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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2013 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/slab.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37 #include "rs.h"
  38 #include "fw-api.h"
  39 #include "sta.h"
  40 #include "iwl-op-mode.h"
  41 #include "mvm.h"
  42
  43 #define RS_NAME "iwl-mvm-rs"
  44
  45 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  46 #define IWL_NUMBER_TRY      1
  47 #define IWL_HT_NUMBER_TRY   3
  48
  49 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  50 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  51 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  52
  53 /* max allowed rate miss before sync LQ cmd */
  54 #define IWL_MISSED_RATE_MAX             15
  55 /* max time to accum history 2 seconds */
  56 #define IWL_RATE_SCALE_FLUSH_INTVL   (3*HZ)
  57
  58 static u8 rs_ht_to_legacy[] = {
  59         [IWL_RATE_1M_INDEX] = IWL_RATE_6M_INDEX,
  60         [IWL_RATE_2M_INDEX] = IWL_RATE_6M_INDEX,
  61         [IWL_RATE_5M_INDEX] = IWL_RATE_6M_INDEX,
  62         [IWL_RATE_11M_INDEX] = IWL_RATE_6M_INDEX,
  63         [IWL_RATE_6M_INDEX] = IWL_RATE_6M_INDEX,
  64         [IWL_RATE_9M_INDEX] = IWL_RATE_6M_INDEX,
  65         [IWL_RATE_12M_INDEX] = IWL_RATE_9M_INDEX,
  66         [IWL_RATE_18M_INDEX] = IWL_RATE_12M_INDEX,
  67         [IWL_RATE_24M_INDEX] = IWL_RATE_18M_INDEX,
  68         [IWL_RATE_36M_INDEX] = IWL_RATE_24M_INDEX,
  69         [IWL_RATE_48M_INDEX] = IWL_RATE_36M_INDEX,
  70         [IWL_RATE_54M_INDEX] = IWL_RATE_48M_INDEX,
  71         [IWL_RATE_60M_INDEX] = IWL_RATE_54M_INDEX,
  72 };
  73
  74 static const u8 ant_toggle_lookup[] = {
  75         [ANT_NONE] = ANT_NONE,
  76         [ANT_A] = ANT_B,
  77         [ANT_B] = ANT_C,
  78         [ANT_AB] = ANT_BC,
  79         [ANT_C] = ANT_A,
  80         [ANT_AC] = ANT_AB,
  81         [ANT_BC] = ANT_AC,
  82         [ANT_ABC] = ANT_ABC,
  83 };
  84
  85 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                    \
  86         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
  87                                     IWL_RATE_SISO_##s##M_PLCP, \
  88                                     IWL_RATE_MIMO2_##s##M_PLCP,\
  89                                     IWL_RATE_##rp##M_INDEX,    \
  90                                     IWL_RATE_##rn##M_INDEX }
  91
  92 /*
  93  * Parameter order:
  94  *   rate, ht rate, prev rate, next rate
  95  *
  96  * If there isn't a valid next or previous rate then INV is used which
  97  * maps to IWL_RATE_INVALID
  98  *
  99  */
 100 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 101         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 102         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 103         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 104         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 105         IWL_DECLARE_RATE_INFO(6, 6, 5, 11),      /*  6mbps */
 106         IWL_DECLARE_RATE_INFO(9, 6, 6, 11),      /*  9mbps */
 107         IWL_DECLARE_RATE_INFO(12, 12, 11, 18),   /* 12mbps */
 108         IWL_DECLARE_RATE_INFO(18, 18, 12, 24),   /* 18mbps */
 109         IWL_DECLARE_RATE_INFO(24, 24, 18, 36),   /* 24mbps */
 110         IWL_DECLARE_RATE_INFO(36, 36, 24, 48),   /* 36mbps */
 111         IWL_DECLARE_RATE_INFO(48, 48, 36, 54),   /* 48mbps */
 112         IWL_DECLARE_RATE_INFO(54, 54, 48, INV),  /* 54mbps */
 113         IWL_DECLARE_RATE_INFO(60, 60, 48, INV),  /* 60mbps */
 114         /* FIXME:RS:          ^^    should be INV (legacy) */
 115 };
 116
 117 static inline u8 rs_extract_rate(u32 rate_n_flags)
 118 {
 119         /* also works for HT because bits 7:6 are zero there */
 120         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 121 }
 122
 123 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 124 {
 125         int idx = 0;
 126
 127         /* HT rate format */
 128         if (rate_n_flags & RATE_MCS_HT_MSK) {
 129                 idx = rs_extract_rate(rate_n_flags);
 130
 131                 WARN_ON_ONCE(idx >= IWL_RATE_MIMO3_6M_PLCP);
 132                 if (idx >= IWL_RATE_MIMO2_6M_PLCP)
 133                         idx = idx - IWL_RATE_MIMO2_6M_PLCP;
 134
 135                 idx += IWL_FIRST_OFDM_RATE;
 136                 /* skip 9M not supported in ht*/
 137                 if (idx >= IWL_RATE_9M_INDEX)
 138                         idx += 1;
 139                 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
 140                         return idx;
 141
 142         /* legacy rate format, search for match in table */
 143         } else {
 144                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 145                         if (iwl_rates[idx].plcp ==
 146                                         rs_extract_rate(rate_n_flags))
 147                                 return idx;
 148         }
 149
 150         return -1;
 151 }
 152
 153 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 154                                    struct sk_buff *skb,
 155                                    struct ieee80211_sta *sta,
 156                                    struct iwl_lq_sta *lq_sta);
 157 static void rs_fill_link_cmd(struct iwl_mvm *mvm,
 158                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 159 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 160
 161
 162 #ifdef CONFIG_MAC80211_DEBUGFS
 163 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 164                              u32 *rate_n_flags);
 165 #else
 166 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 167                              u32 *rate_n_flags)
 168 {}
 169 #endif
 170
 171 /**
 172  * The following tables contain the expected throughput metrics for all rates
 173  *
 174  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 175  *
 176  * where invalid entries are zeros.
 177  *
 178  * CCK rates are only valid in legacy table and will only be used in G
 179  * (2.4 GHz) band.
 180  */
 181
 182 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
 183         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 184 };
 185
 186 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
 187         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202}, /* Norm */
 188         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210}, /* SGI */
 189         {0, 0, 0, 0, 47, 0,  91, 133, 171, 242, 305, 334, 362}, /* AGG */
 190         {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
 191 };
 192
 193 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
 194         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 195         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 196         {0, 0, 0, 0,  94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
 197         {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
 198 };
 199
 200 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 201         {0, 0, 0, 0,  74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
 202         {0, 0, 0, 0,  81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
 203         {0, 0, 0, 0,  89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
 204         {0, 0, 0, 0,  97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
 205 };
 206
 207 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 208         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
 209         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
 210         {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
 211         {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
 212 };
 213
 214 /* mbps, mcs */
 215 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 216         {  "1", "BPSK DSSS"},
 217         {  "2", "QPSK DSSS"},
 218         {"5.5", "BPSK CCK"},
 219         { "11", "QPSK CCK"},
 220         {  "6", "BPSK 1/2"},
 221         {  "9", "BPSK 1/2"},
 222         { "12", "QPSK 1/2"},
 223         { "18", "QPSK 3/4"},
 224         { "24", "16QAM 1/2"},
 225         { "36", "16QAM 3/4"},
 226         { "48", "64QAM 2/3"},
 227         { "54", "64QAM 3/4"},
 228         { "60", "64QAM 5/6"},
 229 };
 230
 231 #define MCS_INDEX_PER_STREAM    (8)
 232
 233 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 234 {
 235         window->data = 0;
 236         window->success_counter = 0;
 237         window->success_ratio = IWL_INVALID_VALUE;
 238         window->counter = 0;
 239         window->average_tpt = IWL_INVALID_VALUE;
 240         window->stamp = 0;
 241 }
 242
 243 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 244 {
 245         return (ant_type & valid_antenna) == ant_type;
 246 }
 247
 248 #ifdef CONFIG_MAC80211_DEBUGFS
 249 /**
 250  * Program the device to use fixed rate for frame transmit
 251  * This is for debugging/testing only
 252  * once the device start use fixed rate, we need to reload the module
 253  * to being back the normal operation.
 254  */
 255 static void rs_program_fix_rate(struct iwl_mvm *mvm,
 256                                 struct iwl_lq_sta *lq_sta)
 257 {
 258         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
 259         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 260         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 261
 262         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
 263                        lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
 264
 265         if (lq_sta->dbg_fixed_rate) {
 266                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
 267                 iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
 268         }
 269 }
 270 #endif
 271
 272 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 273                                       struct iwl_lq_sta *lq_data, u8 tid,
 274                                       struct ieee80211_sta *sta)
 275 {
 276         int ret = -EAGAIN;
 277
 278         /*
 279          * Don't create TX aggregation sessions when in high
 280          * BT traffic, as they would just be disrupted by BT.
 281          */
 282         if (BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD) >= 2) {
 283                 IWL_DEBUG_COEX(mvm, "BT traffic (%d), no aggregation allowed\n",
 284                                BT_MBOX_MSG(&mvm->last_bt_notif,
 285                                            3, TRAFFIC_LOAD));
 286                 return ret;
 287         }
 288
 289         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 290                      sta->addr, tid);
 291         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 292         if (ret == -EAGAIN) {
 293                 /*
 294                  * driver and mac80211 is out of sync
 295                  * this might be cause by reloading firmware
 296                  * stop the tx ba session here
 297                  */
 298                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 299                         tid);
 300                 ieee80211_stop_tx_ba_session(sta, tid);
 301         }
 302         return ret;
 303 }
 304
 305 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 306                               struct iwl_lq_sta *lq_data,
 307                               struct ieee80211_sta *sta)
 308 {
 309         if (tid < IWL_MAX_TID_COUNT)
 310                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 311         else
 312                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 313                         tid, IWL_MAX_TID_COUNT);
 314 }
 315
 316 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 317 {
 318         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 319                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 320                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 321 }
 322
 323 /*
 324  * Static function to get the expected throughput from an iwl_scale_tbl_info
 325  * that wraps a NULL pointer check
 326  */
 327 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 328 {
 329         if (tbl->expected_tpt)
 330                 return tbl->expected_tpt[rs_index];
 331         return 0;
 332 }
 333
 334 /**
 335  * rs_collect_tx_data - Update the success/failure sliding window
 336  *
 337  * We keep a sliding window of the last 62 packets transmitted
 338  * at this rate.  window->data contains the bitmask of successful
 339  * packets.
 340  */
 341 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 342                               int scale_index, int attempts, int successes)
 343 {
 344         struct iwl_rate_scale_data *window = NULL;
 345         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 346         s32 fail_count, tpt;
 347
 348         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 349                 return -EINVAL;
 350
 351         /* Select window for current tx bit rate */
 352         window = &(tbl->win[scale_index]);
 353
 354         /* Get expected throughput */
 355         tpt = get_expected_tpt(tbl, scale_index);
 356
 357         /*
 358          * Keep track of only the latest 62 tx frame attempts in this rate's
 359          * history window; anything older isn't really relevant any more.
 360          * If we have filled up the sliding window, drop the oldest attempt;
 361          * if the oldest attempt (highest bit in bitmap) shows "success",
 362          * subtract "1" from the success counter (this is the main reason
 363          * we keep these bitmaps!).
