drivers/net/wireless/intel/iwlwifi/dvm/rs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /******************************************************************************
   3  *
   4  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
   5  * Copyright (C) 2019 - 2020, 2022 - 2023 Intel Corporation
   6  *****************************************************************************/
   7 #include <linux/kernel.h>
   8 #include <linux/skbuff.h>
   9 #include <linux/slab.h>
  10 #include <net/mac80211.h>
  11
  12 #include <linux/netdevice.h>
  13 #include <linux/etherdevice.h>
  14 #include <linux/delay.h>
  15
  16 #include <linux/workqueue.h>
  17
  18 #include "dev.h"
  19 #include "agn.h"
  20
  21 #define RS_NAME "iwl-agn-rs"
  22
  23 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  24 #define IWL_NUMBER_TRY      1
  25 #define IWL_HT_NUMBER_TRY   3
  26
  27 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  28 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  29 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  30
  31 /* max allowed rate miss before sync LQ cmd */
  32 #define IWL_MISSED_RATE_MAX             15
  33 /* max time to accum history 2 seconds */
  34 #define IWL_RATE_SCALE_FLUSH_INTVL   (3*HZ)
  35
  36 static u8 rs_ht_to_legacy[] = {
  37         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  38         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  39         IWL_RATE_6M_INDEX,
  40         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  41         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  42         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  43         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  44 };
  45
  46 static const u8 ant_toggle_lookup[] = {
  47         /*ANT_NONE -> */ ANT_NONE,
  48         /*ANT_A    -> */ ANT_B,
  49         /*ANT_B    -> */ ANT_C,
  50         /*ANT_AB   -> */ ANT_BC,
  51         /*ANT_C    -> */ ANT_A,
  52         /*ANT_AC   -> */ ANT_AB,
  53         /*ANT_BC   -> */ ANT_AC,
  54         /*ANT_ABC  -> */ ANT_ABC,
  55 };
  56
  57 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
  58         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
  59                                     IWL_RATE_SISO_##s##M_PLCP, \
  60                                     IWL_RATE_MIMO2_##s##M_PLCP,\
  61                                     IWL_RATE_MIMO3_##s##M_PLCP,\
  62                                     IWL_RATE_##r##M_IEEE,      \
  63                                     IWL_RATE_##ip##M_INDEX,    \
  64                                     IWL_RATE_##in##M_INDEX,    \
  65                                     IWL_RATE_##rp##M_INDEX,    \
  66                                     IWL_RATE_##rn##M_INDEX,    \
  67                                     IWL_RATE_##pp##M_INDEX,    \
  68                                     IWL_RATE_##np##M_INDEX }
  69
  70 /*
  71  * Parameter order:
  72  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
  73  *
  74  * If there isn't a valid next or previous rate then INV is used which
  75  * maps to IWL_RATE_INVALID
  76  *
  77  */
  78 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
  79         IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),    /*  1mbps */
  80         IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
  81         IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
  82         IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
  83         IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
  84         IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
  85         IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
  86         IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
  87         IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
  88         IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
  89         IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
  90         IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
  91         IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
  92         /* FIXME:RS:          ^^    should be INV (legacy) */
  93 };
  94
  95 static inline u8 rs_extract_rate(u32 rate_n_flags)
  96 {
  97         return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
  98 }
  99
 100 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 101 {
 102         int idx = 0;
 103
 104         /* HT rate format */
 105         if (rate_n_flags & RATE_MCS_HT_MSK) {
 106                 idx = rs_extract_rate(rate_n_flags);
 107
 108                 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
 109                         idx = idx - IWL_RATE_MIMO3_6M_PLCP;
 110                 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
 111                         idx = idx - IWL_RATE_MIMO2_6M_PLCP;
 112
 113                 idx += IWL_FIRST_OFDM_RATE;
 114                 /* skip 9M not supported in ht*/
 115                 if (idx >= IWL_RATE_9M_INDEX)
 116                         idx += 1;
 117                 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
 118                         return idx;
 119
 120         /* legacy rate format, search for match in table */
 121         } else {
 122                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 123                         if (iwl_rates[idx].plcp ==
 124                                         rs_extract_rate(rate_n_flags))
 125                                 return idx;
 126         }
 127
 128         return IWL_RATE_INVALID;
 129 }
 130
 131 static void rs_rate_scale_perform(struct iwl_priv *priv,
 132                                    struct sk_buff *skb,
 133                                    struct ieee80211_sta *sta,
 134                                    struct iwl_lq_sta *lq_sta);
 135 static void rs_fill_link_cmd(struct iwl_priv *priv,
 136                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 137 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 138
 139
 140 #ifdef CONFIG_MAC80211_DEBUGFS
 141 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 142                              u32 *rate_n_flags, int index);
 143 #else
 144 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 145                              u32 *rate_n_flags, int index)
 146 {}
 147 #endif
 148
 149 /*
 150  * The following tables contain the expected throughput metrics for all rates
 151  *
 152  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 153  *
 154  * where invalid entries are zeros.
 155  *
 156  * CCK rates are only valid in legacy table and will only be used in G
 157  * (2.4 GHz) band.
 158  */
 159
 160 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 161         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 162 };
 163
 164 static const u16 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
 165         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202}, /* Norm */
 166         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210}, /* SGI */
 167         {0, 0, 0, 0, 47, 0,  91, 133, 171, 242, 305, 334, 362}, /* AGG */
 168         {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
 169 };
 170
 171 static const u16 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
 172         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 173         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 174         {0, 0, 0, 0,  94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
 175         {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
 176 };
 177
 178 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 179         {0, 0, 0, 0,  74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
 180         {0, 0, 0, 0,  81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
 181         {0, 0, 0, 0,  89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
 182         {0, 0, 0, 0,  97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
 183 };
 184
 185 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 186         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
 187         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
 188         {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
 189         {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
 190 };
 191
 192 static const u16 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
 193         {0, 0, 0, 0,  99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
 194         {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
 195         {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
 196         {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
 197 };
 198
 199 static const u16 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
 200         {0, 0, 0, 0, 152, 0, 211, 239, 255, 279,  290,  294,  297}, /* Norm */
 201         {0, 0, 0, 0, 160, 0, 219, 245, 261, 284,  294,  297,  300}, /* SGI */
 202         {0, 0, 0, 0, 254, 0, 443, 584, 695, 868,  984, 1030, 1070}, /* AGG */
 203         {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
 204 };
 205
 206 #define MCS_INDEX_PER_STREAM    (8)
 207
 208 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 209 {
 210         window->data = 0;
 211         window->success_counter = 0;
 212         window->success_ratio = IWL_INVALID_VALUE;
 213         window->counter = 0;
 214         window->average_tpt = IWL_INVALID_VALUE;
 215         window->stamp = 0;
 216 }
 217
 218 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 219 {
 220         return (ant_type & valid_antenna) == ant_type;
 221 }
 222
 223 /*
 224  *      removes the old data from the statistics. All data that is older than
 225  *      TID_MAX_TIME_DIFF, will be deleted.
 226  */
 227 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 228 {
 229         /* The oldest age we want to keep */
 230         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 231
 232         while (tl->queue_count &&
 233                (tl->time_stamp < oldest_time)) {
 234                 tl->total -= tl->packet_count[tl->head];
 235                 tl->packet_count[tl->head] = 0;
 236                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 237                 tl->queue_count--;
 238                 tl->head++;
 239                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 240                         tl->head = 0;
 241         }
 242 }
 243
 244 /*
 245  *      increment traffic load value for tid and also remove
 246  *      any old values if passed the certain time period
 247  */
 248 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 249                            struct ieee80211_hdr *hdr)
 250 {
 251         u32 curr_time = jiffies_to_msecs(jiffies);
 252         u32 time_diff;
 253         s32 index;
 254         struct iwl_traffic_load *tl = NULL;
 255         u8 tid;
 256
 257         if (ieee80211_is_data_qos(hdr->frame_control)) {
 258                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 259                 tid = qc[0] & 0xf;
 260         } else
 261                 return IWL_MAX_TID_COUNT;
 262
 263         if (unlikely(tid >= IWL_MAX_TID_COUNT))
 264                 return IWL_MAX_TID_COUNT;
 265
 266         tl = &lq_data->load[tid];
 267
 268         curr_time -= curr_time % TID_ROUND_VALUE;
 269
 270         /* Happens only for the first packet. Initialize the data */
 271         if (!(tl->queue_count)) {
 272                 tl->total = 1;
 273                 tl->time_stamp = curr_time;
 274                 tl->queue_count = 1;
 275                 tl->head = 0;
 276                 tl->packet_count[0] = 1;
 277                 return IWL_MAX_TID_COUNT;
 278         }
 279
 280         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 281         index = time_diff / TID_QUEUE_CELL_SPACING;
 282
 283         /* The history is too long: remove data that is older than */
 284         /* TID_MAX_TIME_DIFF */
 285         if (index >= TID_QUEUE_MAX_SIZE)
 286                 rs_tl_rm_old_stats(tl, curr_time);
 287
 288         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 289         tl->packet_count[index] = tl->packet_count[index] + 1;
 290         tl->total = tl->total + 1;
 291
 292         if ((index + 1) > tl->queue_count)
 293                 tl->queue_count = index + 1;
 294
 295         return tid;
 296 }
 297
 298 #ifdef CONFIG_MAC80211_DEBUGFS
 299 /*
 300  * Program the device to use fixed rate for frame transmit
 301  * This is for debugging/testing only
 302  * once the device start use fixed rate, we need to reload the module
 303  * to being back the normal operation.
 304  */
 305 static void rs_program_fix_rate(struct iwl_priv *priv,
 306                                 struct iwl_lq_sta *lq_sta)
 307 {
 308         struct iwl_station_priv *sta_priv =
 309                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
 310         struct iwl_rxon_context *ctx = sta_priv->ctx;
 311
 312         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
 313         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 314         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 315         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 316
 317         IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
 318                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
 319
 320         if (lq_sta->dbg_fixed_rate) {
 321                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
 322                 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
 323                                 false);
 324         }
 325 }
 326 #endif
 327
 328 /*
 329         get the traffic load value for tid
 330 */
 331 static void rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 332 {
 333         u32 curr_time = jiffies_to_msecs(jiffies);
 334         u32 time_diff;
 335         s32 index;
 336         struct iwl_traffic_load *tl = NULL;
 337
 338         if (tid >= IWL_MAX_TID_COUNT)
 339                 return;
 340
 341         tl = &(lq_data->load[tid]);
 342
 343         curr_time -= curr_time % TID_ROUND_VALUE;
 344
 345         if (!(tl->queue_count))
 346                 return;
 347
 348         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 349         index = time_diff / TID_QUEUE_CELL_SPACING;
 350
 351         /* The history is too long: remove data that is older than */
 352         /* TID_MAX_TIME_DIFF */
 353         if (index >= TID_QUEUE_MAX_SIZE)
 354                 rs_tl_rm_old_stats(tl, curr_time);
 355 }
 356
 357 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 358                                       struct iwl_lq_sta *lq_data, u8 tid,
 359                                       struct ieee80211_sta *sta)
 360 {
 361         int ret = -EAGAIN;
 362
 363         /*
 364          * Don't create TX aggregation sessions when in high
 365          * BT traffic, as they would just be disrupted by BT.
 366          */
 367         if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
 368                 IWL_DEBUG_COEX(priv,
 369                                "BT traffic (%d), no aggregation allowed\n",
 370                                priv->bt_traffic_load);
 371                 return ret;
 372         }
 373
 374         rs_tl_get_load(lq_data, tid);
 375
 376         IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
 377                         sta->addr, tid);
 378         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 379         if (ret == -EAGAIN) {
 380                 /*
 381                  * driver and mac80211 is out of sync
 382                  * this might be cause by reloading firmware
 383                  * stop the tx ba session here
 384                  */
 385                 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
 386                         tid);
 387                 ieee80211_stop_tx_ba_session(sta, tid);
 388         }
 389         return ret;
 390 }
 391
 392 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 393                               struct iwl_lq_sta *lq_data,
 394                               struct ieee80211_sta *sta)
 395 {
 396         if (tid < IWL_MAX_TID_COUNT)
 397                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 398         else
 399                 IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n",
 400                         tid, IWL_MAX_TID_COUNT);
 401 }
 402
 403 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 404 {
 405         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 406                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 407                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 408 }
 409
 410 /*
 411  * Static function to get the expected throughput from an iwl_scale_tbl_info
 412  * that wraps a NULL pointer check
 413  */
 414 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 415 {
 416         if (tbl->expected_tpt)
 417                 return tbl->expected_tpt[rs_index];
 418         return 0;
 419 }
 420
 421 /*
 422  * rs_collect_tx_data - Update the success/failure sliding window
 423  *
 424  * We keep a sliding window of the last 62 packets transmitted
 425  * at this rate.  window->data contains the bitmask of successful
 426  * packets.
