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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
   4  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of version 2 of the GNU General Public License as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  18  *
  19  * The full GNU General Public License is included in this distribution in the
  20  * file called LICENSE.
  21  *
  22  * Contact Information:
  23  *  Intel Linux Wireless <ilw@linux.intel.com>
  24  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  25  *
  26  *****************************************************************************/
  27 #include <linux/kernel.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/slab.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37 #include "rs.h"
  38 #include "fw-api.h"
  39 #include "sta.h"
  40 #include "iwl-op-mode.h"
  41 #include "mvm.h"
  42
  43 #define RS_NAME "iwl-mvm-rs"
  44
  45 #define NUM_TRY_BEFORE_ANT_TOGGLE       1
  46 #define RS_LEGACY_RETRIES_PER_RATE      1
  47 #define RS_HT_VHT_RETRIES_PER_RATE      2
  48 #define RS_HT_VHT_RETRIES_PER_RATE_TW   1
  49 #define RS_INITIAL_MIMO_NUM_RATES       3
  50 #define RS_INITIAL_SISO_NUM_RATES       3
  51 #define RS_INITIAL_LEGACY_NUM_RATES     LINK_QUAL_MAX_RETRY_NUM
  52 #define RS_SECONDARY_LEGACY_NUM_RATES   LINK_QUAL_MAX_RETRY_NUM
  53 #define RS_SECONDARY_SISO_NUM_RATES     3
  54 #define RS_SECONDARY_SISO_RETRIES       1
  55
  56 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  57 #define IWL_RATE_MIN_FAILURE_TH         3       /* min failures to calc tpt */
  58 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  59
  60 /* max allowed rate miss before sync LQ cmd */
  61 #define IWL_MISSED_RATE_MAX             15
  62 #define RS_STAY_IN_COLUMN_TIMEOUT       (5*HZ)
  63 #define RS_IDLE_TIMEOUT                 (5*HZ)
  64
  65 static u8 rs_ht_to_legacy[] = {
  66         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  67         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  68         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  69         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  70         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  71         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  72         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  73         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  74         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  75         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  76 };
  77
  78 static const u8 ant_toggle_lookup[] = {
  79         [ANT_NONE] = ANT_NONE,
  80         [ANT_A] = ANT_B,
  81         [ANT_B] = ANT_C,
  82         [ANT_AB] = ANT_BC,
  83         [ANT_C] = ANT_A,
  84         [ANT_AC] = ANT_AB,
  85         [ANT_BC] = ANT_AC,
  86         [ANT_ABC] = ANT_ABC,
  87 };
  88
  89 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  90         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  91                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  92                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  93                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  94                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  95                                     IWL_RATE_##rp##M_INDEX,           \
  96                                     IWL_RATE_##rn##M_INDEX }
  97
  98 #define IWL_DECLARE_MCS_RATE(s)                                           \
  99         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
 100                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
 101                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
 102                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
 103                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
 104                                        IWL_RATE_INVM_INDEX,               \
 105                                        IWL_RATE_INVM_INDEX }
 106
 107 /*
 108  * Parameter order:
 109  *   rate, ht rate, prev rate, next rate
 110  *
 111  * If there isn't a valid next or previous rate then INV is used which
 112  * maps to IWL_RATE_INVALID
 113  *
 114  */
 115 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 116         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 117         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 118         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 119         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 120         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 121         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 122         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 123         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 124         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 125         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 126         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 127         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 128         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 129         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 130         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 131 };
 132
 133 enum rs_action {
 134         RS_ACTION_STAY = 0,
 135         RS_ACTION_DOWNSCALE = -1,
 136         RS_ACTION_UPSCALE = 1,
 137 };
 138
 139 enum rs_column_mode {
 140         RS_INVALID = 0,
 141         RS_LEGACY,
 142         RS_SISO,
 143         RS_MIMO2,
 144 };
 145
 146 #define MAX_NEXT_COLUMNS 7
 147 #define MAX_COLUMN_CHECKS 3
 148
 149 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 150                                      struct ieee80211_sta *sta,
 151                                      struct iwl_scale_tbl_info *tbl);
 152
 153 struct rs_tx_column {
 154         enum rs_column_mode mode;
 155         u8 ant;
 156         bool sgi;
 157         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 158         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 159 };
 160
 161 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 162                           struct iwl_scale_tbl_info *tbl)
 163 {
 164         if (!sta->ht_cap.ht_supported)
 165                 return false;
 166
 167         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 168                 return false;
 169
 170         if (num_of_ant(mvm->fw->valid_tx_ant) < 2)
 171                 return false;
 172
 173         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 174                 return false;
 175
 176         return true;
 177 }
 178
 179 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 180                           struct iwl_scale_tbl_info *tbl)
 181 {
 182         if (!sta->ht_cap.ht_supported)
 183                 return false;
 184
 185         return true;
 186 }
 187
 188 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 189                          struct iwl_scale_tbl_info *tbl)
 190 {
 191         struct rs_rate *rate = &tbl->rate;
 192         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 193         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 194
 195         if (is_ht20(rate) && (ht_cap->cap &
 196                              IEEE80211_HT_CAP_SGI_20))
 197                 return true;
 198         if (is_ht40(rate) && (ht_cap->cap &
 199                              IEEE80211_HT_CAP_SGI_40))
 200                 return true;
 201         if (is_ht80(rate) && (vht_cap->cap &
 202                              IEEE80211_VHT_CAP_SHORT_GI_80))
 203                 return true;
 204
 205         return false;
 206 }
 207
 208 static const struct rs_tx_column rs_tx_columns[] = {
 209         [RS_COLUMN_LEGACY_ANT_A] = {
 210                 .mode = RS_LEGACY,
 211                 .ant = ANT_A,
 212                 .next_columns = {
 213                         RS_COLUMN_LEGACY_ANT_B,
 214                         RS_COLUMN_SISO_ANT_A,
 215                         RS_COLUMN_MIMO2,
 216                         RS_COLUMN_INVALID,
 217                         RS_COLUMN_INVALID,
 218                         RS_COLUMN_INVALID,
 219                         RS_COLUMN_INVALID,
 220                 },
 221         },
 222         [RS_COLUMN_LEGACY_ANT_B] = {
 223                 .mode = RS_LEGACY,
 224                 .ant = ANT_B,
 225                 .next_columns = {
 226                         RS_COLUMN_LEGACY_ANT_A,
 227                         RS_COLUMN_SISO_ANT_B,
 228                         RS_COLUMN_MIMO2,
 229                         RS_COLUMN_INVALID,
 230                         RS_COLUMN_INVALID,
 231                         RS_COLUMN_INVALID,
 232                         RS_COLUMN_INVALID,
 233                 },
 234         },
 235         [RS_COLUMN_SISO_ANT_A] = {
 236                 .mode = RS_SISO,
 237                 .ant = ANT_A,
 238                 .next_columns = {
 239                         RS_COLUMN_SISO_ANT_B,
 240                         RS_COLUMN_MIMO2,
 241                         RS_COLUMN_SISO_ANT_A_SGI,
 242                         RS_COLUMN_LEGACY_ANT_A,
 243                         RS_COLUMN_LEGACY_ANT_B,
 244                         RS_COLUMN_INVALID,
 245                         RS_COLUMN_INVALID,
 246                 },
 247                 .checks = {
 248                         rs_siso_allow,
 249                 },
 250         },
 251         [RS_COLUMN_SISO_ANT_B] = {
 252                 .mode = RS_SISO,
 253                 .ant = ANT_B,
 254                 .next_columns = {
 255                         RS_COLUMN_SISO_ANT_A,
 256                         RS_COLUMN_MIMO2,
 257                         RS_COLUMN_SISO_ANT_B_SGI,
 258                         RS_COLUMN_LEGACY_ANT_A,
 259                         RS_COLUMN_LEGACY_ANT_B,
 260                         RS_COLUMN_INVALID,
 261                         RS_COLUMN_INVALID,
 262                 },
 263                 .checks = {
 264                         rs_siso_allow,
 265                 },
 266         },
 267         [RS_COLUMN_SISO_ANT_A_SGI] = {
 268                 .mode = RS_SISO,
 269                 .ant = ANT_A,
 270                 .sgi = true,
 271                 .next_columns = {
 272                         RS_COLUMN_SISO_ANT_B_SGI,
 273                         RS_COLUMN_MIMO2_SGI,
 274                         RS_COLUMN_SISO_ANT_A,
 275                         RS_COLUMN_LEGACY_ANT_A,
 276                         RS_COLUMN_LEGACY_ANT_B,
 277                         RS_COLUMN_INVALID,
 278                         RS_COLUMN_INVALID,
 279                 },
 280                 .checks = {
 281                         rs_siso_allow,
 282                         rs_sgi_allow,
 283                 },
 284         },
 285         [RS_COLUMN_SISO_ANT_B_SGI] = {
 286                 .mode = RS_SISO,
 287                 .ant = ANT_B,
 288                 .sgi = true,
 289                 .next_columns = {
 290                         RS_COLUMN_SISO_ANT_A_SGI,
 291                         RS_COLUMN_MIMO2_SGI,
 292                         RS_COLUMN_SISO_ANT_B,
 293                         RS_COLUMN_LEGACY_ANT_A,
 294                         RS_COLUMN_LEGACY_ANT_B,
 295                         RS_COLUMN_INVALID,
 296                         RS_COLUMN_INVALID,
 297                 },
 298                 .checks = {
 299                         rs_siso_allow,
 300                         rs_sgi_allow,
 301                 },
 302         },
 303         [RS_COLUMN_MIMO2] = {
 304                 .mode = RS_MIMO2,
 305                 .ant = ANT_AB,
 306                 .next_columns = {
 307                         RS_COLUMN_SISO_ANT_A,
 308                         RS_COLUMN_MIMO2_SGI,
 309                         RS_COLUMN_LEGACY_ANT_A,
 310                         RS_COLUMN_LEGACY_ANT_B,
 311                         RS_COLUMN_INVALID,
 312                         RS_COLUMN_INVALID,
 313                         RS_COLUMN_INVALID,
 314                 },
 315                 .checks = {
 316                         rs_mimo_allow,
 317                 },
 318         },
 319         [RS_COLUMN_MIMO2_SGI] = {
 320                 .mode = RS_MIMO2,
 321                 .ant = ANT_AB,
 322                 .sgi = true,
 323                 .next_columns = {
 324                         RS_COLUMN_SISO_ANT_A_SGI,
 325                         RS_COLUMN_MIMO2,
 326                         RS_COLUMN_LEGACY_ANT_A,
 327                         RS_COLUMN_LEGACY_ANT_B,
 328                         RS_COLUMN_INVALID,
 329                         RS_COLUMN_INVALID,
 330                         RS_COLUMN_INVALID,
 331                 },
 332                 .checks = {
 333                         rs_mimo_allow,
 334                         rs_sgi_allow,
 335                 },
 336         },
 337 };
 338
 339 static inline u8 rs_extract_rate(u32 rate_n_flags)
 340 {
 341         /* also works for HT because bits 7:6 are zero there */
 342         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 343 }
 344
 345 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 346 {
 347         int idx = 0;
 348
 349         if (rate_n_flags & RATE_MCS_HT_MSK) {
 350                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 351                 idx += IWL_RATE_MCS_0_INDEX;
 352
 353                 /* skip 9M not supported in HT*/
 354                 if (idx >= IWL_RATE_9M_INDEX)
 355                         idx += 1;
 356                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 357                         return idx;
 358         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 359                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 360                 idx += IWL_RATE_MCS_0_INDEX;
 361
 362                 /* skip 9M not supported in VHT*/
 363                 if (idx >= IWL_RATE_9M_INDEX)
 364                         idx++;
 365                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 366                         return idx;
 367         } else {
 368                 /* legacy rate format, search for match in table */
 369
 370                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 371                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 372                         if (iwl_rates[idx].plcp == legacy_rate)
 373                                 return idx;
 374         }
 375
 376         return IWL_RATE_INVALID;
 377 }
 378
 379 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 380                                    struct sk_buff *skb,
 381                                    struct ieee80211_sta *sta,
 382                                    struct iwl_lq_sta *lq_sta);
 383 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 384                            struct ieee80211_sta *sta,
 385                            struct iwl_lq_sta *lq_sta,
 386                            const struct rs_rate *initial_rate);
 387 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 388
 389 /**
 390  * The following tables contain the expected throughput metrics for all rates
 391  *
 392  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 393  *
 394  * where invalid entries are zeros.
 395  *
 396  * CCK rates are only valid in legacy table and will only be used in G
 397  * (2.4 GHz) band.
