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
  43 #define RS_NAME "iwl-mvm-rs"
  44
  45 #define NUM_TRY_BEFORE_ANT_TOGGLE       1
  46 #define RS_LEGACY_RETRIES_PER_RATE      1
  47 #define RS_HT_VHT_RETRIES_PER_RATE      2
  48 #define RS_HT_VHT_RETRIES_PER_RATE_TW   1
  49 #define RS_INITIAL_MIMO_NUM_RATES       3
  50 #define RS_INITIAL_SISO_NUM_RATES       3
  51 #define RS_INITIAL_LEGACY_NUM_RATES     LINK_QUAL_MAX_RETRY_NUM
  52 #define RS_SECONDARY_LEGACY_NUM_RATES   LINK_QUAL_MAX_RETRY_NUM
  53 #define RS_SECONDARY_SISO_NUM_RATES     3
  54 #define RS_SECONDARY_SISO_RETRIES       1
  55
  56 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  57 #define IWL_RATE_MIN_FAILURE_TH         3       /* min failures to calc tpt */
  58 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  59
  60 /* max allowed rate miss before sync LQ cmd */
  61 #define IWL_MISSED_RATE_MAX             15
  62 #define RS_STAY_IN_COLUMN_TIMEOUT       (5*HZ)
  63 #define RS_IDLE_TIMEOUT                 (5*HZ)
  64
  65 static u8 rs_ht_to_legacy[] = {
  66         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  67         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  68         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  69         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  70         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  71         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  72         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  73         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  74         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  75         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  76 };
  77
  78 static const u8 ant_toggle_lookup[] = {
  79         [ANT_NONE] = ANT_NONE,
  80         [ANT_A] = ANT_B,
  81         [ANT_B] = ANT_C,
  82         [ANT_AB] = ANT_BC,
  83         [ANT_C] = ANT_A,
  84         [ANT_AC] = ANT_AB,
  85         [ANT_BC] = ANT_AC,
  86         [ANT_ABC] = ANT_ABC,
  87 };
  88
  89 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  90         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  91                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  92                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  93                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  94                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  95                                     IWL_RATE_##rp##M_INDEX,           \
  96                                     IWL_RATE_##rn##M_INDEX }
  97
  98 #define IWL_DECLARE_MCS_RATE(s)                                           \
  99         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
 100                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
 101                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
 102                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
 103                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
 104                                        IWL_RATE_INVM_INDEX,               \
 105                                        IWL_RATE_INVM_INDEX }
 106
 107 /*
 108  * Parameter order:
 109  *   rate, ht rate, prev rate, next rate
 110  *
 111  * If there isn't a valid next or previous rate then INV is used which
 112  * maps to IWL_RATE_INVALID
 113  *
 114  */
 115 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 116         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 117         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 118         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 119         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 120         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 121         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 122         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 123         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 124         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 125         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 126         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 127         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 128         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 129         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 130         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 131 };
 132
 133 enum rs_action {
 134         RS_ACTION_STAY = 0,
 135         RS_ACTION_DOWNSCALE = -1,
 136         RS_ACTION_UPSCALE = 1,
 137 };
 138
 139 enum rs_column_mode {
 140         RS_INVALID = 0,
 141         RS_LEGACY,
 142         RS_SISO,
 143         RS_MIMO2,
 144 };
 145
 146 #define MAX_NEXT_COLUMNS 7
 147 #define MAX_COLUMN_CHECKS 3
 148
 149 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 150                                      struct ieee80211_sta *sta,
 151                                      struct iwl_scale_tbl_info *tbl);
 152
 153 struct rs_tx_column {
 154         enum rs_column_mode mode;
 155         u8 ant;
 156         bool sgi;
 157         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 158         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 159 };
 160
 161 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 162                           struct iwl_scale_tbl_info *tbl)
 163 {
 164         if (!sta->ht_cap.ht_supported)
 165                 return false;
 166
 167         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 168                 return false;
 169
 170         if (num_of_ant(mvm->fw->valid_tx_ant) < 2)
 171                 return false;
 172
 173         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 174                 return false;
 175
 176         return true;
 177 }
 178
 179 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 180                           struct iwl_scale_tbl_info *tbl)
 181 {
 182         if (!sta->ht_cap.ht_supported)
 183                 return false;
 184
 185         return true;
 186 }
 187
 188 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 189                          struct iwl_scale_tbl_info *tbl)
 190 {
 191         struct rs_rate *rate = &tbl->rate;
 192         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 193         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 194
 195         if (is_ht20(rate) && (ht_cap->cap &
 196                              IEEE80211_HT_CAP_SGI_20))
 197                 return true;
 198         if (is_ht40(rate) && (ht_cap->cap &
 199                              IEEE80211_HT_CAP_SGI_40))
 200                 return true;
 201         if (is_ht80(rate) && (vht_cap->cap &
 202                              IEEE80211_VHT_CAP_SHORT_GI_80))
 203                 return true;
 204
 205         return false;
 206 }
 207
 208 static const struct rs_tx_column rs_tx_columns[] = {
 209         [RS_COLUMN_LEGACY_ANT_A] = {
 210                 .mode = RS_LEGACY,
 211                 .ant = ANT_A,
 212                 .next_columns = {
 213                         RS_COLUMN_LEGACY_ANT_B,
 214                         RS_COLUMN_SISO_ANT_A,
 215                         RS_COLUMN_MIMO2,
 216                         RS_COLUMN_INVALID,
 217                         RS_COLUMN_INVALID,
 218                         RS_COLUMN_INVALID,
 219                         RS_COLUMN_INVALID,
 220                 },
 221         },
 222         [RS_COLUMN_LEGACY_ANT_B] = {
 223                 .mode = RS_LEGACY,
 224                 .ant = ANT_B,
 225                 .next_columns = {
 226                         RS_COLUMN_LEGACY_ANT_A,
 227                         RS_COLUMN_SISO_ANT_B,
 228                         RS_COLUMN_MIMO2,
 229                         RS_COLUMN_INVALID,
 230                         RS_COLUMN_INVALID,
 231                         RS_COLUMN_INVALID,
 232                         RS_COLUMN_INVALID,
 233                 },
 234         },
 235         [RS_COLUMN_SISO_ANT_A] = {
 236                 .mode = RS_SISO,
 237                 .ant = ANT_A,
 238                 .next_columns = {
 239                         RS_COLUMN_SISO_ANT_B,
 240                         RS_COLUMN_MIMO2,
 241                         RS_COLUMN_SISO_ANT_A_SGI,
 242                         RS_COLUMN_LEGACY_ANT_A,
 243                         RS_COLUMN_LEGACY_ANT_B,
 244                         RS_COLUMN_INVALID,
 245                         RS_COLUMN_INVALID,
 246                 },
 247                 .checks = {
 248                         rs_siso_allow,
 249                 },
 250         },
 251         [RS_COLUMN_SISO_ANT_B] = {
 252                 .mode = RS_SISO,
 253                 .ant = ANT_B,
 254                 .next_columns = {
 255                         RS_COLUMN_SISO_ANT_A,
 256                         RS_COLUMN_MIMO2,
 257                         RS_COLUMN_SISO_ANT_B_SGI,
 258                         RS_COLUMN_LEGACY_ANT_A,
 259                         RS_COLUMN_LEGACY_ANT_B,
 260                         RS_COLUMN_INVALID,
 261                         RS_COLUMN_INVALID,
 262                 },
 263                 .checks = {
 264                         rs_siso_allow,
 265                 },
 266         },
 267         [RS_COLUMN_SISO_ANT_A_SGI] = {
 268                 .mode = RS_SISO,
 269                 .ant = ANT_A,
 270                 .sgi = true,
 271                 .next_columns = {
 272                         RS_COLUMN_SISO_ANT_B_SGI,
 273                         RS_COLUMN_MIMO2_SGI,
 274                         RS_COLUMN_SISO_ANT_A,
 275                         RS_COLUMN_LEGACY_ANT_A,
 276                         RS_COLUMN_LEGACY_ANT_B,
 277                         RS_COLUMN_INVALID,
 278                         RS_COLUMN_INVALID,
 279                 },
 280                 .checks = {
 281                         rs_siso_allow,
 282                         rs_sgi_allow,
 283                 },
 284         },
 285         [RS_COLUMN_SISO_ANT_B_SGI] = {
 286                 .mode = RS_SISO,
 287                 .ant = ANT_B,
 288                 .sgi = true,
 289                 .next_columns = {
 290                         RS_COLUMN_SISO_ANT_A_SGI,
 291                         RS_COLUMN_MIMO2_SGI,
 292                         RS_COLUMN_SISO_ANT_B,
 293                         RS_COLUMN_LEGACY_ANT_A,
 294                         RS_COLUMN_LEGACY_ANT_B,
 295                         RS_COLUMN_INVALID,
 296                         RS_COLUMN_INVALID,
 297                 },
 298                 .checks = {
 299                         rs_siso_allow,
 300                         rs_sgi_allow,
 301                 },
 302         },
 303         [RS_COLUMN_MIMO2] = {
 304                 .mode = RS_MIMO2,
 305                 .ant = ANT_AB,
 306                 .next_columns = {
 307                         RS_COLUMN_SISO_ANT_A,
 308                         RS_COLUMN_MIMO2_SGI,
 309                         RS_COLUMN_LEGACY_ANT_A,
 310                         RS_COLUMN_LEGACY_ANT_B,
 311                         RS_COLUMN_INVALID,
 312                         RS_COLUMN_INVALID,
 313                         RS_COLUMN_INVALID,
 314                 },
 315                 .checks = {
 316                         rs_mimo_allow,
 317                 },
 318         },
 319         [RS_COLUMN_MIMO2_SGI] = {
 320                 .mode = RS_MIMO2,
 321                 .ant = ANT_AB,
 322                 .sgi = true,
 323                 .next_columns = {
 324                         RS_COLUMN_SISO_ANT_A_SGI,
 325                         RS_COLUMN_MIMO2,
 326                         RS_COLUMN_LEGACY_ANT_A,
 327                         RS_COLUMN_LEGACY_ANT_B,
 328                         RS_COLUMN_INVALID,
 329                         RS_COLUMN_INVALID,
 330                         RS_COLUMN_INVALID,
 331                 },
 332                 .checks = {
 333                         rs_mimo_allow,
 334                         rs_sgi_allow,
 335                 },
 336         },
 337 };
 338
 339 static inline u8 rs_extract_rate(u32 rate_n_flags)
 340 {
 341         /* also works for HT because bits 7:6 are zero there */
 342         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 343 }
 344
 345 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 346 {
 347         int idx = 0;
 348
 349         if (rate_n_flags & RATE_MCS_HT_MSK) {
 350                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 351                 idx += IWL_RATE_MCS_0_INDEX;
 352
 353                 /* skip 9M not supported in HT*/
 354                 if (idx >= IWL_RATE_9M_INDEX)
 355                         idx += 1;
 356                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 357                         return idx;
 358         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 359                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 360                 idx += IWL_RATE_MCS_0_INDEX;
 361
 362                 /* skip 9M not supported in VHT*/
 363                 if (idx >= IWL_RATE_9M_INDEX)
 364                         idx++;
 365                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 366                         return idx;
 367         } else {
 368                 /* legacy rate format, search for match in table */
 369
 370                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 371                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 372                         if (iwl_rates[idx].plcp == legacy_rate)
 373                                 return idx;
 374         }
 375
 376         return IWL_RATE_INVALID;
 377 }
 378
 379 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 380                                   struct ieee80211_sta *sta,
 381                                   struct iwl_lq_sta *lq_sta,
 382                                   int tid);
 383 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 384                            struct ieee80211_sta *sta,
 385                            struct iwl_lq_sta *lq_sta,
 386                            const struct rs_rate *initial_rate);
 387 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 388
 389 /**
 390  * The following tables contain the expected throughput metrics for all rates
 391  *
 392  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 393  *
 394  * where invalid entries are zeros.
 395  *
 396  * CCK rates are only valid in legacy table and will only be used in G
 397  * (2.4 GHz) band.
