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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/slab.h>
  30 #include <linux/wireless.h>
  31 #include <net/mac80211.h>
  32
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/delay.h>
  36
  37 #include <linux/workqueue.h>
  38
  39 #include "iwl-dev.h"
  40 #include "iwl-sta.h"
  41 #include "iwl-core.h"
  42 #include "iwl-agn.h"
  43
  44 #define RS_NAME "iwl-agn-rs"
  45
  46 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  47 #define IWL_NUMBER_TRY      1
  48 #define IWL_HT_NUMBER_TRY   3
  49
  50 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  51 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  52 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  53
  54 /* max allowed rate miss before sync LQ cmd */
  55 #define IWL_MISSED_RATE_MAX             15
  56 /* max time to accum history 2 seconds */
  57 #define IWL_RATE_SCALE_FLUSH_INTVL   (3*HZ)
  58
  59 static u8 rs_ht_to_legacy[] = {
  60         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  61         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  62         IWL_RATE_6M_INDEX,
  63         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  64         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  65         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  66         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  67 };
  68
  69 static const u8 ant_toggle_lookup[] = {
  70         /*ANT_NONE -> */ ANT_NONE,
  71         /*ANT_A    -> */ ANT_B,
  72         /*ANT_B    -> */ ANT_C,
  73         /*ANT_AB   -> */ ANT_BC,
  74         /*ANT_C    -> */ ANT_A,
  75         /*ANT_AC   -> */ ANT_AB,
  76         /*ANT_BC   -> */ ANT_AC,
  77         /*ANT_ABC  -> */ ANT_ABC,
  78 };
  79
  80 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
  81         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
  82                                     IWL_RATE_SISO_##s##M_PLCP, \
  83                                     IWL_RATE_MIMO2_##s##M_PLCP,\
  84                                     IWL_RATE_MIMO3_##s##M_PLCP,\
  85                                     IWL_RATE_##r##M_IEEE,      \
  86                                     IWL_RATE_##ip##M_INDEX,    \
  87                                     IWL_RATE_##in##M_INDEX,    \
  88                                     IWL_RATE_##rp##M_INDEX,    \
  89                                     IWL_RATE_##rn##M_INDEX,    \
  90                                     IWL_RATE_##pp##M_INDEX,    \
  91                                     IWL_RATE_##np##M_INDEX }
  92
  93 /*
  94  * Parameter order:
  95  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
  96  *
  97  * If there isn't a valid next or previous rate then INV is used which
  98  * maps to IWL_RATE_INVALID
  99  *
 100  */
 101 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
 102         IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),    /*  1mbps */
 103         IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
 104         IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
 105         IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
 106         IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
 107         IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
 108         IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
 109         IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
 110         IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
 111         IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
 112         IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
 113         IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
 114         IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
 115         /* FIXME:RS:          ^^    should be INV (legacy) */
 116 };
 117
 118 static inline u8 rs_extract_rate(u32 rate_n_flags)
 119 {
 120         return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
 121 }
 122
 123 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 124 {
 125         int idx = 0;
 126
 127         /* HT rate format */
 128         if (rate_n_flags & RATE_MCS_HT_MSK) {
 129                 idx = rs_extract_rate(rate_n_flags);
 130
 131                 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
 132                         idx = idx - IWL_RATE_MIMO3_6M_PLCP;
 133                 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
 134                         idx = idx - IWL_RATE_MIMO2_6M_PLCP;
 135
 136                 idx += IWL_FIRST_OFDM_RATE;
 137                 /* skip 9M not supported in ht*/
 138                 if (idx >= IWL_RATE_9M_INDEX)
 139                         idx += 1;
 140                 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
 141                         return idx;
 142
 143         /* legacy rate format, search for match in table */
 144         } else {
 145                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 146                         if (iwl_rates[idx].plcp ==
 147                                         rs_extract_rate(rate_n_flags))
 148                                 return idx;
 149         }
 150
 151         return -1;
 152 }
 153
 154 static void rs_rate_scale_perform(struct iwl_priv *priv,
 155                                    struct sk_buff *skb,
 156                                    struct ieee80211_sta *sta,
 157                                    struct iwl_lq_sta *lq_sta);
 158 static void rs_fill_link_cmd(struct iwl_priv *priv,
 159                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 160 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 161
 162
 163 #ifdef CONFIG_MAC80211_DEBUGFS
 164 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 165                              u32 *rate_n_flags, int index);
 166 #else
 167 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 168                              u32 *rate_n_flags, int index)
 169 {}
 170 #endif
 171
 172 /**
 173  * The following tables contain the expected throughput metrics for all rates
 174  *
 175  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 176  *
 177  * where invalid entries are zeros.
 178  *
 179  * CCK rates are only valid in legacy table and will only be used in G
 180  * (2.4 GHz) band.
 181  */
 182
 183 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
 184         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 185 };
 186
 187 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
 188         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202}, /* Norm */
 189         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210}, /* SGI */
 190         {0, 0, 0, 0, 47, 0,  91, 133, 171, 242, 305, 334, 362}, /* AGG */
 191         {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
 192 };
 193
 194 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
 195         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 196         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 197         {0, 0, 0, 0,  94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
 198         {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
 199 };
 200
 201 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 202         {0, 0, 0, 0,  74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
 203         {0, 0, 0, 0,  81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
 204         {0, 0, 0, 0,  89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
 205         {0, 0, 0, 0,  97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
 206 };
 207
 208 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 209         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
 210         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
 211         {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
 212         {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
 213 };
 214
 215 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
 216         {0, 0, 0, 0,  99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
 217         {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
 218         {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
 219         {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
 220 };
 221
 222 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
 223         {0, 0, 0, 0, 152, 0, 211, 239, 255, 279,  290,  294,  297}, /* Norm */
 224         {0, 0, 0, 0, 160, 0, 219, 245, 261, 284,  294,  297,  300}, /* SGI */
 225         {0, 0, 0, 0, 254, 0, 443, 584, 695, 868,  984, 1030, 1070}, /* AGG */
 226         {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
 227 };
 228
 229 /* mbps, mcs */
 230 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 231         {  "1", "BPSK DSSS"},
 232         {  "2", "QPSK DSSS"},
 233         {"5.5", "BPSK CCK"},
 234         { "11", "QPSK CCK"},
 235         {  "6", "BPSK 1/2"},
 236         {  "9", "BPSK 1/2"},
 237         { "12", "QPSK 1/2"},
 238         { "18", "QPSK 3/4"},
 239         { "24", "16QAM 1/2"},
 240         { "36", "16QAM 3/4"},
 241         { "48", "64QAM 2/3"},
 242         { "54", "64QAM 3/4"},
 243         { "60", "64QAM 5/6"},
 244 };
 245
 246 #define MCS_INDEX_PER_STREAM    (8)
 247
 248 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 249 {
 250         window->data = 0;
 251         window->success_counter = 0;
 252         window->success_ratio = IWL_INVALID_VALUE;
 253         window->counter = 0;
 254         window->average_tpt = IWL_INVALID_VALUE;
 255         window->stamp = 0;
 256 }
 257
 258 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 259 {
 260         return (ant_type & valid_antenna) == ant_type;
 261 }
 262
 263 /*
 264  *      removes the old data from the statistics. All data that is older than
 265  *      TID_MAX_TIME_DIFF, will be deleted.
 266  */
 267 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 268 {
 269         /* The oldest age we want to keep */
 270         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 271
 272         while (tl->queue_count &&
 273                (tl->time_stamp < oldest_time)) {
 274                 tl->total -= tl->packet_count[tl->head];
 275                 tl->packet_count[tl->head] = 0;
 276                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 277                 tl->queue_count--;
 278                 tl->head++;
 279                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 280                         tl->head = 0;
 281         }
 282 }
 283
 284 /*
 285  *      increment traffic load value for tid and also remove
 286  *      any old values if passed the certain time period
 287  */
 288 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 289                            struct ieee80211_hdr *hdr)
 290 {
 291         u32 curr_time = jiffies_to_msecs(jiffies);
 292         u32 time_diff;
 293         s32 index;
 294         struct iwl_traffic_load *tl = NULL;
 295         u8 tid;
 296
 297         if (ieee80211_is_data_qos(hdr->frame_control)) {
 298                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 299                 tid = qc[0] & 0xf;
 300         } else
 301                 return MAX_TID_COUNT;
 302
 303         if (unlikely(tid >= TID_MAX_LOAD_COUNT))
 304                 return MAX_TID_COUNT;
 305
 306         tl = &lq_data->load[tid];
 307
 308         curr_time -= curr_time % TID_ROUND_VALUE;
 309
 310         /* Happens only for the first packet. Initialize the data */
 311         if (!(tl->queue_count)) {
 312                 tl->total = 1;
 313                 tl->time_stamp = curr_time;
 314                 tl->queue_count = 1;
 315                 tl->head = 0;
 316                 tl->packet_count[0] = 1;
 317                 return MAX_TID_COUNT;
 318         }
 319
 320         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 321         index = time_diff / TID_QUEUE_CELL_SPACING;
 322
 323         /* The history is too long: remove data that is older than */
 324         /* TID_MAX_TIME_DIFF */
 325         if (index >= TID_QUEUE_MAX_SIZE)
 326                 rs_tl_rm_old_stats(tl, curr_time);
 327
 328         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 329         tl->packet_count[index] = tl->packet_count[index] + 1;
 330         tl->total = tl->total + 1;
 331
 332         if ((index + 1) > tl->queue_count)
 333                 tl->queue_count = index + 1;
 334
 335         return tid;
 336 }
 337
 338 #ifdef CONFIG_MAC80211_DEBUGFS
 339 /**
 340  * Program the device to use fixed rate for frame transmit
 341  * This is for debugging/testing only
 342  * once the device start use fixed rate, we need to reload the module
 343  * to being back the normal operation.
 344  */
 345 static void rs_program_fix_rate(struct iwl_priv *priv,
 346                                 struct iwl_lq_sta *lq_sta)
 347 {
 348         struct iwl_station_priv *sta_priv =
 349                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
 350         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
 351
 352         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
 353         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 354         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 355         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 356
 357         /* testmode has higher priority to overwirte the fixed rate */
 358         if (priv->tm_fixed_rate)
 359                 lq_sta->dbg_fixed_rate = priv->tm_fixed_rate;
 360
 361         IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
 362                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
 363
 364         if (lq_sta->dbg_fixed_rate) {
 365                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
 366                 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
 367                                 false);
 368         }
 369 }
 370 #endif
 371
 372 /*
 373         get the traffic load value for tid
 374 */
 375 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 376 {
 377         u32 curr_time = jiffies_to_msecs(jiffies);
 378         u32 time_diff;
 379         s32 index;
 380         struct iwl_traffic_load *tl = NULL;
 381
 382         if (tid >= TID_MAX_LOAD_COUNT)
 383                 return 0;
 384
 385         tl = &(lq_data->load[tid]);
 386
 387         curr_time -= curr_time % TID_ROUND_VALUE;
 388
 389         if (!(tl->queue_count))
 390                 return 0;
 391
 392         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 393         index = time_diff / TID_QUEUE_CELL_SPACING;
 394
 395         /* The history is too long: remove data that is older than */
 396         /* TID_MAX_TIME_DIFF */
 397         if (index >= TID_QUEUE_MAX_SIZE)
 398                 rs_tl_rm_old_stats(tl, curr_time);
 399
 400         return tl->total;
 401 }
 402
 403 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 404                                       struct iwl_lq_sta *lq_data, u8 tid,
 405                                       struct ieee80211_sta *sta)
 406 {
 407         int ret = -EAGAIN;
 408         u32 load;
 409
 410         /*
 411          * Don't create TX aggregation sessions when in high
 412          * BT traffic, as they would just be disrupted by BT.
 413          */
 414         if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
 415                 IWL_ERR(priv, "BT traffic (%d), no aggregation allowed\n",
 416                         priv->bt_traffic_load);
 417                 return ret;
 418         }
 419
 420         load = rs_tl_get_load(lq_data, tid);
 421
 422         if (load > IWL_AGG_LOAD_THRESHOLD) {
 423                 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
 424                                 sta->addr, tid);
 425                 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 426                 if (ret == -EAGAIN) {
 427                         /*
 428                          * driver and mac80211 is out of sync
 429                          * this might be cause by reloading firmware
 430                          * stop the tx ba session here
 431                          */
 432                         IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
 433                                 tid);
 434                         ieee80211_stop_tx_ba_session(sta, tid);
 435                 }
 436         } else {
 437                 IWL_DEBUG_HT(priv, "Aggregation not enabled for tid %d "
 438                         "because load = %u\n", tid, load);
 439         }
 440         return ret;
 441 }
 442
 443 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 444                               struct iwl_lq_sta *lq_data,
 445                               struct ieee80211_sta *sta)
 446 {
 447         if (tid < TID_MAX_LOAD_COUNT)
 448                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 449         else
 450                 IWL_ERR(priv, "tid exceeds max load count: %d/%d\n",
 451                         tid, TID_MAX_LOAD_COUNT);
 452 }
 453
 454 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 455 {
 456         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 457                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 458                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 459 }
 460
 461 /*
 462  * Static function to get the expected throughput from an iwl_scale_tbl_info
 463  * that wraps a NULL pointer check
 464  */
 465 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 466 {
 467         if (tbl->expected_tpt)
 468                 return tbl->expected_tpt[rs_index];
 469         return 0;
 470 }
 471
 472 /**
 473  * rs_collect_tx_data - Update the success/failure sliding window
 474  *
 475  * We keep a sliding window of the last 62 packets transmitted
 476  * at this rate.  window->data contains the bitmask of successful
 477  * packets.
