iwlwifi/mvm/rs.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /******************************************************************************
0003  *
0004  * Copyright(c) 2005 - 2014, 2018 - 2021 Intel Corporation. All rights reserved.
0005  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
0006  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
0007  *****************************************************************************/
0008 #include <linux/kernel.h>
0009 #include <linux/skbuff.h>
0010 #include <linux/slab.h>
0011 #include <net/mac80211.h>
0012
0013 #include <linux/netdevice.h>
0014 #include <linux/etherdevice.h>
0015 #include <linux/delay.h>
0016
0017 #include <linux/workqueue.h>
0018 #include "rs.h"
0019 #include "fw-api.h"
0020 #include "sta.h"
0021 #include "iwl-op-mode.h"
0022 #include "mvm.h"
0023 #include "debugfs.h"
0024
0025 #define IWL_RATE_MAX_WINDOW     62  /* # tx in history window */
0026
0027 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
0028  * Use this macro when dealing with thresholds consts set as a percentage
0029  */
0030 #define RS_PERCENT(x) (128 * x)
0031
0032 static u8 rs_ht_to_legacy[] = {
0033     [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
0034     [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
0035     [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
0036     [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
0037     [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
0038     [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
0039     [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
0040     [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
0041     [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
0042     [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
0043 };
0044
0045 static const u8 ant_toggle_lookup[] = {
0046     [ANT_NONE] = ANT_NONE,
0047     [ANT_A] = ANT_B,
0048     [ANT_B] = ANT_A,
0049     [ANT_AB] = ANT_AB,
0050 };
0051
0052 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)               \
0053     [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,         \
0054                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
0055                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
0056                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
0057                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
0058                     IWL_RATE_##rp##M_INDEX,       \
0059                     IWL_RATE_##rn##M_INDEX }
0060
0061 #define IWL_DECLARE_MCS_RATE(s)                       \
0062     [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,        \
0063                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
0064                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
0065                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
0066                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
0067                        IWL_RATE_INVM_INDEX,           \
0068                        IWL_RATE_INVM_INDEX }
0069
0070 /*
0071  * Parameter order:
0072  *   rate, ht rate, prev rate, next rate
0073  *
0074  * If there isn't a valid next or previous rate then INV is used which
0075  * maps to IWL_RATE_INVALID
0076  *
0077  */
0078 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
0079     IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
0080     IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
0081     IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
0082     IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
0083     IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
0084     IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
0085     IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
0086     IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
0087     IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
0088     IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
0089     IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
0090     IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
0091     IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
0092     IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
0093     IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
0094 };
0095
0096 enum rs_action {
0097     RS_ACTION_STAY = 0,
0098     RS_ACTION_DOWNSCALE = -1,
0099     RS_ACTION_UPSCALE = 1,
0100 };
0101
0102 enum rs_column_mode {
0103     RS_INVALID = 0,
0104     RS_LEGACY,
0105     RS_SISO,
0106     RS_MIMO2,
0107 };
0108
0109 #define MAX_NEXT_COLUMNS 7
0110 #define MAX_COLUMN_CHECKS 3
0111
0112 struct rs_tx_column;
0113
0114 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
0115                      struct ieee80211_sta *sta,
0116                      struct rs_rate *rate,
0117                      const struct rs_tx_column *next_col);
0118
0119 struct rs_tx_column {
0120     enum rs_column_mode mode;
0121     u8 ant;
0122     bool sgi;
0123     enum rs_column next_columns[MAX_NEXT_COLUMNS];
0124     allow_column_func_t checks[MAX_COLUMN_CHECKS];
0125 };
0126
0127 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
0128              struct rs_rate *rate,
0129              const struct rs_tx_column *next_col)
0130 {
0131     return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
0132 }
0133
0134 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
0135               struct rs_rate *rate,
0136               const struct rs_tx_column *next_col)
0137 {
0138     if (!sta->deflink.ht_cap.ht_supported)
0139         return false;
0140
0141     if (sta->smps_mode == IEEE80211_SMPS_STATIC)
0142         return false;
0143
0144     if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
0145         return false;
0146
0147     if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
0148         return false;
0149
0150     if (mvm->nvm_data->sku_cap_mimo_disabled)
0151         return false;
0152
0153     return true;
0154 }
0155
0156 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
0157               struct rs_rate *rate,
0158               const struct rs_tx_column *next_col)
0159 {
0160     if (!sta->deflink.ht_cap.ht_supported)
0161         return false;
0162
0163     return true;
0164 }
0165
0166 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
0167              struct rs_rate *rate,
0168              const struct rs_tx_column *next_col)
0169 {
0170     struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
0171     struct ieee80211_sta_vht_cap *vht_cap = &sta->deflink.vht_cap;
0172
0173     if (is_ht20(rate) && (ht_cap->cap &
0174                  IEEE80211_HT_CAP_SGI_20))
0175         return true;
0176     if (is_ht40(rate) && (ht_cap->cap &
0177                  IEEE80211_HT_CAP_SGI_40))
0178         return true;
0179     if (is_ht80(rate) && (vht_cap->cap &
0180                  IEEE80211_VHT_CAP_SHORT_GI_80))
0181         return true;
0182     if (is_ht160(rate) && (vht_cap->cap &
0183                  IEEE80211_VHT_CAP_SHORT_GI_160))
0184         return true;
0185
0186     return false;
0187 }
0188
0189 static const struct rs_tx_column rs_tx_columns[] = {
0190     [RS_COLUMN_LEGACY_ANT_A] = {
0191         .mode = RS_LEGACY,
0192         .ant = ANT_A,
0193         .next_columns = {
0194             RS_COLUMN_LEGACY_ANT_B,
0195             RS_COLUMN_SISO_ANT_A,
0196             RS_COLUMN_MIMO2,
0197             RS_COLUMN_INVALID,
0198             RS_COLUMN_INVALID,
0199             RS_COLUMN_INVALID,
0200             RS_COLUMN_INVALID,
0201         },
0202         .checks = {
0203             rs_ant_allow,
0204         },
0205     },
0206     [RS_COLUMN_LEGACY_ANT_B] = {
0207         .mode = RS_LEGACY,
0208         .ant = ANT_B,
0209         .next_columns = {
0210             RS_COLUMN_LEGACY_ANT_A,
0211             RS_COLUMN_SISO_ANT_B,
0212             RS_COLUMN_MIMO2,
0213             RS_COLUMN_INVALID,
0214             RS_COLUMN_INVALID,
0215             RS_COLUMN_INVALID,
0216             RS_COLUMN_INVALID,
0217         },
0218         .checks = {
0219             rs_ant_allow,
0220         },
0221     },
0222     [RS_COLUMN_SISO_ANT_A] = {
0223         .mode = RS_SISO,
0224         .ant = ANT_A,
0225         .next_columns = {
0226             RS_COLUMN_SISO_ANT_B,
0227             RS_COLUMN_MIMO2,
0228             RS_COLUMN_SISO_ANT_A_SGI,
0229             RS_COLUMN_LEGACY_ANT_A,
0230             RS_COLUMN_LEGACY_ANT_B,
0231             RS_COLUMN_INVALID,
0232             RS_COLUMN_INVALID,
0233         },
0234         .checks = {
0235             rs_siso_allow,
0236             rs_ant_allow,
0237         },
0238     },
0239     [RS_COLUMN_SISO_ANT_B] = {
0240         .mode = RS_SISO,
0241         .ant = ANT_B,
0242         .next_columns = {
0243             RS_COLUMN_SISO_ANT_A,
0244             RS_COLUMN_MIMO2,
0245             RS_COLUMN_SISO_ANT_B_SGI,
0246             RS_COLUMN_LEGACY_ANT_A,
0247             RS_COLUMN_LEGACY_ANT_B,
0248             RS_COLUMN_INVALID,
0249             RS_COLUMN_INVALID,
0250         },
0251         .checks = {
0252             rs_siso_allow,
0253             rs_ant_allow,
0254         },
0255     },
0256     [RS_COLUMN_SISO_ANT_A_SGI] = {
0257         .mode = RS_SISO,
0258         .ant = ANT_A,
0259         .sgi = true,
0260         .next_columns = {
0261             RS_COLUMN_SISO_ANT_B_SGI,
0262             RS_COLUMN_MIMO2_SGI,
0263             RS_COLUMN_SISO_ANT_A,
0264             RS_COLUMN_LEGACY_ANT_A,
0265             RS_COLUMN_LEGACY_ANT_B,
0266             RS_COLUMN_INVALID,
0267             RS_COLUMN_INVALID,
0268         },
0269         .checks = {
0270             rs_siso_allow,
0271             rs_ant_allow,
0272             rs_sgi_allow,
0273         },
0274     },
0275     [RS_COLUMN_SISO_ANT_B_SGI] = {
0276         .mode = RS_SISO,
0277         .ant = ANT_B,
0278         .sgi = true,
0279         .next_columns = {
0280             RS_COLUMN_SISO_ANT_A_SGI,
0281             RS_COLUMN_MIMO2_SGI,
0282             RS_COLUMN_SISO_ANT_B,
0283             RS_COLUMN_LEGACY_ANT_A,
0284             RS_COLUMN_LEGACY_ANT_B,
0285             RS_COLUMN_INVALID,
0286             RS_COLUMN_INVALID,
0287         },
0288         .checks = {
0289             rs_siso_allow,
0290             rs_ant_allow,
0291             rs_sgi_allow,
0292         },
0293     },
0294     [RS_COLUMN_MIMO2] = {
0295         .mode = RS_MIMO2,
0296         .ant = ANT_AB,
0297         .next_columns = {
0298             RS_COLUMN_SISO_ANT_A,
0299             RS_COLUMN_MIMO2_SGI,
0300             RS_COLUMN_LEGACY_ANT_A,
0301             RS_COLUMN_LEGACY_ANT_B,
0302             RS_COLUMN_INVALID,
0303             RS_COLUMN_INVALID,
0304             RS_COLUMN_INVALID,
0305         },
0306         .checks = {
0307             rs_mimo_allow,
0308         },
0309     },
0310     [RS_COLUMN_MIMO2_SGI] = {
0311         .mode = RS_MIMO2,
0312         .ant = ANT_AB,
0313         .sgi = true,
0314         .next_columns = {
0315             RS_COLUMN_SISO_ANT_A_SGI,
0316             RS_COLUMN_MIMO2,
0317             RS_COLUMN_LEGACY_ANT_A,
0318             RS_COLUMN_LEGACY_ANT_B,
0319             RS_COLUMN_INVALID,
0320             RS_COLUMN_INVALID,
0321             RS_COLUMN_INVALID,
0322         },
0323         .checks = {
0324             rs_mimo_allow,
0325             rs_sgi_allow,
0326         },
0327     },
0328 };
0329
0330 static inline u8 rs_extract_rate(u32 rate_n_flags)
0331 {
0332     /* also works for HT because bits 7:6 are zero there */
0333     return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK_V1);
0334 }
0335
0336 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
0337 {
0338     int idx = 0;
0339
0340     if (rate_n_flags & RATE_MCS_HT_MSK_V1) {
0341         idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK_V1;
0342         idx += IWL_RATE_MCS_0_INDEX;
0343
0344         /* skip 9M not supported in HT*/
0345         if (idx >= IWL_RATE_9M_INDEX)
0346             idx += 1;
0347         if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
0348             return idx;
0349     } else if (rate_n_flags & RATE_MCS_VHT_MSK_V1 ||
0350            rate_n_flags & RATE_MCS_HE_MSK_V1) {
0351         idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
0352         idx += IWL_RATE_MCS_0_INDEX;
0353
0354         /* skip 9M not supported in VHT*/
0355         if (idx >= IWL_RATE_9M_INDEX)
0356             idx++;
0357         if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
0358             return idx;
0359         if ((rate_n_flags & RATE_MCS_HE_MSK_V1) &&
0360             idx <= IWL_LAST_HE_RATE)
0361             return idx;
0362     } else {
0363         /* legacy rate format, search for match in table */
0364
0365         u8 legacy_rate = rs_extract_rate(rate_n_flags);
0366         for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
0367             if (iwl_rates[idx].plcp == legacy_rate)
0368                 return idx;
0369     }
0370
0371     return IWL_RATE_INVALID;
0372 }
0373
0374 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
0375                   struct ieee80211_sta *sta,
0376                   struct iwl_lq_sta *lq_sta,
0377                   int tid, bool ndp);
0378 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
0379                struct ieee80211_sta *sta,
0380                struct iwl_lq_sta *lq_sta,
0381                const struct rs_rate *initial_rate);
0382 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
0383
0384 /*
0385  * The following tables contain the expected throughput metrics for all rates
0386  *
0387  *  1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
0388  *
0389  * where invalid entries are zeros.
0390  *
0391  * CCK rates are only valid in legacy table and will only be used in G
0392  * (2.4 GHz) band.
0393  */
0394 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
0395     7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
0396 };
0397
0398 /* Expected TpT tables. 4 indexes:
0399  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
0400  */
0401 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
0402     {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
0403     {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
0404     {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
0405     {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
0406 };
0407
0408 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
0409     {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
0410     {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
0411     {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
0412     {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
0413 };
0414
0415 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
0416     {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
0417     {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
0418     {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
0419     {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
0420 };
0421
0422 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
0423     {0, 0, 0, 0, 191, 0, 244, 288,  298,  308,  313,  318,  323,  328,  330},
0424     {0, 0, 0, 0, 200, 0, 251, 293,  302,  312,  317,  322,  327,  332,  334},
0425     {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
0426     {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
0427 };
0428
0429 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
0430     {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
0431     {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
0432     {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
0433     {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
0434 };
0435
0436 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
0437     {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
0438     {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
0439     {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
0440     {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
0441 };
0442
0443 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
0444     {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
0445     {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
0446     {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
0447     {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
0448 };
0449
0450 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
0451     {0, 0, 0, 0, 240, 0, 278,  308,  313,  319,  322,  324,  328,  330,   334},
0452     {0, 0, 0, 0, 247, 0, 282,  310,  315,  320,  323,  325,  329,  332,   338},
0453     {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629,  10592},
0454     {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
0455 };
0456
0457 static const char *rs_pretty_lq_type(enum iwl_table_type type)
0458 {
0459     static const char * const lq_types[] = {
0460         [LQ_NONE] = "NONE",
0461         [LQ_LEGACY_A] = "LEGACY_A",
0462         [LQ_LEGACY_G] = "LEGACY_G",
0463         [LQ_HT_SISO] = "HT SISO",
0464         [LQ_HT_MIMO2] = "HT MIMO",
0465         [LQ_VHT_SISO] = "VHT SISO",
0466         [LQ_VHT_MIMO2] = "VHT MIMO",
0467         [LQ_HE_SISO] = "HE SISO",
0468         [LQ_HE_MIMO2] = "HE MIMO",
0469     };
0470
0471     if (type < LQ_NONE || type >= LQ_MAX)
0472         return "UNKNOWN";
0473
0474     return lq_types[type];
0475 }
0476
0477 static char *rs_pretty_rate(const struct rs_rate *rate)
0478 {
0479     static char buf[40];
0480     static const char * const legacy_rates[] = {
0481         [IWL_RATE_1M_INDEX] = "1M",
0482         [IWL_RATE_2M_INDEX] = "2M",
0483         [IWL_RATE_5M_INDEX] = "5.5M",
0484         [IWL_RATE_11M_INDEX] = "11M",
0485         [IWL_RATE_6M_INDEX] = "6M",
0486         [IWL_RATE_9M_INDEX] = "9M",
0487         [IWL_RATE_12M_INDEX] = "12M",
0488         [IWL_RATE_18M_INDEX] = "18M",
0489         [IWL_RATE_24M_INDEX] = "24M",
0490         [IWL_RATE_36M_INDEX] = "36M",
0491         [IWL_RATE_48M_INDEX] = "48M",
0492         [IWL_RATE_54M_INDEX] = "54M",
0493     };
0494     static const char *const ht_vht_rates[] = {
0495         [IWL_RATE_MCS_0_INDEX] = "MCS0",
0496         [IWL_RATE_MCS_1_INDEX] = "MCS1",
0497         [IWL_RATE_MCS_2_INDEX] = "MCS2",
0498         [IWL_RATE_MCS_3_INDEX] = "MCS3",
0499         [IWL_RATE_MCS_4_INDEX] = "MCS4",
0500         [IWL_RATE_MCS_5_INDEX] = "MCS5",
0501         [IWL_RATE_MCS_6_INDEX] = "MCS6",
0502         [IWL_RATE_MCS_7_INDEX] = "MCS7",
0503         [IWL_RATE_MCS_8_INDEX] = "MCS8",
0504         [IWL_RATE_MCS_9_INDEX] = "MCS9",
0505     };
0506     const char *rate_str;
0507
0508     if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
0509         rate_str = legacy_rates[rate->index];
0510     else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
0511          (rate->index >= IWL_RATE_MCS_0_INDEX) &&
0512          (rate->index <= IWL_RATE_MCS_9_INDEX))
0513         rate_str = ht_vht_rates[rate->index];
0514     else
0515         rate_str = "BAD_RATE";
0516
0517     sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
0518         iwl_rs_pretty_ant(rate->ant), rate_str);
0519     return buf;
0520 }
0521
0522 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
0523                 const char *prefix)
0524 {
0525     IWL_DEBUG_RATE(mvm,
0526                "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
0527                prefix, rs_pretty_rate(rate), rate->bw,
0528                rate->sgi, rate->ldpc, rate->stbc);
0529 }
0530
0531 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
0532 {
0533     window->data = 0;
0534     window->success_counter = 0;
0535     window->success_ratio = IWL_INVALID_VALUE;
0536     window->counter = 0;
0537     window->average_tpt = IWL_INVALID_VALUE;
0538 }
0539
0540 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
0541                         struct iwl_scale_tbl_info *tbl)
0542 {
0543     int i;
0544
0545     IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
0546     for (i = 0; i < IWL_RATE_COUNT; i++)
0547         rs_rate_scale_clear_window(&tbl->win[i]);
0548
0549     for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
0550         rs_rate_scale_clear_window(&tbl->tpc_win[i]);
0551 }
0552
0553 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
0554 {
0555     return (ant_type & valid_antenna) == ant_type;
0556 }
0557
0558 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
0559                      struct iwl_lq_sta *lq_data, u8 tid,
0560                      struct ieee80211_sta *sta)
0561 {
0562     int ret;
0563
0564     IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
0565              sta->addr, tid);
0566
0567     /* start BA session until the peer sends del BA */
0568     ret = ieee80211_start_tx_ba_session(sta, tid, 0);
0569     if (ret == -EAGAIN) {
0570         /*
0571          * driver and mac80211 is out of sync
0572          * this might be cause by reloading firmware
0573          * stop the tx ba session here
0574          */
0575         IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
0576             tid);
0577         ieee80211_stop_tx_ba_session(sta, tid);
0578     }
0579     return ret;
0580 }
0581
0582 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
0583                   u8 tid, struct iwl_lq_sta *lq_sta,
0584                   struct ieee80211_sta *sta)
0585 {
0586     struct iwl_mvm_tid_data *tid_data;
0587
0588     /*
0589      * In AP mode, tid can be equal to IWL_MAX_TID_COUNT
0590      * when the frame is not QoS
0591      */
0592     if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) {
0593         IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
0594             tid, IWL_MAX_TID_COUNT);
0595         return;
0596     } else if (tid == IWL_MAX_TID_COUNT) {
0597         return;
0598     }
0599
0600     tid_data = &mvmsta->tid_data[tid];
0601     if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED &&
0602         tid_data->state == IWL_AGG_OFF &&
0603         (lq_sta->tx_agg_tid_en & BIT(tid)) &&
0604         tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) {
0605         IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid);
0606         if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0)
0607             tid_data->state = IWL_AGG_QUEUED;
0608     }
0609 }
0610
0611 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
0612 {
0613     return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
0614            !!(rate_n_flags & RATE_MCS_ANT_B_MSK);
0615 }
0616
0617 /*
0618  * Static function to get the expected throughput from an iwl_scale_tbl_info
0619  * that wraps a NULL pointer check
0620  */
0621 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
0622 {
0623     if (tbl->expected_tpt)
0624         return tbl->expected_tpt[rs_index];
0625     return 0;
0626 }
0627
0628 /*
0629  * rs_collect_tx_data - Update the success/failure sliding window
0630  *
0631  * We keep a sliding window of the last 62 packets transmitted
0632  * at this rate.  window->data contains the bitmask of successful
0633  * packets.
