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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/slab.h>
  29 #include <net/mac80211.h>
  30
  31 #include <linux/netdevice.h>
  32 #include <linux/etherdevice.h>
  33 #include <linux/delay.h>
  34
  35 #include <linux/workqueue.h>
  36 #include "rs.h"
  37 #include "fw-api.h"
  38 #include "sta.h"
  39 #include "iwl-op-mode.h"
  40 #include "mvm.h"
  41
  42 #define RS_NAME "iwl-mvm-rs"
  43
  44 #define NUM_TRY_BEFORE_ANT_TOGGLE       1
  45 #define RS_LEGACY_RETRIES_PER_RATE      1
  46 #define RS_HT_VHT_RETRIES_PER_RATE      2
  47 #define RS_HT_VHT_RETRIES_PER_RATE_TW   1
  48 #define RS_INITIAL_MIMO_NUM_RATES       3
  49 #define RS_INITIAL_SISO_NUM_RATES       3
  50 #define RS_INITIAL_LEGACY_NUM_RATES     LINK_QUAL_MAX_RETRY_NUM
  51 #define RS_SECONDARY_LEGACY_NUM_RATES   LINK_QUAL_MAX_RETRY_NUM
  52 #define RS_SECONDARY_SISO_NUM_RATES     3
  53 #define RS_SECONDARY_SISO_RETRIES       1
  54
  55 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  56 #define IWL_RATE_MIN_FAILURE_TH         3       /* min failures to calc tpt */
  57 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  58
  59 /* max allowed rate miss before sync LQ cmd */
  60 #define IWL_MISSED_RATE_MAX             15
  61 #define RS_STAY_IN_COLUMN_TIMEOUT       (5*HZ)
  62 #define RS_IDLE_TIMEOUT                 (5*HZ)
  63
  64 static u8 rs_ht_to_legacy[] = {
  65         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  66         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  67         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  68         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  69         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  70         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  71         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  72         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  73         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  74         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  75 };
  76
  77 static const u8 ant_toggle_lookup[] = {
  78         [ANT_NONE] = ANT_NONE,
  79         [ANT_A] = ANT_B,
  80         [ANT_B] = ANT_C,
  81         [ANT_AB] = ANT_BC,
  82         [ANT_C] = ANT_A,
  83         [ANT_AC] = ANT_AB,
  84         [ANT_BC] = ANT_AC,
  85         [ANT_ABC] = ANT_ABC,
  86 };
  87
  88 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  89         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  90                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  91                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  92                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  93                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  94                                     IWL_RATE_##rp##M_INDEX,           \
  95                                     IWL_RATE_##rn##M_INDEX }
  96
  97 #define IWL_DECLARE_MCS_RATE(s)                                           \
  98         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
  99                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
 100                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
 101                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
 102                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
 103                                        IWL_RATE_INVM_INDEX,               \
 104                                        IWL_RATE_INVM_INDEX }
 105
 106 /*
 107  * Parameter order:
 108  *   rate, ht rate, prev rate, next rate
 109  *
 110  * If there isn't a valid next or previous rate then INV is used which
 111  * maps to IWL_RATE_INVALID
 112  *
 113  */
 114 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 115         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 116         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 117         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 118         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 119         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 120         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 121         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 122         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 123         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 124         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 125         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 126         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 127         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 128         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 129         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 130 };
 131
 132 enum rs_action {
 133         RS_ACTION_STAY = 0,
 134         RS_ACTION_DOWNSCALE = -1,
 135         RS_ACTION_UPSCALE = 1,
 136 };
 137
 138 enum rs_column_mode {
 139         RS_INVALID = 0,
 140         RS_LEGACY,
 141         RS_SISO,
 142         RS_MIMO2,
 143 };
 144
 145 #define MAX_NEXT_COLUMNS 7
 146 #define MAX_COLUMN_CHECKS 3
 147
 148 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 149                                      struct ieee80211_sta *sta,
 150                                      struct iwl_scale_tbl_info *tbl);
 151
 152 struct rs_tx_column {
 153         enum rs_column_mode mode;
 154         u8 ant;
 155         bool sgi;
 156         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 157         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 158 };
 159
 160 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 161                           struct iwl_scale_tbl_info *tbl)
 162 {
 163         if (!sta->ht_cap.ht_supported)
 164                 return false;
 165
 166         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 167                 return false;
 168
 169         if (num_of_ant(mvm->fw->valid_tx_ant) < 2)
 170                 return false;
 171
 172         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 173                 return false;
 174
 175         return true;
 176 }
 177
 178 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 179                           struct iwl_scale_tbl_info *tbl)
 180 {
 181         if (!sta->ht_cap.ht_supported)
 182                 return false;
 183
 184         return true;
 185 }
 186
 187 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 188                          struct iwl_scale_tbl_info *tbl)
 189 {
 190         struct rs_rate *rate = &tbl->rate;
 191         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 192         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 193
 194         if (is_ht20(rate) && (ht_cap->cap &
 195                              IEEE80211_HT_CAP_SGI_20))
 196                 return true;
 197         if (is_ht40(rate) && (ht_cap->cap &
 198                              IEEE80211_HT_CAP_SGI_40))
 199                 return true;
 200         if (is_ht80(rate) && (vht_cap->cap &
 201                              IEEE80211_VHT_CAP_SHORT_GI_80))
 202                 return true;
 203
 204         return false;
 205 }
 206
 207 static const struct rs_tx_column rs_tx_columns[] = {
 208         [RS_COLUMN_LEGACY_ANT_A] = {
 209                 .mode = RS_LEGACY,
 210                 .ant = ANT_A,
 211                 .next_columns = {
 212                         RS_COLUMN_LEGACY_ANT_B,
 213                         RS_COLUMN_SISO_ANT_A,
 214                         RS_COLUMN_SISO_ANT_B,
 215                         RS_COLUMN_INVALID,
 216                         RS_COLUMN_INVALID,
 217                         RS_COLUMN_INVALID,
 218                         RS_COLUMN_INVALID,
 219                 },
 220         },
 221         [RS_COLUMN_LEGACY_ANT_B] = {
 222                 .mode = RS_LEGACY,
 223                 .ant = ANT_B,
 224                 .next_columns = {
 225                         RS_COLUMN_LEGACY_ANT_A,
 226                         RS_COLUMN_SISO_ANT_A,
 227                         RS_COLUMN_SISO_ANT_B,
 228                         RS_COLUMN_INVALID,
 229                         RS_COLUMN_INVALID,
 230                         RS_COLUMN_INVALID,
 231                         RS_COLUMN_INVALID,
 232                 },
 233         },
 234         [RS_COLUMN_SISO_ANT_A] = {
 235                 .mode = RS_SISO,
 236                 .ant = ANT_A,
 237                 .next_columns = {
 238                         RS_COLUMN_SISO_ANT_B,
 239                         RS_COLUMN_MIMO2,
 240                         RS_COLUMN_SISO_ANT_A_SGI,
 241                         RS_COLUMN_SISO_ANT_B_SGI,
 242                         RS_COLUMN_LEGACY_ANT_A,
 243                         RS_COLUMN_LEGACY_ANT_B,
 244                         RS_COLUMN_INVALID,
 245                 },
 246                 .checks = {
 247                         rs_siso_allow,
 248                 },
 249         },
 250         [RS_COLUMN_SISO_ANT_B] = {
 251                 .mode = RS_SISO,
 252                 .ant = ANT_B,
 253                 .next_columns = {
 254                         RS_COLUMN_SISO_ANT_A,
 255                         RS_COLUMN_MIMO2,
 256                         RS_COLUMN_SISO_ANT_B_SGI,
 257                         RS_COLUMN_SISO_ANT_A_SGI,
 258                         RS_COLUMN_LEGACY_ANT_A,
 259                         RS_COLUMN_LEGACY_ANT_B,
 260                         RS_COLUMN_INVALID,
 261                 },
 262                 .checks = {
 263                         rs_siso_allow,
 264                 },
 265         },
 266         [RS_COLUMN_SISO_ANT_A_SGI] = {
 267                 .mode = RS_SISO,
 268                 .ant = ANT_A,
 269                 .sgi = true,
 270                 .next_columns = {
 271                         RS_COLUMN_SISO_ANT_B_SGI,
 272                         RS_COLUMN_MIMO2_SGI,
 273                         RS_COLUMN_SISO_ANT_A,
 274                         RS_COLUMN_SISO_ANT_B,
 275                         RS_COLUMN_MIMO2,
 276                         RS_COLUMN_LEGACY_ANT_A,
 277                         RS_COLUMN_LEGACY_ANT_B,
 278                 },
 279                 .checks = {
 280                         rs_siso_allow,
 281                         rs_sgi_allow,
 282                 },
 283         },
 284         [RS_COLUMN_SISO_ANT_B_SGI] = {
 285                 .mode = RS_SISO,
 286                 .ant = ANT_B,
 287                 .sgi = true,
 288                 .next_columns = {
 289                         RS_COLUMN_SISO_ANT_A_SGI,
 290                         RS_COLUMN_MIMO2_SGI,
 291                         RS_COLUMN_SISO_ANT_B,
 292                         RS_COLUMN_SISO_ANT_A,
 293                         RS_COLUMN_MIMO2,
 294                         RS_COLUMN_LEGACY_ANT_A,
 295                         RS_COLUMN_LEGACY_ANT_B,
 296                 },
 297                 .checks = {
 298                         rs_siso_allow,
 299                         rs_sgi_allow,
 300                 },
 301         },
 302         [RS_COLUMN_MIMO2] = {
 303                 .mode = RS_MIMO2,
 304                 .ant = ANT_AB,
 305                 .next_columns = {
 306                         RS_COLUMN_SISO_ANT_A,
 307                         RS_COLUMN_SISO_ANT_B,
 308                         RS_COLUMN_SISO_ANT_A_SGI,
 309                         RS_COLUMN_SISO_ANT_B_SGI,
 310                         RS_COLUMN_MIMO2_SGI,
 311                         RS_COLUMN_LEGACY_ANT_A,
 312                         RS_COLUMN_LEGACY_ANT_B,
 313                 },
 314                 .checks = {
 315                         rs_mimo_allow,
 316                 },
 317         },
 318         [RS_COLUMN_MIMO2_SGI] = {
 319                 .mode = RS_MIMO2,
 320                 .ant = ANT_AB,
 321                 .sgi = true,
 322                 .next_columns = {
 323                         RS_COLUMN_SISO_ANT_A_SGI,
 324                         RS_COLUMN_SISO_ANT_B_SGI,
 325                         RS_COLUMN_SISO_ANT_A,
 326                         RS_COLUMN_SISO_ANT_B,
 327                         RS_COLUMN_MIMO2,
 328                         RS_COLUMN_LEGACY_ANT_A,
 329                         RS_COLUMN_LEGACY_ANT_B,
 330                 },
 331                 .checks = {
 332                         rs_mimo_allow,
 333                         rs_sgi_allow,
 334                 },
 335         },
 336 };
 337
 338 static inline u8 rs_extract_rate(u32 rate_n_flags)
 339 {
 340         /* also works for HT because bits 7:6 are zero there */
 341         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 342 }
 343
 344 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 345 {
 346         int idx = 0;
 347
 348         if (rate_n_flags & RATE_MCS_HT_MSK) {
 349                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 350                 idx += IWL_RATE_MCS_0_INDEX;
 351
 352                 /* skip 9M not supported in HT*/
 353                 if (idx >= IWL_RATE_9M_INDEX)
 354                         idx += 1;
 355                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 356                         return idx;
 357         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 358                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 359                 idx += IWL_RATE_MCS_0_INDEX;
 360
 361                 /* skip 9M not supported in VHT*/
 362                 if (idx >= IWL_RATE_9M_INDEX)
 363                         idx++;
 364                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 365                         return idx;
 366         } else {
 367                 /* legacy rate format, search for match in table */
 368
 369                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 370                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 371                         if (iwl_rates[idx].plcp == legacy_rate)
 372                                 return idx;
 373         }
 374
 375         return IWL_RATE_INVALID;
 376 }
 377
 378 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 379                                    struct sk_buff *skb,
 380                                    struct ieee80211_sta *sta,
 381                                    struct iwl_lq_sta *lq_sta);
 382 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 383                            struct ieee80211_sta *sta,
 384                            struct iwl_lq_sta *lq_sta,
 385                            const struct rs_rate *initial_rate);
 386 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 387
 388 /**
 389  * The following tables contain the expected throughput metrics for all rates
 390  *
 391  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 392  *
 393  * where invalid entries are zeros.
