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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
   4  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of version 2 of the GNU General Public License as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  18  *
  19  * The full GNU General Public License is included in this distribution in the
  20  * file called LICENSE.
  21  *
  22  * Contact Information:
  23  *  Intel Linux Wireless <ilw@linux.intel.com>
  24  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  25  *
  26  *****************************************************************************/
  27 #include <linux/kernel.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/slab.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37 #include "rs.h"
  38 #include "fw-api.h"
  39 #include "sta.h"
  40 #include "iwl-op-mode.h"
  41 #include "mvm.h"
  42 #include "debugfs.h"
  43
  44 #define RS_NAME "iwl-mvm-rs"
  45
  46 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  47
  48 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
  49  * Use this macro when dealing with thresholds consts set as a percentage
  50  */
  51 #define RS_PERCENT(x) (128 * x)
  52
  53 static u8 rs_ht_to_legacy[] = {
  54         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  55         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  56         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  57         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  58         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  59         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  60         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  61         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  62         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  63         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  64 };
  65
  66 static const u8 ant_toggle_lookup[] = {
  67         [ANT_NONE] = ANT_NONE,
  68         [ANT_A] = ANT_B,
  69         [ANT_B] = ANT_C,
  70         [ANT_AB] = ANT_BC,
  71         [ANT_C] = ANT_A,
  72         [ANT_AC] = ANT_AB,
  73         [ANT_BC] = ANT_AC,
  74         [ANT_ABC] = ANT_ABC,
  75 };
  76
  77 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  78         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  79                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  80                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  81                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  82                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  83                                     IWL_RATE_##rp##M_INDEX,           \
  84                                     IWL_RATE_##rn##M_INDEX }
  85
  86 #define IWL_DECLARE_MCS_RATE(s)                                           \
  87         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
  88                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
  89                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
  90                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
  91                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
  92                                        IWL_RATE_INVM_INDEX,               \
  93                                        IWL_RATE_INVM_INDEX }
  94
  95 /*
  96  * Parameter order:
  97  *   rate, ht rate, prev rate, next rate
  98  *
  99  * If there isn't a valid next or previous rate then INV is used which
 100  * maps to IWL_RATE_INVALID
 101  *
 102  */
 103 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 104         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 105         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 106         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 107         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 108         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 109         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 110         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 111         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 112         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 113         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 114         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 115         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 116         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 117         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 118         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 119 };
 120
 121 enum rs_action {
 122         RS_ACTION_STAY = 0,
 123         RS_ACTION_DOWNSCALE = -1,
 124         RS_ACTION_UPSCALE = 1,
 125 };
 126
 127 enum rs_column_mode {
 128         RS_INVALID = 0,
 129         RS_LEGACY,
 130         RS_SISO,
 131         RS_MIMO2,
 132 };
 133
 134 #define MAX_NEXT_COLUMNS 7
 135 #define MAX_COLUMN_CHECKS 3
 136
 137 struct rs_tx_column;
 138
 139 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 140                                      struct ieee80211_sta *sta,
 141                                      struct iwl_scale_tbl_info *tbl,
 142                                      const struct rs_tx_column *next_col);
 143
 144 struct rs_tx_column {
 145         enum rs_column_mode mode;
 146         u8 ant;
 147         bool sgi;
 148         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 149         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 150 };
 151
 152 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 153                          struct iwl_scale_tbl_info *tbl,
 154                          const struct rs_tx_column *next_col)
 155 {
 156         return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
 157 }
 158
 159 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 160                           struct iwl_scale_tbl_info *tbl,
 161                           const struct rs_tx_column *next_col)
 162 {
 163         struct iwl_mvm_sta *mvmsta;
 164         struct iwl_mvm_vif *mvmvif;
 165
 166         if (!sta->ht_cap.ht_supported)
 167                 return false;
 168
 169         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 170                 return false;
 171
 172         if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
 173                 return false;
 174
 175         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 176                 return false;
 177
 178         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 179         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 180         if (iwl_mvm_vif_low_latency(mvmvif) && mvmsta->vif->p2p)
 181                 return false;
 182
 183         return true;
 184 }
 185
 186 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 187                           struct iwl_scale_tbl_info *tbl,
 188                           const struct rs_tx_column *next_col)
 189 {
 190         if (!sta->ht_cap.ht_supported)
 191                 return false;
 192
 193         return true;
 194 }
 195
 196 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 197                          struct iwl_scale_tbl_info *tbl,
 198                          const struct rs_tx_column *next_col)
 199 {
 200         struct rs_rate *rate = &tbl->rate;
 201         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 202         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 203
 204         if (is_ht20(rate) && (ht_cap->cap &
 205                              IEEE80211_HT_CAP_SGI_20))
 206                 return true;
 207         if (is_ht40(rate) && (ht_cap->cap &
 208                              IEEE80211_HT_CAP_SGI_40))
 209                 return true;
 210         if (is_ht80(rate) && (vht_cap->cap &
 211                              IEEE80211_VHT_CAP_SHORT_GI_80))
 212                 return true;
 213
 214         return false;
 215 }
 216
 217 static const struct rs_tx_column rs_tx_columns[] = {
 218         [RS_COLUMN_LEGACY_ANT_A] = {
 219                 .mode = RS_LEGACY,
 220                 .ant = ANT_A,
 221                 .next_columns = {
 222                         RS_COLUMN_LEGACY_ANT_B,
 223                         RS_COLUMN_SISO_ANT_A,
 224                         RS_COLUMN_MIMO2,
 225                         RS_COLUMN_INVALID,
 226                         RS_COLUMN_INVALID,
 227                         RS_COLUMN_INVALID,
 228                         RS_COLUMN_INVALID,
 229                 },
 230                 .checks = {
 231                         rs_ant_allow,
 232                 },
 233         },
 234         [RS_COLUMN_LEGACY_ANT_B] = {
 235                 .mode = RS_LEGACY,
 236                 .ant = ANT_B,
 237                 .next_columns = {
 238                         RS_COLUMN_LEGACY_ANT_A,
 239                         RS_COLUMN_SISO_ANT_B,
 240                         RS_COLUMN_MIMO2,
 241                         RS_COLUMN_INVALID,
 242                         RS_COLUMN_INVALID,
 243                         RS_COLUMN_INVALID,
 244                         RS_COLUMN_INVALID,
 245                 },
 246                 .checks = {
 247                         rs_ant_allow,
 248                 },
 249         },
 250         [RS_COLUMN_SISO_ANT_A] = {
 251                 .mode = RS_SISO,
 252                 .ant = ANT_A,
 253                 .next_columns = {
 254                         RS_COLUMN_SISO_ANT_B,
 255                         RS_COLUMN_MIMO2,
 256                         RS_COLUMN_SISO_ANT_A_SGI,
 257                         RS_COLUMN_LEGACY_ANT_A,
 258                         RS_COLUMN_LEGACY_ANT_B,
 259                         RS_COLUMN_INVALID,
 260                         RS_COLUMN_INVALID,
 261                 },
 262                 .checks = {
 263                         rs_siso_allow,
 264                         rs_ant_allow,
 265                 },
 266         },
 267         [RS_COLUMN_SISO_ANT_B] = {
 268                 .mode = RS_SISO,
 269                 .ant = ANT_B,
 270                 .next_columns = {
 271                         RS_COLUMN_SISO_ANT_A,
 272                         RS_COLUMN_MIMO2,
 273                         RS_COLUMN_SISO_ANT_B_SGI,
 274                         RS_COLUMN_LEGACY_ANT_A,
 275                         RS_COLUMN_LEGACY_ANT_B,
 276                         RS_COLUMN_INVALID,
 277                         RS_COLUMN_INVALID,
 278                 },
 279                 .checks = {
 280                         rs_siso_allow,
 281                         rs_ant_allow,
 282                 },
 283         },
 284         [RS_COLUMN_SISO_ANT_A_SGI] = {
 285                 .mode = RS_SISO,
 286                 .ant = ANT_A,
 287                 .sgi = true,
 288                 .next_columns = {
 289                         RS_COLUMN_SISO_ANT_B_SGI,
 290                         RS_COLUMN_MIMO2_SGI,
 291                         RS_COLUMN_SISO_ANT_A,
 292                         RS_COLUMN_LEGACY_ANT_A,
 293                         RS_COLUMN_LEGACY_ANT_B,
 294                         RS_COLUMN_INVALID,
 295                         RS_COLUMN_INVALID,
 296                 },
 297                 .checks = {
 298                         rs_siso_allow,
 299                         rs_ant_allow,
 300                         rs_sgi_allow,
 301                 },
 302         },
 303         [RS_COLUMN_SISO_ANT_B_SGI] = {
 304                 .mode = RS_SISO,
 305                 .ant = ANT_B,
 306                 .sgi = true,
 307                 .next_columns = {
 308                         RS_COLUMN_SISO_ANT_A_SGI,
 309                         RS_COLUMN_MIMO2_SGI,
 310                         RS_COLUMN_SISO_ANT_B,
 311                         RS_COLUMN_LEGACY_ANT_A,
 312                         RS_COLUMN_LEGACY_ANT_B,
 313                         RS_COLUMN_INVALID,
 314                         RS_COLUMN_INVALID,
 315                 },
 316                 .checks = {
 317                         rs_siso_allow,
 318                         rs_ant_allow,
 319                         rs_sgi_allow,
 320                 },
 321         },
 322         [RS_COLUMN_MIMO2] = {
 323                 .mode = RS_MIMO2,
 324                 .ant = ANT_AB,
 325                 .next_columns = {
 326                         RS_COLUMN_SISO_ANT_A,
 327                         RS_COLUMN_MIMO2_SGI,
 328                         RS_COLUMN_LEGACY_ANT_A,
 329                         RS_COLUMN_LEGACY_ANT_B,
 330                         RS_COLUMN_INVALID,
 331                         RS_COLUMN_INVALID,
 332                         RS_COLUMN_INVALID,
 333                 },
 334                 .checks = {
 335                         rs_mimo_allow,
 336                 },
 337         },
 338         [RS_COLUMN_MIMO2_SGI] = {
 339                 .mode = RS_MIMO2,
 340                 .ant = ANT_AB,
 341                 .sgi = true,
 342                 .next_columns = {
 343                         RS_COLUMN_SISO_ANT_A_SGI,
 344                         RS_COLUMN_MIMO2,
 345                         RS_COLUMN_LEGACY_ANT_A,
 346                         RS_COLUMN_LEGACY_ANT_B,
 347                         RS_COLUMN_INVALID,
 348                         RS_COLUMN_INVALID,
 349                         RS_COLUMN_INVALID,
 350                 },
 351                 .checks = {
 352                         rs_mimo_allow,
 353                         rs_sgi_allow,
 354                 },
 355         },
 356 };
 357
 358 static inline u8 rs_extract_rate(u32 rate_n_flags)
 359 {
 360         /* also works for HT because bits 7:6 are zero there */
 361         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 362 }
 363
 364 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 365 {
 366         int idx = 0;
 367
 368         if (rate_n_flags & RATE_MCS_HT_MSK) {
 369                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 370                 idx += IWL_RATE_MCS_0_INDEX;
 371
 372                 /* skip 9M not supported in HT*/
 373                 if (idx >= IWL_RATE_9M_INDEX)
 374                         idx += 1;
 375                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 376                         return idx;
 377         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 378                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 379                 idx += IWL_RATE_MCS_0_INDEX;
 380
 381                 /* skip 9M not supported in VHT*/
 382                 if (idx >= IWL_RATE_9M_INDEX)
 383                         idx++;
 384                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 385                         return idx;
 386         } else {
 387                 /* legacy rate format, search for match in table */
 388
 389                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 390                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 391                         if (iwl_rates[idx].plcp == legacy_rate)
 392                                 return idx;
 393         }
 394
 395         return IWL_RATE_INVALID;
 396 }
 397
 398 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 399                                   struct ieee80211_sta *sta,
 400                                   struct iwl_lq_sta *lq_sta,
 401                                   int tid);
 402 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 403                            struct ieee80211_sta *sta,
 404                            struct iwl_lq_sta *lq_sta,
 405                            const struct rs_rate *initial_rate);
 406 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 407
 408 /**
 409  * The following tables contain the expected throughput metrics for all rates
 410  *
 411  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 412  *
 413  * where invalid entries are zeros.
 414  *
 415  * CCK rates are only valid in legacy table and will only be used in G
 416  * (2.4 GHz) band.
