kernel/drivers/net/wireless/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 <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/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 ieee80211_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 == IEEE80211_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 == IEEE80211_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 == IEEE80211_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 == IEEE80211_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 == IEEE80211_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 int 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 0;
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         return 0;
1588
1589 }
1590
1591 /*
1592  * Try to switch to new modulation mode from SISO
1593  */
1594 static int rs_move_siso_to_other(struct iwl_priv *priv,
1595                                  struct iwl_lq_sta *lq_sta,
1596                                  struct ieee80211_conf *conf,
1597                                  struct ieee80211_sta *sta, int index)
1598 {
1599         u8 is_green = lq_sta->is_green;
1600         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1601         struct iwl_scale_tbl_info *search_tbl =
1602                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1603         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1604         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1605         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1606                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1607         u8 start_action;
1608         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1609         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1610         u8 update_search_tbl_counter = 0;
1611         int ret;
1612
1613         switch (priv->bt_traffic_load) {
1614         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1615                 /* nothing */
1616                 break;
1617         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1618                 /* avoid antenna B unless MIMO */
1619                 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1620                         tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1621                 break;
1622         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1623         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1624                 /* avoid antenna B and MIMO */
1625                 valid_tx_ant =
1626                         first_antenna(priv->nvm_data->valid_tx_ant);
1627                 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1628                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1629                 break;
1630         default:
1631                 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1632                 break;
1633         }
1634
1635         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1636             tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1637                 /* stay in SISO */
1638                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1639         }
1640
1641         /* configure as 1x1 if bt full concurrency */
1642         if (priv->bt_full_concurrent) {
1643                 valid_tx_ant =
1644                         first_antenna(priv->nvm_data->valid_tx_ant);
1645                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1646                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1647         }
1648
1649         start_action = tbl->action;
1650         for (;;) {
1651                 lq_sta->action_counter++;
1652                 switch (tbl->action) {
1653                 case IWL_SISO_SWITCH_ANTENNA1:
1654                 case IWL_SISO_SWITCH_ANTENNA2:
1655                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1656                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1657                                                 tx_chains_num <= 1) ||
1658                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1659                                                 tx_chains_num <= 2))
1660                                 break;
1661
1662                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1663                             !priv->bt_full_concurrent &&
1664                             priv->bt_traffic_load ==
1665                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1666                                 break;
1667
1668                         memcpy(search_tbl, tbl, sz);
1669                         if (rs_toggle_antenna(valid_tx_ant,
1670                                        &search_tbl->current_rate, search_tbl)) {
1671                                 update_search_tbl_counter = 1;
1672                                 goto out;
1673                         }
1674                         break;
1675                 case IWL_SISO_SWITCH_MIMO2_AB:
1676                 case IWL_SISO_SWITCH_MIMO2_AC:
1677                 case IWL_SISO_SWITCH_MIMO2_BC:
1678                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1679                         memcpy(search_tbl, tbl, sz);
1680                         search_tbl->is_SGI = 0;
1681
1682                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1683                                 search_tbl->ant_type = ANT_AB;
1684                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1685                                 search_tbl->ant_type = ANT_AC;
1686                         else
1687                                 search_tbl->ant_type = ANT_BC;
1688
1689                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1690                                 break;
1691
1692                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1693                                                  search_tbl, index);
1694                         if (!ret)
1695                                 goto out;
1696                         break;
1697                 case IWL_SISO_SWITCH_GI:
1698                         if (!tbl->is_ht40 && !(ht_cap->cap &
1699                                                 IEEE80211_HT_CAP_SGI_20))
1700                                 break;
1701                         if (tbl->is_ht40 && !(ht_cap->cap &
1702                                                 IEEE80211_HT_CAP_SGI_40))
1703                                 break;
1704
1705                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1706
1707                         memcpy(search_tbl, tbl, sz);
1708                         if (is_green) {
1709                                 if (!tbl->is_SGI)
1710                                         break;
1711                                 else
1712                                         IWL_ERR(priv,
1713                                                 "SGI was set in GF+SISO\n");
1714                         }
1715                         search_tbl->is_SGI = !tbl->is_SGI;
1716                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1717                         if (tbl->is_SGI) {
1718                                 s32 tpt = lq_sta->last_tpt / 100;
1719                                 if (tpt >= search_tbl->expected_tpt[index])
1720                                         break;
1721                         }
1722                         search_tbl->current_rate =
1723                                 rate_n_flags_from_tbl(priv, search_tbl,
1724                                                       index, is_green);
1725                         update_search_tbl_counter = 1;
1726                         goto out;
1727                 case IWL_SISO_SWITCH_MIMO3_ABC:
1728                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1729                         memcpy(search_tbl, tbl, sz);
1730                         search_tbl->is_SGI = 0;
1731                         search_tbl->ant_type = ANT_ABC;
1732
1733                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1734                                 break;
1735
1736                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1737                                                  search_tbl, index);
1738                         if (!ret)
1739                                 goto out;
1740                         break;
1741                 }
1742                 tbl->action++;
1743                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1744                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1745
1746                 if (tbl->action == start_action)
1747                         break;
1748         }
1749         search_tbl->lq_type = LQ_NONE;
1750         return 0;
1751
1752  out:
1753         lq_sta->search_better_tbl = 1;
1754         tbl->action++;
1755         if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1756                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1757         if (update_search_tbl_counter)
1758                 search_tbl->action = tbl->action;
1759
1760         return 0;
1761 }
1762
1763 /*
1764  * Try to switch to new modulation mode from MIMO2
1765  */
1766 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1767                                  struct iwl_lq_sta *lq_sta,
1768                                  struct ieee80211_conf *conf,
1769                                  struct ieee80211_sta *sta, int index)
1770 {
1771         s8 is_green = lq_sta->is_green;
1772         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1773         struct iwl_scale_tbl_info *search_tbl =
1774                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1775         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1776         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1777         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1778                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1779         u8 start_action;
1780         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1781         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1782         u8 update_search_tbl_counter = 0;
1783         int ret;
1784
1785         switch (priv->bt_traffic_load) {
1786         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1787                 /* nothing */
1788                 break;
1789         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1790         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1791                 /* avoid antenna B and MIMO */
1792                 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1793                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1794                 break;
1795         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1796                 /* avoid antenna B unless MIMO */
1797                 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1798                     tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1799                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1800                 break;
1801         default:
1802                 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1803                 break;
1804         }
1805
1806         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1807             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1808              tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1809                 /* switch in SISO */
1810                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1811         }
1812
1813         /* configure as 1x1 if bt full concurrency */
1814         if (priv->bt_full_concurrent &&
1815             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1816              tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1817                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1818
1819         start_action = tbl->action;
1820         for (;;) {
1821                 lq_sta->action_counter++;
1822                 switch (tbl->action) {
1823                 case IWL_MIMO2_SWITCH_ANTENNA1:
1824                 case IWL_MIMO2_SWITCH_ANTENNA2:
1825                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1826
1827                         if (tx_chains_num <= 2)
1828                                 break;
1829
1830                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1831                                 break;
1832
1833                         memcpy(search_tbl, tbl, sz);
1834                         if (rs_toggle_antenna(valid_tx_ant,
1835                                        &search_tbl->current_rate, search_tbl)) {
1836                                 update_search_tbl_counter = 1;
1837                                 goto out;
1838                         }
1839                         break;
1840                 case IWL_MIMO2_SWITCH_SISO_A:
1841                 case IWL_MIMO2_SWITCH_SISO_B:
1842                 case IWL_MIMO2_SWITCH_SISO_C:
1843                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1844
1845                         /* Set up new search table for SISO */
1846                         memcpy(search_tbl, tbl, sz);
1847
1848                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1849                                 search_tbl->ant_type = ANT_A;
1850                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1851                                 search_tbl->ant_type = ANT_B;
1852                         else
1853                                 search_tbl->ant_type = ANT_C;
1854
1855                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1856                                 break;
1857
1858                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1859                                                  search_tbl, index);
1860                         if (!ret)
1861                                 goto out;
1862
1863                         break;
1864
1865                 case IWL_MIMO2_SWITCH_GI:
1866                         if (!tbl->is_ht40 && !(ht_cap->cap &
1867                                                 IEEE80211_HT_CAP_SGI_20))
1868                                 break;
1869                         if (tbl->is_ht40 && !(ht_cap->cap &
1870                                                 IEEE80211_HT_CAP_SGI_40))
1871                                 break;
1872
1873                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1874
1875                         /* Set up new search table for MIMO2 */
1876                         memcpy(search_tbl, tbl, sz);
1877                         search_tbl->is_SGI = !tbl->is_SGI;
1878                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1879                         /*
1880                          * If active table already uses the fastest possible
1881                          * modulation (dual stream with short guard interval),
1882                          * and it's working well, there's no need to look
1883                          * for a better type of modulation!
