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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2012 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/slab.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37
  38 #include "dev.h"
  39 #include "agn.h"
  40
  41 #define RS_NAME "iwl-agn-rs"
  42
  43 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  44 #define IWL_NUMBER_TRY      1
  45 #define IWL_HT_NUMBER_TRY   3
  46
  47 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  48 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  49 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  50
  51 /* max allowed rate miss before sync LQ cmd */
  52 #define IWL_MISSED_RATE_MAX             15
  53 /* max time to accum history 2 seconds */
  54 #define IWL_RATE_SCALE_FLUSH_INTVL   (3*HZ)
  55
  56 static u8 rs_ht_to_legacy[] = {
  57         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  58         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  59         IWL_RATE_6M_INDEX,
  60         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  61         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  62         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  63         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  64 };
  65
  66 static const u8 ant_toggle_lookup[] = {
  67         /*ANT_NONE -> */ ANT_NONE,
  68         /*ANT_A    -> */ ANT_B,
  69         /*ANT_B    -> */ ANT_C,
  70         /*ANT_AB   -> */ ANT_BC,
  71         /*ANT_C    -> */ ANT_A,
  72         /*ANT_AC   -> */ ANT_AB,
  73         /*ANT_BC   -> */ ANT_AC,
  74         /*ANT_ABC  -> */ ANT_ABC,
  75 };
  76
  77 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
  78         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
  79                                     IWL_RATE_SISO_##s##M_PLCP, \
  80                                     IWL_RATE_MIMO2_##s##M_PLCP,\
  81                                     IWL_RATE_MIMO3_##s##M_PLCP,\
  82                                     IWL_RATE_##r##M_IEEE,      \
  83                                     IWL_RATE_##ip##M_INDEX,    \
  84                                     IWL_RATE_##in##M_INDEX,    \
  85                                     IWL_RATE_##rp##M_INDEX,    \
  86                                     IWL_RATE_##rn##M_INDEX,    \
  87                                     IWL_RATE_##pp##M_INDEX,    \
  88                                     IWL_RATE_##np##M_INDEX }
  89
  90 /*
  91  * Parameter order:
  92  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
  93  *
  94  * If there isn't a valid next or previous rate then INV is used which
  95  * maps to IWL_RATE_INVALID
  96  *
  97  */
  98 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
  99         IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),    /*  1mbps */
 100         IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
 101         IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
 102         IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
 103         IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
 104         IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
 105         IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
 106         IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
 107         IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
 108         IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
 109         IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
 110         IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
 111         IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
 112         /* FIXME:RS:          ^^    should be INV (legacy) */
 113 };
 114
 115 static inline u8 rs_extract_rate(u32 rate_n_flags)
 116 {
 117         return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
 118 }
 119
 120 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 121 {
 122         int idx = 0;
 123
 124         /* HT rate format */
 125         if (rate_n_flags & RATE_MCS_HT_MSK) {
 126                 idx = rs_extract_rate(rate_n_flags);
 127
 128                 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
 129                         idx = idx - IWL_RATE_MIMO3_6M_PLCP;
 130                 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
 131                         idx = idx - IWL_RATE_MIMO2_6M_PLCP;
 132
 133                 idx += IWL_FIRST_OFDM_RATE;
 134                 /* skip 9M not supported in ht*/
 135                 if (idx >= IWL_RATE_9M_INDEX)
 136                         idx += 1;
 137                 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
 138                         return idx;
 139
 140         /* legacy rate format, search for match in table */
 141         } else {
 142                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 143                         if (iwl_rates[idx].plcp ==
 144                                         rs_extract_rate(rate_n_flags))
 145                                 return idx;
 146         }
 147
 148         return -1;
 149 }
 150
 151 static void rs_rate_scale_perform(struct iwl_priv *priv,
 152                                    struct sk_buff *skb,
 153                                    struct ieee80211_sta *sta,
 154                                    struct iwl_lq_sta *lq_sta);
 155 static void rs_fill_link_cmd(struct iwl_priv *priv,
 156                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 157 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 158
 159
 160 #ifdef CONFIG_MAC80211_DEBUGFS
 161 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 162                              u32 *rate_n_flags, int index);
 163 #else
 164 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 165                              u32 *rate_n_flags, int index)
 166 {}
 167 #endif
 168
 169 /**
 170  * The following tables contain the expected throughput metrics for all rates
 171  *
 172  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 173  *
 174  * where invalid entries are zeros.
 175  *
 176  * CCK rates are only valid in legacy table and will only be used in G
 177  * (2.4 GHz) band.
 178  */
 179
 180 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
 181         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 182 };
 183
 184 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
 185         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202}, /* Norm */
 186         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210}, /* SGI */
 187         {0, 0, 0, 0, 47, 0,  91, 133, 171, 242, 305, 334, 362}, /* AGG */
 188         {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
 189 };
 190
 191 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
 192         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 193         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 194         {0, 0, 0, 0,  94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
 195         {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
 196 };
 197
 198 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 199         {0, 0, 0, 0,  74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
 200         {0, 0, 0, 0,  81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
 201         {0, 0, 0, 0,  89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
 202         {0, 0, 0, 0,  97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
 203 };
 204
 205 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 206         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
 207         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
 208         {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
 209         {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
 210 };
 211
 212 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
 213         {0, 0, 0, 0,  99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
 214         {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
 215         {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
 216         {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
 217 };
 218
 219 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
 220         {0, 0, 0, 0, 152, 0, 211, 239, 255, 279,  290,  294,  297}, /* Norm */
 221         {0, 0, 0, 0, 160, 0, 219, 245, 261, 284,  294,  297,  300}, /* SGI */
 222         {0, 0, 0, 0, 254, 0, 443, 584, 695, 868,  984, 1030, 1070}, /* AGG */
 223         {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
 224 };
 225
 226 /* mbps, mcs */
 227 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 228         {  "1", "BPSK DSSS"},
 229         {  "2", "QPSK DSSS"},
 230         {"5.5", "BPSK CCK"},
 231         { "11", "QPSK CCK"},
 232         {  "6", "BPSK 1/2"},
 233         {  "9", "BPSK 1/2"},
 234         { "12", "QPSK 1/2"},
 235         { "18", "QPSK 3/4"},
 236         { "24", "16QAM 1/2"},
 237         { "36", "16QAM 3/4"},
 238         { "48", "64QAM 2/3"},
 239         { "54", "64QAM 3/4"},
 240         { "60", "64QAM 5/6"},
 241 };
 242
 243 #define MCS_INDEX_PER_STREAM    (8)
 244
 245 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 246 {
 247         window->data = 0;
 248         window->success_counter = 0;
 249         window->success_ratio = IWL_INVALID_VALUE;
 250         window->counter = 0;
 251         window->average_tpt = IWL_INVALID_VALUE;
 252         window->stamp = 0;
 253 }
 254
 255 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 256 {
 257         return (ant_type & valid_antenna) == ant_type;
 258 }
 259
 260 /*
 261  *      removes the old data from the statistics. All data that is older than
 262  *      TID_MAX_TIME_DIFF, will be deleted.
 263  */
 264 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 265 {
 266         /* The oldest age we want to keep */
 267         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 268
 269         while (tl->queue_count &&
 270                (tl->time_stamp < oldest_time)) {
 271                 tl->total -= tl->packet_count[tl->head];
 272                 tl->packet_count[tl->head] = 0;
 273                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 274                 tl->queue_count--;
 275                 tl->head++;
 276                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 277                         tl->head = 0;
 278         }
 279 }
 280
 281 /*
 282  *      increment traffic load value for tid and also remove
 283  *      any old values if passed the certain time period
 284  */
 285 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 286                            struct ieee80211_hdr *hdr)
 287 {
 288         u32 curr_time = jiffies_to_msecs(jiffies);
 289         u32 time_diff;
 290         s32 index;
 291         struct iwl_traffic_load *tl = NULL;
 292         u8 tid;
 293
 294         if (ieee80211_is_data_qos(hdr->frame_control)) {
 295                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 296                 tid = qc[0] & 0xf;
 297         } else
 298                 return IWL_MAX_TID_COUNT;
 299
 300         if (unlikely(tid >= IWL_MAX_TID_COUNT))
 301                 return IWL_MAX_TID_COUNT;
 302
 303         tl = &lq_data->load[tid];
 304
 305         curr_time -= curr_time % TID_ROUND_VALUE;
 306
 307         /* Happens only for the first packet. Initialize the data */
 308         if (!(tl->queue_count)) {
 309                 tl->total = 1;
 310                 tl->time_stamp = curr_time;
 311                 tl->queue_count = 1;
 312                 tl->head = 0;
 313                 tl->packet_count[0] = 1;
 314                 return IWL_MAX_TID_COUNT;
 315         }
 316
 317         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 318         index = time_diff / TID_QUEUE_CELL_SPACING;
 319
 320         /* The history is too long: remove data that is older than */
 321         /* TID_MAX_TIME_DIFF */
 322         if (index >= TID_QUEUE_MAX_SIZE)
 323                 rs_tl_rm_old_stats(tl, curr_time);
 324
 325         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 326         tl->packet_count[index] = tl->packet_count[index] + 1;
 327         tl->total = tl->total + 1;
 328
 329         if ((index + 1) > tl->queue_count)
 330                 tl->queue_count = index + 1;
 331
 332         return tid;
 333 }
 334
 335 #ifdef CONFIG_MAC80211_DEBUGFS
 336 /**
 337  * Program the device to use fixed rate for frame transmit
 338  * This is for debugging/testing only
 339  * once the device start use fixed rate, we need to reload the module
 340  * to being back the normal operation.
 341  */
 342 static void rs_program_fix_rate(struct iwl_priv *priv,
 343                                 struct iwl_lq_sta *lq_sta)
 344 {
 345         struct iwl_station_priv *sta_priv =
 346                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
 347         struct iwl_rxon_context *ctx = sta_priv->ctx;
 348
 349         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
 350         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 351         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 352         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 353
 354 #ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE
 355         /* testmode has higher priority to overwirte the fixed rate */
 356         if (priv->tm_fixed_rate)
 357                 lq_sta->dbg_fixed_rate = priv->tm_fixed_rate;
 358 #endif
 359
 360         IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
 361                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
 362
 363         if (lq_sta->dbg_fixed_rate) {
 364                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
 365                 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
 366                                 false);
 367         }
 368 }
 369 #endif
 370
 371 /*
 372         get the traffic load value for tid
 373 */
 374 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 375 {
 376         u32 curr_time = jiffies_to_msecs(jiffies);
 377         u32 time_diff;
 378         s32 index;
 379         struct iwl_traffic_load *tl = NULL;
 380
 381         if (tid >= IWL_MAX_TID_COUNT)
 382                 return 0;
 383
 384         tl = &(lq_data->load[tid]);
 385
 386         curr_time -= curr_time % TID_ROUND_VALUE;
 387
 388         if (!(tl->queue_count))
 389                 return 0;
 390
 391         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 392         index = time_diff / TID_QUEUE_CELL_SPACING;
 393
 394         /* The history is too long: remove data that is older than */
 395         /* TID_MAX_TIME_DIFF */
 396         if (index >= TID_QUEUE_MAX_SIZE)
 397                 rs_tl_rm_old_stats(tl, curr_time);
 398
 399         return tl->total;
 400 }
 401
 402 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 403                                       struct iwl_lq_sta *lq_data, u8 tid,
 404                                       struct ieee80211_sta *sta)
 405 {
 406         int ret = -EAGAIN;
 407         u32 load;
 408
 409         /*
 410          * Don't create TX aggregation sessions when in high
 411          * BT traffic, as they would just be disrupted by BT.
 412          */
 413         if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
 414                 IWL_ERR(priv, "BT traffic (%d), no aggregation allowed\n",
 415                         priv->bt_traffic_load);
 416                 return ret;
 417         }
 418
 419         load = rs_tl_get_load(lq_data, tid);
 420
 421         if ((iwlwifi_mod_params.auto_agg) || (load > IWL_AGG_LOAD_THRESHOLD)) {
 422                 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
 423                                 sta->addr, tid);
 424                 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 425                 if (ret == -EAGAIN) {
 426                         /*
 427                          * driver and mac80211 is out of sync
 428                          * this might be cause by reloading firmware
 429                          * stop the tx ba session here
 430                          */
 431                         IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
 432                                 tid);
 433                         ieee80211_stop_tx_ba_session(sta, tid);
 434                 }
 435         } else {
 436                 IWL_DEBUG_HT(priv, "Aggregation not enabled for tid %d "
 437                         "because load = %u\n", tid, load);
 438         }
 439         return ret;
 440 }
 441
 442 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 443                               struct iwl_lq_sta *lq_data,
 444                               struct ieee80211_sta *sta)
 445 {
 446         if (tid < IWL_MAX_TID_COUNT)
 447                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 448         else
 449                 IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n",
 450                         tid, IWL_MAX_TID_COUNT);
 451 }
 452
 453 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 454 {
 455         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 456                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 457                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 458 }
 459
 460 /*
 461  * Static function to get the expected throughput from an iwl_scale_tbl_info
 462  * that wraps a NULL pointer check
 463  */
 464 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 465 {
 466         if (tbl->expected_tpt)
 467                 return tbl->expected_tpt[rs_index];
 468         return 0;
 469 }
 470
 471 /**
 472  * rs_collect_tx_data - Update the success/failure sliding window
 473  *
 474  * We keep a sliding window of the last 62 packets transmitted
 475  * at this rate.  window->data contains the bitmask of successful
 476  * packets.