 478  */
 479 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 480                               int scale_index, int attempts, int successes)
 481 {
 482         struct iwl_rate_scale_data *window = NULL;
 483         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 484         s32 fail_count, tpt;
 485
 486         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 487                 return -EINVAL;
 488
 489         /* Select window for current tx bit rate */
 490         window = &(tbl->win[scale_index]);
 491
 492         /* Get expected throughput */
 493         tpt = get_expected_tpt(tbl, scale_index);
 494
 495         /*
 496          * Keep track of only the latest 62 tx frame attempts in this rate's
 497          * history window; anything older isn't really relevant any more.
 498          * If we have filled up the sliding window, drop the oldest attempt;
 499          * if the oldest attempt (highest bit in bitmap) shows "success",
 500          * subtract "1" from the success counter (this is the main reason
 501          * we keep these bitmaps!).
 502          */
 503         while (attempts > 0) {
 504                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 505
 506                         /* remove earliest */
 507                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 508
 509                         if (window->data & mask) {
 510                                 window->data &= ~mask;
 511                                 window->success_counter--;
 512                         }
 513                 }
 514
 515                 /* Increment frames-attempted counter */
 516                 window->counter++;
 517
 518                 /* Shift bitmap by one frame to throw away oldest history */
 519                 window->data <<= 1;
 520
 521                 /* Mark the most recent #successes attempts as successful */
 522                 if (successes > 0) {
 523                         window->success_counter++;
 524                         window->data |= 0x1;
 525                         successes--;
 526                 }
 527
 528                 attempts--;
 529         }
 530
 531         /* Calculate current success ratio, avoid divide-by-0! */
 532         if (window->counter > 0)
 533                 window->success_ratio = 128 * (100 * window->success_counter)
 534                                         / window->counter;
 535         else
 536                 window->success_ratio = IWL_INVALID_VALUE;
 537
 538         fail_count = window->counter - window->success_counter;
 539
 540         /* Calculate average throughput, if we have enough history. */
 541         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 542             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 543                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 544         else
 545                 window->average_tpt = IWL_INVALID_VALUE;
 546
 547         /* Tag this window as having been updated */
 548         window->stamp = jiffies;
 549
 550         return 0;
 551 }
 552
 553 /*
 554  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 555  */
 556 /* FIXME:RS:remove this function and put the flags statically in the table */
 557 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
 558                                  struct iwl_scale_tbl_info *tbl,
 559                                  int index, u8 use_green)
 560 {
 561         u32 rate_n_flags = 0;
 562
 563         if (is_legacy(tbl->lq_type)) {
 564                 rate_n_flags = iwl_rates[index].plcp;
 565                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 566                         rate_n_flags |= RATE_MCS_CCK_MSK;
 567
 568         } else if (is_Ht(tbl->lq_type)) {
 569                 if (index > IWL_LAST_OFDM_RATE) {
 570                         IWL_ERR(priv, "Invalid HT rate index %d\n", index);
 571                         index = IWL_LAST_OFDM_RATE;
 572                 }
 573                 rate_n_flags = RATE_MCS_HT_MSK;
 574
 575                 if (is_siso(tbl->lq_type))
 576                         rate_n_flags |= iwl_rates[index].plcp_siso;
 577                 else if (is_mimo2(tbl->lq_type))
 578                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 579                 else
 580                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 581         } else {
 582                 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 583         }
 584
 585         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 586                                                      RATE_MCS_ANT_ABC_MSK);
 587
 588         if (is_Ht(tbl->lq_type)) {
 589                 if (tbl->is_ht40) {
 590                         if (tbl->is_dup)
 591                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 592                         else
 593                                 rate_n_flags |= RATE_MCS_HT40_MSK;
 594                 }
 595                 if (tbl->is_SGI)
 596                         rate_n_flags |= RATE_MCS_SGI_MSK;
 597
 598                 if (use_green) {
 599                         rate_n_flags |= RATE_MCS_GF_MSK;
 600                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 601                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 602                                 IWL_ERR(priv, "GF was set with SGI:SISO\n");
 603                         }
 604                 }
 605         }
 606         return rate_n_flags;
 607 }
 608
 609 /*
 610  * Interpret uCode API's rate_n_flags format,
 611  * fill "search" or "active" tx mode table.
 612  */
 613 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 614                                     enum ieee80211_band band,
 615                                     struct iwl_scale_tbl_info *tbl,
 616                                     int *rate_idx)
 617 {
 618         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 619         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 620         u8 mcs;
 621
 622         memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
 623         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 624
 625         if (*rate_idx  == IWL_RATE_INVALID) {
 626                 *rate_idx = -1;
 627                 return -EINVAL;
 628         }
 629         tbl->is_SGI = 0;        /* default legacy setup */
 630         tbl->is_ht40 = 0;
 631         tbl->is_dup = 0;
 632         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 633         tbl->lq_type = LQ_NONE;
 634         tbl->max_search = IWL_MAX_SEARCH;
 635
 636         /* legacy rate format */
 637         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 638                 if (num_of_ant == 1) {
 639                         if (band == IEEE80211_BAND_5GHZ)
 640                                 tbl->lq_type = LQ_A;
 641                         else
 642                                 tbl->lq_type = LQ_G;
 643                 }
 644         /* HT rate format */
 645         } else {
 646                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 647                         tbl->is_SGI = 1;
 648
 649                 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
 650                     (rate_n_flags & RATE_MCS_DUP_MSK))
 651                         tbl->is_ht40 = 1;
 652
 653                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 654                         tbl->is_dup = 1;
 655
 656                 mcs = rs_extract_rate(rate_n_flags);
 657
 658                 /* SISO */
 659                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 660                         if (num_of_ant == 1)
 661                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 662                 /* MIMO2 */
 663                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 664                         if (num_of_ant == 2)
 665                                 tbl->lq_type = LQ_MIMO2;
 666                 /* MIMO3 */
 667                 } else {
 668                         if (num_of_ant == 3) {
 669                                 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
 670                                 tbl->lq_type = LQ_MIMO3;
 671                         }
 672                 }
 673         }
 674         return 0;
 675 }
 676
 677 /* switch to another antenna/antennas and return 1 */
 678 /* if no other valid antenna found, return 0 */
 679 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 680                              struct iwl_scale_tbl_info *tbl)
 681 {
 682         u8 new_ant_type;
 683
 684         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 685                 return 0;
 686
 687         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 688                 return 0;
 689
 690         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 691
 692         while ((new_ant_type != tbl->ant_type) &&
 693                !rs_is_valid_ant(valid_ant, new_ant_type))
 694                 new_ant_type = ant_toggle_lookup[new_ant_type];
 695
 696         if (new_ant_type == tbl->ant_type)
 697                 return 0;
 698
 699         tbl->ant_type = new_ant_type;
 700         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 701         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 702         return 1;
 703 }
 704
 705 /**
 706  * Green-field mode is valid if the station supports it and
 707  * there are no non-GF stations present in the BSS.
 708  */
 709 static bool rs_use_green(struct ieee80211_sta *sta)
 710 {
 711         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 712         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
 713
 714         return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
 715                 !(ctx->ht.non_gf_sta_present);
 716 }
 717
 718 /**
 719  * rs_get_supported_rates - get the available rates
 720  *
 721  * if management frame or broadcast frame only return
 722  * basic available rates.
 723  *
 724  */
 725 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 726                                   struct ieee80211_hdr *hdr,
 727                                   enum iwl_table_type rate_type)
 728 {
 729         if (is_legacy(rate_type)) {
 730                 return lq_sta->active_legacy_rate;
 731         } else {
 732                 if (is_siso(rate_type))
 733                         return lq_sta->active_siso_rate;
 734                 else if (is_mimo2(rate_type))
 735                         return lq_sta->active_mimo2_rate;
 736                 else
 737                         return lq_sta->active_mimo3_rate;
 738         }
 739 }
 740
 741 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 742                                 int rate_type)
 743 {
 744         u8 high = IWL_RATE_INVALID;
 745         u8 low = IWL_RATE_INVALID;
 746
 747         /* 802.11A or ht walks to the next literal adjacent rate in
 748          * the rate table */
 749         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 750                 int i;
 751                 u32 mask;
 752
 753                 /* Find the previous rate that is in the rate mask */
 754                 i = index - 1;
 755                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 756                         if (rate_mask & mask) {
 757                                 low = i;
 758                                 break;
 759                         }
 760                 }
 761
 762                 /* Find the next rate that is in the rate mask */
 763                 i = index + 1;
 764                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 765                         if (rate_mask & mask) {
 766                                 high = i;
 767                                 break;
 768                         }
 769                 }
 770
 771                 return (high << 8) | low;
 772         }
 773
 774         low = index;
 775         while (low != IWL_RATE_INVALID) {
 776                 low = iwl_rates[low].prev_rs;
 777                 if (low == IWL_RATE_INVALID)
 778                         break;
 779                 if (rate_mask & (1 << low))
 780                         break;
 781                 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
 782         }
 783
 784         high = index;
 785         while (high != IWL_RATE_INVALID) {
 786                 high = iwl_rates[high].next_rs;
 787                 if (high == IWL_RATE_INVALID)
 788                         break;
 789                 if (rate_mask & (1 << high))
 790                         break;
 791                 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
 792         }
 793
 794         return (high << 8) | low;
 795 }
 796
 797 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 798                              struct iwl_scale_tbl_info *tbl,
 799                              u8 scale_index, u8 ht_possible)
 800 {
 801         s32 low;
 802         u16 rate_mask;
 803         u16 high_low;
 804         u8 switch_to_legacy = 0;
 805         u8 is_green = lq_sta->is_green;
 806         struct iwl_priv *priv = lq_sta->drv;
 807
 808         /* check if we need to switch from HT to legacy rates.
 809          * assumption is that mandatory rates (1Mbps or 6Mbps)
 810          * are always supported (spec demand) */
 811         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 812                 switch_to_legacy = 1;
 813                 scale_index = rs_ht_to_legacy[scale_index];
 814                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 815                         tbl->lq_type = LQ_A;
 816                 else
 817                         tbl->lq_type = LQ_G;
 818
 819                 if (num_of_ant(tbl->ant_type) > 1)
 820                         tbl->ant_type =
 821                                 first_antenna(priv->hw_params.valid_tx_ant);
 822
 823                 tbl->is_ht40 = 0;
 824                 tbl->is_SGI = 0;
 825                 tbl->max_search = IWL_MAX_SEARCH;
 826         }
 827
 828         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 829
 830         /* Mask with station rate restriction */
 831         if (is_legacy(tbl->lq_type)) {
 832                 /* supp_rates has no CCK bits in A mode */
 833                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 834                         rate_mask  = (u16)(rate_mask &
 835                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 836                 else
 837                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 838         }
 839
 840         /* If we switched from HT to legacy, check current rate */
 841         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 842                 low = scale_index;
 843                 goto out;
 844         }
 845
 846         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 847                                         tbl->lq_type);
 848         low = high_low & 0xff;
 849
 850         if (low == IWL_RATE_INVALID)
 851                 low = scale_index;
 852
 853 out:
 854         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 855 }
 856
 857 /*
 858  * Simple function to compare two rate scale table types
 859  */
 860 static bool table_type_matches(struct iwl_scale_tbl_info *a,
 861                                struct iwl_scale_tbl_info *b)
 862 {
 863         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 864                 (a->is_SGI == b->is_SGI);
 865 }
 866
 867 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 868                             struct iwl_lq_sta *lq_sta)
 869 {
 870         struct iwl_scale_tbl_info *tbl;
 871         bool full_concurrent = priv->bt_full_concurrent;
 872         unsigned long flags;
 873
 874         if (priv->bt_ant_couple_ok) {
 875                 /*
 876                  * Is there a need to switch between
 877                  * full concurrency and 3-wire?
