drivers/net/wireless/iwlwifi/iwl-agn-rs.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2010 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 <linux/wireless.h>
  31 #include <net/mac80211.h>
  32
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/delay.h>
  36
  37 #include <linux/workqueue.h>
  38
  39 #include "iwl-dev.h"
  40 #include "iwl-sta.h"
  41 #include "iwl-core.h"
  42
  43 #define RS_NAME "iwl-agn-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 static void rs_rate_scale_perform(struct iwl_priv *priv,
  80                                    struct sk_buff *skb,
  81                                    struct ieee80211_sta *sta,
  82                                    struct iwl_lq_sta *lq_sta);
  83 static void rs_fill_link_cmd(struct iwl_priv *priv,
  84                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
  85
  86
  87 #ifdef CONFIG_MAC80211_DEBUGFS
  88 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
  89                              u32 *rate_n_flags, int index);
  90 #else
  91 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
  92                              u32 *rate_n_flags, int index)
  93 {}
  94 #endif
  95
  96 /**
  97  * The following tables contain the expected throughput metrics for all rates
  98  *
  99  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 100  *
 101  * where invalid entries are zeros.
 102  *
 103  * CCK rates are only valid in legacy table and will only be used in G
 104  * (2.4 GHz) band.
 105  */
 106
 107 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
 108         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 109 };
 110
 111 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
 112         {0, 0, 0, 0, 42, 0,  76, 102, 124, 158, 183, 193, 202}, /* Norm */
 113         {0, 0, 0, 0, 46, 0,  82, 110, 132, 167, 192, 202, 210}, /* SGI */
 114         {0, 0, 0, 0, 48, 0,  93, 135, 176, 251, 319, 351, 381}, /* AGG */
 115         {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
 116 };
 117
 118 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
 119         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 120         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 121         {0, 0, 0, 0,  96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
 122         {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */
 123 };
 124
 125 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 126         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
 127         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
 128         {0, 0, 0, 0,  92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
 129         {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI*/
 130 };
 131
 132 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 133         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
 134         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
 135         {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */
 136         {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */
 137 };
 138
 139 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
 140         {0, 0, 0, 0,  99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
 141         {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
 142         {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
 143         {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
 144 };
 145
 146 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
 147         {0, 0, 0, 0, 152, 0, 211, 239, 255, 279,  290,  294,  297}, /* Norm */
 148         {0, 0, 0, 0, 160, 0, 219, 245, 261, 284,  294,  297,  300}, /* SGI */
 149         {0, 0, 0, 0, 254, 0, 443, 584, 695, 868,  984, 1030, 1070}, /* AGG */
 150         {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
 151 };
 152
 153 /* mbps, mcs */
 154 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 155         {  "1", "BPSK DSSS"},
 156         {  "2", "QPSK DSSS"},
 157         {"5.5", "BPSK CCK"},
 158         { "11", "QPSK CCK"},
 159         {  "6", "BPSK 1/2"},
 160         {  "9", "BPSK 1/2"},
 161         { "12", "QPSK 1/2"},
 162         { "18", "QPSK 3/4"},
 163         { "24", "16QAM 1/2"},
 164         { "36", "16QAM 3/4"},
 165         { "48", "64QAM 2/3"},
 166         { "54", "64QAM 3/4"},
 167         { "60", "64QAM 5/6"},
 168 };
 169
 170 #define MCS_INDEX_PER_STREAM    (8)
 171
 172 static inline u8 rs_extract_rate(u32 rate_n_flags)
 173 {
 174         return (u8)(rate_n_flags & 0xFF);
 175 }
 176
 177 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 178 {
 179         window->data = 0;
 180         window->success_counter = 0;
 181         window->success_ratio = IWL_INVALID_VALUE;
 182         window->counter = 0;
 183         window->average_tpt = IWL_INVALID_VALUE;
 184         window->stamp = 0;
 185 }
 186
 187 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 188 {
 189         return (ant_type & valid_antenna) == ant_type;
 190 }
 191
 192 /*
 193  *      removes the old data from the statistics. All data that is older than
 194  *      TID_MAX_TIME_DIFF, will be deleted.
 195  */
 196 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 197 {
 198         /* The oldest age we want to keep */
 199         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 200
 201         while (tl->queue_count &&
 202                (tl->time_stamp < oldest_time)) {
 203                 tl->total -= tl->packet_count[tl->head];
 204                 tl->packet_count[tl->head] = 0;
 205                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 206                 tl->queue_count--;
 207                 tl->head++;
 208                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 209                         tl->head = 0;
 210         }
 211 }
 212
 213 /*
 214  *      increment traffic load value for tid and also remove
 215  *      any old values if passed the certain time period
 216  */
 217 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 218                            struct ieee80211_hdr *hdr)
 219 {
 220         u32 curr_time = jiffies_to_msecs(jiffies);
 221         u32 time_diff;
 222         s32 index;
 223         struct iwl_traffic_load *tl = NULL;
 224         u8 tid;
 225
 226         if (ieee80211_is_data_qos(hdr->frame_control)) {
 227                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 228                 tid = qc[0] & 0xf;
 229         } else
 230                 return MAX_TID_COUNT;
 231
 232         if (unlikely(tid >= TID_MAX_LOAD_COUNT))
 233                 return MAX_TID_COUNT;
 234
 235         tl = &lq_data->load[tid];
 236
 237         curr_time -= curr_time % TID_ROUND_VALUE;
 238
 239         /* Happens only for the first packet. Initialize the data */
 240         if (!(tl->queue_count)) {
 241                 tl->total = 1;
 242                 tl->time_stamp = curr_time;
 243                 tl->queue_count = 1;
 244                 tl->head = 0;
 245                 tl->packet_count[0] = 1;
 246                 return MAX_TID_COUNT;
 247         }
 248
 249         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 250         index = time_diff / TID_QUEUE_CELL_SPACING;
 251
 252         /* The history is too long: remove data that is older than */
 253         /* TID_MAX_TIME_DIFF */
 254         if (index >= TID_QUEUE_MAX_SIZE)
 255                 rs_tl_rm_old_stats(tl, curr_time);
 256
 257         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 258         tl->packet_count[index] = tl->packet_count[index] + 1;
 259         tl->total = tl->total + 1;
 260
 261         if ((index + 1) > tl->queue_count)
 262                 tl->queue_count = index + 1;
 263
 264         return tid;
 265 }
 266
 267 /*
 268         get the traffic load value for tid
 269 */
 270 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 271 {
 272         u32 curr_time = jiffies_to_msecs(jiffies);
 273         u32 time_diff;
 274         s32 index;
 275         struct iwl_traffic_load *tl = NULL;
 276
 277         if (tid >= TID_MAX_LOAD_COUNT)
 278                 return 0;
 279
 280         tl = &(lq_data->load[tid]);
 281
 282         curr_time -= curr_time % TID_ROUND_VALUE;
 283
 284         if (!(tl->queue_count))
 285                 return 0;
 286
 287         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 288         index = time_diff / TID_QUEUE_CELL_SPACING;
 289
 290         /* The history is too long: remove data that is older than */
 291         /* TID_MAX_TIME_DIFF */
 292         if (index >= TID_QUEUE_MAX_SIZE)
 293                 rs_tl_rm_old_stats(tl, curr_time);
 294
 295         return tl->total;
 296 }
 297
 298 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 299                                       struct iwl_lq_sta *lq_data, u8 tid,
 300                                       struct ieee80211_sta *sta)
 301 {
 302         int ret = -EAGAIN;
 303         u32 load = rs_tl_get_load(lq_data, tid);
 304
 305         if (load > IWL_AGG_LOAD_THRESHOLD) {
 306                 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
 307                                 sta->addr, tid);
 308                 ret = ieee80211_start_tx_ba_session(sta, tid);
 309                 if (ret == -EAGAIN) {
 310                         /*
 311                          * driver and mac80211 is out of sync
 312                          * this might be cause by reloading firmware
 313                          * stop the tx ba session here
 314                          */
 315                         IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
 316                                 tid);
 317                         ieee80211_stop_tx_ba_session(sta, tid);
 318                 }
 319         } else {
 320                 IWL_ERR(priv, "Aggregation not enabled for tid %d "
 321                         "because load = %u\n", tid, load);
 322         }
 323         return ret;
 324 }
 325
 326 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 327                               struct iwl_lq_sta *lq_data,
 328                               struct ieee80211_sta *sta)
 329 {
 330         if (tid < TID_MAX_LOAD_COUNT)
 331                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 332         else
 333                 IWL_ERR(priv, "tid exceeds max load count: %d/%d\n",
 334                         tid, TID_MAX_LOAD_COUNT);
 335 }
 336
 337 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 338 {
 339         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 340                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 341                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 342 }
 343
 344 /*
 345  * Static function to get the expected throughput from an iwl_scale_tbl_info
 346  * that wraps a NULL pointer check
 347  */
 348 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 349 {
 350         if (tbl->expected_tpt)
 351                 return tbl->expected_tpt[rs_index];
 352         return 0;
 353 }
 354
 355 /**
 356  * rs_collect_tx_data - Update the success/failure sliding window
 357  *
 358  * We keep a sliding window of the last 62 packets transmitted
 359  * at this rate.  window->data contains the bitmask of successful
 360  * packets.
 361  */
 362 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 363                               int scale_index, int attempts, int successes)
 364 {
 365         struct iwl_rate_scale_data *window = NULL;
 366         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 367         s32 fail_count, tpt;
 368
 369         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 370                 return -EINVAL;
 371
 372         /* Select window for current tx bit rate */
 373         window = &(tbl->win[scale_index]);
 374
 375         /* Get expected throughput */
 376         tpt = get_expected_tpt(tbl, scale_index);
 377
 378         /*
 379          * Keep track of only the latest 62 tx frame attempts in this rate's
 380          * history window; anything older isn't really relevant any more.
 381          * If we have filled up the sliding window, drop the oldest attempt;
 382          * if the oldest attempt (highest bit in bitmap) shows "success",
 383          * subtract "1" from the success counter (this is the main reason
 384          * we keep these bitmaps!).
