Pileus Git - ~andy/linux/blob - 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_6M_INDEX, IWL_RATE_6M_INDEX,
  60         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  61         IWL_RATE_6M_INDEX,
  62         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  63         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  64         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  65         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  66 };
  67
  68 static const u8 ant_toggle_lookup[] = {
  69         /*ANT_NONE -> */ ANT_NONE,
  70         /*ANT_A    -> */ ANT_B,
  71         /*ANT_B    -> */ ANT_C,
  72         /*ANT_AB   -> */ ANT_BC,
  73         /*ANT_C    -> */ ANT_A,
  74         /*ANT_AC   -> */ ANT_AB,
  75         /*ANT_BC   -> */ ANT_AC,
  76         /*ANT_ABC  -> */ ANT_ABC,
  77 };
  78
  79 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
  80         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
  81                                     IWL_RATE_SISO_##s##M_PLCP, \
  82                                     IWL_RATE_MIMO2_##s##M_PLCP,\
  83                                     IWL_RATE_MIMO3_##s##M_PLCP,\
  84                                     IWL_RATE_##r##M_IEEE,      \
  85                                     IWL_RATE_##ip##M_INDEX,    \
  86                                     IWL_RATE_##in##M_INDEX,    \
  87                                     IWL_RATE_##rp##M_INDEX,    \
  88                                     IWL_RATE_##rn##M_INDEX,    \
  89                                     IWL_RATE_##pp##M_INDEX,    \
  90                                     IWL_RATE_##np##M_INDEX }
  91
  92 /*
  93  * Parameter order:
  94  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg 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, INV, 2, INV, 2),    /*  1mbps */
 102         IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
 103         IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
 104         IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
 105         IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
 106         IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
 107         IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
 108         IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
 109         IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
 110         IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
 111         IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
 112         IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
 113         IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 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                 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
 132                         idx = idx - IWL_RATE_MIMO3_6M_PLCP;
 133                 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
 134                         idx = idx - IWL_RATE_MIMO2_6M_PLCP;
 135
 136                 idx += IWL_FIRST_OFDM_RATE;
 137                 /* skip 9M not supported in ht*/
 138                 if (idx >= IWL_RATE_9M_INDEX)
 139                         idx += 1;
 140                 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
 141                         return idx;
 142
 143         /* legacy rate format, search for match in table */
 144         } else {
 145                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 146                         if (iwl_rates[idx].plcp ==
 147                                         rs_extract_rate(rate_n_flags))
 148                                 return idx;
 149         }
 150
 151         return -1;
 152 }
 153
 154 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 155                                    struct sk_buff *skb,
 156                                    struct ieee80211_sta *sta,
 157                                    struct iwl_lq_sta *lq_sta);
 158 static void rs_fill_link_cmd(struct iwl_mvm *mvm,
 159                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 160 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 161
 162
 163 #ifdef CONFIG_MAC80211_DEBUGFS
 164 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 165                              u32 *rate_n_flags, int index);
 166 #else
 167 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 168                              u32 *rate_n_flags, int index)
 169 {}
 170 #endif
 171
 172 /**
 173  * The following tables contain the expected throughput metrics for all rates
 174  *
 175  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 176  *
 177  * where invalid entries are zeros.
 178  *
 179  * CCK rates are only valid in legacy table and will only be used in G
 180  * (2.4 GHz) band.
 181  */
 182
 183 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
 184         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 185 };
 186
 187 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
 188         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202}, /* Norm */
 189         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210}, /* SGI */
 190         {0, 0, 0, 0, 47, 0,  91, 133, 171, 242, 305, 334, 362}, /* AGG */
 191         {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
 192 };
 193
 194 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
 195         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 196         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 197         {0, 0, 0, 0,  94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
 198         {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
 199 };
 200
 201 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 202         {0, 0, 0, 0,  74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
 203         {0, 0, 0, 0,  81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
 204         {0, 0, 0, 0,  89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
 205         {0, 0, 0, 0,  97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
 206 };
 207
 208 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 209         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
 210         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
 211         {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
 212         {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
 213 };
 214
 215 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
 216         {0, 0, 0, 0,  99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
 217         {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
 218         {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
 219         {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
 220 };
 221
 222 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
 223         {0, 0, 0, 0, 152, 0, 211, 239, 255, 279,  290,  294,  297}, /* Norm */
 224         {0, 0, 0, 0, 160, 0, 219, 245, 261, 284,  294,  297,  300}, /* SGI */
 225         {0, 0, 0, 0, 254, 0, 443, 584, 695, 868,  984, 1030, 1070}, /* AGG */
 226         {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
 227 };
 228
 229 /* mbps, mcs */
 230 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 231         {  "1", "BPSK DSSS"},
 232         {  "2", "QPSK DSSS"},
 233         {"5.5", "BPSK CCK"},
 234         { "11", "QPSK CCK"},
 235         {  "6", "BPSK 1/2"},
 236         {  "9", "BPSK 1/2"},
 237         { "12", "QPSK 1/2"},
 238         { "18", "QPSK 3/4"},
 239         { "24", "16QAM 1/2"},
 240         { "36", "16QAM 3/4"},
 241         { "48", "64QAM 2/3"},
 242         { "54", "64QAM 3/4"},
 243         { "60", "64QAM 5/6"},
 244 };
 245
 246 #define MCS_INDEX_PER_STREAM    (8)
 247
 248 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 249 {
 250         window->data = 0;
 251         window->success_counter = 0;
 252         window->success_ratio = IWL_INVALID_VALUE;
 253         window->counter = 0;
 254         window->average_tpt = IWL_INVALID_VALUE;
 255         window->stamp = 0;
 256 }
 257
 258 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 259 {
 260         return (ant_type & valid_antenna) == ant_type;
 261 }
 262
 263 /*
 264  *      removes the old data from the statistics. All data that is older than
 265  *      TID_MAX_TIME_DIFF, will be deleted.
 266  */
 267 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 268 {
 269         /* The oldest age we want to keep */
 270         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 271
 272         while (tl->queue_count &&
 273                (tl->time_stamp < oldest_time)) {
 274                 tl->total -= tl->packet_count[tl->head];
 275                 tl->packet_count[tl->head] = 0;
 276                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 277                 tl->queue_count--;
 278                 tl->head++;
 279                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 280                         tl->head = 0;
 281         }
 282 }
 283
 284 /*
 285  *      increment traffic load value for tid and also remove
 286  *      any old values if passed the certain time period
 287  */
 288 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 289                            struct ieee80211_hdr *hdr)
 290 {
 291         u32 curr_time = jiffies_to_msecs(jiffies);
 292         u32 time_diff;
 293         s32 index;
 294         struct iwl_traffic_load *tl = NULL;
 295         u8 tid;
 296
 297         if (ieee80211_is_data_qos(hdr->frame_control)) {
 298                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 299                 tid = qc[0] & 0xf;
 300         } else {
 301                 return IWL_MAX_TID_COUNT;
 302         }
 303
 304         if (unlikely(tid >= IWL_MAX_TID_COUNT))
 305                 return IWL_MAX_TID_COUNT;
 306
 307         tl = &lq_data->load[tid];
 308
 309         curr_time -= curr_time % TID_ROUND_VALUE;
 310
 311         /* Happens only for the first packet. Initialize the data */
 312         if (!(tl->queue_count)) {
 313                 tl->total = 1;
 314                 tl->time_stamp = curr_time;
 315                 tl->queue_count = 1;
 316                 tl->head = 0;
 317                 tl->packet_count[0] = 1;
 318                 return IWL_MAX_TID_COUNT;
 319         }
 320
 321         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 322         index = time_diff / TID_QUEUE_CELL_SPACING;
 323
 324         /* The history is too long: remove data that is older than */
 325         /* TID_MAX_TIME_DIFF */
 326         if (index >= TID_QUEUE_MAX_SIZE)
 327                 rs_tl_rm_old_stats(tl, curr_time);
 328
 329         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 330         tl->packet_count[index] = tl->packet_count[index] + 1;
 331         tl->total = tl->total + 1;
 332
 333         if ((index + 1) > tl->queue_count)
 334                 tl->queue_count = index + 1;
 335
 336         return tid;
 337 }
 338
 339 #ifdef CONFIG_MAC80211_DEBUGFS
 340 /**
 341  * Program the device to use fixed rate for frame transmit
 342  * This is for debugging/testing only
 343  * once the device start use fixed rate, we need to reload the module
 344  * to being back the normal operation.
 345  */
 346 static void rs_program_fix_rate(struct iwl_mvm *mvm,
 347                                 struct iwl_lq_sta *lq_sta)
 348 {
 349         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
 350         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 351         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 352         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 353
 354         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
 355                        lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
 356
 357         if (lq_sta->dbg_fixed_rate) {
 358                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
 359                 iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
 360         }
 361 }
 362 #endif
 363
 364 /*
 365         get the traffic load value for tid
 366 */
 367 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 368 {
 369         u32 curr_time = jiffies_to_msecs(jiffies);
 370         u32 time_diff;
 371         s32 index;
 372         struct iwl_traffic_load *tl = NULL;
 373
 374         if (tid >= IWL_MAX_TID_COUNT)
 375                 return 0;
 376
 377         tl = &(lq_data->load[tid]);
 378
 379         curr_time -= curr_time % TID_ROUND_VALUE;
 380
 381         if (!(tl->queue_count))
 382                 return 0;
 383
 384         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 385         index = time_diff / TID_QUEUE_CELL_SPACING;
 386
 387         /* The history is too long: remove data that is older than */
 388         /* TID_MAX_TIME_DIFF */
 389         if (index >= TID_QUEUE_MAX_SIZE)
 390                 rs_tl_rm_old_stats(tl, curr_time);
 391
 392         return tl->total;
 393 }
 394
 395 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 396                                       struct iwl_lq_sta *lq_data, u8 tid,
 397                                       struct ieee80211_sta *sta)
 398 {
 399         int ret = -EAGAIN;
 400         u32 load;
 401
 402         load = rs_tl_get_load(lq_data, tid);
 403
 404         /*
 405          * Don't create TX aggregation sessions when in high
 406          * BT traffic, as they would just be disrupted by BT.
 407          */
 408         if (BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD) >= 2) {
 409                 IWL_DEBUG_COEX(mvm, "BT traffic (%d), no aggregation allowed\n",
 410                                BT_MBOX_MSG(&mvm->last_bt_notif,
 411                                            3, TRAFFIC_LOAD));
 412                 return ret;
 413         }
 414
 415         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 416                      sta->addr, tid);
 417         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 418         if (ret == -EAGAIN) {
 419                 /*
 420                  * driver and mac80211 is out of sync
 421                  * this might be cause by reloading firmware
 422                  * stop the tx ba session here
 423                  */
 424                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 425                         tid);
 426                 ieee80211_stop_tx_ba_session(sta, tid);
 427         }
 428         return ret;
 429 }
 430
 431 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 432                               struct iwl_lq_sta *lq_data,
 433                               struct ieee80211_sta *sta)
 434 {
 435         if (tid < IWL_MAX_TID_COUNT)
 436                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 437         else
 438                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 439                         tid, IWL_MAX_TID_COUNT);
 440 }
 441
 442 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 443 {
 444         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 445                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 446                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 447 }
 448
 449 /*
 450  * Static function to get the expected throughput from an iwl_scale_tbl_info
 451  * that wraps a NULL pointer check
 452  */
 453 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 454 {
 455         if (tbl->expected_tpt)
 456                 return tbl->expected_tpt[rs_index];
 457         return 0;
 458 }
 459
 460 /**
 461  * rs_collect_tx_data - Update the success/failure sliding window
 462  *
 463  * We keep a sliding window of the last 62 packets transmitted
 464  * at this rate.  window->data contains the bitmask of successful
 465  * packets.
 466  */
 467 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 468                               int scale_index, int attempts, int successes)
 469 {
 470         struct iwl_rate_scale_data *window = NULL;
 471         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 472         s32 fail_count, tpt;
 473
 474         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 475                 return -EINVAL;
 476
 477         /* Select window for current tx bit rate */
 478         window = &(tbl->win[scale_index]);
 479
 480         /* Get expected throughput */
 481         tpt = get_expected_tpt(tbl, scale_index);
 482
 483         /*
 484          * Keep track of only the latest 62 tx frame attempts in this rate's
 485          * history window; anything older isn't really relevant any more.
 486          * If we have filled up the sliding window, drop the oldest attempt;
 487          * if the oldest attempt (highest bit in bitmap) shows "success",
 488          * subtract "1" from the success counter (this is the main reason
 489          * we keep these bitmaps!).