 878                  */
 879                 spin_lock_irqsave(&priv->lock, flags);
 880                 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
 881                         full_concurrent = true;
 882                 else
 883                         full_concurrent = false;
 884                 spin_unlock_irqrestore(&priv->lock, flags);
 885         }
 886         if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
 887             (priv->bt_full_concurrent != full_concurrent)) {
 888                 priv->bt_full_concurrent = full_concurrent;
 889
 890                 /* Update uCode's rate table. */
 891                 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 892                 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
 893                 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 894
 895                 queue_work(priv->workqueue, &priv->bt_full_concurrency);
 896         }
 897 }
 898
 899 /*
 900  * mac80211 sends us Tx status
 901  */
 902 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 903                          struct ieee80211_sta *sta, void *priv_sta,
 904                          struct sk_buff *skb)
 905 {
 906         int legacy_success;
 907         int retries;
 908         int rs_index, mac_index, i;
 909         struct iwl_lq_sta *lq_sta = priv_sta;
 910         struct iwl_link_quality_cmd *table;
 911         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 912         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
 913         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 914         enum mac80211_rate_control_flags mac_flags;
 915         u32 tx_rate;
 916         struct iwl_scale_tbl_info tbl_type;
 917         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 918         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 919         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
 920
 921         IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
 922
 923         /* Treat uninitialized rate scaling data same as non-existing. */
 924         if (!lq_sta) {
 925                 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
 926                 return;
 927         } else if (!lq_sta->drv) {
 928                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
 929                 return;
 930         }
 931
 932         if (!ieee80211_is_data(hdr->frame_control) ||
 933             info->flags & IEEE80211_TX_CTL_NO_ACK)
 934                 return;
 935
 936         /* This packet was aggregated but doesn't carry status info */
 937         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 938             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 939                 return;
 940
 941         /*
 942          * Ignore this Tx frame response if its initial rate doesn't match
 943          * that of latest Link Quality command.  There may be stragglers
 944          * from a previous Link Quality command, but we're no longer interested
 945          * in those; they're either from the "active" mode while we're trying
 946          * to check "search" mode, or a prior "search" mode after we've moved
 947          * to a new "search" mode (which might become the new "active" mode).
 948          */
 949         table = &lq_sta->lq;
 950         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 951         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 952         if (priv->band == IEEE80211_BAND_5GHZ)
 953                 rs_index -= IWL_FIRST_OFDM_RATE;
 954         mac_flags = info->status.rates[0].flags;
 955         mac_index = info->status.rates[0].idx;
 956         /* For HT packets, map MCS to PLCP */
 957         if (mac_flags & IEEE80211_TX_RC_MCS) {
 958                 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
 959                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 960                         mac_index++;
 961                 /*
 962                  * mac80211 HT index is always zero-indexed; we need to move
 963                  * HT OFDM rates after CCK rates in 2.4 GHz band
 964                  */
 965                 if (priv->band == IEEE80211_BAND_2GHZ)
 966                         mac_index += IWL_FIRST_OFDM_RATE;
 967         }
 968         /* Here we actually compare this rate to the latest LQ command */
 969         if ((mac_index < 0) ||
 970             (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 971             (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 972             (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
 973             (tbl_type.ant_type != info->antenna_sel_tx) ||
 974             (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 975             (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 976             (rs_index != mac_index)) {
 977                 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
 978                 /*
 979                  * Since rates mis-match, the last LQ command may have failed.
 980                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 981                  * ... driver.
 982                  */
 983                 lq_sta->missed_rate_counter++;
 984                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 985                         lq_sta->missed_rate_counter = 0;
 986                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 987                 }
 988                 /* Regardless, ignore this status info for outdated rate */
 989                 return;
 990         } else
 991                 /* Rate did match, so reset the missed_rate_counter */
 992                 lq_sta->missed_rate_counter = 0;
 993
 994         /* Figure out if rate scale algorithm is in active or search table */
 995         if (table_type_matches(&tbl_type,
 996                                 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 997                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 998                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 999         } else if (table_type_matches(&tbl_type,
1000                                 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
1001                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1002                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1003         } else {
1004                 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
1005                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1006                 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
1007                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1008                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1009                 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1010                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1011                 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1012                         tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1013                 /*
1014                  * no matching table found, let's by-pass the data collection
1015                  * and continue to perform rate scale to find the rate table
1016                  */
1017                 rs_stay_in_table(lq_sta, true);
1018                 goto done;
1019         }
1020
1021         /*
1022          * Updating the frame history depends on whether packets were
1023          * aggregated.
1024          *
1025          * For aggregation, all packets were transmitted at the same rate, the
1026          * first index into rate scale table.
1027          */
1028         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1029                 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1030                 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1031                                 &rs_index);
1032                 rs_collect_tx_data(curr_tbl, rs_index,
1033                                    info->status.ampdu_len,
1034                                    info->status.ampdu_ack_len);
1035
1036                 /* Update success/fail counts if not searching for new mode */
1037                 if (lq_sta->stay_in_tbl) {
1038                         lq_sta->total_success += info->status.ampdu_ack_len;
1039                         lq_sta->total_failed += (info->status.ampdu_len -
1040                                         info->status.ampdu_ack_len);
1041                 }
1042         } else {
1043         /*
1044          * For legacy, update frame history with for each Tx retry.
1045          */
1046                 retries = info->status.rates[0].count - 1;
1047                 /* HW doesn't send more than 15 retries */
1048                 retries = min(retries, 15);
1049
1050                 /* The last transmission may have been successful */
1051                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1052                 /* Collect data for each rate used during failed TX attempts */
1053                 for (i = 0; i <= retries; ++i) {
1054                         tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1055                         rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1056                                         &tbl_type, &rs_index);
1057                         /*
1058                          * Only collect stats if retried rate is in the same RS
1059                          * table as active/search.
1060                          */
1061                         if (table_type_matches(&tbl_type, curr_tbl))
1062                                 tmp_tbl = curr_tbl;
1063                         else if (table_type_matches(&tbl_type, other_tbl))
1064                                 tmp_tbl = other_tbl;
1065                         else
1066                                 continue;
1067                         rs_collect_tx_data(tmp_tbl, rs_index, 1,
1068                                            i < retries ? 0 : legacy_success);
1069                 }
1070
1071                 /* Update success/fail counts if not searching for new mode */
1072                 if (lq_sta->stay_in_tbl) {
1073                         lq_sta->total_success += legacy_success;
1074                         lq_sta->total_failed += retries + (1 - legacy_success);
1075                 }
1076         }
1077         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1078         lq_sta->last_rate_n_flags = tx_rate;
1079 done:
1080         /* See if there's a better rate or modulation mode to try. */
1081         if (sta && sta->supp_rates[sband->band])
1082                 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1083 #ifdef CONFIG_MAC80211_DEBUGFS
1084         if ((priv->tm_fixed_rate) &&
1085             (priv->tm_fixed_rate != lq_sta->dbg_fixed_rate))
1086                 rs_program_fix_rate(priv, lq_sta);
1087 #endif
1088         if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist)
1089                 rs_bt_update_lq(priv, ctx, lq_sta);
1090 }
1091
1092 /*
1093  * Begin a period of staying with a selected modulation mode.
1094  * Set "stay_in_tbl" flag to prevent any mode switches.
1095  * Set frame tx success limits according to legacy vs. high-throughput,
1096  * and reset overall (spanning all rates) tx success history statistics.
1097  * These control how long we stay using same modulation mode before
1098  * searching for a new mode.
1099  */
1100 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1101                                  struct iwl_lq_sta *lq_sta)
1102 {
1103         IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1104         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1105         if (is_legacy) {
1106                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1107                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1108                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1109         } else {
1110                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1111                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1112                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1113         }
1114         lq_sta->table_count = 0;
1115         lq_sta->total_failed = 0;
1116         lq_sta->total_success = 0;
1117         lq_sta->flush_timer = jiffies;
1118         lq_sta->action_counter = 0;
1119 }
1120
1121 /*
1122  * Find correct throughput table for given mode of modulation
1123  */
1124 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1125                                       struct iwl_scale_tbl_info *tbl)
1126 {
1127         /* Used to choose among HT tables */
1128         s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1129
1130         /* Check for invalid LQ type */
1131         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1132                 tbl->expected_tpt = expected_tpt_legacy;
1133                 return;
1134         }
1135
1136         /* Legacy rates have only one table */
1137         if (is_legacy(tbl->lq_type)) {
1138                 tbl->expected_tpt = expected_tpt_legacy;
1139                 return;
1140         }
1141
1142         /* Choose among many HT tables depending on number of streams
1143          * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1144          * status */
1145         if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1146                 ht_tbl_pointer = expected_tpt_siso20MHz;
1147         else if (is_siso(tbl->lq_type))
1148                 ht_tbl_pointer = expected_tpt_siso40MHz;
1149         else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1150                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1151         else if (is_mimo2(tbl->lq_type))
1152                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1153         else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1154                 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1155         else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1156                 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1157
1158         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
1159                 tbl->expected_tpt = ht_tbl_pointer[0];
1160         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1161                 tbl->expected_tpt = ht_tbl_pointer[1];
1162         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1163                 tbl->expected_tpt = ht_tbl_pointer[2];
1164         else                                            /* AGG+SGI */
1165                 tbl->expected_tpt = ht_tbl_pointer[3];
1166 }
1167
1168 /*
1169  * Find starting rate for new "search" high-throughput mode of modulation.
1170  * Goal is to find lowest expected rate (under perfect conditions) that is
1171  * above the current measured throughput of "active" mode, to give new mode
1172  * a fair chance to prove itself without too many challenges.
1173  *
1174  * This gets called when transitioning to more aggressive modulation
1175  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1176  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1177  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1178  * bit rate will typically need to increase, but not if performance was bad.
1179  */
1180 static s32 rs_get_best_rate(struct iwl_priv *priv,
1181                             struct iwl_lq_sta *lq_sta,
1182                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1183                             u16 rate_mask, s8 index)
1184 {
1185         /* "active" values */
1186         struct iwl_scale_tbl_info *active_tbl =
1187             &(lq_sta->lq_info[lq_sta->active_tbl]);
1188         s32 active_sr = active_tbl->win[index].success_ratio;
1189         s32 active_tpt = active_tbl->expected_tpt[index];
1190
1191         /* expected "search" throughput */
1192         s32 *tpt_tbl = tbl->expected_tpt;
1193
1194         s32 new_rate, high, low, start_hi;
1195         u16 high_low;
1196         s8 rate = index;
1197
1198         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1199
1200         for (; ;) {
1201                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1202                                                 tbl->lq_type);
1203
1204                 low = high_low & 0xff;
1205                 high = (high_low >> 8) & 0xff;
1206
1207                 /*
1208                  * Lower the "search" bit rate, to give new "search" mode
1209                  * approximately the same throughput as "active" if:
1210                  *
1211                  * 1) "Active" mode has been working modestly well (but not
1212                  *    great), and expected "search" throughput (under perfect
1213                  *    conditions) at candidate rate is above the actual
1214                  *    measured "active" throughput (but less than expected
1215                  *    "active" throughput under perfect conditions).
1216                  * OR
1217                  * 2) "Active" mode has been working perfectly or very well
1218                  *    and expected "search" throughput (under perfect
1219                  *    conditions) at candidate rate is above expected
1220                  *    "active" throughput (under perfect conditions).
