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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/slab.h>
  30 #include <linux/wireless.h>
  31 #include <net/mac80211.h>
  32
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/delay.h>
  36
  37 #include <linux/workqueue.h>
  38
  39 #include "iwl-dev.h"
  40 #include "iwl-sta.h"
  41 #include "iwl-core.h"
  42 #include "iwl-agn.h"
  43
  44 #define RS_NAME "iwl-agn-rs"
  45
  46 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  47 #define IWL_NUMBER_TRY      1
  48 #define IWL_HT_NUMBER_TRY   3
  49
  50 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  51 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  52 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  53
  54 /* max allowed rate miss before sync LQ cmd */
  55 #define IWL_MISSED_RATE_MAX             15
  56 /* max time to accum history 2 seconds */
  57 #define IWL_RATE_SCALE_FLUSH_INTVL   (3*HZ)
  58
  59 static u8 rs_ht_to_legacy[] = {
  60         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  61         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  62         IWL_RATE_6M_INDEX,
  63         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  64         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  65         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  66         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  67 };
  68
  69 static const u8 ant_toggle_lookup[] = {
  70         /*ANT_NONE -> */ ANT_NONE,
  71         /*ANT_A    -> */ ANT_B,
  72         /*ANT_B    -> */ ANT_C,
  73         /*ANT_AB   -> */ ANT_BC,
  74         /*ANT_C    -> */ ANT_A,
  75         /*ANT_AC   -> */ ANT_AB,
  76         /*ANT_BC   -> */ ANT_AC,
  77         /*ANT_ABC  -> */ ANT_ABC,
  78 };
  79
  80 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
  81         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
  82                                     IWL_RATE_SISO_##s##M_PLCP, \
  83                                     IWL_RATE_MIMO2_##s##M_PLCP,\
  84                                     IWL_RATE_MIMO3_##s##M_PLCP,\
  85                                     IWL_RATE_##r##M_IEEE,      \
  86                                     IWL_RATE_##ip##M_INDEX,    \
  87                                     IWL_RATE_##in##M_INDEX,    \
  88                                     IWL_RATE_##rp##M_INDEX,    \
  89                                     IWL_RATE_##rn##M_INDEX,    \
  90                                     IWL_RATE_##pp##M_INDEX,    \
  91                                     IWL_RATE_##np##M_INDEX }
  92
  93 /*
  94  * Parameter order:
  95  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
  96  *
  97  * If there isn't a valid next or previous rate then INV is used which
  98  * maps to IWL_RATE_INVALID
  99  *
 100  */
 101 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
 102         IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),    /*  1mbps */
 103         IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
 104         IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
 105         IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
 106         IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
 107         IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
 108         IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
 109         IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
 110         IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
 111         IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
 112         IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
 113         IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
 114         IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
 115         /* FIXME:RS:          ^^    should be INV (legacy) */
 116 };
 117
 118 static inline u8 rs_extract_rate(u32 rate_n_flags)
 119 {
 120         return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
 121 }
 122
 123 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 124 {
 125         int idx = 0;
 126
 127         /* HT rate format */
 128         if (rate_n_flags & RATE_MCS_HT_MSK) {
 129                 idx = rs_extract_rate(rate_n_flags);
 130
 131                 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
 132                         idx = idx - IWL_RATE_MIMO3_6M_PLCP;
 133                 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
 134                         idx = idx - IWL_RATE_MIMO2_6M_PLCP;
 135
 136                 idx += IWL_FIRST_OFDM_RATE;
 137                 /* skip 9M not supported in ht*/
 138                 if (idx >= IWL_RATE_9M_INDEX)
 139                         idx += 1;
 140                 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
 141                         return idx;
 142
 143         /* legacy rate format, search for match in table */
 144         } else {
 145                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 146                         if (iwl_rates[idx].plcp ==
 147                                         rs_extract_rate(rate_n_flags))
 148                                 return idx;
 149         }
 150
 151         return -1;
 152 }
 153
 154 static void rs_rate_scale_perform(struct iwl_priv *priv,
 155                                    struct sk_buff *skb,
 156                                    struct ieee80211_sta *sta,
 157                                    struct iwl_lq_sta *lq_sta);
 158 static void rs_fill_link_cmd(struct iwl_priv *priv,
 159                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 160 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 161
 162
 163 #ifdef CONFIG_MAC80211_DEBUGFS
 164 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 165                              u32 *rate_n_flags, int index);
 166 #else
 167 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 168                              u32 *rate_n_flags, int index)
 169 {}
 170 #endif
 171
 172 /**
 173  * The following tables contain the expected throughput metrics for all rates
 174  *
 175  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 176  *
 177  * where invalid entries are zeros.
 178  *
 179  * CCK rates are only valid in legacy table and will only be used in G
 180  * (2.4 GHz) band.
 181  */
 182
 183 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
 184         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 185 };
 186
 187 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
 188         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202}, /* Norm */
 189         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210}, /* SGI */
 190         {0, 0, 0, 0, 47, 0,  91, 133, 171, 242, 305, 334, 362}, /* AGG */
 191         {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
 192 };
 193
 194 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
 195         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 196         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 197         {0, 0, 0, 0,  94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
 198         {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
 199 };
 200
 201 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 202         {0, 0, 0, 0,  74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
 203         {0, 0, 0, 0,  81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
 204         {0, 0, 0, 0,  89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
 205         {0, 0, 0, 0,  97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
 206 };
 207
 208 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 209         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
 210         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
 211         {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
 212         {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
 213 };
 214
 215 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
 216         {0, 0, 0, 0,  99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
 217         {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
 218         {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
 219         {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
 220 };
 221
 222 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
 223         {0, 0, 0, 0, 152, 0, 211, 239, 255, 279,  290,  294,  297}, /* Norm */
 224         {0, 0, 0, 0, 160, 0, 219, 245, 261, 284,  294,  297,  300}, /* SGI */
 225         {0, 0, 0, 0, 254, 0, 443, 584, 695, 868,  984, 1030, 1070}, /* AGG */
 226         {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
 227 };
 228
 229 /* mbps, mcs */
 230 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 231         {  "1", "BPSK DSSS"},
 232         {  "2", "QPSK DSSS"},
 233         {"5.5", "BPSK CCK"},
 234         { "11", "QPSK CCK"},
 235         {  "6", "BPSK 1/2"},
 236         {  "9", "BPSK 1/2"},
 237         { "12", "QPSK 1/2"},
 238         { "18", "QPSK 3/4"},
 239         { "24", "16QAM 1/2"},
 240         { "36", "16QAM 3/4"},
 241         { "48", "64QAM 2/3"},
 242         { "54", "64QAM 3/4"},
 243         { "60", "64QAM 5/6"},
 244 };
 245
 246 #define MCS_INDEX_PER_STREAM    (8)
 247
 248 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 249 {
 250         window->data = 0;
 251         window->success_counter = 0;
 252         window->success_ratio = IWL_INVALID_VALUE;
 253         window->counter = 0;
 254         window->average_tpt = IWL_INVALID_VALUE;
 255         window->stamp = 0;
 256 }
 257
 258 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 259 {
 260         return (ant_type & valid_antenna) == ant_type;
 261 }
 262
 263 /*
 264  *      removes the old data from the statistics. All data that is older than
 265  *      TID_MAX_TIME_DIFF, will be deleted.
 266  */
 267 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 268 {
 269         /* The oldest age we want to keep */
 270         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 271
 272         while (tl->queue_count &&
 273                (tl->time_stamp < oldest_time)) {
 274                 tl->total -= tl->packet_count[tl->head];
 275                 tl->packet_count[tl->head] = 0;
 276                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 277                 tl->queue_count--;
 278                 tl->head++;
 279                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 280                         tl->head = 0;
 281         }
 282 }
 283
 284 /*
 285  *      increment traffic load value for tid and also remove
 286  *      any old values if passed the certain time period
 287  */
 288 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 289                            struct ieee80211_hdr *hdr)
 290 {
 291         u32 curr_time = jiffies_to_msecs(jiffies);
 292         u32 time_diff;
 293         s32 index;
 294         struct iwl_traffic_load *tl = NULL;
 295         u8 tid;
 296
 297         if (ieee80211_is_data_qos(hdr->frame_control)) {
 298                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 299                 tid = qc[0] & 0xf;
 300         } else
 301                 return MAX_TID_COUNT;
 302
 303         if (unlikely(tid >= TID_MAX_LOAD_COUNT))
 304                 return MAX_TID_COUNT;
 305
 306         tl = &lq_data->load[tid];
 307
 308         curr_time -= curr_time % TID_ROUND_VALUE;
 309
 310         /* Happens only for the first packet. Initialize the data */
 311         if (!(tl->queue_count)) {
 312                 tl->total = 1;
 313                 tl->time_stamp = curr_time;
 314                 tl->queue_count = 1;
 315                 tl->head = 0;
 316                 tl->packet_count[0] = 1;
 317                 return MAX_TID_COUNT;
 318         }
 319
 320         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 321         index = time_diff / TID_QUEUE_CELL_SPACING;
 322
 323         /* The history is too long: remove data that is older than */
 324         /* TID_MAX_TIME_DIFF */
 325         if (index >= TID_QUEUE_MAX_SIZE)
 326                 rs_tl_rm_old_stats(tl, curr_time);
 327
 328         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 329         tl->packet_count[index] = tl->packet_count[index] + 1;
 330         tl->total = tl->total + 1;
 331
 332         if ((index + 1) > tl->queue_count)
 333                 tl->queue_count = index + 1;
 334
 335         return tid;
 336 }
 337
 338 #ifdef CONFIG_MAC80211_DEBUGFS
 339 static void rs_program_fix_rate(struct iwl_priv *priv,
 340                                 struct iwl_lq_sta *lq_sta)
 341 {
 342         struct iwl_station_priv *sta_priv =
 343                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
 344         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
 345
 346         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
 347         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 348         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 349         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 350
 351         lq_sta->dbg_fixed_rate = priv->dbg_fixed_rate;
 352
 353         IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
 354                 lq_sta->lq.sta_id, priv->dbg_fixed_rate);
 355
 356         if (priv->dbg_fixed_rate) {
 357                 rs_fill_link_cmd(NULL, lq_sta, priv->dbg_fixed_rate);
 358                 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
 359                                 false);
 360         }
 361 }
 362 #endif
 363
 364 /*
 365         get the traffic load value for tid
 366 */
 367 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 368 {
 369         u32 curr_time = jiffies_to_msecs(jiffies);
 370         u32 time_diff;
 371         s32 index;
 372         struct iwl_traffic_load *tl = NULL;
 373
 374         if (tid >= TID_MAX_LOAD_COUNT)
 375                 return 0;
 376
 377         tl = &(lq_data->load[tid]);
 378
 379         curr_time -= curr_time % TID_ROUND_VALUE;
 380
 381         if (!(tl->queue_count))
 382                 return 0;
 383
 384         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 385         index = time_diff / TID_QUEUE_CELL_SPACING;
 386
 387         /* The history is too long: remove data that is older than */
 388         /* TID_MAX_TIME_DIFF */
 389         if (index >= TID_QUEUE_MAX_SIZE)
 390                 rs_tl_rm_old_stats(tl, curr_time);
 391
 392         return tl->total;
 393 }
 394
 395 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 396                                       struct iwl_lq_sta *lq_data, u8 tid,
 397                                       struct ieee80211_sta *sta)
 398 {
 399         int ret = -EAGAIN;
 400         u32 load;
 401
 402         /*
 403          * Don't create TX aggregation sessions when in high
 404          * BT traffic, as they would just be disrupted by BT.
 405          */
 406         if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
 407                 IWL_ERR(priv, "BT traffic (%d), no aggregation allowed\n",
 408                         priv->bt_traffic_load);
 409                 return ret;
 410         }
 411
 412         load = rs_tl_get_load(lq_data, tid);
 413
 414         if (load > IWL_AGG_LOAD_THRESHOLD) {
 415                 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
 416                                 sta->addr, tid);
 417                 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 418                 if (ret == -EAGAIN) {
 419                         /*
 420                          * driver and mac80211 is out of sync
 421                          * this might be cause by reloading firmware
 422                          * stop the tx ba session here
 423                          */
 424                         IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
 425                                 tid);
 426                         ieee80211_stop_tx_ba_session(sta, tid);
 427                 }
 428         } else {
 429                 IWL_ERR(priv, "Aggregation not enabled for tid %d "
 430                         "because load = %u\n", tid, load);
 431         }
 432         return ret;
 433 }
 434
 435 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 436                               struct iwl_lq_sta *lq_data,
 437                               struct ieee80211_sta *sta)
 438 {
 439         if (tid < TID_MAX_LOAD_COUNT)
 440                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 441         else
 442                 IWL_ERR(priv, "tid exceeds max load count: %d/%d\n",
 443                         tid, TID_MAX_LOAD_COUNT);
 444 }
 445
 446 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 447 {
 448         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 449                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 450                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 451 }
 452
 453 /*
 454  * Static function to get the expected throughput from an iwl_scale_tbl_info
 455  * that wraps a NULL pointer check
 456  */
 457 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 458 {
 459         if (tbl->expected_tpt)
 460                 return tbl->expected_tpt[rs_index];
 461         return 0;
 462 }
 463
 464 /**
 465  * rs_collect_tx_data - Update the success/failure sliding window
 466  *
 467  * We keep a sliding window of the last 62 packets transmitted
 468  * at this rate.  window->data contains the bitmask of successful
 469  * packets.