 398  */
 399
 400 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 401         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 402 };
 403
 404 /* Expected TpT tables. 4 indexes:
 405  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 406  */
 407 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 408         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 409         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 410         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 411         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 412 };
 413
 414 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 415         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 416         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 417         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 418         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 419 };
 420
 421 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 422         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 423         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 424         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 425         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 426 };
 427
 428 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 429         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 430         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 431         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 432         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 433 };
 434
 435 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 436         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 437         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 438         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 439         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 440 };
 441
 442 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 443         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 444         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 445         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 446         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 447 };
 448
 449 /* mbps, mcs */
 450 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 451         {  "1", "BPSK DSSS"},
 452         {  "2", "QPSK DSSS"},
 453         {"5.5", "BPSK CCK"},
 454         { "11", "QPSK CCK"},
 455         {  "6", "BPSK 1/2"},
 456         {  "9", "BPSK 1/2"},
 457         { "12", "QPSK 1/2"},
 458         { "18", "QPSK 3/4"},
 459         { "24", "16QAM 1/2"},
 460         { "36", "16QAM 3/4"},
 461         { "48", "64QAM 2/3"},
 462         { "54", "64QAM 3/4"},
 463         { "60", "64QAM 5/6"},
 464 };
 465
 466 #define MCS_INDEX_PER_STREAM    (8)
 467
 468 static const char *rs_pretty_ant(u8 ant)
 469 {
 470         static const char * const ant_name[] = {
 471                 [ANT_NONE] = "None",
 472                 [ANT_A]    = "A",
 473                 [ANT_B]    = "B",
 474                 [ANT_AB]   = "AB",
 475                 [ANT_C]    = "C",
 476                 [ANT_AC]   = "AC",
 477                 [ANT_BC]   = "BC",
 478                 [ANT_ABC]  = "ABC",
 479         };
 480
 481         if (ant > ANT_ABC)
 482                 return "UNKNOWN";
 483
 484         return ant_name[ant];
 485 }
 486
 487 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 488 {
 489         static const char * const lq_types[] = {
 490                 [LQ_NONE] = "NONE",
 491                 [LQ_LEGACY_A] = "LEGACY_A",
 492                 [LQ_LEGACY_G] = "LEGACY_G",
 493                 [LQ_HT_SISO] = "HT SISO",
 494                 [LQ_HT_MIMO2] = "HT MIMO",
 495                 [LQ_VHT_SISO] = "VHT SISO",
 496                 [LQ_VHT_MIMO2] = "VHT MIMO",
 497         };
 498
 499         if (type < LQ_NONE || type >= LQ_MAX)
 500                 return "UNKNOWN";
 501
 502         return lq_types[type];
 503 }
 504
 505 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 506                                 const char *prefix)
 507 {
 508         IWL_DEBUG_RATE(mvm, "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d\n",
 509                        prefix, rs_pretty_lq_type(rate->type),
 510                        rate->index, rs_pretty_ant(rate->ant),
 511                        rate->bw, rate->sgi, rate->ldpc);
 512 }
 513
 514 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 515 {
 516         window->data = 0;
 517         window->success_counter = 0;
 518         window->success_ratio = IWL_INVALID_VALUE;
 519         window->counter = 0;
 520         window->average_tpt = IWL_INVALID_VALUE;
 521 }
 522
 523 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 524                                             struct iwl_scale_tbl_info *tbl)
 525 {
 526         int i;
 527
 528         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 529         for (i = 0; i < IWL_RATE_COUNT; i++)
 530                 rs_rate_scale_clear_window(&tbl->win[i]);
 531
 532         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 533                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 534 }
 535
 536 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 537 {
 538         return (ant_type & valid_antenna) == ant_type;
 539 }
 540
 541 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 542                                       struct iwl_lq_sta *lq_data, u8 tid,
 543                                       struct ieee80211_sta *sta)
 544 {
 545         int ret = -EAGAIN;
 546
 547         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 548                      sta->addr, tid);
 549         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 550         if (ret == -EAGAIN) {
 551                 /*
 552                  * driver and mac80211 is out of sync
 553                  * this might be cause by reloading firmware
 554                  * stop the tx ba session here
 555                  */
 556                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 557                         tid);
 558                 ieee80211_stop_tx_ba_session(sta, tid);
 559         }
 560         return ret;
 561 }
 562
 563 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 564                               struct iwl_lq_sta *lq_data,
 565                               struct ieee80211_sta *sta)
 566 {
 567         if (tid < IWL_MAX_TID_COUNT)
 568                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 569         else
 570                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 571                         tid, IWL_MAX_TID_COUNT);
 572 }
 573
 574 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 575 {
 576         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 577                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 578                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 579 }
 580
 581 /*
 582  * Static function to get the expected throughput from an iwl_scale_tbl_info
 583  * that wraps a NULL pointer check
 584  */
 585 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 586 {
 587         if (tbl->expected_tpt)
 588                 return tbl->expected_tpt[rs_index];
 589         return 0;
 590 }
 591
 592 /**
 593  * rs_collect_tx_data - Update the success/failure sliding window
 594  *
 595  * We keep a sliding window of the last 62 packets transmitted
 596  * at this rate.  window->data contains the bitmask of successful
 597  * packets.
 598  */
 599 static int _rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 600                                int scale_index, int attempts, int successes,
 601                                struct iwl_rate_scale_data *window)
 602 {
 603         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 604         s32 fail_count, tpt;
 605
 606         /* Get expected throughput */
 607         tpt = get_expected_tpt(tbl, scale_index);
 608
 609         /*
 610          * Keep track of only the latest 62 tx frame attempts in this rate's
 611          * history window; anything older isn't really relevant any more.
 612          * If we have filled up the sliding window, drop the oldest attempt;
 613          * if the oldest attempt (highest bit in bitmap) shows "success",
 614          * subtract "1" from the success counter (this is the main reason
 615          * we keep these bitmaps!).
 616          */
 617         while (attempts > 0) {
 618                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 619                         /* remove earliest */
 620                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 621
 622                         if (window->data & mask) {
 623                                 window->data &= ~mask;
 624                                 window->success_counter--;
 625                         }
 626                 }
 627
 628                 /* Increment frames-attempted counter */
 629                 window->counter++;
 630
 631                 /* Shift bitmap by one frame to throw away oldest history */
 632                 window->data <<= 1;
 633
 634                 /* Mark the most recent #successes attempts as successful */
 635                 if (successes > 0) {
 636                         window->success_counter++;
 637                         window->data |= 0x1;
 638                         successes--;
 639                 }
 640
 641                 attempts--;
 642         }
 643
 644         /* Calculate current success ratio, avoid divide-by-0! */
 645         if (window->counter > 0)
 646                 window->success_ratio = 128 * (100 * window->success_counter)
 647                                         / window->counter;
 648         else
 649                 window->success_ratio = IWL_INVALID_VALUE;
 650
 651         fail_count = window->counter - window->success_counter;
 652
 653         /* Calculate average throughput, if we have enough history. */
 654         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 655             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 656                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 657         else
 658                 window->average_tpt = IWL_INVALID_VALUE;
 659
 660         return 0;
 661 }
 662
 663 static int rs_collect_tx_data(struct iwl_lq_sta *lq_sta,
 664                               struct iwl_scale_tbl_info *tbl,
 665                               int scale_index, int attempts, int successes,
 666                               u8 reduced_txp)
 667 {
 668         struct iwl_rate_scale_data *window = NULL;
 669         int ret;
 670
 671         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 672                 return -EINVAL;
 673
 674         if (tbl->column != RS_COLUMN_INVALID) {
 675                 lq_sta->tx_stats[tbl->column][scale_index].total += attempts;
 676                 lq_sta->tx_stats[tbl->column][scale_index].success += successes;
 677         }
 678
 679         /* Select window for current tx bit rate */
 680         window = &(tbl->win[scale_index]);
 681
 682         ret = _rs_collect_tx_data(tbl, scale_index, attempts, successes,
 683                                   window);
 684         if (ret)
 685                 return ret;
 686
 687         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 688                 return -EINVAL;
 689
 690         window = &tbl->tpc_win[reduced_txp];
 691         return _rs_collect_tx_data(tbl, scale_index, attempts, successes,
 692                                    window);
 693 }
 694
 695 /* Convert rs_rate object into ucode rate bitmask */
 696 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 697                                   struct rs_rate *rate)
 698 {
 699         u32 ucode_rate = 0;
 700         int index = rate->index;
 701
 702         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 703                          RATE_MCS_ANT_ABC_MSK);
 704
 705         if (is_legacy(rate)) {
 706                 ucode_rate |= iwl_rates[index].plcp;
 707                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 708                         ucode_rate |= RATE_MCS_CCK_MSK;
 709                 return ucode_rate;
 710         }
 711
 712         if (is_ht(rate)) {
 713                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 714                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 715                         index = IWL_LAST_HT_RATE;
 716                 }
 717                 ucode_rate |= RATE_MCS_HT_MSK;
 718
 719                 if (is_ht_siso(rate))
 720                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 721                 else if (is_ht_mimo2(rate))
 722                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 723                 else
 724                         WARN_ON_ONCE(1);
 725         } else if (is_vht(rate)) {
 726                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 727                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 728                         index = IWL_LAST_VHT_RATE;
 729                 }
 730                 ucode_rate |= RATE_MCS_VHT_MSK;
 731                 if (is_vht_siso(rate))
 732                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 733                 else if (is_vht_mimo2(rate))
 734                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 735                 else
 736                         WARN_ON_ONCE(1);
 737
 738         } else {
 739                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 740         }
 741
 742         ucode_rate |= rate->bw;
 743         if (rate->sgi)
 744                 ucode_rate |= RATE_MCS_SGI_MSK;
 745         if (rate->ldpc)
 746                 ucode_rate |= RATE_MCS_LDPC_MSK;
 747
 748         return ucode_rate;
 749 }
 750
 751 /* Convert a ucode rate into an rs_rate object */
 752 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 753                                    enum ieee80211_band band,
 754                                    struct rs_rate *rate)
 755 {
 756         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 757         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 758         u8 nss;
 759
 760         memset(rate, 0, sizeof(*rate));
 761         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 762
 763         if (rate->index == IWL_RATE_INVALID)
 764                 return -EINVAL;
 765
 766         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 767
 768         /* Legacy */
 769         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 770             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 771                 if (num_of_ant == 1) {
 772                         if (band == IEEE80211_BAND_5GHZ)
 773                                 rate->type = LQ_LEGACY_A;
 774                         else
 775                                 rate->type = LQ_LEGACY_G;
 776                 }
 777
 778                 return 0;
 779         }
 780
 781         /* HT or VHT */
 782         if (ucode_rate & RATE_MCS_SGI_MSK)
 783                 rate->sgi = true;
 784         if (ucode_rate & RATE_MCS_LDPC_MSK)
 785                 rate->ldpc = true;
 786
 787         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 788
 789         if (ucode_rate & RATE_MCS_HT_MSK) {
 790                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 791                        RATE_HT_MCS_NSS_POS) + 1;
 792
 793                 if (nss == 1) {
 794                         rate->type = LQ_HT_SISO;
 795                         WARN_ON_ONCE(num_of_ant != 1);
 796                 } else if (nss == 2) {
 797                         rate->type = LQ_HT_MIMO2;
 798                         WARN_ON_ONCE(num_of_ant != 2);
 799                 } else {
 800                         WARN_ON_ONCE(1);
 801                 }
 802         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 803                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 804                        RATE_VHT_MCS_NSS_POS) + 1;
 805
 806                 if (nss == 1) {
 807                         rate->type = LQ_VHT_SISO;
 808                         WARN_ON_ONCE(num_of_ant != 1);
 809                 } else if (nss == 2) {
 810                         rate->type = LQ_VHT_MIMO2;
 811                         WARN_ON_ONCE(num_of_ant != 2);
 812                 } else {
 813                         WARN_ON_ONCE(1);
 814                 }
 815         }
 816
 817         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
 818         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 819                      !is_vht(rate));
 820
 821         return 0;
 822 }
 823
 824 /* switch to another antenna/antennas and return 1 */
 825 /* if no other valid antenna found, return 0 */
 826 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 827 {
 828         u8 new_ant_type;
 829
 830         if (!rate->ant || rate->ant > ANT_ABC)
 831                 return 0;
 832
 833         if (!rs_is_valid_ant(valid_ant, rate->ant))
 834                 return 0;
 835
 836         new_ant_type = ant_toggle_lookup[rate->ant];
 837
 838         while ((new_ant_type != rate->ant) &&
 839                !rs_is_valid_ant(valid_ant, new_ant_type))
 840                 new_ant_type = ant_toggle_lookup[new_ant_type];
 841
 842         if (new_ant_type == rate->ant)
 843                 return 0;
 844
 845         rate->ant = new_ant_type;
 846
 847         return 1;
 848 }
 849
 850 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 851                                   struct rs_rate *rate)
 852 {
 853         if (is_legacy(rate))
 854                 return lq_sta->active_legacy_rate;
 855         else if (is_siso(rate))
 856                 return lq_sta->active_siso_rate;
 857         else if (is_mimo2(rate))
 858                 return lq_sta->active_mimo2_rate;
 859
 860         WARN_ON_ONCE(1);
 861         return 0;
 862 }
 863
 864 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 865                                 int rate_type)
 866 {
 867         u8 high = IWL_RATE_INVALID;
 868         u8 low = IWL_RATE_INVALID;
 869
 870         /* 802.11A or ht walks to the next literal adjacent rate in
 871          * the rate table */
 872         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 873                 int i;
 874                 u32 mask;
 875
 876                 /* Find the previous rate that is in the rate mask */
 877                 i = index - 1;
 878                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 879                         if (rate_mask & mask) {
 880                                 low = i;
 881                                 break;
 882                         }
 883                 }
 884
 885                 /* Find the next rate that is in the rate mask */
 886                 i = index + 1;
 887                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 888                         if (rate_mask & mask) {
 889                                 high = i;
 890                                 break;
 891                         }
 892                 }
 893
 894                 return (high << 8) | low;
 895         }
 896
 897         low = index;
 898         while (low != IWL_RATE_INVALID) {
 899                 low = iwl_rates[low].prev_rs;
 900                 if (low == IWL_RATE_INVALID)
 901                         break;
 902                 if (rate_mask & (1 << low))
 903                         break;
 904                 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
 905         }
 906
 907         high = index;
 908         while (high != IWL_RATE_INVALID) {
 909                 high = iwl_rates[high].next_rs;
 910                 if (high == IWL_RATE_INVALID)
 911                         break;
 912                 if (rate_mask & (1 << high))
 913                         break;
 914                 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
 915         }
 916
 917         return (high << 8) | low;
 918 }
 919
 920 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
 921                                      struct rs_rate *rate)
 922 {
 923         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
 924 }
 925
 926 /* Get the next supported lower rate in the current column.