 427  */
 428 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 429                               int scale_index, int attempts, int successes)
 430 {
 431         struct iwl_rate_scale_data *window = NULL;
 432         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 433         s32 fail_count, tpt;
 434
 435         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 436                 return -EINVAL;
 437
 438         /* Select window for current tx bit rate */
 439         window = &(tbl->win[scale_index]);
 440
 441         /* Get expected throughput */
 442         tpt = get_expected_tpt(tbl, scale_index);
 443
 444         /*
 445          * Keep track of only the latest 62 tx frame attempts in this rate's
 446          * history window; anything older isn't really relevant any more.
 447          * If we have filled up the sliding window, drop the oldest attempt;
 448          * if the oldest attempt (highest bit in bitmap) shows "success",
 449          * subtract "1" from the success counter (this is the main reason
 450          * we keep these bitmaps!).
 451          */
 452         while (attempts > 0) {
 453                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 454
 455                         /* remove earliest */
 456                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 457
 458                         if (window->data & mask) {
 459                                 window->data &= ~mask;
 460                                 window->success_counter--;
 461                         }
 462                 }
 463
 464                 /* Increment frames-attempted counter */
 465                 window->counter++;
 466
 467                 /* Shift bitmap by one frame to throw away oldest history */
 468                 window->data <<= 1;
 469
 470                 /* Mark the most recent #successes attempts as successful */
 471                 if (successes > 0) {
 472                         window->success_counter++;
 473                         window->data |= 0x1;
 474                         successes--;
 475                 }
 476
 477                 attempts--;
 478         }
 479
 480         /* Calculate current success ratio, avoid divide-by-0! */
 481         if (window->counter > 0)
 482                 window->success_ratio = 128 * (100 * window->success_counter)
 483                                         / window->counter;
 484         else
 485                 window->success_ratio = IWL_INVALID_VALUE;
 486
 487         fail_count = window->counter - window->success_counter;
 488
 489         /* Calculate average throughput, if we have enough history. */
 490         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 491             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 492                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 493         else
 494                 window->average_tpt = IWL_INVALID_VALUE;
 495
 496         /* Tag this window as having been updated */
 497         window->stamp = jiffies;
 498
 499         return 0;
 500 }
 501
 502 /*
 503  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 504  */
 505 /* FIXME:RS:remove this function and put the flags statically in the table */
 506 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
 507                                  struct iwl_scale_tbl_info *tbl,
 508                                  int index, u8 use_green)
 509 {
 510         u32 rate_n_flags = 0;
 511
 512         if (is_legacy(tbl->lq_type)) {
 513                 rate_n_flags = iwl_rates[index].plcp;
 514                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 515                         rate_n_flags |= RATE_MCS_CCK_MSK;
 516
 517         } else if (is_Ht(tbl->lq_type)) {
 518                 if (index > IWL_LAST_OFDM_RATE) {
 519                         IWL_ERR(priv, "Invalid HT rate index %d\n", index);
 520                         index = IWL_LAST_OFDM_RATE;
 521                 }
 522                 rate_n_flags = RATE_MCS_HT_MSK;
 523
 524                 if (is_siso(tbl->lq_type))
 525                         rate_n_flags |= iwl_rates[index].plcp_siso;
 526                 else if (is_mimo2(tbl->lq_type))
 527                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 528                 else
 529                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 530         } else {
 531                 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 532         }
 533
 534         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 535                                                      RATE_MCS_ANT_ABC_MSK);
 536
 537         if (is_Ht(tbl->lq_type)) {
 538                 if (tbl->is_ht40) {
 539                         if (tbl->is_dup)
 540                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 541                         else
 542                                 rate_n_flags |= RATE_MCS_HT40_MSK;
 543                 }
 544                 if (tbl->is_SGI)
 545                         rate_n_flags |= RATE_MCS_SGI_MSK;
 546
 547                 if (use_green) {
 548                         rate_n_flags |= RATE_MCS_GF_MSK;
 549                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 550                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 551                                 IWL_ERR(priv, "GF was set with SGI:SISO\n");
 552                         }
 553                 }
 554         }
 555         return rate_n_flags;
 556 }
 557
 558 /*
 559  * Interpret uCode API's rate_n_flags format,
 560  * fill "search" or "active" tx mode table.
 561  */
 562 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 563                                     enum nl80211_band band,
 564                                     struct iwl_scale_tbl_info *tbl,
 565                                     int *rate_idx)
 566 {
 567         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 568         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 569         u8 mcs;
 570
 571         memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
 572         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 573
 574         if (*rate_idx  == IWL_RATE_INVALID) {
 575                 *rate_idx = -1;
 576                 return -EINVAL;
 577         }
 578         tbl->is_SGI = 0;        /* default legacy setup */
 579         tbl->is_ht40 = 0;
 580         tbl->is_dup = 0;
 581         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 582         tbl->lq_type = LQ_NONE;
 583         tbl->max_search = IWL_MAX_SEARCH;
 584
 585         /* legacy rate format */
 586         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 587                 if (num_of_ant == 1) {
 588                         if (band == NL80211_BAND_5GHZ)
 589                                 tbl->lq_type = LQ_A;
 590                         else
 591                                 tbl->lq_type = LQ_G;
 592                 }
 593         /* HT rate format */
 594         } else {
 595                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 596                         tbl->is_SGI = 1;
 597
 598                 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
 599                     (rate_n_flags & RATE_MCS_DUP_MSK))
 600                         tbl->is_ht40 = 1;
 601
 602                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 603                         tbl->is_dup = 1;
 604
 605                 mcs = rs_extract_rate(rate_n_flags);
 606
 607                 /* SISO */
 608                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 609                         if (num_of_ant == 1)
 610                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 611                 /* MIMO2 */
 612                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 613                         if (num_of_ant == 2)
 614                                 tbl->lq_type = LQ_MIMO2;
 615                 /* MIMO3 */
 616                 } else {
 617                         if (num_of_ant == 3) {
 618                                 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
 619                                 tbl->lq_type = LQ_MIMO3;
 620                         }
 621                 }
 622         }
 623         return 0;
 624 }
 625
 626 /* switch to another antenna/antennas and return 1 */
 627 /* if no other valid antenna found, return 0 */
 628 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 629                              struct iwl_scale_tbl_info *tbl)
 630 {
 631         u8 new_ant_type;
 632
 633         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 634                 return 0;
 635
 636         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 637                 return 0;
 638
 639         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 640
 641         while ((new_ant_type != tbl->ant_type) &&
 642                !rs_is_valid_ant(valid_ant, new_ant_type))
 643                 new_ant_type = ant_toggle_lookup[new_ant_type];
 644
 645         if (new_ant_type == tbl->ant_type)
 646                 return 0;
 647
 648         tbl->ant_type = new_ant_type;
 649         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 650         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 651         return 1;
 652 }
 653
 654 /*
 655  * Green-field mode is valid if the station supports it and
 656  * there are no non-GF stations present in the BSS.
 657  */
 658 static bool rs_use_green(struct ieee80211_sta *sta)
 659 {
 660         /*
 661          * There's a bug somewhere in this code that causes the
 662          * scaling to get stuck because GF+SGI can't be combined
 663          * in SISO rates. Until we find that bug, disable GF, it
 664          * has only limited benefit and we still interoperate with
 665          * GF APs since we can always receive GF transmissions.
 666          */
 667         return false;
 668 }
 669
 670 /*
 671  * rs_get_supported_rates - get the available rates
 672  *
 673  * if management frame or broadcast frame only return
 674  * basic available rates.
 675  *
 676  */
 677 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 678                                   struct ieee80211_hdr *hdr,
 679                                   enum iwl_table_type rate_type)
 680 {
 681         if (is_legacy(rate_type)) {
 682                 return lq_sta->active_legacy_rate;
 683         } else {
 684                 if (is_siso(rate_type))
 685                         return lq_sta->active_siso_rate;
 686                 else if (is_mimo2(rate_type))
 687                         return lq_sta->active_mimo2_rate;
 688                 else
 689                         return lq_sta->active_mimo3_rate;
 690         }
 691 }
 692
 693 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 694                                 int rate_type)
 695 {
 696         u8 high = IWL_RATE_INVALID;
 697         u8 low = IWL_RATE_INVALID;
 698
 699         /* 802.11A or ht walks to the next literal adjacent rate in
 700          * the rate table */
 701         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 702                 int i;
 703                 u32 mask;
 704
 705                 /* Find the previous rate that is in the rate mask */
 706                 i = index - 1;
 707                 if (i >= 0)
 708                         mask = BIT(i);
 709
 710                 for (; i >= 0; i--, mask >>= 1) {
 711                         if (rate_mask & mask) {
 712                                 low = i;
 713                                 break;
 714                         }
 715                 }
 716
 717                 /* Find the next rate that is in the rate mask */
 718                 i = index + 1;
 719                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 720                         if (rate_mask & mask) {
 721                                 high = i;
 722                                 break;
 723                         }
 724                 }
 725
 726                 return (high << 8) | low;
 727         }
 728
 729         low = index;
 730         while (low != IWL_RATE_INVALID) {
 731                 low = iwl_rates[low].prev_rs;
 732                 if (low == IWL_RATE_INVALID)
 733                         break;
 734                 if (rate_mask & (1 << low))
 735                         break;
 736                 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
 737         }
 738
 739         high = index;
 740         while (high != IWL_RATE_INVALID) {
 741                 high = iwl_rates[high].next_rs;
 742                 if (high == IWL_RATE_INVALID)
 743                         break;
 744                 if (rate_mask & (1 << high))
 745                         break;
 746                 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
 747         }
 748
 749         return (high << 8) | low;
 750 }
 751
 752 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 753                              struct iwl_scale_tbl_info *tbl,
 754                              u8 scale_index, u8 ht_possible)
 755 {
 756         s32 low;
 757         u16 rate_mask;
 758         u16 high_low;
 759         u8 switch_to_legacy = 0;
 760         u8 is_green = lq_sta->is_green;
 761         struct iwl_priv *priv = lq_sta->drv;
 762
 763         /* check if we need to switch from HT to legacy rates.
 764          * assumption is that mandatory rates (1Mbps or 6Mbps)
 765          * are always supported (spec demand) */
 766         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 767                 switch_to_legacy = 1;
 768                 scale_index = rs_ht_to_legacy[scale_index];
 769                 if (lq_sta->band == NL80211_BAND_5GHZ)
 770                         tbl->lq_type = LQ_A;
 771                 else
 772                         tbl->lq_type = LQ_G;
 773
 774                 if (num_of_ant(tbl->ant_type) > 1)
 775                         tbl->ant_type =
 776                             first_antenna(priv->nvm_data->valid_tx_ant);
 777
 778                 tbl->is_ht40 = 0;
 779                 tbl->is_SGI = 0;
 780                 tbl->max_search = IWL_MAX_SEARCH;
 781         }
 782
 783         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 784
 785         /* Mask with station rate restriction */
 786         if (is_legacy(tbl->lq_type)) {
 787                 /* supp_rates has no CCK bits in A mode */
 788                 if (lq_sta->band == NL80211_BAND_5GHZ)
 789                         rate_mask  = (u16)(rate_mask &
 790                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 791                 else
 792                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 793         }
 794
 795         /* If we switched from HT to legacy, check current rate */
 796         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 797                 low = scale_index;
 798                 goto out;
 799         }
 800
 801         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 802                                         tbl->lq_type);
 803         low = high_low & 0xff;
 804
 805         if (low == IWL_RATE_INVALID)
 806                 low = scale_index;
 807
 808 out:
 809         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 810 }
 811
 812 /*
 813  * Simple function to compare two rate scale table types
 814  */
 815 static bool table_type_matches(struct iwl_scale_tbl_info *a,
 816                                struct iwl_scale_tbl_info *b)
 817 {
 818         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 819                 (a->is_SGI == b->is_SGI);
 820 }
 821
 822 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 823                             struct iwl_lq_sta *lq_sta)
 824 {
 825         struct iwl_scale_tbl_info *tbl;
 826         bool full_concurrent = priv->bt_full_concurrent;
 827
 828         if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
 829             (priv->bt_full_concurrent != full_concurrent)) {
 830                 priv->bt_full_concurrent = full_concurrent;
 831                 priv->last_bt_traffic_load = priv->bt_traffic_load;
 832
 833                 /* Update uCode's rate table. */
 834                 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 835                 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
 836                 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 837
 838                 queue_work(priv->workqueue, &priv->bt_full_concurrency);
 839         }
 840 }
 841
 842 /*
 843  * mac80211 sends us Tx status
 844  */
 845 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 846                          struct ieee80211_sta *sta, void *priv_sta,
 847                          struct sk_buff *skb)
 848 {
 849         int legacy_success;
 850         int retries;
 851         int rs_index, mac_index, i;
 852         struct iwl_lq_sta *lq_sta = priv_sta;
 853         struct iwl_link_quality_cmd *table;
 854         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 855         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r;
 856         struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
 857         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 858         enum mac80211_rate_control_flags mac_flags;
 859         u32 tx_rate;
 860         struct iwl_scale_tbl_info tbl_type;
 861         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 862         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 863         struct iwl_rxon_context *ctx = sta_priv->ctx;
 864
 865         IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
 866
 867         /* Treat uninitialized rate scaling data same as non-existing. */
 868         if (!lq_sta) {
 869                 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
 870                 return;
 871         } else if (!lq_sta->drv) {
 872                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
 873                 return;
 874         }
 875
 876         if (!ieee80211_is_data(hdr->frame_control) ||
 877             info->flags & IEEE80211_TX_CTL_NO_ACK)
 878                 return;
 879
 880         /* This packet was aggregated but doesn't carry status info */
 881         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 882             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 883                 return;
 884
 885         /*
 886          * Ignore this Tx frame response if its initial rate doesn't match
 887          * that of latest Link Quality command.  There may be stragglers
 888          * from a previous Link Quality command, but we're no longer interested
 889          * in those; they're either from the "active" mode while we're trying
 890          * to check "search" mode, or a prior "search" mode after we've moved
 891          * to a new "search" mode (which might become the new "active" mode).
