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         if ((iwlwifi_mod_params.auto_agg) || (load > IWL_AGG_LOAD_THRESHOLD)) {
 405                 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 406                              sta->addr, tid);
 407                 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 408                 if (ret == -EAGAIN) {
 409                         /*
 410                          * driver and mac80211 is out of sync
 411                          * this might be cause by reloading firmware
 412                          * stop the tx ba session here
 413                          */
 414                         IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 415                                 tid);
 416                         ieee80211_stop_tx_ba_session(sta, tid);
 417                 }
 418         } else {
 419                 IWL_DEBUG_HT(mvm,
 420                              "Aggregation not enabled for tid %d because load = %u\n",
 421                              tid, load);
 422         }
 423         return ret;
 424 }
 425
 426 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 427                               struct iwl_lq_sta *lq_data,
 428                               struct ieee80211_sta *sta)
 429 {
 430         if (tid < IWL_MAX_TID_COUNT)
 431                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 432         else
 433                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 434                         tid, IWL_MAX_TID_COUNT);
 435 }
 436
 437 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 438 {
 439         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 440                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 441                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 442 }
 443
 444 /*
 445  * Static function to get the expected throughput from an iwl_scale_tbl_info
 446  * that wraps a NULL pointer check
 447  */
 448 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 449 {
 450         if (tbl->expected_tpt)
 451                 return tbl->expected_tpt[rs_index];
 452         return 0;
 453 }
 454
 455 /**
 456  * rs_collect_tx_data - Update the success/failure sliding window
 457  *
 458  * We keep a sliding window of the last 62 packets transmitted
 459  * at this rate.  window->data contains the bitmask of successful
 460  * packets.
 461  */
 462 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 463                               int scale_index, int attempts, int successes)
 464 {
 465         struct iwl_rate_scale_data *window = NULL;
 466         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 467         s32 fail_count, tpt;
 468
 469         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 470                 return -EINVAL;
 471
 472         /* Select window for current tx bit rate */
 473         window = &(tbl->win[scale_index]);
 474
 475         /* Get expected throughput */
 476         tpt = get_expected_tpt(tbl, scale_index);
 477
 478         /*
 479          * Keep track of only the latest 62 tx frame attempts in this rate's
 480          * history window; anything older isn't really relevant any more.
 481          * If we have filled up the sliding window, drop the oldest attempt;
 482          * if the oldest attempt (highest bit in bitmap) shows "success",
 483          * subtract "1" from the success counter (this is the main reason
 484          * we keep these bitmaps!).
 485          */
 486         while (attempts > 0) {
 487                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 488                         /* remove earliest */
 489                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 490
 491                         if (window->data & mask) {
 492                                 window->data &= ~mask;
 493                                 window->success_counter--;
 494                         }
 495                 }
 496
 497                 /* Increment frames-attempted counter */
 498                 window->counter++;
 499
 500                 /* Shift bitmap by one frame to throw away oldest history */
 501                 window->data <<= 1;
 502
 503                 /* Mark the most recent #successes attempts as successful */
 504                 if (successes > 0) {
 505                         window->success_counter++;
 506                         window->data |= 0x1;
 507                         successes--;
 508                 }
 509
 510                 attempts--;
 511         }
 512
 513         /* Calculate current success ratio, avoid divide-by-0! */
 514         if (window->counter > 0)
 515                 window->success_ratio = 128 * (100 * window->success_counter)
 516                                         / window->counter;
 517         else
 518                 window->success_ratio = IWL_INVALID_VALUE;
 519
 520         fail_count = window->counter - window->success_counter;
 521
 522         /* Calculate average throughput, if we have enough history. */
 523         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 524             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 525                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 526         else
 527                 window->average_tpt = IWL_INVALID_VALUE;
 528
 529         /* Tag this window as having been updated */
 530         window->stamp = jiffies;
 531
 532         return 0;
 533 }
 534
 535 /*
 536  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 537  */
 538 /* FIXME:RS:remove this function and put the flags statically in the table */
 539 static u32 rate_n_flags_from_tbl(struct iwl_mvm *mvm,
 540                                  struct iwl_scale_tbl_info *tbl,
 541                                  int index, u8 use_green)
 542 {
 543         u32 rate_n_flags = 0;
 544
 545         if (is_legacy(tbl->lq_type)) {
 546                 rate_n_flags = iwl_rates[index].plcp;
 547                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 548                         rate_n_flags |= RATE_MCS_CCK_MSK;
 549         } else if (is_Ht(tbl->lq_type)) {
 550                 if (index > IWL_LAST_OFDM_RATE) {
 551                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 552                         index = IWL_LAST_OFDM_RATE;
 553                 }
 554                 rate_n_flags = RATE_MCS_HT_MSK;
 555
 556                 if (is_siso(tbl->lq_type))
 557                         rate_n_flags |= iwl_rates[index].plcp_siso;
 558                 else if (is_mimo2(tbl->lq_type))
 559                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 560                 else
 561                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 562         } else {
 563                 IWL_ERR(mvm, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 564         }
 565
 566         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 567                                                      RATE_MCS_ANT_ABC_MSK);
 568
 569         if (is_Ht(tbl->lq_type)) {
 570                 if (tbl->is_ht40)
 571                         rate_n_flags |= RATE_MCS_CHAN_WIDTH_40;
 572                 if (tbl->is_SGI)
 573                         rate_n_flags |= RATE_MCS_SGI_MSK;
 574
 575                 if (use_green) {
 576                         rate_n_flags |= RATE_HT_MCS_GF_MSK;
 577                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 578                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 579                                 IWL_ERR(mvm, "GF was set with SGI:SISO\n");
 580                         }
 581                 }
 582         }
 583         return rate_n_flags;
 584 }
 585
 586 /*
 587  * Interpret uCode API's rate_n_flags format,
 588  * fill "search" or "active" tx mode table.
 589  */
 590 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 591                                     enum ieee80211_band band,
 592                                     struct iwl_scale_tbl_info *tbl,
 593                                     int *rate_idx)
 594 {
 595         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 596         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 597         u8 mcs;
 598
 599         memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
 600         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 601
 602         if (*rate_idx  == IWL_RATE_INVALID) {
 603                 *rate_idx = -1;
 604                 return -EINVAL;
 605         }
 606         tbl->is_SGI = 0;        /* default legacy setup */
 607         tbl->is_ht40 = 0;
 608         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 609         tbl->lq_type = LQ_NONE;
 610         tbl->max_search = IWL_MAX_SEARCH;
 611
 612         /* legacy rate format */
 613         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 614                 if (num_of_ant == 1) {
 615                         if (band == IEEE80211_BAND_5GHZ)
 616                                 tbl->lq_type = LQ_A;
 617                         else
 618                                 tbl->lq_type = LQ_G;
 619                 }
 620         /* HT rate format */
 621         } else {
 622                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 623                         tbl->is_SGI = 1;
 624
 625                 if (rate_n_flags & RATE_MCS_CHAN_WIDTH_40) /* TODO */
 626                         tbl->is_ht40 = 1;
 627
 628                 mcs = rs_extract_rate(rate_n_flags);
 629
 630                 /* SISO */
 631                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 632                         if (num_of_ant == 1)
 633                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 634                 /* MIMO2 */
 635                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 636                         if (num_of_ant == 2)
 637                                 tbl->lq_type = LQ_MIMO2;
 638                 /* MIMO3 */
 639                 } else {
 640                         if (num_of_ant == 3) {
 641                                 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
 642                                 tbl->lq_type = LQ_MIMO3;
 643                         }
 644                 }
 645         }
 646         return 0;
 647 }
 648
 649 /* switch to another antenna/antennas and return 1 */
 650 /* if no other valid antenna found, return 0 */
 651 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 652                              struct iwl_scale_tbl_info *tbl)
 653 {
 654         u8 new_ant_type;
 655
 656         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 657                 return 0;
 658
 659         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 660                 return 0;
 661
 662         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 663
 664         while ((new_ant_type != tbl->ant_type) &&
 665                !rs_is_valid_ant(valid_ant, new_ant_type))
 666                 new_ant_type = ant_toggle_lookup[new_ant_type];
 667
 668         if (new_ant_type == tbl->ant_type)
 669                 return 0;
 670
 671         tbl->ant_type = new_ant_type;
 672         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 673         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 674         return 1;
 675 }
 676
 677 /**
 678  * Green-field mode is valid if the station supports it and
 679  * there are no non-GF stations present in the BSS.
 680  */
 681 static bool rs_use_green(struct ieee80211_sta *sta)
 682 {
 683         struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
 684
 685         bool use_green = !(sta_priv->vif->bss_conf.ht_operation_mode &
 686                                 IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
 687
 688         return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) && use_green;
 689 }
 690
 691 /**
 692  * rs_get_supported_rates - get the available rates
 693  *
 694  * if management frame or broadcast frame only return
 695  * basic available rates.
 696  *
 697  */
 698 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 699                                   struct ieee80211_hdr *hdr,
 700                                   enum iwl_table_type rate_type)
 701 {
 702         if (is_legacy(rate_type)) {
 703                 return lq_sta->active_legacy_rate;
 704         } else {
 705                 if (is_siso(rate_type))
 706                         return lq_sta->active_siso_rate;
 707                 else if (is_mimo2(rate_type))
 708                         return lq_sta->active_mimo2_rate;
 709                 else
 710                         return lq_sta->active_mimo3_rate;
 711         }
 712 }
 713
 714 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 715                                 int rate_type)
 716 {
 717         u8 high = IWL_RATE_INVALID;
 718         u8 low = IWL_RATE_INVALID;
 719
 720         /* 802.11A or ht walks to the next literal adjacent rate in
 721          * the rate table */
 722         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 723                 int i;
 724                 u32 mask;
 725
 726                 /* Find the previous rate that is in the rate mask */
 727                 i = index - 1;
 728                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 729                         if (rate_mask & mask) {
 730                                 low = i;
 731                                 break;
 732                         }
 733                 }
 734
 735                 /* Find the next rate that is in the rate mask */
 736                 i = index + 1;
 737                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 738                         if (rate_mask & mask) {
 739                                 high = i;
 740                                 break;
 741                         }
 742                 }
 743
 744                 return (high << 8) | low;
 745         }
 746
 747         low = index;
 748         while (low != IWL_RATE_INVALID) {
 749                 low = iwl_rates[low].prev_rs;
 750                 if (low == IWL_RATE_INVALID)
 751                         break;
 752                 if (rate_mask & (1 << low))
 753                         break;
 754                 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
 755         }
 756
 757         high = index;
 758         while (high != IWL_RATE_INVALID) {
 759                 high = iwl_rates[high].next_rs;
 760                 if (high == IWL_RATE_INVALID)
 761                         break;
 762                 if (rate_mask & (1 << high))
 763                         break;
 764                 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
 765         }
 766
 767         return (high << 8) | low;
 768 }
 769
 770 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 771                              struct iwl_scale_tbl_info *tbl,
 772                              u8 scale_index, u8 ht_possible)
 773 {
 774         s32 low;
 775         u16 rate_mask;
 776         u16 high_low;
 777         u8 switch_to_legacy = 0;
 778         u8 is_green = lq_sta->is_green;
 779         struct iwl_mvm *mvm = lq_sta->drv;
 780
 781         /* check if we need to switch from HT to legacy rates.
