Pileus Git - ~andy/linux/blob - drivers/net/wireless/iwlwifi/mvm/rs.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2013 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/slab.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37 #include "rs.h"
  38 #include "fw-api.h"
  39 #include "sta.h"
  40 #include "iwl-op-mode.h"
  41 #include "mvm.h"
  42
  43 #define RS_NAME "iwl-mvm-rs"
  44
  45 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  46 #define IWL_NUMBER_TRY      1
  47 #define IWL_HT_NUMBER_TRY   3
  48
  49 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  50 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  51 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  52
  53 /* max allowed rate miss before sync LQ cmd */
  54 #define IWL_MISSED_RATE_MAX             15
  55 /* max time to accum history 2 seconds */
  56 #define IWL_RATE_SCALE_FLUSH_INTVL   (3*HZ)
  57
  58 static u8 rs_ht_to_legacy[] = {
  59         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  60         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  61         IWL_RATE_6M_INDEX,
  62         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  63         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  64         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  65         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  66 };
  67
  68 static const u8 ant_toggle_lookup[] = {
  69         /*ANT_NONE -> */ ANT_NONE,
  70         /*ANT_A    -> */ ANT_B,
  71         /*ANT_B    -> */ ANT_C,
  72         /*ANT_AB   -> */ ANT_BC,
  73         /*ANT_C    -> */ ANT_A,
  74         /*ANT_AC   -> */ ANT_AB,
  75         /*ANT_BC   -> */ ANT_AC,
  76         /*ANT_ABC  -> */ ANT_ABC,
  77 };
  78
  79 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
  80         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
  81                                     IWL_RATE_SISO_##s##M_PLCP, \
  82                                     IWL_RATE_MIMO2_##s##M_PLCP,\
  83                                     IWL_RATE_MIMO3_##s##M_PLCP,\
  84                                     IWL_RATE_##r##M_IEEE,      \
  85                                     IWL_RATE_##ip##M_INDEX,    \
  86                                     IWL_RATE_##in##M_INDEX,    \
  87                                     IWL_RATE_##rp##M_INDEX,    \
  88                                     IWL_RATE_##rn##M_INDEX,    \
  89                                     IWL_RATE_##pp##M_INDEX,    \
  90                                     IWL_RATE_##np##M_INDEX }
  91
  92 /*
  93  * Parameter order:
  94  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
  95  *
  96  * If there isn't a valid next or previous rate then INV is used which
  97  * maps to IWL_RATE_INVALID
  98  *
  99  */
 100 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 101         IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),    /*  1mbps */
 102         IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
 103         IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
 104         IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
 105         IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
 106         IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
 107         IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
 108         IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
 109         IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
 110         IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
 111         IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
 112         IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
 113         IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
 114         /* FIXME:RS:          ^^    should be INV (legacy) */
 115 };
 116
 117 static inline u8 rs_extract_rate(u32 rate_n_flags)
 118 {
 119         /* also works for HT because bits 7:6 are zero there */
 120         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 121 }
 122
 123 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 124 {
 125         int idx = 0;
 126
 127         /* HT rate format */
 128         if (rate_n_flags & RATE_MCS_HT_MSK) {
 129                 idx = rs_extract_rate(rate_n_flags);
 130
 131                 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
 132                         idx = idx - IWL_RATE_MIMO3_6M_PLCP;
 133                 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
 134                         idx = idx - IWL_RATE_MIMO2_6M_PLCP;
 135
 136                 idx += IWL_FIRST_OFDM_RATE;
 137                 /* skip 9M not supported in ht*/
 138                 if (idx >= IWL_RATE_9M_INDEX)
 139                         idx += 1;
 140                 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
 141                         return idx;
 142
 143         /* legacy rate format, search for match in table */
 144         } else {
 145                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 146                         if (iwl_rates[idx].plcp ==
 147                                         rs_extract_rate(rate_n_flags))
 148                                 return idx;
 149         }
 150
 151         return -1;
 152 }
 153
 154 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 155                                    struct sk_buff *skb,
 156                                    struct ieee80211_sta *sta,
 157                                    struct iwl_lq_sta *lq_sta);
 158 static void rs_fill_link_cmd(struct iwl_mvm *mvm,
 159                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 160 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 161
 162
 163 #ifdef CONFIG_MAC80211_DEBUGFS
 164 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 165                              u32 *rate_n_flags, int index);
 166 #else
 167 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 168                              u32 *rate_n_flags, int index)
 169 {}
 170 #endif
 171
 172 /**
 173  * The following tables contain the expected throughput metrics for all rates
 174  *
 175  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 176  *
 177  * where invalid entries are zeros.
 178  *
 179  * CCK rates are only valid in legacy table and will only be used in G
 180  * (2.4 GHz) band.
 181  */
 182
 183 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
 184         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 185 };
 186
 187 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
 188         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202}, /* Norm */
 189         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210}, /* SGI */
 190         {0, 0, 0, 0, 47, 0,  91, 133, 171, 242, 305, 334, 362}, /* AGG */
 191         {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
 192 };
 193
 194 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
 195         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 196         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 197         {0, 0, 0, 0,  94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
 198         {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
 199 };
 200
 201 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 202         {0, 0, 0, 0,  74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
 203         {0, 0, 0, 0,  81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
 204         {0, 0, 0, 0,  89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
 205         {0, 0, 0, 0,  97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
 206 };
 207
 208 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 209         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
 210         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
 211         {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
 212         {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
 213 };
 214
 215 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
 216         {0, 0, 0, 0,  99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
 217         {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
 218         {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
 219         {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
 220 };
 221
 222 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
 223         {0, 0, 0, 0, 152, 0, 211, 239, 255, 279,  290,  294,  297}, /* Norm */
 224         {0, 0, 0, 0, 160, 0, 219, 245, 261, 284,  294,  297,  300}, /* SGI */
 225         {0, 0, 0, 0, 254, 0, 443, 584, 695, 868,  984, 1030, 1070}, /* AGG */
 226         {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
 227 };
 228
 229 /* mbps, mcs */
 230 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 231         {  "1", "BPSK DSSS"},
 232         {  "2", "QPSK DSSS"},
 233         {"5.5", "BPSK CCK"},
 234         { "11", "QPSK CCK"},
 235         {  "6", "BPSK 1/2"},
 236         {  "9", "BPSK 1/2"},
 237         { "12", "QPSK 1/2"},
 238         { "18", "QPSK 3/4"},
 239         { "24", "16QAM 1/2"},
 240         { "36", "16QAM 3/4"},
 241         { "48", "64QAM 2/3"},
 242         { "54", "64QAM 3/4"},
 243         { "60", "64QAM 5/6"},
 244 };
 245
 246 #define MCS_INDEX_PER_STREAM    (8)
 247
 248 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 249 {
 250         window->data = 0;
 251         window->success_counter = 0;
 252         window->success_ratio = IWL_INVALID_VALUE;
 253         window->counter = 0;
 254         window->average_tpt = IWL_INVALID_VALUE;
 255         window->stamp = 0;
 256 }
 257
 258 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 259 {
 260         return (ant_type & valid_antenna) == ant_type;
 261 }
 262
 263 /*
 264  *      removes the old data from the statistics. All data that is older than
 265  *      TID_MAX_TIME_DIFF, will be deleted.
 266  */
 267 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 268 {
 269         /* The oldest age we want to keep */
 270         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 271
 272         while (tl->queue_count &&
 273                (tl->time_stamp < oldest_time)) {
 274                 tl->total -= tl->packet_count[tl->head];
 275                 tl->packet_count[tl->head] = 0;
 276                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 277                 tl->queue_count--;
 278                 tl->head++;
 279                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 280                         tl->head = 0;
 281         }
 282 }
 283
 284 /*
 285  *      increment traffic load value for tid and also remove
 286  *      any old values if passed the certain time period
 287  */
 288 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 289                            struct ieee80211_hdr *hdr)
 290 {
 291         u32 curr_time = jiffies_to_msecs(jiffies);
 292         u32 time_diff;
 293         s32 index;
 294         struct iwl_traffic_load *tl = NULL;
 295         u8 tid;
 296
 297         if (ieee80211_is_data_qos(hdr->frame_control)) {
 298                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 299                 tid = qc[0] & 0xf;
 300         } else {
 301                 return IWL_MAX_TID_COUNT;
 302         }
 303
 304         if (unlikely(tid >= IWL_MAX_TID_COUNT))
 305                 return IWL_MAX_TID_COUNT;
 306
 307         tl = &lq_data->load[tid];
 308
 309         curr_time -= curr_time % TID_ROUND_VALUE;
 310
 311         /* Happens only for the first packet. Initialize the data */
 312         if (!(tl->queue_count)) {
 313                 tl->total = 1;
 314                 tl->time_stamp = curr_time;
 315                 tl->queue_count = 1;
 316                 tl->head = 0;
 317                 tl->packet_count[0] = 1;
 318                 return IWL_MAX_TID_COUNT;
 319         }
 320
 321         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 322         index = time_diff / TID_QUEUE_CELL_SPACING;
 323
 324         /* The history is too long: remove data that is older than */
 325         /* TID_MAX_TIME_DIFF */
 326         if (index >= TID_QUEUE_MAX_SIZE)
 327                 rs_tl_rm_old_stats(tl, curr_time);
 328
 329         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 330         tl->packet_count[index] = tl->packet_count[index] + 1;
 331         tl->total = tl->total + 1;
 332
 333         if ((index + 1) > tl->queue_count)
 334                 tl->queue_count = index + 1;
 335
 336         return tid;
 337 }
 338
 339 #ifdef CONFIG_MAC80211_DEBUGFS
 340 /**
 341  * Program the device to use fixed rate for frame transmit
 342  * This is for debugging/testing only
 343  * once the device start use fixed rate, we need to reload the module
 344  * to being back the normal operation.
 345  */
 346 static void rs_program_fix_rate(struct iwl_mvm *mvm,
 347                                 struct iwl_lq_sta *lq_sta)
 348 {
 349         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
 350         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 351         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 352         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 353
 354         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
 355                        lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
 356
 357         if (lq_sta->dbg_fixed_rate) {
 358                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
 359                 iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
 360         }
 361 }
 362 #endif
 363
 364 /*
 365         get the traffic load value for tid
 366 */
 367 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 368 {
 369         u32 curr_time = jiffies_to_msecs(jiffies);
 370         u32 time_diff;
 371         s32 index;
 372         struct iwl_traffic_load *tl = NULL;
 373
 374         if (tid >= IWL_MAX_TID_COUNT)
 375                 return 0;
 376
 377         tl = &(lq_data->load[tid]);
 378
 379         curr_time -= curr_time % TID_ROUND_VALUE;
 380
 381         if (!(tl->queue_count))
 382                 return 0;
 383
 384         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 385         index = time_diff / TID_QUEUE_CELL_SPACING;
 386
 387         /* The history is too long: remove data that is older than */
 388         /* TID_MAX_TIME_DIFF */
 389         if (index >= TID_QUEUE_MAX_SIZE)
 390                 rs_tl_rm_old_stats(tl, curr_time);
 391
 392         return tl->total;
 393 }
 394
 395 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 396                                       struct iwl_lq_sta *lq_data, u8 tid,
 397                                       struct ieee80211_sta *sta)
 398 {
 399         int ret = -EAGAIN;
 400         u32 load;
 401
 402         load = rs_tl_get_load(lq_data, tid);
 403
 404         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         /*
 684          * There's a bug somewhere in this code that causes the
 685          * scaling to get stuck because GF+SGI can't be combined
 686          * in SISO rates. Until we find that bug, disable GF, it
 687          * has only limited benefit and we still interoperate with
 688          * GF APs since we can always receive GF transmissions.
 689          */
 690         return false;
 691 }
 692
 693 /**
 694  * rs_get_supported_rates - get the available rates
 695  *
 696  * if management frame or broadcast frame only return
 697  * basic available rates.