0634  */
0635 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
0636                    struct iwl_scale_tbl_info *tbl,
0637                    int scale_index, int attempts, int successes,
0638                    struct iwl_rate_scale_data *window)
0639 {
0640     static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
0641     s32 fail_count, tpt;
0642
0643     /* Get expected throughput */
0644     tpt = get_expected_tpt(tbl, scale_index);
0645
0646     /*
0647      * Keep track of only the latest 62 tx frame attempts in this rate's
0648      * history window; anything older isn't really relevant any more.
0649      * If we have filled up the sliding window, drop the oldest attempt;
0650      * if the oldest attempt (highest bit in bitmap) shows "success",
0651      * subtract "1" from the success counter (this is the main reason
0652      * we keep these bitmaps!).
0653      */
0654     while (attempts > 0) {
0655         if (window->counter >= IWL_RATE_MAX_WINDOW) {
0656             /* remove earliest */
0657             window->counter = IWL_RATE_MAX_WINDOW - 1;
0658
0659             if (window->data & mask) {
0660                 window->data &= ~mask;
0661                 window->success_counter--;
0662             }
0663         }
0664
0665         /* Increment frames-attempted counter */
0666         window->counter++;
0667
0668         /* Shift bitmap by one frame to throw away oldest history */
0669         window->data <<= 1;
0670
0671         /* Mark the most recent #successes attempts as successful */
0672         if (successes > 0) {
0673             window->success_counter++;
0674             window->data |= 0x1;
0675             successes--;
0676         }
0677
0678         attempts--;
0679     }
0680
0681     /* Calculate current success ratio, avoid divide-by-0! */
0682     if (window->counter > 0)
0683         window->success_ratio = 128 * (100 * window->success_counter)
0684                     / window->counter;
0685     else
0686         window->success_ratio = IWL_INVALID_VALUE;
0687
0688     fail_count = window->counter - window->success_counter;
0689
0690     /* Calculate average throughput, if we have enough history. */
0691     if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
0692         (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
0693         window->average_tpt = (window->success_ratio * tpt + 64) / 128;
0694     else
0695         window->average_tpt = IWL_INVALID_VALUE;
0696
0697     return 0;
0698 }
0699
0700 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
0701                    struct iwl_lq_sta *lq_sta,
0702                    struct iwl_scale_tbl_info *tbl,
0703                    int scale_index, int attempts, int successes,
0704                    u8 reduced_txp)
0705 {
0706     struct iwl_rate_scale_data *window = NULL;
0707
0708     if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
0709         return -EINVAL;
0710
0711     window = &tbl->tpc_win[reduced_txp];
0712     return  _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
0713                     window);
0714 }
0715
0716 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm,
0717                     struct iwl_mvm_sta *mvmsta,
0718                     u8 tid, int successes)
0719 {
0720     struct iwl_mvm_tid_data *tid_data;
0721
0722     if (tid >= IWL_MAX_TID_COUNT)
0723         return;
0724
0725     tid_data = &mvmsta->tid_data[tid];
0726
0727     /*
0728      * Measure if there're enough successful transmits per second.
0729      * These statistics are used only to decide if we can start a
0730      * BA session, so it should be updated only when A-MPDU is
0731      * off.
0732      */
0733     if (tid_data->state != IWL_AGG_OFF)
0734         return;
0735
0736     if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) ||
0737         (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) {
0738         tid_data->tx_count_last = tid_data->tx_count;
0739         tid_data->tx_count = 0;
0740         tid_data->tpt_meas_start = jiffies;
0741     } else {
0742         tid_data->tx_count += successes;
0743     }
0744 }
0745
0746 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
0747                    struct iwl_mvm_sta *mvmsta, u8 tid,
0748                    struct iwl_scale_tbl_info *tbl,
0749                    int scale_index, int attempts, int successes)
0750 {
0751     struct iwl_rate_scale_data *window = NULL;
0752
0753     if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
0754         return -EINVAL;
0755
0756     if (tbl->column != RS_COLUMN_INVALID) {
0757         struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers;
0758
0759         pers->tx_stats[tbl->column][scale_index].total += attempts;
0760         pers->tx_stats[tbl->column][scale_index].success += successes;
0761     }
0762
0763     rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes);
0764
0765     /* Select window for current tx bit rate */
0766     window = &(tbl->win[scale_index]);
0767     return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
0768                    window);
0769 }
0770
0771 /* Convert rs_rate object into ucode rate bitmask */
0772 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
0773                   struct rs_rate *rate)
0774 {
0775     u32 ucode_rate = 0;
0776     int index = rate->index;
0777
0778     ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
0779              RATE_MCS_ANT_AB_MSK);
0780
0781     if (is_legacy(rate)) {
0782         ucode_rate |= iwl_rates[index].plcp;
0783         if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
0784             ucode_rate |= RATE_MCS_CCK_MSK_V1;
0785         return ucode_rate;
0786     }
0787
0788     /* set RTS protection for all non legacy rates
0789      * This helps with congested environments reducing the conflict cost to
0790      * RTS retries only, instead of the entire BA packet.
0791      */
0792     ucode_rate |= RATE_MCS_RTS_REQUIRED_MSK;
0793
0794     if (is_ht(rate)) {
0795         if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
0796             IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
0797             index = IWL_LAST_HT_RATE;
0798         }
0799         ucode_rate |= RATE_MCS_HT_MSK_V1;
0800
0801         if (is_ht_siso(rate))
0802             ucode_rate |= iwl_rates[index].plcp_ht_siso;
0803         else if (is_ht_mimo2(rate))
0804             ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
0805         else
0806             WARN_ON_ONCE(1);
0807     } else if (is_vht(rate)) {
0808         if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
0809             IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
0810             index = IWL_LAST_VHT_RATE;
0811         }
0812         ucode_rate |= RATE_MCS_VHT_MSK_V1;
0813         if (is_vht_siso(rate))
0814             ucode_rate |= iwl_rates[index].plcp_vht_siso;
0815         else if (is_vht_mimo2(rate))
0816             ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
0817         else
0818             WARN_ON_ONCE(1);
0819
0820     } else {
0821         IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
0822     }
0823
0824     if (is_siso(rate) && rate->stbc) {
0825         /* To enable STBC we need to set both a flag and ANT_AB */
0826         ucode_rate |= RATE_MCS_ANT_AB_MSK;
0827         ucode_rate |= RATE_MCS_STBC_MSK;
0828     }
0829
0830     ucode_rate |= rate->bw;
0831     if (rate->sgi)
0832         ucode_rate |= RATE_MCS_SGI_MSK_V1;
0833     if (rate->ldpc)
0834         ucode_rate |= RATE_MCS_LDPC_MSK_V1;
0835
0836     return ucode_rate;
0837 }
0838
0839 /* Convert a ucode rate into an rs_rate object */
0840 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
0841                    enum nl80211_band band,
0842                    struct rs_rate *rate)
0843 {
0844     u32 ant_msk = ucode_rate & RATE_MCS_ANT_AB_MSK;
0845     u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
0846     u8 nss;
0847
0848     memset(rate, 0, sizeof(*rate));
0849     rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
0850
0851     if (rate->index == IWL_RATE_INVALID)
0852         return -EINVAL;
0853
0854     rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
0855
0856     /* Legacy */
0857     if (!(ucode_rate & RATE_MCS_HT_MSK_V1) &&
0858         !(ucode_rate & RATE_MCS_VHT_MSK_V1) &&
0859         !(ucode_rate & RATE_MCS_HE_MSK_V1)) {
0860         if (num_of_ant == 1) {
0861             if (band == NL80211_BAND_5GHZ)
0862                 rate->type = LQ_LEGACY_A;
0863             else
0864                 rate->type = LQ_LEGACY_G;
0865         }
0866
0867         return 0;
0868     }
0869
0870     /* HT, VHT or HE */
0871     if (ucode_rate & RATE_MCS_SGI_MSK_V1)
0872         rate->sgi = true;
0873     if (ucode_rate & RATE_MCS_LDPC_MSK_V1)
0874         rate->ldpc = true;
0875     if (ucode_rate & RATE_MCS_STBC_MSK)
0876         rate->stbc = true;
0877     if (ucode_rate & RATE_MCS_BF_MSK)
0878         rate->bfer = true;
0879
0880     rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK_V1;
0881
0882     if (ucode_rate & RATE_MCS_HT_MSK_V1) {
0883         nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK_V1) >>
0884                RATE_HT_MCS_NSS_POS_V1) + 1;
0885
0886         if (nss == 1) {
0887             rate->type = LQ_HT_SISO;
0888             WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
0889                   "stbc %d bfer %d",
0890                   rate->stbc, rate->bfer);
0891         } else if (nss == 2) {
0892             rate->type = LQ_HT_MIMO2;
0893             WARN_ON_ONCE(num_of_ant != 2);
0894         } else {
0895             WARN_ON_ONCE(1);
0896         }
0897     } else if (ucode_rate & RATE_MCS_VHT_MSK_V1) {
0898         nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
0899                RATE_VHT_MCS_NSS_POS) + 1;
0900
0901         if (nss == 1) {
0902             rate->type = LQ_VHT_SISO;
0903             WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
0904                   "stbc %d bfer %d",
0905                   rate->stbc, rate->bfer);
0906         } else if (nss == 2) {
0907             rate->type = LQ_VHT_MIMO2;
0908             WARN_ON_ONCE(num_of_ant != 2);
0909         } else {
0910             WARN_ON_ONCE(1);
0911         }
0912     } else if (ucode_rate & RATE_MCS_HE_MSK_V1) {
0913         nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
0914               RATE_VHT_MCS_NSS_POS) + 1;
0915
0916         if (nss == 1) {
0917             rate->type = LQ_HE_SISO;
0918             WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
0919                   "stbc %d bfer %d", rate->stbc, rate->bfer);
0920         } else if (nss == 2) {
0921             rate->type = LQ_HE_MIMO2;
0922             WARN_ON_ONCE(num_of_ant != 2);
0923         } else {
0924             WARN_ON_ONCE(1);
0925         }
0926     }
0927
0928     WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
0929              !is_he(rate) && !is_vht(rate));
0930
0931     return 0;
0932 }
0933
0934 /* switch to another antenna/antennas and return 1 */
0935 /* if no other valid antenna found, return 0 */
0936 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
0937 {
0938     u8 new_ant_type;
0939
0940     if (!rs_is_valid_ant(valid_ant, rate->ant))
0941         return 0;
0942
0943     new_ant_type = ant_toggle_lookup[rate->ant];
0944
0945     while ((new_ant_type != rate->ant) &&
0946            !rs_is_valid_ant(valid_ant, new_ant_type))
0947         new_ant_type = ant_toggle_lookup[new_ant_type];
0948
0949     if (new_ant_type == rate->ant)
0950         return 0;
0951
0952     rate->ant = new_ant_type;
0953
0954     return 1;
0955 }
0956
0957 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
0958                   struct rs_rate *rate)
0959 {
0960     if (is_legacy(rate))
0961         return lq_sta->active_legacy_rate;
0962     else if (is_siso(rate))
0963         return lq_sta->active_siso_rate;
0964     else if (is_mimo2(rate))
0965         return lq_sta->active_mimo2_rate;
0966
0967     WARN_ON_ONCE(1);
0968     return 0;
0969 }
0970
0971 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
0972                 int rate_type)
0973 {
0974     u8 high = IWL_RATE_INVALID;
0975     u8 low = IWL_RATE_INVALID;
0976
0977     /* 802.11A or ht walks to the next literal adjacent rate in
0978      * the rate table */
0979     if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
0980         int i;
0981         u32 mask;
0982
0983         /* Find the previous rate that is in the rate mask */
0984         i = index - 1;
0985         if (i >= 0)
0986             mask = BIT(i);
0987         for (; i >= 0; i--, mask >>= 1) {
0988             if (rate_mask & mask) {
0989                 low = i;
0990                 break;
0991             }
0992         }
0993
0994         /* Find the next rate that is in the rate mask */
0995         i = index + 1;
0996         for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
0997             if (rate_mask & mask) {
0998                 high = i;
0999                 break;
1000             }
1001         }
1002
1003         return (high << 8) | low;
1004     }
1005
1006     low = index;
1007     while (low != IWL_RATE_INVALID) {
1008         low = iwl_rates[low].prev_rs;
1009         if (low == IWL_RATE_INVALID)
1010             break;
1011         if (rate_mask & (1 << low))
1012             break;
1013     }
1014
1015     high = index;
1016     while (high != IWL_RATE_INVALID) {
1017         high = iwl_rates[high].next_rs;
1018         if (high == IWL_RATE_INVALID)
1019             break;
1020         if (rate_mask & (1 << high))
1021             break;
1022     }
1023
1024     return (high << 8) | low;
1025 }
1026
1027 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1028                      struct rs_rate *rate)
1029 {
1030     return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1031 }
1032
1033 /* Get the next supported lower rate in the current column.