 385          */
 386         while (attempts > 0) {
 387                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 388
 389                         /* remove earliest */
 390                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 391
 392                         if (window->data & mask) {
 393                                 window->data &= ~mask;
 394                                 window->success_counter--;
 395                         }
 396                 }
 397
 398                 /* Increment frames-attempted counter */
 399                 window->counter++;
 400
 401                 /* Shift bitmap by one frame to throw away oldest history */
 402                 window->data <<= 1;
 403
 404                 /* Mark the most recent #successes attempts as successful */
 405                 if (successes > 0) {
 406                         window->success_counter++;
 407                         window->data |= 0x1;
 408                         successes--;
 409                 }
 410
 411                 attempts--;
 412         }
 413
 414         /* Calculate current success ratio, avoid divide-by-0! */
 415         if (window->counter > 0)
 416                 window->success_ratio = 128 * (100 * window->success_counter)
 417                                         / window->counter;
 418         else
 419                 window->success_ratio = IWL_INVALID_VALUE;
 420
 421         fail_count = window->counter - window->success_counter;
 422
 423         /* Calculate average throughput, if we have enough history. */
 424         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 425             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 426                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 427         else
 428                 window->average_tpt = IWL_INVALID_VALUE;
 429
 430         /* Tag this window as having been updated */
 431         window->stamp = jiffies;
 432
 433         return 0;
 434 }
 435
 436 /*
 437  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 438  */
 439 /* FIXME:RS:remove this function and put the flags statically in the table */
 440 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
 441                                  struct iwl_scale_tbl_info *tbl,
 442                                  int index, u8 use_green)
 443 {
 444         u32 rate_n_flags = 0;
 445
 446         if (is_legacy(tbl->lq_type)) {
 447                 rate_n_flags = iwl_rates[index].plcp;
 448                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 449                         rate_n_flags |= RATE_MCS_CCK_MSK;
 450
 451         } else if (is_Ht(tbl->lq_type)) {
 452                 if (index > IWL_LAST_OFDM_RATE) {
 453                         IWL_ERR(priv, "Invalid HT rate index %d\n", index);
 454                         index = IWL_LAST_OFDM_RATE;
 455                 }
 456                 rate_n_flags = RATE_MCS_HT_MSK;
 457
 458                 if (is_siso(tbl->lq_type))
 459                         rate_n_flags |= iwl_rates[index].plcp_siso;
 460                 else if (is_mimo2(tbl->lq_type))
 461                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 462                 else
 463                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 464         } else {
 465                 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 466         }
 467
 468         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 469                                                      RATE_MCS_ANT_ABC_MSK);
 470
 471         if (is_Ht(tbl->lq_type)) {
 472                 if (tbl->is_ht40) {
 473                         if (tbl->is_dup)
 474                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 475                         else
 476                                 rate_n_flags |= RATE_MCS_HT40_MSK;
 477                 }
 478                 if (tbl->is_SGI)
 479                         rate_n_flags |= RATE_MCS_SGI_MSK;
 480
 481                 if (use_green) {
 482                         rate_n_flags |= RATE_MCS_GF_MSK;
 483                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 484                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 485                                 IWL_ERR(priv, "GF was set with SGI:SISO\n");
 486                         }
 487                 }
 488         }
 489         return rate_n_flags;
 490 }
 491
 492 /*
 493  * Interpret uCode API's rate_n_flags format,
 494  * fill "search" or "active" tx mode table.
 495  */
 496 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 497                                     enum ieee80211_band band,
 498                                     struct iwl_scale_tbl_info *tbl,
 499                                     int *rate_idx)
 500 {
 501         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 502         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 503         u8 mcs;
 504
 505         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 506
 507         if (*rate_idx  == IWL_RATE_INVALID) {
 508                 *rate_idx = -1;
 509                 return -EINVAL;
 510         }
 511         tbl->is_SGI = 0;        /* default legacy setup */
 512         tbl->is_ht40 = 0;
 513         tbl->is_dup = 0;
 514         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 515         tbl->lq_type = LQ_NONE;
 516         tbl->max_search = IWL_MAX_SEARCH;
 517
 518         /* legacy rate format */
 519         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 520                 if (num_of_ant == 1) {
 521                         if (band == IEEE80211_BAND_5GHZ)
 522                                 tbl->lq_type = LQ_A;
 523                         else
 524                                 tbl->lq_type = LQ_G;
 525                 }
 526         /* HT rate format */
 527         } else {
 528                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 529                         tbl->is_SGI = 1;
 530
 531                 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
 532                     (rate_n_flags & RATE_MCS_DUP_MSK))
 533                         tbl->is_ht40 = 1;
 534
 535                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 536                         tbl->is_dup = 1;
 537
 538                 mcs = rs_extract_rate(rate_n_flags);
 539
 540                 /* SISO */
 541                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 542                         if (num_of_ant == 1)
 543                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 544                 /* MIMO2 */
 545                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 546                         if (num_of_ant == 2)
 547                                 tbl->lq_type = LQ_MIMO2;
 548                 /* MIMO3 */
 549                 } else {
 550                         if (num_of_ant == 3) {
 551                                 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
 552                                 tbl->lq_type = LQ_MIMO3;
 553                         }
 554                 }
 555         }
 556         return 0;
 557 }
 558
 559 /* switch to another antenna/antennas and return 1 */
 560 /* if no other valid antenna found, return 0 */
 561 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 562                              struct iwl_scale_tbl_info *tbl)
 563 {
 564         u8 new_ant_type;
 565
 566         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 567                 return 0;
 568
 569         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 570                 return 0;
 571
 572         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 573
 574         while ((new_ant_type != tbl->ant_type) &&
 575                !rs_is_valid_ant(valid_ant, new_ant_type))
 576                 new_ant_type = ant_toggle_lookup[new_ant_type];
 577
 578         if (new_ant_type == tbl->ant_type)
 579                 return 0;
 580
 581         tbl->ant_type = new_ant_type;
 582         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 583         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 584         return 1;
 585 }
 586
 587 /**
 588  * Green-field mode is valid if the station supports it and
 589  * there are no non-GF stations present in the BSS.
 590  */
 591 static inline u8 rs_use_green(struct ieee80211_sta *sta,
 592                               struct iwl_ht_config *ht_conf)
 593 {
 594         return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
 595                 !(ht_conf->non_GF_STA_present);
 596 }
 597
 598 /**
 599  * rs_get_supported_rates - get the available rates
 600  *
 601  * if management frame or broadcast frame only return
 602  * basic available rates.
 603  *
 604  */
 605 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 606                                   struct ieee80211_hdr *hdr,
 607                                   enum iwl_table_type rate_type)
 608 {
 609         if (is_legacy(rate_type)) {
 610                 return lq_sta->active_legacy_rate;
 611         } else {
 612                 if (is_siso(rate_type))
 613                         return lq_sta->active_siso_rate;
 614                 else if (is_mimo2(rate_type))
 615                         return lq_sta->active_mimo2_rate;
 616                 else
 617                         return lq_sta->active_mimo3_rate;
 618         }
 619 }
 620
 621 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 622                                 int rate_type)
 623 {
 624         u8 high = IWL_RATE_INVALID;
 625         u8 low = IWL_RATE_INVALID;
 626
 627         /* 802.11A or ht walks to the next literal adjacent rate in
 628          * the rate table */
 629         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 630                 int i;
 631                 u32 mask;
 632
 633                 /* Find the previous rate that is in the rate mask */
 634                 i = index - 1;
 635                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 636                         if (rate_mask & mask) {
 637                                 low = i;
 638                                 break;
 639                         }
 640                 }
 641
 642                 /* Find the next rate that is in the rate mask */
 643                 i = index + 1;
 644                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 645                         if (rate_mask & mask) {
 646                                 high = i;
 647                                 break;
 648                         }
 649                 }
 650
 651                 return (high << 8) | low;
 652         }
 653
 654         low = index;
 655         while (low != IWL_RATE_INVALID) {
 656                 low = iwl_rates[low].prev_rs;
 657                 if (low == IWL_RATE_INVALID)
 658                         break;
 659                 if (rate_mask & (1 << low))
 660                         break;
 661                 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
 662         }
 663
 664         high = index;
 665         while (high != IWL_RATE_INVALID) {
 666                 high = iwl_rates[high].next_rs;
 667                 if (high == IWL_RATE_INVALID)
 668                         break;
 669                 if (rate_mask & (1 << high))
 670                         break;
 671                 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
 672         }
 673
 674         return (high << 8) | low;
 675 }
 676
 677 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 678                              struct iwl_scale_tbl_info *tbl,
 679                              u8 scale_index, u8 ht_possible)
 680 {
 681         s32 low;
 682         u16 rate_mask;
 683         u16 high_low;
 684         u8 switch_to_legacy = 0;
 685         u8 is_green = lq_sta->is_green;
 686         struct iwl_priv *priv = lq_sta->drv;
 687
 688         /* check if we need to switch from HT to legacy rates.
 689          * assumption is that mandatory rates (1Mbps or 6Mbps)
 690          * are always supported (spec demand) */
 691         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 692                 switch_to_legacy = 1;
 693                 scale_index = rs_ht_to_legacy[scale_index];
 694                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 695                         tbl->lq_type = LQ_A;
 696                 else
 697                         tbl->lq_type = LQ_G;
 698
 699                 if (num_of_ant(tbl->ant_type) > 1)
 700                         tbl->ant_type =
 701                                 first_antenna(priv->hw_params.valid_tx_ant);
 702
 703                 tbl->is_ht40 = 0;
 704                 tbl->is_SGI = 0;
 705                 tbl->max_search = IWL_MAX_SEARCH;
 706         }
 707
 708         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 709
 710         /* Mask with station rate restriction */
 711         if (is_legacy(tbl->lq_type)) {
 712                 /* supp_rates has no CCK bits in A mode */
 713                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 714                         rate_mask  = (u16)(rate_mask &
 715                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 716                 else
 717                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 718         }
 719
 720         /* If we switched from HT to legacy, check current rate */
 721         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 722                 low = scale_index;
 723                 goto out;
 724         }
 725
 726         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 727                                         tbl->lq_type);
 728         low = high_low & 0xff;
 729
 730         if (low == IWL_RATE_INVALID)
 731                 low = scale_index;
 732
 733 out:
 734         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 735 }
 736
 737 /*
 738  * Simple function to compare two rate scale table types
 739  */
 740 static bool table_type_matches(struct iwl_scale_tbl_info *a,
 741                                struct iwl_scale_tbl_info *b)
 742 {
 743         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 744                 (a->is_SGI == b->is_SGI);
 745 }
 746
 747 /*
 748  * mac80211 sends us Tx status
 749  */
 750 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 751                          struct ieee80211_sta *sta, void *priv_sta,
 752                          struct sk_buff *skb)
 753 {
 754         int legacy_success;
 755         int retries;
 756         int rs_index, mac_index, i;
 757         struct iwl_lq_sta *lq_sta = priv_sta;
 758         struct iwl_link_quality_cmd *table;
 759         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 760         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
 761         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 762         enum mac80211_rate_control_flags mac_flags;
 763         u32 tx_rate;
 764         struct iwl_scale_tbl_info tbl_type;
 765         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 766
 767         IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
 768
 769         /* Treat uninitialized rate scaling data same as non-existing. */
 770         if (!lq_sta) {
 771                 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
 772                 return;
 773         } else if (!lq_sta->drv) {
 774                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
 775                 return;
 776         }
 777
 778         if (!ieee80211_is_data(hdr->frame_control) ||
 779             info->flags & IEEE80211_TX_CTL_NO_ACK)
 780                 return;
 781
 782         /* This packet was aggregated but doesn't carry status info */
 783         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 784             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 785                 return;
 786
 787         /*
 788          * Ignore this Tx frame response if its initial rate doesn't match
 789          * that of latest Link Quality command.  There may be stragglers
 790          * from a previous Link Quality command, but we're no longer interested
 791          * in those; they're either from the "active" mode while we're trying
 792          * to check "search" mode, or a prior "search" mode after we've moved
 793          * to a new "search" mode (which might become the new "active" mode).
 794          */
 795         table = &lq_sta->lq;
 796         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 797         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 798         if (priv->band == IEEE80211_BAND_5GHZ)
 799                 rs_index -= IWL_FIRST_OFDM_RATE;
 800         mac_flags = info->status.rates[0].flags;
 801         mac_index = info->status.rates[0].idx;
 802         /* For HT packets, map MCS to PLCP */
 803         if (mac_flags & IEEE80211_TX_RC_MCS) {
 804                 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
 805                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 806                         mac_index++;
 807                 /*
 808                  * mac80211 HT index is always zero-indexed; we need to move
 809                  * HT OFDM rates after CCK rates in 2.4 GHz band
 810                  */
 811                 if (priv->band == IEEE80211_BAND_2GHZ)
 812                         mac_index += IWL_FIRST_OFDM_RATE;
 813         }
 814         /* Here we actually compare this rate to the latest LQ command */
 815         if ((mac_index < 0) ||
 816             (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 817             (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 818             (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
 819             (tbl_type.ant_type != info->antenna_sel_tx) ||
 820             (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 821             (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 822             (rs_index != mac_index)) {
 823                 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
 824                 /*
 825                  * Since rates mis-match, the last LQ command may have failed.