 364          */
 365         while (attempts > 0) {
 366                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 367                         /* remove earliest */
 368                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 369
 370                         if (window->data & mask) {
 371                                 window->data &= ~mask;
 372                                 window->success_counter--;
 373                         }
 374                 }
 375
 376                 /* Increment frames-attempted counter */
 377                 window->counter++;
 378
 379                 /* Shift bitmap by one frame to throw away oldest history */
 380                 window->data <<= 1;
 381
 382                 /* Mark the most recent #successes attempts as successful */
 383                 if (successes > 0) {
 384                         window->success_counter++;
 385                         window->data |= 0x1;
 386                         successes--;
 387                 }
 388
 389                 attempts--;
 390         }
 391
 392         /* Calculate current success ratio, avoid divide-by-0! */
 393         if (window->counter > 0)
 394                 window->success_ratio = 128 * (100 * window->success_counter)
 395                                         / window->counter;
 396         else
 397                 window->success_ratio = IWL_INVALID_VALUE;
 398
 399         fail_count = window->counter - window->success_counter;
 400
 401         /* Calculate average throughput, if we have enough history. */
 402         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 403             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 404                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 405         else
 406                 window->average_tpt = IWL_INVALID_VALUE;
 407
 408         /* Tag this window as having been updated */
 409         window->stamp = jiffies;
 410
 411         return 0;
 412 }
 413
 414 /*
 415  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 416  */
 417 /* FIXME:RS:remove this function and put the flags statically in the table */
 418 static u32 rate_n_flags_from_tbl(struct iwl_mvm *mvm,
 419                                  struct iwl_scale_tbl_info *tbl,
 420                                  int index, u8 use_green)
 421 {
 422         u32 rate_n_flags = 0;
 423
 424         if (is_legacy(tbl->lq_type)) {
 425                 rate_n_flags = iwl_rates[index].plcp;
 426                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 427                         rate_n_flags |= RATE_MCS_CCK_MSK;
 428         } else if (is_Ht(tbl->lq_type)) {
 429                 if (index > IWL_LAST_OFDM_RATE) {
 430                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 431                         index = IWL_LAST_OFDM_RATE;
 432                 }
 433                 rate_n_flags = RATE_MCS_HT_MSK;
 434
 435                 if (is_siso(tbl->lq_type))
 436                         rate_n_flags |= iwl_rates[index].plcp_siso;
 437                 else if (is_mimo2(tbl->lq_type))
 438                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 439                 else
 440                         WARN_ON_ONCE(1);
 441         } else {
 442                 IWL_ERR(mvm, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 443         }
 444
 445         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 446                                                      RATE_MCS_ANT_ABC_MSK);
 447
 448         if (is_Ht(tbl->lq_type)) {
 449                 if (tbl->is_ht40)
 450                         rate_n_flags |= RATE_MCS_CHAN_WIDTH_40;
 451                 if (tbl->is_SGI)
 452                         rate_n_flags |= RATE_MCS_SGI_MSK;
 453
 454                 if (use_green) {
 455                         rate_n_flags |= RATE_HT_MCS_GF_MSK;
 456                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 457                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 458                                 IWL_ERR(mvm, "GF was set with SGI:SISO\n");
 459                         }
 460                 }
 461         }
 462         return rate_n_flags;
 463 }
 464
 465 /*
 466  * Interpret uCode API's rate_n_flags format,
 467  * fill "search" or "active" tx mode table.
 468  */
 469 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 470                                     enum ieee80211_band band,
 471                                     struct iwl_scale_tbl_info *tbl,
 472                                     int *rate_idx)
 473 {
 474         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 475         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 476         u8 mcs;
 477
 478         memset(tbl, 0, offsetof(struct iwl_scale_tbl_info, win));
 479         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 480
 481         if (*rate_idx  == IWL_RATE_INVALID) {
 482                 *rate_idx = -1;
 483                 return -EINVAL;
 484         }
 485         tbl->is_SGI = 0;        /* default legacy setup */
 486         tbl->is_ht40 = 0;
 487         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 488         tbl->lq_type = LQ_NONE;
 489         tbl->max_search = IWL_MAX_SEARCH;
 490
 491         /* legacy rate format */
 492         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 493                 if (num_of_ant == 1) {
 494                         if (band == IEEE80211_BAND_5GHZ)
 495                                 tbl->lq_type = LQ_A;
 496                         else
 497                                 tbl->lq_type = LQ_G;
 498                 }
 499         /* HT rate format */
 500         } else {
 501                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 502                         tbl->is_SGI = 1;
 503
 504                 if (rate_n_flags & RATE_MCS_CHAN_WIDTH_40) /* TODO */
 505                         tbl->is_ht40 = 1;
 506
 507                 mcs = rs_extract_rate(rate_n_flags);
 508
 509                 /* SISO */
 510                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 511                         if (num_of_ant == 1)
 512                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 513                 /* MIMO2 */
 514                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 515                         if (num_of_ant == 2)
 516                                 tbl->lq_type = LQ_MIMO2;
 517                 } else {
 518                         WARN_ON_ONCE(num_of_ant == 3);
 519                 }
 520         }
 521         return 0;
 522 }
 523
 524 /* switch to another antenna/antennas and return 1 */
 525 /* if no other valid antenna found, return 0 */
 526 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 527                              struct iwl_scale_tbl_info *tbl)
 528 {
 529         u8 new_ant_type;
 530
 531         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 532                 return 0;
 533
 534         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 535                 return 0;
 536
 537         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 538
 539         while ((new_ant_type != tbl->ant_type) &&
 540                !rs_is_valid_ant(valid_ant, new_ant_type))
 541                 new_ant_type = ant_toggle_lookup[new_ant_type];
 542
 543         if (new_ant_type == tbl->ant_type)
 544                 return 0;
 545
 546         tbl->ant_type = new_ant_type;
 547         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 548         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 549         return 1;
 550 }
 551
 552 /**
 553  * Green-field mode is valid if the station supports it and
 554  * there are no non-GF stations present in the BSS.
 555  */
 556 static bool rs_use_green(struct ieee80211_sta *sta)
 557 {
 558         /*
 559          * There's a bug somewhere in this code that causes the
 560          * scaling to get stuck because GF+SGI can't be combined
 561          * in SISO rates. Until we find that bug, disable GF, it
 562          * has only limited benefit and we still interoperate with
 563          * GF APs since we can always receive GF transmissions.
 564          */
 565         return false;
 566 }
 567
 568 /**
 569  * rs_get_supported_rates - get the available rates
 570  *
 571  * if management frame or broadcast frame only return
 572  * basic available rates.
 573  *
 574  */
 575 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 576                                   struct ieee80211_hdr *hdr,
 577                                   enum iwl_table_type rate_type)
 578 {
 579         if (is_legacy(rate_type)) {
 580                 return lq_sta->active_legacy_rate;
 581         } else {
 582                 if (is_siso(rate_type))
 583                         return lq_sta->active_siso_rate;
 584                 else {
 585                         WARN_ON_ONCE(!is_mimo2(rate_type));
 586                         return lq_sta->active_mimo2_rate;
 587                 }
 588         }
 589 }
 590
 591 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 592                                 int rate_type)
 593 {
 594         u8 high = IWL_RATE_INVALID;
 595         u8 low = IWL_RATE_INVALID;
 596
 597         /* 802.11A or ht walks to the next literal adjacent rate in
 598          * the rate table */
 599         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 600                 int i;
 601                 u32 mask;
 602
 603                 /* Find the previous rate that is in the rate mask */
 604                 i = index - 1;
 605                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 606                         if (rate_mask & mask) {
 607                                 low = i;
 608                                 break;
 609                         }
 610                 }
 611
 612                 /* Find the next rate that is in the rate mask */
 613                 i = index + 1;
 614                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 615                         if (rate_mask & mask) {
 616                                 high = i;
 617                                 break;
 618                         }
 619                 }
 620
 621                 return (high << 8) | low;
 622         }
 623
 624         low = index;
 625         while (low != IWL_RATE_INVALID) {
 626                 low = iwl_rates[low].prev_rs;
 627                 if (low == IWL_RATE_INVALID)
 628                         break;
 629                 if (rate_mask & (1 << low))
 630                         break;
 631                 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
 632         }
 633
 634         high = index;
 635         while (high != IWL_RATE_INVALID) {
 636                 high = iwl_rates[high].next_rs;
 637                 if (high == IWL_RATE_INVALID)
 638                         break;
 639                 if (rate_mask & (1 << high))
 640                         break;
 641                 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
 642         }
 643
 644         return (high << 8) | low;
 645 }
 646
 647 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 648                              struct iwl_scale_tbl_info *tbl,
 649                              u8 scale_index, u8 ht_possible)
 650 {
 651         s32 low;
 652         u16 rate_mask;
 653         u16 high_low;
 654         u8 switch_to_legacy = 0;
 655         u8 is_green = lq_sta->is_green;
 656         struct iwl_mvm *mvm = lq_sta->drv;
 657
 658         /* check if we need to switch from HT to legacy rates.
 659          * assumption is that mandatory rates (1Mbps or 6Mbps)
 660          * are always supported (spec demand) */
 661         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 662                 switch_to_legacy = 1;
 663                 scale_index = rs_ht_to_legacy[scale_index];
 664                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 665                         tbl->lq_type = LQ_A;
 666                 else
 667                         tbl->lq_type = LQ_G;
 668
 669                 if (num_of_ant(tbl->ant_type) > 1)
 670                         tbl->ant_type =
 671                             first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
 672
 673                 tbl->is_ht40 = 0;
 674                 tbl->is_SGI = 0;
 675                 tbl->max_search = IWL_MAX_SEARCH;
 676         }
 677
 678         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 679
 680         /* Mask with station rate restriction */
 681         if (is_legacy(tbl->lq_type)) {
 682                 /* supp_rates has no CCK bits in A mode */
 683                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 684                         rate_mask  = (u16)(rate_mask &
 685                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 686                 else
 687                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 688         }
 689
 690         /* If we switched from HT to legacy, check current rate */
 691         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 692                 low = scale_index;
 693                 goto out;
 694         }
 695
 696         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 697                                         tbl->lq_type);
 698         low = high_low & 0xff;
 699
 700         if (low == IWL_RATE_INVALID)
 701                 low = scale_index;
 702
 703 out:
 704         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 705 }
 706
 707 /*
 708  * Simple function to compare two rate scale table types
 709  */
 710 static bool table_type_matches(struct iwl_scale_tbl_info *a,
 711                                struct iwl_scale_tbl_info *b)
 712 {
 713         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 714                 (a->is_SGI == b->is_SGI);
 715 }
 716
 717 /*
 718  * mac80211 sends us Tx status
 719  */
 720 static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
 721                          struct ieee80211_sta *sta, void *priv_sta,
 722                          struct sk_buff *skb)
 723 {
 724         int legacy_success;
 725         int retries;
 726         int rs_index, mac_index, i;
 727         struct iwl_lq_sta *lq_sta = priv_sta;
 728         struct iwl_lq_cmd *table;
 729         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 730         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
 731         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 732         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 733         enum mac80211_rate_control_flags mac_flags;
 734         u32 tx_rate;
 735         struct iwl_scale_tbl_info tbl_type;
 736         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 737
 738         IWL_DEBUG_RATE_LIMIT(mvm,
 739                              "get frame ack response, update rate scale window\n");
 740
 741         /* Treat uninitialized rate scaling data same as non-existing. */
 742         if (!lq_sta) {
 743                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
 744                 return;
 745         } else if (!lq_sta->drv) {
 746                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
 747                 return;
 748         }
 749
 750         if (!ieee80211_is_data(hdr->frame_control) ||
 751             info->flags & IEEE80211_TX_CTL_NO_ACK)
 752                 return;
 753
 754         /* This packet was aggregated but doesn't carry status info */
 755         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 756             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 757                 return;
 758
 759         /*
 760          * Ignore this Tx frame response if its initial rate doesn't match
 761          * that of latest Link Quality command.  There may be stragglers
 762          * from a previous Link Quality command, but we're no longer interested
 763          * in those; they're either from the "active" mode while we're trying
 764          * to check "search" mode, or a prior "search" mode after we've moved
 765          * to a new "search" mode (which might become the new "active" mode).