1221                  */
1222                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1223                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1224                       (active_sr <= IWL_RATE_HIGH_TH) &&
1225                       (tpt_tbl[rate] <= active_tpt))) ||
1226                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1227                      (tpt_tbl[rate] > active_tpt))) {
1228
1229                         /* (2nd or later pass)
1230                          * If we've already tried to raise the rate, and are
1231                          * now trying to lower it, use the higher rate. */
1232                         if (start_hi != IWL_RATE_INVALID) {
1233                                 new_rate = start_hi;
1234                                 break;
1235                         }
1236
1237                         new_rate = rate;
1238
1239                         /* Loop again with lower rate */
1240                         if (low != IWL_RATE_INVALID)
1241                                 rate = low;
1242
1243                         /* Lower rate not available, use the original */
1244                         else
1245                                 break;
1246
1247                 /* Else try to raise the "search" rate to match "active" */
1248                 } else {
1249                         /* (2nd or later pass)
1250                          * If we've already tried to lower the rate, and are
1251                          * now trying to raise it, use the lower rate. */
1252                         if (new_rate != IWL_RATE_INVALID)
1253                                 break;
1254
1255                         /* Loop again with higher rate */
1256                         else if (high != IWL_RATE_INVALID) {
1257                                 start_hi = high;
1258                                 rate = high;
1259
1260                         /* Higher rate not available, use the original */
1261                         } else {
1262                                 new_rate = rate;
1263                                 break;
1264                         }
1265                 }
1266         }
1267
1268         return new_rate;
1269 }
1270
1271 /*
1272  * Set up search table for MIMO2
1273  */
1274 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1275                              struct iwl_lq_sta *lq_sta,
1276                              struct ieee80211_conf *conf,
1277                              struct ieee80211_sta *sta,
1278                              struct iwl_scale_tbl_info *tbl, int index)
1279 {
1280         u16 rate_mask;
1281         s32 rate;
1282         s8 is_green = lq_sta->is_green;
1283         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1284         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1285
1286         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1287                 return -1;
1288
1289         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1290                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1291                 return -1;
1292
1293         /* Need both Tx chains/antennas to support MIMO */
1294         if (priv->hw_params.tx_chains_num < 2)
1295                 return -1;
1296
1297         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1298
1299         tbl->lq_type = LQ_MIMO2;
1300         tbl->is_dup = lq_sta->is_dup;
1301         tbl->action = 0;
1302         tbl->max_search = IWL_MAX_SEARCH;
1303         rate_mask = lq_sta->active_mimo2_rate;
1304
1305         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1306                 tbl->is_ht40 = 1;
1307         else
1308                 tbl->is_ht40 = 0;
1309
1310         rs_set_expected_tpt_table(lq_sta, tbl);
1311
1312         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1313
1314         IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1315         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1316                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1317                                                 rate, rate_mask);
1318                 return -1;
1319         }
1320         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1321
1322         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1323                      tbl->current_rate, is_green);
1324         return 0;
1325 }
1326
1327 /*
1328  * Set up search table for MIMO3
1329  */
1330 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1331                              struct iwl_lq_sta *lq_sta,
1332                              struct ieee80211_conf *conf,
1333                              struct ieee80211_sta *sta,
1334                              struct iwl_scale_tbl_info *tbl, int index)
1335 {
1336         u16 rate_mask;
1337         s32 rate;
1338         s8 is_green = lq_sta->is_green;
1339         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1340         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1341
1342         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1343                 return -1;
1344
1345         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1346                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1347                 return -1;
1348
1349         /* Need both Tx chains/antennas to support MIMO */
1350         if (priv->hw_params.tx_chains_num < 3)
1351                 return -1;
1352
1353         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1354
1355         tbl->lq_type = LQ_MIMO3;
1356         tbl->is_dup = lq_sta->is_dup;
1357         tbl->action = 0;
1358         tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1359         rate_mask = lq_sta->active_mimo3_rate;
1360
1361         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1362                 tbl->is_ht40 = 1;
1363         else
1364                 tbl->is_ht40 = 0;
1365
1366         rs_set_expected_tpt_table(lq_sta, tbl);
1367
1368         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1369
1370         IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1371                 rate, rate_mask);
1372         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1373                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1374                                                 rate, rate_mask);
1375                 return -1;
1376         }
1377         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1378
1379         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1380                      tbl->current_rate, is_green);
1381         return 0;
1382 }
1383
1384 /*
1385  * Set up search table for SISO
1386  */
1387 static int rs_switch_to_siso(struct iwl_priv *priv,
1388                              struct iwl_lq_sta *lq_sta,
1389                              struct ieee80211_conf *conf,
1390                              struct ieee80211_sta *sta,
1391                              struct iwl_scale_tbl_info *tbl, int index)
1392 {
1393         u16 rate_mask;
1394         u8 is_green = lq_sta->is_green;
1395         s32 rate;
1396         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1397         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1398
1399         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1400                 return -1;
1401
1402         IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1403
1404         tbl->is_dup = lq_sta->is_dup;
1405         tbl->lq_type = LQ_SISO;
1406         tbl->action = 0;
1407         tbl->max_search = IWL_MAX_SEARCH;
1408         rate_mask = lq_sta->active_siso_rate;
1409
1410         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1411                 tbl->is_ht40 = 1;
1412         else
1413                 tbl->is_ht40 = 0;
1414
1415         if (is_green)
1416                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1417
1418         rs_set_expected_tpt_table(lq_sta, tbl);
1419         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1420
1421         IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1422         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1423                 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1424                              rate, rate_mask);
1425                 return -1;
1426         }
1427         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1428         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1429                      tbl->current_rate, is_green);
1430         return 0;
1431 }
1432
1433 /*
1434  * Try to switch to new modulation mode from legacy
1435  */
1436 static int rs_move_legacy_other(struct iwl_priv *priv,
1437                                 struct iwl_lq_sta *lq_sta,
1438                                 struct ieee80211_conf *conf,
1439                                 struct ieee80211_sta *sta,
1440                                 int index)
1441 {
1442         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1443         struct iwl_scale_tbl_info *search_tbl =
1444                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1445         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1446         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1447                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1448         u8 start_action;
1449         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1450         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1451         int ret = 0;
1452         u8 update_search_tbl_counter = 0;
1453
1454         switch (priv->bt_traffic_load) {
1455         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1456                 /* nothing */
1457                 break;
1458         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1459                 /* avoid antenna B unless MIMO */
1460                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1461                 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1462                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1463                 break;
1464         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1465         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1466                 /* avoid antenna B and MIMO */
1467                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1468                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1469                     tbl->action != IWL_LEGACY_SWITCH_SISO)
1470                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1471                 break;
1472         default:
1473                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1474                 break;
1475         }
1476
1477         if (!iwl_ht_enabled(priv))
1478                 /* stay in Legacy */
1479                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1480         else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1481                    tbl->action > IWL_LEGACY_SWITCH_SISO)
1482                 tbl->action = IWL_LEGACY_SWITCH_SISO;
1483
1484         /* configure as 1x1 if bt full concurrency */
1485         if (priv->bt_full_concurrent) {
1486                 if (!iwl_ht_enabled(priv))
1487                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1488                 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1489                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1490                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1491         }
1492
1493         start_action = tbl->action;
1494         for (; ;) {
1495                 lq_sta->action_counter++;
1496                 switch (tbl->action) {
1497                 case IWL_LEGACY_SWITCH_ANTENNA1:
1498                 case IWL_LEGACY_SWITCH_ANTENNA2:
1499                         IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1500
1501                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1502                                                         tx_chains_num <= 1) ||
1503                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1504                                                         tx_chains_num <= 2))
1505                                 break;
1506
1507                         /* Don't change antenna if success has been great */
1508                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1509                             !priv->bt_full_concurrent &&
1510                             priv->bt_traffic_load ==
1511                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1512                                 break;
1513
1514                         /* Set up search table to try other antenna */
1515                         memcpy(search_tbl, tbl, sz);
1516
1517                         if (rs_toggle_antenna(valid_tx_ant,
1518                                 &search_tbl->current_rate, search_tbl)) {
1519                                 update_search_tbl_counter = 1;
1520                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1521                                 goto out;
1522                         }
1523                         break;
1524                 case IWL_LEGACY_SWITCH_SISO:
1525                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1526
1527                         /* Set up search table to try SISO */
1528                         memcpy(search_tbl, tbl, sz);
1529                         search_tbl->is_SGI = 0;
1530                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1531                                                  search_tbl, index);
1532                         if (!ret) {
1533                                 lq_sta->action_counter = 0;
1534                                 goto out;
1535                         }
1536
1537                         break;
1538                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1539                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1540                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1541                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1542
1543                         /* Set up search table to try MIMO */
1544                         memcpy(search_tbl, tbl, sz);
1545                         search_tbl->is_SGI = 0;
1546
1547                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1548                                 search_tbl->ant_type = ANT_AB;
1549                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1550                                 search_tbl->ant_type = ANT_AC;
1551                         else
1552                                 search_tbl->ant_type = ANT_BC;
1553
1554                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1555                                 break;
1556
1557                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1558                                                  search_tbl, index);
1559                         if (!ret) {
1560                                 lq_sta->action_counter = 0;
1561                                 goto out;
1562                         }
1563                         break;
1564
1565                 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1566                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1567
1568                         /* Set up search table to try MIMO3 */
1569                         memcpy(search_tbl, tbl, sz);
1570                         search_tbl->is_SGI = 0;
1571
1572                         search_tbl->ant_type = ANT_ABC;
1573
1574                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1575                                 break;
1576
1577                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1578                                                  search_tbl, index);
1579                         if (!ret) {
1580                                 lq_sta->action_counter = 0;
1581                                 goto out;
1582                         }
1583                         break;
1584                 }
1585                 tbl->action++;
1586                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1587                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1588
1589                 if (tbl->action == start_action)
1590                         break;
1591
1592         }
1593         search_tbl->lq_type = LQ_NONE;
1594         return 0;
1595
1596 out:
1597         lq_sta->search_better_tbl = 1;
1598         tbl->action++;
1599         if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1600                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1601         if (update_search_tbl_counter)
1602                 search_tbl->action = tbl->action;
1603         return 0;
1604
1605 }
1606
1607 /*
1608  * Try to switch to new modulation mode from SISO
1609  */
1610 static int rs_move_siso_to_other(struct iwl_priv *priv,
1611                                  struct iwl_lq_sta *lq_sta,
1612                                  struct ieee80211_conf *conf,
1613                                  struct ieee80211_sta *sta, int index)
1614 {
1615         u8 is_green = lq_sta->is_green;
1616         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1617         struct iwl_scale_tbl_info *search_tbl =
1618                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1619         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1620         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1621         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1622                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1623         u8 start_action;
1624         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1625         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1626         u8 update_search_tbl_counter = 0;
1627         int ret;
1628
1629         switch (priv->bt_traffic_load) {
1630         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1631                 /* nothing */
1632                 break;
1633         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1634                 /* avoid antenna B unless MIMO */
1635                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1636                 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1637                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1638                 break;
1639         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1640         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1641                 /* avoid antenna B and MIMO */
1642                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1643                 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1644                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1645                 break;
1646         default:
1647                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1648                 break;
1649         }
1650
1651         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1652             tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1653                 /* stay in SISO */
1654                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1655         }
1656
1657         /* configure as 1x1 if bt full concurrency */
1658         if (priv->bt_full_concurrent) {
1659                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1660                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1661                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1662         }
1663
1664         start_action = tbl->action;
1665         for (;;) {
1666                 lq_sta->action_counter++;
1667                 switch (tbl->action) {
1668                 case IWL_SISO_SWITCH_ANTENNA1:
1669                 case IWL_SISO_SWITCH_ANTENNA2:
1670                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1671                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1672                                                 tx_chains_num <= 1) ||
1673                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1674                                                 tx_chains_num <= 2))
1675                                 break;
1676
1677                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1678                             !priv->bt_full_concurrent &&
1679                             priv->bt_traffic_load ==
1680                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1681                                 break;
1682
1683                         memcpy(search_tbl, tbl, sz);
1684                         if (rs_toggle_antenna(valid_tx_ant,
1685                                        &search_tbl->current_rate, search_tbl)) {
1686                                 update_search_tbl_counter = 1;
1687                                 goto out;
1688                         }
1689                         break;
1690                 case IWL_SISO_SWITCH_MIMO2_AB:
1691                 case IWL_SISO_SWITCH_MIMO2_AC:
1692                 case IWL_SISO_SWITCH_MIMO2_BC:
1693                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1694                         memcpy(search_tbl, tbl, sz);
1695                         search_tbl->is_SGI = 0;
1696
1697                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1698                                 search_tbl->ant_type = ANT_AB;
1699                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1700                                 search_tbl->ant_type = ANT_AC;
1701                         else
1702                                 search_tbl->ant_type = ANT_BC;
1703
1704                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1705                                 break;
1706
1707                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1708                                                  search_tbl, index);
1709                         if (!ret)
1710                                 goto out;
1711                         break;
1712                 case IWL_SISO_SWITCH_GI:
1713                         if (!tbl->is_ht40 && !(ht_cap->cap &
1714                                                 IEEE80211_HT_CAP_SGI_20))