 826                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 827                  * ... driver.
 828                  */
 829                 lq_sta->missed_rate_counter++;
 830                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 831                         lq_sta->missed_rate_counter = 0;
 832                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC, false);
 833                 }
 834                 /* Regardless, ignore this status info for outdated rate */
 835                 return;
 836         } else
 837                 /* Rate did match, so reset the missed_rate_counter */
 838                 lq_sta->missed_rate_counter = 0;
 839
 840         /* Figure out if rate scale algorithm is in active or search table */
 841         if (table_type_matches(&tbl_type,
 842                                 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 843                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 844                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 845         } else if (table_type_matches(&tbl_type,
 846                                 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
 847                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 848                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 849         } else {
 850                 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
 851                 return;
 852         }
 853
 854         /*
 855          * Updating the frame history depends on whether packets were
 856          * aggregated.
 857          *
 858          * For aggregation, all packets were transmitted at the same rate, the
 859          * first index into rate scale table.
 860          */
 861         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
 862                 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 863                 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
 864                                 &rs_index);
 865                 rs_collect_tx_data(curr_tbl, rs_index,
 866                                    info->status.ampdu_len,
 867                                    info->status.ampdu_ack_len);
 868
 869                 /* Update success/fail counts if not searching for new mode */
 870                 if (lq_sta->stay_in_tbl) {
 871                         lq_sta->total_success += info->status.ampdu_ack_len;
 872                         lq_sta->total_failed += (info->status.ampdu_len -
 873                                         info->status.ampdu_ack_len);
 874                 }
 875         } else {
 876         /*
 877          * For legacy, update frame history with for each Tx retry.
 878          */
 879                 retries = info->status.rates[0].count - 1;
 880                 /* HW doesn't send more than 15 retries */
 881                 retries = min(retries, 15);
 882
 883                 /* The last transmission may have been successful */
 884                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
 885                 /* Collect data for each rate used during failed TX attempts */
 886                 for (i = 0; i <= retries; ++i) {
 887                         tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
 888                         rs_get_tbl_info_from_mcs(tx_rate, priv->band,
 889                                         &tbl_type, &rs_index);
 890                         /*
 891                          * Only collect stats if retried rate is in the same RS
 892                          * table as active/search.
 893                          */
 894                         if (table_type_matches(&tbl_type, curr_tbl))
 895                                 tmp_tbl = curr_tbl;
 896                         else if (table_type_matches(&tbl_type, other_tbl))
 897                                 tmp_tbl = other_tbl;
 898                         else
 899                                 continue;
 900                         rs_collect_tx_data(tmp_tbl, rs_index, 1,
 901                                            i < retries ? 0 : legacy_success);
 902                 }
 903
 904                 /* Update success/fail counts if not searching for new mode */
 905                 if (lq_sta->stay_in_tbl) {
 906                         lq_sta->total_success += legacy_success;
 907                         lq_sta->total_failed += retries + (1 - legacy_success);
 908                 }
 909         }
 910         /* The last TX rate is cached in lq_sta; it's set in if/else above */
 911         lq_sta->last_rate_n_flags = tx_rate;
 912
 913         /* See if there's a better rate or modulation mode to try. */
 914         if (sta && sta->supp_rates[sband->band])
 915                 rs_rate_scale_perform(priv, skb, sta, lq_sta);
 916 }
 917
 918 /*
 919  * Begin a period of staying with a selected modulation mode.
 920  * Set "stay_in_tbl" flag to prevent any mode switches.
 921  * Set frame tx success limits according to legacy vs. high-throughput,
 922  * and reset overall (spanning all rates) tx success history statistics.
 923  * These control how long we stay using same modulation mode before
 924  * searching for a new mode.
 925  */
 926 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
 927                                  struct iwl_lq_sta *lq_sta)
 928 {
 929         IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
 930         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
 931         if (is_legacy) {
 932                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
 933                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
 934                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
 935         } else {
 936                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
 937                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
 938                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
 939         }
 940         lq_sta->table_count = 0;
 941         lq_sta->total_failed = 0;
 942         lq_sta->total_success = 0;
 943         lq_sta->flush_timer = jiffies;
 944         lq_sta->action_counter = 0;
 945 }
 946
 947 /*
 948  * Find correct throughput table for given mode of modulation
 949  */
 950 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
 951                                       struct iwl_scale_tbl_info *tbl)
 952 {
 953         /* Used to choose among HT tables */
 954         s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
 955
 956         /* Check for invalid LQ type */
 957         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
 958                 tbl->expected_tpt = expected_tpt_legacy;
 959                 return;
 960         }
 961
 962         /* Legacy rates have only one table */
 963         if (is_legacy(tbl->lq_type)) {
 964                 tbl->expected_tpt = expected_tpt_legacy;
 965                 return;
 966         }
 967
 968         /* Choose among many HT tables depending on number of streams
 969          * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
 970          * status */
 971         if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
 972                 ht_tbl_pointer = expected_tpt_siso20MHz;
 973         else if (is_siso(tbl->lq_type))
 974                 ht_tbl_pointer = expected_tpt_siso40MHz;
 975         else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
 976                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
 977         else if (is_mimo2(tbl->lq_type))
 978                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
 979         else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
 980                 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
 981         else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
 982                 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
 983
 984         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
 985                 tbl->expected_tpt = ht_tbl_pointer[0];
 986         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
 987                 tbl->expected_tpt = ht_tbl_pointer[1];
 988         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
 989                 tbl->expected_tpt = ht_tbl_pointer[2];
 990         else                                            /* AGG+SGI */
 991                 tbl->expected_tpt = ht_tbl_pointer[3];
 992 }
 993
 994 /*
 995  * Find starting rate for new "search" high-throughput mode of modulation.
 996  * Goal is to find lowest expected rate (under perfect conditions) that is
 997  * above the current measured throughput of "active" mode, to give new mode
 998  * a fair chance to prove itself without too many challenges.
 999  *
1000  * This gets called when transitioning to more aggressive modulation
1001  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1002  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1003  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1004  * bit rate will typically need to increase, but not if performance was bad.
1005  */
1006 static s32 rs_get_best_rate(struct iwl_priv *priv,
1007                             struct iwl_lq_sta *lq_sta,
1008                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1009                             u16 rate_mask, s8 index)
1010 {
1011         /* "active" values */
1012         struct iwl_scale_tbl_info *active_tbl =
1013             &(lq_sta->lq_info[lq_sta->active_tbl]);
1014         s32 active_sr = active_tbl->win[index].success_ratio;
1015         s32 active_tpt = active_tbl->expected_tpt[index];
1016
1017         /* expected "search" throughput */
1018         s32 *tpt_tbl = tbl->expected_tpt;
1019
1020         s32 new_rate, high, low, start_hi;
1021         u16 high_low;
1022         s8 rate = index;
1023
1024         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1025
1026         for (; ;) {
1027                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1028                                                 tbl->lq_type);
1029
1030                 low = high_low & 0xff;
1031                 high = (high_low >> 8) & 0xff;
1032
1033                 /*
1034                  * Lower the "search" bit rate, to give new "search" mode
1035                  * approximately the same throughput as "active" if:
1036                  *
1037                  * 1) "Active" mode has been working modestly well (but not
1038                  *    great), and expected "search" throughput (under perfect
1039                  *    conditions) at candidate rate is above the actual
1040                  *    measured "active" throughput (but less than expected
1041                  *    "active" throughput under perfect conditions).
1042                  * OR
1043                  * 2) "Active" mode has been working perfectly or very well
1044                  *    and expected "search" throughput (under perfect
1045                  *    conditions) at candidate rate is above expected
1046                  *    "active" throughput (under perfect conditions).
1047                  */
1048                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1049                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1050                       (active_sr <= IWL_RATE_HIGH_TH) &&
1051                       (tpt_tbl[rate] <= active_tpt))) ||
1052                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1053                      (tpt_tbl[rate] > active_tpt))) {
1054
1055                         /* (2nd or later pass)
1056                          * If we've already tried to raise the rate, and are
1057                          * now trying to lower it, use the higher rate. */
1058                         if (start_hi != IWL_RATE_INVALID) {
1059                                 new_rate = start_hi;
1060                                 break;
1061                         }
1062
1063                         new_rate = rate;
1064
1065                         /* Loop again with lower rate */
1066                         if (low != IWL_RATE_INVALID)
1067                                 rate = low;
1068
1069                         /* Lower rate not available, use the original */
1070                         else
1071                                 break;
1072
1073                 /* Else try to raise the "search" rate to match "active" */
1074                 } else {
1075                         /* (2nd or later pass)
1076                          * If we've already tried to lower the rate, and are
1077                          * now trying to raise it, use the lower rate. */
1078                         if (new_rate != IWL_RATE_INVALID)
1079                                 break;
1080
1081                         /* Loop again with higher rate */
1082                         else if (high != IWL_RATE_INVALID) {
1083                                 start_hi = high;
1084                                 rate = high;
1085
1086                         /* Higher rate not available, use the original */
1087                         } else {
1088                                 new_rate = rate;
1089                                 break;
1090                         }
1091                 }
1092         }
1093
1094         return new_rate;
1095 }
1096
1097 /*
1098  * Set up search table for MIMO2
1099  */
1100 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1101                              struct iwl_lq_sta *lq_sta,
1102                              struct ieee80211_conf *conf,
1103                              struct ieee80211_sta *sta,
1104                              struct iwl_scale_tbl_info *tbl, int index)
1105 {
1106         u16 rate_mask;
1107         s32 rate;
1108         s8 is_green = lq_sta->is_green;
1109
1110         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1111                 return -1;
1112
1113         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1114                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1115                 return -1;
1116
1117         /* Need both Tx chains/antennas to support MIMO */
1118         if (priv->hw_params.tx_chains_num < 2)
1119                 return -1;
1120
1121         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1122
1123         tbl->lq_type = LQ_MIMO2;
1124         tbl->is_dup = lq_sta->is_dup;
1125         tbl->action = 0;
1126         tbl->max_search = IWL_MAX_SEARCH;
1127         rate_mask = lq_sta->active_mimo2_rate;
1128
1129         if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1130                 tbl->is_ht40 = 1;
1131         else
1132                 tbl->is_ht40 = 0;
1133
1134         rs_set_expected_tpt_table(lq_sta, tbl);
1135
1136         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1137
1138         IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1139         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1140                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1141                                                 rate, rate_mask);
1142                 return -1;
1143         }
1144         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1145
1146         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1147                      tbl->current_rate, is_green);
1148         return 0;
1149 }
1150
1151 /*
1152  * Set up search table for MIMO3
1153  */
1154 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1155                              struct iwl_lq_sta *lq_sta,
1156                              struct ieee80211_conf *conf,
1157                              struct ieee80211_sta *sta,
1158                              struct iwl_scale_tbl_info *tbl, int index)
1159 {
1160         u16 rate_mask;
1161         s32 rate;
1162         s8 is_green = lq_sta->is_green;
1163
1164         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1165                 return -1;
1166
1167         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1168                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1169                 return -1;
1170
1171         /* Need both Tx chains/antennas to support MIMO */
1172         if (priv->hw_params.tx_chains_num < 3)
1173                 return -1;
1174
1175         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1176
1177         tbl->lq_type = LQ_MIMO3;
1178         tbl->is_dup = lq_sta->is_dup;
1179         tbl->action = 0;
1180         tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1181         rate_mask = lq_sta->active_mimo3_rate;
1182
1183         if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1184                 tbl->is_ht40 = 1;
1185         else
1186                 tbl->is_ht40 = 0;
1187
1188         rs_set_expected_tpt_table(lq_sta, tbl);
1189
1190         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1191
1192         IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1193                 rate, rate_mask);
1194         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1195                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1196                                                 rate, rate_mask);
1197                 return -1;
1198         }
1199         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1200
1201         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1202                      tbl->current_rate, is_green);
1203         return 0;
1204 }
1205
1206 /*
1207  * Set up search table for SISO
1208  */
1209 static int rs_switch_to_siso(struct iwl_priv *priv,
1210                              struct iwl_lq_sta *lq_sta,
1211                              struct ieee80211_conf *conf,
1212                              struct ieee80211_sta *sta,
1213                              struct iwl_scale_tbl_info *tbl, int index)
1214 {
1215         u16 rate_mask;
1216         u8 is_green = lq_sta->is_green;
1217         s32 rate;
1218
1219         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1220                 return -1;
1221
1222         IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1223
1224         tbl->is_dup = lq_sta->is_dup;
1225         tbl->lq_type = LQ_SISO;
1226         tbl->action = 0;
1227         tbl->max_search = IWL_MAX_SEARCH;
1228         rate_mask = lq_sta->active_siso_rate;
1229
1230         if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1231                 tbl->is_ht40 = 1;
1232         else
1233                 tbl->is_ht40 = 0;