 477  */
 478 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 479                               int scale_index, int attempts, int successes)
 480 {
 481         struct iwl_rate_scale_data *window = NULL;
 482         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 483         s32 fail_count, tpt;
 484
 485         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 486                 return -EINVAL;
 487
 488         /* Select window for current tx bit rate */
 489         window = &(tbl->win[scale_index]);
 490
 491         /* Get expected throughput */
 492         tpt = get_expected_tpt(tbl, scale_index);
 493
 494         /*
 495          * Keep track of only the latest 62 tx frame attempts in this rate's
 496          * history window; anything older isn't really relevant any more.
 497          * If we have filled up the sliding window, drop the oldest attempt;
 498          * if the oldest attempt (highest bit in bitmap) shows "success",
 499          * subtract "1" from the success counter (this is the main reason
 500          * we keep these bitmaps!).
 501          */
 502         while (attempts > 0) {
 503                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 504
 505                         /* remove earliest */
 506                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 507
 508                         if (window->data & mask) {
 509                                 window->data &= ~mask;
 510                                 window->success_counter--;
 511                         }
 512                 }
 513
 514                 /* Increment frames-attempted counter */
 515                 window->counter++;
 516
 517                 /* Shift bitmap by one frame to throw away oldest history */
 518                 window->data <<= 1;
 519
 520                 /* Mark the most recent #successes attempts as successful */
 521                 if (successes > 0) {
 522                         window->success_counter++;
 523                         window->data |= 0x1;
 524                         successes--;
 525                 }
 526
 527                 attempts--;
 528         }
 529
 530         /* Calculate current success ratio, avoid divide-by-0! */
 531         if (window->counter > 0)
 532                 window->success_ratio = 128 * (100 * window->success_counter)
 533                                         / window->counter;
 534         else
 535                 window->success_ratio = IWL_INVALID_VALUE;
 536
 537         fail_count = window->counter - window->success_counter;
 538
 539         /* Calculate average throughput, if we have enough history. */
 540         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 541             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 542                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 543         else
 544                 window->average_tpt = IWL_INVALID_VALUE;
 545
 546         /* Tag this window as having been updated */
 547         window->stamp = jiffies;
 548
 549         return 0;
 550 }
 551
 552 /*
 553  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 554  */
 555 /* FIXME:RS:remove this function and put the flags statically in the table */
 556 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
 557                                  struct iwl_scale_tbl_info *tbl,
 558                                  int index, u8 use_green)
 559 {
 560         u32 rate_n_flags = 0;
 561
 562         if (is_legacy(tbl->lq_type)) {
 563                 rate_n_flags = iwl_rates[index].plcp;
 564                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 565                         rate_n_flags |= RATE_MCS_CCK_MSK;
 566
 567         } else if (is_Ht(tbl->lq_type)) {
 568                 if (index > IWL_LAST_OFDM_RATE) {
 569                         IWL_ERR(priv, "Invalid HT rate index %d\n", index);
 570                         index = IWL_LAST_OFDM_RATE;
 571                 }
 572                 rate_n_flags = RATE_MCS_HT_MSK;
 573
 574                 if (is_siso(tbl->lq_type))
 575                         rate_n_flags |= iwl_rates[index].plcp_siso;
 576                 else if (is_mimo2(tbl->lq_type))
 577                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 578                 else
 579                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 580         } else {
 581                 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 582         }
 583
 584         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 585                                                      RATE_MCS_ANT_ABC_MSK);
 586
 587         if (is_Ht(tbl->lq_type)) {
 588                 if (tbl->is_ht40) {
 589                         if (tbl->is_dup)
 590                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 591                         else
 592                                 rate_n_flags |= RATE_MCS_HT40_MSK;
 593                 }
 594                 if (tbl->is_SGI)
 595                         rate_n_flags |= RATE_MCS_SGI_MSK;
 596
 597                 if (use_green) {
 598                         rate_n_flags |= RATE_MCS_GF_MSK;
 599                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 600                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 601                                 IWL_ERR(priv, "GF was set with SGI:SISO\n");
 602                         }
 603                 }
 604         }
 605         return rate_n_flags;
 606 }
 607
 608 /*
 609  * Interpret uCode API's rate_n_flags format,
 610  * fill "search" or "active" tx mode table.
 611  */
 612 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 613                                     enum ieee80211_band band,
 614                                     struct iwl_scale_tbl_info *tbl,
 615                                     int *rate_idx)
 616 {
 617         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 618         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 619         u8 mcs;
 620
 621         memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
 622         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 623
 624         if (*rate_idx  == IWL_RATE_INVALID) {
 625                 *rate_idx = -1;
 626                 return -EINVAL;
 627         }
 628         tbl->is_SGI = 0;        /* default legacy setup */
 629         tbl->is_ht40 = 0;
 630         tbl->is_dup = 0;
 631         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 632         tbl->lq_type = LQ_NONE;
 633         tbl->max_search = IWL_MAX_SEARCH;
 634
 635         /* legacy rate format */
 636         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 637                 if (num_of_ant == 1) {
 638                         if (band == IEEE80211_BAND_5GHZ)
 639                                 tbl->lq_type = LQ_A;
 640                         else
 641                                 tbl->lq_type = LQ_G;
 642                 }
 643         /* HT rate format */
 644         } else {
 645                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 646                         tbl->is_SGI = 1;
 647
 648                 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
 649                     (rate_n_flags & RATE_MCS_DUP_MSK))
 650                         tbl->is_ht40 = 1;
 651
 652                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 653                         tbl->is_dup = 1;
 654
 655                 mcs = rs_extract_rate(rate_n_flags);
 656
 657                 /* SISO */
 658                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 659                         if (num_of_ant == 1)
 660                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 661                 /* MIMO2 */
 662                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 663                         if (num_of_ant == 2)
 664                                 tbl->lq_type = LQ_MIMO2;
 665                 /* MIMO3 */
 666                 } else {
 667                         if (num_of_ant == 3) {
 668                                 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
 669                                 tbl->lq_type = LQ_MIMO3;
 670                         }
 671                 }
 672         }
 673         return 0;
 674 }
 675
 676 /* switch to another antenna/antennas and return 1 */
 677 /* if no other valid antenna found, return 0 */
 678 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 679                              struct iwl_scale_tbl_info *tbl)
 680 {
 681         u8 new_ant_type;
 682
 683         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 684                 return 0;
 685
 686         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 687                 return 0;
 688
 689         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 690
 691         while ((new_ant_type != tbl->ant_type) &&
 692                !rs_is_valid_ant(valid_ant, new_ant_type))
 693                 new_ant_type = ant_toggle_lookup[new_ant_type];
 694
 695         if (new_ant_type == tbl->ant_type)
 696                 return 0;
 697
 698         tbl->ant_type = new_ant_type;
 699         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 700         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 701         return 1;
 702 }
 703
 704 /**
 705  * Green-field mode is valid if the station supports it and
 706  * there are no non-GF stations present in the BSS.
 707  */
 708 static bool rs_use_green(struct ieee80211_sta *sta)
 709 {
 710         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 711         struct iwl_rxon_context *ctx = sta_priv->ctx;
 712
 713         return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
 714                 !(ctx->ht.non_gf_sta_present);
 715 }
 716
 717 /**
 718  * rs_get_supported_rates - get the available rates
 719  *
 720  * if management frame or broadcast frame only return
 721  * basic available rates.
 722  *
 723  */
 724 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 725                                   struct ieee80211_hdr *hdr,
 726                                   enum iwl_table_type rate_type)
 727 {
 728         if (is_legacy(rate_type)) {
 729                 return lq_sta->active_legacy_rate;
 730         } else {
 731                 if (is_siso(rate_type))
 732                         return lq_sta->active_siso_rate;
 733                 else if (is_mimo2(rate_type))
 734                         return lq_sta->active_mimo2_rate;
 735                 else
 736                         return lq_sta->active_mimo3_rate;
 737         }
 738 }
 739
 740 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 741                                 int rate_type)
 742 {
 743         u8 high = IWL_RATE_INVALID;
 744         u8 low = IWL_RATE_INVALID;
 745
 746         /* 802.11A or ht walks to the next literal adjacent rate in
 747          * the rate table */
 748         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 749                 int i;
 750                 u32 mask;
 751
 752                 /* Find the previous rate that is in the rate mask */
 753                 i = index - 1;
 754                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 755                         if (rate_mask & mask) {
 756                                 low = i;
 757                                 break;
 758                         }
 759                 }
 760
 761                 /* Find the next rate that is in the rate mask */
 762                 i = index + 1;
 763                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 764                         if (rate_mask & mask) {
 765                                 high = i;
 766                                 break;
 767                         }
 768                 }
 769
 770                 return (high << 8) | low;
 771         }
 772
 773         low = index;
 774         while (low != IWL_RATE_INVALID) {
 775                 low = iwl_rates[low].prev_rs;
 776                 if (low == IWL_RATE_INVALID)
 777                         break;
 778                 if (rate_mask & (1 << low))
 779                         break;
 780                 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
 781         }
 782
 783         high = index;
 784         while (high != IWL_RATE_INVALID) {
 785                 high = iwl_rates[high].next_rs;
 786                 if (high == IWL_RATE_INVALID)
 787                         break;
 788                 if (rate_mask & (1 << high))
 789                         break;
 790                 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
 791         }
 792
 793         return (high << 8) | low;
 794 }
 795
 796 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 797                              struct iwl_scale_tbl_info *tbl,
 798                              u8 scale_index, u8 ht_possible)
 799 {
 800         s32 low;
 801         u16 rate_mask;
 802         u16 high_low;
 803         u8 switch_to_legacy = 0;
 804         u8 is_green = lq_sta->is_green;
 805         struct iwl_priv *priv = lq_sta->drv;
 806
 807         /* check if we need to switch from HT to legacy rates.
 808          * assumption is that mandatory rates (1Mbps or 6Mbps)
 809          * are always supported (spec demand) */
 810         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 811                 switch_to_legacy = 1;
 812                 scale_index = rs_ht_to_legacy[scale_index];
 813                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 814                         tbl->lq_type = LQ_A;
 815                 else
 816                         tbl->lq_type = LQ_G;
 817
 818                 if (num_of_ant(tbl->ant_type) > 1)
 819                         tbl->ant_type =
 820                             first_antenna(priv->eeprom_data->valid_tx_ant);
 821
 822                 tbl->is_ht40 = 0;
 823                 tbl->is_SGI = 0;
 824                 tbl->max_search = IWL_MAX_SEARCH;
 825         }
 826
 827         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 828
 829         /* Mask with station rate restriction */
 830         if (is_legacy(tbl->lq_type)) {
 831                 /* supp_rates has no CCK bits in A mode */
 832                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 833                         rate_mask  = (u16)(rate_mask &
 834                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 835                 else
 836                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 837         }
 838
 839         /* If we switched from HT to legacy, check current rate */
 840         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 841                 low = scale_index;
 842                 goto out;
 843         }
 844
 845         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 846                                         tbl->lq_type);
 847         low = high_low & 0xff;
 848
 849         if (low == IWL_RATE_INVALID)
 850                 low = scale_index;
 851
 852 out:
 853         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 854 }
 855
 856 /*
 857  * Simple function to compare two rate scale table types
 858  */
 859 static bool table_type_matches(struct iwl_scale_tbl_info *a,
 860                                struct iwl_scale_tbl_info *b)
 861 {
 862         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 863                 (a->is_SGI == b->is_SGI);
 864 }
 865
 866 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 867                             struct iwl_lq_sta *lq_sta)
 868 {
 869         struct iwl_scale_tbl_info *tbl;
 870         bool full_concurrent = priv->bt_full_concurrent;
 871
 872         if (priv->bt_ant_couple_ok) {
 873                 /*
 874                  * Is there a need to switch between
 875                  * full concurrency and 3-wire?