 417  */
 418
 419 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 420         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 421 };
 422
 423 /* Expected TpT tables. 4 indexes:
 424  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 425  */
 426 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 427         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 428         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 429         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 430         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 431 };
 432
 433 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 434         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 435         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 436         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 437         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 438 };
 439
 440 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 441         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 442         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 443         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 444         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 445 };
 446
 447 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 448         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 449         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 450         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 451         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 452 };
 453
 454 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 455         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 456         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 457         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 458         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 459 };
 460
 461 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 462         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 463         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 464         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 465         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 466 };
 467
 468 /* mbps, mcs */
 469 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 470         {  "1", "BPSK DSSS"},
 471         {  "2", "QPSK DSSS"},
 472         {"5.5", "BPSK CCK"},
 473         { "11", "QPSK CCK"},
 474         {  "6", "BPSK 1/2"},
 475         {  "9", "BPSK 1/2"},
 476         { "12", "QPSK 1/2"},
 477         { "18", "QPSK 3/4"},
 478         { "24", "16QAM 1/2"},
 479         { "36", "16QAM 3/4"},
 480         { "48", "64QAM 2/3"},
 481         { "54", "64QAM 3/4"},
 482         { "60", "64QAM 5/6"},
 483 };
 484
 485 #define MCS_INDEX_PER_STREAM    (8)
 486
 487 static const char *rs_pretty_ant(u8 ant)
 488 {
 489         static const char * const ant_name[] = {
 490                 [ANT_NONE] = "None",
 491                 [ANT_A]    = "A",
 492                 [ANT_B]    = "B",
 493                 [ANT_AB]   = "AB",
 494                 [ANT_C]    = "C",
 495                 [ANT_AC]   = "AC",
 496                 [ANT_BC]   = "BC",
 497                 [ANT_ABC]  = "ABC",
 498         };
 499
 500         if (ant > ANT_ABC)
 501                 return "UNKNOWN";
 502
 503         return ant_name[ant];
 504 }
 505
 506 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 507 {
 508         static const char * const lq_types[] = {
 509                 [LQ_NONE] = "NONE",
 510                 [LQ_LEGACY_A] = "LEGACY_A",
 511                 [LQ_LEGACY_G] = "LEGACY_G",
 512                 [LQ_HT_SISO] = "HT SISO",
 513                 [LQ_HT_MIMO2] = "HT MIMO",
 514                 [LQ_VHT_SISO] = "VHT SISO",
 515                 [LQ_VHT_MIMO2] = "VHT MIMO",
 516         };
 517
 518         if (type < LQ_NONE || type >= LQ_MAX)
 519                 return "UNKNOWN";
 520
 521         return lq_types[type];
 522 }
 523
 524 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 525                                 const char *prefix)
 526 {
 527         IWL_DEBUG_RATE(mvm,
 528                        "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
 529                        prefix, rs_pretty_lq_type(rate->type),
 530                        rate->index, rs_pretty_ant(rate->ant),
 531                        rate->bw, rate->sgi, rate->ldpc, rate->stbc);
 532 }
 533
 534 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 535 {
 536         window->data = 0;
 537         window->success_counter = 0;
 538         window->success_ratio = IWL_INVALID_VALUE;
 539         window->counter = 0;
 540         window->average_tpt = IWL_INVALID_VALUE;
 541 }
 542
 543 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 544                                             struct iwl_scale_tbl_info *tbl)
 545 {
 546         int i;
 547
 548         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 549         for (i = 0; i < IWL_RATE_COUNT; i++)
 550                 rs_rate_scale_clear_window(&tbl->win[i]);
 551
 552         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 553                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 554 }
 555
 556 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 557 {
 558         return (ant_type & valid_antenna) == ant_type;
 559 }
 560
 561 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 562                                       struct iwl_lq_sta *lq_data, u8 tid,
 563                                       struct ieee80211_sta *sta)
 564 {
 565         int ret = -EAGAIN;
 566
 567         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 568                      sta->addr, tid);
 569         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 570         if (ret == -EAGAIN) {
 571                 /*
 572                  * driver and mac80211 is out of sync
 573                  * this might be cause by reloading firmware
 574                  * stop the tx ba session here
 575                  */
 576                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 577                         tid);
 578                 ieee80211_stop_tx_ba_session(sta, tid);
 579         }
 580         return ret;
 581 }
 582
 583 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 584                               struct iwl_lq_sta *lq_data,
 585                               struct ieee80211_sta *sta)
 586 {
 587         if (tid < IWL_MAX_TID_COUNT)
 588                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 589         else
 590                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 591                         tid, IWL_MAX_TID_COUNT);
 592 }
 593
 594 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 595 {
 596         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 597                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 598                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 599 }
 600
 601 /*
 602  * Static function to get the expected throughput from an iwl_scale_tbl_info
 603  * that wraps a NULL pointer check
 604  */
 605 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 606 {
 607         if (tbl->expected_tpt)
 608                 return tbl->expected_tpt[rs_index];
 609         return 0;
 610 }
 611
 612 /**
 613  * rs_collect_tx_data - Update the success/failure sliding window
 614  *
 615  * We keep a sliding window of the last 62 packets transmitted
 616  * at this rate.  window->data contains the bitmask of successful
 617  * packets.
 618  */
 619 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
 620                                struct iwl_scale_tbl_info *tbl,
 621                                int scale_index, int attempts, int successes,
 622                                struct iwl_rate_scale_data *window)
 623 {
 624         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 625         s32 fail_count, tpt;
 626
 627         /* Get expected throughput */
 628         tpt = get_expected_tpt(tbl, scale_index);
 629
 630         /*
 631          * Keep track of only the latest 62 tx frame attempts in this rate's
 632          * history window; anything older isn't really relevant any more.
 633          * If we have filled up the sliding window, drop the oldest attempt;
 634          * if the oldest attempt (highest bit in bitmap) shows "success",
 635          * subtract "1" from the success counter (this is the main reason
 636          * we keep these bitmaps!).
 637          */
 638         while (attempts > 0) {
 639                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 640                         /* remove earliest */
 641                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 642
 643                         if (window->data & mask) {
 644                                 window->data &= ~mask;
 645                                 window->success_counter--;
 646                         }
 647                 }
 648
 649                 /* Increment frames-attempted counter */
 650                 window->counter++;
 651
 652                 /* Shift bitmap by one frame to throw away oldest history */
 653                 window->data <<= 1;
 654
 655                 /* Mark the most recent #successes attempts as successful */
 656                 if (successes > 0) {
 657                         window->success_counter++;
 658                         window->data |= 0x1;
 659                         successes--;
 660                 }
 661
 662                 attempts--;
 663         }
 664
 665         /* Calculate current success ratio, avoid divide-by-0! */
 666         if (window->counter > 0)
 667                 window->success_ratio = 128 * (100 * window->success_counter)
 668                                         / window->counter;
 669         else
 670                 window->success_ratio = IWL_INVALID_VALUE;
 671
 672         fail_count = window->counter - window->success_counter;
 673
 674         /* Calculate average throughput, if we have enough history. */
 675         if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
 676             (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
 677                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 678         else
 679                 window->average_tpt = IWL_INVALID_VALUE;
 680
 681         return 0;
 682 }
 683
 684 static int rs_collect_tx_data(struct iwl_mvm *mvm,
 685                               struct iwl_lq_sta *lq_sta,
 686                               struct iwl_scale_tbl_info *tbl,
 687                               int scale_index, int attempts, int successes,
 688                               u8 reduced_txp)
 689 {
 690         struct iwl_rate_scale_data *window = NULL;
 691         int ret;
 692
 693         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 694                 return -EINVAL;
 695
 696         if (tbl->column != RS_COLUMN_INVALID) {
 697                 struct lq_sta_pers *pers = &lq_sta->pers;
 698
 699                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 700                 pers->tx_stats[tbl->column][scale_index].success += successes;
 701         }
 702
 703         /* Select window for current tx bit rate */
 704         window = &(tbl->win[scale_index]);
 705
 706         ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 707                                   window);
 708         if (ret)
 709                 return ret;
 710
 711         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 712                 return -EINVAL;
 713
 714         window = &tbl->tpc_win[reduced_txp];
 715         return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 716                                    window);
 717 }
 718
 719 /* Convert rs_rate object into ucode rate bitmask */
 720 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 721                                   struct rs_rate *rate)
 722 {
 723         u32 ucode_rate = 0;
 724         int index = rate->index;
 725
 726         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 727                          RATE_MCS_ANT_ABC_MSK);
 728
 729         if (is_legacy(rate)) {
 730                 ucode_rate |= iwl_rates[index].plcp;
 731                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 732                         ucode_rate |= RATE_MCS_CCK_MSK;
 733                 return ucode_rate;
 734         }
 735
 736         if (is_ht(rate)) {
 737                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 738                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 739                         index = IWL_LAST_HT_RATE;
 740                 }
 741                 ucode_rate |= RATE_MCS_HT_MSK;
 742
 743                 if (is_ht_siso(rate))
 744                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 745                 else if (is_ht_mimo2(rate))
 746                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 747                 else
 748                         WARN_ON_ONCE(1);
 749         } else if (is_vht(rate)) {
 750                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 751                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 752                         index = IWL_LAST_VHT_RATE;
 753                 }
 754                 ucode_rate |= RATE_MCS_VHT_MSK;
 755                 if (is_vht_siso(rate))
 756                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 757                 else if (is_vht_mimo2(rate))
 758                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 759                 else
 760                         WARN_ON_ONCE(1);
 761
 762         } else {
 763                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 764         }
 765
 766         if (is_siso(rate) && rate->stbc) {
 767                 /* To enable STBC we need to set both a flag and ANT_AB */
 768                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 769                 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
 770         }
 771
 772         ucode_rate |= rate->bw;
 773         if (rate->sgi)
 774                 ucode_rate |= RATE_MCS_SGI_MSK;
 775         if (rate->ldpc)
 776                 ucode_rate |= RATE_MCS_LDPC_MSK;
 777
 778         return ucode_rate;
 779 }
 780
 781 /* Convert a ucode rate into an rs_rate object */
 782 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 783                                    enum ieee80211_band band,
 784                                    struct rs_rate *rate)
 785 {
 786         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 787         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 788         u8 nss;
 789
 790         memset(rate, 0, sizeof(*rate));
 791         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 792
 793         if (rate->index == IWL_RATE_INVALID)
 794                 return -EINVAL;
 795
 796         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 797
 798         /* Legacy */
 799         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 800             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 801                 if (num_of_ant == 1) {
 802                         if (band == IEEE80211_BAND_5GHZ)
 803                                 rate->type = LQ_LEGACY_A;
 804                         else
 805                                 rate->type = LQ_LEGACY_G;
 806                 }
 807
 808                 return 0;
 809         }
 810
 811         /* HT or VHT */
 812         if (ucode_rate & RATE_MCS_SGI_MSK)
 813                 rate->sgi = true;
 814         if (ucode_rate & RATE_MCS_LDPC_MSK)
 815                 rate->ldpc = true;
 816         if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
 817                 rate->stbc = true;
 818         if (ucode_rate & RATE_MCS_BF_MSK)
 819                 rate->bfer = true;
 820
 821         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 822
 823         if (ucode_rate & RATE_MCS_HT_MSK) {
 824                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 825                        RATE_HT_MCS_NSS_POS) + 1;
 826
 827                 if (nss == 1) {
 828                         rate->type = LQ_HT_SISO;
 829                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 830                                   "stbc %d bfer %d",
 831                                   rate->stbc, rate->bfer);
 832                 } else if (nss == 2) {
 833                         rate->type = LQ_HT_MIMO2;
 834                         WARN_ON_ONCE(num_of_ant != 2);
 835                 } else {
 836                         WARN_ON_ONCE(1);
 837                 }
 838         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 839                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 840                        RATE_VHT_MCS_NSS_POS) + 1;
 841
 842                 if (nss == 1) {
 843                         rate->type = LQ_VHT_SISO;
 844                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 845                                   "stbc %d bfer %d",
 846                                   rate->stbc, rate->bfer);
 847                 } else if (nss == 2) {
 848                         rate->type = LQ_VHT_MIMO2;
 849                         WARN_ON_ONCE(num_of_ant != 2);
 850                 } else {
 851                         WARN_ON_ONCE(1);
 852                 }
 853         }
 854
 855         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
 856         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 857                      !is_vht(rate));
 858
 859         return 0;
 860 }
 861
 862 /* switch to another antenna/antennas and return 1 */
 863 /* if no other valid antenna found, return 0 */
 864 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 865 {
 866         u8 new_ant_type;
 867
 868         if (!rate->ant || rate->ant > ANT_ABC)
 869                 return 0;
 870
 871         if (!rs_is_valid_ant(valid_ant, rate->ant))
 872                 return 0;
 873
 874         new_ant_type = ant_toggle_lookup[rate->ant];
 875
 876         while ((new_ant_type != rate->ant) &&
 877                !rs_is_valid_ant(valid_ant, new_ant_type))
 878                 new_ant_type = ant_toggle_lookup[new_ant_type];
 879
 880         if (new_ant_type == rate->ant)
 881                 return 0;
 882
 883         rate->ant = new_ant_type;
 884
 885         return 1;
 886 }
 887
 888 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 889                                   struct rs_rate *rate)
 890 {
 891         if (is_legacy(rate))
 892                 return lq_sta->active_legacy_rate;
 893         else if (is_siso(rate))
 894                 return lq_sta->active_siso_rate;
 895         else if (is_mimo2(rate))
 896                 return lq_sta->active_mimo2_rate;
 897
 898         WARN_ON_ONCE(1);
 899         return 0;
 900 }
 901
 902 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 903                                 int rate_type)
 904 {
 905         u8 high = IWL_RATE_INVALID;
 906         u8 low = IWL_RATE_INVALID;
 907
 908         /* 802.11A or ht walks to the next literal adjacent rate in
 909          * the rate table */
 910         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 911                 int i;
 912                 u32 mask;
 913
 914                 /* Find the previous rate that is in the rate mask */
 915                 i = index - 1;
 916                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 917                         if (rate_mask & mask) {
 918                                 low = i;
 919                                 break;
 920                         }
 921                 }
 922
 923                 /* Find the next rate that is in the rate mask */
 924                 i = index + 1;
 925                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 926                         if (rate_mask & mask) {
 927                                 high = i;
 928                                 break;
 929                         }
 930                 }
 931
 932                 return (high << 8) | low;
 933         }
 934
 935         low = index;
 936         while (low != IWL_RATE_INVALID) {
 937                 low = iwl_rates[low].prev_rs;
 938                 if (low == IWL_RATE_INVALID)
 939                         break;
 940                 if (rate_mask & (1 << low))
 941                         break;
 942         }
 943
 944         high = index;
 945         while (high != IWL_RATE_INVALID) {
 946                 high = iwl_rates[high].next_rs;
 947                 if (high == IWL_RATE_INVALID)
 948                         break;
 949                 if (rate_mask & (1 << high))
 950                         break;
 951         }
 952
 953         return (high << 8) | low;
 954 }
 955
 956 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
 957                                      struct rs_rate *rate)
 958 {
 959         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
 960 }
 961
 962 /* Get the next supported lower rate in the current column.