 698  *
 699  */
 700 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 701                                   struct ieee80211_hdr *hdr,
 702                                   enum iwl_table_type rate_type)
 703 {
 704         if (is_legacy(rate_type)) {
 705                 return lq_sta->active_legacy_rate;
 706         } else {
 707                 if (is_siso(rate_type))
 708                         return lq_sta->active_siso_rate;
 709                 else if (is_mimo2(rate_type))
 710                         return lq_sta->active_mimo2_rate;
 711                 else
 712                         return lq_sta->active_mimo3_rate;
 713         }
 714 }
 715
 716 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 717                                 int rate_type)
 718 {
 719         u8 high = IWL_RATE_INVALID;
 720         u8 low = IWL_RATE_INVALID;
 721
 722         /* 802.11A or ht walks to the next literal adjacent rate in
 723          * the rate table */
 724         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 725                 int i;
 726                 u32 mask;
 727
 728                 /* Find the previous rate that is in the rate mask */
 729                 i = index - 1;
 730                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 731                         if (rate_mask & mask) {
 732                                 low = i;
 733                                 break;
 734                         }
 735                 }
 736
 737                 /* Find the next rate that is in the rate mask */
 738                 i = index + 1;
 739                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 740                         if (rate_mask & mask) {
 741                                 high = i;
 742                                 break;
 743                         }
 744                 }
 745
 746                 return (high << 8) | low;
 747         }
 748
 749         low = index;
 750         while (low != IWL_RATE_INVALID) {
 751                 low = iwl_rates[low].prev_rs;
 752                 if (low == IWL_RATE_INVALID)
 753                         break;
 754                 if (rate_mask & (1 << low))
 755                         break;
 756                 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
 757         }
 758
 759         high = index;
 760         while (high != IWL_RATE_INVALID) {
 761                 high = iwl_rates[high].next_rs;
 762                 if (high == IWL_RATE_INVALID)
 763                         break;
 764                 if (rate_mask & (1 << high))
 765                         break;
 766                 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
 767         }
 768
 769         return (high << 8) | low;
 770 }
 771
 772 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 773                              struct iwl_scale_tbl_info *tbl,
 774                              u8 scale_index, u8 ht_possible)
 775 {
 776         s32 low;
 777         u16 rate_mask;
 778         u16 high_low;
 779         u8 switch_to_legacy = 0;
 780         u8 is_green = lq_sta->is_green;
 781         struct iwl_mvm *mvm = lq_sta->drv;
 782
 783         /* check if we need to switch from HT to legacy rates.
 784          * assumption is that mandatory rates (1Mbps or 6Mbps)
 785          * are always supported (spec demand) */
 786         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 787                 switch_to_legacy = 1;
 788                 scale_index = rs_ht_to_legacy[scale_index];
 789                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 790                         tbl->lq_type = LQ_A;
 791                 else
 792                         tbl->lq_type = LQ_G;
 793
 794                 if (num_of_ant(tbl->ant_type) > 1)
 795                         tbl->ant_type =
 796                             first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
 797
 798                 tbl->is_ht40 = 0;
 799                 tbl->is_SGI = 0;
 800                 tbl->max_search = IWL_MAX_SEARCH;
 801         }
 802
 803         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 804
 805         /* Mask with station rate restriction */
 806         if (is_legacy(tbl->lq_type)) {
 807                 /* supp_rates has no CCK bits in A mode */
 808                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 809                         rate_mask  = (u16)(rate_mask &
 810                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 811                 else
 812                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 813         }
 814
 815         /* If we switched from HT to legacy, check current rate */
 816         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 817                 low = scale_index;
 818                 goto out;
 819         }
 820
 821         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 822                                         tbl->lq_type);
 823         low = high_low & 0xff;
 824
 825         if (low == IWL_RATE_INVALID)
 826                 low = scale_index;
 827
 828 out:
 829         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 830 }
 831
 832 /*
 833  * Simple function to compare two rate scale table types
 834  */
 835 static bool table_type_matches(struct iwl_scale_tbl_info *a,
 836                                struct iwl_scale_tbl_info *b)
 837 {
 838         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 839                 (a->is_SGI == b->is_SGI);
 840 }
 841
 842 /*
 843  * mac80211 sends us Tx status
 844  */
 845 static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
 846                          struct ieee80211_sta *sta, void *priv_sta,
 847                          struct sk_buff *skb)
 848 {
 849         int legacy_success;
 850         int retries;
 851         int rs_index, mac_index, i;
 852         struct iwl_lq_sta *lq_sta = priv_sta;
 853         struct iwl_lq_cmd *table;
 854         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 855         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
 856         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 857         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 858         enum mac80211_rate_control_flags mac_flags;
 859         u32 tx_rate;
 860         struct iwl_scale_tbl_info tbl_type;
 861         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 862
 863         IWL_DEBUG_RATE_LIMIT(mvm,
 864                              "get frame ack response, update rate scale window\n");
 865
 866         /* Treat uninitialized rate scaling data same as non-existing. */
 867         if (!lq_sta) {
 868                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
 869                 return;
 870         } else if (!lq_sta->drv) {
 871                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
 872                 return;
 873         }
 874
 875         if (!ieee80211_is_data(hdr->frame_control) ||
 876             info->flags & IEEE80211_TX_CTL_NO_ACK)
 877                 return;
 878
 879         /* This packet was aggregated but doesn't carry status info */
 880         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 881             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 882                 return;
 883
 884         /*
 885          * Ignore this Tx frame response if its initial rate doesn't match
 886          * that of latest Link Quality command.  There may be stragglers
 887          * from a previous Link Quality command, but we're no longer interested
 888          * in those; they're either from the "active" mode while we're trying
 889          * to check "search" mode, or a prior "search" mode after we've moved
 890          * to a new "search" mode (which might become the new "active" mode).
 891          */
 892         table = &lq_sta->lq;
 893         tx_rate = le32_to_cpu(table->rs_table[0]);
 894         rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type, &rs_index);
 895         if (info->band == IEEE80211_BAND_5GHZ)
 896                 rs_index -= IWL_FIRST_OFDM_RATE;
 897         mac_flags = info->status.rates[0].flags;
 898         mac_index = info->status.rates[0].idx;
 899         /* For HT packets, map MCS to PLCP */
 900         if (mac_flags & IEEE80211_TX_RC_MCS) {
 901                 /* Remove # of streams */
 902                 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
 903                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 904                         mac_index++;
 905                 /*
 906                  * mac80211 HT index is always zero-indexed; we need to move
 907                  * HT OFDM rates after CCK rates in 2.4 GHz band
 908                  */
 909                 if (info->band == IEEE80211_BAND_2GHZ)
 910                         mac_index += IWL_FIRST_OFDM_RATE;
 911         }
 912         /* Here we actually compare this rate to the latest LQ command */
 913         if ((mac_index < 0) ||
 914             (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 915             (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 916             (tbl_type.ant_type != info->status.antenna) ||
 917             (!!(tx_rate & RATE_MCS_HT_MSK) !=
 918                                 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 919             (!!(tx_rate & RATE_HT_MCS_GF_MSK) !=
 920                                 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 921             (rs_index != mac_index)) {
 922                 IWL_DEBUG_RATE(mvm,
 923                                "initial rate %d does not match %d (0x%x)\n",
 924                                mac_index, rs_index, tx_rate);
 925                 /*
 926                  * Since rates mis-match, the last LQ command may have failed.
 927                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 928                  * ... driver.
 929                  */
 930                 lq_sta->missed_rate_counter++;
 931                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 932                         lq_sta->missed_rate_counter = 0;
 933                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
 934                 }
 935                 /* Regardless, ignore this status info for outdated rate */
 936                 return;
 937         } else
 938                 /* Rate did match, so reset the missed_rate_counter */
 939                 lq_sta->missed_rate_counter = 0;
 940
 941         /* Figure out if rate scale algorithm is in active or search table */
 942         if (table_type_matches(&tbl_type,
 943                                &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 944                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 945                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 946         } else if (table_type_matches(
 947                         &tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
 948                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 949                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 950         } else {
 951                 IWL_DEBUG_RATE(mvm,
 952                                "Neither active nor search matches tx rate\n");
 953                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 954                 IWL_DEBUG_RATE(mvm, "active- lq:%x, ant:%x, SGI:%d\n",
 955                                tmp_tbl->lq_type, tmp_tbl->ant_type,
 956                                tmp_tbl->is_SGI);
 957                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 958                 IWL_DEBUG_RATE(mvm, "search- lq:%x, ant:%x, SGI:%d\n",
 959                                tmp_tbl->lq_type, tmp_tbl->ant_type,
 960                                tmp_tbl->is_SGI);
 961                 IWL_DEBUG_RATE(mvm, "actual- lq:%x, ant:%x, SGI:%d\n",
 962                                tbl_type.lq_type, tbl_type.ant_type,
 963                                tbl_type.is_SGI);
 964                 /*
 965                  * no matching table found, let's by-pass the data collection
 966                  * and continue to perform rate scale to find the rate table
 967                  */
 968                 rs_stay_in_table(lq_sta, true);
 969                 goto done;
 970         }
 971
 972         /*
 973          * Updating the frame history depends on whether packets were
 974          * aggregated.
 975          *
 976          * For aggregation, all packets were transmitted at the same rate, the
 977          * first index into rate scale table.
 978          */
 979         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
 980                 tx_rate = le32_to_cpu(table->rs_table[0]);
 981                 rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type,
 982                                          &rs_index);
 983                 rs_collect_tx_data(curr_tbl, rs_index,
 984                                    info->status.ampdu_len,
 985                                    info->status.ampdu_ack_len);
 986
 987                 /* Update success/fail counts if not searching for new mode */
 988                 if (lq_sta->stay_in_tbl) {
 989                         lq_sta->total_success += info->status.ampdu_ack_len;
 990                         lq_sta->total_failed += (info->status.ampdu_len -
 991                                         info->status.ampdu_ack_len);
 992                 }
 993         } else {
 994         /*
 995          * For legacy, update frame history with for each Tx retry.
 996          */
 997                 retries = info->status.rates[0].count - 1;
 998                 /* HW doesn't send more than 15 retries */
 999                 retries = min(retries, 15);
1000
1001                 /* The last transmission may have been successful */
1002                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1003                 /* Collect data for each rate used during failed TX attempts */
1004                 for (i = 0; i <= retries; ++i) {
1005                         tx_rate = le32_to_cpu(table->rs_table[i]);
1006                         rs_get_tbl_info_from_mcs(tx_rate, info->band,
1007                                                  &tbl_type, &rs_index);
1008                         /*
1009                          * Only collect stats if retried rate is in the same RS
1010                          * table as active/search.
1011                          */
1012                         if (table_type_matches(&tbl_type, curr_tbl))
1013                                 tmp_tbl = curr_tbl;
1014                         else if (table_type_matches(&tbl_type, other_tbl))
1015                                 tmp_tbl = other_tbl;
1016                         else
1017                                 continue;
1018                         rs_collect_tx_data(tmp_tbl, rs_index, 1,
1019                                            i < retries ? 0 : legacy_success);
1020                 }
1021
1022                 /* Update success/fail counts if not searching for new mode */
1023                 if (lq_sta->stay_in_tbl) {
1024                         lq_sta->total_success += legacy_success;
1025                         lq_sta->total_failed += retries + (1 - legacy_success);
1026                 }
1027         }
1028         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1029         lq_sta->last_rate_n_flags = tx_rate;
1030 done:
1031         /* See if there's a better rate or modulation mode to try. */
1032         if (sta && sta->supp_rates[sband->band])
1033                 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
1034 }
1035
1036 /*
1037  * Begin a period of staying with a selected modulation mode.
1038  * Set "stay_in_tbl" flag to prevent any mode switches.
1039  * Set frame tx success limits according to legacy vs. high-throughput,
1040  * and reset overall (spanning all rates) tx success history statistics.