 782          * assumption is that mandatory rates (1Mbps or 6Mbps)
 783          * are always supported (spec demand) */
 784         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 785                 switch_to_legacy = 1;
 786                 scale_index = rs_ht_to_legacy[scale_index];
 787                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 788                         tbl->lq_type = LQ_A;
 789                 else
 790                         tbl->lq_type = LQ_G;
 791
 792                 if (num_of_ant(tbl->ant_type) > 1)
 793                         tbl->ant_type =
 794                             first_antenna(mvm->nvm_data->valid_tx_ant);
 795
 796                 tbl->is_ht40 = 0;
 797                 tbl->is_SGI = 0;
 798                 tbl->max_search = IWL_MAX_SEARCH;
 799         }
 800
 801         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 802
 803         /* Mask with station rate restriction */
 804         if (is_legacy(tbl->lq_type)) {
 805                 /* supp_rates has no CCK bits in A mode */
 806                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 807                         rate_mask  = (u16)(rate_mask &
 808                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 809                 else
 810                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 811         }
 812
 813         /* If we switched from HT to legacy, check current rate */
 814         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 815                 low = scale_index;
 816                 goto out;
 817         }
 818
 819         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 820                                         tbl->lq_type);
 821         low = high_low & 0xff;
 822
 823         if (low == IWL_RATE_INVALID)
 824                 low = scale_index;
 825
 826 out:
 827         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 828 }
 829
 830 /*
 831  * Simple function to compare two rate scale table types
 832  */
 833 static bool table_type_matches(struct iwl_scale_tbl_info *a,
 834                                struct iwl_scale_tbl_info *b)
 835 {
 836         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 837                 (a->is_SGI == b->is_SGI);
 838 }
 839
 840 /*
 841  * mac80211 sends us Tx status
 842  */
 843 static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
 844                          struct ieee80211_sta *sta, void *priv_sta,
 845                          struct sk_buff *skb)
 846 {
 847         int legacy_success;
 848         int retries;
 849         int rs_index, mac_index, i;
 850         struct iwl_lq_sta *lq_sta = priv_sta;
 851         struct iwl_lq_cmd *table;
 852         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 853         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
 854         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 855         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 856         enum mac80211_rate_control_flags mac_flags;
 857         u32 tx_rate;
 858         struct iwl_scale_tbl_info tbl_type;
 859         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 860
 861         IWL_DEBUG_RATE_LIMIT(mvm,
 862                              "get frame ack response, update rate scale window\n");
 863
 864         /* Treat uninitialized rate scaling data same as non-existing. */
 865         if (!lq_sta) {
 866                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
 867                 return;
 868         } else if (!lq_sta->drv) {
 869                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
 870                 return;
 871         }
 872
 873         if (!ieee80211_is_data(hdr->frame_control) ||
 874             info->flags & IEEE80211_TX_CTL_NO_ACK)
 875                 return;
 876
 877         /* This packet was aggregated but doesn't carry status info */
 878         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 879             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 880                 return;
 881
 882         /*
 883          * Ignore this Tx frame response if its initial rate doesn't match
 884          * that of latest Link Quality command.  There may be stragglers
 885          * from a previous Link Quality command, but we're no longer interested
 886          * in those; they're either from the "active" mode while we're trying
 887          * to check "search" mode, or a prior "search" mode after we've moved
 888          * to a new "search" mode (which might become the new "active" mode).
 889          */
 890         table = &lq_sta->lq;
 891         tx_rate = le32_to_cpu(table->rs_table[0]);
 892         rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type, &rs_index);
 893         if (info->band == IEEE80211_BAND_5GHZ)
 894                 rs_index -= IWL_FIRST_OFDM_RATE;
 895         mac_flags = info->status.rates[0].flags;
 896         mac_index = info->status.rates[0].idx;
 897         /* For HT packets, map MCS to PLCP */
 898         if (mac_flags & IEEE80211_TX_RC_MCS) {
 899                 /* Remove # of streams */
 900                 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
 901                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 902                         mac_index++;
 903                 /*
 904                  * mac80211 HT index is always zero-indexed; we need to move
 905                  * HT OFDM rates after CCK rates in 2.4 GHz band
 906                  */
 907                 if (info->band == IEEE80211_BAND_2GHZ)
 908                         mac_index += IWL_FIRST_OFDM_RATE;
 909         }
 910         /* Here we actually compare this rate to the latest LQ command */
 911         if ((mac_index < 0) ||
 912             (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 913             (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 914             (tbl_type.ant_type != info->status.antenna) ||
 915             (!!(tx_rate & RATE_MCS_HT_MSK) !=
 916                                 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 917             (!!(tx_rate & RATE_HT_MCS_GF_MSK) !=
 918                                 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 919             (rs_index != mac_index)) {
 920                 IWL_DEBUG_RATE(mvm,
 921                                "initial rate %d does not match %d (0x%x)\n",
 922                                mac_index, rs_index, tx_rate);
 923                 /*
 924                  * Since rates mis-match, the last LQ command may have failed.
 925                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 926                  * ... driver.
 927                  */
 928                 lq_sta->missed_rate_counter++;
 929                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 930                         lq_sta->missed_rate_counter = 0;
 931                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
 932                 }
 933                 /* Regardless, ignore this status info for outdated rate */
 934                 return;
 935         } else
 936                 /* Rate did match, so reset the missed_rate_counter */
 937                 lq_sta->missed_rate_counter = 0;
 938
 939         /* Figure out if rate scale algorithm is in active or search table */
 940         if (table_type_matches(&tbl_type,
 941                                &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 942                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 943                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 944         } else if (table_type_matches(
 945                         &tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
 946                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 947                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 948         } else {
 949                 IWL_DEBUG_RATE(mvm,
 950                                "Neither active nor search matches tx rate\n");
 951                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 952                 IWL_DEBUG_RATE(mvm, "active- lq:%x, ant:%x, SGI:%d\n",
 953                                tmp_tbl->lq_type, tmp_tbl->ant_type,
 954                                tmp_tbl->is_SGI);
 955                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 956                 IWL_DEBUG_RATE(mvm, "search- lq:%x, ant:%x, SGI:%d\n",
 957                                tmp_tbl->lq_type, tmp_tbl->ant_type,
 958                                tmp_tbl->is_SGI);
 959                 IWL_DEBUG_RATE(mvm, "actual- lq:%x, ant:%x, SGI:%d\n",
 960                                tbl_type.lq_type, tbl_type.ant_type,
 961                                tbl_type.is_SGI);
 962                 /*
 963                  * no matching table found, let's by-pass the data collection
 964                  * and continue to perform rate scale to find the rate table
 965                  */
 966                 rs_stay_in_table(lq_sta, true);
 967                 goto done;
 968         }
 969
 970         /*
 971          * Updating the frame history depends on whether packets were
 972          * aggregated.
 973          *
 974          * For aggregation, all packets were transmitted at the same rate, the
 975          * first index into rate scale table.
 976          */
 977         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
 978                 tx_rate = le32_to_cpu(table->rs_table[0]);
 979                 rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type,
 980                                          &rs_index);
 981                 rs_collect_tx_data(curr_tbl, rs_index,
 982                                    info->status.ampdu_len,
 983                                    info->status.ampdu_ack_len);
 984
 985                 /* Update success/fail counts if not searching for new mode */
 986                 if (lq_sta->stay_in_tbl) {
 987                         lq_sta->total_success += info->status.ampdu_ack_len;
 988                         lq_sta->total_failed += (info->status.ampdu_len -
 989                                         info->status.ampdu_ack_len);
 990                 }
 991         } else {
 992         /*
 993          * For legacy, update frame history with for each Tx retry.
 994          */
 995                 retries = info->status.rates[0].count - 1;
 996                 /* HW doesn't send more than 15 retries */
 997                 retries = min(retries, 15);
 998
 999                 /* The last transmission may have been successful */
1000                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1001                 /* Collect data for each rate used during failed TX attempts */
1002                 for (i = 0; i <= retries; ++i) {
1003                         tx_rate = le32_to_cpu(table->rs_table[i]);
1004                         rs_get_tbl_info_from_mcs(tx_rate, info->band,
1005                                                  &tbl_type, &rs_index);
1006                         /*
1007                          * Only collect stats if retried rate is in the same RS
1008                          * table as active/search.
1009                          */
1010                         if (table_type_matches(&tbl_type, curr_tbl))
1011                                 tmp_tbl = curr_tbl;
1012                         else if (table_type_matches(&tbl_type, other_tbl))
1013                                 tmp_tbl = other_tbl;
1014                         else
1015                                 continue;
1016                         rs_collect_tx_data(tmp_tbl, rs_index, 1,
1017                                            i < retries ? 0 : legacy_success);
1018                 }
1019
1020                 /* Update success/fail counts if not searching for new mode */
1021                 if (lq_sta->stay_in_tbl) {
1022                         lq_sta->total_success += legacy_success;
1023                         lq_sta->total_failed += retries + (1 - legacy_success);
1024                 }
1025         }
1026         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1027         lq_sta->last_rate_n_flags = tx_rate;
1028 done:
1029         /* See if there's a better rate or modulation mode to try. */
1030         if (sta && sta->supp_rates[sband->band])
1031                 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
1032 }
1033
1034 /*
1035  * Begin a period of staying with a selected modulation mode.
1036  * Set "stay_in_tbl" flag to prevent any mode switches.
1037  * Set frame tx success limits according to legacy vs. high-throughput,
1038  * and reset overall (spanning all rates) tx success history statistics.
1039  * These control how long we stay using same modulation mode before
1040  * searching for a new mode.
1041  */
1042 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1043                                  struct iwl_lq_sta *lq_sta)
1044 {
1045         IWL_DEBUG_RATE(mvm, "we are staying in the same table\n");
1046         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1047         if (is_legacy) {
1048                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1049                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1050                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1051         } else {
1052                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1053                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1054                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1055         }
1056         lq_sta->table_count = 0;
1057         lq_sta->total_failed = 0;
1058         lq_sta->total_success = 0;
1059         lq_sta->flush_timer = jiffies;
1060         lq_sta->action_counter = 0;
1061 }
1062
1063 /*
1064  * Find correct throughput table for given mode of modulation
1065  */
1066 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1067                                       struct iwl_scale_tbl_info *tbl)
1068 {
1069         /* Used to choose among HT tables */
1070         s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1071
1072         /* Check for invalid LQ type */
1073         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1074                 tbl->expected_tpt = expected_tpt_legacy;
1075                 return;
1076         }
1077
1078         /* Legacy rates have only one table */
1079         if (is_legacy(tbl->lq_type)) {
1080                 tbl->expected_tpt = expected_tpt_legacy;
1081                 return;
1082         }
1083
1084         /* Choose among many HT tables depending on number of streams
1085          * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1086          * status */
1087         if (is_siso(tbl->lq_type) && !tbl->is_ht40)
1088                 ht_tbl_pointer = expected_tpt_siso20MHz;
1089         else if (is_siso(tbl->lq_type))
1090                 ht_tbl_pointer = expected_tpt_siso40MHz;
1091         else if (is_mimo2(tbl->lq_type) && !tbl->is_ht40)
1092                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1093         else if (is_mimo2(tbl->lq_type))
1094                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1095         else if (is_mimo3(tbl->lq_type) && !tbl->is_ht40)
1096                 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1097         else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1098                 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1099
1100         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
1101                 tbl->expected_tpt = ht_tbl_pointer[0];
1102         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1103                 tbl->expected_tpt = ht_tbl_pointer[1];
1104         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1105                 tbl->expected_tpt = ht_tbl_pointer[2];
1106         else                                            /* AGG+SGI */
1107                 tbl->expected_tpt = ht_tbl_pointer[3];
1108 }
1109
1110 /*
1111  * Find starting rate for new "search" high-throughput mode of modulation.