 470  */
 471 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 472                               int scale_index, int attempts, int successes)
 473 {
 474         struct iwl_rate_scale_data *window = NULL;
 475         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 476         s32 fail_count, tpt;
 477
 478         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 479                 return -EINVAL;
 480
 481         /* Select window for current tx bit rate */
 482         window = &(tbl->win[scale_index]);
 483
 484         /* Get expected throughput */
 485         tpt = get_expected_tpt(tbl, scale_index);
 486
 487         /*
 488          * Keep track of only the latest 62 tx frame attempts in this rate's
 489          * history window; anything older isn't really relevant any more.
 490          * If we have filled up the sliding window, drop the oldest attempt;
 491          * if the oldest attempt (highest bit in bitmap) shows "success",
 492          * subtract "1" from the success counter (this is the main reason
 493          * we keep these bitmaps!).
 494          */
 495         while (attempts > 0) {
 496                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 497
 498                         /* remove earliest */
 499                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 500
 501                         if (window->data & mask) {
 502                                 window->data &= ~mask;
 503                                 window->success_counter--;
 504                         }
 505                 }
 506
 507                 /* Increment frames-attempted counter */
 508                 window->counter++;
 509
 510                 /* Shift bitmap by one frame to throw away oldest history */
 511                 window->data <<= 1;
 512
 513                 /* Mark the most recent #successes attempts as successful */
 514                 if (successes > 0) {
 515                         window->success_counter++;
 516                         window->data |= 0x1;
 517                         successes--;
 518                 }
 519
 520                 attempts--;
 521         }
 522
 523         /* Calculate current success ratio, avoid divide-by-0! */
 524         if (window->counter > 0)
 525                 window->success_ratio = 128 * (100 * window->success_counter)
 526                                         / window->counter;
 527         else
 528                 window->success_ratio = IWL_INVALID_VALUE;
 529
 530         fail_count = window->counter - window->success_counter;
 531
 532         /* Calculate average throughput, if we have enough history. */
 533         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 534             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 535                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 536         else
 537                 window->average_tpt = IWL_INVALID_VALUE;
 538
 539         /* Tag this window as having been updated */
 540         window->stamp = jiffies;
 541
 542         return 0;
 543 }
 544
 545 /*
 546  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 547  */
 548 /* FIXME:RS:remove this function and put the flags statically in the table */
 549 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
 550                                  struct iwl_scale_tbl_info *tbl,
 551                                  int index, u8 use_green)
 552 {
 553         u32 rate_n_flags = 0;
 554
 555         if (is_legacy(tbl->lq_type)) {
 556                 rate_n_flags = iwl_rates[index].plcp;
 557                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 558                         rate_n_flags |= RATE_MCS_CCK_MSK;
 559
 560         } else if (is_Ht(tbl->lq_type)) {
 561                 if (index > IWL_LAST_OFDM_RATE) {
 562                         IWL_ERR(priv, "Invalid HT rate index %d\n", index);
 563                         index = IWL_LAST_OFDM_RATE;
 564                 }
 565                 rate_n_flags = RATE_MCS_HT_MSK;
 566
 567                 if (is_siso(tbl->lq_type))
 568                         rate_n_flags |= iwl_rates[index].plcp_siso;
 569                 else if (is_mimo2(tbl->lq_type))
 570                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 571                 else
 572                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 573         } else {
 574                 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 575         }
 576
 577         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 578                                                      RATE_MCS_ANT_ABC_MSK);
 579
 580         if (is_Ht(tbl->lq_type)) {
 581                 if (tbl->is_ht40) {
 582                         if (tbl->is_dup)
 583                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 584                         else
 585                                 rate_n_flags |= RATE_MCS_HT40_MSK;
 586                 }
 587                 if (tbl->is_SGI)
 588                         rate_n_flags |= RATE_MCS_SGI_MSK;
 589
 590                 if (use_green) {
 591                         rate_n_flags |= RATE_MCS_GF_MSK;
 592                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 593                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 594                                 IWL_ERR(priv, "GF was set with SGI:SISO\n");
 595                         }
 596                 }
 597         }
 598         return rate_n_flags;
 599 }
 600
 601 /*
 602  * Interpret uCode API's rate_n_flags format,
 603  * fill "search" or "active" tx mode table.
 604  */
 605 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 606                                     enum ieee80211_band band,
 607                                     struct iwl_scale_tbl_info *tbl,
 608                                     int *rate_idx)
 609 {
 610         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 611         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 612         u8 mcs;
 613
 614         memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
 615         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 616
 617         if (*rate_idx  == IWL_RATE_INVALID) {
 618                 *rate_idx = -1;
 619                 return -EINVAL;
 620         }
 621         tbl->is_SGI = 0;        /* default legacy setup */
 622         tbl->is_ht40 = 0;
 623         tbl->is_dup = 0;
 624         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 625         tbl->lq_type = LQ_NONE;
 626         tbl->max_search = IWL_MAX_SEARCH;
 627
 628         /* legacy rate format */
 629         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 630                 if (num_of_ant == 1) {
 631                         if (band == IEEE80211_BAND_5GHZ)
 632                                 tbl->lq_type = LQ_A;
 633                         else
 634                                 tbl->lq_type = LQ_G;
 635                 }
 636         /* HT rate format */
 637         } else {
 638                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 639                         tbl->is_SGI = 1;
 640
 641                 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
 642                     (rate_n_flags & RATE_MCS_DUP_MSK))
 643                         tbl->is_ht40 = 1;
 644
 645                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 646                         tbl->is_dup = 1;
 647
 648                 mcs = rs_extract_rate(rate_n_flags);
 649
 650                 /* SISO */
 651                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 652                         if (num_of_ant == 1)
 653                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 654                 /* MIMO2 */
 655                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 656                         if (num_of_ant == 2)
 657                                 tbl->lq_type = LQ_MIMO2;
 658                 /* MIMO3 */
 659                 } else {
 660                         if (num_of_ant == 3) {
 661                                 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
 662                                 tbl->lq_type = LQ_MIMO3;
 663                         }
 664                 }
 665         }
 666         return 0;
 667 }
 668
 669 /* switch to another antenna/antennas and return 1 */
 670 /* if no other valid antenna found, return 0 */
 671 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 672                              struct iwl_scale_tbl_info *tbl)
 673 {
 674         u8 new_ant_type;
 675
 676         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 677                 return 0;
 678
 679         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 680                 return 0;
 681
 682         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 683
 684         while ((new_ant_type != tbl->ant_type) &&
 685                !rs_is_valid_ant(valid_ant, new_ant_type))
 686                 new_ant_type = ant_toggle_lookup[new_ant_type];
 687
 688         if (new_ant_type == tbl->ant_type)
 689                 return 0;
 690
 691         tbl->ant_type = new_ant_type;
 692         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 693         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 694         return 1;
 695 }
 696
 697 /**
 698  * Green-field mode is valid if the station supports it and
 699  * there are no non-GF stations present in the BSS.
 700  */
 701 static bool rs_use_green(struct ieee80211_sta *sta)
 702 {
 703         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 704         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
 705
 706         return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
 707                 !(ctx->ht.non_gf_sta_present);
 708 }
 709
 710 /**
 711  * rs_get_supported_rates - get the available rates
 712  *
 713  * if management frame or broadcast frame only return
 714  * basic available rates.
 715  *
 716  */
 717 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 718                                   struct ieee80211_hdr *hdr,
 719                                   enum iwl_table_type rate_type)
 720 {
 721         if (is_legacy(rate_type)) {
 722                 return lq_sta->active_legacy_rate;
 723         } else {
 724                 if (is_siso(rate_type))
 725                         return lq_sta->active_siso_rate;
 726                 else if (is_mimo2(rate_type))
 727                         return lq_sta->active_mimo2_rate;
 728                 else
 729                         return lq_sta->active_mimo3_rate;
 730         }
 731 }
 732
 733 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 734                                 int rate_type)
 735 {
 736         u8 high = IWL_RATE_INVALID;
 737         u8 low = IWL_RATE_INVALID;
 738
 739         /* 802.11A or ht walks to the next literal adjacent rate in
 740          * the rate table */
 741         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 742                 int i;
 743                 u32 mask;
 744
 745                 /* Find the previous rate that is in the rate mask */
 746                 i = index - 1;
 747                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 748                         if (rate_mask & mask) {
 749                                 low = i;
 750                                 break;
 751                         }
 752                 }
 753
 754                 /* Find the next rate that is in the rate mask */
 755                 i = index + 1;
 756                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 757                         if (rate_mask & mask) {
 758                                 high = i;
 759                                 break;
 760                         }
 761                 }
 762
 763                 return (high << 8) | low;
 764         }
 765
 766         low = index;
 767         while (low != IWL_RATE_INVALID) {
 768                 low = iwl_rates[low].prev_rs;
 769                 if (low == IWL_RATE_INVALID)
 770                         break;
 771                 if (rate_mask & (1 << low))
 772                         break;
 773                 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
 774         }
 775
 776         high = index;
 777         while (high != IWL_RATE_INVALID) {
 778                 high = iwl_rates[high].next_rs;
 779                 if (high == IWL_RATE_INVALID)
 780                         break;
 781                 if (rate_mask & (1 << high))
 782                         break;
 783                 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
 784         }
 785
 786         return (high << 8) | low;
 787 }
 788
 789 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 790                              struct iwl_scale_tbl_info *tbl,
 791                              u8 scale_index, u8 ht_possible)
 792 {
 793         s32 low;
 794         u16 rate_mask;
 795         u16 high_low;
 796         u8 switch_to_legacy = 0;
 797         u8 is_green = lq_sta->is_green;
 798         struct iwl_priv *priv = lq_sta->drv;
 799
 800         /* check if we need to switch from HT to legacy rates.
 801          * assumption is that mandatory rates (1Mbps or 6Mbps)
 802          * are always supported (spec demand) */
 803         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 804                 switch_to_legacy = 1;
 805                 scale_index = rs_ht_to_legacy[scale_index];
 806                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 807                         tbl->lq_type = LQ_A;
 808                 else
 809                         tbl->lq_type = LQ_G;
 810
 811                 if (num_of_ant(tbl->ant_type) > 1)
 812                         tbl->ant_type =
 813                                 first_antenna(priv->hw_params.valid_tx_ant);
 814
 815                 tbl->is_ht40 = 0;
 816                 tbl->is_SGI = 0;
 817                 tbl->max_search = IWL_MAX_SEARCH;
 818         }
 819
 820         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 821
 822         /* Mask with station rate restriction */
 823         if (is_legacy(tbl->lq_type)) {
 824                 /* supp_rates has no CCK bits in A mode */
 825                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 826                         rate_mask  = (u16)(rate_mask &
 827                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 828                 else
 829                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 830         }
 831
 832         /* If we switched from HT to legacy, check current rate */
 833         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 834                 low = scale_index;
 835                 goto out;
 836         }
 837
 838         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 839                                         tbl->lq_type);
 840         low = high_low & 0xff;
 841
 842         if (low == IWL_RATE_INVALID)
 843                 low = scale_index;
 844
 845 out:
 846         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 847 }
 848
 849 /*
 850  * Simple function to compare two rate scale table types
 851  */
 852 static bool table_type_matches(struct iwl_scale_tbl_info *a,
 853                                struct iwl_scale_tbl_info *b)
 854 {
 855         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 856                 (a->is_SGI == b->is_SGI);
 857 }
 858
 859 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 860                             struct iwl_lq_sta *lq_sta)
 861 {
 862         struct iwl_scale_tbl_info *tbl;
 863         bool full_concurrent = priv->bt_full_concurrent;
 864         unsigned long flags;
 865
 866         if (priv->bt_ant_couple_ok) {
 867                 /*
 868                  * Is there a need to switch between
 869                  * full concurrency and 3-wire?