 892          */
 893         table = &lq_sta->lq;
 894         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 895         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 896         if (priv->band == NL80211_BAND_5GHZ)
 897                 rs_index -= IWL_FIRST_OFDM_RATE;
 898         mac_flags = info->status.rates[0].flags;
 899         mac_index = info->status.rates[0].idx;
 900         /* For HT packets, map MCS to PLCP */
 901         if (mac_flags & IEEE80211_TX_RC_MCS) {
 902                 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
 903                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 904                         mac_index++;
 905                 /*
 906                  * mac80211 HT index is always zero-indexed; we need to move
 907                  * HT OFDM rates after CCK rates in 2.4 GHz band
 908                  */
 909                 if (priv->band == NL80211_BAND_2GHZ)
 910                         mac_index += IWL_FIRST_OFDM_RATE;
 911         }
 912         /* Here we actually compare this rate to the latest LQ command */
 913         if ((mac_index < 0) ||
 914             (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 915             (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 916             (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
 917             (tbl_type.ant_type != info->status.antenna) ||
 918             (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 919             (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 920             (rs_index != mac_index)) {
 921                 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
 922                 /*
 923                  * Since rates mis-match, the last LQ command may have failed.
 924                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 925                  * ... driver.
 926                  */
 927                 lq_sta->missed_rate_counter++;
 928                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 929                         lq_sta->missed_rate_counter = 0;
 930                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 931                 }
 932                 /* Regardless, ignore this status info for outdated rate */
 933                 return;
 934         } else
 935                 /* Rate did match, so reset the missed_rate_counter */
 936                 lq_sta->missed_rate_counter = 0;
 937
 938         /* Figure out if rate scale algorithm is in active or search table */
 939         if (table_type_matches(&tbl_type,
 940                                 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 941                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 942                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 943         } else if (table_type_matches(&tbl_type,
 944                                 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
 945                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 946                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 947         } else {
 948                 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
 949                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 950                 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
 951                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
 952                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 953                 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
 954                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
 955                 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
 956                         tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
 957                 /*
 958                  * no matching table found, let's by-pass the data collection
 959                  * and continue to perform rate scale to find the rate table
 960                  */
 961                 rs_stay_in_table(lq_sta, true);
 962                 goto done;
 963         }
 964
 965         /*
 966          * Updating the frame history depends on whether packets were
 967          * aggregated.
 968          *
 969          * For aggregation, all packets were transmitted at the same rate, the
 970          * first index into rate scale table.
 971          */
 972         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
 973                 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 974                 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
 975                                 &rs_index);
 976                 rs_collect_tx_data(curr_tbl, rs_index,
 977                                    info->status.ampdu_len,
 978                                    info->status.ampdu_ack_len);
 979
 980                 /* Update success/fail counts if not searching for new mode */
 981                 if (lq_sta->stay_in_tbl) {
 982                         lq_sta->total_success += info->status.ampdu_ack_len;
 983                         lq_sta->total_failed += (info->status.ampdu_len -
 984                                         info->status.ampdu_ack_len);
 985                 }
 986         } else {
 987         /*
 988          * For legacy, update frame history with for each Tx retry.
 989          */
 990                 retries = info->status.rates[0].count - 1;
 991                 /* HW doesn't send more than 15 retries */
 992                 retries = min(retries, 15);
 993
 994                 /* The last transmission may have been successful */
 995                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
 996                 /* Collect data for each rate used during failed TX attempts */
 997                 for (i = 0; i <= retries; ++i) {
 998                         tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
 999                         rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1000                                         &tbl_type, &rs_index);
1001                         /*
1002                          * Only collect stats if retried rate is in the same RS
1003                          * table as active/search.
1004                          */
1005                         if (table_type_matches(&tbl_type, curr_tbl))
1006                                 tmp_tbl = curr_tbl;
1007                         else if (table_type_matches(&tbl_type, other_tbl))
1008                                 tmp_tbl = other_tbl;
1009                         else
1010                                 continue;
1011                         rs_collect_tx_data(tmp_tbl, rs_index, 1,
1012                                            i < retries ? 0 : legacy_success);
1013                 }
1014
1015                 /* Update success/fail counts if not searching for new mode */
1016                 if (lq_sta->stay_in_tbl) {
1017                         lq_sta->total_success += legacy_success;
1018                         lq_sta->total_failed += retries + (1 - legacy_success);
1019                 }
1020         }
1021         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1022         lq_sta->last_rate_n_flags = tx_rate;
1023 done:
1024         /* See if there's a better rate or modulation mode to try. */
1025         if (sta && sta->deflink.supp_rates[sband->band])
1026                 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1027
1028         if (priv->lib->bt_params && priv->lib->bt_params->advanced_bt_coexist)
1029                 rs_bt_update_lq(priv, ctx, lq_sta);
1030 }
1031
1032 /*
1033  * Begin a period of staying with a selected modulation mode.
1034  * Set "stay_in_tbl" flag to prevent any mode switches.
1035  * Set frame tx success limits according to legacy vs. high-throughput,
1036  * and reset overall (spanning all rates) tx success history statistics.
1037  * These control how long we stay using same modulation mode before
1038  * searching for a new mode.
1039  */
1040 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1041                                  struct iwl_lq_sta *lq_sta)
1042 {
1043         IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1044         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1045         if (is_legacy) {
1046                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1047                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1048                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1049         } else {
1050                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1051                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1052                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1053         }
1054         lq_sta->table_count = 0;
1055         lq_sta->total_failed = 0;
1056         lq_sta->total_success = 0;
1057         lq_sta->flush_timer = jiffies;
1058         lq_sta->action_counter = 0;
1059 }
1060
1061 /*
1062  * Find correct throughput table for given mode of modulation
1063  */
1064 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1065                                       struct iwl_scale_tbl_info *tbl)
1066 {
1067         /* Used to choose among HT tables */
1068         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1069
1070         /* Check for invalid LQ type */
1071         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1072                 tbl->expected_tpt = expected_tpt_legacy;
1073                 return;
1074         }
1075
1076         /* Legacy rates have only one table */
1077         if (is_legacy(tbl->lq_type)) {
1078                 tbl->expected_tpt = expected_tpt_legacy;
1079                 return;
1080         }
1081
1082         /* Choose among many HT tables depending on number of streams
1083          * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1084          * status */
1085         if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1086                 ht_tbl_pointer = expected_tpt_siso20MHz;
1087         else if (is_siso(tbl->lq_type))
1088                 ht_tbl_pointer = expected_tpt_siso40MHz;
1089         else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1090                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1091         else if (is_mimo2(tbl->lq_type))
1092                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1093         else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1094                 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1095         else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1096                 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1097
1098         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
1099                 tbl->expected_tpt = ht_tbl_pointer[0];
1100         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1101                 tbl->expected_tpt = ht_tbl_pointer[1];
1102         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1103                 tbl->expected_tpt = ht_tbl_pointer[2];
1104         else                                            /* AGG+SGI */
1105                 tbl->expected_tpt = ht_tbl_pointer[3];
1106 }
1107
1108 /*
1109  * Find starting rate for new "search" high-throughput mode of modulation.
1110  * Goal is to find lowest expected rate (under perfect conditions) that is
1111  * above the current measured throughput of "active" mode, to give new mode
1112  * a fair chance to prove itself without too many challenges.
1113  *
1114  * This gets called when transitioning to more aggressive modulation
1115  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1116  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1117  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1118  * bit rate will typically need to increase, but not if performance was bad.
1119  */
1120 static s32 rs_get_best_rate(struct iwl_priv *priv,
1121                             struct iwl_lq_sta *lq_sta,
1122                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1123                             u16 rate_mask, s8 index)
1124 {
1125         /* "active" values */
1126         struct iwl_scale_tbl_info *active_tbl =
1127             &(lq_sta->lq_info[lq_sta->active_tbl]);
1128         s32 active_sr = active_tbl->win[index].success_ratio;
1129         s32 active_tpt = active_tbl->expected_tpt[index];
1130         /* expected "search" throughput */
1131         const u16 *tpt_tbl = tbl->expected_tpt;
1132
1133         s32 new_rate, high, low, start_hi;
1134         u16 high_low;
1135         s8 rate = index;
1136
1137         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1138
1139         for (; ;) {
1140                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1141                                                 tbl->lq_type);
1142
1143                 low = high_low & 0xff;
1144                 high = (high_low >> 8) & 0xff;
1145
1146                 /*
1147                  * Lower the "search" bit rate, to give new "search" mode
1148                  * approximately the same throughput as "active" if:
1149                  *
1150                  * 1) "Active" mode has been working modestly well (but not
1151                  *    great), and expected "search" throughput (under perfect
1152                  *    conditions) at candidate rate is above the actual
1153                  *    measured "active" throughput (but less than expected
1154                  *    "active" throughput under perfect conditions).
1155                  * OR
1156                  * 2) "Active" mode has been working perfectly or very well
1157                  *    and expected "search" throughput (under perfect
1158                  *    conditions) at candidate rate is above expected
1159                  *    "active" throughput (under perfect conditions).