1234
1235         if (is_green)
1236                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1237
1238         rs_set_expected_tpt_table(lq_sta, tbl);
1239         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1240
1241         IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1242         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1243                 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1244                              rate, rate_mask);
1245                 return -1;
1246         }
1247         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1248         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1249                      tbl->current_rate, is_green);
1250         return 0;
1251 }
1252
1253 /*
1254  * Try to switch to new modulation mode from legacy
1255  */
1256 static int rs_move_legacy_other(struct iwl_priv *priv,
1257                                 struct iwl_lq_sta *lq_sta,
1258                                 struct ieee80211_conf *conf,
1259                                 struct ieee80211_sta *sta,
1260                                 int index)
1261 {
1262         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1263         struct iwl_scale_tbl_info *search_tbl =
1264                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1265         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1266         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1267                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1268         u8 start_action = tbl->action;
1269         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1270         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1271         int ret = 0;
1272         u8 update_search_tbl_counter = 0;
1273
1274         if (!iwl_ht_enabled(priv))
1275                 /* stay in Legacy */
1276                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1277         else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1278                    tbl->action > IWL_LEGACY_SWITCH_SISO)
1279                 tbl->action = IWL_LEGACY_SWITCH_SISO;
1280         for (; ;) {
1281                 lq_sta->action_counter++;
1282                 switch (tbl->action) {
1283                 case IWL_LEGACY_SWITCH_ANTENNA1:
1284                 case IWL_LEGACY_SWITCH_ANTENNA2:
1285                         IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1286
1287                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1288                                                         tx_chains_num <= 1) ||
1289                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1290                                                         tx_chains_num <= 2))
1291                                 break;
1292
1293                         /* Don't change antenna if success has been great */
1294                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1295                                 break;
1296
1297                         /* Set up search table to try other antenna */
1298                         memcpy(search_tbl, tbl, sz);
1299
1300                         if (rs_toggle_antenna(valid_tx_ant,
1301                                 &search_tbl->current_rate, search_tbl)) {
1302                                 update_search_tbl_counter = 1;
1303                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1304                                 goto out;
1305                         }
1306                         break;
1307                 case IWL_LEGACY_SWITCH_SISO:
1308                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1309
1310                         /* Set up search table to try SISO */
1311                         memcpy(search_tbl, tbl, sz);
1312                         search_tbl->is_SGI = 0;
1313                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1314                                                  search_tbl, index);
1315                         if (!ret) {
1316                                 lq_sta->action_counter = 0;
1317                                 goto out;
1318                         }
1319
1320                         break;
1321                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1322                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1323                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1324                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1325
1326                         /* Set up search table to try MIMO */
1327                         memcpy(search_tbl, tbl, sz);
1328                         search_tbl->is_SGI = 0;
1329
1330                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1331                                 search_tbl->ant_type = ANT_AB;
1332                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1333                                 search_tbl->ant_type = ANT_AC;
1334                         else
1335                                 search_tbl->ant_type = ANT_BC;
1336
1337                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1338                                 break;
1339
1340                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1341                                                  search_tbl, index);
1342                         if (!ret) {
1343                                 lq_sta->action_counter = 0;
1344                                 goto out;
1345                         }
1346                         break;
1347
1348                 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1349                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1350
1351                         /* Set up search table to try MIMO3 */
1352                         memcpy(search_tbl, tbl, sz);
1353                         search_tbl->is_SGI = 0;
1354
1355                         search_tbl->ant_type = ANT_ABC;
1356
1357                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1358                                 break;
1359
1360                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1361                                                  search_tbl, index);
1362                         if (!ret) {
1363                                 lq_sta->action_counter = 0;
1364                                 goto out;
1365                         }
1366                         break;
1367                 }
1368                 tbl->action++;
1369                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1370                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1371
1372                 if (tbl->action == start_action)
1373                         break;
1374
1375         }
1376         search_tbl->lq_type = LQ_NONE;
1377         return 0;
1378
1379 out:
1380         lq_sta->search_better_tbl = 1;
1381         tbl->action++;
1382         if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1383                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1384         if (update_search_tbl_counter)
1385                 search_tbl->action = tbl->action;
1386         return 0;
1387
1388 }
1389
1390 /*
1391  * Try to switch to new modulation mode from SISO
1392  */
1393 static int rs_move_siso_to_other(struct iwl_priv *priv,
1394                                  struct iwl_lq_sta *lq_sta,
1395                                  struct ieee80211_conf *conf,
1396                                  struct ieee80211_sta *sta, int index)
1397 {
1398         u8 is_green = lq_sta->is_green;
1399         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1400         struct iwl_scale_tbl_info *search_tbl =
1401                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1402         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1403         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1404         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1405                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1406         u8 start_action = tbl->action;
1407         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1408         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1409         u8 update_search_tbl_counter = 0;
1410         int ret;
1411
1412         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1413             tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1414                 /* stay in SISO */
1415                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1416         }
1417         for (;;) {
1418                 lq_sta->action_counter++;
1419                 switch (tbl->action) {
1420                 case IWL_SISO_SWITCH_ANTENNA1:
1421                 case IWL_SISO_SWITCH_ANTENNA2:
1422                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1423
1424                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1425                                                         tx_chains_num <= 1) ||
1426                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1427                                                         tx_chains_num <= 2))
1428                                 break;
1429
1430                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1431                                 break;
1432
1433                         memcpy(search_tbl, tbl, sz);
1434                         if (rs_toggle_antenna(valid_tx_ant,
1435                                        &search_tbl->current_rate, search_tbl)) {
1436                                 update_search_tbl_counter = 1;
1437                                 goto out;
1438                         }
1439                         break;
1440                 case IWL_SISO_SWITCH_MIMO2_AB:
1441                 case IWL_SISO_SWITCH_MIMO2_AC:
1442                 case IWL_SISO_SWITCH_MIMO2_BC:
1443                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1444                         memcpy(search_tbl, tbl, sz);
1445                         search_tbl->is_SGI = 0;
1446
1447                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1448                                 search_tbl->ant_type = ANT_AB;
1449                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1450                                 search_tbl->ant_type = ANT_AC;
1451                         else
1452                                 search_tbl->ant_type = ANT_BC;
1453
1454                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1455                                 break;
1456
1457                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1458                                                  search_tbl, index);
1459                         if (!ret)
1460                                 goto out;
1461                         break;
1462                 case IWL_SISO_SWITCH_GI:
1463                         if (!tbl->is_ht40 && !(ht_cap->cap &
1464                                                 IEEE80211_HT_CAP_SGI_20))
1465                                 break;
1466                         if (tbl->is_ht40 && !(ht_cap->cap &
1467                                                 IEEE80211_HT_CAP_SGI_40))
1468                                 break;
1469
1470                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1471
1472                         memcpy(search_tbl, tbl, sz);
1473                         if (is_green) {
1474                                 if (!tbl->is_SGI)
1475                                         break;
1476                                 else
1477                                         IWL_ERR(priv,
1478                                                 "SGI was set in GF+SISO\n");
1479                         }
1480                         search_tbl->is_SGI = !tbl->is_SGI;
1481                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1482                         if (tbl->is_SGI) {
1483                                 s32 tpt = lq_sta->last_tpt / 100;
1484                                 if (tpt >= search_tbl->expected_tpt[index])
1485                                         break;
1486                         }
1487                         search_tbl->current_rate =
1488                                 rate_n_flags_from_tbl(priv, search_tbl,
1489                                                       index, is_green);
1490                         update_search_tbl_counter = 1;
1491                         goto out;
1492                 case IWL_SISO_SWITCH_MIMO3_ABC:
1493                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1494                         memcpy(search_tbl, tbl, sz);
1495                         search_tbl->is_SGI = 0;
1496                         search_tbl->ant_type = ANT_ABC;
1497
1498                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1499                                 break;
1500
1501                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1502                                                  search_tbl, index);
1503                         if (!ret)
1504                                 goto out;
1505                         break;
1506                 }
1507                 tbl->action++;
1508                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1509                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1510
1511                 if (tbl->action == start_action)
1512                         break;
1513         }
1514         search_tbl->lq_type = LQ_NONE;
1515         return 0;
1516
1517  out:
1518         lq_sta->search_better_tbl = 1;
1519         tbl->action++;
1520         if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1521                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1522         if (update_search_tbl_counter)
1523                 search_tbl->action = tbl->action;
1524
1525         return 0;
1526 }
1527
1528 /*
1529  * Try to switch to new modulation mode from MIMO2
1530  */
1531 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1532                                  struct iwl_lq_sta *lq_sta,
1533                                  struct ieee80211_conf *conf,
1534                                  struct ieee80211_sta *sta, int index)
1535 {
1536         s8 is_green = lq_sta->is_green;
1537         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1538         struct iwl_scale_tbl_info *search_tbl =
1539                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1540         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1541         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1542         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1543                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1544         u8 start_action = tbl->action;
1545         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1546         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1547         u8 update_search_tbl_counter = 0;
1548         int ret;
1549
1550         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1551             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1552              tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1553                 /* switch in SISO */
1554                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1555         }
1556         for (;;) {
1557                 lq_sta->action_counter++;
1558                 switch (tbl->action) {
1559                 case IWL_MIMO2_SWITCH_ANTENNA1:
1560                 case IWL_MIMO2_SWITCH_ANTENNA2:
1561                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1562
1563                         if (tx_chains_num <= 2)
1564                                 break;
1565
1566                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1567                                 break;
1568
1569                         memcpy(search_tbl, tbl, sz);
1570                         if (rs_toggle_antenna(valid_tx_ant,
1571                                        &search_tbl->current_rate, search_tbl)) {
1572                                 update_search_tbl_counter = 1;
1573                                 goto out;
1574                         }
1575                         break;
1576                 case IWL_MIMO2_SWITCH_SISO_A:
1577                 case IWL_MIMO2_SWITCH_SISO_B:
1578                 case IWL_MIMO2_SWITCH_SISO_C:
1579                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1580
1581                         /* Set up new search table for SISO */
1582                         memcpy(search_tbl, tbl, sz);
1583
1584                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1585                                 search_tbl->ant_type = ANT_A;
1586                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1587                                 search_tbl->ant_type = ANT_B;
1588                         else
1589                                 search_tbl->ant_type = ANT_C;
1590
1591                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1592                                 break;
1593
1594                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1595                                                  search_tbl, index);
1596                         if (!ret)
1597                                 goto out;
1598
1599                         break;
1600
1601                 case IWL_MIMO2_SWITCH_GI:
1602                         if (!tbl->is_ht40 && !(ht_cap->cap &
1603                                                 IEEE80211_HT_CAP_SGI_20))
1604                                 break;
1605                         if (tbl->is_ht40 && !(ht_cap->cap &
1606                                                 IEEE80211_HT_CAP_SGI_40))
1607                                 break;
1608
1609                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1610
1611                         /* Set up new search table for MIMO2 */
1612                         memcpy(search_tbl, tbl, sz);
1613                         search_tbl->is_SGI = !tbl->is_SGI;
1614                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1615                         /*
1616                          * If active table already uses the fastest possible
1617                          * modulation (dual stream with short guard interval),
1618                          * and it's working well, there's no need to look
1619                          * for a better type of modulation!