1112  * Goal is to find lowest expected rate (under perfect conditions) that is
1113  * above the current measured throughput of "active" mode, to give new mode
1114  * a fair chance to prove itself without too many challenges.
1115  *
1116  * This gets called when transitioning to more aggressive modulation
1117  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1118  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1119  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1120  * bit rate will typically need to increase, but not if performance was bad.
1121  */
1122 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1123                             struct iwl_lq_sta *lq_sta,
1124                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1125                             u16 rate_mask, s8 index)
1126 {
1127         /* "active" values */
1128         struct iwl_scale_tbl_info *active_tbl =
1129             &(lq_sta->lq_info[lq_sta->active_tbl]);
1130         s32 active_sr = active_tbl->win[index].success_ratio;
1131         s32 active_tpt = active_tbl->expected_tpt[index];
1132
1133         /* expected "search" throughput */
1134         s32 *tpt_tbl = tbl->expected_tpt;
1135
1136         s32 new_rate, high, low, start_hi;
1137         u16 high_low;
1138         s8 rate = index;
1139
1140         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1141
1142         while (1) {
1143                 high_low = rs_get_adjacent_rate(mvm, rate, rate_mask,
1144                                                 tbl->lq_type);
1145
1146                 low = high_low & 0xff;
1147                 high = (high_low >> 8) & 0xff;
1148
1149                 /*
1150                  * Lower the "search" bit rate, to give new "search" mode
1151                  * approximately the same throughput as "active" if:
1152                  *
1153                  * 1) "Active" mode has been working modestly well (but not
1154                  *    great), and expected "search" throughput (under perfect
1155                  *    conditions) at candidate rate is above the actual
1156                  *    measured "active" throughput (but less than expected
1157                  *    "active" throughput under perfect conditions).
1158                  * OR
1159                  * 2) "Active" mode has been working perfectly or very well
1160                  *    and expected "search" throughput (under perfect
1161                  *    conditions) at candidate rate is above expected
1162                  *    "active" throughput (under perfect conditions).
1163                  */
1164                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1165                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1166                       (active_sr <= IWL_RATE_HIGH_TH) &&
1167                       (tpt_tbl[rate] <= active_tpt))) ||
1168                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1169                      (tpt_tbl[rate] > active_tpt))) {
1170                         /* (2nd or later pass)
1171                          * If we've already tried to raise the rate, and are
1172                          * now trying to lower it, use the higher rate. */
1173                         if (start_hi != IWL_RATE_INVALID) {
1174                                 new_rate = start_hi;
1175                                 break;
1176                         }
1177
1178                         new_rate = rate;
1179
1180                         /* Loop again with lower rate */
1181                         if (low != IWL_RATE_INVALID)
1182                                 rate = low;
1183
1184                         /* Lower rate not available, use the original */
1185                         else
1186                                 break;
1187
1188                 /* Else try to raise the "search" rate to match "active" */
1189                 } else {
1190                         /* (2nd or later pass)
1191                          * If we've already tried to lower the rate, and are
1192                          * now trying to raise it, use the lower rate. */
1193                         if (new_rate != IWL_RATE_INVALID)
1194                                 break;
1195
1196                         /* Loop again with higher rate */
1197                         else if (high != IWL_RATE_INVALID) {
1198                                 start_hi = high;
1199                                 rate = high;
1200
1201                         /* Higher rate not available, use the original */
1202                         } else {
1203                                 new_rate = rate;
1204                                 break;
1205                         }
1206                 }
1207         }
1208
1209         return new_rate;
1210 }
1211
1212 static bool iwl_is_ht40_tx_allowed(struct ieee80211_sta *sta)
1213 {
1214         return sta->bandwidth >= IEEE80211_STA_RX_BW_40;
1215 }
1216
1217 /*
1218  * Set up search table for MIMO2
1219  */
1220 static int rs_switch_to_mimo2(struct iwl_mvm *mvm,
1221                              struct iwl_lq_sta *lq_sta,
1222                              struct ieee80211_sta *sta,
1223                              struct iwl_scale_tbl_info *tbl, int index)
1224 {
1225         u16 rate_mask;
1226         s32 rate;
1227         s8 is_green = lq_sta->is_green;
1228
1229         if (!sta->ht_cap.ht_supported)
1230                 return -1;
1231
1232         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1233                 return -1;
1234
1235         /* Need both Tx chains/antennas to support MIMO */
1236         if (num_of_ant(mvm->nvm_data->valid_tx_ant) < 2)
1237                 return -1;
1238
1239         IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO2\n");
1240
1241         tbl->lq_type = LQ_MIMO2;
1242         tbl->action = 0;
1243         tbl->max_search = IWL_MAX_SEARCH;
1244         rate_mask = lq_sta->active_mimo2_rate;
1245
1246         if (iwl_is_ht40_tx_allowed(sta))
1247                 tbl->is_ht40 = 1;
1248         else
1249                 tbl->is_ht40 = 0;
1250
1251         rs_set_expected_tpt_table(lq_sta, tbl);
1252
1253         rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1254
1255         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 best rate %d mask %X\n",
1256                        rate, rate_mask);
1257         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1258                 IWL_DEBUG_RATE(mvm, "Can't switch with index %d rate mask %x\n",
1259                                rate, rate_mask);
1260                 return -1;
1261         }
1262         tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green);
1263
1264         IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n",
1265                        tbl->current_rate, is_green);
1266         return 0;
1267 }
1268
1269 /*
1270  * Set up search table for MIMO3
1271  */
1272 static int rs_switch_to_mimo3(struct iwl_mvm *mvm,
1273                              struct iwl_lq_sta *lq_sta,
1274                              struct ieee80211_sta *sta,
1275                              struct iwl_scale_tbl_info *tbl, int index)
1276 {
1277         u16 rate_mask;
1278         s32 rate;
1279         s8 is_green = lq_sta->is_green;
1280
1281         if (!sta->ht_cap.ht_supported)
1282                 return -1;
1283
1284         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1285                 return -1;
1286
1287         /* Need both Tx chains/antennas to support MIMO */
1288         if (num_of_ant(mvm->nvm_data->valid_tx_ant) < 3)
1289                 return -1;
1290
1291         IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO3\n");
1292
1293         tbl->lq_type = LQ_MIMO3;
1294         tbl->action = 0;
1295         tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1296         rate_mask = lq_sta->active_mimo3_rate;
1297
1298         if (iwl_is_ht40_tx_allowed(sta))
1299                 tbl->is_ht40 = 1;
1300         else
1301                 tbl->is_ht40 = 0;
1302
1303         rs_set_expected_tpt_table(lq_sta, tbl);
1304
1305         rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1306
1307         IWL_DEBUG_RATE(mvm, "LQ: MIMO3 best rate %d mask %X\n",
1308                        rate, rate_mask);
1309         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1310                 IWL_DEBUG_RATE(mvm, "Can't switch with index %d rate mask %x\n",
1311                                rate, rate_mask);
1312                 return -1;
1313         }
1314         tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green);
1315
1316         IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n",
1317                        tbl->current_rate, is_green);
1318         return 0;
1319 }
1320
1321 /*
1322  * Set up search table for SISO
1323  */
1324 static int rs_switch_to_siso(struct iwl_mvm *mvm,
1325                              struct iwl_lq_sta *lq_sta,
1326                              struct ieee80211_sta *sta,
1327                              struct iwl_scale_tbl_info *tbl, int index)
1328 {
1329         u16 rate_mask;
1330         u8 is_green = lq_sta->is_green;
1331         s32 rate;
1332
1333         if (!sta->ht_cap.ht_supported)
1334                 return -1;
1335
1336         IWL_DEBUG_RATE(mvm, "LQ: try to switch to SISO\n");
1337
1338         tbl->lq_type = LQ_SISO;
1339         tbl->action = 0;
1340         tbl->max_search = IWL_MAX_SEARCH;
1341         rate_mask = lq_sta->active_siso_rate;
1342
1343         if (iwl_is_ht40_tx_allowed(sta))
1344                 tbl->is_ht40 = 1;
1345         else
1346                 tbl->is_ht40 = 0;
1347
1348         if (is_green)
1349                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1350
1351         rs_set_expected_tpt_table(lq_sta, tbl);
1352         rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1353
1354         IWL_DEBUG_RATE(mvm, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1355         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1356                 IWL_DEBUG_RATE(mvm,
1357                                "can not switch with index %d rate mask %x\n",
1358                                rate, rate_mask);
1359                 return -1;
1360         }
1361         tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green);
1362         IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n",
1363                        tbl->current_rate, is_green);
1364         return 0;
1365 }
1366
1367 /*
1368  * Try to switch to new modulation mode from legacy
1369  */
1370 static int rs_move_legacy_other(struct iwl_mvm *mvm,
1371                                 struct iwl_lq_sta *lq_sta,
1372                                 struct ieee80211_sta *sta,
1373                                 int index)
1374 {
1375         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1376         struct iwl_scale_tbl_info *search_tbl =
1377                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1378         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1379         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1380                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1381         u8 start_action;
1382         u8 valid_tx_ant = mvm->nvm_data->valid_tx_ant;
1383         u8 tx_chains_num = num_of_ant(valid_tx_ant);
1384         int ret;
1385         u8 update_search_tbl_counter = 0;
1386
1387         start_action = tbl->action;
1388         while (1) {
1389                 lq_sta->action_counter++;
1390                 switch (tbl->action) {
1391                 case IWL_LEGACY_SWITCH_ANTENNA1:
1392                 case IWL_LEGACY_SWITCH_ANTENNA2:
1393                         IWL_DEBUG_RATE(mvm, "LQ: Legacy toggle Antenna\n");
1394
1395                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1396                              tx_chains_num <= 1) ||
1397                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1398                              tx_chains_num <= 2))
1399                                 break;
1400
1401                         /* Don't change antenna if success has been great */
1402                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1403                                 break;
1404
1405                         /* Set up search table to try other antenna */
1406                         memcpy(search_tbl, tbl, sz);
1407
1408                         if (rs_toggle_antenna(valid_tx_ant,
1409                                               &search_tbl->current_rate,
1410                                               search_tbl)) {
1411                                 update_search_tbl_counter = 1;
1412                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1413                                 goto out;
1414                         }
1415                         break;
1416                 case IWL_LEGACY_SWITCH_SISO:
1417                         IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to SISO\n");
1418
1419                         /* Set up search table to try SISO */
1420                         memcpy(search_tbl, tbl, sz);
1421                         search_tbl->is_SGI = 0;
1422                         ret = rs_switch_to_siso(mvm, lq_sta, sta,
1423                                                  search_tbl, index);
1424                         if (!ret) {
1425                                 lq_sta->action_counter = 0;
1426                                 goto out;
1427                         }
1428
1429                         break;
1430                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1431                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1432                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1433                         IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO2\n");