1041  * These control how long we stay using same modulation mode before
1042  * searching for a new mode.
1043  */
1044 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1045                                  struct iwl_lq_sta *lq_sta)
1046 {
1047         IWL_DEBUG_RATE(mvm, "we are staying in the same table\n");
1048         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1049         if (is_legacy) {
1050                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1051                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1052                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1053         } else {
1054                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1055                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1056                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1057         }
1058         lq_sta->table_count = 0;
1059         lq_sta->total_failed = 0;
1060         lq_sta->total_success = 0;
1061         lq_sta->flush_timer = jiffies;
1062         lq_sta->action_counter = 0;
1063 }
1064
1065 /*
1066  * Find correct throughput table for given mode of modulation
1067  */
1068 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1069                                       struct iwl_scale_tbl_info *tbl)
1070 {
1071         /* Used to choose among HT tables */
1072         s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1073
1074         /* Check for invalid LQ type */
1075         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1076                 tbl->expected_tpt = expected_tpt_legacy;
1077                 return;
1078         }
1079
1080         /* Legacy rates have only one table */
1081         if (is_legacy(tbl->lq_type)) {
1082                 tbl->expected_tpt = expected_tpt_legacy;
1083                 return;
1084         }
1085
1086         /* Choose among many HT tables depending on number of streams
1087          * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1088          * status */
1089         if (is_siso(tbl->lq_type) && !tbl->is_ht40)
1090                 ht_tbl_pointer = expected_tpt_siso20MHz;
1091         else if (is_siso(tbl->lq_type))
1092                 ht_tbl_pointer = expected_tpt_siso40MHz;
1093         else if (is_mimo2(tbl->lq_type) && !tbl->is_ht40)
1094                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1095         else if (is_mimo2(tbl->lq_type))
1096                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1097         else if (is_mimo3(tbl->lq_type) && !tbl->is_ht40)
1098                 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1099         else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1100                 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1101
1102         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
1103                 tbl->expected_tpt = ht_tbl_pointer[0];
1104         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1105                 tbl->expected_tpt = ht_tbl_pointer[1];
1106         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1107                 tbl->expected_tpt = ht_tbl_pointer[2];
1108         else                                            /* AGG+SGI */
1109                 tbl->expected_tpt = ht_tbl_pointer[3];
1110 }
1111
1112 /*
1113  * Find starting rate for new "search" high-throughput mode of modulation.
1114  * Goal is to find lowest expected rate (under perfect conditions) that is
1115  * above the current measured throughput of "active" mode, to give new mode
1116  * a fair chance to prove itself without too many challenges.
1117  *
1118  * This gets called when transitioning to more aggressive modulation
1119  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1120  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1121  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1122  * bit rate will typically need to increase, but not if performance was bad.
1123  */
1124 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1125                             struct iwl_lq_sta *lq_sta,
1126                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1127                             u16 rate_mask, s8 index)
1128 {
1129         /* "active" values */
1130         struct iwl_scale_tbl_info *active_tbl =
1131             &(lq_sta->lq_info[lq_sta->active_tbl]);
1132         s32 active_sr = active_tbl->win[index].success_ratio;
1133         s32 active_tpt = active_tbl->expected_tpt[index];
1134
1135         /* expected "search" throughput */
1136         s32 *tpt_tbl = tbl->expected_tpt;
1137
1138         s32 new_rate, high, low, start_hi;
1139         u16 high_low;
1140         s8 rate = index;
1141
1142         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1143
1144         while (1) {
1145                 high_low = rs_get_adjacent_rate(mvm, rate, rate_mask,
1146                                                 tbl->lq_type);
1147
1148                 low = high_low & 0xff;
1149                 high = (high_low >> 8) & 0xff;
1150
1151                 /*
1152                  * Lower the "search" bit rate, to give new "search" mode
1153                  * approximately the same throughput as "active" if:
1154                  *
1155                  * 1) "Active" mode has been working modestly well (but not
1156                  *    great), and expected "search" throughput (under perfect
1157                  *    conditions) at candidate rate is above the actual
1158                  *    measured "active" throughput (but less than expected
1159                  *    "active" throughput under perfect conditions).
1160                  * OR
1161                  * 2) "Active" mode has been working perfectly or very well
1162                  *    and expected "search" throughput (under perfect
1163                  *    conditions) at candidate rate is above expected
1164                  *    "active" throughput (under perfect conditions).
1165                  */
1166                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1167                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1168                       (active_sr <= IWL_RATE_HIGH_TH) &&
1169                       (tpt_tbl[rate] <= active_tpt))) ||
1170                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1171                      (tpt_tbl[rate] > active_tpt))) {
1172                         /* (2nd or later pass)
1173                          * If we've already tried to raise the rate, and are
1174                          * now trying to lower it, use the higher rate. */
1175                         if (start_hi != IWL_RATE_INVALID) {
1176                                 new_rate = start_hi;
1177                                 break;
1178                         }
1179
1180                         new_rate = rate;
1181
1182                         /* Loop again with lower rate */
1183                         if (low != IWL_RATE_INVALID)
1184                                 rate = low;
1185
1186                         /* Lower rate not available, use the original */
1187                         else
1188                                 break;
1189
1190                 /* Else try to raise the "search" rate to match "active" */
1191                 } else {
1192                         /* (2nd or later pass)
1193                          * If we've already tried to lower the rate, and are
1194                          * now trying to raise it, use the lower rate. */
1195                         if (new_rate != IWL_RATE_INVALID)
1196                                 break;
1197
1198                         /* Loop again with higher rate */
1199                         else if (high != IWL_RATE_INVALID) {
1200                                 start_hi = high;
1201                                 rate = high;
1202
1203                         /* Higher rate not available, use the original */
1204                         } else {
1205                                 new_rate = rate;
1206                                 break;
1207                         }
1208                 }
1209         }
1210
1211         return new_rate;
1212 }
1213
1214 static bool iwl_is_ht40_tx_allowed(struct ieee80211_sta *sta)
1215 {
1216         return sta->bandwidth >= IEEE80211_STA_RX_BW_40;
1217 }
1218
1219 /*
1220  * Set up search table for MIMO2
1221  */
1222 static int rs_switch_to_mimo2(struct iwl_mvm *mvm,
1223                              struct iwl_lq_sta *lq_sta,
1224                              struct ieee80211_sta *sta,
1225                              struct iwl_scale_tbl_info *tbl, int index)
1226 {
1227         u16 rate_mask;
1228         s32 rate;
1229         s8 is_green = lq_sta->is_green;
1230
1231         if (!sta->ht_cap.ht_supported)
1232                 return -1;
1233
1234         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1235                 return -1;
1236
1237         /* Need both Tx chains/antennas to support MIMO */
1238         if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) < 2)
1239                 return -1;
1240
1241         IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO2\n");
1242
1243         tbl->lq_type = LQ_MIMO2;
1244         tbl->action = 0;
1245         tbl->max_search = IWL_MAX_SEARCH;
1246         rate_mask = lq_sta->active_mimo2_rate;
1247
1248         if (iwl_is_ht40_tx_allowed(sta))
1249                 tbl->is_ht40 = 1;
1250         else
1251                 tbl->is_ht40 = 0;
1252
1253         rs_set_expected_tpt_table(lq_sta, tbl);
1254
1255         rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1256
1257         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 best rate %d mask %X\n",
1258                        rate, rate_mask);
1259         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1260                 IWL_DEBUG_RATE(mvm, "Can't switch with index %d rate mask %x\n",
1261                                rate, rate_mask);
1262                 return -1;
1263         }
1264         tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green);
1265
1266         IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n",
1267                        tbl->current_rate, is_green);
1268         return 0;
1269 }
1270
1271 /*
1272  * Set up search table for MIMO3
1273  */
1274 static int rs_switch_to_mimo3(struct iwl_mvm *mvm,
1275                              struct iwl_lq_sta *lq_sta,
1276                              struct ieee80211_sta *sta,
1277                              struct iwl_scale_tbl_info *tbl, int index)
1278 {
1279         u16 rate_mask;
1280         s32 rate;
1281         s8 is_green = lq_sta->is_green;
1282
1283         if (!sta->ht_cap.ht_supported)
1284                 return -1;
1285
1286         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1287                 return -1;
1288
1289         /* Need both Tx chains/antennas to support MIMO */
1290         if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) < 3)
1291                 return -1;
1292
1293         IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO3\n");
1294
1295         tbl->lq_type = LQ_MIMO3;
1296         tbl->action = 0;
1297         tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1298         rate_mask = lq_sta->active_mimo3_rate;
1299
1300         if (iwl_is_ht40_tx_allowed(sta))
1301                 tbl->is_ht40 = 1;
1302         else
1303                 tbl->is_ht40 = 0;
1304
1305         rs_set_expected_tpt_table(lq_sta, tbl);
1306
1307         rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1308
1309         IWL_DEBUG_RATE(mvm, "LQ: MIMO3 best rate %d mask %X\n",
1310                        rate, rate_mask);
1311         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1312                 IWL_DEBUG_RATE(mvm, "Can't switch with index %d rate mask %x\n",
1313                                rate, rate_mask);
1314                 return -1;
1315         }
1316         tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green);
1317
1318         IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n",
1319                        tbl->current_rate, is_green);
1320         return 0;
1321 }
1322
1323 /*
1324  * Set up search table for SISO
1325  */
1326 static int rs_switch_to_siso(struct iwl_mvm *mvm,
1327                              struct iwl_lq_sta *lq_sta,
1328                              struct ieee80211_sta *sta,
1329                              struct iwl_scale_tbl_info *tbl, int index)
1330 {
1331         u16 rate_mask;
1332         u8 is_green = lq_sta->is_green;
1333         s32 rate;
1334
1335         if (!sta->ht_cap.ht_supported)
1336                 return -1;
1337
1338         IWL_DEBUG_RATE(mvm, "LQ: try to switch to SISO\n");
1339
1340         tbl->lq_type = LQ_SISO;
1341         tbl->action = 0;
1342         tbl->max_search = IWL_MAX_SEARCH;
1343         rate_mask = lq_sta->active_siso_rate;
1344
1345         if (iwl_is_ht40_tx_allowed(sta))
1346                 tbl->is_ht40 = 1;
1347         else
1348                 tbl->is_ht40 = 0;
1349
1350         if (is_green)
1351                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1352
1353         rs_set_expected_tpt_table(lq_sta, tbl);
1354         rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1355
1356         IWL_DEBUG_RATE(mvm, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1357         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1358                 IWL_DEBUG_RATE(mvm,
1359                                "can not switch with index %d rate mask %x\n",
1360                                rate, rate_mask);
1361                 return -1;
1362         }
1363         tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green);
1364         IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n",
1365                        tbl->current_rate, is_green);
1366         return 0;
1367 }
1368
1369 /*
1370  * Try to switch to new modulation mode from legacy
1371  */
1372 static int rs_move_legacy_other(struct iwl_mvm *mvm,
1373                                 struct iwl_lq_sta *lq_sta,
1374                                 struct ieee80211_sta *sta,
1375                                 int index)
1376 {
1377         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1378         struct iwl_scale_tbl_info *search_tbl =
1379                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1380         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1381         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1382                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1383         u8 start_action;
1384         u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1385         u8 tx_chains_num = num_of_ant(valid_tx_ant);
1386         int ret;
1387         u8 update_search_tbl_counter = 0;
1388
1389         start_action = tbl->action;
1390         while (1) {
1391                 lq_sta->action_counter++;
1392                 switch (tbl->action) {
1393                 case IWL_LEGACY_SWITCH_ANTENNA1:
1394                 case IWL_LEGACY_SWITCH_ANTENNA2:
1395                         IWL_DEBUG_RATE(mvm, "LQ: Legacy toggle Antenna\n");
1396
1397                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1398                              tx_chains_num <= 1) ||
1399                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1400                              tx_chains_num <= 2))
1401                                 break;
1402
1403                         /* Don't change antenna if success has been great */
