RATE_MCS_VHT_MSK) {
3518                 type = "VHT";
3519                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3520                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3521                        >> RATE_VHT_MCS_NSS_POS) + 1;
3522         } else if (rate & RATE_MCS_HT_MSK) {
3523                 type = "HT";
3524                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3525         } else {
3526                 type = "Unknown"; /* shouldn't happen */
3527         }
3528
3529         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3530         case RATE_MCS_CHAN_WIDTH_20:
3531                 bw = "20Mhz";
3532                 break;
3533         case RATE_MCS_CHAN_WIDTH_40:
3534                 bw = "40Mhz";
3535                 break;
3536         case RATE_MCS_CHAN_WIDTH_80:
3537                 bw = "80Mhz";
3538                 break;
3539         case RATE_MCS_CHAN_WIDTH_160:
3540                 bw = "160Mhz";
3541                 break;
3542         default:
3543                 bw = "BAD BW";
3544         }
3545
3546         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3547                        type, rs_pretty_ant(ant), bw, mcs, nss,
3548                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3549                        (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3550                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3551                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3552                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3553 }
3554
3555 /**
3556  * Program the device to use fixed rate for frame transmit
3557  * This is for debugging/testing only
3558  * once the device start use fixed rate, we need to reload the module
3559  * to being back the normal operation.
3560  */
3561 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3562                                 struct iwl_lq_sta *lq_sta)
3563 {
3564         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3565         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3566         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3567
3568         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3569                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3570
3571         if (lq_sta->pers.dbg_fixed_rate) {
3572                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3573                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3574         }
3575 }
3576
3577 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3578                         const char __user *user_buf, size_t count, loff_t *ppos)
3579 {
3580         struct iwl_lq_sta *lq_sta = file->private_data;
3581         struct iwl_mvm *mvm;
3582         char buf[64];
3583         size_t buf_size;
3584         u32 parsed_rate;
3585
3586         mvm = lq_sta->pers.drv;
3587         memset(buf, 0, sizeof(buf));
3588         buf_size = min(count, sizeof(buf) -  1);
3589         if (copy_from_user(buf, user_buf, buf_size))
3590                 return -EFAULT;
3591
3592         if (sscanf(buf, "%x", &parsed_rate) == 1)
3593                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3594         else
3595                 lq_sta->pers.dbg_fixed_rate = 0;
3596
3597         rs_program_fix_rate(mvm, lq_sta);
3598
3599         return count;
3600 }
3601
3602 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3603                         char __user *user_buf, size_t count, loff_t *ppos)
3604 {
3605         char *buff;
3606         int desc = 0;
3607         int i = 0;
3608         ssize_t ret;
3609
3610         struct iwl_lq_sta *lq_sta = file->private_data;
3611         struct iwl_mvm *mvm;
3612         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3613         struct rs_rate *rate = &tbl->rate;
3614         u32 ss_params;
3615         mvm = lq_sta->pers.drv;
3616         buff = kmalloc(2048, GFP_KERNEL);
3617         if (!buff)
3618                 return -ENOMEM;
3619
3620         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3621         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3622                         lq_sta->total_failed, lq_sta->total_success,
3623                         lq_sta->active_legacy_rate);
3624         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3625                         lq_sta->pers.dbg_fixed_rate);
3626         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3627             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3628             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3629             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3630         desc += sprintf(buff+desc, "lq type %s\n",
3631                         (is_legacy(rate)) ? "legacy" :
3632                         is_vht(rate) ? "VHT" : "HT");
3633         if (!is_legacy(rate)) {
3634                 desc += sprintf(buff + desc, " %s",
3635                    (is_siso(rate)) ? "SISO" : "MIMO2");
3636                 desc += sprintf(buff + desc, " %s",
3637                                 (is_ht20(rate)) ? "20MHz" :
3638                                 (is_ht40(rate)) ? "40MHz" :
3639                                 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3640                 desc += sprintf(buff + desc, " %s %s %s\n",
3641                                 (rate->sgi) ? "SGI" : "NGI",
3642                                 (rate->ldpc) ? "LDPC" : "BCC",
3643                                 (lq_sta->is_agg) ? "AGG on" : "");
3644         }
3645         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3646                         lq_sta->last_rate_n_flags);
3647         desc += sprintf(buff+desc,
3648                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3649                         lq_sta->lq.flags,
3650                         lq_sta->lq.mimo_delim,
3651                         lq_sta->lq.single_stream_ant_msk,
3652                         lq_sta->lq.dual_stream_ant_msk);
3653
3654         desc += sprintf(buff+desc,
3655                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3656                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3657                         lq_sta->lq.agg_disable_start_th,
3658                         lq_sta->lq.agg_frame_cnt_limit);
3659
3660         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3661         ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3662         desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3663                         (ss_params & LQ_SS_PARAMS_VALID) ?
3664                         "VALID" : "INVALID",
3665                         (ss_params & LQ_SS_BFER_ALLOWED) ?