1434
1435                         /* Set up search table to try MIMO */
1436                         memcpy(search_tbl, tbl, sz);
1437                         search_tbl->is_SGI = 0;
1438
1439                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1440                                 search_tbl->ant_type = ANT_AB;
1441                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1442                                 search_tbl->ant_type = ANT_AC;
1443                         else
1444                                 search_tbl->ant_type = ANT_BC;
1445
1446                         if (!rs_is_valid_ant(valid_tx_ant,
1447                                              search_tbl->ant_type))
1448                                 break;
1449
1450                         ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1451                                                  search_tbl, index);
1452                         if (!ret) {
1453                                 lq_sta->action_counter = 0;
1454                                 goto out;
1455                         }
1456                         break;
1457
1458                 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1459                         IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO3\n");
1460
1461                         /* Set up search table to try MIMO3 */
1462                         memcpy(search_tbl, tbl, sz);
1463                         search_tbl->is_SGI = 0;
1464
1465                         search_tbl->ant_type = ANT_ABC;
1466
1467                         if (!rs_is_valid_ant(valid_tx_ant,
1468                                              search_tbl->ant_type))
1469                                 break;
1470
1471                         ret = rs_switch_to_mimo3(mvm, lq_sta, sta,
1472                                                  search_tbl, index);
1473                         if (!ret) {
1474                                 lq_sta->action_counter = 0;
1475                                 goto out;
1476                         }
1477                         break;
1478                 }
1479                 tbl->action++;
1480                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1481                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1482
1483                 if (tbl->action == start_action)
1484                         break;
1485         }
1486         search_tbl->lq_type = LQ_NONE;
1487         return 0;
1488
1489 out:
1490         lq_sta->search_better_tbl = 1;
1491         tbl->action++;
1492         if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1493                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1494         if (update_search_tbl_counter)
1495                 search_tbl->action = tbl->action;
1496         return 0;
1497 }
1498
1499 /*
1500  * Try to switch to new modulation mode from SISO
1501  */
1502 static int rs_move_siso_to_other(struct iwl_mvm *mvm,
1503                                  struct iwl_lq_sta *lq_sta,
1504                                  struct ieee80211_sta *sta, int index)
1505 {
1506         u8 is_green = lq_sta->is_green;
1507         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1508         struct iwl_scale_tbl_info *search_tbl =
1509                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1510         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1511         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1512         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1513                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1514         u8 start_action;
1515         u8 valid_tx_ant = mvm->nvm_data->valid_tx_ant;
1516         u8 tx_chains_num = num_of_ant(valid_tx_ant);
1517         u8 update_search_tbl_counter = 0;
1518         int ret;
1519
1520         start_action = tbl->action;
1521         while (1) {
1522                 lq_sta->action_counter++;
1523                 switch (tbl->action) {
1524                 case IWL_SISO_SWITCH_ANTENNA1:
1525                 case IWL_SISO_SWITCH_ANTENNA2:
1526                         IWL_DEBUG_RATE(mvm, "LQ: SISO toggle Antenna\n");
1527                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1528                              tx_chains_num <= 1) ||
1529                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1530                              tx_chains_num <= 2))
1531                                 break;
1532
1533                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1534                                 break;
1535
1536                         memcpy(search_tbl, tbl, sz);
1537                         if (rs_toggle_antenna(valid_tx_ant,
1538                                               &search_tbl->current_rate,
1539                                               search_tbl)) {
1540                                 update_search_tbl_counter = 1;
1541                                 goto out;
1542                         }
1543                         break;
1544                 case IWL_SISO_SWITCH_MIMO2_AB:
1545                 case IWL_SISO_SWITCH_MIMO2_AC:
1546                 case IWL_SISO_SWITCH_MIMO2_BC:
1547                         IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO2\n");
1548                         memcpy(search_tbl, tbl, sz);
1549                         search_tbl->is_SGI = 0;
1550
1551                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1552                                 search_tbl->ant_type = ANT_AB;
1553                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1554                                 search_tbl->ant_type = ANT_AC;
1555                         else
1556                                 search_tbl->ant_type = ANT_BC;
1557
1558                         if (!rs_is_valid_ant(valid_tx_ant,
1559                                              search_tbl->ant_type))
1560                                 break;
1561
1562                         ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1563                                                  search_tbl, index);
1564                         if (!ret)
1565                                 goto out;
1566                         break;
1567                 case IWL_SISO_SWITCH_GI:
1568                         if (!tbl->is_ht40 && !(ht_cap->cap &
1569                                                 IEEE80211_HT_CAP_SGI_20))
1570                                 break;
1571                         if (tbl->is_ht40 && !(ht_cap->cap &
1572                                                 IEEE80211_HT_CAP_SGI_40))
1573                                 break;
1574
1575                         IWL_DEBUG_RATE(mvm, "LQ: SISO toggle SGI/NGI\n");
1576
1577                         memcpy(search_tbl, tbl, sz);
1578                         if (is_green) {
1579                                 if (!tbl->is_SGI)
1580                                         break;
1581                                 else
1582                                         IWL_ERR(mvm,
1583                                                 "SGI was set in GF+SISO\n");
1584                         }
1585                         search_tbl->is_SGI = !tbl->is_SGI;
1586                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1587                         if (tbl->is_SGI) {
1588                                 s32 tpt = lq_sta->last_tpt / 100;
1589                                 if (tpt >= search_tbl->expected_tpt[index])
1590                                         break;
1591                         }
1592                         search_tbl->current_rate =
1593                                 rate_n_flags_from_tbl(mvm, search_tbl,
1594                                                       index, is_green);
1595                         update_search_tbl_counter = 1;
1596                         goto out;
1597                 case IWL_SISO_SWITCH_MIMO3_ABC:
1598                         IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO3\n");
1599                         memcpy(search_tbl, tbl, sz);
1600                         search_tbl->is_SGI = 0;
1601                         search_tbl->ant_type = ANT_ABC;
1602
1603                         if (!rs_is_valid_ant(valid_tx_ant,
1604                                              search_tbl->ant_type))
1605                                 break;
1606
1607                         ret = rs_switch_to_mimo3(mvm, lq_sta, sta,
1608                                                  search_tbl, index);
1609                         if (!ret)
1610                                 goto out;
1611                         break;
1612                 }
1613                 tbl->action++;
1614                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1615                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1616
1617                 if (tbl->action == start_action)
1618                         break;
1619         }
1620         search_tbl->lq_type = LQ_NONE;
1621         return 0;
1622
1623  out:
1624         lq_sta->search_better_tbl = 1;
1625         tbl->action++;
1626         if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1627                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1628         if (update_search_tbl_counter)
1629                 search_tbl->action = tbl->action;
1630
1631         return 0;
1632 }
1633
1634 /*
1635  * Try to switch to new modulation mode from MIMO2
1636  */
1637 static int rs_move_mimo2_to_other(struct iwl_mvm *mvm,
1638                                  struct iwl_lq_sta *lq_sta,
1639                                  struct ieee80211_sta *sta, int index)
1640 {
1641         s8 is_green = lq_sta->is_green;
1642         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1643         struct iwl_scale_tbl_info *search_tbl =
1644                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1645         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1646         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1647         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1648                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1649         u8 start_action;
1650         u8 valid_tx_ant = mvm->nvm_data->valid_tx_ant;
1651         u8 tx_chains_num = num_of_ant(valid_tx_ant);
1652         u8 update_search_tbl_counter = 0;
1653         int ret;
1654
1655         start_action = tbl->action;
1656         while (1) {
1657                 lq_sta->action_counter++;
1658                 switch (tbl->action) {
1659                 case IWL_MIMO2_SWITCH_ANTENNA1:
1660                 case IWL_MIMO2_SWITCH_ANTENNA2:
1661                         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle Antennas\n");
1662
1663                         if (tx_chains_num <= 2)
1664                                 break;
1665
1666                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1667                                 break;
1668
1669                         memcpy(search_tbl, tbl, sz);
1670                         if (rs_toggle_antenna(valid_tx_ant,
1671                                               &search_tbl->current_rate,
1672                                               search_tbl)) {
1673                                 update_search_tbl_counter = 1;
1674                                 goto out;
1675                         }
1676                         break;
1677                 case IWL_MIMO2_SWITCH_SISO_A:
1678                 case IWL_MIMO2_SWITCH_SISO_B:
1679                 case IWL_MIMO2_SWITCH_SISO_C:
1680                         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to SISO\n");
1681
1682                         /* Set up new search table for SISO */
1683                         memcpy(search_tbl, tbl, sz);
1684
1685                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1686                                 search_tbl->ant_type = ANT_A;
1687                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1688                                 search_tbl->ant_type = ANT_B;
1689                         else
1690                                 search_tbl->ant_type = ANT_C;
1691
1692                         if (!rs_is_valid_ant(valid_tx_ant,
1693                                              search_tbl->ant_type))
1694                                 break;
1695
1696                         ret = rs_switch_to_siso(mvm, lq_sta, sta,
1697                                                  search_tbl, index);
1698                         if (!ret)
1699                                 goto out;
1700
1701                         break;
1702
1703                 case IWL_MIMO2_SWITCH_GI:
1704                         if (!tbl->is_ht40 && !(ht_cap->cap &
1705                                                 IEEE80211_HT_CAP_SGI_20))
1706                                 break;
1707                         if (tbl->is_ht40 && !(ht_cap->cap &
1708                                                 IEEE80211_HT_CAP_SGI_40))
1709                                 break;
1710
1711                         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle SGI/NGI\n");
1712
1713                         /* Set up new search table for MIMO2 */
1714                         memcpy(search_tbl, tbl, sz);
1715                         search_tbl->is_SGI = !tbl->is_SGI;
1716                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1717                         /*
1718                          * If active table already uses the fastest possible
1719                          * modulation (dual stream with short guard interval),
1720                          * and it's working well, there's no need to look
1721                          * for a better type of modulation!