1884                          */
1885                         if (tbl->is_SGI) {
1886                                 s32 tpt = lq_sta->last_tpt / 100;
1887                                 if (tpt >= search_tbl->expected_tpt[index])
1888                                         break;
1889                         }
1890                         search_tbl->current_rate =
1891                                 rate_n_flags_from_tbl(priv, search_tbl,
1892                                                       index, is_green);
1893                         update_search_tbl_counter = 1;
1894                         goto out;
1895
1896                 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1897                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1898                         memcpy(search_tbl, tbl, sz);
1899                         search_tbl->is_SGI = 0;
1900                         search_tbl->ant_type = ANT_ABC;
1901
1902                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1903                                 break;
1904
1905                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1906                                                  search_tbl, index);
1907                         if (!ret)
1908                                 goto out;
1909
1910                         break;
1911                 }
1912                 tbl->action++;
1913                 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1914                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1915
1916                 if (tbl->action == start_action)
1917                         break;
1918         }
1919         search_tbl->lq_type = LQ_NONE;
1920         return 0;
1921  out:
1922         lq_sta->search_better_tbl = 1;
1923         tbl->action++;
1924         if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1925                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1926         if (update_search_tbl_counter)
1927                 search_tbl->action = tbl->action;
1928
1929         return 0;
1930
1931 }
1932
1933 /*
1934  * Try to switch to new modulation mode from MIMO3
1935  */
1936 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1937                                  struct iwl_lq_sta *lq_sta,
1938                                  struct ieee80211_conf *conf,
1939                                  struct ieee80211_sta *sta, int index)
1940 {
1941         s8 is_green = lq_sta->is_green;
1942         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1943         struct iwl_scale_tbl_info *search_tbl =
1944                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1945         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1946         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1947         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1948                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1949         u8 start_action;
1950         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1951         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1952         int ret;
1953         u8 update_search_tbl_counter = 0;
1954
1955         switch (priv->bt_traffic_load) {
1956         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1957                 /* nothing */
1958                 break;
1959         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1960         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1961                 /* avoid antenna B and MIMO */
1962                 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1963                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1964                 break;
1965         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1966                 /* avoid antenna B unless MIMO */
1967                 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1968                     tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1969                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1970                 break;
1971         default:
1972                 IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1973                 break;
1974         }
1975
1976         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1977             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1978              tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1979                 /* switch in SISO */
1980                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1981         }
1982
1983         /* configure as 1x1 if bt full concurrency */
1984         if (priv->bt_full_concurrent &&
1985             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1986              tbl->action > IWL_MIMO3_SWITCH_SISO_C))
1987                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1988
1989         start_action = tbl->action;
1990         for (;;) {
1991                 lq_sta->action_counter++;
1992                 switch (tbl->action) {
1993                 case IWL_MIMO3_SWITCH_ANTENNA1:
1994                 case IWL_MIMO3_SWITCH_ANTENNA2:
1995                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1996
1997                         if (tx_chains_num <= 3)
1998                                 break;
1999
2000                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2001                                 break;
2002
2003                         memcpy(search_tbl, tbl, sz);
2004                         if (rs_toggle_antenna(valid_tx_ant,
2005                                        &search_tbl->current_rate, search_tbl))
2006                                 goto out;
2007                         break;
2008                 case IWL_MIMO3_SWITCH_SISO_A:
2009                 case IWL_MIMO3_SWITCH_SISO_B:
2010                 case IWL_MIMO3_SWITCH_SISO_C:
2011                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2012
2013                         /* Set up new search table for SISO */
2014                         memcpy(search_tbl, tbl, sz);
2015
2016                         if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2017                                 search_tbl->ant_type = ANT_A;
2018                         else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2019                                 search_tbl->ant_type = ANT_B;
2020                         else
2021                                 search_tbl->ant_type = ANT_C;
2022
2023                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2024                                 break;
2025
2026                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2027                                                  search_tbl, index);
2028                         if (!ret)
2029                                 goto out;
2030
2031                         break;
2032
2033                 case IWL_MIMO3_SWITCH_MIMO2_AB:
2034                 case IWL_MIMO3_SWITCH_MIMO2_AC:
2035                 case IWL_MIMO3_SWITCH_MIMO2_BC:
2036                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2037
2038                         memcpy(search_tbl, tbl, sz);
2039                         search_tbl->is_SGI = 0;
2040                         if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2041                                 search_tbl->ant_type = ANT_AB;
2042                         else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2043                                 search_tbl->ant_type = ANT_AC;
2044                         else
2045                                 search_tbl->ant_type = ANT_BC;
2046
2047                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2048                                 break;
2049
2050                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2051                                                  search_tbl, index);
2052                         if (!ret)
2053                                 goto out;
2054
2055                         break;
2056
2057                 case IWL_MIMO3_SWITCH_GI:
2058                         if (!tbl->is_ht40 && !(ht_cap->cap &
2059                                                 IEEE80211_HT_CAP_SGI_20))
2060                                 break;
2061                         if (tbl->is_ht40 && !(ht_cap->cap &
2062                                                 IEEE80211_HT_CAP_SGI_40))
2063                                 break;
2064
2065                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2066
2067                         /* Set up new search table for MIMO */
2068                         memcpy(search_tbl, tbl, sz);
2069                         search_tbl->is_SGI = !tbl->is_SGI;
2070                         rs_set_expected_tpt_table(lq_sta, search_tbl);
2071                         /*
2072                          * If active table already uses the fastest possible
2073                          * modulation (dual stream with short guard interval),
2074                          * and it's working well, there's no need to look
2075                          * for a better type of modulation!
