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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2014 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 <linuxwifi@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/skbuff.h>
  28 #include <linux/slab.h>
  29 #include <net/mac80211.h>
  30
  31 #include <linux/netdevice.h>
  32 #include <linux/etherdevice.h>
  33 #include <linux/delay.h>
  34
  35 #include <linux/workqueue.h>
  36
  37 #include "dev.h"
  38 #include "agn.h"
  39
  40 #define RS_NAME "iwl-agn-rs"
  41
  42 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  43 #define IWL_NUMBER_TRY      1
  44 #define IWL_HT_NUMBER_TRY   3
  45
  46 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  47 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  48 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  49
  50 /* max allowed rate miss before sync LQ cmd */
  51 #define IWL_MISSED_RATE_MAX             15
  52 /* max time to accum history 2 seconds */
  53 #define IWL_RATE_SCALE_FLUSH_INTVL   (3*HZ)
  54
  55 static u8 rs_ht_to_legacy[] = {
  56         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  57         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  58         IWL_RATE_6M_INDEX,
  59         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  60         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  61         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  62         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  63 };
  64
  65 static const u8 ant_toggle_lookup[] = {
  66         /*ANT_NONE -> */ ANT_NONE,
  67         /*ANT_A    -> */ ANT_B,
  68         /*ANT_B    -> */ ANT_C,
  69         /*ANT_AB   -> */ ANT_BC,
  70         /*ANT_C    -> */ ANT_A,
  71         /*ANT_AC   -> */ ANT_AB,
  72         /*ANT_BC   -> */ ANT_AC,
  73         /*ANT_ABC  -> */ ANT_ABC,
  74 };
  75
  76 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
  77         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
  78                                     IWL_RATE_SISO_##s##M_PLCP, \
  79                                     IWL_RATE_MIMO2_##s##M_PLCP,\
  80                                     IWL_RATE_MIMO3_##s##M_PLCP,\
  81                                     IWL_RATE_##r##M_IEEE,      \
  82                                     IWL_RATE_##ip##M_INDEX,    \
  83                                     IWL_RATE_##in##M_INDEX,    \
  84                                     IWL_RATE_##rp##M_INDEX,    \
  85                                     IWL_RATE_##rn##M_INDEX,    \
  86                                     IWL_RATE_##pp##M_INDEX,    \
  87                                     IWL_RATE_##np##M_INDEX }
  88
  89 /*
  90  * Parameter order:
  91  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
  92  *
  93  * If there isn't a valid next or previous rate then INV is used which
  94  * maps to IWL_RATE_INVALID
  95  *
  96  */
  97 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
  98         IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),    /*  1mbps */
  99         IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
 100         IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
 101         IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
 102         IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
 103         IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
 104         IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
 105         IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
 106         IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
 107         IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
 108         IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
 109         IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
 110         IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
 111         /* FIXME:RS:          ^^    should be INV (legacy) */
 112 };
 113
 114 static inline u8 rs_extract_rate(u32 rate_n_flags)
 115 {
 116         return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
 117 }
 118
 119 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 120 {
 121         int idx = 0;
 122
 123         /* HT rate format */
 124         if (rate_n_flags & RATE_MCS_HT_MSK) {
 125                 idx = rs_extract_rate(rate_n_flags);
 126
 127                 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
 128                         idx = idx - IWL_RATE_MIMO3_6M_PLCP;
 129                 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
 130                         idx = idx - IWL_RATE_MIMO2_6M_PLCP;
 131
 132                 idx += IWL_FIRST_OFDM_RATE;
 133                 /* skip 9M not supported in ht*/
 134                 if (idx >= IWL_RATE_9M_INDEX)
 135                         idx += 1;
 136                 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
 137                         return idx;
 138
 139         /* legacy rate format, search for match in table */
 140         } else {
 141                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 142                         if (iwl_rates[idx].plcp ==
 143                                         rs_extract_rate(rate_n_flags))
 144                                 return idx;
 145         }
 146
 147         return -1;
 148 }
 149
 150 static void rs_rate_scale_perform(struct iwl_priv *priv,
 151                                    struct sk_buff *skb,
 152                                    struct ieee80211_sta *sta,
 153                                    struct iwl_lq_sta *lq_sta);
 154 static void rs_fill_link_cmd(struct iwl_priv *priv,
 155                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 156 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 157
 158
 159 #ifdef CONFIG_MAC80211_DEBUGFS
 160 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 161                              u32 *rate_n_flags, int index);
 162 #else
 163 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 164                              u32 *rate_n_flags, int index)
 165 {}
 166 #endif
 167
 168 /**
 169  * The following tables contain the expected throughput metrics for all rates
 170  *
 171  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 172  *
 173  * where invalid entries are zeros.
 174  *
 175  * CCK rates are only valid in legacy table and will only be used in G
 176  * (2.4 GHz) band.
 177  */
 178
 179 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 180         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 181 };
 182
 183 static const u16 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
 184         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202}, /* Norm */
 185         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210}, /* SGI */
 186         {0, 0, 0, 0, 47, 0,  91, 133, 171, 242, 305, 334, 362}, /* AGG */
 187         {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
 188 };
 189
 190 static const u16 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
 191         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 192         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 193         {0, 0, 0, 0,  94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
 194         {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
 195 };
 196
 197 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 198         {0, 0, 0, 0,  74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
 199         {0, 0, 0, 0,  81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
 200         {0, 0, 0, 0,  89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
 201         {0, 0, 0, 0,  97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
 202 };
 203
 204 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 205         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
 206         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
 207         {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
 208         {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
 209 };
 210
 211 static const u16 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
 212         {0, 0, 0, 0,  99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
 213         {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
 214         {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
 215         {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
 216 };
 217
 218 static const u16 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
 219         {0, 0, 0, 0, 152, 0, 211, 239, 255, 279,  290,  294,  297}, /* Norm */
 220         {0, 0, 0, 0, 160, 0, 219, 245, 261, 284,  294,  297,  300}, /* SGI */
 221         {0, 0, 0, 0, 254, 0, 443, 584, 695, 868,  984, 1030, 1070}, /* AGG */
 222         {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
 223 };
 224
 225 /* mbps, mcs */
 226 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 227         {  "1", "BPSK DSSS"},
 228         {  "2", "QPSK DSSS"},
 229         {"5.5", "BPSK CCK"},
 230         { "11", "QPSK CCK"},
 231         {  "6", "BPSK 1/2"},
 232         {  "9", "BPSK 1/2"},
 233         { "12", "QPSK 1/2"},
 234         { "18", "QPSK 3/4"},
 235         { "24", "16QAM 1/2"},
 236         { "36", "16QAM 3/4"},
 237         { "48", "64QAM 2/3"},
 238         { "54", "64QAM 3/4"},
 239         { "60", "64QAM 5/6"},
 240 };
 241
 242 #define MCS_INDEX_PER_STREAM    (8)
 243
 244 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 245 {
 246         window->data = 0;
 247         window->success_counter = 0;
 248         window->success_ratio = IWL_INVALID_VALUE;
 249         window->counter = 0;
 250         window->average_tpt = IWL_INVALID_VALUE;
 251         window->stamp = 0;
 252 }
 253
 254 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 255 {
 256         return (ant_type & valid_antenna) == ant_type;
 257 }
 258
 259 /*
 260  *      removes the old data from the statistics. All data that is older than
 261  *      TID_MAX_TIME_DIFF, will be deleted.
 262  */
 263 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 264 {
 265         /* The oldest age we want to keep */
 266         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 267
 268         while (tl->queue_count &&
 269                (tl->time_stamp < oldest_time)) {
 270                 tl->total -= tl->packet_count[tl->head];
 271                 tl->packet_count[tl->head] = 0;
 272                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 273                 tl->queue_count--;
 274                 tl->head++;
 275                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 276                         tl->head = 0;
 277         }
 278 }
 279
 280 /*
 281  *      increment traffic load value for tid and also remove
 282  *      any old values if passed the certain time period
 283  */
 284 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 285                            struct ieee80211_hdr *hdr)
 286 {
 287         u32 curr_time = jiffies_to_msecs(jiffies);
 288         u32 time_diff;
 289         s32 index;
 290         struct iwl_traffic_load *tl = NULL;
 291         u8 tid;
 292
 293         if (ieee80211_is_data_qos(hdr->frame_control)) {
 294                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 295                 tid = qc[0] & 0xf;
 296         } else
 297                 return IWL_MAX_TID_COUNT;
 298
 299         if (unlikely(tid >= IWL_MAX_TID_COUNT))
 300                 return IWL_MAX_TID_COUNT;
 301
 302         tl = &lq_data->load[tid];
 303
 304         curr_time -= curr_time % TID_ROUND_VALUE;
 305
 306         /* Happens only for the first packet. Initialize the data */
 307         if (!(tl->queue_count)) {
 308                 tl->total = 1;
 309                 tl->time_stamp = curr_time;
 310                 tl->queue_count = 1;
 311                 tl->head = 0;
 312                 tl->packet_count[0] = 1;
 313                 return IWL_MAX_TID_COUNT;
 314         }
 315
 316         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 317         index = time_diff / TID_QUEUE_CELL_SPACING;
 318
 319         /* The history is too long: remove data that is older than */
 320         /* TID_MAX_TIME_DIFF */
 321         if (index >= TID_QUEUE_MAX_SIZE)
 322                 rs_tl_rm_old_stats(tl, curr_time);
 323
 324         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 325         tl->packet_count[index] = tl->packet_count[index] + 1;
 326         tl->total = tl->total + 1;
 327
 328         if ((index + 1) > tl->queue_count)
 329                 tl->queue_count = index + 1;
 330
 331         return tid;
 332 }
 333
 334 #ifdef CONFIG_MAC80211_DEBUGFS
 335 /**
 336  * Program the device to use fixed rate for frame transmit
 337  * This is for debugging/testing only
 338  * once the device start use fixed rate, we need to reload the module
 339  * to being back the normal operation.
 340  */
 341 static void rs_program_fix_rate(struct iwl_priv *priv,
 342                                 struct iwl_lq_sta *lq_sta)
 343 {
 344         struct iwl_station_priv *sta_priv =
 345                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
 346         struct iwl_rxon_context *ctx = sta_priv->ctx;
 347
 348         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
 349         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 350         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 351         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 352
 353         IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
 354                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
 355
 356         if (lq_sta->dbg_fixed_rate) {
 357                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->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 >= IWL_MAX_TID_COUNT)
 375                 return 0;
 376
 377         tl = &(lq_data->load[tid]);
 378
 379         curr_time -= curr_time % TID_ROUND_VALUE;
 380
 381         if (!(tl->queue_count))
 382                 return 0;
 383
 384         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 385         index = time_diff / TID_QUEUE_CELL_SPACING;
 386
 387         /* The history is too long: remove data that is older than */
 388         /* TID_MAX_TIME_DIFF */
 389         if (index >= TID_QUEUE_MAX_SIZE)
 390                 rs_tl_rm_old_stats(tl, curr_time);
 391
 392         return tl->total;
 393 }
 394
 395 static int rs_tl_turn_on_agg_for_tid(struct iwl_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_DEBUG_COEX(priv,
 408                                "BT traffic (%d), no aggregation allowed\n",
 409                                priv->bt_traffic_load);
 410                 return ret;
 411         }
 412
 413         load = rs_tl_get_load(lq_data, tid);
 414
 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         return ret;
 429 }
 430
 431 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 432                               struct iwl_lq_sta *lq_data,
 433                               struct ieee80211_sta *sta)
 434 {
 435         if (tid < IWL_MAX_TID_COUNT)
 436                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 437         else
 438                 IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n",
 439                         tid, IWL_MAX_TID_COUNT);
 440 }
 441
 442 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 443 {
 444         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 445                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 446                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 447 }
 448
 449 /*
 450  * Static function to get the expected throughput from an iwl_scale_tbl_info
 451  * that wraps a NULL pointer check
 452  */
 453 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 454 {
 455         if (tbl->expected_tpt)
 456                 return tbl->expected_tpt[rs_index];
 457         return 0;
 458 }
 459
 460 /**
 461  * rs_collect_tx_data - Update the success/failure sliding window
 462  *
 463  * We keep a sliding window of the last 62 packets transmitted
 464  * at this rate.  window->data contains the bitmask of successful
 465  * packets.
 466  */
 467 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 468                               int scale_index, int attempts, int successes)
 469 {
 470         struct iwl_rate_scale_data *window = NULL;
 471         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 472         s32 fail_count, tpt;
 473
 474         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 475                 return -EINVAL;
 476
 477         /* Select window for current tx bit rate */
 478         window = &(tbl->win[scale_index]);
 479
 480         /* Get expected throughput */
 481         tpt = get_expected_tpt(tbl, scale_index);
 482
 483         /*
 484          * Keep track of only the latest 62 tx frame attempts in this rate's
 485          * history window; anything older isn't really relevant any more.
