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 sk_buff *skb,
 381                                    struct ieee80211_sta *sta,
 382                                    struct iwl_lq_sta *lq_sta);
 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 /*
1011  * mac80211 sends us Tx status
1012  */
1013 static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
1014                          struct ieee80211_sta *sta, void *priv_sta,
1015                          struct sk_buff *skb)
1016 {
1017         int legacy_success;
1018         int retries;
1019         int mac_index, i;
1020         struct iwl_lq_sta *lq_sta = priv_sta;
1021         struct iwl_lq_cmd *table;
1022         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1023         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1024         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1025         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1026         enum mac80211_rate_control_flags mac_flags;
1027         u32 ucode_rate;
1028         struct rs_rate rate;
1029         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1030         u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1031
1032         /* Treat uninitialized rate scaling data same as non-existing. */
1033         if (!lq_sta) {
1034                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1035                 return;
1036         } else if (!lq_sta->pers.drv) {
1037                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1038                 return;
1039         }
1040
1041 #ifdef CONFIG_MAC80211_DEBUGFS
1042         /* Disable last tx check if we are debugging with fixed rate */
1043         if (lq_sta->pers.dbg_fixed_rate) {
1044                 IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n");
1045                 return;
1046         }
1047 #endif
1048         if (!ieee80211_is_data(hdr->frame_control) ||
1049             info->flags & IEEE80211_TX_CTL_NO_ACK)
1050                 return;
1051
1052         /* This packet was aggregated but doesn't carry status info */
1053         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1054             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1055                 return;
1056
1057         /*
1058          * Ignore this Tx frame response if its initial rate doesn't match
1059          * that of latest Link Quality command.  There may be stragglers
1060          * from a previous Link Quality command, but we're no longer interested
1061          * in those; they're either from the "active" mode while we're trying
1062          * to check "search" mode, or a prior "search" mode after we've moved
1063          * to a new "search" mode (which might become the new "active" mode).
1064          */
1065         table = &lq_sta->lq;
1066         ucode_rate = le32_to_cpu(table->rs_table[0]);
1067         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1068         if (info->band == IEEE80211_BAND_5GHZ)
1069                 rate.index -= IWL_FIRST_OFDM_RATE;
1070         mac_flags = info->status.rates[0].flags;
1071         mac_index = info->status.rates[0].idx;
1072         /* For HT packets, map MCS to PLCP */
1073         if (mac_flags & IEEE80211_TX_RC_MCS) {
1074                 /* Remove # of streams */
1075                 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1076                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1077                         mac_index++;
1078                 /*
1079                  * mac80211 HT index is always zero-indexed; we need to move
1080                  * HT OFDM rates after CCK rates in 2.4 GHz band
1081                  */
1082                 if (info->band == IEEE80211_BAND_2GHZ)
1083                         mac_index += IWL_FIRST_OFDM_RATE;
1084         } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1085                 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1086                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1087                         mac_index++;
1088         }
1089
1090         if (time_after(jiffies,
1091                        (unsigned long)(lq_sta->last_tx + RS_IDLE_TIMEOUT))) {
1092                 int tid;
1093                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1094                 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
1095                         ieee80211_stop_tx_ba_session(sta, tid);
1096
1097                 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
1098                 return;
1099         }
1100         lq_sta->last_tx = jiffies;
1101
1102         /* Here we actually compare this rate to the latest LQ command */
1103         if ((mac_index < 0) ||
1104             (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1105             (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1106             (rate.ant != info->status.antenna) ||
1107             (!!(ucode_rate & RATE_MCS_HT_MSK) !=
1108              !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
1109             (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
1110              !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
1111             (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
1112              !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
1113             (rate.index != mac_index)) {
1114                 IWL_DEBUG_RATE(mvm,
1115                                "initial rate %d does not match %d (0x%x)\n",
1116                                mac_index, rate.index, ucode_rate);
1117                 /*
1118                  * Since rates mis-match, the last LQ command may have failed.
1119                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1120                  * ... driver.
1121                  */
1122                 lq_sta->missed_rate_counter++;
1123                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
1124                         lq_sta->missed_rate_counter = 0;
1125                         IWL_DEBUG_RATE(mvm,
1126                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1127                                        lq_sta->rs_state);
1128                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1129                 }
1130                 /* Regardless, ignore this status info for outdated rate */
1131                 return;
1132         } else
1133                 /* Rate did match, so reset the missed_rate_counter */
1134                 lq_sta->missed_rate_counter = 0;
1135
1136         /* Figure out if rate scale algorithm is in active or search table */
1137         if (rs_rate_match(&rate,
1138                           &(lq_sta->lq_info[lq_sta->active_tbl].rate))) {
1139                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1140                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1141         } else if (rs_rate_match(&rate,
1142                          &lq_sta->lq_info[1 - lq_sta->active_tbl].rate)) {
1143                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1144                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1145         } else {
1146                 IWL_DEBUG_RATE(mvm,
1147                                "Neither active nor search matches tx rate\n");
1148                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1149                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1150                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1151                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1152                 rs_dump_rate(mvm, &rate, "ACTUAL");
1153
1154                 /*
1155                  * no matching table found, let's by-pass the data collection
1156                  * and continue to perform rate scale to find the rate table
1157                  */
1158                 rs_stay_in_table(lq_sta, true);
1159                 goto done;
1160         }
1161
1162         /*
1163          * Updating the frame history depends on whether packets were
1164          * aggregated.
1165          *
1166          * For aggregation, all packets were transmitted at the same rate, the
1167          * first index into rate scale table.
1168          */
1169         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1170                 ucode_rate = le32_to_cpu(table->rs_table[0]);
1171                 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1172                 rs_collect_tx_data(lq_sta, curr_tbl, rate.index,
1173                                    info->status.ampdu_len,
1174                                    info->status.ampdu_ack_len,
1175                                    reduced_txp);
1176
1177                 /* Update success/fail counts if not searching for new mode */
1178                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1179                         lq_sta->total_success += info->status.ampdu_ack_len;
1180                         lq_sta->total_failed += (info->status.ampdu_len -
1181                                         info->status.ampdu_ack_len);
1182                 }
1183         } else {
1184         /*
1185          * For legacy, update frame history with for each Tx retry.
1186          */
1187                 retries = info->status.rates[0].count - 1;
1188                 /* HW doesn't send more than 15 retries */
1189                 retries = min(retries, 15);
1190
1191                 /* The last transmission may have been successful */
1192                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1193                 /* Collect data for each rate used during failed TX attempts */
1194                 for (i = 0; i <= retries; ++i) {
1195                         ucode_rate = le32_to_cpu(table->rs_table[i]);
1196                         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1197                         /*
1198                          * Only collect stats if retried rate is in the same RS
1199                          * table as active/search.
1200                          */
1201                         if (rs_rate_match(&rate, &curr_tbl->rate))
1202                                 tmp_tbl = curr_tbl;
1203                         else if (rs_rate_match(&rate, &other_tbl->rate))
1204                                 tmp_tbl = other_tbl;
1205                         else
1206                                 continue;
1207
1208                         rs_collect_tx_data(lq_sta, tmp_tbl, rate.index, 1,
1209                                            i < retries ? 0 : legacy_success,
1210                                            reduced_txp);
1211                 }
1212
1213                 /* Update success/fail counts if not searching for new mode */
1214                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1215                         lq_sta->total_success += legacy_success;
1216                         lq_sta->total_failed += retries + (1 - legacy_success);
1217                 }
1218         }
1219         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1220         lq_sta->last_rate_n_flags = ucode_rate;
1221         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1222 done:
1223         /* See if there's a better rate or modulation mode to try. */
1224         if (sta && sta->supp_rates[sband->band])
1225                 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
1226 }
1227
1228 /*
1229  * Begin a period of staying with a selected modulation mode.
1230  * Set "stay_in_tbl" flag to prevent any mode switches.
1231  * Set frame tx success limits according to legacy vs. high-throughput,
1232  * and reset overall (spanning all rates) tx success history statistics.
1233  * These control how long we stay using same modulation mode before
1234  * searching for a new mode.