 490          */
 491         while (attempts > 0) {
 492                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 493                         /* remove earliest */
 494                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 495
 496                         if (window->data & mask) {
 497                                 window->data &= ~mask;
 498                                 window->success_counter--;
 499                         }
 500                 }
 501
 502                 /* Increment frames-attempted counter */
 503                 window->counter++;
 504
 505                 /* Shift bitmap by one frame to throw away oldest history */
 506                 window->data <<= 1;
 507
 508                 /* Mark the most recent #successes attempts as successful */
 509                 if (successes > 0) {
 510                         window->success_counter++;
 511                         window->data |= 0x1;
 512                         successes--;
 513                 }
 514
 515                 attempts--;
 516         }
 517
 518         /* Calculate current success ratio, avoid divide-by-0! */
 519         if (window->counter > 0)
 520                 window->success_ratio = 128 * (100 * window->success_counter)
 521                                         / window->counter;
 522         else
 523                 window->success_ratio = IWL_INVALID_VALUE;
 524
 525         fail_count = window->counter - window->success_counter;
 526
 527         /* Calculate average throughput, if we have enough history. */
 528         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 529             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 530                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 531         else
 532                 window->average_tpt = IWL_INVALID_VALUE;
 533
 534         /* Tag this window as having been updated */
 535         window->stamp = jiffies;
 536
 537         return 0;
 538 }
 539
 540 /*
 541  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 542  */
 543 /* FIXME:RS:remove this function and put the flags statically in the table */
 544 static u32 rate_n_flags_from_tbl(struct iwl_mvm *mvm,
 545                                  struct iwl_scale_tbl_info *tbl,
 546                                  int index, u8 use_green)
 547 {
 548         u32 rate_n_flags = 0;
 549
 550         if (is_legacy(tbl->lq_type)) {
 551                 rate_n_flags = iwl_rates[index].plcp;
 552                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 553                         rate_n_flags |= RATE_MCS_CCK_MSK;
 554         } else if (is_Ht(tbl->lq_type)) {
 555                 if (index > IWL_LAST_OFDM_RATE) {
 556                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 557                         index = IWL_LAST_OFDM_RATE;
 558                 }
 559                 rate_n_flags = RATE_MCS_HT_MSK;
 560
 561                 if (is_siso(tbl->lq_type))
 562                         rate_n_flags |= iwl_rates[index].plcp_siso;
 563                 else if (is_mimo2(tbl->lq_type))
 564                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 565                 else
 566                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 567         } else {
 568                 IWL_ERR(mvm, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 569         }
 570
 571         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 572                                                      RATE_MCS_ANT_ABC_MSK);
 573
 574         if (is_Ht(tbl->lq_type)) {
 575                 if (tbl->is_ht40)
 576                         rate_n_flags |= RATE_MCS_CHAN_WIDTH_40;
 577                 if (tbl->is_SGI)
 578                         rate_n_flags |= RATE_MCS_SGI_MSK;
 579
 580                 if (use_green) {
 581                         rate_n_flags |= RATE_HT_MCS_GF_MSK;
 582                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 583                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 584                                 IWL_ERR(mvm, "GF was set with SGI:SISO\n");
 585                         }
 586                 }
 587         }
 588         return rate_n_flags;
 589 }
 590
 591 /*
 592  * Interpret uCode API's rate_n_flags format,
 593  * fill "search" or "active" tx mode table.
 594  */
 595 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 596                                     enum ieee80211_band band,
 597                                     struct iwl_scale_tbl_info *tbl,
 598                                     int *rate_idx)
 599 {
 600         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 601         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 602         u8 mcs;
 603
 604         memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
 605         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 606
 607         if (*rate_idx  == IWL_RATE_INVALID) {
 608                 *rate_idx = -1;
 609                 return -EINVAL;
 610         }
 611         tbl->is_SGI = 0;        /* default legacy setup */
 612         tbl->is_ht40 = 0;
 613         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 614         tbl->lq_type = LQ_NONE;
 615         tbl->max_search = IWL_MAX_SEARCH;
 616
 617         /* legacy rate format */
 618         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 619                 if (num_of_ant == 1) {
 620                         if (band == IEEE80211_BAND_5GHZ)
 621                                 tbl->lq_type = LQ_A;
 622                         else
 623                                 tbl->lq_type = LQ_G;
 624                 }
 625         /* HT rate format */
 626         } else {
 627                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 628                         tbl->is_SGI = 1;
 629
 630                 if (rate_n_flags & RATE_MCS_CHAN_WIDTH_40) /* TODO */
 631                         tbl->is_ht40 = 1;
 632
 633                 mcs = rs_extract_rate(rate_n_flags);
 634
 635                 /* SISO */
 636                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 637                         if (num_of_ant == 1)
 638                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 639                 /* MIMO2 */
 640                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 641                         if (num_of_ant == 2)
 642                                 tbl->lq_type = LQ_MIMO2;
 643                 /* MIMO3 */
 644                 } else {
 645                         if (num_of_ant == 3) {
 646                                 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
 647                                 tbl->lq_type = LQ_MIMO3;
 648                         }
 649                 }
 650         }
 651         return 0;
 652 }
 653
 654 /* switch to another antenna/antennas and return 1 */
 655 /* if no other valid antenna found, return 0 */
 656 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 657                              struct iwl_scale_tbl_info *tbl)
 658 {
 659         u8 new_ant_type;
 660
 661         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 662                 return 0;
 663
 664         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 665                 return 0;
 666
 667         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 668
 669         while ((new_ant_type != tbl->ant_type) &&
 670                !rs_is_valid_ant(valid_ant, new_ant_type))
 671                 new_ant_type = ant_toggle_lookup[new_ant_type];
 672
 673         if (new_ant_type == tbl->ant_type)
 674                 return 0;
 675
 676         tbl->ant_type = new_ant_type;
 677         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 678         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 679         return 1;
 680 }
 681
 682 /**
 683  * Green-field mode is valid if the station supports it and
 684  * there are no non-GF stations present in the BSS.
 685  */
 686 static bool rs_use_green(struct ieee80211_sta *sta)
 687 {
 688         /*
 689          * There's a bug somewhere in this code that causes the
 690          * scaling to get stuck because GF+SGI can't be combined
 691          * in SISO rates. Until we find that bug, disable GF, it
 692          * has only limited benefit and we still interoperate with
 693          * GF APs since we can always receive GF transmissions.
 694          */
 695         return false;
 696 }
 697
 698 /**
 699  * rs_get_supported_rates - get the available rates
 700  *
 701  * if management frame or broadcast frame only return
 702  * basic available rates.
 703  *
 704  */
 705 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 706                                   struct ieee80211_hdr *hdr,
 707                                   enum iwl_table_type rate_type)
 708 {
 709         if (is_legacy(rate_type)) {
 710                 return lq_sta->active_legacy_rate;
 711         } else {
 712                 if (is_siso(rate_type))
 713                         return lq_sta->active_siso_rate;
 714                 else if (is_mimo2(rate_type))
 715                         return lq_sta->active_mimo2_rate;
 716                 else
 717                         return lq_sta->active_mimo3_rate;
 718         }
 719 }
 720
 721 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 722                                 int rate_type)
 723 {
 724         u8 high = IWL_RATE_INVALID;
 725         u8 low = IWL_RATE_INVALID;
 726
 727         /* 802.11A or ht walks to the next literal adjacent rate in
 728          * the rate table */
 729         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 730                 int i;
 731                 u32 mask;
 732
 733                 /* Find the previous rate that is in the rate mask */
 734                 i = index - 1;
 735                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 736                         if (rate_mask & mask) {
 737                                 low = i;
 738                                 break;
 739                         }
 740                 }
 741
 742                 /* Find the next rate that is in the rate mask */
 743                 i = index + 1;
 744                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 745                         if (rate_mask & mask) {
 746                                 high = i;
 747                                 break;
 748                         }
 749                 }
 750
 751                 return (high << 8) | low;
 752         }
 753
 754         low = index;
 755         while (low != IWL_RATE_INVALID) {
 756                 low = iwl_rates[low].prev_rs;
 757                 if (low == IWL_RATE_INVALID)
 758                         break;
 759                 if (rate_mask & (1 << low))
 760                         break;
 761                 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
 762         }
 763
 764         high = index;
 765         while (high != IWL_RATE_INVALID) {
 766                 high = iwl_rates[high].next_rs;
 767                 if (high == IWL_RATE_INVALID)
 768                         break;
 769                 if (rate_mask & (1 << high))
 770                         break;
 771                 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
 772         }
 773
 774         return (high << 8) | low;
 775 }
 776
 777 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 778                              struct iwl_scale_tbl_info *tbl,
 779                              u8 scale_index, u8 ht_possible)
 780 {
 781         s32 low;
 782         u16 rate_mask;
 783         u16 high_low;
 784         u8 switch_to_legacy = 0;
 785         u8 is_green = lq_sta->is_green;
 786         struct iwl_mvm *mvm = lq_sta->drv;
 787
 788         /* check if we need to switch from HT to legacy rates.
 789          * assumption is that mandatory rates (1Mbps or 6Mbps)
 790          * are always supported (spec demand) */
 791         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 792                 switch_to_legacy = 1;
 793                 scale_index = rs_ht_to_legacy[scale_index];
 794                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 795                         tbl->lq_type = LQ_A;
 796                 else
 797                         tbl->lq_type = LQ_G;
 798
 799                 if (num_of_ant(tbl->ant_type) > 1)
 800                         tbl->ant_type =
 801                             first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
 802
 803                 tbl->is_ht40 = 0;
 804                 tbl->is_SGI = 0;
 805                 tbl->max_search = IWL_MAX_SEARCH;
 806         }
 807
 808         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 809
 810         /* Mask with station rate restriction */
 811         if (is_legacy(tbl->lq_type)) {
 812                 /* supp_rates has no CCK bits in A mode */
 813                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 814                         rate_mask  = (u16)(rate_mask &
 815                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 816                 else
 817                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 818         }
 819
 820         /* If we switched from HT to legacy, check current rate */
 821         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 822                 low = scale_index;
 823                 goto out;
 824         }
 825
 826         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 827                                         tbl->lq_type);
 828         low = high_low & 0xff;
 829
 830         if (low == IWL_RATE_INVALID)
 831                 low = scale_index;
 832
 833 out:
 834         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 835 }
 836
 837 /*
 838  * Simple function to compare two rate scale table types
 839  */
 840 static bool table_type_matches(struct iwl_scale_tbl_info *a,
 841                                struct iwl_scale_tbl_info *b)
 842 {
 843         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 844                 (a->is_SGI == b->is_SGI);
 845 }
 846
 847 /*
 848  * mac80211 sends us Tx status
 849  */
 850 static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
 851                          struct ieee80211_sta *sta, void *priv_sta,
 852                          struct sk_buff *skb)
 853 {
 854         int legacy_success;
 855         int retries;
 856         int rs_index, mac_index, i;
 857         struct iwl_lq_sta *lq_sta = priv_sta;
 858         struct iwl_lq_cmd *table;
 859         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 860         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
 861         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 862         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 863         enum mac80211_rate_control_flags mac_flags;
 864         u32 tx_rate;
 865         struct iwl_scale_tbl_info tbl_type;
 866         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 867
 868         IWL_DEBUG_RATE_LIMIT(mvm,
 869                              "get frame ack response, update rate scale window\n");
 870
 871         /* Treat uninitialized rate scaling data same as non-existing. */
 872         if (!lq_sta) {
 873                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
 874                 return;
 875         } else if (!lq_sta->drv) {
 876                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
 877                 return;
 878         }
 879
 880         if (!ieee80211_is_data(hdr->frame_control) ||
 881             info->flags & IEEE80211_TX_CTL_NO_ACK)
 882                 return;
 883
 884         /* This packet was aggregated but doesn't carry status info */
 885         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 886             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 887                 return;
 888
 889         /*
 890          * Ignore this Tx frame response if its initial rate doesn't match
 891          * that of latest Link Quality command.  There may be stragglers
 892          * from a previous Link Quality command, but we're no longer interested
 893          * in those; they're either from the "active" mode while we're trying
 894          * to check "search" mode, or a prior "search" mode after we've moved
 895          * to a new "search" mode (which might become the new "active" mode).
 896          */
 897         table = &lq_sta->lq;
 898         tx_rate = le32_to_cpu(table->rs_table[0]);
 899         rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type, &rs_index);
 900         if (info->band == IEEE80211_BAND_5GHZ)
 901                 rs_index -= IWL_FIRST_OFDM_RATE;
 902         mac_flags = info->status.rates[0].flags;
 903         mac_index = info->status.rates[0].idx;
 904         /* For HT packets, map MCS to PLCP */
 905         if (mac_flags & IEEE80211_TX_RC_MCS) {
 906                 /* Remove # of streams */
 907                 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
 908                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 909                         mac_index++;
 910                 /*
 911                  * mac80211 HT index is always zero-indexed; we need to move
 912                  * HT OFDM rates after CCK rates in 2.4 GHz band
 913                  */
 914                 if (info->band == IEEE80211_BAND_2GHZ)
 915                         mac_index += IWL_FIRST_OFDM_RATE;
 916         }
 917         /* Here we actually compare this rate to the latest LQ command */
 918         if ((mac_index < 0) ||
 919             (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 920             (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 921             (tbl_type.ant_type != info->status.antenna) ||
 922             (!!(tx_rate & RATE_MCS_HT_MSK) !=
 923                                 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 924             (!!(tx_rate & RATE_HT_MCS_GF_MSK) !=
 925                                 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 926             (rs_index != mac_index)) {
 927                 IWL_DEBUG_RATE(mvm,
 928                                "initial rate %d does not match %d (0x%x)\n",
 929                                mac_index, rs_index, tx_rate);
 930                 /*
 931                  * Since rates mis-match, the last LQ command may have failed.
 932                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 933                  * ... driver.