 486          * If we have filled up the sliding window, drop the oldest attempt;
 487          * if the oldest attempt (highest bit in bitmap) shows "success",
 488          * subtract "1" from the success counter (this is the main reason
 489          * we keep these bitmaps!).
 490          */
 491         while (attempts > 0) {
 492                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 493
 494                         /* remove earliest */
 495                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 496
 497                         if (window->data & mask) {
 498                                 window->data &= ~mask;
 499                                 window->success_counter--;
 500                         }
 501                 }
 502
 503                 /* Increment frames-attempted counter */
 504                 window->counter++;
 505
 506                 /* Shift bitmap by one frame to throw away oldest history */
 507                 window->data <<= 1;
 508
 509                 /* Mark the most recent #successes attempts as successful */
 510                 if (successes > 0) {
 511                         window->success_counter++;
 512                         window->data |= 0x1;
 513                         successes--;
 514                 }
 515
 516                 attempts--;
 517         }
 518
 519         /* Calculate current success ratio, avoid divide-by-0! */
 520         if (window->counter > 0)
 521                 window->success_ratio = 128 * (100 * window->success_counter)
 522                                         / window->counter;
 523         else
 524                 window->success_ratio = IWL_INVALID_VALUE;
 525
 526         fail_count = window->counter - window->success_counter;
 527
 528         /* Calculate average throughput, if we have enough history. */
 529         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 530             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 531                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 532         else
 533                 window->average_tpt = IWL_INVALID_VALUE;
 534
 535         /* Tag this window as having been updated */
 536         window->stamp = jiffies;
 537
 538         return 0;
 539 }
 540
 541 /*
 542  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 543  */
 544 /* FIXME:RS:remove this function and put the flags statically in the table */
 545 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
 546                                  struct iwl_scale_tbl_info *tbl,
 547                                  int index, u8 use_green)
 548 {
 549         u32 rate_n_flags = 0;
 550
 551         if (is_legacy(tbl->lq_type)) {
 552                 rate_n_flags = iwl_rates[index].plcp;
 553                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 554                         rate_n_flags |= RATE_MCS_CCK_MSK;
 555
 556         } else if (is_Ht(tbl->lq_type)) {
 557                 if (index > IWL_LAST_OFDM_RATE) {
 558                         IWL_ERR(priv, "Invalid HT rate index %d\n", index);
 559                         index = IWL_LAST_OFDM_RATE;
 560                 }
 561                 rate_n_flags = RATE_MCS_HT_MSK;
 562
 563                 if (is_siso(tbl->lq_type))
 564                         rate_n_flags |= iwl_rates[index].plcp_siso;
 565                 else if (is_mimo2(tbl->lq_type))
 566                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 567                 else
 568                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 569         } else {
 570                 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 571         }
 572
 573         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 574                                                      RATE_MCS_ANT_ABC_MSK);
 575
 576         if (is_Ht(tbl->lq_type)) {
 577                 if (tbl->is_ht40) {
 578                         if (tbl->is_dup)
 579                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 580                         else
 581                                 rate_n_flags |= RATE_MCS_HT40_MSK;
 582                 }
 583                 if (tbl->is_SGI)
 584                         rate_n_flags |= RATE_MCS_SGI_MSK;
 585
 586                 if (use_green) {
 587                         rate_n_flags |= RATE_MCS_GF_MSK;
 588                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 589                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 590                                 IWL_ERR(priv, "GF was set with SGI:SISO\n");
 591                         }
 592                 }
 593         }
 594         return rate_n_flags;
 595 }
 596
 597 /*
 598  * Interpret uCode API's rate_n_flags format,
 599  * fill "search" or "active" tx mode table.
 600  */
 601 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 602                                     enum nl80211_band band,
 603                                     struct iwl_scale_tbl_info *tbl,
 604                                     int *rate_idx)
 605 {
 606         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 607         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 608         u8 mcs;
 609
 610         memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
 611         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 612
 613         if (*rate_idx  == IWL_RATE_INVALID) {
 614                 *rate_idx = -1;
 615                 return -EINVAL;
 616         }
 617         tbl->is_SGI = 0;        /* default legacy setup */
 618         tbl->is_ht40 = 0;
 619         tbl->is_dup = 0;
 620         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 621         tbl->lq_type = LQ_NONE;
 622         tbl->max_search = IWL_MAX_SEARCH;
 623
 624         /* legacy rate format */
 625         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 626                 if (num_of_ant == 1) {
 627                         if (band == NL80211_BAND_5GHZ)
 628                                 tbl->lq_type = LQ_A;
 629                         else
 630                                 tbl->lq_type = LQ_G;
 631                 }
 632         /* HT rate format */
 633         } else {
 634                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 635                         tbl->is_SGI = 1;
 636
 637                 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
 638                     (rate_n_flags & RATE_MCS_DUP_MSK))
 639                         tbl->is_ht40 = 1;
 640
 641                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 642                         tbl->is_dup = 1;
 643
 644                 mcs = rs_extract_rate(rate_n_flags);
 645
 646                 /* SISO */
 647                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 648                         if (num_of_ant == 1)
 649                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 650                 /* MIMO2 */
 651                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 652                         if (num_of_ant == 2)
 653                                 tbl->lq_type = LQ_MIMO2;
 654                 /* MIMO3 */
 655                 } else {
 656                         if (num_of_ant == 3) {
 657                                 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
 658                                 tbl->lq_type = LQ_MIMO3;
 659                         }
 660                 }
 661         }
 662         return 0;
 663 }
 664
 665 /* switch to another antenna/antennas and return 1 */
 666 /* if no other valid antenna found, return 0 */
 667 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 668                              struct iwl_scale_tbl_info *tbl)
 669 {
 670         u8 new_ant_type;
 671
 672         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 673                 return 0;
 674
 675         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 676                 return 0;
 677
 678         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 679
 680         while ((new_ant_type != tbl->ant_type) &&
 681                !rs_is_valid_ant(valid_ant, new_ant_type))
 682                 new_ant_type = ant_toggle_lookup[new_ant_type];
 683
 684         if (new_ant_type == tbl->ant_type)
 685                 return 0;
 686
 687         tbl->ant_type = new_ant_type;
 688         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 689         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 690         return 1;
 691 }
 692
 693 /**
 694  * Green-field mode is valid if the station supports it and
 695  * there are no non-GF stations present in the BSS.
 696  */
 697 static bool rs_use_green(struct ieee80211_sta *sta)
 698 {
 699         /*
 700          * There's a bug somewhere in this code that causes the
 701          * scaling to get stuck because GF+SGI can't be combined
 702          * in SISO rates. Until we find that bug, disable GF, it
 703          * has only limited benefit and we still interoperate with
 704          * GF APs since we can always receive GF transmissions.
 705          */
 706         return false;
 707 }
 708
 709 /**
 710  * rs_get_supported_rates - get the available rates
 711  *
 712  * if management frame or broadcast frame only return
 713  * basic available rates.
 714  *
 715  */
 716 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 717                                   struct ieee80211_hdr *hdr,
 718                                   enum iwl_table_type rate_type)
 719 {
 720         if (is_legacy(rate_type)) {
 721                 return lq_sta->active_legacy_rate;
 722         } else {
 723                 if (is_siso(rate_type))
 724                         return lq_sta->active_siso_rate;
 725                 else if (is_mimo2(rate_type))
 726                         return lq_sta->active_mimo2_rate;
 727                 else
 728                         return lq_sta->active_mimo3_rate;
 729         }
 730 }
 731
 732 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 733                                 int rate_type)
 734 {
 735         u8 high = IWL_RATE_INVALID;
 736         u8 low = IWL_RATE_INVALID;
 737
 738         /* 802.11A or ht walks to the next literal adjacent rate in
 739          * the rate table */
 740         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 741                 int i;
 742                 u32 mask;
 743
 744                 /* Find the previous rate that is in the rate mask */
 745                 i = index - 1;
 746                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 747                         if (rate_mask & mask) {
 748                                 low = i;
 749                                 break;
 750                         }
 751                 }
 752
 753                 /* Find the next rate that is in the rate mask */
 754                 i = index + 1;
 755                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 756                         if (rate_mask & mask) {
 757                                 high = i;
 758                                 break;
 759                         }
 760                 }
 761
 762                 return (high << 8) | low;
 763         }
 764
 765         low = index;
 766         while (low != IWL_RATE_INVALID) {
 767                 low = iwl_rates[low].prev_rs;
 768                 if (low == IWL_RATE_INVALID)
 769                         break;
 770                 if (rate_mask & (1 << low))
 771                         break;
 772                 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
 773         }
 774
 775         high = index;
 776         while (high != IWL_RATE_INVALID) {
 777                 high = iwl_rates[high].next_rs;
 778                 if (high == IWL_RATE_INVALID)
 779                         break;
 780                 if (rate_mask & (1 << high))
 781                         break;
 782                 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
 783         }
 784
 785         return (high << 8) | low;
 786 }
 787
 788 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 789                              struct iwl_scale_tbl_info *tbl,
 790                              u8 scale_index, u8 ht_possible)
 791 {
 792         s32 low;
 793         u16 rate_mask;
 794         u16 high_low;
 795         u8 switch_to_legacy = 0;
 796         u8 is_green = lq_sta->is_green;
 797         struct iwl_priv *priv = lq_sta->drv;
 798
 799         /* check if we need to switch from HT to legacy rates.
 800          * assumption is that mandatory rates (1Mbps or 6Mbps)
 801          * are always supported (spec demand) */
 802         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 803                 switch_to_legacy = 1;
 804                 scale_index = rs_ht_to_legacy[scale_index];
 805                 if (lq_sta->band == NL80211_BAND_5GHZ)
 806                         tbl->lq_type = LQ_A;
 807                 else
 808                         tbl->lq_type = LQ_G;
 809
 810                 if (num_of_ant(tbl->ant_type) > 1)
 811                         tbl->ant_type =
 812                             first_antenna(priv->nvm_data->valid_tx_ant);
 813
 814                 tbl->is_ht40 = 0;
 815                 tbl->is_SGI = 0;
 816                 tbl->max_search = IWL_MAX_SEARCH;
 817         }
 818
 819         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 820
 821         /* Mask with station rate restriction */
 822         if (is_legacy(tbl->lq_type)) {
 823                 /* supp_rates has no CCK bits in A mode */
 824                 if (lq_sta->band == NL80211_BAND_5GHZ)
 825                         rate_mask  = (u16)(rate_mask &
 826                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 827                 else
 828                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 829         }
 830
 831         /* If we switched from HT to legacy, check current rate */
 832         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 833                 low = scale_index;
 834                 goto out;
 835         }
 836
 837         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 838                                         tbl->lq_type);
 839         low = high_low & 0xff;
 840
 841         if (low == IWL_RATE_INVALID)
 842                 low = scale_index;
 843
 844 out:
 845         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 846 }
 847
 848 /*
 849  * Simple function to compare two rate scale table types
 850  */
 851 static bool table_type_matches(struct iwl_scale_tbl_info *a,
 852                                struct iwl_scale_tbl_info *b)
 853 {
 854         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 855                 (a->is_SGI == b->is_SGI);
 856 }
 857
 858 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 859                             struct iwl_lq_sta *lq_sta)
 860 {
 861         struct iwl_scale_tbl_info *tbl;
 862         bool full_concurrent = priv->bt_full_concurrent;
 863
 864         if (priv->bt_ant_couple_ok) {
 865                 /*
 866                  * Is there a need to switch between
 867                  * full concurrency and 3-wire?
 868                  */
 869                 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
 870                         full_concurrent = true;
 871                 else
 872                         full_concurrent = false;
 873         }
 874         if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
 875             (priv->bt_full_concurrent != full_concurrent)) {
 876                 priv->bt_full_concurrent = full_concurrent;
 877                 priv->last_bt_traffic_load = priv->bt_traffic_load;
 878
 879                 /* Update uCode's rate table. */
 880                 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 881                 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
 882                 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 883
 884                 queue_work(priv->workqueue, &priv->bt_full_concurrency);
 885         }
 886 }
 887
 888 /*
 889  * mac80211 sends us Tx status
 890  */
 891 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 892                          struct ieee80211_sta *sta, void *priv_sta,
 893                          struct sk_buff *skb)
 894 {
 895         int legacy_success;
 896         int retries;
 897         int rs_index, mac_index, i;
 898         struct iwl_lq_sta *lq_sta = priv_sta;
 899         struct iwl_link_quality_cmd *table;
 900         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 901         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r;
 902         struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
 903         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 904         enum mac80211_rate_control_flags mac_flags;
 905         u32 tx_rate;
 906         struct iwl_scale_tbl_info tbl_type;
 907         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 908         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 909         struct iwl_rxon_context *ctx = sta_priv->ctx;
 910
 911         IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
 912
 913         /* Treat uninitialized rate scaling data same as non-existing. */
 914         if (!lq_sta) {
 915                 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
 916                 return;
 917         } else if (!lq_sta->drv) {
 918                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
 919                 return;
 920         }
 921
 922         if (!ieee80211_is_data(hdr->frame_control) ||
 923             info->flags & IEEE80211_TX_CTL_NO_ACK)
 924                 return;
 925
 926         /* This packet was aggregated but doesn't carry status info */
 927         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 928             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 929                 return;
 930
 931         /*
 932          * Ignore this Tx frame response if its initial rate doesn't match
 933          * that of latest Link Quality command.  There may be stragglers
 934          * from a previous Link Quality command, but we're no longer interested
 935          * in those; they're either from the "active" mode while we're trying
 936          * to check "search" mode, or a prior "search" mode after we've moved
 937          * to a new "search" mode (which might become the new "active" mode).