 870                  */
 871                 spin_lock_irqsave(&priv->lock, flags);
 872                 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
 873                         full_concurrent = true;
 874                 else
 875                         full_concurrent = false;
 876                 spin_unlock_irqrestore(&priv->lock, flags);
 877         }
 878         if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
 879             (priv->bt_full_concurrent != full_concurrent)) {
 880                 priv->bt_full_concurrent = full_concurrent;
 881
 882                 /* Update uCode's rate table. */
 883                 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 884                 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
 885                 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 886
 887                 queue_work(priv->workqueue, &priv->bt_full_concurrency);
 888         }
 889 }
 890
 891 /*
 892  * mac80211 sends us Tx status
 893  */
 894 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 895                          struct ieee80211_sta *sta, void *priv_sta,
 896                          struct sk_buff *skb)
 897 {
 898         int legacy_success;
 899         int retries;
 900         int rs_index, mac_index, i;
 901         struct iwl_lq_sta *lq_sta = priv_sta;
 902         struct iwl_link_quality_cmd *table;
 903         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 904         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
 905         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 906         enum mac80211_rate_control_flags mac_flags;
 907         u32 tx_rate;
 908         struct iwl_scale_tbl_info tbl_type;
 909         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 910         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 911         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
 912
 913         IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
 914
 915         /* Treat uninitialized rate scaling data same as non-existing. */
 916         if (!lq_sta) {
 917                 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
 918                 return;
 919         } else if (!lq_sta->drv) {
 920                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
 921                 return;
 922         }
 923
 924         if (!ieee80211_is_data(hdr->frame_control) ||
 925             info->flags & IEEE80211_TX_CTL_NO_ACK)
 926                 return;
 927
 928         /* This packet was aggregated but doesn't carry status info */
 929         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 930             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 931                 return;
 932
 933         /*
 934          * Ignore this Tx frame response if its initial rate doesn't match
 935          * that of latest Link Quality command.  There may be stragglers
 936          * from a previous Link Quality command, but we're no longer interested
 937          * in those; they're either from the "active" mode while we're trying
 938          * to check "search" mode, or a prior "search" mode after we've moved
 939          * to a new "search" mode (which might become the new "active" mode).
 940          */
 941         table = &lq_sta->lq;
 942         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 943         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 944         if (priv->band == IEEE80211_BAND_5GHZ)
 945                 rs_index -= IWL_FIRST_OFDM_RATE;
 946         mac_flags = info->status.rates[0].flags;
 947         mac_index = info->status.rates[0].idx;
 948         /* For HT packets, map MCS to PLCP */
 949         if (mac_flags & IEEE80211_TX_RC_MCS) {
 950                 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
 951                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 952                         mac_index++;
 953                 /*
 954                  * mac80211 HT index is always zero-indexed; we need to move
 955                  * HT OFDM rates after CCK rates in 2.4 GHz band
 956                  */
 957                 if (priv->band == IEEE80211_BAND_2GHZ)
 958                         mac_index += IWL_FIRST_OFDM_RATE;
 959         }
 960         /* Here we actually compare this rate to the latest LQ command */
 961         if ((mac_index < 0) ||
 962             (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 963             (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 964             (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
 965             (tbl_type.ant_type != info->antenna_sel_tx) ||
 966             (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 967             (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 968             (rs_index != mac_index)) {
 969                 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
 970                 /*
 971                  * Since rates mis-match, the last LQ command may have failed.
 972                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 973                  * ... driver.
 974                  */
 975                 lq_sta->missed_rate_counter++;
 976                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 977                         lq_sta->missed_rate_counter = 0;
 978                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 979                 }
 980                 /* Regardless, ignore this status info for outdated rate */
 981                 return;
 982         } else
 983                 /* Rate did match, so reset the missed_rate_counter */
 984                 lq_sta->missed_rate_counter = 0;
 985
 986         /* Figure out if rate scale algorithm is in active or search table */
 987         if (table_type_matches(&tbl_type,
 988                                 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 989                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 990                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 991         } else if (table_type_matches(&tbl_type,
 992                                 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
 993                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 994                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 995         } else {
 996                 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
 997                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 998                 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
 999                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1000                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1001                 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1002                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1003                 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1004                         tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1005                 /*
1006                  * no matching table found, let's by-pass the data collection
1007                  * and continue to perform rate scale to find the rate table
1008                  */
1009                 rs_stay_in_table(lq_sta, true);
1010                 goto done;
1011         }
1012
1013         /*
1014          * Updating the frame history depends on whether packets were
1015          * aggregated.
1016          *
1017          * For aggregation, all packets were transmitted at the same rate, the
1018          * first index into rate scale table.
1019          */
1020         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1021                 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1022                 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1023                                 &rs_index);
1024                 rs_collect_tx_data(curr_tbl, rs_index,
1025                                    info->status.ampdu_len,
1026                                    info->status.ampdu_ack_len);
1027
1028                 /* Update success/fail counts if not searching for new mode */
1029                 if (lq_sta->stay_in_tbl) {
1030                         lq_sta->total_success += info->status.ampdu_ack_len;
1031                         lq_sta->total_failed += (info->status.ampdu_len -
1032                                         info->status.ampdu_ack_len);
1033                 }
1034         } else {
1035         /*
1036          * For legacy, update frame history with for each Tx retry.
1037          */
1038                 retries = info->status.rates[0].count - 1;
1039                 /* HW doesn't send more than 15 retries */
1040                 retries = min(retries, 15);
1041
1042                 /* The last transmission may have been successful */
1043                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1044                 /* Collect data for each rate used during failed TX attempts */
1045                 for (i = 0; i <= retries; ++i) {
1046                         tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1047                         rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1048                                         &tbl_type, &rs_index);
1049                         /*
1050                          * Only collect stats if retried rate is in the same RS
1051                          * table as active/search.
1052                          */
1053                         if (table_type_matches(&tbl_type, curr_tbl))
1054                                 tmp_tbl = curr_tbl;
1055                         else if (table_type_matches(&tbl_type, other_tbl))
1056                                 tmp_tbl = other_tbl;
1057                         else
1058                                 continue;
1059                         rs_collect_tx_data(tmp_tbl, rs_index, 1,
1060                                            i < retries ? 0 : legacy_success);
1061                 }
1062
1063                 /* Update success/fail counts if not searching for new mode */
1064                 if (lq_sta->stay_in_tbl) {
1065                         lq_sta->total_success += legacy_success;
1066                         lq_sta->total_failed += retries + (1 - legacy_success);
1067                 }
1068         }
1069         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1070         lq_sta->last_rate_n_flags = tx_rate;
1071 done:
1072         /* See if there's a better rate or modulation mode to try. */
1073         if (sta && sta->supp_rates[sband->band])
1074                 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1075 #ifdef CONFIG_MAC80211_DEBUGFS
1076         if (priv->dbg_fixed_rate != lq_sta->dbg_fixed_rate)
1077                 rs_program_fix_rate(priv, lq_sta);
1078 #endif
1079         if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist)
1080                 rs_bt_update_lq(priv, ctx, lq_sta);
1081 }
1082
1083 /*
1084  * Begin a period of staying with a selected modulation mode.
1085  * Set "stay_in_tbl" flag to prevent any mode switches.
1086  * Set frame tx success limits according to legacy vs. high-throughput,
1087  * and reset overall (spanning all rates) tx success history statistics.
1088  * These control how long we stay using same modulation mode before
1089  * searching for a new mode.
1090  */
1091 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1092                                  struct iwl_lq_sta *lq_sta)
1093 {
1094         IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1095         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1096         if (is_legacy) {
1097                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1098                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1099                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1100         } else {
1101                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1102                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1103                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1104         }
1105         lq_sta->table_count = 0;
1106         lq_sta->total_failed = 0;
1107         lq_sta->total_success = 0;
1108         lq_sta->flush_timer = jiffies;
1109         lq_sta->action_counter = 0;
1110 }
1111
1112 /*
1113  * Find correct throughput table for given mode of modulation
1114  */
1115 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1116                                       struct iwl_scale_tbl_info *tbl)
1117 {
1118         /* Used to choose among HT tables */
1119         s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1120
1121         /* Check for invalid LQ type */
1122         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1123                 tbl->expected_tpt = expected_tpt_legacy;
1124                 return;
1125         }
1126
1127         /* Legacy rates have only one table */
1128         if (is_legacy(tbl->lq_type)) {
1129                 tbl->expected_tpt = expected_tpt_legacy;
1130                 return;
1131         }
1132
1133         /* Choose among many HT tables depending on number of streams
1134          * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1135          * status */
1136         if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1137                 ht_tbl_pointer = expected_tpt_siso20MHz;
1138         else if (is_siso(tbl->lq_type))
1139                 ht_tbl_pointer = expected_tpt_siso40MHz;
1140         else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1141                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1142         else if (is_mimo2(tbl->lq_type))
1143                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1144         else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1145                 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1146         else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1147                 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1148
1149         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
1150                 tbl->expected_tpt = ht_tbl_pointer[0];
1151         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1152                 tbl->expected_tpt = ht_tbl_pointer[1];
1153         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1154                 tbl->expected_tpt = ht_tbl_pointer[2];
1155         else                                            /* AGG+SGI */
1156                 tbl->expected_tpt = ht_tbl_pointer[3];
1157 }
1158
1159 /*
1160  * Find starting rate for new "search" high-throughput mode of modulation.
1161  * Goal is to find lowest expected rate (under perfect conditions) that is
1162  * above the current measured throughput of "active" mode, to give new mode
1163  * a fair chance to prove itself without too many challenges.
1164  *
1165  * This gets called when transitioning to more aggressive modulation
1166  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1167  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1168  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1169  * bit rate will typically need to increase, but not if performance was bad.
1170  */
1171 static s32 rs_get_best_rate(struct iwl_priv *priv,
1172                             struct iwl_lq_sta *lq_sta,
1173                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1174                             u16 rate_mask, s8 index)
1175 {
1176         /* "active" values */
1177         struct iwl_scale_tbl_info *active_tbl =
1178             &(lq_sta->lq_info[lq_sta->active_tbl]);
1179         s32 active_sr = active_tbl->win[index].success_ratio;
1180         s32 active_tpt = active_tbl->expected_tpt[index];
1181
1182         /* expected "search" throughput */
1183         s32 *tpt_tbl = tbl->expected_tpt;
1184
1185         s32 new_rate, high, low, start_hi;
1186         u16 high_low;
1187         s8 rate = index;
1188
1189         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1190
1191         for (; ;) {
1192                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1193                                                 tbl->lq_type);
1194
1195                 low = high_low & 0xff;
1196                 high = (high_low >> 8) & 0xff;
1197
1198                 /*
1199                  * Lower the "search" bit rate, to give new "search" mode
1200                  * approximately the same throughput as "active" if:
1201                  *
1202                  * 1) "Active" mode has been working modestly well (but not
1203                  *    great), and expected "search" throughput (under perfect
1204                  *    conditions) at candidate rate is above the actual
1205                  *    measured "active" throughput (but less than expected
1206                  *    "active" throughput under perfect conditions).
1207                  * OR
1208                  * 2) "Active" mode has been working perfectly or very well
1209                  *    and expected "search" throughput (under perfect
1210                  *    conditions) at candidate rate is above expected
1211                  *    "active" throughput (under perfect conditions).