 927  * Return true if bottom rate in the current column was reached
 928  */
 929 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
 930                                         struct rs_rate *rate)
 931 {
 932         u8 low;
 933         u16 high_low;
 934         u16 rate_mask;
 935         struct iwl_mvm *mvm = lq_sta->pers.drv;
 936
 937         rate_mask = rs_get_supported_rates(lq_sta, rate);
 938         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
 939                                         rate->type);
 940         low = high_low & 0xff;
 941
 942         /* Bottom rate of column reached */
 943         if (low == IWL_RATE_INVALID)
 944                 return true;
 945
 946         rate->index = low;
 947         return false;
 948 }
 949
 950 /* Get the next rate to use following a column downgrade */
 951 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
 952                                           struct rs_rate *rate)
 953 {
 954         struct iwl_mvm *mvm = lq_sta->pers.drv;
 955
 956         if (is_legacy(rate)) {
 957                 /* No column to downgrade from Legacy */
 958                 return;
 959         } else if (is_siso(rate)) {
 960                 /* Downgrade to Legacy if we were in SISO */
 961                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 962                         rate->type = LQ_LEGACY_A;
 963                 else
 964                         rate->type = LQ_LEGACY_G;
 965
 966                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
 967
 968                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
 969                              rate->index > IWL_RATE_MCS_9_INDEX);
 970
 971                 rate->index = rs_ht_to_legacy[rate->index];
 972                 rate->ldpc = false;
 973         } else {
 974                 /* Downgrade to SISO with same MCS if in MIMO  */
 975                 rate->type = is_vht_mimo2(rate) ?
 976                         LQ_VHT_SISO : LQ_HT_SISO;
 977         }
 978
 979         if (num_of_ant(rate->ant) > 1)
 980                 rate->ant = first_antenna(mvm->fw->valid_tx_ant);
 981
 982         /* Relevant in both switching to SISO or Legacy */
 983         rate->sgi = false;
 984
 985         if (!rs_rate_supported(lq_sta, rate))
 986                 rs_get_lower_rate_in_column(lq_sta, rate);
 987 }
 988
 989 /* Simple function to compare two rate scale table types */
 990 static inline bool rs_rate_match(struct rs_rate *a,
 991                                  struct rs_rate *b)
 992 {
 993         return (a->type == b->type) && (a->ant == b->ant) && (a->sgi == b->sgi);
 994 }
 995
 996 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
 997 {
 998         if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 999                 return RATE_MCS_CHAN_WIDTH_40;
1000         else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
1001                 return RATE_MCS_CHAN_WIDTH_80;
1002         else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
1003                 return RATE_MCS_CHAN_WIDTH_160;
1004
1005         return RATE_MCS_CHAN_WIDTH_20;
1006 }
1007
1008 /*
1009  * mac80211 sends us Tx status
1010  */
1011 static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
1012                          struct ieee80211_sta *sta, void *priv_sta,
1013                          struct sk_buff *skb)
1014 {
1015         int legacy_success;
1016         int retries;
1017         int mac_index, i;
1018         struct iwl_lq_sta *lq_sta = priv_sta;
1019         struct iwl_lq_cmd *table;
1020         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1021         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1022         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1023         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1024         enum mac80211_rate_control_flags mac_flags;
1025         u32 ucode_rate;
1026         struct rs_rate rate;
1027         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1028         u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1029
1030         /* Treat uninitialized rate scaling data same as non-existing. */
1031         if (!lq_sta) {
1032                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1033                 return;
1034         } else if (!lq_sta->pers.drv) {
1035                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1036                 return;
1037         }
1038
1039 #ifdef CONFIG_MAC80211_DEBUGFS
1040         /* Disable last tx check if we are debugging with fixed rate */
1041         if (lq_sta->pers.dbg_fixed_rate) {
1042                 IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n");
1043                 return;
1044         }
1045 #endif
1046         if (!ieee80211_is_data(hdr->frame_control) ||
1047             info->flags & IEEE80211_TX_CTL_NO_ACK)
1048                 return;
1049
1050         /* This packet was aggregated but doesn't carry status info */
1051         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1052             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1053                 return;
1054
1055         /*
1056          * Ignore this Tx frame response if its initial rate doesn't match
1057          * that of latest Link Quality command.  There may be stragglers
1058          * from a previous Link Quality command, but we're no longer interested
1059          * in those; they're either from the "active" mode while we're trying
1060          * to check "search" mode, or a prior "search" mode after we've moved
1061          * to a new "search" mode (which might become the new "active" mode).
1062          */
1063         table = &lq_sta->lq;
1064         ucode_rate = le32_to_cpu(table->rs_table[0]);
1065         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1066         if (info->band == IEEE80211_BAND_5GHZ)
1067                 rate.index -= IWL_FIRST_OFDM_RATE;
1068         mac_flags = info->status.rates[0].flags;
1069         mac_index = info->status.rates[0].idx;
1070         /* For HT packets, map MCS to PLCP */
1071         if (mac_flags & IEEE80211_TX_RC_MCS) {
1072                 /* Remove # of streams */
1073                 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1074                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1075                         mac_index++;
1076                 /*
1077                  * mac80211 HT index is always zero-indexed; we need to move
1078                  * HT OFDM rates after CCK rates in 2.4 GHz band
1079                  */
1080                 if (info->band == IEEE80211_BAND_2GHZ)
1081                         mac_index += IWL_FIRST_OFDM_RATE;
1082         } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1083                 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1084                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1085                         mac_index++;
1086         }
1087
1088         if (time_after(jiffies,
1089                        (unsigned long)(lq_sta->last_tx + RS_IDLE_TIMEOUT))) {
1090                 int tid;
1091                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1092                 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
1093                         ieee80211_stop_tx_ba_session(sta, tid);
1094
1095                 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
1096                 return;
1097         }
1098         lq_sta->last_tx = jiffies;
1099
1100         /* Here we actually compare this rate to the latest LQ command */
1101         if ((mac_index < 0) ||
1102             (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1103             (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1104             (rate.ant != info->status.antenna) ||
1105             (!!(ucode_rate & RATE_MCS_HT_MSK) !=
1106              !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
1107             (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
1108              !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
1109             (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
1110              !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
1111             (rate.index != mac_index)) {
1112                 IWL_DEBUG_RATE(mvm,
1113                                "initial rate %d does not match %d (0x%x)\n",
1114                                mac_index, rate.index, ucode_rate);
1115                 /*
1116                  * Since rates mis-match, the last LQ command may have failed.
1117                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1118                  * ... driver.
1119                  */
1120                 lq_sta->missed_rate_counter++;
1121                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
1122                         lq_sta->missed_rate_counter = 0;
1123                         IWL_DEBUG_RATE(mvm,
1124                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1125                                        lq_sta->rs_state);
1126                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1127                 }
1128                 /* Regardless, ignore this status info for outdated rate */
1129                 return;
1130         } else
1131                 /* Rate did match, so reset the missed_rate_counter */
1132                 lq_sta->missed_rate_counter = 0;
1133
1134         /* Figure out if rate scale algorithm is in active or search table */
1135         if (rs_rate_match(&rate,
1136                           &(lq_sta->lq_info[lq_sta->active_tbl].rate))) {
1137                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1138                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1139         } else if (rs_rate_match(&rate,
1140                          &lq_sta->lq_info[1 - lq_sta->active_tbl].rate)) {
1141                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1142                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1143         } else {
1144                 IWL_DEBUG_RATE(mvm,
1145                                "Neither active nor search matches tx rate\n");
1146                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1147                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1148                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1149                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1150                 rs_dump_rate(mvm, &rate, "ACTUAL");
1151
1152                 /*
1153                  * no matching table found, let's by-pass the data collection
1154                  * and continue to perform rate scale to find the rate table
1155                  */
1156                 rs_stay_in_table(lq_sta, true);
1157                 goto done;
1158         }
1159
1160         /*
1161          * Updating the frame history depends on whether packets were
1162          * aggregated.
1163          *
1164          * For aggregation, all packets were transmitted at the same rate, the
1165          * first index into rate scale table.
1166          */
1167         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1168                 ucode_rate = le32_to_cpu(table->rs_table[0]);
1169                 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1170                 rs_collect_tx_data(lq_sta, curr_tbl, rate.index,
1171                                    info->status.ampdu_len,
1172                                    info->status.ampdu_ack_len,
1173                                    reduced_txp);
1174
1175                 /* Update success/fail counts if not searching for new mode */
1176                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1177                         lq_sta->total_success += info->status.ampdu_ack_len;
1178                         lq_sta->total_failed += (info->status.ampdu_len -
1179                                         info->status.ampdu_ack_len);
1180                 }
1181         } else {
1182         /*
1183          * For legacy, update frame history with for each Tx retry.
1184          */
1185                 retries = info->status.rates[0].count - 1;
1186                 /* HW doesn't send more than 15 retries */
1187                 retries = min(retries, 15);
1188
1189                 /* The last transmission may have been successful */
1190                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1191                 /* Collect data for each rate used during failed TX attempts */
1192                 for (i = 0; i <= retries; ++i) {
1193                         ucode_rate = le32_to_cpu(table->rs_table[i]);
1194                         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1195                         /*
1196                          * Only collect stats if retried rate is in the same RS
1197                          * table as active/search.
1198                          */
1199                         if (rs_rate_match(&rate, &curr_tbl->rate))
1200                                 tmp_tbl = curr_tbl;
1201                         else if (rs_rate_match(&rate, &other_tbl->rate))
1202                                 tmp_tbl = other_tbl;
1203                         else
1204                                 continue;
1205
1206                         rs_collect_tx_data(lq_sta, tmp_tbl, rate.index, 1,
1207                                            i < retries ? 0 : legacy_success,
1208                                            reduced_txp);
1209                 }
1210
1211                 /* Update success/fail counts if not searching for new mode */
1212                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1213                         lq_sta->total_success += legacy_success;
1214                         lq_sta->total_failed += retries + (1 - legacy_success);
1215                 }
1216         }
1217         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1218         lq_sta->last_rate_n_flags = ucode_rate;
1219         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1220 done:
1221         /* See if there's a better rate or modulation mode to try. */
1222         if (sta && sta->supp_rates[sband->band])
1223                 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
1224 }
1225
1226 /*
1227  * Begin a period of staying with a selected modulation mode.
1228  * Set "stay_in_tbl" flag to prevent any mode switches.
1229  * Set frame tx success limits according to legacy vs. high-throughput,
1230  * and reset overall (spanning all rates) tx success history statistics.
1231  * These control how long we stay using same modulation mode before
1232  * searching for a new mode.