1404                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1405                                 break;
1406
1407                         /* Set up search table to try other antenna */
1408                         memcpy(search_tbl, tbl, sz);
1409
1410                         if (rs_toggle_antenna(valid_tx_ant,
1411                                               &search_tbl->current_rate,
1412                                               search_tbl)) {
1413                                 update_search_tbl_counter = 1;
1414                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1415                                 goto out;
1416                         }
1417                         break;
1418                 case IWL_LEGACY_SWITCH_SISO:
1419                         IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to SISO\n");
1420
1421                         /* Set up search table to try SISO */
1422                         memcpy(search_tbl, tbl, sz);
1423                         search_tbl->is_SGI = 0;
1424                         ret = rs_switch_to_siso(mvm, lq_sta, sta,
1425                                                  search_tbl, index);
1426                         if (!ret) {
1427                                 lq_sta->action_counter = 0;
1428                                 goto out;
1429                         }
1430
1431                         break;
1432                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1433                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1434                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1435                         IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO2\n");
1436
1437                         /* Set up search table to try MIMO */
1438                         memcpy(search_tbl, tbl, sz);
1439                         search_tbl->is_SGI = 0;
1440
1441                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1442                                 search_tbl->ant_type = ANT_AB;
1443                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1444                                 search_tbl->ant_type = ANT_AC;
1445                         else
1446                                 search_tbl->ant_type = ANT_BC;
1447
1448                         if (!rs_is_valid_ant(valid_tx_ant,
1449                                              search_tbl->ant_type))
1450                                 break;
1451
1452                         ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1453                                                  search_tbl, index);
1454                         if (!ret) {
1455                                 lq_sta->action_counter = 0;
1456                                 goto out;
1457                         }
1458                         break;
1459
1460                 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1461                         IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO3\n");
1462
1463                         /* Set up search table to try MIMO3 */
1464                         memcpy(search_tbl, tbl, sz);
1465                         search_tbl->is_SGI = 0;
1466
1467                         search_tbl->ant_type = ANT_ABC;
1468
1469                         if (!rs_is_valid_ant(valid_tx_ant,
1470                                              search_tbl->ant_type))
1471                                 break;
1472
1473                         ret = rs_switch_to_mimo3(mvm, lq_sta, sta,
1474                                                  search_tbl, index);
1475                         if (!ret) {
1476                                 lq_sta->action_counter = 0;
1477                                 goto out;
1478                         }
1479                         break;
1480                 }
1481                 tbl->action++;
1482                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1483                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1484
1485                 if (tbl->action == start_action)
1486                         break;
1487         }
1488         search_tbl->lq_type = LQ_NONE;
1489         return 0;
1490
1491 out:
1492         lq_sta->search_better_tbl = 1;
1493         tbl->action++;
1494         if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1495                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1496         if (update_search_tbl_counter)
1497                 search_tbl->action = tbl->action;
1498         return 0;
1499 }
1500
1501 /*
1502  * Try to switch to new modulation mode from SISO
1503  */
1504 static int rs_move_siso_to_other(struct iwl_mvm *mvm,
1505                                  struct iwl_lq_sta *lq_sta,
1506                                  struct ieee80211_sta *sta, int index)
1507 {
1508         u8 is_green = lq_sta->is_green;
1509         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1510         struct iwl_scale_tbl_info *search_tbl =
1511                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1512         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1513         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1514         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1515                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1516         u8 start_action;
1517         u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1518         u8 tx_chains_num = num_of_ant(valid_tx_ant);
1519         u8 update_search_tbl_counter = 0;
1520         int ret;
1521
1522         start_action = tbl->action;
1523         while (1) {
1524                 lq_sta->action_counter++;
1525                 switch (tbl->action) {
1526                 case IWL_SISO_SWITCH_ANTENNA1:
1527                 case IWL_SISO_SWITCH_ANTENNA2:
1528                         IWL_DEBUG_RATE(mvm, "LQ: SISO toggle Antenna\n");
1529                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1530                              tx_chains_num <= 1) ||
1531                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1532                              tx_chains_num <= 2))
1533                                 break;
1534
1535                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1536                                 break;
1537
1538                         memcpy(search_tbl, tbl, sz);
1539                         if (rs_toggle_antenna(valid_tx_ant,
1540                                               &search_tbl->current_rate,
1541                                               search_tbl)) {
1542                                 update_search_tbl_counter = 1;
1543                                 goto out;
1544                         }
1545                         break;
1546                 case IWL_SISO_SWITCH_MIMO2_AB:
1547                 case IWL_SISO_SWITCH_MIMO2_AC:
1548                 case IWL_SISO_SWITCH_MIMO2_BC:
1549                         IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO2\n");
1550                         memcpy(search_tbl, tbl, sz);
1551                         search_tbl->is_SGI = 0;
1552
1553                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1554                                 search_tbl->ant_type = ANT_AB;
1555                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1556                                 search_tbl->ant_type = ANT_AC;
1557                         else
1558                                 search_tbl->ant_type = ANT_BC;
1559
1560                         if (!rs_is_valid_ant(valid_tx_ant,
1561                                              search_tbl->ant_type))
1562                                 break;
1563
1564                         ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1565                                                  search_tbl, index);
1566                         if (!ret)
1567                                 goto out;
1568                         break;
1569                 case IWL_SISO_SWITCH_GI:
1570                         if (!tbl->is_ht40 && !(ht_cap->cap &
1571                                                 IEEE80211_HT_CAP_SGI_20))
1572                                 break;
1573                         if (tbl->is_ht40 && !(ht_cap->cap &
1574                                                 IEEE80211_HT_CAP_SGI_40))
1575                                 break;
1576
1577                         IWL_DEBUG_RATE(mvm, "LQ: SISO toggle SGI/NGI\n");
1578
1579                         memcpy(search_tbl, tbl, sz);
1580                         if (is_green) {
1581                                 if (!tbl->is_SGI)
1582                                         break;
1583                                 else
1584                                         IWL_ERR(mvm,
1585                                                 "SGI was set in GF+SISO\n");
1586                         }
1587                         search_tbl->is_SGI = !tbl->is_SGI;
1588                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1589                         if (tbl->is_SGI) {
1590                                 s32 tpt = lq_sta->last_tpt / 100;
1591                                 if (tpt >= search_tbl->expected_tpt[index])
1592                                         break;
1593                         }
1594                         search_tbl->current_rate =
1595                                 rate_n_flags_from_tbl(mvm, search_tbl,
1596                                                       index, is_green);
1597                         update_search_tbl_counter = 1;
1598                         goto out;
1599                 case IWL_SISO_SWITCH_MIMO3_ABC:
1600                         IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO3\n");
1601                         memcpy(search_tbl, tbl, sz);
1602                         search_tbl->is_SGI = 0;
1603                         search_tbl->ant_type = ANT_ABC;
1604
1605                         if (!rs_is_valid_ant(valid_tx_ant,
1606                                              search_tbl->ant_type))
1607                                 break;
1608
1609                         ret = rs_switch_to_mimo3(mvm, lq_sta, sta,
1610                                                  search_tbl, index);
1611                         if (!ret)
1612                                 goto out;
1613                         break;
1614                 }
1615                 tbl->action++;
1616                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1617                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1618
1619                 if (tbl->action == start_action)
1620                         break;
1621         }
1622         search_tbl->lq_type = LQ_NONE;
1623         return 0;
1624
1625  out:
1626         lq_sta->search_better_tbl = 1;
1627         tbl->action++;
1628         if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1629                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1630         if (update_search_tbl_counter)
1631                 search_tbl->action = tbl->action;
1632
1633         return 0;
1634 }
1635
1636 /*
1637  * Try to switch to new modulation mode from MIMO2
1638  */
1639 static int rs_move_mimo2_to_other(struct iwl_mvm *mvm,
1640                                  struct iwl_lq_sta *lq_sta,
1641                                  struct ieee80211_sta *sta, int index)
1642 {
1643         s8 is_green = lq_sta->is_green;
1644         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1645         struct iwl_scale_tbl_info *search_tbl =
1646                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1647         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1648         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1649         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1650                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1651         u8 start_action;
1652         u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1653         u8 tx_chains_num = num_of_ant(valid_tx_ant);
1654         u8 update_search_tbl_counter = 0;
1655         int ret;
1656
1657         start_action = tbl->action;
1658         while (1) {
1659                 lq_sta->action_counter++;
1660                 switch (tbl->action) {
1661                 case IWL_MIMO2_SWITCH_ANTENNA1:
1662                 case IWL_MIMO2_SWITCH_ANTENNA2:
1663                         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle Antennas\n");
1664
1665                         if (tx_chains_num <= 2)
1666                                 break;
1667
1668                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1669                                 break;
1670
1671                         memcpy(search_tbl, tbl, sz);
1672                         if (rs_toggle_antenna(valid_tx_ant,
1673                                               &search_tbl->current_rate,
1674                                               search_tbl)) {
1675                                 update_search_tbl_counter = 1;
1676                                 goto out;
1677                         }
1678                         break;
1679                 case IWL_MIMO2_SWITCH_SISO_A:
1680                 case IWL_MIMO2_SWITCH_SISO_B:
1681                 case IWL_MIMO2_SWITCH_SISO_C:
1682                         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to SISO\n");
1683
1684                         /* Set up new search table for SISO */
1685                         memcpy(search_tbl, tbl, sz);
1686
1687                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1688                                 search_tbl->ant_type = ANT_A;
1689                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1690                                 search_tbl->ant_type = ANT_B;
1691                         else
1692                                 search_tbl->ant_type = ANT_C;
1693
1694                         if (!rs_is_valid_ant(valid_tx_ant,
1695                                              search_tbl->ant_type))
1696                                 break;
1697
1698                         ret = rs_switch_to_siso(mvm, lq_sta, sta,
1699                                                  search_tbl, index);
1700                         if (!ret)
1701                                 goto out;
1702
1703                         break;
1704
1705                 case IWL_MIMO2_SWITCH_GI:
1706                         if (!tbl->is_ht40 && !(ht_cap->cap &
1707                                                 IEEE80211_HT_CAP_SGI_20))
1708                                 break;
1709                         if (tbl->is_ht40 && !(ht_cap->cap &
1710                                                 IEEE80211_HT_CAP_SGI_40))
1711                                 break;
1712
1713                         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle SGI/NGI\n");
1714
1715                         /* Set up new search table for MIMO2 */
1716                         memcpy(search_tbl, tbl, sz);
1717                         search_tbl->is_SGI = !tbl->is_SGI;
1718                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1719                         /*
1720                          * If active table already uses the fastest possible
1721                          * modulation (dual stream with short guard interval),
1722                          * and it's working well, there's no need to look
1723                          * for a better type of modulation!