 398  */
 399
 400 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 401         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 402 };
 403
 404 /* Expected TpT tables. 4 indexes:
 405  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 406  */
 407 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 408         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 409         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 410         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 411         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 412 };
 413
 414 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 415         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 416         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 417         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 418         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 419 };
 420
 421 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 422         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 423         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 424         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 425         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 426 };
 427
 428 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 429         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 430         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 431         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 432         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 433 };
 434
 435 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 436         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 437         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 438         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 439         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 440 };
 441
 442 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 443         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 444         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 445         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 446         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 447 };
 448
 449 /* mbps, mcs */
 450 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 451         {  "1", "BPSK DSSS"},
 452         {  "2", "QPSK DSSS"},
 453         {"5.5", "BPSK CCK"},
 454         { "11", "QPSK CCK"},
 455         {  "6", "BPSK 1/2"},
 456         {  "9", "BPSK 1/2"},
 457         { "12", "QPSK 1/2"},
 458         { "18", "QPSK 3/4"},
 459         { "24", "16QAM 1/2"},
 460         { "36", "16QAM 3/4"},
 461         { "48", "64QAM 2/3"},
 462         { "54", "64QAM 3/4"},
 463         { "60", "64QAM 5/6"},
 464 };
 465
 466 #define MCS_INDEX_PER_STREAM    (8)
 467
 468 static const char *rs_pretty_ant(u8 ant)
 469 {
 470         static const char * const ant_name[] = {
 471                 [ANT_NONE] = "None",
 472                 [ANT_A]    = "A",
 473                 [ANT_B]    = "B",
 474                 [ANT_AB]   = "AB",
 475                 [ANT_C]    = "C",
 476                 [ANT_AC]   = "AC",
 477                 [ANT_BC]   = "BC",
 478                 [ANT_ABC]  = "ABC",
 479         };
 480
 481         if (ant > ANT_ABC)
 482                 return "UNKNOWN";
 483
 484         return ant_name[ant];
 485 }
 486
 487 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 488 {
 489         static const char * const lq_types[] = {
 490                 [LQ_NONE] = "NONE",
 491                 [LQ_LEGACY_A] = "LEGACY_A",
 492                 [LQ_LEGACY_G] = "LEGACY_G",
 493                 [LQ_HT_SISO] = "HT SISO",
 494                 [LQ_HT_MIMO2] = "HT MIMO",
 495                 [LQ_VHT_SISO] = "VHT SISO",
 496                 [LQ_VHT_MIMO2] = "VHT MIMO",
 497         };
 498
 499         if (type < LQ_NONE || type >= LQ_MAX)
 500                 return "UNKNOWN";
 501
 502         return lq_types[type];
 503 }
 504
 505 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 506                                 const char *prefix)
 507 {
 508         IWL_DEBUG_RATE(mvm, "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d\n",
 509                        prefix, rs_pretty_lq_type(rate->type),
 510                        rate->index, rs_pretty_ant(rate->ant),
 511                        rate->bw, rate->sgi, rate->ldpc);
 512 }
 513
 514 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 515 {
 516         window->data = 0;
 517         window->success_counter = 0;
 518         window->success_ratio = IWL_INVALID_VALUE;
 519         window->counter = 0;
 520         window->average_tpt = IWL_INVALID_VALUE;
 521 }
 522
 523 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 524                                             struct iwl_scale_tbl_info *tbl)
 525 {
 526         int i;
 527
 528         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 529         for (i = 0; i < IWL_RATE_COUNT; i++)
 530                 rs_rate_scale_clear_window(&tbl->win[i]);
 531
 532         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 533                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 534 }
 535
 536 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 537 {
 538         return (ant_type & valid_antenna) == ant_type;
 539 }
 540
 541 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 542                                       struct iwl_lq_sta *lq_data, u8 tid,
 543                                       struct ieee80211_sta *sta)
 544 {
 545         int ret = -EAGAIN;
 546
 547         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 548                      sta->addr, tid);
 549         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 550         if (ret == -EAGAIN) {
 551                 /*
 552                  * driver and mac80211 is out of sync
 553                  * this might be cause by reloading firmware
 554                  * stop the tx ba session here
 555                  */
 556                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 557                         tid);
 558                 ieee80211_stop_tx_ba_session(sta, tid);
 559         }
 560         return ret;
 561 }
 562
 563 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 564                               struct iwl_lq_sta *lq_data,
 565                               struct ieee80211_sta *sta)
 566 {
 567         if (tid < IWL_MAX_TID_COUNT)
 568                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 569         else
 570                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 571                         tid, IWL_MAX_TID_COUNT);
 572 }
 573
 574 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 575 {
 576         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 577                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 578                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 579 }
 580
 581 /*
 582  * Static function to get the expected throughput from an iwl_scale_tbl_info
 583  * that wraps a NULL pointer check
 584  */
 585 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 586 {
 587         if (tbl->expected_tpt)
 588                 return tbl->expected_tpt[rs_index];
 589         return 0;
 590 }
 591
 592 /**
 593  * rs_collect_tx_data - Update the success/failure sliding window
 594  *
 595  * We keep a sliding window of the last 62 packets transmitted
 596  * at this rate.  window->data contains the bitmask of successful
 597  * packets.
 598  */
 599 static int _rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 600                                int scale_index, int attempts, int successes,
 601                                struct iwl_rate_scale_data *window)
 602 {
 603         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 604         s32 fail_count, tpt;
 605
 606         /* Get expected throughput */
 607         tpt = get_expected_tpt(tbl, scale_index);
 608
 609         /*
 610          * Keep track of only the latest 62 tx frame attempts in this rate's
 611          * history window; anything older isn't really relevant any more.
 612          * If we have filled up the sliding window, drop the oldest attempt;
 613          * if the oldest attempt (highest bit in bitmap) shows "success",
 614          * subtract "1" from the success counter (this is the main reason
 615          * we keep these bitmaps!).
 616          */
 617         while (attempts > 0) {
 618                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 619                         /* remove earliest */
 620                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 621
 622                         if (window->data & mask) {
 623                                 window->data &= ~mask;
 624                                 window->success_counter--;
 625                         }
 626                 }
 627
 628                 /* Increment frames-attempted counter */
 629                 window->counter++;
 630
 631                 /* Shift bitmap by one frame to throw away oldest history */
 632                 window->data <<= 1;
 633
 634                 /* Mark the most recent #successes attempts as successful */
 635                 if (successes > 0) {
 636                         window->success_counter++;
 637                         window->data |= 0x1;
 638                         successes--;
 639                 }
 640
 641                 attempts--;
 642         }
 643
 644         /* Calculate current success ratio, avoid divide-by-0! */
 645         if (window->counter > 0)
 646                 window->success_ratio = 128 * (100 * window->success_counter)
 647                                         / window->counter;
 648         else
 649                 window->success_ratio = IWL_INVALID_VALUE;
 650
 651         fail_count = window->counter - window->success_counter;
 652
 653         /* Calculate average throughput, if we have enough history. */
 654         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 655             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 656                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 657         else
 658                 window->average_tpt = IWL_INVALID_VALUE;
 659
 660         return 0;
 661 }
 662
 663 static int rs_collect_tx_data(struct iwl_lq_sta *lq_sta,
 664                               struct iwl_scale_tbl_info *tbl,
 665                               int scale_index, int attempts, int successes,
 666                               u8 reduced_txp)
 667 {
 668         struct iwl_rate_scale_data *window = NULL;
 669         int ret;
 670
 671         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 672                 return -EINVAL;
 673
 674         if (tbl->column != RS_COLUMN_INVALID) {
 675                 struct lq_sta_pers *pers = &lq_sta->pers;
 676
 677                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 678                 pers->tx_stats[tbl->column][scale_index].success += successes;
 679         }
 680
 681         /* Select window for current tx bit rate */
 682         window = &(tbl->win[scale_index]);
 683
 684         ret = _rs_collect_tx_data(tbl, scale_index, attempts, successes,
 685                                   window);
 686         if (ret)
 687                 return ret;
 688
 689         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 690                 return -EINVAL;
 691
 692         window = &tbl->tpc_win[reduced_txp];
 693         return _rs_collect_tx_data(tbl, scale_index, attempts, successes,
 694                                    window);
 695 }
 696
 697 /* Convert rs_rate object into ucode rate bitmask */
 698 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 699                                   struct rs_rate *rate)
 700 {
 701         u32 ucode_rate = 0;
 702         int index = rate->index;
 703
 704         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 705                          RATE_MCS_ANT_ABC_MSK);
 706
 707         if (is_legacy(rate)) {
 708                 ucode_rate |= iwl_rates[index].plcp;
 709                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 710                         ucode_rate |= RATE_MCS_CCK_MSK;
 711                 return ucode_rate;
 712         }
 713
 714         if (is_ht(rate)) {
 715                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 716                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 717                         index = IWL_LAST_HT_RATE;
 718                 }
 719                 ucode_rate |= RATE_MCS_HT_MSK;
 720
 721                 if (is_ht_siso(rate))
 722                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 723                 else if (is_ht_mimo2(rate))
 724                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 725                 else
 726                         WARN_ON_ONCE(1);
 727         } else if (is_vht(rate)) {
 728                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 729                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 730                         index = IWL_LAST_VHT_RATE;
 731                 }
 732                 ucode_rate |= RATE_MCS_VHT_MSK;
 733                 if (is_vht_siso(rate))
 734                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 735                 else if (is_vht_mimo2(rate))
 736                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 737                 else
 738                         WARN_ON_ONCE(1);
 739
 740         } else {
 741                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 742         }
 743
 744         ucode_rate |= rate->bw;
 745         if (rate->sgi)
 746                 ucode_rate |= RATE_MCS_SGI_MSK;
 747         if (rate->ldpc)
 748                 ucode_rate |= RATE_MCS_LDPC_MSK;
 749
 750         return ucode_rate;
 751 }
 752
 753 /* Convert a ucode rate into an rs_rate object */
 754 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 755                                    enum ieee80211_band band,
 756                                    struct rs_rate *rate)
 757 {
 758         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 759         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 760         u8 nss;
 761
 762         memset(rate, 0, sizeof(*rate));
 763         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 764
 765         if (rate->index == IWL_RATE_INVALID)
 766                 return -EINVAL;
 767
 768         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 769
 770         /* Legacy */
 771         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 772             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 773                 if (num_of_ant == 1) {
 774                         if (band == IEEE80211_BAND_5GHZ)
 775                                 rate->type = LQ_LEGACY_A;
 776                         else
 777                                 rate->type = LQ_LEGACY_G;
 778                 }
 779
 780                 return 0;
 781         }
 782
 783         /* HT or VHT */
 784         if (ucode_rate & RATE_MCS_SGI_MSK)
 785                 rate->sgi = true;
 786         if (ucode_rate & RATE_MCS_LDPC_MSK)
 787                 rate->ldpc = true;
 788
 789         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 790
 791         if (ucode_rate & RATE_MCS_HT_MSK) {
 792                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 793                        RATE_HT_MCS_NSS_POS) + 1;
 794
 795                 if (nss == 1) {
 796                         rate->type = LQ_HT_SISO;
 797                         WARN_ON_ONCE(num_of_ant != 1);
 798                 } else if (nss == 2) {
 799                         rate->type = LQ_HT_MIMO2;
 800                         WARN_ON_ONCE(num_of_ant != 2);
 801                 } else {
 802                         WARN_ON_ONCE(1);
 803                 }
 804         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 805                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 806                        RATE_VHT_MCS_NSS_POS) + 1;
 807
 808                 if (nss == 1) {
 809                         rate->type = LQ_VHT_SISO;
 810                         WARN_ON_ONCE(num_of_ant != 1);
 811                 } else if (nss == 2) {
 812                         rate->type = LQ_VHT_MIMO2;
 813                         WARN_ON_ONCE(num_of_ant != 2);
 814                 } else {
 815                         WARN_ON_ONCE(1);
 816                 }
 817         }
 818
 819         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
 820         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 821                      !is_vht(rate));
 822
 823         return 0;
 824 }
 825
 826 /* switch to another antenna/antennas and return 1 */
 827 /* if no other valid antenna found, return 0 */
 828 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 829 {
 830         u8 new_ant_type;
 831
 832         if (!rate->ant || rate->ant > ANT_ABC)
 833                 return 0;
 834
 835         if (!rs_is_valid_ant(valid_ant, rate->ant))
 836                 return 0;
 837
 838         new_ant_type = ant_toggle_lookup[rate->ant];
 839
 840         while ((new_ant_type != rate->ant) &&
 841                !rs_is_valid_ant(valid_ant, new_ant_type))
 842                 new_ant_type = ant_toggle_lookup[new_ant_type];
 843
 844         if (new_ant_type == rate->ant)
 845                 return 0;
 846
 847         rate->ant = new_ant_type;
 848
 849         return 1;
 850 }
 851
 852 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 853                                   struct rs_rate *rate)
 854 {
 855         if (is_legacy(rate))
 856                 return lq_sta->active_legacy_rate;
 857         else if (is_siso(rate))
 858                 return lq_sta->active_siso_rate;
 859         else if (is_mimo2(rate))
 860                 return lq_sta->active_mimo2_rate;
 861
 862         WARN_ON_ONCE(1);
 863         return 0;
 864 }
 865
 866 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 867                                 int rate_type)
 868 {
 869         u8 high = IWL_RATE_INVALID;
 870         u8 low = IWL_RATE_INVALID;
 871
 872         /* 802.11A or ht walks to the next literal adjacent rate in
 873          * the rate table */
 874         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 875                 int i;
 876                 u32 mask;
 877
 878                 /* Find the previous rate that is in the rate mask */
 879                 i = index - 1;
 880                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 881                         if (rate_mask & mask) {
 882                                 low = i;
 883                                 break;
 884                         }
 885                 }
 886
 887                 /* Find the next rate that is in the rate mask */
 888                 i = index + 1;
 889                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 890                         if (rate_mask & mask) {
 891                                 high = i;
 892                                 break;
 893                         }
 894                 }
 895
 896                 return (high << 8) | low;
 897         }
 898
 899         low = index;
 900         while (low != IWL_RATE_INVALID) {
 901                 low = iwl_rates[low].prev_rs;
 902                 if (low == IWL_RATE_INVALID)
 903                         break;
 904                 if (rate_mask & (1 << low))
 905                         break;
 906                 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
 907         }
 908
 909         high = index;
 910         while (high != IWL_RATE_INVALID) {
 911                 high = iwl_rates[high].next_rs;
 912                 if (high == IWL_RATE_INVALID)
 913                         break;
 914                 if (rate_mask & (1 << high))
 915                         break;
 916                 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
 917         }
 918
 919         return (high << 8) | low;
 920 }
 921
 922 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
 923                                      struct rs_rate *rate)
 924 {
 925         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
 926 }
 927
 928 /* Get the next supported lower rate in the current column.