 938          */
 939         table = &lq_sta->lq;
 940         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 941         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 942         if (priv->band == NL80211_BAND_5GHZ)
 943                 rs_index -= IWL_FIRST_OFDM_RATE;
 944         mac_flags = info->status.rates[0].flags;
 945         mac_index = info->status.rates[0].idx;
 946         /* For HT packets, map MCS to PLCP */
 947         if (mac_flags & IEEE80211_TX_RC_MCS) {
 948                 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
 949                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 950                         mac_index++;
 951                 /*
 952                  * mac80211 HT index is always zero-indexed; we need to move
 953                  * HT OFDM rates after CCK rates in 2.4 GHz band
 954                  */
 955                 if (priv->band == NL80211_BAND_2GHZ)
 956                         mac_index += IWL_FIRST_OFDM_RATE;
 957         }
 958         /* Here we actually compare this rate to the latest LQ command */
 959         if ((mac_index < 0) ||
 960             (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 961             (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 962             (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
 963             (tbl_type.ant_type != info->status.antenna) ||
 964             (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 965             (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 966             (rs_index != mac_index)) {
 967                 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
 968                 /*
 969                  * Since rates mis-match, the last LQ command may have failed.
 970                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 971                  * ... driver.
 972                  */
 973                 lq_sta->missed_rate_counter++;
 974                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 975                         lq_sta->missed_rate_counter = 0;
 976                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 977                 }
 978                 /* Regardless, ignore this status info for outdated rate */
 979                 return;
 980         } else
 981                 /* Rate did match, so reset the missed_rate_counter */
 982                 lq_sta->missed_rate_counter = 0;
 983
 984         /* Figure out if rate scale algorithm is in active or search table */
 985         if (table_type_matches(&tbl_type,
 986                                 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 987                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 988                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 989         } else if (table_type_matches(&tbl_type,
 990                                 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
 991                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 992                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 993         } else {
 994                 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
 995                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 996                 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
 997                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
 998                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 999                 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1000                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1001                 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1002                         tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1003                 /*
1004                  * no matching table found, let's by-pass the data collection
1005                  * and continue to perform rate scale to find the rate table
1006                  */
1007                 rs_stay_in_table(lq_sta, true);
1008                 goto done;
1009         }
1010
1011         /*
1012          * Updating the frame history depends on whether packets were
1013          * aggregated.
1014          *
1015          * For aggregation, all packets were transmitted at the same rate, the
1016          * first index into rate scale table.
1017          */
1018         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1019                 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1020                 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1021                                 &rs_index);
1022                 rs_collect_tx_data(curr_tbl, rs_index,
1023                                    info->status.ampdu_len,
1024                                    info->status.ampdu_ack_len);
1025
1026                 /* Update success/fail counts if not searching for new mode */
1027                 if (lq_sta->stay_in_tbl) {
1028                         lq_sta->total_success += info->status.ampdu_ack_len;
1029                         lq_sta->total_failed += (info->status.ampdu_len -
1030                                         info->status.ampdu_ack_len);
1031                 }
1032         } else {
1033         /*
1034          * For legacy, update frame history with for each Tx retry.
1035          */
1036                 retries = info->status.rates[0].count - 1;
1037                 /* HW doesn't send more than 15 retries */
1038                 retries = min(retries, 15);
1039
1040                 /* The last transmission may have been successful */
1041                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1042                 /* Collect data for each rate used during failed TX attempts */
1043                 for (i = 0; i <= retries; ++i) {
1044                         tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1045                         rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1046                                         &tbl_type, &rs_index);
1047                         /*
1048                          * Only collect stats if retried rate is in the same RS
1049                          * table as active/search.
1050                          */
1051                         if (table_type_matches(&tbl_type, curr_tbl))
1052                                 tmp_tbl = curr_tbl;
1053                         else if (table_type_matches(&tbl_type, other_tbl))
1054                                 tmp_tbl = other_tbl;
1055                         else
1056                                 continue;
1057                         rs_collect_tx_data(tmp_tbl, rs_index, 1,
1058                                            i < retries ? 0 : legacy_success);
1059                 }
1060
1061                 /* Update success/fail counts if not searching for new mode */
1062                 if (lq_sta->stay_in_tbl) {
1063                         lq_sta->total_success += legacy_success;
1064                         lq_sta->total_failed += retries + (1 - legacy_success);
1065                 }
1066         }
1067         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1068         lq_sta->last_rate_n_flags = tx_rate;
1069 done:
1070         /* See if there's a better rate or modulation mode to try. */
1071         if (sta && sta->supp_rates[sband->band])
1072                 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1073
1074         if (priv->lib->bt_params && priv->lib->bt_params->advanced_bt_coexist)
1075                 rs_bt_update_lq(priv, ctx, lq_sta);
1076 }
1077
1078 /*
1079  * Begin a period of staying with a selected modulation mode.
1080  * Set "stay_in_tbl" flag to prevent any mode switches.
1081  * Set frame tx success limits according to legacy vs. high-throughput,
1082  * and reset overall (spanning all rates) tx success history statistics.
1083  * These control how long we stay using same modulation mode before
1084  * searching for a new mode.
1085  */
1086 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1087                                  struct iwl_lq_sta *lq_sta)
1088 {
1089         IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1090         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1091         if (is_legacy) {
1092                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1093                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1094                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1095         } else {
1096                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1097                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1098                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1099         }
1100         lq_sta->table_count = 0;
1101         lq_sta->total_failed = 0;
1102         lq_sta->total_success = 0;
1103         lq_sta->flush_timer = jiffies;
1104         lq_sta->action_counter = 0;
1105 }
1106
1107 /*
1108  * Find correct throughput table for given mode of modulation
1109  */
1110 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1111                                       struct iwl_scale_tbl_info *tbl)
1112 {
1113         /* Used to choose among HT tables */
1114         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1115
1116         /* Check for invalid LQ type */
1117         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1118                 tbl->expected_tpt = expected_tpt_legacy;
1119                 return;
1120         }
1121
1122         /* Legacy rates have only one table */
1123         if (is_legacy(tbl->lq_type)) {
1124                 tbl->expected_tpt = expected_tpt_legacy;
1125                 return;
1126         }
1127
1128         /* Choose among many HT tables depending on number of streams
1129          * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1130          * status */
1131         if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1132                 ht_tbl_pointer = expected_tpt_siso20MHz;
1133         else if (is_siso(tbl->lq_type))
1134                 ht_tbl_pointer = expected_tpt_siso40MHz;
1135         else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1136                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1137         else if (is_mimo2(tbl->lq_type))
1138                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1139         else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1140                 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1141         else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1142                 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1143
1144         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
1145                 tbl->expected_tpt = ht_tbl_pointer[0];
1146         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1147                 tbl->expected_tpt = ht_tbl_pointer[1];
1148         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1149                 tbl->expected_tpt = ht_tbl_pointer[2];
1150         else                                            /* AGG+SGI */
1151                 tbl->expected_tpt = ht_tbl_pointer[3];
1152 }
1153
1154 /*
1155  * Find starting rate for new "search" high-throughput mode of modulation.
1156  * Goal is to find lowest expected rate (under perfect conditions) that is
1157  * above the current measured throughput of "active" mode, to give new mode
1158  * a fair chance to prove itself without too many challenges.
1159  *
1160  * This gets called when transitioning to more aggressive modulation
1161  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1162  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1163  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1164  * bit rate will typically need to increase, but not if performance was bad.
1165  */
1166 static s32 rs_get_best_rate(struct iwl_priv *priv,
1167                             struct iwl_lq_sta *lq_sta,
1168                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1169                             u16 rate_mask, s8 index)
1170 {
1171         /* "active" values */
1172         struct iwl_scale_tbl_info *active_tbl =
1173             &(lq_sta->lq_info[lq_sta->active_tbl]);
1174         s32 active_sr = active_tbl->win[index].success_ratio;
1175         s32 active_tpt = active_tbl->expected_tpt[index];
1176         /* expected "search" throughput */
1177         const u16 *tpt_tbl = tbl->expected_tpt;
1178
1179         s32 new_rate, high, low, start_hi;
1180         u16 high_low;
1181         s8 rate = index;
1182
1183         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1184
1185         for (; ;) {
1186                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1187                                                 tbl->lq_type);
1188
1189                 low = high_low & 0xff;
1190                 high = (high_low >> 8) & 0xff;
1191
1192                 /*
1193                  * Lower the "search" bit rate, to give new "search" mode
1194                  * approximately the same throughput as "active" if:
1195                  *
1196                  * 1) "Active" mode has been working modestly well (but not
1197                  *    great), and expected "search" throughput (under perfect
1198                  *    conditions) at candidate rate is above the actual
1199                  *    measured "active" throughput (but less than expected
1200                  *    "active" throughput under perfect conditions).
1201                  * OR
1202                  * 2) "Active" mode has been working perfectly or very well
1203                  *    and expected "search" throughput (under perfect
1204                  *    conditions) at candidate rate is above expected
1205                  *    "active" throughput (under perfect conditions).