1724                          */
1725                         if (tbl->is_SGI) {
1726                                 s32 tpt = lq_sta->last_tpt / 100;
1727                                 if (tpt >= search_tbl->expected_tpt[index])
1728                                         break;
1729                         }
1730                         search_tbl->current_rate =
1731                                 rate_n_flags_from_tbl(mvm, search_tbl,
1732                                                       index, is_green);
1733                         update_search_tbl_counter = 1;
1734                         goto out;
1735
1736                 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1737                         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to MIMO3\n");
1738                         memcpy(search_tbl, tbl, sz);
1739                         search_tbl->is_SGI = 0;
1740                         search_tbl->ant_type = ANT_ABC;
1741
1742                         if (!rs_is_valid_ant(valid_tx_ant,
1743                                              search_tbl->ant_type))
1744                                 break;
1745
1746                         ret = rs_switch_to_mimo3(mvm, lq_sta, sta,
1747                                                  search_tbl, index);
1748                         if (!ret)
1749                                 goto out;
1750
1751                         break;
1752                 }
1753                 tbl->action++;
1754                 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1755                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1756
1757                 if (tbl->action == start_action)
1758                         break;
1759         }
1760         search_tbl->lq_type = LQ_NONE;
1761         return 0;
1762  out:
1763         lq_sta->search_better_tbl = 1;
1764         tbl->action++;
1765         if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1766                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1767         if (update_search_tbl_counter)
1768                 search_tbl->action = tbl->action;
1769
1770         return 0;
1771 }
1772
1773 /*
1774  * Try to switch to new modulation mode from MIMO3
1775  */
1776 static int rs_move_mimo3_to_other(struct iwl_mvm *mvm,
1777                                  struct iwl_lq_sta *lq_sta,
1778                                  struct ieee80211_sta *sta, int index)
1779 {
1780         s8 is_green = lq_sta->is_green;
1781         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1782         struct iwl_scale_tbl_info *search_tbl =
1783                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1784         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1785         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1786         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1787                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1788         u8 start_action;
1789         u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1790         u8 tx_chains_num = num_of_ant(valid_tx_ant);
1791         int ret;
1792         u8 update_search_tbl_counter = 0;
1793
1794         start_action = tbl->action;
1795         while (1) {
1796                 lq_sta->action_counter++;
1797                 switch (tbl->action) {
1798                 case IWL_MIMO3_SWITCH_ANTENNA1:
1799                 case IWL_MIMO3_SWITCH_ANTENNA2:
1800                         IWL_DEBUG_RATE(mvm, "LQ: MIMO3 toggle Antennas\n");
1801
1802                         if (tx_chains_num <= 3)
1803                                 break;
1804
1805                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1806                                 break;
1807
1808                         memcpy(search_tbl, tbl, sz);
1809                         if (rs_toggle_antenna(valid_tx_ant,
1810                                               &search_tbl->current_rate,
1811                                               search_tbl))
1812                                 goto out;
1813                         break;
1814                 case IWL_MIMO3_SWITCH_SISO_A:
1815                 case IWL_MIMO3_SWITCH_SISO_B:
1816                 case IWL_MIMO3_SWITCH_SISO_C:
1817                         IWL_DEBUG_RATE(mvm, "LQ: MIMO3 switch to SISO\n");
1818
1819                         /* Set up new search table for SISO */
1820                         memcpy(search_tbl, tbl, sz);
1821
1822                         if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1823                                 search_tbl->ant_type = ANT_A;
1824                         else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1825                                 search_tbl->ant_type = ANT_B;
1826                         else
1827                                 search_tbl->ant_type = ANT_C;
1828
1829                         if (!rs_is_valid_ant(valid_tx_ant,
1830                                              search_tbl->ant_type))
1831                                 break;
1832
1833                         ret = rs_switch_to_siso(mvm, lq_sta, sta,
1834                                                 search_tbl, index);
1835                         if (!ret)
1836                                 goto out;
1837
1838                         break;
1839
1840                 case IWL_MIMO3_SWITCH_MIMO2_AB:
1841                 case IWL_MIMO3_SWITCH_MIMO2_AC:
1842                 case IWL_MIMO3_SWITCH_MIMO2_BC:
1843                         IWL_DEBUG_RATE(mvm, "LQ: MIMO3 switch to MIMO2\n");
1844
1845                         memcpy(search_tbl, tbl, sz);
1846                         search_tbl->is_SGI = 0;
1847                         if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1848                                 search_tbl->ant_type = ANT_AB;
1849                         else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1850                                 search_tbl->ant_type = ANT_AC;
1851                         else
1852                                 search_tbl->ant_type = ANT_BC;
1853
1854                         if (!rs_is_valid_ant(valid_tx_ant,
1855                                              search_tbl->ant_type))
1856                                 break;
1857
1858                         ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1859                                                  search_tbl, index);
1860                         if (!ret)
1861                                 goto out;
1862
1863                         break;
1864
1865                 case IWL_MIMO3_SWITCH_GI:
1866                         if (!tbl->is_ht40 && !(ht_cap->cap &
1867                                                 IEEE80211_HT_CAP_SGI_20))
1868                                 break;
1869                         if (tbl->is_ht40 && !(ht_cap->cap &
1870                                                 IEEE80211_HT_CAP_SGI_40))
1871                                 break;
1872
1873                         IWL_DEBUG_RATE(mvm, "LQ: MIMO3 toggle SGI/NGI\n");
1874
1875                         /* Set up new search table for MIMO */
1876                         memcpy(search_tbl, tbl, sz);
1877                         search_tbl->is_SGI = !tbl->is_SGI;
1878                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1879                         /*
1880                          * If active table already uses the fastest possible
1881                          * modulation (dual stream with short guard interval),
1882                          * and it's working well, there's no need to look
1883                          * for a better type of modulation!
1884                          */
1885                         if (tbl->is_SGI) {
1886                                 s32 tpt = lq_sta->last_tpt / 100;
1887                                 if (tpt >= search_tbl->expected_tpt[index])
1888                                         break;
1889                         }
1890                         search_tbl->current_rate =
1891                                 rate_n_flags_from_tbl(mvm, search_tbl,
1892                                                       index, is_green);
1893                         update_search_tbl_counter = 1;
1894                         goto out;
1895                 }
1896                 tbl->action++;
1897                 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1898                         tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1899
1900                 if (tbl->action == start_action)
1901                         break;
1902         }
1903         search_tbl->lq_type = LQ_NONE;
1904         return 0;
1905  out:
1906         lq_sta->search_better_tbl = 1;
1907         tbl->action++;
1908         if (tbl->action > IWL_MIMO3_SWITCH_GI)
1909                 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1910         if (update_search_tbl_counter)
1911                 search_tbl->action = tbl->action;
1912
1913         return 0;
1914 }
1915
1916 /*
1917  * Check whether we should continue using same modulation mode, or
1918  * begin search for a new mode, based on:
1919  * 1) # tx successes or failures while using this mode
1920  * 2) # times calling this function
1921  * 3) elapsed time in this mode (not used, for now)
1922  */
1923 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1924 {
1925         struct iwl_scale_tbl_info *tbl;
1926         int i;
1927         int active_tbl;
1928         int flush_interval_passed = 0;
1929         struct iwl_mvm *mvm;
1930
1931         mvm = lq_sta->drv;
1932         active_tbl = lq_sta->active_tbl;
1933
1934         tbl = &(lq_sta->lq_info[active_tbl]);
1935
1936         /* If we've been disallowing search, see if we should now allow it */
1937         if (lq_sta->stay_in_tbl) {
1938                 /* Elapsed time using current modulation mode */
1939                 if (lq_sta->flush_timer)
1940                         flush_interval_passed =
1941                                 time_after(jiffies,
1942                                            (unsigned long)(lq_sta->flush_timer +
1943                                                 IWL_RATE_SCALE_FLUSH_INTVL));
1944
1945                 /*
1946                  * Check if we should allow search for new modulation mode.
1947                  * If many frames have failed or succeeded, or we've used
1948                  * this same modulation for a long time, allow search, and
1949                  * reset history stats that keep track of whether we should
1950                  * allow a new search.  Also (below) reset all bitmaps and
1951                  * stats in active history.
1952                  */
1953                 if (force_search ||
1954                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1955                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1956                     ((!lq_sta->search_better_tbl) &&
1957                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1958                         IWL_DEBUG_RATE(mvm,
1959                                        "LQ: stay is expired %d %d %d\n",
1960                                      lq_sta->total_failed,
1961                                      lq_sta->total_success,
1962                                      flush_interval_passed);
1963
1964                         /* Allow search for new mode */
1965                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1966                         lq_sta->total_failed = 0;
1967                         lq_sta->total_success = 0;
1968                         lq_sta->flush_timer = 0;
1969                 /*
1970                  * Else if we've used this modulation mode enough repetitions
1971                  * (regardless of elapsed time or success/failure), reset
1972                  * history bitmaps and rate-specific stats for all rates in
1973                  * active table.
1974                  */
1975                 } else {
1976                         lq_sta->table_count++;
1977                         if (lq_sta->table_count >=
1978                             lq_sta->table_count_limit) {
1979                                 lq_sta->table_count = 0;
1980
1981                                 IWL_DEBUG_RATE(mvm,
1982                                                "LQ: stay in table clear win\n");
1983                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1984                                         rs_rate_scale_clear_window(
1985                                                 &(tbl->win[i]));
1986                         }
1987                 }
1988
1989                 /* If transitioning to allow "search", reset all history
1990                  * bitmaps and stats in active table (this will become the new
1991                  * "search" table). */
1992                 if (!lq_sta->stay_in_tbl) {
1993                         for (i = 0; i < IWL_RATE_COUNT; i++)
1994                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1995                 }
1996         }
1997 }
1998
1999 /*
2000  * setup rate table in uCode
2001  */
2002 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
2003                                struct iwl_lq_sta *lq_sta,
2004                                struct iwl_scale_tbl_info *tbl,
2005                                int index, u8 is_green)
2006 {
2007         u32 rate;
2008
2009         /* Update uCode's rate table. */
2010         rate = rate_n_flags_from_tbl(mvm, tbl, index, is_green);
2011         rs_fill_link_cmd(mvm, lq_sta, rate);
2012         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
2013 }
2014
2015 /*
2016  * Do rate scaling and search for new modulation mode.
2017  */
2018 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2019                                   struct sk_buff *skb,
2020                                   struct ieee80211_sta *sta,
2021                                   struct iwl_lq_sta *lq_sta)
2022 {
2023         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2024         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2025         int low = IWL_RATE_INVALID;
2026         int high = IWL_RATE_INVALID;
2027         int index;
2028         int i;
2029         struct iwl_rate_scale_data *window = NULL;
2030         int current_tpt = IWL_INVALID_VALUE;
2031         int low_tpt = IWL_INVALID_VALUE;
2032         int high_tpt = IWL_INVALID_VALUE;
2033         u32 fail_count;
2034         s8 scale_action = 0;
2035         u16 rate_mask;
2036         u8 update_lq = 0;
2037         struct iwl_scale_tbl_info *tbl, *tbl1;
2038         u16 rate_scale_index_msk = 0;
2039         u8 is_green = 0;
2040         u8 active_tbl = 0;
2041         u8 done_search = 0;
2042         u16 high_low;
2043         s32 sr;
2044         u8 tid = IWL_MAX_TID_COUNT;
2045         struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
2046         struct iwl_mvm_tid_data *tid_data;
2047
2048         IWL_DEBUG_RATE(mvm, "rate scale calculate new rate for skb\n");
2049
2050         /* Send management frames and NO_ACK data using lowest rate. */
2051         /* TODO: this could probably be improved.. */
2052         if (!ieee80211_is_data(hdr->frame_control) ||
2053             info->flags & IEEE80211_TX_CTL_NO_ACK)
2054                 return;
2055
2056         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2057
2058         tid = rs_tl_add_packet(lq_sta, hdr);
2059         if ((tid != IWL_MAX_TID_COUNT) &&
2060             (lq_sta->tx_agg_tid_en & (1 << tid))) {
2061                 tid_data = &sta_priv->tid_data[tid];
2062                 if (tid_data->state == IWL_AGG_OFF)
2063                         lq_sta->is_agg = 0;
2064                 else
2065                         lq_sta->is_agg = 1;
2066         } else {
2067                 lq_sta->is_agg = 0;
2068         }
2069
2070         /*
2071          * Select rate-scale / modulation-mode table to work with in
2072          * the rest of this function:  "search" if searching for better
2073          * modulation mode, or "active" if doing rate scaling within a mode.