2076                          */
2077                         if (tbl->is_SGI) {
2078                                 s32 tpt = lq_sta->last_tpt / 100;
2079                                 if (tpt >= search_tbl->expected_tpt[index])
2080                                         break;
2081                         }
2082                         search_tbl->current_rate =
2083                                 rate_n_flags_from_tbl(priv, search_tbl,
2084                                                       index, is_green);
2085                         update_search_tbl_counter = 1;
2086                         goto out;
2087                 }
2088                 tbl->action++;
2089                 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2090                         tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2091
2092                 if (tbl->action == start_action)
2093                         break;
2094         }
2095         search_tbl->lq_type = LQ_NONE;
2096         return 0;
2097  out:
2098         lq_sta->search_better_tbl = 1;
2099         tbl->action++;
2100         if (tbl->action > IWL_MIMO3_SWITCH_GI)
2101                 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2102         if (update_search_tbl_counter)
2103                 search_tbl->action = tbl->action;
2104
2105         return 0;
2106
2107 }
2108
2109 /*
2110  * Check whether we should continue using same modulation mode, or
2111  * begin search for a new mode, based on:
2112  * 1) # tx successes or failures while using this mode
2113  * 2) # times calling this function
2114  * 3) elapsed time in this mode (not used, for now)
2115  */
2116 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2117 {
2118         struct iwl_scale_tbl_info *tbl;
2119         int i;
2120         int active_tbl;
2121         int flush_interval_passed = 0;
2122         struct iwl_priv *priv;
2123
2124         priv = lq_sta->drv;
2125         active_tbl = lq_sta->active_tbl;
2126
2127         tbl = &(lq_sta->lq_info[active_tbl]);
2128
2129         /* If we've been disallowing search, see if we should now allow it */
2130         if (lq_sta->stay_in_tbl) {
2131
2132                 /* Elapsed time using current modulation mode */
2133                 if (lq_sta->flush_timer)
2134                         flush_interval_passed =
2135                         time_after(jiffies,
2136                                         (unsigned long)(lq_sta->flush_timer +
2137                                         IWL_RATE_SCALE_FLUSH_INTVL));
2138
2139                 /*
2140                  * Check if we should allow search for new modulation mode.
2141                  * If many frames have failed or succeeded, or we've used
2142                  * this same modulation for a long time, allow search, and
2143                  * reset history stats that keep track of whether we should
2144                  * allow a new search.  Also (below) reset all bitmaps and
2145                  * stats in active history.
2146                  */
2147                 if (force_search ||
2148                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2149                     (lq_sta->total_success > lq_sta->max_success_limit) ||
2150                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2151                      && (flush_interval_passed))) {
2152                         IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n",
2153                                      lq_sta->total_failed,
2154                                      lq_sta->total_success,
2155                                      flush_interval_passed);
2156
2157                         /* Allow search for new mode */
2158                         lq_sta->stay_in_tbl = 0;        /* only place reset */
2159                         lq_sta->total_failed = 0;
2160                         lq_sta->total_success = 0;
2161                         lq_sta->flush_timer = 0;
2162
2163                 /*
2164                  * Else if we've used this modulation mode enough repetitions
2165                  * (regardless of elapsed time or success/failure), reset
2166                  * history bitmaps and rate-specific stats for all rates in
2167                  * active table.
2168                  */
2169                 } else {
2170                         lq_sta->table_count++;
2171                         if (lq_sta->table_count >=
2172                             lq_sta->table_count_limit) {
2173                                 lq_sta->table_count = 0;
2174
2175                                 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2176                                 for (i = 0; i < IWL_RATE_COUNT; i++)
2177                                         rs_rate_scale_clear_window(
2178                                                 &(tbl->win[i]));
2179                         }
2180                 }
2181
2182                 /* If transitioning to allow "search", reset all history
2183                  * bitmaps and stats in active table (this will become the new
2184                  * "search" table). */
2185                 if (!lq_sta->stay_in_tbl) {
2186                         for (i = 0; i < IWL_RATE_COUNT; i++)
2187                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2188                 }
2189         }
2190 }
2191
2192 /*
2193  * setup rate table in uCode
2194  */
2195 static void rs_update_rate_tbl(struct iwl_priv *priv,
2196                                struct iwl_rxon_context *ctx,
2197                                struct iwl_lq_sta *lq_sta,
2198                                struct iwl_scale_tbl_info *tbl,
2199                                int index, u8 is_green)
2200 {
2201         u32 rate;
2202
2203         /* Update uCode's rate table. */
2204         rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2205         rs_fill_link_cmd(priv, lq_sta, rate);
2206         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2207 }
2208
2209 /*
2210  * Do rate scaling and search for new modulation mode.
2211  */
2212 static void rs_rate_scale_perform(struct iwl_priv *priv,
2213                                   struct sk_buff *skb,
2214                                   struct ieee80211_sta *sta,
2215                                   struct iwl_lq_sta *lq_sta)
2216 {
2217         struct ieee80211_hw *hw = priv->hw;
2218         struct ieee80211_conf *conf = &hw->conf;
2219         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2220         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2221         int low = IWL_RATE_INVALID;
2222         int high = IWL_RATE_INVALID;
2223         int index;
2224         int i;
2225         struct iwl_rate_scale_data *window = NULL;
2226         int current_tpt = IWL_INVALID_VALUE;
2227         int low_tpt = IWL_INVALID_VALUE;
2228         int high_tpt = IWL_INVALID_VALUE;
2229         u32 fail_count;
2230         s8 scale_action = 0;
2231         u16 rate_mask;
2232         u8 update_lq = 0;
2233         struct iwl_scale_tbl_info *tbl, *tbl1;
2234         u16 rate_scale_index_msk = 0;
2235         u8 is_green = 0;
2236         u8 active_tbl = 0;
2237         u8 done_search = 0;
2238         u16 high_low;
2239         s32 sr;
2240         u8 tid = IWL_MAX_TID_COUNT;
2241         struct iwl_tid_data *tid_data;
2242         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2243         struct iwl_rxon_context *ctx = sta_priv->ctx;
2244
2245         IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2246
2247         /* Send management frames and NO_ACK data using lowest rate. */
2248         /* TODO: this could probably be improved.. */
2249         if (!ieee80211_is_data(hdr->frame_control) ||
2250             info->flags & IEEE80211_TX_CTL_NO_ACK)
2251                 return;
2252
2253         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2254
2255         tid = rs_tl_add_packet(lq_sta, hdr);
2256         if ((tid != IWL_MAX_TID_COUNT) &&
2257             (lq_sta->tx_agg_tid_en & (1 << tid))) {
2258                 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid];
2259                 if (tid_data->agg.state == IWL_AGG_OFF)
2260                         lq_sta->is_agg = 0;
2261                 else
2262                         lq_sta->is_agg = 1;
2263         } else
2264                 lq_sta->is_agg = 0;
2265
2266         /*
2267          * Select rate-scale / modulation-mode table to work with in
2268          * the rest of this function:  "search" if searching for better
2269          * modulation mode, or "active" if doing rate scaling within a mode.