1160                  */
1161                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1162                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1163                       (active_sr <= IWL_RATE_HIGH_TH) &&
1164                       (tpt_tbl[rate] <= active_tpt))) ||
1165                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1166                      (tpt_tbl[rate] > active_tpt))) {
1167
1168                         /* (2nd or later pass)
1169                          * If we've already tried to raise the rate, and are
1170                          * now trying to lower it, use the higher rate. */
1171                         if (start_hi != IWL_RATE_INVALID) {
1172                                 new_rate = start_hi;
1173                                 break;
1174                         }
1175
1176                         new_rate = rate;
1177
1178                         /* Loop again with lower rate */
1179                         if (low != IWL_RATE_INVALID)
1180                                 rate = low;
1181
1182                         /* Lower rate not available, use the original */
1183                         else
1184                                 break;
1185
1186                 /* Else try to raise the "search" rate to match "active" */
1187                 } else {
1188                         /* (2nd or later pass)
1189                          * If we've already tried to lower the rate, and are
1190                          * now trying to raise it, use the lower rate. */
1191                         if (new_rate != IWL_RATE_INVALID)
1192                                 break;
1193
1194                         /* Loop again with higher rate */
1195                         else if (high != IWL_RATE_INVALID) {
1196                                 start_hi = high;
1197                                 rate = high;
1198
1199                         /* Higher rate not available, use the original */
1200                         } else {
1201                                 new_rate = rate;
1202                                 break;
1203                         }
1204                 }
1205         }
1206
1207         return new_rate;
1208 }
1209
1210 /*
1211  * Set up search table for MIMO2
1212  */
1213 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1214                              struct iwl_lq_sta *lq_sta,
1215                              struct ieee80211_conf *conf,
1216                              struct ieee80211_sta *sta,
1217                              struct iwl_scale_tbl_info *tbl, int index)
1218 {
1219         u16 rate_mask;
1220         s32 rate;
1221         s8 is_green = lq_sta->is_green;
1222         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1223         struct iwl_rxon_context *ctx = sta_priv->ctx;
1224
1225         if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported)
1226                 return -1;
1227
1228         if (sta->deflink.smps_mode == IEEE80211_SMPS_STATIC)
1229                 return -1;
1230
1231         /* Need both Tx chains/antennas to support MIMO */
1232         if (priv->hw_params.tx_chains_num < 2)
1233                 return -1;
1234
1235         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1236
1237         tbl->lq_type = LQ_MIMO2;
1238         tbl->is_dup = lq_sta->is_dup;
1239         tbl->action = 0;
1240         tbl->max_search = IWL_MAX_SEARCH;
1241         rate_mask = lq_sta->active_mimo2_rate;
1242
1243         if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1244                 tbl->is_ht40 = 1;
1245         else
1246                 tbl->is_ht40 = 0;
1247
1248         rs_set_expected_tpt_table(lq_sta, tbl);
1249
1250         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1251
1252         IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1253         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1254                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1255                                                 rate, rate_mask);
1256                 return -1;
1257         }
1258         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1259
1260         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1261                      tbl->current_rate, is_green);
1262         return 0;
1263 }
1264
1265 /*
1266  * Set up search table for MIMO3
1267  */
1268 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1269                              struct iwl_lq_sta *lq_sta,
1270                              struct ieee80211_conf *conf,
1271                              struct ieee80211_sta *sta,
1272                              struct iwl_scale_tbl_info *tbl, int index)
1273 {
1274         u16 rate_mask;
1275         s32 rate;
1276         s8 is_green = lq_sta->is_green;
1277         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1278         struct iwl_rxon_context *ctx = sta_priv->ctx;
1279
1280         if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported)
1281                 return -1;
1282
1283         if (sta->deflink.smps_mode == IEEE80211_SMPS_STATIC)
1284                 return -1;
1285
1286         /* Need both Tx chains/antennas to support MIMO */
1287         if (priv->hw_params.tx_chains_num < 3)
1288                 return -1;
1289
1290         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1291
1292         tbl->lq_type = LQ_MIMO3;
1293         tbl->is_dup = lq_sta->is_dup;
1294         tbl->action = 0;
1295         tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1296         rate_mask = lq_sta->active_mimo3_rate;
1297
1298         if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1299                 tbl->is_ht40 = 1;
1300         else
1301                 tbl->is_ht40 = 0;
1302
1303         rs_set_expected_tpt_table(lq_sta, tbl);
1304
1305         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1306
1307         IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1308                 rate, rate_mask);
1309         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1310                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1311                                                 rate, rate_mask);
1312                 return -1;
1313         }
1314         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1315
1316         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1317                      tbl->current_rate, is_green);
1318         return 0;
1319 }
1320
1321 /*
1322  * Set up search table for SISO
1323  */
1324 static int rs_switch_to_siso(struct iwl_priv *priv,
1325                              struct iwl_lq_sta *lq_sta,
1326                              struct ieee80211_conf *conf,
1327                              struct ieee80211_sta *sta,
1328                              struct iwl_scale_tbl_info *tbl, int index)
1329 {
1330         u16 rate_mask;
1331         u8 is_green = lq_sta->is_green;
1332         s32 rate;
1333         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1334         struct iwl_rxon_context *ctx = sta_priv->ctx;
1335
1336         if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported)
1337                 return -1;
1338
1339         IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1340
1341         tbl->is_dup = lq_sta->is_dup;
1342         tbl->lq_type = LQ_SISO;
1343         tbl->action = 0;
1344         tbl->max_search = IWL_MAX_SEARCH;
1345         rate_mask = lq_sta->active_siso_rate;
1346
1347         if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1348                 tbl->is_ht40 = 1;
1349         else
1350                 tbl->is_ht40 = 0;
1351
1352         if (is_green)
1353                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1354
1355         rs_set_expected_tpt_table(lq_sta, tbl);
1356         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1357
1358         IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1359         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1360                 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1361                              rate, rate_mask);
1362                 return -1;
1363         }
1364         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1365         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1366                      tbl->current_rate, is_green);
1367         return 0;
1368 }
1369
1370 /*
1371  * Try to switch to new modulation mode from legacy
1372  */
1373 static void rs_move_legacy_other(struct iwl_priv *priv,
1374                                  struct iwl_lq_sta *lq_sta,
1375                                  struct ieee80211_conf *conf,
1376                                  struct ieee80211_sta *sta,
1377                                  int index)
1378 {
1379         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1380         struct iwl_scale_tbl_info *search_tbl =
1381                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1382         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1383         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1384                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1385         u8 start_action;
1386         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1387         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1388         int ret = 0;
1389         u8 update_search_tbl_counter = 0;
1390
1391         switch (priv->bt_traffic_load) {
1392         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1393                 /* nothing */
1394                 break;
1395         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1396                 /* avoid antenna B unless MIMO */
1397                 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1398                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1399                 break;
1400         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1401         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1402                 /* avoid antenna B and MIMO */
1403                 valid_tx_ant =
1404                         first_antenna(priv->nvm_data->valid_tx_ant);
1405                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1406                     tbl->action != IWL_LEGACY_SWITCH_SISO)
1407                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1408                 break;
1409         default:
1410                 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1411                 break;
1412         }
1413
1414         if (!iwl_ht_enabled(priv))
1415                 /* stay in Legacy */
1416                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1417         else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1418                    tbl->action > IWL_LEGACY_SWITCH_SISO)
1419                 tbl->action = IWL_LEGACY_SWITCH_SISO;
1420
1421         /* configure as 1x1 if bt full concurrency */
1422         if (priv->bt_full_concurrent) {
1423                 if (!iwl_ht_enabled(priv))
1424                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1425                 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1426                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1427                 valid_tx_ant =
1428                         first_antenna(priv->nvm_data->valid_tx_ant);
1429         }
1430
1431         start_action = tbl->action;
1432         for (; ;) {
1433                 lq_sta->action_counter++;
1434                 switch (tbl->action) {
1435                 case IWL_LEGACY_SWITCH_ANTENNA1:
1436                 case IWL_LEGACY_SWITCH_ANTENNA2:
1437                         IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1438
1439                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1440                                                         tx_chains_num <= 1) ||
1441                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1442                                                         tx_chains_num <= 2))
1443                                 break;
1444
1445                         /* Don't change antenna if success has been great */
1446                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1447                             !priv->bt_full_concurrent &&
1448                             priv->bt_traffic_load ==
1449                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1450                                 break;
1451
1452                         /* Set up search table to try other antenna */
1453                         memcpy(search_tbl, tbl, sz);
1454
1455                         if (rs_toggle_antenna(valid_tx_ant,
1456                                 &search_tbl->current_rate, search_tbl)) {
1457                                 update_search_tbl_counter = 1;
1458                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1459                                 goto out;
1460                         }
1461                         break;
1462                 case IWL_LEGACY_SWITCH_SISO:
1463                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1464
1465                         /* Set up search table to try SISO */
1466                         memcpy(search_tbl, tbl, sz);
1467                         search_tbl->is_SGI = 0;
1468                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1469                                                  search_tbl, index);
1470                         if (!ret) {
1471                                 lq_sta->action_counter = 0;
1472                                 goto out;
1473                         }
1474
1475                         break;
1476                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1477                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1478                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1479                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1480
1481                         /* Set up search table to try MIMO */
1482                         memcpy(search_tbl, tbl, sz);
1483                         search_tbl->is_SGI = 0;
1484
1485                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1486                                 search_tbl->ant_type = ANT_AB;
1487                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1488                                 search_tbl->ant_type = ANT_AC;
1489                         else
1490                                 search_tbl->ant_type = ANT_BC;
1491
1492                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1493                                 break;
1494
1495                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1496                                                  search_tbl, index);
1497                         if (!ret) {
1498                                 lq_sta->action_counter = 0;
1499                                 goto out;
1500                         }
1501                         break;
1502
1503                 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1504                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1505
1506                         /* Set up search table to try MIMO3 */
1507                         memcpy(search_tbl, tbl, sz);
1508                         search_tbl->is_SGI = 0;
1509
1510                         search_tbl->ant_type = ANT_ABC;
1511
1512                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1513                                 break;
1514
1515                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1516                                                  search_tbl, index);
1517                         if (!ret) {
1518                                 lq_sta->action_counter = 0;
1519                                 goto out;
1520                         }
1521                         break;
1522                 }
1523                 tbl->action++;
1524                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1525                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1526
1527                 if (tbl->action == start_action)
1528                         break;
1529
1530         }
1531         search_tbl->lq_type = LQ_NONE;
1532         return;
1533
1534 out:
1535         lq_sta->search_better_tbl = 1;
1536         tbl->action++;
1537         if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1538                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1539         if (update_search_tbl_counter)
1540                 search_tbl->action = tbl->action;
1541 }
1542
1543 /*
1544  * Try to switch to new modulation mode from SISO
1545  */
1546 static void rs_move_siso_to_other(struct iwl_priv *priv,
1547                                   struct iwl_lq_sta *lq_sta,
1548                                   struct ieee80211_conf *conf,
1549                                   struct ieee80211_sta *sta, int index)
1550 {
1551         u8 is_green = lq_sta->is_green;
1552         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1553         struct iwl_scale_tbl_info *search_tbl =
1554                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1555         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1556         struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
1557         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1558                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1559         u8 start_action;
1560         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1561         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1562         u8 update_search_tbl_counter = 0;
1563         int ret;
1564
1565         switch (priv->bt_traffic_load) {
1566         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1567                 /* nothing */
1568                 break;
1569         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1570                 /* avoid antenna B unless MIMO */
1571                 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1572                         tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1573                 break;
1574         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1575         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1576                 /* avoid antenna B and MIMO */
1577                 valid_tx_ant =
1578                         first_antenna(priv->nvm_data->valid_tx_ant);
1579                 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1580                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1581                 break;
1582         default:
1583                 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1584                 break;
1585         }
1586
1587         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1588             tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1589                 /* stay in SISO */
1590                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1591         }
1592
1593         /* configure as 1x1 if bt full concurrency */
1594         if (priv->bt_full_concurrent) {
1595                 valid_tx_ant =
1596                         first_antenna(priv->nvm_data->valid_tx_ant);
1597                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1598                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1599         }
1600
1601         start_action = tbl->action;
1602         for (;;) {
1603                 lq_sta->action_counter++;
1604                 switch (tbl->action) {
1605                 case IWL_SISO_SWITCH_ANTENNA1:
1606                 case IWL_SISO_SWITCH_ANTENNA2:
1607                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1608                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1609                                                 tx_chains_num <= 1) ||
1610                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1611                                                 tx_chains_num <= 2))
1612                                 break;
1613
1614                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1615                             !priv->bt_full_concurrent &&
1616                             priv->bt_traffic_load ==
1617                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1618                                 break;
1619
1620                         memcpy(search_tbl, tbl, sz);
1621                         if (rs_toggle_antenna(valid_tx_ant,
1622                                        &search_tbl->current_rate, search_tbl)) {
1623                                 update_search_tbl_counter = 1;
1624                                 goto out;
1625                         }
1626                         break;
1627                 case IWL_SISO_SWITCH_MIMO2_AB:
1628                 case IWL_SISO_SWITCH_MIMO2_AC:
1629                 case IWL_SISO_SWITCH_MIMO2_BC:
1630                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1631                         memcpy(search_tbl, tbl, sz);
1632                         search_tbl->is_SGI = 0;
1633
1634                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1635                                 search_tbl->ant_type = ANT_AB;
1636                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1637                                 search_tbl->ant_type = ANT_AC;
1638                         else
1639                                 search_tbl->ant_type = ANT_BC;
1640
1641                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1642                                 break;
1643
1644                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1645                                                  search_tbl, index);
1646                         if (!ret)
1647                                 goto out;
1648                         break;
1649                 case IWL_SISO_SWITCH_GI:
1650                         if (!tbl->is_ht40 && !(ht_cap->cap &
1651                                                 IEEE80211_HT_CAP_SGI_20))
1652                                 break;
1653                         if (tbl->is_ht40 && !(ht_cap->cap &
1654                                                 IEEE80211_HT_CAP_SGI_40))
1655                                 break;
1656
1657                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1658
1659                         memcpy(search_tbl, tbl, sz);
1660                         if (is_green) {
1661                                 if (!tbl->is_SGI)
1662                                         break;
1663                                 else
1664                                         IWL_ERR(priv,
1665                                                 "SGI was set in GF+SISO\n");
1666                         }
1667                         search_tbl->is_SGI = !tbl->is_SGI;
1668                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1669                         if (tbl->is_SGI) {
1670                                 s32 tpt = lq_sta->last_tpt / 100;
1671                                 if (tpt >= search_tbl->expected_tpt[index])
1672                                         break;
1673                         }
1674                         search_tbl->current_rate =
1675                                 rate_n_flags_from_tbl(priv, search_tbl,
1676                                                       index, is_green);
1677                         update_search_tbl_counter = 1;
1678                         goto out;
1679                 case IWL_SISO_SWITCH_MIMO3_ABC:
1680                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1681                         memcpy(search_tbl, tbl, sz);
1682                         search_tbl->is_SGI = 0;
1683                         search_tbl->ant_type = ANT_ABC;
1684
1685                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1686                                 break;
1687
1688                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1689                                                  search_tbl, index);
1690                         if (!ret)
1691                                 goto out;
1692                         break;
1693                 }
1694                 tbl->action++;
1695                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1696                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1697
1698                 if (tbl->action == start_action)
1699                         break;
1700         }
1701         search_tbl->lq_type = LQ_NONE;
1702         return;
1703
1704  out:
1705         lq_sta->search_better_tbl = 1;
1706         tbl->action++;
1707         if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1708                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1709         if (update_search_tbl_counter)
1710                 search_tbl->action = tbl->action;
1711 }
1712
1713 /*
1714  * Try to switch to new modulation mode from MIMO2
1715  */
1716 static void rs_move_mimo2_to_other(struct iwl_priv *priv,
1717                                    struct iwl_lq_sta *lq_sta,
1718                                    struct ieee80211_conf *conf,
1719                                    struct ieee80211_sta *sta, int index)
1720 {
1721         s8 is_green = lq_sta->is_green;
1722         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1723         struct iwl_scale_tbl_info *search_tbl =
1724                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1725         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1726         struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
1727         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1728                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1729         u8 start_action;
1730         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1731         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1732         u8 update_search_tbl_counter = 0;
1733         int ret;
1734
1735         switch (priv->bt_traffic_load) {
1736         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1737                 /* nothing */
1738                 break;
1739         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1740         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1741                 /* avoid antenna B and MIMO */
1742                 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1743                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1744                 break;
1745         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1746                 /* avoid antenna B unless MIMO */
1747                 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1748                     tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1749                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1750                 break;
1751         default:
1752                 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1753                 break;
1754         }
1755
1756         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1757             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1758              tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1759                 /* switch in SISO */
1760                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1761         }
1762
1763         /* configure as 1x1 if bt full concurrency */
1764         if (priv->bt_full_concurrent &&
1765             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1766              tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1767                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1768
1769         start_action = tbl->action;
1770         for (;;) {
1771                 lq_sta->action_counter++;
1772                 switch (tbl->action) {
1773                 case IWL_MIMO2_SWITCH_ANTENNA1:
1774                 case IWL_MIMO2_SWITCH_ANTENNA2:
1775                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1776
1777                         if (tx_chains_num <= 2)
1778                                 break;
1779
1780                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1781                                 break;
1782
1783                         memcpy(search_tbl, tbl, sz);
1784                         if (rs_toggle_antenna(valid_tx_ant,
1785                                        &search_tbl->current_rate, search_tbl)) {
1786                                 update_search_tbl_counter = 1;
1787                                 goto out;
1788                         }
1789                         break;
1790                 case IWL_MIMO2_SWITCH_SISO_A:
1791                 case IWL_MIMO2_SWITCH_SISO_B:
1792                 case IWL_MIMO2_SWITCH_SISO_C:
1793                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1794
1795                         /* Set up new search table for SISO */
1796                         memcpy(search_tbl, tbl, sz);
1797
1798                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1799                                 search_tbl->ant_type = ANT_A;
1800                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1801                                 search_tbl->ant_type = ANT_B;
1802                         else
1803                                 search_tbl->ant_type = ANT_C;
1804
1805                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1806                                 break;
1807
1808                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1809                                                  search_tbl, index);
1810                         if (!ret)
1811                                 goto out;
1812
1813                         break;
1814
1815                 case IWL_MIMO2_SWITCH_GI:
1816                         if (!tbl->is_ht40 && !(ht_cap->cap &
1817                                                 IEEE80211_HT_CAP_SGI_20))
1818                                 break;
1819                         if (tbl->is_ht40 && !(ht_cap->cap &
1820                                                 IEEE80211_HT_CAP_SGI_40))
1821                                 break;
1822
1823                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1824
1825                         /* Set up new search table for MIMO2 */
1826                         memcpy(search_tbl, tbl, sz);
1827                         search_tbl->is_SGI = !tbl->is_SGI;
1828                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1829                         /*
1830                          * If active table already uses the fastest possible
1831                          * modulation (dual stream with short guard interval),
1832                          * and it's working well, there's no need to look
1833                          * for a better type of modulation!