1235  */
1236 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1237                                  struct iwl_lq_sta *lq_sta)
1238 {
1239         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1240         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1241         if (is_legacy) {
1242                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1243                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1244                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1245         } else {
1246                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1247                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1248                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1249         }
1250         lq_sta->table_count = 0;
1251         lq_sta->total_failed = 0;
1252         lq_sta->total_success = 0;
1253         lq_sta->flush_timer = jiffies;
1254         lq_sta->visited_columns = 0;
1255 }
1256
1257 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1258                                    const struct rs_tx_column *column)
1259 {
1260         switch (column->mode) {
1261         case RS_LEGACY:
1262                 return lq_sta->max_legacy_rate_idx;
1263         case RS_SISO:
1264                 return lq_sta->max_siso_rate_idx;
1265         case RS_MIMO2:
1266                 return lq_sta->max_mimo2_rate_idx;
1267         default:
1268                 WARN_ON_ONCE(1);
1269         }
1270
1271         return lq_sta->max_legacy_rate_idx;
1272 }
1273
1274 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1275                                             const struct rs_tx_column *column,
1276                                             u32 bw)
1277 {
1278         /* Used to choose among HT tables */
1279         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1280
1281         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1282                          column->mode != RS_SISO &&
1283                          column->mode != RS_MIMO2))
1284                 return expected_tpt_legacy;
1285
1286         /* Legacy rates have only one table */
1287         if (column->mode == RS_LEGACY)
1288                 return expected_tpt_legacy;
1289
1290         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1291         /* Choose among many HT tables depending on number of streams
1292          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1293          * status */
1294         if (column->mode == RS_SISO) {
1295                 switch (bw) {
1296                 case RATE_MCS_CHAN_WIDTH_20:
1297                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1298                         break;
1299                 case RATE_MCS_CHAN_WIDTH_40:
1300                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1301                         break;
1302                 case RATE_MCS_CHAN_WIDTH_80:
1303                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1304                         break;
1305                 default:
1306                         WARN_ON_ONCE(1);
1307                 }
1308         } else if (column->mode == RS_MIMO2) {
1309                 switch (bw) {
1310                 case RATE_MCS_CHAN_WIDTH_20:
1311                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1312                         break;
1313                 case RATE_MCS_CHAN_WIDTH_40:
1314                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1315                         break;
1316                 case RATE_MCS_CHAN_WIDTH_80:
1317                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1318                         break;
1319                 default:
1320                         WARN_ON_ONCE(1);
1321                 }
1322         } else {
1323                 WARN_ON_ONCE(1);
1324         }
1325
1326         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1327                 return ht_tbl_pointer[0];
1328         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1329                 return ht_tbl_pointer[1];
1330         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1331                 return ht_tbl_pointer[2];
1332         else                                            /* AGG+SGI */
1333                 return ht_tbl_pointer[3];
1334 }
1335
1336 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1337                                       struct iwl_scale_tbl_info *tbl)
1338 {
1339         struct rs_rate *rate = &tbl->rate;
1340         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1341
1342         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1343 }
1344
1345 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1346                             struct iwl_lq_sta *lq_sta,
1347                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1348                             unsigned long rate_mask, s8 index)
1349 {
1350         struct iwl_scale_tbl_info *active_tbl =
1351             &(lq_sta->lq_info[lq_sta->active_tbl]);
1352         s32 success_ratio = active_tbl->win[index].success_ratio;
1353         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1354         const u16 *tpt_tbl = tbl->expected_tpt;
1355         u16 high_low;
1356         u32 target_tpt;
1357         int rate_idx;
1358
1359         if (success_ratio > RS_SR_NO_DECREASE) {
1360                 target_tpt = 100 * expected_current_tpt;
1361                 IWL_DEBUG_RATE(mvm,
1362                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1363                                success_ratio, target_tpt);
1364         } else {
1365                 target_tpt = lq_sta->last_tpt;
1366                 IWL_DEBUG_RATE(mvm,
1367                                "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1368                                success_ratio, target_tpt);
1369         }
1370
1371         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1372
1373         while (rate_idx != IWL_RATE_INVALID) {
1374                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1375                         break;
1376
1377                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1378                                                 tbl->rate.type);
1379
1380                 rate_idx = (high_low >> 8) & 0xff;
1381         }
1382
1383         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1384                        rate_idx, target_tpt,
1385                        rate_idx != IWL_RATE_INVALID ?
1386                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1387
1388         return rate_idx;
1389 }
1390
1391 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1392 {
1393         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1394                 return RATE_MCS_CHAN_WIDTH_80;
1395         else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1396                 return RATE_MCS_CHAN_WIDTH_40;
1397
1398         return RATE_MCS_CHAN_WIDTH_20;
1399 }
1400
1401 /*
1402  * Check whether we should continue using same modulation mode, or
1403  * begin search for a new mode, based on:
1404  * 1) # tx successes or failures while using this mode
1405  * 2) # times calling this function
1406  * 3) elapsed time in this mode (not used, for now)
1407  */
1408 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1409 {
1410         struct iwl_scale_tbl_info *tbl;
1411         int active_tbl;
1412         int flush_interval_passed = 0;
1413         struct iwl_mvm *mvm;
1414
1415         mvm = lq_sta->pers.drv;
1416         active_tbl = lq_sta->active_tbl;
1417
1418         tbl = &(lq_sta->lq_info[active_tbl]);
1419
1420         /* If we've been disallowing search, see if we should now allow it */
1421         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1422                 /* Elapsed time using current modulation mode */
1423                 if (lq_sta->flush_timer)
1424                         flush_interval_passed =
1425                                 time_after(jiffies,
1426                                            (unsigned long)(lq_sta->flush_timer +
1427                                                 RS_STAY_IN_COLUMN_TIMEOUT));
1428
1429                 /*
1430                  * Check if we should allow search for new modulation mode.
1431                  * If many frames have failed or succeeded, or we've used
1432                  * this same modulation for a long time, allow search, and
1433                  * reset history stats that keep track of whether we should
1434                  * allow a new search.  Also (below) reset all bitmaps and
1435                  * stats in active history.
1436                  */
1437                 if (force_search ||
1438                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1439                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1440                     ((!lq_sta->search_better_tbl) &&
1441                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1442                         IWL_DEBUG_RATE(mvm,
1443                                        "LQ: stay is expired %d %d %d\n",
1444                                      lq_sta->total_failed,
1445                                      lq_sta->total_success,
1446                                      flush_interval_passed);
1447
1448                         /* Allow search for new mode */
1449                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1450                         IWL_DEBUG_RATE(mvm,
1451                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1452                         lq_sta->total_failed = 0;
1453                         lq_sta->total_success = 0;
1454                         lq_sta->flush_timer = 0;
1455                         /* mark the current column as visited */
1456                         lq_sta->visited_columns = BIT(tbl->column);
1457                 /*
1458                  * Else if we've used this modulation mode enough repetitions
1459                  * (regardless of elapsed time or success/failure), reset
1460                  * history bitmaps and rate-specific stats for all rates in
1461                  * active table.
1462                  */
1463                 } else {
1464                         lq_sta->table_count++;
1465                         if (lq_sta->table_count >=
1466                             lq_sta->table_count_limit) {
1467                                 lq_sta->table_count = 0;
1468
1469                                 IWL_DEBUG_RATE(mvm,
1470                                                "LQ: stay in table clear win\n");
1471                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1472                         }
1473                 }
1474
1475                 /* If transitioning to allow "search", reset all history
1476                  * bitmaps and stats in active table (this will become the new
1477                  * "search" table). */
1478                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1479                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1480                 }
1481         }
1482 }
1483
1484 /*
1485  * setup rate table in uCode
1486  */
1487 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1488                                struct ieee80211_sta *sta,
1489                                struct iwl_lq_sta *lq_sta,
1490                                struct rs_rate *rate)
1491 {
1492         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
1493         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1494 }
1495
1496 static u8 rs_get_tid(struct iwl_lq_sta *lq_data,
1497                      struct ieee80211_hdr *hdr)
1498 {
1499         u8 tid = IWL_MAX_TID_COUNT;
1500
1501         if (ieee80211_is_data_qos(hdr->frame_control)) {
1502                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1503                 tid = qc[0] & 0xf;
1504         }
1505
1506         if (unlikely(tid > IWL_MAX_TID_COUNT))
1507                 tid = IWL_MAX_TID_COUNT;
1508
1509         return tid;
1510 }
1511
1512 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1513                                          struct iwl_lq_sta *lq_sta,
1514                                          struct ieee80211_sta *sta,
1515                                          struct iwl_scale_tbl_info *tbl)
1516 {
1517         int i, j, max_rate;
1518         enum rs_column next_col_id;
1519         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1520         const struct rs_tx_column *next_col;
1521         allow_column_func_t allow_func;
1522         u8 valid_ants = mvm->fw->valid_tx_ant;
1523         const u16 *expected_tpt_tbl;
1524         u16 tpt, max_expected_tpt;
1525
1526         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1527                 next_col_id = curr_col->next_columns[i];
1528
1529                 if (next_col_id == RS_COLUMN_INVALID)
1530                         continue;
1531
1532                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1533                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1534                                        next_col_id);
1535                         continue;
1536                 }
1537
1538                 next_col = &rs_tx_columns[next_col_id];
1539
1540                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1541                         IWL_DEBUG_RATE(mvm,
1542                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1543                                        next_col_id, valid_ants, next_col->ant);
1544                         continue;
1545                 }
1546
1547                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1548                         allow_func = next_col->checks[j];
1549                         if (allow_func && !allow_func(mvm, sta, tbl))
1550                                 break;
1551                 }
1552
1553                 if (j != MAX_COLUMN_CHECKS) {
1554                         IWL_DEBUG_RATE(mvm,
1555                                        "Skip column %d: not allowed (check %d failed)\n",
1556                                        next_col_id, j);
1557
1558                         continue;
1559                 }
1560
1561                 tpt = lq_sta->last_tpt / 100;
1562                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1563                                                      rs_bw_from_sta_bw(sta));
1564                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1565                         continue;
1566
1567                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1568                 if (WARN_ON_ONCE(max_rate == IWL_RATE_INVALID))
1569                         continue;
1570
1571                 max_expected_tpt = expected_tpt_tbl[max_rate];
1572                 if (tpt >= max_expected_tpt) {
1573                         IWL_DEBUG_RATE(mvm,
1574                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1575                                        next_col_id, max_expected_tpt, tpt);
1576                         continue;
1577                 }
1578
1579                 IWL_DEBUG_RATE(mvm,
1580                                "Found potential column %d. Max expected %d current %d\n",
1581                                next_col_id, max_expected_tpt, tpt);
1582                 break;
1583         }
1584
1585         if (i == MAX_NEXT_COLUMNS)
1586                 return RS_COLUMN_INVALID;
1587
1588         return next_col_id;
1589 }
1590
1591 static int rs_switch_to_column(struct iwl_mvm *mvm,
1592                                struct iwl_lq_sta *lq_sta,
1593                                struct ieee80211_sta *sta,
1594                                enum rs_column col_id)
1595 {
1596         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1597         struct iwl_scale_tbl_info *search_tbl =
1598                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1599         struct rs_rate *rate = &search_tbl->rate;
1600         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1601         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1602         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1603                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1604         unsigned long rate_mask = 0;
1605         u32 rate_idx = 0;
1606
1607         memcpy(search_tbl, tbl, sz);
1608
1609         rate->sgi = column->sgi;
1610         rate->ant = column->ant;
1611
1612         if (column->mode == RS_LEGACY) {
1613                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1614                         rate->type = LQ_LEGACY_A;
1615                 else
1616                         rate->type = LQ_LEGACY_G;
1617
1618                 rate_mask = lq_sta->active_legacy_rate;
1619         } else if (column->mode == RS_SISO) {
1620                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1621                 rate_mask = lq_sta->active_siso_rate;
1622         } else if (column->mode == RS_MIMO2) {
1623                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1624                 rate_mask = lq_sta->active_mimo2_rate;
1625         } else {
1626                 WARN_ON_ONCE("Bad column mode");
1627         }
1628
1629         rate->bw = rs_bw_from_sta_bw(sta);
1630         rate->ldpc = lq_sta->ldpc;
1631         search_tbl->column = col_id;
1632         rs_set_expected_tpt_table(lq_sta, search_tbl);
1633
1634         lq_sta->visited_columns |= BIT(col_id);
1635
1636         /* Get the best matching rate if we're changing modes. e.g.