 394  *
 395  * CCK rates are only valid in legacy table and will only be used in G
 396  * (2.4 GHz) band.
 397  */
 398
 399 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 400         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 401 };
 402
 403 /* Expected TpT tables. 4 indexes:
 404  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 405  */
 406 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 407         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 408         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 409         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 410         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 411 };
 412
 413 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 414         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 415         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 416         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 417         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 418 };
 419
 420 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 421         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 422         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 423         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 424         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 425 };
 426
 427 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 428         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 429         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 430         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 431         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 432 };
 433
 434 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 435         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 436         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 437         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 438         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 439 };
 440
 441 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 442         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 443         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 444         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 445         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 446 };
 447
 448 /* mbps, mcs */
 449 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 450         {  "1", "BPSK DSSS"},
 451         {  "2", "QPSK DSSS"},
 452         {"5.5", "BPSK CCK"},
 453         { "11", "QPSK CCK"},
 454         {  "6", "BPSK 1/2"},
 455         {  "9", "BPSK 1/2"},
 456         { "12", "QPSK 1/2"},
 457         { "18", "QPSK 3/4"},
 458         { "24", "16QAM 1/2"},
 459         { "36", "16QAM 3/4"},
 460         { "48", "64QAM 2/3"},
 461         { "54", "64QAM 3/4"},
 462         { "60", "64QAM 5/6"},
 463 };
 464
 465 #define MCS_INDEX_PER_STREAM    (8)
 466
 467 static const char *rs_pretty_ant(u8 ant)
 468 {
 469         static const char * const ant_name[] = {
 470                 [ANT_NONE] = "None",
 471                 [ANT_A]    = "A",
 472                 [ANT_B]    = "B",
 473                 [ANT_AB]   = "AB",
 474                 [ANT_C]    = "C",
 475                 [ANT_AC]   = "AC",
 476                 [ANT_BC]   = "BC",
 477                 [ANT_ABC]  = "ABC",
 478         };
 479
 480         if (ant > ANT_ABC)
 481                 return "UNKNOWN";
 482
 483         return ant_name[ant];
 484 }
 485
 486 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 487 {
 488         static const char * const lq_types[] = {
 489                 [LQ_NONE] = "NONE",
 490                 [LQ_LEGACY_A] = "LEGACY_A",
 491                 [LQ_LEGACY_G] = "LEGACY_G",
 492                 [LQ_HT_SISO] = "HT SISO",
 493                 [LQ_HT_MIMO2] = "HT MIMO",
 494                 [LQ_VHT_SISO] = "VHT SISO",
 495                 [LQ_VHT_MIMO2] = "VHT MIMO",
 496         };
 497
 498         if (type < LQ_NONE || type >= LQ_MAX)
 499                 return "UNKNOWN";
 500
 501         return lq_types[type];
 502 }
 503
 504 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 505                                 const char *prefix)
 506 {
 507         IWL_DEBUG_RATE(mvm, "%s: (%s: %d) ANT: %s BW: %d SGI: %d\n",
 508                        prefix, rs_pretty_lq_type(rate->type),
 509                        rate->index, rs_pretty_ant(rate->ant),
 510                        rate->bw, rate->sgi);
 511 }
 512
 513 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 514 {
 515         window->data = 0;
 516         window->success_counter = 0;
 517         window->success_ratio = IWL_INVALID_VALUE;
 518         window->counter = 0;
 519         window->average_tpt = IWL_INVALID_VALUE;
 520 }
 521
 522 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 523                                             struct iwl_scale_tbl_info *tbl)
 524 {
 525         int i;
 526
 527         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 528         for (i = 0; i < IWL_RATE_COUNT; i++)
 529                 rs_rate_scale_clear_window(&tbl->win[i]);
 530 }
 531
 532 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 533 {
 534         return (ant_type & valid_antenna) == ant_type;
 535 }
 536
 537 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 538                                       struct iwl_lq_sta *lq_data, u8 tid,
 539                                       struct ieee80211_sta *sta)
 540 {
 541         int ret = -EAGAIN;
 542
 543         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 544                      sta->addr, tid);
 545         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 546         if (ret == -EAGAIN) {
 547                 /*
 548                  * driver and mac80211 is out of sync
 549                  * this might be cause by reloading firmware
 550                  * stop the tx ba session here
 551                  */
 552                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 553                         tid);
 554                 ieee80211_stop_tx_ba_session(sta, tid);
 555         }
 556         return ret;
 557 }
 558
 559 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 560                               struct iwl_lq_sta *lq_data,
 561                               struct ieee80211_sta *sta)
 562 {
 563         if (tid < IWL_MAX_TID_COUNT)
 564                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 565         else
 566                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 567                         tid, IWL_MAX_TID_COUNT);
 568 }
 569
 570 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 571 {
 572         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 573                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 574                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 575 }
 576
 577 /*
 578  * Static function to get the expected throughput from an iwl_scale_tbl_info
 579  * that wraps a NULL pointer check
 580  */
 581 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 582 {
 583         if (tbl->expected_tpt)
 584                 return tbl->expected_tpt[rs_index];
 585         return 0;
 586 }
 587
 588 /**
 589  * rs_collect_tx_data - Update the success/failure sliding window
 590  *
 591  * We keep a sliding window of the last 62 packets transmitted
 592  * at this rate.  window->data contains the bitmask of successful
 593  * packets.
 594  */
 595 static int _rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 596                                int scale_index, int attempts, int successes,
 597                                struct iwl_rate_scale_data *window)
 598 {
 599         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 600         s32 fail_count, tpt;
 601
 602         /* Get expected throughput */
 603         tpt = get_expected_tpt(tbl, scale_index);
 604
 605         /*
 606          * Keep track of only the latest 62 tx frame attempts in this rate's
 607          * history window; anything older isn't really relevant any more.
 608          * If we have filled up the sliding window, drop the oldest attempt;
 609          * if the oldest attempt (highest bit in bitmap) shows "success",
 610          * subtract "1" from the success counter (this is the main reason
 611          * we keep these bitmaps!).
 612          */
 613         while (attempts > 0) {
 614                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 615                         /* remove earliest */
 616                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 617
 618                         if (window->data & mask) {
 619                                 window->data &= ~mask;
 620                                 window->success_counter--;
 621                         }
 622                 }
 623
 624                 /* Increment frames-attempted counter */
 625                 window->counter++;
 626
 627                 /* Shift bitmap by one frame to throw away oldest history */
 628                 window->data <<= 1;
 629
 630                 /* Mark the most recent #successes attempts as successful */
 631                 if (successes > 0) {
 632                         window->success_counter++;
 633                         window->data |= 0x1;
 634                         successes--;
 635                 }
 636
 637                 attempts--;
 638         }
 639
 640         /* Calculate current success ratio, avoid divide-by-0! */
 641         if (window->counter > 0)
 642                 window->success_ratio = 128 * (100 * window->success_counter)
 643                                         / window->counter;
 644         else
 645                 window->success_ratio = IWL_INVALID_VALUE;
 646
 647         fail_count = window->counter - window->success_counter;
 648
 649         /* Calculate average throughput, if we have enough history. */
 650         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 651             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 652                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 653         else
 654                 window->average_tpt = IWL_INVALID_VALUE;
 655
 656         return 0;
 657 }
 658
 659 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 660                               int scale_index, int attempts, int successes)
 661 {
 662         struct iwl_rate_scale_data *window = NULL;
 663
 664         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 665                 return -EINVAL;
 666
 667         /* Select window for current tx bit rate */
 668         window = &(tbl->win[scale_index]);
 669
 670         return _rs_collect_tx_data(tbl, scale_index, attempts, successes,
 671                                    window);
 672 }
 673
 674 /* Convert rs_rate object into ucode rate bitmask */
 675 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 676                                   struct rs_rate *rate)
 677 {
 678         u32 ucode_rate = 0;
 679         int index = rate->index;
 680
 681         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 682                          RATE_MCS_ANT_ABC_MSK);
 683
 684         if (is_legacy(rate)) {
 685                 ucode_rate |= iwl_rates[index].plcp;
 686                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 687                         ucode_rate |= RATE_MCS_CCK_MSK;
 688                 return ucode_rate;
 689         }
 690
 691         if (is_ht(rate)) {
 692                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 693                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 694                         index = IWL_LAST_HT_RATE;
 695                 }
 696                 ucode_rate |= RATE_MCS_HT_MSK;
 697
 698                 if (is_ht_siso(rate))
 699                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 700                 else if (is_ht_mimo2(rate))
 701                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 702                 else
 703                         WARN_ON_ONCE(1);
 704         } else if (is_vht(rate)) {
 705                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 706                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 707                         index = IWL_LAST_VHT_RATE;
 708                 }
 709                 ucode_rate |= RATE_MCS_VHT_MSK;
 710                 if (is_vht_siso(rate))
 711                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 712                 else if (is_vht_mimo2(rate))
 713                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 714                 else
 715                         WARN_ON_ONCE(1);
 716
 717         } else {
 718                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 719         }
 720
 721         ucode_rate |= rate->bw;
 722         if (rate->sgi)
 723                 ucode_rate |= RATE_MCS_SGI_MSK;
 724
 725         return ucode_rate;
 726 }
 727
 728 /* Convert a ucode rate into an rs_rate object */
 729 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 730                                    enum ieee80211_band band,
 731                                    struct rs_rate *rate)
 732 {
 733         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 734         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 735         u8 nss;
 736
 737         memset(rate, 0, sizeof(*rate));
 738         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 739
 740         if (rate->index == IWL_RATE_INVALID)
 741                 return -EINVAL;
 742
 743         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 744
 745         /* Legacy */
 746         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 747             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 748                 if (num_of_ant == 1) {
 749                         if (band == IEEE80211_BAND_5GHZ)
 750                                 rate->type = LQ_LEGACY_A;
 751                         else
 752                                 rate->type = LQ_LEGACY_G;
 753                 }
 754
 755                 return 0;
 756         }
 757
 758         /* HT or VHT */
 759         if (ucode_rate & RATE_MCS_SGI_MSK)
 760                 rate->sgi = true;
 761
 762         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 763
 764         if (ucode_rate & RATE_MCS_HT_MSK) {
 765                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 766                        RATE_HT_MCS_NSS_POS) + 1;
 767
 768                 if (nss == 1) {
 769                         rate->type = LQ_HT_SISO;
 770                         WARN_ON_ONCE(num_of_ant != 1);
 771                 } else if (nss == 2) {
 772                         rate->type = LQ_HT_MIMO2;
 773                         WARN_ON_ONCE(num_of_ant != 2);
 774                 } else {
 775                         WARN_ON_ONCE(1);
 776                 }
 777         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 778                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 779                        RATE_VHT_MCS_NSS_POS) + 1;
 780
 781                 if (nss == 1) {
 782                         rate->type = LQ_VHT_SISO;
 783                         WARN_ON_ONCE(num_of_ant != 1);
 784                 } else if (nss == 2) {
 785                         rate->type = LQ_VHT_MIMO2;
 786                         WARN_ON_ONCE(num_of_ant != 2);
 787                 } else {
 788                         WARN_ON_ONCE(1);
 789                 }
 790         }
 791
 792         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
 793         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 794                      !is_vht(rate));
 795
 796         return 0;
 797 }
 798
 799 /* switch to another antenna/antennas and return 1 */
 800 /* if no other valid antenna found, return 0 */
 801 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 802 {
 803         u8 new_ant_type;
 804
 805         if (!rate->ant || rate->ant > ANT_ABC)
 806                 return 0;
 807
 808         if (!rs_is_valid_ant(valid_ant, rate->ant))
 809                 return 0;
 810
 811         new_ant_type = ant_toggle_lookup[rate->ant];
 812
 813         while ((new_ant_type != rate->ant) &&
 814                !rs_is_valid_ant(valid_ant, new_ant_type))
 815                 new_ant_type = ant_toggle_lookup[new_ant_type];
 816
 817         if (new_ant_type == rate->ant)
 818                 return 0;
 819
 820         rate->ant = new_ant_type;
 821
 822         return 1;
 823 }
 824
 825 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 826                                   struct rs_rate *rate)
 827 {
 828         if (is_legacy(rate))
 829                 return lq_sta->active_legacy_rate;
 830         else if (is_siso(rate))
 831                 return lq_sta->active_siso_rate;
 832         else if (is_mimo2(rate))
 833                 return lq_sta->active_mimo2_rate;
 834
 835         WARN_ON_ONCE(1);
 836         return 0;
 837 }
 838
 839 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 840                                 int rate_type)
 841 {
 842         u8 high = IWL_RATE_INVALID;
 843         u8 low = IWL_RATE_INVALID;
 844
 845         /* 802.11A or ht walks to the next literal adjacent rate in
 846          * the rate table */
 847         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 848                 int i;
 849                 u32 mask;
 850
 851                 /* Find the previous rate that is in the rate mask */
 852                 i = index - 1;
 853                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 854                         if (rate_mask & mask) {
 855                                 low = i;
 856                                 break;
 857                         }
 858                 }
 859
 860                 /* Find the next rate that is in the rate mask */
 861                 i = index + 1;
 862                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 863                         if (rate_mask & mask) {
 864                                 high = i;
 865                                 break;
 866                         }
 867                 }
 868
 869                 return (high << 8) | low;
 870         }
 871
 872         low = index;
 873         while (low != IWL_RATE_INVALID) {
 874                 low = iwl_rates[low].prev_rs;
 875                 if (low == IWL_RATE_INVALID)
 876                         break;
 877                 if (rate_mask & (1 << low))
 878                         break;
 879                 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
 880         }
 881
 882         high = index;
 883         while (high != IWL_RATE_INVALID) {
 884                 high = iwl_rates[high].next_rs;
 885                 if (high == IWL_RATE_INVALID)
 886                         break;
 887                 if (rate_mask & (1 << high))
 888                         break;
 889                 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
 890         }
 891
 892         return (high << 8) | low;
 893 }
 894
 895 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
 896                                      struct rs_rate *rate)
 897 {
 898         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
 899 }
 900
 901 /* Get the next supported lower rate in the current column.