1620                          */
1621                         if (tbl->is_SGI) {
1622                                 s32 tpt = lq_sta->last_tpt / 100;
1623                                 if (tpt >= search_tbl->expected_tpt[index])
1624                                         break;
1625                         }
1626                         search_tbl->current_rate =
1627                                 rate_n_flags_from_tbl(priv, search_tbl,
1628                                                       index, is_green);
1629                         update_search_tbl_counter = 1;
1630                         goto out;
1631
1632                 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1633                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1634                         memcpy(search_tbl, tbl, sz);
1635                         search_tbl->is_SGI = 0;
1636                         search_tbl->ant_type = ANT_ABC;
1637
1638                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1639                                 break;
1640
1641                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1642                                                  search_tbl, index);
1643                         if (!ret)
1644                                 goto out;
1645
1646                         break;
1647                 }
1648                 tbl->action++;
1649                 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1650                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1651
1652                 if (tbl->action == start_action)
1653                         break;
1654         }
1655         search_tbl->lq_type = LQ_NONE;
1656         return 0;
1657  out:
1658         lq_sta->search_better_tbl = 1;
1659         tbl->action++;
1660         if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1661                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1662         if (update_search_tbl_counter)
1663                 search_tbl->action = tbl->action;
1664
1665         return 0;
1666
1667 }
1668
1669 /*
1670  * Try to switch to new modulation mode from MIMO3
1671  */
1672 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1673                                  struct iwl_lq_sta *lq_sta,
1674                                  struct ieee80211_conf *conf,
1675                                  struct ieee80211_sta *sta, int index)
1676 {
1677         s8 is_green = lq_sta->is_green;
1678         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1679         struct iwl_scale_tbl_info *search_tbl =
1680                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1681         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1682         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1683         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1684                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1685         u8 start_action = tbl->action;
1686         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1687         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1688         int ret;
1689         u8 update_search_tbl_counter = 0;
1690
1691         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1692             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1693              tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1694                 /* switch in SISO */
1695                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1696         }
1697         for (;;) {
1698                 lq_sta->action_counter++;
1699                 switch (tbl->action) {
1700                 case IWL_MIMO3_SWITCH_ANTENNA1:
1701                 case IWL_MIMO3_SWITCH_ANTENNA2:
1702                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1703
1704                         if (tx_chains_num <= 3)
1705                                 break;
1706
1707                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1708                                 break;
1709
1710                         memcpy(search_tbl, tbl, sz);
1711                         if (rs_toggle_antenna(valid_tx_ant,
1712                                        &search_tbl->current_rate, search_tbl))
1713                                 goto out;
1714                         break;
1715                 case IWL_MIMO3_SWITCH_SISO_A:
1716                 case IWL_MIMO3_SWITCH_SISO_B:
1717                 case IWL_MIMO3_SWITCH_SISO_C:
1718                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1719
1720                         /* Set up new search table for SISO */
1721                         memcpy(search_tbl, tbl, sz);
1722
1723                         if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1724                                 search_tbl->ant_type = ANT_A;
1725                         else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1726                                 search_tbl->ant_type = ANT_B;
1727                         else
1728                                 search_tbl->ant_type = ANT_C;
1729
1730                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1731                                 break;
1732
1733                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1734                                                  search_tbl, index);
1735                         if (!ret)
1736                                 goto out;
1737
1738                         break;
1739
1740                 case IWL_MIMO3_SWITCH_MIMO2_AB:
1741                 case IWL_MIMO3_SWITCH_MIMO2_AC:
1742                 case IWL_MIMO3_SWITCH_MIMO2_BC:
1743                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1744
1745                         memcpy(search_tbl, tbl, sz);
1746                         search_tbl->is_SGI = 0;
1747                         if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1748                                 search_tbl->ant_type = ANT_AB;
1749                         else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1750                                 search_tbl->ant_type = ANT_AC;
1751                         else
1752                                 search_tbl->ant_type = ANT_BC;
1753
1754                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1755                                 break;
1756
1757                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1758                                                  search_tbl, index);
1759                         if (!ret)
1760                                 goto out;
1761
1762                         break;
1763
1764                 case IWL_MIMO3_SWITCH_GI:
1765                         if (!tbl->is_ht40 && !(ht_cap->cap &
1766                                                 IEEE80211_HT_CAP_SGI_20))
1767                                 break;
1768                         if (tbl->is_ht40 && !(ht_cap->cap &
1769                                                 IEEE80211_HT_CAP_SGI_40))
1770                                 break;
1771
1772                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1773
1774                         /* Set up new search table for MIMO */
1775                         memcpy(search_tbl, tbl, sz);
1776                         search_tbl->is_SGI = !tbl->is_SGI;
1777                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1778                         /*
1779                          * If active table already uses the fastest possible
1780                          * modulation (dual stream with short guard interval),
1781                          * and it's working well, there's no need to look
1782                          * for a better type of modulation!
1783                          */
1784                         if (tbl->is_SGI) {
1785                                 s32 tpt = lq_sta->last_tpt / 100;
1786                                 if (tpt >= search_tbl->expected_tpt[index])
1787                                         break;
1788                         }
1789                         search_tbl->current_rate =
1790                                 rate_n_flags_from_tbl(priv, search_tbl,
1791                                                       index, is_green);
1792                         update_search_tbl_counter = 1;
1793                         goto out;
1794                 }
1795                 tbl->action++;
1796                 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1797                         tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1798
1799                 if (tbl->action == start_action)
1800                         break;
1801         }
1802         search_tbl->lq_type = LQ_NONE;
1803         return 0;
1804  out:
1805         lq_sta->search_better_tbl = 1;
1806         tbl->action++;
1807         if (tbl->action > IWL_MIMO3_SWITCH_GI)
1808                 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1809         if (update_search_tbl_counter)
1810                 search_tbl->action = tbl->action;
1811
1812         return 0;
1813
1814 }
1815
1816 /*
1817  * Check whether we should continue using same modulation mode, or
1818  * begin search for a new mode, based on:
1819  * 1) # tx successes or failures while using this mode
1820  * 2) # times calling this function
1821  * 3) elapsed time in this mode (not used, for now)
1822  */
1823 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1824 {
1825         struct iwl_scale_tbl_info *tbl;
1826         int i;
1827         int active_tbl;
1828         int flush_interval_passed = 0;
1829         struct iwl_priv *priv;
1830
1831         priv = lq_sta->drv;
1832         active_tbl = lq_sta->active_tbl;
1833
1834         tbl = &(lq_sta->lq_info[active_tbl]);
1835
1836         /* If we've been disallowing search, see if we should now allow it */
1837         if (lq_sta->stay_in_tbl) {
1838
1839                 /* Elapsed time using current modulation mode */
1840                 if (lq_sta->flush_timer)
1841                         flush_interval_passed =
1842                         time_after(jiffies,
1843                                         (unsigned long)(lq_sta->flush_timer +
1844                                         IWL_RATE_SCALE_FLUSH_INTVL));
1845
1846                 /*
1847                  * Check if we should allow search for new modulation mode.
1848                  * If many frames have failed or succeeded, or we've used
1849                  * this same modulation for a long time, allow search, and
1850                  * reset history stats that keep track of whether we should
1851                  * allow a new search.  Also (below) reset all bitmaps and
1852                  * stats in active history.
1853                  */
1854                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1855                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1856                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1857                      && (flush_interval_passed))) {
1858                         IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
1859                                      lq_sta->total_failed,
1860                                      lq_sta->total_success,
1861                                      flush_interval_passed);
1862
1863                         /* Allow search for new mode */
1864                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1865                         lq_sta->total_failed = 0;
1866                         lq_sta->total_success = 0;
1867                         lq_sta->flush_timer = 0;
1868
1869                 /*
1870                  * Else if we've used this modulation mode enough repetitions
1871                  * (regardless of elapsed time or success/failure), reset
1872                  * history bitmaps and rate-specific stats for all rates in
1873                  * active table.
1874                  */
1875                 } else {
1876                         lq_sta->table_count++;
1877                         if (lq_sta->table_count >=
1878                             lq_sta->table_count_limit) {
1879                                 lq_sta->table_count = 0;
1880
1881                                 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
1882                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1883                                         rs_rate_scale_clear_window(
1884                                                 &(tbl->win[i]));
1885                         }
1886                 }
1887
1888                 /* If transitioning to allow "search", reset all history
1889                  * bitmaps and stats in active table (this will become the new
1890                  * "search" table). */
1891                 if (!lq_sta->stay_in_tbl) {
1892                         for (i = 0; i < IWL_RATE_COUNT; i++)
1893                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1894                 }
1895         }
1896 }
1897
1898 /*
1899  * setup rate table in uCode
1900  * return rate_n_flags as used in the table
1901  */
1902 static u32 rs_update_rate_tbl(struct iwl_priv *priv,
1903                                 struct iwl_lq_sta *lq_sta,
1904                                 struct iwl_scale_tbl_info *tbl,
1905                                 int index, u8 is_green)
1906 {
1907         u32 rate;
1908
1909         /* Update uCode's rate table. */
1910         rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
1911         rs_fill_link_cmd(priv, lq_sta, rate);
1912         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC, false);
1913
1914         return rate;
1915 }
1916
1917 /*
1918  * Do rate scaling and search for new modulation mode.