 929  * Return true if bottom rate in the current column was reached
 930  */
 931 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
 932                                         struct rs_rate *rate)
 933 {
 934         u8 low;
 935         u16 high_low;
 936         u16 rate_mask;
 937         struct iwl_mvm *mvm = lq_sta->pers.drv;
 938
 939         rate_mask = rs_get_supported_rates(lq_sta, rate);
 940         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
 941                                         rate->type);
 942         low = high_low & 0xff;
 943
 944         /* Bottom rate of column reached */
 945         if (low == IWL_RATE_INVALID)
 946                 return true;
 947
 948         rate->index = low;
 949         return false;
 950 }
 951
 952 /* Get the next rate to use following a column downgrade */
 953 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
 954                                           struct rs_rate *rate)
 955 {
 956         struct iwl_mvm *mvm = lq_sta->pers.drv;
 957
 958         if (is_legacy(rate)) {
 959                 /* No column to downgrade from Legacy */
 960                 return;
 961         } else if (is_siso(rate)) {
 962                 /* Downgrade to Legacy if we were in SISO */
 963                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 964                         rate->type = LQ_LEGACY_A;
 965                 else
 966                         rate->type = LQ_LEGACY_G;
 967
 968                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
 969
 970                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
 971                              rate->index > IWL_RATE_MCS_9_INDEX);
 972
 973                 rate->index = rs_ht_to_legacy[rate->index];
 974                 rate->ldpc = false;
 975         } else {
 976                 /* Downgrade to SISO with same MCS if in MIMO  */
 977                 rate->type = is_vht_mimo2(rate) ?
 978                         LQ_VHT_SISO : LQ_HT_SISO;
 979         }
 980
 981         if (num_of_ant(rate->ant) > 1)
 982                 rate->ant = first_antenna(mvm->fw->valid_tx_ant);
 983
 984         /* Relevant in both switching to SISO or Legacy */
 985         rate->sgi = false;
 986
 987         if (!rs_rate_supported(lq_sta, rate))
 988                 rs_get_lower_rate_in_column(lq_sta, rate);
 989 }
 990
 991 /* Simple function to compare two rate scale table types */
 992 static inline bool rs_rate_match(struct rs_rate *a,
 993                                  struct rs_rate *b)
 994 {
 995         return (a->type == b->type) && (a->ant == b->ant) && (a->sgi == b->sgi);
 996 }
 997
 998 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
 999 {
1000         if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
1001                 return RATE_MCS_CHAN_WIDTH_40;
1002         else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
1003                 return RATE_MCS_CHAN_WIDTH_80;
1004         else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
1005                 return RATE_MCS_CHAN_WIDTH_160;
1006
1007         return RATE_MCS_CHAN_WIDTH_20;
1008 }
1009
1010 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1011 {
1012         u8 tid = IWL_MAX_TID_COUNT;
1013
1014         if (ieee80211_is_data_qos(hdr->frame_control)) {
1015                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1016                 tid = qc[0] & 0xf;
1017         }
1018
1019         if (unlikely(tid > IWL_MAX_TID_COUNT))
1020                 tid = IWL_MAX_TID_COUNT;
1021
1022         return tid;
1023 }
1024
1025 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1026                           int tid, struct ieee80211_tx_info *info)
1027 {
1028         int legacy_success;
1029         int retries;
1030         int mac_index, i;
1031         struct iwl_lq_cmd *table;
1032         enum mac80211_rate_control_flags mac_flags;
1033         u32 ucode_rate;
1034         struct rs_rate rate;
1035         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1036         u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1037         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1038         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1039
1040         /* Treat uninitialized rate scaling data same as non-existing. */
1041         if (!lq_sta) {
1042                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1043                 return;
1044         } else if (!lq_sta->pers.drv) {
1045                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1046                 return;
1047         }
1048
1049 #ifdef CONFIG_MAC80211_DEBUGFS
1050         /* Disable last tx check if we are debugging with fixed rate */
1051         if (lq_sta->pers.dbg_fixed_rate) {
1052                 IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n");
1053                 return;
1054         }
1055 #endif
1056         /* This packet was aggregated but doesn't carry status info */
1057         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1058             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1059                 return;
1060
1061         /*
1062          * Ignore this Tx frame response if its initial rate doesn't match
1063          * that of latest Link Quality command.  There may be stragglers
1064          * from a previous Link Quality command, but we're no longer interested
1065          * in those; they're either from the "active" mode while we're trying
1066          * to check "search" mode, or a prior "search" mode after we've moved
1067          * to a new "search" mode (which might become the new "active" mode).
1068          */
1069         table = &lq_sta->lq;
1070         ucode_rate = le32_to_cpu(table->rs_table[0]);
1071         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1072         if (info->band == IEEE80211_BAND_5GHZ)
1073                 rate.index -= IWL_FIRST_OFDM_RATE;
1074         mac_flags = info->status.rates[0].flags;
1075         mac_index = info->status.rates[0].idx;
1076         /* For HT packets, map MCS to PLCP */
1077         if (mac_flags & IEEE80211_TX_RC_MCS) {
1078                 /* Remove # of streams */
1079                 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1080                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1081                         mac_index++;
1082                 /*
1083                  * mac80211 HT index is always zero-indexed; we need to move
1084                  * HT OFDM rates after CCK rates in 2.4 GHz band
1085                  */
1086                 if (info->band == IEEE80211_BAND_2GHZ)
1087                         mac_index += IWL_FIRST_OFDM_RATE;
1088         } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1089                 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1090                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1091                         mac_index++;
1092         }
1093
1094         if (time_after(jiffies,
1095                        (unsigned long)(lq_sta->last_tx + RS_IDLE_TIMEOUT))) {
1096                 int tid;
1097                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1098                 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
1099                         ieee80211_stop_tx_ba_session(sta, tid);
1100
1101                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1102                 return;
1103         }
1104         lq_sta->last_tx = jiffies;
1105
1106         /* Here we actually compare this rate to the latest LQ command */
1107         if ((mac_index < 0) ||
1108             (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1109             (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1110             (rate.ant != info->status.antenna) ||
1111             (!!(ucode_rate & RATE_MCS_HT_MSK) !=
1112              !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
1113             (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
1114              !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
1115             (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
1116              !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
1117             (rate.index != mac_index)) {
1118                 IWL_DEBUG_RATE(mvm,
1119                                "initial rate %d does not match %d (0x%x)\n",
1120                                mac_index, rate.index, ucode_rate);
1121                 /*
1122                  * Since rates mis-match, the last LQ command may have failed.
1123                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1124                  * ... driver.
1125                  */
1126                 lq_sta->missed_rate_counter++;
1127                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
1128                         lq_sta->missed_rate_counter = 0;
1129                         IWL_DEBUG_RATE(mvm,
1130                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1131                                        lq_sta->rs_state);
1132                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1133                 }
1134                 /* Regardless, ignore this status info for outdated rate */
1135                 return;
1136         } else
1137                 /* Rate did match, so reset the missed_rate_counter */
1138                 lq_sta->missed_rate_counter = 0;
1139
1140         /* Figure out if rate scale algorithm is in active or search table */
1141         if (rs_rate_match(&rate,
1142                           &(lq_sta->lq_info[lq_sta->active_tbl].rate))) {
1143                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1144                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1145         } else if (rs_rate_match(&rate,
1146                          &lq_sta->lq_info[1 - lq_sta->active_tbl].rate)) {
1147                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1148                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1149         } else {
1150                 IWL_DEBUG_RATE(mvm,
1151                                "Neither active nor search matches tx rate\n");
1152                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1153                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1154                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1155                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1156                 rs_dump_rate(mvm, &rate, "ACTUAL");
1157
1158                 /*
1159                  * no matching table found, let's by-pass the data collection
1160                  * and continue to perform rate scale to find the rate table
1161                  */
1162                 rs_stay_in_table(lq_sta, true);
1163                 goto done;
1164         }
1165
1166         /*
1167          * Updating the frame history depends on whether packets were
1168          * aggregated.
1169          *
1170          * For aggregation, all packets were transmitted at the same rate, the
1171          * first index into rate scale table.
1172          */
1173         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1174                 ucode_rate = le32_to_cpu(table->rs_table[0]);
1175                 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1176                 rs_collect_tx_data(lq_sta, curr_tbl, rate.index,
1177                                    info->status.ampdu_len,
1178                                    info->status.ampdu_ack_len,
1179                                    reduced_txp);
1180
1181                 /* Update success/fail counts if not searching for new mode */
1182                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1183                         lq_sta->total_success += info->status.ampdu_ack_len;
1184                         lq_sta->total_failed += (info->status.ampdu_len -
1185                                         info->status.ampdu_ack_len);
1186                 }
1187         } else {
1188         /*
1189          * For legacy, update frame history with for each Tx retry.
1190          */
1191                 retries = info->status.rates[0].count - 1;
1192                 /* HW doesn't send more than 15 retries */
1193                 retries = min(retries, 15);
1194
1195                 /* The last transmission may have been successful */
1196                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1197                 /* Collect data for each rate used during failed TX attempts */
1198                 for (i = 0; i <= retries; ++i) {
1199                         ucode_rate = le32_to_cpu(table->rs_table[i]);
1200                         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1201                         /*
1202                          * Only collect stats if retried rate is in the same RS
1203                          * table as active/search.
1204                          */
1205                         if (rs_rate_match(&rate, &curr_tbl->rate))
1206                                 tmp_tbl = curr_tbl;
1207                         else if (rs_rate_match(&rate, &other_tbl->rate))
1208                                 tmp_tbl = other_tbl;
1209                         else
1210                                 continue;
1211
1212                         rs_collect_tx_data(lq_sta, tmp_tbl, rate.index, 1,
1213                                            i < retries ? 0 : legacy_success,
1214                                            reduced_txp);
1215                 }
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 += legacy_success;
1220                         lq_sta->total_failed += retries + (1 - legacy_success);
1221                 }
1222         }
1223         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1224         lq_sta->last_rate_n_flags = ucode_rate;
1225         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1226 done:
1227         /* See if there's a better rate or modulation mode to try. */
1228         if (sta && sta->supp_rates[info->band])
1229                 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1230 }
1231
1232 /*
1233  * mac80211 sends us Tx status
1234  */
1235 static void rs_mac80211_tx_status(void *mvm_r,
1236                                   struct ieee80211_supported_band *sband,
1237                                   struct ieee80211_sta *sta, void *priv_sta,
1238                                   struct sk_buff *skb)
1239 {
1240         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1241         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1242         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1243         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1244
1245         if (!ieee80211_is_data(hdr->frame_control) ||
1246             info->flags & IEEE80211_TX_CTL_NO_ACK)
1247                 return;
1248
1249         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1250 }
1251
1252 /*
1253  * Begin a period of staying with a selected modulation mode.
1254  * Set "stay_in_tbl" flag to prevent any mode switches.
1255  * Set frame tx success limits according to legacy vs. high-throughput,
1256  * and reset overall (spanning all rates) tx success history statistics.
1257  * These control how long we stay using same modulation mode before
1258  * searching for a new mode.