1637          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1638          */
1639         if (curr_column->mode != column->mode) {
1640                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1641                                             rate_mask, rate->index);
1642
1643                 if ((rate_idx == IWL_RATE_INVALID) ||
1644                     !(BIT(rate_idx) & rate_mask)) {
1645                         IWL_DEBUG_RATE(mvm,
1646                                        "can not switch with index %d"
1647                                        " rate mask %lx\n",
1648                                        rate_idx, rate_mask);
1649
1650                         goto err;
1651                 }
1652
1653                 rate->index = rate_idx;
1654         }
1655
1656         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1657                        col_id, rate->index);
1658
1659         return 0;
1660
1661 err:
1662         rate->type = LQ_NONE;
1663         return -1;
1664 }
1665
1666 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1667                                          struct iwl_scale_tbl_info *tbl,
1668                                          s32 sr, int low, int high,
1669                                          int current_tpt,
1670                                          int low_tpt, int high_tpt)
1671 {
1672         enum rs_action action = RS_ACTION_STAY;
1673
1674         if ((sr <= RS_SR_FORCE_DECREASE) || (current_tpt == 0)) {
1675                 IWL_DEBUG_RATE(mvm,
1676                                "Decrease rate because of low SR\n");
1677                 return RS_ACTION_DOWNSCALE;
1678         }
1679
1680         if ((low_tpt == IWL_INVALID_VALUE) &&
1681             (high_tpt == IWL_INVALID_VALUE) &&
1682             (high != IWL_RATE_INVALID)) {
1683                 IWL_DEBUG_RATE(mvm,
1684                                "No data about high/low rates. Increase rate\n");
1685                 return RS_ACTION_UPSCALE;
1686         }
1687
1688         if ((high_tpt == IWL_INVALID_VALUE) &&
1689             (high != IWL_RATE_INVALID) &&
1690             (low_tpt != IWL_INVALID_VALUE) &&
1691             (low_tpt < current_tpt)) {
1692                 IWL_DEBUG_RATE(mvm,
1693                                "No data about high rate and low rate is worse. Increase rate\n");
1694                 return RS_ACTION_UPSCALE;
1695         }
1696
1697         if ((high_tpt != IWL_INVALID_VALUE) &&
1698             (high_tpt > current_tpt)) {
1699                 IWL_DEBUG_RATE(mvm,
1700                                "Higher rate is better. Increate rate\n");
1701                 return RS_ACTION_UPSCALE;
1702         }
1703
1704         if ((low_tpt != IWL_INVALID_VALUE) &&
1705             (high_tpt != IWL_INVALID_VALUE) &&
1706             (low_tpt < current_tpt) &&
1707             (high_tpt < current_tpt)) {
1708                 IWL_DEBUG_RATE(mvm,
1709                                "Both high and low are worse. Maintain rate\n");
1710                 return RS_ACTION_STAY;
1711         }
1712
1713         if ((low_tpt != IWL_INVALID_VALUE) &&
1714             (low_tpt > current_tpt)) {
1715                 IWL_DEBUG_RATE(mvm,
1716                                "Lower rate is better\n");
1717                 action = RS_ACTION_DOWNSCALE;
1718                 goto out;
1719         }
1720
1721         if ((low_tpt == IWL_INVALID_VALUE) &&
1722             (low != IWL_RATE_INVALID)) {
1723                 IWL_DEBUG_RATE(mvm,
1724                                "No data about lower rate\n");
1725                 action = RS_ACTION_DOWNSCALE;
1726                 goto out;
1727         }
1728
1729         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1730
1731 out:
1732         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1733                 if (sr >= RS_SR_NO_DECREASE) {
1734                         IWL_DEBUG_RATE(mvm,
1735                                        "SR is above NO DECREASE. Avoid downscale\n");
1736                         action = RS_ACTION_STAY;
1737                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1738                         IWL_DEBUG_RATE(mvm,
1739                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1740                         action = RS_ACTION_STAY;
1741                 } else {
1742                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1743                 }
1744         }
1745
1746         return action;
1747 }
1748
1749 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1750                                 int *weaker, int *stronger)
1751 {
1752         *weaker = index + TPC_TX_POWER_STEP;
1753         if (*weaker > TPC_MAX_REDUCTION)
1754                 *weaker = TPC_INVALID;
1755
1756         *stronger = index - TPC_TX_POWER_STEP;
1757         if (*stronger < 0)
1758                 *stronger = TPC_INVALID;
1759 }
1760
1761 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1762                            struct rs_rate *rate, enum ieee80211_band band)
1763 {
1764         int index = rate->index;
1765         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1766         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1767                                 !vif->bss_conf.ps);
1768
1769         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1770                        cam, sta_ps_disabled);
1771         /*
1772          * allow tpc only if power management is enabled, or bt coex
1773          * activity grade allows it and we are on 2.4Ghz.
1774          */
1775         if ((cam || sta_ps_disabled) &&
1776             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1777                 return false;
1778
1779         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1780         if (is_legacy(rate))
1781                 return index == IWL_RATE_54M_INDEX;
1782         if (is_ht(rate))
1783                 return index == IWL_RATE_MCS_7_INDEX;
1784         if (is_vht(rate))
1785                 return index == IWL_RATE_MCS_7_INDEX ||
1786                        index == IWL_RATE_MCS_8_INDEX ||
1787                        index == IWL_RATE_MCS_9_INDEX;
1788
1789         WARN_ON_ONCE(1);
1790         return false;
1791 }
1792
1793 enum tpc_action {
1794         TPC_ACTION_STAY,
1795         TPC_ACTION_DECREASE,
1796         TPC_ACTION_INCREASE,
1797         TPC_ACTION_NO_RESTIRCTION,
1798 };
1799
1800 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1801                                          s32 sr, int weak, int strong,
1802                                          int current_tpt,
1803                                          int weak_tpt, int strong_tpt)
1804 {
1805         /* stay until we have valid tpt */
1806         if (current_tpt == IWL_INVALID_VALUE) {
1807                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1808                 return TPC_ACTION_STAY;
1809         }
1810
1811         /* Too many failures, increase txp */
1812         if (sr <= TPC_SR_FORCE_INCREASE || current_tpt == 0) {
1813                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1814                 return TPC_ACTION_NO_RESTIRCTION;
1815         }
1816
1817         /* try decreasing first if applicable */
1818         if (weak != TPC_INVALID) {
1819                 if (weak_tpt == IWL_INVALID_VALUE &&
1820                     (strong_tpt == IWL_INVALID_VALUE ||
1821                      current_tpt >= strong_tpt)) {
1822                         IWL_DEBUG_RATE(mvm,
1823                                        "no weak txp measurement. decrease txp\n");
1824                         return TPC_ACTION_DECREASE;
1825                 }
1826
1827                 if (weak_tpt > current_tpt) {
1828                         IWL_DEBUG_RATE(mvm,
1829                                        "lower txp has better tpt. decrease txp\n");
1830                         return TPC_ACTION_DECREASE;
1831                 }
1832         }
1833
1834         /* next, increase if needed */
1835         if (sr < TPC_SR_NO_INCREASE && strong != TPC_INVALID) {
1836                 if (weak_tpt == IWL_INVALID_VALUE &&
1837                     strong_tpt != IWL_INVALID_VALUE &&
1838                     current_tpt < strong_tpt) {
1839                         IWL_DEBUG_RATE(mvm,
1840                                        "higher txp has better tpt. increase txp\n");
1841                         return TPC_ACTION_INCREASE;
1842                 }
1843
1844                 if (weak_tpt < current_tpt &&
1845                     (strong_tpt == IWL_INVALID_VALUE ||
1846                      strong_tpt > current_tpt)) {
1847                         IWL_DEBUG_RATE(mvm,