 963  * Return true if bottom rate in the current column was reached
 964  */
 965 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
 966                                         struct rs_rate *rate)
 967 {
 968         u8 low;
 969         u16 high_low;
 970         u16 rate_mask;
 971         struct iwl_mvm *mvm = lq_sta->pers.drv;
 972
 973         rate_mask = rs_get_supported_rates(lq_sta, rate);
 974         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
 975                                         rate->type);
 976         low = high_low & 0xff;
 977
 978         /* Bottom rate of column reached */
 979         if (low == IWL_RATE_INVALID)
 980                 return true;
 981
 982         rate->index = low;
 983         return false;
 984 }
 985
 986 /* Get the next rate to use following a column downgrade */
 987 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
 988                                           struct rs_rate *rate)
 989 {
 990         struct iwl_mvm *mvm = lq_sta->pers.drv;
 991
 992         if (is_legacy(rate)) {
 993                 /* No column to downgrade from Legacy */
 994                 return;
 995         } else if (is_siso(rate)) {
 996                 /* Downgrade to Legacy if we were in SISO */
 997                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 998                         rate->type = LQ_LEGACY_A;
 999                 else
1000                         rate->type = LQ_LEGACY_G;
1001
1002                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1003
1004                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1005                              rate->index > IWL_RATE_MCS_9_INDEX);
1006
1007                 rate->index = rs_ht_to_legacy[rate->index];
1008                 rate->ldpc = false;
1009         } else {
1010                 /* Downgrade to SISO with same MCS if in MIMO  */
1011                 rate->type = is_vht_mimo2(rate) ?
1012                         LQ_VHT_SISO : LQ_HT_SISO;
1013         }
1014
1015         if (num_of_ant(rate->ant) > 1)
1016                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1017
1018         /* Relevant in both switching to SISO or Legacy */
1019         rate->sgi = false;
1020
1021         if (!rs_rate_supported(lq_sta, rate))
1022                 rs_get_lower_rate_in_column(lq_sta, rate);
1023 }
1024
1025 /* Check if both rates are identical
1026  * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1027  * with a rate indicating STBC/BFER and ANT_AB.
1028  */
1029 static inline bool rs_rate_equal(struct rs_rate *a,
1030                                  struct rs_rate *b,
1031                                  bool allow_ant_mismatch)
1032
1033 {
1034         bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1035                 (a->bfer == b->bfer);
1036
1037         if (allow_ant_mismatch) {
1038                 if (a->stbc || a->bfer) {
1039                         WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1040                                   a->stbc, a->bfer, a->ant);
1041                         ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1042                 } else if (b->stbc || b->bfer) {
1043                         WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1044                                   b->stbc, b->bfer, b->ant);
1045                         ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1046                 }
1047         }
1048
1049         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1050                 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1051 }
1052
1053 /* Check if both rates share the same column */
1054 static inline bool rs_rate_column_match(struct rs_rate *a,
1055                                         struct rs_rate *b)
1056 {
1057         bool ant_match;
1058
1059         if (a->stbc || a->bfer)
1060                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1061         else
1062                 ant_match = (a->ant == b->ant);
1063
1064         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1065                 && ant_match;
1066 }
1067
1068 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1069 {
1070         u8 tid = IWL_MAX_TID_COUNT;
1071
1072         if (ieee80211_is_data_qos(hdr->frame_control)) {
1073                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1074                 tid = qc[0] & 0xf;
1075         }
1076
1077         if (unlikely(tid > IWL_MAX_TID_COUNT))
1078                 tid = IWL_MAX_TID_COUNT;
1079
1080         return tid;
1081 }
1082
1083 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1084                           int tid, struct ieee80211_tx_info *info)
1085 {
1086         int legacy_success;
1087         int retries;
1088         int i;
1089         struct iwl_lq_cmd *table;
1090         u32 lq_hwrate;
1091         struct rs_rate lq_rate, tx_resp_rate;
1092         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1093         u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1094         u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1095         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1096         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1097         bool allow_ant_mismatch = mvm->fw->ucode_capa.api[0] &
1098                 IWL_UCODE_TLV_API_LQ_SS_PARAMS;
1099
1100         /* Treat uninitialized rate scaling data same as non-existing. */
1101         if (!lq_sta) {
1102                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1103                 return;
1104         } else if (!lq_sta->pers.drv) {
1105                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1106                 return;
1107         }
1108
1109 #ifdef CONFIG_MAC80211_DEBUGFS
1110         /* Disable last tx check if we are debugging with fixed rate */
1111         if (lq_sta->pers.dbg_fixed_rate) {
1112                 IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n");
1113                 return;
1114         }
1115 #endif
1116         /* This packet was aggregated but doesn't carry status info */
1117         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1118             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1119                 return;
1120
1121         if (time_after(jiffies,
1122                        (unsigned long)(lq_sta->last_tx +
1123                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1124                 int t;
1125
1126                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1127                 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1128                         ieee80211_stop_tx_ba_session(sta, t);
1129
1130                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1131                 return;
1132         }
1133         lq_sta->last_tx = jiffies;
1134
1135         /* Ignore this Tx frame response if its initial rate doesn't match
1136          * that of latest Link Quality command.  There may be stragglers
1137          * from a previous Link Quality command, but we're no longer interested
1138          * in those; they're either from the "active" mode while we're trying
1139          * to check "search" mode, or a prior "search" mode after we've moved
1140          * to a new "search" mode (which might become the new "active" mode).
1141          */
1142         table = &lq_sta->lq;
1143         lq_hwrate = le32_to_cpu(table->rs_table[0]);
1144         rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1145         rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1146
1147         /* Here we actually compare this rate to the latest LQ command */
1148         if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1149                 IWL_DEBUG_RATE(mvm,
1150                                "initial tx resp rate 0x%x does not match 0x%x\n",
1151                                tx_resp_hwrate, lq_hwrate);
1152
1153                 /*
1154                  * Since rates mis-match, the last LQ command may have failed.
1155                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1156                  * ... driver.
1157                  */
1158                 lq_sta->missed_rate_counter++;
1159                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1160                         lq_sta->missed_rate_counter = 0;
1161                         IWL_DEBUG_RATE(mvm,
1162                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1163                                        lq_sta->rs_state);
1164                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1165                 }
1166                 /* Regardless, ignore this status info for outdated rate */
1167                 return;
1168         } else
1169                 /* Rate did match, so reset the missed_rate_counter */
1170                 lq_sta->missed_rate_counter = 0;
1171
1172         if (!lq_sta->search_better_tbl) {
1173                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1174                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1175         } else {
1176                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1177                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1178         }
1179
1180         if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1181                 IWL_DEBUG_RATE(mvm,
1182                                "Neither active nor search matches tx rate\n");
1183                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1184                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1185                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1186                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1187                 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1188
1189                 /*
1190                  * no matching table found, let's by-pass the data collection
1191                  * and continue to perform rate scale to find the rate table
1192                  */
1193                 rs_stay_in_table(lq_sta, true);
1194                 goto done;
1195         }
1196
1197         /*
1198          * Updating the frame history depends on whether packets were
1199          * aggregated.
1200          *
1201          * For aggregation, all packets were transmitted at the same rate, the
1202          * first index into rate scale table.
1203          */
1204         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1205                 /* ampdu_ack_len = 0 marks no BA was received. In this case
1206                  * treat it as a single frame loss as we don't want the success
1207                  * ratio to dip too quickly because a BA wasn't received
1208                  */
1209                 if (info->status.ampdu_ack_len == 0)
1210                         info->status.ampdu_len = 1;
1211
1212                 rs_collect_tx_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1213                                    info->status.ampdu_len,
1214                                    info->status.ampdu_ack_len,
1215                                    reduced_txp);
1216
1217                 /* Update success/fail counts if not searching for new mode */
1218                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1219                         lq_sta->total_success += info->status.ampdu_ack_len;
1220                         lq_sta->total_failed += (info->status.ampdu_len -
1221                                         info->status.ampdu_ack_len);
1222                 }
1223         } else {
1224         /*
1225          * For legacy, update frame history with for each Tx retry.
1226          */
1227                 retries = info->status.rates[0].count - 1;
1228                 /* HW doesn't send more than 15 retries */
1229                 retries = min(retries, 15);
1230
1231                 /* The last transmission may have been successful */
1232                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1233                 /* Collect data for each rate used during failed TX attempts */
1234                 for (i = 0; i <= retries; ++i) {
1235                         lq_hwrate = le32_to_cpu(table->rs_table[i]);
1236                         rs_rate_from_ucode_rate(lq_hwrate, info->band,
1237                                                 &lq_rate);
1238                         /*
1239                          * Only collect stats if retried rate is in the same RS
1240                          * table as active/search.
1241                          */
1242                         if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1243                                 tmp_tbl = curr_tbl;
1244                         else if (rs_rate_column_match(&lq_rate,
1245                                                       &other_tbl->rate))
1246                                 tmp_tbl = other_tbl;
1247                         else
1248                                 continue;
1249
1250                         rs_collect_tx_data(mvm, lq_sta, tmp_tbl, lq_rate.index,
1251                                            1, i < retries ? 0 : legacy_success,
1252                                            reduced_txp);
1253                 }
1254
1255                 /* Update success/fail counts if not searching for new mode */
1256                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1257                         lq_sta->total_success += legacy_success;
1258                         lq_sta->total_failed += retries + (1 - legacy_success);
1259                 }
1260         }
1261         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1262         lq_sta->last_rate_n_flags = lq_hwrate;
1263         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1264 done:
1265         /* See if there's a better rate or modulation mode to try. */
1266         if (sta->supp_rates[info->band])
1267                 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1268 }
1269
1270 /*
1271  * mac80211 sends us Tx status
1272  */
1273 static void rs_mac80211_tx_status(void *mvm_r,
1274                                   struct ieee80211_supported_band *sband,
1275                                   struct ieee80211_sta *sta, void *priv_sta,
1276                                   struct sk_buff *skb)
1277 {
1278         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1279         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1280         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1281         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1282
1283         if (!ieee80211_is_data(hdr->frame_control) ||
1284             info->flags & IEEE80211_TX_CTL_NO_ACK)
1285                 return;
1286
1287         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1288 }
1289
1290 /*
1291  * Begin a period of staying with a selected modulation mode.
1292  * Set "stay_in_tbl" flag to prevent any mode switches.
1293  * Set frame tx success limits according to legacy vs. high-throughput,
1294  * and reset overall (spanning all rates) tx success history statistics.
1295  * These control how long we stay using same modulation mode before
1296  * searching for a new mode.
1297  */
1298 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1299                                  struct iwl_lq_sta *lq_sta)
1300 {
1301         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1302         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1303         if (is_legacy) {
1304                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1305                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1306                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1307         } else {
1308                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1309                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1310                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1311         }
1312         lq_sta->table_count = 0;
1313         lq_sta->total_failed = 0;
1314         lq_sta->total_success = 0;
1315         lq_sta->flush_timer = jiffies;
1316         lq_sta->visited_columns = 0;
1317 }
1318
1319 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1320 {
1321         if (rate_mask)
1322                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1323         return IWL_RATE_INVALID;
1324 }
1325
1326 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1327                                    const struct rs_tx_column *column)
1328 {
1329         switch (column->mode) {
1330         case RS_LEGACY:
1331                 return lq_sta->max_legacy_rate_idx;
1332         case RS_SISO:
1333                 return lq_sta->max_siso_rate_idx;
1334         case RS_MIMO2:
1335                 return lq_sta->max_mimo2_rate_idx;
1336         default:
1337                 WARN_ON_ONCE(1);
1338         }
1339
1340         return lq_sta->max_legacy_rate_idx;
1341 }
1342
1343 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1344                                             const struct rs_tx_column *column,
1345                                             u32 bw)
1346 {
1347         /* Used to choose among HT tables */
1348         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1349
1350         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1351                          column->mode != RS_SISO &&
1352                          column->mode != RS_MIMO2))
1353                 return expected_tpt_legacy;
1354
1355         /* Legacy rates have only one table */
1356         if (column->mode == RS_LEGACY)
1357                 return expected_tpt_legacy;
1358
1359         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1360         /* Choose among many HT tables depending on number of streams
1361          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1362          * status */
1363         if (column->mode == RS_SISO) {
1364                 switch (bw) {
1365                 case RATE_MCS_CHAN_WIDTH_20:
1366                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1367                         break;
1368                 case RATE_MCS_CHAN_WIDTH_40:
1369                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1370                         break;
1371                 case RATE_MCS_CHAN_WIDTH_80:
1372                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1373                         break;
1374                 default:
1375                         WARN_ON_ONCE(1);
1376                 }
1377         } else if (column->mode == RS_MIMO2) {
1378                 switch (bw) {
1379                 case RATE_MCS_CHAN_WIDTH_20:
1380                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1381                         break;
1382                 case RATE_MCS_CHAN_WIDTH_40:
1383                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1384                         break;
1385                 case RATE_MCS_CHAN_WIDTH_80:
1386                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1387                         break;
1388                 default:
1389                         WARN_ON_ONCE(1);
1390                 }
1391         } else {
1392                 WARN_ON_ONCE(1);
1393         }
1394
1395         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1396                 return ht_tbl_pointer[0];
1397         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1398                 return ht_tbl_pointer[1];
1399         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1400                 return ht_tbl_pointer[2];
1401         else                                            /* AGG+SGI */
1402                 return ht_tbl_pointer[3];
1403 }
1404
1405 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1406                                       struct iwl_scale_tbl_info *tbl)
1407 {
1408         struct rs_rate *rate = &tbl->rate;
1409         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1410
1411         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1412 }
1413
1414 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1415                             struct iwl_lq_sta *lq_sta,
1416                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1417                             unsigned long rate_mask, s8 index)
1418 {
1419         struct iwl_scale_tbl_info *active_tbl =
1420             &(lq_sta->lq_info[lq_sta->active_tbl]);
1421         s32 success_ratio = active_tbl->win[index].success_ratio;
1422         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1423         const u16 *tpt_tbl = tbl->expected_tpt;
1424         u16 high_low;
1425         u32 target_tpt;
1426         int rate_idx;
1427
1428         if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) {
1429                 target_tpt = 100 * expected_current_tpt;
1430                 IWL_DEBUG_RATE(mvm,
1431                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1432                                success_ratio, target_tpt);
1433         } else {
1434                 target_tpt = lq_sta->last_tpt;
1435                 IWL_DEBUG_RATE(mvm,
1436                                "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1437                                success_ratio, target_tpt);
1438         }
1439
1440         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1441
1442         while (rate_idx != IWL_RATE_INVALID) {
1443                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1444                         break;
1445
1446                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1447                                                 tbl->rate.type);
1448
1449                 rate_idx = (high_low >> 8) & 0xff;
1450         }
1451
1452         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1453                        rate_idx, target_tpt,
1454                        rate_idx != IWL_RATE_INVALID ?