 766          */
 767         table = &lq_sta->lq;
 768         tx_rate = le32_to_cpu(table->rs_table[0]);
 769         rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type, &rs_index);
 770         if (info->band == IEEE80211_BAND_5GHZ)
 771                 rs_index -= IWL_FIRST_OFDM_RATE;
 772         mac_flags = info->status.rates[0].flags;
 773         mac_index = info->status.rates[0].idx;
 774         /* For HT packets, map MCS to PLCP */
 775         if (mac_flags & IEEE80211_TX_RC_MCS) {
 776                 /* Remove # of streams */
 777                 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
 778                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 779                         mac_index++;
 780                 /*
 781                  * mac80211 HT index is always zero-indexed; we need to move
 782                  * HT OFDM rates after CCK rates in 2.4 GHz band
 783                  */
 784                 if (info->band == IEEE80211_BAND_2GHZ)
 785                         mac_index += IWL_FIRST_OFDM_RATE;
 786         }
 787         /* Here we actually compare this rate to the latest LQ command */
 788         if ((mac_index < 0) ||
 789             (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 790             (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 791             (tbl_type.ant_type != info->status.antenna) ||
 792             (!!(tx_rate & RATE_MCS_HT_MSK) !=
 793                                 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 794             (!!(tx_rate & RATE_HT_MCS_GF_MSK) !=
 795                                 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 796             (rs_index != mac_index)) {
 797                 IWL_DEBUG_RATE(mvm,
 798                                "initial rate %d does not match %d (0x%x)\n",
 799                                mac_index, rs_index, tx_rate);
 800                 /*
 801                  * Since rates mis-match, the last LQ command may have failed.
 802                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 803                  * ... driver.
 804                  */
 805                 lq_sta->missed_rate_counter++;
 806                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 807                         lq_sta->missed_rate_counter = 0;
 808                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
 809                 }
 810                 /* Regardless, ignore this status info for outdated rate */
 811                 return;
 812         } else
 813                 /* Rate did match, so reset the missed_rate_counter */
 814                 lq_sta->missed_rate_counter = 0;
 815
 816         /* Figure out if rate scale algorithm is in active or search table */
 817         if (table_type_matches(&tbl_type,
 818                                &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 819                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 820                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 821         } else if (table_type_matches(
 822                         &tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
 823                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 824                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 825         } else {
 826                 IWL_DEBUG_RATE(mvm,
 827                                "Neither active nor search matches tx rate\n");
 828                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 829                 IWL_DEBUG_RATE(mvm, "active- lq:%x, ant:%x, SGI:%d\n",
 830                                tmp_tbl->lq_type, tmp_tbl->ant_type,
 831                                tmp_tbl->is_SGI);
 832                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 833                 IWL_DEBUG_RATE(mvm, "search- lq:%x, ant:%x, SGI:%d\n",
 834                                tmp_tbl->lq_type, tmp_tbl->ant_type,
 835                                tmp_tbl->is_SGI);
 836                 IWL_DEBUG_RATE(mvm, "actual- lq:%x, ant:%x, SGI:%d\n",
 837                                tbl_type.lq_type, tbl_type.ant_type,
 838                                tbl_type.is_SGI);
 839                 /*
 840                  * no matching table found, let's by-pass the data collection
 841                  * and continue to perform rate scale to find the rate table
 842                  */
 843                 rs_stay_in_table(lq_sta, true);
 844                 goto done;
 845         }
 846
 847         /*
 848          * Updating the frame history depends on whether packets were
 849          * aggregated.
 850          *
 851          * For aggregation, all packets were transmitted at the same rate, the
 852          * first index into rate scale table.
 853          */
 854         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
 855                 tx_rate = le32_to_cpu(table->rs_table[0]);
 856                 rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type,
 857                                          &rs_index);
 858                 rs_collect_tx_data(curr_tbl, rs_index,
 859                                    info->status.ampdu_len,
 860                                    info->status.ampdu_ack_len);
 861
 862                 /* Update success/fail counts if not searching for new mode */
 863                 if (lq_sta->stay_in_tbl) {
 864                         lq_sta->total_success += info->status.ampdu_ack_len;
 865                         lq_sta->total_failed += (info->status.ampdu_len -
 866                                         info->status.ampdu_ack_len);
 867                 }
 868         } else {
 869         /*
 870          * For legacy, update frame history with for each Tx retry.
 871          */
 872                 retries = info->status.rates[0].count - 1;
 873                 /* HW doesn't send more than 15 retries */
 874                 retries = min(retries, 15);
 875
 876                 /* The last transmission may have been successful */
 877                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
 878                 /* Collect data for each rate used during failed TX attempts */
 879                 for (i = 0; i <= retries; ++i) {
 880                         tx_rate = le32_to_cpu(table->rs_table[i]);
 881                         rs_get_tbl_info_from_mcs(tx_rate, info->band,
 882                                                  &tbl_type, &rs_index);
 883                         /*
 884                          * Only collect stats if retried rate is in the same RS
 885                          * table as active/search.
 886                          */
 887                         if (table_type_matches(&tbl_type, curr_tbl))
 888                                 tmp_tbl = curr_tbl;
 889                         else if (table_type_matches(&tbl_type, other_tbl))
 890                                 tmp_tbl = other_tbl;
 891                         else
 892                                 continue;
 893                         rs_collect_tx_data(tmp_tbl, rs_index, 1,
 894                                            i < retries ? 0 : legacy_success);
 895                 }
 896
 897                 /* Update success/fail counts if not searching for new mode */
 898                 if (lq_sta->stay_in_tbl) {
 899                         lq_sta->total_success += legacy_success;
 900                         lq_sta->total_failed += retries + (1 - legacy_success);
 901                 }
 902         }
 903         /* The last TX rate is cached in lq_sta; it's set in if/else above */
 904         lq_sta->last_rate_n_flags = tx_rate;
 905 done:
 906         /* See if there's a better rate or modulation mode to try. */
 907         if (sta && sta->supp_rates[sband->band])
 908                 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
 909 }
 910
 911 /*
 912  * Begin a period of staying with a selected modulation mode.
 913  * Set "stay_in_tbl" flag to prevent any mode switches.
 914  * Set frame tx success limits according to legacy vs. high-throughput,
 915  * and reset overall (spanning all rates) tx success history statistics.
 916  * These control how long we stay using same modulation mode before
 917  * searching for a new mode.
 918  */
 919 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
 920                                  struct iwl_lq_sta *lq_sta)
 921 {
 922         IWL_DEBUG_RATE(mvm, "we are staying in the same table\n");
 923         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
 924         if (is_legacy) {
 925                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
 926                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
 927                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
 928         } else {
 929                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
 930                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
 931                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
 932         }
 933         lq_sta->table_count = 0;
 934         lq_sta->total_failed = 0;
 935         lq_sta->total_success = 0;
 936         lq_sta->flush_timer = jiffies;
 937         lq_sta->action_counter = 0;
 938 }
 939
 940 /*
 941  * Find correct throughput table for given mode of modulation
 942  */
 943 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
 944                                       struct iwl_scale_tbl_info *tbl)
 945 {
 946         /* Used to choose among HT tables */
 947         s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
 948
 949         /* Check for invalid LQ type */
 950         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
 951                 tbl->expected_tpt = expected_tpt_legacy;
 952                 return;
 953         }
 954
 955         /* Legacy rates have only one table */
 956         if (is_legacy(tbl->lq_type)) {
 957                 tbl->expected_tpt = expected_tpt_legacy;
 958                 return;
 959         }
 960
 961         /* Choose among many HT tables depending on number of streams
 962          * (SISO/MIMO2), channel width (20/40), SGI, and aggregation
 963          * status */
 964         if (is_siso(tbl->lq_type) && !tbl->is_ht40)
 965                 ht_tbl_pointer = expected_tpt_siso20MHz;
 966         else if (is_siso(tbl->lq_type))
 967                 ht_tbl_pointer = expected_tpt_siso40MHz;
 968         else if (is_mimo2(tbl->lq_type) && !tbl->is_ht40)
 969                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
 970         else {
 971                 WARN_ON_ONCE(!is_mimo2(tbl->lq_type));
 972                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
 973         }
 974
 975         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
 976                 tbl->expected_tpt = ht_tbl_pointer[0];
 977         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
 978                 tbl->expected_tpt = ht_tbl_pointer[1];
 979         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
 980                 tbl->expected_tpt = ht_tbl_pointer[2];
 981         else                                            /* AGG+SGI */
 982                 tbl->expected_tpt = ht_tbl_pointer[3];
 983 }
 984
 985 /*
 986  * Find starting rate for new "search" high-throughput mode of modulation.
 987  * Goal is to find lowest expected rate (under perfect conditions) that is
 988  * above the current measured throughput of "active" mode, to give new mode
 989  * a fair chance to prove itself without too many challenges.
 990  *
 991  * This gets called when transitioning to more aggressive modulation
 992  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
 993  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
 994  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
 995  * bit rate will typically need to increase, but not if performance was bad.
 996  */
 997 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
 998                             struct iwl_lq_sta *lq_sta,
 999                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1000                             u16 rate_mask, s8 index)
1001 {
1002         /* "active" values */
1003         struct iwl_scale_tbl_info *active_tbl =
1004             &(lq_sta->lq_info[lq_sta->active_tbl]);
1005         s32 active_sr = active_tbl->win[index].success_ratio;
1006         s32 active_tpt = active_tbl->expected_tpt[index];
1007
1008         /* expected "search" throughput */
1009         s32 *tpt_tbl = tbl->expected_tpt;
1010
1011         s32 new_rate, high, low, start_hi;
1012         u16 high_low;
1013         s8 rate = index;
1014
1015         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1016
1017         while (1) {
1018                 high_low = rs_get_adjacent_rate(mvm, rate, rate_mask,
1019                                                 tbl->lq_type);
1020
1021                 low = high_low & 0xff;
1022                 high = (high_low >> 8) & 0xff;
1023
1024                 /*
1025                  * Lower the "search" bit rate, to give new "search" mode
1026                  * approximately the same throughput as "active" if:
1027                  *
1028                  * 1) "Active" mode has been working modestly well (but not
1029                  *    great), and expected "search" throughput (under perfect
1030                  *    conditions) at candidate rate is above the actual
1031                  *    measured "active" throughput (but less than expected
1032                  *    "active" throughput under perfect conditions).
1033                  * OR
1034                  * 2) "Active" mode has been working perfectly or very well
1035                  *    and expected "search" throughput (under perfect
1036                  *    conditions) at candidate rate is above expected
1037                  *    "active" throughput (under perfect conditions).