1848                                        "lower txp has worse tpt. increase txp\n");
1849                         return TPC_ACTION_INCREASE;
1850                 }
1851         }
1852
1853         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1854         return TPC_ACTION_STAY;
1855 }
1856
1857 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1858                            struct ieee80211_sta *sta,
1859                            struct iwl_lq_sta *lq_sta,
1860                            struct iwl_scale_tbl_info *tbl)
1861 {
1862         struct iwl_mvm_sta *mvm_sta = (void *)sta->drv_priv;
1863         struct ieee80211_vif *vif = mvm_sta->vif;
1864         struct ieee80211_chanctx_conf *chanctx_conf;
1865         enum ieee80211_band band;
1866         struct iwl_rate_scale_data *window;
1867         struct rs_rate *rate = &tbl->rate;
1868         enum tpc_action action;
1869         s32 sr;
1870         u8 cur = lq_sta->lq.reduced_tpc;
1871         int current_tpt;
1872         int weak, strong;
1873         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1874
1875 #ifdef CONFIG_MAC80211_DEBUGFS
1876         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1877                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1878                                lq_sta->pers.dbg_fixed_txp_reduction);
1879                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1880                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1881         }
1882 #endif
1883
1884         rcu_read_lock();
1885         chanctx_conf = rcu_dereference(vif->chanctx_conf);
1886         if (WARN_ON(!chanctx_conf))
1887                 band = IEEE80211_NUM_BANDS;
1888         else
1889                 band = chanctx_conf->def.chan->band;
1890         rcu_read_unlock();
1891
1892         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1893                 IWL_DEBUG_RATE(mvm,
1894                                "tpc is not allowed. remove txp restrictions\n");
1895                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1896                 return cur != TPC_NO_REDUCTION;
1897         }
1898
1899         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1900
1901         /* Collect measured throughputs for current and adjacent rates */
1902         window = tbl->tpc_win;
1903         sr = window[cur].success_ratio;
1904         current_tpt = window[cur].average_tpt;
1905         if (weak != TPC_INVALID)
1906                 weak_tpt = window[weak].average_tpt;
1907         if (strong != TPC_INVALID)
1908                 strong_tpt = window[strong].average_tpt;
1909
1910         IWL_DEBUG_RATE(mvm,
1911                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1912                        cur, current_tpt, sr, weak, strong,
1913                        weak_tpt, strong_tpt);
1914
1915         action = rs_get_tpc_action(mvm, sr, weak, strong,
1916                                    current_tpt, weak_tpt, strong_tpt);
1917
1918         /* override actions if we are on the edge */
1919         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
1920                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
1921                 action = TPC_ACTION_STAY;
1922         } else if (strong == TPC_INVALID &&
1923                    (action == TPC_ACTION_INCREASE ||
1924                     action == TPC_ACTION_NO_RESTIRCTION)) {
1925                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
1926                 action = TPC_ACTION_STAY;
1927         }
1928
1929         switch (action) {
1930         case TPC_ACTION_DECREASE:
1931                 lq_sta->lq.reduced_tpc = weak;
1932                 return true;
1933         case TPC_ACTION_INCREASE:
1934                 lq_sta->lq.reduced_tpc = strong;
1935                 return true;
1936         case TPC_ACTION_NO_RESTIRCTION:
1937                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1938                 return true;
1939         case TPC_ACTION_STAY:
1940                 /* do nothing */
1941                 break;
1942         }
1943         return false;
1944 }
1945
1946 /*
1947  * Do rate scaling and search for new modulation mode.
1948  */
1949 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1950                                   struct sk_buff *skb,
1951                                   struct ieee80211_sta *sta,
1952                                   struct iwl_lq_sta *lq_sta)
1953 {
1954         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1955         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1956         int low = IWL_RATE_INVALID;
1957         int high = IWL_RATE_INVALID;
1958         int index;
1959         struct iwl_rate_scale_data *window = NULL;
1960         int current_tpt = IWL_INVALID_VALUE;
1961         int low_tpt = IWL_INVALID_VALUE;
1962         int high_tpt = IWL_INVALID_VALUE;
1963         u32 fail_count;
1964         enum rs_action scale_action = RS_ACTION_STAY;
1965         u16 rate_mask;
1966         u8 update_lq = 0;
1967         struct iwl_scale_tbl_info *tbl, *tbl1;
1968         u8 active_tbl = 0;
1969         u8 done_search = 0;
1970         u16 high_low;
1971         s32 sr;
1972         u8 tid = IWL_MAX_TID_COUNT;
1973         u8 prev_agg = lq_sta->is_agg;
1974         struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
1975         struct iwl_mvm_tid_data *tid_data;
1976         struct rs_rate *rate;
1977
1978         /* Send management frames and NO_ACK data using lowest rate. */
1979         /* TODO: this could probably be improved.. */
1980         if (!ieee80211_is_data(hdr->frame_control) ||
1981             info->flags & IEEE80211_TX_CTL_NO_ACK)
1982                 return;
1983
1984         tid = rs_get_tid(lq_sta, hdr);
1985         if ((tid != IWL_MAX_TID_COUNT) &&
1986             (lq_sta->tx_agg_tid_en & (1 << tid))) {
1987                 tid_data = &sta_priv->tid_data[tid];
1988                 if (tid_data->state == IWL_AGG_OFF)
1989                         lq_sta->is_agg = 0;
1990                 else
1991                         lq_sta->is_agg = 1;
1992         } else {
1993                 lq_sta->is_agg = 0;
1994         }
1995
1996         /*
1997          * Select rate-scale / modulation-mode table to work with in
1998          * the rest of this function:  "search" if searching for better
1999          * modulation mode, or "active" if doing rate scaling within a mode.
2000          */
2001         if (!lq_sta->search_better_tbl)
2002                 active_tbl = lq_sta->active_tbl;
2003         else
2004                 active_tbl = 1 - lq_sta->active_tbl;
2005
2006         tbl = &(lq_sta->lq_info[active_tbl]);
2007         rate = &tbl->rate;
2008
2009         if (prev_agg != lq_sta->is_agg) {
2010                 IWL_DEBUG_RATE(mvm,
2011                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2012                                prev_agg, lq_sta->is_agg);
2013                 rs_set_expected_tpt_table(lq_sta, tbl);
2014                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2015         }
2016
2017         /* current tx rate */
2018         index = lq_sta->last_txrate_idx;
2019
2020         /* rates available for this association, and for modulation mode */
2021         rate_mask = rs_get_supported_rates(lq_sta, rate);
2022
2023         if (!(BIT(index) & rate_mask)) {
2024                 IWL_ERR(mvm, "Current Rate is not valid\n");
2025                 if (lq_sta->search_better_tbl) {
2026                         /* revert to active table if search table is not valid*/
2027                         rate->type = LQ_NONE;
2028                         lq_sta->search_better_tbl = 0;
2029                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2030                         rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2031                 }
2032                 return;
2033         }
2034
2035         /* Get expected throughput table and history window for current rate */
2036         if (!tbl->expected_tpt) {
2037                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2038                 return;
2039         }
2040
2041         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2042         window = &(tbl->win[index]);
2043
2044         /*
2045          * If there is not enough history to calculate actual average
2046          * throughput, keep analyzing results of more tx frames, without
2047          * changing rate or mode (bypass most of the rest of this function).
2048          * Set up new rate table in uCode only if old rate is not supported
2049          * in current association (use new rate found above).