 876                  */
 877                 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
 878                         full_concurrent = true;
 879                 else
 880                         full_concurrent = false;
 881         }
 882         if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
 883             (priv->bt_full_concurrent != full_concurrent)) {
 884                 priv->bt_full_concurrent = full_concurrent;
 885                 priv->last_bt_traffic_load = priv->bt_traffic_load;
 886
 887                 /* Update uCode's rate table. */
 888                 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 889                 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
 890                 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 891
 892                 queue_work(priv->workqueue, &priv->bt_full_concurrency);
 893         }
 894 }
 895
 896 /*
 897  * mac80211 sends us Tx status
 898  */
 899 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 900                          struct ieee80211_sta *sta, void *priv_sta,
 901                          struct sk_buff *skb)
 902 {
 903         int legacy_success;
 904         int retries;
 905         int rs_index, mac_index, i;
 906         struct iwl_lq_sta *lq_sta = priv_sta;
 907         struct iwl_link_quality_cmd *table;
 908         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 909         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r;
 910         struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
 911         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 912         enum mac80211_rate_control_flags mac_flags;
 913         u32 tx_rate;
 914         struct iwl_scale_tbl_info tbl_type;
 915         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 916         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 917         struct iwl_rxon_context *ctx = sta_priv->ctx;
 918
 919         IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
 920
 921         /* Treat uninitialized rate scaling data same as non-existing. */
 922         if (!lq_sta) {
 923                 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
 924                 return;
 925         } else if (!lq_sta->drv) {
 926                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
 927                 return;
 928         }
 929
 930         if (!ieee80211_is_data(hdr->frame_control) ||
 931             info->flags & IEEE80211_TX_CTL_NO_ACK)
 932                 return;
 933
 934         /* This packet was aggregated but doesn't carry status info */
 935         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 936             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 937                 return;
 938
 939         /*
 940          * Ignore this Tx frame response if its initial rate doesn't match
 941          * that of latest Link Quality command.  There may be stragglers
 942          * from a previous Link Quality command, but we're no longer interested
 943          * in those; they're either from the "active" mode while we're trying
 944          * to check "search" mode, or a prior "search" mode after we've moved
 945          * to a new "search" mode (which might become the new "active" mode).
 946          */
 947         table = &lq_sta->lq;
 948         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 949         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 950         if (priv->band == IEEE80211_BAND_5GHZ)
 951                 rs_index -= IWL_FIRST_OFDM_RATE;
 952         mac_flags = info->status.rates[0].flags;
 953         mac_index = info->status.rates[0].idx;
 954         /* For HT packets, map MCS to PLCP */
 955         if (mac_flags & IEEE80211_TX_RC_MCS) {
 956                 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
 957                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 958                         mac_index++;
 959                 /*
 960                  * mac80211 HT index is always zero-indexed; we need to move
 961                  * HT OFDM rates after CCK rates in 2.4 GHz band
 962                  */
 963                 if (priv->band == IEEE80211_BAND_2GHZ)
 964                         mac_index += IWL_FIRST_OFDM_RATE;
 965         }
 966         /* Here we actually compare this rate to the latest LQ command */
 967         if ((mac_index < 0) ||
 968             (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 969             (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 970             (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
 971             (tbl_type.ant_type != info->status.antenna) ||
 972             (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 973             (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 974             (rs_index != mac_index)) {
 975                 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
 976                 /*
 977                  * Since rates mis-match, the last LQ command may have failed.
 978                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 979                  * ... driver.
 980                  */
 981                 lq_sta->missed_rate_counter++;
 982                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 983                         lq_sta->missed_rate_counter = 0;
 984                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 985                 }
 986                 /* Regardless, ignore this status info for outdated rate */
 987                 return;
 988         } else
 989                 /* Rate did match, so reset the missed_rate_counter */
 990                 lq_sta->missed_rate_counter = 0;
 991
 992         /* Figure out if rate scale algorithm is in active or search table */
 993         if (table_type_matches(&tbl_type,
 994                                 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 995                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 996                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 997         } else if (table_type_matches(&tbl_type,
 998                                 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
 999                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1000                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1001         } else {
1002                 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
1003                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1004                 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
1005                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1006                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1007                 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1008                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1009                 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1010                         tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1011                 /*
1012                  * no matching table found, let's by-pass the data collection
1013                  * and continue to perform rate scale to find the rate table
1014                  */
1015                 rs_stay_in_table(lq_sta, true);
1016                 goto done;
1017         }
1018
1019         /*
1020          * Updating the frame history depends on whether packets were
1021          * aggregated.
1022          *
1023          * For aggregation, all packets were transmitted at the same rate, the
1024          * first index into rate scale table.
1025          */
1026         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1027                 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1028                 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1029                                 &rs_index);
1030                 rs_collect_tx_data(curr_tbl, rs_index,
1031                                    info->status.ampdu_len,
1032                                    info->status.ampdu_ack_len);
1033
1034                 /* Update success/fail counts if not searching for new mode */
1035                 if (lq_sta->stay_in_tbl) {
1036                         lq_sta->total_success += info->status.ampdu_ack_len;
1037                         lq_sta->total_failed += (info->status.ampdu_len -
1038                                         info->status.ampdu_ack_len);
1039                 }
1040         } else {
1041         /*
1042          * For legacy, update frame history with for each Tx retry.
1043          */
1044                 retries = info->status.rates[0].count - 1;
1045                 /* HW doesn't send more than 15 retries */
1046                 retries = min(retries, 15);
1047
1048                 /* The last transmission may have been successful */
1049                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1050                 /* Collect data for each rate used during failed TX attempts */
1051                 for (i = 0; i <= retries; ++i) {
1052                         tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1053                         rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1054                                         &tbl_type, &rs_index);
1055                         /*
1056                          * Only collect stats if retried rate is in the same RS
1057                          * table as active/search.
1058                          */
1059                         if (table_type_matches(&tbl_type, curr_tbl))
1060                                 tmp_tbl = curr_tbl;
1061                         else if (table_type_matches(&tbl_type, other_tbl))
1062                                 tmp_tbl = other_tbl;
1063                         else
1064                                 continue;
1065                         rs_collect_tx_data(tmp_tbl, rs_index, 1,
1066                                            i < retries ? 0 : legacy_success);
1067                 }
1068
1069                 /* Update success/fail counts if not searching for new mode */
1070                 if (lq_sta->stay_in_tbl) {
1071                         lq_sta->total_success += legacy_success;
1072                         lq_sta->total_failed += retries + (1 - legacy_success);
1073                 }
1074         }
1075         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1076         lq_sta->last_rate_n_flags = tx_rate;
1077 done:
1078         /* See if there's a better rate or modulation mode to try. */
1079         if (sta && sta->supp_rates[sband->band])
1080                 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1081
1082 #if defined(CONFIG_MAC80211_DEBUGFS) && defined(CONFIG_IWLWIFI_DEVICE_TESTMODE)
1083         if ((priv->tm_fixed_rate) &&
1084             (priv->tm_fixed_rate != lq_sta->dbg_fixed_rate))
1085                 rs_program_fix_rate(priv, lq_sta);
1086 #endif
1087         if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist)
1088                 rs_bt_update_lq(priv, ctx, lq_sta);
1089 }
1090
1091 /*
1092  * Begin a period of staying with a selected modulation mode.
1093  * Set "stay_in_tbl" flag to prevent any mode switches.
1094  * Set frame tx success limits according to legacy vs. high-throughput,
1095  * and reset overall (spanning all rates) tx success history statistics.
1096  * These control how long we stay using same modulation mode before
1097  * searching for a new mode.
1098  */
1099 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1100                                  struct iwl_lq_sta *lq_sta)
1101 {
1102         IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1103         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1104         if (is_legacy) {
1105                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1106                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1107                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1108         } else {
1109                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1110                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1111                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1112         }
1113         lq_sta->table_count = 0;
1114         lq_sta->total_failed = 0;
1115         lq_sta->total_success = 0;
1116         lq_sta->flush_timer = jiffies;
1117         lq_sta->action_counter = 0;
1118 }
1119
1120 /*
1121  * Find correct throughput table for given mode of modulation
1122  */
1123 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1124                                       struct iwl_scale_tbl_info *tbl)
1125 {
1126         /* Used to choose among HT tables */
1127         s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1128
1129         /* Check for invalid LQ type */
1130         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1131                 tbl->expected_tpt = expected_tpt_legacy;
1132                 return;
1133         }
1134
1135         /* Legacy rates have only one table */
1136         if (is_legacy(tbl->lq_type)) {
1137                 tbl->expected_tpt = expected_tpt_legacy;
1138                 return;
1139         }
1140
1141         /* Choose among many HT tables depending on number of streams
1142          * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1143          * status */
1144         if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1145                 ht_tbl_pointer = expected_tpt_siso20MHz;
1146         else if (is_siso(tbl->lq_type))
1147                 ht_tbl_pointer = expected_tpt_siso40MHz;
1148         else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1149                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1150         else if (is_mimo2(tbl->lq_type))
1151                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1152         else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1153                 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1154         else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1155                 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1156
1157         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
1158                 tbl->expected_tpt = ht_tbl_pointer[0];
1159         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1160                 tbl->expected_tpt = ht_tbl_pointer[1];
1161         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1162                 tbl->expected_tpt = ht_tbl_pointer[2];
1163         else                                            /* AGG+SGI */
1164                 tbl->expected_tpt = ht_tbl_pointer[3];
1165 }
1166
1167 /*
1168  * Find starting rate for new "search" high-throughput mode of modulation.
1169  * Goal is to find lowest expected rate (under perfect conditions) that is
1170  * above the current measured throughput of "active" mode, to give new mode
1171  * a fair chance to prove itself without too many challenges.
1172  *
1173  * This gets called when transitioning to more aggressive modulation
1174  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1175  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1176  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1177  * bit rate will typically need to increase, but not if performance was bad.
1178  */
1179 static s32 rs_get_best_rate(struct iwl_priv *priv,
1180                             struct iwl_lq_sta *lq_sta,
1181                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1182                             u16 rate_mask, s8 index)
1183 {
1184         /* "active" values */
1185         struct iwl_scale_tbl_info *active_tbl =
1186             &(lq_sta->lq_info[lq_sta->active_tbl]);
1187         s32 active_sr = active_tbl->win[index].success_ratio;
1188         s32 active_tpt = active_tbl->expected_tpt[index];
1189
1190         /* expected "search" throughput */
1191         s32 *tpt_tbl = tbl->expected_tpt;
1192
1193         s32 new_rate, high, low, start_hi;
1194         u16 high_low;
1195         s8 rate = index;
1196
1197         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1198
1199         for (; ;) {
1200                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1201                                                 tbl->lq_type);
1202
1203                 low = high_low & 0xff;
1204                 high = (high_low >> 8) & 0xff;
1205
1206                 /*
1207                  * Lower the "search" bit rate, to give new "search" mode
1208                  * approximately the same throughput as "active" if:
1209                  *
1210                  * 1) "Active" mode has been working modestly well (but not
1211                  *    great), and expected "search" throughput (under perfect
1212                  *    conditions) at candidate rate is above the actual
1213                  *    measured "active" throughput (but less than expected
1214                  *    "active" throughput under perfect conditions).
1215                  * OR
1216                  * 2) "Active" mode has been working perfectly or very well
1217                  *    and expected "search" throughput (under perfect
1218                  *    conditions) at candidate rate is above expected
1219                  *    "active" throughput (under perfect conditions).