 934                  */
 935                 lq_sta->missed_rate_counter++;
 936                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 937                         lq_sta->missed_rate_counter = 0;
 938                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
 939                 }
 940                 /* Regardless, ignore this status info for outdated rate */
 941                 return;
 942         } else
 943                 /* Rate did match, so reset the missed_rate_counter */
 944                 lq_sta->missed_rate_counter = 0;
 945
 946         /* Figure out if rate scale algorithm is in active or search table */
 947         if (table_type_matches(&tbl_type,
 948                                &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 949                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 950                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 951         } else if (table_type_matches(
 952                         &tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
 953                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 954                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 955         } else {
 956                 IWL_DEBUG_RATE(mvm,
 957                                "Neither active nor search matches tx rate\n");
 958                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 959                 IWL_DEBUG_RATE(mvm, "active- lq:%x, ant:%x, SGI:%d\n",
 960                                tmp_tbl->lq_type, tmp_tbl->ant_type,
 961                                tmp_tbl->is_SGI);
 962                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 963                 IWL_DEBUG_RATE(mvm, "search- lq:%x, ant:%x, SGI:%d\n",
 964                                tmp_tbl->lq_type, tmp_tbl->ant_type,
 965                                tmp_tbl->is_SGI);
 966                 IWL_DEBUG_RATE(mvm, "actual- lq:%x, ant:%x, SGI:%d\n",
 967                                tbl_type.lq_type, tbl_type.ant_type,
 968                                tbl_type.is_SGI);
 969                 /*
 970                  * no matching table found, let's by-pass the data collection
 971                  * and continue to perform rate scale to find the rate table
 972                  */
 973                 rs_stay_in_table(lq_sta, true);
 974                 goto done;
 975         }
 976
 977         /*
 978          * Updating the frame history depends on whether packets were
 979          * aggregated.
 980          *
 981          * For aggregation, all packets were transmitted at the same rate, the
 982          * first index into rate scale table.
 983          */
 984         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
 985                 tx_rate = le32_to_cpu(table->rs_table[0]);
 986                 rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type,
 987                                          &rs_index);
 988                 rs_collect_tx_data(curr_tbl, rs_index,
 989                                    info->status.ampdu_len,
 990                                    info->status.ampdu_ack_len);
 991
 992                 /* Update success/fail counts if not searching for new mode */
 993                 if (lq_sta->stay_in_tbl) {
 994                         lq_sta->total_success += info->status.ampdu_ack_len;
 995                         lq_sta->total_failed += (info->status.ampdu_len -
 996                                         info->status.ampdu_ack_len);
 997                 }
 998         } else {
 999         /*
1000          * For legacy, update frame history with for each Tx retry.
1001          */
1002                 retries = info->status.rates[0].count - 1;
1003                 /* HW doesn't send more than 15 retries */
1004                 retries = min(retries, 15);
1005
1006                 /* The last transmission may have been successful */
1007                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1008                 /* Collect data for each rate used during failed TX attempts */
1009                 for (i = 0; i <= retries; ++i) {
1010                         tx_rate = le32_to_cpu(table->rs_table[i]);
1011                         rs_get_tbl_info_from_mcs(tx_rate, info->band,
1012                                                  &tbl_type, &rs_index);
1013                         /*
1014                          * Only collect stats if retried rate is in the same RS
1015                          * table as active/search.
1016                          */
1017                         if (table_type_matches(&tbl_type, curr_tbl))
1018                                 tmp_tbl = curr_tbl;
1019                         else if (table_type_matches(&tbl_type, other_tbl))
1020                                 tmp_tbl = other_tbl;
1021                         else
1022                                 continue;
1023                         rs_collect_tx_data(tmp_tbl, rs_index, 1,
1024                                            i < retries ? 0 : legacy_success);
1025                 }
1026
1027                 /* Update success/fail counts if not searching for new mode */
1028                 if (lq_sta->stay_in_tbl) {
1029                         lq_sta->total_success += legacy_success;
1030                         lq_sta->total_failed += retries + (1 - legacy_success);
1031                 }
1032         }
1033         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1034         lq_sta->last_rate_n_flags = tx_rate;
1035 done:
1036         /* See if there's a better rate or modulation mode to try. */
1037         if (sta && sta->supp_rates[sband->band])
1038                 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
1039 }
1040
1041 /*
1042  * Begin a period of staying with a selected modulation mode.
1043  * Set "stay_in_tbl" flag to prevent any mode switches.
1044  * Set frame tx success limits according to legacy vs. high-throughput,
1045  * and reset overall (spanning all rates) tx success history statistics.
1046  * These control how long we stay using same modulation mode before
1047  * searching for a new mode.
1048  */
1049 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1050                                  struct iwl_lq_sta *lq_sta)
1051 {
1052         IWL_DEBUG_RATE(mvm, "we are staying in the same table\n");
1053         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1054         if (is_legacy) {
1055                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1056                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1057                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1058         } else {
1059                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1060                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1061                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1062         }
1063         lq_sta->table_count = 0;
1064         lq_sta->total_failed = 0;
1065         lq_sta->total_success = 0;
1066         lq_sta->flush_timer = jiffies;
1067         lq_sta->action_counter = 0;
1068 }
1069
1070 /*
1071  * Find correct throughput table for given mode of modulation
1072  */
1073 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1074                                       struct iwl_scale_tbl_info *tbl)
1075 {
1076         /* Used to choose among HT tables */
1077         s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1078
1079         /* Check for invalid LQ type */
1080         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1081                 tbl->expected_tpt = expected_tpt_legacy;
1082                 return;
1083         }
1084
1085         /* Legacy rates have only one table */
1086         if (is_legacy(tbl->lq_type)) {
1087                 tbl->expected_tpt = expected_tpt_legacy;
1088                 return;
1089         }
1090
1091         /* Choose among many HT tables depending on number of streams
1092          * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1093          * status */
1094         if (is_siso(tbl->lq_type) && !tbl->is_ht40)
1095                 ht_tbl_pointer = expected_tpt_siso20MHz;
1096         else if (is_siso(tbl->lq_type))
1097                 ht_tbl_pointer = expected_tpt_siso40MHz;
1098         else if (is_mimo2(tbl->lq_type) && !tbl->is_ht40)
1099                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1100         else if (is_mimo2(tbl->lq_type))
1101                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1102         else if (is_mimo3(tbl->lq_type) && !tbl->is_ht40)
1103                 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1104         else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1105                 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1106
1107         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
1108                 tbl->expected_tpt = ht_tbl_pointer[0];
1109         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1110                 tbl->expected_tpt = ht_tbl_pointer[1];
1111         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1112                 tbl->expected_tpt = ht_tbl_pointer[2];
1113         else                                            /* AGG+SGI */
1114                 tbl->expected_tpt = ht_tbl_pointer[3];
1115 }
1116
1117 /*
1118  * Find starting rate for new "search" high-throughput mode of modulation.
1119  * Goal is to find lowest expected rate (under perfect conditions) that is
1120  * above the current measured throughput of "active" mode, to give new mode
1121  * a fair chance to prove itself without too many challenges.
1122  *
1123  * This gets called when transitioning to more aggressive modulation
1124  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1125  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1126  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1127  * bit rate will typically need to increase, but not if performance was bad.
1128  */
1129 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1130                             struct iwl_lq_sta *lq_sta,
1131                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1132                             u16 rate_mask, s8 index)
1133 {
1134         /* "active" values */
1135         struct iwl_scale_tbl_info *active_tbl =
1136             &(lq_sta->lq_info[lq_sta->active_tbl]);
1137         s32 active_sr = active_tbl->win[index].success_ratio;
1138         s32 active_tpt = active_tbl->expected_tpt[index];
1139
1140         /* expected "search" throughput */
1141         s32 *tpt_tbl = tbl->expected_tpt;
1142
1143         s32 new_rate, high, low, start_hi;
1144         u16 high_low;
1145         s8 rate = index;
1146
1147         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1148
1149         while (1) {
1150                 high_low = rs_get_adjacent_rate(mvm, rate, rate_mask,
1151                                                 tbl->lq_type);
1152
1153                 low = high_low & 0xff;
1154                 high = (high_low >> 8) & 0xff;
1155
1156                 /*
1157                  * Lower the "search" bit rate, to give new "search" mode
1158                  * approximately the same throughput as "active" if:
1159                  *
1160                  * 1) "Active" mode has been working modestly well (but not
1161                  *    great), and expected "search" throughput (under perfect
1162                  *    conditions) at candidate rate is above the actual
1163                  *    measured "active" throughput (but less than expected
1164                  *    "active" throughput under perfect conditions).
1165                  * OR
1166                  * 2) "Active" mode has been working perfectly or very well
1167                  *    and expected "search" throughput (under perfect
1168                  *    conditions) at candidate rate is above expected
1169                  *    "active" throughput (under perfect conditions).
1170                  */
1171                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1172                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1173                       (active_sr <= IWL_RATE_HIGH_TH) &&
1174                       (tpt_tbl[rate] <= active_tpt))) ||
1175                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1176                      (tpt_tbl[rate] > active_tpt))) {
1177                         /* (2nd or later pass)
1178                          * If we've already tried to raise the rate, and are
1179                          * now trying to lower it, use the higher rate. */
1180                         if (start_hi != IWL_RATE_INVALID) {
1181                                 new_rate = start_hi;
1182                                 break;
1183                         }
1184
1185                         new_rate = rate;
1186
1187                         /* Loop again with lower rate */
1188                         if (low != IWL_RATE_INVALID)
1189                                 rate = low;
1190
1191                         /* Lower rate not available, use the original */
1192                         else
1193                                 break;
1194
1195                 /* Else try to raise the "search" rate to match "active" */
1196                 } else {
1197                         /* (2nd or later pass)
1198                          * If we've already tried to lower the rate, and are
1199                          * now trying to raise it, use the lower rate. */
1200                         if (new_rate != IWL_RATE_INVALID)
1201                                 break;
1202
1203                         /* Loop again with higher rate */
1204                         else if (high != IWL_RATE_INVALID) {
1205                                 start_hi = high;
1206                                 rate = high;
1207
1208                         /* Higher rate not available, use the original */
1209                         } else {
1210                                 new_rate = rate;
1211                                 break;
1212                         }
1213                 }
1214         }
1215
1216         return new_rate;
1217 }
1218
1219 static bool iwl_is_ht40_tx_allowed(struct ieee80211_sta *sta)
1220 {
1221         return sta->bandwidth >= IEEE80211_STA_RX_BW_40;
1222 }
1223
1224 /*
1225  * Set up search table for MIMO2
1226  */
1227 static int rs_switch_to_mimo2(struct iwl_mvm *mvm,
1228                              struct iwl_lq_sta *lq_sta,
1229                              struct ieee80211_sta *sta,
1230                              struct iwl_scale_tbl_info *tbl, int index)
1231 {
1232         u16 rate_mask;
1233         s32 rate;
1234         s8 is_green = lq_sta->is_green;
1235
1236         if (!sta->ht_cap.ht_supported)
1237                 return -1;
1238
1239         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1240                 return -1;
1241
1242         /* Need both Tx chains/antennas to support MIMO */
1243         if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) < 2)
1244                 return -1;
1245
1246         IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO2\n");
1247
1248         tbl->lq_type = LQ_MIMO2;
1249         tbl->action = 0;
1250         tbl->max_search = IWL_MAX_SEARCH;
1251         rate_mask = lq_sta->active_mimo2_rate;
1252
1253         if (iwl_is_ht40_tx_allowed(sta))
1254                 tbl->is_ht40 = 1;
1255         else
1256                 tbl->is_ht40 = 0;
1257
1258         rs_set_expected_tpt_table(lq_sta, tbl);
1259
1260         rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1261
1262         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 best rate %d mask %X\n",
1263                        rate, rate_mask);
1264         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1265                 IWL_DEBUG_RATE(mvm, "Can't switch with index %d rate mask %x\n",
1266                                rate, rate_mask);
1267                 return -1;
1268         }
1269         tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green);
1270
1271         IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n",
1272                        tbl->current_rate, is_green);
1273         return 0;
1274 }
1275
1276 /*
1277  * Set up search table for MIMO3
1278  */
1279 static int rs_switch_to_mimo3(struct iwl_mvm *mvm,
1280                              struct iwl_lq_sta *lq_sta,
1281                              struct ieee80211_sta *sta,
1282                              struct iwl_scale_tbl_info *tbl, int index)
1283 {
1284         u16 rate_mask;
1285         s32 rate;
1286         s8 is_green = lq_sta->is_green;
1287
1288         if (!sta->ht_cap.ht_supported)
1289                 return -1;
1290
1291         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1292                 return -1;
1293
1294         /* Need both Tx chains/antennas to support MIMO */
1295         if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) < 3)
1296                 return -1;
1297
1298         IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO3\n");
1299
1300         tbl->lq_type = LQ_MIMO3;
1301         tbl->action = 0;
1302         tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1303         rate_mask = lq_sta->active_mimo3_rate;
1304
1305         if (iwl_is_ht40_tx_allowed(sta))
1306                 tbl->is_ht40 = 1;
1307         else
1308                 tbl->is_ht40 = 0;
1309
1310         rs_set_expected_tpt_table(lq_sta, tbl);
1311
1312         rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1313
1314         IWL_DEBUG_RATE(mvm, "LQ: MIMO3 best rate %d mask %X\n",
1315                        rate, rate_mask);
1316         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1317                 IWL_DEBUG_RATE(mvm, "Can't switch with index %d rate mask %x\n",
1318                                rate, rate_mask);
1319                 return -1;
1320         }
1321         tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green);
1322
1323         IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n",
1324                        tbl->current_rate, is_green);
1325         return 0;
1326 }
1327
1328 /*
1329  * Set up search table for SISO
1330  */
1331 static int rs_switch_to_siso(struct iwl_mvm *mvm,
1332                              struct iwl_lq_sta *lq_sta,
1333                              struct ieee80211_sta *sta,
1334                              struct iwl_scale_tbl_info *tbl, int index)
1335 {
1336         u16 rate_mask;
1337         u8 is_green = lq_sta->is_green;
1338         s32 rate;
1339
1340         if (!sta->ht_cap.ht_supported)
1341                 return -1;
1342
1343         IWL_DEBUG_RATE(mvm, "LQ: try to switch to SISO\n");
1344
1345         tbl->lq_type = LQ_SISO;
1346         tbl->action = 0;
1347         tbl->max_search = IWL_MAX_SEARCH;
1348         rate_mask = lq_sta->active_siso_rate;
1349
1350         if (iwl_is_ht40_tx_allowed(sta))
1351                 tbl->is_ht40 = 1;
1352         else
1353                 tbl->is_ht40 = 0;
1354
1355         if (is_green)
1356                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1357
1358         rs_set_expected_tpt_table(lq_sta, tbl);
1359         rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1360
1361         IWL_DEBUG_RATE(mvm, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1362         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1363                 IWL_DEBUG_RATE(mvm,
1364                                "can not switch with index %d rate mask %x\n",
1365                                rate, rate_mask);
1366                 return -1;
1367         }
1368         tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green);