2050          */
2051         fail_count = window->counter - window->success_counter;
2052         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2053             (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2054                 IWL_DEBUG_RATE(mvm,
2055                                "(%s: %d): Test Window: succ %d total %d\n",
2056                                rs_pretty_lq_type(rate->type),
2057                                index, window->success_counter, window->counter);
2058
2059                 /* Can't calculate this yet; not enough history */
2060                 window->average_tpt = IWL_INVALID_VALUE;
2061
2062                 /* Should we stay with this modulation mode,
2063                  * or search for a new one? */
2064                 rs_stay_in_table(lq_sta, false);
2065
2066                 goto out;
2067         }
2068         /* Else we have enough samples; calculate estimate of
2069          * actual average throughput */
2070         if (window->average_tpt != ((window->success_ratio *
2071                         tbl->expected_tpt[index] + 64) / 128)) {
2072                 window->average_tpt = ((window->success_ratio *
2073                                         tbl->expected_tpt[index] + 64) / 128);
2074         }
2075
2076         /* If we are searching for better modulation mode, check success. */
2077         if (lq_sta->search_better_tbl) {
2078                 /* If good success, continue using the "search" mode;
2079                  * no need to send new link quality command, since we're
2080                  * continuing to use the setup that we've been trying. */
2081                 if (window->average_tpt > lq_sta->last_tpt) {
2082                         IWL_DEBUG_RATE(mvm,
2083                                        "SWITCHING TO NEW TABLE SR: %d "
2084                                        "cur-tpt %d old-tpt %d\n",
2085                                        window->success_ratio,
2086                                        window->average_tpt,
2087                                        lq_sta->last_tpt);
2088
2089                         /* Swap tables; "search" becomes "active" */
2090                         lq_sta->active_tbl = active_tbl;
2091                         current_tpt = window->average_tpt;
2092                 /* Else poor success; go back to mode in "active" table */
2093                 } else {
2094                         IWL_DEBUG_RATE(mvm,
2095                                        "GOING BACK TO THE OLD TABLE: SR %d "
2096                                        "cur-tpt %d old-tpt %d\n",
2097                                        window->success_ratio,
2098                                        window->average_tpt,
2099                                        lq_sta->last_tpt);
2100
2101                         /* Nullify "search" table */
2102                         rate->type = LQ_NONE;
2103
2104                         /* Revert to "active" table */
2105                         active_tbl = lq_sta->active_tbl;
2106                         tbl = &(lq_sta->lq_info[active_tbl]);
2107
2108                         /* Revert to "active" rate and throughput info */
2109                         index = tbl->rate.index;
2110                         current_tpt = lq_sta->last_tpt;
2111
2112                         /* Need to set up a new rate table in uCode */
2113                         update_lq = 1;
2114                 }
2115
2116                 /* Either way, we've made a decision; modulation mode
2117                  * search is done, allow rate adjustment next time. */
2118                 lq_sta->search_better_tbl = 0;
2119                 done_search = 1;        /* Don't switch modes below! */
2120                 goto lq_update;
2121         }
2122
2123         /* (Else) not in search of better modulation mode, try for better
2124          * starting rate, while staying in this mode. */
2125         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2126         low = high_low & 0xff;
2127         high = (high_low >> 8) & 0xff;
2128
2129         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2130
2131         sr = window->success_ratio;
2132
2133         /* Collect measured throughputs for current and adjacent rates */
2134         current_tpt = window->average_tpt;
2135         if (low != IWL_RATE_INVALID)
2136                 low_tpt = tbl->win[low].average_tpt;
2137         if (high != IWL_RATE_INVALID)
2138                 high_tpt = tbl->win[high].average_tpt;
2139
2140         IWL_DEBUG_RATE(mvm,
2141                        "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2142                        rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2143                        low, high, low_tpt, high_tpt);
2144
2145         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2146                                           current_tpt, low_tpt, high_tpt);
2147
2148         /* Force a search in case BT doesn't like us being in MIMO */
2149         if (is_mimo(rate) &&
2150             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2151                 IWL_DEBUG_RATE(mvm,
2152                                "BT Coex forbids MIMO. Search for new config\n");
2153                 rs_stay_in_table(lq_sta, true);
2154                 goto lq_update;
2155         }
2156
2157         switch (scale_action) {
2158         case RS_ACTION_DOWNSCALE:
2159                 /* Decrease starting rate, update uCode's rate table */
2160                 if (low != IWL_RATE_INVALID) {
2161                         update_lq = 1;
2162                         index = low;
2163                 } else {
2164                         IWL_DEBUG_RATE(mvm,
2165                                        "At the bottom rate. Can't decrease\n");
2166                 }
2167
2168                 break;
2169         case RS_ACTION_UPSCALE:
2170                 /* Increase starting rate, update uCode's rate table */
2171                 if (high != IWL_RATE_INVALID) {
2172                         update_lq = 1;
2173                         index = high;
2174                 } else {
2175                         IWL_DEBUG_RATE(mvm,
2176                                        "At the top rate. Can't increase\n");
2177                 }
2178
2179                 break;
2180         case RS_ACTION_STAY:
2181                 /* No change */
2182                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2183                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2184                 break;
2185         default:
2186                 break;
2187         }
2188
2189 lq_update:
2190         /* Replace uCode's rate table for the destination station. */
2191         if (update_lq) {
2192                 tbl->rate.index = index;
2193                 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2194         }
2195
2196         rs_stay_in_table(lq_sta, false);
2197
2198         /*
2199          * Search for new modulation mode if we're:
2200          * 1)  Not changing rates right now
2201          * 2)  Not just finishing up a search
2202          * 3)  Allowing a new search
2203          */
2204         if (!update_lq && !done_search &&
2205             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2206             && window->counter) {
2207                 enum rs_column next_column;
2208
2209                 /* Save current throughput to compare with "search" throughput*/
2210                 lq_sta->last_tpt = current_tpt;
2211
2212                 IWL_DEBUG_RATE(mvm,
2213                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2214                                update_lq, done_search, lq_sta->rs_state,
2215                                window->counter);
2216
2217                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2218                 if (next_column != RS_COLUMN_INVALID) {
2219                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2220                                                       next_column);
2221                         if (!ret)
2222                                 lq_sta->search_better_tbl = 1;
2223                 } else {
2224                         IWL_DEBUG_RATE(mvm,
2225                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2226                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2227                 }
2228
2229                 /* If new "search" mode was selected, set up in uCode table */
2230                 if (lq_sta->search_better_tbl) {
2231                         /* Access the "search" table, clear its history. */
2232                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2233                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2234
2235                         /* Use new "search" start rate */
2236                         index = tbl->rate.index;
2237
2238                         rs_dump_rate(mvm, &tbl->rate,
2239                                      "Switch to SEARCH TABLE:");
2240                         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
2241                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2242                 } else {
2243                         done_search = 1;
2244                 }
2245         }
2246
2247         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2248                 /* If the "active" (non-search) mode was legacy,
2249                  * and we've tried switching antennas,
2250                  * but we haven't been able to try HT modes (not available),
2251                  * stay with best antenna legacy modulation for a while
2252                  * before next round of mode comparisons. */
2253                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2254                 if (is_legacy(&tbl1->rate)) {
2255                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2256
2257                         if (tid != IWL_MAX_TID_COUNT) {
2258                                 tid_data = &sta_priv->tid_data[tid];
2259                                 if (tid_data->state != IWL_AGG_OFF) {
2260                                         IWL_DEBUG_RATE(mvm,
2261                                                        "Stop aggregation on tid %d\n",
2262                                                        tid);
2263                                         ieee80211_stop_tx_ba_session(sta, tid);
2264                                 }
2265                         }
2266                         rs_set_stay_in_table(mvm, 1, lq_sta);
2267                 } else {
2268                 /* If we're in an HT mode, and all 3 mode switch actions
2269                  * have been tried and compared, stay in this best modulation
2270                  * mode for a while before next round of mode comparisons. */
2271                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2272                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2273                             (tid != IWL_MAX_TID_COUNT)) {
2274                                 tid_data = &sta_priv->tid_data[tid];
2275                                 if (tid_data->state == IWL_AGG_OFF) {
2276                                         IWL_DEBUG_RATE(mvm,
2277                                                        "try to aggregate tid %d\n",
2278                                                        tid);
2279                                         rs_tl_turn_on_agg(mvm, tid,
2280                                                           lq_sta, sta);
2281                                 }
2282                         }
2283                         rs_set_stay_in_table(mvm, 0, lq_sta);
2284                 }
2285         }
2286
2287 out:
2288         lq_sta->last_txrate_idx = index;
2289 }
2290
2291 /**
2292  * rs_initialize_lq - Initialize a station's hardware rate table
2293  *
2294  * The uCode's station table contains a table of fallback rates
2295  * for automatic fallback during transmission.
2296  *
2297  * NOTE: This sets up a default set of values.  These will be replaced later
2298  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2299  *       rc80211_simple.
2300  *
2301  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2302  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2303  *       which requires station table entry to exist).