1834                          */
1835                         if (tbl->is_SGI) {
1836                                 s32 tpt = lq_sta->last_tpt / 100;
1837                                 if (tpt >= search_tbl->expected_tpt[index])
1838                                         break;
1839                         }
1840                         search_tbl->current_rate =
1841                                 rate_n_flags_from_tbl(priv, search_tbl,
1842                                                       index, is_green);
1843                         update_search_tbl_counter = 1;
1844                         goto out;
1845
1846                 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1847                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1848                         memcpy(search_tbl, tbl, sz);
1849                         search_tbl->is_SGI = 0;
1850                         search_tbl->ant_type = ANT_ABC;
1851
1852                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1853                                 break;
1854
1855                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1856                                                  search_tbl, index);
1857                         if (!ret)
1858                                 goto out;
1859
1860                         break;
1861                 }
1862                 tbl->action++;
1863                 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1864                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1865
1866                 if (tbl->action == start_action)
1867                         break;
1868         }
1869         search_tbl->lq_type = LQ_NONE;
1870         return;
1871  out:
1872         lq_sta->search_better_tbl = 1;
1873         tbl->action++;
1874         if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1875                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1876         if (update_search_tbl_counter)
1877                 search_tbl->action = tbl->action;
1878
1879 }
1880
1881 /*
1882  * Try to switch to new modulation mode from MIMO3
1883  */
1884 static void rs_move_mimo3_to_other(struct iwl_priv *priv,
1885                                    struct iwl_lq_sta *lq_sta,
1886                                    struct ieee80211_conf *conf,
1887                                    struct ieee80211_sta *sta, int index)
1888 {
1889         s8 is_green = lq_sta->is_green;
1890         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1891         struct iwl_scale_tbl_info *search_tbl =
1892                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1893         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1894         struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
1895         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1896                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1897         u8 start_action;
1898         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1899         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1900         int ret;
1901         u8 update_search_tbl_counter = 0;
1902
1903         switch (priv->bt_traffic_load) {
1904         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1905                 /* nothing */
1906                 break;
1907         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1908         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1909                 /* avoid antenna B and MIMO */
1910                 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1911                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1912                 break;
1913         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1914                 /* avoid antenna B unless MIMO */
1915                 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1916                     tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1917                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1918                 break;
1919         default:
1920                 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1921                 break;
1922         }
1923
1924         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1925             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1926              tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1927                 /* switch in SISO */
1928                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1929         }
1930
1931         /* configure as 1x1 if bt full concurrency */
1932         if (priv->bt_full_concurrent &&
1933             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1934              tbl->action > IWL_MIMO3_SWITCH_SISO_C))
1935                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1936
1937         start_action = tbl->action;
1938         for (;;) {
1939                 lq_sta->action_counter++;
1940                 switch (tbl->action) {
1941                 case IWL_MIMO3_SWITCH_ANTENNA1:
1942                 case IWL_MIMO3_SWITCH_ANTENNA2:
1943                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1944
1945                         if (tx_chains_num <= 3)
1946                                 break;
1947
1948                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1949                                 break;
1950
1951                         memcpy(search_tbl, tbl, sz);
1952                         if (rs_toggle_antenna(valid_tx_ant,
1953                                        &search_tbl->current_rate, search_tbl))
1954                                 goto out;
1955                         break;
1956                 case IWL_MIMO3_SWITCH_SISO_A:
1957                 case IWL_MIMO3_SWITCH_SISO_B:
1958                 case IWL_MIMO3_SWITCH_SISO_C:
1959                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1960
1961                         /* Set up new search table for SISO */
1962                         memcpy(search_tbl, tbl, sz);
1963
1964                         if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1965                                 search_tbl->ant_type = ANT_A;
1966                         else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1967                                 search_tbl->ant_type = ANT_B;
1968                         else
1969                                 search_tbl->ant_type = ANT_C;
1970
1971                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1972                                 break;
1973
1974                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1975                                                  search_tbl, index);
1976                         if (!ret)
1977                                 goto out;
1978
1979                         break;
1980
1981                 case IWL_MIMO3_SWITCH_MIMO2_AB:
1982                 case IWL_MIMO3_SWITCH_MIMO2_AC:
1983                 case IWL_MIMO3_SWITCH_MIMO2_BC:
1984                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1985
1986                         memcpy(search_tbl, tbl, sz);
1987                         search_tbl->is_SGI = 0;
1988                         if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1989                                 search_tbl->ant_type = ANT_AB;
1990                         else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1991                                 search_tbl->ant_type = ANT_AC;
1992                         else
1993                                 search_tbl->ant_type = ANT_BC;
1994
1995                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1996                                 break;
1997
1998                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1999                                                  search_tbl, index);
2000                         if (!ret)
2001                                 goto out;
2002
2003                         break;
2004
2005                 case IWL_MIMO3_SWITCH_GI:
2006                         if (!tbl->is_ht40 && !(ht_cap->cap &
2007                                                 IEEE80211_HT_CAP_SGI_20))
2008                                 break;
2009                         if (tbl->is_ht40 && !(ht_cap->cap &
2010                                                 IEEE80211_HT_CAP_SGI_40))
2011                                 break;
2012
2013                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2014
2015                         /* Set up new search table for MIMO */
2016                         memcpy(search_tbl, tbl, sz);
2017                         search_tbl->is_SGI = !tbl->is_SGI;
2018                         rs_set_expected_tpt_table(lq_sta, search_tbl);
2019                         /*
2020                          * If active table already uses the fastest possible
2021                          * modulation (dual stream with short guard interval),
2022                          * and it's working well, there's no need to look
2023                          * for a better type of modulation!
2024                          */
2025                         if (tbl->is_SGI) {
2026                                 s32 tpt = lq_sta->last_tpt / 100;
2027                                 if (tpt >= search_tbl->expected_tpt[index])
2028                                         break;
2029                         }
2030                         search_tbl->current_rate =
2031                                 rate_n_flags_from_tbl(priv, search_tbl,
2032                                                       index, is_green);
2033                         update_search_tbl_counter = 1;
2034                         goto out;
2035                 }
2036                 tbl->action++;
2037                 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2038                         tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2039
2040                 if (tbl->action == start_action)
2041                         break;
2042         }
2043         search_tbl->lq_type = LQ_NONE;
2044         return;
2045  out:
2046         lq_sta->search_better_tbl = 1;
2047         tbl->action++;
2048         if (tbl->action > IWL_MIMO3_SWITCH_GI)
2049                 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2050         if (update_search_tbl_counter)
2051                 search_tbl->action = tbl->action;
2052 }
2053
2054 /*
2055  * Check whether we should continue using same modulation mode, or
2056  * begin search for a new mode, based on:
2057  * 1) # tx successes or failures while using this mode
2058  * 2) # times calling this function
2059  * 3) elapsed time in this mode (not used, for now)
2060  */
2061 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2062 {
2063         struct iwl_scale_tbl_info *tbl;
2064         int i;
2065         int active_tbl;
2066         int flush_interval_passed = 0;
2067         struct iwl_priv *priv;
2068
2069         priv = lq_sta->drv;
2070         active_tbl = lq_sta->active_tbl;
2071
2072         tbl = &(lq_sta->lq_info[active_tbl]);
2073
2074         /* If we've been disallowing search, see if we should now allow it */
2075         if (lq_sta->stay_in_tbl) {
2076
2077                 /* Elapsed time using current modulation mode */
2078                 if (lq_sta->flush_timer)
2079                         flush_interval_passed =
2080                         time_after(jiffies,
2081                                         (unsigned long)(lq_sta->flush_timer +
2082                                         IWL_RATE_SCALE_FLUSH_INTVL));
2083
2084                 /*
2085                  * Check if we should allow search for new modulation mode.
2086                  * If many frames have failed or succeeded, or we've used
2087                  * this same modulation for a long time, allow search, and
2088                  * reset history stats that keep track of whether we should
2089                  * allow a new search.  Also (below) reset all bitmaps and
2090                  * stats in active history.
2091                  */
2092                 if (force_search ||
2093                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2094                     (lq_sta->total_success > lq_sta->max_success_limit) ||
2095                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2096                      && (flush_interval_passed))) {
2097                         IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n",
2098                                      lq_sta->total_failed,
2099                                      lq_sta->total_success,
2100                                      flush_interval_passed);
2101
2102                         /* Allow search for new mode */
2103                         lq_sta->stay_in_tbl = 0;        /* only place reset */
2104                         lq_sta->total_failed = 0;
2105                         lq_sta->total_success = 0;
2106                         lq_sta->flush_timer = 0;
2107
2108                 /*
2109                  * Else if we've used this modulation mode enough repetitions
2110                  * (regardless of elapsed time or success/failure), reset
2111                  * history bitmaps and rate-specific stats for all rates in
2112                  * active table.
2113                  */
2114                 } else {
2115                         lq_sta->table_count++;
2116                         if (lq_sta->table_count >=
2117                             lq_sta->table_count_limit) {
2118                                 lq_sta->table_count = 0;
2119
2120                                 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2121                                 for (i = 0; i < IWL_RATE_COUNT; i++)
2122                                         rs_rate_scale_clear_window(
2123                                                 &(tbl->win[i]));
2124                         }
2125                 }
2126
2127                 /* If transitioning to allow "search", reset all history
2128                  * bitmaps and stats in active table (this will become the new
2129                  * "search" table). */
2130                 if (!lq_sta->stay_in_tbl) {
2131                         for (i = 0; i < IWL_RATE_COUNT; i++)
2132                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2133                 }
2134         }
2135 }
2136
2137 /*
2138  * setup rate table in uCode
2139  */
2140 static void rs_update_rate_tbl(struct iwl_priv *priv,
2141                                struct iwl_rxon_context *ctx,
2142                                struct iwl_lq_sta *lq_sta,
2143                                struct iwl_scale_tbl_info *tbl,
2144                                int index, u8 is_green)
2145 {
2146         u32 rate;
2147
2148         /* Update uCode's rate table. */
2149         rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2150         rs_fill_link_cmd(priv, lq_sta, rate);
2151         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2152 }
2153
2154 /*
2155  * Do rate scaling and search for new modulation mode.