 902  * Return true if bottom rate in the current column was reached
 903  */
 904 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
 905                                         struct rs_rate *rate)
 906 {
 907         u8 low;
 908         u16 high_low;
 909         u16 rate_mask;
 910         struct iwl_mvm *mvm = lq_sta->drv;
 911
 912         rate_mask = rs_get_supported_rates(lq_sta, rate);
 913         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
 914                                         rate->type);
 915         low = high_low & 0xff;
 916
 917         /* Bottom rate of column reached */
 918         if (low == IWL_RATE_INVALID)
 919                 return true;
 920
 921         rate->index = low;
 922         return false;
 923 }
 924
 925 /* Get the next rate to use following a column downgrade */
 926 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
 927                                           struct rs_rate *rate)
 928 {
 929         struct iwl_mvm *mvm = lq_sta->drv;
 930
 931         if (is_legacy(rate)) {
 932                 /* No column to downgrade from Legacy */
 933                 return;
 934         } else if (is_siso(rate)) {
 935                 /* Downgrade to Legacy if we were in SISO */
 936                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 937                         rate->type = LQ_LEGACY_A;
 938                 else
 939                         rate->type = LQ_LEGACY_G;
 940
 941                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
 942
 943                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
 944                              rate->index > IWL_RATE_MCS_9_INDEX);
 945
 946                 rate->index = rs_ht_to_legacy[rate->index];
 947         } else {
 948                 /* Downgrade to SISO with same MCS if in MIMO  */
 949                 rate->type = is_vht_mimo2(rate) ?
 950                         LQ_VHT_SISO : LQ_HT_SISO;
 951         }
 952
 953
 954         if (num_of_ant(rate->ant) > 1)
 955                 rate->ant = first_antenna(mvm->fw->valid_tx_ant);
 956
 957         /* Relevant in both switching to SISO or Legacy */
 958         rate->sgi = false;
 959
 960         if (!rs_rate_supported(lq_sta, rate))
 961                 rs_get_lower_rate_in_column(lq_sta, rate);
 962 }
 963
 964 /* Simple function to compare two rate scale table types */
 965 static inline bool rs_rate_match(struct rs_rate *a,
 966                                  struct rs_rate *b)
 967 {
 968         return (a->type == b->type) && (a->ant == b->ant) && (a->sgi == b->sgi);
 969 }
 970
 971 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
 972 {
 973         if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 974                 return RATE_MCS_CHAN_WIDTH_40;
 975         else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 976                 return RATE_MCS_CHAN_WIDTH_80;
 977         else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
 978                 return RATE_MCS_CHAN_WIDTH_160;
 979
 980         return RATE_MCS_CHAN_WIDTH_20;
 981 }
 982
 983 /*
 984  * mac80211 sends us Tx status
 985  */
 986 static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
 987                          struct ieee80211_sta *sta, void *priv_sta,
 988                          struct sk_buff *skb)
 989 {
 990         int legacy_success;
 991         int retries;
 992         int mac_index, i;
 993         struct iwl_lq_sta *lq_sta = priv_sta;
 994         struct iwl_lq_cmd *table;
 995         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 996         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
 997         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 998         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 999         enum mac80211_rate_control_flags mac_flags;
1000         u32 ucode_rate;
1001         struct rs_rate rate;
1002         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1003
1004         /* Treat uninitialized rate scaling data same as non-existing. */
1005         if (!lq_sta) {
1006                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1007                 return;
1008         } else if (!lq_sta->drv) {
1009                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1010                 return;
1011         }
1012
1013 #ifdef CPTCFG_MAC80211_DEBUGFS
1014         /* Disable last tx check if we are debugging with fixed rate */
1015         if (lq_sta->dbg_fixed_rate) {
1016                 IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n");
1017                 return;
1018         }
1019 #endif
1020         if (!ieee80211_is_data(hdr->frame_control) ||
1021             info->flags & IEEE80211_TX_CTL_NO_ACK)
1022                 return;
1023
1024         /* This packet was aggregated but doesn't carry status info */
1025         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1026             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1027                 return;
1028
1029         /*
1030          * Ignore this Tx frame response if its initial rate doesn't match
1031          * that of latest Link Quality command.  There may be stragglers
1032          * from a previous Link Quality command, but we're no longer interested
1033          * in those; they're either from the "active" mode while we're trying
1034          * to check "search" mode, or a prior "search" mode after we've moved
1035          * to a new "search" mode (which might become the new "active" mode).
1036          */
1037         table = &lq_sta->lq;
1038         ucode_rate = le32_to_cpu(table->rs_table[0]);
1039         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1040         if (info->band == IEEE80211_BAND_5GHZ)
1041                 rate.index -= IWL_FIRST_OFDM_RATE;
1042         mac_flags = info->status.rates[0].flags;
1043         mac_index = info->status.rates[0].idx;
1044         /* For HT packets, map MCS to PLCP */
1045         if (mac_flags & IEEE80211_TX_RC_MCS) {
1046                 /* Remove # of streams */
1047                 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1048                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1049                         mac_index++;
1050                 /*
1051                  * mac80211 HT index is always zero-indexed; we need to move
1052                  * HT OFDM rates after CCK rates in 2.4 GHz band
1053                  */
1054                 if (info->band == IEEE80211_BAND_2GHZ)
1055                         mac_index += IWL_FIRST_OFDM_RATE;
1056         } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1057                 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1058                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1059                         mac_index++;
1060         }
1061
1062         if (time_after(jiffies,
1063                        (unsigned long)(lq_sta->last_tx + RS_IDLE_TIMEOUT))) {
1064                 int tid;
1065                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1066                 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
1067                         ieee80211_stop_tx_ba_session(sta, tid);
1068
1069                 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
1070                 return;
1071         }
1072         lq_sta->last_tx = jiffies;
1073
1074         /* Here we actually compare this rate to the latest LQ command */
1075         if ((mac_index < 0) ||
1076             (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1077             (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1078             (rate.ant != info->status.antenna) ||
1079             (!!(ucode_rate & RATE_MCS_HT_MSK) !=
1080              !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
1081             (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
1082              !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
1083             (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
1084              !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
1085             (rate.index != mac_index)) {
1086                 IWL_DEBUG_RATE(mvm,
1087                                "initial rate %d does not match %d (0x%x)\n",
1088                                mac_index, rate.index, ucode_rate);
1089                 /*
1090                  * Since rates mis-match, the last LQ command may have failed.
1091                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1092                  * ... driver.
1093                  */
1094                 lq_sta->missed_rate_counter++;
1095                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
1096                         lq_sta->missed_rate_counter = 0;
1097                         IWL_DEBUG_RATE(mvm,
1098                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1099                                        lq_sta->rs_state);
1100                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1101                 }
1102                 /* Regardless, ignore this status info for outdated rate */
1103                 return;
1104         } else
1105                 /* Rate did match, so reset the missed_rate_counter */
1106                 lq_sta->missed_rate_counter = 0;
1107
1108         /* Figure out if rate scale algorithm is in active or search table */
1109         if (rs_rate_match(&rate,
1110                           &(lq_sta->lq_info[lq_sta->active_tbl].rate))) {
1111                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1112                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1113         } else if (rs_rate_match(&rate,
1114                          &lq_sta->lq_info[1 - lq_sta->active_tbl].rate)) {
1115                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1116                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1117         } else {
1118                 IWL_DEBUG_RATE(mvm,
1119                                "Neither active nor search matches tx rate\n");
1120                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1121                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1122                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1123                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1124                 rs_dump_rate(mvm, &rate, "ACTUAL");
1125
1126                 /*
1127                  * no matching table found, let's by-pass the data collection
1128                  * and continue to perform rate scale to find the rate table
1129                  */
1130                 rs_stay_in_table(lq_sta, true);
1131                 goto done;
1132         }
1133
1134         /*
1135          * Updating the frame history depends on whether packets were
1136          * aggregated.
1137          *
1138          * For aggregation, all packets were transmitted at the same rate, the
1139          * first index into rate scale table.
1140          */
1141         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1142                 ucode_rate = le32_to_cpu(table->rs_table[0]);
1143                 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1144                 rs_collect_tx_data(curr_tbl, rate.index,
1145                                    info->status.ampdu_len,
1146                                    info->status.ampdu_ack_len);
1147
1148                 /* Update success/fail counts if not searching for new mode */
1149                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1150                         lq_sta->total_success += info->status.ampdu_ack_len;
1151                         lq_sta->total_failed += (info->status.ampdu_len -
1152                                         info->status.ampdu_ack_len);
1153                 }
1154         } else {
1155         /*
1156          * For legacy, update frame history with for each Tx retry.
1157          */
1158                 retries = info->status.rates[0].count - 1;
1159                 /* HW doesn't send more than 15 retries */
1160                 retries = min(retries, 15);
1161
1162                 /* The last transmission may have been successful */
1163                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1164                 /* Collect data for each rate used during failed TX attempts */
1165                 for (i = 0; i <= retries; ++i) {
1166                         ucode_rate = le32_to_cpu(table->rs_table[i]);
1167                         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1168                         /*
1169                          * Only collect stats if retried rate is in the same RS
1170                          * table as active/search.
1171                          */
1172                         if (rs_rate_match(&rate, &curr_tbl->rate))
1173                                 tmp_tbl = curr_tbl;
1174                         else if (rs_rate_match(&rate, &other_tbl->rate))
1175                                 tmp_tbl = other_tbl;
1176                         else
1177                                 continue;
1178
1179                         rs_collect_tx_data(tmp_tbl, rate.index, 1,
1180                                            i < retries ? 0 : legacy_success);
1181                 }
1182
1183                 /* Update success/fail counts if not searching for new mode */
1184                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1185                         lq_sta->total_success += legacy_success;
1186                         lq_sta->total_failed += retries + (1 - legacy_success);
1187                 }
1188         }
1189         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1190         lq_sta->last_rate_n_flags = ucode_rate;
1191 done:
1192         /* See if there's a better rate or modulation mode to try. */
1193         if (sta && sta->supp_rates[sband->band])
1194                 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
1195 }
1196
1197 /*
1198  * Begin a period of staying with a selected modulation mode.