1212                  */
1213                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1214                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1215                       (active_sr <= IWL_RATE_HIGH_TH) &&
1216                       (tpt_tbl[rate] <= active_tpt))) ||
1217                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1218                      (tpt_tbl[rate] > active_tpt))) {
1219
1220                         /* (2nd or later pass)
1221                          * If we've already tried to raise the rate, and are
1222                          * now trying to lower it, use the higher rate. */
1223                         if (start_hi != IWL_RATE_INVALID) {
1224                                 new_rate = start_hi;
1225                                 break;
1226                         }
1227
1228                         new_rate = rate;
1229
1230                         /* Loop again with lower rate */
1231                         if (low != IWL_RATE_INVALID)
1232                                 rate = low;
1233
1234                         /* Lower rate not available, use the original */
1235                         else
1236                                 break;
1237
1238                 /* Else try to raise the "search" rate to match "active" */
1239                 } else {
1240                         /* (2nd or later pass)
1241                          * If we've already tried to lower the rate, and are
1242                          * now trying to raise it, use the lower rate. */
1243                         if (new_rate != IWL_RATE_INVALID)
1244                                 break;
1245
1246                         /* Loop again with higher rate */
1247                         else if (high != IWL_RATE_INVALID) {
1248                                 start_hi = high;
1249                                 rate = high;
1250
1251                         /* Higher rate not available, use the original */
1252                         } else {
1253                                 new_rate = rate;
1254                                 break;
1255                         }
1256                 }
1257         }
1258
1259         return new_rate;
1260 }
1261
1262 /*
1263  * Set up search table for MIMO2
1264  */
1265 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1266                              struct iwl_lq_sta *lq_sta,
1267                              struct ieee80211_conf *conf,
1268                              struct ieee80211_sta *sta,
1269                              struct iwl_scale_tbl_info *tbl, int index)
1270 {
1271         u16 rate_mask;
1272         s32 rate;
1273         s8 is_green = lq_sta->is_green;
1274         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1275         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1276
1277         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1278                 return -1;
1279
1280         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1281                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1282                 return -1;
1283
1284         /* Need both Tx chains/antennas to support MIMO */
1285         if (priv->hw_params.tx_chains_num < 2)
1286                 return -1;
1287
1288         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1289
1290         tbl->lq_type = LQ_MIMO2;
1291         tbl->is_dup = lq_sta->is_dup;
1292         tbl->action = 0;
1293         tbl->max_search = IWL_MAX_SEARCH;
1294         rate_mask = lq_sta->active_mimo2_rate;
1295
1296         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1297                 tbl->is_ht40 = 1;
1298         else
1299                 tbl->is_ht40 = 0;
1300
1301         rs_set_expected_tpt_table(lq_sta, tbl);
1302
1303         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1304
1305         IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1306         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1307                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1308                                                 rate, rate_mask);
1309                 return -1;
1310         }
1311         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1312
1313         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1314                      tbl->current_rate, is_green);
1315         return 0;
1316 }
1317
1318 /*
1319  * Set up search table for MIMO3
1320  */
1321 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1322                              struct iwl_lq_sta *lq_sta,
1323                              struct ieee80211_conf *conf,
1324                              struct ieee80211_sta *sta,
1325                              struct iwl_scale_tbl_info *tbl, int index)
1326 {
1327         u16 rate_mask;
1328         s32 rate;
1329         s8 is_green = lq_sta->is_green;
1330         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1331         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1332
1333         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1334                 return -1;
1335
1336         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1337                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1338                 return -1;
1339
1340         /* Need both Tx chains/antennas to support MIMO */
1341         if (priv->hw_params.tx_chains_num < 3)
1342                 return -1;
1343
1344         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1345
1346         tbl->lq_type = LQ_MIMO3;
1347         tbl->is_dup = lq_sta->is_dup;
1348         tbl->action = 0;
1349         tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1350         rate_mask = lq_sta->active_mimo3_rate;
1351
1352         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1353                 tbl->is_ht40 = 1;
1354         else
1355                 tbl->is_ht40 = 0;
1356
1357         rs_set_expected_tpt_table(lq_sta, tbl);
1358
1359         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1360
1361         IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1362                 rate, rate_mask);
1363         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1364                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1365                                                 rate, rate_mask);
1366                 return -1;
1367         }
1368         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1369
1370         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1371                      tbl->current_rate, is_green);
1372         return 0;
1373 }
1374
1375 /*
1376  * Set up search table for SISO
1377  */
1378 static int rs_switch_to_siso(struct iwl_priv *priv,
1379                              struct iwl_lq_sta *lq_sta,
1380                              struct ieee80211_conf *conf,
1381                              struct ieee80211_sta *sta,
1382                              struct iwl_scale_tbl_info *tbl, int index)
1383 {
1384         u16 rate_mask;
1385         u8 is_green = lq_sta->is_green;
1386         s32 rate;
1387         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1388         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1389
1390         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1391                 return -1;
1392
1393         IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1394
1395         tbl->is_dup = lq_sta->is_dup;
1396         tbl->lq_type = LQ_SISO;
1397         tbl->action = 0;
1398         tbl->max_search = IWL_MAX_SEARCH;
1399         rate_mask = lq_sta->active_siso_rate;
1400
1401         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1402                 tbl->is_ht40 = 1;
1403         else
1404                 tbl->is_ht40 = 0;
1405
1406         if (is_green)
1407                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1408
1409         rs_set_expected_tpt_table(lq_sta, tbl);
1410         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1411
1412         IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1413         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1414                 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1415                              rate, rate_mask);
1416                 return -1;
1417         }
1418         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1419         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1420                      tbl->current_rate, is_green);
1421         return 0;
1422 }
1423
1424 /*
1425  * Try to switch to new modulation mode from legacy
1426  */
1427 static int rs_move_legacy_other(struct iwl_priv *priv,
1428                                 struct iwl_lq_sta *lq_sta,
1429                                 struct ieee80211_conf *conf,
1430                                 struct ieee80211_sta *sta,
1431                                 int index)
1432 {
1433         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1434         struct iwl_scale_tbl_info *search_tbl =
1435                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1436         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1437         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1438                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1439         u8 start_action;
1440         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1441         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1442         int ret = 0;
1443         u8 update_search_tbl_counter = 0;
1444
1445         switch (priv->bt_traffic_load) {
1446         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1447                 /* nothing */
1448                 break;
1449         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1450                 /* avoid antenna B unless MIMO */
1451                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1452                 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1453                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1454                 break;
1455         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1456         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1457                 /* avoid antenna B and MIMO */
1458                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1459                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1460                     tbl->action != IWL_LEGACY_SWITCH_SISO)
1461                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1462                 break;
1463         default:
1464                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1465                 break;
1466         }
1467
1468         if (!iwl_ht_enabled(priv))
1469                 /* stay in Legacy */
1470                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1471         else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1472                    tbl->action > IWL_LEGACY_SWITCH_SISO)
1473                 tbl->action = IWL_LEGACY_SWITCH_SISO;
1474
1475         /* configure as 1x1 if bt full concurrency */
1476         if (priv->bt_full_concurrent) {
1477                 if (!iwl_ht_enabled(priv))
1478                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1479                 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1480                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1481                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1482         }
1483
1484         start_action = tbl->action;
1485         for (; ;) {
1486                 lq_sta->action_counter++;
1487                 switch (tbl->action) {
1488                 case IWL_LEGACY_SWITCH_ANTENNA1:
1489                 case IWL_LEGACY_SWITCH_ANTENNA2:
1490                         IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1491
1492                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1493                                                         tx_chains_num <= 1) ||
1494                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1495                                                         tx_chains_num <= 2))
1496                                 break;
1497
1498                         /* Don't change antenna if success has been great */
1499                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1500                             !priv->bt_full_concurrent &&
1501                             priv->bt_traffic_load ==
1502                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1503                                 break;
1504
1505                         /* Set up search table to try other antenna */
1506                         memcpy(search_tbl, tbl, sz);
1507
1508                         if (rs_toggle_antenna(valid_tx_ant,
1509                                 &search_tbl->current_rate, search_tbl)) {
1510                                 update_search_tbl_counter = 1;
1511                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1512                                 goto out;
1513                         }
1514                         break;
1515                 case IWL_LEGACY_SWITCH_SISO:
1516                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1517
1518                         /* Set up search table to try SISO */
1519                         memcpy(search_tbl, tbl, sz);
1520                         search_tbl->is_SGI = 0;
1521                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1522                                                  search_tbl, index);
1523                         if (!ret) {
1524                                 lq_sta->action_counter = 0;
1525                                 goto out;
1526                         }
1527
1528                         break;
1529                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1530                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1531                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1532                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1533
1534                         /* Set up search table to try MIMO */
1535                         memcpy(search_tbl, tbl, sz);
1536                         search_tbl->is_SGI = 0;
1537
1538                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1539                                 search_tbl->ant_type = ANT_AB;
1540                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1541                                 search_tbl->ant_type = ANT_AC;
1542                         else
1543                                 search_tbl->ant_type = ANT_BC;
1544
1545                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1546                                 break;
1547
1548                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1549                                                  search_tbl, index);
1550                         if (!ret) {
1551                                 lq_sta->action_counter = 0;
1552                                 goto out;
1553                         }
1554                         break;
1555
1556                 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1557                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1558
1559                         /* Set up search table to try MIMO3 */
1560                         memcpy(search_tbl, tbl, sz);
1561                         search_tbl->is_SGI = 0;
1562
1563                         search_tbl->ant_type = ANT_ABC;
1564
1565                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1566                                 break;
1567
1568                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1569                                                  search_tbl, index);
1570                         if (!ret) {
1571                                 lq_sta->action_counter = 0;
1572                                 goto out;
1573                         }
1574                         break;
1575                 }
1576                 tbl->action++;
1577                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1578                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1579
1580                 if (tbl->action == start_action)
1581                         break;
1582
1583         }
1584         search_tbl->lq_type = LQ_NONE;
1585         return 0;
1586
1587 out:
1588         lq_sta->search_better_tbl = 1;
1589         tbl->action++;
1590         if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1591                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1592         if (update_search_tbl_counter)
1593                 search_tbl->action = tbl->action;
1594         return 0;
1595
1596 }
1597
1598 /*
1599  * Try to switch to new modulation mode from SISO
1600  */
1601 static int rs_move_siso_to_other(struct iwl_priv *priv,
1602                                  struct iwl_lq_sta *lq_sta,
1603                                  struct ieee80211_conf *conf,
1604                                  struct ieee80211_sta *sta, int index)
1605 {
1606         u8 is_green = lq_sta->is_green;
1607         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1608         struct iwl_scale_tbl_info *search_tbl =
1609                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1610         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1611         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1612         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1613                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1614         u8 start_action;
1615         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1616         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1617         u8 update_search_tbl_counter = 0;
1618         int ret;
1619
1620         switch (priv->bt_traffic_load) {
1621         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1622                 /* nothing */
1623                 break;
1624         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1625                 /* avoid antenna B unless MIMO */
1626                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1627                 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1628                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1629                 break;
1630         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1631         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1632                 /* avoid antenna B and MIMO */
1633                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1634                 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1635                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1636                 break;
1637         default:
1638                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1639                 break;
1640         }
1641
1642         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1643             tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1644                 /* stay in SISO */
1645                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1646         }
1647
1648         /* configure as 1x1 if bt full concurrency */
1649         if (priv->bt_full_concurrent) {
1650                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1651                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1652                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1653         }
1654
1655         start_action = tbl->action;
1656         for (;;) {
1657                 lq_sta->action_counter++;
1658                 switch (tbl->action) {
1659                 case IWL_SISO_SWITCH_ANTENNA1:
1660                 case IWL_SISO_SWITCH_ANTENNA2:
1661                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1662                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1663                                                 tx_chains_num <= 1) ||
1664                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1665                                                 tx_chains_num <= 2))
1666                                 break;
1667
1668                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1669                             !priv->bt_full_concurrent &&
1670                             priv->bt_traffic_load ==
1671                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1672                                 break;
1673
1674                         memcpy(search_tbl, tbl, sz);
1675                         if (rs_toggle_antenna(valid_tx_ant,
1676                                        &search_tbl->current_rate, search_tbl)) {
1677                                 update_search_tbl_counter = 1;
1678                                 goto out;
1679                         }
1680                         break;
1681                 case IWL_SISO_SWITCH_MIMO2_AB:
1682                 case IWL_SISO_SWITCH_MIMO2_AC:
1683                 case IWL_SISO_SWITCH_MIMO2_BC:
1684                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1685                         memcpy(search_tbl, tbl, sz);
1686                         search_tbl->is_SGI = 0;
1687
1688                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1689                                 search_tbl->ant_type = ANT_AB;
1690                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1691                                 search_tbl->ant_type = ANT_AC;
1692                         else
1693                                 search_tbl->ant_type = ANT_BC;
1694
1695                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1696                                 break;
1697
1698                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1699                                                  search_tbl, index);
1700                         if (!ret)
1701                                 goto out;
1702                         break;
1703                 case IWL_SISO_SWITCH_GI:
1704                         if (!tbl->is_ht40 && !(ht_cap->cap &
1705                                                 IEEE80211_HT_CAP_SGI_20))