2074          */
2075         if (!lq_sta->search_better_tbl)
2076                 active_tbl = lq_sta->active_tbl;
2077         else
2078                 active_tbl = 1 - lq_sta->active_tbl;
2079
2080         tbl = &(lq_sta->lq_info[active_tbl]);
2081         if (is_legacy(tbl->lq_type))
2082                 lq_sta->is_green = 0;
2083         else
2084                 lq_sta->is_green = rs_use_green(sta);
2085         is_green = lq_sta->is_green;
2086
2087         /* current tx rate */
2088         index = lq_sta->last_txrate_idx;
2089
2090         IWL_DEBUG_RATE(mvm, "Rate scale index %d for type %d\n", index,
2091                        tbl->lq_type);
2092
2093         /* rates available for this association, and for modulation mode */
2094         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2095
2096         IWL_DEBUG_RATE(mvm, "mask 0x%04X\n", rate_mask);
2097
2098         /* mask with station rate restriction */
2099         if (is_legacy(tbl->lq_type)) {
2100                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2101                         /* supp_rates has no CCK bits in A mode */
2102                         rate_scale_index_msk = (u16) (rate_mask &
2103                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2104                 else
2105                         rate_scale_index_msk = (u16) (rate_mask &
2106                                                       lq_sta->supp_rates);
2107
2108         } else {
2109                 rate_scale_index_msk = rate_mask;
2110         }
2111
2112         if (!rate_scale_index_msk)
2113                 rate_scale_index_msk = rate_mask;
2114
2115         if (!((1 << index) & rate_scale_index_msk)) {
2116                 IWL_ERR(mvm, "Current Rate is not valid\n");
2117                 if (lq_sta->search_better_tbl) {
2118                         /* revert to active table if search table is not valid*/
2119                         tbl->lq_type = LQ_NONE;
2120                         lq_sta->search_better_tbl = 0;
2121                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2122                         /* get "active" rate info */
2123                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2124                         rs_update_rate_tbl(mvm, lq_sta, tbl, index, is_green);
2125                 }
2126                 return;
2127         }
2128
2129         /* Get expected throughput table and history window for current rate */
2130         if (!tbl->expected_tpt) {
2131                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2132                 return;
2133         }
2134
2135         /* force user max rate if set by user */
2136         if ((lq_sta->max_rate_idx != -1) &&
2137             (lq_sta->max_rate_idx < index)) {
2138                 index = lq_sta->max_rate_idx;
2139                 update_lq = 1;
2140                 window = &(tbl->win[index]);
2141                 goto lq_update;
2142         }
2143
2144         window = &(tbl->win[index]);
2145
2146         /*
2147          * If there is not enough history to calculate actual average
2148          * throughput, keep analyzing results of more tx frames, without
2149          * changing rate or mode (bypass most of the rest of this function).
2150          * Set up new rate table in uCode only if old rate is not supported
2151          * in current association (use new rate found above).
2152          */
2153         fail_count = window->counter - window->success_counter;
2154         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2155             (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2156                 IWL_DEBUG_RATE(mvm,
2157                                "LQ: still below TH. succ=%d total=%d for index %d\n",
2158                                window->success_counter, window->counter, index);
2159
2160                 /* Can't calculate this yet; not enough history */
2161                 window->average_tpt = IWL_INVALID_VALUE;
2162
2163                 /* Should we stay with this modulation mode,
2164                  * or search for a new one? */
2165                 rs_stay_in_table(lq_sta, false);
2166
2167                 goto out;
2168         }
2169         /* Else we have enough samples; calculate estimate of
2170          * actual average throughput */
2171         if (window->average_tpt != ((window->success_ratio *
2172                         tbl->expected_tpt[index] + 64) / 128)) {
2173                 IWL_ERR(mvm,
2174                         "expected_tpt should have been calculated by now\n");
2175                 window->average_tpt = ((window->success_ratio *
2176                                         tbl->expected_tpt[index] + 64) / 128);
2177         }
2178
2179         /* If we are searching for better modulation mode, check success. */
2180         if (lq_sta->search_better_tbl) {
2181                 /* If good success, continue using the "search" mode;
2182                  * no need to send new link quality command, since we're
2183                  * continuing to use the setup that we've been trying. */
2184                 if (window->average_tpt > lq_sta->last_tpt) {
2185                         IWL_DEBUG_RATE(mvm,
2186                                        "LQ: SWITCHING TO NEW TABLE suc=%d cur-tpt=%d old-tpt=%d\n",
2187                                        window->success_ratio,
2188                                        window->average_tpt,
2189                                        lq_sta->last_tpt);
2190
2191                         if (!is_legacy(tbl->lq_type))
2192                                 lq_sta->enable_counter = 1;
2193
2194                         /* Swap tables; "search" becomes "active" */
2195                         lq_sta->active_tbl = active_tbl;
2196                         current_tpt = window->average_tpt;
2197                 /* Else poor success; go back to mode in "active" table */
2198                 } else {
2199                         IWL_DEBUG_RATE(mvm,
2200                                        "LQ: GOING BACK TO THE OLD TABLE suc=%d cur-tpt=%d old-tpt=%d\n",
2201                                        window->success_ratio,
2202                                        window->average_tpt,
2203                                        lq_sta->last_tpt);
2204
2205                         /* Nullify "search" table */
2206                         tbl->lq_type = LQ_NONE;
2207
2208                         /* Revert to "active" table */
2209                         active_tbl = lq_sta->active_tbl;
2210                         tbl = &(lq_sta->lq_info[active_tbl]);
2211
2212                         /* Revert to "active" rate and throughput info */
2213                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2214                         current_tpt = lq_sta->last_tpt;
2215
2216                         /* Need to set up a new rate table in uCode */
2217                         update_lq = 1;
2218                 }
2219
2220                 /* Either way, we've made a decision; modulation mode
2221                  * search is done, allow rate adjustment next time. */
2222                 lq_sta->search_better_tbl = 0;
2223                 done_search = 1;        /* Don't switch modes below! */
2224                 goto lq_update;
2225         }
2226
2227         /* (Else) not in search of better modulation mode, try for better
2228          * starting rate, while staying in this mode. */
2229         high_low = rs_get_adjacent_rate(mvm, index, rate_scale_index_msk,
2230                                         tbl->lq_type);
2231         low = high_low & 0xff;
2232         high = (high_low >> 8) & 0xff;
2233
2234         /* If user set max rate, dont allow higher than user constrain */
2235         if ((lq_sta->max_rate_idx != -1) &&
2236             (lq_sta->max_rate_idx < high))
2237                 high = IWL_RATE_INVALID;
2238
2239         sr = window->success_ratio;
2240
2241         /* Collect measured throughputs for current and adjacent rates */
2242         current_tpt = window->average_tpt;
2243         if (low != IWL_RATE_INVALID)
2244                 low_tpt = tbl->win[low].average_tpt;
2245         if (high != IWL_RATE_INVALID)
2246                 high_tpt = tbl->win[high].average_tpt;
2247
2248         scale_action = 0;
2249
2250         /* Too many failures, decrease rate */
2251         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2252                 IWL_DEBUG_RATE(mvm,
2253                                "decrease rate because of low success_ratio\n");
2254                 scale_action = -1;
2255         /* No throughput measured yet for adjacent rates; try increase. */
2256         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2257                    (high_tpt == IWL_INVALID_VALUE)) {
2258                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2259                         scale_action = 1;
2260                 else if (low != IWL_RATE_INVALID)
2261                         scale_action = 0;
2262         }
2263
2264         /* Both adjacent throughputs are measured, but neither one has better
2265          * throughput; we're using the best rate, don't change it! */
2266         else if ((low_tpt != IWL_INVALID_VALUE) &&
2267                  (high_tpt != IWL_INVALID_VALUE) &&
2268                  (low_tpt < current_tpt) &&
2269                  (high_tpt < current_tpt))
2270                 scale_action = 0;
2271
2272         /* At least one adjacent rate's throughput is measured,
2273          * and may have better performance. */
2274         else {
2275                 /* Higher adjacent rate's throughput is measured */
2276                 if (high_tpt != IWL_INVALID_VALUE) {
2277                         /* Higher rate has better throughput */
2278                         if (high_tpt > current_tpt &&
2279                             sr >= IWL_RATE_INCREASE_TH) {
2280                                 scale_action = 1;
2281                         } else {
2282                                 scale_action = 0;
2283                         }
2284
2285                 /* Lower adjacent rate's throughput is measured */
2286                 } else if (low_tpt != IWL_INVALID_VALUE) {
2287                         /* Lower rate has better throughput */
2288                         if (low_tpt > current_tpt) {
2289                                 IWL_DEBUG_RATE(mvm,
2290                                                "decrease rate because of low tpt\n");
2291                                 scale_action = -1;
2292                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2293                                 scale_action = 1;
2294                         }
2295                 }
2296         }
2297
2298         /* Sanity check; asked for decrease, but success rate or throughput
2299          * has been good at old rate.  Don't change it. */
2300         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2301             ((sr > IWL_RATE_HIGH_TH) ||
2302              (current_tpt > (100 * tbl->expected_tpt[low]))))
2303                 scale_action = 0;
2304
2305         switch (scale_action) {
2306         case -1:
2307                 /* Decrease starting rate, update uCode's rate table */
2308                 if (low != IWL_RATE_INVALID) {
2309                         update_lq = 1;
2310                         index = low;
2311                 }
2312
2313                 break;
2314         case 1:
2315                 /* Increase starting rate, update uCode's rate table */
2316                 if (high != IWL_RATE_INVALID) {
2317                         update_lq = 1;
2318                         index = high;
2319                 }
2320
2321                 break;
2322         case 0:
2323                 /* No change */
2324         default:
2325                 break;
2326         }
2327
2328         IWL_DEBUG_RATE(mvm,
2329                        "choose rate scale index %d action %d low %d high %d type %d\n",
2330                        index, scale_action, low, high, tbl->lq_type);
2331
2332 lq_update:
2333         /* Replace uCode's rate table for the destination station. */
2334         if (update_lq)
2335                 rs_update_rate_tbl(mvm, lq_sta, tbl, index, is_green);
2336
2337         rs_stay_in_table(lq_sta, false);
2338
2339         /*
2340          * Search for new modulation mode if we're:
2341          * 1)  Not changing rates right now
2342          * 2)  Not just finishing up a search
2343          * 3)  Allowing a new search
2344          */
2345         if (!update_lq && !done_search &&
2346             !lq_sta->stay_in_tbl && window->counter) {
2347                 /* Save current throughput to compare with "search" throughput*/
2348                 lq_sta->last_tpt = current_tpt;
2349
2350                 /* Select a new "search" modulation mode to try.
2351                  * If one is found, set up the new "search" table. */
2352                 if (is_legacy(tbl->lq_type))
2353                         rs_move_legacy_other(mvm, lq_sta, sta, index);
2354                 else if (is_siso(tbl->lq_type))
2355                         rs_move_siso_to_other(mvm, lq_sta, sta, index);
2356                 else if (is_mimo2(tbl->lq_type))
2357                         rs_move_mimo2_to_other(mvm, lq_sta, sta, index);
2358                 else
2359                         rs_move_mimo3_to_other(mvm, lq_sta, sta, index);
2360
2361                 /* If new "search" mode was selected, set up in uCode table */
2362                 if (lq_sta->search_better_tbl) {
2363                         /* Access the "search" table, clear its history. */
2364                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2365                         for (i = 0; i < IWL_RATE_COUNT; i++)
2366                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2367
2368                         /* Use new "search" start rate */
2369                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2370
2371                         IWL_DEBUG_RATE(mvm,
2372                                        "Switch current  mcs: %X index: %d\n",
2373                                        tbl->current_rate, index);
2374                         rs_fill_link_cmd(mvm, lq_sta, tbl->current_rate);
2375                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
2376                 } else {
2377                         done_search = 1;
2378                 }
2379         }
2380
2381         if (done_search && !lq_sta->stay_in_tbl) {
2382                 /* If the "active" (non-search) mode was legacy,
2383                  * and we've tried switching antennas,
2384                  * but we haven't been able to try HT modes (not available),
2385                  * stay with best antenna legacy modulation for a while
2386                  * before next round of mode comparisons. */
2387                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2388                 if (is_legacy(tbl1->lq_type) && !sta->ht_cap.ht_supported &&
2389                     lq_sta->action_counter > tbl1->max_search) {
2390                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2391                         rs_set_stay_in_table(mvm, 1, lq_sta);
2392                 }
2393
2394                 /* If we're in an HT mode, and all 3 mode switch actions
2395                  * have been tried and compared, stay in this best modulation
2396                  * mode for a while before next round of mode comparisons. */
2397                 if (lq_sta->enable_counter &&
2398                     (lq_sta->action_counter >= tbl1->max_search)) {
2399                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2400                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2401                             (tid != IWL_MAX_TID_COUNT)) {
2402                                 tid_data = &sta_priv->tid_data[tid];
2403                                 if (tid_data->state == IWL_AGG_OFF) {
2404                                         IWL_DEBUG_RATE(mvm,
2405                                                        "try to aggregate tid %d\n",
2406                                                        tid);
2407                                         rs_tl_turn_on_agg(mvm, tid,
2408                                                           lq_sta, sta);
2409                                 }
2410                         }
2411                         rs_set_stay_in_table(mvm, 0, lq_sta);
2412                 }
2413         }
2414
2415 out:
2416         tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, index, is_green);
2417         lq_sta->last_txrate_idx = index;
2418 }
2419
2420 /**
2421  * rs_initialize_lq - Initialize a station's hardware rate table
2422  *
2423  * The uCode's station table contains a table of fallback rates
2424  * for automatic fallback during transmission.