1199  * Set "stay_in_tbl" flag to prevent any mode switches.
1200  * Set frame tx success limits according to legacy vs. high-throughput,
1201  * and reset overall (spanning all rates) tx success history statistics.
1202  * These control how long we stay using same modulation mode before
1203  * searching for a new mode.
1204  */
1205 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1206                                  struct iwl_lq_sta *lq_sta)
1207 {
1208         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1209         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1210         if (is_legacy) {
1211                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1212                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1213                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1214         } else {
1215                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1216                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1217                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1218         }
1219         lq_sta->table_count = 0;
1220         lq_sta->total_failed = 0;
1221         lq_sta->total_success = 0;
1222         lq_sta->flush_timer = jiffies;
1223         lq_sta->visited_columns = 0;
1224 }
1225
1226 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1227                                    const struct rs_tx_column *column)
1228 {
1229         switch (column->mode) {
1230         case RS_LEGACY:
1231                 return lq_sta->max_legacy_rate_idx;
1232         case RS_SISO:
1233                 return lq_sta->max_siso_rate_idx;
1234         case RS_MIMO2:
1235                 return lq_sta->max_mimo2_rate_idx;
1236         default:
1237                 WARN_ON_ONCE(1);
1238         }
1239
1240         return lq_sta->max_legacy_rate_idx;
1241 }
1242
1243 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1244                                             const struct rs_tx_column *column,
1245                                             u32 bw)
1246 {
1247         /* Used to choose among HT tables */
1248         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1249
1250         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1251                          column->mode != RS_SISO &&
1252                          column->mode != RS_MIMO2))
1253                 return expected_tpt_legacy;
1254
1255         /* Legacy rates have only one table */
1256         if (column->mode == RS_LEGACY)
1257                 return expected_tpt_legacy;
1258
1259         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1260         /* Choose among many HT tables depending on number of streams
1261          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1262          * status */
1263         if (column->mode == RS_SISO) {
1264                 switch (bw) {
1265                 case RATE_MCS_CHAN_WIDTH_20:
1266                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1267                         break;
1268                 case RATE_MCS_CHAN_WIDTH_40:
1269                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1270                         break;
1271                 case RATE_MCS_CHAN_WIDTH_80:
1272                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1273                         break;
1274                 default:
1275                         WARN_ON_ONCE(1);
1276                 }
1277         } else if (column->mode == RS_MIMO2) {
1278                 switch (bw) {
1279                 case RATE_MCS_CHAN_WIDTH_20:
1280                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1281                         break;
1282                 case RATE_MCS_CHAN_WIDTH_40:
1283                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1284                         break;
1285                 case RATE_MCS_CHAN_WIDTH_80:
1286                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1287                         break;
1288                 default:
1289                         WARN_ON_ONCE(1);
1290                 }
1291         } else {
1292                 WARN_ON_ONCE(1);
1293         }
1294
1295         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1296                 return ht_tbl_pointer[0];
1297         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1298                 return ht_tbl_pointer[1];
1299         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1300                 return ht_tbl_pointer[2];
1301         else                                            /* AGG+SGI */
1302                 return ht_tbl_pointer[3];
1303 }
1304
1305 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1306                                       struct iwl_scale_tbl_info *tbl)
1307 {
1308         struct rs_rate *rate = &tbl->rate;
1309         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1310
1311         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1312 }
1313
1314 /*
1315  * Find starting rate for new "search" high-throughput mode of modulation.
1316  * Goal is to find lowest expected rate (under perfect conditions) that is
1317  * above the current measured throughput of "active" mode, to give new mode
1318  * a fair chance to prove itself without too many challenges.
1319  *
1320  * This gets called when transitioning to more aggressive modulation
1321  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1322  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1323  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1324  * bit rate will typically need to increase, but not if performance was bad.
1325  */
1326 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1327                             struct iwl_lq_sta *lq_sta,
1328                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1329                             u16 rate_mask, s8 index)
1330 {
1331         /* "active" values */
1332         struct iwl_scale_tbl_info *active_tbl =
1333             &(lq_sta->lq_info[lq_sta->active_tbl]);
1334         s32 active_sr = active_tbl->win[index].success_ratio;
1335         s32 active_tpt = active_tbl->expected_tpt[index];
1336         /* expected "search" throughput */
1337         const u16 *tpt_tbl = tbl->expected_tpt;
1338
1339         s32 new_rate, high, low, start_hi;
1340         u16 high_low;
1341         s8 rate = index;
1342
1343         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1344
1345         while (1) {
1346                 high_low = rs_get_adjacent_rate(mvm, rate, rate_mask,
1347                                                 tbl->rate.type);
1348
1349                 low = high_low & 0xff;
1350                 high = (high_low >> 8) & 0xff;
1351
1352                 /*
1353                  * Lower the "search" bit rate, to give new "search" mode
1354                  * approximately the same throughput as "active" if:
1355                  *
1356                  * 1) "Active" mode has been working modestly well (but not
1357                  *    great), and expected "search" throughput (under perfect
1358                  *    conditions) at candidate rate is above the actual
1359                  *    measured "active" throughput (but less than expected
1360                  *    "active" throughput under perfect conditions).
1361                  * OR
1362                  * 2) "Active" mode has been working perfectly or very well
1363                  *    and expected "search" throughput (under perfect
1364                  *    conditions) at candidate rate is above expected
1365                  *    "active" throughput (under perfect conditions).
1366                  */
1367                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1368                      ((active_sr > RS_SR_FORCE_DECREASE) &&
1369                       (active_sr <= IWL_RATE_HIGH_TH) &&
1370                       (tpt_tbl[rate] <= active_tpt))) ||
1371                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1372                      (tpt_tbl[rate] > active_tpt))) {
1373                         /* (2nd or later pass)
1374                          * If we've already tried to raise the rate, and are
1375                          * now trying to lower it, use the higher rate. */
1376                         if (start_hi != IWL_RATE_INVALID) {
1377                                 new_rate = start_hi;
1378                                 break;
1379                         }
1380
1381                         new_rate = rate;
1382
1383                         /* Loop again with lower rate */
1384                         if (low != IWL_RATE_INVALID)
1385                                 rate = low;
1386
1387                         /* Lower rate not available, use the original */
1388                         else
1389                                 break;
1390
1391                 /* Else try to raise the "search" rate to match "active" */
1392                 } else {
1393                         /* (2nd or later pass)
1394                          * If we've already tried to lower the rate, and are
1395                          * now trying to raise it, use the lower rate. */
1396                         if (new_rate != IWL_RATE_INVALID)
1397                                 break;
1398
1399                         /* Loop again with higher rate */
1400                         else if (high != IWL_RATE_INVALID) {
1401                                 start_hi = high;
1402                                 rate = high;
1403
1404                         /* Higher rate not available, use the original */
1405                         } else {
1406                                 new_rate = rate;
1407                                 break;
1408                         }
1409                 }
1410         }
1411
1412         return new_rate;
1413 }
1414
1415 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1416 {
1417         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1418                 return RATE_MCS_CHAN_WIDTH_80;
1419         else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1420                 return RATE_MCS_CHAN_WIDTH_40;
1421
1422         return RATE_MCS_CHAN_WIDTH_20;
1423 }
1424
1425 /*
1426  * Check whether we should continue using same modulation mode, or
1427  * begin search for a new mode, based on:
1428  * 1) # tx successes or failures while using this mode
1429  * 2) # times calling this function
1430  * 3) elapsed time in this mode (not used, for now)
1431  */
1432 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1433 {
1434         struct iwl_scale_tbl_info *tbl;
1435         int active_tbl;
1436         int flush_interval_passed = 0;
1437         struct iwl_mvm *mvm;
1438
1439         mvm = lq_sta->drv;
1440         active_tbl = lq_sta->active_tbl;
1441
1442         tbl = &(lq_sta->lq_info[active_tbl]);
1443
1444         /* If we've been disallowing search, see if we should now allow it */
1445         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1446                 /* Elapsed time using current modulation mode */
1447                 if (lq_sta->flush_timer)
1448                         flush_interval_passed =
1449                                 time_after(jiffies,
1450                                            (unsigned long)(lq_sta->flush_timer +
1451                                                 RS_STAY_IN_COLUMN_TIMEOUT));
1452
1453                 /*
1454                  * Check if we should allow search for new modulation mode.
1455                  * If many frames have failed or succeeded, or we've used
1456                  * this same modulation for a long time, allow search, and
1457                  * reset history stats that keep track of whether we should
1458                  * allow a new search.  Also (below) reset all bitmaps and
1459                  * stats in active history.
1460                  */
1461                 if (force_search ||
1462                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1463                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1464                     ((!lq_sta->search_better_tbl) &&
1465                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1466                         IWL_DEBUG_RATE(mvm,
1467                                        "LQ: stay is expired %d %d %d\n",
1468                                      lq_sta->total_failed,
1469                                      lq_sta->total_success,
1470                                      flush_interval_passed);
1471
1472                         /* Allow search for new mode */
1473                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1474                         IWL_DEBUG_RATE(mvm,
1475                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1476                         lq_sta->total_failed = 0;
1477                         lq_sta->total_success = 0;
1478                         lq_sta->flush_timer = 0;
1479                         /* mark the current column as visited */
1480                         lq_sta->visited_columns = BIT(tbl->column);
1481                 /*
1482                  * Else if we've used this modulation mode enough repetitions
1483                  * (regardless of elapsed time or success/failure), reset
1484                  * history bitmaps and rate-specific stats for all rates in
1485                  * active table.