1038                  */
1039                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1040                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1041                       (active_sr <= IWL_RATE_HIGH_TH) &&
1042                       (tpt_tbl[rate] <= active_tpt))) ||
1043                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1044                      (tpt_tbl[rate] > active_tpt))) {
1045                         /* (2nd or later pass)
1046                          * If we've already tried to raise the rate, and are
1047                          * now trying to lower it, use the higher rate. */
1048                         if (start_hi != IWL_RATE_INVALID) {
1049                                 new_rate = start_hi;
1050                                 break;
1051                         }
1052
1053                         new_rate = rate;
1054
1055                         /* Loop again with lower rate */
1056                         if (low != IWL_RATE_INVALID)
1057                                 rate = low;
1058
1059                         /* Lower rate not available, use the original */
1060                         else
1061                                 break;
1062
1063                 /* Else try to raise the "search" rate to match "active" */
1064                 } else {
1065                         /* (2nd or later pass)
1066                          * If we've already tried to lower the rate, and are
1067                          * now trying to raise it, use the lower rate. */
1068                         if (new_rate != IWL_RATE_INVALID)
1069                                 break;
1070
1071                         /* Loop again with higher rate */
1072                         else if (high != IWL_RATE_INVALID) {
1073                                 start_hi = high;
1074                                 rate = high;
1075
1076                         /* Higher rate not available, use the original */
1077                         } else {
1078                                 new_rate = rate;
1079                                 break;
1080                         }
1081                 }
1082         }
1083
1084         return new_rate;
1085 }
1086
1087 static bool iwl_is_ht40_tx_allowed(struct ieee80211_sta *sta)
1088 {
1089         return sta->bandwidth >= IEEE80211_STA_RX_BW_40;
1090 }
1091
1092 /*
1093  * Set up search table for MIMO2
1094  */
1095 static int rs_switch_to_mimo2(struct iwl_mvm *mvm,
1096                              struct iwl_lq_sta *lq_sta,
1097                              struct ieee80211_sta *sta,
1098                              struct iwl_scale_tbl_info *tbl, int index)
1099 {
1100         u16 rate_mask;
1101         s32 rate;
1102         s8 is_green = lq_sta->is_green;
1103
1104         if (!sta->ht_cap.ht_supported)
1105                 return -1;
1106
1107         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1108                 return -1;
1109
1110         /* Need both Tx chains/antennas to support MIMO */
1111         if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) < 2)
1112                 return -1;
1113
1114         IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO2\n");
1115
1116         tbl->lq_type = LQ_MIMO2;
1117         tbl->action = 0;
1118         tbl->max_search = IWL_MAX_SEARCH;
1119         rate_mask = lq_sta->active_mimo2_rate;
1120
1121         if (iwl_is_ht40_tx_allowed(sta))
1122                 tbl->is_ht40 = 1;
1123         else
1124                 tbl->is_ht40 = 0;
1125
1126         rs_set_expected_tpt_table(lq_sta, tbl);
1127
1128         rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1129
1130         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 best rate %d mask %X\n",
1131                        rate, rate_mask);
1132         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1133                 IWL_DEBUG_RATE(mvm, "Can't switch with index %d rate mask %x\n",
1134                                rate, rate_mask);
1135                 return -1;
1136         }
1137         tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green);
1138
1139         IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n",
1140                        tbl->current_rate, is_green);
1141         return 0;
1142 }
1143
1144 /*
1145  * Set up search table for SISO
1146  */
1147 static int rs_switch_to_siso(struct iwl_mvm *mvm,
1148                              struct iwl_lq_sta *lq_sta,
1149                              struct ieee80211_sta *sta,
1150                              struct iwl_scale_tbl_info *tbl, int index)
1151 {
1152         u16 rate_mask;
1153         u8 is_green = lq_sta->is_green;
1154         s32 rate;
1155
1156         if (!sta->ht_cap.ht_supported)
1157                 return -1;
1158
1159         IWL_DEBUG_RATE(mvm, "LQ: try to switch to SISO\n");
1160
1161         tbl->lq_type = LQ_SISO;
1162         tbl->action = 0;
1163         tbl->max_search = IWL_MAX_SEARCH;
1164         rate_mask = lq_sta->active_siso_rate;
1165
1166         if (iwl_is_ht40_tx_allowed(sta))
1167                 tbl->is_ht40 = 1;
1168         else
1169                 tbl->is_ht40 = 0;
1170
1171         if (is_green)
1172                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1173
1174         rs_set_expected_tpt_table(lq_sta, tbl);
1175         rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1176
1177         IWL_DEBUG_RATE(mvm, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1178         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1179                 IWL_DEBUG_RATE(mvm,
1180                                "can not switch with index %d rate mask %x\n",
1181                                rate, rate_mask);
1182                 return -1;
1183         }
1184         tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green);
1185         IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n",
1186                        tbl->current_rate, is_green);
1187         return 0;
1188 }
1189
1190 /*
1191  * Try to switch to new modulation mode from legacy
1192  */
1193 static int rs_move_legacy_other(struct iwl_mvm *mvm,
1194                                 struct iwl_lq_sta *lq_sta,
1195                                 struct ieee80211_sta *sta,
1196                                 int index)
1197 {
1198         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1199         struct iwl_scale_tbl_info *search_tbl =
1200                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1201         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1202         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1203                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1204         u8 start_action;
1205         u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1206         u8 tx_chains_num = num_of_ant(valid_tx_ant);
1207         int ret;
1208         u8 update_search_tbl_counter = 0;
1209
1210         start_action = tbl->action;
1211         while (1) {
1212                 lq_sta->action_counter++;
1213                 switch (tbl->action) {
1214                 case IWL_LEGACY_SWITCH_ANTENNA1:
1215                 case IWL_LEGACY_SWITCH_ANTENNA2:
1216                         IWL_DEBUG_RATE(mvm, "LQ: Legacy toggle Antenna\n");
1217
1218                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1219                              tx_chains_num <= 1) ||
1220                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1221                              tx_chains_num <= 2))
1222                                 break;
1223
1224                         /* Don't change antenna if success has been great */
1225                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1226                                 break;
1227
1228                         /* Set up search table to try other antenna */
1229                         memcpy(search_tbl, tbl, sz);
1230
1231                         if (rs_toggle_antenna(valid_tx_ant,
1232                                               &search_tbl->current_rate,
1233                                               search_tbl)) {
1234                                 update_search_tbl_counter = 1;
1235                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1236                                 goto out;
1237                         }
1238                         break;
1239                 case IWL_LEGACY_SWITCH_SISO:
1240                         IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to SISO\n");
1241
1242                         /* Set up search table to try SISO */
1243                         memcpy(search_tbl, tbl, sz);
1244                         search_tbl->is_SGI = 0;
1245                         ret = rs_switch_to_siso(mvm, lq_sta, sta,
1246                                                  search_tbl, index);
1247                         if (!ret) {
1248                                 lq_sta->action_counter = 0;
1249                                 goto out;
1250                         }
1251
1252                         break;
1253                 case IWL_LEGACY_SWITCH_MIMO2:
1254                         IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO2\n");
1255
1256                         /* Set up search table to try MIMO */
1257                         memcpy(search_tbl, tbl, sz);
1258                         search_tbl->is_SGI = 0;
1259
1260                         search_tbl->ant_type = ANT_AB;
1261
1262                         if (!rs_is_valid_ant(valid_tx_ant,
1263                                              search_tbl->ant_type))
1264                                 break;
1265
1266                         ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1267                                                  search_tbl, index);
1268                         if (!ret) {
1269                                 lq_sta->action_counter = 0;
1270                                 goto out;
1271                         }
1272                         break;
1273                 default:
1274                         WARN_ON_ONCE(1);
1275                 }
1276                 tbl->action++;
1277                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1278                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1279
1280                 if (tbl->action == start_action)
1281                         break;
1282         }
1283         search_tbl->lq_type = LQ_NONE;
1284         return 0;
1285
1286 out:
1287         lq_sta->search_better_tbl = 1;
1288         tbl->action++;
1289         if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1290                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1291         if (update_search_tbl_counter)
1292                 search_tbl->action = tbl->action;
1293         return 0;
1294 }
1295
1296 /*
1297  * Try to switch to new modulation mode from SISO
1298  */
1299 static int rs_move_siso_to_other(struct iwl_mvm *mvm,
1300                                  struct iwl_lq_sta *lq_sta,
1301                                  struct ieee80211_sta *sta, int index)
1302 {
1303         u8 is_green = lq_sta->is_green;
1304         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1305         struct iwl_scale_tbl_info *search_tbl =
1306                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1307         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1308         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1309         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1310                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1311         u8 start_action;
1312         u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1313         u8 tx_chains_num = num_of_ant(valid_tx_ant);
1314         u8 update_search_tbl_counter = 0;
1315         int ret;
1316
1317         switch (BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD)) {
1318         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1319                 /* nothing */
1320                 break;
1321         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1322                 /* avoid antenna B unless MIMO */
1323                 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1324                         tbl->action = IWL_SISO_SWITCH_MIMO2;
1325                 break;
1326         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1327         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1328                 /* avoid antenna B and MIMO */
1329                 valid_tx_ant =
1330                         first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
1331                 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1332                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1333                 break;
1334         default:
1335                 IWL_ERR(mvm, "Invalid BT load %d",
1336                         BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD));
1337                 break;
1338         }
1339
1340         start_action = tbl->action;
1341         while (1) {
1342                 lq_sta->action_counter++;
1343                 switch (tbl->action) {
1344                 case IWL_SISO_SWITCH_ANTENNA1:
1345                 case IWL_SISO_SWITCH_ANTENNA2:
1346                         IWL_DEBUG_RATE(mvm, "LQ: SISO toggle Antenna\n");
1347                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1348                              tx_chains_num <= 1) ||
1349                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1350                              tx_chains_num <= 2))
1351                                 break;
1352
1353                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1354                             BT_MBOX_MSG(&mvm->last_bt_notif, 3,
1355                                         TRAFFIC_LOAD) == 0)
1356                                 break;
1357
1358                         memcpy(search_tbl, tbl, sz);
1359                         if (rs_toggle_antenna(valid_tx_ant,
1360                                               &search_tbl->current_rate,
1361                                               search_tbl)) {
1362                                 update_search_tbl_counter = 1;
1363                                 goto out;
1364                         }
1365                         break;
1366                 case IWL_SISO_SWITCH_MIMO2:
1367                         IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO2\n");
1368                         memcpy(search_tbl, tbl, sz);
1369                         search_tbl->is_SGI = 0;
1370
1371                         search_tbl->ant_type = ANT_AB;
1372
1373                         if (!rs_is_valid_ant(valid_tx_ant,
1374                                              search_tbl->ant_type))
1375                                 break;
1376
1377                         ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1378                                                  search_tbl, index);
1379                         if (!ret)
1380                                 goto out;
1381                         break;
1382                 case IWL_SISO_SWITCH_GI:
1383                         if (!tbl->is_ht40 && !(ht_cap->cap &
1384                                                 IEEE80211_HT_CAP_SGI_20))
1385                                 break;
1386                         if (tbl->is_ht40 && !(ht_cap->cap &
1387                                                 IEEE80211_HT_CAP_SGI_40))
1388                                 break;
1389
1390                         IWL_DEBUG_RATE(mvm, "LQ: SISO toggle SGI/NGI\n");
1391
1392                         memcpy(search_tbl, tbl, sz);
1393                         if (is_green) {
1394                                 if (!tbl->is_SGI)
1395                                         break;
1396                                 else
1397                                         IWL_ERR(mvm,
1398                                                 "SGI was set in GF+SISO\n");
1399                         }
1400                         search_tbl->is_SGI = !tbl->is_SGI;
1401                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1402                         if (tbl->is_SGI) {
1403                                 s32 tpt = lq_sta->last_tpt / 100;
1404                                 if (tpt >= search_tbl->expected_tpt[index])
1405                                         break;
1406                         }
1407                         search_tbl->current_rate =
1408                                 rate_n_flags_from_tbl(mvm, search_tbl,
1409                                                       index, is_green);
1410                         update_search_tbl_counter = 1;
1411                         goto out;
1412                 default:
1413                         WARN_ON_ONCE(1);
1414                 }
1415                 tbl->action++;
1416                 if (tbl->action > IWL_SISO_SWITCH_GI)
1417                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1418
1419                 if (tbl->action == start_action)
1420                         break;
1421         }
1422         search_tbl->lq_type = LQ_NONE;
1423         return 0;
1424
1425  out:
1426         lq_sta->search_better_tbl = 1;
1427         tbl->action++;
1428         if (tbl->action > IWL_SISO_SWITCH_GI)
1429                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1430         if (update_search_tbl_counter)
1431                 search_tbl->action = tbl->action;
1432
1433         return 0;
1434 }
1435
1436 /*
1437  * Try to switch to new modulation mode from MIMO2
1438  */
1439 static int rs_move_mimo2_to_other(struct iwl_mvm *mvm,
1440                                  struct iwl_lq_sta *lq_sta,
1441                                  struct ieee80211_sta *sta, int index)
1442 {
1443         s8 is_green = lq_sta->is_green;
1444         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1445         struct iwl_scale_tbl_info *search_tbl =
1446                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1447         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1448         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1449         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1450                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1451         u8 start_action;
1452         u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1453         u8 tx_chains_num = num_of_ant(valid_tx_ant);
1454         u8 update_search_tbl_counter = 0;
1455         int ret;
1456
1457         switch (BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD)) {
1458         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1459                 /* nothing */
1460                 break;
1461         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1462         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1463                 /* avoid antenna B and MIMO */
1464                 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1465                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1466                 break;
1467         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1468                 /* avoid antenna B unless MIMO */
1469                 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1470                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1471                 break;
1472         default:
1473                 IWL_ERR(mvm, "Invalid BT load %d",
1474                         BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD));
1475                 break;
1476         }
1477
1478         start_action = tbl->action;
1479         while (1) {
1480                 lq_sta->action_counter++;
1481                 switch (tbl->action) {
1482                 case IWL_MIMO2_SWITCH_ANTENNA1:
1483                 case IWL_MIMO2_SWITCH_ANTENNA2:
1484                         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle Antennas\n");
1485
1486                         if (tx_chains_num <= 2)
1487                                 break;
1488
1489                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1490                                 break;
1491
1492                         memcpy(search_tbl, tbl, sz);
1493                         if (rs_toggle_antenna(valid_tx_ant,
1494                                               &search_tbl->current_rate,
1495                                               search_tbl)) {
1496                                 update_search_tbl_counter = 1;
1497                                 goto out;
1498                         }
1499                         break;
1500                 case IWL_MIMO2_SWITCH_SISO_A:
1501                 case IWL_MIMO2_SWITCH_SISO_B:
1502                         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to SISO\n");
1503
1504                         /* Set up new search table for SISO */
1505                         memcpy(search_tbl, tbl, sz);
1506
1507                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1508                                 search_tbl->ant_type = ANT_A;
1509                         else /* tbl->action == IWL_MIMO2_SWITCH_SISO_B */
1510                                 search_tbl->ant_type = ANT_B;
1511
1512                         if (!rs_is_valid_ant(valid_tx_ant,
1513                                              search_tbl->ant_type))
1514                                 break;
1515
1516                         ret = rs_switch_to_siso(mvm, lq_sta, sta,
1517                                                  search_tbl, index);
1518                         if (!ret)
1519                                 goto out;
1520
1521                         break;
1522
1523                 case IWL_MIMO2_SWITCH_GI:
1524                         if (!tbl->is_ht40 && !(ht_cap->cap &
1525                                                 IEEE80211_HT_CAP_SGI_20))
1526                                 break;
1527                         if (tbl->is_ht40 && !(ht_cap->cap &
1528                                                 IEEE80211_HT_CAP_SGI_40))
1529                                 break;
1530
1531                         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle SGI/NGI\n");
1532
1533                         /* Set up new search table for MIMO2 */
1534                         memcpy(search_tbl, tbl, sz);
1535                         search_tbl->is_SGI = !tbl->is_SGI;
1536                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1537                         /*
1538                          * If active table already uses the fastest possible
1539                          * modulation (dual stream with short guard interval),
1540                          * and it's working well, there's no need to look
1541                          * for a better type of modulation!