2304  */
2305 static void rs_initialize_lq(struct iwl_mvm *mvm,
2306                              struct ieee80211_sta *sta,
2307                              struct iwl_lq_sta *lq_sta,
2308                              enum ieee80211_band band,
2309                              bool init)
2310 {
2311         struct iwl_scale_tbl_info *tbl;
2312         struct rs_rate *rate;
2313         int i;
2314         u8 active_tbl = 0;
2315         u8 valid_tx_ant;
2316
2317         if (!sta || !lq_sta)
2318                 return;
2319
2320         i = lq_sta->last_txrate_idx;
2321
2322         valid_tx_ant = mvm->fw->valid_tx_ant;
2323
2324         if (!lq_sta->search_better_tbl)
2325                 active_tbl = lq_sta->active_tbl;
2326         else
2327                 active_tbl = 1 - lq_sta->active_tbl;
2328
2329         tbl = &(lq_sta->lq_info[active_tbl]);
2330         rate = &tbl->rate;
2331
2332         if ((i < 0) || (i >= IWL_RATE_COUNT))
2333                 i = 0;
2334
2335         rate->index = i;
2336         rate->ant = first_antenna(valid_tx_ant);
2337         rate->sgi = false;
2338         rate->ldpc = false;
2339         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2340         if (band == IEEE80211_BAND_5GHZ)
2341                 rate->type = LQ_LEGACY_A;
2342         else
2343                 rate->type = LQ_LEGACY_G;
2344
2345         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2346         if (rate->ant == ANT_A)
2347                 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2348         else
2349                 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2350
2351         rs_set_expected_tpt_table(lq_sta, tbl);
2352         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2353         /* TODO restore station should remember the lq cmd */
2354         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2355 }
2356
2357 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2358                         struct ieee80211_tx_rate_control *txrc)
2359 {
2360         struct sk_buff *skb = txrc->skb;
2361         struct iwl_op_mode *op_mode __maybe_unused =
2362                         (struct iwl_op_mode *)mvm_r;
2363         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2364         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2365         struct iwl_lq_sta *lq_sta = mvm_sta;
2366
2367         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2368
2369         /* Treat uninitialized rate scaling data same as non-existing. */
2370         if (lq_sta && !lq_sta->pers.drv) {
2371                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2372                 mvm_sta = NULL;
2373         }
2374
2375         /* Send management frames and NO_ACK data using lowest rate. */
2376         if (rate_control_send_low(sta, mvm_sta, txrc))
2377                 return;
2378
2379         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2380                                   info->band, &info->control.rates[0]);
2381
2382         info->control.rates[0].count = 1;
2383 }
2384
2385 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2386                           gfp_t gfp)
2387 {
2388         struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2389         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2390         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2391         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2392
2393         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2394
2395         lq_sta->pers.drv = mvm;
2396 #ifdef CONFIG_MAC80211_DEBUGFS
2397         lq_sta->pers.dbg_fixed_rate = 0;
2398         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2399 #endif
2400
2401         return &sta_priv->lq_sta;
2402 }
2403
2404 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2405                                        int nss)
2406 {
2407         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2408                 (0x3 << (2 * (nss - 1)));
2409         rx_mcs >>= (2 * (nss - 1));
2410
2411         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2412                 return IWL_RATE_MCS_7_INDEX;
2413         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2414                 return IWL_RATE_MCS_8_INDEX;
2415         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2416                 return IWL_RATE_MCS_9_INDEX;
2417
2418         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2419         return -1;
2420 }
2421
2422 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2423                                      struct ieee80211_sta_vht_cap *vht_cap,
2424                                      struct iwl_lq_sta *lq_sta)
2425 {
2426         int i;
2427         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2428
2429         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2430                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2431                         if (i == IWL_RATE_9M_INDEX)
2432                                 continue;
2433
2434                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2435                         if (i == IWL_RATE_MCS_9_INDEX &&
2436                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2437                                 continue;
2438
2439                         lq_sta->active_siso_rate |= BIT(i);
2440                 }
2441         }
2442
2443         if (sta->rx_nss < 2)
2444                 return;
2445
2446         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2447         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2448                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2449                         if (i == IWL_RATE_9M_INDEX)
2450                                 continue;
2451
2452                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2453                         if (i == IWL_RATE_MCS_9_INDEX &&
2454                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2455                                 continue;
2456
2457                         lq_sta->active_mimo2_rate |= BIT(i);
2458                 }
2459         }
2460 }
2461
2462 #ifdef CONFIG_IWLWIFI_DEBUGFS
2463 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm,
2464                                       struct iwl_mvm_frame_stats *stats)
2465 {
2466         spin_lock_bh(&mvm->drv_stats_lock);
2467         memset(stats, 0, sizeof(*stats));
2468         spin_unlock_bh(&mvm->drv_stats_lock);
2469 }
2470
2471 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm,
2472                                 struct iwl_mvm_frame_stats *stats,
2473                                 u32 rate, bool agg)
2474 {
2475         u8 nss = 0, mcs = 0;
2476
2477         spin_lock(&mvm->drv_stats_lock);
2478
2479         if (agg)
2480                 stats->agg_frames++;
2481
2482         stats->success_frames++;
2483
2484         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2485         case RATE_MCS_CHAN_WIDTH_20:
2486                 stats->bw_20_frames++;
2487                 break;
2488         case RATE_MCS_CHAN_WIDTH_40:
2489                 stats->bw_40_frames++;
2490                 break;
2491         case RATE_MCS_CHAN_WIDTH_80:
2492                 stats->bw_80_frames++;
2493                 break;
2494         default:
2495                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2496         }
2497
2498         if (rate & RATE_MCS_HT_MSK) {
2499                 stats->ht_frames++;
2500                 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2501                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2502         } else if (rate & RATE_MCS_VHT_MSK) {
2503                 stats->vht_frames++;
2504                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2505                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2506                        RATE_VHT_MCS_NSS_POS) + 1;
2507         } else {
2508                 stats->legacy_frames++;
2509         }
2510
2511         if (nss == 1)
2512                 stats->siso_frames++;
2513         else if (nss == 2)
2514                 stats->mimo2_frames++;
2515
2516         if (rate & RATE_MCS_SGI_MSK)
2517                 stats->sgi_frames++;
2518         else
2519                 stats->ngi_frames++;
2520
2521         stats->last_rates[stats->last_frame_idx] = rate;
2522         stats->last_frame_idx = (stats->last_frame_idx + 1) %
2523                 ARRAY_SIZE(stats->last_rates);
2524
2525         spin_unlock(&mvm->drv_stats_lock);
2526 }
2527 #endif
2528
2529 /*
2530  * Called after adding a new station to initialize rate scaling
2531  */
2532 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2533                           enum ieee80211_band band, bool init)
2534 {
2535         int i, j;
2536         struct ieee80211_hw *hw = mvm->hw;
2537         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2538         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2539         struct iwl_mvm_sta *sta_priv;
2540         struct iwl_lq_sta *lq_sta;
2541         struct ieee80211_supported_band *sband;
2542         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2543
2544         sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2545         lq_sta = &sta_priv->lq_sta;
2546
2547         /* clear all non-persistent lq data */
2548         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2549
2550         sband = hw->wiphy->bands[band];
2551
2552         lq_sta->lq.sta_id = sta_priv->sta_id;
2553
2554         for (j = 0; j < LQ_SIZE; j++)
2555                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2556
2557         lq_sta->flush_timer = 0;
2558         lq_sta->last_tx = jiffies;
2559
2560         IWL_DEBUG_RATE(mvm,
2561                        "LQ: *** rate scale station global init for station %d ***\n",
2562                        sta_priv->sta_id);
2563         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2564          * the lowest or the highest rate.. Could consider using RSSI from
2565          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2566          * after assoc.. */
2567
2568         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2569         lq_sta->band = sband->band;
2570         /*
2571          * active legacy rates as per supported rates bitmap
2572          */
2573         supp = sta->supp_rates[sband->band];
2574         lq_sta->active_legacy_rate = 0;
2575         for_each_set_bit(i, &supp, BITS_PER_LONG)
2576                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2577
2578         /* TODO: should probably account for rx_highest for both HT/VHT */
2579         if (!vht_cap || !vht_cap->vht_supported) {
2580                 /* active_siso_rate mask includes 9 MBits (bit 5),
2581                  * and CCK (bits 0-3), supp_rates[] does not;
2582                  * shift to convert format, force 9 MBits off.
2583                  */
2584                 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2585                 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2586                 lq_sta->active_siso_rate &= ~((u16)0x2);
2587                 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2588
2589                 /* Same here */
2590                 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2591                 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2592                 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2593                 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2594
2595                 lq_sta->is_vht = false;
2596                 if (mvm->cfg->ht_params->ldpc &&
2597                     (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2598                         lq_sta->ldpc = true;
2599         } else {
2600                 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2601                 lq_sta->is_vht = true;
2602
2603                 if (mvm->cfg->ht_params->ldpc &&
2604                     (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2605                         lq_sta->ldpc = true;
2606         }
2607
2608         lq_sta->max_legacy_rate_idx = find_last_bit(&lq_sta->active_legacy_rate,
2609                                                     BITS_PER_LONG);
2610         lq_sta->max_siso_rate_idx = find_last_bit(&lq_sta->active_siso_rate,
2611                                                   BITS_PER_LONG);
2612         lq_sta->max_mimo2_rate_idx = find_last_bit(&lq_sta->active_mimo2_rate,
2613                                                    BITS_PER_LONG);
2614
2615         IWL_DEBUG_RATE(mvm,
2616                        "RATE MASK: LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d\n",
2617                        lq_sta->active_legacy_rate,
2618                        lq_sta->active_siso_rate,
2619                        lq_sta->active_mimo2_rate,
2620                        lq_sta->is_vht, lq_sta->ldpc);
2621         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2622                        lq_sta->max_legacy_rate_idx,
2623                        lq_sta->max_siso_rate_idx,
2624                        lq_sta->max_mimo2_rate_idx);
2625
2626         /* These values will be overridden later */