1034  * Return true if bottom rate in the current column was reached
1035  */
1036 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1037                     struct rs_rate *rate)
1038 {
1039     u8 low;
1040     u16 high_low;
1041     u16 rate_mask;
1042     struct iwl_mvm *mvm = lq_sta->pers.drv;
1043
1044     rate_mask = rs_get_supported_rates(lq_sta, rate);
1045     high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1046                     rate->type);
1047     low = high_low & 0xff;
1048
1049     /* Bottom rate of column reached */
1050     if (low == IWL_RATE_INVALID)
1051         return true;
1052
1053     rate->index = low;
1054     return false;
1055 }
1056
1057 /* Get the next rate to use following a column downgrade */
1058 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1059                       struct rs_rate *rate)
1060 {
1061     struct iwl_mvm *mvm = lq_sta->pers.drv;
1062
1063     if (is_legacy(rate)) {
1064         /* No column to downgrade from Legacy */
1065         return;
1066     } else if (is_siso(rate)) {
1067         /* Downgrade to Legacy if we were in SISO */
1068         if (lq_sta->band == NL80211_BAND_5GHZ)
1069             rate->type = LQ_LEGACY_A;
1070         else
1071             rate->type = LQ_LEGACY_G;
1072
1073         rate->bw = RATE_MCS_CHAN_WIDTH_20;
1074
1075         WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1076                  rate->index > IWL_RATE_MCS_9_INDEX);
1077
1078         rate->index = rs_ht_to_legacy[rate->index];
1079         rate->ldpc = false;
1080     } else {
1081         /* Downgrade to SISO with same MCS if in MIMO  */
1082         rate->type = is_vht_mimo2(rate) ?
1083             LQ_VHT_SISO : LQ_HT_SISO;
1084     }
1085
1086     if (num_of_ant(rate->ant) > 1)
1087         rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1088
1089     /* Relevant in both switching to SISO or Legacy */
1090     rate->sgi = false;
1091
1092     if (!rs_rate_supported(lq_sta, rate))
1093         rs_get_lower_rate_in_column(lq_sta, rate);
1094 }
1095
1096 /* Check if both rates share the same column */
1097 static inline bool rs_rate_column_match(struct rs_rate *a,
1098                     struct rs_rate *b)
1099 {
1100     bool ant_match;
1101
1102     if (a->stbc || a->bfer)
1103         ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1104     else
1105         ant_match = (a->ant == b->ant);
1106
1107     return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1108         && ant_match;
1109 }
1110
1111 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1112 {
1113     if (is_legacy(rate)) {
1114         if (rate->ant == ANT_A)
1115             return RS_COLUMN_LEGACY_ANT_A;
1116
1117         if (rate->ant == ANT_B)
1118             return RS_COLUMN_LEGACY_ANT_B;
1119
1120         goto err;
1121     }
1122
1123     if (is_siso(rate)) {
1124         if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1125             return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1126                 RS_COLUMN_SISO_ANT_A;
1127
1128         if (rate->ant == ANT_B)
1129             return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1130                 RS_COLUMN_SISO_ANT_B;
1131
1132         goto err;
1133     }
1134
1135     if (is_mimo(rate))
1136         return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1137
1138 err:
1139     return RS_COLUMN_INVALID;
1140 }
1141
1142 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1143 {
1144     u8 tid = IWL_MAX_TID_COUNT;
1145
1146     if (ieee80211_is_data_qos(hdr->frame_control)) {
1147         u8 *qc = ieee80211_get_qos_ctl(hdr);
1148         tid = qc[0] & 0xf;
1149     }
1150
1151     if (unlikely(tid > IWL_MAX_TID_COUNT))
1152         tid = IWL_MAX_TID_COUNT;
1153
1154     return tid;
1155 }
1156
1157 /*
1158  * mac80211 sends us Tx status
1159  */
1160 static void rs_drv_mac80211_tx_status(void *mvm_r,
1161                       struct ieee80211_supported_band *sband,
1162                       struct ieee80211_sta *sta, void *priv_sta,
1163                       struct sk_buff *skb)
1164 {
1165     struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1166     struct iwl_op_mode *op_mode = mvm_r;
1167     struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1168     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1169     struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1170
1171     if (!mvmsta->vif)
1172         return;
1173
1174     if (!ieee80211_is_data(hdr->frame_control) ||
1175         info->flags & IEEE80211_TX_CTL_NO_ACK)
1176         return;
1177
1178     iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1179                  ieee80211_is_qos_nullfunc(hdr->frame_control));
1180 }
1181
1182 /*
1183  * Begin a period of staying with a selected modulation mode.
1184  * Set "stay_in_tbl" flag to prevent any mode switches.
1185  * Set frame tx success limits according to legacy vs. high-throughput,
1186  * and reset overall (spanning all rates) tx success history statistics.
1187  * These control how long we stay using same modulation mode before
1188  * searching for a new mode.
1189  */
1190 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1191                  struct iwl_lq_sta *lq_sta)
1192 {
1193     IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1194     lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1195     if (is_legacy) {
1196         lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1197         lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1198         lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1199     } else {
1200         lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1201         lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1202         lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1203     }
1204     lq_sta->table_count = 0;
1205     lq_sta->total_failed = 0;
1206     lq_sta->total_success = 0;
1207     lq_sta->flush_timer = jiffies;
1208     lq_sta->visited_columns = 0;
1209 }
1210
1211 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1212 {
1213     if (rate_mask)
1214         return find_last_bit(&rate_mask, BITS_PER_LONG);
1215     return IWL_RATE_INVALID;
1216 }
1217
1218 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1219                    const struct rs_tx_column *column)
1220 {
1221     switch (column->mode) {
1222     case RS_LEGACY:
1223         return lq_sta->max_legacy_rate_idx;
1224     case RS_SISO:
1225         return lq_sta->max_siso_rate_idx;
1226     case RS_MIMO2:
1227         return lq_sta->max_mimo2_rate_idx;
1228     default:
1229         WARN_ON_ONCE(1);
1230     }
1231
1232     return lq_sta->max_legacy_rate_idx;
1233 }
1234
1235 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1236                         const struct rs_tx_column *column,
1237                         u32 bw)
1238 {
1239     /* Used to choose among HT tables */
1240     const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1241
1242     if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1243              column->mode != RS_SISO &&
1244              column->mode != RS_MIMO2))
1245         return expected_tpt_legacy;
1246
1247     /* Legacy rates have only one table */
1248     if (column->mode == RS_LEGACY)
1249         return expected_tpt_legacy;
1250
1251     ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1252     /* Choose among many HT tables depending on number of streams
1253      * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1254      * status */
1255     if (column->mode == RS_SISO) {
1256         switch (bw) {
1257         case RATE_MCS_CHAN_WIDTH_20:
1258             ht_tbl_pointer = expected_tpt_siso_20MHz;
1259             break;
1260         case RATE_MCS_CHAN_WIDTH_40:
1261             ht_tbl_pointer = expected_tpt_siso_40MHz;
1262             break;
1263         case RATE_MCS_CHAN_WIDTH_80:
1264             ht_tbl_pointer = expected_tpt_siso_80MHz;
1265             break;
1266         case RATE_MCS_CHAN_WIDTH_160:
1267             ht_tbl_pointer = expected_tpt_siso_160MHz;
1268             break;
1269         default:
1270             WARN_ON_ONCE(1);
1271         }
1272     } else if (column->mode == RS_MIMO2) {
1273         switch (bw) {
1274         case RATE_MCS_CHAN_WIDTH_20:
1275             ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1276             break;
1277         case RATE_MCS_CHAN_WIDTH_40:
1278             ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1279             break;
1280         case RATE_MCS_CHAN_WIDTH_80:
1281             ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1282             break;
1283         case RATE_MCS_CHAN_WIDTH_160:
1284             ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1285             break;
1286         default:
1287             WARN_ON_ONCE(1);
1288         }
1289     } else {
1290         WARN_ON_ONCE(1);
1291     }
1292
1293     if (!column->sgi && !lq_sta->is_agg)        /* Normal */
1294         return ht_tbl_pointer[0];
1295     else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1296         return ht_tbl_pointer[1];
1297     else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1298         return ht_tbl_pointer[2];
1299     else                        /* AGG+SGI */
1300         return ht_tbl_pointer[3];
1301 }
1302
1303 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1304                       struct iwl_scale_tbl_info *tbl)
1305 {
1306     struct rs_rate *rate = &tbl->rate;
1307     const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1308
1309     tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1310 }
1311
1312 /* rs uses two tables, one is active and the second is for searching better
1313  * configuration. This function, according to the index of the currently
1314  * active table returns the search table, which is located at the
1315  * index complementary to 1 according to the active table (active = 1,
1316  * search = 0 or active = 0, search = 1).
1317  * Since lq_info is an arary of size 2, make sure index cannot be out of bounds.
1318  */
1319 static inline u8 rs_search_tbl(u8 active_tbl)
1320 {
1321     return (active_tbl ^ 1) & 1;
1322 }
1323
1324 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1325                 struct iwl_lq_sta *lq_sta,
1326                 struct iwl_scale_tbl_info *tbl, /* "search" */
1327                 unsigned long rate_mask, s8 index)
1328 {
1329     struct iwl_scale_tbl_info *active_tbl =
1330         &(lq_sta->lq_info[lq_sta->active_tbl]);
1331     s32 success_ratio = active_tbl->win[index].success_ratio;
1332     u16 expected_current_tpt = active_tbl->expected_tpt[index];
1333     const u16 *tpt_tbl = tbl->expected_tpt;
1334     u16 high_low;
1335     u32 target_tpt;
1336     int rate_idx;
1337
1338     if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1339         target_tpt = 100 * expected_current_tpt;
1340         IWL_DEBUG_RATE(mvm,
1341                    "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1342                    success_ratio, target_tpt);
1343     } else {
1344         target_tpt = lq_sta->last_tpt;
1345         IWL_DEBUG_RATE(mvm,
1346                    "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1347                    success_ratio, target_tpt);
1348     }
1349
1350     rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1351
1352     while (rate_idx != IWL_RATE_INVALID) {
1353         if (target_tpt < (100 * tpt_tbl[rate_idx]))
1354             break;
1355
1356         high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1357                         tbl->rate.type);
1358
1359         rate_idx = (high_low >> 8) & 0xff;
1360     }
1361
1362     IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1363                rate_idx, target_tpt,
1364                rate_idx != IWL_RATE_INVALID ?
1365                100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1366
1367     return rate_idx;
1368 }
1369
1370 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1371 {
1372     struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->deflink.vht_cap;
1373     struct ieee80211_vht_cap vht_cap = {
1374         .vht_cap_info = cpu_to_le32(sta_vht_cap->cap),
1375         .supp_mcs = sta_vht_cap->vht_mcs,
1376     };
1377
1378     switch (sta->deflink.bandwidth) {
1379     case IEEE80211_STA_RX_BW_160:
1380         /*
1381          * Don't use 160 MHz if VHT extended NSS support
1382          * says we cannot use 2 streams, we don't want to
1383          * deal with this.
1384          * We only check MCS 0 - they will support that if
1385          * we got here at all and we don't care which MCS,
1386          * we want to determine a more global state.
1387          */
1388         if (ieee80211_get_vht_max_nss(&vht_cap,
1389                           IEEE80211_VHT_CHANWIDTH_160MHZ,
1390                           0, true,
1391                           sta->deflink.rx_nss) < sta->deflink.rx_nss)
1392             return RATE_MCS_CHAN_WIDTH_80;
1393         return RATE_MCS_CHAN_WIDTH_160;
1394     case IEEE80211_STA_RX_BW_80:
1395         return RATE_MCS_CHAN_WIDTH_80;
1396     case IEEE80211_STA_RX_BW_40:
1397         return RATE_MCS_CHAN_WIDTH_40;
1398     case IEEE80211_STA_RX_BW_20:
1399     default:
1400         return RATE_MCS_CHAN_WIDTH_20;
1401     }
1402 }
1403
1404 /*
1405  * Check whether we should continue using same modulation mode, or
1406  * begin search for a new mode, based on:
1407  * 1) # tx successes or failures while using this mode
1408  * 2) # times calling this function
1409  * 3) elapsed time in this mode (not used, for now)
1410  */
1411 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1412 {
1413     struct iwl_scale_tbl_info *tbl;
1414     int active_tbl;
1415     int flush_interval_passed = 0;
1416     struct iwl_mvm *mvm;
1417
1418     mvm = lq_sta->pers.drv;
1419     active_tbl = lq_sta->active_tbl;
1420
1421     tbl = &(lq_sta->lq_info[active_tbl]);
1422
1423     /* If we've been disallowing search, see if we should now allow it */
1424     if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1425         /* Elapsed time using current modulation mode */
1426         if (lq_sta->flush_timer)
1427             flush_interval_passed =
1428                 time_after(jiffies,
1429                        (unsigned long)(lq_sta->flush_timer +
1430                                (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1431
1432         /*
1433          * Check if we should allow search for new modulation mode.
1434          * If many frames have failed or succeeded, or we've used
1435          * this same modulation for a long time, allow search, and
1436          * reset history stats that keep track of whether we should
1437          * allow a new search.  Also (below) reset all bitmaps and
1438          * stats in active history.
1439          */
1440         if (force_search ||
1441             (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1442             (lq_sta->total_success > lq_sta->max_success_limit) ||
1443             ((!lq_sta->search_better_tbl) &&
1444              (lq_sta->flush_timer) && (flush_interval_passed))) {
1445             IWL_DEBUG_RATE(mvm,
1446                        "LQ: stay is expired %d %d %d\n",
1447                      lq_sta->total_failed,
1448                      lq_sta->total_success,
1449                      flush_interval_passed);
1450
1451             /* Allow search for new mode */
1452             lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1453             IWL_DEBUG_RATE(mvm,
1454                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1455             lq_sta->total_failed = 0;
1456             lq_sta->total_success = 0;
1457             lq_sta->flush_timer = 0;
1458             /* mark the current column as visited */
1459             lq_sta->visited_columns = BIT(tbl->column);
1460         /*
1461          * Else if we've used this modulation mode enough repetitions
1462          * (regardless of elapsed time or success/failure), reset
1463          * history bitmaps and rate-specific stats for all rates in
1464          * active table.
1465          */
1466         } else {
1467             lq_sta->table_count++;
1468             if (lq_sta->table_count >=
1469                 lq_sta->table_count_limit) {
1470                 lq_sta->table_count = 0;
1471
1472                 IWL_DEBUG_RATE(mvm,
1473                            "LQ: stay in table clear win\n");
1474                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1475             }
1476         }
1477
1478         /* If transitioning to allow "search", reset all history
1479          * bitmaps and stats in active table (this will become the new
1480          * "search" table). */
1481         if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1482             rs_rate_scale_clear_tbl_windows(mvm, tbl);
1483         }
1484     }
1485 }
1486
1487 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1488                  struct iwl_scale_tbl_info *tbl,
1489                  enum rs_action scale_action)
1490 {
1491     struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1492     int i;
1493
1494     sta->max_amsdu_len = rs_fw_get_max_amsdu_len(sta);
1495
1496     /*
1497      * In case TLC offload is not active amsdu_enabled is either 0xFFFF
1498      * or 0, since there is no per-TID alg.
1499      */
1500     if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1501         tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1502         scale_action == RS_ACTION_DOWNSCALE)
1503         mvmsta->amsdu_enabled = 0;
1504     else
1505         mvmsta->amsdu_enabled = 0xFFFF;
1506
1507     if (mvmsta->vif->bss_conf.he_support &&
1508         !iwlwifi_mod_params.disable_11ax)
1509         mvmsta->max_amsdu_len = sta->max_amsdu_len;
1510     else
1511         mvmsta->max_amsdu_len = min_t(int, sta->max_amsdu_len, 8500);
1512
1513     sta->max_rc_amsdu_len = mvmsta->max_amsdu_len;
1514
1515     for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
1516         if (mvmsta->amsdu_enabled)
1517             sta->max_tid_amsdu_len[i] =
1518                 iwl_mvm_max_amsdu_size(mvm, sta, i);
1519         else
1520             /*
1521              * Not so elegant, but this will effectively
1522              * prevent AMSDU on this TID
1523              */
1524             sta->max_tid_amsdu_len[i] = 1;
1525     }
1526 }
1527
1528 /*
1529  * setup rate table in uCode
1530  */
1531 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1532                    struct ieee80211_sta *sta,
1533                    struct iwl_lq_sta *lq_sta,
1534                    struct iwl_scale_tbl_info *tbl)
1535 {
1536     rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1537     iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
1538 }
1539
1540 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1541                   struct ieee80211_sta *sta,
1542                   struct iwl_lq_sta *lq_sta,
1543                   struct iwl_scale_tbl_info *tbl,
1544                   enum rs_action scale_action)
1545 {
1546     if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80)
1547         return false;
1548
1549     if (!is_vht_siso(&tbl->rate))
1550         return false;
1551
1552     if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1553         (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1554         (scale_action == RS_ACTION_DOWNSCALE)) {
1555         tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1556         tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1557         IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1558         goto tweaked;
1559     }
1560
1561     /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1562      * sustainable, i.e. we're past the test window. We can't go back
1563      * if MCS5 is just tested as this will happen always after switching
1564      * to 20Mhz MCS4 because the rate stats are cleared.