1455                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1456
1457         return rate_idx;
1458 }
1459
1460 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1461 {
1462         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1463                 return RATE_MCS_CHAN_WIDTH_80;
1464         else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1465                 return RATE_MCS_CHAN_WIDTH_40;
1466
1467         return RATE_MCS_CHAN_WIDTH_20;
1468 }
1469
1470 /*
1471  * Check whether we should continue using same modulation mode, or
1472  * begin search for a new mode, based on:
1473  * 1) # tx successes or failures while using this mode
1474  * 2) # times calling this function
1475  * 3) elapsed time in this mode (not used, for now)
1476  */
1477 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1478 {
1479         struct iwl_scale_tbl_info *tbl;
1480         int active_tbl;
1481         int flush_interval_passed = 0;
1482         struct iwl_mvm *mvm;
1483
1484         mvm = lq_sta->pers.drv;
1485         active_tbl = lq_sta->active_tbl;
1486
1487         tbl = &(lq_sta->lq_info[active_tbl]);
1488
1489         /* If we've been disallowing search, see if we should now allow it */
1490         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1491                 /* Elapsed time using current modulation mode */
1492                 if (lq_sta->flush_timer)
1493                         flush_interval_passed =
1494                                 time_after(jiffies,
1495                                            (unsigned long)(lq_sta->flush_timer +
1496                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1497
1498                 /*
1499                  * Check if we should allow search for new modulation mode.
1500                  * If many frames have failed or succeeded, or we've used
1501                  * this same modulation for a long time, allow search, and
1502                  * reset history stats that keep track of whether we should
1503                  * allow a new search.  Also (below) reset all bitmaps and
1504                  * stats in active history.
1505                  */
1506                 if (force_search ||
1507                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1508                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1509                     ((!lq_sta->search_better_tbl) &&
1510                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1511                         IWL_DEBUG_RATE(mvm,
1512                                        "LQ: stay is expired %d %d %d\n",
1513                                      lq_sta->total_failed,
1514                                      lq_sta->total_success,
1515                                      flush_interval_passed);
1516
1517                         /* Allow search for new mode */
1518                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1519                         IWL_DEBUG_RATE(mvm,
1520                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1521                         lq_sta->total_failed = 0;
1522                         lq_sta->total_success = 0;
1523                         lq_sta->flush_timer = 0;
1524                         /* mark the current column as visited */
1525                         lq_sta->visited_columns = BIT(tbl->column);
1526                 /*
1527                  * Else if we've used this modulation mode enough repetitions
1528                  * (regardless of elapsed time or success/failure), reset
1529                  * history bitmaps and rate-specific stats for all rates in
1530                  * active table.
1531                  */
1532                 } else {
1533                         lq_sta->table_count++;
1534                         if (lq_sta->table_count >=
1535                             lq_sta->table_count_limit) {
1536                                 lq_sta->table_count = 0;
1537
1538                                 IWL_DEBUG_RATE(mvm,
1539                                                "LQ: stay in table clear win\n");
1540                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1541                         }
1542                 }
1543
1544                 /* If transitioning to allow "search", reset all history
1545                  * bitmaps and stats in active table (this will become the new
1546                  * "search" table). */
1547                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1548                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1549                 }
1550         }
1551 }
1552
1553 /*
1554  * setup rate table in uCode
1555  */
1556 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1557                                struct ieee80211_sta *sta,
1558                                struct iwl_lq_sta *lq_sta,
1559                                struct rs_rate *rate)
1560 {
1561         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
1562         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1563 }
1564
1565 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1566                                          struct iwl_lq_sta *lq_sta,
1567                                          struct ieee80211_sta *sta,
1568                                          struct iwl_scale_tbl_info *tbl)
1569 {
1570         int i, j, max_rate;
1571         enum rs_column next_col_id;
1572         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1573         const struct rs_tx_column *next_col;
1574         allow_column_func_t allow_func;
1575         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1576         const u16 *expected_tpt_tbl;
1577         u16 tpt, max_expected_tpt;
1578
1579         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1580                 next_col_id = curr_col->next_columns[i];
1581
1582                 if (next_col_id == RS_COLUMN_INVALID)
1583                         continue;
1584
1585                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1586                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1587                                        next_col_id);
1588                         continue;
1589                 }
1590
1591                 next_col = &rs_tx_columns[next_col_id];
1592
1593                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1594                         IWL_DEBUG_RATE(mvm,
1595                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1596                                        next_col_id, valid_ants, next_col->ant);
1597                         continue;
1598                 }
1599
1600                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1601                         allow_func = next_col->checks[j];
1602                         if (allow_func && !allow_func(mvm, sta, tbl, next_col))
1603                                 break;
1604                 }
1605
1606                 if (j != MAX_COLUMN_CHECKS) {
1607                         IWL_DEBUG_RATE(mvm,
1608                                        "Skip column %d: not allowed (check %d failed)\n",
1609                                        next_col_id, j);
1610
1611                         continue;
1612                 }
1613
1614                 tpt = lq_sta->last_tpt / 100;
1615                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1616                                                      rs_bw_from_sta_bw(sta));
1617                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1618                         continue;
1619
1620                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1621                 if (max_rate == IWL_RATE_INVALID) {
1622                         IWL_DEBUG_RATE(mvm,
1623                                        "Skip column %d: no rate is allowed in this column\n",
1624                                        next_col_id);
1625                         continue;
1626                 }
1627
1628                 max_expected_tpt = expected_tpt_tbl[max_rate];
1629                 if (tpt >= max_expected_tpt) {
1630                         IWL_DEBUG_RATE(mvm,
1631                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1632                                        next_col_id, max_expected_tpt, tpt);
1633                         continue;
1634                 }
1635
1636                 IWL_DEBUG_RATE(mvm,
1637                                "Found potential column %d. Max expected %d current %d\n",
1638                                next_col_id, max_expected_tpt, tpt);
1639                 break;
1640         }
1641
1642         if (i == MAX_NEXT_COLUMNS)
1643                 return RS_COLUMN_INVALID;
1644
1645         return next_col_id;
1646 }
1647
1648 static int rs_switch_to_column(struct iwl_mvm *mvm,
1649                                struct iwl_lq_sta *lq_sta,
1650                                struct ieee80211_sta *sta,
1651                                enum rs_column col_id)
1652 {
1653         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1654         struct iwl_scale_tbl_info *search_tbl =
1655                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1656         struct rs_rate *rate = &search_tbl->rate;
1657         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1658         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1659         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1660                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1661         unsigned long rate_mask = 0;
1662         u32 rate_idx = 0;
1663
1664         memcpy(search_tbl, tbl, sz);
1665
1666         rate->sgi = column->sgi;
1667         rate->ant = column->ant;
1668
1669         if (column->mode == RS_LEGACY) {
1670                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1671                         rate->type = LQ_LEGACY_A;
1672                 else
1673                         rate->type = LQ_LEGACY_G;
1674
1675                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1676                 rate->ldpc = false;
1677                 rate_mask = lq_sta->active_legacy_rate;
1678         } else if (column->mode == RS_SISO) {
1679                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1680                 rate_mask = lq_sta->active_siso_rate;
1681         } else if (column->mode == RS_MIMO2) {
1682                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1683                 rate_mask = lq_sta->active_mimo2_rate;
1684         } else {
1685                 WARN_ON_ONCE("Bad column mode");
1686         }
1687
1688         if (column->mode != RS_LEGACY) {
1689                 rate->bw = rs_bw_from_sta_bw(sta);
1690                 rate->ldpc = lq_sta->ldpc;
1691         }
1692
1693         search_tbl->column = col_id;
1694         rs_set_expected_tpt_table(lq_sta, search_tbl);
1695
1696         lq_sta->visited_columns |= BIT(col_id);
1697
1698         /* Get the best matching rate if we're changing modes. e.g.
1699          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1700          */
1701         if (curr_column->mode != column->mode) {
1702                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1703                                             rate_mask, rate->index);
1704
1705                 if ((rate_idx == IWL_RATE_INVALID) ||
1706                     !(BIT(rate_idx) & rate_mask)) {
1707                         IWL_DEBUG_RATE(mvm,
1708                                        "can not switch with index %d"
1709                                        " rate mask %lx\n",
1710                                        rate_idx, rate_mask);
1711
1712                         goto err;
1713                 }
1714
1715                 rate->index = rate_idx;
1716         }
1717
1718         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1719                        col_id, rate->index);
1720
1721         return 0;
1722
1723 err:
1724         rate->type = LQ_NONE;
1725         return -1;
1726 }
1727
1728 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1729                                          struct iwl_scale_tbl_info *tbl,
1730                                          s32 sr, int low, int high,
1731                                          int current_tpt,
1732                                          int low_tpt, int high_tpt)
1733 {
1734         enum rs_action action = RS_ACTION_STAY;
1735
1736         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1737             (current_tpt == 0)) {
1738                 IWL_DEBUG_RATE(mvm,
1739                                "Decrease rate because of low SR\n");
1740                 return RS_ACTION_DOWNSCALE;
1741         }
1742
1743         if ((low_tpt == IWL_INVALID_VALUE) &&
1744             (high_tpt == IWL_INVALID_VALUE) &&
1745             (high != IWL_RATE_INVALID)) {
1746                 IWL_DEBUG_RATE(mvm,
1747                                "No data about high/low rates. Increase rate\n");
1748                 return RS_ACTION_UPSCALE;
1749         }
1750
1751         if ((high_tpt == IWL_INVALID_VALUE) &&
1752             (high != IWL_RATE_INVALID) &&
1753             (low_tpt != IWL_INVALID_VALUE) &&
1754             (low_tpt < current_tpt)) {
1755                 IWL_DEBUG_RATE(mvm,
1756                                "No data about high rate and low rate is worse. Increase rate\n");
1757                 return RS_ACTION_UPSCALE;
1758         }
1759
1760         if ((high_tpt != IWL_INVALID_VALUE) &&
1761             (high_tpt > current_tpt)) {
1762                 IWL_DEBUG_RATE(mvm,
1763                                "Higher rate is better. Increate rate\n");
1764                 return RS_ACTION_UPSCALE;
1765         }
1766
1767         if ((low_tpt != IWL_INVALID_VALUE) &&
1768             (high_tpt != IWL_INVALID_VALUE) &&
1769             (low_tpt < current_tpt) &&
1770             (high_tpt < current_tpt)) {
1771                 IWL_DEBUG_RATE(mvm,
1772                                "Both high and low are worse. Maintain rate\n");
1773                 return RS_ACTION_STAY;
1774         }
1775
1776         if ((low_tpt != IWL_INVALID_VALUE) &&
1777             (low_tpt > current_tpt)) {
1778                 IWL_DEBUG_RATE(mvm,
1779                                "Lower rate is better\n");
1780                 action = RS_ACTION_DOWNSCALE;
1781                 goto out;
1782         }
1783
1784         if ((low_tpt == IWL_INVALID_VALUE) &&
1785             (low != IWL_RATE_INVALID)) {
1786                 IWL_DEBUG_RATE(mvm,
1787                                "No data about lower rate\n");
1788                 action = RS_ACTION_DOWNSCALE;
1789                 goto out;
1790         }
1791
1792         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1793
1794 out:
1795         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1796                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1797                         IWL_DEBUG_RATE(mvm,
1798                                        "SR is above NO DECREASE. Avoid downscale\n");
1799                         action = RS_ACTION_STAY;
1800                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1801                         IWL_DEBUG_RATE(mvm,
1802                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1803                         action = RS_ACTION_STAY;
1804                 } else {
1805                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1806                 }
1807         }
1808
1809         return action;
1810 }
1811
1812 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1813                           struct iwl_lq_sta *lq_sta)
1814 {
1815         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1816          * supports STBC of at least 1*SS
1817          */
1818         if (!lq_sta->stbc_capable)
1819                 return false;
1820
1821         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1822                 return false;
1823
1824         return true;
1825 }
1826
1827 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1828                                 int *weaker, int *stronger)
1829 {
1830         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1831         if (*weaker > TPC_MAX_REDUCTION)
1832                 *weaker = TPC_INVALID;
1833
1834         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1835         if (*stronger < 0)
1836                 *stronger = TPC_INVALID;
1837 }
1838
1839 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1840                            struct rs_rate *rate, enum ieee80211_band band)
1841 {
1842         int index = rate->index;
1843         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1844         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1845                                 !vif->bss_conf.ps);
1846
1847         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1848                        cam, sta_ps_disabled);
1849         /*
1850          * allow tpc only if power management is enabled, or bt coex
1851          * activity grade allows it and we are on 2.4Ghz.