1206                  */
1207                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1208                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1209                       (active_sr <= IWL_RATE_HIGH_TH) &&
1210                       (tpt_tbl[rate] <= active_tpt))) ||
1211                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1212                      (tpt_tbl[rate] > active_tpt))) {
1213
1214                         /* (2nd or later pass)
1215                          * If we've already tried to raise the rate, and are
1216                          * now trying to lower it, use the higher rate. */
1217                         if (start_hi != IWL_RATE_INVALID) {
1218                                 new_rate = start_hi;
1219                                 break;
1220                         }
1221
1222                         new_rate = rate;
1223
1224                         /* Loop again with lower rate */
1225                         if (low != IWL_RATE_INVALID)
1226                                 rate = low;
1227
1228                         /* Lower rate not available, use the original */
1229                         else
1230                                 break;
1231
1232                 /* Else try to raise the "search" rate to match "active" */
1233                 } else {
1234                         /* (2nd or later pass)
1235                          * If we've already tried to lower the rate, and are
1236                          * now trying to raise it, use the lower rate. */
1237                         if (new_rate != IWL_RATE_INVALID)
1238                                 break;
1239
1240                         /* Loop again with higher rate */
1241                         else if (high != IWL_RATE_INVALID) {
1242                                 start_hi = high;
1243                                 rate = high;
1244
1245                         /* Higher rate not available, use the original */
1246                         } else {
1247                                 new_rate = rate;
1248                                 break;
1249                         }
1250                 }
1251         }
1252
1253         return new_rate;
1254 }
1255
1256 /*
1257  * Set up search table for MIMO2
1258  */
1259 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1260                              struct iwl_lq_sta *lq_sta,
1261                              struct ieee80211_conf *conf,
1262                              struct ieee80211_sta *sta,
1263                              struct iwl_scale_tbl_info *tbl, int index)
1264 {
1265         u16 rate_mask;
1266         s32 rate;
1267         s8 is_green = lq_sta->is_green;
1268         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1269         struct iwl_rxon_context *ctx = sta_priv->ctx;
1270
1271         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1272                 return -1;
1273
1274         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1275                 return -1;
1276
1277         /* Need both Tx chains/antennas to support MIMO */
1278         if (priv->hw_params.tx_chains_num < 2)
1279                 return -1;
1280
1281         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1282
1283         tbl->lq_type = LQ_MIMO2;
1284         tbl->is_dup = lq_sta->is_dup;
1285         tbl->action = 0;
1286         tbl->max_search = IWL_MAX_SEARCH;
1287         rate_mask = lq_sta->active_mimo2_rate;
1288
1289         if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1290                 tbl->is_ht40 = 1;
1291         else
1292                 tbl->is_ht40 = 0;
1293
1294         rs_set_expected_tpt_table(lq_sta, tbl);
1295
1296         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1297
1298         IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1299         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1300                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1301                                                 rate, rate_mask);
1302                 return -1;
1303         }
1304         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1305
1306         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1307                      tbl->current_rate, is_green);
1308         return 0;
1309 }
1310
1311 /*
1312  * Set up search table for MIMO3
1313  */
1314 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1315                              struct iwl_lq_sta *lq_sta,
1316                              struct ieee80211_conf *conf,
1317                              struct ieee80211_sta *sta,
1318                              struct iwl_scale_tbl_info *tbl, int index)
1319 {
1320         u16 rate_mask;
1321         s32 rate;
1322         s8 is_green = lq_sta->is_green;
1323         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1324         struct iwl_rxon_context *ctx = sta_priv->ctx;
1325
1326         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1327                 return -1;
1328
1329         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1330                 return -1;
1331
1332         /* Need both Tx chains/antennas to support MIMO */
1333         if (priv->hw_params.tx_chains_num < 3)
1334                 return -1;
1335
1336         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1337
1338         tbl->lq_type = LQ_MIMO3;
1339         tbl->is_dup = lq_sta->is_dup;
1340         tbl->action = 0;
1341         tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1342         rate_mask = lq_sta->active_mimo3_rate;
1343
1344         if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1345                 tbl->is_ht40 = 1;
1346         else
1347                 tbl->is_ht40 = 0;
1348
1349         rs_set_expected_tpt_table(lq_sta, tbl);
1350
1351         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1352
1353         IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1354                 rate, rate_mask);
1355         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1356                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1357                                                 rate, rate_mask);
1358                 return -1;
1359         }
1360         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1361
1362         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1363                      tbl->current_rate, is_green);
1364         return 0;
1365 }
1366
1367 /*
1368  * Set up search table for SISO
1369  */
1370 static int rs_switch_to_siso(struct iwl_priv *priv,
1371                              struct iwl_lq_sta *lq_sta,
1372                              struct ieee80211_conf *conf,
1373                              struct ieee80211_sta *sta,
1374                              struct iwl_scale_tbl_info *tbl, int index)
1375 {
1376         u16 rate_mask;
1377         u8 is_green = lq_sta->is_green;
1378         s32 rate;
1379         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1380         struct iwl_rxon_context *ctx = sta_priv->ctx;
1381
1382         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1383                 return -1;
1384
1385         IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1386
1387         tbl->is_dup = lq_sta->is_dup;
1388         tbl->lq_type = LQ_SISO;
1389         tbl->action = 0;
1390         tbl->max_search = IWL_MAX_SEARCH;
1391         rate_mask = lq_sta->active_siso_rate;
1392
1393         if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1394                 tbl->is_ht40 = 1;
1395         else
1396                 tbl->is_ht40 = 0;
1397
1398         if (is_green)
1399                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1400
1401         rs_set_expected_tpt_table(lq_sta, tbl);
1402         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1403
1404         IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1405         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1406                 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1407                              rate, rate_mask);
1408                 return -1;
1409         }
1410         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1411         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1412                      tbl->current_rate, is_green);
1413         return 0;
1414 }
1415
1416 /*
1417  * Try to switch to new modulation mode from legacy
1418  */
1419 static void rs_move_legacy_other(struct iwl_priv *priv,
1420                                  struct iwl_lq_sta *lq_sta,
1421                                  struct ieee80211_conf *conf,
1422                                  struct ieee80211_sta *sta,
1423                                  int index)
1424 {
1425         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1426         struct iwl_scale_tbl_info *search_tbl =
1427                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1428         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1429         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1430                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1431         u8 start_action;
1432         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1433         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1434         int ret = 0;
1435         u8 update_search_tbl_counter = 0;
1436
1437         switch (priv->bt_traffic_load) {
1438         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1439                 /* nothing */
1440                 break;
1441         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1442                 /* avoid antenna B unless MIMO */
1443                 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1444                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1445                 break;
1446         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1447         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1448                 /* avoid antenna B and MIMO */
1449                 valid_tx_ant =
1450                         first_antenna(priv->nvm_data->valid_tx_ant);
1451                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1452                     tbl->action != IWL_LEGACY_SWITCH_SISO)
1453                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1454                 break;
1455         default:
1456                 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1457                 break;
1458         }
1459
1460         if (!iwl_ht_enabled(priv))
1461                 /* stay in Legacy */
1462                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1463         else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1464                    tbl->action > IWL_LEGACY_SWITCH_SISO)
1465                 tbl->action = IWL_LEGACY_SWITCH_SISO;
1466
1467         /* configure as 1x1 if bt full concurrency */
1468         if (priv->bt_full_concurrent) {
1469                 if (!iwl_ht_enabled(priv))
1470                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1471                 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1472                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1473                 valid_tx_ant =
1474                         first_antenna(priv->nvm_data->valid_tx_ant);
1475         }
1476
1477         start_action = tbl->action;
1478         for (; ;) {
1479                 lq_sta->action_counter++;
1480                 switch (tbl->action) {
1481                 case IWL_LEGACY_SWITCH_ANTENNA1:
1482                 case IWL_LEGACY_SWITCH_ANTENNA2:
1483                         IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1484
1485                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1486                                                         tx_chains_num <= 1) ||
1487                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1488                                                         tx_chains_num <= 2))
1489                                 break;
1490
1491                         /* Don't change antenna if success has been great */
1492                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1493                             !priv->bt_full_concurrent &&
1494                             priv->bt_traffic_load ==
1495                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1496                                 break;
1497
1498                         /* Set up search table to try other antenna */
1499                         memcpy(search_tbl, tbl, sz);
1500
1501                         if (rs_toggle_antenna(valid_tx_ant,
1502                                 &search_tbl->current_rate, search_tbl)) {
1503                                 update_search_tbl_counter = 1;
1504                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1505                                 goto out;
1506                         }
1507                         break;
1508                 case IWL_LEGACY_SWITCH_SISO:
1509                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1510
1511                         /* Set up search table to try SISO */
1512                         memcpy(search_tbl, tbl, sz);
1513                         search_tbl->is_SGI = 0;
1514                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1515                                                  search_tbl, index);
1516                         if (!ret) {
1517                                 lq_sta->action_counter = 0;
1518                                 goto out;
1519                         }
1520
1521                         break;
1522                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1523                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1524                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1525                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1526
1527                         /* Set up search table to try MIMO */
1528                         memcpy(search_tbl, tbl, sz);
1529                         search_tbl->is_SGI = 0;
1530
1531                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1532                                 search_tbl->ant_type = ANT_AB;
1533                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1534                                 search_tbl->ant_type = ANT_AC;
1535                         else
1536                                 search_tbl->ant_type = ANT_BC;
1537
1538                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1539                                 break;
1540
1541                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1542                                                  search_tbl, index);
1543                         if (!ret) {
1544                                 lq_sta->action_counter = 0;
1545                                 goto out;
1546                         }
1547                         break;
1548
1549                 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1550                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1551
1552                         /* Set up search table to try MIMO3 */
1553                         memcpy(search_tbl, tbl, sz);
1554                         search_tbl->is_SGI = 0;
1555
1556                         search_tbl->ant_type = ANT_ABC;
1557
1558                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1559                                 break;
1560
1561                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1562                                                  search_tbl, index);
1563                         if (!ret) {
1564                                 lq_sta->action_counter = 0;
1565                                 goto out;
1566                         }
1567                         break;
1568                 }
1569                 tbl->action++;
1570                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1571                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1572
1573                 if (tbl->action == start_action)
1574                         break;
1575
1576         }
1577         search_tbl->lq_type = LQ_NONE;
1578         return;
1579
1580 out:
1581         lq_sta->search_better_tbl = 1;
1582         tbl->action++;
1583         if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1584                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1585         if (update_search_tbl_counter)
1586                 search_tbl->action = tbl->action;
1587 }
1588
1589 /*
1590  * Try to switch to new modulation mode from SISO
1591  */
1592 static void rs_move_siso_to_other(struct iwl_priv *priv,
1593                                   struct iwl_lq_sta *lq_sta,
1594                                   struct ieee80211_conf *conf,
1595                                   struct ieee80211_sta *sta, int index)
1596 {
1597         u8 is_green = lq_sta->is_green;
1598         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1599         struct iwl_scale_tbl_info *search_tbl =
1600                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1601         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1602         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1603         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1604                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1605         u8 start_action;
1606         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1607         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1608         u8 update_search_tbl_counter = 0;
1609         int ret;
1610
1611         switch (priv->bt_traffic_load) {
1612         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1613                 /* nothing */
1614                 break;
1615         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1616                 /* avoid antenna B unless MIMO */
1617                 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1618                         tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1619                 break;
1620         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1621         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1622                 /* avoid antenna B and MIMO */
1623                 valid_tx_ant =
1624                         first_antenna(priv->nvm_data->valid_tx_ant);
1625                 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1626                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1627                 break;
1628         default:
1629                 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1630                 break;
1631         }
1632
1633         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1634             tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1635                 /* stay in SISO */
1636                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1637         }
1638
1639         /* configure as 1x1 if bt full concurrency */
1640         if (priv->bt_full_concurrent) {
1641                 valid_tx_ant =
1642                         first_antenna(priv->nvm_data->valid_tx_ant);
1643                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1644                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1645         }
1646
1647         start_action = tbl->action;
1648         for (;;) {
1649                 lq_sta->action_counter++;
1650                 switch (tbl->action) {
1651                 case IWL_SISO_SWITCH_ANTENNA1:
1652                 case IWL_SISO_SWITCH_ANTENNA2:
1653                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1654                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1655                                                 tx_chains_num <= 1) ||
1656                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1657                                                 tx_chains_num <= 2))
1658                                 break;
1659
1660                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1661                             !priv->bt_full_concurrent &&
1662                             priv->bt_traffic_load ==
1663                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1664                                 break;
1665
1666                         memcpy(search_tbl, tbl, sz);
1667                         if (rs_toggle_antenna(valid_tx_ant,
1668                                        &search_tbl->current_rate, search_tbl)) {
1669                                 update_search_tbl_counter = 1;
1670                                 goto out;
1671                         }
1672                         break;
1673                 case IWL_SISO_SWITCH_MIMO2_AB:
1674                 case IWL_SISO_SWITCH_MIMO2_AC:
1675                 case IWL_SISO_SWITCH_MIMO2_BC:
1676                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1677                         memcpy(search_tbl, tbl, sz);
1678                         search_tbl->is_SGI = 0;
1679
1680                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1681                                 search_tbl->ant_type = ANT_AB;
1682                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1683                                 search_tbl->ant_type = ANT_AC;
1684                         else
1685                                 search_tbl->ant_type = ANT_BC;
1686
1687                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1688                                 break;
1689
1690                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1691                                                  search_tbl, index);
1692                         if (!ret)
1693                                 goto out;
1694                         break;
1695                 case IWL_SISO_SWITCH_GI:
1696                         if (!tbl->is_ht40 && !(ht_cap->cap &
1697                                                 IEEE80211_HT_CAP_SGI_20))
1698                                 break;
1699                         if (tbl->is_ht40 && !(ht_cap->cap &
1700                                                 IEEE80211_HT_CAP_SGI_40))
1701                                 break;
1702
1703                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1704
1705                         memcpy(search_tbl, tbl, sz);
1706                         if (is_green) {
1707                                 if (!tbl->is_SGI)
1708                                         break;
1709                                 else
1710                                         IWL_ERR(priv,
1711                                                 "SGI was set in GF+SISO\n");
1712                         }
1713                         search_tbl->is_SGI = !tbl->is_SGI;
1714                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1715                         if (tbl->is_SGI) {
1716                                 s32 tpt = lq_sta->last_tpt / 100;
1717                                 if (tpt >= search_tbl->expected_tpt[index])
1718                                         break;
1719                         }
1720                         search_tbl->current_rate =
1721                                 rate_n_flags_from_tbl(priv, search_tbl,
1722                                                       index, is_green);
1723                         update_search_tbl_counter = 1;
1724                         goto out;
1725                 case IWL_SISO_SWITCH_MIMO3_ABC:
1726                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1727                         memcpy(search_tbl, tbl, sz);
1728                         search_tbl->is_SGI = 0;
1729                         search_tbl->ant_type = ANT_ABC;
1730
1731                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1732                                 break;
1733
1734                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1735                                                  search_tbl, index);
1736                         if (!ret)
1737                                 goto out;
1738                         break;
1739                 }
1740                 tbl->action++;
1741                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1742                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1743
1744                 if (tbl->action == start_action)
1745                         break;
1746         }
1747         search_tbl->lq_type = LQ_NONE;
1748         return;
1749
1750  out:
1751         lq_sta->search_better_tbl = 1;
1752         tbl->action++;
1753         if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1754                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1755         if (update_search_tbl_counter)
1756                 search_tbl->action = tbl->action;
1757 }
1758
1759 /*
1760  * Try to switch to new modulation mode from MIMO2
1761  */
1762 static void rs_move_mimo2_to_other(struct iwl_priv *priv,
1763                                    struct iwl_lq_sta *lq_sta,
1764                                    struct ieee80211_conf *conf,
1765                                    struct ieee80211_sta *sta, int index)
1766 {
1767         s8 is_green = lq_sta->is_green;
1768         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1769         struct iwl_scale_tbl_info *search_tbl =
1770                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1771         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1772         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1773         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1774                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1775         u8 start_action;
1776         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1777         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1778         u8 update_search_tbl_counter = 0;
1779         int ret;
1780
1781         switch (priv->bt_traffic_load) {
1782         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1783                 /* nothing */
1784                 break;
1785         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1786         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1787                 /* avoid antenna B and MIMO */
1788                 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1789                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1790                 break;
1791         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1792                 /* avoid antenna B unless MIMO */
1793                 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1794                     tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1795                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1796                 break;
1797         default:
1798                 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1799                 break;
1800         }
1801
1802         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1803             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1804              tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1805                 /* switch in SISO */
1806                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1807         }
1808
1809         /* configure as 1x1 if bt full concurrency */
1810         if (priv->bt_full_concurrent &&
1811             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1812              tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1813                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1814
1815         start_action = tbl->action;
1816         for (;;) {
1817                 lq_sta->action_counter++;
1818                 switch (tbl->action) {
1819                 case IWL_MIMO2_SWITCH_ANTENNA1:
1820                 case IWL_MIMO2_SWITCH_ANTENNA2:
1821                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1822
1823                         if (tx_chains_num <= 2)
1824                                 break;
1825
1826                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1827                                 break;
1828
1829                         memcpy(search_tbl, tbl, sz);
1830                         if (rs_toggle_antenna(valid_tx_ant,
1831                                        &search_tbl->current_rate, search_tbl)) {
1832                                 update_search_tbl_counter = 1;
1833                                 goto out;
1834                         }
1835                         break;
1836                 case IWL_MIMO2_SWITCH_SISO_A:
1837                 case IWL_MIMO2_SWITCH_SISO_B:
1838                 case IWL_MIMO2_SWITCH_SISO_C:
1839                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1840
1841                         /* Set up new search table for SISO */
1842                         memcpy(search_tbl, tbl, sz);
1843
1844                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1845                                 search_tbl->ant_type = ANT_A;
1846                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1847                                 search_tbl->ant_type = ANT_B;
1848                         else
1849                                 search_tbl->ant_type = ANT_C;
1850
1851                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1852                                 break;
1853
1854                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1855                                                  search_tbl, index);
1856                         if (!ret)
1857                                 goto out;
1858
1859                         break;
1860
1861                 case IWL_MIMO2_SWITCH_GI:
1862                         if (!tbl->is_ht40 && !(ht_cap->cap &
1863                                                 IEEE80211_HT_CAP_SGI_20))
1864                                 break;
1865                         if (tbl->is_ht40 && !(ht_cap->cap &
1866                                                 IEEE80211_HT_CAP_SGI_40))
1867                                 break;
1868
1869                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1870
1871                         /* Set up new search table for MIMO2 */
1872                         memcpy(search_tbl, tbl, sz);
1873                         search_tbl->is_SGI = !tbl->is_SGI;
1874                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1875                         /*
1876                          * If active table already uses the fastest possible
1877                          * modulation (dual stream with short guard interval),
1878                          * and it's working well, there's no need to look
1879                          * for a better type of modulation!