2156  */
2157 static void rs_rate_scale_perform(struct iwl_priv *priv,
2158                                   struct sk_buff *skb,
2159                                   struct ieee80211_sta *sta,
2160                                   struct iwl_lq_sta *lq_sta)
2161 {
2162         struct ieee80211_hw *hw = priv->hw;
2163         struct ieee80211_conf *conf = &hw->conf;
2164         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2165         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2166         int low = IWL_RATE_INVALID;
2167         int high = IWL_RATE_INVALID;
2168         int index;
2169         int i;
2170         struct iwl_rate_scale_data *window = NULL;
2171         int current_tpt = IWL_INVALID_VALUE;
2172         int low_tpt = IWL_INVALID_VALUE;
2173         int high_tpt = IWL_INVALID_VALUE;
2174         u32 fail_count;
2175         s8 scale_action = 0;
2176         u16 rate_mask;
2177         u8 update_lq = 0;
2178         struct iwl_scale_tbl_info *tbl, *tbl1;
2179         u16 rate_scale_index_msk = 0;
2180         u8 is_green = 0;
2181         u8 active_tbl = 0;
2182         u8 done_search = 0;
2183         u16 high_low;
2184         s32 sr;
2185         u8 tid = IWL_MAX_TID_COUNT;
2186         struct iwl_tid_data *tid_data;
2187         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2188         struct iwl_rxon_context *ctx = sta_priv->ctx;
2189
2190         IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2191
2192         /* Send management frames and NO_ACK data using lowest rate. */
2193         /* TODO: this could probably be improved.. */
2194         if (!ieee80211_is_data(hdr->frame_control) ||
2195             info->flags & IEEE80211_TX_CTL_NO_ACK)
2196                 return;
2197
2198         lq_sta->supp_rates = sta->deflink.supp_rates[lq_sta->band];
2199
2200         tid = rs_tl_add_packet(lq_sta, hdr);
2201         if ((tid != IWL_MAX_TID_COUNT) &&
2202             (lq_sta->tx_agg_tid_en & (1 << tid))) {
2203                 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid];
2204                 if (tid_data->agg.state == IWL_AGG_OFF)
2205                         lq_sta->is_agg = 0;
2206                 else
2207                         lq_sta->is_agg = 1;
2208         } else
2209                 lq_sta->is_agg = 0;
2210
2211         /*
2212          * Select rate-scale / modulation-mode table to work with in
2213          * the rest of this function:  "search" if searching for better
2214          * modulation mode, or "active" if doing rate scaling within a mode.
2215          */
2216         if (!lq_sta->search_better_tbl)
2217                 active_tbl = lq_sta->active_tbl;
2218         else
2219                 active_tbl = 1 - lq_sta->active_tbl;
2220
2221         tbl = &(lq_sta->lq_info[active_tbl]);
2222         if (is_legacy(tbl->lq_type))
2223                 lq_sta->is_green = 0;
2224         else
2225                 lq_sta->is_green = rs_use_green(sta);
2226         is_green = lq_sta->is_green;
2227
2228         /* current tx rate */
2229         index = lq_sta->last_txrate_idx;
2230
2231         IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2232                        tbl->lq_type);
2233
2234         /* rates available for this association, and for modulation mode */
2235         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2236
2237         IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2238
2239         /* mask with station rate restriction */
2240         if (is_legacy(tbl->lq_type)) {
2241                 if (lq_sta->band == NL80211_BAND_5GHZ)
2242                         /* supp_rates has no CCK bits in A mode */
2243                         rate_scale_index_msk = (u16) (rate_mask &
2244                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2245                 else
2246                         rate_scale_index_msk = (u16) (rate_mask &
2247                                                       lq_sta->supp_rates);
2248
2249         } else
2250                 rate_scale_index_msk = rate_mask;
2251
2252         if (!rate_scale_index_msk)
2253                 rate_scale_index_msk = rate_mask;
2254
2255         if (!((1 << index) & rate_scale_index_msk)) {
2256                 IWL_ERR(priv, "Current Rate is not valid\n");
2257                 if (lq_sta->search_better_tbl) {
2258                         /* revert to active table if search table is not valid*/
2259                         tbl->lq_type = LQ_NONE;
2260                         lq_sta->search_better_tbl = 0;
2261                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2262                         /* get "active" rate info */
2263                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2264                         rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2265                                            index, is_green);
2266                 }
2267                 return;
2268         }
2269
2270         /* Get expected throughput table and history window for current rate */
2271         if (!tbl->expected_tpt) {
2272                 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2273                 return;
2274         }
2275
2276         /* force user max rate if set by user */
2277         if ((lq_sta->max_rate_idx != -1) &&
2278             (lq_sta->max_rate_idx < index)) {
2279                 index = lq_sta->max_rate_idx;
2280                 update_lq = 1;
2281                 window = &(tbl->win[index]);
2282                 goto lq_update;
2283         }
2284
2285         window = &(tbl->win[index]);
2286
2287         /*
2288          * If there is not enough history to calculate actual average
2289          * throughput, keep analyzing results of more tx frames, without
2290          * changing rate or mode (bypass most of the rest of this function).
2291          * Set up new rate table in uCode only if old rate is not supported
2292          * in current association (use new rate found above).
2293          */
2294         fail_count = window->counter - window->success_counter;
2295         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2296                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2297                 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2298                                "for index %d\n",
2299                                window->success_counter, window->counter, index);
2300
2301                 /* Can't calculate this yet; not enough history */
2302                 window->average_tpt = IWL_INVALID_VALUE;
2303
2304                 /* Should we stay with this modulation mode,
2305                  * or search for a new one? */
2306                 rs_stay_in_table(lq_sta, false);
2307
2308                 goto out;
2309         }
2310         /* Else we have enough samples; calculate estimate of
2311          * actual average throughput */
2312         if (window->average_tpt != ((window->success_ratio *
2313                         tbl->expected_tpt[index] + 64) / 128)) {
2314                 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2315                 window->average_tpt = ((window->success_ratio *
2316                                         tbl->expected_tpt[index] + 64) / 128);
2317         }
2318
2319         /* If we are searching for better modulation mode, check success. */
2320         if (lq_sta->search_better_tbl &&
2321             (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2322                 /* If good success, continue using the "search" mode;
2323                  * no need to send new link quality command, since we're
2324                  * continuing to use the setup that we've been trying. */
2325                 if (window->average_tpt > lq_sta->last_tpt) {
2326
2327                         IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2328                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2329                                         window->success_ratio,
2330                                         window->average_tpt,
2331                                         lq_sta->last_tpt);
2332
2333                         if (!is_legacy(tbl->lq_type))
2334                                 lq_sta->enable_counter = 1;
2335
2336                         /* Swap tables; "search" becomes "active" */
2337                         lq_sta->active_tbl = active_tbl;
2338                         current_tpt = window->average_tpt;
2339
2340                 /* Else poor success; go back to mode in "active" table */
2341                 } else {
2342
2343                         IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2344                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2345                                         window->success_ratio,
2346                                         window->average_tpt,
2347                                         lq_sta->last_tpt);
2348
2349                         /* Nullify "search" table */
2350                         tbl->lq_type = LQ_NONE;
2351
2352                         /* Revert to "active" table */
2353                         active_tbl = lq_sta->active_tbl;
2354                         tbl = &(lq_sta->lq_info[active_tbl]);
2355
2356                         /* Revert to "active" rate and throughput info */
2357                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2358                         current_tpt = lq_sta->last_tpt;
2359
2360                         /* Need to set up a new rate table in uCode */
2361                         update_lq = 1;
2362                 }
2363
2364                 /* Either way, we've made a decision; modulation mode
2365                  * search is done, allow rate adjustment next time. */
2366                 lq_sta->search_better_tbl = 0;
2367                 done_search = 1;        /* Don't switch modes below! */
2368                 goto lq_update;
2369         }
2370
2371         /* (Else) not in search of better modulation mode, try for better
2372          * starting rate, while staying in this mode. */
2373         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2374                                         tbl->lq_type);
2375         low = high_low & 0xff;
2376         high = (high_low >> 8) & 0xff;
2377
2378         /* If user set max rate, dont allow higher than user constrain */
2379         if ((lq_sta->max_rate_idx != -1) &&
2380             (lq_sta->max_rate_idx < high))
2381                 high = IWL_RATE_INVALID;
2382
2383         sr = window->success_ratio;
2384
2385         /* Collect measured throughputs for current and adjacent rates */
2386         current_tpt = window->average_tpt;
2387         if (low != IWL_RATE_INVALID)
2388                 low_tpt = tbl->win[low].average_tpt;
2389         if (high != IWL_RATE_INVALID)
2390                 high_tpt = tbl->win[high].average_tpt;
2391
2392         scale_action = 0;
2393
2394         /* Too many failures, decrease rate */
2395         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2396                 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2397                 scale_action = -1;
2398
2399         /* No throughput measured yet for adjacent rates; try increase. */
2400         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2401                    (high_tpt == IWL_INVALID_VALUE)) {
2402
2403                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2404                         scale_action = 1;
2405                 else if (low != IWL_RATE_INVALID)
2406                         scale_action = 0;
2407         }
2408
2409         /* Both adjacent throughputs are measured, but neither one has better
2410          * throughput; we're using the best rate, don't change it! */
2411         else if ((low_tpt != IWL_INVALID_VALUE) &&
2412                  (high_tpt != IWL_INVALID_VALUE) &&
2413                  (low_tpt < current_tpt) &&
2414                  (high_tpt < current_tpt))
2415                 scale_action = 0;
2416
2417         /* At least one adjacent rate's throughput is measured,
2418          * and may have better performance. */
2419         else {
2420                 /* Higher adjacent rate's throughput is measured */
2421                 if (high_tpt != IWL_INVALID_VALUE) {
2422                         /* Higher rate has better throughput */
2423                         if (high_tpt > current_tpt &&
2424                                         sr >= IWL_RATE_INCREASE_TH) {
2425                                 scale_action = 1;
2426                         } else {
2427                                 scale_action = 0;
2428                         }
2429
2430                 /* Lower adjacent rate's throughput is measured */
2431                 } else if (low_tpt != IWL_INVALID_VALUE) {
2432                         /* Lower rate has better throughput */
2433                         if (low_tpt > current_tpt) {
2434                                 IWL_DEBUG_RATE(priv,
2435                                     "decrease rate because of low tpt\n");
2436                                 scale_action = -1;
2437                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2438                                 scale_action = 1;
2439                         }
2440                 }
2441         }
2442
2443         /* Sanity check; asked for decrease, but success rate or throughput
2444          * has been good at old rate.  Don't change it. */
2445         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2446                     ((sr > IWL_RATE_HIGH_TH) ||
2447                      (current_tpt > (100 * tbl->expected_tpt[low]))))
2448                 scale_action = 0;
2449         if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2450                 scale_action = -1;
2451         if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2452                 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2453                 scale_action = -1;
2454
2455         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2456              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2457                 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2458                         /*
2459                          * don't set scale_action, don't want to scale up if
2460                          * the rate scale doesn't otherwise think that is a
2461                          * good idea.
2462                          */
2463                 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2464                         scale_action = -1;
2465                 }
2466         }
2467         lq_sta->last_bt_traffic = priv->bt_traffic_load;
2468
2469         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2470              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2471                 /* search for a new modulation */
2472                 rs_stay_in_table(lq_sta, true);
2473                 goto lq_update;
2474         }
2475
2476         switch (scale_action) {
2477         case -1:
2478                 /* Decrease starting rate, update uCode's rate table */
2479                 if (low != IWL_RATE_INVALID) {
2480                         update_lq = 1;
2481                         index = low;
2482                 }
2483
2484                 break;
2485         case 1:
2486                 /* Increase starting rate, update uCode's rate table */
2487                 if (high != IWL_RATE_INVALID) {
2488                         update_lq = 1;
2489                         index = high;
2490                 }
2491
2492                 break;
2493         case 0:
2494                 /* No change */
2495         default:
2496                 break;
2497         }
2498
2499         IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2500                     "high %d type %d\n",
2501                      index, scale_action, low, high, tbl->lq_type);
2502
2503 lq_update:
2504         /* Replace uCode's rate table for the destination station. */
2505         if (update_lq)
2506                 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2507
2508         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2509                 /* Should we stay with this modulation mode,
2510                  * or search for a new one? */
2511           rs_stay_in_table(lq_sta, false);
2512         }
2513         /*
2514          * Search for new modulation mode if we're:
2515          * 1)  Not changing rates right now
2516          * 2)  Not just finishing up a search
2517          * 3)  Allowing a new search
2518          */
2519         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2520                 /* Save current throughput to compare with "search" throughput*/
2521                 lq_sta->last_tpt = current_tpt;
2522
2523                 /* Select a new "search" modulation mode to try.