1220                  */
1221                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1222                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1223                       (active_sr <= IWL_RATE_HIGH_TH) &&
1224                       (tpt_tbl[rate] <= active_tpt))) ||
1225                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1226                      (tpt_tbl[rate] > active_tpt))) {
1227
1228                         /* (2nd or later pass)
1229                          * If we've already tried to raise the rate, and are
1230                          * now trying to lower it, use the higher rate. */
1231                         if (start_hi != IWL_RATE_INVALID) {
1232                                 new_rate = start_hi;
1233                                 break;
1234                         }
1235
1236                         new_rate = rate;
1237
1238                         /* Loop again with lower rate */
1239                         if (low != IWL_RATE_INVALID)
1240                                 rate = low;
1241
1242                         /* Lower rate not available, use the original */
1243                         else
1244                                 break;
1245
1246                 /* Else try to raise the "search" rate to match "active" */
1247                 } else {
1248                         /* (2nd or later pass)
1249                          * If we've already tried to lower the rate, and are
1250                          * now trying to raise it, use the lower rate. */
1251                         if (new_rate != IWL_RATE_INVALID)
1252                                 break;
1253
1254                         /* Loop again with higher rate */
1255                         else if (high != IWL_RATE_INVALID) {
1256                                 start_hi = high;
1257                                 rate = high;
1258
1259                         /* Higher rate not available, use the original */
1260                         } else {
1261                                 new_rate = rate;
1262                                 break;
1263                         }
1264                 }
1265         }
1266
1267         return new_rate;
1268 }
1269
1270 /*
1271  * Set up search table for MIMO2
1272  */
1273 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1274                              struct iwl_lq_sta *lq_sta,
1275                              struct ieee80211_conf *conf,
1276                              struct ieee80211_sta *sta,
1277                              struct iwl_scale_tbl_info *tbl, int index)
1278 {
1279         u16 rate_mask;
1280         s32 rate;
1281         s8 is_green = lq_sta->is_green;
1282         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1283         struct iwl_rxon_context *ctx = sta_priv->ctx;
1284
1285         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1286                 return -1;
1287
1288         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1289                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1290                 return -1;
1291
1292         /* Need both Tx chains/antennas to support MIMO */
1293         if (priv->hw_params.tx_chains_num < 2)
1294                 return -1;
1295
1296         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1297
1298         tbl->lq_type = LQ_MIMO2;
1299         tbl->is_dup = lq_sta->is_dup;
1300         tbl->action = 0;
1301         tbl->max_search = IWL_MAX_SEARCH;
1302         rate_mask = lq_sta->active_mimo2_rate;
1303
1304         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1305                 tbl->is_ht40 = 1;
1306         else
1307                 tbl->is_ht40 = 0;
1308
1309         rs_set_expected_tpt_table(lq_sta, tbl);
1310
1311         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1312
1313         IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1314         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1315                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1316                                                 rate, rate_mask);
1317                 return -1;
1318         }
1319         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1320
1321         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1322                      tbl->current_rate, is_green);
1323         return 0;
1324 }
1325
1326 /*
1327  * Set up search table for MIMO3
1328  */
1329 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1330                              struct iwl_lq_sta *lq_sta,
1331                              struct ieee80211_conf *conf,
1332                              struct ieee80211_sta *sta,
1333                              struct iwl_scale_tbl_info *tbl, int index)
1334 {
1335         u16 rate_mask;
1336         s32 rate;
1337         s8 is_green = lq_sta->is_green;
1338         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1339         struct iwl_rxon_context *ctx = sta_priv->ctx;
1340
1341         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1342                 return -1;
1343
1344         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1345                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1346                 return -1;
1347
1348         /* Need both Tx chains/antennas to support MIMO */
1349         if (priv->hw_params.tx_chains_num < 3)
1350                 return -1;
1351
1352         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1353
1354         tbl->lq_type = LQ_MIMO3;
1355         tbl->is_dup = lq_sta->is_dup;
1356         tbl->action = 0;
1357         tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1358         rate_mask = lq_sta->active_mimo3_rate;
1359
1360         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1361                 tbl->is_ht40 = 1;
1362         else
1363                 tbl->is_ht40 = 0;
1364
1365         rs_set_expected_tpt_table(lq_sta, tbl);
1366
1367         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1368
1369         IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1370                 rate, rate_mask);
1371         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1372                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1373                                                 rate, rate_mask);
1374                 return -1;
1375         }
1376         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1377
1378         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1379                      tbl->current_rate, is_green);
1380         return 0;
1381 }
1382
1383 /*
1384  * Set up search table for SISO
1385  */
1386 static int rs_switch_to_siso(struct iwl_priv *priv,
1387                              struct iwl_lq_sta *lq_sta,
1388                              struct ieee80211_conf *conf,
1389                              struct ieee80211_sta *sta,
1390                              struct iwl_scale_tbl_info *tbl, int index)
1391 {
1392         u16 rate_mask;
1393         u8 is_green = lq_sta->is_green;
1394         s32 rate;
1395         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1396         struct iwl_rxon_context *ctx = sta_priv->ctx;
1397
1398         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1399                 return -1;
1400
1401         IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1402
1403         tbl->is_dup = lq_sta->is_dup;
1404         tbl->lq_type = LQ_SISO;
1405         tbl->action = 0;
1406         tbl->max_search = IWL_MAX_SEARCH;
1407         rate_mask = lq_sta->active_siso_rate;
1408
1409         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1410                 tbl->is_ht40 = 1;
1411         else
1412                 tbl->is_ht40 = 0;
1413
1414         if (is_green)
1415                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1416
1417         rs_set_expected_tpt_table(lq_sta, tbl);
1418         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1419
1420         IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1421         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1422                 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1423                              rate, rate_mask);
1424                 return -1;
1425         }
1426         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1427         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1428                      tbl->current_rate, is_green);
1429         return 0;
1430 }
1431
1432 /*
1433  * Try to switch to new modulation mode from legacy
1434  */
1435 static int rs_move_legacy_other(struct iwl_priv *priv,
1436                                 struct iwl_lq_sta *lq_sta,
1437                                 struct ieee80211_conf *conf,
1438                                 struct ieee80211_sta *sta,
1439                                 int index)
1440 {
1441         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1442         struct iwl_scale_tbl_info *search_tbl =
1443                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1444         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1445         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1446                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1447         u8 start_action;
1448         u8 valid_tx_ant = priv->eeprom_data->valid_tx_ant;
1449         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1450         int ret = 0;
1451         u8 update_search_tbl_counter = 0;
1452
1453         switch (priv->bt_traffic_load) {
1454         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1455                 /* nothing */
1456                 break;
1457         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1458                 /* avoid antenna B unless MIMO */
1459                 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1460                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1461                 break;
1462         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1463         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1464                 /* avoid antenna B and MIMO */
1465                 valid_tx_ant =
1466                         first_antenna(priv->eeprom_data->valid_tx_ant);
1467                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1468                     tbl->action != IWL_LEGACY_SWITCH_SISO)
1469                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1470                 break;
1471         default:
1472                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1473                 break;
1474         }
1475
1476         if (!iwl_ht_enabled(priv))
1477                 /* stay in Legacy */
1478                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1479         else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1480                    tbl->action > IWL_LEGACY_SWITCH_SISO)
1481                 tbl->action = IWL_LEGACY_SWITCH_SISO;
1482
1483         /* configure as 1x1 if bt full concurrency */
1484         if (priv->bt_full_concurrent) {
1485                 if (!iwl_ht_enabled(priv))
1486                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1487                 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1488                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1489                 valid_tx_ant =
1490                         first_antenna(priv->eeprom_data->valid_tx_ant);
1491         }
1492
1493         start_action = tbl->action;
1494         for (; ;) {
1495                 lq_sta->action_counter++;
1496                 switch (tbl->action) {
1497                 case IWL_LEGACY_SWITCH_ANTENNA1:
1498                 case IWL_LEGACY_SWITCH_ANTENNA2:
1499                         IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1500
1501                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1502                                                         tx_chains_num <= 1) ||
1503                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1504                                                         tx_chains_num <= 2))
1505                                 break;
1506
1507                         /* Don't change antenna if success has been great */
1508                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1509                             !priv->bt_full_concurrent &&
1510                             priv->bt_traffic_load ==
1511                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1512                                 break;
1513
1514                         /* Set up search table to try other antenna */
1515                         memcpy(search_tbl, tbl, sz);
1516
1517                         if (rs_toggle_antenna(valid_tx_ant,
1518                                 &search_tbl->current_rate, search_tbl)) {
1519                                 update_search_tbl_counter = 1;
1520                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1521                                 goto out;
1522                         }
1523                         break;
1524                 case IWL_LEGACY_SWITCH_SISO:
1525                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1526
1527                         /* Set up search table to try SISO */
1528                         memcpy(search_tbl, tbl, sz);
1529                         search_tbl->is_SGI = 0;
1530                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1531                                                  search_tbl, index);
1532                         if (!ret) {
1533                                 lq_sta->action_counter = 0;
1534                                 goto out;
1535                         }
1536
1537                         break;
1538                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1539                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1540                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1541                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1542
1543                         /* Set up search table to try MIMO */
1544                         memcpy(search_tbl, tbl, sz);
1545                         search_tbl->is_SGI = 0;
1546
1547                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1548                                 search_tbl->ant_type = ANT_AB;
1549                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1550                                 search_tbl->ant_type = ANT_AC;
1551                         else
1552                                 search_tbl->ant_type = ANT_BC;
1553
1554                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1555                                 break;
1556
1557                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1558                                                  search_tbl, index);
1559                         if (!ret) {
1560                                 lq_sta->action_counter = 0;
1561                                 goto out;
1562                         }
1563                         break;
1564
1565                 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1566                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1567
1568                         /* Set up search table to try MIMO3 */
1569                         memcpy(search_tbl, tbl, sz);
1570                         search_tbl->is_SGI = 0;
1571
1572                         search_tbl->ant_type = ANT_ABC;
1573
1574                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1575                                 break;
1576
1577                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1578                                                  search_tbl, index);
1579                         if (!ret) {
1580                                 lq_sta->action_counter = 0;
1581                                 goto out;
1582                         }
1583                         break;
1584                 }
1585                 tbl->action++;
1586                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1587                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1588
1589                 if (tbl->action == start_action)
1590                         break;
1591
1592         }
1593         search_tbl->lq_type = LQ_NONE;
1594         return 0;
1595
1596 out:
1597         lq_sta->search_better_tbl = 1;
1598         tbl->action++;
1599         if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1600                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1601         if (update_search_tbl_counter)
1602                 search_tbl->action = tbl->action;
1603         return 0;
1604
1605 }
1606
1607 /*
1608  * Try to switch to new modulation mode from SISO
1609  */
1610 static int rs_move_siso_to_other(struct iwl_priv *priv,
1611                                  struct iwl_lq_sta *lq_sta,
1612                                  struct ieee80211_conf *conf,
1613                                  struct ieee80211_sta *sta, int index)
1614 {
1615         u8 is_green = lq_sta->is_green;
1616         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1617         struct iwl_scale_tbl_info *search_tbl =
1618                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1619         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1620         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1621         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1622                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1623         u8 start_action;
1624         u8 valid_tx_ant = priv->eeprom_data->valid_tx_ant;
1625         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1626         u8 update_search_tbl_counter = 0;
1627         int ret;
1628
1629         switch (priv->bt_traffic_load) {
1630         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1631                 /* nothing */
1632                 break;
1633         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1634                 /* avoid antenna B unless MIMO */
1635                 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1636                         tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1637                 break;
1638         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1639         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1640                 /* avoid antenna B and MIMO */
1641                 valid_tx_ant =
1642                         first_antenna(priv->eeprom_data->valid_tx_ant);
1643                 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1644                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1645                 break;
1646         default:
1647                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1648                 break;
1649         }
1650
1651         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1652             tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1653                 /* stay in SISO */
1654                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1655         }
1656
1657         /* configure as 1x1 if bt full concurrency */
1658         if (priv->bt_full_concurrent) {
1659                 valid_tx_ant =
1660                         first_antenna(priv->eeprom_data->valid_tx_ant);
1661                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1662                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1663         }
1664
1665         start_action = tbl->action;
1666         for (;;) {
1667                 lq_sta->action_counter++;
1668                 switch (tbl->action) {
1669                 case IWL_SISO_SWITCH_ANTENNA1:
1670                 case IWL_SISO_SWITCH_ANTENNA2:
1671                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1672                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1673                                                 tx_chains_num <= 1) ||
1674                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1675                                                 tx_chains_num <= 2))
1676                                 break;
1677
1678                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1679                             !priv->bt_full_concurrent &&
1680                             priv->bt_traffic_load ==
1681                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1682                                 break;
1683
1684                         memcpy(search_tbl, tbl, sz);
1685                         if (rs_toggle_antenna(valid_tx_ant,
1686                                        &search_tbl->current_rate, search_tbl)) {
1687                                 update_search_tbl_counter = 1;
1688                                 goto out;
1689                         }
1690                         break;
1691                 case IWL_SISO_SWITCH_MIMO2_AB:
1692                 case IWL_SISO_SWITCH_MIMO2_AC:
1693                 case IWL_SISO_SWITCH_MIMO2_BC:
1694                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1695                         memcpy(search_tbl, tbl, sz);
1696                         search_tbl->is_SGI = 0;
1697
1698                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1699                                 search_tbl->ant_type = ANT_AB;
1700                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1701                                 search_tbl->ant_type = ANT_AC;
1702                         else
1703                                 search_tbl->ant_type = ANT_BC;
1704
1705                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1706                                 break;
1707
1708                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1709                                                  search_tbl, index);
1710                         if (!ret)
1711                                 goto out;
1712                         break;
1713                 case IWL_SISO_SWITCH_GI:
1714                         if (!tbl->is_ht40 && !(ht_cap->cap &
1715                                                 IEEE80211_HT_CAP_SGI_20))