1233  */
1234 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1235                                  struct iwl_lq_sta *lq_sta)
1236 {
1237         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1238         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1239         if (is_legacy) {
1240                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1241                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1242                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1243         } else {
1244                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1245                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1246                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1247         }
1248         lq_sta->table_count = 0;
1249         lq_sta->total_failed = 0;
1250         lq_sta->total_success = 0;
1251         lq_sta->flush_timer = jiffies;
1252         lq_sta->visited_columns = 0;
1253 }
1254
1255 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1256                                    const struct rs_tx_column *column)
1257 {
1258         switch (column->mode) {
1259         case RS_LEGACY:
1260                 return lq_sta->max_legacy_rate_idx;
1261         case RS_SISO:
1262                 return lq_sta->max_siso_rate_idx;
1263         case RS_MIMO2:
1264                 return lq_sta->max_mimo2_rate_idx;
1265         default:
1266                 WARN_ON_ONCE(1);
1267         }
1268
1269         return lq_sta->max_legacy_rate_idx;
1270 }
1271
1272 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1273                                             const struct rs_tx_column *column,
1274                                             u32 bw)
1275 {
1276         /* Used to choose among HT tables */
1277         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1278
1279         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1280                          column->mode != RS_SISO &&
1281                          column->mode != RS_MIMO2))
1282                 return expected_tpt_legacy;
1283
1284         /* Legacy rates have only one table */
1285         if (column->mode == RS_LEGACY)
1286                 return expected_tpt_legacy;
1287
1288         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1289         /* Choose among many HT tables depending on number of streams
1290          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1291          * status */
1292         if (column->mode == RS_SISO) {
1293                 switch (bw) {
1294                 case RATE_MCS_CHAN_WIDTH_20:
1295                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1296                         break;
1297                 case RATE_MCS_CHAN_WIDTH_40:
1298                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1299                         break;
1300                 case RATE_MCS_CHAN_WIDTH_80:
1301                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1302                         break;
1303                 default:
1304                         WARN_ON_ONCE(1);
1305                 }
1306         } else if (column->mode == RS_MIMO2) {
1307                 switch (bw) {
1308                 case RATE_MCS_CHAN_WIDTH_20:
1309                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1310                         break;
1311                 case RATE_MCS_CHAN_WIDTH_40:
1312                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1313                         break;
1314                 case RATE_MCS_CHAN_WIDTH_80:
1315                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1316                         break;
1317                 default:
1318                         WARN_ON_ONCE(1);
1319                 }
1320         } else {
1321                 WARN_ON_ONCE(1);
1322         }
1323
1324         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1325                 return ht_tbl_pointer[0];
1326         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1327                 return ht_tbl_pointer[1];
1328         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1329                 return ht_tbl_pointer[2];
1330         else                                            /* AGG+SGI */
1331                 return ht_tbl_pointer[3];
1332 }
1333
1334 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1335                                       struct iwl_scale_tbl_info *tbl)
1336 {
1337         struct rs_rate *rate = &tbl->rate;
1338         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1339
1340         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1341 }
1342
1343 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1344                             struct iwl_lq_sta *lq_sta,
1345                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1346                             unsigned long rate_mask, s8 index)
1347 {
1348         struct iwl_scale_tbl_info *active_tbl =
1349             &(lq_sta->lq_info[lq_sta->active_tbl]);
1350         s32 success_ratio = active_tbl->win[index].success_ratio;
1351         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1352         const u16 *tpt_tbl = tbl->expected_tpt;
1353         u16 high_low;
1354         u32 target_tpt;
1355         int rate_idx;
1356
1357         if (success_ratio > RS_SR_NO_DECREASE) {
1358                 target_tpt = 100 * expected_current_tpt;
1359                 IWL_DEBUG_RATE(mvm,
1360                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1361                                success_ratio, target_tpt);
1362         } else {
1363                 target_tpt = lq_sta->last_tpt;
1364                 IWL_DEBUG_RATE(mvm,
1365                                "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1366                                success_ratio, target_tpt);
1367         }
1368
1369         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1370
1371         while (rate_idx != IWL_RATE_INVALID) {
1372                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1373                         break;
1374
1375                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1376                                                 tbl->rate.type);
1377
1378                 rate_idx = (high_low >> 8) & 0xff;
1379         }
1380
1381         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1382                        rate_idx, target_tpt,
1383                        rate_idx != IWL_RATE_INVALID ?
1384                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1385
1386         return rate_idx;
1387 }
1388
1389 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1390 {
1391         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1392                 return RATE_MCS_CHAN_WIDTH_80;
1393         else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1394                 return RATE_MCS_CHAN_WIDTH_40;
1395
1396         return RATE_MCS_CHAN_WIDTH_20;
1397 }
1398
1399 /*
1400  * Check whether we should continue using same modulation mode, or
1401  * begin search for a new mode, based on:
1402  * 1) # tx successes or failures while using this mode
1403  * 2) # times calling this function
1404  * 3) elapsed time in this mode (not used, for now)
1405  */
1406 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1407 {
1408         struct iwl_scale_tbl_info *tbl;
1409         int active_tbl;
1410         int flush_interval_passed = 0;
1411         struct iwl_mvm *mvm;
1412
1413         mvm = lq_sta->pers.drv;
1414         active_tbl = lq_sta->active_tbl;
1415
1416         tbl = &(lq_sta->lq_info[active_tbl]);
1417
1418         /* If we've been disallowing search, see if we should now allow it */
1419         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1420                 /* Elapsed time using current modulation mode */
1421                 if (lq_sta->flush_timer)
1422                         flush_interval_passed =
1423                                 time_after(jiffies,
1424                                            (unsigned long)(lq_sta->flush_timer +
1425                                                 RS_STAY_IN_COLUMN_TIMEOUT));
1426
1427                 /*
1428                  * Check if we should allow search for new modulation mode.
1429                  * If many frames have failed or succeeded, or we've used
1430                  * this same modulation for a long time, allow search, and
1431                  * reset history stats that keep track of whether we should
1432                  * allow a new search.  Also (below) reset all bitmaps and
1433                  * stats in active history.
1434                  */
1435                 if (force_search ||
1436                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1437                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1438                     ((!lq_sta->search_better_tbl) &&
1439                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1440                         IWL_DEBUG_RATE(mvm,
1441                                        "LQ: stay is expired %d %d %d\n",
1442                                      lq_sta->total_failed,
1443                                      lq_sta->total_success,
1444                                      flush_interval_passed);
1445
1446                         /* Allow search for new mode */
1447                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1448                         IWL_DEBUG_RATE(mvm,
1449                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1450                         lq_sta->total_failed = 0;
1451                         lq_sta->total_success = 0;
1452                         lq_sta->flush_timer = 0;
1453                         /* mark the current column as visited */
1454                         lq_sta->visited_columns = BIT(tbl->column);
1455                 /*
1456                  * Else if we've used this modulation mode enough repetitions
1457                  * (regardless of elapsed time or success/failure), reset
1458                  * history bitmaps and rate-specific stats for all rates in
1459                  * active table.
1460                  */
1461                 } else {
1462                         lq_sta->table_count++;
1463                         if (lq_sta->table_count >=
1464                             lq_sta->table_count_limit) {
1465                                 lq_sta->table_count = 0;
1466
1467                                 IWL_DEBUG_RATE(mvm,
1468                                                "LQ: stay in table clear win\n");
1469                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1470                         }
1471                 }
1472
1473                 /* If transitioning to allow "search", reset all history
1474                  * bitmaps and stats in active table (this will become the new
1475                  * "search" table). */
1476                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1477                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1478                 }
1479         }
1480 }
1481
1482 /*
1483  * setup rate table in uCode
1484  */
1485 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1486                                struct ieee80211_sta *sta,
1487                                struct iwl_lq_sta *lq_sta,
1488                                struct rs_rate *rate)
1489 {
1490         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
1491         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1492 }
1493
1494 static u8 rs_get_tid(struct iwl_lq_sta *lq_data,
1495                      struct ieee80211_hdr *hdr)
1496 {
1497         u8 tid = IWL_MAX_TID_COUNT;
1498
1499         if (ieee80211_is_data_qos(hdr->frame_control)) {
1500                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1501                 tid = qc[0] & 0xf;
1502         }
1503
1504         if (unlikely(tid > IWL_MAX_TID_COUNT))
1505                 tid = IWL_MAX_TID_COUNT;
1506
1507         return tid;
1508 }
1509
1510 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1511                                          struct iwl_lq_sta *lq_sta,
1512                                          struct ieee80211_sta *sta,
1513                                          struct iwl_scale_tbl_info *tbl)
1514 {
1515         int i, j, max_rate;
1516         enum rs_column next_col_id;
1517         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1518         const struct rs_tx_column *next_col;
1519         allow_column_func_t allow_func;
1520         u8 valid_ants = mvm->fw->valid_tx_ant;
1521         const u16 *expected_tpt_tbl;
1522         u16 tpt, max_expected_tpt;
1523
1524         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1525                 next_col_id = curr_col->next_columns[i];
1526
1527                 if (next_col_id == RS_COLUMN_INVALID)
1528                         continue;
1529
1530                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1531                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1532                                        next_col_id);
1533                         continue;
1534                 }
1535
1536                 next_col = &rs_tx_columns[next_col_id];
1537
1538                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1539                         IWL_DEBUG_RATE(mvm,
1540                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1541                                        next_col_id, valid_ants, next_col->ant);
1542                         continue;
1543                 }
1544
1545                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1546                         allow_func = next_col->checks[j];
1547                         if (allow_func && !allow_func(mvm, sta, tbl))
1548                                 break;
1549                 }
1550
1551                 if (j != MAX_COLUMN_CHECKS) {
1552                         IWL_DEBUG_RATE(mvm,
1553                                        "Skip column %d: not allowed (check %d failed)\n",
1554                                        next_col_id, j);
1555
1556                         continue;
1557                 }
1558
1559                 tpt = lq_sta->last_tpt / 100;
1560                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1561                                                      rs_bw_from_sta_bw(sta));
1562                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1563                         continue;
1564
1565                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1566                 if (WARN_ON_ONCE(max_rate == IWL_RATE_INVALID))
1567                         continue;
1568
1569                 max_expected_tpt = expected_tpt_tbl[max_rate];
1570                 if (tpt >= max_expected_tpt) {
1571                         IWL_DEBUG_RATE(mvm,
1572                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1573                                        next_col_id, max_expected_tpt, tpt);
1574                         continue;
1575                 }
1576
1577                 IWL_DEBUG_RATE(mvm,
1578                                "Found potential column %d. Max expected %d current %d\n",
1579                                next_col_id, max_expected_tpt, tpt);
1580                 break;
1581         }
1582
1583         if (i == MAX_NEXT_COLUMNS)
1584                 return RS_COLUMN_INVALID;
1585
1586         return next_col_id;
1587 }
1588
1589 static int rs_switch_to_column(struct iwl_mvm *mvm,
1590                                struct iwl_lq_sta *lq_sta,
1591                                struct ieee80211_sta *sta,
1592                                enum rs_column col_id)
1593 {
1594         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1595         struct iwl_scale_tbl_info *search_tbl =
1596                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1597         struct rs_rate *rate = &search_tbl->rate;
1598         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1599         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1600         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1601                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1602         unsigned long rate_mask = 0;
1603         u32 rate_idx = 0;
1604
1605         memcpy(search_tbl, tbl, sz);
1606
1607         rate->sgi = column->sgi;
1608         rate->ant = column->ant;
1609
1610         if (column->mode == RS_LEGACY) {
1611                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1612                         rate->type = LQ_LEGACY_A;
1613                 else
1614                         rate->type = LQ_LEGACY_G;
1615
1616                 rate_mask = lq_sta->active_legacy_rate;
1617         } else if (column->mode == RS_SISO) {
1618                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1619                 rate_mask = lq_sta->active_siso_rate;
1620         } else if (column->mode == RS_MIMO2) {
1621                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1622                 rate_mask = lq_sta->active_mimo2_rate;
1623         } else {
1624                 WARN_ON_ONCE("Bad column mode");
1625         }
1626
1627         rate->bw = rs_bw_from_sta_bw(sta);
1628         rate->ldpc = lq_sta->ldpc;
1629         search_tbl->column = col_id;
1630         rs_set_expected_tpt_table(lq_sta, search_tbl);
1631
1632         lq_sta->visited_columns |= BIT(col_id);
1633
1634         /* Get the best matching rate if we're changing modes. e.g.
1635          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1636          */
1637         if (curr_column->mode != column->mode) {
1638                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1639                                             rate_mask, rate->index);
1640
1641                 if ((rate_idx == IWL_RATE_INVALID) ||
1642                     !(BIT(rate_idx) & rate_mask)) {
1643                         IWL_DEBUG_RATE(mvm,
1644                                        "can not switch with index %d"
1645                                        " rate mask %lx\n",
1646                                        rate_idx, rate_mask);
1647
1648                         goto err;
1649                 }
1650
1651                 rate->index = rate_idx;
1652         }
1653
1654         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1655                        col_id, rate->index);
1656
1657         return 0;
1658
1659 err:
1660         rate->type = LQ_NONE;
1661         return -1;
1662 }
1663
1664 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1665                                          struct iwl_scale_tbl_info *tbl,
1666                                          s32 sr, int low, int high,
1667                                          int current_tpt,
1668                                          int low_tpt, int high_tpt)
1669 {
1670         enum rs_action action = RS_ACTION_STAY;
1671
1672         if ((sr <= RS_SR_FORCE_DECREASE) || (current_tpt == 0)) {
1673                 IWL_DEBUG_RATE(mvm,
1674                                "Decrease rate because of low SR\n");
1675                 return RS_ACTION_DOWNSCALE;
1676         }
1677
1678         if ((low_tpt == IWL_INVALID_VALUE) &&
1679             (high_tpt == IWL_INVALID_VALUE) &&
1680             (high != IWL_RATE_INVALID)) {
1681                 IWL_DEBUG_RATE(mvm,
1682                                "No data about high/low rates. Increase rate\n");
1683                 return RS_ACTION_UPSCALE;
1684         }
1685
1686         if ((high_tpt == IWL_INVALID_VALUE) &&
1687             (high != IWL_RATE_INVALID) &&
1688             (low_tpt != IWL_INVALID_VALUE) &&
1689             (low_tpt < current_tpt)) {
1690                 IWL_DEBUG_RATE(mvm,
1691                                "No data about high rate and low rate is worse. Increase rate\n");
1692                 return RS_ACTION_UPSCALE;
1693         }
1694
1695         if ((high_tpt != IWL_INVALID_VALUE) &&
1696             (high_tpt > current_tpt)) {
1697                 IWL_DEBUG_RATE(mvm,
1698                                "Higher rate is better. Increate rate\n");
1699                 return RS_ACTION_UPSCALE;
1700         }
1701
1702         if ((low_tpt != IWL_INVALID_VALUE) &&
1703             (high_tpt != IWL_INVALID_VALUE) &&
1704             (low_tpt < current_tpt) &&
1705             (high_tpt < current_tpt)) {
1706                 IWL_DEBUG_RATE(mvm,
1707                                "Both high and low are worse. Maintain rate\n");
1708                 return RS_ACTION_STAY;
1709         }
1710
1711         if ((low_tpt != IWL_INVALID_VALUE) &&
1712             (low_tpt > current_tpt)) {
1713                 IWL_DEBUG_RATE(mvm,
1714                                "Lower rate is better\n");
1715                 action = RS_ACTION_DOWNSCALE;
1716                 goto out;
1717         }
1718
1719         if ((low_tpt == IWL_INVALID_VALUE) &&
1720             (low != IWL_RATE_INVALID)) {
1721                 IWL_DEBUG_RATE(mvm,
1722                                "No data about lower rate\n");
1723                 action = RS_ACTION_DOWNSCALE;
1724                 goto out;
1725         }
1726
1727         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1728
1729 out:
1730         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1731                 if (sr >= RS_SR_NO_DECREASE) {
1732                         IWL_DEBUG_RATE(mvm,
1733                                        "SR is above NO DECREASE. Avoid downscale\n");
1734                         action = RS_ACTION_STAY;
1735                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1736                         IWL_DEBUG_RATE(mvm,
1737                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1738                         action = RS_ACTION_STAY;
1739                 } else {
1740                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1741                 }
1742         }
1743
1744         return action;
1745 }
1746
1747 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1748                                 int *weaker, int *stronger)
1749 {
1750         *weaker = index + TPC_TX_POWER_STEP;
1751         if (*weaker > TPC_MAX_REDUCTION)
1752                 *weaker = TPC_INVALID;
1753
1754         *stronger = index - TPC_TX_POWER_STEP;
1755         if (*stronger < 0)
1756                 *stronger = TPC_INVALID;
1757 }
1758
1759 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1760                            struct rs_rate *rate, enum ieee80211_band band)
1761 {
1762         int index = rate->index;
1763         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1764         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1765                                 !vif->bss_conf.ps);
1766
1767         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1768                        cam, sta_ps_disabled);
1769         /*
1770          * allow tpc only if power management is enabled, or bt coex
1771          * activity grade allows it and we are on 2.4Ghz.