1706                                 break;
1707                         if (tbl->is_ht40 && !(ht_cap->cap &
1708                                                 IEEE80211_HT_CAP_SGI_40))
1709                                 break;
1710
1711                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1712
1713                         memcpy(search_tbl, tbl, sz);
1714                         if (is_green) {
1715                                 if (!tbl->is_SGI)
1716                                         break;
1717                                 else
1718                                         IWL_ERR(priv,
1719                                                 "SGI was set in GF+SISO\n");
1720                         }
1721                         search_tbl->is_SGI = !tbl->is_SGI;
1722                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1723                         if (tbl->is_SGI) {
1724                                 s32 tpt = lq_sta->last_tpt / 100;
1725                                 if (tpt >= search_tbl->expected_tpt[index])
1726                                         break;
1727                         }
1728                         search_tbl->current_rate =
1729                                 rate_n_flags_from_tbl(priv, search_tbl,
1730                                                       index, is_green);
1731                         update_search_tbl_counter = 1;
1732                         goto out;
1733                 case IWL_SISO_SWITCH_MIMO3_ABC:
1734                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1735                         memcpy(search_tbl, tbl, sz);
1736                         search_tbl->is_SGI = 0;
1737                         search_tbl->ant_type = ANT_ABC;
1738
1739                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1740                                 break;
1741
1742                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1743                                                  search_tbl, index);
1744                         if (!ret)
1745                                 goto out;
1746                         break;
1747                 }
1748                 tbl->action++;
1749                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1750                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1751
1752                 if (tbl->action == start_action)
1753                         break;
1754         }
1755         search_tbl->lq_type = LQ_NONE;
1756         return 0;
1757
1758  out:
1759         lq_sta->search_better_tbl = 1;
1760         tbl->action++;
1761         if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1762                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1763         if (update_search_tbl_counter)
1764                 search_tbl->action = tbl->action;
1765
1766         return 0;
1767 }
1768
1769 /*
1770  * Try to switch to new modulation mode from MIMO2
1771  */
1772 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1773                                  struct iwl_lq_sta *lq_sta,
1774                                  struct ieee80211_conf *conf,
1775                                  struct ieee80211_sta *sta, int index)
1776 {
1777         s8 is_green = lq_sta->is_green;
1778         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1779         struct iwl_scale_tbl_info *search_tbl =
1780                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1781         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1782         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1783         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1784                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1785         u8 start_action;
1786         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1787         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1788         u8 update_search_tbl_counter = 0;
1789         int ret;
1790
1791         switch (priv->bt_traffic_load) {
1792         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1793                 /* nothing */
1794                 break;
1795         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1796         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1797                 /* avoid antenna B and MIMO */
1798                 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1799                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1800                 break;
1801         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1802                 /* avoid antenna B unless MIMO */
1803                 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1804                     tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1805                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1806                 break;
1807         default:
1808                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1809                 break;
1810         }
1811
1812         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1813             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1814              tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1815                 /* switch in SISO */
1816                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1817         }
1818
1819         /* configure as 1x1 if bt full concurrency */
1820         if (priv->bt_full_concurrent &&
1821             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1822              tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1823                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1824
1825         start_action = tbl->action;
1826         for (;;) {
1827                 lq_sta->action_counter++;
1828                 switch (tbl->action) {
1829                 case IWL_MIMO2_SWITCH_ANTENNA1:
1830                 case IWL_MIMO2_SWITCH_ANTENNA2:
1831                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1832
1833                         if (tx_chains_num <= 2)
1834                                 break;
1835
1836                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1837                                 break;
1838
1839                         memcpy(search_tbl, tbl, sz);
1840                         if (rs_toggle_antenna(valid_tx_ant,
1841                                        &search_tbl->current_rate, search_tbl)) {
1842                                 update_search_tbl_counter = 1;
1843                                 goto out;
1844                         }
1845                         break;
1846                 case IWL_MIMO2_SWITCH_SISO_A:
1847                 case IWL_MIMO2_SWITCH_SISO_B:
1848                 case IWL_MIMO2_SWITCH_SISO_C:
1849                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1850
1851                         /* Set up new search table for SISO */
1852                         memcpy(search_tbl, tbl, sz);
1853
1854                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1855                                 search_tbl->ant_type = ANT_A;
1856                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1857                                 search_tbl->ant_type = ANT_B;
1858                         else
1859                                 search_tbl->ant_type = ANT_C;
1860
1861                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1862                                 break;
1863
1864                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1865                                                  search_tbl, index);
1866                         if (!ret)
1867                                 goto out;
1868
1869                         break;
1870
1871                 case IWL_MIMO2_SWITCH_GI:
1872                         if (!tbl->is_ht40 && !(ht_cap->cap &
1873                                                 IEEE80211_HT_CAP_SGI_20))
1874                                 break;
1875                         if (tbl->is_ht40 && !(ht_cap->cap &
1876                                                 IEEE80211_HT_CAP_SGI_40))
1877                                 break;
1878
1879                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1880
1881                         /* Set up new search table for MIMO2 */
1882                         memcpy(search_tbl, tbl, sz);
1883                         search_tbl->is_SGI = !tbl->is_SGI;
1884                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1885                         /*
1886                          * If active table already uses the fastest possible
1887                          * modulation (dual stream with short guard interval),
1888                          * and it's working well, there's no need to look
1889                          * for a better type of modulation!
1890                          */
1891                         if (tbl->is_SGI) {
1892                                 s32 tpt = lq_sta->last_tpt / 100;
1893                                 if (tpt >= search_tbl->expected_tpt[index])
1894                                         break;
1895                         }
1896                         search_tbl->current_rate =
1897                                 rate_n_flags_from_tbl(priv, search_tbl,
1898                                                       index, is_green);
1899                         update_search_tbl_counter = 1;
1900                         goto out;
1901
1902                 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1903                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1904                         memcpy(search_tbl, tbl, sz);
1905                         search_tbl->is_SGI = 0;
1906                         search_tbl->ant_type = ANT_ABC;
1907
1908                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1909                                 break;
1910
1911                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1912                                                  search_tbl, index);
1913                         if (!ret)
1914                                 goto out;
1915
1916                         break;
1917                 }
1918                 tbl->action++;
1919                 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1920                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1921
1922                 if (tbl->action == start_action)
1923                         break;
1924         }
1925         search_tbl->lq_type = LQ_NONE;
1926         return 0;
1927  out:
1928         lq_sta->search_better_tbl = 1;
1929         tbl->action++;
1930         if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1931                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1932         if (update_search_tbl_counter)
1933                 search_tbl->action = tbl->action;
1934
1935         return 0;
1936
1937 }
1938
1939 /*
1940  * Try to switch to new modulation mode from MIMO3
1941  */
1942 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1943                                  struct iwl_lq_sta *lq_sta,
1944                                  struct ieee80211_conf *conf,
1945                                  struct ieee80211_sta *sta, int index)
1946 {
1947         s8 is_green = lq_sta->is_green;
1948         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1949         struct iwl_scale_tbl_info *search_tbl =
1950                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1951         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1952         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1953         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1954                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1955         u8 start_action;
1956         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1957         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1958         int ret;
1959         u8 update_search_tbl_counter = 0;
1960
1961         switch (priv->bt_traffic_load) {
1962         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1963                 /* nothing */
1964                 break;
1965         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1966         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1967                 /* avoid antenna B and MIMO */
1968                 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1969                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1970                 break;
1971         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1972                 /* avoid antenna B unless MIMO */
1973                 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1974                     tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1975                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1976                 break;
1977         default:
1978                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1979                 break;
1980         }
1981
1982         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1983             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1984              tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1985                 /* switch in SISO */
1986                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1987         }
1988
1989         /* configure as 1x1 if bt full concurrency */
1990         if (priv->bt_full_concurrent &&
1991             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1992              tbl->action > IWL_MIMO3_SWITCH_SISO_C))
1993                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1994
1995         start_action = tbl->action;
1996         for (;;) {
1997                 lq_sta->action_counter++;
1998                 switch (tbl->action) {
1999                 case IWL_MIMO3_SWITCH_ANTENNA1:
2000                 case IWL_MIMO3_SWITCH_ANTENNA2:
2001                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
2002
2003                         if (tx_chains_num <= 3)
2004                                 break;
2005
2006                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2007                                 break;
2008
2009                         memcpy(search_tbl, tbl, sz);
2010                         if (rs_toggle_antenna(valid_tx_ant,
2011                                        &search_tbl->current_rate, search_tbl))
2012                                 goto out;
2013                         break;
2014                 case IWL_MIMO3_SWITCH_SISO_A:
2015                 case IWL_MIMO3_SWITCH_SISO_B:
2016                 case IWL_MIMO3_SWITCH_SISO_C:
2017                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2018
2019                         /* Set up new search table for SISO */
2020                         memcpy(search_tbl, tbl, sz);
2021
2022                         if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2023                                 search_tbl->ant_type = ANT_A;
2024                         else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2025                                 search_tbl->ant_type = ANT_B;
2026                         else
2027                                 search_tbl->ant_type = ANT_C;
2028
2029                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2030                                 break;
2031
2032                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2033                                                  search_tbl, index);
2034                         if (!ret)
2035                                 goto out;
2036
2037                         break;
2038
2039                 case IWL_MIMO3_SWITCH_MIMO2_AB:
2040                 case IWL_MIMO3_SWITCH_MIMO2_AC:
2041                 case IWL_MIMO3_SWITCH_MIMO2_BC:
2042                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2043
2044                         memcpy(search_tbl, tbl, sz);
2045                         search_tbl->is_SGI = 0;
2046                         if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2047                                 search_tbl->ant_type = ANT_AB;
2048                         else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2049                                 search_tbl->ant_type = ANT_AC;
2050                         else
2051                                 search_tbl->ant_type = ANT_BC;
2052
2053                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2054                                 break;
2055
2056                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2057                                                  search_tbl, index);
2058                         if (!ret)
2059                                 goto out;
2060
2061                         break;
2062
2063                 case IWL_MIMO3_SWITCH_GI:
2064                         if (!tbl->is_ht40 && !(ht_cap->cap &
2065                                                 IEEE80211_HT_CAP_SGI_20))
2066                                 break;
2067                         if (tbl->is_ht40 && !(ht_cap->cap &
2068                                                 IEEE80211_HT_CAP_SGI_40))
2069                                 break;
2070
2071                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2072
2073                         /* Set up new search table for MIMO */
2074                         memcpy(search_tbl, tbl, sz);
2075                         search_tbl->is_SGI = !tbl->is_SGI;
2076                         rs_set_expected_tpt_table(lq_sta, search_tbl);
2077                         /*
2078                          * If active table already uses the fastest possible
2079                          * modulation (dual stream with short guard interval),
2080                          * and it's working well, there's no need to look
2081                          * for a better type of modulation!
2082                          */
2083                         if (tbl->is_SGI) {
2084                                 s32 tpt = lq_sta->last_tpt / 100;
2085                                 if (tpt >= search_tbl->expected_tpt[index])
2086                                         break;
2087                         }
2088                         search_tbl->current_rate =
2089                                 rate_n_flags_from_tbl(priv, search_tbl,
2090                                                       index, is_green);
2091                         update_search_tbl_counter = 1;
2092                         goto out;
2093                 }
2094                 tbl->action++;
2095                 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2096                         tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2097
2098                 if (tbl->action == start_action)
2099                         break;
2100         }
2101         search_tbl->lq_type = LQ_NONE;
2102         return 0;
2103  out:
2104         lq_sta->search_better_tbl = 1;
2105         tbl->action++;
2106         if (tbl->action > IWL_MIMO3_SWITCH_GI)
2107                 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2108         if (update_search_tbl_counter)
2109                 search_tbl->action = tbl->action;
2110
2111         return 0;
2112
2113 }
2114
2115 /*
2116  * Check whether we should continue using same modulation mode, or
2117  * begin search for a new mode, based on:
2118  * 1) # tx successes or failures while using this mode
2119  * 2) # times calling this function
2120  * 3) elapsed time in this mode (not used, for now)
2121  */
2122 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2123 {
2124         struct iwl_scale_tbl_info *tbl;
2125         int i;
2126         int active_tbl;
2127         int flush_interval_passed = 0;
2128         struct iwl_priv *priv;
2129
2130         priv = lq_sta->drv;
2131         active_tbl = lq_sta->active_tbl;
2132
2133         tbl = &(lq_sta->lq_info[active_tbl]);
2134
2135         /* If we've been disallowing search, see if we should now allow it */
2136         if (lq_sta->stay_in_tbl) {
2137
2138                 /* Elapsed time using current modulation mode */
2139                 if (lq_sta->flush_timer)
2140                         flush_interval_passed =
2141                         time_after(jiffies,
2142                                         (unsigned long)(lq_sta->flush_timer +
2143                                         IWL_RATE_SCALE_FLUSH_INTVL));
2144
2145                 /*
2146                  * Check if we should allow search for new modulation mode.
2147                  * If many frames have failed or succeeded, or we've used
2148                  * this same modulation for a long time, allow search, and
2149                  * reset history stats that keep track of whether we should
2150                  * allow a new search.  Also (below) reset all bitmaps and
2151                  * stats in active history.
2152                  */
2153                 if (force_search ||
2154                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2155                     (lq_sta->total_success > lq_sta->max_success_limit) ||
2156                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2157                      && (flush_interval_passed))) {
2158                         IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
2159                                      lq_sta->total_failed,
2160                                      lq_sta->total_success,
2161                                      flush_interval_passed);
2162
2163                         /* Allow search for new mode */
2164                         lq_sta->stay_in_tbl = 0;        /* only place reset */
2165                         lq_sta->total_failed = 0;
2166                         lq_sta->total_success = 0;
2167                         lq_sta->flush_timer = 0;
2168
2169                 /*
2170                  * Else if we've used this modulation mode enough repetitions
2171                  * (regardless of elapsed time or success/failure), reset
2172                  * history bitmaps and rate-specific stats for all rates in
2173                  * active table.