1722                          */
1723                         if (tbl->is_SGI) {
1724                                 s32 tpt = lq_sta->last_tpt / 100;
1725                                 if (tpt >= search_tbl->expected_tpt[index])
1726                                         break;
1727                         }
1728                         search_tbl->current_rate =
1729                                 rate_n_flags_from_tbl(mvm, search_tbl,
1730                                                       index, is_green);
1731                         update_search_tbl_counter = 1;
1732                         goto out;
1733
1734                 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1735                         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to MIMO3\n");
1736                         memcpy(search_tbl, tbl, sz);
1737                         search_tbl->is_SGI = 0;
1738                         search_tbl->ant_type = ANT_ABC;
1739
1740                         if (!rs_is_valid_ant(valid_tx_ant,
1741                                              search_tbl->ant_type))
1742                                 break;
1743
1744                         ret = rs_switch_to_mimo3(mvm, lq_sta, sta,
1745                                                  search_tbl, index);
1746                         if (!ret)
1747                                 goto out;
1748
1749                         break;
1750                 }
1751                 tbl->action++;
1752                 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1753                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1754
1755                 if (tbl->action == start_action)
1756                         break;
1757         }
1758         search_tbl->lq_type = LQ_NONE;
1759         return 0;
1760  out:
1761         lq_sta->search_better_tbl = 1;
1762         tbl->action++;
1763         if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1764                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1765         if (update_search_tbl_counter)
1766                 search_tbl->action = tbl->action;
1767
1768         return 0;
1769 }
1770
1771 /*
1772  * Try to switch to new modulation mode from MIMO3
1773  */
1774 static int rs_move_mimo3_to_other(struct iwl_mvm *mvm,
1775                                  struct iwl_lq_sta *lq_sta,
1776                                  struct ieee80211_sta *sta, int index)
1777 {
1778         s8 is_green = lq_sta->is_green;
1779         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1780         struct iwl_scale_tbl_info *search_tbl =
1781                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1782         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1783         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1784         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1785                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1786         u8 start_action;
1787         u8 valid_tx_ant = mvm->nvm_data->valid_tx_ant;
1788         u8 tx_chains_num = num_of_ant(valid_tx_ant);
1789         int ret;
1790         u8 update_search_tbl_counter = 0;
1791
1792         start_action = tbl->action;
1793         while (1) {
1794                 lq_sta->action_counter++;
1795                 switch (tbl->action) {
1796                 case IWL_MIMO3_SWITCH_ANTENNA1:
1797                 case IWL_MIMO3_SWITCH_ANTENNA2:
1798                         IWL_DEBUG_RATE(mvm, "LQ: MIMO3 toggle Antennas\n");
1799
1800                         if (tx_chains_num <= 3)
1801                                 break;
1802
1803                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1804                                 break;
1805
1806                         memcpy(search_tbl, tbl, sz);
1807                         if (rs_toggle_antenna(valid_tx_ant,
1808                                               &search_tbl->current_rate,
1809                                               search_tbl))
1810                                 goto out;
1811                         break;
1812                 case IWL_MIMO3_SWITCH_SISO_A:
1813                 case IWL_MIMO3_SWITCH_SISO_B:
1814                 case IWL_MIMO3_SWITCH_SISO_C:
1815                         IWL_DEBUG_RATE(mvm, "LQ: MIMO3 switch to SISO\n");
1816
1817                         /* Set up new search table for SISO */
1818                         memcpy(search_tbl, tbl, sz);
1819
1820                         if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1821                                 search_tbl->ant_type = ANT_A;
1822                         else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1823                                 search_tbl->ant_type = ANT_B;
1824                         else
1825                                 search_tbl->ant_type = ANT_C;
1826
1827                         if (!rs_is_valid_ant(valid_tx_ant,
1828                                              search_tbl->ant_type))
1829                                 break;
1830
1831                         ret = rs_switch_to_siso(mvm, lq_sta, sta,
1832                                                 search_tbl, index);
1833                         if (!ret)
1834                                 goto out;
1835
1836                         break;
1837
1838                 case IWL_MIMO3_SWITCH_MIMO2_AB:
1839                 case IWL_MIMO3_SWITCH_MIMO2_AC:
1840                 case IWL_MIMO3_SWITCH_MIMO2_BC:
1841                         IWL_DEBUG_RATE(mvm, "LQ: MIMO3 switch to MIMO2\n");
1842
1843                         memcpy(search_tbl, tbl, sz);
1844                         search_tbl->is_SGI = 0;
1845                         if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1846                                 search_tbl->ant_type = ANT_AB;
1847                         else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1848                                 search_tbl->ant_type = ANT_AC;
1849                         else
1850                                 search_tbl->ant_type = ANT_BC;
1851
1852                         if (!rs_is_valid_ant(valid_tx_ant,
1853                                              search_tbl->ant_type))
1854                                 break;
1855
1856                         ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1857                                                  search_tbl, index);
1858                         if (!ret)
1859                                 goto out;
1860
1861                         break;
1862
1863                 case IWL_MIMO3_SWITCH_GI:
1864                         if (!tbl->is_ht40 && !(ht_cap->cap &
1865                                                 IEEE80211_HT_CAP_SGI_20))
1866                                 break;
1867                         if (tbl->is_ht40 && !(ht_cap->cap &
1868                                                 IEEE80211_HT_CAP_SGI_40))
1869                                 break;
1870
1871                         IWL_DEBUG_RATE(mvm, "LQ: MIMO3 toggle SGI/NGI\n");
1872
1873                         /* Set up new search table for MIMO */
1874                         memcpy(search_tbl, tbl, sz);
1875                         search_tbl->is_SGI = !tbl->is_SGI;
1876                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1877                         /*
1878                          * If active table already uses the fastest possible
1879                          * modulation (dual stream with short guard interval),
1880                          * and it's working well, there's no need to look
1881                          * for a better type of modulation!
1882                          */
1883                         if (tbl->is_SGI) {
1884                                 s32 tpt = lq_sta->last_tpt / 100;
1885                                 if (tpt >= search_tbl->expected_tpt[index])
1886                                         break;
1887                         }
1888                         search_tbl->current_rate =
1889                                 rate_n_flags_from_tbl(mvm, search_tbl,
1890                                                       index, is_green);
1891                         update_search_tbl_counter = 1;
1892                         goto out;
1893                 }
1894                 tbl->action++;
1895                 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1896                         tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1897
1898                 if (tbl->action == start_action)
1899                         break;
1900         }
1901         search_tbl->lq_type = LQ_NONE;
1902         return 0;
1903  out:
1904         lq_sta->search_better_tbl = 1;
1905         tbl->action++;
1906         if (tbl->action > IWL_MIMO3_SWITCH_GI)
1907                 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1908         if (update_search_tbl_counter)
1909                 search_tbl->action = tbl->action;
1910
1911         return 0;
1912 }
1913
1914 /*
1915  * Check whether we should continue using same modulation mode, or
1916  * begin search for a new mode, based on:
1917  * 1) # tx successes or failures while using this mode
1918  * 2) # times calling this function
1919  * 3) elapsed time in this mode (not used, for now)
1920  */
1921 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1922 {
1923         struct iwl_scale_tbl_info *tbl;
1924         int i;
1925         int active_tbl;
1926         int flush_interval_passed = 0;
1927         struct iwl_mvm *mvm;
1928
1929         mvm = lq_sta->drv;
1930         active_tbl = lq_sta->active_tbl;
1931
1932         tbl = &(lq_sta->lq_info[active_tbl]);
1933
1934         /* If we've been disallowing search, see if we should now allow it */
1935         if (lq_sta->stay_in_tbl) {
1936                 /* Elapsed time using current modulation mode */
1937                 if (lq_sta->flush_timer)
1938                         flush_interval_passed =
1939                                 time_after(jiffies,
1940                                            (unsigned long)(lq_sta->flush_timer +
1941                                                 IWL_RATE_SCALE_FLUSH_INTVL));
1942
1943                 /*
1944                  * Check if we should allow search for new modulation mode.
1945                  * If many frames have failed or succeeded, or we've used
1946                  * this same modulation for a long time, allow search, and
1947                  * reset history stats that keep track of whether we should
1948                  * allow a new search.  Also (below) reset all bitmaps and
1949                  * stats in active history.
1950                  */
1951                 if (force_search ||
1952                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1953                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1954                     ((!lq_sta->search_better_tbl) &&
1955                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1956                         IWL_DEBUG_RATE(mvm,
1957                                        "LQ: stay is expired %d %d %d\n",
1958                                      lq_sta->total_failed,
1959                                      lq_sta->total_success,
1960                                      flush_interval_passed);
1961
1962                         /* Allow search for new mode */
1963                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1964                         lq_sta->total_failed = 0;
1965                         lq_sta->total_success = 0;
1966                         lq_sta->flush_timer = 0;
1967                 /*
1968                  * Else if we've used this modulation mode enough repetitions
1969                  * (regardless of elapsed time or success/failure), reset
1970                  * history bitmaps and rate-specific stats for all rates in
1971                  * active table.
1972                  */
1973                 } else {
1974                         lq_sta->table_count++;
1975                         if (lq_sta->table_count >=
1976                             lq_sta->table_count_limit) {
1977                                 lq_sta->table_count = 0;
1978
1979                                 IWL_DEBUG_RATE(mvm,
1980                                                "LQ: stay in table clear win\n");
1981                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1982                                         rs_rate_scale_clear_window(
1983                                                 &(tbl->win[i]));
1984                         }
1985                 }
1986
1987                 /* If transitioning to allow "search", reset all history
1988                  * bitmaps and stats in active table (this will become the new
1989                  * "search" table). */
1990                 if (!lq_sta->stay_in_tbl) {
1991                         for (i = 0; i < IWL_RATE_COUNT; i++)
1992                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1993                 }
1994         }
1995 }
1996
1997 /*
1998  * setup rate table in uCode
1999  */
2000 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
2001                                struct iwl_lq_sta *lq_sta,
2002                                struct iwl_scale_tbl_info *tbl,
2003                                int index, u8 is_green)
2004 {
2005         u32 rate;
2006
2007         /* Update uCode's rate table. */
2008         rate = rate_n_flags_from_tbl(mvm, tbl, index, is_green);
2009         rs_fill_link_cmd(mvm, lq_sta, rate);
2010         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
2011 }
2012
2013 /*
2014  * Do rate scaling and search for new modulation mode.
2015  */
2016 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2017                                   struct sk_buff *skb,
2018                                   struct ieee80211_sta *sta,
2019                                   struct iwl_lq_sta *lq_sta)
2020 {
2021         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2022         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2023         int low = IWL_RATE_INVALID;
2024         int high = IWL_RATE_INVALID;
2025         int index;
2026         int i;
2027         struct iwl_rate_scale_data *window = NULL;
2028         int current_tpt = IWL_INVALID_VALUE;
2029         int low_tpt = IWL_INVALID_VALUE;
2030         int high_tpt = IWL_INVALID_VALUE;
2031         u32 fail_count;
2032         s8 scale_action = 0;
2033         u16 rate_mask;
2034         u8 update_lq = 0;
2035         struct iwl_scale_tbl_info *tbl, *tbl1;
2036         u16 rate_scale_index_msk = 0;
2037         u8 is_green = 0;
2038         u8 active_tbl = 0;
2039         u8 done_search = 0;
2040         u16 high_low;
2041         s32 sr;
2042         u8 tid = IWL_MAX_TID_COUNT;
2043         struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
2044         struct iwl_mvm_tid_data *tid_data;
2045
2046         IWL_DEBUG_RATE(mvm, "rate scale calculate new rate for skb\n");
2047
2048         /* Send management frames and NO_ACK data using lowest rate. */
2049         /* TODO: this could probably be improved.. */
2050         if (!ieee80211_is_data(hdr->frame_control) ||
2051             info->flags & IEEE80211_TX_CTL_NO_ACK)
2052                 return;
2053
2054         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2055
2056         tid = rs_tl_add_packet(lq_sta, hdr);
2057         if ((tid != IWL_MAX_TID_COUNT) &&
2058             (lq_sta->tx_agg_tid_en & (1 << tid))) {
2059                 tid_data = &sta_priv->tid_data[tid];
2060                 if (tid_data->state == IWL_AGG_OFF)
2061                         lq_sta->is_agg = 0;
2062                 else
2063                         lq_sta->is_agg = 1;
2064         } else {
2065                 lq_sta->is_agg = 0;
2066         }
2067
2068         /*
2069          * Select rate-scale / modulation-mode table to work with in
2070          * the rest of this function:  "search" if searching for better
2071          * modulation mode, or "active" if doing rate scaling within a mode.
2072          */
2073         if (!lq_sta->search_better_tbl)
2074                 active_tbl = lq_sta->active_tbl;
2075         else
2076                 active_tbl = 1 - lq_sta->active_tbl;
2077
2078         tbl = &(lq_sta->lq_info[active_tbl]);
2079         if (is_legacy(tbl->lq_type))
2080                 lq_sta->is_green = 0;
2081         else
2082                 lq_sta->is_green = rs_use_green(sta);
2083         is_green = lq_sta->is_green;
2084
2085         /* current tx rate */
2086         index = lq_sta->last_txrate_idx;
2087
2088         IWL_DEBUG_RATE(mvm, "Rate scale index %d for type %d\n", index,
2089                        tbl->lq_type);
2090
2091         /* rates available for this association, and for modulation mode */
2092         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2093
2094         IWL_DEBUG_RATE(mvm, "mask 0x%04X\n", rate_mask);
2095
2096         /* mask with station rate restriction */
2097         if (is_legacy(tbl->lq_type)) {
2098                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2099                         /* supp_rates has no CCK bits in A mode */
2100                         rate_scale_index_msk = (u16) (rate_mask &
2101                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2102                 else
2103                         rate_scale_index_msk = (u16) (rate_mask &
2104                                                       lq_sta->supp_rates);
2105
2106         } else {
2107                 rate_scale_index_msk = rate_mask;
2108         }
2109
2110         if (!rate_scale_index_msk)
2111                 rate_scale_index_msk = rate_mask;
2112
2113         if (!((1 << index) & rate_scale_index_msk)) {
2114                 IWL_ERR(mvm, "Current Rate is not valid\n");
2115                 if (lq_sta->search_better_tbl) {
2116                         /* revert to active table if search table is not valid*/
2117                         tbl->lq_type = LQ_NONE;
2118                         lq_sta->search_better_tbl = 0;
2119                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2120                         /* get "active" rate info */
2121                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2122                         rs_update_rate_tbl(mvm, lq_sta, tbl, index, is_green);
2123                 }
2124                 return;
2125         }
2126
2127         /* Get expected throughput table and history window for current rate */
2128         if (!tbl->expected_tpt) {
2129                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2130                 return;
2131         }
2132
2133         /* force user max rate if set by user */
2134         if ((lq_sta->max_rate_idx != -1) &&
2135             (lq_sta->max_rate_idx < index)) {
2136                 index = lq_sta->max_rate_idx;
2137                 update_lq = 1;
2138                 window = &(tbl->win[index]);
2139                 goto lq_update;
2140         }
2141
2142         window = &(tbl->win[index]);
2143
2144         /*
2145          * If there is not enough history to calculate actual average
2146          * throughput, keep analyzing results of more tx frames, without
2147          * changing rate or mode (bypass most of the rest of this function).