1852          */
1853         if ((cam || sta_ps_disabled) &&
1854             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1855                 return false;
1856
1857         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1858         if (is_legacy(rate))
1859                 return index == IWL_RATE_54M_INDEX;
1860         if (is_ht(rate))
1861                 return index == IWL_RATE_MCS_7_INDEX;
1862         if (is_vht(rate))
1863                 return index == IWL_RATE_MCS_7_INDEX ||
1864                        index == IWL_RATE_MCS_8_INDEX ||
1865                        index == IWL_RATE_MCS_9_INDEX;
1866
1867         WARN_ON_ONCE(1);
1868         return false;
1869 }
1870
1871 enum tpc_action {
1872         TPC_ACTION_STAY,
1873         TPC_ACTION_DECREASE,
1874         TPC_ACTION_INCREASE,
1875         TPC_ACTION_NO_RESTIRCTION,
1876 };
1877
1878 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1879                                          s32 sr, int weak, int strong,
1880                                          int current_tpt,
1881                                          int weak_tpt, int strong_tpt)
1882 {
1883         /* stay until we have valid tpt */
1884         if (current_tpt == IWL_INVALID_VALUE) {
1885                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1886                 return TPC_ACTION_STAY;
1887         }
1888
1889         /* Too many failures, increase txp */
1890         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1891             current_tpt == 0) {
1892                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1893                 return TPC_ACTION_NO_RESTIRCTION;
1894         }
1895
1896         /* try decreasing first if applicable */
1897         if (weak != TPC_INVALID) {
1898                 if (weak_tpt == IWL_INVALID_VALUE &&
1899                     (strong_tpt == IWL_INVALID_VALUE ||
1900                      current_tpt >= strong_tpt)) {
1901                         IWL_DEBUG_RATE(mvm,
1902                                        "no weak txp measurement. decrease txp\n");
1903                         return TPC_ACTION_DECREASE;
1904                 }
1905
1906                 if (weak_tpt > current_tpt) {
1907                         IWL_DEBUG_RATE(mvm,
1908                                        "lower txp has better tpt. decrease txp\n");
1909                         return TPC_ACTION_DECREASE;
1910                 }
1911         }
1912
1913         /* next, increase if needed */
1914         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1915             strong != TPC_INVALID) {
1916                 if (weak_tpt == IWL_INVALID_VALUE &&
1917                     strong_tpt != IWL_INVALID_VALUE &&
1918                     current_tpt < strong_tpt) {
1919                         IWL_DEBUG_RATE(mvm,
1920                                        "higher txp has better tpt. increase txp\n");
1921                         return TPC_ACTION_INCREASE;
1922                 }
1923
1924                 if (weak_tpt < current_tpt &&
1925                     (strong_tpt == IWL_INVALID_VALUE ||
1926                      strong_tpt > current_tpt)) {
1927                         IWL_DEBUG_RATE(mvm,
1928                                        "lower txp has worse tpt. increase txp\n");
1929                         return TPC_ACTION_INCREASE;
1930                 }
1931         }
1932
1933         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1934         return TPC_ACTION_STAY;
1935 }
1936
1937 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1938                            struct ieee80211_sta *sta,
1939                            struct iwl_lq_sta *lq_sta,
1940                            struct iwl_scale_tbl_info *tbl)
1941 {
1942         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1943         struct ieee80211_vif *vif = mvm_sta->vif;
1944         struct ieee80211_chanctx_conf *chanctx_conf;
1945         enum ieee80211_band band;
1946         struct iwl_rate_scale_data *window;
1947         struct rs_rate *rate = &tbl->rate;
1948         enum tpc_action action;
1949         s32 sr;
1950         u8 cur = lq_sta->lq.reduced_tpc;
1951         int current_tpt;
1952         int weak, strong;
1953         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1954
1955 #ifdef CONFIG_MAC80211_DEBUGFS
1956         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1957                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1958                                lq_sta->pers.dbg_fixed_txp_reduction);
1959                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1960                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1961         }
1962 #endif
1963
1964         rcu_read_lock();
1965         chanctx_conf = rcu_dereference(vif->chanctx_conf);
1966         if (WARN_ON(!chanctx_conf))
1967                 band = IEEE80211_NUM_BANDS;
1968         else
1969                 band = chanctx_conf->def.chan->band;
1970         rcu_read_unlock();
1971
1972         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1973                 IWL_DEBUG_RATE(mvm,
1974                                "tpc is not allowed. remove txp restrictions\n");
1975                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1976                 return cur != TPC_NO_REDUCTION;
1977         }
1978
1979         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1980
1981         /* Collect measured throughputs for current and adjacent rates */
1982         window = tbl->tpc_win;
1983         sr = window[cur].success_ratio;
1984         current_tpt = window[cur].average_tpt;
1985         if (weak != TPC_INVALID)
1986                 weak_tpt = window[weak].average_tpt;
1987         if (strong != TPC_INVALID)
1988                 strong_tpt = window[strong].average_tpt;
1989
1990         IWL_DEBUG_RATE(mvm,
1991                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1992                        cur, current_tpt, sr, weak, strong,
1993                        weak_tpt, strong_tpt);
1994
1995         action = rs_get_tpc_action(mvm, sr, weak, strong,
1996                                    current_tpt, weak_tpt, strong_tpt);
1997
1998         /* override actions if we are on the edge */
1999         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2000                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2001                 action = TPC_ACTION_STAY;
2002         } else if (strong == TPC_INVALID &&
2003                    (action == TPC_ACTION_INCREASE ||
2004                     action == TPC_ACTION_NO_RESTIRCTION)) {
2005                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2006                 action = TPC_ACTION_STAY;
2007         }
2008
2009         switch (action) {
2010         case TPC_ACTION_DECREASE:
2011                 lq_sta->lq.reduced_tpc = weak;
2012                 return true;
2013         case TPC_ACTION_INCREASE:
2014                 lq_sta->lq.reduced_tpc = strong;
2015                 return true;
2016         case TPC_ACTION_NO_RESTIRCTION:
2017                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2018                 return true;
2019         case TPC_ACTION_STAY:
2020                 /* do nothing */
2021                 break;
2022         }
2023         return false;
2024 }
2025
2026 /*
2027  * Do rate scaling and search for new modulation mode.
2028  */
2029 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2030                                   struct ieee80211_sta *sta,
2031                                   struct iwl_lq_sta *lq_sta,
2032                                   int tid)
2033 {
2034         int low = IWL_RATE_INVALID;
2035         int high = IWL_RATE_INVALID;
2036         int index;
2037         struct iwl_rate_scale_data *window = NULL;
2038         int current_tpt = IWL_INVALID_VALUE;
2039         int low_tpt = IWL_INVALID_VALUE;
2040         int high_tpt = IWL_INVALID_VALUE;
2041         u32 fail_count;
2042         enum rs_action scale_action = RS_ACTION_STAY;
2043         u16 rate_mask;
2044         u8 update_lq = 0;
2045         struct iwl_scale_tbl_info *tbl, *tbl1;
2046         u8 active_tbl = 0;
2047         u8 done_search = 0;
2048         u16 high_low;
2049         s32 sr;
2050         u8 prev_agg = lq_sta->is_agg;
2051         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2052         struct iwl_mvm_tid_data *tid_data;
2053         struct rs_rate *rate;
2054
2055         lq_sta->is_agg = !!sta_priv->agg_tids;
2056
2057         /*
2058          * Select rate-scale / modulation-mode table to work with in
2059          * the rest of this function:  "search" if searching for better
2060          * modulation mode, or "active" if doing rate scaling within a mode.
2061          */
2062         if (!lq_sta->search_better_tbl)
2063                 active_tbl = lq_sta->active_tbl;
2064         else
2065                 active_tbl = 1 - lq_sta->active_tbl;
2066
2067         tbl = &(lq_sta->lq_info[active_tbl]);
2068         rate = &tbl->rate;
2069
2070         if (prev_agg != lq_sta->is_agg) {
2071                 IWL_DEBUG_RATE(mvm,
2072                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2073                                prev_agg, lq_sta->is_agg);
2074                 rs_set_expected_tpt_table(lq_sta, tbl);
2075                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2076         }
2077
2078         /* current tx rate */
2079         index = lq_sta->last_txrate_idx;
2080
2081         /* rates available for this association, and for modulation mode */
2082         rate_mask = rs_get_supported_rates(lq_sta, rate);
2083
2084         if (!(BIT(index) & rate_mask)) {
2085                 IWL_ERR(mvm, "Current Rate is not valid\n");
2086                 if (lq_sta->search_better_tbl) {
2087                         /* revert to active table if search table is not valid*/
2088                         rate->type = LQ_NONE;
2089                         lq_sta->search_better_tbl = 0;
2090                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2091                         rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2092                 }
2093                 return;
2094         }
2095
2096         /* Get expected throughput table and history window for current rate */
2097         if (!tbl->expected_tpt) {
2098                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2099                 return;
2100         }
2101
2102         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2103         window = &(tbl->win[index]);
2104
2105         /*
2106          * If there is not enough history to calculate actual average
2107          * throughput, keep analyzing results of more tx frames, without
2108          * changing rate or mode (bypass most of the rest of this function).
2109          * Set up new rate table in uCode only if old rate is not supported
2110          * in current association (use new rate found above).
2111          */
2112         fail_count = window->counter - window->success_counter;
2113         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2114             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2115                 IWL_DEBUG_RATE(mvm,
2116                                "(%s: %d): Test Window: succ %d total %d\n",
2117                                rs_pretty_lq_type(rate->type),
2118                                index, window->success_counter, window->counter);
2119
2120                 /* Can't calculate this yet; not enough history */
2121                 window->average_tpt = IWL_INVALID_VALUE;
2122
2123                 /* Should we stay with this modulation mode,
2124                  * or search for a new one? */
2125                 rs_stay_in_table(lq_sta, false);
2126
2127                 goto out;
2128         }
2129         /* Else we have enough samples; calculate estimate of
2130          * actual average throughput */
2131         if (window->average_tpt != ((window->success_ratio *
2132                         tbl->expected_tpt[index] + 64) / 128)) {
2133                 window->average_tpt = ((window->success_ratio *
2134                                         tbl->expected_tpt[index] + 64) / 128);
2135         }
2136
2137         /* If we are searching for better modulation mode, check success. */
2138         if (lq_sta->search_better_tbl) {
2139                 /* If good success, continue using the "search" mode;
2140                  * no need to send new link quality command, since we're
2141                  * continuing to use the setup that we've been trying. */
2142                 if (window->average_tpt > lq_sta->last_tpt) {
2143                         IWL_DEBUG_RATE(mvm,
2144                                        "SWITCHING TO NEW TABLE SR: %d "
2145                                        "cur-tpt %d old-tpt %d\n",
2146                                        window->success_ratio,
2147                                        window->average_tpt,
2148                                        lq_sta->last_tpt);
2149
2150                         /* Swap tables; "search" becomes "active" */
2151                         lq_sta->active_tbl = active_tbl;
2152                         current_tpt = window->average_tpt;
2153                 /* Else poor success; go back to mode in "active" table */
2154                 } else {
2155                         IWL_DEBUG_RATE(mvm,
2156                                        "GOING BACK TO THE OLD TABLE: SR %d "
2157                                        "cur-tpt %d old-tpt %d\n",
2158                                        window->success_ratio,
2159                                        window->average_tpt,
2160                                        lq_sta->last_tpt);
2161
2162                         /* Nullify "search" table */
2163                         rate->type = LQ_NONE;
2164
2165                         /* Revert to "active" table */
2166                         active_tbl = lq_sta->active_tbl;
2167                         tbl = &(lq_sta->lq_info[active_tbl]);
2168
2169                         /* Revert to "active" rate and throughput info */
2170                         index = tbl->rate.index;
2171                         current_tpt = lq_sta->last_tpt;
2172
2173                         /* Need to set up a new rate table in uCode */
2174                         update_lq = 1;
2175                 }
2176
2177                 /* Either way, we've made a decision; modulation mode
2178                  * search is done, allow rate adjustment next time. */
2179                 lq_sta->search_better_tbl = 0;
2180                 done_search = 1;        /* Don't switch modes below! */
2181                 goto lq_update;
2182         }
2183
2184         /* (Else) not in search of better modulation mode, try for better
2185          * starting rate, while staying in this mode. */
2186         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2187         low = high_low & 0xff;
2188         high = (high_low >> 8) & 0xff;
2189
2190         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2191
2192         sr = window->success_ratio;
2193
2194         /* Collect measured throughputs for current and adjacent rates */
2195         current_tpt = window->average_tpt;
2196         if (low != IWL_RATE_INVALID)
2197                 low_tpt = tbl->win[low].average_tpt;
2198         if (high != IWL_RATE_INVALID)
2199                 high_tpt = tbl->win[high].average_tpt;
2200
2201         IWL_DEBUG_RATE(mvm,
2202                        "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2203                        rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2204                        low, high, low_tpt, high_tpt);
2205
2206         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2207                                           current_tpt, low_tpt, high_tpt);
2208
2209         /* Force a search in case BT doesn't like us being in MIMO */
2210         if (is_mimo(rate) &&
2211             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2212                 IWL_DEBUG_RATE(mvm,
2213                                "BT Coex forbids MIMO. Search for new config\n");
2214                 rs_stay_in_table(lq_sta, true);
2215                 goto lq_update;
2216         }
2217
2218         switch (scale_action) {
2219         case RS_ACTION_DOWNSCALE:
2220                 /* Decrease starting rate, update uCode's rate table */
2221                 if (low != IWL_RATE_INVALID) {
2222                         update_lq = 1;
2223                         index = low;
2224                 } else {
2225                         IWL_DEBUG_RATE(mvm,
2226                                        "At the bottom rate. Can't decrease\n");
2227                 }
2228
2229                 break;
2230         case RS_ACTION_UPSCALE:
2231                 /* Increase starting rate, update uCode's rate table */
2232                 if (high != IWL_RATE_INVALID) {
2233                         update_lq = 1;
2234                         index = high;
2235                 } else {
2236                         IWL_DEBUG_RATE(mvm,
2237                                        "At the top rate. Can't increase\n");
2238                 }
2239
2240                 break;
2241         case RS_ACTION_STAY:
2242                 /* No change */
2243                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2244                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2245                 break;
2246         default:
2247                 break;
2248         }
2249
2250 lq_update:
2251         /* Replace uCode's rate table for the destination station. */
2252         if (update_lq) {
2253                 tbl->rate.index = index;
2254                 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2255         }
2256
2257         rs_stay_in_table(lq_sta, false);
2258
2259         /*
2260          * Search for new modulation mode if we're:
2261          * 1)  Not changing rates right now
2262          * 2)  Not just finishing up a search
2263          * 3)  Allowing a new search
2264          */
2265         if (!update_lq && !done_search &&
2266             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2267             && window->counter) {
2268                 enum rs_column next_column;
2269
2270                 /* Save current throughput to compare with "search" throughput*/
2271                 lq_sta->last_tpt = current_tpt;
2272
2273                 IWL_DEBUG_RATE(mvm,
2274                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2275                                update_lq, done_search, lq_sta->rs_state,
2276                                window->counter);
2277
2278                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2279                 if (next_column != RS_COLUMN_INVALID) {
2280                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2281                                                       next_column);
2282                         if (!ret)
2283                                 lq_sta->search_better_tbl = 1;
2284                 } else {
2285                         IWL_DEBUG_RATE(mvm,
2286                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2287                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2288                 }
2289
2290                 /* If new "search" mode was selected, set up in uCode table */
2291                 if (lq_sta->search_better_tbl) {
2292                         /* Access the "search" table, clear its history. */
2293                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2294                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2295
2296                         /* Use new "search" start rate */
2297                         index = tbl->rate.index;
2298
2299                         rs_dump_rate(mvm, &tbl->rate,
2300                                      "Switch to SEARCH TABLE:");
2301                         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
2302                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2303                 } else {
2304                         done_search = 1;
2305                 }
2306         }
2307
2308         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2309                 /* If the "active" (non-search) mode was legacy,
2310                  * and we've tried switching antennas,
2311                  * but we haven't been able to try HT modes (not available),
2312                  * stay with best antenna legacy modulation for a while
2313                  * before next round of mode comparisons. */
2314                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2315                 if (is_legacy(&tbl1->rate)) {
2316                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2317
2318                         if (tid != IWL_MAX_TID_COUNT) {
2319                                 tid_data = &sta_priv->tid_data[tid];
2320                                 if (tid_data->state != IWL_AGG_OFF) {
2321                                         IWL_DEBUG_RATE(mvm,
2322                                                        "Stop aggregation on tid %d\n",
2323                                                        tid);
2324                                         ieee80211_stop_tx_ba_session(sta, tid);
2325                                 }
2326                         }
2327                         rs_set_stay_in_table(mvm, 1, lq_sta);
2328                 } else {
2329                 /* If we're in an HT mode, and all 3 mode switch actions
2330                  * have been tried and compared, stay in this best modulation
2331                  * mode for a while before next round of mode comparisons. */
2332                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2333                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2334                             (tid != IWL_MAX_TID_COUNT)) {
2335                                 tid_data = &sta_priv->tid_data[tid];
2336                                 if (tid_data->state == IWL_AGG_OFF) {
2337                                         IWL_DEBUG_RATE(mvm,
2338                                                        "try to aggregate tid %d\n",
2339                                                        tid);
2340                                         rs_tl_turn_on_agg(mvm, tid,
2341                                                           lq_sta, sta);
2342                                 }
2343                         }
2344                         rs_set_stay_in_table(mvm, 0, lq_sta);
2345                 }
2346         }
2347
2348 out:
2349         lq_sta->last_txrate_idx = index;
2350 }
2351
2352 struct rs_init_rate_info {
2353         s8 rssi;
2354         u8 rate_idx;
2355 };
2356
2357 static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
2358         { -60, IWL_RATE_54M_INDEX },
2359         { -64, IWL_RATE_48M_INDEX },
2360         { -68, IWL_RATE_36M_INDEX },
2361         { -80, IWL_RATE_24M_INDEX },
2362         { -84, IWL_RATE_18M_INDEX },
2363         { -85, IWL_RATE_12M_INDEX },
2364         { -86, IWL_RATE_11M_INDEX },
2365         { -88, IWL_RATE_5M_INDEX  },
2366         { -90, IWL_RATE_2M_INDEX  },
2367         { S8_MIN, IWL_RATE_1M_INDEX },
2368 };
2369
2370 static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
2371         { -60, IWL_RATE_54M_INDEX },
2372         { -64, IWL_RATE_48M_INDEX },
2373         { -72, IWL_RATE_36M_INDEX },
2374         { -80, IWL_RATE_24M_INDEX },
2375         { -84, IWL_RATE_18M_INDEX },
2376         { -85, IWL_RATE_12M_INDEX },
2377         { -87, IWL_RATE_9M_INDEX  },
2378         { S8_MIN, IWL_RATE_6M_INDEX },
2379 };
2380
2381 /* Choose an initial legacy rate and antenna to use based on the RSSI
2382  * of last Rx
2383  */
2384 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2385                                 struct iwl_lq_sta *lq_sta,
2386                                 enum ieee80211_band band,
2387                                 struct rs_rate *rate)
2388 {
2389         int i, nentries;
2390         s8 best_rssi = S8_MIN;
2391         u8 best_ant = ANT_NONE;
2392         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2393         const struct rs_init_rate_info *initial_rates;
2394
2395         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2396                 if (!(lq_sta->pers.chains & BIT(i)))
2397                         continue;
2398
2399                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2400                         best_rssi = lq_sta->pers.chain_signal[i];
2401                         best_ant = BIT(i);
2402                 }
2403         }
2404
2405         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2406                        rs_pretty_ant(best_ant), best_rssi);
2407
2408         if (best_ant != ANT_A && best_ant != ANT_B)
2409                 rate->ant = first_antenna(valid_tx_ant);
2410         else
2411                 rate->ant = best_ant;
2412
2413         rate->sgi = false;
2414         rate->ldpc = false;
2415         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2416
2417         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2418                                      BITS_PER_LONG);
2419
2420         if (band == IEEE80211_BAND_5GHZ) {
2421                 rate->type = LQ_LEGACY_A;
2422                 initial_rates = rs_init_rates_5ghz;
2423                 nentries = ARRAY_SIZE(rs_init_rates_5ghz);
2424         } else {
2425                 rate->type = LQ_LEGACY_G;
2426                 initial_rates = rs_init_rates_24ghz;
2427                 nentries = ARRAY_SIZE(rs_init_rates_24ghz);
2428         }
2429
2430         if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2431                 for (i = 0; i < nentries; i++) {
2432                         int rate_idx = initial_rates[i].rate_idx;
2433                         if ((best_rssi >= initial_rates[i].rssi) &&
2434                             (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2435                                 rate->index = rate_idx;
2436                                 break;
2437                         }
2438                 }
2439         }
2440
2441         IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2442                        rs_pretty_ant(rate->ant));
2443 }
2444
2445 /* Save info about RSSI of last Rx */
2446 void rs_update_last_rssi(struct iwl_mvm *mvm,
2447                          struct iwl_lq_sta *lq_sta,
2448                          struct ieee80211_rx_status *rx_status)
2449 {
2450         lq_sta->pers.chains = rx_status->chains;
2451         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2452         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2453         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2454 }
2455
2456 /**
2457  * rs_initialize_lq - Initialize a station's hardware rate table
2458  *
2459  * The uCode's station table contains a table of fallback rates
2460  * for automatic fallback during transmission.
2461  *
2462  * NOTE: This sets up a default set of values.  These will be replaced later
2463  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2464  *       rc80211_simple.
2465  *
2466  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2467  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2468  *       which requires station table entry to exist).
2469  */
2470 static void rs_initialize_lq(struct iwl_mvm *mvm,
2471                              struct ieee80211_sta *sta,
2472                              struct iwl_lq_sta *lq_sta,
2473                              enum ieee80211_band band,
2474                              bool init)
2475 {
2476         struct iwl_scale_tbl_info *tbl;
2477         struct rs_rate *rate;
2478         u8 active_tbl = 0;
2479
2480         if (!sta || !lq_sta)
2481                 return;
2482
2483         if (!lq_sta->search_better_tbl)
2484                 active_tbl = lq_sta->active_tbl;
2485         else
2486                 active_tbl = 1 - lq_sta->active_tbl;
2487
2488         tbl = &(lq_sta->lq_info[active_tbl]);
2489         rate = &tbl->rate;
2490
2491         rs_get_initial_rate(mvm, lq_sta, band, rate);
2492         lq_sta->last_txrate_idx = rate->index;
2493
2494         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2495         if (rate->ant == ANT_A)
2496                 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2497         else
2498                 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2499
2500         rs_set_expected_tpt_table(lq_sta, tbl);
2501         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2502         /* TODO restore station should remember the lq cmd */
2503         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2504 }
2505
2506 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2507                         struct ieee80211_tx_rate_control *txrc)
2508 {
2509         struct sk_buff *skb = txrc->skb;
2510         struct iwl_op_mode *op_mode __maybe_unused =
2511                         (struct iwl_op_mode *)mvm_r;
2512         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2513         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2514         struct iwl_lq_sta *lq_sta = mvm_sta;
2515
2516         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2517
2518         /* Treat uninitialized rate scaling data same as non-existing. */
2519         if (lq_sta && !lq_sta->pers.drv) {
2520                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2521                 mvm_sta = NULL;
2522         }
2523
2524         /* Send management frames and NO_ACK data using lowest rate. */
2525         if (rate_control_send_low(sta, mvm_sta, txrc))
2526                 return;
2527
2528         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2529                                   info->band, &info->control.rates[0]);
2530
2531         info->control.rates[0].count = 1;
2532 }
2533
2534 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2535                           gfp_t gfp)
2536 {
2537         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2538         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2539         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2540         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2541
2542         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2543
2544         lq_sta->pers.drv = mvm;
2545 #ifdef CONFIG_MAC80211_DEBUGFS
2546         lq_sta->pers.dbg_fixed_rate = 0;
2547         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2548         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2549 #endif
2550         lq_sta->pers.chains = 0;
2551         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2552
2553         return &sta_priv->lq_sta;
2554 }
2555
2556 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2557                                        int nss)
2558 {
2559         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2560                 (0x3 << (2 * (nss - 1)));
2561         rx_mcs >>= (2 * (nss - 1));
2562
2563         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2564                 return IWL_RATE_MCS_7_INDEX;
2565         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2566                 return IWL_RATE_MCS_8_INDEX;
2567         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2568                 return IWL_RATE_MCS_9_INDEX;
2569
2570         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2571         return -1;
2572 }
2573
2574 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2575                                      struct ieee80211_sta_vht_cap *vht_cap,
2576                                      struct iwl_lq_sta *lq_sta)
2577 {
2578         int i;
2579         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2580
2581         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2582                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2583                         if (i == IWL_RATE_9M_INDEX)
2584                                 continue;
2585
2586                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2587                         if (i == IWL_RATE_MCS_9_INDEX &&
2588                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2589                                 continue;
2590
2591                         lq_sta->active_siso_rate |= BIT(i);
2592                 }
2593         }
2594
2595         if (sta->rx_nss < 2)
2596                 return;
2597
2598         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2599         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2600                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2601                         if (i == IWL_RATE_9M_INDEX)
2602                                 continue;
2603
2604                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2605                         if (i == IWL_RATE_MCS_9_INDEX &&
2606                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2607                                 continue;
2608
2609                         lq_sta->active_mimo2_rate |= BIT(i);
2610                 }
2611         }
2612 }
2613
2614 static void rs_ht_init(struct iwl_mvm *mvm,
2615                        struct ieee80211_sta *sta,
2616                        struct iwl_lq_sta *lq_sta,
2617                        struct ieee80211_sta_ht_cap *ht_cap)
2618 {
2619         /* active_siso_rate mask includes 9 MBits (bit 5),
2620          * and CCK (bits 0-3), supp_rates[] does not;
2621          * shift to convert format, force 9 MBits off.