1565      */
1566     if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1567         (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1568          (scale_action == RS_ACTION_STAY)) ||
1569          ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1570           (scale_action == RS_ACTION_UPSCALE)))) {
1571         tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1572         tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1573         IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1574         goto tweaked;
1575     }
1576
1577     return false;
1578
1579 tweaked:
1580     rs_set_expected_tpt_table(lq_sta, tbl);
1581     rs_rate_scale_clear_tbl_windows(mvm, tbl);
1582     return true;
1583 }
1584
1585 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1586                      struct iwl_lq_sta *lq_sta,
1587                      struct ieee80211_sta *sta,
1588                      struct iwl_scale_tbl_info *tbl)
1589 {
1590     int i, j, max_rate;
1591     enum rs_column next_col_id;
1592     const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1593     const struct rs_tx_column *next_col;
1594     allow_column_func_t allow_func;
1595     u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1596     const u16 *expected_tpt_tbl;
1597     u16 tpt, max_expected_tpt;
1598
1599     for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1600         next_col_id = curr_col->next_columns[i];
1601
1602         if (next_col_id == RS_COLUMN_INVALID)
1603             continue;
1604
1605         if (lq_sta->visited_columns & BIT(next_col_id)) {
1606             IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1607                        next_col_id);
1608             continue;
1609         }
1610
1611         next_col = &rs_tx_columns[next_col_id];
1612
1613         if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1614             IWL_DEBUG_RATE(mvm,
1615                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1616                        next_col_id, valid_ants, next_col->ant);
1617             continue;
1618         }
1619
1620         for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1621             allow_func = next_col->checks[j];
1622             if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1623                               next_col))
1624                 break;
1625         }
1626
1627         if (j != MAX_COLUMN_CHECKS) {
1628             IWL_DEBUG_RATE(mvm,
1629                        "Skip column %d: not allowed (check %d failed)\n",
1630                        next_col_id, j);
1631
1632             continue;
1633         }
1634
1635         tpt = lq_sta->last_tpt / 100;
1636         expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1637                              rs_bw_from_sta_bw(sta));
1638         if (WARN_ON_ONCE(!expected_tpt_tbl))
1639             continue;
1640
1641         max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1642         if (max_rate == IWL_RATE_INVALID) {
1643             IWL_DEBUG_RATE(mvm,
1644                        "Skip column %d: no rate is allowed in this column\n",
1645                        next_col_id);
1646             continue;
1647         }
1648
1649         max_expected_tpt = expected_tpt_tbl[max_rate];
1650         if (tpt >= max_expected_tpt) {
1651             IWL_DEBUG_RATE(mvm,
1652                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1653                        next_col_id, max_expected_tpt, tpt);
1654             continue;
1655         }
1656
1657         IWL_DEBUG_RATE(mvm,
1658                    "Found potential column %d. Max expected %d current %d\n",
1659                    next_col_id, max_expected_tpt, tpt);
1660         break;
1661     }
1662
1663     if (i == MAX_NEXT_COLUMNS)
1664         return RS_COLUMN_INVALID;
1665
1666     return next_col_id;
1667 }
1668
1669 static int rs_switch_to_column(struct iwl_mvm *mvm,
1670                    struct iwl_lq_sta *lq_sta,
1671                    struct ieee80211_sta *sta,
1672                    enum rs_column col_id)
1673 {
1674     struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
1675     struct iwl_scale_tbl_info *search_tbl =
1676         &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
1677     struct rs_rate *rate = &search_tbl->rate;
1678     const struct rs_tx_column *column = &rs_tx_columns[col_id];
1679     const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1680     unsigned long rate_mask = 0;
1681     u32 rate_idx = 0;
1682
1683     memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1684
1685     rate->sgi = column->sgi;
1686     rate->ant = column->ant;
1687
1688     if (column->mode == RS_LEGACY) {
1689         if (lq_sta->band == NL80211_BAND_5GHZ)
1690             rate->type = LQ_LEGACY_A;
1691         else
1692             rate->type = LQ_LEGACY_G;
1693
1694         rate->bw = RATE_MCS_CHAN_WIDTH_20;
1695         rate->ldpc = false;
1696         rate_mask = lq_sta->active_legacy_rate;
1697     } else if (column->mode == RS_SISO) {
1698         rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1699         rate_mask = lq_sta->active_siso_rate;
1700     } else if (column->mode == RS_MIMO2) {
1701         rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1702         rate_mask = lq_sta->active_mimo2_rate;
1703     } else {
1704         WARN_ONCE(1, "Bad column mode");
1705     }
1706
1707     if (column->mode != RS_LEGACY) {
1708         rate->bw = rs_bw_from_sta_bw(sta);
1709         rate->ldpc = lq_sta->ldpc;
1710     }
1711
1712     search_tbl->column = col_id;
1713     rs_set_expected_tpt_table(lq_sta, search_tbl);
1714
1715     lq_sta->visited_columns |= BIT(col_id);
1716
1717     /* Get the best matching rate if we're changing modes. e.g.
1718      * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1719      */
1720     if (curr_column->mode != column->mode) {
1721         rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1722                         rate_mask, rate->index);
1723
1724         if ((rate_idx == IWL_RATE_INVALID) ||
1725             !(BIT(rate_idx) & rate_mask)) {
1726             IWL_DEBUG_RATE(mvm,
1727                        "can not switch with index %d"
1728                        " rate mask %lx\n",
1729                        rate_idx, rate_mask);
1730
1731             goto err;
1732         }
1733
1734         rate->index = rate_idx;
1735     }
1736
1737     IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1738                col_id, rate->index);
1739
1740     return 0;
1741
1742 err:
1743     rate->type = LQ_NONE;
1744     return -1;
1745 }
1746
1747 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1748                      struct iwl_scale_tbl_info *tbl,
1749                      s32 sr, int low, int high,
1750                      int current_tpt,
1751                      int low_tpt, int high_tpt)
1752 {
1753     enum rs_action action = RS_ACTION_STAY;
1754
1755     if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1756         (current_tpt == 0)) {
1757         IWL_DEBUG_RATE(mvm,
1758                    "Decrease rate because of low SR\n");
1759         return RS_ACTION_DOWNSCALE;
1760     }
1761
1762     if ((low_tpt == IWL_INVALID_VALUE) &&
1763         (high_tpt == IWL_INVALID_VALUE) &&
1764         (high != IWL_RATE_INVALID)) {
1765         IWL_DEBUG_RATE(mvm,
1766                    "No data about high/low rates. Increase rate\n");
1767         return RS_ACTION_UPSCALE;
1768     }
1769
1770     if ((high_tpt == IWL_INVALID_VALUE) &&
1771         (high != IWL_RATE_INVALID) &&
1772         (low_tpt != IWL_INVALID_VALUE) &&
1773         (low_tpt < current_tpt)) {
1774         IWL_DEBUG_RATE(mvm,
1775                    "No data about high rate and low rate is worse. Increase rate\n");
1776         return RS_ACTION_UPSCALE;
1777     }
1778
1779     if ((high_tpt != IWL_INVALID_VALUE) &&
1780         (high_tpt > current_tpt)) {
1781         IWL_DEBUG_RATE(mvm,
1782                    "Higher rate is better. Increate rate\n");
1783         return RS_ACTION_UPSCALE;
1784     }
1785
1786     if ((low_tpt != IWL_INVALID_VALUE) &&
1787         (high_tpt != IWL_INVALID_VALUE) &&
1788         (low_tpt < current_tpt) &&
1789         (high_tpt < current_tpt)) {
1790         IWL_DEBUG_RATE(mvm,
1791                    "Both high and low are worse. Maintain rate\n");
1792         return RS_ACTION_STAY;
1793     }
1794
1795     if ((low_tpt != IWL_INVALID_VALUE) &&
1796         (low_tpt > current_tpt)) {
1797         IWL_DEBUG_RATE(mvm,
1798                    "Lower rate is better\n");
1799         action = RS_ACTION_DOWNSCALE;
1800         goto out;
1801     }
1802
1803     if ((low_tpt == IWL_INVALID_VALUE) &&
1804         (low != IWL_RATE_INVALID)) {
1805         IWL_DEBUG_RATE(mvm,
1806                    "No data about lower rate\n");
1807         action = RS_ACTION_DOWNSCALE;
1808         goto out;
1809     }
1810
1811     IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1812
1813 out:
1814     if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1815         if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1816             IWL_DEBUG_RATE(mvm,
1817                        "SR is above NO DECREASE. Avoid downscale\n");
1818             action = RS_ACTION_STAY;
1819         } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1820             IWL_DEBUG_RATE(mvm,
1821                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1822             action = RS_ACTION_STAY;
1823         } else {
1824             IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1825         }
1826     }
1827
1828     return action;
1829 }
1830
1831 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1832               struct iwl_lq_sta *lq_sta)
1833 {
1834     /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1835      * supports STBC of at least 1*SS
1836      */
1837     if (!lq_sta->stbc_capable)
1838         return false;
1839
1840     if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1841         return false;
1842
1843     return true;
1844 }
1845
1846 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1847                 int *weaker, int *stronger)
1848 {
1849     *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1850     if (*weaker > TPC_MAX_REDUCTION)
1851         *weaker = TPC_INVALID;
1852
1853     *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1854     if (*stronger < 0)
1855         *stronger = TPC_INVALID;
1856 }
1857
1858 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1859                struct rs_rate *rate, enum nl80211_band band)
1860 {
1861     int index = rate->index;
1862     bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1863     bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1864                 !vif->cfg.ps);
1865
1866     IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1867                cam, sta_ps_disabled);
1868     /*
1869      * allow tpc only if power management is enabled, or bt coex
1870      * activity grade allows it and we are on 2.4Ghz.
1871      */
1872     if ((cam || sta_ps_disabled) &&
1873         !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1874         return false;
1875
1876     IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1877     if (is_legacy(rate))
1878         return index == IWL_RATE_54M_INDEX;
1879     if (is_ht(rate))
1880         return index == IWL_RATE_MCS_7_INDEX;
1881     if (is_vht(rate))
1882         return index == IWL_RATE_MCS_9_INDEX;
1883
1884     WARN_ON_ONCE(1);
1885     return false;
1886 }
1887
1888 enum tpc_action {
1889     TPC_ACTION_STAY,
1890     TPC_ACTION_DECREASE,
1891     TPC_ACTION_INCREASE,
1892     TPC_ACTION_NO_RESTIRCTION,
1893 };
1894
1895 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1896                      s32 sr, int weak, int strong,
1897                      int current_tpt,
1898                      int weak_tpt, int strong_tpt)
1899 {
1900     /* stay until we have valid tpt */
1901     if (current_tpt == IWL_INVALID_VALUE) {
1902         IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1903         return TPC_ACTION_STAY;
1904     }
1905
1906     /* Too many failures, increase txp */
1907     if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1908         current_tpt == 0) {
1909         IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1910         return TPC_ACTION_NO_RESTIRCTION;
1911     }
1912
1913     /* try decreasing first if applicable */
1914     if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1915         weak != TPC_INVALID) {
1916         if (weak_tpt == IWL_INVALID_VALUE &&
1917             (strong_tpt == IWL_INVALID_VALUE ||
1918              current_tpt >= strong_tpt)) {
1919             IWL_DEBUG_RATE(mvm,
1920                        "no weak txp measurement. decrease txp\n");
1921             return TPC_ACTION_DECREASE;
1922         }
1923
1924         if (weak_tpt > current_tpt) {
1925             IWL_DEBUG_RATE(mvm,
1926                        "lower txp has better tpt. decrease txp\n");
1927             return TPC_ACTION_DECREASE;
1928         }
1929     }
1930
1931     /* next, increase if needed */
1932     if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1933         strong != TPC_INVALID) {
1934         if (weak_tpt == IWL_INVALID_VALUE &&
1935             strong_tpt != IWL_INVALID_VALUE &&
1936             current_tpt < strong_tpt) {
1937             IWL_DEBUG_RATE(mvm,
1938                        "higher txp has better tpt. increase txp\n");
1939             return TPC_ACTION_INCREASE;
1940         }
1941
1942         if (weak_tpt < current_tpt &&
1943             (strong_tpt == IWL_INVALID_VALUE ||
1944              strong_tpt > current_tpt)) {
1945             IWL_DEBUG_RATE(mvm,
1946                        "lower txp has worse tpt. increase txp\n");
1947             return TPC_ACTION_INCREASE;
1948         }
1949     }
1950
1951     IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1952     return TPC_ACTION_STAY;
1953 }
1954
1955 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1956                struct ieee80211_sta *sta,
1957                struct iwl_lq_sta *lq_sta,
1958                struct iwl_scale_tbl_info *tbl)
1959 {
1960     struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1961     struct ieee80211_vif *vif = mvm_sta->vif;
1962     struct ieee80211_chanctx_conf *chanctx_conf;
1963     enum nl80211_band band;
1964     struct iwl_rate_scale_data *window;
1965     struct rs_rate *rate = &tbl->rate;
1966     enum tpc_action action;
1967     s32 sr;
1968     u8 cur = lq_sta->lq.reduced_tpc;
1969     int current_tpt;
1970     int weak, strong;
1971     int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1972
1973 #ifdef CONFIG_MAC80211_DEBUGFS
1974     if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1975         IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1976                    lq_sta->pers.dbg_fixed_txp_reduction);
1977         lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1978         return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1979     }
1980 #endif
1981
1982     rcu_read_lock();
1983     chanctx_conf = rcu_dereference(vif->bss_conf.chanctx_conf);
1984     if (WARN_ON(!chanctx_conf))
1985         band = NUM_NL80211_BANDS;
1986     else
1987         band = chanctx_conf->def.chan->band;
1988     rcu_read_unlock();
1989
1990     if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1991         IWL_DEBUG_RATE(mvm,
1992                    "tpc is not allowed. remove txp restrictions\n");
1993         lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1994         return cur != TPC_NO_REDUCTION;
1995     }
1996
1997     rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1998
1999     /* Collect measured throughputs for current and adjacent rates */
2000     window = tbl->tpc_win;
2001     sr = window[cur].success_ratio;
2002     current_tpt = window[cur].average_tpt;
2003     if (weak != TPC_INVALID)
2004         weak_tpt = window[weak].average_tpt;
2005     if (strong != TPC_INVALID)
2006         strong_tpt = window[strong].average_tpt;
2007
2008     IWL_DEBUG_RATE(mvm,
2009                "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2010                cur, current_tpt, sr, weak, strong,
2011                weak_tpt, strong_tpt);
2012
2013     action = rs_get_tpc_action(mvm, sr, weak, strong,
2014                    current_tpt, weak_tpt, strong_tpt);
2015
2016     /* override actions if we are on the edge */
2017     if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2018         IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2019         action = TPC_ACTION_STAY;
2020     } else if (strong == TPC_INVALID &&
2021            (action == TPC_ACTION_INCREASE ||
2022             action == TPC_ACTION_NO_RESTIRCTION)) {
2023         IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2024         action = TPC_ACTION_STAY;
2025     }
2026
2027     switch (action) {
2028     case TPC_ACTION_DECREASE:
2029         lq_sta->lq.reduced_tpc = weak;
2030         return true;
2031     case TPC_ACTION_INCREASE:
2032         lq_sta->lq.reduced_tpc = strong;
2033         return true;
2034     case TPC_ACTION_NO_RESTIRCTION:
2035         lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2036         return true;
2037     case TPC_ACTION_STAY:
2038         /* do nothing */
2039         break;
2040     }
2041     return false;
2042 }
2043
2044 /*
2045  * Do rate scaling and search for new modulation mode.
2046  */
2047 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2048                   struct ieee80211_sta *sta,
2049                   struct iwl_lq_sta *lq_sta,
2050                   int tid, bool ndp)
2051 {
2052     int low = IWL_RATE_INVALID;
2053     int high = IWL_RATE_INVALID;
2054     int index;
2055     struct iwl_rate_scale_data *window = NULL;
2056     int current_tpt = IWL_INVALID_VALUE;
2057     int low_tpt = IWL_INVALID_VALUE;
2058     int high_tpt = IWL_INVALID_VALUE;
2059     u32 fail_count;
2060     enum rs_action scale_action = RS_ACTION_STAY;
2061     u16 rate_mask;
2062     u8 update_lq = 0;
2063     struct iwl_scale_tbl_info *tbl, *tbl1;
2064     u8 active_tbl = 0;
2065     u8 done_search = 0;
2066     u16 high_low;
2067     s32 sr;
2068     u8 prev_agg = lq_sta->is_agg;
2069     struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2070     struct rs_rate *rate;
2071
2072     lq_sta->is_agg = !!mvmsta->agg_tids;
2073
2074     /*
2075      * Select rate-scale / modulation-mode table to work with in
2076      * the rest of this function:  "search" if searching for better
2077      * modulation mode, or "active" if doing rate scaling within a mode.