1880                          */
1881                         if (tbl->is_SGI) {
1882                                 s32 tpt = lq_sta->last_tpt / 100;
1883                                 if (tpt >= search_tbl->expected_tpt[index])
1884                                         break;
1885                         }
1886                         search_tbl->current_rate =
1887                                 rate_n_flags_from_tbl(priv, search_tbl,
1888                                                       index, is_green);
1889                         update_search_tbl_counter = 1;
1890                         goto out;
1891
1892                 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1893                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1894                         memcpy(search_tbl, tbl, sz);
1895                         search_tbl->is_SGI = 0;
1896                         search_tbl->ant_type = ANT_ABC;
1897
1898                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1899                                 break;
1900
1901                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1902                                                  search_tbl, index);
1903                         if (!ret)
1904                                 goto out;
1905
1906                         break;
1907                 }
1908                 tbl->action++;
1909                 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1910                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1911
1912                 if (tbl->action == start_action)
1913                         break;
1914         }
1915         search_tbl->lq_type = LQ_NONE;
1916         return;
1917  out:
1918         lq_sta->search_better_tbl = 1;
1919         tbl->action++;
1920         if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1921                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1922         if (update_search_tbl_counter)
1923                 search_tbl->action = tbl->action;
1924
1925 }
1926
1927 /*
1928  * Try to switch to new modulation mode from MIMO3
1929  */
1930 static void rs_move_mimo3_to_other(struct iwl_priv *priv,
1931                                    struct iwl_lq_sta *lq_sta,
1932                                    struct ieee80211_conf *conf,
1933                                    struct ieee80211_sta *sta, int index)
1934 {
1935         s8 is_green = lq_sta->is_green;
1936         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1937         struct iwl_scale_tbl_info *search_tbl =
1938                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1939         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1940         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1941         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1942                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1943         u8 start_action;
1944         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1945         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1946         int ret;
1947         u8 update_search_tbl_counter = 0;
1948
1949         switch (priv->bt_traffic_load) {
1950         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1951                 /* nothing */
1952                 break;
1953         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1954         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1955                 /* avoid antenna B and MIMO */
1956                 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1957                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1958                 break;
1959         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1960                 /* avoid antenna B unless MIMO */
1961                 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1962                     tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1963                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1964                 break;
1965         default:
1966                 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1967                 break;
1968         }
1969
1970         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1971             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1972              tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1973                 /* switch in SISO */
1974                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1975         }
1976
1977         /* configure as 1x1 if bt full concurrency */
1978         if (priv->bt_full_concurrent &&
1979             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1980              tbl->action > IWL_MIMO3_SWITCH_SISO_C))
1981                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1982
1983         start_action = tbl->action;
1984         for (;;) {
1985                 lq_sta->action_counter++;
1986                 switch (tbl->action) {
1987                 case IWL_MIMO3_SWITCH_ANTENNA1:
1988                 case IWL_MIMO3_SWITCH_ANTENNA2:
1989                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1990
1991                         if (tx_chains_num <= 3)
1992                                 break;
1993
1994                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1995                                 break;
1996
1997                         memcpy(search_tbl, tbl, sz);
1998                         if (rs_toggle_antenna(valid_tx_ant,
1999                                        &search_tbl->current_rate, search_tbl))
2000                                 goto out;
2001                         break;
2002                 case IWL_MIMO3_SWITCH_SISO_A:
2003                 case IWL_MIMO3_SWITCH_SISO_B:
2004                 case IWL_MIMO3_SWITCH_SISO_C:
2005                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2006
2007                         /* Set up new search table for SISO */
2008                         memcpy(search_tbl, tbl, sz);
2009
2010                         if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2011                                 search_tbl->ant_type = ANT_A;
2012                         else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2013                                 search_tbl->ant_type = ANT_B;
2014                         else
2015                                 search_tbl->ant_type = ANT_C;
2016
2017                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2018                                 break;
2019
2020                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2021                                                  search_tbl, index);
2022                         if (!ret)
2023                                 goto out;
2024
2025                         break;
2026
2027                 case IWL_MIMO3_SWITCH_MIMO2_AB:
2028                 case IWL_MIMO3_SWITCH_MIMO2_AC:
2029                 case IWL_MIMO3_SWITCH_MIMO2_BC:
2030                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2031
2032                         memcpy(search_tbl, tbl, sz);
2033                         search_tbl->is_SGI = 0;
2034                         if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2035                                 search_tbl->ant_type = ANT_AB;
2036                         else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2037                                 search_tbl->ant_type = ANT_AC;
2038                         else
2039                                 search_tbl->ant_type = ANT_BC;
2040
2041                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2042                                 break;
2043
2044                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2045                                                  search_tbl, index);
2046                         if (!ret)
2047                                 goto out;
2048
2049                         break;
2050
2051                 case IWL_MIMO3_SWITCH_GI:
2052                         if (!tbl->is_ht40 && !(ht_cap->cap &
2053                                                 IEEE80211_HT_CAP_SGI_20))
2054                                 break;
2055                         if (tbl->is_ht40 && !(ht_cap->cap &
2056                                                 IEEE80211_HT_CAP_SGI_40))
2057                                 break;
2058
2059                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2060
2061                         /* Set up new search table for MIMO */
2062                         memcpy(search_tbl, tbl, sz);
2063                         search_tbl->is_SGI = !tbl->is_SGI;
2064                         rs_set_expected_tpt_table(lq_sta, search_tbl);
2065                         /*
2066                          * If active table already uses the fastest possible
2067                          * modulation (dual stream with short guard interval),
2068                          * and it's working well, there's no need to look
2069                          * for a better type of modulation!
2070                          */
2071                         if (tbl->is_SGI) {
2072                                 s32 tpt = lq_sta->last_tpt / 100;
2073                                 if (tpt >= search_tbl->expected_tpt[index])
2074                                         break;
2075                         }
2076                         search_tbl->current_rate =
2077                                 rate_n_flags_from_tbl(priv, search_tbl,
2078                                                       index, is_green);
2079                         update_search_tbl_counter = 1;
2080                         goto out;
2081                 }
2082                 tbl->action++;
2083                 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2084                         tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2085
2086                 if (tbl->action == start_action)
2087                         break;
2088         }
2089         search_tbl->lq_type = LQ_NONE;
2090         return;
2091  out:
2092         lq_sta->search_better_tbl = 1;
2093         tbl->action++;
2094         if (tbl->action > IWL_MIMO3_SWITCH_GI)
2095                 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2096         if (update_search_tbl_counter)
2097                 search_tbl->action = tbl->action;
2098 }
2099
2100 /*
2101  * Check whether we should continue using same modulation mode, or
2102  * begin search for a new mode, based on:
2103  * 1) # tx successes or failures while using this mode
2104  * 2) # times calling this function
2105  * 3) elapsed time in this mode (not used, for now)
2106  */
2107 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2108 {
2109         struct iwl_scale_tbl_info *tbl;
2110         int i;
2111         int active_tbl;
2112         int flush_interval_passed = 0;
2113         struct iwl_priv *priv;
2114
2115         priv = lq_sta->drv;
2116         active_tbl = lq_sta->active_tbl;
2117
2118         tbl = &(lq_sta->lq_info[active_tbl]);
2119
2120         /* If we've been disallowing search, see if we should now allow it */
2121         if (lq_sta->stay_in_tbl) {
2122
2123                 /* Elapsed time using current modulation mode */
2124                 if (lq_sta->flush_timer)
2125                         flush_interval_passed =
2126                         time_after(jiffies,
2127                                         (unsigned long)(lq_sta->flush_timer +
2128                                         IWL_RATE_SCALE_FLUSH_INTVL));
2129
2130                 /*
2131                  * Check if we should allow search for new modulation mode.
2132                  * If many frames have failed or succeeded, or we've used
2133                  * this same modulation for a long time, allow search, and
2134                  * reset history stats that keep track of whether we should
2135                  * allow a new search.  Also (below) reset all bitmaps and
2136                  * stats in active history.
2137                  */
2138                 if (force_search ||
2139                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2140                     (lq_sta->total_success > lq_sta->max_success_limit) ||
2141                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2142                      && (flush_interval_passed))) {
2143                         IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n",
2144                                      lq_sta->total_failed,
2145                                      lq_sta->total_success,
2146                                      flush_interval_passed);
2147
2148                         /* Allow search for new mode */
2149                         lq_sta->stay_in_tbl = 0;        /* only place reset */
2150                         lq_sta->total_failed = 0;
2151                         lq_sta->total_success = 0;
2152                         lq_sta->flush_timer = 0;
2153
2154                 /*
2155                  * Else if we've used this modulation mode enough repetitions
2156                  * (regardless of elapsed time or success/failure), reset
2157                  * history bitmaps and rate-specific stats for all rates in
2158                  * active table.