1486                  */
1487                 } else {
1488                         lq_sta->table_count++;
1489                         if (lq_sta->table_count >=
1490                             lq_sta->table_count_limit) {
1491                                 lq_sta->table_count = 0;
1492
1493                                 IWL_DEBUG_RATE(mvm,
1494                                                "LQ: stay in table clear win\n");
1495                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1496                         }
1497                 }
1498
1499                 /* If transitioning to allow "search", reset all history
1500                  * bitmaps and stats in active table (this will become the new
1501                  * "search" table). */
1502                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1503                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1504                 }
1505         }
1506 }
1507
1508 /*
1509  * setup rate table in uCode
1510  */
1511 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1512                                struct ieee80211_sta *sta,
1513                                struct iwl_lq_sta *lq_sta,
1514                                struct rs_rate *rate)
1515 {
1516         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
1517         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1518 }
1519
1520 static u8 rs_get_tid(struct iwl_lq_sta *lq_data,
1521                      struct ieee80211_hdr *hdr)
1522 {
1523         u8 tid = IWL_MAX_TID_COUNT;
1524
1525         if (ieee80211_is_data_qos(hdr->frame_control)) {
1526                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1527                 tid = qc[0] & 0xf;
1528         }
1529
1530         if (unlikely(tid > IWL_MAX_TID_COUNT))
1531                 tid = IWL_MAX_TID_COUNT;
1532
1533         return tid;
1534 }
1535
1536 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1537                                          struct iwl_lq_sta *lq_sta,
1538                                          struct ieee80211_sta *sta,
1539                                          struct iwl_scale_tbl_info *tbl)
1540 {
1541         int i, j, max_rate;
1542         enum rs_column next_col_id;
1543         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1544         const struct rs_tx_column *next_col;
1545         allow_column_func_t allow_func;
1546         u8 valid_ants = mvm->fw->valid_tx_ant;
1547         const u16 *expected_tpt_tbl;
1548         u16 tpt, max_expected_tpt;
1549
1550         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1551                 next_col_id = curr_col->next_columns[i];
1552
1553                 if (next_col_id == RS_COLUMN_INVALID)
1554                         continue;
1555
1556                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1557                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1558                                        next_col_id);
1559                         continue;
1560                 }
1561
1562                 next_col = &rs_tx_columns[next_col_id];
1563
1564                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1565                         IWL_DEBUG_RATE(mvm,
1566                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1567                                        next_col_id, valid_ants, next_col->ant);
1568                         continue;
1569                 }
1570
1571                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1572                         allow_func = next_col->checks[j];
1573                         if (allow_func && !allow_func(mvm, sta, tbl))
1574                                 break;
1575                 }
1576
1577                 if (j != MAX_COLUMN_CHECKS) {
1578                         IWL_DEBUG_RATE(mvm,
1579                                        "Skip column %d: not allowed (check %d failed)\n",
1580                                        next_col_id, j);
1581
1582                         continue;
1583                 }
1584
1585                 tpt = lq_sta->last_tpt / 100;
1586                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1587                                                              tbl->rate.bw);
1588                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1589                         continue;
1590
1591                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1592                 if (WARN_ON_ONCE(max_rate == IWL_RATE_INVALID))
1593                         continue;
1594
1595                 max_expected_tpt = expected_tpt_tbl[max_rate];
1596                 if (tpt >= max_expected_tpt) {
1597                         IWL_DEBUG_RATE(mvm,
1598                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1599                                        next_col_id, max_expected_tpt, tpt);
1600                         continue;
1601                 }
1602
1603                 IWL_DEBUG_RATE(mvm,
1604                                "Found potential column %d. Max expected %d current %d\n",
1605                                next_col_id, max_expected_tpt, tpt);
1606                 break;
1607         }
1608
1609         if (i == MAX_NEXT_COLUMNS)
1610                 return RS_COLUMN_INVALID;
1611
1612         return next_col_id;
1613 }
1614
1615 static int rs_switch_to_column(struct iwl_mvm *mvm,
1616                                struct iwl_lq_sta *lq_sta,
1617                                struct ieee80211_sta *sta,
1618                                enum rs_column col_id)
1619 {
1620         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1621         struct iwl_scale_tbl_info *search_tbl =
1622                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1623         struct rs_rate *rate = &search_tbl->rate;
1624         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1625         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1626         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1627                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1628         u16 rate_mask = 0;
1629         u32 rate_idx = 0;
1630
1631         memcpy(search_tbl, tbl, sz);
1632
1633         rate->sgi = column->sgi;
1634         rate->ant = column->ant;
1635
1636         if (column->mode == RS_LEGACY) {
1637                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1638                         rate->type = LQ_LEGACY_A;
1639                 else
1640                         rate->type = LQ_LEGACY_G;
1641
1642                 rate_mask = lq_sta->active_legacy_rate;
1643         } else if (column->mode == RS_SISO) {
1644                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1645                 rate_mask = lq_sta->active_siso_rate;
1646         } else if (column->mode == RS_MIMO2) {
1647                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1648                 rate_mask = lq_sta->active_mimo2_rate;
1649         } else {
1650                 WARN_ON_ONCE("Bad column mode");
1651         }
1652
1653         rate->bw = rs_bw_from_sta_bw(sta);
1654         search_tbl->column = col_id;
1655         rs_set_expected_tpt_table(lq_sta, search_tbl);
1656
1657         lq_sta->visited_columns |= BIT(col_id);
1658
1659         /* Get the best matching rate if we're changing modes. e.g.
1660          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1661          */
1662         if (curr_column->mode != column->mode) {
1663                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1664                                             rate_mask, rate->index);
1665
1666                 if ((rate_idx == IWL_RATE_INVALID) ||
1667                     !(BIT(rate_idx) & rate_mask)) {
1668                         IWL_DEBUG_RATE(mvm,
1669                                        "can not switch with index %d"
1670                                        " rate mask %x\n",
1671                                        rate_idx, rate_mask);
1672
1673                         goto err;
1674                 }
1675
1676                 rate->index = rate_idx;
1677         }
1678
1679         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1680                        col_id, rate->index);
1681
1682         return 0;
1683
1684 err:
1685         rate->type = LQ_NONE;
1686         return -1;
1687 }
1688
1689 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1690                                          struct iwl_scale_tbl_info *tbl,
1691                                          s32 sr, int low, int high,
1692                                          int current_tpt,
1693                                          int low_tpt, int high_tpt)
1694 {
1695         enum rs_action action = RS_ACTION_STAY;
1696
1697         if ((sr <= RS_SR_FORCE_DECREASE) || (current_tpt == 0)) {
1698                 IWL_DEBUG_RATE(mvm,
1699                                "Decrease rate because of low SR\n");
1700                 return RS_ACTION_DOWNSCALE;
1701         }
1702
1703         if ((low_tpt == IWL_INVALID_VALUE) &&
1704             (high_tpt == IWL_INVALID_VALUE) &&
1705             (high != IWL_RATE_INVALID)) {
1706                 IWL_DEBUG_RATE(mvm,
1707                                "No data about high/low rates. Increase rate\n");
1708                 return RS_ACTION_UPSCALE;
1709         }
1710
1711         if ((high_tpt == IWL_INVALID_VALUE) &&
1712             (high != IWL_RATE_INVALID) &&
1713             (low_tpt != IWL_INVALID_VALUE) &&
1714             (low_tpt < current_tpt)) {
1715                 IWL_DEBUG_RATE(mvm,
1716                                "No data about high rate and low rate is worse. Increase rate\n");
1717                 return RS_ACTION_UPSCALE;
1718         }
1719
1720         if ((high_tpt != IWL_INVALID_VALUE) &&
1721             (high_tpt > current_tpt)) {
1722                 IWL_DEBUG_RATE(mvm,
1723                                "Higher rate is better. Increate rate\n");
1724                 return RS_ACTION_UPSCALE;
1725         }
1726
1727         if ((low_tpt != IWL_INVALID_VALUE) &&
1728             (high_tpt != IWL_INVALID_VALUE) &&
1729             (low_tpt < current_tpt) &&
1730             (high_tpt < current_tpt)) {
1731                 IWL_DEBUG_RATE(mvm,
1732                                "Both high and low are worse. Maintain rate\n");
1733                 return RS_ACTION_STAY;
1734         }
1735
1736         if ((low_tpt != IWL_INVALID_VALUE) &&
1737             (low_tpt > current_tpt)) {
1738                 IWL_DEBUG_RATE(mvm,
1739                                "Lower rate is better\n");
1740                 action = RS_ACTION_DOWNSCALE;
1741                 goto out;
1742         }
1743
1744         if ((low_tpt == IWL_INVALID_VALUE) &&
1745             (low != IWL_RATE_INVALID)) {
1746                 IWL_DEBUG_RATE(mvm,
1747                                "No data about lower rate\n");
1748                 action = RS_ACTION_DOWNSCALE;
1749                 goto out;
1750         }
1751
1752         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1753
1754 out:
1755         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1756                 if (sr >= RS_SR_NO_DECREASE) {
1757                         IWL_DEBUG_RATE(mvm,
1758                                        "SR is above NO DECREASE. Avoid downscale\n");
1759                         action = RS_ACTION_STAY;
1760                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1761                         IWL_DEBUG_RATE(mvm,
1762                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1763                         action = RS_ACTION_STAY;
1764                 } else {
1765                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1766                 }
1767         }
1768
1769         return action;
1770 }
1771
1772 /*
1773  * Do rate scaling and search for new modulation mode.
1774  */
1775 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1776                                   struct sk_buff *skb,
1777                                   struct ieee80211_sta *sta,
1778                                   struct iwl_lq_sta *lq_sta)
1779 {
1780         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1781         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1782         int low = IWL_RATE_INVALID;
1783         int high = IWL_RATE_INVALID;
1784         int index;
1785         struct iwl_rate_scale_data *window = NULL;
1786         int current_tpt = IWL_INVALID_VALUE;
1787         int low_tpt = IWL_INVALID_VALUE;
1788         int high_tpt = IWL_INVALID_VALUE;
1789         u32 fail_count;
1790         enum rs_action scale_action = RS_ACTION_STAY;
1791         u16 rate_mask;
1792         u8 update_lq = 0;
1793         struct iwl_scale_tbl_info *tbl, *tbl1;
1794         u8 active_tbl = 0;
1795         u8 done_search = 0;
1796         u16 high_low;
1797         s32 sr;
1798         u8 tid = IWL_MAX_TID_COUNT;
1799         u8 prev_agg = lq_sta->is_agg;
1800         struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
1801         struct iwl_mvm_tid_data *tid_data;
1802         struct rs_rate *rate;
1803
1804         /* Send management frames and NO_ACK data using lowest rate. */
1805         /* TODO: this could probably be improved.. */
1806         if (!ieee80211_is_data(hdr->frame_control) ||
1807             info->flags & IEEE80211_TX_CTL_NO_ACK)
1808                 return;
1809
1810         tid = rs_get_tid(lq_sta, hdr);
1811         if ((tid != IWL_MAX_TID_COUNT) &&
1812             (lq_sta->tx_agg_tid_en & (1 << tid))) {
1813                 tid_data = &sta_priv->tid_data[tid];
1814                 if (tid_data->state == IWL_AGG_OFF)
1815                         lq_sta->is_agg = 0;
1816                 else
1817                         lq_sta->is_agg = 1;
1818         } else {
1819                 lq_sta->is_agg = 0;
1820         }
1821
1822         /*
1823          * Select rate-scale / modulation-mode table to work with in
1824          * the rest of this function:  "search" if searching for better
1825          * modulation mode, or "active" if doing rate scaling within a mode.
1826          */
1827         if (!lq_sta->search_better_tbl)
1828                 active_tbl = lq_sta->active_tbl;
1829         else
1830                 active_tbl = 1 - lq_sta->active_tbl;
1831
1832         tbl = &(lq_sta->lq_info[active_tbl]);
1833         rate = &tbl->rate;
1834
1835         if (prev_agg != lq_sta->is_agg) {
1836                 IWL_DEBUG_RATE(mvm,
1837                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
1838                                prev_agg, lq_sta->is_agg);
1839                 rs_set_expected_tpt_table(lq_sta, tbl);
1840                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1841         }
1842
1843         /* current tx rate */
1844         index = lq_sta->last_txrate_idx;
1845
1846         /* rates available for this association, and for modulation mode */
1847         rate_mask = rs_get_supported_rates(lq_sta, rate);
1848
1849         if (!(BIT(index) & rate_mask)) {
1850                 IWL_ERR(mvm, "Current Rate is not valid\n");
1851                 if (lq_sta->search_better_tbl) {
1852                         /* revert to active table if search table is not valid*/
1853                         rate->type = LQ_NONE;
1854                         lq_sta->search_better_tbl = 0;
1855                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1856                         rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
1857                 }
1858                 return;
1859         }
1860
1861         /* Get expected throughput table and history window for current rate */
1862         if (!tbl->expected_tpt) {
1863                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
1864                 return;
1865         }
1866
1867         /* force user max rate if set by user */
1868         if ((lq_sta->max_rate_idx != -1) &&
1869             (lq_sta->max_rate_idx < index)) {
1870                 index = lq_sta->max_rate_idx;
1871                 update_lq = 1;
1872                 window = &(tbl->win[index]);
1873                 IWL_DEBUG_RATE(mvm,
1874                                "Forcing user max rate %d\n",
1875                                index);
1876                 goto lq_update;
1877         }
1878
1879         window = &(tbl->win[index]);
1880
1881         /*
1882          * If there is not enough history to calculate actual average
1883          * throughput, keep analyzing results of more tx frames, without
1884          * changing rate or mode (bypass most of the rest of this function).
1885          * Set up new rate table in uCode only if old rate is not supported
1886          * in current association (use new rate found above).