2078      */
2079     if (!lq_sta->search_better_tbl)
2080         active_tbl = lq_sta->active_tbl;
2081     else
2082         active_tbl = rs_search_tbl(lq_sta->active_tbl);
2083
2084     tbl = &(lq_sta->lq_info[active_tbl]);
2085     rate = &tbl->rate;
2086
2087     if (prev_agg != lq_sta->is_agg) {
2088         IWL_DEBUG_RATE(mvm,
2089                    "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2090                    prev_agg, lq_sta->is_agg);
2091         rs_set_expected_tpt_table(lq_sta, tbl);
2092         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2093     }
2094
2095     /* current tx rate */
2096     index = rate->index;
2097
2098     /* rates available for this association, and for modulation mode */
2099     rate_mask = rs_get_supported_rates(lq_sta, rate);
2100
2101     if (!(BIT(index) & rate_mask)) {
2102         IWL_ERR(mvm, "Current Rate is not valid\n");
2103         if (lq_sta->search_better_tbl) {
2104             /* revert to active table if search table is not valid*/
2105             rate->type = LQ_NONE;
2106             lq_sta->search_better_tbl = 0;
2107             tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2108             rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2109         }
2110         return;
2111     }
2112
2113     /* Get expected throughput table and history window for current rate */
2114     if (!tbl->expected_tpt) {
2115         IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2116         return;
2117     }
2118
2119     /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2120     window = &(tbl->win[index]);
2121
2122     /*
2123      * If there is not enough history to calculate actual average
2124      * throughput, keep analyzing results of more tx frames, without
2125      * changing rate or mode (bypass most of the rest of this function).
2126      * Set up new rate table in uCode only if old rate is not supported
2127      * in current association (use new rate found above).
2128      */
2129     fail_count = window->counter - window->success_counter;
2130     if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2131         (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2132         IWL_DEBUG_RATE(mvm,
2133                    "%s: Test Window: succ %d total %d\n",
2134                    rs_pretty_rate(rate),
2135                    window->success_counter, window->counter);
2136
2137         /* Can't calculate this yet; not enough history */
2138         window->average_tpt = IWL_INVALID_VALUE;
2139
2140         /* Should we stay with this modulation mode,
2141          * or search for a new one? */
2142         rs_stay_in_table(lq_sta, false);
2143
2144         return;
2145     }
2146
2147     /* If we are searching for better modulation mode, check success. */
2148     if (lq_sta->search_better_tbl) {
2149         /* If good success, continue using the "search" mode;
2150          * no need to send new link quality command, since we're
2151          * continuing to use the setup that we've been trying. */
2152         if (window->average_tpt > lq_sta->last_tpt) {
2153             IWL_DEBUG_RATE(mvm,
2154                        "SWITCHING TO NEW TABLE SR: %d "
2155                        "cur-tpt %d old-tpt %d\n",
2156                        window->success_ratio,
2157                        window->average_tpt,
2158                        lq_sta->last_tpt);
2159
2160             /* Swap tables; "search" becomes "active" */
2161             lq_sta->active_tbl = active_tbl;
2162             current_tpt = window->average_tpt;
2163         /* Else poor success; go back to mode in "active" table */
2164         } else {
2165             IWL_DEBUG_RATE(mvm,
2166                        "GOING BACK TO THE OLD TABLE: SR %d "
2167                        "cur-tpt %d old-tpt %d\n",
2168                        window->success_ratio,
2169                        window->average_tpt,
2170                        lq_sta->last_tpt);
2171
2172             /* Nullify "search" table */
2173             rate->type = LQ_NONE;
2174
2175             /* Revert to "active" table */
2176             active_tbl = lq_sta->active_tbl;
2177             tbl = &(lq_sta->lq_info[active_tbl]);
2178
2179             /* Revert to "active" rate and throughput info */
2180             index = tbl->rate.index;
2181             current_tpt = lq_sta->last_tpt;
2182
2183             /* Need to set up a new rate table in uCode */
2184             update_lq = 1;
2185         }
2186
2187         /* Either way, we've made a decision; modulation mode
2188          * search is done, allow rate adjustment next time. */
2189         lq_sta->search_better_tbl = 0;
2190         done_search = 1;    /* Don't switch modes below! */
2191         goto lq_update;
2192     }
2193
2194     /* (Else) not in search of better modulation mode, try for better
2195      * starting rate, while staying in this mode. */
2196     high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2197     low = high_low & 0xff;
2198     high = (high_low >> 8) & 0xff;
2199
2200     /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2201
2202     sr = window->success_ratio;
2203
2204     /* Collect measured throughputs for current and adjacent rates */
2205     current_tpt = window->average_tpt;
2206     if (low != IWL_RATE_INVALID)
2207         low_tpt = tbl->win[low].average_tpt;
2208     if (high != IWL_RATE_INVALID)
2209         high_tpt = tbl->win[high].average_tpt;
2210
2211     IWL_DEBUG_RATE(mvm,
2212                "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2213                rs_pretty_rate(rate), current_tpt, sr,
2214                low, high, low_tpt, high_tpt);
2215
2216     scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2217                       current_tpt, low_tpt, high_tpt);
2218
2219     /* Force a search in case BT doesn't like us being in MIMO */
2220     if (is_mimo(rate) &&
2221         !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2222         IWL_DEBUG_RATE(mvm,
2223                    "BT Coex forbids MIMO. Search for new config\n");
2224         rs_stay_in_table(lq_sta, true);
2225         goto lq_update;
2226     }
2227
2228     switch (scale_action) {
2229     case RS_ACTION_DOWNSCALE:
2230         /* Decrease starting rate, update uCode's rate table */
2231         if (low != IWL_RATE_INVALID) {
2232             update_lq = 1;
2233             index = low;
2234         } else {
2235             IWL_DEBUG_RATE(mvm,
2236                        "At the bottom rate. Can't decrease\n");
2237         }
2238
2239         break;
2240     case RS_ACTION_UPSCALE:
2241         /* Increase starting rate, update uCode's rate table */
2242         if (high != IWL_RATE_INVALID) {
2243             update_lq = 1;
2244             index = high;
2245         } else {
2246             IWL_DEBUG_RATE(mvm,
2247                        "At the top rate. Can't increase\n");
2248         }
2249
2250         break;
2251     case RS_ACTION_STAY:
2252         /* No change */
2253         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2254             update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2255         break;
2256     default:
2257         break;
2258     }
2259
2260 lq_update:
2261     /* Replace uCode's rate table for the destination station. */
2262     if (update_lq) {
2263         tbl->rate.index = index;
2264         if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2265             rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2266         rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2267         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2268     }
2269
2270     rs_stay_in_table(lq_sta, false);
2271
2272     /*
2273      * Search for new modulation mode if we're:
2274      * 1)  Not changing rates right now
2275      * 2)  Not just finishing up a search
2276      * 3)  Allowing a new search
2277      */
2278     if (!update_lq && !done_search &&
2279         lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2280         && window->counter) {
2281         enum rs_column next_column;
2282
2283         /* Save current throughput to compare with "search" throughput*/
2284         lq_sta->last_tpt = current_tpt;
2285
2286         IWL_DEBUG_RATE(mvm,
2287                    "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2288                    update_lq, done_search, lq_sta->rs_state,
2289                    window->counter);
2290
2291         next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2292         if (next_column != RS_COLUMN_INVALID) {
2293             int ret = rs_switch_to_column(mvm, lq_sta, sta,
2294                               next_column);
2295             if (!ret)
2296                 lq_sta->search_better_tbl = 1;
2297         } else {
2298             IWL_DEBUG_RATE(mvm,
2299                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2300             lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2301         }
2302
2303         /* If new "search" mode was selected, set up in uCode table */
2304         if (lq_sta->search_better_tbl) {
2305             /* Access the "search" table, clear its history. */
2306             tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
2307             rs_rate_scale_clear_tbl_windows(mvm, tbl);
2308
2309             /* Use new "search" start rate */
2310             index = tbl->rate.index;
2311
2312             rs_dump_rate(mvm, &tbl->rate,
2313                      "Switch to SEARCH TABLE:");
2314             rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2315         } else {
2316             done_search = 1;
2317         }
2318     }
2319
2320     if (!ndp)
2321         rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2322
2323     if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2324         tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2325         rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2326     }
2327 }
2328
2329 struct rs_init_rate_info {
2330     s8 rssi;
2331     u8 rate_idx;
2332 };
2333
2334 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2335     { -60, IWL_RATE_54M_INDEX },
2336     { -64, IWL_RATE_48M_INDEX },
2337     { -68, IWL_RATE_36M_INDEX },
2338     { -80, IWL_RATE_24M_INDEX },
2339     { -84, IWL_RATE_18M_INDEX },
2340     { -85, IWL_RATE_12M_INDEX },
2341     { -86, IWL_RATE_11M_INDEX },
2342     { -88, IWL_RATE_5M_INDEX  },
2343     { -90, IWL_RATE_2M_INDEX  },
2344     { S8_MIN, IWL_RATE_1M_INDEX },
2345 };
2346
2347 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2348     { -60, IWL_RATE_54M_INDEX },
2349     { -64, IWL_RATE_48M_INDEX },
2350     { -72, IWL_RATE_36M_INDEX },
2351     { -80, IWL_RATE_24M_INDEX },
2352     { -84, IWL_RATE_18M_INDEX },
2353     { -85, IWL_RATE_12M_INDEX },
2354     { -87, IWL_RATE_9M_INDEX  },
2355     { S8_MIN, IWL_RATE_6M_INDEX },
2356 };
2357
2358 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2359     { -60, IWL_RATE_MCS_7_INDEX },
2360     { -64, IWL_RATE_MCS_6_INDEX },
2361     { -68, IWL_RATE_MCS_5_INDEX },
2362     { -72, IWL_RATE_MCS_4_INDEX },
2363     { -80, IWL_RATE_MCS_3_INDEX },
2364     { -84, IWL_RATE_MCS_2_INDEX },
2365     { -85, IWL_RATE_MCS_1_INDEX },
2366     { S8_MIN, IWL_RATE_MCS_0_INDEX},
2367 };
2368
2369 /* MCS index 9 is not valid for 20MHz VHT channel width,
2370  * but is ok for 40, 80 and 160MHz channels.
2371  */
2372 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2373     { -60, IWL_RATE_MCS_8_INDEX },
2374     { -64, IWL_RATE_MCS_7_INDEX },
2375     { -68, IWL_RATE_MCS_6_INDEX },
2376     { -72, IWL_RATE_MCS_5_INDEX },
2377     { -80, IWL_RATE_MCS_4_INDEX },
2378     { -84, IWL_RATE_MCS_3_INDEX },
2379     { -85, IWL_RATE_MCS_2_INDEX },
2380     { -87, IWL_RATE_MCS_1_INDEX },
2381     { S8_MIN, IWL_RATE_MCS_0_INDEX},
2382 };
2383
2384 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2385     { -60, IWL_RATE_MCS_9_INDEX },
2386     { -64, IWL_RATE_MCS_8_INDEX },
2387     { -68, IWL_RATE_MCS_7_INDEX },
2388     { -72, IWL_RATE_MCS_6_INDEX },
2389     { -80, IWL_RATE_MCS_5_INDEX },
2390     { -84, IWL_RATE_MCS_4_INDEX },
2391     { -85, IWL_RATE_MCS_3_INDEX },
2392     { -87, IWL_RATE_MCS_2_INDEX },
2393     { -88, IWL_RATE_MCS_1_INDEX },
2394     { S8_MIN, IWL_RATE_MCS_0_INDEX },
2395 };
2396
2397 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2398
2399 /* Init the optimal rate based on STA caps
2400  * This combined with rssi is used to report the last tx rate
2401  * to userspace when we haven't transmitted enough frames.
2402  */
2403 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2404                  struct ieee80211_sta *sta,
2405                  struct iwl_lq_sta *lq_sta)
2406 {
2407     struct rs_rate *rate = &lq_sta->optimal_rate;
2408
2409     if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2410         rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2411     else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2412         rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2413     else if (lq_sta->band == NL80211_BAND_5GHZ)
2414         rate->type = LQ_LEGACY_A;
2415     else
2416         rate->type = LQ_LEGACY_G;
2417
2418     rate->bw = rs_bw_from_sta_bw(sta);
2419     rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2420
2421     /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2422
2423     if (is_mimo(rate)) {
2424         lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2425     } else if (is_siso(rate)) {
2426         lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2427     } else {
2428         lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2429
2430         if (lq_sta->band == NL80211_BAND_5GHZ) {
2431             lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2432             lq_sta->optimal_nentries =
2433                 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2434         } else {
2435             lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2436             lq_sta->optimal_nentries =
2437                 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2438         }
2439     }
2440
2441     if (is_vht(rate)) {
2442         if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2443             lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2444             lq_sta->optimal_nentries =
2445                 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2446         } else {
2447             lq_sta->optimal_rates = rs_optimal_rates_vht;
2448             lq_sta->optimal_nentries =
2449                 ARRAY_SIZE(rs_optimal_rates_vht);
2450         }
2451     } else if (is_ht(rate)) {
2452         lq_sta->optimal_rates = rs_optimal_rates_ht;
2453         lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2454     }
2455 }
2456
2457 /* Compute the optimal rate index based on RSSI */
2458 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2459                        struct iwl_lq_sta *lq_sta)
2460 {
2461     struct rs_rate *rate = &lq_sta->optimal_rate;
2462     int i;
2463
2464     rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2465                      BITS_PER_LONG);
2466
2467     for (i = 0; i < lq_sta->optimal_nentries; i++) {
2468         int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2469
2470         if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2471             (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2472             rate->index = rate_idx;
2473             break;
2474         }
2475     }
2476
2477     return rate;
2478 }
2479
2480 /* Choose an initial legacy rate and antenna to use based on the RSSI
2481  * of last Rx
2482  */
2483 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2484                 struct ieee80211_sta *sta,
2485                 struct iwl_lq_sta *lq_sta,
2486                 enum nl80211_band band,
2487                 struct rs_rate *rate)
2488 {
2489     struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2490     int i, nentries;
2491     unsigned long active_rate;
2492     s8 best_rssi = S8_MIN;
2493     u8 best_ant = ANT_NONE;
2494     u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2495     const struct rs_init_rate_info *initial_rates;
2496
2497     for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2498         if (!(lq_sta->pers.chains & BIT(i)))
2499             continue;
2500
2501         if (lq_sta->pers.chain_signal[i] > best_rssi) {
2502             best_rssi = lq_sta->pers.chain_signal[i];
2503             best_ant = BIT(i);
2504         }
2505     }
2506
2507     IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2508                iwl_rs_pretty_ant(best_ant), best_rssi);
2509
2510     if (best_ant != ANT_A && best_ant != ANT_B)
2511         rate->ant = first_antenna(valid_tx_ant);
2512     else
2513         rate->ant = best_ant;
2514
2515     rate->sgi = false;
2516     rate->ldpc = false;
2517     rate->bw = RATE_MCS_CHAN_WIDTH_20;
2518
2519     rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2520                      BITS_PER_LONG);
2521
2522     if (band == NL80211_BAND_5GHZ) {
2523         rate->type = LQ_LEGACY_A;
2524         initial_rates = rs_optimal_rates_5ghz_legacy;
2525         nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2526     } else {
2527         rate->type = LQ_LEGACY_G;
2528         initial_rates = rs_optimal_rates_24ghz_legacy;
2529         nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2530     }
2531
2532     if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2533         goto out;
2534
2535     /* Start from a higher rate if the corresponding debug capability
2536      * is enabled. The rate is chosen according to AP capabilities.
2537      * In case of VHT/HT when the rssi is low fallback to the case of
2538      * legacy rates.
2539      */
2540     if (sta->deflink.vht_cap.vht_supported &&
2541         best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2542         /*
2543          * In AP mode, when a new station associates, rs is initialized
2544          * immediately upon association completion, before the phy
2545          * context is updated with the association parameters, so the
2546          * sta bandwidth might be wider than the phy context allows.
2547          * To avoid this issue, always initialize rs with 20mhz
2548          * bandwidth rate, and after authorization, when the phy context
2549          * is already up-to-date, re-init rs with the correct bw.
2550          */
2551         u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ?
2552                 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2553
2554         switch (bw) {
2555         case RATE_MCS_CHAN_WIDTH_40:
2556         case RATE_MCS_CHAN_WIDTH_80:
2557         case RATE_MCS_CHAN_WIDTH_160:
2558             initial_rates = rs_optimal_rates_vht;
2559             nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2560             break;
2561         case RATE_MCS_CHAN_WIDTH_20:
2562             initial_rates = rs_optimal_rates_vht_20mhz;
2563             nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2564             break;
2565         default:
2566             IWL_ERR(mvm, "Invalid BW %d\n",
2567                 sta->deflink.bandwidth);
2568             goto out;
2569         }
2570
2571         active_rate = lq_sta->active_siso_rate;
2572         rate->type = LQ_VHT_SISO;
2573         rate->bw = bw;
2574     } else if (sta->deflink.ht_cap.ht_supported &&
2575            best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2576         initial_rates = rs_optimal_rates_ht;
2577         nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2578         active_rate = lq_sta->active_siso_rate;
2579         rate->type = LQ_HT_SISO;
2580     } else {
2581         active_rate = lq_sta->active_legacy_rate;
2582     }
2583
2584     for (i = 0; i < nentries; i++) {
2585         int rate_idx = initial_rates[i].rate_idx;
2586
2587         if ((best_rssi >= initial_rates[i].rssi) &&
2588             (BIT(rate_idx) & active_rate)) {
2589             rate->index = rate_idx;
2590             break;
2591         }
2592     }
2593
2594 out:
2595     rs_dump_rate(mvm, rate, "INITIAL");
2596 }
2597
2598 /* Save info about RSSI of last Rx */
2599 void rs_update_last_rssi(struct iwl_mvm *mvm,
2600              struct iwl_mvm_sta *mvmsta,
2601              struct ieee80211_rx_status *rx_status)
2602 {
2603     struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2604     int i;
2605
2606     lq_sta->pers.chains = rx_status->chains;
2607     lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2608     lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2609     lq_sta->pers.last_rssi = S8_MIN;
2610
2611     for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2612         if (!(lq_sta->pers.chains & BIT(i)))
2613             continue;
2614
2615         if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2616             lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2617     }
2618 }
2619
2620 /*
2621  * rs_initialize_lq - Initialize a station's hardware rate table
2622  *
2623  * The uCode's station table contains a table of fallback rates
2624  * for automatic fallback during transmission.