2627         lq_sta->lq.single_stream_ant_msk =
2628                 first_antenna(mvm->fw->valid_tx_ant);
2629         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2630
2631         /* as default allow aggregation for all tids */
2632         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2633
2634         /* Set last_txrate_idx to lowest rate */
2635         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2636         if (sband->band == IEEE80211_BAND_5GHZ)
2637                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2638         lq_sta->is_agg = 0;
2639 #ifdef CONFIG_IWLWIFI_DEBUGFS
2640         iwl_mvm_reset_frame_stats(mvm, &mvm->drv_rx_stats);
2641 #endif
2642         rs_initialize_lq(mvm, sta, lq_sta, band, init);
2643 }
2644
2645 static void rs_rate_update(void *mvm_r,
2646                            struct ieee80211_supported_band *sband,
2647                            struct cfg80211_chan_def *chandef,
2648                            struct ieee80211_sta *sta, void *priv_sta,
2649                            u32 changed)
2650 {
2651         u8 tid;
2652         struct iwl_op_mode *op_mode  =
2653                         (struct iwl_op_mode *)mvm_r;
2654         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2655
2656         /* Stop any ongoing aggregations as rs starts off assuming no agg */
2657         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2658                 ieee80211_stop_tx_ba_session(sta, tid);
2659
2660         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2661 }
2662
2663 #ifdef CONFIG_MAC80211_DEBUGFS
2664 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2665                                             struct iwl_lq_cmd *lq_cmd,
2666                                             enum ieee80211_band band,
2667                                             u32 ucode_rate)
2668 {
2669         struct rs_rate rate;
2670         int i;
2671         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2672         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2673         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2674
2675         for (i = 0; i < num_rates; i++)
2676                 lq_cmd->rs_table[i] = ucode_rate_le32;
2677
2678         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2679
2680         if (is_mimo(&rate))
2681                 lq_cmd->mimo_delim = num_rates - 1;
2682         else
2683                 lq_cmd->mimo_delim = 0;
2684
2685         lq_cmd->reduced_tpc = 0;
2686
2687         if (num_of_ant(ant) == 1)
2688                 lq_cmd->single_stream_ant_msk = ant;
2689
2690         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2691 }
2692 #endif /* CONFIG_MAC80211_DEBUGFS */
2693
2694 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2695                                      struct iwl_lq_sta *lq_sta,
2696                                      struct rs_rate *rate,
2697                                      __le32 *rs_table, int *rs_table_index,
2698                                      int num_rates, int num_retries,
2699                                      u8 valid_tx_ant, bool toggle_ant)
2700 {
2701         int i, j;
2702         __le32 ucode_rate;
2703         bool bottom_reached = false;
2704         int prev_rate_idx = rate->index;
2705         int end = LINK_QUAL_MAX_RETRY_NUM;
2706         int index = *rs_table_index;
2707
2708         for (i = 0; i < num_rates && index < end; i++) {
2709                 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, rate));
2710                 for (j = 0; j < num_retries && index < end; j++, index++)
2711                         rs_table[index] = ucode_rate;
2712
2713                 if (toggle_ant)
2714                         rs_toggle_antenna(valid_tx_ant, rate);
2715
2716                 prev_rate_idx = rate->index;
2717                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2718                 if (bottom_reached && !is_legacy(rate))
2719                         break;
2720         }
2721
2722         if (!bottom_reached)
2723                 rate->index = prev_rate_idx;
2724
2725         *rs_table_index = index;
2726 }
2727
2728 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2729  * column the rate table should look like this:
2730  *
2731  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2732  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2733  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2734  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2735  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2736  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2737  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2738  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2739  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2740  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2741  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2742  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2743  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2744  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2745  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2746  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2747  */
2748 static void rs_build_rates_table(struct iwl_mvm *mvm,
2749                                  struct iwl_lq_sta *lq_sta,
2750                                  const struct rs_rate *initial_rate)
2751 {
2752         struct rs_rate rate;
2753         int num_rates, num_retries, index = 0;
2754         u8 valid_tx_ant = 0;
2755         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2756         bool toggle_ant = false;
2757
2758         memcpy(&rate, initial_rate, sizeof(rate));
2759
2760         valid_tx_ant = mvm->fw->valid_tx_ant;
2761
2762         if (is_siso(&rate)) {
2763                 num_rates = RS_INITIAL_SISO_NUM_RATES;
2764                 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
2765         } else if (is_mimo(&rate)) {
2766                 num_rates = RS_INITIAL_MIMO_NUM_RATES;
2767                 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
2768         } else {
2769                 num_rates = RS_INITIAL_LEGACY_NUM_RATES;
2770                 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2771                 toggle_ant = true;
2772         }
2773
2774         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2775                                  num_rates, num_retries, valid_tx_ant,
2776                                  toggle_ant);
2777
2778         rs_get_lower_rate_down_column(lq_sta, &rate);
2779
2780         if (is_siso(&rate)) {
2781                 num_rates = RS_SECONDARY_SISO_NUM_RATES;
2782                 num_retries = RS_SECONDARY_SISO_RETRIES;
2783                 lq_cmd->mimo_delim = index;
2784         } else if (is_legacy(&rate)) {
2785                 num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2786                 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2787         } else {
2788                 WARN_ON_ONCE(1);
2789         }
2790
2791         toggle_ant = true;
2792
2793         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2794                                  num_rates, num_retries, valid_tx_ant,
2795                                  toggle_ant);
2796
2797         rs_get_lower_rate_down_column(lq_sta, &rate);
2798
2799         num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2800         num_retries = RS_LEGACY_RETRIES_PER_RATE;
2801
2802         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2803                                  num_rates, num_retries, valid_tx_ant,
2804                                  toggle_ant);
2805
2806 }
2807
2808 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
2809                            struct ieee80211_sta *sta,
2810                            struct iwl_lq_sta *lq_sta,
2811                            const struct rs_rate *initial_rate)
2812 {
2813         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2814         struct iwl_mvm_sta *mvmsta;
2815         struct iwl_mvm_vif *mvmvif;
2816
2817         lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2818         lq_cmd->agg_time_limit =
2819                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2820
2821 #ifdef CONFIG_MAC80211_DEBUGFS
2822         if (lq_sta->pers.dbg_fixed_rate) {
2823                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
2824                                                 lq_sta->band,
2825                                                 lq_sta->pers.dbg_fixed_rate);
2826                 return;
2827         }
2828 #endif
2829         if (WARN_ON_ONCE(!sta || !initial_rate))
2830                 return;
2831
2832         rs_build_rates_table(mvm, lq_sta, initial_rate);
2833
2834         if (num_of_ant(initial_rate->ant) == 1)
2835                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
2836
2837         mvmsta = iwl_mvm_sta_from_mac80211(sta);
2838         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
2839
2840         if (num_of_ant(initial_rate->ant) == 1)
2841                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
2842
2843         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
2844
2845         /*
2846          * In case of low latency, tell the firwmare to leave a frame in the
2847          * Tx Fifo so that it can start a transaction in the same TxOP. This
2848          * basically allows the firmware to send bursts.
2849          */
2850         if (iwl_mvm_vif_low_latency(mvmvif)) {
2851                 lq_cmd->agg_frame_cnt_limit--;
2852
2853                 if (mvm->low_latency_agg_frame_limit)
2854                         lq_cmd->agg_frame_cnt_limit =
2855                                 min(lq_cmd->agg_frame_cnt_limit,
2856                                     mvm->low_latency_agg_frame_limit);
2857         }
2858
2859         if (mvmsta->vif->p2p)
2860                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
2861
2862         lq_cmd->agg_time_limit =
2863                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
2864 }
2865
2866 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2867 {
2868         return hw->priv;
2869 }
2870 /* rate scale requires free function to be implemented */
2871 static void rs_free(void *mvm_rate)
2872 {
2873         return;
2874 }
2875
2876 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2877                         void *mvm_sta)
2878 {
2879         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2880         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2881
2882         IWL_DEBUG_RATE(mvm, "enter\n");
2883         IWL_DEBUG_RATE(mvm, "leave\n");
2884 }
2885
2886 #ifdef CONFIG_MAC80211_DEBUGFS
2887 int rs_pretty_print_rate(char *buf, const u32 rate)
2888 {
2889
2890         char *type, *bw;
2891         u8 mcs = 0, nss = 0;
2892         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2893
2894         if (!(rate & RATE_MCS_HT_MSK) &&
2895             !(rate & RATE_MCS_VHT_MSK)) {
2896                 int index = iwl_hwrate_to_plcp_idx(rate);
2897
2898                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
2899                                rs_pretty_ant(ant),
2900                                index == IWL_RATE_INVALID ? "BAD" :
2901                                iwl_rate_mcs[index].mbps);
2902         }
2903
2904         if (rate & RATE_MCS_VHT_MSK) {
2905                 type = "VHT";
2906                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2907                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
2908                        >> RATE_VHT_MCS_NSS_POS) + 1;
2909         } else if (rate & RATE_MCS_HT_MSK) {
2910                 type = "HT";
2911                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
2912         } else {
2913                 type = "Unknown"; /* shouldn't happen */
2914         }
2915
2916         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2917         case RATE_MCS_CHAN_WIDTH_20:
2918                 bw = "20Mhz";
2919                 break;
2920         case RATE_MCS_CHAN_WIDTH_40:
2921                 bw = "40Mhz";
2922                 break;
2923         case RATE_MCS_CHAN_WIDTH_80:
2924                 bw = "80Mhz";
2925                 break;
2926         case RATE_MCS_CHAN_WIDTH_160:
2927                 bw = "160Mhz";
2928                 break;
2929         default:
2930                 bw = "BAD BW";
2931         }
2932
2933         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
2934                        type, rs_pretty_ant(ant), bw, mcs, nss,
2935                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
2936                        (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
2937                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
2938                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
2939                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
2940 }
2941
2942 /**
2943  * Program the device to use fixed rate for frame transmit
2944  * This is for debugging/testing only
2945  * once the device start use fixed rate, we need to reload the module
2946  * to being back the normal operation.