2174                  */
2175                 } else {
2176                         lq_sta->table_count++;
2177                         if (lq_sta->table_count >=
2178                             lq_sta->table_count_limit) {
2179                                 lq_sta->table_count = 0;
2180
2181                                 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2182                                 for (i = 0; i < IWL_RATE_COUNT; i++)
2183                                         rs_rate_scale_clear_window(
2184                                                 &(tbl->win[i]));
2185                         }
2186                 }
2187
2188                 /* If transitioning to allow "search", reset all history
2189                  * bitmaps and stats in active table (this will become the new
2190                  * "search" table). */
2191                 if (!lq_sta->stay_in_tbl) {
2192                         for (i = 0; i < IWL_RATE_COUNT; i++)
2193                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2194                 }
2195         }
2196 }
2197
2198 /*
2199  * setup rate table in uCode
2200  * return rate_n_flags as used in the table
2201  */
2202 static void rs_update_rate_tbl(struct iwl_priv *priv,
2203                                struct iwl_rxon_context *ctx,
2204                                struct iwl_lq_sta *lq_sta,
2205                                struct iwl_scale_tbl_info *tbl,
2206                                int index, u8 is_green)
2207 {
2208         u32 rate;
2209
2210         /* Update uCode's rate table. */
2211         rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2212         rs_fill_link_cmd(priv, lq_sta, rate);
2213         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2214 }
2215
2216 /*
2217  * Do rate scaling and search for new modulation mode.
2218  */
2219 static void rs_rate_scale_perform(struct iwl_priv *priv,
2220                                   struct sk_buff *skb,
2221                                   struct ieee80211_sta *sta,
2222                                   struct iwl_lq_sta *lq_sta)
2223 {
2224         struct ieee80211_hw *hw = priv->hw;
2225         struct ieee80211_conf *conf = &hw->conf;
2226         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2227         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2228         int low = IWL_RATE_INVALID;
2229         int high = IWL_RATE_INVALID;
2230         int index;
2231         int i;
2232         struct iwl_rate_scale_data *window = NULL;
2233         int current_tpt = IWL_INVALID_VALUE;
2234         int low_tpt = IWL_INVALID_VALUE;
2235         int high_tpt = IWL_INVALID_VALUE;
2236         u32 fail_count;
2237         s8 scale_action = 0;
2238         u16 rate_mask;
2239         u8 update_lq = 0;
2240         struct iwl_scale_tbl_info *tbl, *tbl1;
2241         u16 rate_scale_index_msk = 0;
2242         u8 is_green = 0;
2243         u8 active_tbl = 0;
2244         u8 done_search = 0;
2245         u16 high_low;
2246         s32 sr;
2247         u8 tid = MAX_TID_COUNT;
2248         struct iwl_tid_data *tid_data;
2249         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2250         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
2251
2252         IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2253
2254         /* Send management frames and NO_ACK data using lowest rate. */
2255         /* TODO: this could probably be improved.. */
2256         if (!ieee80211_is_data(hdr->frame_control) ||
2257             info->flags & IEEE80211_TX_CTL_NO_ACK)
2258                 return;
2259
2260         if (!sta || !lq_sta)
2261                 return;
2262
2263         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2264
2265         tid = rs_tl_add_packet(lq_sta, hdr);
2266         if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
2267                 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
2268                 if (tid_data->agg.state == IWL_AGG_OFF)
2269                         lq_sta->is_agg = 0;
2270                 else
2271                         lq_sta->is_agg = 1;
2272         } else
2273                 lq_sta->is_agg = 0;
2274
2275         /*
2276          * Select rate-scale / modulation-mode table to work with in
2277          * the rest of this function:  "search" if searching for better
2278          * modulation mode, or "active" if doing rate scaling within a mode.
2279          */
2280         if (!lq_sta->search_better_tbl)
2281                 active_tbl = lq_sta->active_tbl;
2282         else
2283                 active_tbl = 1 - lq_sta->active_tbl;
2284
2285         tbl = &(lq_sta->lq_info[active_tbl]);
2286         if (is_legacy(tbl->lq_type))
2287                 lq_sta->is_green = 0;
2288         else
2289                 lq_sta->is_green = rs_use_green(sta);
2290         is_green = lq_sta->is_green;
2291
2292         /* current tx rate */
2293         index = lq_sta->last_txrate_idx;
2294
2295         IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2296                        tbl->lq_type);
2297
2298         /* rates available for this association, and for modulation mode */
2299         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2300
2301         IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2302
2303         /* mask with station rate restriction */
2304         if (is_legacy(tbl->lq_type)) {
2305                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2306                         /* supp_rates has no CCK bits in A mode */
2307                         rate_scale_index_msk = (u16) (rate_mask &
2308                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2309                 else
2310                         rate_scale_index_msk = (u16) (rate_mask &
2311                                                       lq_sta->supp_rates);
2312
2313         } else
2314                 rate_scale_index_msk = rate_mask;
2315
2316         if (!rate_scale_index_msk)
2317                 rate_scale_index_msk = rate_mask;
2318
2319         if (!((1 << index) & rate_scale_index_msk)) {
2320                 IWL_ERR(priv, "Current Rate is not valid\n");
2321                 if (lq_sta->search_better_tbl) {
2322                         /* revert to active table if search table is not valid*/
2323                         tbl->lq_type = LQ_NONE;
2324                         lq_sta->search_better_tbl = 0;
2325                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2326                         /* get "active" rate info */
2327                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2328                         rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2329                                            index, is_green);
2330                 }
2331                 return;
2332         }
2333
2334         /* Get expected throughput table and history window for current rate */
2335         if (!tbl->expected_tpt) {
2336                 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2337                 return;
2338         }
2339
2340         /* force user max rate if set by user */
2341         if ((lq_sta->max_rate_idx != -1) &&
2342             (lq_sta->max_rate_idx < index)) {
2343                 index = lq_sta->max_rate_idx;
2344                 update_lq = 1;
2345                 window = &(tbl->win[index]);
2346                 goto lq_update;
2347         }
2348
2349         window = &(tbl->win[index]);
2350
2351         /*
2352          * If there is not enough history to calculate actual average
2353          * throughput, keep analyzing results of more tx frames, without
2354          * changing rate or mode (bypass most of the rest of this function).
2355          * Set up new rate table in uCode only if old rate is not supported
2356          * in current association (use new rate found above).
2357          */
2358         fail_count = window->counter - window->success_counter;
2359         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2360                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2361                 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2362                                "for index %d\n",
2363                                window->success_counter, window->counter, index);
2364
2365                 /* Can't calculate this yet; not enough history */
2366                 window->average_tpt = IWL_INVALID_VALUE;
2367
2368                 /* Should we stay with this modulation mode,
2369                  * or search for a new one? */
2370                 rs_stay_in_table(lq_sta, false);
2371
2372                 goto out;
2373         }
2374         /* Else we have enough samples; calculate estimate of
2375          * actual average throughput */
2376         if (window->average_tpt != ((window->success_ratio *
2377                         tbl->expected_tpt[index] + 64) / 128)) {
2378                 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2379                 window->average_tpt = ((window->success_ratio *
2380                                         tbl->expected_tpt[index] + 64) / 128);
2381         }
2382
2383         /* If we are searching for better modulation mode, check success. */
2384         if (lq_sta->search_better_tbl &&
2385             (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2386                 /* If good success, continue using the "search" mode;
2387                  * no need to send new link quality command, since we're
2388                  * continuing to use the setup that we've been trying. */
2389                 if (window->average_tpt > lq_sta->last_tpt) {
2390
2391                         IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2392                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2393                                         window->success_ratio,
2394                                         window->average_tpt,
2395                                         lq_sta->last_tpt);
2396
2397                         if (!is_legacy(tbl->lq_type))
2398                                 lq_sta->enable_counter = 1;
2399
2400                         /* Swap tables; "search" becomes "active" */
2401                         lq_sta->active_tbl = active_tbl;
2402                         current_tpt = window->average_tpt;
2403
2404                 /* Else poor success; go back to mode in "active" table */
2405                 } else {
2406
2407                         IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2408                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2409                                         window->success_ratio,
2410                                         window->average_tpt,
2411                                         lq_sta->last_tpt);
2412
2413                         /* Nullify "search" table */
2414                         tbl->lq_type = LQ_NONE;
2415
2416                         /* Revert to "active" table */
2417                         active_tbl = lq_sta->active_tbl;
2418                         tbl = &(lq_sta->lq_info[active_tbl]);
2419
2420                         /* Revert to "active" rate and throughput info */
2421                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2422                         current_tpt = lq_sta->last_tpt;
2423
2424                         /* Need to set up a new rate table in uCode */
2425                         update_lq = 1;
2426                 }
2427
2428                 /* Either way, we've made a decision; modulation mode
2429                  * search is done, allow rate adjustment next time. */
2430                 lq_sta->search_better_tbl = 0;
2431                 done_search = 1;        /* Don't switch modes below! */
2432                 goto lq_update;
2433         }
2434
2435         /* (Else) not in search of better modulation mode, try for better
2436          * starting rate, while staying in this mode. */
2437         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2438                                         tbl->lq_type);
2439         low = high_low & 0xff;
2440         high = (high_low >> 8) & 0xff;
2441
2442         /* If user set max rate, dont allow higher than user constrain */
2443         if ((lq_sta->max_rate_idx != -1) &&
2444             (lq_sta->max_rate_idx < high))
2445                 high = IWL_RATE_INVALID;
2446
2447         sr = window->success_ratio;
2448
2449         /* Collect measured throughputs for current and adjacent rates */
2450         current_tpt = window->average_tpt;
2451         if (low != IWL_RATE_INVALID)
2452                 low_tpt = tbl->win[low].average_tpt;
2453         if (high != IWL_RATE_INVALID)
2454                 high_tpt = tbl->win[high].average_tpt;
2455
2456         scale_action = 0;
2457
2458         /* Too many failures, decrease rate */
2459         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2460                 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2461                 scale_action = -1;
2462
2463         /* No throughput measured yet for adjacent rates; try increase. */
2464         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2465                    (high_tpt == IWL_INVALID_VALUE)) {
2466
2467                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2468                         scale_action = 1;
2469                 else if (low != IWL_RATE_INVALID)
2470                         scale_action = 0;
2471         }
2472
2473         /* Both adjacent throughputs are measured, but neither one has better
2474          * throughput; we're using the best rate, don't change it! */
2475         else if ((low_tpt != IWL_INVALID_VALUE) &&
2476                  (high_tpt != IWL_INVALID_VALUE) &&
2477                  (low_tpt < current_tpt) &&
2478                  (high_tpt < current_tpt))
2479                 scale_action = 0;
2480
2481         /* At least one adjacent rate's throughput is measured,
2482          * and may have better performance. */
2483         else {
2484                 /* Higher adjacent rate's throughput is measured */
2485                 if (high_tpt != IWL_INVALID_VALUE) {
2486                         /* Higher rate has better throughput */
2487                         if (high_tpt > current_tpt &&
2488                                         sr >= IWL_RATE_INCREASE_TH) {
2489                                 scale_action = 1;
2490                         } else {
2491                                 scale_action = 0;
2492                         }
2493
2494                 /* Lower adjacent rate's throughput is measured */
2495                 } else if (low_tpt != IWL_INVALID_VALUE) {
2496                         /* Lower rate has better throughput */
2497                         if (low_tpt > current_tpt) {
2498                                 IWL_DEBUG_RATE(priv,
2499                                     "decrease rate because of low tpt\n");
2500                                 scale_action = -1;
2501                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2502                                 scale_action = 1;
2503                         }
2504                 }
2505         }
2506
2507         /* Sanity check; asked for decrease, but success rate or throughput
2508          * has been good at old rate.  Don't change it. */
2509         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2510                     ((sr > IWL_RATE_HIGH_TH) ||
2511                      (current_tpt > (100 * tbl->expected_tpt[low]))))
2512                 scale_action = 0;
2513         if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2514                 scale_action = -1;
2515         if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2516                 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2517                 scale_action = -1;
2518
2519         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2520              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2521                 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2522                         /*
2523                          * don't set scale_action, don't want to scale up if
2524                          * the rate scale doesn't otherwise think that is a
2525                          * good idea.