2625  *
2626  * NOTE: This sets up a default set of values.  These will be replaced later
2627  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2628  *       rc80211_simple.
2629  *
2630  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2631  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2632  *       which requires station table entry to exist).
2633  */
2634 static void rs_initialize_lq(struct iwl_mvm *mvm,
2635                  struct ieee80211_sta *sta,
2636                  struct iwl_lq_sta *lq_sta,
2637                  enum nl80211_band band)
2638 {
2639     struct iwl_scale_tbl_info *tbl;
2640     struct rs_rate *rate;
2641     u8 active_tbl = 0;
2642
2643     if (!sta || !lq_sta)
2644         return;
2645
2646     if (!lq_sta->search_better_tbl)
2647         active_tbl = lq_sta->active_tbl;
2648     else
2649         active_tbl = rs_search_tbl(lq_sta->active_tbl);
2650
2651     tbl = &(lq_sta->lq_info[active_tbl]);
2652     rate = &tbl->rate;
2653
2654     rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2655     rs_init_optimal_rate(mvm, sta, lq_sta);
2656
2657     WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2658           "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2659           rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2660           mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2661
2662     tbl->column = rs_get_column_from_rate(rate);
2663
2664     rs_set_expected_tpt_table(lq_sta, tbl);
2665     rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2666     /* TODO restore station should remember the lq cmd */
2667     iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
2668 }
2669
2670 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
2671                 void *mvm_sta,
2672                 struct ieee80211_tx_rate_control *txrc)
2673 {
2674     struct iwl_op_mode *op_mode = mvm_r;
2675     struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2676     struct sk_buff *skb = txrc->skb;
2677     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2678     struct iwl_lq_sta *lq_sta;
2679     struct rs_rate *optimal_rate;
2680     u32 last_ucode_rate;
2681
2682     if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2683         /* if vif isn't initialized mvm doesn't know about
2684          * this station, so don't do anything with the it
2685          */
2686         sta = NULL;
2687         mvm_sta = NULL;
2688     }
2689
2690     if (!mvm_sta)
2691         return;
2692
2693     lq_sta = mvm_sta;
2694     iwl_mvm_hwrate_to_tx_rate_v1(lq_sta->last_rate_n_flags,
2695                      info->band, &info->control.rates[0]);
2696     info->control.rates[0].count = 1;
2697
2698     /* Report the optimal rate based on rssi and STA caps if we haven't
2699      * converged yet (too little traffic) or exploring other modulations
2700      */
2701     if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2702         optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2703         last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2704                               optimal_rate);
2705         iwl_mvm_hwrate_to_tx_rate_v1(last_ucode_rate, info->band,
2706                          &txrc->reported_rate);
2707     }
2708 }
2709
2710 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2711                   gfp_t gfp)
2712 {
2713     struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2714     struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2715     struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2716     struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2717
2718     IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2719
2720     lq_sta->pers.drv = mvm;
2721 #ifdef CONFIG_MAC80211_DEBUGFS
2722     lq_sta->pers.dbg_fixed_rate = 0;
2723     lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2724     lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2725 #endif
2726     lq_sta->pers.chains = 0;
2727     memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2728     lq_sta->pers.last_rssi = S8_MIN;
2729
2730     return lq_sta;
2731 }
2732
2733 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2734                        int nss)
2735 {
2736     u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2737         (0x3 << (2 * (nss - 1)));
2738     rx_mcs >>= (2 * (nss - 1));
2739
2740     if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2741         return IWL_RATE_MCS_7_INDEX;
2742     else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2743         return IWL_RATE_MCS_8_INDEX;
2744     else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2745         return IWL_RATE_MCS_9_INDEX;
2746
2747     WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2748     return -1;
2749 }
2750
2751 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2752                      struct ieee80211_sta_vht_cap *vht_cap,
2753                      struct iwl_lq_sta *lq_sta)
2754 {
2755     int i;
2756     int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2757
2758     if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2759         for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2760             if (i == IWL_RATE_9M_INDEX)
2761                 continue;
2762
2763             /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2764             if (i == IWL_RATE_MCS_9_INDEX &&
2765                 sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20)
2766                 continue;
2767
2768             lq_sta->active_siso_rate |= BIT(i);
2769         }
2770     }
2771
2772     if (sta->deflink.rx_nss < 2)
2773         return;
2774
2775     highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2776     if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2777         for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2778             if (i == IWL_RATE_9M_INDEX)
2779                 continue;
2780
2781             /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2782             if (i == IWL_RATE_MCS_9_INDEX &&
2783                 sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20)
2784                 continue;
2785
2786             lq_sta->active_mimo2_rate |= BIT(i);
2787         }
2788     }
2789 }
2790
2791 static void rs_ht_init(struct iwl_mvm *mvm,
2792                struct ieee80211_sta *sta,
2793                struct iwl_lq_sta *lq_sta,
2794                struct ieee80211_sta_ht_cap *ht_cap)
2795 {
2796     /* active_siso_rate mask includes 9 MBits (bit 5),
2797      * and CCK (bits 0-3), supp_rates[] does not;
2798      * shift to convert format, force 9 MBits off.
2799      */
2800     lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2801     lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2802     lq_sta->active_siso_rate &= ~((u16)0x2);
2803     lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2804
2805     lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2806     lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2807     lq_sta->active_mimo2_rate &= ~((u16)0x2);
2808     lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2809
2810     if (mvm->cfg->ht_params->ldpc &&
2811         (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2812         lq_sta->ldpc = true;
2813
2814     if (mvm->cfg->ht_params->stbc &&
2815         (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2816         (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2817         lq_sta->stbc_capable = true;
2818
2819     lq_sta->is_vht = false;
2820 }
2821
2822 static void rs_vht_init(struct iwl_mvm *mvm,
2823             struct ieee80211_sta *sta,
2824             struct iwl_lq_sta *lq_sta,
2825             struct ieee80211_sta_vht_cap *vht_cap)
2826 {
2827     rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2828
2829     if (mvm->cfg->ht_params->ldpc &&
2830         (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2831         lq_sta->ldpc = true;
2832
2833     if (mvm->cfg->ht_params->stbc &&
2834         (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2835         (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2836         lq_sta->stbc_capable = true;
2837
2838     if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2839         (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2840         (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2841         lq_sta->bfer_capable = true;
2842
2843     lq_sta->is_vht = true;
2844 }
2845
2846 #ifdef CONFIG_IWLWIFI_DEBUGFS
2847 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2848 {
2849     spin_lock_bh(&mvm->drv_stats_lock);
2850     memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2851     spin_unlock_bh(&mvm->drv_stats_lock);
2852 }
2853
2854 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2855 {
2856     u8 nss = 0;
2857
2858     spin_lock(&mvm->drv_stats_lock);
2859
2860     if (agg)
2861         mvm->drv_rx_stats.agg_frames++;
2862
2863     mvm->drv_rx_stats.success_frames++;
2864
2865     switch (rate & RATE_MCS_CHAN_WIDTH_MSK_V1) {
2866     case RATE_MCS_CHAN_WIDTH_20:
2867         mvm->drv_rx_stats.bw_20_frames++;
2868         break;
2869     case RATE_MCS_CHAN_WIDTH_40:
2870         mvm->drv_rx_stats.bw_40_frames++;
2871         break;
2872     case RATE_MCS_CHAN_WIDTH_80:
2873         mvm->drv_rx_stats.bw_80_frames++;
2874         break;
2875     case RATE_MCS_CHAN_WIDTH_160:
2876         mvm->drv_rx_stats.bw_160_frames++;
2877         break;
2878     default:
2879         WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2880     }
2881
2882     if (rate & RATE_MCS_HT_MSK_V1) {
2883         mvm->drv_rx_stats.ht_frames++;
2884         nss = ((rate & RATE_HT_MCS_NSS_MSK_V1) >> RATE_HT_MCS_NSS_POS_V1) + 1;
2885     } else if (rate & RATE_MCS_VHT_MSK_V1) {
2886         mvm->drv_rx_stats.vht_frames++;
2887         nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2888                RATE_VHT_MCS_NSS_POS) + 1;
2889     } else {
2890         mvm->drv_rx_stats.legacy_frames++;
2891     }
2892
2893     if (nss == 1)
2894         mvm->drv_rx_stats.siso_frames++;
2895     else if (nss == 2)
2896         mvm->drv_rx_stats.mimo2_frames++;
2897
2898     if (rate & RATE_MCS_SGI_MSK_V1)
2899         mvm->drv_rx_stats.sgi_frames++;
2900     else
2901         mvm->drv_rx_stats.ngi_frames++;
2902
2903     mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2904     mvm->drv_rx_stats.last_frame_idx =
2905         (mvm->drv_rx_stats.last_frame_idx + 1) %
2906             ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2907
2908     spin_unlock(&mvm->drv_stats_lock);
2909 }
2910 #endif
2911
2912 /*
2913  * Called after adding a new station to initialize rate scaling
2914  */
2915 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2916                  enum nl80211_band band)
2917 {
2918     int i, j;
2919     struct ieee80211_hw *hw = mvm->hw;
2920     struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
2921     struct ieee80211_sta_vht_cap *vht_cap = &sta->deflink.vht_cap;
2922     struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2923     struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2924     struct ieee80211_supported_band *sband;
2925     unsigned long supp; /* must be unsigned long for for_each_set_bit */
2926
2927     lockdep_assert_held(&mvmsta->lq_sta.rs_drv.pers.lock);
2928
2929     /* clear all non-persistent lq data */
2930     memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2931
2932     sband = hw->wiphy->bands[band];
2933
2934     lq_sta->lq.sta_id = mvmsta->sta_id;
2935     mvmsta->amsdu_enabled = 0;
2936     mvmsta->max_amsdu_len = sta->max_amsdu_len;
2937
2938     for (j = 0; j < LQ_SIZE; j++)
2939         rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2940
2941     lq_sta->flush_timer = 0;
2942     lq_sta->last_tx = jiffies;
2943
2944     IWL_DEBUG_RATE(mvm,
2945                "LQ: *** rate scale station global init for station %d ***\n",
2946                mvmsta->sta_id);
2947     /* TODO: what is a good starting rate for STA? About middle? Maybe not
2948      * the lowest or the highest rate.. Could consider using RSSI from
2949      * previous packets? Need to have IEEE 802.1X auth succeed immediately
2950      * after assoc.. */
2951
2952     lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2953     lq_sta->band = sband->band;
2954     /*
2955      * active legacy rates as per supported rates bitmap
2956      */
2957     supp = sta->deflink.supp_rates[sband->band];
2958     lq_sta->active_legacy_rate = 0;
2959     for_each_set_bit(i, &supp, BITS_PER_LONG)
2960         lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2961
2962     /* TODO: should probably account for rx_highest for both HT/VHT */
2963     if (!vht_cap || !vht_cap->vht_supported)
2964         rs_ht_init(mvm, sta, lq_sta, ht_cap);
2965     else
2966         rs_vht_init(mvm, sta, lq_sta, vht_cap);
2967
2968     lq_sta->max_legacy_rate_idx =
2969         rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2970     lq_sta->max_siso_rate_idx =
2971         rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2972     lq_sta->max_mimo2_rate_idx =
2973         rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2974
2975     IWL_DEBUG_RATE(mvm,
2976                "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2977                lq_sta->active_legacy_rate,
2978                lq_sta->active_siso_rate,
2979                lq_sta->active_mimo2_rate,
2980                lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
2981                lq_sta->bfer_capable);
2982     IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2983                lq_sta->max_legacy_rate_idx,
2984                lq_sta->max_siso_rate_idx,
2985                lq_sta->max_mimo2_rate_idx);
2986
2987     /* These values will be overridden later */
2988     lq_sta->lq.single_stream_ant_msk =
2989         iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm));
2990     lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2991
2992     /* as default allow aggregation for all tids */
2993     lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2994     lq_sta->is_agg = 0;
2995 #ifdef CONFIG_IWLWIFI_DEBUGFS
2996     iwl_mvm_reset_frame_stats(mvm);
2997 #endif
2998     rs_initialize_lq(mvm, sta, lq_sta, band);
2999 }
3000
3001 static void rs_drv_rate_update(void *mvm_r,
3002                    struct ieee80211_supported_band *sband,
3003                    struct cfg80211_chan_def *chandef,
3004                    struct ieee80211_sta *sta,
3005                    void *priv_sta, u32 changed)
3006 {
3007     struct iwl_op_mode *op_mode = mvm_r;
3008     struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3009     u8 tid;
3010
3011     if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3012         return;
3013
3014     /* Stop any ongoing aggregations as rs starts off assuming no agg */
3015     for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3016         ieee80211_stop_tx_ba_session(sta, tid);
3017
3018     iwl_mvm_rs_rate_init(mvm, sta, sband->band, true);
3019 }
3020
3021 static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
3022                    struct ieee80211_sta *sta,
3023                    int tid, struct ieee80211_tx_info *info,
3024                    bool ndp)
3025 {
3026     int legacy_success;
3027     int retries;
3028     int i;
3029     struct iwl_lq_cmd *table;
3030     u32 lq_hwrate;
3031     struct rs_rate lq_rate, tx_resp_rate;
3032     struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
3033     u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
3034     u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
3035     u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
3036     u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
3037     struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3038     struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
3039
3040     if (!lq_sta->pers.drv) {
3041         IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
3042         return;
3043     }
3044
3045     /* This packet was aggregated but doesn't carry status info */
3046     if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
3047         !(info->flags & IEEE80211_TX_STAT_AMPDU))
3048         return;
3049
3050     if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
3051                     &tx_resp_rate)) {
3052         WARN_ON_ONCE(1);
3053         return;
3054     }
3055
3056 #ifdef CONFIG_MAC80211_DEBUGFS
3057     /* Disable last tx check if we are debugging with fixed rate but
3058      * update tx stats
3059      */
3060     if (lq_sta->pers.dbg_fixed_rate) {
3061         int index = tx_resp_rate.index;
3062         enum rs_column column;
3063         int attempts, success;
3064
3065         column = rs_get_column_from_rate(&tx_resp_rate);
3066         if (WARN_ONCE(column == RS_COLUMN_INVALID,
3067                   "Can't map rate 0x%x to column",
3068                   tx_resp_hwrate))
3069             return;
3070
3071         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3072             attempts = info->status.ampdu_len;
3073             success = info->status.ampdu_ack_len;
3074         } else {
3075             attempts = info->status.rates[0].count;
3076             success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3077         }
3078
3079         lq_sta->pers.tx_stats[column][index].total += attempts;
3080         lq_sta->pers.tx_stats[column][index].success += success;
3081
3082         IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
3083                    tx_resp_hwrate, success, attempts);
3084         return;
3085     }
3086 #endif
3087
3088     if (time_after(jiffies,
3089                (unsigned long)(lq_sta->last_tx +
3090                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
3091         IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
3092         /* reach here only in case of driver RS, call directly
3093          * the unlocked version
3094          */
3095         rs_drv_rate_init(mvm, sta, info->band);
3096         return;
3097     }
3098     lq_sta->last_tx = jiffies;
3099
3100     /* Ignore this Tx frame response if its initial rate doesn't match
3101      * that of latest Link Quality command.  There may be stragglers
3102      * from a previous Link Quality command, but we're no longer interested
3103      * in those; they're either from the "active" mode while we're trying
3104      * to check "search" mode, or a prior "search" mode after we've moved
3105      * to a new "search" mode (which might become the new "active" mode).
3106      */
3107     table = &lq_sta->lq;
3108     lq_hwrate = le32_to_cpu(table->rs_table[0]);
3109     if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
3110         WARN_ON_ONCE(1);
3111         return;
3112     }
3113
3114     /* Here we actually compare this rate to the latest LQ command */
3115     if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
3116         IWL_DEBUG_RATE(mvm,
3117                    "tx resp color 0x%x does not match 0x%x\n",
3118                    lq_color, LQ_FLAG_COLOR_GET(table->flags));
3119
3120         /* Since rates mis-match, the last LQ command may have failed.
3121          * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
3122          * ... driver.