2270          */
2271         if (!lq_sta->search_better_tbl)
2272                 active_tbl = lq_sta->active_tbl;
2273         else
2274                 active_tbl = 1 - lq_sta->active_tbl;
2275
2276         tbl = &(lq_sta->lq_info[active_tbl]);
2277         if (is_legacy(tbl->lq_type))
2278                 lq_sta->is_green = 0;
2279         else
2280                 lq_sta->is_green = rs_use_green(sta);
2281         is_green = lq_sta->is_green;
2282
2283         /* current tx rate */
2284         index = lq_sta->last_txrate_idx;
2285
2286         IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2287                        tbl->lq_type);
2288
2289         /* rates available for this association, and for modulation mode */
2290         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2291
2292         IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2293
2294         /* mask with station rate restriction */
2295         if (is_legacy(tbl->lq_type)) {
2296                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2297                         /* supp_rates has no CCK bits in A mode */
2298                         rate_scale_index_msk = (u16) (rate_mask &
2299                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2300                 else
2301                         rate_scale_index_msk = (u16) (rate_mask &
2302                                                       lq_sta->supp_rates);
2303
2304         } else
2305                 rate_scale_index_msk = rate_mask;
2306
2307         if (!rate_scale_index_msk)
2308                 rate_scale_index_msk = rate_mask;
2309
2310         if (!((1 << index) & rate_scale_index_msk)) {
2311                 IWL_ERR(priv, "Current Rate is not valid\n");
2312                 if (lq_sta->search_better_tbl) {
2313                         /* revert to active table if search table is not valid*/
2314                         tbl->lq_type = LQ_NONE;
2315                         lq_sta->search_better_tbl = 0;
2316                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2317                         /* get "active" rate info */
2318                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2319                         rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2320                                            index, is_green);
2321                 }
2322                 return;
2323         }
2324
2325         /* Get expected throughput table and history window for current rate */
2326         if (!tbl->expected_tpt) {
2327                 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2328                 return;
2329         }
2330
2331         /* force user max rate if set by user */
2332         if ((lq_sta->max_rate_idx != -1) &&
2333             (lq_sta->max_rate_idx < index)) {
2334                 index = lq_sta->max_rate_idx;
2335                 update_lq = 1;
2336                 window = &(tbl->win[index]);
2337                 goto lq_update;
2338         }
2339
2340         window = &(tbl->win[index]);
2341
2342         /*
2343          * If there is not enough history to calculate actual average
2344          * throughput, keep analyzing results of more tx frames, without
2345          * changing rate or mode (bypass most of the rest of this function).
2346          * Set up new rate table in uCode only if old rate is not supported
2347          * in current association (use new rate found above).
2348          */
2349         fail_count = window->counter - window->success_counter;
2350         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2351                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2352                 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2353                                "for index %d\n",
2354                                window->success_counter, window->counter, index);
2355
2356                 /* Can't calculate this yet; not enough history */
2357                 window->average_tpt = IWL_INVALID_VALUE;
2358
2359                 /* Should we stay with this modulation mode,
2360                  * or search for a new one? */
2361                 rs_stay_in_table(lq_sta, false);
2362
2363                 goto out;
2364         }
2365         /* Else we have enough samples; calculate estimate of
2366          * actual average throughput */
2367         if (window->average_tpt != ((window->success_ratio *
2368                         tbl->expected_tpt[index] + 64) / 128)) {
2369                 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2370                 window->average_tpt = ((window->success_ratio *
2371                                         tbl->expected_tpt[index] + 64) / 128);
2372         }
2373
2374         /* If we are searching for better modulation mode, check success. */
2375         if (lq_sta->search_better_tbl &&
2376             (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2377                 /* If good success, continue using the "search" mode;
2378                  * no need to send new link quality command, since we're
2379                  * continuing to use the setup that we've been trying. */
2380                 if (window->average_tpt > lq_sta->last_tpt) {
2381
2382                         IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2383                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2384                                         window->success_ratio,
2385                                         window->average_tpt,
2386                                         lq_sta->last_tpt);
2387
2388                         if (!is_legacy(tbl->lq_type))
2389                                 lq_sta->enable_counter = 1;
2390
2391                         /* Swap tables; "search" becomes "active" */
2392                         lq_sta->active_tbl = active_tbl;
2393                         current_tpt = window->average_tpt;
2394
2395                 /* Else poor success; go back to mode in "active" table */
2396                 } else {
2397
2398                         IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2399                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2400                                         window->success_ratio,
2401                                         window->average_tpt,
2402                                         lq_sta->last_tpt);
2403
2404                         /* Nullify "search" table */
2405                         tbl->lq_type = LQ_NONE;
2406
2407                         /* Revert to "active" table */
2408                         active_tbl = lq_sta->active_tbl;
2409                         tbl = &(lq_sta->lq_info[active_tbl]);
2410
2411                         /* Revert to "active" rate and throughput info */
2412                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2413                         current_tpt = lq_sta->last_tpt;
2414
2415                         /* Need to set up a new rate table in uCode */
2416                         update_lq = 1;
2417                 }
2418
2419                 /* Either way, we've made a decision; modulation mode
2420                  * search is done, allow rate adjustment next time. */
2421                 lq_sta->search_better_tbl = 0;
2422                 done_search = 1;        /* Don't switch modes below! */
2423                 goto lq_update;
2424         }
2425
2426         /* (Else) not in search of better modulation mode, try for better
2427          * starting rate, while staying in this mode. */
2428         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2429                                         tbl->lq_type);
2430         low = high_low & 0xff;
2431         high = (high_low >> 8) & 0xff;
2432
2433         /* If user set max rate, dont allow higher than user constrain */
2434         if ((lq_sta->max_rate_idx != -1) &&
2435             (lq_sta->max_rate_idx < high))
2436                 high = IWL_RATE_INVALID;
2437
2438         sr = window->success_ratio;
2439
2440         /* Collect measured throughputs for current and adjacent rates */
2441         current_tpt = window->average_tpt;
2442         if (low != IWL_RATE_INVALID)
2443                 low_tpt = tbl->win[low].average_tpt;
2444         if (high != IWL_RATE_INVALID)
2445                 high_tpt = tbl->win[high].average_tpt;
2446
2447         scale_action = 0;
2448
2449         /* Too many failures, decrease rate */
2450         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2451                 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2452                 scale_action = -1;
2453
2454         /* No throughput measured yet for adjacent rates; try increase. */
2455         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2456                    (high_tpt == IWL_INVALID_VALUE)) {
2457
2458                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2459                         scale_action = 1;
2460                 else if (low != IWL_RATE_INVALID)
2461                         scale_action = 0;
2462         }
2463
2464         /* Both adjacent throughputs are measured, but neither one has better
2465          * throughput; we're using the best rate, don't change it! */
2466         else if ((low_tpt != IWL_INVALID_VALUE) &&
2467                  (high_tpt != IWL_INVALID_VALUE) &&
2468                  (low_tpt < current_tpt) &&
2469                  (high_tpt < current_tpt))
2470                 scale_action = 0;
2471
2472         /* At least one adjacent rate's throughput is measured,
2473          * and may have better performance. */
2474         else {
2475                 /* Higher adjacent rate's throughput is measured */
2476                 if (high_tpt != IWL_INVALID_VALUE) {
2477                         /* Higher rate has better throughput */
2478                         if (high_tpt > current_tpt &&
2479                                         sr >= IWL_RATE_INCREASE_TH) {
2480                                 scale_action = 1;
2481                         } else {
2482                                 scale_action = 0;
2483                         }
2484
2485                 /* Lower adjacent rate's throughput is measured */
2486                 } else if (low_tpt != IWL_INVALID_VALUE) {
2487                         /* Lower rate has better throughput */
2488                         if (low_tpt > current_tpt) {
2489                                 IWL_DEBUG_RATE(priv,
2490                                     "decrease rate because of low tpt\n");
2491                                 scale_action = -1;
2492                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2493                                 scale_action = 1;
2494                         }
2495                 }
2496         }
2497
2498         /* Sanity check; asked for decrease, but success rate or throughput
2499          * has been good at old rate.  Don't change it. */
2500         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2501                     ((sr > IWL_RATE_HIGH_TH) ||
2502                      (current_tpt > (100 * tbl->expected_tpt[low]))))
2503                 scale_action = 0;
2504         if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2505                 scale_action = -1;
2506         if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2507                 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2508                 scale_action = -1;
2509
2510         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2511              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2512                 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2513                         /*
2514                          * don't set scale_action, don't want to scale up if
2515                          * the rate scale doesn't otherwise think that is a
2516                          * good idea.