2159                  */
2160                 } else {
2161                         lq_sta->table_count++;
2162                         if (lq_sta->table_count >=
2163                             lq_sta->table_count_limit) {
2164                                 lq_sta->table_count = 0;
2165
2166                                 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2167                                 for (i = 0; i < IWL_RATE_COUNT; i++)
2168                                         rs_rate_scale_clear_window(
2169                                                 &(tbl->win[i]));
2170                         }
2171                 }
2172
2173                 /* If transitioning to allow "search", reset all history
2174                  * bitmaps and stats in active table (this will become the new
2175                  * "search" table). */
2176                 if (!lq_sta->stay_in_tbl) {
2177                         for (i = 0; i < IWL_RATE_COUNT; i++)
2178                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2179                 }
2180         }
2181 }
2182
2183 /*
2184  * setup rate table in uCode
2185  */
2186 static void rs_update_rate_tbl(struct iwl_priv *priv,
2187                                struct iwl_rxon_context *ctx,
2188                                struct iwl_lq_sta *lq_sta,
2189                                struct iwl_scale_tbl_info *tbl,
2190                                int index, u8 is_green)
2191 {
2192         u32 rate;
2193
2194         /* Update uCode's rate table. */
2195         rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2196         rs_fill_link_cmd(priv, lq_sta, rate);
2197         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2198 }
2199
2200 /*
2201  * Do rate scaling and search for new modulation mode.
2202  */
2203 static void rs_rate_scale_perform(struct iwl_priv *priv,
2204                                   struct sk_buff *skb,
2205                                   struct ieee80211_sta *sta,
2206                                   struct iwl_lq_sta *lq_sta)
2207 {
2208         struct ieee80211_hw *hw = priv->hw;
2209         struct ieee80211_conf *conf = &hw->conf;
2210         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2211         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2212         int low = IWL_RATE_INVALID;
2213         int high = IWL_RATE_INVALID;
2214         int index;
2215         int i;
2216         struct iwl_rate_scale_data *window = NULL;
2217         int current_tpt = IWL_INVALID_VALUE;
2218         int low_tpt = IWL_INVALID_VALUE;
2219         int high_tpt = IWL_INVALID_VALUE;
2220         u32 fail_count;
2221         s8 scale_action = 0;
2222         u16 rate_mask;
2223         u8 update_lq = 0;
2224         struct iwl_scale_tbl_info *tbl, *tbl1;
2225         u16 rate_scale_index_msk = 0;
2226         u8 is_green = 0;
2227         u8 active_tbl = 0;
2228         u8 done_search = 0;
2229         u16 high_low;
2230         s32 sr;
2231         u8 tid = IWL_MAX_TID_COUNT;
2232         struct iwl_tid_data *tid_data;
2233         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2234         struct iwl_rxon_context *ctx = sta_priv->ctx;
2235
2236         IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2237
2238         /* Send management frames and NO_ACK data using lowest rate. */
2239         /* TODO: this could probably be improved.. */
2240         if (!ieee80211_is_data(hdr->frame_control) ||
2241             info->flags & IEEE80211_TX_CTL_NO_ACK)
2242                 return;
2243
2244         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2245
2246         tid = rs_tl_add_packet(lq_sta, hdr);
2247         if ((tid != IWL_MAX_TID_COUNT) &&
2248             (lq_sta->tx_agg_tid_en & (1 << tid))) {
2249                 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid];
2250                 if (tid_data->agg.state == IWL_AGG_OFF)
2251                         lq_sta->is_agg = 0;
2252                 else
2253                         lq_sta->is_agg = 1;
2254         } else
2255                 lq_sta->is_agg = 0;
2256
2257         /*
2258          * Select rate-scale / modulation-mode table to work with in
2259          * the rest of this function:  "search" if searching for better
2260          * modulation mode, or "active" if doing rate scaling within a mode.
2261          */
2262         if (!lq_sta->search_better_tbl)
2263                 active_tbl = lq_sta->active_tbl;
2264         else
2265                 active_tbl = 1 - lq_sta->active_tbl;
2266
2267         tbl = &(lq_sta->lq_info[active_tbl]);
2268         if (is_legacy(tbl->lq_type))
2269                 lq_sta->is_green = 0;
2270         else
2271                 lq_sta->is_green = rs_use_green(sta);
2272         is_green = lq_sta->is_green;
2273
2274         /* current tx rate */
2275         index = lq_sta->last_txrate_idx;
2276
2277         IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2278                        tbl->lq_type);
2279
2280         /* rates available for this association, and for modulation mode */
2281         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2282
2283         IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2284
2285         /* mask with station rate restriction */
2286         if (is_legacy(tbl->lq_type)) {
2287                 if (lq_sta->band == NL80211_BAND_5GHZ)
2288                         /* supp_rates has no CCK bits in A mode */
2289                         rate_scale_index_msk = (u16) (rate_mask &
2290                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2291                 else
2292                         rate_scale_index_msk = (u16) (rate_mask &
2293                                                       lq_sta->supp_rates);
2294
2295         } else
2296                 rate_scale_index_msk = rate_mask;
2297
2298         if (!rate_scale_index_msk)
2299                 rate_scale_index_msk = rate_mask;
2300
2301         if (!((1 << index) & rate_scale_index_msk)) {
2302                 IWL_ERR(priv, "Current Rate is not valid\n");
2303                 if (lq_sta->search_better_tbl) {
2304                         /* revert to active table if search table is not valid*/
2305                         tbl->lq_type = LQ_NONE;
2306                         lq_sta->search_better_tbl = 0;
2307                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2308                         /* get "active" rate info */
2309                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2310                         rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2311                                            index, is_green);
2312                 }
2313                 return;
2314         }
2315
2316         /* Get expected throughput table and history window for current rate */
2317         if (!tbl->expected_tpt) {
2318                 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2319                 return;
2320         }
2321
2322         /* force user max rate if set by user */
2323         if ((lq_sta->max_rate_idx != -1) &&
2324             (lq_sta->max_rate_idx < index)) {
2325                 index = lq_sta->max_rate_idx;
2326                 update_lq = 1;
2327                 window = &(tbl->win[index]);
2328                 goto lq_update;
2329         }
2330
2331         window = &(tbl->win[index]);
2332
2333         /*
2334          * If there is not enough history to calculate actual average
2335          * throughput, keep analyzing results of more tx frames, without
2336          * changing rate or mode (bypass most of the rest of this function).
2337          * Set up new rate table in uCode only if old rate is not supported
2338          * in current association (use new rate found above).
2339          */
2340         fail_count = window->counter - window->success_counter;
2341         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2342                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2343                 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2344                                "for index %d\n",
2345                                window->success_counter, window->counter, index);
2346
2347                 /* Can't calculate this yet; not enough history */
2348                 window->average_tpt = IWL_INVALID_VALUE;
2349
2350                 /* Should we stay with this modulation mode,
2351                  * or search for a new one? */
2352                 rs_stay_in_table(lq_sta, false);
2353
2354                 goto out;
2355         }
2356         /* Else we have enough samples; calculate estimate of
2357          * actual average throughput */
2358         if (window->average_tpt != ((window->success_ratio *
2359                         tbl->expected_tpt[index] + 64) / 128)) {
2360                 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2361                 window->average_tpt = ((window->success_ratio *
2362                                         tbl->expected_tpt[index] + 64) / 128);
2363         }
2364
2365         /* If we are searching for better modulation mode, check success. */
2366         if (lq_sta->search_better_tbl &&
2367             (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2368                 /* If good success, continue using the "search" mode;
2369                  * no need to send new link quality command, since we're
2370                  * continuing to use the setup that we've been trying. */
2371                 if (window->average_tpt > lq_sta->last_tpt) {
2372
2373                         IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2374                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2375                                         window->success_ratio,
2376                                         window->average_tpt,
2377                                         lq_sta->last_tpt);
2378
2379                         if (!is_legacy(tbl->lq_type))
2380                                 lq_sta->enable_counter = 1;
2381
2382                         /* Swap tables; "search" becomes "active" */
2383                         lq_sta->active_tbl = active_tbl;
2384                         current_tpt = window->average_tpt;
2385
2386                 /* Else poor success; go back to mode in "active" table */
2387                 } else {
2388
2389                         IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2390                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2391                                         window->success_ratio,
2392                                         window->average_tpt,
2393                                         lq_sta->last_tpt);
2394
2395                         /* Nullify "search" table */
2396                         tbl->lq_type = LQ_NONE;
2397
2398                         /* Revert to "active" table */
2399                         active_tbl = lq_sta->active_tbl;
2400                         tbl = &(lq_sta->lq_info[active_tbl]);
2401
2402                         /* Revert to "active" rate and throughput info */
2403                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2404                         current_tpt = lq_sta->last_tpt;
2405
2406                         /* Need to set up a new rate table in uCode */
2407                         update_lq = 1;
2408                 }
2409
2410                 /* Either way, we've made a decision; modulation mode
2411                  * search is done, allow rate adjustment next time. */
2412                 lq_sta->search_better_tbl = 0;
2413                 done_search = 1;        /* Don't switch modes below! */
2414                 goto lq_update;
2415         }
2416
2417         /* (Else) not in search of better modulation mode, try for better
2418          * starting rate, while staying in this mode. */
2419         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2420                                         tbl->lq_type);
2421         low = high_low & 0xff;
2422         high = (high_low >> 8) & 0xff;
2423
2424         /* If user set max rate, dont allow higher than user constrain */
2425         if ((lq_sta->max_rate_idx != -1) &&
2426             (lq_sta->max_rate_idx < high))
2427                 high = IWL_RATE_INVALID;
2428
2429         sr = window->success_ratio;
2430
2431         /* Collect measured throughputs for current and adjacent rates */
2432         current_tpt = window->average_tpt;
2433         if (low != IWL_RATE_INVALID)
2434                 low_tpt = tbl->win[low].average_tpt;
2435         if (high != IWL_RATE_INVALID)
2436                 high_tpt = tbl->win[high].average_tpt;
2437
2438         scale_action = 0;
2439
2440         /* Too many failures, decrease rate */
2441         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2442                 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2443                 scale_action = -1;
2444
2445         /* No throughput measured yet for adjacent rates; try increase. */
2446         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2447                    (high_tpt == IWL_INVALID_VALUE)) {
2448
2449                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2450                         scale_action = 1;
2451                 else if (low != IWL_RATE_INVALID)
2452                         scale_action = 0;
2453         }
2454
2455         /* Both adjacent throughputs are measured, but neither one has better
2456          * throughput; we're using the best rate, don't change it! */
2457         else if ((low_tpt != IWL_INVALID_VALUE) &&
2458                  (high_tpt != IWL_INVALID_VALUE) &&
2459                  (low_tpt < current_tpt) &&
2460                  (high_tpt < current_tpt))
2461                 scale_action = 0;
2462
2463         /* At least one adjacent rate's throughput is measured,
2464          * and may have better performance. */
2465         else {
2466                 /* Higher adjacent rate's throughput is measured */
2467                 if (high_tpt != IWL_INVALID_VALUE) {
2468                         /* Higher rate has better throughput */
2469                         if (high_tpt > current_tpt &&
2470                                         sr >= IWL_RATE_INCREASE_TH) {
2471                                 scale_action = 1;
2472                         } else {
2473                                 scale_action = 0;
2474                         }
2475
2476                 /* Lower adjacent rate's throughput is measured */
2477                 } else if (low_tpt != IWL_INVALID_VALUE) {
2478                         /* Lower rate has better throughput */
2479                         if (low_tpt > current_tpt) {
2480                                 IWL_DEBUG_RATE(priv,
2481                                     "decrease rate because of low tpt\n");
2482                                 scale_action = -1;
2483                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2484                                 scale_action = 1;
2485                         }
2486                 }
2487         }
2488
2489         /* Sanity check; asked for decrease, but success rate or throughput
2490          * has been good at old rate.  Don't change it. */
2491         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2492                     ((sr > IWL_RATE_HIGH_TH) ||
2493                      (current_tpt > (100 * tbl->expected_tpt[low]))))
2494                 scale_action = 0;
2495         if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2496                 scale_action = -1;
2497         if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2498                 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2499                 scale_action = -1;
2500
2501         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2502              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2503                 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2504                         /*
2505                          * don't set scale_action, don't want to scale up if
2506                          * the rate scale doesn't otherwise think that is a
2507                          * good idea.
2508                          */
2509                 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2510                         scale_action = -1;
2511                 }
2512         }
2513         lq_sta->last_bt_traffic = priv->bt_traffic_load;
2514
2515         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2516              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2517                 /* search for a new modulation */
2518                 rs_stay_in_table(lq_sta, true);
2519                 goto lq_update;
2520         }
2521
2522         switch (scale_action) {
2523         case -1:
2524                 /* Decrease starting rate, update uCode's rate table */
2525                 if (low != IWL_RATE_INVALID) {
2526                         update_lq = 1;
2527                         index = low;
2528                 }
2529
2530                 break;
2531         case 1:
2532                 /* Increase starting rate, update uCode's rate table */
2533                 if (high != IWL_RATE_INVALID) {
2534                         update_lq = 1;
2535                         index = high;
2536                 }
2537
2538                 break;
2539         case 0:
2540                 /* No change */
2541         default:
2542                 break;
2543         }
2544
2545         IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2546                     "high %d type %d\n",
2547                      index, scale_action, low, high, tbl->lq_type);
2548
2549 lq_update:
2550         /* Replace uCode's rate table for the destination station. */
2551         if (update_lq)
2552                 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2553
2554         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2555                 /* Should we stay with this modulation mode,
2556                  * or search for a new one? */
2557           rs_stay_in_table(lq_sta, false);
2558         }
2559         /*
2560          * Search for new modulation mode if we're:
2561          * 1)  Not changing rates right now
2562          * 2)  Not just finishing up a search
2563          * 3)  Allowing a new search
2564          */
2565         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2566                 /* Save current throughput to compare with "search" throughput*/
2567                 lq_sta->last_tpt = current_tpt;
2568
2569                 /* Select a new "search" modulation mode to try.