1542                          */
1543                         if (tbl->is_SGI) {
1544                                 s32 tpt = lq_sta->last_tpt / 100;
1545                                 if (tpt >= search_tbl->expected_tpt[index])
1546                                         break;
1547                         }
1548                         search_tbl->current_rate =
1549                                 rate_n_flags_from_tbl(mvm, search_tbl,
1550                                                       index, is_green);
1551                         update_search_tbl_counter = 1;
1552                         goto out;
1553                 default:
1554                         WARN_ON_ONCE(1);
1555                 }
1556                 tbl->action++;
1557                 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1558                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1559
1560                 if (tbl->action == start_action)
1561                         break;
1562         }
1563         search_tbl->lq_type = LQ_NONE;
1564         return 0;
1565  out:
1566         lq_sta->search_better_tbl = 1;
1567         tbl->action++;
1568         if (tbl->action > IWL_MIMO2_SWITCH_GI)
1569                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1570         if (update_search_tbl_counter)
1571                 search_tbl->action = tbl->action;
1572
1573         return 0;
1574 }
1575
1576 /*
1577  * Check whether we should continue using same modulation mode, or
1578  * begin search for a new mode, based on:
1579  * 1) # tx successes or failures while using this mode
1580  * 2) # times calling this function
1581  * 3) elapsed time in this mode (not used, for now)
1582  */
1583 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1584 {
1585         struct iwl_scale_tbl_info *tbl;
1586         int i;
1587         int active_tbl;
1588         int flush_interval_passed = 0;
1589         struct iwl_mvm *mvm;
1590
1591         mvm = lq_sta->drv;
1592         active_tbl = lq_sta->active_tbl;
1593
1594         tbl = &(lq_sta->lq_info[active_tbl]);
1595
1596         /* If we've been disallowing search, see if we should now allow it */
1597         if (lq_sta->stay_in_tbl) {
1598                 /* Elapsed time using current modulation mode */
1599                 if (lq_sta->flush_timer)
1600                         flush_interval_passed =
1601                                 time_after(jiffies,
1602                                            (unsigned long)(lq_sta->flush_timer +
1603                                                 IWL_RATE_SCALE_FLUSH_INTVL));
1604
1605                 /*
1606                  * Check if we should allow search for new modulation mode.
1607                  * If many frames have failed or succeeded, or we've used
1608                  * this same modulation for a long time, allow search, and
1609                  * reset history stats that keep track of whether we should
1610                  * allow a new search.  Also (below) reset all bitmaps and
1611                  * stats in active history.
1612                  */
1613                 if (force_search ||
1614                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1615                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1616                     ((!lq_sta->search_better_tbl) &&
1617                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1618                         IWL_DEBUG_RATE(mvm,
1619                                        "LQ: stay is expired %d %d %d\n",
1620                                      lq_sta->total_failed,
1621                                      lq_sta->total_success,
1622                                      flush_interval_passed);
1623
1624                         /* Allow search for new mode */
1625                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1626                         lq_sta->total_failed = 0;
1627                         lq_sta->total_success = 0;
1628                         lq_sta->flush_timer = 0;
1629                 /*
1630                  * Else if we've used this modulation mode enough repetitions
1631                  * (regardless of elapsed time or success/failure), reset
1632                  * history bitmaps and rate-specific stats for all rates in
1633                  * active table.
1634                  */
1635                 } else {
1636                         lq_sta->table_count++;
1637                         if (lq_sta->table_count >=
1638                             lq_sta->table_count_limit) {
1639                                 lq_sta->table_count = 0;
1640
1641                                 IWL_DEBUG_RATE(mvm,
1642                                                "LQ: stay in table clear win\n");
1643                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1644                                         rs_rate_scale_clear_window(
1645                                                 &(tbl->win[i]));
1646                         }
1647                 }
1648
1649                 /* If transitioning to allow "search", reset all history
1650                  * bitmaps and stats in active table (this will become the new
1651                  * "search" table). */
1652                 if (!lq_sta->stay_in_tbl) {
1653                         for (i = 0; i < IWL_RATE_COUNT; i++)
1654                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1655                 }
1656         }
1657 }
1658
1659 /*
1660  * setup rate table in uCode
1661  */
1662 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1663                                struct iwl_lq_sta *lq_sta,
1664                                struct iwl_scale_tbl_info *tbl,
1665                                int index, u8 is_green)
1666 {
1667         u32 rate;
1668
1669         /* Update uCode's rate table. */
1670         rate = rate_n_flags_from_tbl(mvm, tbl, index, is_green);
1671         rs_fill_link_cmd(mvm, lq_sta, rate);
1672         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
1673 }
1674
1675 static u8 rs_get_tid(struct iwl_lq_sta *lq_data,
1676                      struct ieee80211_hdr *hdr)
1677 {
1678         u8 tid = IWL_MAX_TID_COUNT;
1679
1680         if (ieee80211_is_data_qos(hdr->frame_control)) {
1681                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1682                 tid = qc[0] & 0xf;
1683         }
1684
1685         if (unlikely(tid > IWL_MAX_TID_COUNT))
1686                 tid = IWL_MAX_TID_COUNT;
1687
1688         return tid;
1689 }
1690
1691 /*
1692  * Do rate scaling and search for new modulation mode.
1693  */
1694 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1695                                   struct sk_buff *skb,
1696                                   struct ieee80211_sta *sta,
1697                                   struct iwl_lq_sta *lq_sta)
1698 {
1699         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1700         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1701         int low = IWL_RATE_INVALID;
1702         int high = IWL_RATE_INVALID;
1703         int index;
1704         int i;
1705         struct iwl_rate_scale_data *window = NULL;
1706         int current_tpt = IWL_INVALID_VALUE;
1707         int low_tpt = IWL_INVALID_VALUE;
1708         int high_tpt = IWL_INVALID_VALUE;
1709         u32 fail_count;
1710         s8 scale_action = 0;
1711         u16 rate_mask;
1712         u8 update_lq = 0;
1713         struct iwl_scale_tbl_info *tbl, *tbl1;
1714         u16 rate_scale_index_msk = 0;
1715         u8 is_green = 0;
1716         u8 active_tbl = 0;
1717         u8 done_search = 0;
1718         u16 high_low;
1719         s32 sr;
1720         u8 tid = IWL_MAX_TID_COUNT;
1721         struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
1722         struct iwl_mvm_tid_data *tid_data;
1723
1724         IWL_DEBUG_RATE(mvm, "rate scale calculate new rate for skb\n");
1725
1726         /* Send management frames and NO_ACK data using lowest rate. */
1727         /* TODO: this could probably be improved.. */
1728         if (!ieee80211_is_data(hdr->frame_control) ||
1729             info->flags & IEEE80211_TX_CTL_NO_ACK)
1730                 return;
1731
1732         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1733
1734         tid = rs_get_tid(lq_sta, hdr);
1735         if ((tid != IWL_MAX_TID_COUNT) &&
1736             (lq_sta->tx_agg_tid_en & (1 << tid))) {
1737                 tid_data = &sta_priv->tid_data[tid];
1738                 if (tid_data->state == IWL_AGG_OFF)
1739                         lq_sta->is_agg = 0;
1740                 else
1741                         lq_sta->is_agg = 1;
1742         } else {
1743                 lq_sta->is_agg = 0;
1744         }
1745
1746         /*
1747          * Select rate-scale / modulation-mode table to work with in
1748          * the rest of this function:  "search" if searching for better
1749          * modulation mode, or "active" if doing rate scaling within a mode.
1750          */
1751         if (!lq_sta->search_better_tbl)
1752                 active_tbl = lq_sta->active_tbl;
1753         else
1754                 active_tbl = 1 - lq_sta->active_tbl;
1755
1756         tbl = &(lq_sta->lq_info[active_tbl]);
1757         if (is_legacy(tbl->lq_type))
1758                 lq_sta->is_green = 0;
1759         else
1760                 lq_sta->is_green = rs_use_green(sta);
1761         is_green = lq_sta->is_green;
1762
1763         /* current tx rate */
1764         index = lq_sta->last_txrate_idx;
1765
1766         IWL_DEBUG_RATE(mvm, "Rate scale index %d for type %d\n", index,
1767                        tbl->lq_type);
1768
1769         /* rates available for this association, and for modulation mode */
1770         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1771
1772         IWL_DEBUG_RATE(mvm, "mask 0x%04X\n", rate_mask);
1773
1774         /* mask with station rate restriction */
1775         if (is_legacy(tbl->lq_type)) {
1776                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1777                         /* supp_rates has no CCK bits in A mode */
1778                         rate_scale_index_msk = (u16) (rate_mask &
1779                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1780                 else
1781                         rate_scale_index_msk = (u16) (rate_mask &
1782                                                       lq_sta->supp_rates);
1783
1784         } else {
1785                 rate_scale_index_msk = rate_mask;
1786         }
1787
1788         if (!rate_scale_index_msk)
1789                 rate_scale_index_msk = rate_mask;
1790
1791         if (!((1 << index) & rate_scale_index_msk)) {
1792                 IWL_ERR(mvm, "Current Rate is not valid\n");
1793                 if (lq_sta->search_better_tbl) {
1794                         /* revert to active table if search table is not valid*/
1795                         tbl->lq_type = LQ_NONE;
1796                         lq_sta->search_better_tbl = 0;
1797                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1798                         /* get "active" rate info */
1799                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1800                         rs_update_rate_tbl(mvm, lq_sta, tbl, index, is_green);
1801                 }
1802                 return;
1803         }
1804
1805         /* Get expected throughput table and history window for current rate */
1806         if (!tbl->expected_tpt) {
1807                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
1808                 return;
1809         }
1810
1811         /* force user max rate if set by user */
1812         if ((lq_sta->max_rate_idx != -1) &&
1813             (lq_sta->max_rate_idx < index)) {
1814                 index = lq_sta->max_rate_idx;
1815                 update_lq = 1;
1816                 window = &(tbl->win[index]);
1817                 goto lq_update;
1818         }
1819
1820         window = &(tbl->win[index]);
1821
1822         /*
1823          * If there is not enough history to calculate actual average
1824          * throughput, keep analyzing results of more tx frames, without
1825          * changing rate or mode (bypass most of the rest of this function).