2517                          */
2518                 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2519                         scale_action = -1;
2520                 }
2521         }
2522         lq_sta->last_bt_traffic = priv->bt_traffic_load;
2523
2524         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2525              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2526                 /* search for a new modulation */
2527                 rs_stay_in_table(lq_sta, true);
2528                 goto lq_update;
2529         }
2530
2531         switch (scale_action) {
2532         case -1:
2533                 /* Decrease starting rate, update uCode's rate table */
2534                 if (low != IWL_RATE_INVALID) {
2535                         update_lq = 1;
2536                         index = low;
2537                 }
2538
2539                 break;
2540         case 1:
2541                 /* Increase starting rate, update uCode's rate table */
2542                 if (high != IWL_RATE_INVALID) {
2543                         update_lq = 1;
2544                         index = high;
2545                 }
2546
2547                 break;
2548         case 0:
2549                 /* No change */
2550         default:
2551                 break;
2552         }
2553
2554         IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2555                     "high %d type %d\n",
2556                      index, scale_action, low, high, tbl->lq_type);
2557
2558 lq_update:
2559         /* Replace uCode's rate table for the destination station. */
2560         if (update_lq)
2561                 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2562
2563         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2564                 /* Should we stay with this modulation mode,
2565                  * or search for a new one? */
2566           rs_stay_in_table(lq_sta, false);
2567         }
2568         /*
2569          * Search for new modulation mode if we're:
2570          * 1)  Not changing rates right now
2571          * 2)  Not just finishing up a search
2572          * 3)  Allowing a new search
2573          */
2574         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2575                 /* Save current throughput to compare with "search" throughput*/
2576                 lq_sta->last_tpt = current_tpt;
2577
2578                 /* Select a new "search" modulation mode to try.
2579                  * If one is found, set up the new "search" table. */
2580                 if (is_legacy(tbl->lq_type))
2581                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2582                 else if (is_siso(tbl->lq_type))
2583                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2584                 else if (is_mimo2(tbl->lq_type))
2585                         rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2586                 else
2587                         rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2588
2589                 /* If new "search" mode was selected, set up in uCode table */
2590                 if (lq_sta->search_better_tbl) {
2591                         /* Access the "search" table, clear its history. */
2592                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2593                         for (i = 0; i < IWL_RATE_COUNT; i++)
2594                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2595
2596                         /* Use new "search" start rate */
2597                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2598
2599                         IWL_DEBUG_RATE(priv, "Switch current  mcs: %X index: %d\n",
2600                                      tbl->current_rate, index);
2601                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2602                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2603                 } else
2604                         done_search = 1;
2605         }
2606
2607         if (done_search && !lq_sta->stay_in_tbl) {
2608                 /* If the "active" (non-search) mode was legacy,
2609                  * and we've tried switching antennas,
2610                  * but we haven't been able to try HT modes (not available),
2611                  * stay with best antenna legacy modulation for a while
2612                  * before next round of mode comparisons. */
2613                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2614                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2615                     lq_sta->action_counter > tbl1->max_search) {
2616                         IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2617                         rs_set_stay_in_table(priv, 1, lq_sta);
2618                 }
2619
2620                 /* If we're in an HT mode, and all 3 mode switch actions
2621                  * have been tried and compared, stay in this best modulation
2622                  * mode for a while before next round of mode comparisons. */
2623                 if (lq_sta->enable_counter &&
2624                     (lq_sta->action_counter >= tbl1->max_search) &&
2625                     iwl_ht_enabled(priv)) {
2626                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2627                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2628                             (tid != IWL_MAX_TID_COUNT)) {
2629                                 u8 sta_id = lq_sta->lq.sta_id;
2630                                 tid_data = &priv->tid_data[sta_id][tid];
2631                                 if (tid_data->agg.state == IWL_AGG_OFF) {
2632                                         IWL_DEBUG_RATE(priv,
2633                                                        "try to aggregate tid %d\n",
2634                                                        tid);
2635                                         rs_tl_turn_on_agg(priv, tid,
2636                                                           lq_sta, sta);
2637                                 }
2638                         }
2639                         rs_set_stay_in_table(priv, 0, lq_sta);
2640                 }
2641         }
2642
2643 out:
2644         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2645         lq_sta->last_txrate_idx = index;
2646 }
2647
2648 /**
2649  * rs_initialize_lq - Initialize a station's hardware rate table
2650  *
2651  * The uCode's station table contains a table of fallback rates
2652  * for automatic fallback during transmission.
2653  *
2654  * NOTE: This sets up a default set of values.  These will be replaced later
2655  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2656  *       rc80211_simple.
2657  *
2658  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2659  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2660  *       which requires station table entry to exist).