1259  */
1260 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1261                                  struct iwl_lq_sta *lq_sta)
1262 {
1263         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1264         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1265         if (is_legacy) {
1266                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1267                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1268                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1269         } else {
1270                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1271                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1272                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1273         }
1274         lq_sta->table_count = 0;
1275         lq_sta->total_failed = 0;
1276         lq_sta->total_success = 0;
1277         lq_sta->flush_timer = jiffies;
1278         lq_sta->visited_columns = 0;
1279 }
1280
1281 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1282                                    const struct rs_tx_column *column)
1283 {
1284         switch (column->mode) {
1285         case RS_LEGACY:
1286                 return lq_sta->max_legacy_rate_idx;
1287         case RS_SISO:
1288                 return lq_sta->max_siso_rate_idx;
1289         case RS_MIMO2:
1290                 return lq_sta->max_mimo2_rate_idx;
1291         default:
1292                 WARN_ON_ONCE(1);
1293         }
1294
1295         return lq_sta->max_legacy_rate_idx;
1296 }
1297
1298 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1299                                             const struct rs_tx_column *column,
1300                                             u32 bw)
1301 {
1302         /* Used to choose among HT tables */
1303         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1304
1305         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1306                          column->mode != RS_SISO &&
1307                          column->mode != RS_MIMO2))
1308                 return expected_tpt_legacy;
1309
1310         /* Legacy rates have only one table */
1311         if (column->mode == RS_LEGACY)
1312                 return expected_tpt_legacy;
1313
1314         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1315         /* Choose among many HT tables depending on number of streams
1316          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1317          * status */
1318         if (column->mode == RS_SISO) {
1319                 switch (bw) {
1320                 case RATE_MCS_CHAN_WIDTH_20:
1321                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1322                         break;
1323                 case RATE_MCS_CHAN_WIDTH_40:
1324                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1325                         break;
1326                 case RATE_MCS_CHAN_WIDTH_80:
1327                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1328                         break;
1329                 default:
1330                         WARN_ON_ONCE(1);
1331                 }
1332         } else if (column->mode == RS_MIMO2) {
1333                 switch (bw) {
1334                 case RATE_MCS_CHAN_WIDTH_20:
1335                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1336                         break;
1337                 case RATE_MCS_CHAN_WIDTH_40:
1338                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1339                         break;
1340                 case RATE_MCS_CHAN_WIDTH_80:
1341                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1342                         break;
1343                 default:
1344                         WARN_ON_ONCE(1);
1345                 }
1346         } else {
1347                 WARN_ON_ONCE(1);
1348         }
1349
1350         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1351                 return ht_tbl_pointer[0];
1352         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1353                 return ht_tbl_pointer[1];
1354         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1355                 return ht_tbl_pointer[2];
1356         else                                            /* AGG+SGI */
1357                 return ht_tbl_pointer[3];
1358 }
1359
1360 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1361                                       struct iwl_scale_tbl_info *tbl)
1362 {
1363         struct rs_rate *rate = &tbl->rate;
1364         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1365
1366         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1367 }
1368
1369 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1370                             struct iwl_lq_sta *lq_sta,
1371                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1372                             unsigned long rate_mask, s8 index)
1373 {
1374         struct iwl_scale_tbl_info *active_tbl =
1375             &(lq_sta->lq_info[lq_sta->active_tbl]);
1376         s32 success_ratio = active_tbl->win[index].success_ratio;
1377         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1378         const u16 *tpt_tbl = tbl->expected_tpt;
1379         u16 high_low;
1380         u32 target_tpt;
1381         int rate_idx;
1382
1383         if (success_ratio > RS_SR_NO_DECREASE) {
1384                 target_tpt = 100 * expected_current_tpt;
1385                 IWL_DEBUG_RATE(mvm,
1386                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1387                                success_ratio, target_tpt);
1388         } else {
1389                 target_tpt = lq_sta->last_tpt;
1390                 IWL_DEBUG_RATE(mvm,
1391                                "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1392                                success_ratio, target_tpt);
1393         }
1394
1395         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1396
1397         while (rate_idx != IWL_RATE_INVALID) {
1398                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1399                         break;
1400
1401                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1402                                                 tbl->rate.type);
1403
1404                 rate_idx = (high_low >> 8) & 0xff;
1405         }
1406
1407         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1408                        rate_idx, target_tpt,
1409                        rate_idx != IWL_RATE_INVALID ?
1410                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1411
1412         return rate_idx;
1413 }
1414
1415 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1416 {
1417         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1418                 return RATE_MCS_CHAN_WIDTH_80;
1419         else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1420                 return RATE_MCS_CHAN_WIDTH_40;
1421
1422         return RATE_MCS_CHAN_WIDTH_20;
1423 }
1424
1425 /*
1426  * Check whether we should continue using same modulation mode, or
1427  * begin search for a new mode, based on:
1428  * 1) # tx successes or failures while using this mode
1429  * 2) # times calling this function
1430  * 3) elapsed time in this mode (not used, for now)
1431  */
1432 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1433 {
1434         struct iwl_scale_tbl_info *tbl;
1435         int active_tbl;
1436         int flush_interval_passed = 0;
1437         struct iwl_mvm *mvm;
1438
1439         mvm = lq_sta->pers.drv;
1440         active_tbl = lq_sta->active_tbl;
1441
1442         tbl = &(lq_sta->lq_info[active_tbl]);
1443
1444         /* If we've been disallowing search, see if we should now allow it */
1445         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1446                 /* Elapsed time using current modulation mode */
1447                 if (lq_sta->flush_timer)
1448                         flush_interval_passed =
1449                                 time_after(jiffies,
1450                                            (unsigned long)(lq_sta->flush_timer +
1451                                                 RS_STAY_IN_COLUMN_TIMEOUT));
1452
1453                 /*
1454                  * Check if we should allow search for new modulation mode.
1455                  * If many frames have failed or succeeded, or we've used
1456                  * this same modulation for a long time, allow search, and
1457                  * reset history stats that keep track of whether we should
1458                  * allow a new search.  Also (below) reset all bitmaps and
1459                  * stats in active history.
1460                  */
1461                 if (force_search ||
1462                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1463                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1464                     ((!lq_sta->search_better_tbl) &&
1465                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1466                         IWL_DEBUG_RATE(mvm,
1467                                        "LQ: stay is expired %d %d %d\n",
1468                                      lq_sta->total_failed,
1469                                      lq_sta->total_success,
1470                                      flush_interval_passed);
1471
1472                         /* Allow search for new mode */
1473                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1474                         IWL_DEBUG_RATE(mvm,
1475                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1476                         lq_sta->total_failed = 0;
1477                         lq_sta->total_success = 0;
1478                         lq_sta->flush_timer = 0;
1479                         /* mark the current column as visited */
1480                         lq_sta->visited_columns = BIT(tbl->column);
1481                 /*
1482                  * Else if we've used this modulation mode enough repetitions
1483                  * (regardless of elapsed time or success/failure), reset
1484                  * history bitmaps and rate-specific stats for all rates in
1485                  * active table.
1486                  */
1487                 } else {
1488                         lq_sta->table_count++;
1489                         if (lq_sta->table_count >=
1490                             lq_sta->table_count_limit) {
1491                                 lq_sta->table_count = 0;
1492
1493                                 IWL_DEBUG_RATE(mvm,
1494                                                "LQ: stay in table clear win\n");
1495                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1496                         }
1497                 }
1498
1499                 /* If transitioning to allow "search", reset all history
1500                  * bitmaps and stats in active table (this will become the new
1501                  * "search" table). */
1502                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1503                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1504                 }
1505         }
1506 }
1507
1508 /*
1509  * setup rate table in uCode
1510  */
1511 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1512                                struct ieee80211_sta *sta,
1513                                struct iwl_lq_sta *lq_sta,
1514                                struct rs_rate *rate)
1515 {
1516         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
1517         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1518 }
1519
1520 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1521                                          struct iwl_lq_sta *lq_sta,
1522                                          struct ieee80211_sta *sta,
1523                                          struct iwl_scale_tbl_info *tbl)
1524 {
1525         int i, j, max_rate;
1526         enum rs_column next_col_id;
1527         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1528         const struct rs_tx_column *next_col;
1529         allow_column_func_t allow_func;
1530         u8 valid_ants = mvm->fw->valid_tx_ant;
1531         const u16 *expected_tpt_tbl;
1532         u16 tpt, max_expected_tpt;
1533
1534         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1535                 next_col_id = curr_col->next_columns[i];
1536
1537                 if (next_col_id == RS_COLUMN_INVALID)
1538                         continue;
1539
1540                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1541                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1542                                        next_col_id);
1543                         continue;
1544                 }
1545
1546                 next_col = &rs_tx_columns[next_col_id];
1547
1548                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1549                         IWL_DEBUG_RATE(mvm,
1550                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1551                                        next_col_id, valid_ants, next_col->ant);
1552                         continue;
1553                 }
1554
1555                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1556                         allow_func = next_col->checks[j];
1557                         if (allow_func && !allow_func(mvm, sta, tbl))
1558                                 break;
1559                 }
1560
1561                 if (j != MAX_COLUMN_CHECKS) {
1562                         IWL_DEBUG_RATE(mvm,
1563                                        "Skip column %d: not allowed (check %d failed)\n",
1564                                        next_col_id, j);
1565
1566                         continue;
1567                 }
1568
1569                 tpt = lq_sta->last_tpt / 100;
1570                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1571                                                      rs_bw_from_sta_bw(sta));
1572                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1573                         continue;
1574
1575                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1576                 if (WARN_ON_ONCE(max_rate == IWL_RATE_INVALID))
1577                         continue;
1578
1579                 max_expected_tpt = expected_tpt_tbl[max_rate];
1580                 if (tpt >= max_expected_tpt) {
1581                         IWL_DEBUG_RATE(mvm,
1582                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1583                                        next_col_id, max_expected_tpt, tpt);
1584                         continue;
1585                 }
1586
1587                 IWL_DEBUG_RATE(mvm,
1588                                "Found potential column %d. Max expected %d current %d\n",
1589                                next_col_id, max_expected_tpt, tpt);
1590                 break;
1591         }
1592
1593         if (i == MAX_NEXT_COLUMNS)
1594                 return RS_COLUMN_INVALID;
1595
1596         return next_col_id;
1597 }
1598
1599 static int rs_switch_to_column(struct iwl_mvm *mvm,
1600                                struct iwl_lq_sta *lq_sta,
1601                                struct ieee80211_sta *sta,
1602                                enum rs_column col_id)
1603 {
1604         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1605         struct iwl_scale_tbl_info *search_tbl =
1606                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1607         struct rs_rate *rate = &search_tbl->rate;
1608         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1609         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1610         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1611                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1612         unsigned long rate_mask = 0;
1613         u32 rate_idx = 0;
1614
1615         memcpy(search_tbl, tbl, sz);
1616
1617         rate->sgi = column->sgi;
1618         rate->ant = column->ant;
1619
1620         if (column->mode == RS_LEGACY) {
1621                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1622                         rate->type = LQ_LEGACY_A;
1623                 else
1624                         rate->type = LQ_LEGACY_G;
1625
1626                 rate_mask = lq_sta->active_legacy_rate;
1627         } else if (column->mode == RS_SISO) {
1628                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1629                 rate_mask = lq_sta->active_siso_rate;
1630         } else if (column->mode == RS_MIMO2) {
1631                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1632                 rate_mask = lq_sta->active_mimo2_rate;
1633         } else {
1634                 WARN_ON_ONCE("Bad column mode");
1635         }
1636
1637         rate->bw = rs_bw_from_sta_bw(sta);
1638         rate->ldpc = lq_sta->ldpc;
1639         search_tbl->column = col_id;
1640         rs_set_expected_tpt_table(lq_sta, search_tbl);
1641
1642         lq_sta->visited_columns |= BIT(col_id);
1643
1644         /* Get the best matching rate if we're changing modes. e.g.
1645          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1646          */
1647         if (curr_column->mode != column->mode) {
1648                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1649                                             rate_mask, rate->index);
1650
1651                 if ((rate_idx == IWL_RATE_INVALID) ||
1652                     !(BIT(rate_idx) & rate_mask)) {
1653                         IWL_DEBUG_RATE(mvm,
1654                                        "can not switch with index %d"
1655                                        " rate mask %lx\n",
1656                                        rate_idx, rate_mask);
1657
1658                         goto err;
1659                 }
1660
1661                 rate->index = rate_idx;
1662         }
1663
1664         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1665                        col_id, rate->index);
1666
1667         return 0;
1668
1669 err:
1670         rate->type = LQ_NONE;
1671         return -1;
1672 }
1673
1674 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1675                                          struct iwl_scale_tbl_info *tbl,
1676                                          s32 sr, int low, int high,
1677                                          int current_tpt,
1678                                          int low_tpt, int high_tpt)
1679 {
1680         enum rs_action action = RS_ACTION_STAY;
1681
1682         if ((sr <= RS_SR_FORCE_DECREASE) || (current_tpt == 0)) {
1683                 IWL_DEBUG_RATE(mvm,
1684                                "Decrease rate because of low SR\n");
1685                 return RS_ACTION_DOWNSCALE;
1686         }
1687
1688         if ((low_tpt == IWL_INVALID_VALUE) &&
1689             (high_tpt == IWL_INVALID_VALUE) &&
1690             (high != IWL_RATE_INVALID)) {
1691                 IWL_DEBUG_RATE(mvm,
1692                                "No data about high/low rates. Increase rate\n");
1693                 return RS_ACTION_UPSCALE;
1694         }
1695
1696         if ((high_tpt == IWL_INVALID_VALUE) &&
1697             (high != IWL_RATE_INVALID) &&
1698             (low_tpt != IWL_INVALID_VALUE) &&
1699             (low_tpt < current_tpt)) {
1700                 IWL_DEBUG_RATE(mvm,
1701                                "No data about high rate and low rate is worse. Increase rate\n");
1702                 return RS_ACTION_UPSCALE;
1703         }
1704
1705         if ((high_tpt != IWL_INVALID_VALUE) &&
1706             (high_tpt > current_tpt)) {
1707                 IWL_DEBUG_RATE(mvm,
1708                                "Higher rate is better. Increate rate\n");
1709                 return RS_ACTION_UPSCALE;
1710         }
1711
1712         if ((low_tpt != IWL_INVALID_VALUE) &&
1713             (high_tpt != IWL_INVALID_VALUE) &&
1714             (low_tpt < current_tpt) &&
1715             (high_tpt < current_tpt)) {
1716                 IWL_DEBUG_RATE(mvm,
1717                                "Both high and low are worse. Maintain rate\n");
1718                 return RS_ACTION_STAY;
1719         }
1720
1721         if ((low_tpt != IWL_INVALID_VALUE) &&
1722             (low_tpt > current_tpt)) {
1723                 IWL_DEBUG_RATE(mvm,
1724                                "Lower rate is better\n");
1725                 action = RS_ACTION_DOWNSCALE;
1726                 goto out;
1727         }
1728
1729         if ((low_tpt == IWL_INVALID_VALUE) &&
1730             (low != IWL_RATE_INVALID)) {
1731                 IWL_DEBUG_RATE(mvm,
1732                                "No data about lower rate\n");
1733                 action = RS_ACTION_DOWNSCALE;
1734                 goto out;
1735         }
1736
1737         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1738
1739 out:
1740         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1741                 if (sr >= RS_SR_NO_DECREASE) {
1742                         IWL_DEBUG_RATE(mvm,
1743                                        "SR is above NO DECREASE. Avoid downscale\n");
1744                         action = RS_ACTION_STAY;
1745                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1746                         IWL_DEBUG_RATE(mvm,
1747                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1748                         action = RS_ACTION_STAY;
1749                 } else {
1750                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1751                 }
1752         }
1753
1754         return action;
1755 }
1756
1757 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1758                                 int *weaker, int *stronger)
1759 {
1760         *weaker = index + TPC_TX_POWER_STEP;
1761         if (*weaker > TPC_MAX_REDUCTION)
1762                 *weaker = TPC_INVALID;
1763
1764         *stronger = index - TPC_TX_POWER_STEP;
1765         if (*stronger < 0)
1766                 *stronger = TPC_INVALID;
1767 }
1768
1769 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1770                            struct rs_rate *rate, enum ieee80211_band band)
1771 {
1772         int index = rate->index;
1773         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1774         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1775                                 !vif->bss_conf.ps);
1776
1777         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1778                        cam, sta_ps_disabled);
1779         /*
1780          * allow tpc only if power management is enabled, or bt coex
1781          * activity grade allows it and we are on 2.4Ghz.