1919  */
1920 static void rs_rate_scale_perform(struct iwl_priv *priv,
1921                                   struct sk_buff *skb,
1922                                   struct ieee80211_sta *sta,
1923                                   struct iwl_lq_sta *lq_sta)
1924 {
1925         struct ieee80211_hw *hw = priv->hw;
1926         struct ieee80211_conf *conf = &hw->conf;
1927         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1928         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1929         int low = IWL_RATE_INVALID;
1930         int high = IWL_RATE_INVALID;
1931         int index;
1932         int i;
1933         struct iwl_rate_scale_data *window = NULL;
1934         int current_tpt = IWL_INVALID_VALUE;
1935         int low_tpt = IWL_INVALID_VALUE;
1936         int high_tpt = IWL_INVALID_VALUE;
1937         u32 fail_count;
1938         s8 scale_action = 0;
1939         u16 rate_mask;
1940         u8 update_lq = 0;
1941         struct iwl_scale_tbl_info *tbl, *tbl1;
1942         u16 rate_scale_index_msk = 0;
1943         u32 rate;
1944         u8 is_green = 0;
1945         u8 active_tbl = 0;
1946         u8 done_search = 0;
1947         u16 high_low;
1948         s32 sr;
1949         u8 tid = MAX_TID_COUNT;
1950         struct iwl_tid_data *tid_data;
1951
1952         IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
1953
1954         /* Send management frames and NO_ACK data using lowest rate. */
1955         /* TODO: this could probably be improved.. */
1956         if (!ieee80211_is_data(hdr->frame_control) ||
1957             info->flags & IEEE80211_TX_CTL_NO_ACK)
1958                 return;
1959
1960         if (!sta || !lq_sta)
1961                 return;
1962
1963         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1964
1965         tid = rs_tl_add_packet(lq_sta, hdr);
1966         if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1967                 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
1968                 if (tid_data->agg.state == IWL_AGG_OFF)
1969                         lq_sta->is_agg = 0;
1970                 else
1971                         lq_sta->is_agg = 1;
1972         } else
1973                 lq_sta->is_agg = 0;
1974
1975         /*
1976          * Select rate-scale / modulation-mode table to work with in
1977          * the rest of this function:  "search" if searching for better
1978          * modulation mode, or "active" if doing rate scaling within a mode.
1979          */
1980         if (!lq_sta->search_better_tbl)
1981                 active_tbl = lq_sta->active_tbl;
1982         else
1983                 active_tbl = 1 - lq_sta->active_tbl;
1984
1985         tbl = &(lq_sta->lq_info[active_tbl]);
1986         if (is_legacy(tbl->lq_type))
1987                 lq_sta->is_green = 0;
1988         else
1989                 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
1990         is_green = lq_sta->is_green;
1991
1992         /* current tx rate */
1993         index = lq_sta->last_txrate_idx;
1994
1995         IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
1996                        tbl->lq_type);
1997
1998         /* rates available for this association, and for modulation mode */
1999         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2000
2001         IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2002
2003         /* mask with station rate restriction */
2004         if (is_legacy(tbl->lq_type)) {
2005                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2006                         /* supp_rates has no CCK bits in A mode */
2007                         rate_scale_index_msk = (u16) (rate_mask &
2008                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2009                 else
2010                         rate_scale_index_msk = (u16) (rate_mask &
2011                                                       lq_sta->supp_rates);
2012
2013         } else
2014                 rate_scale_index_msk = rate_mask;
2015
2016         if (!rate_scale_index_msk)
2017                 rate_scale_index_msk = rate_mask;
2018
2019         if (!((1 << index) & rate_scale_index_msk)) {
2020                 IWL_ERR(priv, "Current Rate is not valid\n");
2021                 if (lq_sta->search_better_tbl) {
2022                         /* revert to active table if search table is not valid*/
2023                         tbl->lq_type = LQ_NONE;
2024                         lq_sta->search_better_tbl = 0;
2025                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2026                         /* get "active" rate info */
2027                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2028                         rate = rs_update_rate_tbl(priv, lq_sta,
2029                                                   tbl, index, is_green);
2030                 }
2031                 return;
2032         }
2033
2034         /* Get expected throughput table and history window for current rate */
2035         if (!tbl->expected_tpt) {
2036                 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2037                 return;
2038         }
2039
2040         /* force user max rate if set by user */
2041         if ((lq_sta->max_rate_idx != -1) &&
2042             (lq_sta->max_rate_idx < index)) {
2043                 index = lq_sta->max_rate_idx;
2044                 update_lq = 1;
2045                 window = &(tbl->win[index]);
2046                 goto lq_update;
2047         }
2048
2049         window = &(tbl->win[index]);
2050
2051         /*
2052          * If there is not enough history to calculate actual average
2053          * throughput, keep analyzing results of more tx frames, without
2054          * changing rate or mode (bypass most of the rest of this function).
2055          * Set up new rate table in uCode only if old rate is not supported
2056          * in current association (use new rate found above).
2057          */
2058         fail_count = window->counter - window->success_counter;
2059         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2060                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2061                 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2062                                "for index %d\n",
2063                                window->success_counter, window->counter, index);
2064
2065                 /* Can't calculate this yet; not enough history */
2066                 window->average_tpt = IWL_INVALID_VALUE;
2067
2068                 /* Should we stay with this modulation mode,
2069                  * or search for a new one? */
2070                 rs_stay_in_table(lq_sta);
2071
2072                 goto out;
2073         }
2074         /* Else we have enough samples; calculate estimate of
2075          * actual average throughput */
2076         if (window->average_tpt != ((window->success_ratio *
2077                         tbl->expected_tpt[index] + 64) / 128)) {
2078                 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2079                 window->average_tpt = ((window->success_ratio *
2080                                         tbl->expected_tpt[index] + 64) / 128);
2081         }
2082
2083         /* If we are searching for better modulation mode, check success. */
2084         if (lq_sta->search_better_tbl &&
2085             (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2086                 /* If good success, continue using the "search" mode;
2087                  * no need to send new link quality command, since we're
2088                  * continuing to use the setup that we've been trying. */
2089                 if (window->average_tpt > lq_sta->last_tpt) {
2090
2091                         IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2092                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2093                                         window->success_ratio,
2094                                         window->average_tpt,
2095                                         lq_sta->last_tpt);
2096
2097                         if (!is_legacy(tbl->lq_type))
2098                                 lq_sta->enable_counter = 1;
2099
2100                         /* Swap tables; "search" becomes "active" */
2101                         lq_sta->active_tbl = active_tbl;
2102                         current_tpt = window->average_tpt;
2103
2104                 /* Else poor success; go back to mode in "active" table */
2105                 } else {
2106
2107                         IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2108                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2109                                         window->success_ratio,
2110                                         window->average_tpt,
2111                                         lq_sta->last_tpt);
2112
2113                         /* Nullify "search" table */
2114                         tbl->lq_type = LQ_NONE;
2115
2116                         /* Revert to "active" table */
2117                         active_tbl = lq_sta->active_tbl;
2118                         tbl = &(lq_sta->lq_info[active_tbl]);
2119
2120                         /* Revert to "active" rate and throughput info */
2121                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2122                         current_tpt = lq_sta->last_tpt;
2123
2124                         /* Need to set up a new rate table in uCode */
2125                         update_lq = 1;
2126                 }
2127
2128                 /* Either way, we've made a decision; modulation mode
2129                  * search is done, allow rate adjustment next time. */
2130                 lq_sta->search_better_tbl = 0;
2131                 done_search = 1;        /* Don't switch modes below! */
2132                 goto lq_update;
2133         }
2134
2135         /* (Else) not in search of better modulation mode, try for better
2136          * starting rate, while staying in this mode. */
2137         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2138                                         tbl->lq_type);
2139         low = high_low & 0xff;
2140         high = (high_low >> 8) & 0xff;
2141
2142         /* If user set max rate, dont allow higher than user constrain */
2143         if ((lq_sta->max_rate_idx != -1) &&
2144             (lq_sta->max_rate_idx < high))
2145                 high = IWL_RATE_INVALID;
2146
2147         sr = window->success_ratio;
2148
2149         /* Collect measured throughputs for current and adjacent rates */
2150         current_tpt = window->average_tpt;
2151         if (low != IWL_RATE_INVALID)
2152                 low_tpt = tbl->win[low].average_tpt;
2153         if (high != IWL_RATE_INVALID)
2154                 high_tpt = tbl->win[high].average_tpt;
2155
2156         scale_action = 0;
2157
2158         /* Too many failures, decrease rate */
2159         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2160                 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2161                 scale_action = -1;
2162
2163         /* No throughput measured yet for adjacent rates; try increase. */
2164         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2165                    (high_tpt == IWL_INVALID_VALUE)) {
2166
2167                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2168                         scale_action = 1;
2169                 else if (low != IWL_RATE_INVALID)
2170                         scale_action = 0;
2171         }
2172
2173         /* Both adjacent throughputs are measured, but neither one has better
2174          * throughput; we're using the best rate, don't change it! */
2175         else if ((low_tpt != IWL_INVALID_VALUE) &&
2176                  (high_tpt != IWL_INVALID_VALUE) &&
2177                  (low_tpt < current_tpt) &&
2178                  (high_tpt < current_tpt))
2179                 scale_action = 0;
2180
2181         /* At least one adjacent rate's throughput is measured,
2182          * and may have better performance. */
2183         else {
2184                 /* Higher adjacent rate's throughput is measured */
2185                 if (high_tpt != IWL_INVALID_VALUE) {
2186                         /* Higher rate has better throughput */
2187                         if (high_tpt > current_tpt &&
2188                                         sr >= IWL_RATE_INCREASE_TH) {
2189                                 scale_action = 1;
2190                         } else {
2191                                 scale_action = 0;
2192                         }
2193
2194                 /* Lower adjacent rate's throughput is measured */
2195                 } else if (low_tpt != IWL_INVALID_VALUE) {
2196                         /* Lower rate has better throughput */
2197                         if (low_tpt > current_tpt) {
2198                                 IWL_DEBUG_RATE(priv,
2199                                     "decrease rate because of low tpt\n");
2200                                 scale_action = -1;
2201                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2202                                 scale_action = 1;
2203                         }
2204                 }
2205         }
2206
2207         /* Sanity check; asked for decrease, but success rate or throughput
2208          * has been good at old rate.  Don't change it. */
2209         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2210                     ((sr > IWL_RATE_HIGH_TH) ||
2211                      (current_tpt > (100 * tbl->expected_tpt[low]))))
2212                 scale_action = 0;
2213         if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2214                 scale_action = -1;
2215         if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2216                 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2217                 scale_action = -1;
2218         switch (scale_action) {
2219         case -1:
2220                 /* Decrease starting rate, update uCode's rate table */
2221                 if (low != IWL_RATE_INVALID) {
2222                         update_lq = 1;
2223                         index = low;
2224                 }
2225
2226                 break;
2227         case 1:
2228                 /* Increase starting rate, update uCode's rate table */
2229                 if (high != IWL_RATE_INVALID) {
2230                         update_lq = 1;
2231                         index = high;
2232                 }
2233
2234                 break;
2235         case 0:
2236                 /* No change */
2237         default:
2238                 break;
2239         }
2240
2241         IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2242                     "high %d type %d\n",
2243                      index, scale_action, low, high, tbl->lq_type);
2244
2245 lq_update:
2246         /* Replace uCode's rate table for the destination station. */
2247         if (update_lq)
2248                 rate = rs_update_rate_tbl(priv, lq_sta,
2249                                           tbl, index, is_green);
2250
2251         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2252                 /* Should we stay with this modulation mode,
2253                  * or search for a new one? */
2254                 rs_stay_in_table(lq_sta);
2255         }
2256         /*
2257          * Search for new modulation mode if we're:
2258          * 1)  Not changing rates right now
2259          * 2)  Not just finishing up a search
2260          * 3)  Allowing a new search
2261          */
2262         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2263                 /* Save current throughput to compare with "search" throughput*/
2264                 lq_sta->last_tpt = current_tpt;
2265
2266                 /* Select a new "search" modulation mode to try.