1887          */
1888         fail_count = window->counter - window->success_counter;
1889         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1890             (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1891                 IWL_DEBUG_RATE(mvm,
1892                                "(%s: %d): Test Window: succ %d total %d\n",
1893                                rs_pretty_lq_type(rate->type),
1894                                index, window->success_counter, window->counter);
1895
1896                 /* Can't calculate this yet; not enough history */
1897                 window->average_tpt = IWL_INVALID_VALUE;
1898
1899                 /* Should we stay with this modulation mode,
1900                  * or search for a new one? */
1901                 rs_stay_in_table(lq_sta, false);
1902
1903                 goto out;
1904         }
1905         /* Else we have enough samples; calculate estimate of
1906          * actual average throughput */
1907         if (window->average_tpt != ((window->success_ratio *
1908                         tbl->expected_tpt[index] + 64) / 128)) {
1909                 window->average_tpt = ((window->success_ratio *
1910                                         tbl->expected_tpt[index] + 64) / 128);
1911         }
1912
1913         /* If we are searching for better modulation mode, check success. */
1914         if (lq_sta->search_better_tbl) {
1915                 /* If good success, continue using the "search" mode;
1916                  * no need to send new link quality command, since we're
1917                  * continuing to use the setup that we've been trying. */
1918                 if (window->average_tpt > lq_sta->last_tpt) {
1919                         IWL_DEBUG_RATE(mvm,
1920                                        "SWITCHING TO NEW TABLE SR: %d "
1921                                        "cur-tpt %d old-tpt %d\n",
1922                                        window->success_ratio,
1923                                        window->average_tpt,
1924                                        lq_sta->last_tpt);
1925
1926                         /* Swap tables; "search" becomes "active" */
1927                         lq_sta->active_tbl = active_tbl;
1928                         current_tpt = window->average_tpt;
1929                 /* Else poor success; go back to mode in "active" table */
1930                 } else {
1931                         IWL_DEBUG_RATE(mvm,
1932                                        "GOING BACK TO THE OLD TABLE: SR %d "
1933                                        "cur-tpt %d old-tpt %d\n",
1934                                        window->success_ratio,
1935                                        window->average_tpt,
1936                                        lq_sta->last_tpt);
1937
1938                         /* Nullify "search" table */
1939                         rate->type = LQ_NONE;
1940
1941                         /* Revert to "active" table */
1942                         active_tbl = lq_sta->active_tbl;
1943                         tbl = &(lq_sta->lq_info[active_tbl]);
1944
1945                         /* Revert to "active" rate and throughput info */
1946                         index = tbl->rate.index;
1947                         current_tpt = lq_sta->last_tpt;
1948
1949                         /* Need to set up a new rate table in uCode */
1950                         update_lq = 1;
1951                 }
1952
1953                 /* Either way, we've made a decision; modulation mode
1954                  * search is done, allow rate adjustment next time. */
1955                 lq_sta->search_better_tbl = 0;
1956                 done_search = 1;        /* Don't switch modes below! */
1957                 goto lq_update;
1958         }
1959
1960         /* (Else) not in search of better modulation mode, try for better
1961          * starting rate, while staying in this mode. */
1962         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
1963         low = high_low & 0xff;
1964         high = (high_low >> 8) & 0xff;
1965
1966         /* If user set max rate, dont allow higher than user constrain */
1967         if ((lq_sta->max_rate_idx != -1) &&
1968             (lq_sta->max_rate_idx < high))
1969                 high = IWL_RATE_INVALID;
1970
1971         sr = window->success_ratio;
1972
1973         /* Collect measured throughputs for current and adjacent rates */
1974         current_tpt = window->average_tpt;
1975         if (low != IWL_RATE_INVALID)
1976                 low_tpt = tbl->win[low].average_tpt;
1977         if (high != IWL_RATE_INVALID)
1978                 high_tpt = tbl->win[high].average_tpt;
1979
1980         IWL_DEBUG_RATE(mvm,
1981                        "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
1982                        rs_pretty_lq_type(rate->type), index, current_tpt, sr,
1983                        low, high, low_tpt, high_tpt);
1984
1985         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
1986                                           current_tpt, low_tpt, high_tpt);
1987
1988         /* Force a search in case BT doesn't like us being in MIMO */
1989         if (is_mimo(rate) &&
1990             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
1991                 IWL_DEBUG_RATE(mvm,
1992                                "BT Coex forbids MIMO. Search for new config\n");
1993                 rs_stay_in_table(lq_sta, true);
1994                 goto lq_update;
1995         }
1996
1997         switch (scale_action) {
1998         case RS_ACTION_DOWNSCALE:
1999                 /* Decrease starting rate, update uCode's rate table */
2000                 if (low != IWL_RATE_INVALID) {
2001                         update_lq = 1;
2002                         index = low;
2003                 } else {
2004                         IWL_DEBUG_RATE(mvm,
2005                                        "At the bottom rate. Can't decrease\n");
2006                 }
2007
2008                 break;
2009         case RS_ACTION_UPSCALE:
2010                 /* Increase starting rate, update uCode's rate table */
2011                 if (high != IWL_RATE_INVALID) {
2012                         update_lq = 1;
2013                         index = high;
2014                 } else {
2015                         IWL_DEBUG_RATE(mvm,
2016                                        "At the top rate. Can't increase\n");
2017                 }
2018
2019                 break;
2020         case RS_ACTION_STAY:
2021                 /* No change */
2022         default:
2023                 break;
2024         }
2025
2026 lq_update:
2027         /* Replace uCode's rate table for the destination station. */
2028         if (update_lq) {
2029                 tbl->rate.index = index;
2030                 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2031         }
2032
2033         rs_stay_in_table(lq_sta, false);
2034
2035         /*
2036          * Search for new modulation mode if we're:
2037          * 1)  Not changing rates right now
2038          * 2)  Not just finishing up a search
2039          * 3)  Allowing a new search
2040          */
2041         if (!update_lq && !done_search &&
2042             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2043             && window->counter) {
2044                 enum rs_column next_column;
2045
2046                 /* Save current throughput to compare with "search" throughput*/
2047                 lq_sta->last_tpt = current_tpt;
2048
2049                 IWL_DEBUG_RATE(mvm,
2050                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2051                                update_lq, done_search, lq_sta->rs_state,
2052                                window->counter);
2053
2054                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2055                 if (next_column != RS_COLUMN_INVALID) {
2056                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2057                                                       next_column);
2058                         if (!ret)
2059                                 lq_sta->search_better_tbl = 1;
2060                 } else {
2061                         IWL_DEBUG_RATE(mvm,
2062                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2063                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2064                 }
2065
2066                 /* If new "search" mode was selected, set up in uCode table */
2067                 if (lq_sta->search_better_tbl) {
2068                         /* Access the "search" table, clear its history. */
2069                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2070                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2071
2072                         /* Use new "search" start rate */
2073                         index = tbl->rate.index;
2074
2075                         rs_dump_rate(mvm, &tbl->rate,
2076                                      "Switch to SEARCH TABLE:");
2077                         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
2078                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2079                 } else {
2080                         done_search = 1;
2081                 }
2082         }
2083
2084         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2085                 /* If the "active" (non-search) mode was legacy,
2086                  * and we've tried switching antennas,
2087                  * but we haven't been able to try HT modes (not available),
2088                  * stay with best antenna legacy modulation for a while
2089                  * before next round of mode comparisons. */
2090                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2091                 if (is_legacy(&tbl1->rate)) {
2092                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2093
2094                         if (tid != IWL_MAX_TID_COUNT) {
2095                                 tid_data = &sta_priv->tid_data[tid];
2096                                 if (tid_data->state != IWL_AGG_OFF) {
2097                                         IWL_DEBUG_RATE(mvm,
2098                                                        "Stop aggregation on tid %d\n",
2099                                                        tid);
2100                                         ieee80211_stop_tx_ba_session(sta, tid);
2101                                 }
2102                         }
2103                         rs_set_stay_in_table(mvm, 1, lq_sta);
2104                 } else {
2105                 /* If we're in an HT mode, and all 3 mode switch actions
2106                  * have been tried and compared, stay in this best modulation
2107                  * mode for a while before next round of mode comparisons. */
2108                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2109                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2110                             (tid != IWL_MAX_TID_COUNT)) {
2111                                 tid_data = &sta_priv->tid_data[tid];
2112                                 if (tid_data->state == IWL_AGG_OFF) {
2113                                         IWL_DEBUG_RATE(mvm,
2114                                                        "try to aggregate tid %d\n",
2115                                                        tid);
2116                                         rs_tl_turn_on_agg(mvm, tid,
2117                                                           lq_sta, sta);
2118                                 }
2119                         }
2120                         rs_set_stay_in_table(mvm, 0, lq_sta);
2121                 }
2122         }
2123
2124 out:
2125         lq_sta->last_txrate_idx = index;
2126 }
2127
2128 /**
2129  * rs_initialize_lq - Initialize a station's hardware rate table
2130  *
2131  * The uCode's station table contains a table of fallback rates
2132  * for automatic fallback during transmission.
2133  *
2134  * NOTE: This sets up a default set of values.  These will be replaced later
2135  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2136  *       rc80211_simple.
2137  *
2138  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2139  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2140  *       which requires station table entry to exist).
2141  */
2142 static void rs_initialize_lq(struct iwl_mvm *mvm,
2143                              struct ieee80211_sta *sta,
2144                              struct iwl_lq_sta *lq_sta,
2145                              enum ieee80211_band band,
2146                              bool init)
2147 {
2148         struct iwl_scale_tbl_info *tbl;
2149         struct rs_rate *rate;
2150         int i;
2151         u8 active_tbl = 0;
2152         u8 valid_tx_ant;
2153
2154         if (!sta || !lq_sta)
2155                 return;
2156
2157         i = lq_sta->last_txrate_idx;
2158
2159         valid_tx_ant = mvm->fw->valid_tx_ant;
2160
2161         if (!lq_sta->search_better_tbl)
2162                 active_tbl = lq_sta->active_tbl;
2163         else
2164                 active_tbl = 1 - lq_sta->active_tbl;
2165
2166         tbl = &(lq_sta->lq_info[active_tbl]);
2167         rate = &tbl->rate;
2168
2169         if ((i < 0) || (i >= IWL_RATE_COUNT))
2170                 i = 0;
2171
2172         rate->index = i;
2173         rate->ant = first_antenna(valid_tx_ant);
2174         rate->sgi = false;
2175         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2176         if (band == IEEE80211_BAND_5GHZ)
2177                 rate->type = LQ_LEGACY_A;
2178         else
2179                 rate->type = LQ_LEGACY_G;
2180
2181         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2182         if (rate->ant == ANT_A)
2183                 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2184         else
2185                 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2186
2187         rs_set_expected_tpt_table(lq_sta, tbl);
2188         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2189         /* TODO restore station should remember the lq cmd */
2190         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2191 }
2192
2193 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2194                         struct ieee80211_tx_rate_control *txrc)
2195 {
2196         struct sk_buff *skb = txrc->skb;
2197         struct ieee80211_supported_band *sband = txrc->sband;
2198         struct iwl_op_mode *op_mode __maybe_unused =
2199                         (struct iwl_op_mode *)mvm_r;
2200         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2201         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2202         struct iwl_lq_sta *lq_sta = mvm_sta;
2203
2204         /* Get max rate if user set max rate */
2205         if (lq_sta) {
2206                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2207                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2208                     (lq_sta->max_rate_idx != -1))
2209                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2210                 if ((lq_sta->max_rate_idx < 0) ||
2211                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2212                         lq_sta->max_rate_idx = -1;
2213         }
2214
2215         /* Treat uninitialized rate scaling data same as non-existing. */
2216         if (lq_sta && !lq_sta->drv) {
2217                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2218                 mvm_sta = NULL;
2219         }
2220
2221         /* Send management frames and NO_ACK data using lowest rate. */
2222         if (rate_control_send_low(sta, mvm_sta, txrc))
2223                 return;
2224
2225         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2226                                   info->band, &info->control.rates[0]);
2227
2228         info->control.rates[0].count = 1;
2229 }
2230
2231 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2232                           gfp_t gfp)
2233 {
2234         struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2235         struct iwl_op_mode *op_mode __maybe_unused =
2236                         (struct iwl_op_mode *)mvm_rate;
2237         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2238
2239         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2240
2241         return &sta_priv->lq_sta;
2242 }
2243
2244 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2245                                        int nss)
2246 {
2247         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2248                 (0x3 << (2 * (nss - 1)));
2249         rx_mcs >>= (2 * (nss - 1));
2250
2251         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2252                 return IWL_RATE_MCS_7_INDEX;
2253         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2254                 return IWL_RATE_MCS_8_INDEX;
2255         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2256                 return IWL_RATE_MCS_9_INDEX;
2257
2258         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2259         return -1;
2260 }
2261
2262 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2263                                      struct ieee80211_sta_vht_cap *vht_cap,
2264                                      struct iwl_lq_sta *lq_sta)
2265 {
2266         int i;
2267         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2268
2269         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2270                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2271                         if (i == IWL_RATE_9M_INDEX)
2272                                 continue;
2273
2274                         /* Disable MCS9 as a workaround */
2275                         if (i == IWL_RATE_MCS_9_INDEX)
2276                                 continue;
2277
2278                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2279                         if (i == IWL_RATE_MCS_9_INDEX &&
2280                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2281                                 continue;
2282
2283                         lq_sta->active_siso_rate |= BIT(i);
2284                 }
2285         }
2286
2287         if (sta->rx_nss < 2)
2288                 return;
2289
2290         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2291         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2292                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2293                         if (i == IWL_RATE_9M_INDEX)
2294                                 continue;
2295
2296                         /* Disable MCS9 as a workaround */
2297                         if (i == IWL_RATE_MCS_9_INDEX)
2298                                 continue;
2299
2300                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2301                         if (i == IWL_RATE_MCS_9_INDEX &&