1772          */
1773         if ((cam || sta_ps_disabled) &&
1774             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1775                 return false;
1776
1777         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1778         if (is_legacy(rate))
1779                 return index == IWL_RATE_54M_INDEX;
1780         if (is_ht(rate))
1781                 return index == IWL_RATE_MCS_7_INDEX;
1782         if (is_vht(rate))
1783                 return index == IWL_RATE_MCS_7_INDEX ||
1784                        index == IWL_RATE_MCS_8_INDEX ||
1785                        index == IWL_RATE_MCS_9_INDEX;
1786
1787         WARN_ON_ONCE(1);
1788         return false;
1789 }
1790
1791 enum tpc_action {
1792         TPC_ACTION_STAY,
1793         TPC_ACTION_DECREASE,
1794         TPC_ACTION_INCREASE,
1795         TPC_ACTION_NO_RESTIRCTION,
1796 };
1797
1798 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1799                                          s32 sr, int weak, int strong,
1800                                          int current_tpt,
1801                                          int weak_tpt, int strong_tpt)
1802 {
1803         /* stay until we have valid tpt */
1804         if (current_tpt == IWL_INVALID_VALUE) {
1805                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1806                 return TPC_ACTION_STAY;
1807         }
1808
1809         /* Too many failures, increase txp */
1810         if (sr <= TPC_SR_FORCE_INCREASE || current_tpt == 0) {
1811                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1812                 return TPC_ACTION_NO_RESTIRCTION;
1813         }
1814
1815         /* try decreasing first if applicable */
1816         if (weak != TPC_INVALID) {
1817                 if (weak_tpt == IWL_INVALID_VALUE &&
1818                     (strong_tpt == IWL_INVALID_VALUE ||
1819                      current_tpt >= strong_tpt)) {
1820                         IWL_DEBUG_RATE(mvm,
1821                                        "no weak txp measurement. decrease txp\n");
1822                         return TPC_ACTION_DECREASE;
1823                 }
1824
1825                 if (weak_tpt > current_tpt) {
1826                         IWL_DEBUG_RATE(mvm,
1827                                        "lower txp has better tpt. decrease txp\n");
1828                         return TPC_ACTION_DECREASE;
1829                 }
1830         }
1831
1832         /* next, increase if needed */
1833         if (sr < TPC_SR_NO_INCREASE && strong != TPC_INVALID) {
1834                 if (weak_tpt == IWL_INVALID_VALUE &&
1835                     strong_tpt != IWL_INVALID_VALUE &&
1836                     current_tpt < strong_tpt) {
1837                         IWL_DEBUG_RATE(mvm,
1838                                        "higher txp has better tpt. increase txp\n");
1839                         return TPC_ACTION_INCREASE;
1840                 }
1841
1842                 if (weak_tpt < current_tpt &&
1843                     (strong_tpt == IWL_INVALID_VALUE ||
1844                      strong_tpt > current_tpt)) {
1845                         IWL_DEBUG_RATE(mvm,
1846                                        "lower txp has worse tpt. increase txp\n");
1847                         return TPC_ACTION_INCREASE;
1848                 }
1849         }
1850
1851         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1852         return TPC_ACTION_STAY;
1853 }
1854
1855 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1856                            struct ieee80211_sta *sta,
1857                            struct iwl_lq_sta *lq_sta,
1858                            struct iwl_scale_tbl_info *tbl)
1859 {
1860         struct iwl_mvm_sta *mvm_sta = (void *)sta->drv_priv;
1861         struct ieee80211_vif *vif = mvm_sta->vif;
1862         struct ieee80211_chanctx_conf *chanctx_conf;
1863         enum ieee80211_band band;
1864         struct iwl_rate_scale_data *window;
1865         struct rs_rate *rate = &tbl->rate;
1866         enum tpc_action action;
1867         s32 sr;
1868         u8 cur = lq_sta->lq.reduced_tpc;
1869         int current_tpt;
1870         int weak, strong;
1871         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1872
1873 #ifdef CONFIG_MAC80211_DEBUGFS
1874         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1875                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1876                                lq_sta->pers.dbg_fixed_txp_reduction);
1877                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1878                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1879         }
1880 #endif
1881
1882         rcu_read_lock();
1883         chanctx_conf = rcu_dereference(vif->chanctx_conf);
1884         if (WARN_ON(!chanctx_conf))
1885                 band = IEEE80211_NUM_BANDS;
1886         else
1887                 band = chanctx_conf->def.chan->band;
1888         rcu_read_unlock();
1889
1890         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1891                 IWL_DEBUG_RATE(mvm,
1892                                "tpc is not allowed. remove txp restrictions\n");
1893                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1894                 return cur != TPC_NO_REDUCTION;
1895         }
1896
1897         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1898
1899         /* Collect measured throughputs for current and adjacent rates */
1900         window = tbl->tpc_win;
1901         sr = window[cur].success_ratio;
1902         current_tpt = window[cur].average_tpt;
1903         if (weak != TPC_INVALID)
1904                 weak_tpt = window[weak].average_tpt;
1905         if (strong != TPC_INVALID)
1906                 strong_tpt = window[strong].average_tpt;
1907
1908         IWL_DEBUG_RATE(mvm,
1909                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1910                        cur, current_tpt, sr, weak, strong,
1911                        weak_tpt, strong_tpt);
1912
1913         action = rs_get_tpc_action(mvm, sr, weak, strong,
1914                                    current_tpt, weak_tpt, strong_tpt);
1915
1916         /* override actions if we are on the edge */
1917         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
1918                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
1919                 action = TPC_ACTION_STAY;
1920         } else if (strong == TPC_INVALID &&
1921                    (action == TPC_ACTION_INCREASE ||
1922                     action == TPC_ACTION_NO_RESTIRCTION)) {
1923                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
1924                 action = TPC_ACTION_STAY;
1925         }
1926
1927         switch (action) {
1928         case TPC_ACTION_DECREASE:
1929                 lq_sta->lq.reduced_tpc = weak;
1930                 return true;
1931         case TPC_ACTION_INCREASE:
1932                 lq_sta->lq.reduced_tpc = strong;
1933                 return true;
1934         case TPC_ACTION_NO_RESTIRCTION:
1935                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1936                 return true;
1937         case TPC_ACTION_STAY:
1938                 /* do nothing */
1939                 break;
1940         }
1941         return false;
1942 }
1943
1944 /*
1945  * Do rate scaling and search for new modulation mode.
1946  */
1947 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1948                                   struct sk_buff *skb,
1949                                   struct ieee80211_sta *sta,
1950                                   struct iwl_lq_sta *lq_sta)
1951 {
1952         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1953         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1954         int low = IWL_RATE_INVALID;
1955         int high = IWL_RATE_INVALID;
1956         int index;
1957         struct iwl_rate_scale_data *window = NULL;
1958         int current_tpt = IWL_INVALID_VALUE;
1959         int low_tpt = IWL_INVALID_VALUE;
1960         int high_tpt = IWL_INVALID_VALUE;
1961         u32 fail_count;
1962         enum rs_action scale_action = RS_ACTION_STAY;
1963         u16 rate_mask;
1964         u8 update_lq = 0;
1965         struct iwl_scale_tbl_info *tbl, *tbl1;
1966         u8 active_tbl = 0;
1967         u8 done_search = 0;
1968         u16 high_low;
1969         s32 sr;
1970         u8 tid = IWL_MAX_TID_COUNT;
1971         u8 prev_agg = lq_sta->is_agg;
1972         struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
1973         struct iwl_mvm_tid_data *tid_data;
1974         struct rs_rate *rate;
1975
1976         /* Send management frames and NO_ACK data using lowest rate. */
1977         /* TODO: this could probably be improved.. */
1978         if (!ieee80211_is_data(hdr->frame_control) ||
1979             info->flags & IEEE80211_TX_CTL_NO_ACK)
1980                 return;
1981
1982         tid = rs_get_tid(lq_sta, hdr);
1983         if ((tid != IWL_MAX_TID_COUNT) &&
1984             (lq_sta->tx_agg_tid_en & (1 << tid))) {
1985                 tid_data = &sta_priv->tid_data[tid];
1986                 if (tid_data->state == IWL_AGG_OFF)
1987                         lq_sta->is_agg = 0;
1988                 else
1989                         lq_sta->is_agg = 1;
1990         } else {
1991                 lq_sta->is_agg = 0;
1992         }
1993
1994         /*
1995          * Select rate-scale / modulation-mode table to work with in
1996          * the rest of this function:  "search" if searching for better
1997          * modulation mode, or "active" if doing rate scaling within a mode.
1998          */
1999         if (!lq_sta->search_better_tbl)
2000                 active_tbl = lq_sta->active_tbl;
2001         else
2002                 active_tbl = 1 - lq_sta->active_tbl;
2003
2004         tbl = &(lq_sta->lq_info[active_tbl]);
2005         rate = &tbl->rate;
2006
2007         if (prev_agg != lq_sta->is_agg) {
2008                 IWL_DEBUG_RATE(mvm,
2009                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2010                                prev_agg, lq_sta->is_agg);
2011                 rs_set_expected_tpt_table(lq_sta, tbl);
2012                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2013         }
2014
2015         /* current tx rate */
2016         index = lq_sta->last_txrate_idx;
2017
2018         /* rates available for this association, and for modulation mode */
2019         rate_mask = rs_get_supported_rates(lq_sta, rate);
2020
2021         if (!(BIT(index) & rate_mask)) {
2022                 IWL_ERR(mvm, "Current Rate is not valid\n");
2023                 if (lq_sta->search_better_tbl) {
2024                         /* revert to active table if search table is not valid*/
2025                         rate->type = LQ_NONE;
2026                         lq_sta->search_better_tbl = 0;
2027                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2028                         rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2029                 }
2030                 return;
2031         }
2032
2033         /* Get expected throughput table and history window for current rate */
2034         if (!tbl->expected_tpt) {
2035                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2036                 return;
2037         }
2038
2039         /* force user max rate if set by user */
2040         if ((lq_sta->max_rate_idx != -1) &&
2041             (lq_sta->max_rate_idx < index)) {
2042                 index = lq_sta->max_rate_idx;
2043                 update_lq = 1;
2044                 window = &(tbl->win[index]);
2045                 IWL_DEBUG_RATE(mvm,
2046                                "Forcing user max rate %d\n",
2047                                index);
2048                 goto lq_update;
2049         }
2050
2051         window = &(tbl->win[index]);
2052
2053         /*
2054          * If there is not enough history to calculate actual average
2055          * throughput, keep analyzing results of more tx frames, without
2056          * changing rate or mode (bypass most of the rest of this function).
2057          * Set up new rate table in uCode only if old rate is not supported
2058          * in current association (use new rate found above).