1716                                 break;
1717                         if (tbl->is_ht40 && !(ht_cap->cap &
1718                                                 IEEE80211_HT_CAP_SGI_40))
1719                                 break;
1720
1721                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1722
1723                         memcpy(search_tbl, tbl, sz);
1724                         if (is_green) {
1725                                 if (!tbl->is_SGI)
1726                                         break;
1727                                 else
1728                                         IWL_ERR(priv,
1729                                                 "SGI was set in GF+SISO\n");
1730                         }
1731                         search_tbl->is_SGI = !tbl->is_SGI;
1732                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1733                         if (tbl->is_SGI) {
1734                                 s32 tpt = lq_sta->last_tpt / 100;
1735                                 if (tpt >= search_tbl->expected_tpt[index])
1736                                         break;
1737                         }
1738                         search_tbl->current_rate =
1739                                 rate_n_flags_from_tbl(priv, search_tbl,
1740                                                       index, is_green);
1741                         update_search_tbl_counter = 1;
1742                         goto out;
1743                 case IWL_SISO_SWITCH_MIMO3_ABC:
1744                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1745                         memcpy(search_tbl, tbl, sz);
1746                         search_tbl->is_SGI = 0;
1747                         search_tbl->ant_type = ANT_ABC;
1748
1749                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1750                                 break;
1751
1752                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1753                                                  search_tbl, index);
1754                         if (!ret)
1755                                 goto out;
1756                         break;
1757                 }
1758                 tbl->action++;
1759                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1760                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1761
1762                 if (tbl->action == start_action)
1763                         break;
1764         }
1765         search_tbl->lq_type = LQ_NONE;
1766         return 0;
1767
1768  out:
1769         lq_sta->search_better_tbl = 1;
1770         tbl->action++;
1771         if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1772                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1773         if (update_search_tbl_counter)
1774                 search_tbl->action = tbl->action;
1775
1776         return 0;
1777 }
1778
1779 /*
1780  * Try to switch to new modulation mode from MIMO2
1781  */
1782 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1783                                  struct iwl_lq_sta *lq_sta,
1784                                  struct ieee80211_conf *conf,
1785                                  struct ieee80211_sta *sta, int index)
1786 {
1787         s8 is_green = lq_sta->is_green;
1788         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1789         struct iwl_scale_tbl_info *search_tbl =
1790                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1791         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1792         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1793         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1794                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1795         u8 start_action;
1796         u8 valid_tx_ant = priv->eeprom_data->valid_tx_ant;
1797         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1798         u8 update_search_tbl_counter = 0;
1799         int ret;
1800
1801         switch (priv->bt_traffic_load) {
1802         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1803                 /* nothing */
1804                 break;
1805         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1806         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1807                 /* avoid antenna B and MIMO */
1808                 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1809                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1810                 break;
1811         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1812                 /* avoid antenna B unless MIMO */
1813                 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1814                     tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1815                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1816                 break;
1817         default:
1818                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1819                 break;
1820         }
1821
1822         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1823             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1824              tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1825                 /* switch in SISO */
1826                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1827         }
1828
1829         /* configure as 1x1 if bt full concurrency */
1830         if (priv->bt_full_concurrent &&
1831             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1832              tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1833                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1834
1835         start_action = tbl->action;
1836         for (;;) {
1837                 lq_sta->action_counter++;
1838                 switch (tbl->action) {
1839                 case IWL_MIMO2_SWITCH_ANTENNA1:
1840                 case IWL_MIMO2_SWITCH_ANTENNA2:
1841                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1842
1843                         if (tx_chains_num <= 2)
1844                                 break;
1845
1846                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1847                                 break;
1848
1849                         memcpy(search_tbl, tbl, sz);
1850                         if (rs_toggle_antenna(valid_tx_ant,
1851                                        &search_tbl->current_rate, search_tbl)) {
1852                                 update_search_tbl_counter = 1;
1853                                 goto out;
1854                         }
1855                         break;
1856                 case IWL_MIMO2_SWITCH_SISO_A:
1857                 case IWL_MIMO2_SWITCH_SISO_B:
1858                 case IWL_MIMO2_SWITCH_SISO_C:
1859                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1860
1861                         /* Set up new search table for SISO */
1862                         memcpy(search_tbl, tbl, sz);
1863
1864                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1865                                 search_tbl->ant_type = ANT_A;
1866                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1867                                 search_tbl->ant_type = ANT_B;
1868                         else
1869                                 search_tbl->ant_type = ANT_C;
1870
1871                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1872                                 break;
1873
1874                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1875                                                  search_tbl, index);
1876                         if (!ret)
1877                                 goto out;
1878
1879                         break;
1880
1881                 case IWL_MIMO2_SWITCH_GI:
1882                         if (!tbl->is_ht40 && !(ht_cap->cap &
1883                                                 IEEE80211_HT_CAP_SGI_20))
1884                                 break;
1885                         if (tbl->is_ht40 && !(ht_cap->cap &
1886                                                 IEEE80211_HT_CAP_SGI_40))
1887                                 break;
1888
1889                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1890
1891                         /* Set up new search table for MIMO2 */
1892                         memcpy(search_tbl, tbl, sz);
1893                         search_tbl->is_SGI = !tbl->is_SGI;
1894                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1895                         /*
1896                          * If active table already uses the fastest possible
1897                          * modulation (dual stream with short guard interval),
1898                          * and it's working well, there's no need to look
1899                          * for a better type of modulation!
1900                          */
1901                         if (tbl->is_SGI) {
1902                                 s32 tpt = lq_sta->last_tpt / 100;
1903                                 if (tpt >= search_tbl->expected_tpt[index])
1904                                         break;
1905                         }
1906                         search_tbl->current_rate =
1907                                 rate_n_flags_from_tbl(priv, search_tbl,
1908                                                       index, is_green);
1909                         update_search_tbl_counter = 1;
1910                         goto out;
1911
1912                 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1913                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1914                         memcpy(search_tbl, tbl, sz);
1915                         search_tbl->is_SGI = 0;
1916                         search_tbl->ant_type = ANT_ABC;
1917
1918                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1919                                 break;
1920
1921                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1922                                                  search_tbl, index);
1923                         if (!ret)
1924                                 goto out;
1925
1926                         break;
1927                 }
1928                 tbl->action++;
1929                 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1930                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1931
1932                 if (tbl->action == start_action)
1933                         break;
1934         }
1935         search_tbl->lq_type = LQ_NONE;
1936         return 0;
1937  out:
1938         lq_sta->search_better_tbl = 1;
1939         tbl->action++;
1940         if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1941                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1942         if (update_search_tbl_counter)
1943                 search_tbl->action = tbl->action;
1944
1945         return 0;
1946
1947 }
1948
1949 /*
1950  * Try to switch to new modulation mode from MIMO3
1951  */
1952 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1953                                  struct iwl_lq_sta *lq_sta,
1954                                  struct ieee80211_conf *conf,
1955                                  struct ieee80211_sta *sta, int index)
1956 {
1957         s8 is_green = lq_sta->is_green;
1958         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1959         struct iwl_scale_tbl_info *search_tbl =
1960                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1961         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1962         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1963         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1964                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1965         u8 start_action;
1966         u8 valid_tx_ant = priv->eeprom_data->valid_tx_ant;
1967         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1968         int ret;
1969         u8 update_search_tbl_counter = 0;
1970
1971         switch (priv->bt_traffic_load) {
1972         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1973                 /* nothing */
1974                 break;
1975         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1976         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1977                 /* avoid antenna B and MIMO */
1978                 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1979                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1980                 break;
1981         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1982                 /* avoid antenna B unless MIMO */
1983                 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1984                     tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1985                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1986                 break;
1987         default:
1988                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1989                 break;
1990         }
1991
1992         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1993             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1994              tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1995                 /* switch in SISO */
1996                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1997         }
1998
1999         /* configure as 1x1 if bt full concurrency */
2000         if (priv->bt_full_concurrent &&
2001             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
2002              tbl->action > IWL_MIMO3_SWITCH_SISO_C))
2003                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
2004
2005         start_action = tbl->action;
2006         for (;;) {
2007                 lq_sta->action_counter++;
2008                 switch (tbl->action) {
2009                 case IWL_MIMO3_SWITCH_ANTENNA1:
2010                 case IWL_MIMO3_SWITCH_ANTENNA2:
2011                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
2012
2013                         if (tx_chains_num <= 3)
2014                                 break;
2015
2016                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2017                                 break;
2018
2019                         memcpy(search_tbl, tbl, sz);
2020                         if (rs_toggle_antenna(valid_tx_ant,
2021                                        &search_tbl->current_rate, search_tbl))
2022                                 goto out;
2023                         break;
2024                 case IWL_MIMO3_SWITCH_SISO_A:
2025                 case IWL_MIMO3_SWITCH_SISO_B:
2026                 case IWL_MIMO3_SWITCH_SISO_C:
2027                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2028
2029                         /* Set up new search table for SISO */
2030                         memcpy(search_tbl, tbl, sz);
2031
2032                         if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2033                                 search_tbl->ant_type = ANT_A;
2034                         else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2035                                 search_tbl->ant_type = ANT_B;
2036                         else
2037                                 search_tbl->ant_type = ANT_C;
2038
2039                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2040                                 break;
2041
2042                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2043                                                  search_tbl, index);
2044                         if (!ret)
2045                                 goto out;
2046
2047                         break;
2048
2049                 case IWL_MIMO3_SWITCH_MIMO2_AB:
2050                 case IWL_MIMO3_SWITCH_MIMO2_AC:
2051                 case IWL_MIMO3_SWITCH_MIMO2_BC:
2052                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2053
2054                         memcpy(search_tbl, tbl, sz);
2055                         search_tbl->is_SGI = 0;
2056                         if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2057                                 search_tbl->ant_type = ANT_AB;
2058                         else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2059                                 search_tbl->ant_type = ANT_AC;
2060                         else
2061                                 search_tbl->ant_type = ANT_BC;
2062
2063                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2064                                 break;
2065
2066                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2067                                                  search_tbl, index);
2068                         if (!ret)
2069                                 goto out;
2070
2071                         break;
2072
2073                 case IWL_MIMO3_SWITCH_GI:
2074                         if (!tbl->is_ht40 && !(ht_cap->cap &
2075                                                 IEEE80211_HT_CAP_SGI_20))
2076                                 break;
2077                         if (tbl->is_ht40 && !(ht_cap->cap &
2078                                                 IEEE80211_HT_CAP_SGI_40))
2079                                 break;
2080
2081                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2082
2083                         /* Set up new search table for MIMO */
2084                         memcpy(search_tbl, tbl, sz);
2085                         search_tbl->is_SGI = !tbl->is_SGI;
2086                         rs_set_expected_tpt_table(lq_sta, search_tbl);
2087                         /*
2088                          * If active table already uses the fastest possible
2089                          * modulation (dual stream with short guard interval),
2090                          * and it's working well, there's no need to look
2091                          * for a better type of modulation!
2092                          */
2093                         if (tbl->is_SGI) {
2094                                 s32 tpt = lq_sta->last_tpt / 100;
2095                                 if (tpt >= search_tbl->expected_tpt[index])
2096                                         break;
2097                         }
2098                         search_tbl->current_rate =
2099                                 rate_n_flags_from_tbl(priv, search_tbl,
2100                                                       index, is_green);
2101                         update_search_tbl_counter = 1;
2102                         goto out;
2103                 }
2104                 tbl->action++;
2105                 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2106                         tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2107
2108                 if (tbl->action == start_action)
2109                         break;
2110         }
2111         search_tbl->lq_type = LQ_NONE;
2112         return 0;
2113  out:
2114         lq_sta->search_better_tbl = 1;
2115         tbl->action++;
2116         if (tbl->action > IWL_MIMO3_SWITCH_GI)
2117                 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2118         if (update_search_tbl_counter)
2119                 search_tbl->action = tbl->action;
2120
2121         return 0;
2122
2123 }
2124
2125 /*
2126  * Check whether we should continue using same modulation mode, or
2127  * begin search for a new mode, based on:
2128  * 1) # tx successes or failures while using this mode
2129  * 2) # times calling this function
2130  * 3) elapsed time in this mode (not used, for now)
2131  */
2132 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2133 {
2134         struct iwl_scale_tbl_info *tbl;
2135         int i;
2136         int active_tbl;
2137         int flush_interval_passed = 0;
2138         struct iwl_priv *priv;
2139
2140         priv = lq_sta->drv;
2141         active_tbl = lq_sta->active_tbl;
2142
2143         tbl = &(lq_sta->lq_info[active_tbl]);
2144
2145         /* If we've been disallowing search, see if we should now allow it */
2146         if (lq_sta->stay_in_tbl) {
2147
2148                 /* Elapsed time using current modulation mode */
2149                 if (lq_sta->flush_timer)
2150                         flush_interval_passed =
2151                         time_after(jiffies,
2152                                         (unsigned long)(lq_sta->flush_timer +
2153                                         IWL_RATE_SCALE_FLUSH_INTVL));
2154
2155                 /*
2156                  * Check if we should allow search for new modulation mode.
2157                  * If many frames have failed or succeeded, or we've used
2158                  * this same modulation for a long time, allow search, and
2159                  * reset history stats that keep track of whether we should
2160                  * allow a new search.  Also (below) reset all bitmaps and
2161                  * stats in active history.
2162                  */
2163                 if (force_search ||
2164                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2165                     (lq_sta->total_success > lq_sta->max_success_limit) ||
2166                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2167                      && (flush_interval_passed))) {
2168                         IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n",
2169                                      lq_sta->total_failed,
2170                                      lq_sta->total_success,
2171                                      flush_interval_passed);
2172
2173                         /* Allow search for new mode */
2174                         lq_sta->stay_in_tbl = 0;        /* only place reset */
2175                         lq_sta->total_failed = 0;
2176                         lq_sta->total_success = 0;
2177                         lq_sta->flush_timer = 0;
2178
2179                 /*
2180                  * Else if we've used this modulation mode enough repetitions
2181                  * (regardless of elapsed time or success/failure), reset
2182                  * history bitmaps and rate-specific stats for all rates in
2183                  * active table.