1826          * Set up new rate table in uCode only if old rate is not supported
1827          * in current association (use new rate found above).
1828          */
1829         fail_count = window->counter - window->success_counter;
1830         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1831             (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1832                 IWL_DEBUG_RATE(mvm,
1833                                "LQ: still below TH. succ=%d total=%d for index %d\n",
1834                                window->success_counter, window->counter, index);
1835
1836                 /* Can't calculate this yet; not enough history */
1837                 window->average_tpt = IWL_INVALID_VALUE;
1838
1839                 /* Should we stay with this modulation mode,
1840                  * or search for a new one? */
1841                 rs_stay_in_table(lq_sta, false);
1842
1843                 goto out;
1844         }
1845         /* Else we have enough samples; calculate estimate of
1846          * actual average throughput */
1847         if (window->average_tpt != ((window->success_ratio *
1848                         tbl->expected_tpt[index] + 64) / 128)) {
1849                 IWL_ERR(mvm,
1850                         "expected_tpt should have been calculated by now\n");
1851                 window->average_tpt = ((window->success_ratio *
1852                                         tbl->expected_tpt[index] + 64) / 128);
1853         }
1854
1855         /* If we are searching for better modulation mode, check success. */
1856         if (lq_sta->search_better_tbl) {
1857                 /* If good success, continue using the "search" mode;
1858                  * no need to send new link quality command, since we're
1859                  * continuing to use the setup that we've been trying. */
1860                 if (window->average_tpt > lq_sta->last_tpt) {
1861                         IWL_DEBUG_RATE(mvm,
1862                                        "LQ: SWITCHING TO NEW TABLE suc=%d cur-tpt=%d old-tpt=%d\n",
1863                                        window->success_ratio,
1864                                        window->average_tpt,
1865                                        lq_sta->last_tpt);
1866
1867                         if (!is_legacy(tbl->lq_type))
1868                                 lq_sta->enable_counter = 1;
1869
1870                         /* Swap tables; "search" becomes "active" */
1871                         lq_sta->active_tbl = active_tbl;
1872                         current_tpt = window->average_tpt;
1873                 /* Else poor success; go back to mode in "active" table */
1874                 } else {
1875                         IWL_DEBUG_RATE(mvm,
1876                                        "LQ: GOING BACK TO THE OLD TABLE suc=%d cur-tpt=%d old-tpt=%d\n",
1877                                        window->success_ratio,
1878                                        window->average_tpt,
1879                                        lq_sta->last_tpt);
1880
1881                         /* Nullify "search" table */
1882                         tbl->lq_type = LQ_NONE;
1883
1884                         /* Revert to "active" table */
1885                         active_tbl = lq_sta->active_tbl;
1886                         tbl = &(lq_sta->lq_info[active_tbl]);
1887
1888                         /* Revert to "active" rate and throughput info */
1889                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1890                         current_tpt = lq_sta->last_tpt;
1891
1892                         /* Need to set up a new rate table in uCode */
1893                         update_lq = 1;
1894                 }
1895
1896                 /* Either way, we've made a decision; modulation mode
1897                  * search is done, allow rate adjustment next time. */
1898                 lq_sta->search_better_tbl = 0;
1899                 done_search = 1;        /* Don't switch modes below! */
1900                 goto lq_update;
1901         }
1902
1903         /* (Else) not in search of better modulation mode, try for better
1904          * starting rate, while staying in this mode. */
1905         high_low = rs_get_adjacent_rate(mvm, index, rate_scale_index_msk,
1906                                         tbl->lq_type);
1907         low = high_low & 0xff;
1908         high = (high_low >> 8) & 0xff;
1909
1910         /* If user set max rate, dont allow higher than user constrain */
1911         if ((lq_sta->max_rate_idx != -1) &&
1912             (lq_sta->max_rate_idx < high))
1913                 high = IWL_RATE_INVALID;
1914
1915         sr = window->success_ratio;
1916
1917         /* Collect measured throughputs for current and adjacent rates */
1918         current_tpt = window->average_tpt;
1919         if (low != IWL_RATE_INVALID)
1920                 low_tpt = tbl->win[low].average_tpt;
1921         if (high != IWL_RATE_INVALID)
1922                 high_tpt = tbl->win[high].average_tpt;
1923
1924         scale_action = 0;
1925
1926         /* Too many failures, decrease rate */
1927         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1928                 IWL_DEBUG_RATE(mvm,
1929                                "decrease rate because of low success_ratio\n");
1930                 scale_action = -1;
1931         /* No throughput measured yet for adjacent rates; try increase. */
1932         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1933                    (high_tpt == IWL_INVALID_VALUE)) {
1934                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1935                         scale_action = 1;
1936                 else if (low != IWL_RATE_INVALID)
1937                         scale_action = 0;
1938         }
1939
1940         /* Both adjacent throughputs are measured, but neither one has better
1941          * throughput; we're using the best rate, don't change it! */
1942         else if ((low_tpt != IWL_INVALID_VALUE) &&
1943                  (high_tpt != IWL_INVALID_VALUE) &&
1944                  (low_tpt < current_tpt) &&
1945                  (high_tpt < current_tpt))
1946                 scale_action = 0;
1947
1948         /* At least one adjacent rate's throughput is measured,
1949          * and may have better performance. */
1950         else {
1951                 /* Higher adjacent rate's throughput is measured */
1952                 if (high_tpt != IWL_INVALID_VALUE) {
1953                         /* Higher rate has better throughput */
1954                         if (high_tpt > current_tpt &&
1955                             sr >= IWL_RATE_INCREASE_TH) {
1956                                 scale_action = 1;
1957                         } else {
1958                                 scale_action = 0;
1959                         }
1960
1961                 /* Lower adjacent rate's throughput is measured */
1962                 } else if (low_tpt != IWL_INVALID_VALUE) {
1963                         /* Lower rate has better throughput */
1964                         if (low_tpt > current_tpt) {
1965                                 IWL_DEBUG_RATE(mvm,
1966                                                "decrease rate because of low tpt\n");
1967                                 scale_action = -1;
1968                         } else if (sr >= IWL_RATE_INCREASE_TH) {
1969                                 scale_action = 1;
1970                         }
1971                 }
1972         }
1973
1974         /* Sanity check; asked for decrease, but success rate or throughput
1975          * has been good at old rate.  Don't change it. */
1976         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1977             ((sr > IWL_RATE_HIGH_TH) ||
1978              (current_tpt > (100 * tbl->expected_tpt[low]))))
1979                 scale_action = 0;
1980
1981         if ((BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD) >=
1982              IWL_BT_COEX_TRAFFIC_LOAD_HIGH) && (is_mimo(tbl->lq_type))) {
1983                 if (lq_sta->last_bt_traffic >
1984                     BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD)) {
1985                         /*
1986                          * don't set scale_action, don't want to scale up if
1987                          * the rate scale doesn't otherwise think that is a
1988                          * good idea.
1989                          */
1990                 } else if (lq_sta->last_bt_traffic <=
1991                            BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD)) {
1992                         scale_action = -1;
1993                 }
1994         }
1995         lq_sta->last_bt_traffic =
1996                 BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD);
1997
1998         if ((BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD) >=
1999              IWL_BT_COEX_TRAFFIC_LOAD_HIGH) && is_mimo(tbl->lq_type)) {
2000                 /* search for a new modulation */
2001                 rs_stay_in_table(lq_sta, true);
2002                 goto lq_update;
2003         }
2004
2005         switch (scale_action) {
2006         case -1:
2007                 /* Decrease starting rate, update uCode's rate table */
2008                 if (low != IWL_RATE_INVALID) {
2009                         update_lq = 1;
2010                         index = low;
2011                 }
2012
2013                 break;
2014         case 1:
2015                 /* Increase starting rate, update uCode's rate table */
2016                 if (high != IWL_RATE_INVALID) {
2017                         update_lq = 1;
2018                         index = high;
2019                 }
2020
2021                 break;
2022         case 0:
2023                 /* No change */
2024         default:
2025                 break;
2026         }
2027
2028         IWL_DEBUG_RATE(mvm,
2029                        "choose rate scale index %d action %d low %d high %d type %d\n",
2030                        index, scale_action, low, high, tbl->lq_type);
2031
2032 lq_update:
2033         /* Replace uCode's rate table for the destination station. */
2034         if (update_lq)
2035                 rs_update_rate_tbl(mvm, lq_sta, tbl, index, is_green);
2036
2037         rs_stay_in_table(lq_sta, false);
2038
2039         /*
2040          * Search for new modulation mode if we're:
2041          * 1)  Not changing rates right now
2042          * 2)  Not just finishing up a search
2043          * 3)  Allowing a new search
2044          */
2045         if (!update_lq && !done_search &&
2046             !lq_sta->stay_in_tbl && window->counter) {
2047                 /* Save current throughput to compare with "search" throughput*/
2048                 lq_sta->last_tpt = current_tpt;
2049
2050                 /* Select a new "search" modulation mode to try.
2051                  * If one is found, set up the new "search" table. */
2052                 if (is_legacy(tbl->lq_type))
2053                         rs_move_legacy_other(mvm, lq_sta, sta, index);
2054                 else if (is_siso(tbl->lq_type))
2055                         rs_move_siso_to_other(mvm, lq_sta, sta, index);
2056                 else if (is_mimo2(tbl->lq_type))
2057                         rs_move_mimo2_to_other(mvm, lq_sta, sta, index);
2058                 else
2059                         WARN_ON_ONCE(1);
2060
2061                 /* If new "search" mode was selected, set up in uCode table */
2062                 if (lq_sta->search_better_tbl) {
2063                         /* Access the "search" table, clear its history. */
2064                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2065                         for (i = 0; i < IWL_RATE_COUNT; i++)
2066                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2067
2068                         /* Use new "search" start rate */
2069                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2070
2071                         IWL_DEBUG_RATE(mvm,
2072                                        "Switch current  mcs: %X index: %d\n",
2073                                        tbl->current_rate, index);
2074                         rs_fill_link_cmd(mvm, lq_sta, tbl->current_rate);
2075                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
2076                 } else {
2077                         done_search = 1;
2078                 }
2079         }
2080
2081         if (done_search && !lq_sta->stay_in_tbl) {
2082                 /* If the "active" (non-search) mode was legacy,
2083                  * and we've tried switching antennas,
2084                  * but we haven't been able to try HT modes (not available),
2085                  * stay with best antenna legacy modulation for a while
2086                  * before next round of mode comparisons. */
2087                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2088                 if (is_legacy(tbl1->lq_type) && !sta->ht_cap.ht_supported &&
2089                     lq_sta->action_counter > tbl1->max_search) {
2090                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2091                         rs_set_stay_in_table(mvm, 1, lq_sta);
2092                 }
2093
2094                 /* If we're in an HT mode, and all 3 mode switch actions
2095                  * have been tried and compared, stay in this best modulation
2096                  * mode for a while before next round of mode comparisons. */
2097                 if (lq_sta->enable_counter &&
2098                     (lq_sta->action_counter >= tbl1->max_search)) {
2099                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2100                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2101                             (tid != IWL_MAX_TID_COUNT)) {
2102                                 tid_data = &sta_priv->tid_data[tid];
2103                                 if (tid_data->state == IWL_AGG_OFF) {
2104                                         IWL_DEBUG_RATE(mvm,
2105                                                        "try to aggregate tid %d\n",
2106                                                        tid);
2107                                         rs_tl_turn_on_agg(mvm, tid,
2108                                                           lq_sta, sta);
2109                                 }
2110                         }
2111                         rs_set_stay_in_table(mvm, 0, lq_sta);
2112                 }
2113         }
2114
2115 out:
2116         tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, index, is_green);
2117         lq_sta->last_txrate_idx = index;
2118 }
2119
2120 /**
2121  * rs_initialize_lq - Initialize a station's hardware rate table
2122  *
2123  * The uCode's station table contains a table of fallback rates
2124  * for automatic fallback during transmission.