1782          */
1783         if ((cam || sta_ps_disabled) &&
1784             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1785                 return false;
1786
1787         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1788         if (is_legacy(rate))
1789                 return index == IWL_RATE_54M_INDEX;
1790         if (is_ht(rate))
1791                 return index == IWL_RATE_MCS_7_INDEX;
1792         if (is_vht(rate))
1793                 return index == IWL_RATE_MCS_7_INDEX ||
1794                        index == IWL_RATE_MCS_8_INDEX ||
1795                        index == IWL_RATE_MCS_9_INDEX;
1796
1797         WARN_ON_ONCE(1);
1798         return false;
1799 }
1800
1801 enum tpc_action {
1802         TPC_ACTION_STAY,
1803         TPC_ACTION_DECREASE,
1804         TPC_ACTION_INCREASE,
1805         TPC_ACTION_NO_RESTIRCTION,
1806 };
1807
1808 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1809                                          s32 sr, int weak, int strong,
1810                                          int current_tpt,
1811                                          int weak_tpt, int strong_tpt)
1812 {
1813         /* stay until we have valid tpt */
1814         if (current_tpt == IWL_INVALID_VALUE) {
1815                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1816                 return TPC_ACTION_STAY;
1817         }
1818
1819         /* Too many failures, increase txp */
1820         if (sr <= TPC_SR_FORCE_INCREASE || current_tpt == 0) {
1821                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1822                 return TPC_ACTION_NO_RESTIRCTION;
1823         }
1824
1825         /* try decreasing first if applicable */
1826         if (weak != TPC_INVALID) {
1827                 if (weak_tpt == IWL_INVALID_VALUE &&
1828                     (strong_tpt == IWL_INVALID_VALUE ||
1829                      current_tpt >= strong_tpt)) {
1830                         IWL_DEBUG_RATE(mvm,
1831                                        "no weak txp measurement. decrease txp\n");
1832                         return TPC_ACTION_DECREASE;
1833                 }
1834
1835                 if (weak_tpt > current_tpt) {
1836                         IWL_DEBUG_RATE(mvm,
1837                                        "lower txp has better tpt. decrease txp\n");
1838                         return TPC_ACTION_DECREASE;
1839                 }
1840         }
1841
1842         /* next, increase if needed */
1843         if (sr < TPC_SR_NO_INCREASE && strong != TPC_INVALID) {
1844                 if (weak_tpt == IWL_INVALID_VALUE &&
1845                     strong_tpt != IWL_INVALID_VALUE &&
1846                     current_tpt < strong_tpt) {
1847                         IWL_DEBUG_RATE(mvm,
1848                                        "higher txp has better tpt. increase txp\n");
1849                         return TPC_ACTION_INCREASE;
1850                 }
1851
1852                 if (weak_tpt < current_tpt &&
1853                     (strong_tpt == IWL_INVALID_VALUE ||
1854                      strong_tpt > current_tpt)) {
1855                         IWL_DEBUG_RATE(mvm,
1856                                        "lower txp has worse tpt. increase txp\n");
1857                         return TPC_ACTION_INCREASE;
1858                 }
1859         }
1860
1861         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1862         return TPC_ACTION_STAY;
1863 }
1864
1865 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1866                            struct ieee80211_sta *sta,
1867                            struct iwl_lq_sta *lq_sta,
1868                            struct iwl_scale_tbl_info *tbl)
1869 {
1870         struct iwl_mvm_sta *mvm_sta = (void *)sta->drv_priv;
1871         struct ieee80211_vif *vif = mvm_sta->vif;
1872         struct ieee80211_chanctx_conf *chanctx_conf;
1873         enum ieee80211_band band;
1874         struct iwl_rate_scale_data *window;
1875         struct rs_rate *rate = &tbl->rate;
1876         enum tpc_action action;
1877         s32 sr;
1878         u8 cur = lq_sta->lq.reduced_tpc;
1879         int current_tpt;
1880         int weak, strong;
1881         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1882
1883 #ifdef CONFIG_MAC80211_DEBUGFS
1884         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1885                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1886                                lq_sta->pers.dbg_fixed_txp_reduction);
1887                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1888                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1889         }
1890 #endif
1891
1892         rcu_read_lock();
1893         chanctx_conf = rcu_dereference(vif->chanctx_conf);
1894         if (WARN_ON(!chanctx_conf))
1895                 band = IEEE80211_NUM_BANDS;
1896         else
1897                 band = chanctx_conf->def.chan->band;
1898         rcu_read_unlock();
1899
1900         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1901                 IWL_DEBUG_RATE(mvm,
1902                                "tpc is not allowed. remove txp restrictions\n");
1903                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1904                 return cur != TPC_NO_REDUCTION;
1905         }
1906
1907         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1908
1909         /* Collect measured throughputs for current and adjacent rates */
1910         window = tbl->tpc_win;
1911         sr = window[cur].success_ratio;
1912         current_tpt = window[cur].average_tpt;
1913         if (weak != TPC_INVALID)
1914                 weak_tpt = window[weak].average_tpt;
1915         if (strong != TPC_INVALID)
1916                 strong_tpt = window[strong].average_tpt;
1917
1918         IWL_DEBUG_RATE(mvm,
1919                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1920                        cur, current_tpt, sr, weak, strong,
1921                        weak_tpt, strong_tpt);
1922
1923         action = rs_get_tpc_action(mvm, sr, weak, strong,
1924                                    current_tpt, weak_tpt, strong_tpt);
1925
1926         /* override actions if we are on the edge */
1927         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
1928                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
1929                 action = TPC_ACTION_STAY;
1930         } else if (strong == TPC_INVALID &&
1931                    (action == TPC_ACTION_INCREASE ||
1932                     action == TPC_ACTION_NO_RESTIRCTION)) {
1933                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
1934                 action = TPC_ACTION_STAY;
1935         }
1936
1937         switch (action) {
1938         case TPC_ACTION_DECREASE:
1939                 lq_sta->lq.reduced_tpc = weak;
1940                 return true;
1941         case TPC_ACTION_INCREASE:
1942                 lq_sta->lq.reduced_tpc = strong;
1943                 return true;
1944         case TPC_ACTION_NO_RESTIRCTION:
1945                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1946                 return true;
1947         case TPC_ACTION_STAY:
1948                 /* do nothing */
1949                 break;
1950         }
1951         return false;
1952 }
1953
1954 /*
1955  * Do rate scaling and search for new modulation mode.
1956  */
1957 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1958                                   struct ieee80211_sta *sta,
1959                                   struct iwl_lq_sta *lq_sta,
1960                                   int tid)
1961 {
1962         int low = IWL_RATE_INVALID;
1963         int high = IWL_RATE_INVALID;
1964         int index;
1965         struct iwl_rate_scale_data *window = NULL;
1966         int current_tpt = IWL_INVALID_VALUE;
1967         int low_tpt = IWL_INVALID_VALUE;
1968         int high_tpt = IWL_INVALID_VALUE;
1969         u32 fail_count;
1970         enum rs_action scale_action = RS_ACTION_STAY;
1971         u16 rate_mask;
1972         u8 update_lq = 0;
1973         struct iwl_scale_tbl_info *tbl, *tbl1;
1974         u8 active_tbl = 0;
1975         u8 done_search = 0;
1976         u16 high_low;
1977         s32 sr;
1978         u8 prev_agg = lq_sta->is_agg;
1979         struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
1980         struct iwl_mvm_tid_data *tid_data;
1981         struct rs_rate *rate;
1982
1983         lq_sta->is_agg = !!sta_priv->agg_tids;
1984
1985         /*
1986          * Select rate-scale / modulation-mode table to work with in
1987          * the rest of this function:  "search" if searching for better
1988          * modulation mode, or "active" if doing rate scaling within a mode.
1989          */
1990         if (!lq_sta->search_better_tbl)
1991                 active_tbl = lq_sta->active_tbl;
1992         else
1993                 active_tbl = 1 - lq_sta->active_tbl;
1994
1995         tbl = &(lq_sta->lq_info[active_tbl]);
1996         rate = &tbl->rate;
1997
1998         if (prev_agg != lq_sta->is_agg) {
1999                 IWL_DEBUG_RATE(mvm,
2000                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2001                                prev_agg, lq_sta->is_agg);
2002                 rs_set_expected_tpt_table(lq_sta, tbl);
2003                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2004         }
2005
2006         /* current tx rate */
2007         index = lq_sta->last_txrate_idx;
2008
2009         /* rates available for this association, and for modulation mode */
2010         rate_mask = rs_get_supported_rates(lq_sta, rate);
2011
2012         if (!(BIT(index) & rate_mask)) {
2013                 IWL_ERR(mvm, "Current Rate is not valid\n");
2014                 if (lq_sta->search_better_tbl) {
2015                         /* revert to active table if search table is not valid*/
2016                         rate->type = LQ_NONE;
2017                         lq_sta->search_better_tbl = 0;
2018                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2019                         rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2020                 }
2021                 return;
2022         }
2023
2024         /* Get expected throughput table and history window for current rate */
2025         if (!tbl->expected_tpt) {
2026                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2027                 return;
2028         }
2029
2030         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2031         window = &(tbl->win[index]);
2032
2033         /*
2034          * If there is not enough history to calculate actual average
2035          * throughput, keep analyzing results of more tx frames, without
2036          * changing rate or mode (bypass most of the rest of this function).
2037          * Set up new rate table in uCode only if old rate is not supported
2038          * in current association (use new rate found above).