2184                  */
2185                 } else {
2186                         lq_sta->table_count++;
2187                         if (lq_sta->table_count >=
2188                             lq_sta->table_count_limit) {
2189                                 lq_sta->table_count = 0;
2190
2191                                 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2192                                 for (i = 0; i < IWL_RATE_COUNT; i++)
2193                                         rs_rate_scale_clear_window(
2194                                                 &(tbl->win[i]));
2195                         }
2196                 }
2197
2198                 /* If transitioning to allow "search", reset all history
2199                  * bitmaps and stats in active table (this will become the new
2200                  * "search" table). */
2201                 if (!lq_sta->stay_in_tbl) {
2202                         for (i = 0; i < IWL_RATE_COUNT; i++)
2203                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2204                 }
2205         }
2206 }
2207
2208 /*
2209  * setup rate table in uCode
2210  */
2211 static void rs_update_rate_tbl(struct iwl_priv *priv,
2212                                struct iwl_rxon_context *ctx,
2213                                struct iwl_lq_sta *lq_sta,
2214                                struct iwl_scale_tbl_info *tbl,
2215                                int index, u8 is_green)
2216 {
2217         u32 rate;
2218
2219         /* Update uCode's rate table. */
2220         rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2221         rs_fill_link_cmd(priv, lq_sta, rate);
2222         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2223 }
2224
2225 /*
2226  * Do rate scaling and search for new modulation mode.
2227  */
2228 static void rs_rate_scale_perform(struct iwl_priv *priv,
2229                                   struct sk_buff *skb,
2230                                   struct ieee80211_sta *sta,
2231                                   struct iwl_lq_sta *lq_sta)
2232 {
2233         struct ieee80211_hw *hw = priv->hw;
2234         struct ieee80211_conf *conf = &hw->conf;
2235         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2236         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2237         int low = IWL_RATE_INVALID;
2238         int high = IWL_RATE_INVALID;
2239         int index;
2240         int i;
2241         struct iwl_rate_scale_data *window = NULL;
2242         int current_tpt = IWL_INVALID_VALUE;
2243         int low_tpt = IWL_INVALID_VALUE;
2244         int high_tpt = IWL_INVALID_VALUE;
2245         u32 fail_count;
2246         s8 scale_action = 0;
2247         u16 rate_mask;
2248         u8 update_lq = 0;
2249         struct iwl_scale_tbl_info *tbl, *tbl1;
2250         u16 rate_scale_index_msk = 0;
2251         u8 is_green = 0;
2252         u8 active_tbl = 0;
2253         u8 done_search = 0;
2254         u16 high_low;
2255         s32 sr;
2256         u8 tid = IWL_MAX_TID_COUNT;
2257         struct iwl_tid_data *tid_data;
2258         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2259         struct iwl_rxon_context *ctx = sta_priv->ctx;
2260
2261         IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2262
2263         /* Send management frames and NO_ACK data using lowest rate. */
2264         /* TODO: this could probably be improved.. */
2265         if (!ieee80211_is_data(hdr->frame_control) ||
2266             info->flags & IEEE80211_TX_CTL_NO_ACK)
2267                 return;
2268
2269         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2270
2271         tid = rs_tl_add_packet(lq_sta, hdr);
2272         if ((tid != IWL_MAX_TID_COUNT) &&
2273             (lq_sta->tx_agg_tid_en & (1 << tid))) {
2274                 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid];
2275                 if (tid_data->agg.state == IWL_AGG_OFF)
2276                         lq_sta->is_agg = 0;
2277                 else
2278                         lq_sta->is_agg = 1;
2279         } else
2280                 lq_sta->is_agg = 0;
2281
2282         /*
2283          * Select rate-scale / modulation-mode table to work with in
2284          * the rest of this function:  "search" if searching for better
2285          * modulation mode, or "active" if doing rate scaling within a mode.
2286          */
2287         if (!lq_sta->search_better_tbl)
2288                 active_tbl = lq_sta->active_tbl;
2289         else
2290                 active_tbl = 1 - lq_sta->active_tbl;
2291
2292         tbl = &(lq_sta->lq_info[active_tbl]);
2293         if (is_legacy(tbl->lq_type))
2294                 lq_sta->is_green = 0;
2295         else
2296                 lq_sta->is_green = rs_use_green(sta);
2297         is_green = lq_sta->is_green;
2298
2299         /* current tx rate */
2300         index = lq_sta->last_txrate_idx;
2301
2302         IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2303                        tbl->lq_type);
2304
2305         /* rates available for this association, and for modulation mode */
2306         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2307
2308         IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2309
2310         /* mask with station rate restriction */
2311         if (is_legacy(tbl->lq_type)) {
2312                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2313                         /* supp_rates has no CCK bits in A mode */
2314                         rate_scale_index_msk = (u16) (rate_mask &
2315                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2316                 else
2317                         rate_scale_index_msk = (u16) (rate_mask &
2318                                                       lq_sta->supp_rates);
2319
2320         } else
2321                 rate_scale_index_msk = rate_mask;
2322
2323         if (!rate_scale_index_msk)
2324                 rate_scale_index_msk = rate_mask;
2325
2326         if (!((1 << index) & rate_scale_index_msk)) {
2327                 IWL_ERR(priv, "Current Rate is not valid\n");
2328                 if (lq_sta->search_better_tbl) {
2329                         /* revert to active table if search table is not valid*/
2330                         tbl->lq_type = LQ_NONE;
2331                         lq_sta->search_better_tbl = 0;
2332                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2333                         /* get "active" rate info */
2334                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2335                         rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2336                                            index, is_green);
2337                 }
2338                 return;
2339         }
2340
2341         /* Get expected throughput table and history window for current rate */
2342         if (!tbl->expected_tpt) {
2343                 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2344                 return;
2345         }
2346
2347         /* force user max rate if set by user */
2348         if ((lq_sta->max_rate_idx != -1) &&
2349             (lq_sta->max_rate_idx < index)) {
2350                 index = lq_sta->max_rate_idx;
2351                 update_lq = 1;
2352                 window = &(tbl->win[index]);
2353                 goto lq_update;
2354         }
2355
2356         window = &(tbl->win[index]);
2357
2358         /*
2359          * If there is not enough history to calculate actual average
2360          * throughput, keep analyzing results of more tx frames, without
2361          * changing rate or mode (bypass most of the rest of this function).
2362          * Set up new rate table in uCode only if old rate is not supported
2363          * in current association (use new rate found above).
2364          */
2365         fail_count = window->counter - window->success_counter;
2366         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2367                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2368                 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2369                                "for index %d\n",
2370                                window->success_counter, window->counter, index);
2371
2372                 /* Can't calculate this yet; not enough history */
2373                 window->average_tpt = IWL_INVALID_VALUE;
2374
2375                 /* Should we stay with this modulation mode,
2376                  * or search for a new one? */
2377                 rs_stay_in_table(lq_sta, false);
2378
2379                 goto out;
2380         }
2381         /* Else we have enough samples; calculate estimate of
2382          * actual average throughput */
2383         if (window->average_tpt != ((window->success_ratio *
2384                         tbl->expected_tpt[index] + 64) / 128)) {
2385                 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2386                 window->average_tpt = ((window->success_ratio *
2387                                         tbl->expected_tpt[index] + 64) / 128);
2388         }
2389
2390         /* If we are searching for better modulation mode, check success. */
2391         if (lq_sta->search_better_tbl &&
2392             (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2393                 /* If good success, continue using the "search" mode;
2394                  * no need to send new link quality command, since we're
2395                  * continuing to use the setup that we've been trying. */
2396                 if (window->average_tpt > lq_sta->last_tpt) {
2397
2398                         IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2399                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2400                                         window->success_ratio,
2401                                         window->average_tpt,
2402                                         lq_sta->last_tpt);
2403
2404                         if (!is_legacy(tbl->lq_type))
2405                                 lq_sta->enable_counter = 1;
2406
2407                         /* Swap tables; "search" becomes "active" */
2408                         lq_sta->active_tbl = active_tbl;
2409                         current_tpt = window->average_tpt;
2410
2411                 /* Else poor success; go back to mode in "active" table */
2412                 } else {
2413
2414                         IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2415                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2416                                         window->success_ratio,
2417                                         window->average_tpt,
2418                                         lq_sta->last_tpt);
2419
2420                         /* Nullify "search" table */
2421                         tbl->lq_type = LQ_NONE;
2422
2423                         /* Revert to "active" table */
2424                         active_tbl = lq_sta->active_tbl;
2425                         tbl = &(lq_sta->lq_info[active_tbl]);
2426
2427                         /* Revert to "active" rate and throughput info */
2428                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2429                         current_tpt = lq_sta->last_tpt;
2430
2431                         /* Need to set up a new rate table in uCode */
2432                         update_lq = 1;
2433                 }
2434
2435                 /* Either way, we've made a decision; modulation mode
2436                  * search is done, allow rate adjustment next time. */
2437                 lq_sta->search_better_tbl = 0;
2438                 done_search = 1;        /* Don't switch modes below! */
2439                 goto lq_update;
2440         }
2441
2442         /* (Else) not in search of better modulation mode, try for better
2443          * starting rate, while staying in this mode. */
2444         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2445                                         tbl->lq_type);
2446         low = high_low & 0xff;
2447         high = (high_low >> 8) & 0xff;
2448
2449         /* If user set max rate, dont allow higher than user constrain */
2450         if ((lq_sta->max_rate_idx != -1) &&
2451             (lq_sta->max_rate_idx < high))
2452                 high = IWL_RATE_INVALID;
2453
2454         sr = window->success_ratio;
2455
2456         /* Collect measured throughputs for current and adjacent rates */
2457         current_tpt = window->average_tpt;
2458         if (low != IWL_RATE_INVALID)
2459                 low_tpt = tbl->win[low].average_tpt;
2460         if (high != IWL_RATE_INVALID)
2461                 high_tpt = tbl->win[high].average_tpt;
2462
2463         scale_action = 0;
2464
2465         /* Too many failures, decrease rate */
2466         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2467                 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2468                 scale_action = -1;
2469
2470         /* No throughput measured yet for adjacent rates; try increase. */
2471         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2472                    (high_tpt == IWL_INVALID_VALUE)) {
2473
2474                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2475                         scale_action = 1;
2476                 else if (low != IWL_RATE_INVALID)
2477                         scale_action = 0;
2478         }
2479
2480         /* Both adjacent throughputs are measured, but neither one has better
2481          * throughput; we're using the best rate, don't change it! */
2482         else if ((low_tpt != IWL_INVALID_VALUE) &&
2483                  (high_tpt != IWL_INVALID_VALUE) &&
2484                  (low_tpt < current_tpt) &&
2485                  (high_tpt < current_tpt))
2486                 scale_action = 0;
2487
2488         /* At least one adjacent rate's throughput is measured,
2489          * and may have better performance. */
2490         else {
2491                 /* Higher adjacent rate's throughput is measured */
2492                 if (high_tpt != IWL_INVALID_VALUE) {
2493                         /* Higher rate has better throughput */
2494                         if (high_tpt > current_tpt &&
2495                                         sr >= IWL_RATE_INCREASE_TH) {
2496                                 scale_action = 1;
2497                         } else {
2498                                 scale_action = 0;
2499                         }
2500
2501                 /* Lower adjacent rate's throughput is measured */
2502                 } else if (low_tpt != IWL_INVALID_VALUE) {
2503                         /* Lower rate has better throughput */
2504                         if (low_tpt > current_tpt) {
2505                                 IWL_DEBUG_RATE(priv,
2506                                     "decrease rate because of low tpt\n");
2507                                 scale_action = -1;
2508                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2509                                 scale_action = 1;
2510                         }
2511                 }
2512         }
2513
2514         /* Sanity check; asked for decrease, but success rate or throughput
2515          * has been good at old rate.  Don't change it. */
2516         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2517                     ((sr > IWL_RATE_HIGH_TH) ||
2518                      (current_tpt > (100 * tbl->expected_tpt[low]))))
2519                 scale_action = 0;
2520         if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2521                 scale_action = -1;
2522         if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2523                 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2524                 scale_action = -1;
2525
2526         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2527              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2528                 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2529                         /*
2530                          * don't set scale_action, don't want to scale up if
2531                          * the rate scale doesn't otherwise think that is a
2532                          * good idea.