2059          */
2060         fail_count = window->counter - window->success_counter;
2061         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2062             (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2063                 IWL_DEBUG_RATE(mvm,
2064                                "(%s: %d): Test Window: succ %d total %d\n",
2065                                rs_pretty_lq_type(rate->type),
2066                                index, window->success_counter, window->counter);
2067
2068                 /* Can't calculate this yet; not enough history */
2069                 window->average_tpt = IWL_INVALID_VALUE;
2070
2071                 /* Should we stay with this modulation mode,
2072                  * or search for a new one? */
2073                 rs_stay_in_table(lq_sta, false);
2074
2075                 goto out;
2076         }
2077         /* Else we have enough samples; calculate estimate of
2078          * actual average throughput */
2079         if (window->average_tpt != ((window->success_ratio *
2080                         tbl->expected_tpt[index] + 64) / 128)) {
2081                 window->average_tpt = ((window->success_ratio *
2082                                         tbl->expected_tpt[index] + 64) / 128);
2083         }
2084
2085         /* If we are searching for better modulation mode, check success. */
2086         if (lq_sta->search_better_tbl) {
2087                 /* If good success, continue using the "search" mode;
2088                  * no need to send new link quality command, since we're
2089                  * continuing to use the setup that we've been trying. */
2090                 if (window->average_tpt > lq_sta->last_tpt) {
2091                         IWL_DEBUG_RATE(mvm,
2092                                        "SWITCHING TO NEW TABLE SR: %d "
2093                                        "cur-tpt %d old-tpt %d\n",
2094                                        window->success_ratio,
2095                                        window->average_tpt,
2096                                        lq_sta->last_tpt);
2097
2098                         /* Swap tables; "search" becomes "active" */
2099                         lq_sta->active_tbl = active_tbl;
2100                         current_tpt = window->average_tpt;
2101                 /* Else poor success; go back to mode in "active" table */
2102                 } else {
2103                         IWL_DEBUG_RATE(mvm,
2104                                        "GOING BACK TO THE OLD TABLE: SR %d "
2105                                        "cur-tpt %d old-tpt %d\n",
2106                                        window->success_ratio,
2107                                        window->average_tpt,
2108                                        lq_sta->last_tpt);
2109
2110                         /* Nullify "search" table */
2111                         rate->type = LQ_NONE;
2112
2113                         /* Revert to "active" table */
2114                         active_tbl = lq_sta->active_tbl;
2115                         tbl = &(lq_sta->lq_info[active_tbl]);
2116
2117                         /* Revert to "active" rate and throughput info */
2118                         index = tbl->rate.index;
2119                         current_tpt = lq_sta->last_tpt;
2120
2121                         /* Need to set up a new rate table in uCode */
2122                         update_lq = 1;
2123                 }
2124
2125                 /* Either way, we've made a decision; modulation mode
2126                  * search is done, allow rate adjustment next time. */
2127                 lq_sta->search_better_tbl = 0;
2128                 done_search = 1;        /* Don't switch modes below! */
2129                 goto lq_update;
2130         }
2131
2132         /* (Else) not in search of better modulation mode, try for better
2133          * starting rate, while staying in this mode. */
2134         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2135         low = high_low & 0xff;
2136         high = (high_low >> 8) & 0xff;
2137
2138         /* If user set max rate, dont allow higher than user constrain */
2139         if ((lq_sta->max_rate_idx != -1) &&
2140             (lq_sta->max_rate_idx < high))
2141                 high = IWL_RATE_INVALID;
2142
2143         sr = window->success_ratio;
2144
2145         /* Collect measured throughputs for current and adjacent rates */
2146         current_tpt = window->average_tpt;
2147         if (low != IWL_RATE_INVALID)
2148                 low_tpt = tbl->win[low].average_tpt;
2149         if (high != IWL_RATE_INVALID)
2150                 high_tpt = tbl->win[high].average_tpt;
2151
2152         IWL_DEBUG_RATE(mvm,
2153                        "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2154                        rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2155                        low, high, low_tpt, high_tpt);
2156
2157         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2158                                           current_tpt, low_tpt, high_tpt);
2159
2160         /* Force a search in case BT doesn't like us being in MIMO */
2161         if (is_mimo(rate) &&
2162             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2163                 IWL_DEBUG_RATE(mvm,
2164                                "BT Coex forbids MIMO. Search for new config\n");
2165                 rs_stay_in_table(lq_sta, true);
2166                 goto lq_update;
2167         }
2168
2169         switch (scale_action) {
2170         case RS_ACTION_DOWNSCALE:
2171                 /* Decrease starting rate, update uCode's rate table */
2172                 if (low != IWL_RATE_INVALID) {
2173                         update_lq = 1;
2174                         index = low;
2175                 } else {
2176                         IWL_DEBUG_RATE(mvm,
2177                                        "At the bottom rate. Can't decrease\n");
2178                 }
2179
2180                 break;
2181         case RS_ACTION_UPSCALE:
2182                 /* Increase starting rate, update uCode's rate table */
2183                 if (high != IWL_RATE_INVALID) {
2184                         update_lq = 1;
2185                         index = high;
2186                 } else {
2187                         IWL_DEBUG_RATE(mvm,
2188                                        "At the top rate. Can't increase\n");
2189                 }
2190
2191                 break;
2192         case RS_ACTION_STAY:
2193                 /* No change */
2194                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2195                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2196                 break;
2197         default:
2198                 break;
2199         }
2200
2201 lq_update:
2202         /* Replace uCode's rate table for the destination station. */
2203         if (update_lq) {
2204                 tbl->rate.index = index;
2205                 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2206         }
2207
2208         rs_stay_in_table(lq_sta, false);
2209
2210         /*
2211          * Search for new modulation mode if we're:
2212          * 1)  Not changing rates right now
2213          * 2)  Not just finishing up a search
2214          * 3)  Allowing a new search
2215          */
2216         if (!update_lq && !done_search &&
2217             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2218             && window->counter) {
2219                 enum rs_column next_column;
2220
2221                 /* Save current throughput to compare with "search" throughput*/
2222                 lq_sta->last_tpt = current_tpt;
2223
2224                 IWL_DEBUG_RATE(mvm,
2225                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2226                                update_lq, done_search, lq_sta->rs_state,
2227                                window->counter);
2228
2229                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2230                 if (next_column != RS_COLUMN_INVALID) {
2231                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2232                                                       next_column);
2233                         if (!ret)
2234                                 lq_sta->search_better_tbl = 1;
2235                 } else {
2236                         IWL_DEBUG_RATE(mvm,
2237                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2238                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2239                 }
2240
2241                 /* If new "search" mode was selected, set up in uCode table */
2242                 if (lq_sta->search_better_tbl) {
2243                         /* Access the "search" table, clear its history. */
2244                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2245                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2246
2247                         /* Use new "search" start rate */
2248                         index = tbl->rate.index;
2249
2250                         rs_dump_rate(mvm, &tbl->rate,
2251                                      "Switch to SEARCH TABLE:");
2252                         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
2253                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2254                 } else {
2255                         done_search = 1;
2256                 }
2257         }
2258
2259         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2260                 /* If the "active" (non-search) mode was legacy,
2261                  * and we've tried switching antennas,
2262                  * but we haven't been able to try HT modes (not available),
2263                  * stay with best antenna legacy modulation for a while
2264                  * before next round of mode comparisons. */
2265                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2266                 if (is_legacy(&tbl1->rate)) {
2267                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2268
2269                         if (tid != IWL_MAX_TID_COUNT) {
2270                                 tid_data = &sta_priv->tid_data[tid];
2271                                 if (tid_data->state != IWL_AGG_OFF) {
2272                                         IWL_DEBUG_RATE(mvm,
2273                                                        "Stop aggregation on tid %d\n",
2274                                                        tid);
2275                                         ieee80211_stop_tx_ba_session(sta, tid);
2276                                 }
2277                         }
2278                         rs_set_stay_in_table(mvm, 1, lq_sta);
2279                 } else {
2280                 /* If we're in an HT mode, and all 3 mode switch actions
2281                  * have been tried and compared, stay in this best modulation
2282                  * mode for a while before next round of mode comparisons. */
2283                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2284                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2285                             (tid != IWL_MAX_TID_COUNT)) {
2286                                 tid_data = &sta_priv->tid_data[tid];
2287                                 if (tid_data->state == IWL_AGG_OFF) {
2288                                         IWL_DEBUG_RATE(mvm,
2289                                                        "try to aggregate tid %d\n",
2290                                                        tid);
2291                                         rs_tl_turn_on_agg(mvm, tid,
2292                                                           lq_sta, sta);
2293                                 }
2294                         }
2295                         rs_set_stay_in_table(mvm, 0, lq_sta);
2296                 }
2297         }
2298
2299 out:
2300         lq_sta->last_txrate_idx = index;
2301 }
2302
2303 /**
2304  * rs_initialize_lq - Initialize a station's hardware rate table
2305  *
2306  * The uCode's station table contains a table of fallback rates
2307  * for automatic fallback during transmission.
2308  *
2309  * NOTE: This sets up a default set of values.  These will be replaced later
2310  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2311  *       rc80211_simple.
2312  *
2313  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2314  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2315  *       which requires station table entry to exist).
2316  */
2317 static void rs_initialize_lq(struct iwl_mvm *mvm,
2318                              struct ieee80211_sta *sta,
2319                              struct iwl_lq_sta *lq_sta,
2320                              enum ieee80211_band band,
2321                              bool init)
2322 {
2323         struct iwl_scale_tbl_info *tbl;
2324         struct rs_rate *rate;
2325         int i;
2326         u8 active_tbl = 0;
2327         u8 valid_tx_ant;
2328
2329         if (!sta || !lq_sta)
2330                 return;
2331
2332         i = lq_sta->last_txrate_idx;
2333
2334         valid_tx_ant = mvm->fw->valid_tx_ant;
2335
2336         if (!lq_sta->search_better_tbl)
2337                 active_tbl = lq_sta->active_tbl;
2338         else
2339                 active_tbl = 1 - lq_sta->active_tbl;
2340
2341         tbl = &(lq_sta->lq_info[active_tbl]);
2342         rate = &tbl->rate;
2343
2344         if ((i < 0) || (i >= IWL_RATE_COUNT))
2345                 i = 0;
2346
2347         rate->index = i;
2348         rate->ant = first_antenna(valid_tx_ant);
2349         rate->sgi = false;
2350         rate->ldpc = false;
2351         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2352         if (band == IEEE80211_BAND_5GHZ)
2353                 rate->type = LQ_LEGACY_A;
2354         else
2355                 rate->type = LQ_LEGACY_G;
2356
2357         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2358         if (rate->ant == ANT_A)
2359                 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2360         else
2361                 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2362
2363         rs_set_expected_tpt_table(lq_sta, tbl);
2364         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2365         /* TODO restore station should remember the lq cmd */
2366         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2367 }
2368
2369 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2370                         struct ieee80211_tx_rate_control *txrc)
2371 {
2372         struct sk_buff *skb = txrc->skb;
2373         struct ieee80211_supported_band *sband = txrc->sband;
2374         struct iwl_op_mode *op_mode __maybe_unused =
2375                         (struct iwl_op_mode *)mvm_r;
2376         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2377         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2378         struct iwl_lq_sta *lq_sta = mvm_sta;
2379
2380         /* Get max rate if user set max rate */
2381         if (lq_sta) {
2382                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2383                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2384                     (lq_sta->max_rate_idx != -1))
2385                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2386                 if ((lq_sta->max_rate_idx < 0) ||
2387                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2388                         lq_sta->max_rate_idx = -1;
2389         }
2390
2391         /* Treat uninitialized rate scaling data same as non-existing. */
2392         if (lq_sta && !lq_sta->pers.drv) {
2393                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2394                 mvm_sta = NULL;
2395         }
2396
2397         /* Send management frames and NO_ACK data using lowest rate. */
2398         if (rate_control_send_low(sta, mvm_sta, txrc))
2399                 return;
2400
2401         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2402                                   info->band, &info->control.rates[0]);
2403
2404         info->control.rates[0].count = 1;
2405 }
2406
2407 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2408                           gfp_t gfp)
2409 {
2410         struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2411         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2412         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2413         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2414
2415         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2416
2417         lq_sta->pers.drv = mvm;
2418 #ifdef CONFIG_MAC80211_DEBUGFS
2419         lq_sta->pers.dbg_fixed_rate = 0;
2420         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2421 #endif
2422
2423         return &sta_priv->lq_sta;
2424 }
2425
2426 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2427                                        int nss)
2428 {
2429         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2430                 (0x3 << (2 * (nss - 1)));
2431         rx_mcs >>= (2 * (nss - 1));
2432
2433         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2434                 return IWL_RATE_MCS_7_INDEX;
2435         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2436                 return IWL_RATE_MCS_8_INDEX;
2437         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2438                 return IWL_RATE_MCS_9_INDEX;
2439
2440         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2441         return -1;
2442 }
2443
2444 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2445                                      struct ieee80211_sta_vht_cap *vht_cap,
2446                                      struct iwl_lq_sta *lq_sta)
2447 {
2448         int i;
2449         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2450