2039          */
2040         fail_count = window->counter - window->success_counter;
2041         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2042             (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2043                 IWL_DEBUG_RATE(mvm,
2044                                "(%s: %d): Test Window: succ %d total %d\n",
2045                                rs_pretty_lq_type(rate->type),
2046                                index, window->success_counter, window->counter);
2047
2048                 /* Can't calculate this yet; not enough history */
2049                 window->average_tpt = IWL_INVALID_VALUE;
2050
2051                 /* Should we stay with this modulation mode,
2052                  * or search for a new one? */
2053                 rs_stay_in_table(lq_sta, false);
2054
2055                 goto out;
2056         }
2057         /* Else we have enough samples; calculate estimate of
2058          * actual average throughput */
2059         if (window->average_tpt != ((window->success_ratio *
2060                         tbl->expected_tpt[index] + 64) / 128)) {
2061                 window->average_tpt = ((window->success_ratio *
2062                                         tbl->expected_tpt[index] + 64) / 128);
2063         }
2064
2065         /* If we are searching for better modulation mode, check success. */
2066         if (lq_sta->search_better_tbl) {
2067                 /* If good success, continue using the "search" mode;
2068                  * no need to send new link quality command, since we're
2069                  * continuing to use the setup that we've been trying. */
2070                 if (window->average_tpt > lq_sta->last_tpt) {
2071                         IWL_DEBUG_RATE(mvm,
2072                                        "SWITCHING TO NEW TABLE SR: %d "
2073                                        "cur-tpt %d old-tpt %d\n",
2074                                        window->success_ratio,
2075                                        window->average_tpt,
2076                                        lq_sta->last_tpt);
2077
2078                         /* Swap tables; "search" becomes "active" */
2079                         lq_sta->active_tbl = active_tbl;
2080                         current_tpt = window->average_tpt;
2081                 /* Else poor success; go back to mode in "active" table */
2082                 } else {
2083                         IWL_DEBUG_RATE(mvm,
2084                                        "GOING BACK TO THE OLD TABLE: SR %d "
2085                                        "cur-tpt %d old-tpt %d\n",
2086                                        window->success_ratio,
2087                                        window->average_tpt,
2088                                        lq_sta->last_tpt);
2089
2090                         /* Nullify "search" table */
2091                         rate->type = LQ_NONE;
2092
2093                         /* Revert to "active" table */
2094                         active_tbl = lq_sta->active_tbl;
2095                         tbl = &(lq_sta->lq_info[active_tbl]);
2096
2097                         /* Revert to "active" rate and throughput info */
2098                         index = tbl->rate.index;
2099                         current_tpt = lq_sta->last_tpt;
2100
2101                         /* Need to set up a new rate table in uCode */
2102                         update_lq = 1;
2103                 }
2104
2105                 /* Either way, we've made a decision; modulation mode
2106                  * search is done, allow rate adjustment next time. */
2107                 lq_sta->search_better_tbl = 0;
2108                 done_search = 1;        /* Don't switch modes below! */
2109                 goto lq_update;
2110         }
2111
2112         /* (Else) not in search of better modulation mode, try for better
2113          * starting rate, while staying in this mode. */
2114         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2115         low = high_low & 0xff;
2116         high = (high_low >> 8) & 0xff;
2117
2118         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2119
2120         sr = window->success_ratio;
2121
2122         /* Collect measured throughputs for current and adjacent rates */
2123         current_tpt = window->average_tpt;
2124         if (low != IWL_RATE_INVALID)
2125                 low_tpt = tbl->win[low].average_tpt;
2126         if (high != IWL_RATE_INVALID)
2127                 high_tpt = tbl->win[high].average_tpt;
2128
2129         IWL_DEBUG_RATE(mvm,
2130                        "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2131                        rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2132                        low, high, low_tpt, high_tpt);
2133
2134         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2135                                           current_tpt, low_tpt, high_tpt);
2136
2137         /* Force a search in case BT doesn't like us being in MIMO */
2138         if (is_mimo(rate) &&
2139             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2140                 IWL_DEBUG_RATE(mvm,
2141                                "BT Coex forbids MIMO. Search for new config\n");
2142                 rs_stay_in_table(lq_sta, true);
2143                 goto lq_update;
2144         }
2145
2146         switch (scale_action) {
2147         case RS_ACTION_DOWNSCALE:
2148                 /* Decrease starting rate, update uCode's rate table */
2149                 if (low != IWL_RATE_INVALID) {
2150                         update_lq = 1;
2151                         index = low;
2152                 } else {
2153                         IWL_DEBUG_RATE(mvm,
2154                                        "At the bottom rate. Can't decrease\n");
2155                 }
2156
2157                 break;
2158         case RS_ACTION_UPSCALE:
2159                 /* Increase starting rate, update uCode's rate table */
2160                 if (high != IWL_RATE_INVALID) {
2161                         update_lq = 1;
2162                         index = high;
2163                 } else {
2164                         IWL_DEBUG_RATE(mvm,
2165                                        "At the top rate. Can't increase\n");
2166                 }
2167
2168                 break;
2169         case RS_ACTION_STAY:
2170                 /* No change */
2171                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2172                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2173                 break;
2174         default:
2175                 break;
2176         }
2177
2178 lq_update:
2179         /* Replace uCode's rate table for the destination station. */
2180         if (update_lq) {
2181                 tbl->rate.index = index;
2182                 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2183         }
2184
2185         rs_stay_in_table(lq_sta, false);
2186
2187         /*
2188          * Search for new modulation mode if we're:
2189          * 1)  Not changing rates right now
2190          * 2)  Not just finishing up a search
2191          * 3)  Allowing a new search
2192          */
2193         if (!update_lq && !done_search &&
2194             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2195             && window->counter) {
2196                 enum rs_column next_column;
2197
2198                 /* Save current throughput to compare with "search" throughput*/
2199                 lq_sta->last_tpt = current_tpt;
2200
2201                 IWL_DEBUG_RATE(mvm,
2202                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2203                                update_lq, done_search, lq_sta->rs_state,
2204                                window->counter);
2205
2206                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2207                 if (next_column != RS_COLUMN_INVALID) {
2208                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2209                                                       next_column);
2210                         if (!ret)
2211                                 lq_sta->search_better_tbl = 1;
2212                 } else {
2213                         IWL_DEBUG_RATE(mvm,
2214                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2215                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2216                 }
2217
2218                 /* If new "search" mode was selected, set up in uCode table */
2219                 if (lq_sta->search_better_tbl) {
2220                         /* Access the "search" table, clear its history. */
2221                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2222                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2223
2224                         /* Use new "search" start rate */
2225                         index = tbl->rate.index;
2226
2227                         rs_dump_rate(mvm, &tbl->rate,
2228                                      "Switch to SEARCH TABLE:");
2229                         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
2230                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2231                 } else {
2232                         done_search = 1;
2233                 }
2234         }
2235
2236         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2237                 /* If the "active" (non-search) mode was legacy,
2238                  * and we've tried switching antennas,
2239                  * but we haven't been able to try HT modes (not available),
2240                  * stay with best antenna legacy modulation for a while
2241                  * before next round of mode comparisons. */
2242                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2243                 if (is_legacy(&tbl1->rate)) {
2244                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2245
2246                         if (tid != IWL_MAX_TID_COUNT) {
2247                                 tid_data = &sta_priv->tid_data[tid];
2248                                 if (tid_data->state != IWL_AGG_OFF) {
2249                                         IWL_DEBUG_RATE(mvm,
2250                                                        "Stop aggregation on tid %d\n",
2251                                                        tid);
2252                                         ieee80211_stop_tx_ba_session(sta, tid);
2253                                 }
2254                         }
2255                         rs_set_stay_in_table(mvm, 1, lq_sta);
2256                 } else {
2257                 /* If we're in an HT mode, and all 3 mode switch actions
2258                  * have been tried and compared, stay in this best modulation
2259                  * mode for a while before next round of mode comparisons. */
2260                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2261                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2262                             (tid != IWL_MAX_TID_COUNT)) {
2263                                 tid_data = &sta_priv->tid_data[tid];
2264                                 if (tid_data->state == IWL_AGG_OFF) {
2265                                         IWL_DEBUG_RATE(mvm,
2266                                                        "try to aggregate tid %d\n",
2267                                                        tid);
2268                                         rs_tl_turn_on_agg(mvm, tid,
2269                                                           lq_sta, sta);
2270                                 }
2271                         }
2272                         rs_set_stay_in_table(mvm, 0, lq_sta);
2273                 }
2274         }
2275
2276 out:
2277         lq_sta->last_txrate_idx = index;
2278 }
2279
2280 struct rs_init_rate_info {
2281         s8 rssi;
2282         u8 rate_idx;
2283 };
2284
2285 static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
2286         { -60, IWL_RATE_54M_INDEX },
2287         { -64, IWL_RATE_48M_INDEX },
2288         { -68, IWL_RATE_36M_INDEX },
2289         { -80, IWL_RATE_24M_INDEX },
2290         { -84, IWL_RATE_18M_INDEX },
2291         { -85, IWL_RATE_12M_INDEX },
2292         { -86, IWL_RATE_11M_INDEX },
2293         { -88, IWL_RATE_5M_INDEX  },
2294         { -90, IWL_RATE_2M_INDEX  },
2295         { S8_MIN, IWL_RATE_1M_INDEX },
2296 };
2297
2298 static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
2299         { -60, IWL_RATE_54M_INDEX },
2300         { -64, IWL_RATE_48M_INDEX },
2301         { -72, IWL_RATE_36M_INDEX },
2302         { -80, IWL_RATE_24M_INDEX },
2303         { -84, IWL_RATE_18M_INDEX },
2304         { -85, IWL_RATE_12M_INDEX },
2305         { -87, IWL_RATE_9M_INDEX  },
2306         { S8_MIN, IWL_RATE_6M_INDEX },
2307 };
2308
2309 /* Choose an initial legacy rate and antenna to use based on the RSSI
2310  * of last Rx
2311  */
2312 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2313                                 struct iwl_lq_sta *lq_sta,
2314                                 enum ieee80211_band band,
2315                                 struct rs_rate *rate)
2316 {
2317         int i, nentries;
2318         s8 best_rssi = S8_MIN;
2319         u8 best_ant = ANT_NONE;
2320         u8 valid_tx_ant = mvm->fw->valid_tx_ant;
2321         const struct rs_init_rate_info *initial_rates;
2322
2323         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2324                 if (!(lq_sta->pers.chains & BIT(i)))
2325                         continue;
2326
2327                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2328                         best_rssi = lq_sta->pers.chain_signal[i];
2329                         best_ant = BIT(i);
2330                 }
2331         }
2332
2333         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2334                        rs_pretty_ant(best_ant), best_rssi);
2335
2336         if (best_ant != ANT_A && best_ant != ANT_B)
2337                 rate->ant = first_antenna(valid_tx_ant);
2338         else
2339                 rate->ant = best_ant;
2340
2341         rate->sgi = false;
2342         rate->ldpc = false;
2343         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2344
2345         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2346                                      BITS_PER_LONG);
2347
2348         if (band == IEEE80211_BAND_5GHZ) {
2349                 rate->type = LQ_LEGACY_A;
2350                 initial_rates = rs_init_rates_5ghz;
2351                 nentries = ARRAY_SIZE(rs_init_rates_5ghz);
2352         } else {
2353                 rate->type = LQ_LEGACY_G;
2354                 initial_rates = rs_init_rates_24ghz;
2355                 nentries = ARRAY_SIZE(rs_init_rates_24ghz);
2356         }
2357
2358         if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2359                 for (i = 0; i < nentries; i++) {
2360                         int rate_idx = initial_rates[i].rate_idx;
2361                         if ((best_rssi >= initial_rates[i].rssi) &&
2362                             (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2363                                 rate->index = rate_idx;
2364                                 break;
2365                         }
2366                 }
2367         }
2368
2369         IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2370                        rs_pretty_ant(rate->ant));
2371 }
2372
2373 /* Save info about RSSI of last Rx */
2374 void rs_update_last_rssi(struct iwl_mvm *mvm,
2375                          struct iwl_lq_sta *lq_sta,
2376                          struct ieee80211_rx_status *rx_status)
2377 {
2378         lq_sta->pers.chains = rx_status->chains;
2379         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2380         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2381         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2382 }
2383
2384 /**
2385  * rs_initialize_lq - Initialize a station's hardware rate table
2386  *
2387  * The uCode's station table contains a table of fallback rates
2388  * for automatic fallback during transmission.
2389  *
2390  * NOTE: This sets up a default set of values.  These will be replaced later
2391  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2392  *       rc80211_simple.
2393  *
2394  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2395  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2396  *       which requires station table entry to exist).