3666                         ", BFER" : "",
3667                         (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3668                         ", STBC" : "",
3669                         (ss_params & LQ_SS_FORCE) ?
3670                         ", FORCE" : "");
3671         desc += sprintf(buff+desc,
3672                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3673                         lq_sta->lq.initial_rate_index[0],
3674                         lq_sta->lq.initial_rate_index[1],
3675                         lq_sta->lq.initial_rate_index[2],
3676                         lq_sta->lq.initial_rate_index[3]);
3677
3678         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3679                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3680
3681                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3682                 desc += rs_pretty_print_rate(buff+desc, r);
3683         }
3684
3685         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3686         kfree(buff);
3687         return ret;
3688 }
3689
3690 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3691         .write = rs_sta_dbgfs_scale_table_write,
3692         .read = rs_sta_dbgfs_scale_table_read,
3693         .open = simple_open,
3694         .llseek = default_llseek,
3695 };
3696 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3697                         char __user *user_buf, size_t count, loff_t *ppos)
3698 {
3699         char *buff;
3700         int desc = 0;
3701         int i, j;
3702         ssize_t ret;
3703         struct iwl_scale_tbl_info *tbl;
3704         struct rs_rate *rate;
3705         struct iwl_lq_sta *lq_sta = file->private_data;
3706
3707         buff = kmalloc(1024, GFP_KERNEL);
3708         if (!buff)
3709                 return -ENOMEM;
3710
3711         for (i = 0; i < LQ_SIZE; i++) {
3712                 tbl = &(lq_sta->lq_info[i]);
3713                 rate = &tbl->rate;
3714                 desc += sprintf(buff+desc,
3715                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3716                                 "index=%d\n",
3717                                 lq_sta->active_tbl == i ? "*" : "x",
3718                                 rate->type,
3719                                 rate->sgi,
3720                                 is_ht20(rate) ? "20Mhz" :
3721                                 is_ht40(rate) ? "40Mhz" :
3722                                 is_ht80(rate) ? "80Mhz" : "ERR",
3723                                 rate->index);
3724                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3725                         desc += sprintf(buff+desc,
3726                                 "counter=%d success=%d %%=%d\n",
3727                                 tbl->win[j].counter,
3728                                 tbl->win[j].success_counter,
3729                                 tbl->win[j].success_ratio);
3730                 }
3731         }
3732         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3733         kfree(buff);
3734         return ret;
3735 }
3736
3737 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3738         .read = rs_sta_dbgfs_stats_table_read,
3739         .open = simple_open,
3740         .llseek = default_llseek,
3741 };
3742
3743 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3744                                               char __user *user_buf,
3745                                               size_t count, loff_t *ppos)
3746 {
3747         static const char * const column_name[] = {
3748                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3749                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3750                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3751                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3752                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3753                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3754                 [RS_COLUMN_MIMO2] = "MIMO2",
3755                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3756         };
3757
3758         static const char * const rate_name[] = {
3759                 [IWL_RATE_1M_INDEX] = "1M",
3760                 [IWL_RATE_2M_INDEX] = "2M",
3761                 [IWL_RATE_5M_INDEX] = "5.5M",
3762                 [IWL_RATE_11M_INDEX] = "11M",
3763                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3764                 [IWL_RATE_9M_INDEX] = "9M",
3765                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3766                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3767                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3768                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3769                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3770                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3771                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3772                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3773                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3774         };
3775
3776         char *buff, *pos, *endpos;
3777         int col, rate;
3778         ssize_t ret;
3779         struct iwl_lq_sta *lq_sta = file->private_data;
3780         struct rs_rate_stats *stats;
3781         static const size_t bufsz = 1024;
3782
3783         buff = kmalloc(bufsz, GFP_KERNEL);
3784         if (!buff)
3785                 return -ENOMEM;
3786
3787         pos = buff;
3788         endpos = pos + bufsz;
3789
3790         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3791         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3792                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3793         pos += scnprintf(pos, endpos - pos, "\n");
3794
3795         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3796                 pos += scnprintf(pos, endpos - pos,
3797                                  "%s,", column_name[col]);
3798
3799                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3800                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3801                         pos += scnprintf(pos, endpos - pos,
3802                                          "%llu/%llu,",
3803                                          stats->success,
3804                                          stats->total);
3805                 }
3806                 pos += scnprintf(pos, endpos - pos, "\n");
3807         }
3808
3809         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3810         kfree(buff);
3811         return ret;
3812 }
3813
3814 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3815                                                const char __user *user_buf,