2533                          */
2534                 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2535                         scale_action = -1;
2536                 }
2537         }
2538         lq_sta->last_bt_traffic = priv->bt_traffic_load;
2539
2540         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2541              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2542                 /* search for a new modulation */
2543                 rs_stay_in_table(lq_sta, true);
2544                 goto lq_update;
2545         }
2546
2547         switch (scale_action) {
2548         case -1:
2549                 /* Decrease starting rate, update uCode's rate table */
2550                 if (low != IWL_RATE_INVALID) {
2551                         update_lq = 1;
2552                         index = low;
2553                 }
2554
2555                 break;
2556         case 1:
2557                 /* Increase starting rate, update uCode's rate table */
2558                 if (high != IWL_RATE_INVALID) {
2559                         update_lq = 1;
2560                         index = high;
2561                 }
2562
2563                 break;
2564         case 0:
2565                 /* No change */
2566         default:
2567                 break;
2568         }
2569
2570         IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2571                     "high %d type %d\n",
2572                      index, scale_action, low, high, tbl->lq_type);
2573
2574 lq_update:
2575         /* Replace uCode's rate table for the destination station. */
2576         if (update_lq)
2577                 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2578
2579         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2580                 /* Should we stay with this modulation mode,
2581                  * or search for a new one? */
2582           rs_stay_in_table(lq_sta, false);
2583         }
2584         /*
2585          * Search for new modulation mode if we're:
2586          * 1)  Not changing rates right now
2587          * 2)  Not just finishing up a search
2588          * 3)  Allowing a new search
2589          */
2590         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2591                 /* Save current throughput to compare with "search" throughput*/
2592                 lq_sta->last_tpt = current_tpt;
2593
2594                 /* Select a new "search" modulation mode to try.
2595                  * If one is found, set up the new "search" table. */
2596                 if (is_legacy(tbl->lq_type))
2597                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2598                 else if (is_siso(tbl->lq_type))
2599                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2600                 else if (is_mimo2(tbl->lq_type))
2601                         rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2602                 else
2603                         rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2604
2605                 /* If new "search" mode was selected, set up in uCode table */
2606                 if (lq_sta->search_better_tbl) {
2607                         /* Access the "search" table, clear its history. */
2608                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2609                         for (i = 0; i < IWL_RATE_COUNT; i++)
2610                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2611
2612                         /* Use new "search" start rate */
2613                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2614
2615                         IWL_DEBUG_RATE(priv, "Switch current  mcs: %X index: %d\n",
2616                                      tbl->current_rate, index);
2617                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2618                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2619                 } else
2620                         done_search = 1;
2621         }
2622
2623         if (done_search && !lq_sta->stay_in_tbl) {
2624                 /* If the "active" (non-search) mode was legacy,
2625                  * and we've tried switching antennas,
2626                  * but we haven't been able to try HT modes (not available),
2627                  * stay with best antenna legacy modulation for a while
2628                  * before next round of mode comparisons. */
2629                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2630                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2631                     lq_sta->action_counter > tbl1->max_search) {
2632                         IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2633                         rs_set_stay_in_table(priv, 1, lq_sta);
2634                 }
2635
2636                 /* If we're in an HT mode, and all 3 mode switch actions
2637                  * have been tried and compared, stay in this best modulation
2638                  * mode for a while before next round of mode comparisons. */
2639                 if (lq_sta->enable_counter &&
2640                     (lq_sta->action_counter >= tbl1->max_search) &&
2641                     iwl_ht_enabled(priv)) {
2642                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2643                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2644                             (tid != IWL_MAX_TID_COUNT)) {
2645                                 u8 sta_id = lq_sta->lq.sta_id;
2646                                 tid_data = &priv->tid_data[sta_id][tid];
2647                                 if (tid_data->agg.state == IWL_AGG_OFF) {
2648                                         IWL_DEBUG_RATE(priv,
2649                                                        "try to aggregate tid %d\n",
2650                                                        tid);
2651                                         rs_tl_turn_on_agg(priv, tid,
2652                                                           lq_sta, sta);
2653                                 }
2654                         }
2655                         rs_set_stay_in_table(priv, 0, lq_sta);
2656                 }
2657         }
2658
2659 out:
2660         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2661         lq_sta->last_txrate_idx = index;
2662 }
2663
2664 /**
2665  * rs_initialize_lq - Initialize a station's hardware rate table
2666  *
2667  * The uCode's station table contains a table of fallback rates
2668  * for automatic fallback during transmission.
2669  *
2670  * NOTE: This sets up a default set of values.  These will be replaced later
2671  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2672  *       rc80211_simple.
2673  *
2674  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2675  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2676  *       which requires station table entry to exist).
2677  */
2678 static void rs_initialize_lq(struct iwl_priv *priv,
2679                              struct ieee80211_sta *sta,
2680                              struct iwl_lq_sta *lq_sta)
2681 {
2682         struct iwl_scale_tbl_info *tbl;
2683         int rate_idx;
2684         int i;
2685         u32 rate;
2686         u8 use_green = rs_use_green(sta);
2687         u8 active_tbl = 0;
2688         u8 valid_tx_ant;
2689         struct iwl_station_priv *sta_priv;
2690         struct iwl_rxon_context *ctx;
2691
2692         if (!sta || !lq_sta)
2693                 return;
2694
2695         sta_priv = (void *)sta->drv_priv;
2696         ctx = sta_priv->ctx;
2697
2698         i = lq_sta->last_txrate_idx;
2699
2700         valid_tx_ant = priv->eeprom_data->valid_tx_ant;
2701
2702         if (!lq_sta->search_better_tbl)
2703                 active_tbl = lq_sta->active_tbl;
2704         else
2705                 active_tbl = 1 - lq_sta->active_tbl;
2706
2707         tbl = &(lq_sta->lq_info[active_tbl]);
2708
2709         if ((i < 0) || (i >= IWL_RATE_COUNT))
2710                 i = 0;
2711
2712         rate = iwl_rates[i].plcp;
2713         tbl->ant_type = first_antenna(valid_tx_ant);
2714         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2715
2716         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2717                 rate |= RATE_MCS_CCK_MSK;
2718
2719         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2720         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2721             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2722
2723         rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2724         tbl->current_rate = rate;
2725         rs_set_expected_tpt_table(lq_sta, tbl);
2726         rs_fill_link_cmd(NULL, lq_sta, rate);
2727         priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2728         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2729 }
2730
2731 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2732                         struct ieee80211_tx_rate_control *txrc)
2733 {
2734
2735         struct sk_buff *skb = txrc->skb;
2736         struct ieee80211_supported_band *sband = txrc->sband;
2737         struct iwl_op_mode *op_mode __maybe_unused =
2738                         (struct iwl_op_mode *)priv_r;
2739         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2740         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2741         struct iwl_lq_sta *lq_sta = priv_sta;
2742         int rate_idx;
2743
2744         IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2745
2746         /* Get max rate if user set max rate */
2747         if (lq_sta) {
2748                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2749                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2750                     (lq_sta->max_rate_idx != -1))
2751                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2752                 if ((lq_sta->max_rate_idx < 0) ||
2753                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2754                         lq_sta->max_rate_idx = -1;
2755         }
2756
2757         /* Treat uninitialized rate scaling data same as non-existing. */
2758         if (lq_sta && !lq_sta->drv) {
2759                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2760                 priv_sta = NULL;
2761         }
2762
2763         /* Send management frames and NO_ACK data using lowest rate. */
2764         if (rate_control_send_low(sta, priv_sta, txrc))
2765                 return;
2766
2767         rate_idx  = lq_sta->last_txrate_idx;
2768
2769         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2770                 rate_idx -= IWL_FIRST_OFDM_RATE;
2771                 /* 6M and 9M shared same MCS index */
2772                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2773                 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2774                     IWL_RATE_MIMO3_6M_PLCP)
2775                         rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2776                 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2777                          IWL_RATE_MIMO2_6M_PLCP)
2778                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2779                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2780                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2781                         info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2782                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2783                         info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2784                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2785                         info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2786                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2787                         info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2788         } else {
2789                 /* Check for invalid rates */
2790                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2791                                 ((sband->band == IEEE80211_BAND_5GHZ) &&
2792                                  (rate_idx < IWL_FIRST_OFDM_RATE)))
2793                         rate_idx = rate_lowest_index(sband, sta);
2794                 /* On valid 5 GHz rate, adjust index */
2795                 else if (sband->band == IEEE80211_BAND_5GHZ)
2796                         rate_idx -= IWL_FIRST_OFDM_RATE;
2797                 info->control.rates[0].flags = 0;
2798         }
2799         info->control.rates[0].idx = rate_idx;
2800
2801 }
2802
2803 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2804                           gfp_t gfp)
2805 {
2806         struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2807         struct iwl_op_mode *op_mode __maybe_unused =
2808                         (struct iwl_op_mode *)priv_rate;
2809         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2810
2811         IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2812
2813         return &sta_priv->lq_sta;
2814 }
2815
2816 /*
2817  * Called after adding a new station to initialize rate scaling
2818  */
2819 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2820 {
2821         int i, j;
2822         struct ieee80211_hw *hw = priv->hw;
2823         struct ieee80211_conf *conf = &priv->hw->conf;
2824         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2825         struct iwl_station_priv *sta_priv;
2826         struct iwl_lq_sta *lq_sta;
2827         struct ieee80211_supported_band *sband;
2828         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2829
2830         sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2831         lq_sta = &sta_priv->lq_sta;
2832         sband = hw->wiphy->bands[conf->channel->band];
2833
2834
2835         lq_sta->lq.sta_id = sta_id;
2836
2837         for (j = 0; j < LQ_SIZE; j++)
2838                 for (i = 0; i < IWL_RATE_COUNT; i++)
2839                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2840
2841         lq_sta->flush_timer = 0;
2842         lq_sta->supp_rates = sta->supp_rates[sband->band];
2843         for (j = 0; j < LQ_SIZE; j++)
2844                 for (i = 0; i < IWL_RATE_COUNT; i++)
2845                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2846
2847         IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2848                        sta_id);
2849         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2850          * the lowest or the highest rate.. Could consider using RSSI from
2851          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2852          * after assoc.. */
2853
2854         lq_sta->is_dup = 0;
2855         lq_sta->max_rate_idx = -1;
2856         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2857         lq_sta->is_green = rs_use_green(sta);
2858         lq_sta->band = sband->band;
2859         /*
2860          * active legacy rates as per supported rates bitmap
2861          */
2862         supp = sta->supp_rates[sband->band];
2863         lq_sta->active_legacy_rate = 0;
2864         for_each_set_bit(i, &supp, BITS_PER_LONG)
2865                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2866
2867         /*
2868          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2869          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2870          */
2871         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2872         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2873         lq_sta->active_siso_rate &= ~((u16)0x2);
2874         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2875
2876         /* Same here */
2877         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2878         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2879         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2880         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2881
2882         lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2883         lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2884         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2885         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2886
2887         IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2888                      lq_sta->active_siso_rate,
2889                      lq_sta->active_mimo2_rate,
2890                      lq_sta->active_mimo3_rate);
2891
2892         /* These values will be overridden later */
2893         lq_sta->lq.general_params.single_stream_ant_msk =
2894                 first_antenna(priv->eeprom_data->valid_tx_ant);
2895         lq_sta->lq.general_params.dual_stream_ant_msk =
2896                 priv->eeprom_data->valid_tx_ant &
2897                 ~first_antenna(priv->eeprom_data->valid_tx_ant);
2898         if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2899                 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2900         } else if (num_of_ant(priv->eeprom_data->valid_tx_ant) == 2) {
2901                 lq_sta->lq.general_params.dual_stream_ant_msk =
2902                         priv->eeprom_data->valid_tx_ant;
2903         }
2904
2905         /* as default allow aggregation for all tids */
2906         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2907         lq_sta->drv = priv;
2908
2909         /* Set last_txrate_idx to lowest rate */
2910         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2911         if (sband->band == IEEE80211_BAND_5GHZ)
2912                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2913         lq_sta->is_agg = 0;
2914 #ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE
2915         priv->tm_fixed_rate = 0;
2916 #endif
2917 #ifdef CONFIG_MAC80211_DEBUGFS
2918         lq_sta->dbg_fixed_rate = 0;
2919 #endif
2920
2921         rs_initialize_lq(priv, sta, lq_sta);
2922 }
2923
2924 static void rs_fill_link_cmd(struct iwl_priv *priv,
2925                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2926 {
2927         struct iwl_scale_tbl_info tbl_type;
2928         int index = 0;
2929         int rate_idx;
2930         int repeat_rate = 0;
2931         u8 ant_toggle_cnt = 0;
2932         u8 use_ht_possible = 1;
2933         u8 valid_tx_ant = 0;
2934         struct iwl_station_priv *sta_priv =
2935                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2936         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2937
2938         /* Override starting rate (index 0) if needed for debug purposes */
2939         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2940
2941         /* Interpret new_rate (rate_n_flags) */
2942         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2943                                   &tbl_type, &rate_idx);
2944
2945         if (priv && priv->bt_full_concurrent) {
2946                 /* 1x1 only */
2947                 tbl_type.ant_type =
2948                         first_antenna(priv->eeprom_data->valid_tx_ant);
2949         }
2950
2951         /* How many times should we repeat the initial rate? */
2952         if (is_legacy(tbl_type.lq_type)) {
2953                 ant_toggle_cnt = 1;
2954                 repeat_rate = IWL_NUMBER_TRY;
2955         } else {
2956                 repeat_rate = min(IWL_HT_NUMBER_TRY,
2957                                   LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2958         }
2959
2960         lq_cmd->general_params.mimo_delimiter =
2961                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2962
2963         /* Fill 1st table entry (index 0) */
2964         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2965
2966         if (num_of_ant(tbl_type.ant_type) == 1) {
2967                 lq_cmd->general_params.single_stream_ant_msk =
2968                                                 tbl_type.ant_type;
2969         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2970                 lq_cmd->general_params.dual_stream_ant_msk =
2971                                                 tbl_type.ant_type;
2972         } /* otherwise we don't modify the existing value */
2973
2974         index++;
2975         repeat_rate--;
2976         if (priv) {
2977                 if (priv->bt_full_concurrent)
2978                         valid_tx_ant = ANT_A;
2979                 else
2980                         valid_tx_ant = priv->eeprom_data->valid_tx_ant;
2981         }
2982
2983         /* Fill rest of rate table */
2984         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2985                 /* Repeat initial/next rate.