2267                  * If one is found, set up the new "search" table. */
2268                 if (is_legacy(tbl->lq_type))
2269                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2270                 else if (is_siso(tbl->lq_type))
2271                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2272                 else if (is_mimo2(tbl->lq_type))
2273                         rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2274                 else
2275                         rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2276
2277                 /* If new "search" mode was selected, set up in uCode table */
2278                 if (lq_sta->search_better_tbl) {
2279                         /* Access the "search" table, clear its history. */
2280                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2281                         for (i = 0; i < IWL_RATE_COUNT; i++)
2282                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2283
2284                         /* Use new "search" start rate */
2285                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2286
2287                         IWL_DEBUG_RATE(priv, "Switch current  mcs: %X index: %d\n",
2288                                      tbl->current_rate, index);
2289                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2290                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC, false);
2291                 } else
2292                         done_search = 1;
2293         }
2294
2295         if (done_search && !lq_sta->stay_in_tbl) {
2296                 /* If the "active" (non-search) mode was legacy,
2297                  * and we've tried switching antennas,
2298                  * but we haven't been able to try HT modes (not available),
2299                  * stay with best antenna legacy modulation for a while
2300                  * before next round of mode comparisons. */
2301                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2302                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2303                     lq_sta->action_counter > tbl1->max_search) {
2304                         IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2305                         rs_set_stay_in_table(priv, 1, lq_sta);
2306                 }
2307
2308                 /* If we're in an HT mode, and all 3 mode switch actions
2309                  * have been tried and compared, stay in this best modulation
2310                  * mode for a while before next round of mode comparisons. */
2311                 if (lq_sta->enable_counter &&
2312                     (lq_sta->action_counter >= tbl1->max_search) &&
2313                     iwl_ht_enabled(priv)) {
2314                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2315                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2316                             (tid != MAX_TID_COUNT)) {
2317                                 tid_data =
2318                                    &priv->stations[lq_sta->lq.sta_id].tid[tid];
2319                                 if (tid_data->agg.state == IWL_AGG_OFF) {
2320                                         IWL_DEBUG_RATE(priv,
2321                                                        "try to aggregate tid %d\n",
2322                                                        tid);
2323                                         rs_tl_turn_on_agg(priv, tid,
2324                                                           lq_sta, sta);
2325                                 }
2326                         }
2327                         rs_set_stay_in_table(priv, 0, lq_sta);
2328                 }
2329         }
2330
2331 out:
2332         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2333         i = index;
2334         lq_sta->last_txrate_idx = i;
2335 }
2336
2337 /**
2338  * rs_initialize_lq - Initialize a station's hardware rate table
2339  *
2340  * The uCode's station table contains a table of fallback rates
2341  * for automatic fallback during transmission.
2342  *
2343  * NOTE: This sets up a default set of values.  These will be replaced later
2344  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2345  *       rc80211_simple.
2346  *
2347  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2348  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2349  *       which requires station table entry to exist).
2350  */
2351 static void rs_initialize_lq(struct iwl_priv *priv,
2352                              struct ieee80211_conf *conf,
2353                              struct ieee80211_sta *sta,
2354                              struct iwl_lq_sta *lq_sta)
2355 {
2356         struct iwl_scale_tbl_info *tbl;
2357         int rate_idx;
2358         int i;
2359         u32 rate;
2360         u8 use_green = rs_use_green(sta, &priv->current_ht_config);
2361         u8 active_tbl = 0;
2362         u8 valid_tx_ant;
2363
2364         if (!sta || !lq_sta)
2365                 goto out;
2366
2367         i = lq_sta->last_txrate_idx;
2368
2369         valid_tx_ant = priv->hw_params.valid_tx_ant;
2370
2371         if (!lq_sta->search_better_tbl)
2372                 active_tbl = lq_sta->active_tbl;
2373         else
2374                 active_tbl = 1 - lq_sta->active_tbl;
2375
2376         tbl = &(lq_sta->lq_info[active_tbl]);
2377
2378         if ((i < 0) || (i >= IWL_RATE_COUNT))
2379                 i = 0;
2380
2381         rate = iwl_rates[i].plcp;
2382         tbl->ant_type = first_antenna(valid_tx_ant);
2383         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2384
2385         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2386                 rate |= RATE_MCS_CCK_MSK;
2387
2388         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2389         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2390             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2391
2392         rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2393         tbl->current_rate = rate;
2394         rs_set_expected_tpt_table(lq_sta, tbl);
2395         rs_fill_link_cmd(NULL, lq_sta, rate);
2396         priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2397         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_SYNC, true);
2398  out:
2399         return;
2400 }
2401
2402 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2403                         struct ieee80211_tx_rate_control *txrc)
2404 {
2405
2406         struct sk_buff *skb = txrc->skb;
2407         struct ieee80211_supported_band *sband = txrc->sband;
2408         struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2409         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2410         struct iwl_lq_sta *lq_sta = priv_sta;
2411         int rate_idx;
2412
2413         IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2414
2415         /* Get max rate if user set max rate */
2416         if (lq_sta) {
2417                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2418                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2419                     (lq_sta->max_rate_idx != -1))
2420                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2421                 if ((lq_sta->max_rate_idx < 0) ||
2422                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2423                         lq_sta->max_rate_idx = -1;
2424         }
2425
2426         /* Treat uninitialized rate scaling data same as non-existing. */
2427         if (lq_sta && !lq_sta->drv) {
2428                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2429                 priv_sta = NULL;
2430         }
2431
2432         /* Send management frames and NO_ACK data using lowest rate. */
2433         if (rate_control_send_low(sta, priv_sta, txrc))
2434                 return;
2435
2436         rate_idx  = lq_sta->last_txrate_idx;
2437
2438         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2439                 rate_idx -= IWL_FIRST_OFDM_RATE;
2440                 /* 6M and 9M shared same MCS index */
2441                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2442                 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2443                     IWL_RATE_MIMO3_6M_PLCP)
2444                         rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2445                 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2446                          IWL_RATE_MIMO2_6M_PLCP)
2447                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2448                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2449                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2450                         info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2451                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2452                         info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2453                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2454                         info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2455                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2456                         info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2457         } else {
2458                 /* Check for invalid rates */
2459                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2460                                 ((sband->band == IEEE80211_BAND_5GHZ) &&
2461                                  (rate_idx < IWL_FIRST_OFDM_RATE)))
2462                         rate_idx = rate_lowest_index(sband, sta);
2463                 /* On valid 5 GHz rate, adjust index */
2464                 else if (sband->band == IEEE80211_BAND_5GHZ)
2465                         rate_idx -= IWL_FIRST_OFDM_RATE;
2466                 info->control.rates[0].flags = 0;
2467         }
2468         info->control.rates[0].idx = rate_idx;
2469
2470 }
2471
2472 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2473                           gfp_t gfp)
2474 {
2475         struct iwl_lq_sta *lq_sta;
2476         struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2477         struct iwl_priv *priv;
2478
2479         priv = (struct iwl_priv *)priv_rate;
2480         IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2481
2482         lq_sta = &sta_priv->lq_sta;
2483
2484         return lq_sta;
2485 }
2486
2487 /*
2488  * Called after adding a new station to initialize rate scaling
2489  */
2490 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2491 {
2492         int i, j;
2493         struct ieee80211_hw *hw = priv->hw;
2494         struct ieee80211_conf *conf = &priv->hw->conf;
2495         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2496         struct iwl_station_priv *sta_priv;
2497         struct iwl_lq_sta *lq_sta;
2498         struct ieee80211_supported_band *sband;
2499
2500         sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2501         lq_sta = &sta_priv->lq_sta;
2502         sband = hw->wiphy->bands[conf->channel->band];
2503
2504
2505         lq_sta->lq.sta_id = sta_id;
2506
2507         for (j = 0; j < LQ_SIZE; j++)
2508                 for (i = 0; i < IWL_RATE_COUNT; i++)
2509                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2510
2511         lq_sta->flush_timer = 0;
2512         lq_sta->supp_rates = sta->supp_rates[sband->band];
2513         for (j = 0; j < LQ_SIZE; j++)
2514                 for (i = 0; i < IWL_RATE_COUNT; i++)
2515                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2516
2517         IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2518                        sta_id);
2519         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2520          * the lowest or the highest rate.. Could consider using RSSI from
2521          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2522          * after assoc.. */
2523
2524         lq_sta->is_dup = 0;
2525         lq_sta->max_rate_idx = -1;
2526         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2527         lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
2528         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2529         lq_sta->band = priv->band;
2530         /*
2531          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2532          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2533          */
2534         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2535         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2536         lq_sta->active_siso_rate &= ~((u16)0x2);
2537         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2538
2539         /* Same here */
2540         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2541         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2542         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2543         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2544
2545         lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2546         lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2547         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2548         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2549
2550         IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2551                      lq_sta->active_siso_rate,
2552                      lq_sta->active_mimo2_rate,
2553                      lq_sta->active_mimo3_rate);
2554
2555         /* These values will be overridden later */
2556         lq_sta->lq.general_params.single_stream_ant_msk =
2557                 first_antenna(priv->hw_params.valid_tx_ant);
2558         lq_sta->lq.general_params.dual_stream_ant_msk =
2559                 priv->hw_params.valid_tx_ant &
2560                 ~first_antenna(priv->hw_params.valid_tx_ant);
2561         if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2562                 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2563         } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2564                 lq_sta->lq.general_params.dual_stream_ant_msk =
2565                         priv->hw_params.valid_tx_ant;
2566         }
2567
2568         /* as default allow aggregation for all tids */
2569         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2570         lq_sta->drv = priv;
2571
2572         /* Set last_txrate_idx to lowest rate */
2573         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2574         if (sband->band == IEEE80211_BAND_5GHZ)
2575                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2576         lq_sta->is_agg = 0;
2577
2578         rs_initialize_lq(priv, conf, sta, lq_sta);
2579 }
2580
2581 static void rs_fill_link_cmd(struct iwl_priv *priv,
2582                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2583 {
2584         struct iwl_scale_tbl_info tbl_type;
2585         int index = 0;
2586         int rate_idx;
2587         int repeat_rate = 0;
2588         u8 ant_toggle_cnt = 0;
2589         u8 use_ht_possible = 1;
2590         u8 valid_tx_ant = 0;
2591         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2592
2593         /* Override starting rate (index 0) if needed for debug purposes */
2594         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2595
2596         /* Interpret new_rate (rate_n_flags) */
2597         memset(&tbl_type, 0, sizeof(tbl_type));
2598         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2599                                   &tbl_type, &rate_idx);
2600
2601         /* How many times should we repeat the initial rate? */
2602         if (is_legacy(tbl_type.lq_type)) {
2603                 ant_toggle_cnt = 1;
2604                 repeat_rate = IWL_NUMBER_TRY;
2605         } else {
2606                 repeat_rate = IWL_HT_NUMBER_TRY;
2607         }
2608
2609         lq_cmd->general_params.mimo_delimiter =
2610                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2611
2612         /* Fill 1st table entry (index 0) */
2613         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2614
2615         if (num_of_ant(tbl_type.ant_type) == 1) {
2616                 lq_cmd->general_params.single_stream_ant_msk =
2617                                                 tbl_type.ant_type;
2618         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2619                 lq_cmd->general_params.dual_stream_ant_msk =
2620                                                 tbl_type.ant_type;
2621         } /* otherwise we don't modify the existing value */
2622
2623         index++;
2624         repeat_rate--;
2625
2626         if (priv)
2627                 valid_tx_ant = priv->hw_params.valid_tx_ant;
2628
2629         /* Fill rest of rate table */
2630         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2631                 /* Repeat initial/next rate.