2622          */
2623         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2624         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2625         lq_sta->active_siso_rate &= ~((u16)0x2);
2626         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2627
2628         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2629         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2630         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2631         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2632
2633         if (mvm->cfg->ht_params->ldpc &&
2634             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2635                 lq_sta->ldpc = true;
2636
2637         if (mvm->cfg->ht_params->stbc &&
2638             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2639             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2640                 lq_sta->stbc_capable = true;
2641
2642         lq_sta->is_vht = false;
2643 }
2644
2645 static void rs_vht_init(struct iwl_mvm *mvm,
2646                         struct ieee80211_sta *sta,
2647                         struct iwl_lq_sta *lq_sta,
2648                         struct ieee80211_sta_vht_cap *vht_cap)
2649 {
2650         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2651
2652         if (mvm->cfg->ht_params->ldpc &&
2653             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2654                 lq_sta->ldpc = true;
2655
2656         if (mvm->cfg->ht_params->stbc &&
2657             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2658             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2659                 lq_sta->stbc_capable = true;
2660
2661         if ((mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2662             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2663             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2664                 lq_sta->bfer_capable = true;
2665
2666         lq_sta->is_vht = true;
2667 }
2668
2669 #ifdef CONFIG_IWLWIFI_DEBUGFS
2670 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2671 {
2672         spin_lock_bh(&mvm->drv_stats_lock);
2673         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2674         spin_unlock_bh(&mvm->drv_stats_lock);
2675 }
2676
2677 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2678 {
2679         u8 nss = 0, mcs = 0;
2680
2681         spin_lock(&mvm->drv_stats_lock);
2682
2683         if (agg)
2684                 mvm->drv_rx_stats.agg_frames++;
2685
2686         mvm->drv_rx_stats.success_frames++;
2687
2688         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2689         case RATE_MCS_CHAN_WIDTH_20:
2690                 mvm->drv_rx_stats.bw_20_frames++;
2691                 break;
2692         case RATE_MCS_CHAN_WIDTH_40:
2693                 mvm->drv_rx_stats.bw_40_frames++;
2694                 break;
2695         case RATE_MCS_CHAN_WIDTH_80:
2696                 mvm->drv_rx_stats.bw_80_frames++;
2697                 break;
2698         default:
2699                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2700         }
2701
2702         if (rate & RATE_MCS_HT_MSK) {
2703                 mvm->drv_rx_stats.ht_frames++;
2704                 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2705                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2706         } else if (rate & RATE_MCS_VHT_MSK) {
2707                 mvm->drv_rx_stats.vht_frames++;
2708                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2709                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2710                        RATE_VHT_MCS_NSS_POS) + 1;
2711         } else {
2712                 mvm->drv_rx_stats.legacy_frames++;
2713         }
2714
2715         if (nss == 1)
2716                 mvm->drv_rx_stats.siso_frames++;
2717         else if (nss == 2)
2718                 mvm->drv_rx_stats.mimo2_frames++;
2719
2720         if (rate & RATE_MCS_SGI_MSK)
2721                 mvm->drv_rx_stats.sgi_frames++;
2722         else
2723                 mvm->drv_rx_stats.ngi_frames++;
2724
2725         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2726         mvm->drv_rx_stats.last_frame_idx =
2727                 (mvm->drv_rx_stats.last_frame_idx + 1) %
2728                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2729
2730         spin_unlock(&mvm->drv_stats_lock);
2731 }
2732 #endif
2733
2734 /*
2735  * Called after adding a new station to initialize rate scaling
2736  */
2737 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2738                           enum ieee80211_band band, bool init)
2739 {
2740         int i, j;
2741         struct ieee80211_hw *hw = mvm->hw;
2742         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2743         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2744         struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2745         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2746         struct ieee80211_supported_band *sband;
2747         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2748
2749         /* clear all non-persistent lq data */
2750         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2751
2752         sband = hw->wiphy->bands[band];
2753
2754         lq_sta->lq.sta_id = sta_priv->sta_id;
2755
2756         for (j = 0; j < LQ_SIZE; j++)
2757                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2758
2759         lq_sta->flush_timer = 0;
2760         lq_sta->last_tx = jiffies;
2761
2762         IWL_DEBUG_RATE(mvm,
2763                        "LQ: *** rate scale station global init for station %d ***\n",
2764                        sta_priv->sta_id);
2765         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2766          * the lowest or the highest rate.. Could consider using RSSI from
2767          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2768          * after assoc.. */
2769
2770         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2771         lq_sta->band = sband->band;
2772         /*
2773          * active legacy rates as per supported rates bitmap
2774          */
2775         supp = sta->supp_rates[sband->band];
2776         lq_sta->active_legacy_rate = 0;
2777         for_each_set_bit(i, &supp, BITS_PER_LONG)
2778                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2779
2780         /* TODO: should probably account for rx_highest for both HT/VHT */
2781         if (!vht_cap || !vht_cap->vht_supported)
2782                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
2783         else
2784                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
2785
2786         if (IWL_MVM_RS_DISABLE_P2P_MIMO && sta_priv->vif->p2p)
2787                 lq_sta->active_mimo2_rate = 0;
2788
2789         lq_sta->max_legacy_rate_idx =
2790                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2791         lq_sta->max_siso_rate_idx =
2792                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2793         lq_sta->max_mimo2_rate_idx =
2794                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2795
2796         IWL_DEBUG_RATE(mvm,
2797                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2798                        lq_sta->active_legacy_rate,
2799                        lq_sta->active_siso_rate,
2800                        lq_sta->active_mimo2_rate,
2801                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
2802                        lq_sta->bfer_capable);
2803         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2804                        lq_sta->max_legacy_rate_idx,
2805                        lq_sta->max_siso_rate_idx,
2806                        lq_sta->max_mimo2_rate_idx);
2807
2808         /* These values will be overridden later */
2809         lq_sta->lq.single_stream_ant_msk =
2810                 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
2811         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2812
2813         /* as default allow aggregation for all tids */
2814         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2815         lq_sta->is_agg = 0;
2816 #ifdef CONFIG_IWLWIFI_DEBUGFS
2817         iwl_mvm_reset_frame_stats(mvm);
2818 #endif
2819         rs_initialize_lq(mvm, sta, lq_sta, band, init);
2820 }
2821
2822 static void rs_rate_update(void *mvm_r,
2823                            struct ieee80211_supported_band *sband,
2824                            struct cfg80211_chan_def *chandef,
2825                            struct ieee80211_sta *sta, void *priv_sta,
2826                            u32 changed)
2827 {
2828         u8 tid;
2829         struct iwl_op_mode *op_mode  =
2830                         (struct iwl_op_mode *)mvm_r;
2831         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2832
2833         /* Stop any ongoing aggregations as rs starts off assuming no agg */
2834         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2835                 ieee80211_stop_tx_ba_session(sta, tid);
2836
2837         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2838 }
2839
2840 #ifdef CONFIG_MAC80211_DEBUGFS
2841 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2842                                             struct iwl_lq_cmd *lq_cmd,
2843                                             enum ieee80211_band band,
2844                                             u32 ucode_rate)
2845 {
2846         struct rs_rate rate;
2847         int i;
2848         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2849         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2850         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2851
2852         for (i = 0; i < num_rates; i++)
2853                 lq_cmd->rs_table[i] = ucode_rate_le32;
2854
2855         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2856
2857         if (is_mimo(&rate))
2858                 lq_cmd->mimo_delim = num_rates - 1;
2859         else
2860                 lq_cmd->mimo_delim = 0;
2861
2862         lq_cmd->reduced_tpc = 0;
2863
2864         if (num_of_ant(ant) == 1)
2865                 lq_cmd->single_stream_ant_msk = ant;
2866
2867         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2868 }
2869 #endif /* CONFIG_MAC80211_DEBUGFS */
2870
2871 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2872                                      struct iwl_lq_sta *lq_sta,
2873                                      struct rs_rate *rate,
2874                                      __le32 *rs_table, int *rs_table_index,
2875                                      int num_rates, int num_retries,
2876                                      u8 valid_tx_ant, bool toggle_ant)
2877 {
2878         int i, j;
2879         __le32 ucode_rate;
2880         bool bottom_reached = false;
2881         int prev_rate_idx = rate->index;
2882         int end = LINK_QUAL_MAX_RETRY_NUM;
2883         int index = *rs_table_index;
2884
2885         for (i = 0; i < num_rates && index < end; i++) {
2886                 for (j = 0; j < num_retries && index < end; j++, index++) {
2887                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
2888                                                                          rate));
2889                         rs_table[index] = ucode_rate;
2890                         if (toggle_ant)
2891                                 rs_toggle_antenna(valid_tx_ant, rate);
2892                 }
2893
2894                 prev_rate_idx = rate->index;
2895                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2896                 if (bottom_reached && !is_legacy(rate))
2897                         break;
2898         }
2899
2900         if (!bottom_reached && !is_legacy(rate))
2901                 rate->index = prev_rate_idx;
2902
2903         *rs_table_index = index;
2904 }
2905
2906 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2907  * column the rate table should look like this:
2908  *
2909  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2910  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2911  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2912  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2913  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2914  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2915  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2916  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2917  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2918  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2919  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2920  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2921  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2922  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2923  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2924  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2925  */
2926 static void rs_build_rates_table(struct iwl_mvm *mvm,
2927                                  struct ieee80211_sta *sta,
2928                                  struct iwl_lq_sta *lq_sta,
2929                                  const struct rs_rate *initial_rate)
2930 {
2931         struct rs_rate rate;
2932         int num_rates, num_retries, index = 0;
2933         u8 valid_tx_ant = 0;
2934         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2935         bool toggle_ant = false;
2936
2937         memcpy(&rate, initial_rate, sizeof(rate));
2938
2939         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2940
2941         /* TODO: remove old API when min FW API hits 14 */
2942         if (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
2943             rs_stbc_allow(mvm, sta, lq_sta))
2944                 rate.stbc = true;
2945
2946         if (is_siso(&rate)) {
2947                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
2948                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
2949         } else if (is_mimo(&rate)) {
2950                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
2951                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
2952         } else {
2953                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
2954                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
2955                 toggle_ant = true;
2956         }
2957
2958         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2959                                  num_rates, num_retries, valid_tx_ant,
2960                                  toggle_ant);
2961
2962         rs_get_lower_rate_down_column(lq_sta, &rate);
2963
2964         if (is_siso(&rate)) {
2965                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
2966                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
2967                 lq_cmd->mimo_delim = index;
2968         } else if (is_legacy(&rate)) {
2969                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
2970                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
2971         } else {
2972                 WARN_ON_ONCE(1);
2973         }
2974
2975         toggle_ant = true;
2976
2977         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2978                                  num_rates, num_retries, valid_tx_ant,
2979                                  toggle_ant);
2980
2981         rs_get_lower_rate_down_column(lq_sta, &rate);
2982
2983         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
2984         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
2985
2986         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2987                                  num_rates, num_retries, valid_tx_ant,
2988                                  toggle_ant);
2989
2990 }
2991
2992 struct rs_bfer_active_iter_data {
2993         struct ieee80211_sta *exclude_sta;
2994         struct iwl_mvm_sta *bfer_mvmsta;
2995 };
2996
2997 static void rs_bfer_active_iter(void *_data,
2998                                 struct ieee80211_sta *sta)
2999 {
3000         struct rs_bfer_active_iter_data *data = _data;
3001         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3002         struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3003         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3004
3005         if (sta == data->exclude_sta)
3006                 return;
3007
3008         /* The current sta has BFER allowed */
3009         if (ss_params & LQ_SS_BFER_ALLOWED) {
3010                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3011
3012                 data->bfer_mvmsta = mvmsta;
3013         }
3014 }
3015
3016 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3017 {
3018         int prio = -1;
3019         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3020
3021         switch (viftype) {
3022         case NL80211_IFTYPE_AP:
3023         case NL80211_IFTYPE_P2P_GO:
3024                 prio = 3;
3025                 break;
3026         case NL80211_IFTYPE_P2P_CLIENT:
3027                 prio = 2;
3028                 break;
3029         case NL80211_IFTYPE_STATION:
3030                 prio = 1;
3031                 break;
3032         default:
3033                 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3034                 prio = -1;
3035         }
3036
3037         return prio;
3038 }
3039
3040 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3041 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3042                                 struct iwl_mvm_sta *sta2)
3043 {
3044         int prio1 = rs_bfer_priority(sta1);
3045         int prio2 = rs_bfer_priority(sta2);
3046
3047         if (prio1 > prio2)
3048                 return 1;
3049         if (prio1 < prio2)
3050                 return -1;
3051         return 0;
3052 }
3053
3054 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3055                                 struct ieee80211_sta *sta,
3056                                 struct iwl_lq_sta *lq_sta,
3057                                 const struct rs_rate *initial_rate)
3058 {
3059         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3060         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3061         struct rs_bfer_active_iter_data data = {
3062                 .exclude_sta = sta,
3063                 .bfer_mvmsta = NULL,
3064         };
3065         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3066         u32 ss_params = LQ_SS_PARAMS_VALID;
3067
3068         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3069                 goto out;
3070
3071 #ifdef CONFIG_MAC80211_DEBUGFS
3072         /* Check if forcing the decision is configured.
3073          * Note that SISO is forced by not allowing STBC or BFER
3074          */
3075         if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3076                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3077         else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3078                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3079
3080         if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3081                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3082                                lq_sta->pers.ss_force);
3083                 goto out;
3084         }
3085 #endif
3086
3087         if (lq_sta->stbc_capable)
3088                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3089
3090         if (!lq_sta->bfer_capable)
3091                 goto out;
3092
3093         ieee80211_iterate_stations_atomic(mvm->hw,
3094                                           rs_bfer_active_iter,
3095                                           &data);
3096         bfer_mvmsta = data.bfer_mvmsta;
3097
3098         /* This code is safe as it doesn't run concurrently for different
3099          * stations. This is guaranteed by the fact that calls to
3100          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3101          */
3102         if (!bfer_mvmsta) {
3103                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3104
3105                 ss_params |= LQ_SS_BFER_ALLOWED;
3106                 goto out;
3107         }
3108
3109         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3110                        bfer_mvmsta->sta_id);
3111
3112         /* Disallow BFER on another STA if active and we're a higher priority */
3113         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3114                 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3115                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3116
3117                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3118                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3119                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3120
3121                 ss_params |= LQ_SS_BFER_ALLOWED;
3122                 IWL_DEBUG_RATE(mvm,
3123                                "Lower priority BFER sta found (%d). Switch BFER\n",
3124                                bfer_mvmsta->sta_id);
3125         }
3126 out:
3127         lq_cmd->ss_params = cpu_to_le32(ss_params);
3128 }
3129
3130 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3131                            struct ieee80211_sta *sta,
3132                            struct iwl_lq_sta *lq_sta,
3133                            const struct rs_rate *initial_rate)
3134 {
3135         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3136         struct iwl_mvm_sta *mvmsta;
3137         struct iwl_mvm_vif *mvmvif;
3138
3139         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3140         lq_cmd->agg_time_limit =
3141                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3142
3143 #ifdef CONFIG_MAC80211_DEBUGFS
3144         if (lq_sta->pers.dbg_fixed_rate) {
3145                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3146                                                 lq_sta->band,
3147                                                 lq_sta->pers.dbg_fixed_rate);
3148                 return;
3149         }
3150 #endif
3151         if (WARN_ON_ONCE(!sta || !initial_rate))
3152                 return;
3153
3154         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3155
3156         if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS)
3157                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3158
3159         if (num_of_ant(initial_rate->ant) == 1)
3160                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3161
3162         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3163         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3164
3165         if (num_of_ant(initial_rate->ant) == 1)
3166                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3167
3168         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3169
3170         /*
3171          * In case of low latency, tell the firwmare to leave a frame in the
3172          * Tx Fifo so that it can start a transaction in the same TxOP. This
3173          * basically allows the firmware to send bursts.
3174          */
3175         if (iwl_mvm_vif_low_latency(mvmvif)) {
3176                 lq_cmd->agg_frame_cnt_limit--;
3177
3178                 if (mvm->low_latency_agg_frame_limit)
3179                         lq_cmd->agg_frame_cnt_limit =
3180                                 min(lq_cmd->agg_frame_cnt_limit,
3181                                     mvm->low_latency_agg_frame_limit);
3182         }
3183
3184         if (mvmsta->vif->p2p)
3185                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3186
3187         lq_cmd->agg_time_limit =
3188                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3189 }
3190
3191 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3192 {
3193         return hw->priv;
3194 }
3195 /* rate scale requires free function to be implemented */
3196 static void rs_free(void *mvm_rate)
3197 {
3198         return;
3199 }
3200
3201 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3202                         void *mvm_sta)
3203 {
3204         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3205         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3206
3207         IWL_DEBUG_RATE(mvm, "enter\n");
3208         IWL_DEBUG_RATE(mvm, "leave\n");
3209 }
3210
3211 #ifdef CONFIG_MAC80211_DEBUGFS
3212 int rs_pretty_print_rate(char *buf, const u32 rate)
3213 {
3214
3215         char *type, *bw;
3216         u8 mcs = 0, nss = 0;
3217         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3218
3219         if (!(rate & RATE_MCS_HT_MSK) &&
3220             !(rate & RATE_MCS_VHT_MSK)) {
3221                 int index = iwl_hwrate_to_plcp_idx(rate);
3222
3223                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3224                                rs_pretty_ant(ant),
3225                                index == IWL_RATE_INVALID ? "BAD" :
3226                                iwl_rate_mcs[index].mbps);
3227         }
3228
3229         if (rate & RATE_MCS_VHT_MSK) {
3230                 type = "VHT";
3231                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3232                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3233                        >> RATE_VHT_MCS_NSS_POS) + 1;
3234         } else if (rate & RATE_MCS_HT_MSK) {
3235                 type = "HT";
3236                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3237         } else {
3238                 type = "Unknown"; /* shouldn't happen */
3239         }
3240
3241         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3242         case RATE_MCS_CHAN_WIDTH_20:
3243                 bw = "20Mhz";
3244                 break;
3245         case RATE_MCS_CHAN_WIDTH_40:
3246                 bw = "40Mhz";
3247                 break;
3248         case RATE_MCS_CHAN_WIDTH_80:
3249                 bw = "80Mhz";
3250                 break;
3251         case RATE_MCS_CHAN_WIDTH_160:
3252                 bw = "160Mhz";
3253                 break;
3254         default:
3255                 bw = "BAD BW";
3256         }
3257
3258         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3259                        type, rs_pretty_ant(ant), bw, mcs, nss,
3260                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3261                        (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3262                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3263                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3264                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3265 }
3266
3267 /**
3268  * Program the device to use fixed rate for frame transmit
3269  * This is for debugging/testing only
3270  * once the device start use fixed rate, we need to reload the module
3271  * to being back the normal operation.