2524                  * If one is found, set up the new "search" table. */
2525                 if (is_legacy(tbl->lq_type))
2526                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2527                 else if (is_siso(tbl->lq_type))
2528                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2529                 else if (is_mimo2(tbl->lq_type))
2530                         rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2531                 else
2532                         rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2533
2534                 /* If new "search" mode was selected, set up in uCode table */
2535                 if (lq_sta->search_better_tbl) {
2536                         /* Access the "search" table, clear its history. */
2537                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2538                         for (i = 0; i < IWL_RATE_COUNT; i++)
2539                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2540
2541                         /* Use new "search" start rate */
2542                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2543
2544                         IWL_DEBUG_RATE(priv, "Switch current  mcs: %X index: %d\n",
2545                                      tbl->current_rate, index);
2546                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2547                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2548                 } else
2549                         done_search = 1;
2550         }
2551
2552         if (done_search && !lq_sta->stay_in_tbl) {
2553                 /* If the "active" (non-search) mode was legacy,
2554                  * and we've tried switching antennas,
2555                  * but we haven't been able to try HT modes (not available),
2556                  * stay with best antenna legacy modulation for a while
2557                  * before next round of mode comparisons. */
2558                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2559                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2560                     lq_sta->action_counter > tbl1->max_search) {
2561                         IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2562                         rs_set_stay_in_table(priv, 1, lq_sta);
2563                 }
2564
2565                 /* If we're in an HT mode, and all 3 mode switch actions
2566                  * have been tried and compared, stay in this best modulation
2567                  * mode for a while before next round of mode comparisons. */
2568                 if (lq_sta->enable_counter &&
2569                     (lq_sta->action_counter >= tbl1->max_search) &&
2570                     iwl_ht_enabled(priv)) {
2571                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2572                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2573                             (tid != IWL_MAX_TID_COUNT)) {
2574                                 u8 sta_id = lq_sta->lq.sta_id;
2575                                 tid_data = &priv->tid_data[sta_id][tid];
2576                                 if (tid_data->agg.state == IWL_AGG_OFF) {
2577                                         IWL_DEBUG_RATE(priv,
2578                                                        "try to aggregate tid %d\n",
2579                                                        tid);
2580                                         rs_tl_turn_on_agg(priv, tid,
2581                                                           lq_sta, sta);
2582                                 }
2583                         }
2584                         rs_set_stay_in_table(priv, 0, lq_sta);
2585                 }
2586         }
2587
2588 out:
2589         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2590         lq_sta->last_txrate_idx = index;
2591 }
2592
2593 /*
2594  * rs_initialize_lq - Initialize a station's hardware rate table
2595  *
2596  * The uCode's station table contains a table of fallback rates
2597  * for automatic fallback during transmission.
2598  *
2599  * NOTE: This sets up a default set of values.  These will be replaced later
2600  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2601  *       rc80211_simple.
2602  *
2603  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2604  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2605  *       which requires station table entry to exist).
2606  */
2607 static void rs_initialize_lq(struct iwl_priv *priv,
2608                              struct ieee80211_sta *sta,
2609                              struct iwl_lq_sta *lq_sta)
2610 {
2611         struct iwl_scale_tbl_info *tbl;
2612         int rate_idx;
2613         int i;
2614         u32 rate;
2615         u8 use_green = rs_use_green(sta);
2616         u8 active_tbl = 0;
2617         u8 valid_tx_ant;
2618         struct iwl_station_priv *sta_priv;
2619         struct iwl_rxon_context *ctx;
2620
2621         if (!sta || !lq_sta)
2622                 return;
2623
2624         sta_priv = (void *)sta->drv_priv;
2625         ctx = sta_priv->ctx;
2626
2627         i = lq_sta->last_txrate_idx;
2628
2629         valid_tx_ant = priv->nvm_data->valid_tx_ant;
2630
2631         if (!lq_sta->search_better_tbl)
2632                 active_tbl = lq_sta->active_tbl;
2633         else
2634                 active_tbl = 1 - lq_sta->active_tbl;
2635
2636         tbl = &(lq_sta->lq_info[active_tbl]);
2637
2638         if ((i < 0) || (i >= IWL_RATE_COUNT))
2639                 i = 0;
2640
2641         rate = iwl_rates[i].plcp;
2642         tbl->ant_type = first_antenna(valid_tx_ant);
2643         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2644
2645         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2646                 rate |= RATE_MCS_CCK_MSK;
2647
2648         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2649         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2650             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2651
2652         rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2653         tbl->current_rate = rate;
2654         rs_set_expected_tpt_table(lq_sta, tbl);
2655         rs_fill_link_cmd(NULL, lq_sta, rate);
2656         priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2657         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, 0, true);
2658 }
2659
2660 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2661                         struct ieee80211_tx_rate_control *txrc)
2662 {
2663
2664         struct sk_buff *skb = txrc->skb;
2665         struct ieee80211_supported_band *sband = txrc->sband;
2666         struct iwl_op_mode *op_mode __maybe_unused =
2667                         (struct iwl_op_mode *)priv_r;
2668         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2669         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2670         struct iwl_lq_sta *lq_sta = priv_sta;
2671         int rate_idx;
2672
2673         IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2674
2675         /* Get max rate if user set max rate */
2676         lq_sta->max_rate_idx = fls(txrc->rate_idx_mask) - 1;
2677         if (sband->band == NL80211_BAND_5GHZ && lq_sta->max_rate_idx != -1)
2678                 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2679         if (lq_sta->max_rate_idx < 0 || lq_sta->max_rate_idx >= IWL_RATE_COUNT)
2680                 lq_sta->max_rate_idx = -1;
2681
2682         if (!lq_sta->drv) {
2683                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2684                 /* mac80211 already set up the data for using low rates */
2685                 return;
2686         }
2687
2688         rate_idx  = lq_sta->last_txrate_idx;
2689
2690         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2691                 rate_idx -= IWL_FIRST_OFDM_RATE;
2692                 /* 6M and 9M shared same MCS index */
2693                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2694                 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2695                     IWL_RATE_MIMO3_6M_PLCP)
2696                         rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2697                 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2698                          IWL_RATE_MIMO2_6M_PLCP)
2699                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2700                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2701                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2702                         info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2703                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2704                         info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2705                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2706                         info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2707                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2708                         info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2709         } else {
2710                 /* Check for invalid rates */
2711                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2712                                 ((sband->band == NL80211_BAND_5GHZ) &&
2713                                  (rate_idx < IWL_FIRST_OFDM_RATE)))
2714                         rate_idx = rate_lowest_index(sband, sta);
2715                 /* On valid 5 GHz rate, adjust index */
2716                 else if (sband->band == NL80211_BAND_5GHZ)
2717                         rate_idx -= IWL_FIRST_OFDM_RATE;
2718                 info->control.rates[0].flags = 0;
2719         }
2720         info->control.rates[0].idx = rate_idx;
2721         info->control.rates[0].count = 1;
2722 }
2723
2724 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2725                           gfp_t gfp)
2726 {
2727         struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2728         struct iwl_op_mode *op_mode __maybe_unused =
2729                         (struct iwl_op_mode *)priv_rate;
2730         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2731
2732         IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2733
2734         return &sta_priv->lq_sta;
2735 }
2736
2737 /*
2738  * Called after adding a new station to initialize rate scaling
2739  */
2740 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2741 {
2742         int i, j;
2743         struct ieee80211_hw *hw = priv->hw;
2744         struct ieee80211_conf *conf = &priv->hw->conf;
2745         struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
2746         struct iwl_station_priv *sta_priv;
2747         struct iwl_lq_sta *lq_sta;
2748         struct ieee80211_supported_band *sband;
2749         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2750
2751         sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2752         lq_sta = &sta_priv->lq_sta;
2753         sband = hw->wiphy->bands[conf->chandef.chan->band];
2754
2755         lq_sta->lq.sta_id = sta_id;
2756
2757         for (j = 0; j < LQ_SIZE; j++)
2758                 for (i = 0; i < IWL_RATE_COUNT; i++)
2759                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2760
2761         lq_sta->flush_timer = 0;
2762         lq_sta->supp_rates = sta->deflink.supp_rates[sband->band];
2763
2764         IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2765                        sta_id);
2766         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2767          * the lowest or the highest rate.. Could consider using RSSI from
2768          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2769          * after assoc.. */
2770
2771         lq_sta->is_dup = 0;
2772         lq_sta->max_rate_idx = -1;
2773         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2774         lq_sta->is_green = rs_use_green(sta);
2775         lq_sta->band = sband->band;
2776         /*
2777          * active legacy rates as per supported rates bitmap
2778          */
2779         supp = sta->deflink.supp_rates[sband->band];
2780         lq_sta->active_legacy_rate = 0;
2781         for_each_set_bit(i, &supp, BITS_PER_LONG)
2782                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2783
2784         /*
2785          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2786          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2787          */
2788         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2789         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2790         lq_sta->active_siso_rate &= ~((u16)0x2);
2791         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2792
2793         /* Same here */
2794         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2795         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2796         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2797         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2798
2799         lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2800         lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2801         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2802         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2803
2804         IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2805                      lq_sta->active_siso_rate,
2806                      lq_sta->active_mimo2_rate,
2807                      lq_sta->active_mimo3_rate);
2808
2809         /* These values will be overridden later */
2810         lq_sta->lq.general_params.single_stream_ant_msk =
2811                 first_antenna(priv->nvm_data->valid_tx_ant);
2812         lq_sta->lq.general_params.dual_stream_ant_msk =
2813                 priv->nvm_data->valid_tx_ant &
2814                 ~first_antenna(priv->nvm_data->valid_tx_ant);
2815         if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2816                 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2817         } else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) {
2818                 lq_sta->lq.general_params.dual_stream_ant_msk =
2819                         priv->nvm_data->valid_tx_ant;
2820         }
2821
2822         /* as default allow aggregation for all tids */
2823         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2824         lq_sta->drv = priv;
2825
2826         /* Set last_txrate_idx to lowest rate */
2827         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2828         if (sband->band == NL80211_BAND_5GHZ)
2829                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2830         lq_sta->is_agg = 0;
2831 #ifdef CONFIG_MAC80211_DEBUGFS
2832         lq_sta->dbg_fixed_rate = 0;
2833 #endif
2834
2835         rs_initialize_lq(priv, sta, lq_sta);
2836 }
2837
2838 static void rs_fill_link_cmd(struct iwl_priv *priv,
2839                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2840 {
2841         struct iwl_scale_tbl_info tbl_type;
2842         int index = 0;
2843         int rate_idx;
2844         int repeat_rate = 0;
2845         u8 ant_toggle_cnt = 0;
2846         u8 use_ht_possible = 1;
2847         u8 valid_tx_ant = 0;
2848         struct iwl_station_priv *sta_priv =
2849                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2850         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2851
2852         /* Override starting rate (index 0) if needed for debug purposes */
2853         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2854
2855         /* Interpret new_rate (rate_n_flags) */
2856         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2857                                   &tbl_type, &rate_idx);
2858
2859         if (priv && priv->bt_full_concurrent) {
2860                 /* 1x1 only */
2861                 tbl_type.ant_type =
2862                         first_antenna(priv->nvm_data->valid_tx_ant);
2863         }
2864
2865         /* How many times should we repeat the initial rate? */
2866         if (is_legacy(tbl_type.lq_type)) {
2867                 ant_toggle_cnt = 1;
2868                 repeat_rate = IWL_NUMBER_TRY;
2869         } else {
2870                 repeat_rate = min(IWL_HT_NUMBER_TRY,
2871                                   LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2872         }
2873
2874         lq_cmd->general_params.mimo_delimiter =
2875                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2876
2877         /* Fill 1st table entry (index 0) */
2878         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2879
2880         if (num_of_ant(tbl_type.ant_type) == 1) {
2881                 lq_cmd->general_params.single_stream_ant_msk =
2882                                                 tbl_type.ant_type;
2883         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2884                 lq_cmd->general_params.dual_stream_ant_msk =
2885                                                 tbl_type.ant_type;
2886         } /* otherwise we don't modify the existing value */
2887
2888         index++;
2889         repeat_rate--;
2890         if (priv) {
2891                 if (priv->bt_full_concurrent)
2892                         valid_tx_ant = ANT_A;
2893                 else
2894                         valid_tx_ant = priv->nvm_data->valid_tx_ant;
2895         }
2896
2897         /* Fill rest of rate table */
2898         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2899                 /* Repeat initial/next rate.