2451         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2452                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2453                         if (i == IWL_RATE_9M_INDEX)
2454                                 continue;
2455
2456                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2457                         if (i == IWL_RATE_MCS_9_INDEX &&
2458                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2459                                 continue;
2460
2461                         lq_sta->active_siso_rate |= BIT(i);
2462                 }
2463         }
2464
2465         if (sta->rx_nss < 2)
2466                 return;
2467
2468         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2469         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2470                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2471                         if (i == IWL_RATE_9M_INDEX)
2472                                 continue;
2473
2474                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2475                         if (i == IWL_RATE_MCS_9_INDEX &&
2476                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2477                                 continue;
2478
2479                         lq_sta->active_mimo2_rate |= BIT(i);
2480                 }
2481         }
2482 }
2483
2484 #ifdef CONFIG_IWLWIFI_DEBUGFS
2485 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm,
2486                                       struct iwl_mvm_frame_stats *stats)
2487 {
2488         spin_lock_bh(&mvm->drv_stats_lock);
2489         memset(stats, 0, sizeof(*stats));
2490         spin_unlock_bh(&mvm->drv_stats_lock);
2491 }
2492
2493 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm,
2494                                 struct iwl_mvm_frame_stats *stats,
2495                                 u32 rate, bool agg)
2496 {
2497         u8 nss = 0, mcs = 0;
2498
2499         spin_lock(&mvm->drv_stats_lock);
2500
2501         if (agg)
2502                 stats->agg_frames++;
2503
2504         stats->success_frames++;
2505
2506         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2507         case RATE_MCS_CHAN_WIDTH_20:
2508                 stats->bw_20_frames++;
2509                 break;
2510         case RATE_MCS_CHAN_WIDTH_40:
2511                 stats->bw_40_frames++;
2512                 break;
2513         case RATE_MCS_CHAN_WIDTH_80:
2514                 stats->bw_80_frames++;
2515                 break;
2516         default:
2517                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2518         }
2519
2520         if (rate & RATE_MCS_HT_MSK) {
2521                 stats->ht_frames++;
2522                 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2523                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2524         } else if (rate & RATE_MCS_VHT_MSK) {
2525                 stats->vht_frames++;
2526                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2527                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2528                        RATE_VHT_MCS_NSS_POS) + 1;
2529         } else {
2530                 stats->legacy_frames++;
2531         }
2532
2533         if (nss == 1)
2534                 stats->siso_frames++;
2535         else if (nss == 2)
2536                 stats->mimo2_frames++;
2537
2538         if (rate & RATE_MCS_SGI_MSK)
2539                 stats->sgi_frames++;
2540         else
2541                 stats->ngi_frames++;
2542
2543         stats->last_rates[stats->last_frame_idx] = rate;
2544         stats->last_frame_idx = (stats->last_frame_idx + 1) %
2545                 ARRAY_SIZE(stats->last_rates);
2546
2547         spin_unlock(&mvm->drv_stats_lock);
2548 }
2549 #endif
2550
2551 /*
2552  * Called after adding a new station to initialize rate scaling
2553  */
2554 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2555                           enum ieee80211_band band, bool init)
2556 {
2557         int i, j;
2558         struct ieee80211_hw *hw = mvm->hw;
2559         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2560         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2561         struct iwl_mvm_sta *sta_priv;
2562         struct iwl_lq_sta *lq_sta;
2563         struct ieee80211_supported_band *sband;
2564         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2565
2566         sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2567         lq_sta = &sta_priv->lq_sta;
2568
2569         /* clear all non-persistent lq data */
2570         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2571
2572         sband = hw->wiphy->bands[band];
2573
2574         lq_sta->lq.sta_id = sta_priv->sta_id;
2575
2576         for (j = 0; j < LQ_SIZE; j++)
2577                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2578
2579         lq_sta->flush_timer = 0;
2580         lq_sta->last_tx = jiffies;
2581
2582         IWL_DEBUG_RATE(mvm,
2583                        "LQ: *** rate scale station global init for station %d ***\n",
2584                        sta_priv->sta_id);
2585         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2586          * the lowest or the highest rate.. Could consider using RSSI from
2587          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2588          * after assoc.. */
2589
2590         lq_sta->max_rate_idx = -1;
2591         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2592         lq_sta->band = sband->band;
2593         /*
2594          * active legacy rates as per supported rates bitmap
2595          */
2596         supp = sta->supp_rates[sband->band];
2597         lq_sta->active_legacy_rate = 0;
2598         for_each_set_bit(i, &supp, BITS_PER_LONG)
2599                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2600
2601         /* TODO: should probably account for rx_highest for both HT/VHT */
2602         if (!vht_cap || !vht_cap->vht_supported) {
2603                 /* active_siso_rate mask includes 9 MBits (bit 5),
2604                  * and CCK (bits 0-3), supp_rates[] does not;
2605                  * shift to convert format, force 9 MBits off.
2606                  */
2607                 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2608                 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2609                 lq_sta->active_siso_rate &= ~((u16)0x2);
2610                 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2611
2612                 /* Same here */
2613                 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2614                 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2615                 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2616                 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2617
2618                 lq_sta->is_vht = false;
2619                 if (mvm->cfg->ht_params->ldpc &&
2620                     (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2621                         lq_sta->ldpc = true;
2622         } else {
2623                 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2624                 lq_sta->is_vht = true;
2625
2626                 if (mvm->cfg->ht_params->ldpc &&
2627                     (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2628                         lq_sta->ldpc = true;
2629         }
2630
2631         lq_sta->max_legacy_rate_idx = find_last_bit(&lq_sta->active_legacy_rate,
2632                                                     BITS_PER_LONG);
2633         lq_sta->max_siso_rate_idx = find_last_bit(&lq_sta->active_siso_rate,
2634                                                   BITS_PER_LONG);
2635         lq_sta->max_mimo2_rate_idx = find_last_bit(&lq_sta->active_mimo2_rate,
2636                                                    BITS_PER_LONG);
2637
2638         IWL_DEBUG_RATE(mvm,
2639                        "RATE MASK: LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d\n",
2640                        lq_sta->active_legacy_rate,
2641                        lq_sta->active_siso_rate,
2642                        lq_sta->active_mimo2_rate,
2643                        lq_sta->is_vht, lq_sta->ldpc);
2644         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2645                        lq_sta->max_legacy_rate_idx,
2646                        lq_sta->max_siso_rate_idx,
2647                        lq_sta->max_mimo2_rate_idx);
2648
2649         /* These values will be overridden later */
2650         lq_sta->lq.single_stream_ant_msk =
2651                 first_antenna(mvm->fw->valid_tx_ant);
2652         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2653
2654         /* as default allow aggregation for all tids */
2655         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2656
2657         /* Set last_txrate_idx to lowest rate */
2658         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2659         if (sband->band == IEEE80211_BAND_5GHZ)
2660                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2661         lq_sta->is_agg = 0;
2662 #ifdef CONFIG_IWLWIFI_DEBUGFS
2663         iwl_mvm_reset_frame_stats(mvm, &mvm->drv_rx_stats);
2664 #endif
2665         rs_initialize_lq(mvm, sta, lq_sta, band, init);
2666 }
2667
2668 static void rs_rate_update(void *mvm_r,
2669                            struct ieee80211_supported_band *sband,
2670                            struct cfg80211_chan_def *chandef,
2671                            struct ieee80211_sta *sta, void *priv_sta,
2672                            u32 changed)
2673 {
2674         u8 tid;
2675         struct iwl_op_mode *op_mode  =
2676                         (struct iwl_op_mode *)mvm_r;
2677         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2678
2679         /* Stop any ongoing aggregations as rs starts off assuming no agg */
2680         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2681                 ieee80211_stop_tx_ba_session(sta, tid);
2682
2683         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2684 }
2685
2686 #ifdef CONFIG_MAC80211_DEBUGFS
2687 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2688                                             struct iwl_lq_cmd *lq_cmd,
2689                                             enum ieee80211_band band,
2690                                             u32 ucode_rate)
2691 {
2692         struct rs_rate rate;
2693         int i;
2694         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2695         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2696         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2697
2698         for (i = 0; i < num_rates; i++)
2699                 lq_cmd->rs_table[i] = ucode_rate_le32;
2700
2701         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2702
2703         if (is_mimo(&rate))
2704                 lq_cmd->mimo_delim = num_rates - 1;
2705         else
2706                 lq_cmd->mimo_delim = 0;
2707
2708         lq_cmd->reduced_tpc = 0;
2709
2710         if (num_of_ant(ant) == 1)
2711                 lq_cmd->single_stream_ant_msk = ant;
2712
2713         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2714 }
2715 #endif /* CONFIG_MAC80211_DEBUGFS */
2716
2717 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2718                                      struct iwl_lq_sta *lq_sta,
2719                                      struct rs_rate *rate,
2720                                      __le32 *rs_table, int *rs_table_index,
2721                                      int num_rates, int num_retries,
2722                                      u8 valid_tx_ant, bool toggle_ant)
2723 {
2724         int i, j;
2725         __le32 ucode_rate;
2726         bool bottom_reached = false;
2727         int prev_rate_idx = rate->index;
2728         int end = LINK_QUAL_MAX_RETRY_NUM;
2729         int index = *rs_table_index;
2730
2731         for (i = 0; i < num_rates && index < end; i++) {
2732                 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, rate));
2733                 for (j = 0; j < num_retries && index < end; j++, index++)
2734                         rs_table[index] = ucode_rate;
2735
2736                 if (toggle_ant)
2737                         rs_toggle_antenna(valid_tx_ant, rate);
2738
2739                 prev_rate_idx = rate->index;
2740                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2741                 if (bottom_reached && !is_legacy(rate))
2742                         break;
2743         }
2744
2745         if (!bottom_reached)
2746                 rate->index = prev_rate_idx;
2747
2748         *rs_table_index = index;
2749 }
2750
2751 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2752  * column the rate table should look like this:
2753  *
2754  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2755  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2756  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2757  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2758  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2759  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2760  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2761  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2762  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2763  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2764  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2765  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2766  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2767  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2768  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2769  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2770  */
2771 static void rs_build_rates_table(struct iwl_mvm *mvm,
2772                                  struct iwl_lq_sta *lq_sta,
2773                                  const struct rs_rate *initial_rate)
2774 {
2775         struct rs_rate rate;
2776         int num_rates, num_retries, index = 0;
2777         u8 valid_tx_ant = 0;
2778         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2779         bool toggle_ant = false;
2780
2781         memcpy(&rate, initial_rate, sizeof(rate));
2782
2783         valid_tx_ant = mvm->fw->valid_tx_ant;
2784
2785         if (is_siso(&rate)) {
2786                 num_rates = RS_INITIAL_SISO_NUM_RATES;
2787                 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
2788         } else if (is_mimo(&rate)) {
2789                 num_rates = RS_INITIAL_MIMO_NUM_RATES;
2790                 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
2791         } else {
2792                 num_rates = RS_INITIAL_LEGACY_NUM_RATES;
2793                 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2794                 toggle_ant = true;
2795         }
2796
2797         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2798                                  num_rates, num_retries, valid_tx_ant,
2799                                  toggle_ant);
2800
2801         rs_get_lower_rate_down_column(lq_sta, &rate);
2802
2803         if (is_siso(&rate)) {
2804                 num_rates = RS_SECONDARY_SISO_NUM_RATES;
2805                 num_retries = RS_SECONDARY_SISO_RETRIES;
2806                 lq_cmd->mimo_delim = index;
2807         } else if (is_legacy(&rate)) {
2808                 num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2809                 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2810         } else {
2811                 WARN_ON_ONCE(1);
2812         }
2813
2814         toggle_ant = true;
2815
2816         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2817                                  num_rates, num_retries, valid_tx_ant,
2818                                  toggle_ant);
2819
2820         rs_get_lower_rate_down_column(lq_sta, &rate);
2821
2822         num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2823         num_retries = RS_LEGACY_RETRIES_PER_RATE;
2824
2825         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2826                                  num_rates, num_retries, valid_tx_ant,
2827                                  toggle_ant);
2828
2829 }
2830
2831 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
2832                            struct ieee80211_sta *sta,
2833                            struct iwl_lq_sta *lq_sta,
2834                            const struct rs_rate *initial_rate)
2835 {
2836         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2837         struct iwl_mvm_sta *mvmsta;
2838         struct iwl_mvm_vif *mvmvif;
2839
2840         lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2841         lq_cmd->agg_time_limit =
2842                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2843
2844 #ifdef CONFIG_MAC80211_DEBUGFS
2845         if (lq_sta->pers.dbg_fixed_rate) {
2846                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
2847                                                 lq_sta->band,
2848                                                 lq_sta->pers.dbg_fixed_rate);
2849                 return;
2850         }
2851 #endif
2852         if (WARN_ON_ONCE(!sta || !initial_rate))
2853                 return;
2854
2855         rs_build_rates_table(mvm, lq_sta, initial_rate);
2856
2857         if (num_of_ant(initial_rate->ant) == 1)
2858                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
2859
2860         mvmsta = iwl_mvm_sta_from_mac80211(sta);
2861         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
2862
2863         if (num_of_ant(initial_rate->ant) == 1)
2864                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
2865
2866         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
2867
2868         /*
2869          * In case of low latency, tell the firwmare to leave a frame in the
2870          * Tx Fifo so that it can start a transaction in the same TxOP. This
2871          * basically allows the firmware to send bursts.