3272  */
3273 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3274                                 struct iwl_lq_sta *lq_sta)
3275 {
3276         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3277         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3278         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3279
3280         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3281                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3282
3283         if (lq_sta->pers.dbg_fixed_rate) {
3284                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3285                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3286         }
3287 }
3288
3289 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3290                         const char __user *user_buf, size_t count, loff_t *ppos)
3291 {
3292         struct iwl_lq_sta *lq_sta = file->private_data;
3293         struct iwl_mvm *mvm;
3294         char buf[64];
3295         size_t buf_size;
3296         u32 parsed_rate;
3297
3298         mvm = lq_sta->pers.drv;
3299         memset(buf, 0, sizeof(buf));
3300         buf_size = min(count, sizeof(buf) -  1);
3301         if (copy_from_user(buf, user_buf, buf_size))
3302                 return -EFAULT;
3303
3304         if (sscanf(buf, "%x", &parsed_rate) == 1)
3305                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3306         else
3307                 lq_sta->pers.dbg_fixed_rate = 0;
3308
3309         rs_program_fix_rate(mvm, lq_sta);
3310
3311         return count;
3312 }
3313
3314 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3315                         char __user *user_buf, size_t count, loff_t *ppos)
3316 {
3317         char *buff;
3318         int desc = 0;
3319         int i = 0;
3320         ssize_t ret;
3321
3322         struct iwl_lq_sta *lq_sta = file->private_data;
3323         struct iwl_mvm *mvm;
3324         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3325         struct rs_rate *rate = &tbl->rate;
3326         u32 ss_params;
3327         mvm = lq_sta->pers.drv;
3328         buff = kmalloc(2048, GFP_KERNEL);
3329         if (!buff)
3330                 return -ENOMEM;
3331
3332         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3333         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3334                         lq_sta->total_failed, lq_sta->total_success,
3335                         lq_sta->active_legacy_rate);
3336         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3337                         lq_sta->pers.dbg_fixed_rate);
3338         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3339             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3340             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3341             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3342         desc += sprintf(buff+desc, "lq type %s\n",
3343                         (is_legacy(rate)) ? "legacy" :
3344                         is_vht(rate) ? "VHT" : "HT");
3345         if (!is_legacy(rate)) {
3346                 desc += sprintf(buff + desc, " %s",
3347                    (is_siso(rate)) ? "SISO" : "MIMO2");
3348                 desc += sprintf(buff + desc, " %s",
3349                                 (is_ht20(rate)) ? "20MHz" :
3350                                 (is_ht40(rate)) ? "40MHz" :
3351                                 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3352                 desc += sprintf(buff + desc, " %s %s %s\n",
3353                                 (rate->sgi) ? "SGI" : "NGI",
3354                                 (rate->ldpc) ? "LDPC" : "BCC",
3355                                 (lq_sta->is_agg) ? "AGG on" : "");
3356         }
3357         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3358                         lq_sta->last_rate_n_flags);
3359         desc += sprintf(buff+desc,
3360                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3361                         lq_sta->lq.flags,
3362                         lq_sta->lq.mimo_delim,
3363                         lq_sta->lq.single_stream_ant_msk,
3364                         lq_sta->lq.dual_stream_ant_msk);
3365
3366         desc += sprintf(buff+desc,
3367                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3368                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3369                         lq_sta->lq.agg_disable_start_th,
3370                         lq_sta->lq.agg_frame_cnt_limit);
3371
3372         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3373         ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3374         desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3375                         (ss_params & LQ_SS_PARAMS_VALID) ?
3376                         "VALID" : "INVALID",
3377                         (ss_params & LQ_SS_BFER_ALLOWED) ?
3378                         ", BFER" : "",
3379                         (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3380                         ", STBC" : "",
3381                         (ss_params & LQ_SS_FORCE) ?
3382                         ", FORCE" : "");
3383         desc += sprintf(buff+desc,
3384                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3385                         lq_sta->lq.initial_rate_index[0],
3386                         lq_sta->lq.initial_rate_index[1],
3387                         lq_sta->lq.initial_rate_index[2],
3388                         lq_sta->lq.initial_rate_index[3]);
3389
3390         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3391                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3392
3393                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3394                 desc += rs_pretty_print_rate(buff+desc, r);
3395         }
3396
3397         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3398         kfree(buff);
3399         return ret;
3400 }
3401
3402 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3403         .write = rs_sta_dbgfs_scale_table_write,
3404         .read = rs_sta_dbgfs_scale_table_read,
3405         .open = simple_open,
3406         .llseek = default_llseek,
3407 };
3408 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3409                         char __user *user_buf, size_t count, loff_t *ppos)
3410 {
3411         char *buff;
3412         int desc = 0;
3413         int i, j;
3414         ssize_t ret;
3415         struct iwl_scale_tbl_info *tbl;
3416         struct rs_rate *rate;
3417         struct iwl_lq_sta *lq_sta = file->private_data;
3418
3419         buff = kmalloc(1024, GFP_KERNEL);
3420         if (!buff)
3421                 return -ENOMEM;
3422
3423         for (i = 0; i < LQ_SIZE; i++) {
3424                 tbl = &(lq_sta->lq_info[i]);
3425                 rate = &tbl->rate;
3426                 desc += sprintf(buff+desc,
3427                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3428                                 "index=%d\n",
3429                                 lq_sta->active_tbl == i ? "*" : "x",
3430                                 rate->type,
3431                                 rate->sgi,
3432                                 is_ht20(rate) ? "20Mhz" :
3433                                 is_ht40(rate) ? "40Mhz" :
3434                                 is_ht80(rate) ? "80Mhz" : "ERR",
3435                                 rate->index);
3436                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3437                         desc += sprintf(buff+desc,
3438                                 "counter=%d success=%d %%=%d\n",
3439                                 tbl->win[j].counter,
3440                                 tbl->win[j].success_counter,
3441                                 tbl->win[j].success_ratio);
3442                 }
3443         }
3444         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3445         kfree(buff);
3446         return ret;
3447 }
3448
3449 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3450         .read = rs_sta_dbgfs_stats_table_read,
3451         .open = simple_open,
3452         .llseek = default_llseek,
3453 };
3454
3455 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3456                                               char __user *user_buf,
3457                                               size_t count, loff_t *ppos)
3458 {
3459         static const char * const column_name[] = {
3460                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3461                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3462                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3463                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3464                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3465                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3466                 [RS_COLUMN_MIMO2] = "MIMO2",
3467                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3468         };
3469
3470         static const char * const rate_name[] = {
3471                 [IWL_RATE_1M_INDEX] = "1M",
3472                 [IWL_RATE_2M_INDEX] = "2M",
3473                 [IWL_RATE_5M_INDEX] = "5.5M",
3474                 [IWL_RATE_11M_INDEX] = "11M",
3475                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3476                 [IWL_RATE_9M_INDEX] = "9M",
3477                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3478                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3479                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3480                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3481                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3482                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3483                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3484                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3485                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3486         };
3487
3488         char *buff, *pos, *endpos;
3489         int col, rate;
3490         ssize_t ret;
3491         struct iwl_lq_sta *lq_sta = file->private_data;
3492         struct rs_rate_stats *stats;
3493         static const size_t bufsz = 1024;
3494
3495         buff = kmalloc(bufsz, GFP_KERNEL);
3496         if (!buff)
3497                 return -ENOMEM;
3498
3499         pos = buff;
3500         endpos = pos + bufsz;
3501
3502         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3503         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3504                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3505         pos += scnprintf(pos, endpos - pos, "\n");
3506
3507         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3508                 pos += scnprintf(pos, endpos - pos,
3509                                  "%s,", column_name[col]);
3510
3511                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3512                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3513                         pos += scnprintf(pos, endpos - pos,
3514                                          "%llu/%llu,",
3515                                          stats->success,
3516                                          stats->total);
3517                 }
3518                 pos += scnprintf(pos, endpos - pos, "\n");
3519         }
3520
3521         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3522         kfree(buff);
3523         return ret;
3524 }
3525
3526 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3527                                                const char __user *user_buf,
3528                                                size_t count, loff_t *ppos)
3529 {
3530         struct iwl_lq_sta *lq_sta = file->private_data;
3531         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3532
3533         return count;
3534 }
3535
3536 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3537         .read = rs_sta_dbgfs_drv_tx_stats_read,
3538         .write = rs_sta_dbgfs_drv_tx_stats_write,
3539         .open = simple_open,
3540         .llseek = default_llseek,
3541 };
3542
3543 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3544                                        char __user *user_buf,
3545                                        size_t count, loff_t *ppos)
3546 {
3547         struct iwl_lq_sta *lq_sta = file->private_data;
3548         char buf[12];
3549         int bufsz = sizeof(buf);
3550         int pos = 0;
3551         static const char * const ss_force_name[] = {
3552                 [RS_SS_FORCE_NONE] = "none",
3553                 [RS_SS_FORCE_STBC] = "stbc",
3554                 [RS_SS_FORCE_BFER] = "bfer",
3555                 [RS_SS_FORCE_SISO] = "siso",
3556         };
3557
3558         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3559                          ss_force_name[lq_sta->pers.ss_force]);
3560         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3561 }
3562
3563 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3564                                         size_t count, loff_t *ppos)
3565 {
3566         struct iwl_mvm *mvm = lq_sta->pers.drv;
3567         int ret = 0;
3568
3569         if (!strncmp("none", buf, 4)) {
3570                 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3571         } else if (!strncmp("siso", buf, 4)) {
3572                 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3573         } else if (!strncmp("stbc", buf, 4)) {
3574                 if (lq_sta->stbc_capable) {
3575                         lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3576                 } else {
3577                         IWL_ERR(mvm,
3578                                 "can't force STBC. peer doesn't support\n");
3579                         ret = -EINVAL;
3580                 }
3581         } else if (!strncmp("bfer", buf, 4)) {
3582                 if (lq_sta->bfer_capable) {
3583                         lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3584                 } else {
3585                         IWL_ERR(mvm,
3586                                 "can't force BFER. peer doesn't support\n");
3587                         ret = -EINVAL;
3588                 }
3589         } else {
3590                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3591                 ret = -EINVAL;
3592         }
3593         return ret ?: count;
3594 }
3595
3596 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3597         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3598 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
3599                 if (!debugfs_create_file(#name, mode, parent, lq_sta,   \
3600                                          &iwl_dbgfs_##name##_ops))      \
3601                         goto err;                                       \
3602         } while (0)
3603
3604 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3605
3606 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3607 {
3608         struct iwl_lq_sta *lq_sta = mvm_sta;
3609
3610         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3611                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
3612         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3613                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
3614         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3615                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3616         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3617                           &lq_sta->tx_agg_tid_en);
3618         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3619                           &lq_sta->pers.dbg_fixed_txp_reduction);
3620
3621         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3622         return;
3623 err:
3624         IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3625 }
3626
3627 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3628 {
3629 }
3630 #endif
3631
3632 /*
3633  * Initialization of rate scaling information is done by driver after
3634  * the station is added. Since mac80211 calls this function before a
3635  * station is added we ignore it.
3636  */
3637 static void rs_rate_init_stub(void *mvm_r,
3638                               struct ieee80211_supported_band *sband,
3639                               struct cfg80211_chan_def *chandef,
3640                               struct ieee80211_sta *sta, void *mvm_sta)
3641 {
3642 }
3643
3644 static const struct rate_control_ops rs_mvm_ops = {
3645         .name = RS_NAME,
3646         .tx_status = rs_mac80211_tx_status,
3647         .get_rate = rs_get_rate,
3648         .rate_init = rs_rate_init_stub,
3649         .alloc = rs_alloc,
3650         .free = rs_free,
3651         .alloc_sta = rs_alloc_sta,
3652         .free_sta = rs_free_sta,
3653         .rate_update = rs_rate_update,
3654 #ifdef CONFIG_MAC80211_DEBUGFS
3655         .add_sta_debugfs = rs_add_debugfs,
3656         .remove_sta_debugfs = rs_remove_debugfs,
3657 #endif
3658 };
3659
3660 int iwl_mvm_rate_control_register(void)
3661 {
3662         return ieee80211_rate_control_register(&rs_mvm_ops);
3663 }
3664
3665 void iwl_mvm_rate_control_unregister(void)
3666 {
3667         ieee80211_rate_control_unregister(&rs_mvm_ops);
3668 }
3669
3670 /**
3671  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3672  * Tx protection, according to this rquest and previous requests,
3673  * and send the LQ command.
3674  * @mvmsta: The station
3675  * @enable: Enable Tx protection?
3676  */
3677 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3678                           bool enable)
3679 {
3680         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3681
3682         lockdep_assert_held(&mvm->mutex);
3683
3684         if (enable) {
3685                 if (mvmsta->tx_protection == 0)
3686                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
3687                 mvmsta->tx_protection++;
3688         } else {
3689                 mvmsta->tx_protection--;
3690                 if (mvmsta->tx_protection == 0)
3691                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3692         }
3693
3694         return iwl_mvm_send_lq_cmd(mvm, lq, false);
3695 }