1369         IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n",
1370                        tbl->current_rate, is_green);
1371         return 0;
1372 }
1373
1374 /*
1375  * Try to switch to new modulation mode from legacy
1376  */
1377 static int rs_move_legacy_other(struct iwl_mvm *mvm,
1378                                 struct iwl_lq_sta *lq_sta,
1379                                 struct ieee80211_sta *sta,
1380                                 int index)
1381 {
1382         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1383         struct iwl_scale_tbl_info *search_tbl =
1384                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1385         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1386         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1387                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1388         u8 start_action;
1389         u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1390         u8 tx_chains_num = num_of_ant(valid_tx_ant);
1391         int ret;
1392         u8 update_search_tbl_counter = 0;
1393
1394         start_action = tbl->action;
1395         while (1) {
1396                 lq_sta->action_counter++;
1397                 switch (tbl->action) {
1398                 case IWL_LEGACY_SWITCH_ANTENNA1:
1399                 case IWL_LEGACY_SWITCH_ANTENNA2:
1400                         IWL_DEBUG_RATE(mvm, "LQ: Legacy toggle Antenna\n");
1401
1402                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1403                              tx_chains_num <= 1) ||
1404                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1405                              tx_chains_num <= 2))
1406                                 break;
1407
1408                         /* Don't change antenna if success has been great */
1409                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1410                                 break;
1411
1412                         /* Set up search table to try other antenna */
1413                         memcpy(search_tbl, tbl, sz);
1414
1415                         if (rs_toggle_antenna(valid_tx_ant,
1416                                               &search_tbl->current_rate,
1417                                               search_tbl)) {
1418                                 update_search_tbl_counter = 1;
1419                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1420                                 goto out;
1421                         }
1422                         break;
1423                 case IWL_LEGACY_SWITCH_SISO:
1424                         IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to SISO\n");
1425
1426                         /* Set up search table to try SISO */
1427                         memcpy(search_tbl, tbl, sz);
1428                         search_tbl->is_SGI = 0;
1429                         ret = rs_switch_to_siso(mvm, lq_sta, sta,
1430                                                  search_tbl, index);
1431                         if (!ret) {
1432                                 lq_sta->action_counter = 0;
1433                                 goto out;
1434                         }
1435
1436                         break;
1437                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1438                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1439                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1440                         IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO2\n");
1441
1442                         /* Set up search table to try MIMO */
1443                         memcpy(search_tbl, tbl, sz);
1444                         search_tbl->is_SGI = 0;
1445
1446                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1447                                 search_tbl->ant_type = ANT_AB;
1448                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1449                                 search_tbl->ant_type = ANT_AC;
1450                         else
1451                                 search_tbl->ant_type = ANT_BC;
1452
1453                         if (!rs_is_valid_ant(valid_tx_ant,
1454                                              search_tbl->ant_type))
1455                                 break;
1456
1457                         ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1458                                                  search_tbl, index);
1459                         if (!ret) {
1460                                 lq_sta->action_counter = 0;
1461                                 goto out;
1462                         }
1463                         break;
1464
1465                 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1466                         IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO3\n");
1467
1468                         /* Set up search table to try MIMO3 */
1469                         memcpy(search_tbl, tbl, sz);
1470                         search_tbl->is_SGI = 0;
1471
1472                         search_tbl->ant_type = ANT_ABC;
1473
1474                         if (!rs_is_valid_ant(valid_tx_ant,
1475                                              search_tbl->ant_type))
1476                                 break;
1477
1478                         ret = rs_switch_to_mimo3(mvm, lq_sta, sta,
1479                                                  search_tbl, index);
1480                         if (!ret) {
1481                                 lq_sta->action_counter = 0;
1482                                 goto out;
1483                         }
1484                         break;
1485                 }
1486                 tbl->action++;
1487                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1488                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1489
1490                 if (tbl->action == start_action)
1491                         break;
1492         }
1493         search_tbl->lq_type = LQ_NONE;
1494         return 0;
1495
1496 out:
1497         lq_sta->search_better_tbl = 1;
1498         tbl->action++;
1499         if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1500                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1501         if (update_search_tbl_counter)
1502                 search_tbl->action = tbl->action;
1503         return 0;
1504 }
1505
1506 /*
1507  * Try to switch to new modulation mode from SISO
1508  */
1509 static int rs_move_siso_to_other(struct iwl_mvm *mvm,
1510                                  struct iwl_lq_sta *lq_sta,
1511                                  struct ieee80211_sta *sta, int index)
1512 {
1513         u8 is_green = lq_sta->is_green;
1514         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1515         struct iwl_scale_tbl_info *search_tbl =
1516                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1517         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1518         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1519         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1520                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1521         u8 start_action;
1522         u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1523         u8 tx_chains_num = num_of_ant(valid_tx_ant);
1524         u8 update_search_tbl_counter = 0;
1525         int ret;
1526
1527         switch (BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD)) {
1528         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1529                 /* nothing */
1530                 break;
1531         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1532                 /* avoid antenna B unless MIMO */
1533                 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1534                         tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1535                 break;
1536         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1537         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1538                 /* avoid antenna B and MIMO */
1539                 valid_tx_ant =
1540                         first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
1541                 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1542                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1543                 break;
1544         default:
1545                 IWL_ERR(mvm, "Invalid BT load %d",
1546                         BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD));
1547                 break;
1548         }
1549
1550         start_action = tbl->action;
1551         while (1) {
1552                 lq_sta->action_counter++;
1553                 switch (tbl->action) {
1554                 case IWL_SISO_SWITCH_ANTENNA1:
1555                 case IWL_SISO_SWITCH_ANTENNA2:
1556                         IWL_DEBUG_RATE(mvm, "LQ: SISO toggle Antenna\n");
1557                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1558                              tx_chains_num <= 1) ||
1559                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1560                              tx_chains_num <= 2))
1561                                 break;
1562
1563                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1564                             BT_MBOX_MSG(&mvm->last_bt_notif, 3,
1565                                         TRAFFIC_LOAD) == 0)
1566                                 break;
1567
1568                         memcpy(search_tbl, tbl, sz);
1569                         if (rs_toggle_antenna(valid_tx_ant,
1570                                               &search_tbl->current_rate,
1571                                               search_tbl)) {
1572                                 update_search_tbl_counter = 1;
1573                                 goto out;
1574                         }
1575                         break;
1576                 case IWL_SISO_SWITCH_MIMO2_AB:
1577                 case IWL_SISO_SWITCH_MIMO2_AC:
1578                 case IWL_SISO_SWITCH_MIMO2_BC:
1579                         IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO2\n");
1580                         memcpy(search_tbl, tbl, sz);
1581                         search_tbl->is_SGI = 0;
1582
1583                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1584                                 search_tbl->ant_type = ANT_AB;
1585                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1586                                 search_tbl->ant_type = ANT_AC;
1587                         else
1588                                 search_tbl->ant_type = ANT_BC;
1589
1590                         if (!rs_is_valid_ant(valid_tx_ant,
1591                                              search_tbl->ant_type))
1592                                 break;
1593
1594                         ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1595                                                  search_tbl, index);
1596                         if (!ret)
1597                                 goto out;
1598                         break;
1599                 case IWL_SISO_SWITCH_GI:
1600                         if (!tbl->is_ht40 && !(ht_cap->cap &
1601                                                 IEEE80211_HT_CAP_SGI_20))
1602                                 break;
1603                         if (tbl->is_ht40 && !(ht_cap->cap &
1604                                                 IEEE80211_HT_CAP_SGI_40))
1605                                 break;
1606
1607                         IWL_DEBUG_RATE(mvm, "LQ: SISO toggle SGI/NGI\n");
1608
1609                         memcpy(search_tbl, tbl, sz);
1610                         if (is_green) {
1611                                 if (!tbl->is_SGI)
1612                                         break;
1613                                 else
1614                                         IWL_ERR(mvm,
1615                                                 "SGI was set in GF+SISO\n");
1616                         }
1617                         search_tbl->is_SGI = !tbl->is_SGI;
1618                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1619                         if (tbl->is_SGI) {
1620                                 s32 tpt = lq_sta->last_tpt / 100;
1621                                 if (tpt >= search_tbl->expected_tpt[index])
1622                                         break;
1623                         }
1624                         search_tbl->current_rate =
1625                                 rate_n_flags_from_tbl(mvm, search_tbl,
1626                                                       index, is_green);
1627                         update_search_tbl_counter = 1;
1628                         goto out;
1629                 case IWL_SISO_SWITCH_MIMO3_ABC:
1630                         IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO3\n");
1631                         memcpy(search_tbl, tbl, sz);
1632                         search_tbl->is_SGI = 0;
1633                         search_tbl->ant_type = ANT_ABC;
1634
1635                         if (!rs_is_valid_ant(valid_tx_ant,
1636                                              search_tbl->ant_type))
1637                                 break;
1638
1639                         ret = rs_switch_to_mimo3(mvm, lq_sta, sta,
1640                                                  search_tbl, index);
1641                         if (!ret)
1642                                 goto out;
1643                         break;
1644                 }
1645                 tbl->action++;
1646                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1647                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1648
1649                 if (tbl->action == start_action)
1650                         break;
1651         }
1652         search_tbl->lq_type = LQ_NONE;
1653         return 0;
1654
1655  out:
1656         lq_sta->search_better_tbl = 1;
1657         tbl->action++;
1658         if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1659                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1660         if (update_search_tbl_counter)
1661                 search_tbl->action = tbl->action;
1662
1663         return 0;
1664 }
1665
1666 /*
1667  * Try to switch to new modulation mode from MIMO2
1668  */
1669 static int rs_move_mimo2_to_other(struct iwl_mvm *mvm,
1670                                  struct iwl_lq_sta *lq_sta,
1671                                  struct ieee80211_sta *sta, int index)
1672 {
1673         s8 is_green = lq_sta->is_green;
1674         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1675         struct iwl_scale_tbl_info *search_tbl =
1676                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1677         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1678         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1679         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1680                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1681         u8 start_action;
1682         u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1683         u8 tx_chains_num = num_of_ant(valid_tx_ant);
1684         u8 update_search_tbl_counter = 0;
1685         int ret;
1686
1687         switch (BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD)) {
1688         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1689                 /* nothing */
1690                 break;
1691         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1692         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1693                 /* avoid antenna B and MIMO */
1694                 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1695                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1696                 break;
1697         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1698                 /* avoid antenna B unless MIMO */
1699                 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1700                     tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1701                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1702                 break;
1703         default:
1704                 IWL_ERR(mvm, "Invalid BT load %d",
1705                         BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD));
1706                 break;
1707         }
1708
1709         start_action = tbl->action;
1710         while (1) {
1711                 lq_sta->action_counter++;
1712                 switch (tbl->action) {
1713                 case IWL_MIMO2_SWITCH_ANTENNA1:
1714                 case IWL_MIMO2_SWITCH_ANTENNA2:
1715                         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle Antennas\n");
1716
1717                         if (tx_chains_num <= 2)
1718                                 break;
1719
1720                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1721                                 break;
1722
1723                         memcpy(search_tbl, tbl, sz);
1724                         if (rs_toggle_antenna(valid_tx_ant,
1725                                               &search_tbl->current_rate,
1726                                               search_tbl)) {
1727                                 update_search_tbl_counter = 1;
1728                                 goto out;
1729                         }
1730                         break;
1731                 case IWL_MIMO2_SWITCH_SISO_A:
1732                 case IWL_MIMO2_SWITCH_SISO_B:
1733                 case IWL_MIMO2_SWITCH_SISO_C:
1734                         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to SISO\n");
1735
1736                         /* Set up new search table for SISO */
1737                         memcpy(search_tbl, tbl, sz);
1738
1739                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1740                                 search_tbl->ant_type = ANT_A;
1741                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1742                                 search_tbl->ant_type = ANT_B;
1743                         else
1744                                 search_tbl->ant_type = ANT_C;
1745
1746                         if (!rs_is_valid_ant(valid_tx_ant,
1747                                              search_tbl->ant_type))
1748                                 break;
1749
1750                         ret = rs_switch_to_siso(mvm, lq_sta, sta,
1751                                                  search_tbl, index);
1752                         if (!ret)
1753                                 goto out;
1754
1755                         break;
1756
1757                 case IWL_MIMO2_SWITCH_GI:
1758                         if (!tbl->is_ht40 && !(ht_cap->cap &
1759                                                 IEEE80211_HT_CAP_SGI_20))
1760                                 break;
1761                         if (tbl->is_ht40 && !(ht_cap->cap &
1762                                                 IEEE80211_HT_CAP_SGI_40))
1763                                 break;
1764
1765                         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle SGI/NGI\n");
1766
1767                         /* Set up new search table for MIMO2 */
1768                         memcpy(search_tbl, tbl, sz);
1769                         search_tbl->is_SGI = !tbl->is_SGI;
1770                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1771                         /*
1772                          * If active table already uses the fastest possible
1773                          * modulation (dual stream with short guard interval),
1774                          * and it's working well, there's no need to look
1775                          * for a better type of modulation!