2661  */
2662 static void rs_initialize_lq(struct iwl_priv *priv,
2663                              struct ieee80211_sta *sta,
2664                              struct iwl_lq_sta *lq_sta)
2665 {
2666         struct iwl_scale_tbl_info *tbl;
2667         int rate_idx;
2668         int i;
2669         u32 rate;
2670         u8 use_green = rs_use_green(sta);
2671         u8 active_tbl = 0;
2672         u8 valid_tx_ant;
2673         struct iwl_station_priv *sta_priv;
2674         struct iwl_rxon_context *ctx;
2675
2676         if (!sta || !lq_sta)
2677                 return;
2678
2679         sta_priv = (void *)sta->drv_priv;
2680         ctx = sta_priv->ctx;
2681
2682         i = lq_sta->last_txrate_idx;
2683
2684         valid_tx_ant = priv->nvm_data->valid_tx_ant;
2685
2686         if (!lq_sta->search_better_tbl)
2687                 active_tbl = lq_sta->active_tbl;
2688         else
2689                 active_tbl = 1 - lq_sta->active_tbl;
2690
2691         tbl = &(lq_sta->lq_info[active_tbl]);
2692
2693         if ((i < 0) || (i >= IWL_RATE_COUNT))
2694                 i = 0;
2695
2696         rate = iwl_rates[i].plcp;
2697         tbl->ant_type = first_antenna(valid_tx_ant);
2698         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2699
2700         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2701                 rate |= RATE_MCS_CCK_MSK;
2702
2703         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2704         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2705             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2706
2707         rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2708         tbl->current_rate = rate;
2709         rs_set_expected_tpt_table(lq_sta, tbl);
2710         rs_fill_link_cmd(NULL, lq_sta, rate);
2711         priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2712         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, 0, true);
2713 }
2714
2715 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2716                         struct ieee80211_tx_rate_control *txrc)
2717 {
2718
2719         struct sk_buff *skb = txrc->skb;
2720         struct ieee80211_supported_band *sband = txrc->sband;
2721         struct iwl_op_mode *op_mode __maybe_unused =
2722                         (struct iwl_op_mode *)priv_r;
2723         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2724         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2725         struct iwl_lq_sta *lq_sta = priv_sta;
2726         int rate_idx;
2727
2728         IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2729
2730         /* Get max rate if user set max rate */
2731         if (lq_sta) {
2732                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2733                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2734                     (lq_sta->max_rate_idx != -1))
2735                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2736                 if ((lq_sta->max_rate_idx < 0) ||
2737                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2738                         lq_sta->max_rate_idx = -1;
2739         }
2740
2741         /* Treat uninitialized rate scaling data same as non-existing. */
2742         if (lq_sta && !lq_sta->drv) {
2743                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2744                 priv_sta = NULL;
2745         }
2746
2747         /* Send management frames and NO_ACK data using lowest rate. */
2748         if (rate_control_send_low(sta, priv_sta, txrc))
2749                 return;
2750
2751         rate_idx  = lq_sta->last_txrate_idx;
2752
2753         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2754                 rate_idx -= IWL_FIRST_OFDM_RATE;
2755                 /* 6M and 9M shared same MCS index */
2756                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2757                 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2758                     IWL_RATE_MIMO3_6M_PLCP)
2759                         rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2760                 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2761                          IWL_RATE_MIMO2_6M_PLCP)
2762                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2763                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2764                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2765                         info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2766                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2767                         info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2768                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2769                         info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2770                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2771                         info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2772         } else {
2773                 /* Check for invalid rates */
2774                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2775                                 ((sband->band == IEEE80211_BAND_5GHZ) &&
2776                                  (rate_idx < IWL_FIRST_OFDM_RATE)))
2777                         rate_idx = rate_lowest_index(sband, sta);
2778                 /* On valid 5 GHz rate, adjust index */
2779                 else if (sband->band == IEEE80211_BAND_5GHZ)
2780                         rate_idx -= IWL_FIRST_OFDM_RATE;
2781                 info->control.rates[0].flags = 0;
2782         }
2783         info->control.rates[0].idx = rate_idx;
2784         info->control.rates[0].count = 1;
2785 }
2786
2787 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2788                           gfp_t gfp)
2789 {
2790         struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2791         struct iwl_op_mode *op_mode __maybe_unused =
2792                         (struct iwl_op_mode *)priv_rate;
2793         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2794
2795         IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2796
2797         return &sta_priv->lq_sta;
2798 }
2799
2800 /*
2801  * Called after adding a new station to initialize rate scaling
2802  */
2803 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2804 {
2805         int i, j;
2806         struct ieee80211_hw *hw = priv->hw;
2807         struct ieee80211_conf *conf = &priv->hw->conf;
2808         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2809         struct iwl_station_priv *sta_priv;
2810         struct iwl_lq_sta *lq_sta;
2811         struct ieee80211_supported_band *sband;
2812         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2813
2814         sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2815         lq_sta = &sta_priv->lq_sta;
2816         sband = hw->wiphy->bands[conf->chandef.chan->band];
2817
2818
2819         lq_sta->lq.sta_id = sta_id;
2820
2821         for (j = 0; j < LQ_SIZE; j++)
2822                 for (i = 0; i < IWL_RATE_COUNT; i++)
2823                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2824
2825         lq_sta->flush_timer = 0;
2826         lq_sta->supp_rates = sta->supp_rates[sband->band];
2827
2828         IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2829                        sta_id);
2830         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2831          * the lowest or the highest rate.. Could consider using RSSI from
2832          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2833          * after assoc.. */
2834
2835         lq_sta->is_dup = 0;
2836         lq_sta->max_rate_idx = -1;
2837         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2838         lq_sta->is_green = rs_use_green(sta);
2839         lq_sta->band = sband->band;
2840         /*
2841          * active legacy rates as per supported rates bitmap
2842          */
2843         supp = sta->supp_rates[sband->band];
2844         lq_sta->active_legacy_rate = 0;
2845         for_each_set_bit(i, &supp, BITS_PER_LONG)
2846                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2847
2848         /*
2849          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2850          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2851          */
2852         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2853         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2854         lq_sta->active_siso_rate &= ~((u16)0x2);
2855         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2856
2857         /* Same here */
2858         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2859         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2860         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2861         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2862
2863         lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2864         lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2865         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2866         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2867
2868         IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2869                      lq_sta->active_siso_rate,
2870                      lq_sta->active_mimo2_rate,
2871                      lq_sta->active_mimo3_rate);
2872
2873         /* These values will be overridden later */
2874         lq_sta->lq.general_params.single_stream_ant_msk =
2875                 first_antenna(priv->nvm_data->valid_tx_ant);
2876         lq_sta->lq.general_params.dual_stream_ant_msk =
2877                 priv->nvm_data->valid_tx_ant &
2878                 ~first_antenna(priv->nvm_data->valid_tx_ant);
2879         if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2880                 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2881         } else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) {
2882                 lq_sta->lq.general_params.dual_stream_ant_msk =
2883                         priv->nvm_data->valid_tx_ant;
2884         }
2885
2886         /* as default allow aggregation for all tids */
2887         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2888         lq_sta->drv = priv;
2889
2890         /* Set last_txrate_idx to lowest rate */
2891         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2892         if (sband->band == IEEE80211_BAND_5GHZ)
2893                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2894         lq_sta->is_agg = 0;
2895 #ifdef CONFIG_MAC80211_DEBUGFS
2896         lq_sta->dbg_fixed_rate = 0;
2897 #endif
2898
2899         rs_initialize_lq(priv, sta, lq_sta);
2900 }
2901
2902 static void rs_fill_link_cmd(struct iwl_priv *priv,
2903                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2904 {
2905         struct iwl_scale_tbl_info tbl_type;
2906         int index = 0;
2907         int rate_idx;
2908         int repeat_rate = 0;
2909         u8 ant_toggle_cnt = 0;
2910         u8 use_ht_possible = 1;
2911         u8 valid_tx_ant = 0;
2912         struct iwl_station_priv *sta_priv =
2913                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2914         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2915
2916         /* Override starting rate (index 0) if needed for debug purposes */
2917         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2918
2919         /* Interpret new_rate (rate_n_flags) */
2920         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2921                                   &tbl_type, &rate_idx);
2922
2923         if (priv && priv->bt_full_concurrent) {
2924                 /* 1x1 only */
2925                 tbl_type.ant_type =
2926                         first_antenna(priv->nvm_data->valid_tx_ant);
2927         }
2928
2929         /* How many times should we repeat the initial rate? */
2930         if (is_legacy(tbl_type.lq_type)) {
2931                 ant_toggle_cnt = 1;
2932                 repeat_rate = IWL_NUMBER_TRY;
2933         } else {
2934                 repeat_rate = min(IWL_HT_NUMBER_TRY,
2935                                   LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2936         }
2937
2938         lq_cmd->general_params.mimo_delimiter =
2939                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2940
2941         /* Fill 1st table entry (index 0) */
2942         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2943
2944         if (num_of_ant(tbl_type.ant_type) == 1) {
2945                 lq_cmd->general_params.single_stream_ant_msk =
2946                                                 tbl_type.ant_type;
2947         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2948                 lq_cmd->general_params.dual_stream_ant_msk =
2949                                                 tbl_type.ant_type;
2950         } /* otherwise we don't modify the existing value */
2951
2952         index++;
2953         repeat_rate--;
2954         if (priv) {
2955                 if (priv->bt_full_concurrent)
2956                         valid_tx_ant = ANT_A;
2957                 else
2958                         valid_tx_ant = priv->nvm_data->valid_tx_ant;
2959         }
2960
2961         /* Fill rest of rate table */
2962         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2963                 /* Repeat initial/next rate.