2302                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2303                                 continue;
2304
2305                         lq_sta->active_mimo2_rate |= BIT(i);
2306                 }
2307         }
2308 }
2309
2310 #ifdef CONFIG_IWLWIFI_DEBUGFS
2311 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm,
2312                                       struct iwl_mvm_frame_stats *stats)
2313 {
2314         spin_lock_bh(&mvm->drv_stats_lock);
2315         memset(stats, 0, sizeof(*stats));
2316         spin_unlock_bh(&mvm->drv_stats_lock);
2317 }
2318
2319 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm,
2320                                 struct iwl_mvm_frame_stats *stats,
2321                                 u32 rate, bool agg)
2322 {
2323         u8 nss = 0, mcs = 0;
2324
2325         spin_lock(&mvm->drv_stats_lock);
2326
2327         if (agg)
2328                 stats->agg_frames++;
2329
2330         stats->success_frames++;
2331
2332         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2333         case RATE_MCS_CHAN_WIDTH_20:
2334                 stats->bw_20_frames++;
2335                 break;
2336         case RATE_MCS_CHAN_WIDTH_40:
2337                 stats->bw_40_frames++;
2338                 break;
2339         case RATE_MCS_CHAN_WIDTH_80:
2340                 stats->bw_80_frames++;
2341                 break;
2342         default:
2343                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2344         }
2345
2346         if (rate & RATE_MCS_HT_MSK) {
2347                 stats->ht_frames++;
2348                 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2349                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2350         } else if (rate & RATE_MCS_VHT_MSK) {
2351                 stats->vht_frames++;
2352                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2353                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2354                        RATE_VHT_MCS_NSS_POS) + 1;
2355         } else {
2356                 stats->legacy_frames++;
2357         }
2358
2359         if (nss == 1)
2360                 stats->siso_frames++;
2361         else if (nss == 2)
2362                 stats->mimo2_frames++;
2363
2364         if (rate & RATE_MCS_SGI_MSK)
2365                 stats->sgi_frames++;
2366         else
2367                 stats->ngi_frames++;
2368
2369         stats->last_rates[stats->last_frame_idx] = rate;
2370         stats->last_frame_idx = (stats->last_frame_idx + 1) %
2371                 ARRAY_SIZE(stats->last_rates);
2372
2373         spin_unlock(&mvm->drv_stats_lock);
2374 }
2375 #endif
2376
2377 /*
2378  * Called after adding a new station to initialize rate scaling
2379  */
2380 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2381                           enum ieee80211_band band, bool init)
2382 {
2383         int i, j;
2384         struct ieee80211_hw *hw = mvm->hw;
2385         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2386         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2387         struct iwl_mvm_sta *sta_priv;
2388         struct iwl_lq_sta *lq_sta;
2389         struct ieee80211_supported_band *sband;
2390         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2391
2392         sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2393         lq_sta = &sta_priv->lq_sta;
2394         memset(lq_sta, 0, sizeof(*lq_sta));
2395
2396         sband = hw->wiphy->bands[band];
2397
2398         lq_sta->lq.sta_id = sta_priv->sta_id;
2399
2400         for (j = 0; j < LQ_SIZE; j++)
2401                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2402
2403         lq_sta->flush_timer = 0;
2404         lq_sta->last_tx = jiffies;
2405
2406         IWL_DEBUG_RATE(mvm,
2407                        "LQ: *** rate scale station global init for station %d ***\n",
2408                        sta_priv->sta_id);
2409         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2410          * the lowest or the highest rate.. Could consider using RSSI from
2411          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2412          * after assoc.. */
2413
2414         lq_sta->max_rate_idx = -1;
2415         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2416         lq_sta->band = sband->band;
2417         /*
2418          * active legacy rates as per supported rates bitmap
2419          */
2420         supp = sta->supp_rates[sband->band];
2421         lq_sta->active_legacy_rate = 0;
2422         for_each_set_bit(i, &supp, BITS_PER_LONG)
2423                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2424
2425         /* TODO: should probably account for rx_highest for both HT/VHT */
2426         if (!vht_cap || !vht_cap->vht_supported) {
2427                 /* active_siso_rate mask includes 9 MBits (bit 5),
2428                  * and CCK (bits 0-3), supp_rates[] does not;
2429                  * shift to convert format, force 9 MBits off.
2430                  */
2431                 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2432                 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2433                 lq_sta->active_siso_rate &= ~((u16)0x2);
2434                 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2435
2436                 /* Same here */
2437                 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2438                 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2439                 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2440                 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2441
2442                 lq_sta->is_vht = false;
2443         } else {
2444                 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2445                 lq_sta->is_vht = true;
2446         }
2447
2448         lq_sta->max_legacy_rate_idx = find_last_bit(&lq_sta->active_legacy_rate,
2449                                                     BITS_PER_LONG);
2450         lq_sta->max_siso_rate_idx = find_last_bit(&lq_sta->active_siso_rate,
2451                                                   BITS_PER_LONG);
2452         lq_sta->max_mimo2_rate_idx = find_last_bit(&lq_sta->active_mimo2_rate,
2453                                                    BITS_PER_LONG);
2454
2455         IWL_DEBUG_RATE(mvm, "RATE MASK: LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d\n",
2456                        lq_sta->active_legacy_rate,
2457                        lq_sta->active_siso_rate,
2458                        lq_sta->active_mimo2_rate,
2459                        lq_sta->is_vht);
2460         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2461                        lq_sta->max_legacy_rate_idx,
2462                        lq_sta->max_siso_rate_idx,
2463                        lq_sta->max_mimo2_rate_idx);
2464
2465         /* These values will be overridden later */
2466         lq_sta->lq.single_stream_ant_msk =
2467                 first_antenna(mvm->fw->valid_tx_ant);
2468         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2469
2470         /* as default allow aggregation for all tids */
2471         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2472         lq_sta->drv = mvm;
2473
2474         /* Set last_txrate_idx to lowest rate */
2475         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2476         if (sband->band == IEEE80211_BAND_5GHZ)
2477                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2478         lq_sta->is_agg = 0;
2479 #ifdef CONFIG_MAC80211_DEBUGFS
2480         lq_sta->dbg_fixed_rate = 0;
2481 #endif
2482 #ifdef CONFIG_IWLWIFI_DEBUGFS
2483         iwl_mvm_reset_frame_stats(mvm, &mvm->drv_rx_stats);
2484 #endif
2485         rs_initialize_lq(mvm, sta, lq_sta, band, init);
2486 }
2487
2488 static void rs_rate_update(void *mvm_r,
2489                            struct ieee80211_supported_band *sband,
2490                            struct cfg80211_chan_def *chandef,
2491                            struct ieee80211_sta *sta, void *priv_sta,
2492                            u32 changed)
2493 {
2494         u8 tid;
2495         struct iwl_op_mode *op_mode  =
2496                         (struct iwl_op_mode *)mvm_r;
2497         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2498
2499         /* Stop any ongoing aggregations as rs starts off assuming no agg */
2500         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2501                 ieee80211_stop_tx_ba_session(sta, tid);
2502
2503         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2504 }
2505
2506 #ifdef CONFIG_MAC80211_DEBUGFS
2507 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2508                                             struct iwl_lq_cmd *lq_cmd,
2509                                             enum ieee80211_band band,
2510                                             u32 ucode_rate)
2511 {
2512         struct rs_rate rate;
2513         int i;
2514         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2515         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2516
2517         for (i = 0; i < num_rates; i++)
2518                 lq_cmd->rs_table[i] = ucode_rate_le32;
2519
2520         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2521
2522         if (is_mimo(&rate))
2523                 lq_cmd->mimo_delim = num_rates - 1;
2524         else
2525                 lq_cmd->mimo_delim = 0;
2526 }
2527 #endif /* CONFIG_MAC80211_DEBUGFS */
2528
2529 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2530                                      struct iwl_lq_sta *lq_sta,
2531                                      struct rs_rate *rate,
2532                                      __le32 *rs_table, int *rs_table_index,
2533                                      int num_rates, int num_retries,
2534                                      u8 valid_tx_ant, bool toggle_ant)
2535 {
2536         int i, j;
2537         __le32 ucode_rate;
2538         bool bottom_reached = false;
2539         int prev_rate_idx = rate->index;
2540         int end = LINK_QUAL_MAX_RETRY_NUM;
2541         int index = *rs_table_index;
2542
2543         for (i = 0; i < num_rates && index < end; i++) {
2544                 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, rate));
2545                 for (j = 0; j < num_retries && index < end; j++, index++)
2546                         rs_table[index] = ucode_rate;
2547
2548                 if (toggle_ant)
2549                         rs_toggle_antenna(valid_tx_ant, rate);
2550
2551                 prev_rate_idx = rate->index;
2552                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2553                 if (bottom_reached && !is_legacy(rate))
2554                         break;
2555         }
2556
2557         if (!bottom_reached)
2558                 rate->index = prev_rate_idx;
2559
2560         *rs_table_index = index;
2561 }
2562
2563 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2564  * column the rate table should look like this:
2565  *
2566  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2567  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2568  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2569  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2570  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2571  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2572  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2573  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2574  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2575  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2576  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2577  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2578  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2579  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2580  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2581  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2582  */
2583 static void rs_build_rates_table(struct iwl_mvm *mvm,
2584                                  struct iwl_lq_sta *lq_sta,
2585                                  const struct rs_rate *initial_rate)
2586 {
2587         struct rs_rate rate;
2588         int num_rates, num_retries, index = 0;
2589         u8 valid_tx_ant = 0;
2590         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2591         bool toggle_ant = false;
2592
2593         memcpy(&rate, initial_rate, sizeof(rate));
2594
2595         valid_tx_ant = mvm->fw->valid_tx_ant;
2596
2597         if (is_siso(&rate)) {
2598                 num_rates = RS_INITIAL_SISO_NUM_RATES;
2599                 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
2600         } else if (is_mimo(&rate)) {
2601                 num_rates = RS_INITIAL_MIMO_NUM_RATES;
2602                 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
2603         } else {
2604                 num_rates = RS_INITIAL_LEGACY_NUM_RATES;
2605                 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2606                 toggle_ant = true;
2607         }
2608
2609         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2610                                  num_rates, num_retries, valid_tx_ant,
2611                                  toggle_ant);
2612
2613         rs_get_lower_rate_down_column(lq_sta, &rate);
2614
2615         if (is_siso(&rate)) {
2616                 num_rates = RS_SECONDARY_SISO_NUM_RATES;
2617                 num_retries = RS_SECONDARY_SISO_RETRIES;
2618                 lq_cmd->mimo_delim = index;
2619         } else if (is_legacy(&rate)) {
2620                 num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2621                 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2622         } else {
2623                 WARN_ON_ONCE(1);
2624         }
2625
2626         toggle_ant = true;
2627
2628         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2629                                  num_rates, num_retries, valid_tx_ant,
2630                                  toggle_ant);
2631
2632         rs_get_lower_rate_down_column(lq_sta, &rate);
2633
2634         num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2635         num_retries = RS_LEGACY_RETRIES_PER_RATE;
2636
2637         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2638                                  num_rates, num_retries, valid_tx_ant,
2639                                  toggle_ant);
2640
2641 }
2642
2643 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
2644                            struct ieee80211_sta *sta,
2645                            struct iwl_lq_sta *lq_sta,
2646                            const struct rs_rate *initial_rate)
2647 {
2648         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2649         u8 ant = initial_rate->ant;
2650
2651 #ifdef CONFIG_MAC80211_DEBUGFS
2652         if (lq_sta->dbg_fixed_rate) {
2653                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
2654                                                 lq_sta->band,
2655                                                 lq_sta->dbg_fixed_rate);
2656                 ant = (lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) >>
2657                         RATE_MCS_ANT_POS;
2658         } else
2659 #endif
2660                 rs_build_rates_table(mvm, lq_sta, initial_rate);
2661
2662         if (num_of_ant(ant) == 1)
2663                 lq_cmd->single_stream_ant_msk = ant;
2664
2665         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2666         lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2667
2668         lq_cmd->agg_time_limit =
2669                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2670
2671         if (sta)
2672                 lq_cmd->agg_time_limit =
2673                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
2674 }
2675
2676 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2677 {
2678         return hw->priv;
2679 }
2680 /* rate scale requires free function to be implemented */
2681 static void rs_free(void *mvm_rate)
2682 {
2683         return;
2684 }
2685
2686 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2687                         void *mvm_sta)
2688 {
2689         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2690         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2691
2692         IWL_DEBUG_RATE(mvm, "enter\n");
2693         IWL_DEBUG_RATE(mvm, "leave\n");
2694 }
2695
2696 #ifdef CONFIG_MAC80211_DEBUGFS
2697 int rs_pretty_print_rate(char *buf, const u32 rate)
2698 {
2699
2700         char *type, *bw;
2701         u8 mcs = 0, nss = 0;
2702         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2703
2704         if (!(rate & RATE_MCS_HT_MSK) &&
2705             !(rate & RATE_MCS_VHT_MSK)) {
2706                 int index = iwl_hwrate_to_plcp_idx(rate);
2707
2708                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
2709                                rs_pretty_ant(ant),
2710                                index == IWL_RATE_INVALID ? "BAD" :
2711                                iwl_rate_mcs[index].mbps);
2712         }
2713
2714         if (rate & RATE_MCS_VHT_MSK) {
2715                 type = "VHT";
2716                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2717                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
2718                        >> RATE_VHT_MCS_NSS_POS) + 1;
2719         } else if (rate & RATE_MCS_HT_MSK) {
2720                 type = "HT";
2721                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
2722         } else {
2723                 type = "Unknown"; /* shouldn't happen */
2724         }
2725
2726         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2727         case RATE_MCS_CHAN_WIDTH_20:
2728                 bw = "20Mhz";
2729                 break;
2730         case RATE_MCS_CHAN_WIDTH_40:
2731                 bw = "40Mhz";
2732                 break;
2733         case RATE_MCS_CHAN_WIDTH_80:
2734                 bw = "80Mhz";
2735                 break;
2736         case RATE_MCS_CHAN_WIDTH_160:
2737                 bw = "160Mhz";
2738                 break;
2739         default:
2740                 bw = "BAD BW";
2741         }
2742
2743         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
2744                        type, rs_pretty_ant(ant), bw, mcs, nss,
2745                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
2746                        (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
2747                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
2748                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
2749                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
2750 }
2751
2752 /**
2753  * Program the device to use fixed rate for frame transmit
2754  * This is for debugging/testing only
2755  * once the device start use fixed rate, we need to reload the module
2756  * to being back the normal operation.