1776                          */
1777                         if (tbl->is_SGI) {
1778                                 s32 tpt = lq_sta->last_tpt / 100;
1779                                 if (tpt >= search_tbl->expected_tpt[index])
1780                                         break;
1781                         }
1782                         search_tbl->current_rate =
1783                                 rate_n_flags_from_tbl(mvm, search_tbl,
1784                                                       index, is_green);
1785                         update_search_tbl_counter = 1;
1786                         goto out;
1787
1788                 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1789                         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to MIMO3\n");
1790                         memcpy(search_tbl, tbl, sz);
1791                         search_tbl->is_SGI = 0;
1792                         search_tbl->ant_type = ANT_ABC;
1793
1794                         if (!rs_is_valid_ant(valid_tx_ant,
1795                                              search_tbl->ant_type))
1796                                 break;
1797
1798                         ret = rs_switch_to_mimo3(mvm, lq_sta, sta,
1799                                                  search_tbl, index);
1800                         if (!ret)
1801                                 goto out;
1802
1803                         break;
1804                 }
1805                 tbl->action++;
1806                 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1807                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1808
1809                 if (tbl->action == start_action)
1810                         break;
1811         }
1812         search_tbl->lq_type = LQ_NONE;
1813         return 0;
1814  out:
1815         lq_sta->search_better_tbl = 1;
1816         tbl->action++;
1817         if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1818                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1819         if (update_search_tbl_counter)
1820                 search_tbl->action = tbl->action;
1821
1822         return 0;
1823 }
1824
1825 /*
1826  * Try to switch to new modulation mode from MIMO3
1827  */
1828 static int rs_move_mimo3_to_other(struct iwl_mvm *mvm,
1829                                  struct iwl_lq_sta *lq_sta,
1830                                  struct ieee80211_sta *sta, int index)
1831 {
1832         s8 is_green = lq_sta->is_green;
1833         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1834         struct iwl_scale_tbl_info *search_tbl =
1835                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1836         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1837         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1838         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1839                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1840         u8 start_action;
1841         u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1842         u8 tx_chains_num = num_of_ant(valid_tx_ant);
1843         int ret;
1844         u8 update_search_tbl_counter = 0;
1845
1846         switch (BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD)) {
1847         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1848                 /* nothing */
1849                 break;
1850         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1851         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1852                 /* avoid antenna B and MIMO */
1853                 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1854                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1855                 break;
1856         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1857                 /* avoid antenna B unless MIMO */
1858                 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1859                     tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1860                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1861                 break;
1862         default:
1863                 IWL_ERR(mvm, "Invalid BT load %d",
1864                         BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD));
1865                 break;
1866         }
1867
1868         start_action = tbl->action;
1869         while (1) {
1870                 lq_sta->action_counter++;
1871                 switch (tbl->action) {
1872                 case IWL_MIMO3_SWITCH_ANTENNA1:
1873                 case IWL_MIMO3_SWITCH_ANTENNA2:
1874                         IWL_DEBUG_RATE(mvm, "LQ: MIMO3 toggle Antennas\n");
1875
1876                         if (tx_chains_num <= 3)
1877                                 break;
1878
1879                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1880                                 break;
1881
1882                         memcpy(search_tbl, tbl, sz);
1883                         if (rs_toggle_antenna(valid_tx_ant,
1884                                               &search_tbl->current_rate,
1885                                               search_tbl))
1886                                 goto out;
1887                         break;
1888                 case IWL_MIMO3_SWITCH_SISO_A:
1889                 case IWL_MIMO3_SWITCH_SISO_B:
1890                 case IWL_MIMO3_SWITCH_SISO_C:
1891                         IWL_DEBUG_RATE(mvm, "LQ: MIMO3 switch to SISO\n");
1892
1893                         /* Set up new search table for SISO */
1894                         memcpy(search_tbl, tbl, sz);
1895
1896                         if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1897                                 search_tbl->ant_type = ANT_A;
1898                         else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1899                                 search_tbl->ant_type = ANT_B;
1900                         else
1901                                 search_tbl->ant_type = ANT_C;
1902
1903                         if (!rs_is_valid_ant(valid_tx_ant,
1904                                              search_tbl->ant_type))
1905                                 break;
1906
1907                         ret = rs_switch_to_siso(mvm, lq_sta, sta,
1908                                                 search_tbl, index);
1909                         if (!ret)
1910                                 goto out;
1911
1912                         break;
1913
1914                 case IWL_MIMO3_SWITCH_MIMO2_AB:
1915                 case IWL_MIMO3_SWITCH_MIMO2_AC:
1916                 case IWL_MIMO3_SWITCH_MIMO2_BC:
1917                         IWL_DEBUG_RATE(mvm, "LQ: MIMO3 switch to MIMO2\n");
1918
1919                         memcpy(search_tbl, tbl, sz);
1920                         search_tbl->is_SGI = 0;
1921                         if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1922                                 search_tbl->ant_type = ANT_AB;
1923                         else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1924                                 search_tbl->ant_type = ANT_AC;
1925                         else
1926                                 search_tbl->ant_type = ANT_BC;
1927
1928                         if (!rs_is_valid_ant(valid_tx_ant,
1929                                              search_tbl->ant_type))
1930                                 break;
1931
1932                         ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1933                                                  search_tbl, index);
1934                         if (!ret)
1935                                 goto out;
1936
1937                         break;
1938
1939                 case IWL_MIMO3_SWITCH_GI:
1940                         if (!tbl->is_ht40 && !(ht_cap->cap &
1941                                                 IEEE80211_HT_CAP_SGI_20))
1942                                 break;
1943                         if (tbl->is_ht40 && !(ht_cap->cap &
1944                                                 IEEE80211_HT_CAP_SGI_40))
1945                                 break;
1946
1947                         IWL_DEBUG_RATE(mvm, "LQ: MIMO3 toggle SGI/NGI\n");
1948
1949                         /* Set up new search table for MIMO */
1950                         memcpy(search_tbl, tbl, sz);
1951                         search_tbl->is_SGI = !tbl->is_SGI;
1952                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1953                         /*
1954                          * If active table already uses the fastest possible
1955                          * modulation (dual stream with short guard interval),
1956                          * and it's working well, there's no need to look
1957                          * for a better type of modulation!
1958                          */
1959                         if (tbl->is_SGI) {
1960                                 s32 tpt = lq_sta->last_tpt / 100;
1961                                 if (tpt >= search_tbl->expected_tpt[index])
1962                                         break;
1963                         }
1964                         search_tbl->current_rate =
1965                                 rate_n_flags_from_tbl(mvm, search_tbl,
1966                                                       index, is_green);
1967                         update_search_tbl_counter = 1;
1968                         goto out;
1969                 }
1970                 tbl->action++;
1971                 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1972                         tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1973
1974                 if (tbl->action == start_action)
1975                         break;
1976         }
1977         search_tbl->lq_type = LQ_NONE;
1978         return 0;
1979  out:
1980         lq_sta->search_better_tbl = 1;
1981         tbl->action++;
1982         if (tbl->action > IWL_MIMO3_SWITCH_GI)
1983                 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1984         if (update_search_tbl_counter)
1985                 search_tbl->action = tbl->action;
1986
1987         return 0;
1988 }
1989
1990 /*
1991  * Check whether we should continue using same modulation mode, or
1992  * begin search for a new mode, based on:
1993  * 1) # tx successes or failures while using this mode
1994  * 2) # times calling this function
1995  * 3) elapsed time in this mode (not used, for now)
1996  */
1997 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1998 {
1999         struct iwl_scale_tbl_info *tbl;
2000         int i;
2001         int active_tbl;
2002         int flush_interval_passed = 0;
2003         struct iwl_mvm *mvm;
2004
2005         mvm = lq_sta->drv;
2006         active_tbl = lq_sta->active_tbl;
2007
2008         tbl = &(lq_sta->lq_info[active_tbl]);
2009
2010         /* If we've been disallowing search, see if we should now allow it */
2011         if (lq_sta->stay_in_tbl) {
2012                 /* Elapsed time using current modulation mode */
2013                 if (lq_sta->flush_timer)
2014                         flush_interval_passed =
2015                                 time_after(jiffies,
2016                                            (unsigned long)(lq_sta->flush_timer +
2017                                                 IWL_RATE_SCALE_FLUSH_INTVL));
2018
2019                 /*
2020                  * Check if we should allow search for new modulation mode.
2021                  * If many frames have failed or succeeded, or we've used
2022                  * this same modulation for a long time, allow search, and
2023                  * reset history stats that keep track of whether we should
2024                  * allow a new search.  Also (below) reset all bitmaps and
2025                  * stats in active history.
2026                  */
2027                 if (force_search ||
2028                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2029                     (lq_sta->total_success > lq_sta->max_success_limit) ||
2030                     ((!lq_sta->search_better_tbl) &&
2031                      (lq_sta->flush_timer) && (flush_interval_passed))) {
2032                         IWL_DEBUG_RATE(mvm,
2033                                        "LQ: stay is expired %d %d %d\n",
2034                                      lq_sta->total_failed,
2035                                      lq_sta->total_success,
2036                                      flush_interval_passed);
2037
2038                         /* Allow search for new mode */
2039                         lq_sta->stay_in_tbl = 0;        /* only place reset */
2040                         lq_sta->total_failed = 0;
2041                         lq_sta->total_success = 0;
2042                         lq_sta->flush_timer = 0;
2043                 /*
2044                  * Else if we've used this modulation mode enough repetitions
2045                  * (regardless of elapsed time or success/failure), reset
2046                  * history bitmaps and rate-specific stats for all rates in
2047                  * active table.
2048                  */
2049                 } else {
2050                         lq_sta->table_count++;
2051                         if (lq_sta->table_count >=
2052                             lq_sta->table_count_limit) {
2053                                 lq_sta->table_count = 0;
2054
2055                                 IWL_DEBUG_RATE(mvm,
2056                                                "LQ: stay in table clear win\n");
2057                                 for (i = 0; i < IWL_RATE_COUNT; i++)
2058                                         rs_rate_scale_clear_window(
2059                                                 &(tbl->win[i]));
2060                         }
2061                 }
2062
2063                 /* If transitioning to allow "search", reset all history
2064                  * bitmaps and stats in active table (this will become the new
2065                  * "search" table). */
2066                 if (!lq_sta->stay_in_tbl) {
2067                         for (i = 0; i < IWL_RATE_COUNT; i++)
2068                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2069                 }
2070         }
2071 }
2072
2073 /*
2074  * setup rate table in uCode
2075  */
2076 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
2077                                struct iwl_lq_sta *lq_sta,
2078                                struct iwl_scale_tbl_info *tbl,
2079                                int index, u8 is_green)
2080 {
2081         u32 rate;
2082
2083         /* Update uCode's rate table. */
2084         rate = rate_n_flags_from_tbl(mvm, tbl, index, is_green);
2085         rs_fill_link_cmd(mvm, lq_sta, rate);
2086         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
2087 }
2088
2089 /*
2090  * Do rate scaling and search for new modulation mode.