2148          * Set up new rate table in uCode only if old rate is not supported
2149          * in current association (use new rate found above).
2150          */
2151         fail_count = window->counter - window->success_counter;
2152         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2153             (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2154                 IWL_DEBUG_RATE(mvm,
2155                                "LQ: still below TH. succ=%d total=%d for index %d\n",
2156                                window->success_counter, window->counter, index);
2157
2158                 /* Can't calculate this yet; not enough history */
2159                 window->average_tpt = IWL_INVALID_VALUE;
2160
2161                 /* Should we stay with this modulation mode,
2162                  * or search for a new one? */
2163                 rs_stay_in_table(lq_sta, false);
2164
2165                 goto out;
2166         }
2167         /* Else we have enough samples; calculate estimate of
2168          * actual average throughput */
2169         if (window->average_tpt != ((window->success_ratio *
2170                         tbl->expected_tpt[index] + 64) / 128)) {
2171                 IWL_ERR(mvm,
2172                         "expected_tpt should have been calculated by now\n");
2173                 window->average_tpt = ((window->success_ratio *
2174                                         tbl->expected_tpt[index] + 64) / 128);
2175         }
2176
2177         /* If we are searching for better modulation mode, check success. */
2178         if (lq_sta->search_better_tbl) {
2179                 /* If good success, continue using the "search" mode;
2180                  * no need to send new link quality command, since we're
2181                  * continuing to use the setup that we've been trying. */
2182                 if (window->average_tpt > lq_sta->last_tpt) {
2183                         IWL_DEBUG_RATE(mvm,
2184                                        "LQ: SWITCHING TO NEW TABLE suc=%d cur-tpt=%d old-tpt=%d\n",
2185                                        window->success_ratio,
2186                                        window->average_tpt,
2187                                        lq_sta->last_tpt);
2188
2189                         if (!is_legacy(tbl->lq_type))
2190                                 lq_sta->enable_counter = 1;
2191
2192                         /* Swap tables; "search" becomes "active" */
2193                         lq_sta->active_tbl = active_tbl;
2194                         current_tpt = window->average_tpt;
2195                 /* Else poor success; go back to mode in "active" table */
2196                 } else {
2197                         IWL_DEBUG_RATE(mvm,
2198                                        "LQ: GOING BACK TO THE OLD TABLE suc=%d cur-tpt=%d old-tpt=%d\n",
2199                                        window->success_ratio,
2200                                        window->average_tpt,
2201                                        lq_sta->last_tpt);
2202
2203                         /* Nullify "search" table */
2204                         tbl->lq_type = LQ_NONE;
2205
2206                         /* Revert to "active" table */
2207                         active_tbl = lq_sta->active_tbl;
2208                         tbl = &(lq_sta->lq_info[active_tbl]);
2209
2210                         /* Revert to "active" rate and throughput info */
2211                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2212                         current_tpt = lq_sta->last_tpt;
2213
2214                         /* Need to set up a new rate table in uCode */
2215                         update_lq = 1;
2216                 }
2217
2218                 /* Either way, we've made a decision; modulation mode
2219                  * search is done, allow rate adjustment next time. */
2220                 lq_sta->search_better_tbl = 0;
2221                 done_search = 1;        /* Don't switch modes below! */
2222                 goto lq_update;
2223         }
2224
2225         /* (Else) not in search of better modulation mode, try for better
2226          * starting rate, while staying in this mode. */
2227         high_low = rs_get_adjacent_rate(mvm, index, rate_scale_index_msk,
2228                                         tbl->lq_type);
2229         low = high_low & 0xff;
2230         high = (high_low >> 8) & 0xff;
2231
2232         /* If user set max rate, dont allow higher than user constrain */
2233         if ((lq_sta->max_rate_idx != -1) &&
2234             (lq_sta->max_rate_idx < high))
2235                 high = IWL_RATE_INVALID;
2236
2237         sr = window->success_ratio;
2238
2239         /* Collect measured throughputs for current and adjacent rates */
2240         current_tpt = window->average_tpt;
2241         if (low != IWL_RATE_INVALID)
2242                 low_tpt = tbl->win[low].average_tpt;
2243         if (high != IWL_RATE_INVALID)
2244                 high_tpt = tbl->win[high].average_tpt;
2245
2246         scale_action = 0;
2247
2248         /* Too many failures, decrease rate */
2249         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2250                 IWL_DEBUG_RATE(mvm,
2251                                "decrease rate because of low success_ratio\n");
2252                 scale_action = -1;
2253         /* No throughput measured yet for adjacent rates; try increase. */
2254         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2255                    (high_tpt == IWL_INVALID_VALUE)) {
2256                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2257                         scale_action = 1;
2258                 else if (low != IWL_RATE_INVALID)
2259                         scale_action = 0;
2260         }
2261
2262         /* Both adjacent throughputs are measured, but neither one has better
2263          * throughput; we're using the best rate, don't change it! */
2264         else if ((low_tpt != IWL_INVALID_VALUE) &&
2265                  (high_tpt != IWL_INVALID_VALUE) &&
2266                  (low_tpt < current_tpt) &&
2267                  (high_tpt < current_tpt))
2268                 scale_action = 0;
2269
2270         /* At least one adjacent rate's throughput is measured,
2271          * and may have better performance. */
2272         else {
2273                 /* Higher adjacent rate's throughput is measured */
2274                 if (high_tpt != IWL_INVALID_VALUE) {
2275                         /* Higher rate has better throughput */
2276                         if (high_tpt > current_tpt &&
2277                             sr >= IWL_RATE_INCREASE_TH) {
2278                                 scale_action = 1;
2279                         } else {
2280                                 scale_action = 0;
2281                         }
2282
2283                 /* Lower adjacent rate's throughput is measured */
2284                 } else if (low_tpt != IWL_INVALID_VALUE) {
2285                         /* Lower rate has better throughput */
2286                         if (low_tpt > current_tpt) {
2287                                 IWL_DEBUG_RATE(mvm,
2288                                                "decrease rate because of low tpt\n");
2289                                 scale_action = -1;
2290                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2291                                 scale_action = 1;
2292                         }
2293                 }
2294         }
2295
2296         /* Sanity check; asked for decrease, but success rate or throughput
2297          * has been good at old rate.  Don't change it. */
2298         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2299             ((sr > IWL_RATE_HIGH_TH) ||
2300              (current_tpt > (100 * tbl->expected_tpt[low]))))
2301                 scale_action = 0;
2302
2303         switch (scale_action) {
2304         case -1:
2305                 /* Decrease starting rate, update uCode's rate table */
2306                 if (low != IWL_RATE_INVALID) {
2307                         update_lq = 1;
2308                         index = low;
2309                 }
2310
2311                 break;
2312         case 1:
2313                 /* Increase starting rate, update uCode's rate table */
2314                 if (high != IWL_RATE_INVALID) {
2315                         update_lq = 1;
2316                         index = high;
2317                 }
2318
2319                 break;
2320         case 0:
2321                 /* No change */
2322         default:
2323                 break;
2324         }
2325
2326         IWL_DEBUG_RATE(mvm,
2327                        "choose rate scale index %d action %d low %d high %d type %d\n",
2328                        index, scale_action, low, high, tbl->lq_type);
2329
2330 lq_update:
2331         /* Replace uCode's rate table for the destination station. */
2332         if (update_lq)
2333                 rs_update_rate_tbl(mvm, lq_sta, tbl, index, is_green);
2334
2335         rs_stay_in_table(lq_sta, false);
2336
2337         /*
2338          * Search for new modulation mode if we're:
2339          * 1)  Not changing rates right now
2340          * 2)  Not just finishing up a search
2341          * 3)  Allowing a new search
2342          */
2343         if (!update_lq && !done_search &&
2344             !lq_sta->stay_in_tbl && window->counter) {
2345                 /* Save current throughput to compare with "search" throughput*/
2346                 lq_sta->last_tpt = current_tpt;
2347
2348                 /* Select a new "search" modulation mode to try.
2349                  * If one is found, set up the new "search" table. */
2350                 if (is_legacy(tbl->lq_type))
2351                         rs_move_legacy_other(mvm, lq_sta, sta, index);
2352                 else if (is_siso(tbl->lq_type))
2353                         rs_move_siso_to_other(mvm, lq_sta, sta, index);
2354                 else if (is_mimo2(tbl->lq_type))
2355                         rs_move_mimo2_to_other(mvm, lq_sta, sta, index);
2356                 else
2357                         rs_move_mimo3_to_other(mvm, lq_sta, sta, index);
2358
2359                 /* If new "search" mode was selected, set up in uCode table */
2360                 if (lq_sta->search_better_tbl) {
2361                         /* Access the "search" table, clear its history. */
2362                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2363                         for (i = 0; i < IWL_RATE_COUNT; i++)
2364                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2365
2366                         /* Use new "search" start rate */
2367                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2368
2369                         IWL_DEBUG_RATE(mvm,
2370                                        "Switch current  mcs: %X index: %d\n",
2371                                        tbl->current_rate, index);
2372                         rs_fill_link_cmd(mvm, lq_sta, tbl->current_rate);
2373                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
2374                 } else {
2375                         done_search = 1;
2376                 }
2377         }
2378
2379         if (done_search && !lq_sta->stay_in_tbl) {
2380                 /* If the "active" (non-search) mode was legacy,
2381                  * and we've tried switching antennas,
2382                  * but we haven't been able to try HT modes (not available),
2383                  * stay with best antenna legacy modulation for a while
2384                  * before next round of mode comparisons. */
2385                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2386                 if (is_legacy(tbl1->lq_type) && !sta->ht_cap.ht_supported &&
2387                     lq_sta->action_counter > tbl1->max_search) {
2388                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2389                         rs_set_stay_in_table(mvm, 1, lq_sta);
2390                 }
2391
2392                 /* If we're in an HT mode, and all 3 mode switch actions
2393                  * have been tried and compared, stay in this best modulation
2394                  * mode for a while before next round of mode comparisons. */
2395                 if (lq_sta->enable_counter &&
2396                     (lq_sta->action_counter >= tbl1->max_search)) {
2397                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2398                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2399                             (tid != IWL_MAX_TID_COUNT)) {
2400                                 tid_data = &sta_priv->tid_data[tid];
2401                                 if (tid_data->state == IWL_AGG_OFF) {
2402                                         IWL_DEBUG_RATE(mvm,
2403                                                        "try to aggregate tid %d\n",
2404                                                        tid);
2405                                         rs_tl_turn_on_agg(mvm, tid,
2406                                                           lq_sta, sta);
2407                                 }
2408                         }
2409                         rs_set_stay_in_table(mvm, 0, lq_sta);
2410                 }
2411         }
2412
2413 out:
2414         tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, index, is_green);
2415         lq_sta->last_txrate_idx = index;
2416 }
2417
2418 /**
2419  * rs_initialize_lq - Initialize a station's hardware rate table
2420  *
2421  * The uCode's station table contains a table of fallback rates
2422  * for automatic fallback during transmission.