2986                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2987                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2988                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2989                         if (is_legacy(tbl_type.lq_type)) {
2990                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2991                                         ant_toggle_cnt++;
2992                                 else if (priv &&
2993                                          rs_toggle_antenna(valid_tx_ant,
2994                                                         &new_rate, &tbl_type))
2995                                         ant_toggle_cnt = 1;
2996                         }
2997
2998                         /* Override next rate if needed for debug purposes */
2999                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3000
3001                         /* Fill next table entry */
3002                         lq_cmd->rs_table[index].rate_n_flags =
3003                                         cpu_to_le32(new_rate);
3004                         repeat_rate--;
3005                         index++;
3006                 }
3007
3008                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
3009                                                 &rate_idx);
3010
3011                 if (priv && priv->bt_full_concurrent) {
3012                         /* 1x1 only */
3013                         tbl_type.ant_type =
3014                             first_antenna(priv->eeprom_data->valid_tx_ant);
3015                 }
3016
3017                 /* Indicate to uCode which entries might be MIMO.
3018                  * If initial rate was MIMO, this will finally end up
3019                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
3020                 if (is_mimo(tbl_type.lq_type))
3021                         lq_cmd->general_params.mimo_delimiter = index;
3022
3023                 /* Get next rate */
3024                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3025                                              use_ht_possible);
3026
3027                 /* How many times should we repeat the next rate? */
3028                 if (is_legacy(tbl_type.lq_type)) {
3029                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3030                                 ant_toggle_cnt++;
3031                         else if (priv &&
3032                                  rs_toggle_antenna(valid_tx_ant,
3033                                                    &new_rate, &tbl_type))
3034                                 ant_toggle_cnt = 1;
3035
3036                         repeat_rate = IWL_NUMBER_TRY;
3037                 } else {
3038                         repeat_rate = IWL_HT_NUMBER_TRY;
3039                 }
3040
3041                 /* Don't allow HT rates after next pass.
3042                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3043                 use_ht_possible = 0;
3044
3045                 /* Override next rate if needed for debug purposes */
3046                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3047
3048                 /* Fill next table entry */
3049                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3050
3051                 index++;
3052                 repeat_rate--;
3053         }
3054
3055         lq_cmd->agg_params.agg_frame_cnt_limit =
3056                 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3057         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3058
3059         lq_cmd->agg_params.agg_time_limit =
3060                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3061         /*
3062          * overwrite if needed, pass aggregation time limit
3063          * to uCode in uSec
3064          */
3065         if (priv && priv->cfg->bt_params &&
3066             priv->cfg->bt_params->agg_time_limit &&
3067             priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3068                 lq_cmd->agg_params.agg_time_limit =
3069                         cpu_to_le16(priv->cfg->bt_params->agg_time_limit);
3070 }
3071
3072 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3073 {
3074         return hw->priv;
3075 }
3076 /* rate scale requires free function to be implemented */
3077 static void rs_free(void *priv_rate)
3078 {
3079         return;
3080 }
3081
3082 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3083                         void *priv_sta)
3084 {
3085         struct iwl_op_mode *op_mode __maybe_unused = priv_r;
3086         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
3087
3088         IWL_DEBUG_RATE(priv, "enter\n");
3089         IWL_DEBUG_RATE(priv, "leave\n");
3090 }
3091
3092 #ifdef CONFIG_MAC80211_DEBUGFS
3093 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3094                              u32 *rate_n_flags, int index)
3095 {
3096         struct iwl_priv *priv;
3097         u8 valid_tx_ant;
3098         u8 ant_sel_tx;
3099
3100         priv = lq_sta->drv;
3101         valid_tx_ant = priv->eeprom_data->valid_tx_ant;
3102         if (lq_sta->dbg_fixed_rate) {
3103                 ant_sel_tx =
3104                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3105                   >> RATE_MCS_ANT_POS);
3106                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3107                         *rate_n_flags = lq_sta->dbg_fixed_rate;
3108                         IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3109                 } else {
3110                         lq_sta->dbg_fixed_rate = 0;
3111                         IWL_ERR(priv,
3112                             "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3113                             ant_sel_tx, valid_tx_ant);
3114                         IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3115                 }
3116         } else {
3117                 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3118         }
3119 }
3120
3121 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3122                         const char __user *user_buf, size_t count, loff_t *ppos)
3123 {
3124         struct iwl_lq_sta *lq_sta = file->private_data;
3125         struct iwl_priv *priv;
3126         char buf[64];
3127         size_t buf_size;
3128         u32 parsed_rate;
3129
3130
3131         priv = lq_sta->drv;
3132         memset(buf, 0, sizeof(buf));
3133         buf_size = min(count, sizeof(buf) -  1);
3134         if (copy_from_user(buf, user_buf, buf_size))
3135                 return -EFAULT;
3136
3137         if (sscanf(buf, "%x", &parsed_rate) == 1)
3138                 lq_sta->dbg_fixed_rate = parsed_rate;
3139         else
3140                 lq_sta->dbg_fixed_rate = 0;
3141
3142         rs_program_fix_rate(priv, lq_sta);
3143
3144         return count;
3145 }
3146
3147 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3148                         char __user *user_buf, size_t count, loff_t *ppos)
3149 {
3150         char *buff;
3151         int desc = 0;
3152         int i = 0;
3153         int index = 0;
3154         ssize_t ret;
3155
3156         struct iwl_lq_sta *lq_sta = file->private_data;
3157         struct iwl_priv *priv;
3158         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3159
3160         priv = lq_sta->drv;
3161         buff = kmalloc(1024, GFP_KERNEL);
3162         if (!buff)
3163                 return -ENOMEM;
3164
3165         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3166         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3167                         lq_sta->total_failed, lq_sta->total_success,
3168                         lq_sta->active_legacy_rate);
3169         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3170                         lq_sta->dbg_fixed_rate);
3171         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3172             (priv->eeprom_data->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3173             (priv->eeprom_data->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3174             (priv->eeprom_data->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3175         desc += sprintf(buff+desc, "lq type %s\n",
3176            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3177         if (is_Ht(tbl->lq_type)) {
3178                 desc += sprintf(buff+desc, " %s",
3179                    (is_siso(tbl->lq_type)) ? "SISO" :
3180                    ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3181                    desc += sprintf(buff+desc, " %s",
3182                    (tbl->is_ht40) ? "40MHz" : "20MHz");
3183                    desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3184                    (lq_sta->is_green) ? "GF enabled" : "",
3185                    (lq_sta->is_agg) ? "AGG on" : "");
3186         }
3187         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3188                 lq_sta->last_rate_n_flags);
3189         desc += sprintf(buff+desc, "general:"
3190                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3191                 lq_sta->lq.general_params.flags,
3192                 lq_sta->lq.general_params.mimo_delimiter,
3193                 lq_sta->lq.general_params.single_stream_ant_msk,
3194                 lq_sta->lq.general_params.dual_stream_ant_msk);
3195
3196         desc += sprintf(buff+desc, "agg:"
3197                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3198                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3199                         lq_sta->lq.agg_params.agg_dis_start_th,
3200                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
3201
3202         desc += sprintf(buff+desc,
3203                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3204                         lq_sta->lq.general_params.start_rate_index[0],
3205                         lq_sta->lq.general_params.start_rate_index[1],
3206                         lq_sta->lq.general_params.start_rate_index[2],
3207                         lq_sta->lq.general_params.start_rate_index[3]);
3208
3209         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3210                 index = iwl_hwrate_to_plcp_idx(
3211                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3212                 if (is_legacy(tbl->lq_type)) {
3213                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3214                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3215                                 iwl_rate_mcs[index].mbps);
3216                 } else {
3217                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3218                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3219                                 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3220                 }
3221         }
3222
3223         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3224         kfree(buff);
3225         return ret;
3226 }
3227
3228 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3229         .write = rs_sta_dbgfs_scale_table_write,
3230         .read = rs_sta_dbgfs_scale_table_read,
3231         .open = simple_open,
3232         .llseek = default_llseek,
3233 };
3234 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3235                         char __user *user_buf, size_t count, loff_t *ppos)
3236 {
3237         char *buff;
3238         int desc = 0;
3239         int i, j;
3240         ssize_t ret;
3241
3242         struct iwl_lq_sta *lq_sta = file->private_data;
3243
3244         buff = kmalloc(1024, GFP_KERNEL);
3245         if (!buff)
3246                 return -ENOMEM;
3247
3248         for (i = 0; i < LQ_SIZE; i++) {
3249                 desc += sprintf(buff+desc,
3250                                 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3251                                 "rate=0x%X\n",
3252                                 lq_sta->active_tbl == i ? "*" : "x",
3253                                 lq_sta->lq_info[i].lq_type,
3254                                 lq_sta->lq_info[i].is_SGI,
3255                                 lq_sta->lq_info[i].is_ht40,
3256                                 lq_sta->lq_info[i].is_dup,
3257                                 lq_sta->is_green,
3258                                 lq_sta->lq_info[i].current_rate);
3259                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3260                         desc += sprintf(buff+desc,
3261                                 "counter=%d success=%d %%=%d\n",
3262                                 lq_sta->lq_info[i].win[j].counter,
3263                                 lq_sta->lq_info[i].win[j].success_counter,
3264                                 lq_sta->lq_info[i].win[j].success_ratio);
3265                 }
3266         }
3267         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3268         kfree(buff);
3269         return ret;
3270 }
3271
3272 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3273         .read = rs_sta_dbgfs_stats_table_read,
3274         .open = simple_open,
3275         .llseek = default_llseek,
3276 };
3277
3278 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3279                         char __user *user_buf, size_t count, loff_t *ppos)
3280 {
3281         struct iwl_lq_sta *lq_sta = file->private_data;
3282         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3283         char buff[120];
3284         int desc = 0;
3285
3286         if (is_Ht(tbl->lq_type))
3287                 desc += sprintf(buff+desc,
3288                                 "Bit Rate= %d Mb/s\n",
3289                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3290         else
3291                 desc += sprintf(buff+desc,
3292                                 "Bit Rate= %d Mb/s\n",
3293                                 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3294
3295         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3296 }
3297
3298 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3299         .read = rs_sta_dbgfs_rate_scale_data_read,
3300         .open = simple_open,
3301         .llseek = default_llseek,
3302 };
3303
3304 static void rs_add_debugfs(void *priv, void *priv_sta,
3305                                         struct dentry *dir)
3306 {
3307         struct iwl_lq_sta *lq_sta = priv_sta;
3308         lq_sta->rs_sta_dbgfs_scale_table_file =
3309                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3310                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3311         lq_sta->rs_sta_dbgfs_stats_table_file =
3312                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3313                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
3314         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3315                 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3316                         lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3317         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3318                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3319                 &lq_sta->tx_agg_tid_en);
3320
3321 }
3322
3323 static void rs_remove_debugfs(void *priv, void *priv_sta)
3324 {
3325         struct iwl_lq_sta *lq_sta = priv_sta;
3326         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3327         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3328         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3329         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3330 }
3331 #endif
3332
3333 /*
3334  * Initialization of rate scaling information is done by driver after
3335  * the station is added. Since mac80211 calls this function before a
3336  * station is added we ignore it.
3337  */
3338 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3339                          struct ieee80211_sta *sta, void *priv_sta)
3340 {
3341 }
3342 static struct rate_control_ops rs_ops = {
3343         .module = NULL,
3344         .name = RS_NAME,
3345         .tx_status = rs_tx_status,
3346         .get_rate = rs_get_rate,
3347         .rate_init = rs_rate_init_stub,
3348         .alloc = rs_alloc,
3349         .free = rs_free,
3350         .alloc_sta = rs_alloc_sta,
3351         .free_sta = rs_free_sta,
3352 #ifdef CONFIG_MAC80211_DEBUGFS
3353         .add_sta_debugfs = rs_add_debugfs,
3354         .remove_sta_debugfs = rs_remove_debugfs,
3355 #endif
3356 };
3357
3358 int iwlagn_rate_control_register(void)
3359 {
3360         return ieee80211_rate_control_register(&rs_ops);
3361 }
3362
3363 void iwlagn_rate_control_unregister(void)
3364 {
3365         ieee80211_rate_control_unregister(&rs_ops);
3366 }
3367