2872          */
2873         if (iwl_mvm_vif_low_latency(mvmvif)) {
2874                 lq_cmd->agg_frame_cnt_limit--;
2875
2876                 if (mvm->low_latency_agg_frame_limit)
2877                         lq_cmd->agg_frame_cnt_limit =
2878                                 min(lq_cmd->agg_frame_cnt_limit,
2879                                     mvm->low_latency_agg_frame_limit);
2880         }
2881
2882         if (mvmsta->vif->p2p)
2883                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
2884
2885         lq_cmd->agg_time_limit =
2886                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
2887 }
2888
2889 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2890 {
2891         return hw->priv;
2892 }
2893 /* rate scale requires free function to be implemented */
2894 static void rs_free(void *mvm_rate)
2895 {
2896         return;
2897 }
2898
2899 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2900                         void *mvm_sta)
2901 {
2902         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2903         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2904
2905         IWL_DEBUG_RATE(mvm, "enter\n");
2906         IWL_DEBUG_RATE(mvm, "leave\n");
2907 }
2908
2909 #ifdef CONFIG_MAC80211_DEBUGFS
2910 int rs_pretty_print_rate(char *buf, const u32 rate)
2911 {
2912
2913         char *type, *bw;
2914         u8 mcs = 0, nss = 0;
2915         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2916
2917         if (!(rate & RATE_MCS_HT_MSK) &&
2918             !(rate & RATE_MCS_VHT_MSK)) {
2919                 int index = iwl_hwrate_to_plcp_idx(rate);
2920
2921                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
2922                                rs_pretty_ant(ant),
2923                                index == IWL_RATE_INVALID ? "BAD" :
2924                                iwl_rate_mcs[index].mbps);
2925         }
2926
2927         if (rate & RATE_MCS_VHT_MSK) {
2928                 type = "VHT";
2929                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2930                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
2931                        >> RATE_VHT_MCS_NSS_POS) + 1;
2932         } else if (rate & RATE_MCS_HT_MSK) {
2933                 type = "HT";
2934                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
2935         } else {
2936                 type = "Unknown"; /* shouldn't happen */
2937         }
2938
2939         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2940         case RATE_MCS_CHAN_WIDTH_20:
2941                 bw = "20Mhz";
2942                 break;
2943         case RATE_MCS_CHAN_WIDTH_40:
2944                 bw = "40Mhz";
2945                 break;
2946         case RATE_MCS_CHAN_WIDTH_80:
2947                 bw = "80Mhz";
2948                 break;
2949         case RATE_MCS_CHAN_WIDTH_160:
2950                 bw = "160Mhz";
2951                 break;
2952         default:
2953                 bw = "BAD BW";
2954         }
2955
2956         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
2957                        type, rs_pretty_ant(ant), bw, mcs, nss,
2958                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
2959                        (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
2960                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
2961                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
2962                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
2963 }
2964
2965 /**
2966  * Program the device to use fixed rate for frame transmit
2967  * This is for debugging/testing only
2968  * once the device start use fixed rate, we need to reload the module
2969  * to being back the normal operation.
2970  */
2971 static void rs_program_fix_rate(struct iwl_mvm *mvm,
2972                                 struct iwl_lq_sta *lq_sta)
2973 {
2974         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2975         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2976         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2977
2978         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
2979                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
2980
2981         if (lq_sta->pers.dbg_fixed_rate) {
2982                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
2983                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
2984         }
2985 }
2986
2987 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2988                         const char __user *user_buf, size_t count, loff_t *ppos)
2989 {
2990         struct iwl_lq_sta *lq_sta = file->private_data;
2991         struct iwl_mvm *mvm;
2992         char buf[64];
2993         size_t buf_size;
2994         u32 parsed_rate;
2995
2996         mvm = lq_sta->pers.drv;
2997         memset(buf, 0, sizeof(buf));
2998         buf_size = min(count, sizeof(buf) -  1);
2999         if (copy_from_user(buf, user_buf, buf_size))
3000                 return -EFAULT;
3001
3002         if (sscanf(buf, "%x", &parsed_rate) == 1)
3003                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3004         else
3005                 lq_sta->pers.dbg_fixed_rate = 0;
3006
3007         rs_program_fix_rate(mvm, lq_sta);
3008
3009         return count;
3010 }
3011
3012 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3013                         char __user *user_buf, size_t count, loff_t *ppos)
3014 {
3015         char *buff;
3016         int desc = 0;
3017         int i = 0;
3018         ssize_t ret;
3019
3020         struct iwl_lq_sta *lq_sta = file->private_data;
3021         struct iwl_mvm *mvm;
3022         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3023         struct rs_rate *rate = &tbl->rate;
3024         mvm = lq_sta->pers.drv;
3025         buff = kmalloc(2048, GFP_KERNEL);
3026         if (!buff)
3027                 return -ENOMEM;
3028
3029         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3030         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3031                         lq_sta->total_failed, lq_sta->total_success,
3032                         lq_sta->active_legacy_rate);
3033         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3034                         lq_sta->pers.dbg_fixed_rate);
3035         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3036             (mvm->fw->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3037             (mvm->fw->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3038             (mvm->fw->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3039         desc += sprintf(buff+desc, "lq type %s\n",
3040                         (is_legacy(rate)) ? "legacy" :
3041                         is_vht(rate) ? "VHT" : "HT");
3042         if (!is_legacy(rate)) {
3043                 desc += sprintf(buff+desc, " %s",
3044                    (is_siso(rate)) ? "SISO" : "MIMO2");
3045                    desc += sprintf(buff+desc, " %s",
3046                                    (is_ht20(rate)) ? "20MHz" :
3047                                    (is_ht40(rate)) ? "40MHz" :
3048                                    (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3049                    desc += sprintf(buff+desc, " %s %s %s\n",
3050                                    (rate->sgi) ? "SGI" : "NGI",
3051                                    (rate->ldpc) ? "LDPC" : "BCC",
3052                                    (lq_sta->is_agg) ? "AGG on" : "");
3053         }
3054         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3055                         lq_sta->last_rate_n_flags);
3056         desc += sprintf(buff+desc,
3057                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3058                         lq_sta->lq.flags,
3059                         lq_sta->lq.mimo_delim,
3060                         lq_sta->lq.single_stream_ant_msk,
3061                         lq_sta->lq.dual_stream_ant_msk);
3062
3063         desc += sprintf(buff+desc,
3064                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3065                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3066                         lq_sta->lq.agg_disable_start_th,
3067                         lq_sta->lq.agg_frame_cnt_limit);
3068
3069         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3070         desc += sprintf(buff+desc,
3071                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3072                         lq_sta->lq.initial_rate_index[0],
3073                         lq_sta->lq.initial_rate_index[1],
3074                         lq_sta->lq.initial_rate_index[2],
3075                         lq_sta->lq.initial_rate_index[3]);
3076
3077         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3078                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3079
3080                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3081                 desc += rs_pretty_print_rate(buff+desc, r);
3082         }
3083
3084         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3085         kfree(buff);
3086         return ret;
3087 }
3088
3089 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3090         .write = rs_sta_dbgfs_scale_table_write,
3091         .read = rs_sta_dbgfs_scale_table_read,
3092         .open = simple_open,
3093         .llseek = default_llseek,
3094 };
3095 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3096                         char __user *user_buf, size_t count, loff_t *ppos)
3097 {
3098         char *buff;
3099         int desc = 0;
3100         int i, j;
3101         ssize_t ret;
3102         struct iwl_scale_tbl_info *tbl;
3103         struct rs_rate *rate;
3104         struct iwl_lq_sta *lq_sta = file->private_data;
3105
3106         buff = kmalloc(1024, GFP_KERNEL);
3107         if (!buff)
3108                 return -ENOMEM;
3109
3110         for (i = 0; i < LQ_SIZE; i++) {
3111                 tbl = &(lq_sta->lq_info[i]);
3112                 rate = &tbl->rate;
3113                 desc += sprintf(buff+desc,
3114                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3115                                 "index=%d\n",
3116                                 lq_sta->active_tbl == i ? "*" : "x",
3117                                 rate->type,
3118                                 rate->sgi,
3119                                 is_ht20(rate) ? "20Mhz" :
3120                                 is_ht40(rate) ? "40Mhz" :
3121                                 is_ht80(rate) ? "80Mhz" : "ERR",
3122                                 rate->index);
3123                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3124                         desc += sprintf(buff+desc,
3125                                 "counter=%d success=%d %%=%d\n",
3126                                 tbl->win[j].counter,
3127                                 tbl->win[j].success_counter,
3128                                 tbl->win[j].success_ratio);
3129                 }
3130         }
3131         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3132         kfree(buff);
3133         return ret;
3134 }
3135
3136 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3137         .read = rs_sta_dbgfs_stats_table_read,
3138         .open = simple_open,
3139         .llseek = default_llseek,
3140 };
3141
3142 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3143                                               char __user *user_buf,
3144                                               size_t count, loff_t *ppos)
3145 {
3146         static const char * const column_name[] = {
3147                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3148                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3149                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3150                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3151                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3152                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3153                 [RS_COLUMN_MIMO2] = "MIMO2",
3154                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3155         };
3156
3157         static const char * const rate_name[] = {
3158                 [IWL_RATE_1M_INDEX] = "1M",
3159                 [IWL_RATE_2M_INDEX] = "2M",
3160                 [IWL_RATE_5M_INDEX] = "5.5M",
3161                 [IWL_RATE_11M_INDEX] = "11M",
3162                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3163                 [IWL_RATE_9M_INDEX] = "9M",
3164                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3165                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3166                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3167                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3168                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3169                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3170                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3171                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3172                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3173         };
3174
3175         char *buff, *pos, *endpos;
3176         int col, rate;
3177         ssize_t ret;
3178         struct iwl_lq_sta *lq_sta = file->private_data;
3179         struct rs_rate_stats *stats;
3180         static const size_t bufsz = 1024;
3181
3182         buff = kmalloc(bufsz, GFP_KERNEL);
3183         if (!buff)
3184                 return -ENOMEM;
3185
3186         pos = buff;
3187         endpos = pos + bufsz;
3188
3189         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3190         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3191                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3192         pos += scnprintf(pos, endpos - pos, "\n");
3193
3194         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3195                 pos += scnprintf(pos, endpos - pos,
3196                                  "%s,", column_name[col]);
3197
3198                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3199                         stats = &(lq_sta->tx_stats[col][rate]);
3200                         pos += scnprintf(pos, endpos - pos,
3201                                          "%llu/%llu,",
3202                                          stats->success,
3203                                          stats->total);
3204                 }
3205                 pos += scnprintf(pos, endpos - pos, "\n");
3206         }
3207
3208         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3209         kfree(buff);
3210         return ret;
3211 }
3212
3213 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3214                                                const char __user *user_buf,
3215                                                size_t count, loff_t *ppos)
3216 {
3217         struct iwl_lq_sta *lq_sta = file->private_data;
3218         memset(lq_sta->tx_stats, 0, sizeof(lq_sta->tx_stats));
3219
3220         return count;
3221 }
3222
3223 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3224         .read = rs_sta_dbgfs_drv_tx_stats_read,
3225         .write = rs_sta_dbgfs_drv_tx_stats_write,
3226         .open = simple_open,
3227         .llseek = default_llseek,
3228 };
3229
3230 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3231 {
3232         struct iwl_lq_sta *lq_sta = mvm_sta;
3233         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3234                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
3235         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3236                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
3237         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3238                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3239         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3240                           &lq_sta->tx_agg_tid_en);
3241         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3242                           &lq_sta->pers.dbg_fixed_txp_reduction);
3243 }
3244
3245 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3246 {
3247 }
3248 #endif
3249
3250 /*
3251  * Initialization of rate scaling information is done by driver after
3252  * the station is added. Since mac80211 calls this function before a
3253  * station is added we ignore it.
3254  */
3255 static void rs_rate_init_stub(void *mvm_r,
3256                               struct ieee80211_supported_band *sband,
3257                               struct cfg80211_chan_def *chandef,
3258                               struct ieee80211_sta *sta, void *mvm_sta)
3259 {
3260 }
3261
3262 static const struct rate_control_ops rs_mvm_ops = {
3263         .name = RS_NAME,
3264         .tx_status = rs_tx_status,
3265         .get_rate = rs_get_rate,
3266         .rate_init = rs_rate_init_stub,
3267         .alloc = rs_alloc,
3268         .free = rs_free,
3269         .alloc_sta = rs_alloc_sta,
3270         .free_sta = rs_free_sta,
3271         .rate_update = rs_rate_update,
3272 #ifdef CONFIG_MAC80211_DEBUGFS
3273         .add_sta_debugfs = rs_add_debugfs,
3274         .remove_sta_debugfs = rs_remove_debugfs,
3275 #endif
3276 };
3277
3278 int iwl_mvm_rate_control_register(void)
3279 {
3280         return ieee80211_rate_control_register(&rs_mvm_ops);
3281 }
3282
3283 void iwl_mvm_rate_control_unregister(void)
3284 {
3285         ieee80211_rate_control_unregister(&rs_mvm_ops);
3286 }
3287
3288 /**
3289  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3290  * Tx protection, according to this rquest and previous requests,
3291  * and send the LQ command.
3292  * @mvmsta: The station
3293  * @enable: Enable Tx protection?
3294  */
3295 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3296                           bool enable)
3297 {
3298         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3299
3300         lockdep_assert_held(&mvm->mutex);
3301
3302         if (enable) {
3303                 if (mvmsta->tx_protection == 0)
3304                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
3305                 mvmsta->tx_protection++;
3306         } else {
3307                 mvmsta->tx_protection--;
3308                 if (mvmsta->tx_protection == 0)
3309                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3310         }
3311
3312         return iwl_mvm_send_lq_cmd(mvm, lq, false);
3313 }