1715                                 break;
1716                         if (tbl->is_ht40 && !(ht_cap->cap &
1717                                                 IEEE80211_HT_CAP_SGI_40))
1718                                 break;
1719
1720                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1721
1722                         memcpy(search_tbl, tbl, sz);
1723                         if (is_green) {
1724                                 if (!tbl->is_SGI)
1725                                         break;
1726                                 else
1727                                         IWL_ERR(priv,
1728                                                 "SGI was set in GF+SISO\n");
1729                         }
1730                         search_tbl->is_SGI = !tbl->is_SGI;
1731                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1732                         if (tbl->is_SGI) {
1733                                 s32 tpt = lq_sta->last_tpt / 100;
1734                                 if (tpt >= search_tbl->expected_tpt[index])
1735                                         break;
1736                         }
1737                         search_tbl->current_rate =
1738                                 rate_n_flags_from_tbl(priv, search_tbl,
1739                                                       index, is_green);
1740                         update_search_tbl_counter = 1;
1741                         goto out;
1742                 case IWL_SISO_SWITCH_MIMO3_ABC:
1743                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1744                         memcpy(search_tbl, tbl, sz);
1745                         search_tbl->is_SGI = 0;
1746                         search_tbl->ant_type = ANT_ABC;
1747
1748                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1749                                 break;
1750
1751                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1752                                                  search_tbl, index);
1753                         if (!ret)
1754                                 goto out;
1755                         break;
1756                 }
1757                 tbl->action++;
1758                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1759                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1760
1761                 if (tbl->action == start_action)
1762                         break;
1763         }
1764         search_tbl->lq_type = LQ_NONE;
1765         return 0;
1766
1767  out:
1768         lq_sta->search_better_tbl = 1;
1769         tbl->action++;
1770         if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1771                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1772         if (update_search_tbl_counter)
1773                 search_tbl->action = tbl->action;
1774
1775         return 0;
1776 }
1777
1778 /*
1779  * Try to switch to new modulation mode from MIMO2
1780  */
1781 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1782                                  struct iwl_lq_sta *lq_sta,
1783                                  struct ieee80211_conf *conf,
1784                                  struct ieee80211_sta *sta, int index)
1785 {
1786         s8 is_green = lq_sta->is_green;
1787         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1788         struct iwl_scale_tbl_info *search_tbl =
1789                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1790         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1791         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1792         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1793                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1794         u8 start_action;
1795         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1796         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1797         u8 update_search_tbl_counter = 0;
1798         int ret;
1799
1800         switch (priv->bt_traffic_load) {
1801         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1802                 /* nothing */
1803                 break;
1804         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1805         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1806                 /* avoid antenna B and MIMO */
1807                 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1808                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1809                 break;
1810         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1811                 /* avoid antenna B unless MIMO */
1812                 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1813                     tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1814                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1815                 break;
1816         default:
1817                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1818                 break;
1819         }
1820
1821         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1822             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1823              tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1824                 /* switch in SISO */
1825                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1826         }
1827
1828         /* configure as 1x1 if bt full concurrency */
1829         if (priv->bt_full_concurrent &&
1830             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1831              tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1832                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1833
1834         start_action = tbl->action;
1835         for (;;) {
1836                 lq_sta->action_counter++;
1837                 switch (tbl->action) {
1838                 case IWL_MIMO2_SWITCH_ANTENNA1:
1839                 case IWL_MIMO2_SWITCH_ANTENNA2:
1840                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1841
1842                         if (tx_chains_num <= 2)
1843                                 break;
1844
1845                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1846                                 break;
1847
1848                         memcpy(search_tbl, tbl, sz);
1849                         if (rs_toggle_antenna(valid_tx_ant,
1850                                        &search_tbl->current_rate, search_tbl)) {
1851                                 update_search_tbl_counter = 1;
1852                                 goto out;
1853                         }
1854                         break;
1855                 case IWL_MIMO2_SWITCH_SISO_A:
1856                 case IWL_MIMO2_SWITCH_SISO_B:
1857                 case IWL_MIMO2_SWITCH_SISO_C:
1858                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1859
1860                         /* Set up new search table for SISO */
1861                         memcpy(search_tbl, tbl, sz);
1862
1863                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1864                                 search_tbl->ant_type = ANT_A;
1865                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1866                                 search_tbl->ant_type = ANT_B;
1867                         else
1868                                 search_tbl->ant_type = ANT_C;
1869
1870                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1871                                 break;
1872
1873                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1874                                                  search_tbl, index);
1875                         if (!ret)
1876                                 goto out;
1877
1878                         break;
1879
1880                 case IWL_MIMO2_SWITCH_GI:
1881                         if (!tbl->is_ht40 && !(ht_cap->cap &
1882                                                 IEEE80211_HT_CAP_SGI_20))
1883                                 break;
1884                         if (tbl->is_ht40 && !(ht_cap->cap &
1885                                                 IEEE80211_HT_CAP_SGI_40))
1886                                 break;
1887
1888                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1889
1890                         /* Set up new search table for MIMO2 */
1891                         memcpy(search_tbl, tbl, sz);
1892                         search_tbl->is_SGI = !tbl->is_SGI;
1893                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1894                         /*
1895                          * If active table already uses the fastest possible
1896                          * modulation (dual stream with short guard interval),
1897                          * and it's working well, there's no need to look
1898                          * for a better type of modulation!
1899                          */
1900                         if (tbl->is_SGI) {
1901                                 s32 tpt = lq_sta->last_tpt / 100;
1902                                 if (tpt >= search_tbl->expected_tpt[index])
1903                                         break;
1904                         }
1905                         search_tbl->current_rate =
1906                                 rate_n_flags_from_tbl(priv, search_tbl,
1907                                                       index, is_green);
1908                         update_search_tbl_counter = 1;
1909                         goto out;
1910
1911                 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1912                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1913                         memcpy(search_tbl, tbl, sz);
1914                         search_tbl->is_SGI = 0;
1915                         search_tbl->ant_type = ANT_ABC;
1916
1917                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1918                                 break;
1919
1920                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1921                                                  search_tbl, index);
1922                         if (!ret)
1923                                 goto out;
1924
1925                         break;
1926                 }
1927                 tbl->action++;
1928                 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1929                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1930
1931                 if (tbl->action == start_action)
1932                         break;
1933         }
1934         search_tbl->lq_type = LQ_NONE;
1935         return 0;
1936  out:
1937         lq_sta->search_better_tbl = 1;
1938         tbl->action++;
1939         if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1940                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1941         if (update_search_tbl_counter)
1942                 search_tbl->action = tbl->action;
1943
1944         return 0;
1945
1946 }
1947
1948 /*
1949  * Try to switch to new modulation mode from MIMO3
1950  */
1951 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1952                                  struct iwl_lq_sta *lq_sta,
1953                                  struct ieee80211_conf *conf,
1954                                  struct ieee80211_sta *sta, int index)
1955 {
1956         s8 is_green = lq_sta->is_green;
1957         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1958         struct iwl_scale_tbl_info *search_tbl =
1959                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1960         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1961         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1962         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1963                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1964         u8 start_action;
1965         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1966         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1967         int ret;
1968         u8 update_search_tbl_counter = 0;
1969
1970         switch (priv->bt_traffic_load) {
1971         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1972                 /* nothing */
1973                 break;
1974         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1975         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1976                 /* avoid antenna B and MIMO */
1977                 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1978                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1979                 break;
1980         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1981                 /* avoid antenna B unless MIMO */
1982                 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1983                     tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1984                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1985                 break;
1986         default:
1987                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1988                 break;
1989         }
1990
1991         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1992             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1993              tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1994                 /* switch in SISO */
1995                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1996         }
1997
1998         /* configure as 1x1 if bt full concurrency */
1999         if (priv->bt_full_concurrent &&
2000             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
2001              tbl->action > IWL_MIMO3_SWITCH_SISO_C))
2002                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
2003
2004         start_action = tbl->action;
2005         for (;;) {
2006                 lq_sta->action_counter++;
2007                 switch (tbl->action) {
2008                 case IWL_MIMO3_SWITCH_ANTENNA1:
2009                 case IWL_MIMO3_SWITCH_ANTENNA2:
2010                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
2011
2012                         if (tx_chains_num <= 3)
2013                                 break;
2014
2015                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2016                                 break;
2017
2018                         memcpy(search_tbl, tbl, sz);
2019                         if (rs_toggle_antenna(valid_tx_ant,
2020                                        &search_tbl->current_rate, search_tbl))
2021                                 goto out;
2022                         break;
2023                 case IWL_MIMO3_SWITCH_SISO_A:
2024                 case IWL_MIMO3_SWITCH_SISO_B:
2025                 case IWL_MIMO3_SWITCH_SISO_C:
2026                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2027
2028                         /* Set up new search table for SISO */
2029                         memcpy(search_tbl, tbl, sz);
2030
2031                         if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2032                                 search_tbl->ant_type = ANT_A;
2033                         else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2034                                 search_tbl->ant_type = ANT_B;
2035                         else
2036                                 search_tbl->ant_type = ANT_C;
2037
2038                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2039                                 break;
2040
2041                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2042                                                  search_tbl, index);
2043                         if (!ret)
2044                                 goto out;
2045
2046                         break;
2047
2048                 case IWL_MIMO3_SWITCH_MIMO2_AB:
2049                 case IWL_MIMO3_SWITCH_MIMO2_AC:
2050                 case IWL_MIMO3_SWITCH_MIMO2_BC:
2051                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2052
2053                         memcpy(search_tbl, tbl, sz);
2054                         search_tbl->is_SGI = 0;
2055                         if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2056                                 search_tbl->ant_type = ANT_AB;
2057                         else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2058                                 search_tbl->ant_type = ANT_AC;
2059                         else
2060                                 search_tbl->ant_type = ANT_BC;
2061
2062                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2063                                 break;
2064
2065                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2066                                                  search_tbl, index);
2067                         if (!ret)
2068                                 goto out;
2069
2070                         break;
2071
2072                 case IWL_MIMO3_SWITCH_GI:
2073                         if (!tbl->is_ht40 && !(ht_cap->cap &
2074                                                 IEEE80211_HT_CAP_SGI_20))
2075                                 break;
2076                         if (tbl->is_ht40 && !(ht_cap->cap &
2077                                                 IEEE80211_HT_CAP_SGI_40))
2078                                 break;
2079
2080                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2081
2082                         /* Set up new search table for MIMO */
2083                         memcpy(search_tbl, tbl, sz);
2084                         search_tbl->is_SGI = !tbl->is_SGI;
2085                         rs_set_expected_tpt_table(lq_sta, search_tbl);
2086                         /*
2087                          * If active table already uses the fastest possible
2088                          * modulation (dual stream with short guard interval),
2089                          * and it's working well, there's no need to look
2090                          * for a better type of modulation!
2091                          */
2092                         if (tbl->is_SGI) {
2093                                 s32 tpt = lq_sta->last_tpt / 100;
2094                                 if (tpt >= search_tbl->expected_tpt[index])
2095                                         break;
2096                         }
2097                         search_tbl->current_rate =
2098                                 rate_n_flags_from_tbl(priv, search_tbl,
2099                                                       index, is_green);
2100                         update_search_tbl_counter = 1;
2101                         goto out;
2102                 }
2103                 tbl->action++;
2104                 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2105                         tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2106
2107                 if (tbl->action == start_action)
2108                         break;
2109         }
2110         search_tbl->lq_type = LQ_NONE;
2111         return 0;
2112  out:
2113         lq_sta->search_better_tbl = 1;
2114         tbl->action++;
2115         if (tbl->action > IWL_MIMO3_SWITCH_GI)
2116                 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2117         if (update_search_tbl_counter)
2118                 search_tbl->action = tbl->action;
2119
2120         return 0;
2121
2122 }
2123
2124 /*
2125  * Check whether we should continue using same modulation mode, or
2126  * begin search for a new mode, based on:
2127  * 1) # tx successes or failures while using this mode
2128  * 2) # times calling this function
2129  * 3) elapsed time in this mode (not used, for now)
2130  */
2131 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2132 {
2133         struct iwl_scale_tbl_info *tbl;
2134         int i;
2135         int active_tbl;
2136         int flush_interval_passed = 0;
2137         struct iwl_priv *priv;
2138
2139         priv = lq_sta->drv;
2140         active_tbl = lq_sta->active_tbl;
2141
2142         tbl = &(lq_sta->lq_info[active_tbl]);
2143
2144         /* If we've been disallowing search, see if we should now allow it */
2145         if (lq_sta->stay_in_tbl) {
2146
2147                 /* Elapsed time using current modulation mode */
2148                 if (lq_sta->flush_timer)
2149                         flush_interval_passed =
2150                         time_after(jiffies,
2151                                         (unsigned long)(lq_sta->flush_timer +
2152                                         IWL_RATE_SCALE_FLUSH_INTVL));
2153
2154                 /*
2155                  * Check if we should allow search for new modulation mode.
2156                  * If many frames have failed or succeeded, or we've used
2157                  * this same modulation for a long time, allow search, and
2158                  * reset history stats that keep track of whether we should
2159                  * allow a new search.  Also (below) reset all bitmaps and
2160                  * stats in active history.
2161                  */
2162                 if (force_search ||
2163                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2164                     (lq_sta->total_success > lq_sta->max_success_limit) ||
2165                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2166                      && (flush_interval_passed))) {
2167                         IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
2168                                      lq_sta->total_failed,
2169                                      lq_sta->total_success,
2170                                      flush_interval_passed);
2171
2172                         /* Allow search for new mode */
2173                         lq_sta->stay_in_tbl = 0;        /* only place reset */
2174                         lq_sta->total_failed = 0;
2175                         lq_sta->total_success = 0;
2176                         lq_sta->flush_timer = 0;
2177
2178                 /*
2179                  * Else if we've used this modulation mode enough repetitions
2180                  * (regardless of elapsed time or success/failure), reset
2181                  * history bitmaps and rate-specific stats for all rates in
2182                  * active table.