2632                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2633                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2634                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2635                         if (is_legacy(tbl_type.lq_type)) {
2636                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2637                                         ant_toggle_cnt++;
2638                                 else if (priv &&
2639                                          rs_toggle_antenna(valid_tx_ant,
2640                                                         &new_rate, &tbl_type))
2641                                         ant_toggle_cnt = 1;
2642 }
2643
2644                         /* Override next rate if needed for debug purposes */
2645                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2646
2647                         /* Fill next table entry */
2648                         lq_cmd->rs_table[index].rate_n_flags =
2649                                         cpu_to_le32(new_rate);
2650                         repeat_rate--;
2651                         index++;
2652                 }
2653
2654                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2655                                                 &rate_idx);
2656
2657                 /* Indicate to uCode which entries might be MIMO.
2658                  * If initial rate was MIMO, this will finally end up
2659                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2660                 if (is_mimo(tbl_type.lq_type))
2661                         lq_cmd->general_params.mimo_delimiter = index;
2662
2663                 /* Get next rate */
2664                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2665                                              use_ht_possible);
2666
2667                 /* How many times should we repeat the next rate? */
2668                 if (is_legacy(tbl_type.lq_type)) {
2669                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2670                                 ant_toggle_cnt++;
2671                         else if (priv &&
2672                                  rs_toggle_antenna(valid_tx_ant,
2673                                                    &new_rate, &tbl_type))
2674                                 ant_toggle_cnt = 1;
2675
2676                         repeat_rate = IWL_NUMBER_TRY;
2677                 } else {
2678                         repeat_rate = IWL_HT_NUMBER_TRY;
2679                 }
2680
2681                 /* Don't allow HT rates after next pass.
2682                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2683                 use_ht_possible = 0;
2684
2685                 /* Override next rate if needed for debug purposes */
2686                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2687
2688                 /* Fill next table entry */
2689                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2690
2691                 index++;
2692                 repeat_rate--;
2693         }
2694
2695         lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2696         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2697         lq_cmd->agg_params.agg_time_limit =
2698                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2699 }
2700
2701 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2702 {
2703         return hw->priv;
2704 }
2705 /* rate scale requires free function to be implemented */
2706 static void rs_free(void *priv_rate)
2707 {
2708         return;
2709 }
2710
2711 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2712                         void *priv_sta)
2713 {
2714         struct iwl_priv *priv __maybe_unused = priv_r;
2715
2716         IWL_DEBUG_RATE(priv, "enter\n");
2717         IWL_DEBUG_RATE(priv, "leave\n");
2718 }
2719
2720
2721 #ifdef CONFIG_MAC80211_DEBUGFS
2722 static int open_file_generic(struct inode *inode, struct file *file)
2723 {
2724         file->private_data = inode->i_private;
2725         return 0;
2726 }
2727 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2728                              u32 *rate_n_flags, int index)
2729 {
2730         struct iwl_priv *priv;
2731         u8 valid_tx_ant;
2732         u8 ant_sel_tx;
2733
2734         priv = lq_sta->drv;
2735         valid_tx_ant = priv->hw_params.valid_tx_ant;
2736         if (lq_sta->dbg_fixed_rate) {
2737                 ant_sel_tx =
2738                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2739                   >> RATE_MCS_ANT_POS);
2740                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2741                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2742                         IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
2743                 } else {
2744                         lq_sta->dbg_fixed_rate = 0;
2745                         IWL_ERR(priv,
2746                             "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2747                             ant_sel_tx, valid_tx_ant);
2748                         IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2749                 }
2750         } else {
2751                 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2752         }
2753 }
2754
2755 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2756                         const char __user *user_buf, size_t count, loff_t *ppos)
2757 {
2758         struct iwl_lq_sta *lq_sta = file->private_data;
2759         struct iwl_priv *priv;
2760         char buf[64];
2761         int buf_size;
2762         u32 parsed_rate;
2763
2764         priv = lq_sta->drv;
2765         memset(buf, 0, sizeof(buf));
2766         buf_size = min(count, sizeof(buf) -  1);
2767         if (copy_from_user(buf, user_buf, buf_size))
2768                 return -EFAULT;
2769
2770         if (sscanf(buf, "%x", &parsed_rate) == 1)
2771                 lq_sta->dbg_fixed_rate = parsed_rate;
2772         else
2773                 lq_sta->dbg_fixed_rate = 0;
2774
2775         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2776         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2777         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2778         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2779
2780         IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
2781                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2782
2783         if (lq_sta->dbg_fixed_rate) {
2784                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2785                 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
2786         }
2787
2788         return count;
2789 }
2790
2791 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2792                         char __user *user_buf, size_t count, loff_t *ppos)
2793 {
2794         char *buff;
2795         int desc = 0;
2796         int i = 0;
2797         int index = 0;
2798         ssize_t ret;
2799
2800         struct iwl_lq_sta *lq_sta = file->private_data;
2801         struct iwl_priv *priv;
2802         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2803
2804         priv = lq_sta->drv;
2805         buff = kmalloc(1024, GFP_KERNEL);
2806         if (!buff)
2807                 return -ENOMEM;
2808
2809         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2810         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2811                         lq_sta->total_failed, lq_sta->total_success,
2812                         lq_sta->active_legacy_rate);
2813         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2814                         lq_sta->dbg_fixed_rate);
2815         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2816             (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2817             (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2818             (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2819         desc += sprintf(buff+desc, "lq type %s\n",
2820            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2821         if (is_Ht(tbl->lq_type)) {
2822                 desc += sprintf(buff+desc, " %s",
2823                    (is_siso(tbl->lq_type)) ? "SISO" :
2824                    ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2825                    desc += sprintf(buff+desc, " %s",
2826                    (tbl->is_ht40) ? "40MHz" : "20MHz");
2827                    desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
2828                    (lq_sta->is_green) ? "GF enabled" : "",
2829                    (lq_sta->is_agg) ? "AGG on" : "");
2830         }
2831         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2832                 lq_sta->last_rate_n_flags);
2833         desc += sprintf(buff+desc, "general:"
2834                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2835                 lq_sta->lq.general_params.flags,
2836                 lq_sta->lq.general_params.mimo_delimiter,
2837                 lq_sta->lq.general_params.single_stream_ant_msk,
2838                 lq_sta->lq.general_params.dual_stream_ant_msk);
2839
2840         desc += sprintf(buff+desc, "agg:"
2841                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2842                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2843                         lq_sta->lq.agg_params.agg_dis_start_th,
2844                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2845
2846         desc += sprintf(buff+desc,
2847                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2848                         lq_sta->lq.general_params.start_rate_index[0],
2849                         lq_sta->lq.general_params.start_rate_index[1],
2850                         lq_sta->lq.general_params.start_rate_index[2],
2851                         lq_sta->lq.general_params.start_rate_index[3]);
2852
2853         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2854                 index = iwl_hwrate_to_plcp_idx(
2855                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2856                 if (is_legacy(tbl->lq_type)) {
2857                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2858                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2859                                 iwl_rate_mcs[index].mbps);
2860                 } else {
2861                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
2862                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2863                                 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
2864                 }
2865         }
2866
2867         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2868         kfree(buff);
2869         return ret;
2870 }
2871
2872 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2873         .write = rs_sta_dbgfs_scale_table_write,
2874         .read = rs_sta_dbgfs_scale_table_read,
2875         .open = open_file_generic,
2876 };
2877 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2878                         char __user *user_buf, size_t count, loff_t *ppos)
2879 {
2880         char *buff;
2881         int desc = 0;
2882         int i, j;
2883         ssize_t ret;
2884
2885         struct iwl_lq_sta *lq_sta = file->private_data;
2886
2887         buff = kmalloc(1024, GFP_KERNEL);
2888         if (!buff)
2889                 return -ENOMEM;
2890
2891         for (i = 0; i < LQ_SIZE; i++) {
2892                 desc += sprintf(buff+desc,
2893                                 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2894                                 "rate=0x%X\n",
2895                                 lq_sta->active_tbl == i ? "*" : "x",
2896                                 lq_sta->lq_info[i].lq_type,
2897                                 lq_sta->lq_info[i].is_SGI,
2898                                 lq_sta->lq_info[i].is_ht40,
2899                                 lq_sta->lq_info[i].is_dup,
2900                                 lq_sta->is_green,
2901                                 lq_sta->lq_info[i].current_rate);
2902                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2903                         desc += sprintf(buff+desc,
2904                                 "counter=%d success=%d %%=%d\n",
2905                                 lq_sta->lq_info[i].win[j].counter,
2906                                 lq_sta->lq_info[i].win[j].success_counter,
2907                                 lq_sta->lq_info[i].win[j].success_ratio);
2908                 }
2909         }
2910         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2911         kfree(buff);
2912         return ret;
2913 }
2914
2915 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2916         .read = rs_sta_dbgfs_stats_table_read,
2917         .open = open_file_generic,
2918 };
2919
2920 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2921                         char __user *user_buf, size_t count, loff_t *ppos)
2922 {
2923         char buff[120];
2924         int desc = 0;
2925         ssize_t ret;
2926
2927         struct iwl_lq_sta *lq_sta = file->private_data;
2928         struct iwl_priv *priv;
2929         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2930
2931         priv = lq_sta->drv;
2932
2933         if (is_Ht(tbl->lq_type))
2934                 desc += sprintf(buff+desc,
2935                                 "Bit Rate= %d Mb/s\n",
2936                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
2937         else
2938                 desc += sprintf(buff+desc,
2939                                 "Bit Rate= %d Mb/s\n",
2940                                 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
2941
2942         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2943         return ret;
2944 }
2945
2946 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2947         .read = rs_sta_dbgfs_rate_scale_data_read,
2948         .open = open_file_generic,
2949 };
2950
2951 static void rs_add_debugfs(void *priv, void *priv_sta,
2952                                         struct dentry *dir)
2953 {
2954         struct iwl_lq_sta *lq_sta = priv_sta;
2955         lq_sta->rs_sta_dbgfs_scale_table_file =
2956                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2957                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2958         lq_sta->rs_sta_dbgfs_stats_table_file =
2959                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2960                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2961         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
2962                 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
2963                         lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
2964         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2965                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2966                 &lq_sta->tx_agg_tid_en);
2967
2968 }
2969
2970 static void rs_remove_debugfs(void *priv, void *priv_sta)
2971 {
2972         struct iwl_lq_sta *lq_sta = priv_sta;
2973         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2974         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2975         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
2976         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2977 }
2978 #endif
2979
2980 /*
2981  * Initialization of rate scaling information is done by driver after
2982  * the station is added. Since mac80211 calls this function before a
2983  * station is added we ignore it.
2984  */
2985 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
2986                          struct ieee80211_sta *sta, void *priv_sta)
2987 {
2988 }
2989 static struct rate_control_ops rs_ops = {
2990         .module = NULL,
2991         .name = RS_NAME,
2992         .tx_status = rs_tx_status,
2993         .get_rate = rs_get_rate,
2994         .rate_init = rs_rate_init_stub,
2995         .alloc = rs_alloc,
2996         .free = rs_free,
2997         .alloc_sta = rs_alloc_sta,
2998         .free_sta = rs_free_sta,
2999 #ifdef CONFIG_MAC80211_DEBUGFS
3000         .add_sta_debugfs = rs_add_debugfs,
3001         .remove_sta_debugfs = rs_remove_debugfs,
3002 #endif
3003 };
3004
3005 int iwlagn_rate_control_register(void)
3006 {
3007         return ieee80211_rate_control_register(&rs_ops);
3008 }
3009
3010 void iwlagn_rate_control_unregister(void)
3011 {
3012         ieee80211_rate_control_unregister(&rs_ops);
3013 }
3014