2397  */
2398 static void rs_initialize_lq(struct iwl_mvm *mvm,
2399                              struct ieee80211_sta *sta,
2400                              struct iwl_lq_sta *lq_sta,
2401                              enum ieee80211_band band,
2402                              bool init)
2403 {
2404         struct iwl_scale_tbl_info *tbl;
2405         struct rs_rate *rate;
2406         u8 active_tbl = 0;
2407
2408         if (!sta || !lq_sta)
2409                 return;
2410
2411         if (!lq_sta->search_better_tbl)
2412                 active_tbl = lq_sta->active_tbl;
2413         else
2414                 active_tbl = 1 - lq_sta->active_tbl;
2415
2416         tbl = &(lq_sta->lq_info[active_tbl]);
2417         rate = &tbl->rate;
2418
2419         rs_get_initial_rate(mvm, lq_sta, band, rate);
2420         lq_sta->last_txrate_idx = rate->index;
2421
2422         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2423         if (rate->ant == ANT_A)
2424                 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2425         else
2426                 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2427
2428         rs_set_expected_tpt_table(lq_sta, tbl);
2429         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2430         /* TODO restore station should remember the lq cmd */
2431         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2432 }
2433
2434 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2435                         struct ieee80211_tx_rate_control *txrc)
2436 {
2437         struct sk_buff *skb = txrc->skb;
2438         struct iwl_op_mode *op_mode __maybe_unused =
2439                         (struct iwl_op_mode *)mvm_r;
2440         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2441         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2442         struct iwl_lq_sta *lq_sta = mvm_sta;
2443
2444         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2445
2446         /* Treat uninitialized rate scaling data same as non-existing. */
2447         if (lq_sta && !lq_sta->pers.drv) {
2448                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2449                 mvm_sta = NULL;
2450         }
2451
2452         /* Send management frames and NO_ACK data using lowest rate. */
2453         if (rate_control_send_low(sta, mvm_sta, txrc))
2454                 return;
2455
2456         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2457                                   info->band, &info->control.rates[0]);
2458
2459         info->control.rates[0].count = 1;
2460 }
2461
2462 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2463                           gfp_t gfp)
2464 {
2465         struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2466         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2467         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2468         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2469
2470         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2471
2472         lq_sta->pers.drv = mvm;
2473 #ifdef CONFIG_MAC80211_DEBUGFS
2474         lq_sta->pers.dbg_fixed_rate = 0;
2475         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2476 #endif
2477         lq_sta->pers.chains = 0;
2478         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2479
2480         return &sta_priv->lq_sta;
2481 }
2482
2483 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2484                                        int nss)
2485 {
2486         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2487                 (0x3 << (2 * (nss - 1)));
2488         rx_mcs >>= (2 * (nss - 1));
2489
2490         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2491                 return IWL_RATE_MCS_7_INDEX;
2492         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2493                 return IWL_RATE_MCS_8_INDEX;
2494         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2495                 return IWL_RATE_MCS_9_INDEX;
2496
2497         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2498         return -1;
2499 }
2500
2501 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2502                                      struct ieee80211_sta_vht_cap *vht_cap,
2503                                      struct iwl_lq_sta *lq_sta)
2504 {
2505         int i;
2506         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2507
2508         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2509                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2510                         if (i == IWL_RATE_9M_INDEX)
2511                                 continue;
2512
2513                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2514                         if (i == IWL_RATE_MCS_9_INDEX &&
2515                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2516                                 continue;
2517
2518                         lq_sta->active_siso_rate |= BIT(i);
2519                 }
2520         }
2521
2522         if (sta->rx_nss < 2)
2523                 return;
2524
2525         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2526         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2527                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2528                         if (i == IWL_RATE_9M_INDEX)
2529                                 continue;
2530
2531                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2532                         if (i == IWL_RATE_MCS_9_INDEX &&
2533                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2534                                 continue;
2535
2536                         lq_sta->active_mimo2_rate |= BIT(i);
2537                 }
2538         }
2539 }
2540
2541 #ifdef CONFIG_IWLWIFI_DEBUGFS
2542 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm,
2543                                       struct iwl_mvm_frame_stats *stats)
2544 {
2545         spin_lock_bh(&mvm->drv_stats_lock);
2546         memset(stats, 0, sizeof(*stats));
2547         spin_unlock_bh(&mvm->drv_stats_lock);
2548 }
2549
2550 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm,
2551                                 struct iwl_mvm_frame_stats *stats,
2552                                 u32 rate, bool agg)
2553 {
2554         u8 nss = 0, mcs = 0;
2555
2556         spin_lock(&mvm->drv_stats_lock);
2557
2558         if (agg)
2559                 stats->agg_frames++;
2560
2561         stats->success_frames++;
2562
2563         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2564         case RATE_MCS_CHAN_WIDTH_20:
2565                 stats->bw_20_frames++;
2566                 break;
2567         case RATE_MCS_CHAN_WIDTH_40:
2568                 stats->bw_40_frames++;
2569                 break;
2570         case RATE_MCS_CHAN_WIDTH_80:
2571                 stats->bw_80_frames++;
2572                 break;
2573         default:
2574                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2575         }
2576
2577         if (rate & RATE_MCS_HT_MSK) {
2578                 stats->ht_frames++;
2579                 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2580                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2581         } else if (rate & RATE_MCS_VHT_MSK) {
2582                 stats->vht_frames++;
2583                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2584                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2585                        RATE_VHT_MCS_NSS_POS) + 1;
2586         } else {
2587                 stats->legacy_frames++;
2588         }
2589
2590         if (nss == 1)
2591                 stats->siso_frames++;
2592         else if (nss == 2)
2593                 stats->mimo2_frames++;
2594
2595         if (rate & RATE_MCS_SGI_MSK)
2596                 stats->sgi_frames++;
2597         else
2598                 stats->ngi_frames++;
2599
2600         stats->last_rates[stats->last_frame_idx] = rate;
2601         stats->last_frame_idx = (stats->last_frame_idx + 1) %
2602                 ARRAY_SIZE(stats->last_rates);
2603
2604         spin_unlock(&mvm->drv_stats_lock);
2605 }
2606 #endif
2607
2608 /*
2609  * Called after adding a new station to initialize rate scaling
2610  */
2611 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2612                           enum ieee80211_band band, bool init)
2613 {
2614         int i, j;
2615         struct ieee80211_hw *hw = mvm->hw;
2616         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2617         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2618         struct iwl_mvm_sta *sta_priv;
2619         struct iwl_lq_sta *lq_sta;
2620         struct ieee80211_supported_band *sband;
2621         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2622
2623         sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2624         lq_sta = &sta_priv->lq_sta;
2625
2626         /* clear all non-persistent lq data */
2627         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2628
2629         sband = hw->wiphy->bands[band];
2630
2631         lq_sta->lq.sta_id = sta_priv->sta_id;
2632
2633         for (j = 0; j < LQ_SIZE; j++)
2634                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2635
2636         lq_sta->flush_timer = 0;
2637         lq_sta->last_tx = jiffies;
2638
2639         IWL_DEBUG_RATE(mvm,
2640                        "LQ: *** rate scale station global init for station %d ***\n",
2641                        sta_priv->sta_id);
2642         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2643          * the lowest or the highest rate.. Could consider using RSSI from
2644          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2645          * after assoc.. */
2646
2647         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2648         lq_sta->band = sband->band;
2649         /*
2650          * active legacy rates as per supported rates bitmap
2651          */
2652         supp = sta->supp_rates[sband->band];
2653         lq_sta->active_legacy_rate = 0;
2654         for_each_set_bit(i, &supp, BITS_PER_LONG)
2655                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2656
2657         /* TODO: should probably account for rx_highest for both HT/VHT */
2658         if (!vht_cap || !vht_cap->vht_supported) {
2659                 /* active_siso_rate mask includes 9 MBits (bit 5),
2660                  * and CCK (bits 0-3), supp_rates[] does not;
2661                  * shift to convert format, force 9 MBits off.
2662                  */
2663                 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2664                 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2665                 lq_sta->active_siso_rate &= ~((u16)0x2);
2666                 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2667
2668                 /* Same here */
2669                 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2670                 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2671                 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2672                 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2673
2674                 lq_sta->is_vht = false;
2675                 if (mvm->cfg->ht_params->ldpc &&
2676                     (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2677                         lq_sta->ldpc = true;
2678         } else {
2679                 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2680                 lq_sta->is_vht = true;
2681
2682                 if (mvm->cfg->ht_params->ldpc &&
2683                     (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2684                         lq_sta->ldpc = true;
2685         }
2686
2687         lq_sta->max_legacy_rate_idx = find_last_bit(&lq_sta->active_legacy_rate,
2688                                                     BITS_PER_LONG);
2689         lq_sta->max_siso_rate_idx = find_last_bit(&lq_sta->active_siso_rate,
2690                                                   BITS_PER_LONG);
2691         lq_sta->max_mimo2_rate_idx = find_last_bit(&lq_sta->active_mimo2_rate,
2692                                                    BITS_PER_LONG);
2693
2694         IWL_DEBUG_RATE(mvm,
2695                        "RATE MASK: LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d\n",
2696                        lq_sta->active_legacy_rate,
2697                        lq_sta->active_siso_rate,
2698                        lq_sta->active_mimo2_rate,
2699                        lq_sta->is_vht, lq_sta->ldpc);
2700         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2701                        lq_sta->max_legacy_rate_idx,
2702                        lq_sta->max_siso_rate_idx,
2703                        lq_sta->max_mimo2_rate_idx);
2704
2705         /* These values will be overridden later */
2706         lq_sta->lq.single_stream_ant_msk =
2707                 first_antenna(mvm->fw->valid_tx_ant);
2708         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2709
2710         /* as default allow aggregation for all tids */
2711         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2712         lq_sta->is_agg = 0;
2713 #ifdef CONFIG_IWLWIFI_DEBUGFS
2714         iwl_mvm_reset_frame_stats(mvm, &mvm->drv_rx_stats);
2715 #endif
2716         rs_initialize_lq(mvm, sta, lq_sta, band, init);
2717 }
2718
2719 static void rs_rate_update(void *mvm_r,
2720                            struct ieee80211_supported_band *sband,
2721                            struct cfg80211_chan_def *chandef,
2722                            struct ieee80211_sta *sta, void *priv_sta,
2723                            u32 changed)
2724 {
2725         u8 tid;
2726         struct iwl_op_mode *op_mode  =
2727                         (struct iwl_op_mode *)mvm_r;
2728         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2729
2730         /* Stop any ongoing aggregations as rs starts off assuming no agg */
2731         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2732                 ieee80211_stop_tx_ba_session(sta, tid);
2733
2734         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2735 }
2736
2737 #ifdef CONFIG_MAC80211_DEBUGFS
2738 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2739                                             struct iwl_lq_cmd *lq_cmd,
2740                                             enum ieee80211_band band,
2741                                             u32 ucode_rate)
2742 {
2743         struct rs_rate rate;
2744         int i;
2745         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2746         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2747         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2748
2749         for (i = 0; i < num_rates; i++)
2750                 lq_cmd->rs_table[i] = ucode_rate_le32;
2751
2752         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2753
2754         if (is_mimo(&rate))
2755                 lq_cmd->mimo_delim = num_rates - 1;
2756         else
2757                 lq_cmd->mimo_delim = 0;
2758
2759         lq_cmd->reduced_tpc = 0;
2760
2761         if (num_of_ant(ant) == 1)
2762                 lq_cmd->single_stream_ant_msk = ant;
2763
2764         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2765 }
2766 #endif /* CONFIG_MAC80211_DEBUGFS */
2767
2768 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2769                                      struct iwl_lq_sta *lq_sta,
2770                                      struct rs_rate *rate,
2771                                      __le32 *rs_table, int *rs_table_index,
2772                                      int num_rates, int num_retries,
2773                                      u8 valid_tx_ant, bool toggle_ant)
2774 {
2775         int i, j;
2776         __le32 ucode_rate;
2777         bool bottom_reached = false;
2778         int prev_rate_idx = rate->index;
2779         int end = LINK_QUAL_MAX_RETRY_NUM;
2780         int index = *rs_table_index;
2781
2782         for (i = 0; i < num_rates && index < end; i++) {
2783                 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, rate));
2784                 for (j = 0; j < num_retries && index < end; j++, index++)
2785                         rs_table[index] = ucode_rate;
2786
2787                 if (toggle_ant)
2788                         rs_toggle_antenna(valid_tx_ant, rate);
2789
2790                 prev_rate_idx = rate->index;
2791                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2792                 if (bottom_reached && !is_legacy(rate))
2793                         break;
2794         }
2795
2796         if (!bottom_reached)
2797                 rate->index = prev_rate_idx;
2798
2799         *rs_table_index = index;
2800 }
2801
2802 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2803  * column the rate table should look like this:
2804  *
2805  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2806  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2807  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2808  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2809  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2810  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2811  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2812  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2813  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2814  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2815  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2816  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2817  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2818  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2819  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2820  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2821  */
2822 static void rs_build_rates_table(struct iwl_mvm *mvm,
2823                                  struct iwl_lq_sta *lq_sta,
2824                                  const struct rs_rate *initial_rate)
2825 {
2826         struct rs_rate rate;
2827         int num_rates, num_retries, index = 0;
2828         u8 valid_tx_ant = 0;
2829         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2830         bool toggle_ant = false;
2831
2832         memcpy(&rate, initial_rate, sizeof(rate));
2833
2834         valid_tx_ant = mvm->fw->valid_tx_ant;
2835
2836         if (is_siso(&rate)) {
2837                 num_rates = RS_INITIAL_SISO_NUM_RATES;
2838                 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
2839         } else if (is_mimo(&rate)) {
2840                 num_rates = RS_INITIAL_MIMO_NUM_RATES;
2841                 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
2842         } else {
2843                 num_rates = RS_INITIAL_LEGACY_NUM_RATES;
2844                 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2845                 toggle_ant = true;
2846         }
2847
2848         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2849                                  num_rates, num_retries, valid_tx_ant,
2850                                  toggle_ant);
2851
2852         rs_get_lower_rate_down_column(lq_sta, &rate);
2853
2854         if (is_siso(&rate)) {
2855                 num_rates = RS_SECONDARY_SISO_NUM_RATES;
2856                 num_retries = RS_SECONDARY_SISO_RETRIES;
2857                 lq_cmd->mimo_delim = index;
2858         } else if (is_legacy(&rate)) {
2859                 num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2860                 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2861         } else {
2862                 WARN_ON_ONCE(1);
2863         }
2864
2865         toggle_ant = true;
2866
2867         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2868                                  num_rates, num_retries, valid_tx_ant,
2869                                  toggle_ant);
2870
2871         rs_get_lower_rate_down_column(lq_sta, &rate);
2872
2873         num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2874         num_retries = RS_LEGACY_RETRIES_PER_RATE;
2875
2876         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2877                                  num_rates, num_retries, valid_tx_ant,
2878                                  toggle_ant);
2879
2880 }
2881
2882 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
2883                            struct ieee80211_sta *sta,
2884                            struct iwl_lq_sta *lq_sta,
2885                            const struct rs_rate *initial_rate)
2886 {
2887         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2888         struct iwl_mvm_sta *mvmsta;
2889         struct iwl_mvm_vif *mvmvif;
2890
2891         lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2892         lq_cmd->agg_time_limit =
2893                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2894
2895 #ifdef CONFIG_MAC80211_DEBUGFS
2896         if (lq_sta->pers.dbg_fixed_rate) {
2897                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
2898                                                 lq_sta->band,
2899                                                 lq_sta->pers.dbg_fixed_rate);
2900                 return;
2901         }
2902 #endif
2903         if (WARN_ON_ONCE(!sta || !initial_rate))
2904                 return;
2905
2906         rs_build_rates_table(mvm, lq_sta, initial_rate);
2907
2908         if (num_of_ant(initial_rate->ant) == 1)
2909                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
2910
2911         mvmsta = iwl_mvm_sta_from_mac80211(sta);
2912         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
2913
2914         if (num_of_ant(initial_rate->ant) == 1)
2915                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
2916
2917         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
2918
2919         /*
2920          * In case of low latency, tell the firwmare to leave a frame in the
2921          * Tx Fifo so that it can start a transaction in the same TxOP. This
2922          * basically allows the firmware to send bursts.