2570                  * If one is found, set up the new "search" table. */
2571                 if (is_legacy(tbl->lq_type))
2572                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2573                 else if (is_siso(tbl->lq_type))
2574                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2575                 else if (is_mimo2(tbl->lq_type))
2576                         rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2577                 else
2578                         rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2579
2580                 /* If new "search" mode was selected, set up in uCode table */
2581                 if (lq_sta->search_better_tbl) {
2582                         /* Access the "search" table, clear its history. */
2583                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2584                         for (i = 0; i < IWL_RATE_COUNT; i++)
2585                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2586
2587                         /* Use new "search" start rate */
2588                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2589
2590                         IWL_DEBUG_RATE(priv, "Switch current  mcs: %X index: %d\n",
2591                                      tbl->current_rate, index);
2592                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2593                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2594                 } else
2595                         done_search = 1;
2596         }
2597
2598         if (done_search && !lq_sta->stay_in_tbl) {
2599                 /* If the "active" (non-search) mode was legacy,
2600                  * and we've tried switching antennas,
2601                  * but we haven't been able to try HT modes (not available),
2602                  * stay with best antenna legacy modulation for a while
2603                  * before next round of mode comparisons. */
2604                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2605                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2606                     lq_sta->action_counter > tbl1->max_search) {
2607                         IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2608                         rs_set_stay_in_table(priv, 1, lq_sta);
2609                 }
2610
2611                 /* If we're in an HT mode, and all 3 mode switch actions
2612                  * have been tried and compared, stay in this best modulation
2613                  * mode for a while before next round of mode comparisons. */
2614                 if (lq_sta->enable_counter &&
2615                     (lq_sta->action_counter >= tbl1->max_search) &&
2616                     iwl_ht_enabled(priv)) {
2617                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2618                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2619                             (tid != IWL_MAX_TID_COUNT)) {
2620                                 u8 sta_id = lq_sta->lq.sta_id;
2621                                 tid_data = &priv->tid_data[sta_id][tid];
2622                                 if (tid_data->agg.state == IWL_AGG_OFF) {
2623                                         IWL_DEBUG_RATE(priv,
2624                                                        "try to aggregate tid %d\n",
2625                                                        tid);
2626                                         rs_tl_turn_on_agg(priv, tid,
2627                                                           lq_sta, sta);
2628                                 }
2629                         }
2630                         rs_set_stay_in_table(priv, 0, lq_sta);
2631                 }
2632         }
2633
2634 out:
2635         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2636         lq_sta->last_txrate_idx = index;
2637 }
2638
2639 /**
2640  * rs_initialize_lq - Initialize a station's hardware rate table
2641  *
2642  * The uCode's station table contains a table of fallback rates
2643  * for automatic fallback during transmission.
2644  *
2645  * NOTE: This sets up a default set of values.  These will be replaced later
2646  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2647  *       rc80211_simple.
2648  *
2649  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2650  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2651  *       which requires station table entry to exist).
2652  */
2653 static void rs_initialize_lq(struct iwl_priv *priv,
2654                              struct ieee80211_sta *sta,
2655                              struct iwl_lq_sta *lq_sta)
2656 {
2657         struct iwl_scale_tbl_info *tbl;
2658         int rate_idx;
2659         int i;
2660         u32 rate;
2661         u8 use_green = rs_use_green(sta);
2662         u8 active_tbl = 0;
2663         u8 valid_tx_ant;
2664         struct iwl_station_priv *sta_priv;
2665         struct iwl_rxon_context *ctx;
2666
2667         if (!sta || !lq_sta)
2668                 return;
2669
2670         sta_priv = (void *)sta->drv_priv;
2671         ctx = sta_priv->ctx;
2672
2673         i = lq_sta->last_txrate_idx;
2674
2675         valid_tx_ant = priv->nvm_data->valid_tx_ant;
2676
2677         if (!lq_sta->search_better_tbl)
2678                 active_tbl = lq_sta->active_tbl;
2679         else
2680                 active_tbl = 1 - lq_sta->active_tbl;
2681
2682         tbl = &(lq_sta->lq_info[active_tbl]);
2683
2684         if ((i < 0) || (i >= IWL_RATE_COUNT))
2685                 i = 0;
2686
2687         rate = iwl_rates[i].plcp;
2688         tbl->ant_type = first_antenna(valid_tx_ant);
2689         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2690
2691         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2692                 rate |= RATE_MCS_CCK_MSK;
2693
2694         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2695         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2696             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2697
2698         rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2699         tbl->current_rate = rate;
2700         rs_set_expected_tpt_table(lq_sta, tbl);
2701         rs_fill_link_cmd(NULL, lq_sta, rate);
2702         priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2703         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, 0, true);
2704 }
2705
2706 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2707                         struct ieee80211_tx_rate_control *txrc)
2708 {
2709
2710         struct sk_buff *skb = txrc->skb;
2711         struct ieee80211_supported_band *sband = txrc->sband;
2712         struct iwl_op_mode *op_mode __maybe_unused =
2713                         (struct iwl_op_mode *)priv_r;
2714         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2715         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2716         struct iwl_lq_sta *lq_sta = priv_sta;
2717         int rate_idx;
2718
2719         IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2720
2721         /* Get max rate if user set max rate */
2722         if (lq_sta) {
2723                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2724                 if ((sband->band == NL80211_BAND_5GHZ) &&
2725                     (lq_sta->max_rate_idx != -1))
2726                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2727                 if ((lq_sta->max_rate_idx < 0) ||
2728                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2729                         lq_sta->max_rate_idx = -1;
2730         }
2731
2732         /* Treat uninitialized rate scaling data same as non-existing. */
2733         if (lq_sta && !lq_sta->drv) {
2734                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2735                 priv_sta = NULL;
2736         }
2737
2738         /* Send management frames and NO_ACK data using lowest rate. */
2739         if (rate_control_send_low(sta, priv_sta, txrc))
2740                 return;
2741
2742         rate_idx  = lq_sta->last_txrate_idx;
2743
2744         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2745                 rate_idx -= IWL_FIRST_OFDM_RATE;
2746                 /* 6M and 9M shared same MCS index */
2747                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2748                 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2749                     IWL_RATE_MIMO3_6M_PLCP)
2750                         rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2751                 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2752                          IWL_RATE_MIMO2_6M_PLCP)
2753                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2754                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2755                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2756                         info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2757                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2758                         info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2759                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2760                         info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2761                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2762                         info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2763         } else {
2764                 /* Check for invalid rates */
2765                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2766                                 ((sband->band == NL80211_BAND_5GHZ) &&
2767                                  (rate_idx < IWL_FIRST_OFDM_RATE)))
2768                         rate_idx = rate_lowest_index(sband, sta);
2769                 /* On valid 5 GHz rate, adjust index */
2770                 else if (sband->band == NL80211_BAND_5GHZ)
2771                         rate_idx -= IWL_FIRST_OFDM_RATE;
2772                 info->control.rates[0].flags = 0;
2773         }
2774         info->control.rates[0].idx = rate_idx;
2775         info->control.rates[0].count = 1;
2776 }
2777
2778 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2779                           gfp_t gfp)
2780 {
2781         struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2782         struct iwl_op_mode *op_mode __maybe_unused =
2783                         (struct iwl_op_mode *)priv_rate;
2784         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2785
2786         IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2787
2788         return &sta_priv->lq_sta;
2789 }
2790
2791 /*
2792  * Called after adding a new station to initialize rate scaling
2793  */
2794 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2795 {
2796         int i, j;
2797         struct ieee80211_hw *hw = priv->hw;
2798         struct ieee80211_conf *conf = &priv->hw->conf;
2799         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2800         struct iwl_station_priv *sta_priv;
2801         struct iwl_lq_sta *lq_sta;
2802         struct ieee80211_supported_band *sband;
2803         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2804
2805         sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2806         lq_sta = &sta_priv->lq_sta;
2807         sband = hw->wiphy->bands[conf->chandef.chan->band];
2808
2809
2810         lq_sta->lq.sta_id = sta_id;
2811
2812         for (j = 0; j < LQ_SIZE; j++)
2813                 for (i = 0; i < IWL_RATE_COUNT; i++)
2814                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2815
2816         lq_sta->flush_timer = 0;
2817         lq_sta->supp_rates = sta->supp_rates[sband->band];
2818
2819         IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2820                        sta_id);
2821         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2822          * the lowest or the highest rate.. Could consider using RSSI from
2823          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2824          * after assoc.. */
2825
2826         lq_sta->is_dup = 0;
2827         lq_sta->max_rate_idx = -1;
2828         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2829         lq_sta->is_green = rs_use_green(sta);
2830         lq_sta->band = sband->band;
2831         /*
2832          * active legacy rates as per supported rates bitmap
2833          */
2834         supp = sta->supp_rates[sband->band];
2835         lq_sta->active_legacy_rate = 0;
2836         for_each_set_bit(i, &supp, BITS_PER_LONG)
2837                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2838
2839         /*
2840          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2841          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2842          */
2843         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2844         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2845         lq_sta->active_siso_rate &= ~((u16)0x2);
2846         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2847
2848         /* Same here */
2849         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2850         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2851         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2852         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2853
2854         lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2855         lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2856         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2857         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2858
2859         IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2860                      lq_sta->active_siso_rate,
2861                      lq_sta->active_mimo2_rate,
2862                      lq_sta->active_mimo3_rate);
2863
2864         /* These values will be overridden later */
2865         lq_sta->lq.general_params.single_stream_ant_msk =
2866                 first_antenna(priv->nvm_data->valid_tx_ant);
2867         lq_sta->lq.general_params.dual_stream_ant_msk =
2868                 priv->nvm_data->valid_tx_ant &
2869                 ~first_antenna(priv->nvm_data->valid_tx_ant);
2870         if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2871                 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2872         } else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) {
2873                 lq_sta->lq.general_params.dual_stream_ant_msk =
2874                         priv->nvm_data->valid_tx_ant;
2875         }
2876
2877         /* as default allow aggregation for all tids */
2878         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2879         lq_sta->drv = priv;
2880
2881         /* Set last_txrate_idx to lowest rate */
2882         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2883         if (sband->band == NL80211_BAND_5GHZ)
2884                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2885         lq_sta->is_agg = 0;
2886 #ifdef CONFIG_MAC80211_DEBUGFS
2887         lq_sta->dbg_fixed_rate = 0;
2888 #endif
2889
2890         rs_initialize_lq(priv, sta, lq_sta);
2891 }
2892
2893 static void rs_fill_link_cmd(struct iwl_priv *priv,
2894                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2895 {
2896         struct iwl_scale_tbl_info tbl_type;
2897         int index = 0;
2898         int rate_idx;
2899         int repeat_rate = 0;
2900         u8 ant_toggle_cnt = 0;
2901         u8 use_ht_possible = 1;
2902         u8 valid_tx_ant = 0;
2903         struct iwl_station_priv *sta_priv =
2904                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2905         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2906
2907         /* Override starting rate (index 0) if needed for debug purposes */
2908         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2909
2910         /* Interpret new_rate (rate_n_flags) */
2911         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2912                                   &tbl_type, &rate_idx);
2913
2914         if (priv && priv->bt_full_concurrent) {
2915                 /* 1x1 only */
2916                 tbl_type.ant_type =
2917                         first_antenna(priv->nvm_data->valid_tx_ant);
2918         }
2919
2920         /* How many times should we repeat the initial rate? */
2921         if (is_legacy(tbl_type.lq_type)) {
2922                 ant_toggle_cnt = 1;
2923                 repeat_rate = IWL_NUMBER_TRY;
2924         } else {
2925                 repeat_rate = min(IWL_HT_NUMBER_TRY,
2926                                   LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2927         }
2928
2929         lq_cmd->general_params.mimo_delimiter =
2930                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2931
2932         /* Fill 1st table entry (index 0) */
2933         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2934
2935         if (num_of_ant(tbl_type.ant_type) == 1) {
2936                 lq_cmd->general_params.single_stream_ant_msk =
2937                                                 tbl_type.ant_type;
2938         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2939                 lq_cmd->general_params.dual_stream_ant_msk =
2940                                                 tbl_type.ant_type;
2941         } /* otherwise we don't modify the existing value */
2942
2943         index++;
2944         repeat_rate--;
2945         if (priv) {
2946                 if (priv->bt_full_concurrent)
2947                         valid_tx_ant = ANT_A;
2948                 else
2949                         valid_tx_ant = priv->nvm_data->valid_tx_ant;
2950         }
2951
2952         /* Fill rest of rate table */
2953         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2954                 /* Repeat initial/next rate.