2964                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2965                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2966                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2967                         if (is_legacy(tbl_type.lq_type)) {
2968                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2969                                         ant_toggle_cnt++;
2970                                 else if (priv &&
2971                                          rs_toggle_antenna(valid_tx_ant,
2972                                                         &new_rate, &tbl_type))
2973                                         ant_toggle_cnt = 1;
2974                         }
2975
2976                         /* Override next rate if needed for debug purposes */
2977                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2978
2979                         /* Fill next table entry */
2980                         lq_cmd->rs_table[index].rate_n_flags =
2981                                         cpu_to_le32(new_rate);
2982                         repeat_rate--;
2983                         index++;
2984                 }
2985
2986                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2987                                                 &rate_idx);
2988
2989                 if (priv && priv->bt_full_concurrent) {
2990                         /* 1x1 only */
2991                         tbl_type.ant_type =
2992                             first_antenna(priv->nvm_data->valid_tx_ant);
2993                 }
2994
2995                 /* Indicate to uCode which entries might be MIMO.
2996                  * If initial rate was MIMO, this will finally end up
2997                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2998                 if (is_mimo(tbl_type.lq_type))
2999                         lq_cmd->general_params.mimo_delimiter = index;
3000
3001                 /* Get next rate */
3002                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3003                                              use_ht_possible);
3004
3005                 /* How many times should we repeat the next rate? */
3006                 if (is_legacy(tbl_type.lq_type)) {
3007                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3008                                 ant_toggle_cnt++;
3009                         else if (priv &&
3010                                  rs_toggle_antenna(valid_tx_ant,
3011                                                    &new_rate, &tbl_type))
3012                                 ant_toggle_cnt = 1;
3013
3014                         repeat_rate = IWL_NUMBER_TRY;
3015                 } else {
3016                         repeat_rate = IWL_HT_NUMBER_TRY;
3017                 }
3018
3019                 /* Don't allow HT rates after next pass.
3020                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3021                 use_ht_possible = 0;
3022
3023                 /* Override next rate if needed for debug purposes */
3024                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3025
3026                 /* Fill next table entry */
3027                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3028
3029                 index++;
3030                 repeat_rate--;
3031         }
3032
3033         lq_cmd->agg_params.agg_frame_cnt_limit =
3034                 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3035         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3036
3037         lq_cmd->agg_params.agg_time_limit =
3038                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3039         /*
3040          * overwrite if needed, pass aggregation time limit
3041          * to uCode in uSec
3042          */
3043         if (priv && priv->lib->bt_params &&
3044             priv->lib->bt_params->agg_time_limit &&
3045             priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3046                 lq_cmd->agg_params.agg_time_limit =
3047                         cpu_to_le16(priv->lib->bt_params->agg_time_limit);
3048 }
3049
3050 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3051 {
3052         return hw->priv;
3053 }
3054 /* rate scale requires free function to be implemented */
3055 static void rs_free(void *priv_rate)
3056 {
3057         return;
3058 }
3059
3060 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3061                         void *priv_sta)
3062 {
3063         struct iwl_op_mode *op_mode __maybe_unused = priv_r;
3064         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
3065
3066         IWL_DEBUG_RATE(priv, "enter\n");
3067         IWL_DEBUG_RATE(priv, "leave\n");
3068 }
3069
3070 #ifdef CONFIG_MAC80211_DEBUGFS
3071 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3072                              u32 *rate_n_flags, int index)
3073 {
3074         struct iwl_priv *priv;
3075         u8 valid_tx_ant;
3076         u8 ant_sel_tx;
3077
3078         priv = lq_sta->drv;
3079         valid_tx_ant = priv->nvm_data->valid_tx_ant;
3080         if (lq_sta->dbg_fixed_rate) {
3081                 ant_sel_tx =
3082                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3083                   >> RATE_MCS_ANT_POS);
3084                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3085                         *rate_n_flags = lq_sta->dbg_fixed_rate;
3086                         IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3087                 } else {
3088                         lq_sta->dbg_fixed_rate = 0;
3089                         IWL_ERR(priv,
3090                             "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3091                             ant_sel_tx, valid_tx_ant);
3092                         IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3093                 }
3094         } else {
3095                 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3096         }
3097 }
3098
3099 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3100                         const char __user *user_buf, size_t count, loff_t *ppos)
3101 {
3102         struct iwl_lq_sta *lq_sta = file->private_data;
3103         struct iwl_priv *priv;
3104         char buf[64];
3105         size_t buf_size;
3106         u32 parsed_rate;
3107
3108
3109         priv = lq_sta->drv;
3110         memset(buf, 0, sizeof(buf));
3111         buf_size = min(count, sizeof(buf) -  1);
3112         if (copy_from_user(buf, user_buf, buf_size))
3113                 return -EFAULT;
3114
3115         if (sscanf(buf, "%x", &parsed_rate) == 1)
3116                 lq_sta->dbg_fixed_rate = parsed_rate;
3117         else
3118                 lq_sta->dbg_fixed_rate = 0;
3119
3120         rs_program_fix_rate(priv, lq_sta);
3121
3122         return count;
3123 }
3124
3125 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3126                         char __user *user_buf, size_t count, loff_t *ppos)
3127 {
3128         char *buff;
3129         int desc = 0;
3130         int i = 0;
3131         int index = 0;
3132         ssize_t ret;
3133
3134         struct iwl_lq_sta *lq_sta = file->private_data;
3135         struct iwl_priv *priv;
3136         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3137
3138         priv = lq_sta->drv;
3139         buff = kmalloc(1024, GFP_KERNEL);
3140         if (!buff)
3141                 return -ENOMEM;
3142
3143         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3144         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3145                         lq_sta->total_failed, lq_sta->total_success,
3146                         lq_sta->active_legacy_rate);
3147         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3148                         lq_sta->dbg_fixed_rate);
3149         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3150             (priv->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3151             (priv->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3152             (priv->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3153         desc += sprintf(buff+desc, "lq type %s\n",
3154            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3155         if (is_Ht(tbl->lq_type)) {
3156                 desc += sprintf(buff + desc, " %s",
3157                    (is_siso(tbl->lq_type)) ? "SISO" :