2923          */
2924         if (iwl_mvm_vif_low_latency(mvmvif)) {
2925                 lq_cmd->agg_frame_cnt_limit--;
2926
2927                 if (mvm->low_latency_agg_frame_limit)
2928                         lq_cmd->agg_frame_cnt_limit =
2929                                 min(lq_cmd->agg_frame_cnt_limit,
2930                                     mvm->low_latency_agg_frame_limit);
2931         }
2932
2933         if (mvmsta->vif->p2p)
2934                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
2935
2936         lq_cmd->agg_time_limit =
2937                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
2938 }
2939
2940 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2941 {
2942         return hw->priv;
2943 }
2944 /* rate scale requires free function to be implemented */
2945 static void rs_free(void *mvm_rate)
2946 {
2947         return;
2948 }
2949
2950 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2951                         void *mvm_sta)
2952 {
2953         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2954         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2955
2956         IWL_DEBUG_RATE(mvm, "enter\n");
2957         IWL_DEBUG_RATE(mvm, "leave\n");
2958 }
2959
2960 #ifdef CONFIG_MAC80211_DEBUGFS
2961 int rs_pretty_print_rate(char *buf, const u32 rate)
2962 {
2963
2964         char *type, *bw;
2965         u8 mcs = 0, nss = 0;
2966         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2967
2968         if (!(rate & RATE_MCS_HT_MSK) &&
2969             !(rate & RATE_MCS_VHT_MSK)) {
2970                 int index = iwl_hwrate_to_plcp_idx(rate);
2971
2972                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
2973                                rs_pretty_ant(ant),
2974                                index == IWL_RATE_INVALID ? "BAD" :
2975                                iwl_rate_mcs[index].mbps);
2976         }
2977
2978         if (rate & RATE_MCS_VHT_MSK) {
2979                 type = "VHT";
2980                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2981                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
2982                        >> RATE_VHT_MCS_NSS_POS) + 1;
2983         } else if (rate & RATE_MCS_HT_MSK) {
2984                 type = "HT";
2985                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
2986         } else {
2987                 type = "Unknown"; /* shouldn't happen */
2988         }
2989
2990         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2991         case RATE_MCS_CHAN_WIDTH_20:
2992                 bw = "20Mhz";
2993                 break;
2994         case RATE_MCS_CHAN_WIDTH_40:
2995                 bw = "40Mhz";
2996                 break;
2997         case RATE_MCS_CHAN_WIDTH_80:
2998                 bw = "80Mhz";
2999                 break;
3000         case RATE_MCS_CHAN_WIDTH_160:
3001                 bw = "160Mhz";
3002                 break;
3003         default:
3004                 bw = "BAD BW";
3005         }
3006
3007         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3008                        type, rs_pretty_ant(ant), bw, mcs, nss,
3009                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3010                        (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3011                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3012                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3013                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3014 }
3015
3016 /**
3017  * Program the device to use fixed rate for frame transmit
3018  * This is for debugging/testing only
3019  * once the device start use fixed rate, we need to reload the module
3020  * to being back the normal operation.
3021  */
3022 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3023                                 struct iwl_lq_sta *lq_sta)
3024 {
3025         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3026         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3027         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3028
3029         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3030                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3031
3032         if (lq_sta->pers.dbg_fixed_rate) {
3033                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3034                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3035         }
3036 }
3037
3038 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3039                         const char __user *user_buf, size_t count, loff_t *ppos)
3040 {
3041         struct iwl_lq_sta *lq_sta = file->private_data;
3042         struct iwl_mvm *mvm;
3043         char buf[64];
3044         size_t buf_size;
3045         u32 parsed_rate;
3046
3047         mvm = lq_sta->pers.drv;
3048         memset(buf, 0, sizeof(buf));
3049         buf_size = min(count, sizeof(buf) -  1);
3050         if (copy_from_user(buf, user_buf, buf_size))
3051                 return -EFAULT;
3052
3053         if (sscanf(buf, "%x", &parsed_rate) == 1)
3054                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3055         else
3056                 lq_sta->pers.dbg_fixed_rate = 0;
3057
3058         rs_program_fix_rate(mvm, lq_sta);
3059
3060         return count;
3061 }
3062
3063 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3064                         char __user *user_buf, size_t count, loff_t *ppos)
3065 {
3066         char *buff;
3067         int desc = 0;
3068         int i = 0;
3069         ssize_t ret;
3070
3071         struct iwl_lq_sta *lq_sta = file->private_data;
3072         struct iwl_mvm *mvm;
3073         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3074         struct rs_rate *rate = &tbl->rate;
3075         mvm = lq_sta->pers.drv;
3076         buff = kmalloc(2048, GFP_KERNEL);
3077         if (!buff)
3078                 return -ENOMEM;
3079
3080         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3081         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3082                         lq_sta->total_failed, lq_sta->total_success,
3083                         lq_sta->active_legacy_rate);
3084         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3085                         lq_sta->pers.dbg_fixed_rate);
3086         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3087             (mvm->fw->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3088             (mvm->fw->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3089             (mvm->fw->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3090         desc += sprintf(buff+desc, "lq type %s\n",
3091                         (is_legacy(rate)) ? "legacy" :
3092                         is_vht(rate) ? "VHT" : "HT");
3093         if (!is_legacy(rate)) {
3094                 desc += sprintf(buff+desc, " %s",
3095                    (is_siso(rate)) ? "SISO" : "MIMO2");
3096                    desc += sprintf(buff+desc, " %s",
3097                                    (is_ht20(rate)) ? "20MHz" :
3098                                    (is_ht40(rate)) ? "40MHz" :
3099                                    (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3100                    desc += sprintf(buff+desc, " %s %s %s\n",
3101                                    (rate->sgi) ? "SGI" : "NGI",
3102                                    (rate->ldpc) ? "LDPC" : "BCC",
3103                                    (lq_sta->is_agg) ? "AGG on" : "");
3104         }
3105         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3106                         lq_sta->last_rate_n_flags);
3107         desc += sprintf(buff+desc,
3108                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3109                         lq_sta->lq.flags,
3110                         lq_sta->lq.mimo_delim,
3111                         lq_sta->lq.single_stream_ant_msk,
3112                         lq_sta->lq.dual_stream_ant_msk);
3113
3114         desc += sprintf(buff+desc,
3115                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3116                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3117                         lq_sta->lq.agg_disable_start_th,
3118                         lq_sta->lq.agg_frame_cnt_limit);
3119
3120         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3121         desc += sprintf(buff+desc,
3122                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3123                         lq_sta->lq.initial_rate_index[0],
3124                         lq_sta->lq.initial_rate_index[1],
3125                         lq_sta->lq.initial_rate_index[2],
3126                         lq_sta->lq.initial_rate_index[3]);
3127
3128         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3129                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3130
3131                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3132                 desc += rs_pretty_print_rate(buff+desc, r);
3133         }
3134
3135         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3136         kfree(buff);
3137         return ret;
3138 }
3139
3140 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3141         .write = rs_sta_dbgfs_scale_table_write,
3142         .read = rs_sta_dbgfs_scale_table_read,
3143         .open = simple_open,
3144         .llseek = default_llseek,
3145 };
3146 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3147                         char __user *user_buf, size_t count, loff_t *ppos)
3148 {
3149         char *buff;
3150         int desc = 0;
3151         int i, j;
3152         ssize_t ret;
3153         struct iwl_scale_tbl_info *tbl;
3154         struct rs_rate *rate;
3155         struct iwl_lq_sta *lq_sta = file->private_data;
3156
3157         buff = kmalloc(1024, GFP_KERNEL);
3158         if (!buff)
3159                 return -ENOMEM;
3160
3161         for (i = 0; i < LQ_SIZE; i++) {
3162                 tbl = &(lq_sta->lq_info[i]);
3163                 rate = &tbl->rate;
3164                 desc += sprintf(buff+desc,
3165                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3166                                 "index=%d\n",
3167                                 lq_sta->active_tbl == i ? "*" : "x",
3168                                 rate->type,
3169                                 rate->sgi,
3170                                 is_ht20(rate) ? "20Mhz" :
3171                                 is_ht40(rate) ? "40Mhz" :
3172                                 is_ht80(rate) ? "80Mhz" : "ERR",
3173                                 rate->index);
3174                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3175                         desc += sprintf(buff+desc,
3176                                 "counter=%d success=%d %%=%d\n",
3177                                 tbl->win[j].counter,
3178                                 tbl->win[j].success_counter,
3179                                 tbl->win[j].success_ratio);
3180                 }
3181         }
3182         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3183         kfree(buff);
3184         return ret;
3185 }
3186
3187 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3188         .read = rs_sta_dbgfs_stats_table_read,
3189         .open = simple_open,
3190         .llseek = default_llseek,
3191 };
3192
3193 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3194                                               char __user *user_buf,
3195                                               size_t count, loff_t *ppos)
3196 {
3197         static const char * const column_name[] = {
3198                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3199                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3200                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3201                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3202                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3203                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3204                 [RS_COLUMN_MIMO2] = "MIMO2",
3205                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3206         };
3207
3208         static const char * const rate_name[] = {
3209                 [IWL_RATE_1M_INDEX] = "1M",
3210                 [IWL_RATE_2M_INDEX] = "2M",
3211                 [IWL_RATE_5M_INDEX] = "5.5M",
3212                 [IWL_RATE_11M_INDEX] = "11M",
3213                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3214                 [IWL_RATE_9M_INDEX] = "9M",
3215                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3216                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3217                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3218                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3219                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3220                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3221                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3222                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3223                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3224         };
3225
3226         char *buff, *pos, *endpos;
3227         int col, rate;
3228         ssize_t ret;
3229         struct iwl_lq_sta *lq_sta = file->private_data;
3230         struct rs_rate_stats *stats;
3231         static const size_t bufsz = 1024;
3232
3233         buff = kmalloc(bufsz, GFP_KERNEL);
3234         if (!buff)
3235                 return -ENOMEM;
3236
3237         pos = buff;
3238         endpos = pos + bufsz;
3239
3240         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3241         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3242                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3243         pos += scnprintf(pos, endpos - pos, "\n");
3244
3245         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3246                 pos += scnprintf(pos, endpos - pos,
3247                                  "%s,", column_name[col]);
3248
3249                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3250                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3251                         pos += scnprintf(pos, endpos - pos,
3252                                          "%llu/%llu,",
3253                                          stats->success,
3254                                          stats->total);
3255                 }
3256                 pos += scnprintf(pos, endpos - pos, "\n");
3257         }
3258
3259         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3260         kfree(buff);
3261         return ret;
3262 }
3263
3264 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3265                                                const char __user *user_buf,
3266                                                size_t count, loff_t *ppos)
3267 {
3268         struct iwl_lq_sta *lq_sta = file->private_data;
3269         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3270
3271         return count;
3272 }
3273
3274 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3275         .read = rs_sta_dbgfs_drv_tx_stats_read,
3276         .write = rs_sta_dbgfs_drv_tx_stats_write,
3277         .open = simple_open,
3278         .llseek = default_llseek,
3279 };
3280
3281 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3282 {
3283         struct iwl_lq_sta *lq_sta = mvm_sta;
3284         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3285                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
3286         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3287                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
3288         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3289                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3290         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3291                           &lq_sta->tx_agg_tid_en);
3292         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3293                           &lq_sta->pers.dbg_fixed_txp_reduction);
3294 }
3295
3296 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3297 {
3298 }
3299 #endif
3300
3301 /*
3302  * Initialization of rate scaling information is done by driver after
3303  * the station is added. Since mac80211 calls this function before a
3304  * station is added we ignore it.
3305  */
3306 static void rs_rate_init_stub(void *mvm_r,
3307                               struct ieee80211_supported_band *sband,
3308                               struct cfg80211_chan_def *chandef,
3309                               struct ieee80211_sta *sta, void *mvm_sta)
3310 {
3311 }
3312
3313 static const struct rate_control_ops rs_mvm_ops = {
3314         .name = RS_NAME,
3315         .tx_status = rs_mac80211_tx_status,
3316         .get_rate = rs_get_rate,
3317         .rate_init = rs_rate_init_stub,
3318         .alloc = rs_alloc,
3319         .free = rs_free,
3320         .alloc_sta = rs_alloc_sta,
3321         .free_sta = rs_free_sta,
3322         .rate_update = rs_rate_update,
3323 #ifdef CONFIG_MAC80211_DEBUGFS
3324         .add_sta_debugfs = rs_add_debugfs,
3325         .remove_sta_debugfs = rs_remove_debugfs,
3326 #endif
3327 };
3328
3329 int iwl_mvm_rate_control_register(void)
3330 {
3331         return ieee80211_rate_control_register(&rs_mvm_ops);
3332 }
3333
3334 void iwl_mvm_rate_control_unregister(void)
3335 {
3336         ieee80211_rate_control_unregister(&rs_mvm_ops);
3337 }
3338
3339 /**
3340  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3341  * Tx protection, according to this rquest and previous requests,
3342  * and send the LQ command.
3343  * @mvmsta: The station
3344  * @enable: Enable Tx protection?
3345  */
3346 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3347                           bool enable)
3348 {
3349         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3350
3351         lockdep_assert_held(&mvm->mutex);
3352
3353         if (enable) {
3354                 if (mvmsta->tx_protection == 0)
3355                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
3356                 mvmsta->tx_protection++;
3357         } else {
3358                 mvmsta->tx_protection--;
3359                 if (mvmsta->tx_protection == 0)
3360                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3361         }
3362
3363         return iwl_mvm_send_lq_cmd(mvm, lq, false);
3364 }