2425  *
2426  * NOTE: This sets up a default set of values.  These will be replaced later
2427  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2428  *       rc80211_simple.
2429  *
2430  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2431  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2432  *       which requires station table entry to exist).
2433  */
2434 static void rs_initialize_lq(struct iwl_mvm *mvm,
2435                              struct ieee80211_sta *sta,
2436                              struct iwl_lq_sta *lq_sta,
2437                              enum ieee80211_band band)
2438 {
2439         struct iwl_scale_tbl_info *tbl;
2440         int rate_idx;
2441         int i;
2442         u32 rate;
2443         u8 use_green = rs_use_green(sta);
2444         u8 active_tbl = 0;
2445         u8 valid_tx_ant;
2446
2447         if (!sta || !lq_sta)
2448                 return;
2449
2450         i = lq_sta->last_txrate_idx;
2451
2452         valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2453
2454         if (!lq_sta->search_better_tbl)
2455                 active_tbl = lq_sta->active_tbl;
2456         else
2457                 active_tbl = 1 - lq_sta->active_tbl;
2458
2459         tbl = &(lq_sta->lq_info[active_tbl]);
2460
2461         if ((i < 0) || (i >= IWL_RATE_COUNT))
2462                 i = 0;
2463
2464         rate = iwl_rates[i].plcp;
2465         tbl->ant_type = first_antenna(valid_tx_ant);
2466         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2467
2468         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2469                 rate |= RATE_MCS_CCK_MSK;
2470
2471         rs_get_tbl_info_from_mcs(rate, band, tbl, &rate_idx);
2472         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2473                 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2474
2475         rate = rate_n_flags_from_tbl(mvm, tbl, rate_idx, use_green);
2476         tbl->current_rate = rate;
2477         rs_set_expected_tpt_table(lq_sta, tbl);
2478         rs_fill_link_cmd(NULL, lq_sta, rate);
2479         /* TODO restore station should remember the lq cmd */
2480         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_SYNC, true);
2481 }
2482
2483 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2484                         struct ieee80211_tx_rate_control *txrc)
2485 {
2486         struct sk_buff *skb = txrc->skb;
2487         struct ieee80211_supported_band *sband = txrc->sband;
2488         struct iwl_op_mode *op_mode __maybe_unused =
2489                         (struct iwl_op_mode *)mvm_r;
2490         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2491         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2492         struct iwl_lq_sta *lq_sta = mvm_sta;
2493         int rate_idx;
2494
2495         IWL_DEBUG_RATE_LIMIT(mvm, "rate scale calculate new rate for skb\n");
2496
2497         /* Get max rate if user set max rate */
2498         if (lq_sta) {
2499                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2500                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2501                     (lq_sta->max_rate_idx != -1))
2502                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2503                 if ((lq_sta->max_rate_idx < 0) ||
2504                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2505                         lq_sta->max_rate_idx = -1;
2506         }
2507
2508         /* Treat uninitialized rate scaling data same as non-existing. */
2509         if (lq_sta && !lq_sta->drv) {
2510                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2511                 mvm_sta = NULL;
2512         }
2513
2514         /* Send management frames and NO_ACK data using lowest rate. */
2515         if (rate_control_send_low(sta, mvm_sta, txrc))
2516                 return;
2517
2518         rate_idx  = lq_sta->last_txrate_idx;
2519
2520         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2521                 rate_idx -= IWL_FIRST_OFDM_RATE;
2522                 /* 6M and 9M shared same MCS index */
2523                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2524                 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2525                     IWL_RATE_MIMO3_6M_PLCP)
2526                         rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2527                 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2528                          IWL_RATE_MIMO2_6M_PLCP)
2529                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2530                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2531                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2532                         info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2533                 if (lq_sta->last_rate_n_flags & RATE_MCS_CHAN_WIDTH_40) /* TODO */
2534                         info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2535                 if (lq_sta->last_rate_n_flags & RATE_HT_MCS_GF_MSK)
2536                         info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2537         } else {
2538                 /* Check for invalid rates */
2539                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2540                     ((sband->band == IEEE80211_BAND_5GHZ) &&
2541                      (rate_idx < IWL_FIRST_OFDM_RATE)))
2542                         rate_idx = rate_lowest_index(sband, sta);
2543                 /* On valid 5 GHz rate, adjust index */
2544                 else if (sband->band == IEEE80211_BAND_5GHZ)
2545                         rate_idx -= IWL_FIRST_OFDM_RATE;
2546                 info->control.rates[0].flags = 0;
2547         }
2548         info->control.rates[0].idx = rate_idx;
2549 }
2550
2551 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2552                           gfp_t gfp)
2553 {
2554         struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2555         struct iwl_op_mode *op_mode __maybe_unused =
2556                         (struct iwl_op_mode *)mvm_rate;
2557         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2558
2559         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2560
2561         return &sta_priv->lq_sta;
2562 }
2563
2564 /*
2565  * Called after adding a new station to initialize rate scaling
2566  */
2567 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2568                           enum ieee80211_band band)
2569 {
2570         int i, j;
2571         struct ieee80211_hw *hw = mvm->hw;
2572         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2573         struct iwl_mvm_sta *sta_priv;
2574         struct iwl_lq_sta *lq_sta;
2575         struct ieee80211_supported_band *sband;
2576         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2577
2578         sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2579         lq_sta = &sta_priv->lq_sta;
2580         sband = hw->wiphy->bands[band];
2581
2582         lq_sta->lq.sta_id = sta_priv->sta_id;
2583
2584         for (j = 0; j < LQ_SIZE; j++)
2585                 for (i = 0; i < IWL_RATE_COUNT; i++)
2586                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2587
2588         lq_sta->flush_timer = 0;
2589         lq_sta->supp_rates = sta->supp_rates[sband->band];
2590         for (j = 0; j < LQ_SIZE; j++)
2591                 for (i = 0; i < IWL_RATE_COUNT; i++)
2592                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2593
2594         IWL_DEBUG_RATE(mvm,
2595                        "LQ: *** rate scale station global init for station %d ***\n",
2596                        sta_priv->sta_id);
2597         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2598          * the lowest or the highest rate.. Could consider using RSSI from
2599          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2600          * after assoc.. */
2601
2602         lq_sta->max_rate_idx = -1;
2603         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2604         lq_sta->is_green = rs_use_green(sta);
2605         lq_sta->band = sband->band;
2606         /*
2607          * active legacy rates as per supported rates bitmap
2608          */
2609         supp = sta->supp_rates[sband->band];
2610         lq_sta->active_legacy_rate = 0;
2611         for_each_set_bit(i, &supp, BITS_PER_LONG)
2612                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2613
2614         /*
2615          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2616          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2617          */
2618         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2619         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2620         lq_sta->active_siso_rate &= ~((u16)0x2);
2621         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2622
2623         /* Same here */
2624         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2625         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2626         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2627         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2628
2629         lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2630         lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2631         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2632         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2633
2634         IWL_DEBUG_RATE(mvm,
2635                        "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2636                        lq_sta->active_siso_rate,
2637                        lq_sta->active_mimo2_rate,
2638                        lq_sta->active_mimo3_rate);
2639
2640         /* These values will be overridden later */
2641         lq_sta->lq.single_stream_ant_msk =
2642                 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
2643         lq_sta->lq.dual_stream_ant_msk =
2644                 iwl_fw_valid_tx_ant(mvm->fw) &
2645                 ~first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
2646         if (!lq_sta->lq.dual_stream_ant_msk) {
2647                 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2648         } else if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) == 2) {
2649                 lq_sta->lq.dual_stream_ant_msk =
2650                         iwl_fw_valid_tx_ant(mvm->fw);
2651         }
2652
2653         /* as default allow aggregation for all tids */
2654         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2655         lq_sta->drv = mvm;
2656
2657         /* Set last_txrate_idx to lowest rate */
2658         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2659         if (sband->band == IEEE80211_BAND_5GHZ)
2660                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2661         lq_sta->is_agg = 0;
2662 #ifdef CONFIG_MAC80211_DEBUGFS
2663         lq_sta->dbg_fixed_rate = 0;
2664 #endif
2665
2666         rs_initialize_lq(mvm, sta, lq_sta, band);
2667 }
2668
2669 static void rs_fill_link_cmd(struct iwl_mvm *mvm,
2670                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2671 {
2672         struct iwl_scale_tbl_info tbl_type;
2673         int index = 0;
2674         int rate_idx;
2675         int repeat_rate = 0;
2676         u8 ant_toggle_cnt = 0;
2677         u8 use_ht_possible = 1;
2678         u8 valid_tx_ant = 0;
2679         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2680
2681         /* Override starting rate (index 0) if needed for debug purposes */
2682         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2683
2684         /* Interpret new_rate (rate_n_flags) */
2685         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2686                                  &tbl_type, &rate_idx);
2687
2688         /* How many times should we repeat the initial rate? */
2689         if (is_legacy(tbl_type.lq_type)) {
2690                 ant_toggle_cnt = 1;
2691                 repeat_rate = IWL_NUMBER_TRY;
2692         } else {
2693                 repeat_rate = min(IWL_HT_NUMBER_TRY,
2694                                   LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2695         }
2696
2697         lq_cmd->mimo_delim = is_mimo(tbl_type.lq_type) ? 1 : 0;
2698
2699         /* Fill 1st table entry (index 0) */
2700         lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2701
2702         if (num_of_ant(tbl_type.ant_type) == 1)
2703                 lq_cmd->single_stream_ant_msk = tbl_type.ant_type;
2704         else if (num_of_ant(tbl_type.ant_type) == 2)
2705                 lq_cmd->dual_stream_ant_msk = tbl_type.ant_type;
2706         /* otherwise we don't modify the existing value */
2707
2708         index++;
2709         repeat_rate--;
2710         if (mvm)
2711                 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2712
2713         /* Fill rest of rate table */
2714         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2715                 /* Repeat initial/next rate.
2716                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2717                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2718                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2719                         if (is_legacy(tbl_type.lq_type)) {
2720                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2721                                         ant_toggle_cnt++;
2722                                 else if (mvm &&
2723                                          rs_toggle_antenna(valid_tx_ant,
2724                                                         &new_rate, &tbl_type))
2725                                         ant_toggle_cnt = 1;
2726                         }
2727
2728                         /* Override next rate if needed for debug purposes */
2729                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2730
2731                         /* Fill next table entry */
2732                         lq_cmd->rs_table[index] =
2733                                         cpu_to_le32(new_rate);
2734                         repeat_rate--;
2735                         index++;
2736                 }
2737
2738                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2739                                          &rate_idx);
2740
2741
2742                 /* Indicate to uCode which entries might be MIMO.