3123          */
3124         lq_sta->missed_rate_counter++;
3125         if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
3126             lq_sta->missed_rate_counter = 0;
3127             IWL_DEBUG_RATE(mvm,
3128                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
3129                        lq_sta->rs_state);
3130             iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
3131         }
3132         /* Regardless, ignore this status info for outdated rate */
3133         return;
3134     }
3135
3136     /* Rate did match, so reset the missed_rate_counter */
3137     lq_sta->missed_rate_counter = 0;
3138
3139     if (!lq_sta->search_better_tbl) {
3140         curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3141         other_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3142     } else {
3143         curr_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3144         other_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3145     }
3146
3147     if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
3148         IWL_DEBUG_RATE(mvm,
3149                    "Neither active nor search matches tx rate\n");
3150         tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3151         rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
3152         tmp_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3153         rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
3154         rs_dump_rate(mvm, &lq_rate, "ACTUAL");
3155
3156         /* no matching table found, let's by-pass the data collection
3157          * and continue to perform rate scale to find the rate table
3158          */
3159         rs_stay_in_table(lq_sta, true);
3160         goto done;
3161     }
3162
3163     /* Updating the frame history depends on whether packets were
3164      * aggregated.
3165      *
3166      * For aggregation, all packets were transmitted at the same rate, the
3167      * first index into rate scale table.
3168      */
3169     if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3170         rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
3171                     info->status.ampdu_len,
3172                     info->status.ampdu_ack_len,
3173                     reduced_txp);
3174
3175         /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
3176          * it as a single frame loss as we don't want the success ratio
3177          * to dip too quickly because a BA wasn't received.
3178          * For TPC, there's no need for this optimisation since we want
3179          * to recover very quickly from a bad power reduction and,
3180          * therefore we'd like the success ratio to get an immediate hit
3181          * when failing to get a BA, so we'd switch back to a lower or
3182          * zero power reduction. When FW transmits agg with a rate
3183          * different from the initial rate, it will not use reduced txp
3184          * and will send BA notification twice (one empty with reduced
3185          * txp equal to the value from LQ and one with reduced txp 0).
3186          * We need to update counters for each txp level accordingly.
3187          */
3188         if (info->status.ampdu_ack_len == 0)
3189             info->status.ampdu_len = 1;
3190
3191         rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl,
3192                     tx_resp_rate.index,
3193                     info->status.ampdu_len,
3194                     info->status.ampdu_ack_len);
3195
3196         /* Update success/fail counts if not searching for new mode */
3197         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3198             lq_sta->total_success += info->status.ampdu_ack_len;
3199             lq_sta->total_failed += (info->status.ampdu_len -
3200                     info->status.ampdu_ack_len);
3201         }
3202     } else {
3203         /* For legacy, update frame history with for each Tx retry. */
3204         retries = info->status.rates[0].count - 1;
3205         /* HW doesn't send more than 15 retries */
3206         retries = min(retries, 15);
3207
3208         /* The last transmission may have been successful */
3209         legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3210         /* Collect data for each rate used during failed TX attempts */
3211         for (i = 0; i <= retries; ++i) {
3212             lq_hwrate = le32_to_cpu(table->rs_table[i]);
3213             if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
3214                             &lq_rate)) {
3215                 WARN_ON_ONCE(1);
3216                 return;
3217             }
3218
3219             /* Only collect stats if retried rate is in the same RS
3220              * table as active/search.
3221              */
3222             if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
3223                 tmp_tbl = curr_tbl;
3224             else if (rs_rate_column_match(&lq_rate,
3225                               &other_tbl->rate))
3226                 tmp_tbl = other_tbl;
3227             else
3228                 continue;
3229
3230             rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
3231                         tx_resp_rate.index, 1,
3232                         i < retries ? 0 : legacy_success,
3233                         reduced_txp);
3234             rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
3235                         tx_resp_rate.index, 1,
3236                         i < retries ? 0 : legacy_success);
3237         }
3238
3239         /* Update success/fail counts if not searching for new mode */
3240         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3241             lq_sta->total_success += legacy_success;
3242             lq_sta->total_failed += retries + (1 - legacy_success);
3243         }
3244     }
3245     /* The last TX rate is cached in lq_sta; it's set in if/else above */
3246     lq_sta->last_rate_n_flags = lq_hwrate;
3247     IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
3248 done:
3249     /* See if there's a better rate or modulation mode to try. */
3250     if (sta->deflink.supp_rates[info->band])
3251         rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
3252 }
3253
3254 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3255               int tid, struct ieee80211_tx_info *info, bool ndp)
3256 {
3257     struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3258
3259     /* If it's locked we are in middle of init flow
3260      * just wait for next tx status to update the lq_sta data
3261      */
3262     if (!spin_trylock(&mvmsta->lq_sta.rs_drv.pers.lock))
3263         return;
3264
3265     __iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp);
3266     spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock);
3267 }
3268
3269 #ifdef CONFIG_MAC80211_DEBUGFS
3270 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3271                         struct iwl_lq_cmd *lq_cmd,
3272                         enum nl80211_band band,
3273                         u32 ucode_rate)
3274 {
3275     struct rs_rate rate;
3276     int i;
3277     int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3278     __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3279     u8 ant = (ucode_rate & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS;
3280
3281     for (i = 0; i < num_rates; i++)
3282         lq_cmd->rs_table[i] = ucode_rate_le32;
3283
3284     if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3285         WARN_ON_ONCE(1);
3286         return;
3287     }
3288
3289     if (is_mimo(&rate))
3290         lq_cmd->mimo_delim = num_rates - 1;
3291     else
3292         lq_cmd->mimo_delim = 0;
3293
3294     lq_cmd->reduced_tpc = 0;
3295
3296     if (num_of_ant(ant) == 1)
3297         lq_cmd->single_stream_ant_msk = ant;
3298
3299     if (!mvm->trans->trans_cfg->gen2)
3300         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3301     else
3302         lq_cmd->agg_frame_cnt_limit =
3303             LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3304 }
3305 #endif /* CONFIG_MAC80211_DEBUGFS */
3306
3307 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3308                      struct iwl_lq_sta *lq_sta,
3309                      struct rs_rate *rate,
3310                      __le32 *rs_table, int *rs_table_index,
3311                      int num_rates, int num_retries,
3312                      u8 valid_tx_ant, bool toggle_ant)
3313 {
3314     int i, j;
3315     __le32 ucode_rate;
3316     bool bottom_reached = false;
3317     int prev_rate_idx = rate->index;
3318     int end = LINK_QUAL_MAX_RETRY_NUM;
3319     int index = *rs_table_index;
3320
3321     for (i = 0; i < num_rates && index < end; i++) {
3322         for (j = 0; j < num_retries && index < end; j++, index++) {
3323             ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3324                                      rate));
3325             rs_table[index] = ucode_rate;
3326             if (toggle_ant)
3327                 rs_toggle_antenna(valid_tx_ant, rate);
3328         }
3329
3330         prev_rate_idx = rate->index;
3331         bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3332         if (bottom_reached && !is_legacy(rate))
3333             break;
3334     }
3335
3336     if (!bottom_reached && !is_legacy(rate))
3337         rate->index = prev_rate_idx;
3338
3339     *rs_table_index = index;
3340 }
3341
3342 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3343  * column the rate table should look like this:
3344  *
3345  * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3346  * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3347  * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3348  * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3349  * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3350  * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3351  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3352  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3353  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3354  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3355  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3356  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3357  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3358  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3359  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3360  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3361  */
3362 static void rs_build_rates_table(struct iwl_mvm *mvm,
3363                  struct ieee80211_sta *sta,
3364                  struct iwl_lq_sta *lq_sta,
3365                  const struct rs_rate *initial_rate)
3366 {
3367     struct rs_rate rate;
3368     int num_rates, num_retries, index = 0;
3369     u8 valid_tx_ant = 0;
3370     struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3371     bool toggle_ant = false;
3372     u32 color;
3373
3374     memcpy(&rate, initial_rate, sizeof(rate));
3375
3376     valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3377
3378     /* TODO: remove old API when min FW API hits 14 */
3379     if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3380         rs_stbc_allow(mvm, sta, lq_sta))
3381         rate.stbc = true;
3382
3383     if (is_siso(&rate)) {
3384         num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3385         num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3386     } else if (is_mimo(&rate)) {
3387         num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3388         num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3389     } else {
3390         num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3391         num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3392         toggle_ant = true;
3393     }
3394
3395     rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3396                  num_rates, num_retries, valid_tx_ant,
3397                  toggle_ant);
3398
3399     rs_get_lower_rate_down_column(lq_sta, &rate);
3400
3401     if (is_siso(&rate)) {
3402         num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3403         num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3404         lq_cmd->mimo_delim = index;
3405     } else if (is_legacy(&rate)) {
3406         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3407         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3408     } else {
3409         WARN_ON_ONCE(1);
3410     }
3411
3412     toggle_ant = true;
3413
3414     rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3415                  num_rates, num_retries, valid_tx_ant,
3416                  toggle_ant);
3417
3418     rs_get_lower_rate_down_column(lq_sta, &rate);
3419
3420     num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3421     num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3422
3423     rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3424                  num_rates, num_retries, valid_tx_ant,
3425                  toggle_ant);
3426
3427     /* update the color of the LQ command (as a counter at bits 1-3) */
3428     color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3429     lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3430 }
3431
3432 struct rs_bfer_active_iter_data {
3433     struct ieee80211_sta *exclude_sta;
3434     struct iwl_mvm_sta *bfer_mvmsta;
3435 };
3436
3437 static void rs_bfer_active_iter(void *_data,
3438                 struct ieee80211_sta *sta)
3439 {
3440     struct rs_bfer_active_iter_data *data = _data;
3441     struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3442     struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq;
3443     u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3444
3445     if (sta == data->exclude_sta)
3446         return;
3447
3448     /* The current sta has BFER allowed */
3449     if (ss_params & LQ_SS_BFER_ALLOWED) {
3450         WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3451
3452         data->bfer_mvmsta = mvmsta;
3453     }
3454 }
3455
3456 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3457 {
3458     int prio = -1;
3459     enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3460
3461     switch (viftype) {
3462     case NL80211_IFTYPE_AP:
3463     case NL80211_IFTYPE_P2P_GO:
3464         prio = 3;
3465         break;
3466     case NL80211_IFTYPE_P2P_CLIENT:
3467         prio = 2;
3468         break;
3469     case NL80211_IFTYPE_STATION:
3470         prio = 1;
3471         break;
3472     default:
3473         WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3474         prio = -1;
3475     }
3476
3477     return prio;
3478 }
3479
3480 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3481 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3482                 struct iwl_mvm_sta *sta2)
3483 {
3484     int prio1 = rs_bfer_priority(sta1);
3485     int prio2 = rs_bfer_priority(sta2);
3486
3487     if (prio1 > prio2)
3488         return 1;
3489     if (prio1 < prio2)
3490         return -1;
3491     return 0;
3492 }
3493
3494 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3495                 struct ieee80211_sta *sta,
3496                 struct iwl_lq_sta *lq_sta,
3497                 const struct rs_rate *initial_rate)
3498 {
3499     struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3500     struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3501     struct rs_bfer_active_iter_data data = {
3502         .exclude_sta = sta,
3503         .bfer_mvmsta = NULL,
3504     };
3505     struct iwl_mvm_sta *bfer_mvmsta = NULL;
3506     u32 ss_params = LQ_SS_PARAMS_VALID;
3507
3508     if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3509         goto out;
3510
3511 #ifdef CONFIG_MAC80211_DEBUGFS
3512     /* Check if forcing the decision is configured.
3513      * Note that SISO is forced by not allowing STBC or BFER
3514      */
3515     if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3516         ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3517     else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3518         ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3519
3520     if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3521         IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3522                    lq_sta->pers.ss_force);
3523         goto out;
3524     }
3525 #endif
3526
3527     if (lq_sta->stbc_capable)
3528         ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3529
3530     if (!lq_sta->bfer_capable)
3531         goto out;
3532
3533     ieee80211_iterate_stations_atomic(mvm->hw,
3534                       rs_bfer_active_iter,
3535                       &data);
3536     bfer_mvmsta = data.bfer_mvmsta;
3537
3538     /* This code is safe as it doesn't run concurrently for different
3539      * stations. This is guaranteed by the fact that calls to
3540      * ieee80211_tx_status wouldn't run concurrently for a single HW.
3541      */
3542     if (!bfer_mvmsta) {
3543         IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3544
3545         ss_params |= LQ_SS_BFER_ALLOWED;
3546         goto out;
3547     }
3548
3549     IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3550                bfer_mvmsta->sta_id);
3551
3552     /* Disallow BFER on another STA if active and we're a higher priority */
3553     if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3554         struct iwl_lq_cmd *bfersta_lq_cmd =
3555             &bfer_mvmsta->lq_sta.rs_drv.lq;
3556         u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3557
3558         bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3559         bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3560         iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd);
3561
3562         ss_params |= LQ_SS_BFER_ALLOWED;
3563         IWL_DEBUG_RATE(mvm,
3564                    "Lower priority BFER sta found (%d). Switch BFER\n",
3565                    bfer_mvmsta->sta_id);
3566     }
3567 out:
3568     lq_cmd->ss_params = cpu_to_le32(ss_params);
3569 }
3570
3571 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3572                struct ieee80211_sta *sta,
3573                struct iwl_lq_sta *lq_sta,
3574                const struct rs_rate *initial_rate)
3575 {
3576     struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3577     struct iwl_mvm_sta *mvmsta;
3578     struct iwl_mvm_vif *mvmvif;
3579
3580     lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3581     lq_cmd->agg_time_limit =
3582         cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3583
3584 #ifdef CONFIG_MAC80211_DEBUGFS
3585     if (lq_sta->pers.dbg_fixed_rate) {
3586         rs_build_rates_table_from_fixed(mvm, lq_cmd,
3587                         lq_sta->band,
3588                         lq_sta->pers.dbg_fixed_rate);
3589         return;
3590     }
3591 #endif
3592     if (WARN_ON_ONCE(!sta || !initial_rate))
3593         return;
3594
3595     rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3596
3597     if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3598         rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3599
3600     mvmsta = iwl_mvm_sta_from_mac80211(sta);
3601     mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3602
3603     if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) &&
3604         num_of_ant(initial_rate->ant) == 1)
3605         lq_cmd->single_stream_ant_msk = initial_rate->ant;
3606
3607     lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3608
3609     /*
3610      * In case of low latency, tell the firmware to leave a frame in the
3611      * Tx Fifo so that it can start a transaction in the same TxOP. This
3612      * basically allows the firmware to send bursts.
3613      */
3614     if (iwl_mvm_vif_low_latency(mvmvif))
3615         lq_cmd->agg_frame_cnt_limit--;
3616
3617     if (mvmsta->vif->p2p)
3618         lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3619
3620     lq_cmd->agg_time_limit =
3621             cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3622 }
3623
3624 static void *rs_alloc(struct ieee80211_hw *hw)
3625 {
3626     return hw->priv;
3627 }
3628
3629 /* rate scale requires free function to be implemented */
3630 static void rs_free(void *mvm_rate)
3631 {
3632     return;
3633 }
3634
3635 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
3636 {
3637     struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3638     struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3639
3640     IWL_DEBUG_RATE(mvm, "enter\n");
3641     IWL_DEBUG_RATE(mvm, "leave\n");
3642 }
3643
3644 int rs_pretty_print_rate_v1(char *buf, int bufsz, const u32 rate)
3645 {
3646
3647     char *type;
3648     u8 mcs = 0, nss = 0;
3649     u8 ant = (rate & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS;
3650     u32 bw = (rate & RATE_MCS_CHAN_WIDTH_MSK_V1) >>
3651         RATE_MCS_CHAN_WIDTH_POS;
3652
3653     if (!(rate & RATE_MCS_HT_MSK_V1) &&
3654         !(rate & RATE_MCS_VHT_MSK_V1) &&
3655         !(rate & RATE_MCS_HE_MSK_V1)) {
3656         int index = iwl_hwrate_to_plcp_idx(rate);
3657
3658         return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps",
3659                  iwl_rs_pretty_ant(ant),
3660                  index == IWL_RATE_INVALID ? "BAD" :
3661                  iwl_rate_mcs(index)->mbps);
3662     }
3663
3664     if (rate & RATE_MCS_VHT_MSK_V1) {
3665         type = "VHT";
3666         mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3667         nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3668                >> RATE_VHT_MCS_NSS_POS) + 1;
3669     } else if (rate & RATE_MCS_HT_MSK_V1) {
3670         type = "HT";
3671         mcs = rate & RATE_HT_MCS_INDEX_MSK_V1;
3672         nss = ((rate & RATE_HT_MCS_NSS_MSK_V1)
3673                >> RATE_HT_MCS_NSS_POS_V1) + 1;
3674     } else if (rate & RATE_MCS_HE_MSK_V1) {
3675         type = "HE";
3676         mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3677         nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3678                >> RATE_VHT_MCS_NSS_POS) + 1;
3679     } else {
3680         type = "Unknown"; /* shouldn't happen */
3681     }
3682
3683     return scnprintf(buf, bufsz,
3684              "0x%x: %s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s",
3685              rate, type, iwl_rs_pretty_ant(ant), iwl_rs_pretty_bw(bw), mcs, nss,
3686              (rate & RATE_MCS_SGI_MSK_V1) ? "SGI " : "NGI ",
3687              (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3688              (rate & RATE_MCS_LDPC_MSK_V1) ? "LDPC " : "",
3689              (rate & RATE_HE_DUAL_CARRIER_MODE_MSK) ? "DCM " : "",
3690              (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3691 }
3692
3693 #ifdef CONFIG_MAC80211_DEBUGFS
3694 /*
3695  * Program the device to use fixed rate for frame transmit
3696  * This is for debugging/testing only
3697  * once the device start use fixed rate, we need to reload the module
3698  * to being back the normal operation.