2091  */
2092 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2093                                   struct sk_buff *skb,
2094                                   struct ieee80211_sta *sta,
2095                                   struct iwl_lq_sta *lq_sta)
2096 {
2097         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2098         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2099         int low = IWL_RATE_INVALID;
2100         int high = IWL_RATE_INVALID;
2101         int index;
2102         int i;
2103         struct iwl_rate_scale_data *window = NULL;
2104         int current_tpt = IWL_INVALID_VALUE;
2105         int low_tpt = IWL_INVALID_VALUE;
2106         int high_tpt = IWL_INVALID_VALUE;
2107         u32 fail_count;
2108         s8 scale_action = 0;
2109         u16 rate_mask;
2110         u8 update_lq = 0;
2111         struct iwl_scale_tbl_info *tbl, *tbl1;
2112         u16 rate_scale_index_msk = 0;
2113         u8 is_green = 0;
2114         u8 active_tbl = 0;
2115         u8 done_search = 0;
2116         u16 high_low;
2117         s32 sr;
2118         u8 tid = IWL_MAX_TID_COUNT;
2119         struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
2120         struct iwl_mvm_tid_data *tid_data;
2121
2122         IWL_DEBUG_RATE(mvm, "rate scale calculate new rate for skb\n");
2123
2124         /* Send management frames and NO_ACK data using lowest rate. */
2125         /* TODO: this could probably be improved.. */
2126         if (!ieee80211_is_data(hdr->frame_control) ||
2127             info->flags & IEEE80211_TX_CTL_NO_ACK)
2128                 return;
2129
2130         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2131
2132         tid = rs_tl_add_packet(lq_sta, hdr);
2133         if ((tid != IWL_MAX_TID_COUNT) &&
2134             (lq_sta->tx_agg_tid_en & (1 << tid))) {
2135                 tid_data = &sta_priv->tid_data[tid];
2136                 if (tid_data->state == IWL_AGG_OFF)
2137                         lq_sta->is_agg = 0;
2138                 else
2139                         lq_sta->is_agg = 1;
2140         } else {
2141                 lq_sta->is_agg = 0;
2142         }
2143
2144         /*
2145          * Select rate-scale / modulation-mode table to work with in
2146          * the rest of this function:  "search" if searching for better
2147          * modulation mode, or "active" if doing rate scaling within a mode.
2148          */
2149         if (!lq_sta->search_better_tbl)
2150                 active_tbl = lq_sta->active_tbl;
2151         else
2152                 active_tbl = 1 - lq_sta->active_tbl;
2153
2154         tbl = &(lq_sta->lq_info[active_tbl]);
2155         if (is_legacy(tbl->lq_type))
2156                 lq_sta->is_green = 0;
2157         else
2158                 lq_sta->is_green = rs_use_green(sta);
2159         is_green = lq_sta->is_green;
2160
2161         /* current tx rate */
2162         index = lq_sta->last_txrate_idx;
2163
2164         IWL_DEBUG_RATE(mvm, "Rate scale index %d for type %d\n", index,
2165                        tbl->lq_type);
2166
2167         /* rates available for this association, and for modulation mode */
2168         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2169
2170         IWL_DEBUG_RATE(mvm, "mask 0x%04X\n", rate_mask);
2171
2172         /* mask with station rate restriction */
2173         if (is_legacy(tbl->lq_type)) {
2174                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2175                         /* supp_rates has no CCK bits in A mode */
2176                         rate_scale_index_msk = (u16) (rate_mask &
2177                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2178                 else
2179                         rate_scale_index_msk = (u16) (rate_mask &
2180                                                       lq_sta->supp_rates);
2181
2182         } else {
2183                 rate_scale_index_msk = rate_mask;
2184         }
2185
2186         if (!rate_scale_index_msk)
2187                 rate_scale_index_msk = rate_mask;
2188
2189         if (!((1 << index) & rate_scale_index_msk)) {
2190                 IWL_ERR(mvm, "Current Rate is not valid\n");
2191                 if (lq_sta->search_better_tbl) {
2192                         /* revert to active table if search table is not valid*/
2193                         tbl->lq_type = LQ_NONE;
2194                         lq_sta->search_better_tbl = 0;
2195                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2196                         /* get "active" rate info */
2197                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2198                         rs_update_rate_tbl(mvm, lq_sta, tbl, index, is_green);
2199                 }
2200                 return;
2201         }
2202
2203         /* Get expected throughput table and history window for current rate */
2204         if (!tbl->expected_tpt) {
2205                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2206                 return;
2207         }
2208
2209         /* force user max rate if set by user */
2210         if ((lq_sta->max_rate_idx != -1) &&
2211             (lq_sta->max_rate_idx < index)) {
2212                 index = lq_sta->max_rate_idx;
2213                 update_lq = 1;
2214                 window = &(tbl->win[index]);
2215                 goto lq_update;
2216         }
2217
2218         window = &(tbl->win[index]);
2219
2220         /*
2221          * If there is not enough history to calculate actual average
2222          * throughput, keep analyzing results of more tx frames, without
2223          * changing rate or mode (bypass most of the rest of this function).
2224          * Set up new rate table in uCode only if old rate is not supported
2225          * in current association (use new rate found above).
2226          */
2227         fail_count = window->counter - window->success_counter;
2228         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2229             (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2230                 IWL_DEBUG_RATE(mvm,
2231                                "LQ: still below TH. succ=%d total=%d for index %d\n",
2232                                window->success_counter, window->counter, index);
2233
2234                 /* Can't calculate this yet; not enough history */
2235                 window->average_tpt = IWL_INVALID_VALUE;
2236
2237                 /* Should we stay with this modulation mode,
2238                  * or search for a new one? */
2239                 rs_stay_in_table(lq_sta, false);
2240
2241                 goto out;
2242         }
2243         /* Else we have enough samples; calculate estimate of
2244          * actual average throughput */
2245         if (window->average_tpt != ((window->success_ratio *
2246                         tbl->expected_tpt[index] + 64) / 128)) {
2247                 IWL_ERR(mvm,
2248                         "expected_tpt should have been calculated by now\n");
2249                 window->average_tpt = ((window->success_ratio *
2250                                         tbl->expected_tpt[index] + 64) / 128);
2251         }
2252
2253         /* If we are searching for better modulation mode, check success. */
2254         if (lq_sta->search_better_tbl) {
2255                 /* If good success, continue using the "search" mode;
2256                  * no need to send new link quality command, since we're
2257                  * continuing to use the setup that we've been trying. */
2258                 if (window->average_tpt > lq_sta->last_tpt) {
2259                         IWL_DEBUG_RATE(mvm,
2260                                        "LQ: SWITCHING TO NEW TABLE suc=%d cur-tpt=%d old-tpt=%d\n",
2261                                        window->success_ratio,
2262                                        window->average_tpt,
2263                                        lq_sta->last_tpt);
2264
2265                         if (!is_legacy(tbl->lq_type))
2266                                 lq_sta->enable_counter = 1;
2267
2268                         /* Swap tables; "search" becomes "active" */
2269                         lq_sta->active_tbl = active_tbl;
2270                         current_tpt = window->average_tpt;
2271                 /* Else poor success; go back to mode in "active" table */
2272                 } else {
2273                         IWL_DEBUG_RATE(mvm,
2274                                        "LQ: GOING BACK TO THE OLD TABLE suc=%d cur-tpt=%d old-tpt=%d\n",
2275                                        window->success_ratio,
2276                                        window->average_tpt,
2277                                        lq_sta->last_tpt);
2278
2279                         /* Nullify "search" table */
2280                         tbl->lq_type = LQ_NONE;
2281
2282                         /* Revert to "active" table */
2283                         active_tbl = lq_sta->active_tbl;
2284                         tbl = &(lq_sta->lq_info[active_tbl]);
2285
2286                         /* Revert to "active" rate and throughput info */
2287                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2288                         current_tpt = lq_sta->last_tpt;
2289
2290                         /* Need to set up a new rate table in uCode */
2291                         update_lq = 1;
2292                 }
2293
2294                 /* Either way, we've made a decision; modulation mode
2295                  * search is done, allow rate adjustment next time. */
2296                 lq_sta->search_better_tbl = 0;
2297                 done_search = 1;        /* Don't switch modes below! */
2298                 goto lq_update;
2299         }
2300
2301         /* (Else) not in search of better modulation mode, try for better
2302          * starting rate, while staying in this mode. */
2303         high_low = rs_get_adjacent_rate(mvm, index, rate_scale_index_msk,
2304                                         tbl->lq_type);
2305         low = high_low & 0xff;
2306         high = (high_low >> 8) & 0xff;
2307
2308         /* If user set max rate, dont allow higher than user constrain */
2309         if ((lq_sta->max_rate_idx != -1) &&
2310             (lq_sta->max_rate_idx < high))
2311                 high = IWL_RATE_INVALID;
2312
2313         sr = window->success_ratio;
2314
2315         /* Collect measured throughputs for current and adjacent rates */
2316         current_tpt = window->average_tpt;
2317         if (low != IWL_RATE_INVALID)
2318                 low_tpt = tbl->win[low].average_tpt;
2319         if (high != IWL_RATE_INVALID)
2320                 high_tpt = tbl->win[high].average_tpt;
2321
2322         scale_action = 0;
2323
2324         /* Too many failures, decrease rate */
2325         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2326                 IWL_DEBUG_RATE(mvm,
2327                                "decrease rate because of low success_ratio\n");
2328                 scale_action = -1;
2329         /* No throughput measured yet for adjacent rates; try increase. */
2330         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2331                    (high_tpt == IWL_INVALID_VALUE)) {
2332                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2333                         scale_action = 1;
2334                 else if (low != IWL_RATE_INVALID)
2335                         scale_action = 0;
2336         }
2337
2338         /* Both adjacent throughputs are measured, but neither one has better
2339          * throughput; we're using the best rate, don't change it! */
2340         else if ((low_tpt != IWL_INVALID_VALUE) &&
2341                  (high_tpt != IWL_INVALID_VALUE) &&
2342                  (low_tpt < current_tpt) &&
2343                  (high_tpt < current_tpt))
2344                 scale_action = 0;
2345
2346         /* At least one adjacent rate's throughput is measured,
2347          * and may have better performance. */
2348         else {
2349                 /* Higher adjacent rate's throughput is measured */
2350                 if (high_tpt != IWL_INVALID_VALUE) {
2351                         /* Higher rate has better throughput */
2352                         if (high_tpt > current_tpt &&
2353                             sr >= IWL_RATE_INCREASE_TH) {
2354                                 scale_action = 1;
2355                         } else {
2356                                 scale_action = 0;
2357                         }
2358
2359                 /* Lower adjacent rate's throughput is measured */
2360                 } else if (low_tpt != IWL_INVALID_VALUE) {
2361                         /* Lower rate has better throughput */
2362                         if (low_tpt > current_tpt) {
2363                                 IWL_DEBUG_RATE(mvm,
2364                                                "decrease rate because of low tpt\n");
2365                                 scale_action = -1;
2366                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2367                                 scale_action = 1;
2368                         }
2369                 }
2370         }
2371
2372         /* Sanity check; asked for decrease, but success rate or throughput
2373          * has been good at old rate.  Don't change it. */
2374         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2375             ((sr > IWL_RATE_HIGH_TH) ||
2376              (current_tpt > (100 * tbl->expected_tpt[low]))))
2377                 scale_action = 0;
2378
2379         if ((BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD) >=
2380              IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2381              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2382                 if (lq_sta->last_bt_traffic >
2383                     BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD)) {
2384                         /*
2385                          * don't set scale_action, don't want to scale up if
2386                          * the rate scale doesn't otherwise think that is a
2387                          * good idea.
2388                          */
2389                 } else if (lq_sta->last_bt_traffic <=
2390                            BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD)) {
2391                         scale_action = -1;
2392                 }
2393         }
2394         lq_sta->last_bt_traffic =
2395                 BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD);
2396
2397         if ((BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD) >=
2398              IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2399              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2400                 /* search for a new modulation */
2401                 rs_stay_in_table(lq_sta, true);
2402                 goto lq_update;
2403         }
2404
2405         switch (scale_action) {
2406         case -1:
2407                 /* Decrease starting rate, update uCode's rate table */
2408                 if (low != IWL_RATE_INVALID) {
2409                         update_lq = 1;
2410                         index = low;
2411                 }
2412
2413                 break;
2414         case 1:
2415                 /* Increase starting rate, update uCode's rate table */
2416                 if (high != IWL_RATE_INVALID) {
2417                         update_lq = 1;
2418                         index = high;
2419                 }
2420
2421                 break;
2422         case 0:
2423                 /* No change */
2424         default:
2425                 break;
2426         }
2427
2428         IWL_DEBUG_RATE(mvm,
2429                        "choose rate scale index %d action %d low %d high %d type %d\n",
2430                        index, scale_action, low, high, tbl->lq_type);
2431
2432 lq_update:
2433         /* Replace uCode's rate table for the destination station. */
2434         if (update_lq)
2435                 rs_update_rate_tbl(mvm, lq_sta, tbl, index, is_green);
2436
2437         rs_stay_in_table(lq_sta, false);
2438
2439         /*
2440          * Search for new modulation mode if we're:
2441          * 1)  Not changing rates right now
2442          * 2)  Not just finishing up a search
2443          * 3)  Allowing a new search
2444          */
2445         if (!update_lq && !done_search &&
2446             !lq_sta->stay_in_tbl && window->counter) {
2447                 /* Save current throughput to compare with "search" throughput*/
2448                 lq_sta->last_tpt = current_tpt;
2449
2450                 /* Select a new "search" modulation mode to try.