2743                  * If initial rate was MIMO, this will finally end up
2744                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2745                 if (is_mimo(tbl_type.lq_type))
2746                         lq_cmd->mimo_delim = index;
2747
2748                 /* Get next rate */
2749                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2750                                              use_ht_possible);
2751
2752                 /* How many times should we repeat the next rate? */
2753                 if (is_legacy(tbl_type.lq_type)) {
2754                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2755                                 ant_toggle_cnt++;
2756                         else if (mvm &&
2757                                  rs_toggle_antenna(valid_tx_ant,
2758                                                    &new_rate, &tbl_type))
2759                                 ant_toggle_cnt = 1;
2760
2761                         repeat_rate = IWL_NUMBER_TRY;
2762                 } else {
2763                         repeat_rate = IWL_HT_NUMBER_TRY;
2764                 }
2765
2766                 /* Don't allow HT rates after next pass.
2767                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2768                 use_ht_possible = 0;
2769
2770                 /* Override next rate if needed for debug purposes */
2771                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2772
2773                 /* Fill next table entry */
2774                 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2775
2776                 index++;
2777                 repeat_rate--;
2778         }
2779
2780         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2781         lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2782
2783         lq_cmd->agg_time_limit =
2784                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2785 }
2786
2787 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2788 {
2789         return hw->priv;
2790 }
2791 /* rate scale requires free function to be implemented */
2792 static void rs_free(void *mvm_rate)
2793 {
2794         return;
2795 }
2796
2797 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2798                         void *mvm_sta)
2799 {
2800         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2801         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2802
2803         IWL_DEBUG_RATE(mvm, "enter\n");
2804         IWL_DEBUG_RATE(mvm, "leave\n");
2805 }
2806
2807 #ifdef CONFIG_MAC80211_DEBUGFS
2808 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2809                              u32 *rate_n_flags, int index)
2810 {
2811         struct iwl_mvm *mvm;
2812         u8 valid_tx_ant;
2813         u8 ant_sel_tx;
2814
2815         mvm = lq_sta->drv;
2816         valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2817         if (lq_sta->dbg_fixed_rate) {
2818                 ant_sel_tx =
2819                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2820                   >> RATE_MCS_ANT_POS);
2821                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2822                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2823                         IWL_DEBUG_RATE(mvm, "Fixed rate ON\n");
2824                 } else {
2825                         lq_sta->dbg_fixed_rate = 0;
2826                         IWL_ERR(mvm,
2827                                 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2828                                 ant_sel_tx, valid_tx_ant);
2829                         IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2830                 }
2831         } else {
2832                 IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2833         }
2834 }
2835
2836 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2837                         const char __user *user_buf, size_t count, loff_t *ppos)
2838 {
2839         struct iwl_lq_sta *lq_sta = file->private_data;
2840         struct iwl_mvm *mvm;
2841         char buf[64];
2842         size_t buf_size;
2843         u32 parsed_rate;
2844
2845
2846         mvm = lq_sta->drv;
2847         memset(buf, 0, sizeof(buf));
2848         buf_size = min(count, sizeof(buf) -  1);
2849         if (copy_from_user(buf, user_buf, buf_size))
2850                 return -EFAULT;
2851
2852         if (sscanf(buf, "%x", &parsed_rate) == 1)
2853                 lq_sta->dbg_fixed_rate = parsed_rate;
2854         else
2855                 lq_sta->dbg_fixed_rate = 0;
2856
2857         rs_program_fix_rate(mvm, lq_sta);
2858
2859         return count;
2860 }
2861
2862 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2863                         char __user *user_buf, size_t count, loff_t *ppos)
2864 {
2865         char *buff;
2866         int desc = 0;
2867         int i = 0;
2868         int index = 0;
2869         ssize_t ret;
2870
2871         struct iwl_lq_sta *lq_sta = file->private_data;
2872         struct iwl_mvm *mvm;
2873         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2874
2875         mvm = lq_sta->drv;
2876         buff = kmalloc(1024, GFP_KERNEL);
2877         if (!buff)
2878                 return -ENOMEM;
2879
2880         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2881         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2882                         lq_sta->total_failed, lq_sta->total_success,
2883                         lq_sta->active_legacy_rate);
2884         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2885                         lq_sta->dbg_fixed_rate);
2886         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2887             (iwl_fw_valid_tx_ant(mvm->fw) & ANT_A) ? "ANT_A," : "",
2888             (iwl_fw_valid_tx_ant(mvm->fw) & ANT_B) ? "ANT_B," : "",
2889             (iwl_fw_valid_tx_ant(mvm->fw) & ANT_C) ? "ANT_C" : "");
2890         desc += sprintf(buff+desc, "lq type %s\n",
2891            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2892         if (is_Ht(tbl->lq_type)) {
2893                 desc += sprintf(buff+desc, " %s",
2894                    (is_siso(tbl->lq_type)) ? "SISO" :
2895                    ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2896                    desc += sprintf(buff+desc, " %s",
2897                    (tbl->is_ht40) ? "40MHz" : "20MHz");
2898                    desc += sprintf(buff+desc, " %s %s %s\n",
2899                                    (tbl->is_SGI) ? "SGI" : "",
2900                    (lq_sta->is_green) ? "GF enabled" : "",
2901                    (lq_sta->is_agg) ? "AGG on" : "");
2902         }
2903         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2904                         lq_sta->last_rate_n_flags);
2905         desc += sprintf(buff+desc,
2906                         "general: flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2907                         lq_sta->lq.flags,
2908                         lq_sta->lq.mimo_delim,
2909                         lq_sta->lq.single_stream_ant_msk,
2910                         lq_sta->lq.dual_stream_ant_msk);
2911
2912         desc += sprintf(buff+desc,
2913                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2914                         le16_to_cpu(lq_sta->lq.agg_time_limit),
2915                         lq_sta->lq.agg_disable_start_th,
2916                         lq_sta->lq.agg_frame_cnt_limit);
2917
2918         desc += sprintf(buff+desc,
2919                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2920                         lq_sta->lq.initial_rate_index[0],
2921                         lq_sta->lq.initial_rate_index[1],
2922                         lq_sta->lq.initial_rate_index[2],
2923                         lq_sta->lq.initial_rate_index[3]);
2924
2925         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2926                 index = iwl_hwrate_to_plcp_idx(
2927                         le32_to_cpu(lq_sta->lq.rs_table[i]));
2928                 if (is_legacy(tbl->lq_type)) {
2929                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2930                                         i, le32_to_cpu(lq_sta->lq.rs_table[i]),
2931                                         iwl_rate_mcs[index].mbps);
2932                 } else {
2933                         desc += sprintf(buff+desc,
2934                                         " rate[%d] 0x%X %smbps (%s)\n",
2935                                         i, le32_to_cpu(lq_sta->lq.rs_table[i]),
2936                                         iwl_rate_mcs[index].mbps,
2937                                         iwl_rate_mcs[index].mcs);
2938                 }
2939         }
2940
2941         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2942         kfree(buff);
2943         return ret;
2944 }
2945
2946 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2947         .write = rs_sta_dbgfs_scale_table_write,
2948         .read = rs_sta_dbgfs_scale_table_read,
2949         .open = simple_open,
2950         .llseek = default_llseek,
2951 };
2952 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2953                         char __user *user_buf, size_t count, loff_t *ppos)
2954 {
2955         char *buff;
2956         int desc = 0;
2957         int i, j;
2958         ssize_t ret;
2959
2960         struct iwl_lq_sta *lq_sta = file->private_data;
2961
2962         buff = kmalloc(1024, GFP_KERNEL);
2963         if (!buff)
2964                 return -ENOMEM;
2965
2966         for (i = 0; i < LQ_SIZE; i++) {
2967                 desc += sprintf(buff+desc,
2968                                 "%s type=%d SGI=%d HT40=%d DUP=0 GF=%d\n"
2969                                 "rate=0x%X\n",
2970                                 lq_sta->active_tbl == i ? "*" : "x",
2971                                 lq_sta->lq_info[i].lq_type,
2972                                 lq_sta->lq_info[i].is_SGI,
2973                                 lq_sta->lq_info[i].is_ht40,
2974                                 lq_sta->is_green,
2975                                 lq_sta->lq_info[i].current_rate);
2976                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2977                         desc += sprintf(buff+desc,
2978                                 "counter=%d success=%d %%=%d\n",
2979                                 lq_sta->lq_info[i].win[j].counter,
2980                                 lq_sta->lq_info[i].win[j].success_counter,
2981                                 lq_sta->lq_info[i].win[j].success_ratio);
2982                 }
2983         }
2984         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2985         kfree(buff);
2986         return ret;
2987 }
2988
2989 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2990         .read = rs_sta_dbgfs_stats_table_read,
2991         .open = simple_open,
2992         .llseek = default_llseek,
2993 };
2994
2995 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2996                         char __user *user_buf, size_t count, loff_t *ppos)
2997 {
2998         struct iwl_lq_sta *lq_sta = file->private_data;
2999         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3000         char buff[120];
3001         int desc = 0;
3002
3003         if (is_Ht(tbl->lq_type))
3004                 desc += sprintf(buff+desc,
3005                                 "Bit Rate= %d Mb/s\n",
3006                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3007         else
3008                 desc += sprintf(buff+desc,
3009                                 "Bit Rate= %d Mb/s\n",
3010                                 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3011
3012         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3013 }
3014
3015 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3016         .read = rs_sta_dbgfs_rate_scale_data_read,
3017         .open = simple_open,
3018         .llseek = default_llseek,
3019 };
3020
3021 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3022 {
3023         struct iwl_lq_sta *lq_sta = mvm_sta;
3024         lq_sta->rs_sta_dbgfs_scale_table_file =
3025                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3026                                     lq_sta, &rs_sta_dbgfs_scale_table_ops);
3027         lq_sta->rs_sta_dbgfs_stats_table_file =
3028                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3029                                     lq_sta, &rs_sta_dbgfs_stats_table_ops);
3030         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3031                 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3032                                     lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3033         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3034                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3035                                   &lq_sta->tx_agg_tid_en);
3036 }
3037
3038 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3039 {
3040         struct iwl_lq_sta *lq_sta = mvm_sta;
3041         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3042         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3043         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3044         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3045 }
3046 #endif
3047
3048 /*
3049  * Initialization of rate scaling information is done by driver after
3050  * the station is added. Since mac80211 calls this function before a
3051  * station is added we ignore it.
3052  */
3053 static void rs_rate_init_stub(void *mvm_r,
3054                                  struct ieee80211_supported_band *sband,
3055                                  struct ieee80211_sta *sta, void *mvm_sta)
3056 {
3057 }
3058 static struct rate_control_ops rs_mvm_ops = {
3059         .module = NULL,
3060         .name = RS_NAME,
3061         .tx_status = rs_tx_status,
3062         .get_rate = rs_get_rate,
3063         .rate_init = rs_rate_init_stub,
3064         .alloc = rs_alloc,
3065         .free = rs_free,
3066         .alloc_sta = rs_alloc_sta,
3067         .free_sta = rs_free_sta,
3068 #ifdef CONFIG_MAC80211_DEBUGFS
3069         .add_sta_debugfs = rs_add_debugfs,
3070         .remove_sta_debugfs = rs_remove_debugfs,
3071 #endif
3072 };
3073
3074 int iwl_mvm_rate_control_register(void)
3075 {
3076         return ieee80211_rate_control_register(&rs_mvm_ops);
3077 }
3078
3079 void iwl_mvm_rate_control_unregister(void)
3080 {
3081         ieee80211_rate_control_unregister(&rs_mvm_ops);
3082 }