3816                                                size_t count, loff_t *ppos)
3817 {
3818         struct iwl_lq_sta *lq_sta = file->private_data;
3819         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3820
3821         return count;
3822 }
3823
3824 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3825         .read = rs_sta_dbgfs_drv_tx_stats_read,
3826         .write = rs_sta_dbgfs_drv_tx_stats_write,
3827         .open = simple_open,
3828         .llseek = default_llseek,
3829 };
3830
3831 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3832                                        char __user *user_buf,
3833                                        size_t count, loff_t *ppos)
3834 {
3835         struct iwl_lq_sta *lq_sta = file->private_data;
3836         char buf[12];
3837         int bufsz = sizeof(buf);
3838         int pos = 0;
3839         static const char * const ss_force_name[] = {
3840                 [RS_SS_FORCE_NONE] = "none",
3841                 [RS_SS_FORCE_STBC] = "stbc",
3842                 [RS_SS_FORCE_BFER] = "bfer",
3843                 [RS_SS_FORCE_SISO] = "siso",
3844         };
3845
3846         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3847                          ss_force_name[lq_sta->pers.ss_force]);
3848         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3849 }
3850
3851 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3852                                         size_t count, loff_t *ppos)
3853 {
3854         struct iwl_mvm *mvm = lq_sta->pers.drv;
3855         int ret = 0;
3856
3857         if (!strncmp("none", buf, 4)) {
3858                 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3859         } else if (!strncmp("siso", buf, 4)) {
3860                 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3861         } else if (!strncmp("stbc", buf, 4)) {
3862                 if (lq_sta->stbc_capable) {
3863                         lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3864                 } else {
3865                         IWL_ERR(mvm,
3866                                 "can't force STBC. peer doesn't support\n");
3867                         ret = -EINVAL;
3868                 }
3869         } else if (!strncmp("bfer", buf, 4)) {
3870                 if (lq_sta->bfer_capable) {
3871                         lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3872                 } else {
3873                         IWL_ERR(mvm,
3874                                 "can't force BFER. peer doesn't support\n");
3875                         ret = -EINVAL;
3876                 }
3877         } else {
3878                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3879                 ret = -EINVAL;
3880         }
3881         return ret ?: count;
3882 }
3883
3884 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3885         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3886 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
3887                 if (!debugfs_create_file(#name, mode, parent, lq_sta,   \
3888                                          &iwl_dbgfs_##name##_ops))      \
3889                         goto err;                                       \
3890         } while (0)
3891
3892 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3893
3894 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
3895 {
3896         struct iwl_lq_sta *lq_sta = priv_sta;
3897         struct iwl_mvm_sta *mvmsta;
3898
3899         mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3900
3901         if (!mvmsta->vif)
3902                 return;
3903
3904         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3905                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
3906         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3907                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
3908         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3909                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3910         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3911                           &lq_sta->tx_agg_tid_en);
3912         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3913                           &lq_sta->pers.dbg_fixed_txp_reduction);
3914
3915         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3916         return;
3917 err:
3918         IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3919 }
3920
3921 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3922 {
3923 }
3924 #endif
3925
3926 /*
3927  * Initialization of rate scaling information is done by driver after
3928  * the station is added. Since mac80211 calls this function before a
3929  * station is added we ignore it.
3930  */
3931 static void rs_rate_init_stub(void *mvm_r,
3932                               struct ieee80211_supported_band *sband,
3933                               struct cfg80211_chan_def *chandef,
3934                               struct ieee80211_sta *sta, void *mvm_sta)
3935 {
3936 }
3937
3938 static const struct rate_control_ops rs_mvm_ops = {
3939         .name = RS_NAME,
3940         .tx_status = rs_mac80211_tx_status,
3941         .get_rate = rs_get_rate,
3942         .rate_init = rs_rate_init_stub,
3943         .alloc = rs_alloc,
3944         .free = rs_free,
3945         .alloc_sta = rs_alloc_sta,
3946         .free_sta = rs_free_sta,
3947         .rate_update = rs_rate_update,
3948 #ifdef CONFIG_MAC80211_DEBUGFS
3949         .add_sta_debugfs = rs_add_debugfs,
3950         .remove_sta_debugfs = rs_remove_debugfs,
3951 #endif
3952 };
3953
3954 int iwl_mvm_rate_control_register(void)
3955 {
3956         return ieee80211_rate_control_register(&rs_mvm_ops);
3957 }
3958
3959 void iwl_mvm_rate_control_unregister(void)
3960 {
3961         ieee80211_rate_control_unregister(&rs_mvm_ops);
3962 }
3963
3964 /**
3965  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3966  * Tx protection, according to this request and previous requests,
3967  * and send the LQ command.
3968  * @mvmsta: The station
3969  * @enable: Enable Tx protection?
3970  */
3971 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3972                           bool enable)
3973 {
3974         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3975
3976         lockdep_assert_held(&mvm->mutex);
3977
3978         if (enable) {
3979                 if (mvmsta->tx_protection == 0)
3980                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
3981                 mvmsta->tx_protection++;
3982         } else {
3983                 mvmsta->tx_protection--;
3984                 if (mvmsta->tx_protection == 0)
3985                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3986         }
3987
3988         return iwl_mvm_send_lq_cmd(mvm, lq, false);
3989 }