2451                  * If one is found, set up the new "search" table. */
2452                 if (is_legacy(tbl->lq_type))
2453                         rs_move_legacy_other(mvm, lq_sta, sta, index);
2454                 else if (is_siso(tbl->lq_type))
2455                         rs_move_siso_to_other(mvm, lq_sta, sta, index);
2456                 else if (is_mimo2(tbl->lq_type))
2457                         rs_move_mimo2_to_other(mvm, lq_sta, sta, index);
2458                 else
2459                         rs_move_mimo3_to_other(mvm, lq_sta, sta, index);
2460
2461                 /* If new "search" mode was selected, set up in uCode table */
2462                 if (lq_sta->search_better_tbl) {
2463                         /* Access the "search" table, clear its history. */
2464                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2465                         for (i = 0; i < IWL_RATE_COUNT; i++)
2466                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2467
2468                         /* Use new "search" start rate */
2469                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2470
2471                         IWL_DEBUG_RATE(mvm,
2472                                        "Switch current  mcs: %X index: %d\n",
2473                                        tbl->current_rate, index);
2474                         rs_fill_link_cmd(mvm, lq_sta, tbl->current_rate);
2475                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
2476                 } else {
2477                         done_search = 1;
2478                 }
2479         }
2480
2481         if (done_search && !lq_sta->stay_in_tbl) {
2482                 /* If the "active" (non-search) mode was legacy,
2483                  * and we've tried switching antennas,
2484                  * but we haven't been able to try HT modes (not available),
2485                  * stay with best antenna legacy modulation for a while
2486                  * before next round of mode comparisons. */
2487                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2488                 if (is_legacy(tbl1->lq_type) && !sta->ht_cap.ht_supported &&
2489                     lq_sta->action_counter > tbl1->max_search) {
2490                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2491                         rs_set_stay_in_table(mvm, 1, lq_sta);
2492                 }
2493
2494                 /* If we're in an HT mode, and all 3 mode switch actions
2495                  * have been tried and compared, stay in this best modulation
2496                  * mode for a while before next round of mode comparisons. */
2497                 if (lq_sta->enable_counter &&
2498                     (lq_sta->action_counter >= tbl1->max_search)) {
2499                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2500                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2501                             (tid != IWL_MAX_TID_COUNT)) {
2502                                 tid_data = &sta_priv->tid_data[tid];
2503                                 if (tid_data->state == IWL_AGG_OFF) {
2504                                         IWL_DEBUG_RATE(mvm,
2505                                                        "try to aggregate tid %d\n",
2506                                                        tid);
2507                                         rs_tl_turn_on_agg(mvm, tid,
2508                                                           lq_sta, sta);
2509                                 }
2510                         }
2511                         rs_set_stay_in_table(mvm, 0, lq_sta);
2512                 }
2513         }
2514
2515 out:
2516         tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, index, is_green);
2517         lq_sta->last_txrate_idx = index;
2518 }
2519
2520 /**
2521  * rs_initialize_lq - Initialize a station's hardware rate table
2522  *
2523  * The uCode's station table contains a table of fallback rates
2524  * for automatic fallback during transmission.
2525  *
2526  * NOTE: This sets up a default set of values.  These will be replaced later
2527  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2528  *       rc80211_simple.
2529  *
2530  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2531  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2532  *       which requires station table entry to exist).
2533  */
2534 static void rs_initialize_lq(struct iwl_mvm *mvm,
2535                              struct ieee80211_sta *sta,
2536                              struct iwl_lq_sta *lq_sta,
2537                              enum ieee80211_band band)
2538 {
2539         struct iwl_scale_tbl_info *tbl;
2540         int rate_idx;
2541         int i;
2542         u32 rate;
2543         u8 use_green = rs_use_green(sta);
2544         u8 active_tbl = 0;
2545         u8 valid_tx_ant;
2546
2547         if (!sta || !lq_sta)
2548                 return;
2549
2550         i = lq_sta->last_txrate_idx;
2551
2552         valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2553
2554         if (!lq_sta->search_better_tbl)
2555                 active_tbl = lq_sta->active_tbl;
2556         else
2557                 active_tbl = 1 - lq_sta->active_tbl;
2558
2559         tbl = &(lq_sta->lq_info[active_tbl]);
2560
2561         if ((i < 0) || (i >= IWL_RATE_COUNT))
2562                 i = 0;
2563
2564         rate = iwl_rates[i].plcp;
2565         tbl->ant_type = first_antenna(valid_tx_ant);
2566         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2567
2568         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2569                 rate |= RATE_MCS_CCK_MSK;
2570
2571         rs_get_tbl_info_from_mcs(rate, band, tbl, &rate_idx);
2572         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2573                 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2574
2575         rate = rate_n_flags_from_tbl(mvm, tbl, rate_idx, use_green);
2576         tbl->current_rate = rate;
2577         rs_set_expected_tpt_table(lq_sta, tbl);
2578         rs_fill_link_cmd(NULL, lq_sta, rate);
2579         /* TODO restore station should remember the lq cmd */
2580         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_SYNC, true);
2581 }
2582
2583 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2584                         struct ieee80211_tx_rate_control *txrc)
2585 {
2586         struct sk_buff *skb = txrc->skb;
2587         struct ieee80211_supported_band *sband = txrc->sband;
2588         struct iwl_op_mode *op_mode __maybe_unused =
2589                         (struct iwl_op_mode *)mvm_r;
2590         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2591         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2592         struct iwl_lq_sta *lq_sta = mvm_sta;
2593         int rate_idx;
2594
2595         IWL_DEBUG_RATE_LIMIT(mvm, "rate scale calculate new rate for skb\n");
2596
2597         /* Get max rate if user set max rate */
2598         if (lq_sta) {
2599                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2600                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2601                     (lq_sta->max_rate_idx != -1))
2602                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2603                 if ((lq_sta->max_rate_idx < 0) ||
2604                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2605                         lq_sta->max_rate_idx = -1;
2606         }
2607
2608         /* Treat uninitialized rate scaling data same as non-existing. */
2609         if (lq_sta && !lq_sta->drv) {
2610                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2611                 mvm_sta = NULL;
2612         }
2613
2614         /* Send management frames and NO_ACK data using lowest rate. */
2615         if (rate_control_send_low(sta, mvm_sta, txrc))
2616                 return;
2617
2618         rate_idx  = lq_sta->last_txrate_idx;
2619
2620         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2621                 rate_idx -= IWL_FIRST_OFDM_RATE;
2622                 /* 6M and 9M shared same MCS index */
2623                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2624                 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2625                     IWL_RATE_MIMO3_6M_PLCP)
2626                         rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2627                 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2628                          IWL_RATE_MIMO2_6M_PLCP)
2629                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2630                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2631                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2632                         info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2633                 if (lq_sta->last_rate_n_flags & RATE_MCS_CHAN_WIDTH_40) /* TODO */
2634                         info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2635                 if (lq_sta->last_rate_n_flags & RATE_HT_MCS_GF_MSK)
2636                         info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2637         } else {
2638                 /* Check for invalid rates */
2639                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2640                     ((sband->band == IEEE80211_BAND_5GHZ) &&
2641                      (rate_idx < IWL_FIRST_OFDM_RATE)))
2642                         rate_idx = rate_lowest_index(sband, sta);
2643                 /* On valid 5 GHz rate, adjust index */
2644                 else if (sband->band == IEEE80211_BAND_5GHZ)
2645                         rate_idx -= IWL_FIRST_OFDM_RATE;
2646                 info->control.rates[0].flags = 0;
2647         }
2648         info->control.rates[0].idx = rate_idx;
2649         info->control.rates[0].count = 1;
2650 }
2651
2652 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2653                           gfp_t gfp)
2654 {
2655         struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2656         struct iwl_op_mode *op_mode __maybe_unused =
2657                         (struct iwl_op_mode *)mvm_rate;
2658         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2659
2660         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2661
2662         return &sta_priv->lq_sta;
2663 }
2664
2665 /*
2666  * Called after adding a new station to initialize rate scaling
2667  */
2668 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2669                           enum ieee80211_band band)
2670 {
2671         int i, j;
2672         struct ieee80211_hw *hw = mvm->hw;
2673         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2674         struct iwl_mvm_sta *sta_priv;
2675         struct iwl_lq_sta *lq_sta;
2676         struct ieee80211_supported_band *sband;
2677         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2678
2679         sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2680         lq_sta = &sta_priv->lq_sta;
2681         sband = hw->wiphy->bands[band];
2682
2683         lq_sta->lq.sta_id = sta_priv->sta_id;
2684
2685         for (j = 0; j < LQ_SIZE; j++)
2686                 for (i = 0; i < IWL_RATE_COUNT; i++)
2687                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2688
2689         lq_sta->flush_timer = 0;
2690         lq_sta->supp_rates = sta->supp_rates[sband->band];
2691         for (j = 0; j < LQ_SIZE; j++)
2692                 for (i = 0; i < IWL_RATE_COUNT; i++)
2693                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2694
2695         IWL_DEBUG_RATE(mvm,
2696                        "LQ: *** rate scale station global init for station %d ***\n",
2697                        sta_priv->sta_id);
2698         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2699          * the lowest or the highest rate.. Could consider using RSSI from
2700          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2701          * after assoc.. */
2702
2703         lq_sta->max_rate_idx = -1;
2704         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2705         lq_sta->is_green = rs_use_green(sta);
2706         lq_sta->band = sband->band;
2707         /*
2708          * active legacy rates as per supported rates bitmap
2709          */
2710         supp = sta->supp_rates[sband->band];
2711         lq_sta->active_legacy_rate = 0;
2712         for_each_set_bit(i, &supp, BITS_PER_LONG)
2713                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2714
2715         /*
2716          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2717          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2718          */
2719         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2720         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2721         lq_sta->active_siso_rate &= ~((u16)0x2);
2722         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2723
2724         /* Same here */
2725         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2726         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2727         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2728         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2729
2730         lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2731         lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2732         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2733         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2734
2735         IWL_DEBUG_RATE(mvm,
2736                        "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2737                        lq_sta->active_siso_rate,
2738                        lq_sta->active_mimo2_rate,
2739                        lq_sta->active_mimo3_rate);
2740
2741         /* These values will be overridden later */
2742         lq_sta->lq.single_stream_ant_msk =
2743                 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
2744         lq_sta->lq.dual_stream_ant_msk =
2745                 iwl_fw_valid_tx_ant(mvm->fw) &
2746                 ~first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
2747         if (!lq_sta->lq.dual_stream_ant_msk) {
2748                 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2749         } else if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) == 2) {
2750                 lq_sta->lq.dual_stream_ant_msk =
2751                         iwl_fw_valid_tx_ant(mvm->fw);
2752         }
2753
2754         /* as default allow aggregation for all tids */
2755         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2756         lq_sta->drv = mvm;
2757
2758         /* Set last_txrate_idx to lowest rate */
2759         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2760         if (sband->band == IEEE80211_BAND_5GHZ)
2761                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2762         lq_sta->is_agg = 0;
2763 #ifdef CONFIG_MAC80211_DEBUGFS
2764         lq_sta->dbg_fixed_rate = 0;
2765 #endif
2766
2767         rs_initialize_lq(mvm, sta, lq_sta, band);
2768 }
2769
2770 static void rs_fill_link_cmd(struct iwl_mvm *mvm,
2771                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2772 {
2773         struct iwl_scale_tbl_info tbl_type;
2774         int index = 0;
2775         int rate_idx;
2776         int repeat_rate = 0;
2777         u8 ant_toggle_cnt = 0;
2778         u8 use_ht_possible = 1;
2779         u8 valid_tx_ant = 0;
2780         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2781
2782         /* Override starting rate (index 0) if needed for debug purposes */
2783         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2784
2785         /* Interpret new_rate (rate_n_flags) */
2786         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2787                                  &tbl_type, &rate_idx);
2788
2789         /* How many times should we repeat the initial rate? */
2790         if (is_legacy(tbl_type.lq_type)) {
2791                 ant_toggle_cnt = 1;
2792                 repeat_rate = IWL_NUMBER_TRY;
2793         } else {
2794                 repeat_rate = min(IWL_HT_NUMBER_TRY,
2795                                   LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2796         }
2797
2798         lq_cmd->mimo_delim = is_mimo(tbl_type.lq_type) ? 1 : 0;
2799
2800         /* Fill 1st table entry (index 0) */
2801         lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2802
2803         if (num_of_ant(tbl_type.ant_type) == 1)
2804                 lq_cmd->single_stream_ant_msk = tbl_type.ant_type;
2805         else if (num_of_ant(tbl_type.ant_type) == 2)
2806                 lq_cmd->dual_stream_ant_msk = tbl_type.ant_type;
2807         /* otherwise we don't modify the existing value */
2808
2809         index++;
2810         repeat_rate--;
2811         if (mvm)
2812                 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2813
2814         /* Fill rest of rate table */
2815         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2816                 /* Repeat initial/next rate.