2526                          */
2527                 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2528                         scale_action = -1;
2529                 }
2530         }
2531         lq_sta->last_bt_traffic = priv->bt_traffic_load;
2532
2533         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2534              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2535                 /* search for a new modulation */
2536                 rs_stay_in_table(lq_sta, true);
2537                 goto lq_update;
2538         }
2539
2540         switch (scale_action) {
2541         case -1:
2542                 /* Decrease starting rate, update uCode's rate table */
2543                 if (low != IWL_RATE_INVALID) {
2544                         update_lq = 1;
2545                         index = low;
2546                 }
2547
2548                 break;
2549         case 1:
2550                 /* Increase starting rate, update uCode's rate table */
2551                 if (high != IWL_RATE_INVALID) {
2552                         update_lq = 1;
2553                         index = high;
2554                 }
2555
2556                 break;
2557         case 0:
2558                 /* No change */
2559         default:
2560                 break;
2561         }
2562
2563         IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2564                     "high %d type %d\n",
2565                      index, scale_action, low, high, tbl->lq_type);
2566
2567 lq_update:
2568         /* Replace uCode's rate table for the destination station. */
2569         if (update_lq)
2570                 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2571
2572         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2573                 /* Should we stay with this modulation mode,
2574                  * or search for a new one? */
2575           rs_stay_in_table(lq_sta, false);
2576         }
2577         /*
2578          * Search for new modulation mode if we're:
2579          * 1)  Not changing rates right now
2580          * 2)  Not just finishing up a search
2581          * 3)  Allowing a new search
2582          */
2583         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2584                 /* Save current throughput to compare with "search" throughput*/
2585                 lq_sta->last_tpt = current_tpt;
2586
2587                 /* Select a new "search" modulation mode to try.
2588                  * If one is found, set up the new "search" table. */
2589                 if (is_legacy(tbl->lq_type))
2590                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2591                 else if (is_siso(tbl->lq_type))
2592                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2593                 else if (is_mimo2(tbl->lq_type))
2594                         rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2595                 else
2596                         rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2597
2598                 /* If new "search" mode was selected, set up in uCode table */
2599                 if (lq_sta->search_better_tbl) {
2600                         /* Access the "search" table, clear its history. */
2601                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2602                         for (i = 0; i < IWL_RATE_COUNT; i++)
2603                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2604
2605                         /* Use new "search" start rate */
2606                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2607
2608                         IWL_DEBUG_RATE(priv, "Switch current  mcs: %X index: %d\n",
2609                                      tbl->current_rate, index);
2610                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2611                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2612                 } else
2613                         done_search = 1;
2614         }
2615
2616         if (done_search && !lq_sta->stay_in_tbl) {
2617                 /* If the "active" (non-search) mode was legacy,
2618                  * and we've tried switching antennas,
2619                  * but we haven't been able to try HT modes (not available),
2620                  * stay with best antenna legacy modulation for a while
2621                  * before next round of mode comparisons. */
2622                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2623                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2624                     lq_sta->action_counter > tbl1->max_search) {
2625                         IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2626                         rs_set_stay_in_table(priv, 1, lq_sta);
2627                 }
2628
2629                 /* If we're in an HT mode, and all 3 mode switch actions
2630                  * have been tried and compared, stay in this best modulation
2631                  * mode for a while before next round of mode comparisons. */
2632                 if (lq_sta->enable_counter &&
2633                     (lq_sta->action_counter >= tbl1->max_search) &&
2634                     iwl_ht_enabled(priv)) {
2635                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2636                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2637                             (tid != MAX_TID_COUNT)) {
2638                                 tid_data =
2639                                    &priv->stations[lq_sta->lq.sta_id].tid[tid];
2640                                 if (tid_data->agg.state == IWL_AGG_OFF) {
2641                                         IWL_DEBUG_RATE(priv,
2642                                                        "try to aggregate tid %d\n",
2643                                                        tid);
2644                                         rs_tl_turn_on_agg(priv, tid,
2645                                                           lq_sta, sta);
2646                                 }
2647                         }
2648                         rs_set_stay_in_table(priv, 0, lq_sta);
2649                 }
2650         }
2651
2652 out:
2653         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2654         i = index;
2655         lq_sta->last_txrate_idx = i;
2656 }
2657
2658 /**
2659  * rs_initialize_lq - Initialize a station's hardware rate table
2660  *
2661  * The uCode's station table contains a table of fallback rates
2662  * for automatic fallback during transmission.
2663  *
2664  * NOTE: This sets up a default set of values.  These will be replaced later
2665  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2666  *       rc80211_simple.
2667  *
2668  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2669  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2670  *       which requires station table entry to exist).
2671  */
2672 static void rs_initialize_lq(struct iwl_priv *priv,
2673                              struct ieee80211_conf *conf,
2674                              struct ieee80211_sta *sta,
2675                              struct iwl_lq_sta *lq_sta)
2676 {
2677         struct iwl_scale_tbl_info *tbl;
2678         int rate_idx;
2679         int i;
2680         u32 rate;
2681         u8 use_green = rs_use_green(sta);
2682         u8 active_tbl = 0;
2683         u8 valid_tx_ant;
2684         struct iwl_station_priv *sta_priv;
2685         struct iwl_rxon_context *ctx;
2686
2687         if (!sta || !lq_sta)
2688                 return;
2689
2690         sta_priv = (void *)sta->drv_priv;
2691         ctx = sta_priv->common.ctx;
2692
2693         i = lq_sta->last_txrate_idx;
2694
2695         valid_tx_ant = priv->hw_params.valid_tx_ant;
2696
2697         if (!lq_sta->search_better_tbl)
2698                 active_tbl = lq_sta->active_tbl;
2699         else
2700                 active_tbl = 1 - lq_sta->active_tbl;
2701
2702         tbl = &(lq_sta->lq_info[active_tbl]);
2703
2704         if ((i < 0) || (i >= IWL_RATE_COUNT))
2705                 i = 0;
2706
2707         rate = iwl_rates[i].plcp;
2708         tbl->ant_type = first_antenna(valid_tx_ant);
2709         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2710
2711         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2712                 rate |= RATE_MCS_CCK_MSK;
2713
2714         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2715         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2716             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2717
2718         rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2719         tbl->current_rate = rate;
2720         rs_set_expected_tpt_table(lq_sta, tbl);
2721         rs_fill_link_cmd(NULL, lq_sta, rate);
2722         priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2723         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2724 }
2725
2726 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2727                         struct ieee80211_tx_rate_control *txrc)
2728 {
2729
2730         struct sk_buff *skb = txrc->skb;
2731         struct ieee80211_supported_band *sband = txrc->sband;
2732         struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2733         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2734         struct iwl_lq_sta *lq_sta = priv_sta;
2735         int rate_idx;
2736
2737         IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2738
2739         /* Get max rate if user set max rate */
2740         if (lq_sta) {
2741                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2742                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2743                     (lq_sta->max_rate_idx != -1))
2744                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2745                 if ((lq_sta->max_rate_idx < 0) ||
2746                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2747                         lq_sta->max_rate_idx = -1;
2748         }
2749
2750         /* Treat uninitialized rate scaling data same as non-existing. */
2751         if (lq_sta && !lq_sta->drv) {
2752                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2753                 priv_sta = NULL;
2754         }
2755
2756         /* Send management frames and NO_ACK data using lowest rate. */
2757         if (rate_control_send_low(sta, priv_sta, txrc))
2758                 return;
2759
2760         rate_idx  = lq_sta->last_txrate_idx;
2761
2762         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2763                 rate_idx -= IWL_FIRST_OFDM_RATE;
2764                 /* 6M and 9M shared same MCS index */
2765                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2766                 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2767                     IWL_RATE_MIMO3_6M_PLCP)
2768                         rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2769                 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2770                          IWL_RATE_MIMO2_6M_PLCP)
2771                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2772                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2773                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2774                         info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2775                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2776                         info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2777                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2778                         info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2779                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2780                         info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2781         } else {
2782                 /* Check for invalid rates */
2783                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2784                                 ((sband->band == IEEE80211_BAND_5GHZ) &&
2785                                  (rate_idx < IWL_FIRST_OFDM_RATE)))
2786                         rate_idx = rate_lowest_index(sband, sta);
2787                 /* On valid 5 GHz rate, adjust index */
2788                 else if (sband->band == IEEE80211_BAND_5GHZ)
2789                         rate_idx -= IWL_FIRST_OFDM_RATE;
2790                 info->control.rates[0].flags = 0;
2791         }
2792         info->control.rates[0].idx = rate_idx;
2793
2794 }
2795
2796 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2797                           gfp_t gfp)
2798 {
2799         struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2800         struct iwl_priv *priv;
2801
2802         priv = (struct iwl_priv *)priv_rate;
2803         IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2804
2805         return &sta_priv->lq_sta;
2806 }
2807
2808 /*
2809  * Called after adding a new station to initialize rate scaling
2810  */
2811 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2812 {
2813         int i, j;
2814         struct ieee80211_hw *hw = priv->hw;
2815         struct ieee80211_conf *conf = &priv->hw->conf;
2816         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2817         struct iwl_station_priv *sta_priv;
2818         struct iwl_lq_sta *lq_sta;
2819         struct ieee80211_supported_band *sband;
2820
2821         sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2822         lq_sta = &sta_priv->lq_sta;
2823         sband = hw->wiphy->bands[conf->channel->band];
2824
2825
2826         lq_sta->lq.sta_id = sta_id;
2827
2828         for (j = 0; j < LQ_SIZE; j++)
2829                 for (i = 0; i < IWL_RATE_COUNT; i++)
2830                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2831
2832         lq_sta->flush_timer = 0;
2833         lq_sta->supp_rates = sta->supp_rates[sband->band];
2834         for (j = 0; j < LQ_SIZE; j++)
2835                 for (i = 0; i < IWL_RATE_COUNT; i++)
2836                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2837
2838         IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2839                        sta_id);
2840         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2841          * the lowest or the highest rate.. Could consider using RSSI from
2842          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2843          * after assoc.. */
2844
2845         lq_sta->is_dup = 0;
2846         lq_sta->max_rate_idx = -1;
2847         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2848         lq_sta->is_green = rs_use_green(sta);
2849         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2850         lq_sta->band = priv->band;
2851         /*
2852          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2853          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2854          */
2855         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2856         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2857         lq_sta->active_siso_rate &= ~((u16)0x2);
2858         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2859
2860         /* Same here */
2861         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2862         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2863         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2864         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2865
2866         lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2867         lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2868         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2869         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2870
2871         IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2872                      lq_sta->active_siso_rate,
2873                      lq_sta->active_mimo2_rate,
2874                      lq_sta->active_mimo3_rate);
2875
2876         /* These values will be overridden later */
2877         lq_sta->lq.general_params.single_stream_ant_msk =
2878                 first_antenna(priv->hw_params.valid_tx_ant);
2879         lq_sta->lq.general_params.dual_stream_ant_msk =
2880                 priv->hw_params.valid_tx_ant &
2881                 ~first_antenna(priv->hw_params.valid_tx_ant);
2882         if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2883                 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2884         } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2885                 lq_sta->lq.general_params.dual_stream_ant_msk =
2886                         priv->hw_params.valid_tx_ant;
2887         }
2888
2889         /* as default allow aggregation for all tids */
2890         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2891         lq_sta->drv = priv;
2892
2893         /* Set last_txrate_idx to lowest rate */
2894         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2895         if (sband->band == IEEE80211_BAND_5GHZ)
2896                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2897         lq_sta->is_agg = 0;
2898
2899         priv->dbg_fixed_rate = 0;
2900 #ifdef CONFIG_MAC80211_DEBUGFS
2901         lq_sta->dbg_fixed_rate = 0;
2902 #endif
2903
2904         rs_initialize_lq(priv, conf, sta, lq_sta);
2905 }
2906
2907 static void rs_fill_link_cmd(struct iwl_priv *priv,
2908                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2909 {
2910         struct iwl_scale_tbl_info tbl_type;
2911         int index = 0;
2912         int rate_idx;
2913         int repeat_rate = 0;
2914         u8 ant_toggle_cnt = 0;
2915         u8 use_ht_possible = 1;
2916         u8 valid_tx_ant = 0;
2917         struct iwl_station_priv *sta_priv =
2918                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2919         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2920
2921         /* Override starting rate (index 0) if needed for debug purposes */
2922         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2923
2924         /* Interpret new_rate (rate_n_flags) */
2925         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2926                                   &tbl_type, &rate_idx);
2927
2928         if (priv && priv->bt_full_concurrent) {
2929                 /* 1x1 only */
2930                 tbl_type.ant_type =
2931                         first_antenna(priv->hw_params.valid_tx_ant);
2932         }
2933
2934         /* How many times should we repeat the initial rate? */
2935         if (is_legacy(tbl_type.lq_type)) {
2936                 ant_toggle_cnt = 1;
2937                 repeat_rate = IWL_NUMBER_TRY;
2938         } else {
2939                 repeat_rate = min(IWL_HT_NUMBER_TRY,
2940                                   LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2941         }
2942
2943         lq_cmd->general_params.mimo_delimiter =
2944                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2945
2946         /* Fill 1st table entry (index 0) */
2947         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2948
2949         if (num_of_ant(tbl_type.ant_type) == 1) {
2950                 lq_cmd->general_params.single_stream_ant_msk =
2951                                                 tbl_type.ant_type;
2952         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2953                 lq_cmd->general_params.dual_stream_ant_msk =
2954                                                 tbl_type.ant_type;
2955         } /* otherwise we don't modify the existing value */
2956
2957         index++;
2958         repeat_rate--;
2959         if (priv) {
2960                 if (priv->bt_full_concurrent)
2961                         valid_tx_ant = ANT_A;
2962                 else
2963                         valid_tx_ant = priv->hw_params.valid_tx_ant;
2964         }
2965
2966         /* Fill rest of rate table */
2967         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2968                 /* Repeat initial/next rate.