2900                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2901                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2902                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2903                         if (is_legacy(tbl_type.lq_type)) {
2904                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2905                                         ant_toggle_cnt++;
2906                                 else if (priv &&
2907                                          rs_toggle_antenna(valid_tx_ant,
2908                                                         &new_rate, &tbl_type))
2909                                         ant_toggle_cnt = 1;
2910                         }
2911
2912                         /* Override next rate if needed for debug purposes */
2913                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2914
2915                         /* Fill next table entry */
2916                         lq_cmd->rs_table[index].rate_n_flags =
2917                                         cpu_to_le32(new_rate);
2918                         repeat_rate--;
2919                         index++;
2920                 }
2921
2922                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2923                                                 &rate_idx);
2924
2925                 if (priv && priv->bt_full_concurrent) {
2926                         /* 1x1 only */
2927                         tbl_type.ant_type =
2928                             first_antenna(priv->nvm_data->valid_tx_ant);
2929                 }
2930
2931                 /* Indicate to uCode which entries might be MIMO.
2932                  * If initial rate was MIMO, this will finally end up
2933                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2934                 if (is_mimo(tbl_type.lq_type))
2935                         lq_cmd->general_params.mimo_delimiter = index;
2936
2937                 /* Get next rate */
2938                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2939                                              use_ht_possible);
2940
2941                 /* How many times should we repeat the next rate? */
2942                 if (is_legacy(tbl_type.lq_type)) {
2943                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2944                                 ant_toggle_cnt++;
2945                         else if (priv &&
2946                                  rs_toggle_antenna(valid_tx_ant,
2947                                                    &new_rate, &tbl_type))
2948                                 ant_toggle_cnt = 1;
2949
2950                         repeat_rate = IWL_NUMBER_TRY;
2951                 } else {
2952                         repeat_rate = IWL_HT_NUMBER_TRY;
2953                 }
2954
2955                 /* Don't allow HT rates after next pass.
2956                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2957                 use_ht_possible = 0;
2958
2959                 /* Override next rate if needed for debug purposes */
2960                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2961
2962                 /* Fill next table entry */
2963                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2964
2965                 index++;
2966                 repeat_rate--;
2967         }
2968
2969         lq_cmd->agg_params.agg_frame_cnt_limit =
2970                 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2971         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2972
2973         lq_cmd->agg_params.agg_time_limit =
2974                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2975         /*
2976          * overwrite if needed, pass aggregation time limit
2977          * to uCode in uSec
2978          */
2979         if (priv && priv->lib->bt_params &&
2980             priv->lib->bt_params->agg_time_limit &&
2981             priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
2982                 lq_cmd->agg_params.agg_time_limit =
2983                         cpu_to_le16(priv->lib->bt_params->agg_time_limit);
2984 }
2985
2986 static void *rs_alloc(struct ieee80211_hw *hw)
2987 {
2988         return hw->priv;
2989 }
2990 /* rate scale requires free function to be implemented */
2991 static void rs_free(void *priv_rate)
2992 {
2993         return;
2994 }
2995
2996 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2997                         void *priv_sta)
2998 {
2999         struct iwl_op_mode *op_mode __maybe_unused = priv_r;
3000         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
3001
3002         IWL_DEBUG_RATE(priv, "enter\n");
3003         IWL_DEBUG_RATE(priv, "leave\n");
3004 }
3005
3006 #ifdef CONFIG_MAC80211_DEBUGFS
3007 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3008                              u32 *rate_n_flags, int index)
3009 {
3010         struct iwl_priv *priv;
3011         u8 valid_tx_ant;
3012         u8 ant_sel_tx;
3013
3014         priv = lq_sta->drv;
3015         valid_tx_ant = priv->nvm_data->valid_tx_ant;
3016         if (lq_sta->dbg_fixed_rate) {
3017                 ant_sel_tx =
3018                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3019                   >> RATE_MCS_ANT_POS);
3020                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3021                         *rate_n_flags = lq_sta->dbg_fixed_rate;
3022                         IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3023                 } else {
3024                         lq_sta->dbg_fixed_rate = 0;
3025                         IWL_ERR(priv,
3026                             "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3027                             ant_sel_tx, valid_tx_ant);
3028                         IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3029                 }
3030         } else {
3031                 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3032         }
3033 }
3034
3035 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3036                         const char __user *user_buf, size_t count, loff_t *ppos)
3037 {
3038         struct iwl_lq_sta *lq_sta = file->private_data;
3039         struct iwl_priv *priv;
3040         char buf[64];
3041         size_t buf_size;
3042         u32 parsed_rate;
3043
3044
3045         priv = lq_sta->drv;
3046         memset(buf, 0, sizeof(buf));
3047         buf_size = min(count, sizeof(buf) -  1);
3048         if (copy_from_user(buf, user_buf, buf_size))
3049                 return -EFAULT;
3050
3051         if (sscanf(buf, "%x", &parsed_rate) == 1)
3052                 lq_sta->dbg_fixed_rate = parsed_rate;
3053         else
3054                 lq_sta->dbg_fixed_rate = 0;
3055
3056         rs_program_fix_rate(priv, lq_sta);
3057
3058         return count;
3059 }
3060
3061 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3062                         char __user *user_buf, size_t count, loff_t *ppos)
3063 {
3064         char *buff;
3065         int desc = 0;
3066         int i = 0;
3067         int index = 0;
3068         ssize_t ret;
3069
3070         /* mbps, mcs */
3071         static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
3072                 {  "1", "BPSK DSSS"},
3073                 {  "2", "QPSK DSSS"},
3074                 {"5.5", "BPSK CCK"},
3075                 { "11", "QPSK CCK"},
3076                 {  "6", "BPSK 1/2"},
3077                 {  "9", "BPSK 1/2"},
3078                 { "12", "QPSK 1/2"},
3079                 { "18", "QPSK 3/4"},
3080                 { "24", "16QAM 1/2"},
3081                 { "36", "16QAM 3/4"},
3082                 { "48", "64QAM 2/3"},
3083                 { "54", "64QAM 3/4"},
3084                 { "60", "64QAM 5/6"},
3085         };
3086
3087         struct iwl_lq_sta *lq_sta = file->private_data;
3088         struct iwl_priv *priv;
3089         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3090
3091         priv = lq_sta->drv;
3092         buff = kmalloc(1024, GFP_KERNEL);
3093         if (!buff)
3094                 return -ENOMEM;
3095
3096         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3097         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3098                         lq_sta->total_failed, lq_sta->total_success,
3099                         lq_sta->active_legacy_rate);
3100         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3101                         lq_sta->dbg_fixed_rate);
3102         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3103             (priv->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3104             (priv->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3105             (priv->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3106         desc += sprintf(buff+desc, "lq type %s\n",
3107            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3108         if (is_Ht(tbl->lq_type)) {
3109                 desc += sprintf(buff + desc, " %s",
3110                    (is_siso(tbl->lq_type)) ? "SISO" :
3111                    ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3112                 desc += sprintf(buff + desc, " %s",
3113                    (tbl->is_ht40) ? "40MHz" : "20MHz");
3114                 desc += sprintf(buff + desc, " %s %s %s\n",
3115                    (tbl->is_SGI) ? "SGI" : "",
3116                    (lq_sta->is_green) ? "GF enabled" : "",
3117                    (lq_sta->is_agg) ? "AGG on" : "");
3118         }
3119         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3120                 lq_sta->last_rate_n_flags);
3121         desc += sprintf(buff+desc, "general:"
3122                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3123                 lq_sta->lq.general_params.flags,
3124                 lq_sta->lq.general_params.mimo_delimiter,
3125                 lq_sta->lq.general_params.single_stream_ant_msk,
3126                 lq_sta->lq.general_params.dual_stream_ant_msk);
3127
3128         desc += sprintf(buff+desc, "agg:"
3129                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3130                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3131                         lq_sta->lq.agg_params.agg_dis_start_th,
3132                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
3133
3134         desc += sprintf(buff+desc,
3135                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3136                         lq_sta->lq.general_params.start_rate_index[0],
3137                         lq_sta->lq.general_params.start_rate_index[1],
3138                         lq_sta->lq.general_params.start_rate_index[2],
3139                         lq_sta->lq.general_params.start_rate_index[3]);
3140
3141         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3142                 index = iwl_hwrate_to_plcp_idx(
3143                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3144                 if (index == IWL_RATE_INVALID) {
3145                         desc += sprintf(buff + desc, " rate[%d] 0x%X invalid rate\n",
3146                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3147                 } else if (is_legacy(tbl->lq_type)) {
3148                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3149                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3150                                 iwl_rate_mcs[index].mbps);
3151                 } else {
3152                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3153                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3154                                 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3155                 }
3156         }
3157
3158         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3159         kfree(buff);
3160         return ret;
3161 }
3162
3163 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3164         .write = rs_sta_dbgfs_scale_table_write,
3165         .read = rs_sta_dbgfs_scale_table_read,
3166         .open = simple_open,
3167         .llseek = default_llseek,
3168 };
3169 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3170                         char __user *user_buf, size_t count, loff_t *ppos)
3171 {
3172         char *buff;
3173         int desc = 0;
3174         int i, j;
3175         ssize_t ret;
3176
3177         struct iwl_lq_sta *lq_sta = file->private_data;
3178
3179         buff = kmalloc(1024, GFP_KERNEL);
3180         if (!buff)
3181                 return -ENOMEM;
3182
3183         for (i = 0; i < LQ_SIZE; i++) {
3184                 desc += sprintf(buff+desc,
3185                                 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3186                                 "rate=0x%X\n",
3187                                 lq_sta->active_tbl == i ? "*" : "x",
3188                                 lq_sta->lq_info[i].lq_type,
3189                                 lq_sta->lq_info[i].is_SGI,
3190                                 lq_sta->lq_info[i].is_ht40,
3191                                 lq_sta->lq_info[i].is_dup,
3192                                 lq_sta->is_green,
3193                                 lq_sta->lq_info[i].current_rate);
3194                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3195                         desc += sprintf(buff+desc,
3196                                 "counter=%d success=%d %%=%d\n",
3197                                 lq_sta->lq_info[i].win[j].counter,
3198                                 lq_sta->lq_info[i].win[j].success_counter,
3199                                 lq_sta->lq_info[i].win[j].success_ratio);
3200                 }
3201         }
3202         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3203         kfree(buff);
3204         return ret;
3205 }
3206
3207 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3208         .read = rs_sta_dbgfs_stats_table_read,
3209         .open = simple_open,
3210         .llseek = default_llseek,
3211 };
3212
3213 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3214                         char __user *user_buf, size_t count, loff_t *ppos)
3215 {
3216         struct iwl_lq_sta *lq_sta = file->private_data;
3217         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3218         char buff[120];
3219         int desc = 0;
3220
3221         if (is_Ht(tbl->lq_type))
3222                 desc += sprintf(buff+desc,
3223                                 "Bit Rate= %d Mb/s\n",
3224                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3225         else
3226                 desc += sprintf(buff+desc,
3227                                 "Bit Rate= %d Mb/s\n",
3228                                 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3229
3230         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3231 }
3232
3233 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3234         .read = rs_sta_dbgfs_rate_scale_data_read,
3235         .open = simple_open,
3236         .llseek = default_llseek,
3237 };
3238
3239 static void rs_add_debugfs(void *priv, void *priv_sta,
3240                                         struct dentry *dir)
3241 {
3242         struct iwl_lq_sta *lq_sta = priv_sta;
3243
3244         debugfs_create_file("rate_scale_table", 0600, dir, lq_sta,
3245                             &rs_sta_dbgfs_scale_table_ops);
3246         debugfs_create_file("rate_stats_table", 0400, dir, lq_sta,
3247                             &rs_sta_dbgfs_stats_table_ops);
3248         debugfs_create_file("rate_scale_data", 0400, dir, lq_sta,
3249                             &rs_sta_dbgfs_rate_scale_data_ops);
3250         debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
3251                           &lq_sta->tx_agg_tid_en);
3252
3253 }
3254 #endif
3255
3256 /*
3257  * Initialization of rate scaling information is done by driver after
3258  * the station is added. Since mac80211 calls this function before a
3259  * station is added we ignore it.
3260  */
3261 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3262                               struct cfg80211_chan_def *chandef,
3263                               struct ieee80211_sta *sta, void *priv_sta)
3264 {
3265 }
3266
3267 static const struct rate_control_ops rs_ops = {
3268         .name = RS_NAME,
3269         .tx_status = rs_tx_status,
3270         .get_rate = rs_get_rate,
3271         .rate_init = rs_rate_init_stub,
3272         .alloc = rs_alloc,
3273         .free = rs_free,
3274         .alloc_sta = rs_alloc_sta,
3275         .free_sta = rs_free_sta,
3276 #ifdef CONFIG_MAC80211_DEBUGFS
3277         .add_sta_debugfs = rs_add_debugfs,
3278 #endif
3279 };
3280
3281 int iwlagn_rate_control_register(void)
3282 {
3283         return ieee80211_rate_control_register(&rs_ops);
3284 }
3285
3286 void iwlagn_rate_control_unregister(void)
3287 {
3288         ieee80211_rate_control_unregister(&rs_ops);
3289 }
3290