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