2183                  */
2184                 } else {
2185                         lq_sta->table_count++;
2186                         if (lq_sta->table_count >=
2187                             lq_sta->table_count_limit) {
2188                                 lq_sta->table_count = 0;
2189
2190                                 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2191                                 for (i = 0; i < IWL_RATE_COUNT; i++)
2192                                         rs_rate_scale_clear_window(
2193                                                 &(tbl->win[i]));
2194                         }
2195                 }
2196
2197                 /* If transitioning to allow "search", reset all history
2198                  * bitmaps and stats in active table (this will become the new
2199                  * "search" table). */
2200                 if (!lq_sta->stay_in_tbl) {
2201                         for (i = 0; i < IWL_RATE_COUNT; i++)
2202                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2203                 }
2204         }
2205 }
2206
2207 /*
2208  * setup rate table in uCode
2209  * return rate_n_flags as used in the table
2210  */
2211 static void rs_update_rate_tbl(struct iwl_priv *priv,
2212                                struct iwl_rxon_context *ctx,
2213                                struct iwl_lq_sta *lq_sta,
2214                                struct iwl_scale_tbl_info *tbl,
2215                                int index, u8 is_green)
2216 {
2217         u32 rate;
2218
2219         /* Update uCode's rate table. */
2220         rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2221         rs_fill_link_cmd(priv, lq_sta, rate);
2222         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2223 }
2224
2225 /*
2226  * Do rate scaling and search for new modulation mode.
2227  */
2228 static void rs_rate_scale_perform(struct iwl_priv *priv,
2229                                   struct sk_buff *skb,
2230                                   struct ieee80211_sta *sta,
2231                                   struct iwl_lq_sta *lq_sta)
2232 {
2233         struct ieee80211_hw *hw = priv->hw;
2234         struct ieee80211_conf *conf = &hw->conf;
2235         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2236         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2237         int low = IWL_RATE_INVALID;
2238         int high = IWL_RATE_INVALID;
2239         int index;
2240         int i;
2241         struct iwl_rate_scale_data *window = NULL;
2242         int current_tpt = IWL_INVALID_VALUE;
2243         int low_tpt = IWL_INVALID_VALUE;
2244         int high_tpt = IWL_INVALID_VALUE;
2245         u32 fail_count;
2246         s8 scale_action = 0;
2247         u16 rate_mask;
2248         u8 update_lq = 0;
2249         struct iwl_scale_tbl_info *tbl, *tbl1;
2250         u16 rate_scale_index_msk = 0;
2251         u8 is_green = 0;
2252         u8 active_tbl = 0;
2253         u8 done_search = 0;
2254         u16 high_low;
2255         s32 sr;
2256         u8 tid = MAX_TID_COUNT;
2257         struct iwl_tid_data *tid_data;
2258         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2259         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
2260
2261         IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2262
2263         /* Send management frames and NO_ACK data using lowest rate. */
2264         /* TODO: this could probably be improved.. */
2265         if (!ieee80211_is_data(hdr->frame_control) ||
2266             info->flags & IEEE80211_TX_CTL_NO_ACK)
2267                 return;
2268
2269         if (!sta || !lq_sta)
2270                 return;
2271
2272         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2273
2274         tid = rs_tl_add_packet(lq_sta, hdr);
2275         if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
2276                 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
2277                 if (tid_data->agg.state == IWL_AGG_OFF)
2278                         lq_sta->is_agg = 0;
2279                 else
2280                         lq_sta->is_agg = 1;
2281         } else
2282                 lq_sta->is_agg = 0;
2283
2284         /*
2285          * Select rate-scale / modulation-mode table to work with in
2286          * the rest of this function:  "search" if searching for better
2287          * modulation mode, or "active" if doing rate scaling within a mode.
2288          */
2289         if (!lq_sta->search_better_tbl)
2290                 active_tbl = lq_sta->active_tbl;
2291         else
2292                 active_tbl = 1 - lq_sta->active_tbl;
2293
2294         tbl = &(lq_sta->lq_info[active_tbl]);
2295         if (is_legacy(tbl->lq_type))
2296                 lq_sta->is_green = 0;
2297         else
2298                 lq_sta->is_green = rs_use_green(sta);
2299         is_green = lq_sta->is_green;
2300
2301         /* current tx rate */
2302         index = lq_sta->last_txrate_idx;
2303
2304         IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2305                        tbl->lq_type);
2306
2307         /* rates available for this association, and for modulation mode */
2308         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2309
2310         IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2311
2312         /* mask with station rate restriction */
2313         if (is_legacy(tbl->lq_type)) {
2314                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2315                         /* supp_rates has no CCK bits in A mode */
2316                         rate_scale_index_msk = (u16) (rate_mask &
2317                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2318                 else
2319                         rate_scale_index_msk = (u16) (rate_mask &
2320                                                       lq_sta->supp_rates);
2321
2322         } else
2323                 rate_scale_index_msk = rate_mask;
2324
2325         if (!rate_scale_index_msk)
2326                 rate_scale_index_msk = rate_mask;
2327
2328         if (!((1 << index) & rate_scale_index_msk)) {
2329                 IWL_ERR(priv, "Current Rate is not valid\n");
2330                 if (lq_sta->search_better_tbl) {
2331                         /* revert to active table if search table is not valid*/
2332                         tbl->lq_type = LQ_NONE;
2333                         lq_sta->search_better_tbl = 0;
2334                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2335                         /* get "active" rate info */
2336                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2337                         rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2338                                            index, is_green);
2339                 }
2340                 return;
2341         }
2342
2343         /* Get expected throughput table and history window for current rate */
2344         if (!tbl->expected_tpt) {
2345                 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2346                 return;
2347         }
2348
2349         /* force user max rate if set by user */
2350         if ((lq_sta->max_rate_idx != -1) &&
2351             (lq_sta->max_rate_idx < index)) {
2352                 index = lq_sta->max_rate_idx;
2353                 update_lq = 1;
2354                 window = &(tbl->win[index]);
2355                 goto lq_update;
2356         }
2357
2358         window = &(tbl->win[index]);
2359
2360         /*
2361          * If there is not enough history to calculate actual average
2362          * throughput, keep analyzing results of more tx frames, without
2363          * changing rate or mode (bypass most of the rest of this function).
2364          * Set up new rate table in uCode only if old rate is not supported
2365          * in current association (use new rate found above).
2366          */
2367         fail_count = window->counter - window->success_counter;
2368         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2369                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2370                 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2371                                "for index %d\n",
2372                                window->success_counter, window->counter, index);
2373
2374                 /* Can't calculate this yet; not enough history */
2375                 window->average_tpt = IWL_INVALID_VALUE;
2376
2377                 /* Should we stay with this modulation mode,
2378                  * or search for a new one? */
2379                 rs_stay_in_table(lq_sta, false);
2380
2381                 goto out;
2382         }
2383         /* Else we have enough samples; calculate estimate of
2384          * actual average throughput */
2385         if (window->average_tpt != ((window->success_ratio *
2386                         tbl->expected_tpt[index] + 64) / 128)) {
2387                 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2388                 window->average_tpt = ((window->success_ratio *
2389                                         tbl->expected_tpt[index] + 64) / 128);
2390         }
2391
2392         /* If we are searching for better modulation mode, check success. */
2393         if (lq_sta->search_better_tbl &&
2394             (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2395                 /* If good success, continue using the "search" mode;
2396                  * no need to send new link quality command, since we're
2397                  * continuing to use the setup that we've been trying. */
2398                 if (window->average_tpt > lq_sta->last_tpt) {
2399
2400                         IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2401                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2402                                         window->success_ratio,
2403                                         window->average_tpt,
2404                                         lq_sta->last_tpt);
2405
2406                         if (!is_legacy(tbl->lq_type))
2407                                 lq_sta->enable_counter = 1;
2408
2409                         /* Swap tables; "search" becomes "active" */
2410                         lq_sta->active_tbl = active_tbl;
2411                         current_tpt = window->average_tpt;
2412
2413                 /* Else poor success; go back to mode in "active" table */
2414                 } else {
2415
2416                         IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2417                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2418                                         window->success_ratio,
2419                                         window->average_tpt,
2420                                         lq_sta->last_tpt);
2421
2422                         /* Nullify "search" table */
2423                         tbl->lq_type = LQ_NONE;
2424
2425                         /* Revert to "active" table */
2426                         active_tbl = lq_sta->active_tbl;
2427                         tbl = &(lq_sta->lq_info[active_tbl]);
2428
2429                         /* Revert to "active" rate and throughput info */
2430                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2431                         current_tpt = lq_sta->last_tpt;
2432
2433                         /* Need to set up a new rate table in uCode */
2434                         update_lq = 1;
2435                 }
2436
2437                 /* Either way, we've made a decision; modulation mode
2438                  * search is done, allow rate adjustment next time. */
2439                 lq_sta->search_better_tbl = 0;
2440                 done_search = 1;        /* Don't switch modes below! */
2441                 goto lq_update;
2442         }
2443
2444         /* (Else) not in search of better modulation mode, try for better
2445          * starting rate, while staying in this mode. */
2446         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2447                                         tbl->lq_type);
2448         low = high_low & 0xff;
2449         high = (high_low >> 8) & 0xff;
2450
2451         /* If user set max rate, dont allow higher than user constrain */
2452         if ((lq_sta->max_rate_idx != -1) &&
2453             (lq_sta->max_rate_idx < high))
2454                 high = IWL_RATE_INVALID;
2455
2456         sr = window->success_ratio;
2457
2458         /* Collect measured throughputs for current and adjacent rates */
2459         current_tpt = window->average_tpt;
2460         if (low != IWL_RATE_INVALID)
2461                 low_tpt = tbl->win[low].average_tpt;
2462         if (high != IWL_RATE_INVALID)
2463                 high_tpt = tbl->win[high].average_tpt;
2464
2465         scale_action = 0;
2466
2467         /* Too many failures, decrease rate */
2468         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2469                 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2470                 scale_action = -1;
2471
2472         /* No throughput measured yet for adjacent rates; try increase. */
2473         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2474                    (high_tpt == IWL_INVALID_VALUE)) {
2475
2476                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2477                         scale_action = 1;
2478                 else if (low != IWL_RATE_INVALID)
2479                         scale_action = 0;
2480         }
2481
2482         /* Both adjacent throughputs are measured, but neither one has better
2483          * throughput; we're using the best rate, don't change it! */
2484         else if ((low_tpt != IWL_INVALID_VALUE) &&
2485                  (high_tpt != IWL_INVALID_VALUE) &&
2486                  (low_tpt < current_tpt) &&
2487                  (high_tpt < current_tpt))
2488                 scale_action = 0;
2489
2490         /* At least one adjacent rate's throughput is measured,
2491          * and may have better performance. */
2492         else {
2493                 /* Higher adjacent rate's throughput is measured */
2494                 if (high_tpt != IWL_INVALID_VALUE) {
2495                         /* Higher rate has better throughput */
2496                         if (high_tpt > current_tpt &&
2497                                         sr >= IWL_RATE_INCREASE_TH) {
2498                                 scale_action = 1;
2499                         } else {
2500                                 scale_action = 0;
2501                         }
2502
2503                 /* Lower adjacent rate's throughput is measured */
2504                 } else if (low_tpt != IWL_INVALID_VALUE) {
2505                         /* Lower rate has better throughput */
2506                         if (low_tpt > current_tpt) {
2507                                 IWL_DEBUG_RATE(priv,
2508                                     "decrease rate because of low tpt\n");
2509                                 scale_action = -1;
2510                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2511                                 scale_action = 1;
2512                         }
2513                 }
2514         }
2515
2516         /* Sanity check; asked for decrease, but success rate or throughput
2517          * has been good at old rate.  Don't change it. */
2518         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2519                     ((sr > IWL_RATE_HIGH_TH) ||
2520                      (current_tpt > (100 * tbl->expected_tpt[low]))))
2521                 scale_action = 0;
2522         if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2523                 scale_action = -1;
2524         if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2525                 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2526                 scale_action = -1;
2527
2528         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2529              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2530                 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2531                         /*
2532                          * don't set scale_action, don't want to scale up if
2533                          * the rate scale doesn't otherwise think that is a
2534                          * good idea.