3699  */
3700 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3701                 struct iwl_lq_sta *lq_sta)
3702 {
3703     lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3704     lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3705     lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3706
3707     IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3708                lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3709
3710     if (lq_sta->pers.dbg_fixed_rate) {
3711         rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3712         iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq);
3713     }
3714 }
3715
3716 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3717             const char __user *user_buf, size_t count, loff_t *ppos)
3718 {
3719     struct iwl_lq_sta *lq_sta = file->private_data;
3720     struct iwl_mvm *mvm;
3721     char buf[64];
3722     size_t buf_size;
3723     u32 parsed_rate;
3724
3725     mvm = lq_sta->pers.drv;
3726     memset(buf, 0, sizeof(buf));
3727     buf_size = min(count, sizeof(buf) -  1);
3728     if (copy_from_user(buf, user_buf, buf_size))
3729         return -EFAULT;
3730
3731     if (sscanf(buf, "%x", &parsed_rate) == 1)
3732         lq_sta->pers.dbg_fixed_rate = parsed_rate;
3733     else
3734         lq_sta->pers.dbg_fixed_rate = 0;
3735
3736     rs_program_fix_rate(mvm, lq_sta);
3737
3738     return count;
3739 }
3740
3741 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3742             char __user *user_buf, size_t count, loff_t *ppos)
3743 {
3744     char *buff;
3745     int desc = 0;
3746     int i = 0;
3747     ssize_t ret;
3748     static const size_t bufsz = 2048;
3749
3750     struct iwl_lq_sta *lq_sta = file->private_data;
3751     struct iwl_mvm_sta *mvmsta =
3752         container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
3753     struct iwl_mvm *mvm;
3754     struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3755     struct rs_rate *rate = &tbl->rate;
3756     u32 ss_params;
3757
3758     mvm = lq_sta->pers.drv;
3759     buff = kmalloc(bufsz, GFP_KERNEL);
3760     if (!buff)
3761         return -ENOMEM;
3762
3763     desc += scnprintf(buff + desc, bufsz - desc,
3764               "sta_id %d\n", lq_sta->lq.sta_id);
3765     desc += scnprintf(buff + desc, bufsz - desc,
3766               "failed=%d success=%d rate=0%lX\n",
3767               lq_sta->total_failed, lq_sta->total_success,
3768               lq_sta->active_legacy_rate);
3769     desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
3770               lq_sta->pers.dbg_fixed_rate);
3771     desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s\n",
3772         (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3773         (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "");
3774     desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
3775               (is_legacy(rate)) ? "legacy" :
3776               is_vht(rate) ? "VHT" : "HT");
3777     if (!is_legacy(rate)) {
3778         desc += scnprintf(buff + desc, bufsz - desc, " %s",
3779            (is_siso(rate)) ? "SISO" : "MIMO2");
3780         desc += scnprintf(buff + desc, bufsz - desc, " %s",
3781                 (is_ht20(rate)) ? "20MHz" :
3782                 (is_ht40(rate)) ? "40MHz" :
3783                 (is_ht80(rate)) ? "80MHz" :
3784                 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3785         desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
3786                 (rate->sgi) ? "SGI" : "NGI",
3787                 (rate->ldpc) ? "LDPC" : "BCC",
3788                 (lq_sta->is_agg) ? "AGG on" : "",
3789                 (mvmsta->amsdu_enabled) ? "AMSDU on" : "");
3790     }
3791     desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
3792             lq_sta->last_rate_n_flags);
3793     desc += scnprintf(buff + desc, bufsz - desc,
3794             "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3795             lq_sta->lq.flags,
3796             lq_sta->lq.mimo_delim,
3797             lq_sta->lq.single_stream_ant_msk,
3798             lq_sta->lq.dual_stream_ant_msk);
3799
3800     desc += scnprintf(buff + desc, bufsz - desc,
3801             "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3802             le16_to_cpu(lq_sta->lq.agg_time_limit),
3803             lq_sta->lq.agg_disable_start_th,
3804             lq_sta->lq.agg_frame_cnt_limit);
3805
3806     desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
3807               lq_sta->lq.reduced_tpc);
3808     ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3809     desc += scnprintf(buff + desc, bufsz - desc,
3810             "single stream params: %s%s%s%s\n",
3811             (ss_params & LQ_SS_PARAMS_VALID) ?
3812             "VALID" : "INVALID",
3813             (ss_params & LQ_SS_BFER_ALLOWED) ?
3814             ", BFER" : "",
3815             (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3816             ", STBC" : "",
3817             (ss_params & LQ_SS_FORCE) ?
3818             ", FORCE" : "");
3819     desc += scnprintf(buff + desc, bufsz - desc,
3820             "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3821             lq_sta->lq.initial_rate_index[0],
3822             lq_sta->lq.initial_rate_index[1],
3823             lq_sta->lq.initial_rate_index[2],
3824             lq_sta->lq.initial_rate_index[3]);
3825
3826     for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3827         u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3828
3829         desc += scnprintf(buff + desc, bufsz - desc,
3830                   " rate[%d] 0x%X ", i, r);
3831         desc += rs_pretty_print_rate_v1(buff + desc, bufsz - desc, r);
3832         if (desc < bufsz - 1)
3833             buff[desc++] = '\n';
3834     }
3835
3836     ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3837     kfree(buff);
3838     return ret;
3839 }
3840
3841 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3842     .write = rs_sta_dbgfs_scale_table_write,
3843     .read = rs_sta_dbgfs_scale_table_read,
3844     .open = simple_open,
3845     .llseek = default_llseek,
3846 };
3847 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3848             char __user *user_buf, size_t count, loff_t *ppos)
3849 {
3850     char *buff;
3851     int desc = 0;
3852     int i, j;
3853     ssize_t ret;
3854     struct iwl_scale_tbl_info *tbl;
3855     struct rs_rate *rate;
3856     struct iwl_lq_sta *lq_sta = file->private_data;
3857
3858     buff = kmalloc(1024, GFP_KERNEL);
3859     if (!buff)
3860         return -ENOMEM;
3861
3862     for (i = 0; i < LQ_SIZE; i++) {
3863         tbl = &(lq_sta->lq_info[i]);
3864         rate = &tbl->rate;
3865         desc += sprintf(buff+desc,
3866                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3867                 "index=%d\n",
3868                 lq_sta->active_tbl == i ? "*" : "x",
3869                 rate->type,
3870                 rate->sgi,
3871                 is_ht20(rate) ? "20MHz" :
3872                 is_ht40(rate) ? "40MHz" :
3873                 is_ht80(rate) ? "80MHz" :
3874                 is_ht160(rate) ? "160MHz" : "ERR",
3875                 rate->index);
3876         for (j = 0; j < IWL_RATE_COUNT; j++) {
3877             desc += sprintf(buff+desc,
3878                 "counter=%d success=%d %%=%d\n",
3879                 tbl->win[j].counter,
3880                 tbl->win[j].success_counter,
3881                 tbl->win[j].success_ratio);
3882         }
3883     }
3884     ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3885     kfree(buff);
3886     return ret;
3887 }
3888
3889 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3890     .read = rs_sta_dbgfs_stats_table_read,
3891     .open = simple_open,
3892     .llseek = default_llseek,
3893 };
3894
3895 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3896                           char __user *user_buf,
3897                           size_t count, loff_t *ppos)
3898 {
3899     static const char * const column_name[] = {
3900         [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3901         [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3902         [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3903         [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3904         [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3905         [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3906         [RS_COLUMN_MIMO2] = "MIMO2",
3907         [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3908     };
3909
3910     static const char * const rate_name[] = {
3911         [IWL_RATE_1M_INDEX] = "1M",
3912         [IWL_RATE_2M_INDEX] = "2M",
3913         [IWL_RATE_5M_INDEX] = "5.5M",
3914         [IWL_RATE_11M_INDEX] = "11M",
3915         [IWL_RATE_6M_INDEX] = "6M|MCS0",
3916         [IWL_RATE_9M_INDEX] = "9M",
3917         [IWL_RATE_12M_INDEX] = "12M|MCS1",
3918         [IWL_RATE_18M_INDEX] = "18M|MCS2",
3919         [IWL_RATE_24M_INDEX] = "24M|MCS3",
3920         [IWL_RATE_36M_INDEX] = "36M|MCS4",
3921         [IWL_RATE_48M_INDEX] = "48M|MCS5",
3922         [IWL_RATE_54M_INDEX] = "54M|MCS6",
3923         [IWL_RATE_MCS_7_INDEX] = "MCS7",
3924         [IWL_RATE_MCS_8_INDEX] = "MCS8",
3925         [IWL_RATE_MCS_9_INDEX] = "MCS9",
3926         [IWL_RATE_MCS_10_INDEX] = "MCS10",
3927         [IWL_RATE_MCS_11_INDEX] = "MCS11",
3928     };
3929
3930     char *buff, *pos, *endpos;
3931     int col, rate;
3932     ssize_t ret;
3933     struct iwl_lq_sta *lq_sta = file->private_data;
3934     struct rs_rate_stats *stats;
3935     static const size_t bufsz = 1024;
3936
3937     buff = kmalloc(bufsz, GFP_KERNEL);
3938     if (!buff)
3939         return -ENOMEM;
3940
3941     pos = buff;
3942     endpos = pos + bufsz;
3943
3944     pos += scnprintf(pos, endpos - pos, "COLUMN,");
3945     for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3946         pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3947     pos += scnprintf(pos, endpos - pos, "\n");
3948
3949     for (col = 0; col < RS_COLUMN_COUNT; col++) {
3950         pos += scnprintf(pos, endpos - pos,
3951                  "%s,", column_name[col]);
3952
3953         for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3954             stats = &(lq_sta->pers.tx_stats[col][rate]);
3955             pos += scnprintf(pos, endpos - pos,
3956                      "%llu/%llu,",
3957                      stats->success,
3958                      stats->total);
3959         }
3960         pos += scnprintf(pos, endpos - pos, "\n");
3961     }
3962
3963     ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3964     kfree(buff);
3965     return ret;
3966 }
3967
3968 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3969                            const char __user *user_buf,
3970                            size_t count, loff_t *ppos)
3971 {
3972     struct iwl_lq_sta *lq_sta = file->private_data;
3973     memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3974
3975     return count;
3976 }
3977
3978 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3979     .read = rs_sta_dbgfs_drv_tx_stats_read,
3980     .write = rs_sta_dbgfs_drv_tx_stats_write,
3981     .open = simple_open,
3982     .llseek = default_llseek,
3983 };
3984
3985 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3986                        char __user *user_buf,
3987                        size_t count, loff_t *ppos)
3988 {
3989     struct iwl_lq_sta *lq_sta = file->private_data;
3990     char buf[12];
3991     int bufsz = sizeof(buf);
3992     int pos = 0;
3993     static const char * const ss_force_name[] = {
3994         [RS_SS_FORCE_NONE] = "none",
3995         [RS_SS_FORCE_STBC] = "stbc",
3996         [RS_SS_FORCE_BFER] = "bfer",
3997         [RS_SS_FORCE_SISO] = "siso",
3998     };
3999
4000     pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
4001              ss_force_name[lq_sta->pers.ss_force]);
4002     return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
4003 }
4004
4005 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
4006                     size_t count, loff_t *ppos)
4007 {
4008     struct iwl_mvm *mvm = lq_sta->pers.drv;
4009     int ret = 0;
4010
4011     if (!strncmp("none", buf, 4)) {
4012         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
4013     } else if (!strncmp("siso", buf, 4)) {
4014         lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
4015     } else if (!strncmp("stbc", buf, 4)) {
4016         if (lq_sta->stbc_capable) {
4017             lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
4018         } else {
4019             IWL_ERR(mvm,
4020                 "can't force STBC. peer doesn't support\n");
4021             ret = -EINVAL;
4022         }
4023     } else if (!strncmp("bfer", buf, 4)) {
4024         if (lq_sta->bfer_capable) {
4025             lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4026         } else {
4027             IWL_ERR(mvm,
4028                 "can't force BFER. peer doesn't support\n");
4029             ret = -EINVAL;
4030         }
4031     } else {
4032         IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4033         ret = -EINVAL;
4034     }
4035     return ret ?: count;
4036 }
4037
4038 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4039     _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4040 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {        \
4041         debugfs_create_file(#name, mode, parent, lq_sta,    \
4042                     &iwl_dbgfs_##name##_ops);       \
4043     } while (0)
4044
4045 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4046
4047 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
4048                    struct dentry *dir)
4049 {
4050     struct iwl_lq_sta *lq_sta = priv_sta;
4051     struct iwl_mvm_sta *mvmsta;
4052
4053     mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
4054
4055     if (!mvmsta->vif)
4056         return;
4057
4058     debugfs_create_file("rate_scale_table", 0600, dir,
4059                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
4060     debugfs_create_file("rate_stats_table", 0400, dir,
4061                 lq_sta, &rs_sta_dbgfs_stats_table_ops);
4062     debugfs_create_file("drv_tx_stats", 0600, dir,
4063                 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4064     debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
4065               &lq_sta->tx_agg_tid_en);
4066     debugfs_create_u8("reduced_tpc", 0600, dir,
4067               &lq_sta->pers.dbg_fixed_txp_reduction);
4068
4069     MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
4070 }
4071 #endif
4072
4073 /*
4074  * Initialization of rate scaling information is done by driver after
4075  * the station is added. Since mac80211 calls this function before a
4076  * station is added we ignore it.
4077  */
4078 static void rs_rate_init_ops(void *mvm_r,
4079                  struct ieee80211_supported_band *sband,
4080                  struct cfg80211_chan_def *chandef,
4081                  struct ieee80211_sta *sta, void *mvm_sta)
4082 {
4083 }
4084
4085 /* ops for rate scaling implemented in the driver */
4086 static const struct rate_control_ops rs_mvm_ops_drv = {
4087     .name = RS_NAME,
4088     .tx_status = rs_drv_mac80211_tx_status,
4089     .get_rate = rs_drv_get_rate,
4090     .rate_init = rs_rate_init_ops,
4091     .alloc = rs_alloc,
4092     .free = rs_free,
4093     .alloc_sta = rs_drv_alloc_sta,
4094     .free_sta = rs_free_sta,
4095     .rate_update = rs_drv_rate_update,
4096 #ifdef CONFIG_MAC80211_DEBUGFS
4097     .add_sta_debugfs = rs_drv_add_sta_debugfs,
4098 #endif
4099     .capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW,
4100 };
4101
4102 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
4103               enum nl80211_band band, bool update)
4104 {
4105     if (iwl_mvm_has_tlc_offload(mvm)) {
4106         rs_fw_rate_init(mvm, sta, band, update);
4107     } else {
4108         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
4109
4110         spin_lock(&mvmsta->lq_sta.rs_drv.pers.lock);
4111         rs_drv_rate_init(mvm, sta, band);
4112         spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock);
4113     }
4114 }
4115
4116 int iwl_mvm_rate_control_register(void)
4117 {
4118     return ieee80211_rate_control_register(&rs_mvm_ops_drv);
4119 }
4120
4121 void iwl_mvm_rate_control_unregister(void)
4122 {
4123     ieee80211_rate_control_unregister(&rs_mvm_ops_drv);
4124 }
4125
4126 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4127                 bool enable)
4128 {
4129     struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq;
4130
4131     lockdep_assert_held(&mvm->mutex);
4132
4133     if (enable) {
4134         if (mvmsta->tx_protection == 0)
4135             lq->flags |= LQ_FLAG_USE_RTS_MSK;
4136         mvmsta->tx_protection++;
4137     } else {
4138         mvmsta->tx_protection--;
4139         if (mvmsta->tx_protection == 0)
4140             lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4141     }
4142
4143     return iwl_mvm_send_lq_cmd(mvm, lq);
4144 }
4145
4146 /**
4147  * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection
4148  * @mvm: The mvm component
4149  * @mvmsta: The station
4150  * @enable: Enable Tx protection?
4151  */
4152 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4153               bool enable)
4154 {
4155     if (iwl_mvm_has_tlc_offload(mvm))
4156         return rs_fw_tx_protection(mvm, mvmsta, enable);
4157     else
4158         return rs_drv_tx_protection(mvm, mvmsta, enable);
4159 }