2817                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2818                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2819                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2820                         if (is_legacy(tbl_type.lq_type)) {
2821                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2822                                         ant_toggle_cnt++;
2823                                 else if (mvm &&
2824                                          rs_toggle_antenna(valid_tx_ant,
2825                                                         &new_rate, &tbl_type))
2826                                         ant_toggle_cnt = 1;
2827                         }
2828
2829                         /* Override next rate if needed for debug purposes */
2830                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2831
2832                         /* Fill next table entry */
2833                         lq_cmd->rs_table[index] =
2834                                         cpu_to_le32(new_rate);
2835                         repeat_rate--;
2836                         index++;
2837                 }
2838
2839                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2840                                          &rate_idx);
2841
2842
2843                 /* Indicate to uCode which entries might be MIMO.
2844                  * If initial rate was MIMO, this will finally end up
2845                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2846                 if (is_mimo(tbl_type.lq_type))
2847                         lq_cmd->mimo_delim = index;
2848
2849                 /* Get next rate */
2850                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2851                                              use_ht_possible);
2852
2853                 /* How many times should we repeat the next rate? */
2854                 if (is_legacy(tbl_type.lq_type)) {
2855                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2856                                 ant_toggle_cnt++;
2857                         else if (mvm &&
2858                                  rs_toggle_antenna(valid_tx_ant,
2859                                                    &new_rate, &tbl_type))
2860                                 ant_toggle_cnt = 1;
2861
2862                         repeat_rate = IWL_NUMBER_TRY;
2863                 } else {
2864                         repeat_rate = IWL_HT_NUMBER_TRY;
2865                 }
2866
2867                 /* Don't allow HT rates after next pass.
2868                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2869                 use_ht_possible = 0;
2870
2871                 /* Override next rate if needed for debug purposes */
2872                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2873
2874                 /* Fill next table entry */
2875                 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2876
2877                 index++;
2878                 repeat_rate--;
2879         }
2880
2881         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2882         lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2883
2884         lq_cmd->agg_time_limit =
2885                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2886
2887         /*
2888          * overwrite if needed, pass aggregation time limit
2889          * to uCode in uSec - This is racy - but heh, at least it helps...
2890          */
2891         if (mvm && BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD) >= 2)
2892                 lq_cmd->agg_time_limit = cpu_to_le16(1200);
2893 }
2894
2895 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2896 {
2897         return hw->priv;
2898 }
2899 /* rate scale requires free function to be implemented */
2900 static void rs_free(void *mvm_rate)
2901 {
2902         return;
2903 }
2904
2905 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2906                         void *mvm_sta)
2907 {
2908         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2909         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2910
2911         IWL_DEBUG_RATE(mvm, "enter\n");
2912         IWL_DEBUG_RATE(mvm, "leave\n");
2913 }
2914
2915 #ifdef CONFIG_MAC80211_DEBUGFS
2916 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2917                              u32 *rate_n_flags, int index)
2918 {
2919         struct iwl_mvm *mvm;
2920         u8 valid_tx_ant;
2921         u8 ant_sel_tx;
2922
2923         mvm = lq_sta->drv;
2924         valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2925         if (lq_sta->dbg_fixed_rate) {
2926                 ant_sel_tx =
2927                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2928                   >> RATE_MCS_ANT_POS);
2929                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2930                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2931                         IWL_DEBUG_RATE(mvm, "Fixed rate ON\n");
2932                 } else {
2933                         lq_sta->dbg_fixed_rate = 0;
2934                         IWL_ERR(mvm,
2935                                 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2936                                 ant_sel_tx, valid_tx_ant);
2937                         IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2938                 }
2939         } else {
2940                 IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2941         }
2942 }
2943
2944 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2945                         const char __user *user_buf, size_t count, loff_t *ppos)
2946 {
2947         struct iwl_lq_sta *lq_sta = file->private_data;
2948         struct iwl_mvm *mvm;
2949         char buf[64];
2950         size_t buf_size;
2951         u32 parsed_rate;
2952
2953
2954         mvm = lq_sta->drv;
2955         memset(buf, 0, sizeof(buf));
2956         buf_size = min(count, sizeof(buf) -  1);
2957         if (copy_from_user(buf, user_buf, buf_size))
2958                 return -EFAULT;
2959
2960         if (sscanf(buf, "%x", &parsed_rate) == 1)
2961                 lq_sta->dbg_fixed_rate = parsed_rate;
2962         else
2963                 lq_sta->dbg_fixed_rate = 0;
2964
2965         rs_program_fix_rate(mvm, lq_sta);
2966
2967         return count;
2968 }
2969
2970 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2971                         char __user *user_buf, size_t count, loff_t *ppos)
2972 {
2973         char *buff;
2974         int desc = 0;
2975         int i = 0;
2976         int index = 0;
2977         ssize_t ret;
2978
2979         struct iwl_lq_sta *lq_sta = file->private_data;
2980         struct iwl_mvm *mvm;
2981         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2982
2983         mvm = lq_sta->drv;
2984         buff = kmalloc(1024, GFP_KERNEL);
2985         if (!buff)
2986                 return -ENOMEM;
2987
2988         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2989         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2990                         lq_sta->total_failed, lq_sta->total_success,
2991                         lq_sta->active_legacy_rate);
2992         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2993                         lq_sta->dbg_fixed_rate);
2994         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2995             (iwl_fw_valid_tx_ant(mvm->fw) & ANT_A) ? "ANT_A," : "",
2996             (iwl_fw_valid_tx_ant(mvm->fw) & ANT_B) ? "ANT_B," : "",
2997             (iwl_fw_valid_tx_ant(mvm->fw) & ANT_C) ? "ANT_C" : "");
2998         desc += sprintf(buff+desc, "lq type %s\n",
2999            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3000         if (is_Ht(tbl->lq_type)) {
3001                 desc += sprintf(buff+desc, " %s",
3002                    (is_siso(tbl->lq_type)) ? "SISO" :
3003                    ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3004                    desc += sprintf(buff+desc, " %s",
3005                    (tbl->is_ht40) ? "40MHz" : "20MHz");
3006                    desc += sprintf(buff+desc, " %s %s %s\n",
3007                                    (tbl->is_SGI) ? "SGI" : "",
3008                    (lq_sta->is_green) ? "GF enabled" : "",
3009                    (lq_sta->is_agg) ? "AGG on" : "");
3010         }
3011         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3012                         lq_sta->last_rate_n_flags);
3013         desc += sprintf(buff+desc,
3014                         "general: flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3015                         lq_sta->lq.flags,
3016                         lq_sta->lq.mimo_delim,
3017                         lq_sta->lq.single_stream_ant_msk,
3018                         lq_sta->lq.dual_stream_ant_msk);
3019
3020         desc += sprintf(buff+desc,
3021                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3022                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3023                         lq_sta->lq.agg_disable_start_th,
3024                         lq_sta->lq.agg_frame_cnt_limit);
3025
3026         desc += sprintf(buff+desc,
3027                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3028                         lq_sta->lq.initial_rate_index[0],
3029                         lq_sta->lq.initial_rate_index[1],
3030                         lq_sta->lq.initial_rate_index[2],
3031                         lq_sta->lq.initial_rate_index[3]);
3032
3033         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3034                 index = iwl_hwrate_to_plcp_idx(
3035                         le32_to_cpu(lq_sta->lq.rs_table[i]));
3036                 if (is_legacy(tbl->lq_type)) {
3037                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3038                                         i, le32_to_cpu(lq_sta->lq.rs_table[i]),
3039                                         iwl_rate_mcs[index].mbps);
3040                 } else {
3041                         desc += sprintf(buff+desc,
3042                                         " rate[%d] 0x%X %smbps (%s)\n",
3043                                         i, le32_to_cpu(lq_sta->lq.rs_table[i]),
3044                                         iwl_rate_mcs[index].mbps,
3045                                         iwl_rate_mcs[index].mcs);
3046                 }
3047         }
3048
3049         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3050         kfree(buff);
3051         return ret;
3052 }
3053
3054 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3055         .write = rs_sta_dbgfs_scale_table_write,
3056         .read = rs_sta_dbgfs_scale_table_read,
3057         .open = simple_open,
3058         .llseek = default_llseek,
3059 };
3060 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3061                         char __user *user_buf, size_t count, loff_t *ppos)
3062 {
3063         char *buff;
3064         int desc = 0;
3065         int i, j;
3066         ssize_t ret;
3067
3068         struct iwl_lq_sta *lq_sta = file->private_data;
3069
3070         buff = kmalloc(1024, GFP_KERNEL);
3071         if (!buff)
3072                 return -ENOMEM;
3073
3074         for (i = 0; i < LQ_SIZE; i++) {
3075                 desc += sprintf(buff+desc,
3076                                 "%s type=%d SGI=%d HT40=%d DUP=0 GF=%d\n"
3077                                 "rate=0x%X\n",
3078                                 lq_sta->active_tbl == i ? "*" : "x",
3079                                 lq_sta->lq_info[i].lq_type,
3080                                 lq_sta->lq_info[i].is_SGI,
3081                                 lq_sta->lq_info[i].is_ht40,
3082                                 lq_sta->is_green,
3083                                 lq_sta->lq_info[i].current_rate);
3084                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3085                         desc += sprintf(buff+desc,
3086                                 "counter=%d success=%d %%=%d\n",
3087                                 lq_sta->lq_info[i].win[j].counter,
3088                                 lq_sta->lq_info[i].win[j].success_counter,
3089                                 lq_sta->lq_info[i].win[j].success_ratio);
3090                 }
3091         }
3092         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3093         kfree(buff);
3094         return ret;
3095 }
3096
3097 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3098         .read = rs_sta_dbgfs_stats_table_read,
3099         .open = simple_open,
3100         .llseek = default_llseek,
3101 };
3102
3103 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3104                         char __user *user_buf, size_t count, loff_t *ppos)
3105 {
3106         struct iwl_lq_sta *lq_sta = file->private_data;
3107         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3108         char buff[120];
3109         int desc = 0;
3110
3111         if (is_Ht(tbl->lq_type))
3112                 desc += sprintf(buff+desc,
3113                                 "Bit Rate= %d Mb/s\n",
3114                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3115         else
3116                 desc += sprintf(buff+desc,
3117                                 "Bit Rate= %d Mb/s\n",
3118                                 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3119
3120         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3121 }
3122
3123 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3124         .read = rs_sta_dbgfs_rate_scale_data_read,
3125         .open = simple_open,
3126         .llseek = default_llseek,
3127 };
3128
3129 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3130 {
3131         struct iwl_lq_sta *lq_sta = mvm_sta;
3132         lq_sta->rs_sta_dbgfs_scale_table_file =
3133                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3134                                     lq_sta, &rs_sta_dbgfs_scale_table_ops);
3135         lq_sta->rs_sta_dbgfs_stats_table_file =
3136                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3137                                     lq_sta, &rs_sta_dbgfs_stats_table_ops);
3138         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3139                 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3140                                     lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3141         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3142                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3143                                   &lq_sta->tx_agg_tid_en);
3144 }
3145
3146 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3147 {
3148         struct iwl_lq_sta *lq_sta = mvm_sta;
3149         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3150         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3151         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3152         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3153 }
3154 #endif
3155
3156 /*
3157  * Initialization of rate scaling information is done by driver after
3158  * the station is added. Since mac80211 calls this function before a
3159  * station is added we ignore it.
3160  */
3161 static void rs_rate_init_stub(void *mvm_r,
3162                                  struct ieee80211_supported_band *sband,
3163                                  struct ieee80211_sta *sta, void *mvm_sta)
3164 {
3165 }
3166 static struct rate_control_ops rs_mvm_ops = {
3167         .module = NULL,
3168         .name = RS_NAME,
3169         .tx_status = rs_tx_status,
3170         .get_rate = rs_get_rate,
3171         .rate_init = rs_rate_init_stub,
3172         .alloc = rs_alloc,
3173         .free = rs_free,
3174         .alloc_sta = rs_alloc_sta,
3175         .free_sta = rs_free_sta,
3176 #ifdef CONFIG_MAC80211_DEBUGFS
3177         .add_sta_debugfs = rs_add_debugfs,
3178         .remove_sta_debugfs = rs_remove_debugfs,
3179 #endif
3180 };
3181
3182 int iwl_mvm_rate_control_register(void)
3183 {
3184         return ieee80211_rate_control_register(&rs_mvm_ops);
3185 }
3186
3187 void iwl_mvm_rate_control_unregister(void)
3188 {
3189         ieee80211_rate_control_unregister(&rs_mvm_ops);
3190 }
3191
3192 /**
3193  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3194  * Tx protection, according to this rquest and previous requests,
3195  * and send the LQ command.
3196  * @lq: The LQ command
3197  * @mvmsta: The station
3198  * @enable: Enable Tx protection?
3199  */
3200 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_lq_cmd *lq,
3201                           struct iwl_mvm_sta *mvmsta, bool enable)
3202 {
3203         lockdep_assert_held(&mvm->mutex);
3204
3205         if (enable) {
3206                 if (mvmsta->tx_protection == 0)
3207                         lq->flags |= LQ_FLAG_SET_STA_TLC_RTS_MSK;
3208                 mvmsta->tx_protection++;
3209         } else {
3210                 mvmsta->tx_protection--;
3211                 if (mvmsta->tx_protection == 0)
3212                         lq->flags &= ~LQ_FLAG_SET_STA_TLC_RTS_MSK;
3213         }
3214
3215         return iwl_mvm_send_lq_cmd(mvm, lq, CMD_ASYNC, false);
3216 }