2969                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2970                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2971                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2972                         if (is_legacy(tbl_type.lq_type)) {
2973                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2974                                         ant_toggle_cnt++;
2975                                 else if (priv &&
2976                                          rs_toggle_antenna(valid_tx_ant,
2977                                                         &new_rate, &tbl_type))
2978                                         ant_toggle_cnt = 1;
2979                         }
2980
2981                         /* Override next rate if needed for debug purposes */
2982                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2983
2984                         /* Fill next table entry */
2985                         lq_cmd->rs_table[index].rate_n_flags =
2986                                         cpu_to_le32(new_rate);
2987                         repeat_rate--;
2988                         index++;
2989                 }
2990
2991                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2992                                                 &rate_idx);
2993
2994                 if (priv && priv->bt_full_concurrent) {
2995                         /* 1x1 only */
2996                         tbl_type.ant_type =
2997                                 first_antenna(priv->hw_params.valid_tx_ant);
2998                 }
2999
3000                 /* Indicate to uCode which entries might be MIMO.
3001                  * If initial rate was MIMO, this will finally end up
3002                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
3003                 if (is_mimo(tbl_type.lq_type))
3004                         lq_cmd->general_params.mimo_delimiter = index;
3005
3006                 /* Get next rate */
3007                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3008                                              use_ht_possible);
3009
3010                 /* How many times should we repeat the next rate? */
3011                 if (is_legacy(tbl_type.lq_type)) {
3012                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3013                                 ant_toggle_cnt++;
3014                         else if (priv &&
3015                                  rs_toggle_antenna(valid_tx_ant,
3016                                                    &new_rate, &tbl_type))
3017                                 ant_toggle_cnt = 1;
3018
3019                         repeat_rate = IWL_NUMBER_TRY;
3020                 } else {
3021                         repeat_rate = IWL_HT_NUMBER_TRY;
3022                 }
3023
3024                 /* Don't allow HT rates after next pass.
3025                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3026                 use_ht_possible = 0;
3027
3028                 /* Override next rate if needed for debug purposes */
3029                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3030
3031                 /* Fill next table entry */
3032                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3033
3034                 index++;
3035                 repeat_rate--;
3036         }
3037
3038         lq_cmd->agg_params.agg_frame_cnt_limit =
3039                 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3040         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3041
3042         lq_cmd->agg_params.agg_time_limit =
3043                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3044         /*
3045          * overwrite if needed, pass aggregation time limit
3046          * to uCode in uSec
3047          */
3048         if (priv && priv->cfg->bt_params &&
3049             priv->cfg->bt_params->agg_time_limit &&
3050             priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3051                 lq_cmd->agg_params.agg_time_limit =
3052                         cpu_to_le16(priv->cfg->bt_params->agg_time_limit);
3053 }
3054
3055 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3056 {
3057         return hw->priv;
3058 }
3059 /* rate scale requires free function to be implemented */
3060 static void rs_free(void *priv_rate)
3061 {
3062         return;
3063 }
3064
3065 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3066                         void *priv_sta)
3067 {
3068         struct iwl_priv *priv __maybe_unused = priv_r;
3069
3070         IWL_DEBUG_RATE(priv, "enter\n");
3071         IWL_DEBUG_RATE(priv, "leave\n");
3072 }
3073
3074 #ifdef CONFIG_MAC80211_DEBUGFS
3075 static int open_file_generic(struct inode *inode, struct file *file)
3076 {
3077         file->private_data = inode->i_private;
3078         return 0;
3079 }
3080 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3081                              u32 *rate_n_flags, int index)
3082 {
3083         struct iwl_priv *priv;
3084         u8 valid_tx_ant;
3085         u8 ant_sel_tx;
3086
3087         priv = lq_sta->drv;
3088         valid_tx_ant = priv->hw_params.valid_tx_ant;
3089         if (lq_sta->dbg_fixed_rate) {
3090                 ant_sel_tx =
3091                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3092                   >> RATE_MCS_ANT_POS);
3093                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3094                         *rate_n_flags = lq_sta->dbg_fixed_rate;
3095                         IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3096                 } else {
3097                         lq_sta->dbg_fixed_rate = 0;
3098                         priv->dbg_fixed_rate = 0;
3099                         IWL_ERR(priv,
3100                             "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3101                             ant_sel_tx, valid_tx_ant);
3102                         IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3103                 }
3104         } else {
3105                 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3106         }
3107 }
3108
3109 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3110                         const char __user *user_buf, size_t count, loff_t *ppos)
3111 {
3112         struct iwl_lq_sta *lq_sta = file->private_data;
3113         struct iwl_priv *priv;
3114         char buf[64];
3115         size_t buf_size;
3116         u32 parsed_rate;
3117
3118
3119         priv = lq_sta->drv;
3120         memset(buf, 0, sizeof(buf));
3121         buf_size = min(count, sizeof(buf) -  1);
3122         if (copy_from_user(buf, user_buf, buf_size))
3123                 return -EFAULT;
3124
3125         if (sscanf(buf, "%x", &parsed_rate) == 1)
3126                 priv->dbg_fixed_rate = lq_sta->dbg_fixed_rate = parsed_rate;
3127         else
3128                 priv->dbg_fixed_rate = lq_sta->dbg_fixed_rate = 0;
3129
3130         rs_program_fix_rate(priv, lq_sta);
3131
3132         return count;
3133 }
3134
3135 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3136                         char __user *user_buf, size_t count, loff_t *ppos)
3137 {
3138         char *buff;
3139         int desc = 0;
3140         int i = 0;
3141         int index = 0;
3142         ssize_t ret;
3143
3144         struct iwl_lq_sta *lq_sta = file->private_data;
3145         struct iwl_priv *priv;
3146         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3147
3148         priv = lq_sta->drv;
3149         buff = kmalloc(1024, GFP_KERNEL);
3150         if (!buff)
3151                 return -ENOMEM;
3152
3153         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3154         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3155                         lq_sta->total_failed, lq_sta->total_success,
3156                         lq_sta->active_legacy_rate);
3157         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3158                         priv->dbg_fixed_rate);
3159         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3160             (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
3161             (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
3162             (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
3163         desc += sprintf(buff+desc, "lq type %s\n",
3164            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3165         if (is_Ht(tbl->lq_type)) {
3166                 desc += sprintf(buff+desc, " %s",
3167                    (is_siso(tbl->lq_type)) ? "SISO" :
3168                    ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3169                    desc += sprintf(buff+desc, " %s",
3170                    (tbl->is_ht40) ? "40MHz" : "20MHz");
3171                    desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3172                    (lq_sta->is_green) ? "GF enabled" : "",
3173                    (lq_sta->is_agg) ? "AGG on" : "");
3174         }
3175         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3176                 lq_sta->last_rate_n_flags);
3177         desc += sprintf(buff+desc, "general:"
3178                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3179                 lq_sta->lq.general_params.flags,
3180                 lq_sta->lq.general_params.mimo_delimiter,
3181                 lq_sta->lq.general_params.single_stream_ant_msk,
3182                 lq_sta->lq.general_params.dual_stream_ant_msk);
3183
3184         desc += sprintf(buff+desc, "agg:"
3185                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3186                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3187                         lq_sta->lq.agg_params.agg_dis_start_th,
3188                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
3189
3190         desc += sprintf(buff+desc,
3191                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3192                         lq_sta->lq.general_params.start_rate_index[0],
3193                         lq_sta->lq.general_params.start_rate_index[1],
3194                         lq_sta->lq.general_params.start_rate_index[2],
3195                         lq_sta->lq.general_params.start_rate_index[3]);
3196
3197         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3198                 index = iwl_hwrate_to_plcp_idx(
3199                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3200                 if (is_legacy(tbl->lq_type)) {
3201                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3202                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3203                                 iwl_rate_mcs[index].mbps);
3204                 } else {
3205                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3206                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3207                                 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3208                 }
3209         }
3210
3211         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3212         kfree(buff);
3213         return ret;
3214 }
3215
3216 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3217         .write = rs_sta_dbgfs_scale_table_write,
3218         .read = rs_sta_dbgfs_scale_table_read,
3219         .open = open_file_generic,
3220         .llseek = default_llseek,
3221 };
3222 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3223                         char __user *user_buf, size_t count, loff_t *ppos)
3224 {
3225         char *buff;
3226         int desc = 0;
3227         int i, j;
3228         ssize_t ret;
3229
3230         struct iwl_lq_sta *lq_sta = file->private_data;
3231
3232         buff = kmalloc(1024, GFP_KERNEL);
3233         if (!buff)
3234                 return -ENOMEM;
3235
3236         for (i = 0; i < LQ_SIZE; i++) {
3237                 desc += sprintf(buff+desc,
3238                                 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3239                                 "rate=0x%X\n",
3240                                 lq_sta->active_tbl == i ? "*" : "x",
3241                                 lq_sta->lq_info[i].lq_type,
3242                                 lq_sta->lq_info[i].is_SGI,
3243                                 lq_sta->lq_info[i].is_ht40,
3244                                 lq_sta->lq_info[i].is_dup,
3245                                 lq_sta->is_green,
3246                                 lq_sta->lq_info[i].current_rate);
3247                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3248                         desc += sprintf(buff+desc,
3249                                 "counter=%d success=%d %%=%d\n",
3250                                 lq_sta->lq_info[i].win[j].counter,
3251                                 lq_sta->lq_info[i].win[j].success_counter,
3252                                 lq_sta->lq_info[i].win[j].success_ratio);
3253                 }
3254         }
3255         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3256         kfree(buff);
3257         return ret;
3258 }
3259
3260 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3261         .read = rs_sta_dbgfs_stats_table_read,
3262         .open = open_file_generic,
3263         .llseek = default_llseek,
3264 };
3265
3266 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3267                         char __user *user_buf, size_t count, loff_t *ppos)
3268 {
3269         struct iwl_lq_sta *lq_sta = file->private_data;
3270         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3271         char buff[120];
3272         int desc = 0;
3273
3274         if (is_Ht(tbl->lq_type))
3275                 desc += sprintf(buff+desc,
3276                                 "Bit Rate= %d Mb/s\n",
3277                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3278         else
3279                 desc += sprintf(buff+desc,
3280                                 "Bit Rate= %d Mb/s\n",
3281                                 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3282
3283         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3284 }
3285
3286 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3287         .read = rs_sta_dbgfs_rate_scale_data_read,
3288         .open = open_file_generic,
3289         .llseek = default_llseek,
3290 };
3291
3292 static void rs_add_debugfs(void *priv, void *priv_sta,
3293                                         struct dentry *dir)
3294 {
3295         struct iwl_lq_sta *lq_sta = priv_sta;
3296         lq_sta->rs_sta_dbgfs_scale_table_file =
3297                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3298                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3299         lq_sta->rs_sta_dbgfs_stats_table_file =
3300                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3301                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
3302         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3303                 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3304                         lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3305         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3306                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3307                 &lq_sta->tx_agg_tid_en);
3308
3309 }
3310
3311 static void rs_remove_debugfs(void *priv, void *priv_sta)
3312 {
3313         struct iwl_lq_sta *lq_sta = priv_sta;
3314         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3315         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3316         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3317         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3318 }
3319 #endif
3320
3321 /*
3322  * Initialization of rate scaling information is done by driver after
3323  * the station is added. Since mac80211 calls this function before a
3324  * station is added we ignore it.
3325  */
3326 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3327                          struct ieee80211_sta *sta, void *priv_sta)
3328 {
3329 }
3330 static struct rate_control_ops rs_ops = {
3331         .module = NULL,
3332         .name = RS_NAME,
3333         .tx_status = rs_tx_status,
3334         .get_rate = rs_get_rate,
3335         .rate_init = rs_rate_init_stub,
3336         .alloc = rs_alloc,
3337         .free = rs_free,
3338         .alloc_sta = rs_alloc_sta,
3339         .free_sta = rs_free_sta,
3340 #ifdef CONFIG_MAC80211_DEBUGFS
3341         .add_sta_debugfs = rs_add_debugfs,
3342         .remove_sta_debugfs = rs_remove_debugfs,
3343 #endif
3344 };
3345
3346 int iwlagn_rate_control_register(void)
3347 {
3348         return ieee80211_rate_control_register(&rs_ops);
3349 }
3350
3351 void iwlagn_rate_control_unregister(void)
3352 {
3353         ieee80211_rate_control_unregister(&rs_ops);
3354 }
3355