2955                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2956                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2957                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2958                         if (is_legacy(tbl_type.lq_type)) {
2959                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2960                                         ant_toggle_cnt++;
2961                                 else if (priv &&
2962                                          rs_toggle_antenna(valid_tx_ant,
2963                                                         &new_rate, &tbl_type))
2964                                         ant_toggle_cnt = 1;
2965                         }
2966
2967                         /* Override next rate if needed for debug purposes */
2968                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2969
2970                         /* Fill next table entry */
2971                         lq_cmd->rs_table[index].rate_n_flags =
2972                                         cpu_to_le32(new_rate);
2973                         repeat_rate--;
2974                         index++;
2975                 }
2976
2977                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2978                                                 &rate_idx);
2979
2980                 if (priv && priv->bt_full_concurrent) {
2981                         /* 1x1 only */
2982                         tbl_type.ant_type =
2983                             first_antenna(priv->nvm_data->valid_tx_ant);
2984                 }
2985
2986                 /* Indicate to uCode which entries might be MIMO.
2987                  * If initial rate was MIMO, this will finally end up
2988                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2989                 if (is_mimo(tbl_type.lq_type))
2990                         lq_cmd->general_params.mimo_delimiter = index;
2991
2992                 /* Get next rate */
2993                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2994                                              use_ht_possible);
2995
2996                 /* How many times should we repeat the next rate? */
2997                 if (is_legacy(tbl_type.lq_type)) {
2998                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2999                                 ant_toggle_cnt++;
3000                         else if (priv &&
3001                                  rs_toggle_antenna(valid_tx_ant,
3002                                                    &new_rate, &tbl_type))
3003                                 ant_toggle_cnt = 1;
3004
3005                         repeat_rate = IWL_NUMBER_TRY;
3006                 } else {
3007                         repeat_rate = IWL_HT_NUMBER_TRY;
3008                 }
3009
3010                 /* Don't allow HT rates after next pass.
3011                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3012                 use_ht_possible = 0;
3013
3014                 /* Override next rate if needed for debug purposes */
3015                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3016
3017                 /* Fill next table entry */
3018                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3019
3020                 index++;
3021                 repeat_rate--;
3022         }
3023
3024         lq_cmd->agg_params.agg_frame_cnt_limit =
3025                 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3026         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3027
3028         lq_cmd->agg_params.agg_time_limit =
3029                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3030         /*
3031          * overwrite if needed, pass aggregation time limit
3032          * to uCode in uSec
3033          */
3034         if (priv && priv->lib->bt_params &&
3035             priv->lib->bt_params->agg_time_limit &&
3036             priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3037                 lq_cmd->agg_params.agg_time_limit =
3038                         cpu_to_le16(priv->lib->bt_params->agg_time_limit);
3039 }
3040
3041 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3042 {
3043         return hw->priv;
3044 }
3045 /* rate scale requires free function to be implemented */
3046 static void rs_free(void *priv_rate)
3047 {
3048         return;
3049 }
3050
3051 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3052                         void *priv_sta)
3053 {
3054         struct iwl_op_mode *op_mode __maybe_unused = priv_r;
3055         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
3056
3057         IWL_DEBUG_RATE(priv, "enter\n");
3058         IWL_DEBUG_RATE(priv, "leave\n");
3059 }
3060
3061 #ifdef CONFIG_MAC80211_DEBUGFS
3062 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3063                              u32 *rate_n_flags, int index)
3064 {
3065         struct iwl_priv *priv;
3066         u8 valid_tx_ant;
3067         u8 ant_sel_tx;
3068
3069         priv = lq_sta->drv;
3070         valid_tx_ant = priv->nvm_data->valid_tx_ant;
3071         if (lq_sta->dbg_fixed_rate) {
3072                 ant_sel_tx =
3073                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3074                   >> RATE_MCS_ANT_POS);
3075                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3076                         *rate_n_flags = lq_sta->dbg_fixed_rate;
3077                         IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3078                 } else {
3079                         lq_sta->dbg_fixed_rate = 0;
3080                         IWL_ERR(priv,
3081                             "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3082                             ant_sel_tx, valid_tx_ant);
3083                         IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3084                 }
3085         } else {
3086                 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3087         }
3088 }
3089
3090 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3091                         const char __user *user_buf, size_t count, loff_t *ppos)
3092 {
3093         struct iwl_lq_sta *lq_sta = file->private_data;
3094         struct iwl_priv *priv;
3095         char buf[64];
3096         size_t buf_size;
3097         u32 parsed_rate;
3098
3099
3100         priv = lq_sta->drv;
3101         memset(buf, 0, sizeof(buf));
3102         buf_size = min(count, sizeof(buf) -  1);
3103         if (copy_from_user(buf, user_buf, buf_size))
3104                 return -EFAULT;
3105
3106         if (sscanf(buf, "%x", &parsed_rate) == 1)
3107                 lq_sta->dbg_fixed_rate = parsed_rate;
3108         else
3109                 lq_sta->dbg_fixed_rate = 0;
3110
3111         rs_program_fix_rate(priv, lq_sta);
3112
3113         return count;
3114 }
3115
3116 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3117                         char __user *user_buf, size_t count, loff_t *ppos)
3118 {
3119         char *buff;
3120         int desc = 0;
3121         int i = 0;
3122         int index = 0;
3123         ssize_t ret;
3124
3125         struct iwl_lq_sta *lq_sta = file->private_data;
3126         struct iwl_priv *priv;
3127         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3128
3129         priv = lq_sta->drv;
3130         buff = kmalloc(1024, GFP_KERNEL);
3131         if (!buff)
3132                 return -ENOMEM;
3133
3134         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3135         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3136                         lq_sta->total_failed, lq_sta->total_success,
3137                         lq_sta->active_legacy_rate);
3138         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3139                         lq_sta->dbg_fixed_rate);
3140         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3141             (priv->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3142             (priv->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3143             (priv->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3144         desc += sprintf(buff+desc, "lq type %s\n",
3145            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3146         if (is_Ht(tbl->lq_type)) {
3147                 desc += sprintf(buff + desc, " %s",
3148                    (is_siso(tbl->lq_type)) ? "SISO" :
3149                    ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3150                 desc += sprintf(buff + desc, " %s",
3151                    (tbl->is_ht40) ? "40MHz" : "20MHz");
3152                 desc += sprintf(buff + desc, " %s %s %s\n",
3153                    (tbl->is_SGI) ? "SGI" : "",
3154                    (lq_sta->is_green) ? "GF enabled" : "",
3155                    (lq_sta->is_agg) ? "AGG on" : "");
3156         }
3157         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3158                 lq_sta->last_rate_n_flags);
3159         desc += sprintf(buff+desc, "general:"
3160                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3161                 lq_sta->lq.general_params.flags,
3162                 lq_sta->lq.general_params.mimo_delimiter,
3163                 lq_sta->lq.general_params.single_stream_ant_msk,
3164                 lq_sta->lq.general_params.dual_stream_ant_msk);
3165
3166         desc += sprintf(buff+desc, "agg:"
3167                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3168                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3169                         lq_sta->lq.agg_params.agg_dis_start_th,
3170                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
3171
3172         desc += sprintf(buff+desc,
3173                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3174                         lq_sta->lq.general_params.start_rate_index[0],
3175                         lq_sta->lq.general_params.start_rate_index[1],
3176                         lq_sta->lq.general_params.start_rate_index[2],
3177                         lq_sta->lq.general_params.start_rate_index[3]);
3178
3179         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3180                 index = iwl_hwrate_to_plcp_idx(
3181                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3182                 if (is_legacy(tbl->lq_type)) {
3183                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3184                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3185                                 iwl_rate_mcs[index].mbps);
3186                 } else {
3187                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3188                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3189                                 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3190                 }
3191         }
3192
3193         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3194         kfree(buff);
3195         return ret;
3196 }
3197
3198 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3199         .write = rs_sta_dbgfs_scale_table_write,
3200         .read = rs_sta_dbgfs_scale_table_read,
3201         .open = simple_open,
3202         .llseek = default_llseek,
3203 };
3204 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3205                         char __user *user_buf, size_t count, loff_t *ppos)
3206 {
3207         char *buff;
3208         int desc = 0;
3209         int i, j;
3210         ssize_t ret;
3211
3212         struct iwl_lq_sta *lq_sta = file->private_data;
3213
3214         buff = kmalloc(1024, GFP_KERNEL);
3215         if (!buff)
3216                 return -ENOMEM;
3217
3218         for (i = 0; i < LQ_SIZE; i++) {
3219                 desc += sprintf(buff+desc,
3220                                 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3221                                 "rate=0x%X\n",
3222                                 lq_sta->active_tbl == i ? "*" : "x",
3223                                 lq_sta->lq_info[i].lq_type,
3224                                 lq_sta->lq_info[i].is_SGI,
3225                                 lq_sta->lq_info[i].is_ht40,
3226                                 lq_sta->lq_info[i].is_dup,
3227                                 lq_sta->is_green,
3228                                 lq_sta->lq_info[i].current_rate);
3229                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3230                         desc += sprintf(buff+desc,
3231                                 "counter=%d success=%d %%=%d\n",
3232                                 lq_sta->lq_info[i].win[j].counter,
3233                                 lq_sta->lq_info[i].win[j].success_counter,
3234                                 lq_sta->lq_info[i].win[j].success_ratio);
3235                 }
3236         }
3237         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3238         kfree(buff);
3239         return ret;
3240 }
3241
3242 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3243         .read = rs_sta_dbgfs_stats_table_read,
3244         .open = simple_open,
3245         .llseek = default_llseek,
3246 };
3247
3248 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3249                         char __user *user_buf, size_t count, loff_t *ppos)
3250 {
3251         struct iwl_lq_sta *lq_sta = file->private_data;
3252         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3253         char buff[120];
3254         int desc = 0;
3255
3256         if (is_Ht(tbl->lq_type))
3257                 desc += sprintf(buff+desc,
3258                                 "Bit Rate= %d Mb/s\n",
3259                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3260         else
3261                 desc += sprintf(buff+desc,
3262                                 "Bit Rate= %d Mb/s\n",
3263                                 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3264
3265         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3266 }
3267
3268 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3269         .read = rs_sta_dbgfs_rate_scale_data_read,
3270         .open = simple_open,
3271         .llseek = default_llseek,
3272 };
3273
3274 static void rs_add_debugfs(void *priv, void *priv_sta,
3275                                         struct dentry *dir)
3276 {
3277         struct iwl_lq_sta *lq_sta = priv_sta;
3278         lq_sta->rs_sta_dbgfs_scale_table_file =
3279                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3280                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3281         lq_sta->rs_sta_dbgfs_stats_table_file =
3282                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3283                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
3284         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3285                 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3286                         lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3287         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3288                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3289                 &lq_sta->tx_agg_tid_en);
3290
3291 }
3292
3293 static void rs_remove_debugfs(void *priv, void *priv_sta)
3294 {
3295         struct iwl_lq_sta *lq_sta = priv_sta;
3296         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3297         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3298         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3299         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3300 }
3301 #endif
3302
3303 /*
3304  * Initialization of rate scaling information is done by driver after
3305  * the station is added. Since mac80211 calls this function before a
3306  * station is added we ignore it.
3307  */
3308 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3309                               struct cfg80211_chan_def *chandef,
3310                               struct ieee80211_sta *sta, void *priv_sta)
3311 {
3312 }
3313
3314 static const struct rate_control_ops rs_ops = {
3315         .name = RS_NAME,
3316         .tx_status = rs_tx_status,
3317         .get_rate = rs_get_rate,
3318         .rate_init = rs_rate_init_stub,
3319         .alloc = rs_alloc,
3320         .free = rs_free,
3321         .alloc_sta = rs_alloc_sta,
3322         .free_sta = rs_free_sta,
3323 #ifdef CONFIG_MAC80211_DEBUGFS
3324         .add_sta_debugfs = rs_add_debugfs,
3325         .remove_sta_debugfs = rs_remove_debugfs,
3326 #endif
3327 };
3328
3329 int iwlagn_rate_control_register(void)
3330 {
3331         return ieee80211_rate_control_register(&rs_ops);
3332 }
3333
3334 void iwlagn_rate_control_unregister(void)
3335 {
3336         ieee80211_rate_control_unregister(&rs_ops);
3337 }
3338