2535                          */
2536                 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2537                         scale_action = -1;
2538                 }
2539         }
2540         lq_sta->last_bt_traffic = priv->bt_traffic_load;
2541
2542         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2543              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2544                 /* search for a new modulation */
2545                 rs_stay_in_table(lq_sta, true);
2546                 goto lq_update;
2547         }
2548
2549         switch (scale_action) {
2550         case -1:
2551                 /* Decrease starting rate, update uCode's rate table */
2552                 if (low != IWL_RATE_INVALID) {
2553                         update_lq = 1;
2554                         index = low;
2555                 }
2556
2557                 break;
2558         case 1:
2559                 /* Increase starting rate, update uCode's rate table */
2560                 if (high != IWL_RATE_INVALID) {
2561                         update_lq = 1;
2562                         index = high;
2563                 }
2564
2565                 break;
2566         case 0:
2567                 /* No change */
2568         default:
2569                 break;
2570         }
2571
2572         IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2573                     "high %d type %d\n",
2574                      index, scale_action, low, high, tbl->lq_type);
2575
2576 lq_update:
2577         /* Replace uCode's rate table for the destination station. */
2578         if (update_lq)
2579                 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2580
2581         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2582                 /* Should we stay with this modulation mode,
2583                  * or search for a new one? */
2584           rs_stay_in_table(lq_sta, false);
2585         }
2586         /*
2587          * Search for new modulation mode if we're:
2588          * 1)  Not changing rates right now
2589          * 2)  Not just finishing up a search
2590          * 3)  Allowing a new search
2591          */
2592         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2593                 /* Save current throughput to compare with "search" throughput*/
2594                 lq_sta->last_tpt = current_tpt;
2595
2596                 /* Select a new "search" modulation mode to try.
2597                  * If one is found, set up the new "search" table. */
2598                 if (is_legacy(tbl->lq_type))
2599                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2600                 else if (is_siso(tbl->lq_type))
2601                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2602                 else if (is_mimo2(tbl->lq_type))
2603                         rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2604                 else
2605                         rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2606
2607                 /* If new "search" mode was selected, set up in uCode table */
2608                 if (lq_sta->search_better_tbl) {
2609                         /* Access the "search" table, clear its history. */
2610                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2611                         for (i = 0; i < IWL_RATE_COUNT; i++)
2612                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2613
2614                         /* Use new "search" start rate */
2615                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2616
2617                         IWL_DEBUG_RATE(priv, "Switch current  mcs: %X index: %d\n",
2618                                      tbl->current_rate, index);
2619                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2620                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2621                 } else
2622                         done_search = 1;
2623         }
2624
2625         if (done_search && !lq_sta->stay_in_tbl) {
2626                 /* If the "active" (non-search) mode was legacy,
2627                  * and we've tried switching antennas,
2628                  * but we haven't been able to try HT modes (not available),
2629                  * stay with best antenna legacy modulation for a while
2630                  * before next round of mode comparisons. */
2631                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2632                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2633                     lq_sta->action_counter > tbl1->max_search) {
2634                         IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2635                         rs_set_stay_in_table(priv, 1, lq_sta);
2636                 }
2637
2638                 /* If we're in an HT mode, and all 3 mode switch actions
2639                  * have been tried and compared, stay in this best modulation
2640                  * mode for a while before next round of mode comparisons. */
2641                 if (lq_sta->enable_counter &&
2642                     (lq_sta->action_counter >= tbl1->max_search) &&
2643                     iwl_ht_enabled(priv)) {
2644                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2645                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2646                             (tid != MAX_TID_COUNT)) {
2647                                 tid_data =
2648                                    &priv->stations[lq_sta->lq.sta_id].tid[tid];
2649                                 if (tid_data->agg.state == IWL_AGG_OFF) {
2650                                         IWL_DEBUG_RATE(priv,
2651                                                        "try to aggregate tid %d\n",
2652                                                        tid);
2653                                         rs_tl_turn_on_agg(priv, tid,
2654                                                           lq_sta, sta);
2655                                 }
2656                         }
2657                         rs_set_stay_in_table(priv, 0, lq_sta);
2658                 }
2659         }
2660
2661 out:
2662         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2663         i = index;
2664         lq_sta->last_txrate_idx = i;
2665 }
2666
2667 /**
2668  * rs_initialize_lq - Initialize a station's hardware rate table
2669  *
2670  * The uCode's station table contains a table of fallback rates
2671  * for automatic fallback during transmission.
2672  *
2673  * NOTE: This sets up a default set of values.  These will be replaced later
2674  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2675  *       rc80211_simple.
2676  *
2677  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2678  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2679  *       which requires station table entry to exist).
2680  */
2681 static void rs_initialize_lq(struct iwl_priv *priv,
2682                              struct ieee80211_conf *conf,
2683                              struct ieee80211_sta *sta,
2684                              struct iwl_lq_sta *lq_sta)
2685 {
2686         struct iwl_scale_tbl_info *tbl;
2687         int rate_idx;
2688         int i;
2689         u32 rate;
2690         u8 use_green = rs_use_green(sta);
2691         u8 active_tbl = 0;
2692         u8 valid_tx_ant;
2693         struct iwl_station_priv *sta_priv;
2694         struct iwl_rxon_context *ctx;
2695
2696         if (!sta || !lq_sta)
2697                 return;
2698
2699         sta_priv = (void *)sta->drv_priv;
2700         ctx = sta_priv->common.ctx;
2701
2702         i = lq_sta->last_txrate_idx;
2703
2704         valid_tx_ant = priv->hw_params.valid_tx_ant;
2705
2706         if (!lq_sta->search_better_tbl)
2707                 active_tbl = lq_sta->active_tbl;
2708         else
2709                 active_tbl = 1 - lq_sta->active_tbl;
2710
2711         tbl = &(lq_sta->lq_info[active_tbl]);
2712
2713         if ((i < 0) || (i >= IWL_RATE_COUNT))
2714                 i = 0;
2715
2716         rate = iwl_rates[i].plcp;
2717         tbl->ant_type = first_antenna(valid_tx_ant);
2718         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2719
2720         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2721                 rate |= RATE_MCS_CCK_MSK;
2722
2723         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2724         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2725             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2726
2727         rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2728         tbl->current_rate = rate;
2729         rs_set_expected_tpt_table(lq_sta, tbl);
2730         rs_fill_link_cmd(NULL, lq_sta, rate);
2731         priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2732         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2733 }
2734
2735 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2736                         struct ieee80211_tx_rate_control *txrc)
2737 {
2738
2739         struct sk_buff *skb = txrc->skb;
2740         struct ieee80211_supported_band *sband = txrc->sband;
2741         struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2742         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2743         struct iwl_lq_sta *lq_sta = priv_sta;
2744         int rate_idx;
2745
2746         IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2747
2748         /* Get max rate if user set max rate */
2749         if (lq_sta) {
2750                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2751                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2752                     (lq_sta->max_rate_idx != -1))
2753                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2754                 if ((lq_sta->max_rate_idx < 0) ||
2755                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2756                         lq_sta->max_rate_idx = -1;
2757         }
2758
2759         /* Treat uninitialized rate scaling data same as non-existing. */
2760         if (lq_sta && !lq_sta->drv) {
2761                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2762                 priv_sta = NULL;
2763         }
2764
2765         /* Send management frames and NO_ACK data using lowest rate. */
2766         if (rate_control_send_low(sta, priv_sta, txrc))
2767                 return;
2768
2769         rate_idx  = lq_sta->last_txrate_idx;
2770
2771         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2772                 rate_idx -= IWL_FIRST_OFDM_RATE;
2773                 /* 6M and 9M shared same MCS index */
2774                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2775                 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2776                     IWL_RATE_MIMO3_6M_PLCP)
2777                         rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2778                 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2779                          IWL_RATE_MIMO2_6M_PLCP)
2780                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2781                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2782                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2783                         info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2784                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2785                         info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2786                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2787                         info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2788                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2789                         info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2790         } else {
2791                 /* Check for invalid rates */
2792                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2793                                 ((sband->band == IEEE80211_BAND_5GHZ) &&
2794                                  (rate_idx < IWL_FIRST_OFDM_RATE)))
2795                         rate_idx = rate_lowest_index(sband, sta);
2796                 /* On valid 5 GHz rate, adjust index */
2797                 else if (sband->band == IEEE80211_BAND_5GHZ)
2798                         rate_idx -= IWL_FIRST_OFDM_RATE;
2799                 info->control.rates[0].flags = 0;
2800         }
2801         info->control.rates[0].idx = rate_idx;
2802
2803 }
2804
2805 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2806                           gfp_t gfp)
2807 {
2808         struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2809         struct iwl_priv *priv;
2810
2811         priv = (struct iwl_priv *)priv_rate;
2812         IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2813
2814         return &sta_priv->lq_sta;
2815 }
2816
2817 /*
2818  * Called after adding a new station to initialize rate scaling
2819  */
2820 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2821 {
2822         int i, j;
2823         struct ieee80211_hw *hw = priv->hw;
2824         struct ieee80211_conf *conf = &priv->hw->conf;
2825         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2826         struct iwl_station_priv *sta_priv;
2827         struct iwl_lq_sta *lq_sta;
2828         struct ieee80211_supported_band *sband;
2829
2830         sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2831         lq_sta = &sta_priv->lq_sta;
2832         sband = hw->wiphy->bands[conf->channel->band];
2833
2834
2835         lq_sta->lq.sta_id = sta_id;
2836
2837         for (j = 0; j < LQ_SIZE; j++)
2838                 for (i = 0; i < IWL_RATE_COUNT; i++)
2839                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2840
2841         lq_sta->flush_timer = 0;
2842         lq_sta->supp_rates = sta->supp_rates[sband->band];
2843         for (j = 0; j < LQ_SIZE; j++)
2844                 for (i = 0; i < IWL_RATE_COUNT; i++)
2845                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2846
2847         IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2848                        sta_id);
2849         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2850          * the lowest or the highest rate.. Could consider using RSSI from
2851          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2852          * after assoc.. */
2853
2854         lq_sta->is_dup = 0;
2855         lq_sta->max_rate_idx = -1;
2856         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2857         lq_sta->is_green = rs_use_green(sta);
2858         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2859         lq_sta->band = priv->band;
2860         /*
2861          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2862          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2863          */
2864         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2865         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2866         lq_sta->active_siso_rate &= ~((u16)0x2);
2867         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2868
2869         /* Same here */
2870         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2871         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2872         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2873         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2874
2875         lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2876         lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2877         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2878         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2879
2880         IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2881                      lq_sta->active_siso_rate,
2882                      lq_sta->active_mimo2_rate,
2883                      lq_sta->active_mimo3_rate);
2884
2885         /* These values will be overridden later */
2886         lq_sta->lq.general_params.single_stream_ant_msk =
2887                 first_antenna(priv->hw_params.valid_tx_ant);
2888         lq_sta->lq.general_params.dual_stream_ant_msk =
2889                 priv->hw_params.valid_tx_ant &
2890                 ~first_antenna(priv->hw_params.valid_tx_ant);
2891         if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2892                 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2893         } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2894                 lq_sta->lq.general_params.dual_stream_ant_msk =
2895                         priv->hw_params.valid_tx_ant;
2896         }
2897
2898         /* as default allow aggregation for all tids */
2899         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2900         lq_sta->drv = priv;
2901
2902         /* Set last_txrate_idx to lowest rate */
2903         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2904         if (sband->band == IEEE80211_BAND_5GHZ)
2905                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2906         lq_sta->is_agg = 0;
2907
2908         priv->tm_fixed_rate = 0;
2909 #ifdef CONFIG_MAC80211_DEBUGFS
2910         lq_sta->dbg_fixed_rate = 0;
2911 #endif
2912
2913         rs_initialize_lq(priv, conf, sta, lq_sta);
2914 }
2915
2916 static void rs_fill_link_cmd(struct iwl_priv *priv,
2917                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2918 {
2919         struct iwl_scale_tbl_info tbl_type;
2920         int index = 0;
2921         int rate_idx;
2922         int repeat_rate = 0;
2923         u8 ant_toggle_cnt = 0;
2924         u8 use_ht_possible = 1;
2925         u8 valid_tx_ant = 0;
2926         struct iwl_station_priv *sta_priv =
2927                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2928         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2929
2930         /* Override starting rate (index 0) if needed for debug purposes */
2931         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2932
2933         /* Interpret new_rate (rate_n_flags) */
2934         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2935                                   &tbl_type, &rate_idx);
2936
2937         if (priv && priv->bt_full_concurrent) {
2938                 /* 1x1 only */
2939                 tbl_type.ant_type =
2940                         first_antenna(priv->hw_params.valid_tx_ant);
2941         }
2942
2943         /* How many times should we repeat the initial rate? */
2944         if (is_legacy(tbl_type.lq_type)) {
2945                 ant_toggle_cnt = 1;
2946                 repeat_rate = IWL_NUMBER_TRY;
2947         } else {
2948                 repeat_rate = min(IWL_HT_NUMBER_TRY,
2949                                   LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2950         }
2951
2952         lq_cmd->general_params.mimo_delimiter =
2953                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2954
2955         /* Fill 1st table entry (index 0) */
2956         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2957
2958         if (num_of_ant(tbl_type.ant_type) == 1) {
2959                 lq_cmd->general_params.single_stream_ant_msk =
2960                                                 tbl_type.ant_type;
2961         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2962                 lq_cmd->general_params.dual_stream_ant_msk =
2963                                                 tbl_type.ant_type;
2964         } /* otherwise we don't modify the existing value */
2965
2966         index++;
2967         repeat_rate--;
2968         if (priv) {
2969                 if (priv->bt_full_concurrent)
2970                         valid_tx_ant = ANT_A;
2971                 else
2972                         valid_tx_ant = priv->hw_params.valid_tx_ant;
2973         }
2974
2975         /* Fill rest of rate table */
2976         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2977                 /* Repeat initial/next rate.