3158                    ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3159                 desc += sprintf(buff + desc, " %s",
3160                    (tbl->is_ht40) ? "40MHz" : "20MHz");
3161                 desc += sprintf(buff + desc, " %s %s %s\n",
3162                    (tbl->is_SGI) ? "SGI" : "",
3163                    (lq_sta->is_green) ? "GF enabled" : "",
3164                    (lq_sta->is_agg) ? "AGG on" : "");
3165         }
3166         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3167                 lq_sta->last_rate_n_flags);
3168         desc += sprintf(buff+desc, "general:"
3169                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3170                 lq_sta->lq.general_params.flags,
3171                 lq_sta->lq.general_params.mimo_delimiter,
3172                 lq_sta->lq.general_params.single_stream_ant_msk,
3173                 lq_sta->lq.general_params.dual_stream_ant_msk);
3174
3175         desc += sprintf(buff+desc, "agg:"
3176                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3177                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3178                         lq_sta->lq.agg_params.agg_dis_start_th,
3179                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
3180
3181         desc += sprintf(buff+desc,
3182                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3183                         lq_sta->lq.general_params.start_rate_index[0],
3184                         lq_sta->lq.general_params.start_rate_index[1],
3185                         lq_sta->lq.general_params.start_rate_index[2],
3186                         lq_sta->lq.general_params.start_rate_index[3]);
3187
3188         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3189                 index = iwl_hwrate_to_plcp_idx(
3190                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3191                 if (is_legacy(tbl->lq_type)) {
3192                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3193                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3194                                 iwl_rate_mcs[index].mbps);
3195                 } else {
3196                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3197                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3198                                 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3199                 }
3200         }
3201
3202         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3203         kfree(buff);
3204         return ret;
3205 }
3206
3207 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3208         .write = rs_sta_dbgfs_scale_table_write,
3209         .read = rs_sta_dbgfs_scale_table_read,
3210         .open = simple_open,
3211         .llseek = default_llseek,
3212 };
3213 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3214                         char __user *user_buf, size_t count, loff_t *ppos)
3215 {
3216         char *buff;
3217         int desc = 0;
3218         int i, j;
3219         ssize_t ret;
3220
3221         struct iwl_lq_sta *lq_sta = file->private_data;
3222
3223         buff = kmalloc(1024, GFP_KERNEL);
3224         if (!buff)
3225                 return -ENOMEM;
3226
3227         for (i = 0; i < LQ_SIZE; i++) {
3228                 desc += sprintf(buff+desc,
3229                                 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3230                                 "rate=0x%X\n",
3231                                 lq_sta->active_tbl == i ? "*" : "x",
3232                                 lq_sta->lq_info[i].lq_type,
3233                                 lq_sta->lq_info[i].is_SGI,
3234                                 lq_sta->lq_info[i].is_ht40,
3235                                 lq_sta->lq_info[i].is_dup,
3236                                 lq_sta->is_green,
3237                                 lq_sta->lq_info[i].current_rate);
3238                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3239                         desc += sprintf(buff+desc,
3240                                 "counter=%d success=%d %%=%d\n",
3241                                 lq_sta->lq_info[i].win[j].counter,
3242                                 lq_sta->lq_info[i].win[j].success_counter,
3243                                 lq_sta->lq_info[i].win[j].success_ratio);
3244                 }
3245         }
3246         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3247         kfree(buff);
3248         return ret;
3249 }
3250
3251 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3252         .read = rs_sta_dbgfs_stats_table_read,
3253         .open = simple_open,
3254         .llseek = default_llseek,
3255 };
3256
3257 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3258                         char __user *user_buf, size_t count, loff_t *ppos)
3259 {
3260         struct iwl_lq_sta *lq_sta = file->private_data;
3261         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3262         char buff[120];
3263         int desc = 0;
3264
3265         if (is_Ht(tbl->lq_type))
3266                 desc += sprintf(buff+desc,
3267                                 "Bit Rate= %d Mb/s\n",
3268                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3269         else
3270                 desc += sprintf(buff+desc,
3271                                 "Bit Rate= %d Mb/s\n",
3272                                 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3273
3274         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3275 }
3276
3277 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3278         .read = rs_sta_dbgfs_rate_scale_data_read,
3279         .open = simple_open,
3280         .llseek = default_llseek,
3281 };
3282
3283 static void rs_add_debugfs(void *priv, void *priv_sta,
3284                                         struct dentry *dir)
3285 {
3286         struct iwl_lq_sta *lq_sta = priv_sta;
3287         lq_sta->rs_sta_dbgfs_scale_table_file =
3288                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3289                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3290         lq_sta->rs_sta_dbgfs_stats_table_file =
3291                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3292                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
3293         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3294                 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3295                         lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3296         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3297                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3298                 &lq_sta->tx_agg_tid_en);
3299
3300 }
3301
3302 static void rs_remove_debugfs(void *priv, void *priv_sta)
3303 {
3304         struct iwl_lq_sta *lq_sta = priv_sta;
3305         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3306         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3307         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3308         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3309 }
3310 #endif
3311
3312 /*
3313  * Initialization of rate scaling information is done by driver after
3314  * the station is added. Since mac80211 calls this function before a
3315  * station is added we ignore it.
3316  */
3317 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3318                               struct cfg80211_chan_def *chandef,
3319                               struct ieee80211_sta *sta, void *priv_sta)
3320 {
3321 }
3322
3323 static const struct rate_control_ops rs_ops = {
3324         .name = RS_NAME,
3325         .tx_status = rs_tx_status,
3326         .get_rate = rs_get_rate,
3327         .rate_init = rs_rate_init_stub,
3328         .alloc = rs_alloc,
3329         .free = rs_free,
3330         .alloc_sta = rs_alloc_sta,
3331         .free_sta = rs_free_sta,
3332 #ifdef CONFIG_MAC80211_DEBUGFS
3333         .add_sta_debugfs = rs_add_debugfs,
3334         .remove_sta_debugfs = rs_remove_debugfs,
3335 #endif
3336 };
3337
3338 int iwlagn_rate_control_register(void)
3339 {
3340         return ieee80211_rate_control_register(&rs_ops);
3341 }
3342
3343 void iwlagn_rate_control_unregister(void)
3344 {
3345         ieee80211_rate_control_unregister(&rs_ops);
3346 }
3347