2125  *
2126  * NOTE: This sets up a default set of values.  These will be replaced later
2127  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2128  *       rc80211_simple.
2129  *
2130  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2131  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2132  *       which requires station table entry to exist).
2133  */
2134 static void rs_initialize_lq(struct iwl_mvm *mvm,
2135                              struct ieee80211_sta *sta,
2136                              struct iwl_lq_sta *lq_sta,
2137                              enum ieee80211_band band)
2138 {
2139         struct iwl_scale_tbl_info *tbl;
2140         int rate_idx;
2141         int i;
2142         u32 rate;
2143         u8 use_green = rs_use_green(sta);
2144         u8 active_tbl = 0;
2145         u8 valid_tx_ant;
2146
2147         if (!sta || !lq_sta)
2148                 return;
2149
2150         i = lq_sta->last_txrate_idx;
2151
2152         valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2153
2154         if (!lq_sta->search_better_tbl)
2155                 active_tbl = lq_sta->active_tbl;
2156         else
2157                 active_tbl = 1 - lq_sta->active_tbl;
2158
2159         tbl = &(lq_sta->lq_info[active_tbl]);
2160
2161         if ((i < 0) || (i >= IWL_RATE_COUNT))
2162                 i = 0;
2163
2164         rate = iwl_rates[i].plcp;
2165         tbl->ant_type = first_antenna(valid_tx_ant);
2166         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2167
2168         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2169                 rate |= RATE_MCS_CCK_MSK;
2170
2171         rs_get_tbl_info_from_mcs(rate, band, tbl, &rate_idx);
2172         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2173                 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2174
2175         rate = rate_n_flags_from_tbl(mvm, tbl, rate_idx, use_green);
2176         tbl->current_rate = rate;
2177         rs_set_expected_tpt_table(lq_sta, tbl);
2178         rs_fill_link_cmd(NULL, lq_sta, rate);
2179         /* TODO restore station should remember the lq cmd */
2180         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_SYNC, true);
2181 }
2182
2183 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2184                         struct ieee80211_tx_rate_control *txrc)
2185 {
2186         struct sk_buff *skb = txrc->skb;
2187         struct ieee80211_supported_band *sband = txrc->sband;
2188         struct iwl_op_mode *op_mode __maybe_unused =
2189                         (struct iwl_op_mode *)mvm_r;
2190         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2191         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2192         struct iwl_lq_sta *lq_sta = mvm_sta;
2193         int rate_idx;
2194
2195         IWL_DEBUG_RATE_LIMIT(mvm, "rate scale calculate new rate for skb\n");
2196
2197         /* Get max rate if user set max rate */
2198         if (lq_sta) {
2199                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2200                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2201                     (lq_sta->max_rate_idx != -1))
2202                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2203                 if ((lq_sta->max_rate_idx < 0) ||
2204                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2205                         lq_sta->max_rate_idx = -1;
2206         }
2207
2208         /* Treat uninitialized rate scaling data same as non-existing. */
2209         if (lq_sta && !lq_sta->drv) {
2210                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2211                 mvm_sta = NULL;
2212         }
2213
2214         /* Send management frames and NO_ACK data using lowest rate. */
2215         if (rate_control_send_low(sta, mvm_sta, txrc))
2216                 return;
2217
2218         rate_idx  = lq_sta->last_txrate_idx;
2219
2220         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2221                 rate_idx -= IWL_FIRST_OFDM_RATE;
2222                 /* 6M and 9M shared same MCS index */
2223                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2224                 WARN_ON_ONCE(rs_extract_rate(lq_sta->last_rate_n_flags) >=
2225                              IWL_RATE_MIMO3_6M_PLCP);
2226                 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2227                     IWL_RATE_MIMO2_6M_PLCP)
2228                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2229                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2230                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2231                         info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2232                 if (lq_sta->last_rate_n_flags & RATE_MCS_CHAN_WIDTH_40) /* TODO */
2233                         info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2234                 if (lq_sta->last_rate_n_flags & RATE_HT_MCS_GF_MSK)
2235                         info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2236         } else {
2237                 /* Check for invalid rates */
2238                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2239                     ((sband->band == IEEE80211_BAND_5GHZ) &&
2240                      (rate_idx < IWL_FIRST_OFDM_RATE)))
2241                         rate_idx = rate_lowest_index(sband, sta);
2242                 /* On valid 5 GHz rate, adjust index */
2243                 else if (sband->band == IEEE80211_BAND_5GHZ)
2244                         rate_idx -= IWL_FIRST_OFDM_RATE;
2245                 info->control.rates[0].flags = 0;
2246         }
2247         info->control.rates[0].idx = rate_idx;
2248         info->control.rates[0].count = 1;
2249 }
2250
2251 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2252                           gfp_t gfp)
2253 {
2254         struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2255         struct iwl_op_mode *op_mode __maybe_unused =
2256                         (struct iwl_op_mode *)mvm_rate;
2257         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2258
2259         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2260
2261         return &sta_priv->lq_sta;
2262 }
2263
2264 /*
2265  * Called after adding a new station to initialize rate scaling
2266  */
2267 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2268                           enum ieee80211_band band)
2269 {
2270         int i, j;
2271         struct ieee80211_hw *hw = mvm->hw;
2272         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2273         struct iwl_mvm_sta *sta_priv;
2274         struct iwl_lq_sta *lq_sta;
2275         struct ieee80211_supported_band *sband;
2276         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2277
2278         sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2279         lq_sta = &sta_priv->lq_sta;
2280         sband = hw->wiphy->bands[band];
2281
2282         lq_sta->lq.sta_id = sta_priv->sta_id;
2283
2284         for (j = 0; j < LQ_SIZE; j++)
2285                 for (i = 0; i < IWL_RATE_COUNT; i++)
2286                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2287
2288         lq_sta->flush_timer = 0;
2289         lq_sta->supp_rates = sta->supp_rates[sband->band];
2290
2291         IWL_DEBUG_RATE(mvm,
2292                        "LQ: *** rate scale station global init for station %d ***\n",
2293                        sta_priv->sta_id);
2294         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2295          * the lowest or the highest rate.. Could consider using RSSI from
2296          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2297          * after assoc.. */
2298
2299         lq_sta->max_rate_idx = -1;
2300         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2301         lq_sta->is_green = rs_use_green(sta);
2302         lq_sta->band = sband->band;
2303         /*
2304          * active legacy rates as per supported rates bitmap
2305          */
2306         supp = sta->supp_rates[sband->band];
2307         lq_sta->active_legacy_rate = 0;
2308         for_each_set_bit(i, &supp, BITS_PER_LONG)
2309                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2310
2311         /*
2312          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2313          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2314          */
2315         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2316         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2317         lq_sta->active_siso_rate &= ~((u16)0x2);
2318         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2319
2320         /* Same here */
2321         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2322         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2323         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2324         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2325
2326         IWL_DEBUG_RATE(mvm,
2327                        "SISO-RATE=%X MIMO2-RATE=%X\n",
2328                        lq_sta->active_siso_rate,
2329                        lq_sta->active_mimo2_rate);
2330
2331         /* These values will be overridden later */
2332         lq_sta->lq.single_stream_ant_msk =
2333                 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
2334         lq_sta->lq.dual_stream_ant_msk =
2335                 iwl_fw_valid_tx_ant(mvm->fw) &
2336                 ~first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
2337         if (!lq_sta->lq.dual_stream_ant_msk) {
2338                 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2339         } else if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) == 2) {
2340                 lq_sta->lq.dual_stream_ant_msk =
2341                         iwl_fw_valid_tx_ant(mvm->fw);
2342         }
2343
2344         /* as default allow aggregation for all tids */
2345         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2346         lq_sta->drv = mvm;
2347
2348         /* Set last_txrate_idx to lowest rate */
2349         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2350         if (sband->band == IEEE80211_BAND_5GHZ)
2351                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2352         lq_sta->is_agg = 0;
2353 #ifdef CONFIG_MAC80211_DEBUGFS
2354         lq_sta->dbg_fixed_rate = 0;
2355 #endif
2356
2357         rs_initialize_lq(mvm, sta, lq_sta, band);
2358 }
2359
2360 static void rs_fill_link_cmd(struct iwl_mvm *mvm,
2361                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2362 {
2363         struct iwl_scale_tbl_info tbl_type;
2364         int index = 0;
2365         int rate_idx;
2366         int repeat_rate = 0;
2367         u8 ant_toggle_cnt = 0;
2368         u8 use_ht_possible = 1;
2369         u8 valid_tx_ant = 0;
2370         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2371
2372         /* Override starting rate (index 0) if needed for debug purposes */
2373         rs_dbgfs_set_mcs(lq_sta, &new_rate);
2374
2375         /* Interpret new_rate (rate_n_flags) */
2376         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2377                                  &tbl_type, &rate_idx);
2378
2379         /* How many times should we repeat the initial rate? */
2380         if (is_legacy(tbl_type.lq_type)) {
2381                 ant_toggle_cnt = 1;
2382                 repeat_rate = IWL_NUMBER_TRY;
2383         } else {
2384                 repeat_rate = min(IWL_HT_NUMBER_TRY,
2385                                   LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2386         }
2387
2388         lq_cmd->mimo_delim = is_mimo(tbl_type.lq_type) ? 1 : 0;
2389
2390         /* Fill 1st table entry (index 0) */
2391         lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2392
2393         if (num_of_ant(tbl_type.ant_type) == 1)
2394                 lq_cmd->single_stream_ant_msk = tbl_type.ant_type;
2395         else if (num_of_ant(tbl_type.ant_type) == 2)
2396                 lq_cmd->dual_stream_ant_msk = tbl_type.ant_type;
2397         /* otherwise we don't modify the existing value */
2398
2399         index++;
2400         repeat_rate--;
2401         if (mvm)
2402                 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2403
2404         /* Fill rest of rate table */
2405         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2406                 /* Repeat initial/next rate.
2407                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2408                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2409                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2410                         if (is_legacy(tbl_type.lq_type)) {
2411                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2412                                         ant_toggle_cnt++;
2413                                 else if (mvm &&
2414                                          rs_toggle_antenna(valid_tx_ant,
2415                                                         &new_rate, &tbl_type))
2416                                         ant_toggle_cnt = 1;
2417                         }
2418
2419                         /* Override next rate if needed for debug purposes */
2420                         rs_dbgfs_set_mcs(lq_sta, &new_rate);
2421
2422                         /* Fill next table entry */
2423                         lq_cmd->rs_table[index] =
2424                                         cpu_to_le32(new_rate);
2425                         repeat_rate--;
2426                         index++;
2427                 }
2428
2429                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2430                                          &rate_idx);
2431
2432
2433                 /* Indicate to uCode which entries might be MIMO.