2423  *
2424  * NOTE: This sets up a default set of values.  These will be replaced later
2425  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2426  *       rc80211_simple.
2427  *
2428  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2429  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2430  *       which requires station table entry to exist).
2431  */
2432 static void rs_initialize_lq(struct iwl_mvm *mvm,
2433                              struct ieee80211_sta *sta,
2434                              struct iwl_lq_sta *lq_sta,
2435                              enum ieee80211_band band)
2436 {
2437         struct iwl_scale_tbl_info *tbl;
2438         int rate_idx;
2439         int i;
2440         u32 rate;
2441         u8 use_green = rs_use_green(sta);
2442         u8 active_tbl = 0;
2443         u8 valid_tx_ant;
2444
2445         if (!sta || !lq_sta)
2446                 return;
2447
2448         i = lq_sta->last_txrate_idx;
2449
2450         valid_tx_ant = mvm->nvm_data->valid_tx_ant;
2451
2452         if (!lq_sta->search_better_tbl)
2453                 active_tbl = lq_sta->active_tbl;
2454         else
2455                 active_tbl = 1 - lq_sta->active_tbl;
2456
2457         tbl = &(lq_sta->lq_info[active_tbl]);
2458
2459         if ((i < 0) || (i >= IWL_RATE_COUNT))
2460                 i = 0;
2461
2462         rate = iwl_rates[i].plcp;
2463         tbl->ant_type = first_antenna(valid_tx_ant);
2464         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2465
2466         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2467                 rate |= RATE_MCS_CCK_MSK;
2468
2469         rs_get_tbl_info_from_mcs(rate, band, tbl, &rate_idx);
2470         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2471                 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2472
2473         rate = rate_n_flags_from_tbl(mvm, tbl, rate_idx, use_green);
2474         tbl->current_rate = rate;
2475         rs_set_expected_tpt_table(lq_sta, tbl);
2476         rs_fill_link_cmd(NULL, lq_sta, rate);
2477         /* TODO restore station should remember the lq cmd */
2478         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_SYNC, true);
2479 }
2480
2481 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2482                         struct ieee80211_tx_rate_control *txrc)
2483 {
2484         struct sk_buff *skb = txrc->skb;
2485         struct ieee80211_supported_band *sband = txrc->sband;
2486         struct iwl_op_mode *op_mode __maybe_unused =
2487                         (struct iwl_op_mode *)mvm_r;
2488         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2489         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2490         struct iwl_lq_sta *lq_sta = mvm_sta;
2491         int rate_idx;
2492
2493         IWL_DEBUG_RATE_LIMIT(mvm, "rate scale calculate new rate for skb\n");
2494
2495         /* Get max rate if user set max rate */
2496         if (lq_sta) {
2497                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2498                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2499                     (lq_sta->max_rate_idx != -1))
2500                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2501                 if ((lq_sta->max_rate_idx < 0) ||
2502                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2503                         lq_sta->max_rate_idx = -1;
2504         }
2505
2506         /* Treat uninitialized rate scaling data same as non-existing. */
2507         if (lq_sta && !lq_sta->drv) {
2508                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2509                 mvm_sta = NULL;
2510         }
2511
2512         /* Send management frames and NO_ACK data using lowest rate. */
2513         if (rate_control_send_low(sta, mvm_sta, txrc))
2514                 return;
2515
2516         rate_idx  = lq_sta->last_txrate_idx;
2517
2518         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2519                 rate_idx -= IWL_FIRST_OFDM_RATE;
2520                 /* 6M and 9M shared same MCS index */
2521                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2522                 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2523                     IWL_RATE_MIMO3_6M_PLCP)
2524                         rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2525                 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2526                          IWL_RATE_MIMO2_6M_PLCP)
2527                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2528                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2529                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2530                         info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2531                 if (lq_sta->last_rate_n_flags & RATE_MCS_CHAN_WIDTH_40) /* TODO */
2532                         info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2533                 if (lq_sta->last_rate_n_flags & RATE_HT_MCS_GF_MSK)
2534                         info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2535         } else {
2536                 /* Check for invalid rates */
2537                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2538                     ((sband->band == IEEE80211_BAND_5GHZ) &&
2539                      (rate_idx < IWL_FIRST_OFDM_RATE)))
2540                         rate_idx = rate_lowest_index(sband, sta);
2541                 /* On valid 5 GHz rate, adjust index */
2542                 else if (sband->band == IEEE80211_BAND_5GHZ)
2543                         rate_idx -= IWL_FIRST_OFDM_RATE;
2544                 info->control.rates[0].flags = 0;
2545         }
2546         info->control.rates[0].idx = rate_idx;
2547 }
2548
2549 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2550                           gfp_t gfp)
2551 {
2552         struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2553         struct iwl_op_mode *op_mode __maybe_unused =
2554                         (struct iwl_op_mode *)mvm_rate;
2555         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2556
2557         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2558
2559         return &sta_priv->lq_sta;
2560 }
2561
2562 /*
2563  * Called after adding a new station to initialize rate scaling
2564  */
2565 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2566                           enum ieee80211_band band)
2567 {
2568         int i, j;
2569         struct ieee80211_hw *hw = mvm->hw;
2570         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2571         struct iwl_mvm_sta *sta_priv;
2572         struct iwl_lq_sta *lq_sta;
2573         struct ieee80211_supported_band *sband;
2574         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2575
2576         sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2577         lq_sta = &sta_priv->lq_sta;
2578         sband = hw->wiphy->bands[band];
2579
2580         lq_sta->lq.sta_id = sta_priv->sta_id;
2581
2582         for (j = 0; j < LQ_SIZE; j++)
2583                 for (i = 0; i < IWL_RATE_COUNT; i++)
2584                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2585
2586         lq_sta->flush_timer = 0;
2587         lq_sta->supp_rates = sta->supp_rates[sband->band];
2588         for (j = 0; j < LQ_SIZE; j++)
2589                 for (i = 0; i < IWL_RATE_COUNT; i++)
2590                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2591
2592         IWL_DEBUG_RATE(mvm,
2593                        "LQ: *** rate scale station global init for station %d ***\n",
2594                        sta_priv->sta_id);
2595         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2596          * the lowest or the highest rate.. Could consider using RSSI from
2597          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2598          * after assoc.. */
2599
2600         lq_sta->max_rate_idx = -1;
2601         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2602         lq_sta->is_green = rs_use_green(sta);
2603         lq_sta->band = sband->band;
2604         /*
2605          * active legacy rates as per supported rates bitmap
2606          */
2607         supp = sta->supp_rates[sband->band];
2608         lq_sta->active_legacy_rate = 0;
2609         for_each_set_bit(i, &supp, BITS_PER_LONG)
2610                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2611
2612         /*
2613          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2614          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2615          */
2616         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2617         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2618         lq_sta->active_siso_rate &= ~((u16)0x2);
2619         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2620
2621         /* Same here */
2622         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2623         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2624         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2625         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2626
2627         lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2628         lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2629         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2630         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2631
2632         IWL_DEBUG_RATE(mvm,
2633                        "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2634                        lq_sta->active_siso_rate,
2635                        lq_sta->active_mimo2_rate,
2636                        lq_sta->active_mimo3_rate);
2637
2638         /* These values will be overridden later */
2639         lq_sta->lq.single_stream_ant_msk =
2640                 first_antenna(mvm->nvm_data->valid_tx_ant);
2641         lq_sta->lq.dual_stream_ant_msk =
2642                 mvm->nvm_data->valid_tx_ant &
2643                 ~first_antenna(mvm->nvm_data->valid_tx_ant);
2644         if (!lq_sta->lq.dual_stream_ant_msk) {
2645                 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2646         } else if (num_of_ant(mvm->nvm_data->valid_tx_ant) == 2) {
2647                 lq_sta->lq.dual_stream_ant_msk =
2648                         mvm->nvm_data->valid_tx_ant;
2649         }
2650
2651         /* as default allow aggregation for all tids */
2652         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2653         lq_sta->drv = mvm;
2654
2655         /* Set last_txrate_idx to lowest rate */
2656         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2657         if (sband->band == IEEE80211_BAND_5GHZ)
2658                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2659         lq_sta->is_agg = 0;
2660 #ifdef CONFIG_MAC80211_DEBUGFS
2661         lq_sta->dbg_fixed_rate = 0;
2662 #endif
2663
2664         rs_initialize_lq(mvm, sta, lq_sta, band);
2665 }
2666
2667 static void rs_fill_link_cmd(struct iwl_mvm *mvm,
2668                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2669 {
2670         struct iwl_scale_tbl_info tbl_type;
2671         int index = 0;
2672         int rate_idx;
2673         int repeat_rate = 0;
2674         u8 ant_toggle_cnt = 0;
2675         u8 use_ht_possible = 1;
2676         u8 valid_tx_ant = 0;
2677         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2678
2679         /* Override starting rate (index 0) if needed for debug purposes */
2680         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2681
2682         /* Interpret new_rate (rate_n_flags) */
2683         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2684                                  &tbl_type, &rate_idx);
2685
2686         /* How many times should we repeat the initial rate? */
2687         if (is_legacy(tbl_type.lq_type)) {
2688                 ant_toggle_cnt = 1;
2689                 repeat_rate = IWL_NUMBER_TRY;
2690         } else {
2691                 repeat_rate = min(IWL_HT_NUMBER_TRY,
2692                                   LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2693         }
2694
2695         lq_cmd->mimo_delim = is_mimo(tbl_type.lq_type) ? 1 : 0;
2696
2697         /* Fill 1st table entry (index 0) */
2698         lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2699
2700         if (num_of_ant(tbl_type.ant_type) == 1)
2701                 lq_cmd->single_stream_ant_msk = tbl_type.ant_type;
2702         else if (num_of_ant(tbl_type.ant_type) == 2)
2703                 lq_cmd->dual_stream_ant_msk = tbl_type.ant_type;
2704         /* otherwise we don't modify the existing value */
2705
2706         index++;
2707         repeat_rate--;
2708         if (mvm)
2709                 valid_tx_ant = mvm->nvm_data->valid_tx_ant;
2710
2711         /* Fill rest of rate table */
2712         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2713                 /* Repeat initial/next rate.
2714                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2715                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2716                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2717                         if (is_legacy(tbl_type.lq_type)) {
2718                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2719                                         ant_toggle_cnt++;
2720                                 else if (mvm &&
2721                                          rs_toggle_antenna(valid_tx_ant,
2722                                                         &new_rate, &tbl_type))
2723                                         ant_toggle_cnt = 1;
2724                         }
2725
2726                         /* Override next rate if needed for debug purposes */
2727                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2728
2729                         /* Fill next table entry */
2730                         lq_cmd->rs_table[index] =
2731                                         cpu_to_le32(new_rate);
2732                         repeat_rate--;
2733                         index++;
2734                 }
2735
2736                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2737                                          &rate_idx);
2738
2739
2740                 /* Indicate to uCode which entries might be MIMO.