2978                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2979                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2980                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2981                         if (is_legacy(tbl_type.lq_type)) {
2982                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2983                                         ant_toggle_cnt++;
2984                                 else if (priv &&
2985                                          rs_toggle_antenna(valid_tx_ant,
2986                                                         &new_rate, &tbl_type))
2987                                         ant_toggle_cnt = 1;
2988                         }
2989
2990                         /* Override next rate if needed for debug purposes */
2991                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2992
2993                         /* Fill next table entry */
2994                         lq_cmd->rs_table[index].rate_n_flags =
2995                                         cpu_to_le32(new_rate);
2996                         repeat_rate--;
2997                         index++;
2998                 }
2999
3000                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
3001                                                 &rate_idx);
3002
3003                 if (priv && priv->bt_full_concurrent) {
3004                         /* 1x1 only */
3005                         tbl_type.ant_type =
3006                                 first_antenna(priv->hw_params.valid_tx_ant);
3007                 }
3008
3009                 /* Indicate to uCode which entries might be MIMO.
3010                  * If initial rate was MIMO, this will finally end up
3011                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
3012                 if (is_mimo(tbl_type.lq_type))
3013                         lq_cmd->general_params.mimo_delimiter = index;
3014
3015                 /* Get next rate */
3016                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3017                                              use_ht_possible);
3018
3019                 /* How many times should we repeat the next rate? */
3020                 if (is_legacy(tbl_type.lq_type)) {
3021                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3022                                 ant_toggle_cnt++;
3023                         else if (priv &&
3024                                  rs_toggle_antenna(valid_tx_ant,
3025                                                    &new_rate, &tbl_type))
3026                                 ant_toggle_cnt = 1;
3027
3028                         repeat_rate = IWL_NUMBER_TRY;
3029                 } else {
3030                         repeat_rate = IWL_HT_NUMBER_TRY;
3031                 }
3032
3033                 /* Don't allow HT rates after next pass.
3034                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3035                 use_ht_possible = 0;
3036
3037                 /* Override next rate if needed for debug purposes */
3038                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3039
3040                 /* Fill next table entry */
3041                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3042
3043                 index++;
3044                 repeat_rate--;
3045         }
3046
3047         lq_cmd->agg_params.agg_frame_cnt_limit =
3048                 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3049         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3050
3051         lq_cmd->agg_params.agg_time_limit =
3052                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3053         /*
3054          * overwrite if needed, pass aggregation time limit
3055          * to uCode in uSec
3056          */
3057         if (priv && priv->cfg->bt_params &&
3058             priv->cfg->bt_params->agg_time_limit &&
3059             priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3060                 lq_cmd->agg_params.agg_time_limit =
3061                         cpu_to_le16(priv->cfg->bt_params->agg_time_limit);
3062 }
3063
3064 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3065 {
3066         return hw->priv;
3067 }
3068 /* rate scale requires free function to be implemented */
3069 static void rs_free(void *priv_rate)
3070 {
3071         return;
3072 }
3073
3074 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3075                         void *priv_sta)
3076 {
3077         struct iwl_priv *priv __maybe_unused = priv_r;
3078
3079         IWL_DEBUG_RATE(priv, "enter\n");
3080         IWL_DEBUG_RATE(priv, "leave\n");
3081 }
3082
3083 #ifdef CONFIG_MAC80211_DEBUGFS
3084 static int open_file_generic(struct inode *inode, struct file *file)
3085 {
3086         file->private_data = inode->i_private;
3087         return 0;
3088 }
3089 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3090                              u32 *rate_n_flags, int index)
3091 {
3092         struct iwl_priv *priv;
3093         u8 valid_tx_ant;
3094         u8 ant_sel_tx;
3095
3096         priv = lq_sta->drv;
3097         valid_tx_ant = priv->hw_params.valid_tx_ant;
3098         if (lq_sta->dbg_fixed_rate) {
3099                 ant_sel_tx =
3100                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3101                   >> RATE_MCS_ANT_POS);
3102                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3103                         *rate_n_flags = lq_sta->dbg_fixed_rate;
3104                         IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3105                 } else {
3106                         lq_sta->dbg_fixed_rate = 0;
3107                         IWL_ERR(priv,
3108                             "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3109                             ant_sel_tx, valid_tx_ant);
3110                         IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3111                 }
3112         } else {
3113                 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3114         }
3115 }
3116
3117 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3118                         const char __user *user_buf, size_t count, loff_t *ppos)
3119 {
3120         struct iwl_lq_sta *lq_sta = file->private_data;
3121         struct iwl_priv *priv;
3122         char buf[64];
3123         size_t buf_size;
3124         u32 parsed_rate;
3125
3126
3127         priv = lq_sta->drv;
3128         memset(buf, 0, sizeof(buf));
3129         buf_size = min(count, sizeof(buf) -  1);
3130         if (copy_from_user(buf, user_buf, buf_size))
3131                 return -EFAULT;
3132
3133         if (sscanf(buf, "%x", &parsed_rate) == 1)
3134                 lq_sta->dbg_fixed_rate = parsed_rate;
3135         else
3136                 lq_sta->dbg_fixed_rate = 0;
3137
3138         rs_program_fix_rate(priv, lq_sta);
3139
3140         return count;
3141 }
3142
3143 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3144                         char __user *user_buf, size_t count, loff_t *ppos)
3145 {
3146         char *buff;
3147         int desc = 0;
3148         int i = 0;
3149         int index = 0;
3150         ssize_t ret;
3151
3152         struct iwl_lq_sta *lq_sta = file->private_data;
3153         struct iwl_priv *priv;
3154         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3155
3156         priv = lq_sta->drv;
3157         buff = kmalloc(1024, GFP_KERNEL);
3158         if (!buff)
3159                 return -ENOMEM;
3160
3161         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3162         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3163                         lq_sta->total_failed, lq_sta->total_success,
3164                         lq_sta->active_legacy_rate);
3165         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3166                         lq_sta->dbg_fixed_rate);
3167         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3168             (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
3169             (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
3170             (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
3171         desc += sprintf(buff+desc, "lq type %s\n",
3172            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3173         if (is_Ht(tbl->lq_type)) {
3174                 desc += sprintf(buff+desc, " %s",
3175                    (is_siso(tbl->lq_type)) ? "SISO" :
3176                    ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3177                    desc += sprintf(buff+desc, " %s",
3178                    (tbl->is_ht40) ? "40MHz" : "20MHz");
3179                    desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3180                    (lq_sta->is_green) ? "GF enabled" : "",
3181                    (lq_sta->is_agg) ? "AGG on" : "");
3182         }
3183         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3184                 lq_sta->last_rate_n_flags);
3185         desc += sprintf(buff+desc, "general:"
3186                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3187                 lq_sta->lq.general_params.flags,
3188                 lq_sta->lq.general_params.mimo_delimiter,
3189                 lq_sta->lq.general_params.single_stream_ant_msk,
3190                 lq_sta->lq.general_params.dual_stream_ant_msk);
3191
3192         desc += sprintf(buff+desc, "agg:"
3193                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3194                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3195                         lq_sta->lq.agg_params.agg_dis_start_th,
3196                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
3197
3198         desc += sprintf(buff+desc,
3199                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3200                         lq_sta->lq.general_params.start_rate_index[0],
3201                         lq_sta->lq.general_params.start_rate_index[1],
3202                         lq_sta->lq.general_params.start_rate_index[2],
3203                         lq_sta->lq.general_params.start_rate_index[3]);
3204
3205         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3206                 index = iwl_hwrate_to_plcp_idx(
3207                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3208                 if (is_legacy(tbl->lq_type)) {
3209                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3210                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3211                                 iwl_rate_mcs[index].mbps);
3212                 } else {
3213                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3214                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3215                                 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3216                 }
3217         }
3218
3219         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3220         kfree(buff);
3221         return ret;
3222 }
3223
3224 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3225         .write = rs_sta_dbgfs_scale_table_write,
3226         .read = rs_sta_dbgfs_scale_table_read,
3227         .open = open_file_generic,
3228         .llseek = default_llseek,
3229 };
3230 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3231                         char __user *user_buf, size_t count, loff_t *ppos)
3232 {
3233         char *buff;
3234         int desc = 0;
3235         int i, j;
3236         ssize_t ret;
3237
3238         struct iwl_lq_sta *lq_sta = file->private_data;
3239
3240         buff = kmalloc(1024, GFP_KERNEL);
3241         if (!buff)
3242                 return -ENOMEM;
3243
3244         for (i = 0; i < LQ_SIZE; i++) {
3245                 desc += sprintf(buff+desc,
3246                                 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3247                                 "rate=0x%X\n",
3248                                 lq_sta->active_tbl == i ? "*" : "x",
3249                                 lq_sta->lq_info[i].lq_type,
3250                                 lq_sta->lq_info[i].is_SGI,
3251                                 lq_sta->lq_info[i].is_ht40,
3252                                 lq_sta->lq_info[i].is_dup,
3253                                 lq_sta->is_green,
3254                                 lq_sta->lq_info[i].current_rate);
3255                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3256                         desc += sprintf(buff+desc,
3257                                 "counter=%d success=%d %%=%d\n",
3258                                 lq_sta->lq_info[i].win[j].counter,
3259                                 lq_sta->lq_info[i].win[j].success_counter,
3260                                 lq_sta->lq_info[i].win[j].success_ratio);
3261                 }
3262         }
3263         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3264         kfree(buff);
3265         return ret;
3266 }
3267
3268 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3269         .read = rs_sta_dbgfs_stats_table_read,
3270         .open = open_file_generic,
3271         .llseek = default_llseek,
3272 };
3273
3274 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3275                         char __user *user_buf, size_t count, loff_t *ppos)
3276 {
3277         struct iwl_lq_sta *lq_sta = file->private_data;
3278         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3279         char buff[120];
3280         int desc = 0;
3281
3282         if (is_Ht(tbl->lq_type))
3283                 desc += sprintf(buff+desc,
3284                                 "Bit Rate= %d Mb/s\n",
3285                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3286         else
3287                 desc += sprintf(buff+desc,
3288                                 "Bit Rate= %d Mb/s\n",
3289                                 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3290
3291         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3292 }
3293
3294 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3295         .read = rs_sta_dbgfs_rate_scale_data_read,
3296         .open = open_file_generic,
3297         .llseek = default_llseek,
3298 };
3299
3300 static void rs_add_debugfs(void *priv, void *priv_sta,
3301                                         struct dentry *dir)
3302 {
3303         struct iwl_lq_sta *lq_sta = priv_sta;
3304         lq_sta->rs_sta_dbgfs_scale_table_file =
3305                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3306                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3307         lq_sta->rs_sta_dbgfs_stats_table_file =
3308                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3309                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
3310         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3311                 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3312                         lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3313         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3314                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3315                 &lq_sta->tx_agg_tid_en);
3316
3317 }
3318
3319 static void rs_remove_debugfs(void *priv, void *priv_sta)
3320 {
3321         struct iwl_lq_sta *lq_sta = priv_sta;
3322         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3323         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3324         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3325         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3326 }
3327 #endif
3328
3329 /*
3330  * Initialization of rate scaling information is done by driver after
3331  * the station is added. Since mac80211 calls this function before a
3332  * station is added we ignore it.
3333  */
3334 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3335                          struct ieee80211_sta *sta, void *priv_sta)
3336 {
3337 }
3338 static struct rate_control_ops rs_ops = {
3339         .module = NULL,
3340         .name = RS_NAME,
3341         .tx_status = rs_tx_status,
3342         .get_rate = rs_get_rate,
3343         .rate_init = rs_rate_init_stub,
3344         .alloc = rs_alloc,
3345         .free = rs_free,
3346         .alloc_sta = rs_alloc_sta,
3347         .free_sta = rs_free_sta,
3348 #ifdef CONFIG_MAC80211_DEBUGFS
3349         .add_sta_debugfs = rs_add_debugfs,
3350         .remove_sta_debugfs = rs_remove_debugfs,
3351 #endif
3352 };
3353
3354 int iwlagn_rate_control_register(void)
3355 {
3356         return ieee80211_rate_control_register(&rs_ops);
3357 }
3358
3359 void iwlagn_rate_control_unregister(void)
3360 {
3361         ieee80211_rate_control_unregister(&rs_ops);
3362 }
3363