2757  */
2758 static void rs_program_fix_rate(struct iwl_mvm *mvm,
2759                                 struct iwl_lq_sta *lq_sta)
2760 {
2761         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2762         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2763         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2764
2765         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
2766                        lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2767
2768         if (lq_sta->dbg_fixed_rate) {
2769                 struct rs_rate rate;
2770                 rs_rate_from_ucode_rate(lq_sta->dbg_fixed_rate,
2771                                         lq_sta->band, &rate);
2772                 rs_fill_lq_cmd(mvm, NULL, lq_sta, &rate);
2773                 iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, false);
2774         }
2775 }
2776
2777 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2778                         const char __user *user_buf, size_t count, loff_t *ppos)
2779 {
2780         struct iwl_lq_sta *lq_sta = file->private_data;
2781         struct iwl_mvm *mvm;
2782         char buf[64];
2783         size_t buf_size;
2784         u32 parsed_rate;
2785
2786
2787         mvm = lq_sta->drv;
2788         memset(buf, 0, sizeof(buf));
2789         buf_size = min(count, sizeof(buf) -  1);
2790         if (copy_from_user(buf, user_buf, buf_size))
2791                 return -EFAULT;
2792
2793         if (sscanf(buf, "%x", &parsed_rate) == 1)
2794                 lq_sta->dbg_fixed_rate = parsed_rate;
2795         else
2796                 lq_sta->dbg_fixed_rate = 0;
2797
2798         rs_program_fix_rate(mvm, lq_sta);
2799
2800         return count;
2801 }
2802
2803 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2804                         char __user *user_buf, size_t count, loff_t *ppos)
2805 {
2806         char *buff;
2807         int desc = 0;
2808         int i = 0;
2809         ssize_t ret;
2810
2811         struct iwl_lq_sta *lq_sta = file->private_data;
2812         struct iwl_mvm *mvm;
2813         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2814         struct rs_rate *rate = &tbl->rate;
2815         mvm = lq_sta->drv;
2816         buff = kmalloc(2048, GFP_KERNEL);
2817         if (!buff)
2818                 return -ENOMEM;
2819
2820         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2821         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
2822                         lq_sta->total_failed, lq_sta->total_success,
2823                         lq_sta->active_legacy_rate);
2824         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2825                         lq_sta->dbg_fixed_rate);
2826         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2827             (mvm->fw->valid_tx_ant & ANT_A) ? "ANT_A," : "",
2828             (mvm->fw->valid_tx_ant & ANT_B) ? "ANT_B," : "",
2829             (mvm->fw->valid_tx_ant & ANT_C) ? "ANT_C" : "");
2830         desc += sprintf(buff+desc, "lq type %s\n",
2831                         (is_legacy(rate)) ? "legacy" :
2832                         is_vht(rate) ? "VHT" : "HT");
2833         if (!is_legacy(rate)) {
2834                 desc += sprintf(buff+desc, " %s",
2835                    (is_siso(rate)) ? "SISO" : "MIMO2");
2836                    desc += sprintf(buff+desc, " %s",
2837                                    (is_ht20(rate)) ? "20MHz" :
2838                                    (is_ht40(rate)) ? "40MHz" :
2839                                    (is_ht80(rate)) ? "80Mhz" : "BAD BW");
2840                    desc += sprintf(buff+desc, " %s %s\n",
2841                                    (rate->sgi) ? "SGI" : "NGI",
2842                                    (lq_sta->is_agg) ? "AGG on" : "");
2843         }
2844         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2845                         lq_sta->last_rate_n_flags);
2846         desc += sprintf(buff+desc,
2847                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
2848                         lq_sta->lq.flags,
2849                         lq_sta->lq.mimo_delim,
2850                         lq_sta->lq.single_stream_ant_msk,
2851                         lq_sta->lq.dual_stream_ant_msk);
2852
2853         desc += sprintf(buff+desc,
2854                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2855                         le16_to_cpu(lq_sta->lq.agg_time_limit),
2856                         lq_sta->lq.agg_disable_start_th,
2857                         lq_sta->lq.agg_frame_cnt_limit);
2858
2859         desc += sprintf(buff+desc,
2860                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2861                         lq_sta->lq.initial_rate_index[0],
2862                         lq_sta->lq.initial_rate_index[1],
2863                         lq_sta->lq.initial_rate_index[2],
2864                         lq_sta->lq.initial_rate_index[3]);
2865
2866         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2867                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
2868
2869                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
2870                 desc += rs_pretty_print_rate(buff+desc, r);
2871         }
2872
2873         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2874         kfree(buff);
2875         return ret;
2876 }
2877
2878 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2879         .write = rs_sta_dbgfs_scale_table_write,
2880         .read = rs_sta_dbgfs_scale_table_read,
2881         .open = simple_open,
2882         .llseek = default_llseek,
2883 };
2884 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2885                         char __user *user_buf, size_t count, loff_t *ppos)
2886 {
2887         char *buff;
2888         int desc = 0;
2889         int i, j;
2890         ssize_t ret;
2891         struct iwl_scale_tbl_info *tbl;
2892         struct rs_rate *rate;
2893         struct iwl_lq_sta *lq_sta = file->private_data;
2894
2895         buff = kmalloc(1024, GFP_KERNEL);
2896         if (!buff)
2897                 return -ENOMEM;
2898
2899         for (i = 0; i < LQ_SIZE; i++) {
2900                 tbl = &(lq_sta->lq_info[i]);
2901                 rate = &tbl->rate;
2902                 desc += sprintf(buff+desc,
2903                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
2904                                 "index=%d\n",
2905                                 lq_sta->active_tbl == i ? "*" : "x",
2906                                 rate->type,
2907                                 rate->sgi,
2908                                 is_ht20(rate) ? "20Mhz" :
2909                                 is_ht40(rate) ? "40Mhz" :
2910                                 is_ht80(rate) ? "80Mhz" : "ERR",
2911                                 rate->index);
2912                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2913                         desc += sprintf(buff+desc,
2914                                 "counter=%d success=%d %%=%d\n",
2915                                 tbl->win[j].counter,
2916                                 tbl->win[j].success_counter,
2917                                 tbl->win[j].success_ratio);
2918                 }
2919         }
2920         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2921         kfree(buff);
2922         return ret;
2923 }
2924
2925 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2926         .read = rs_sta_dbgfs_stats_table_read,
2927         .open = simple_open,
2928         .llseek = default_llseek,
2929 };
2930
2931 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
2932 {
2933         struct iwl_lq_sta *lq_sta = mvm_sta;
2934         lq_sta->rs_sta_dbgfs_scale_table_file =
2935                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2936                                     lq_sta, &rs_sta_dbgfs_scale_table_ops);
2937         lq_sta->rs_sta_dbgfs_stats_table_file =
2938                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2939                                     lq_sta, &rs_sta_dbgfs_stats_table_ops);
2940         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2941                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2942                                   &lq_sta->tx_agg_tid_en);
2943 }
2944
2945 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
2946 {
2947         struct iwl_lq_sta *lq_sta = mvm_sta;
2948         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2949         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2950         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2951 }
2952 #endif
2953
2954 /*
2955  * Initialization of rate scaling information is done by driver after
2956  * the station is added. Since mac80211 calls this function before a
2957  * station is added we ignore it.
2958  */
2959 static void rs_rate_init_stub(void *mvm_r,
2960                               struct ieee80211_supported_band *sband,
2961                               struct cfg80211_chan_def *chandef,
2962                               struct ieee80211_sta *sta, void *mvm_sta)
2963 {
2964 }
2965
2966 static const struct rate_control_ops rs_mvm_ops = {
2967         .name = RS_NAME,
2968         .tx_status = rs_tx_status,
2969         .get_rate = rs_get_rate,
2970         .rate_init = rs_rate_init_stub,
2971         .alloc = rs_alloc,
2972         .free = rs_free,
2973         .alloc_sta = rs_alloc_sta,
2974         .free_sta = rs_free_sta,
2975         .rate_update = rs_rate_update,
2976 #ifdef CONFIG_MAC80211_DEBUGFS
2977         .add_sta_debugfs = rs_add_debugfs,
2978         .remove_sta_debugfs = rs_remove_debugfs,
2979 #endif
2980 };
2981
2982 int iwl_mvm_rate_control_register(void)
2983 {
2984         return ieee80211_rate_control_register(&rs_mvm_ops);
2985 }
2986
2987 void iwl_mvm_rate_control_unregister(void)
2988 {
2989         ieee80211_rate_control_unregister(&rs_mvm_ops);
2990 }
2991
2992 /**
2993  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
2994  * Tx protection, according to this rquest and previous requests,
2995  * and send the LQ command.
2996  * @mvmsta: The station
2997  * @enable: Enable Tx protection?
2998  */
2999 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3000                           bool enable)
3001 {
3002         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3003
3004         lockdep_assert_held(&mvm->mutex);
3005
3006         if (enable) {
3007                 if (mvmsta->tx_protection == 0)
3008                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
3009                 mvmsta->tx_protection++;
3010         } else {
3011                 mvmsta->tx_protection--;
3012                 if (mvmsta->tx_protection == 0)
3013                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3014         }
3015
3016         return iwl_mvm_send_lq_cmd(mvm, lq, false);
3017 }