2741                  * If initial rate was MIMO, this will finally end up
2742                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2743                 if (is_mimo(tbl_type.lq_type))
2744                         lq_cmd->mimo_delim = index;
2745
2746                 /* Get next rate */
2747                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2748                                              use_ht_possible);
2749
2750                 /* How many times should we repeat the next rate? */
2751                 if (is_legacy(tbl_type.lq_type)) {
2752                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2753                                 ant_toggle_cnt++;
2754                         else if (mvm &&
2755                                  rs_toggle_antenna(valid_tx_ant,
2756                                                    &new_rate, &tbl_type))
2757                                 ant_toggle_cnt = 1;
2758
2759                         repeat_rate = IWL_NUMBER_TRY;
2760                 } else {
2761                         repeat_rate = IWL_HT_NUMBER_TRY;
2762                 }
2763
2764                 /* Don't allow HT rates after next pass.
2765                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2766                 use_ht_possible = 0;
2767
2768                 /* Override next rate if needed for debug purposes */
2769                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2770
2771                 /* Fill next table entry */
2772                 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2773
2774                 index++;
2775                 repeat_rate--;
2776         }
2777
2778         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2779         lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2780
2781         lq_cmd->agg_time_limit =
2782                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2783 }
2784
2785 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2786 {
2787         return hw->priv;
2788 }
2789 /* rate scale requires free function to be implemented */
2790 static void rs_free(void *mvm_rate)
2791 {
2792         return;
2793 }
2794
2795 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2796                         void *mvm_sta)
2797 {
2798         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2799         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2800
2801         IWL_DEBUG_RATE(mvm, "enter\n");
2802         IWL_DEBUG_RATE(mvm, "leave\n");
2803 }
2804
2805 #ifdef CONFIG_MAC80211_DEBUGFS
2806 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2807                              u32 *rate_n_flags, int index)
2808 {
2809         struct iwl_mvm *mvm;
2810         u8 valid_tx_ant;
2811         u8 ant_sel_tx;
2812
2813         mvm = lq_sta->drv;
2814         valid_tx_ant = mvm->nvm_data->valid_tx_ant;
2815         if (lq_sta->dbg_fixed_rate) {
2816                 ant_sel_tx =
2817                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2818                   >> RATE_MCS_ANT_POS);
2819                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2820                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2821                         IWL_DEBUG_RATE(mvm, "Fixed rate ON\n");
2822                 } else {
2823                         lq_sta->dbg_fixed_rate = 0;
2824                         IWL_ERR(mvm,
2825                                 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2826                                 ant_sel_tx, valid_tx_ant);
2827                         IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2828                 }
2829         } else {
2830                 IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2831         }
2832 }
2833
2834 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2835                         const char __user *user_buf, size_t count, loff_t *ppos)
2836 {
2837         struct iwl_lq_sta *lq_sta = file->private_data;
2838         struct iwl_mvm *mvm;
2839         char buf[64];
2840         size_t buf_size;
2841         u32 parsed_rate;
2842
2843
2844         mvm = lq_sta->drv;
2845         memset(buf, 0, sizeof(buf));
2846         buf_size = min(count, sizeof(buf) -  1);
2847         if (copy_from_user(buf, user_buf, buf_size))
2848                 return -EFAULT;
2849
2850         if (sscanf(buf, "%x", &parsed_rate) == 1)
2851                 lq_sta->dbg_fixed_rate = parsed_rate;
2852         else
2853                 lq_sta->dbg_fixed_rate = 0;
2854
2855         rs_program_fix_rate(mvm, lq_sta);
2856
2857         return count;
2858 }
2859
2860 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2861                         char __user *user_buf, size_t count, loff_t *ppos)
2862 {
2863         char *buff;
2864         int desc = 0;
2865         int i = 0;
2866         int index = 0;
2867         ssize_t ret;
2868
2869         struct iwl_lq_sta *lq_sta = file->private_data;
2870         struct iwl_mvm *mvm;
2871         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2872
2873         mvm = lq_sta->drv;
2874         buff = kmalloc(1024, GFP_KERNEL);
2875         if (!buff)
2876                 return -ENOMEM;
2877
2878         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2879         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2880                         lq_sta->total_failed, lq_sta->total_success,
2881                         lq_sta->active_legacy_rate);
2882         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2883                         lq_sta->dbg_fixed_rate);
2884         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2885             (mvm->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "",
2886             (mvm->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "",
2887             (mvm->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : "");
2888         desc += sprintf(buff+desc, "lq type %s\n",
2889            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2890         if (is_Ht(tbl->lq_type)) {
2891                 desc += sprintf(buff+desc, " %s",
2892                    (is_siso(tbl->lq_type)) ? "SISO" :
2893                    ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2894                    desc += sprintf(buff+desc, " %s",
2895                    (tbl->is_ht40) ? "40MHz" : "20MHz");
2896                    desc += sprintf(buff+desc, " %s %s %s\n",
2897                                    (tbl->is_SGI) ? "SGI" : "",
2898                    (lq_sta->is_green) ? "GF enabled" : "",
2899                    (lq_sta->is_agg) ? "AGG on" : "");
2900         }
2901         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2902                         lq_sta->last_rate_n_flags);
2903         desc += sprintf(buff+desc,
2904                         "general: flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2905                         lq_sta->lq.flags,
2906                         lq_sta->lq.mimo_delim,
2907                         lq_sta->lq.single_stream_ant_msk,
2908                         lq_sta->lq.dual_stream_ant_msk);
2909
2910         desc += sprintf(buff+desc,
2911                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2912                         le16_to_cpu(lq_sta->lq.agg_time_limit),
2913                         lq_sta->lq.agg_disable_start_th,
2914                         lq_sta->lq.agg_frame_cnt_limit);
2915
2916         desc += sprintf(buff+desc,
2917                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2918                         lq_sta->lq.initial_rate_index[0],
2919                         lq_sta->lq.initial_rate_index[1],
2920                         lq_sta->lq.initial_rate_index[2],
2921                         lq_sta->lq.initial_rate_index[3]);
2922
2923         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2924                 index = iwl_hwrate_to_plcp_idx(
2925                         le32_to_cpu(lq_sta->lq.rs_table[i]));
2926                 if (is_legacy(tbl->lq_type)) {
2927                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2928                                         i, le32_to_cpu(lq_sta->lq.rs_table[i]),
2929                                         iwl_rate_mcs[index].mbps);
2930                 } else {
2931                         desc += sprintf(buff+desc,
2932                                         " rate[%d] 0x%X %smbps (%s)\n",
2933                                         i, le32_to_cpu(lq_sta->lq.rs_table[i]),
2934                                         iwl_rate_mcs[index].mbps,
2935                                         iwl_rate_mcs[index].mcs);
2936                 }
2937         }
2938
2939         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2940         kfree(buff);
2941         return ret;
2942 }
2943
2944 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2945         .write = rs_sta_dbgfs_scale_table_write,
2946         .read = rs_sta_dbgfs_scale_table_read,
2947         .open = simple_open,
2948         .llseek = default_llseek,
2949 };
2950 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2951                         char __user *user_buf, size_t count, loff_t *ppos)
2952 {
2953         char *buff;
2954         int desc = 0;
2955         int i, j;
2956         ssize_t ret;
2957
2958         struct iwl_lq_sta *lq_sta = file->private_data;
2959
2960         buff = kmalloc(1024, GFP_KERNEL);
2961         if (!buff)
2962                 return -ENOMEM;
2963
2964         for (i = 0; i < LQ_SIZE; i++) {
2965                 desc += sprintf(buff+desc,
2966                                 "%s type=%d SGI=%d HT40=%d DUP=0 GF=%d\n"
2967                                 "rate=0x%X\n",
2968                                 lq_sta->active_tbl == i ? "*" : "x",
2969                                 lq_sta->lq_info[i].lq_type,
2970                                 lq_sta->lq_info[i].is_SGI,
2971                                 lq_sta->lq_info[i].is_ht40,
2972                                 lq_sta->is_green,
2973                                 lq_sta->lq_info[i].current_rate);
2974                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2975                         desc += sprintf(buff+desc,
2976                                 "counter=%d success=%d %%=%d\n",
2977                                 lq_sta->lq_info[i].win[j].counter,
2978                                 lq_sta->lq_info[i].win[j].success_counter,
2979                                 lq_sta->lq_info[i].win[j].success_ratio);
2980                 }
2981         }
2982         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2983         kfree(buff);
2984         return ret;
2985 }
2986
2987 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2988         .read = rs_sta_dbgfs_stats_table_read,
2989         .open = simple_open,
2990         .llseek = default_llseek,
2991 };
2992
2993 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2994                         char __user *user_buf, size_t count, loff_t *ppos)
2995 {
2996         struct iwl_lq_sta *lq_sta = file->private_data;
2997         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2998         char buff[120];
2999         int desc = 0;
3000
3001         if (is_Ht(tbl->lq_type))
3002                 desc += sprintf(buff+desc,
3003                                 "Bit Rate= %d Mb/s\n",
3004                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3005         else
3006                 desc += sprintf(buff+desc,
3007                                 "Bit Rate= %d Mb/s\n",
3008                                 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3009
3010         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3011 }
3012
3013 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3014         .read = rs_sta_dbgfs_rate_scale_data_read,
3015         .open = simple_open,
3016         .llseek = default_llseek,
3017 };
3018
3019 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3020 {
3021         struct iwl_lq_sta *lq_sta = mvm_sta;
3022         lq_sta->rs_sta_dbgfs_scale_table_file =
3023                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3024                                     lq_sta, &rs_sta_dbgfs_scale_table_ops);
3025         lq_sta->rs_sta_dbgfs_stats_table_file =
3026                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3027                                     lq_sta, &rs_sta_dbgfs_stats_table_ops);
3028         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3029                 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3030                                     lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3031         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3032                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3033                                   &lq_sta->tx_agg_tid_en);
3034 }
3035
3036 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3037 {
3038         struct iwl_lq_sta *lq_sta = mvm_sta;
3039         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3040         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3041         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3042         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3043 }
3044 #endif
3045
3046 /*
3047  * Initialization of rate scaling information is done by driver after
3048  * the station is added. Since mac80211 calls this function before a
3049  * station is added we ignore it.
3050  */
3051 static void rs_rate_init_stub(void *mvm_r,
3052                                  struct ieee80211_supported_band *sband,
3053                                  struct ieee80211_sta *sta, void *mvm_sta)
3054 {
3055 }
3056 static struct rate_control_ops rs_mvm_ops = {
3057         .module = NULL,
3058         .name = RS_NAME,
3059         .tx_status = rs_tx_status,
3060         .get_rate = rs_get_rate,
3061         .rate_init = rs_rate_init_stub,
3062         .alloc = rs_alloc,
3063         .free = rs_free,
3064         .alloc_sta = rs_alloc_sta,
3065         .free_sta = rs_free_sta,
3066 #ifdef CONFIG_MAC80211_DEBUGFS
3067         .add_sta_debugfs = rs_add_debugfs,
3068         .remove_sta_debugfs = rs_remove_debugfs,
3069 #endif
3070 };
3071
3072 int iwl_mvm_rate_control_register(void)
3073 {
3074         return ieee80211_rate_control_register(&rs_mvm_ops);
3075 }
3076
3077 void iwl_mvm_rate_control_unregister(void)
3078 {
3079         ieee80211_rate_control_unregister(&rs_mvm_ops);
3080 }