2947  */
2948 static void rs_program_fix_rate(struct iwl_mvm *mvm,
2949                                 struct iwl_lq_sta *lq_sta)
2950 {
2951         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2952         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2953         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2954
2955         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
2956                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
2957
2958         if (lq_sta->pers.dbg_fixed_rate) {
2959                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
2960                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
2961         }
2962 }
2963
2964 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2965                         const char __user *user_buf, size_t count, loff_t *ppos)
2966 {
2967         struct iwl_lq_sta *lq_sta = file->private_data;
2968         struct iwl_mvm *mvm;
2969         char buf[64];
2970         size_t buf_size;
2971         u32 parsed_rate;
2972
2973         mvm = lq_sta->pers.drv;
2974         memset(buf, 0, sizeof(buf));
2975         buf_size = min(count, sizeof(buf) -  1);
2976         if (copy_from_user(buf, user_buf, buf_size))
2977                 return -EFAULT;
2978
2979         if (sscanf(buf, "%x", &parsed_rate) == 1)
2980                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
2981         else
2982                 lq_sta->pers.dbg_fixed_rate = 0;
2983
2984         rs_program_fix_rate(mvm, lq_sta);
2985
2986         return count;
2987 }
2988
2989 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2990                         char __user *user_buf, size_t count, loff_t *ppos)
2991 {
2992         char *buff;
2993         int desc = 0;
2994         int i = 0;
2995         ssize_t ret;
2996
2997         struct iwl_lq_sta *lq_sta = file->private_data;
2998         struct iwl_mvm *mvm;
2999         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3000         struct rs_rate *rate = &tbl->rate;
3001         mvm = lq_sta->pers.drv;
3002         buff = kmalloc(2048, GFP_KERNEL);
3003         if (!buff)
3004                 return -ENOMEM;
3005
3006         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3007         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3008                         lq_sta->total_failed, lq_sta->total_success,
3009                         lq_sta->active_legacy_rate);
3010         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3011                         lq_sta->pers.dbg_fixed_rate);
3012         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3013             (mvm->fw->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3014             (mvm->fw->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3015             (mvm->fw->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3016         desc += sprintf(buff+desc, "lq type %s\n",
3017                         (is_legacy(rate)) ? "legacy" :
3018                         is_vht(rate) ? "VHT" : "HT");
3019         if (!is_legacy(rate)) {
3020                 desc += sprintf(buff+desc, " %s",
3021                    (is_siso(rate)) ? "SISO" : "MIMO2");
3022                    desc += sprintf(buff+desc, " %s",
3023                                    (is_ht20(rate)) ? "20MHz" :
3024                                    (is_ht40(rate)) ? "40MHz" :
3025                                    (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3026                    desc += sprintf(buff+desc, " %s %s %s\n",
3027                                    (rate->sgi) ? "SGI" : "NGI",
3028                                    (rate->ldpc) ? "LDPC" : "BCC",
3029                                    (lq_sta->is_agg) ? "AGG on" : "");
3030         }
3031         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3032                         lq_sta->last_rate_n_flags);
3033         desc += sprintf(buff+desc,
3034                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3035                         lq_sta->lq.flags,
3036                         lq_sta->lq.mimo_delim,
3037                         lq_sta->lq.single_stream_ant_msk,
3038                         lq_sta->lq.dual_stream_ant_msk);
3039
3040         desc += sprintf(buff+desc,
3041                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3042                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3043                         lq_sta->lq.agg_disable_start_th,
3044                         lq_sta->lq.agg_frame_cnt_limit);
3045
3046         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3047         desc += sprintf(buff+desc,
3048                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3049                         lq_sta->lq.initial_rate_index[0],
3050                         lq_sta->lq.initial_rate_index[1],
3051                         lq_sta->lq.initial_rate_index[2],
3052                         lq_sta->lq.initial_rate_index[3]);
3053
3054         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3055                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3056
3057                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3058                 desc += rs_pretty_print_rate(buff+desc, r);
3059         }
3060
3061         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3062         kfree(buff);
3063         return ret;
3064 }
3065
3066 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3067         .write = rs_sta_dbgfs_scale_table_write,
3068         .read = rs_sta_dbgfs_scale_table_read,
3069         .open = simple_open,
3070         .llseek = default_llseek,
3071 };
3072 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3073                         char __user *user_buf, size_t count, loff_t *ppos)
3074 {
3075         char *buff;
3076         int desc = 0;
3077         int i, j;
3078         ssize_t ret;
3079         struct iwl_scale_tbl_info *tbl;
3080         struct rs_rate *rate;
3081         struct iwl_lq_sta *lq_sta = file->private_data;
3082
3083         buff = kmalloc(1024, GFP_KERNEL);
3084         if (!buff)
3085                 return -ENOMEM;
3086
3087         for (i = 0; i < LQ_SIZE; i++) {
3088                 tbl = &(lq_sta->lq_info[i]);
3089                 rate = &tbl->rate;
3090                 desc += sprintf(buff+desc,
3091                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3092                                 "index=%d\n",
3093                                 lq_sta->active_tbl == i ? "*" : "x",
3094                                 rate->type,
3095                                 rate->sgi,
3096                                 is_ht20(rate) ? "20Mhz" :
3097                                 is_ht40(rate) ? "40Mhz" :
3098                                 is_ht80(rate) ? "80Mhz" : "ERR",
3099                                 rate->index);
3100                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3101                         desc += sprintf(buff+desc,
3102                                 "counter=%d success=%d %%=%d\n",
3103                                 tbl->win[j].counter,
3104                                 tbl->win[j].success_counter,
3105                                 tbl->win[j].success_ratio);
3106                 }
3107         }
3108         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3109         kfree(buff);
3110         return ret;
3111 }
3112
3113 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3114         .read = rs_sta_dbgfs_stats_table_read,
3115         .open = simple_open,
3116         .llseek = default_llseek,
3117 };
3118
3119 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3120                                               char __user *user_buf,
3121                                               size_t count, loff_t *ppos)
3122 {
3123         static const char * const column_name[] = {
3124                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3125                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3126                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3127                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3128                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3129                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3130                 [RS_COLUMN_MIMO2] = "MIMO2",
3131                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3132         };
3133
3134         static const char * const rate_name[] = {
3135                 [IWL_RATE_1M_INDEX] = "1M",
3136                 [IWL_RATE_2M_INDEX] = "2M",
3137                 [IWL_RATE_5M_INDEX] = "5.5M",
3138                 [IWL_RATE_11M_INDEX] = "11M",
3139                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3140                 [IWL_RATE_9M_INDEX] = "9M",
3141                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3142                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3143                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3144                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3145                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3146                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3147                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3148                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3149                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3150         };
3151
3152         char *buff, *pos, *endpos;
3153         int col, rate;
3154         ssize_t ret;
3155         struct iwl_lq_sta *lq_sta = file->private_data;
3156         struct rs_rate_stats *stats;
3157         static const size_t bufsz = 1024;
3158
3159         buff = kmalloc(bufsz, GFP_KERNEL);
3160         if (!buff)
3161                 return -ENOMEM;
3162
3163         pos = buff;
3164         endpos = pos + bufsz;
3165
3166         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3167         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3168                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3169         pos += scnprintf(pos, endpos - pos, "\n");
3170
3171         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3172                 pos += scnprintf(pos, endpos - pos,
3173                                  "%s,", column_name[col]);
3174
3175                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3176                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3177                         pos += scnprintf(pos, endpos - pos,
3178                                          "%llu/%llu,",
3179                                          stats->success,
3180                                          stats->total);
3181                 }
3182                 pos += scnprintf(pos, endpos - pos, "\n");
3183         }
3184
3185         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3186         kfree(buff);
3187         return ret;
3188 }
3189
3190 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3191                                                const char __user *user_buf,
3192                                                size_t count, loff_t *ppos)
3193 {
3194         struct iwl_lq_sta *lq_sta = file->private_data;
3195         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3196
3197         return count;
3198 }
3199
3200 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3201         .read = rs_sta_dbgfs_drv_tx_stats_read,
3202         .write = rs_sta_dbgfs_drv_tx_stats_write,
3203         .open = simple_open,
3204         .llseek = default_llseek,
3205 };
3206
3207 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3208 {
3209         struct iwl_lq_sta *lq_sta = mvm_sta;
3210         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3211                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
3212         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3213                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
3214         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3215                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3216         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3217                           &lq_sta->tx_agg_tid_en);
3218         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3219                           &lq_sta->pers.dbg_fixed_txp_reduction);
3220 }
3221
3222 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3223 {
3224 }
3225 #endif
3226
3227 /*
3228  * Initialization of rate scaling information is done by driver after
3229  * the station is added. Since mac80211 calls this function before a
3230  * station is added we ignore it.
3231  */
3232 static void rs_rate_init_stub(void *mvm_r,
3233                               struct ieee80211_supported_band *sband,
3234                               struct cfg80211_chan_def *chandef,
3235                               struct ieee80211_sta *sta, void *mvm_sta)
3236 {
3237 }
3238
3239 static const struct rate_control_ops rs_mvm_ops = {
3240         .name = RS_NAME,
3241         .tx_status = rs_tx_status,
3242         .get_rate = rs_get_rate,
3243         .rate_init = rs_rate_init_stub,
3244         .alloc = rs_alloc,
3245         .free = rs_free,
3246         .alloc_sta = rs_alloc_sta,
3247         .free_sta = rs_free_sta,
3248         .rate_update = rs_rate_update,
3249 #ifdef CONFIG_MAC80211_DEBUGFS
3250         .add_sta_debugfs = rs_add_debugfs,
3251         .remove_sta_debugfs = rs_remove_debugfs,
3252 #endif
3253 };
3254
3255 int iwl_mvm_rate_control_register(void)
3256 {
3257         return ieee80211_rate_control_register(&rs_mvm_ops);
3258 }
3259
3260 void iwl_mvm_rate_control_unregister(void)
3261 {
3262         ieee80211_rate_control_unregister(&rs_mvm_ops);
3263 }
3264
3265 /**
3266  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3267  * Tx protection, according to this rquest and previous requests,
3268  * and send the LQ command.
3269  * @mvmsta: The station
3270  * @enable: Enable Tx protection?
3271  */
3272 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3273                           bool enable)
3274 {
3275         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3276
3277         lockdep_assert_held(&mvm->mutex);
3278
3279         if (enable) {
3280                 if (mvmsta->tx_protection == 0)
3281                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
3282                 mvmsta->tx_protection++;
3283         } else {
3284                 mvmsta->tx_protection--;
3285                 if (mvmsta->tx_protection == 0)
3286                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3287         }
3288
3289         return iwl_mvm_send_lq_cmd(mvm, lq, false);
3290 }