2434                  * If initial rate was MIMO, this will finally end up
2435                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2436                 if (is_mimo(tbl_type.lq_type))
2437                         lq_cmd->mimo_delim = index;
2438
2439                 /* Get next rate */
2440                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2441                                              use_ht_possible);
2442
2443                 /* How many times should we repeat the next rate? */
2444                 if (is_legacy(tbl_type.lq_type)) {
2445                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2446                                 ant_toggle_cnt++;
2447                         else if (mvm &&
2448                                  rs_toggle_antenna(valid_tx_ant,
2449                                                    &new_rate, &tbl_type))
2450                                 ant_toggle_cnt = 1;
2451
2452                         repeat_rate = IWL_NUMBER_TRY;
2453                 } else {
2454                         repeat_rate = IWL_HT_NUMBER_TRY;
2455                 }
2456
2457                 /* Don't allow HT rates after next pass.
2458                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2459                 use_ht_possible = 0;
2460
2461                 /* Override next rate if needed for debug purposes */
2462                 rs_dbgfs_set_mcs(lq_sta, &new_rate);
2463
2464                 /* Fill next table entry */
2465                 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2466
2467                 index++;
2468                 repeat_rate--;
2469         }
2470
2471         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2472         lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2473
2474         lq_cmd->agg_time_limit =
2475                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2476
2477         /*
2478          * overwrite if needed, pass aggregation time limit
2479          * to uCode in uSec - This is racy - but heh, at least it helps...
2480          */
2481         if (mvm && BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD) >= 2)
2482                 lq_cmd->agg_time_limit = cpu_to_le16(1200);
2483 }
2484
2485 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2486 {
2487         return hw->priv;
2488 }
2489 /* rate scale requires free function to be implemented */
2490 static void rs_free(void *mvm_rate)
2491 {
2492         return;
2493 }
2494
2495 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2496                         void *mvm_sta)
2497 {
2498         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2499         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2500
2501         IWL_DEBUG_RATE(mvm, "enter\n");
2502         IWL_DEBUG_RATE(mvm, "leave\n");
2503 }
2504
2505 #ifdef CONFIG_MAC80211_DEBUGFS
2506 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2507                              u32 *rate_n_flags)
2508 {
2509         struct iwl_mvm *mvm;
2510         u8 valid_tx_ant;
2511         u8 ant_sel_tx;
2512
2513         mvm = lq_sta->drv;
2514         valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2515         if (lq_sta->dbg_fixed_rate) {
2516                 ant_sel_tx =
2517                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2518                   >> RATE_MCS_ANT_POS);
2519                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2520                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2521                         IWL_DEBUG_RATE(mvm, "Fixed rate ON\n");
2522                 } else {
2523                         lq_sta->dbg_fixed_rate = 0;
2524                         IWL_ERR(mvm,
2525                                 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2526                                 ant_sel_tx, valid_tx_ant);
2527                         IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2528                 }
2529         } else {
2530                 IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2531         }
2532 }
2533
2534 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2535                         const char __user *user_buf, size_t count, loff_t *ppos)
2536 {
2537         struct iwl_lq_sta *lq_sta = file->private_data;
2538         struct iwl_mvm *mvm;
2539         char buf[64];
2540         size_t buf_size;
2541         u32 parsed_rate;
2542
2543
2544         mvm = lq_sta->drv;
2545         memset(buf, 0, sizeof(buf));
2546         buf_size = min(count, sizeof(buf) -  1);
2547         if (copy_from_user(buf, user_buf, buf_size))
2548                 return -EFAULT;
2549
2550         if (sscanf(buf, "%x", &parsed_rate) == 1)
2551                 lq_sta->dbg_fixed_rate = parsed_rate;
2552         else
2553                 lq_sta->dbg_fixed_rate = 0;
2554
2555         rs_program_fix_rate(mvm, lq_sta);
2556
2557         return count;
2558 }
2559
2560 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2561                         char __user *user_buf, size_t count, loff_t *ppos)
2562 {
2563         char *buff;
2564         int desc = 0;
2565         int i = 0;
2566         int index = 0;
2567         ssize_t ret;
2568
2569         struct iwl_lq_sta *lq_sta = file->private_data;
2570         struct iwl_mvm *mvm;
2571         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2572
2573         mvm = lq_sta->drv;
2574         buff = kmalloc(1024, GFP_KERNEL);
2575         if (!buff)
2576                 return -ENOMEM;
2577
2578         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2579         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2580                         lq_sta->total_failed, lq_sta->total_success,
2581                         lq_sta->active_legacy_rate);
2582         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2583                         lq_sta->dbg_fixed_rate);
2584         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2585             (iwl_fw_valid_tx_ant(mvm->fw) & ANT_A) ? "ANT_A," : "",
2586             (iwl_fw_valid_tx_ant(mvm->fw) & ANT_B) ? "ANT_B," : "",
2587             (iwl_fw_valid_tx_ant(mvm->fw) & ANT_C) ? "ANT_C" : "");
2588         desc += sprintf(buff+desc, "lq type %s\n",
2589            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2590         if (is_Ht(tbl->lq_type)) {
2591                 desc += sprintf(buff+desc, " %s",
2592                    (is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");
2593                    desc += sprintf(buff+desc, " %s",
2594                    (tbl->is_ht40) ? "40MHz" : "20MHz");
2595                    desc += sprintf(buff+desc, " %s %s %s\n",
2596                                    (tbl->is_SGI) ? "SGI" : "",
2597                    (lq_sta->is_green) ? "GF enabled" : "",
2598                    (lq_sta->is_agg) ? "AGG on" : "");
2599         }
2600         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2601                         lq_sta->last_rate_n_flags);
2602         desc += sprintf(buff+desc,
2603                         "general: flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2604                         lq_sta->lq.flags,
2605                         lq_sta->lq.mimo_delim,
2606                         lq_sta->lq.single_stream_ant_msk,
2607                         lq_sta->lq.dual_stream_ant_msk);
2608
2609         desc += sprintf(buff+desc,
2610                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2611                         le16_to_cpu(lq_sta->lq.agg_time_limit),
2612                         lq_sta->lq.agg_disable_start_th,
2613                         lq_sta->lq.agg_frame_cnt_limit);
2614
2615         desc += sprintf(buff+desc,
2616                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2617                         lq_sta->lq.initial_rate_index[0],
2618                         lq_sta->lq.initial_rate_index[1],
2619                         lq_sta->lq.initial_rate_index[2],
2620                         lq_sta->lq.initial_rate_index[3]);
2621
2622         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2623                 index = iwl_hwrate_to_plcp_idx(
2624                         le32_to_cpu(lq_sta->lq.rs_table[i]));
2625                 if (is_legacy(tbl->lq_type)) {
2626                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2627                                         i, le32_to_cpu(lq_sta->lq.rs_table[i]),
2628                                         iwl_rate_mcs[index].mbps);
2629                 } else {
2630                         desc += sprintf(buff+desc,
2631                                         " rate[%d] 0x%X %smbps (%s)\n",
2632                                         i, le32_to_cpu(lq_sta->lq.rs_table[i]),
2633                                         iwl_rate_mcs[index].mbps,
2634                                         iwl_rate_mcs[index].mcs);
2635                 }
2636         }
2637
2638         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2639         kfree(buff);
2640         return ret;
2641 }
2642
2643 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2644         .write = rs_sta_dbgfs_scale_table_write,
2645         .read = rs_sta_dbgfs_scale_table_read,
2646         .open = simple_open,
2647         .llseek = default_llseek,
2648 };
2649 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2650                         char __user *user_buf, size_t count, loff_t *ppos)
2651 {
2652         char *buff;
2653         int desc = 0;
2654         int i, j;
2655         ssize_t ret;
2656
2657         struct iwl_lq_sta *lq_sta = file->private_data;
2658
2659         buff = kmalloc(1024, GFP_KERNEL);
2660         if (!buff)
2661                 return -ENOMEM;
2662
2663         for (i = 0; i < LQ_SIZE; i++) {
2664                 desc += sprintf(buff+desc,
2665                                 "%s type=%d SGI=%d HT40=%d DUP=0 GF=%d\n"
2666                                 "rate=0x%X\n",
2667                                 lq_sta->active_tbl == i ? "*" : "x",
2668                                 lq_sta->lq_info[i].lq_type,
2669                                 lq_sta->lq_info[i].is_SGI,
2670                                 lq_sta->lq_info[i].is_ht40,
2671                                 lq_sta->is_green,
2672                                 lq_sta->lq_info[i].current_rate);
2673                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2674                         desc += sprintf(buff+desc,
2675                                 "counter=%d success=%d %%=%d\n",
2676                                 lq_sta->lq_info[i].win[j].counter,
2677                                 lq_sta->lq_info[i].win[j].success_counter,
2678                                 lq_sta->lq_info[i].win[j].success_ratio);
2679                 }
2680         }
2681         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2682         kfree(buff);
2683         return ret;
2684 }
2685
2686 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2687         .read = rs_sta_dbgfs_stats_table_read,
2688         .open = simple_open,
2689         .llseek = default_llseek,
2690 };
2691
2692 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
2693 {
2694         struct iwl_lq_sta *lq_sta = mvm_sta;
2695         lq_sta->rs_sta_dbgfs_scale_table_file =
2696                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2697                                     lq_sta, &rs_sta_dbgfs_scale_table_ops);
2698         lq_sta->rs_sta_dbgfs_stats_table_file =
2699                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2700                                     lq_sta, &rs_sta_dbgfs_stats_table_ops);
2701         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2702                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2703                                   &lq_sta->tx_agg_tid_en);
2704 }
2705
2706 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
2707 {
2708         struct iwl_lq_sta *lq_sta = mvm_sta;
2709         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2710         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2711         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2712 }
2713 #endif
2714
2715 /*
2716  * Initialization of rate scaling information is done by driver after
2717  * the station is added. Since mac80211 calls this function before a
2718  * station is added we ignore it.
2719  */
2720 static void rs_rate_init_stub(void *mvm_r,
2721                               struct ieee80211_supported_band *sband,
2722                               struct cfg80211_chan_def *chandef,
2723                               struct ieee80211_sta *sta, void *mvm_sta)
2724 {
2725 }
2726 static struct rate_control_ops rs_mvm_ops = {
2727         .module = NULL,
2728         .name = RS_NAME,
2729         .tx_status = rs_tx_status,
2730         .get_rate = rs_get_rate,
2731         .rate_init = rs_rate_init_stub,
2732         .alloc = rs_alloc,
2733         .free = rs_free,
2734         .alloc_sta = rs_alloc_sta,
2735         .free_sta = rs_free_sta,
2736 #ifdef CONFIG_MAC80211_DEBUGFS
2737         .add_sta_debugfs = rs_add_debugfs,
2738         .remove_sta_debugfs = rs_remove_debugfs,
2739 #endif
2740 };
2741
2742 int iwl_mvm_rate_control_register(void)
2743 {
2744         return ieee80211_rate_control_register(&rs_mvm_ops);
2745 }
2746
2747 void iwl_mvm_rate_control_unregister(void)
2748 {
2749         ieee80211_rate_control_unregister(&rs_mvm_ops);
2750 }
2751
2752 /**
2753  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
2754  * Tx protection, according to this rquest and previous requests,
2755  * and send the LQ command.
2756  * @mvmsta: The station
2757  * @enable: Enable Tx protection?
2758  */
2759 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
2760                           bool enable)
2761 {
2762         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
2763
2764         lockdep_assert_held(&mvm->mutex);
2765
2766         if (enable) {
2767                 if (mvmsta->tx_protection == 0)
2768                         lq->flags |= LQ_FLAG_SET_STA_TLC_RTS_MSK;
2769                 mvmsta->tx_protection++;
2770         } else {
2771                 mvmsta->tx_protection--;
2772                 if (mvmsta->tx_protection == 0)
2773                         lq->flags &= ~LQ_FLAG_SET_STA_TLC_RTS_MSK;
2774         }
2775
2776         return iwl_mvm_send_lq_cmd(mvm, lq, CMD_ASYNC, false);
2777 }