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

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