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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2012 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/slab.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37
  38 #include "dev.h"
  39 #include "agn.h"
  40
  41 #define RS_NAME "iwl-agn-rs"
  42
  43 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  44 #define IWL_NUMBER_TRY      1
  45 #define IWL_HT_NUMBER_TRY   3
  46
  47 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  48 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  49 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  50
  51 /* max allowed rate miss before sync LQ cmd */
  52 #define IWL_MISSED_RATE_MAX             15
  53 /* max time to accum history 2 seconds */
  54 #define IWL_RATE_SCALE_FLUSH_INTVL   (3*HZ)
  55
  56 static u8 rs_ht_to_legacy[] = {
  57         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  58         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  59         IWL_RATE_6M_INDEX,
  60         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  61         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  62         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  63         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  64 };
  65
  66 static const u8 ant_toggle_lookup[] = {
  67         /*ANT_NONE -> */ ANT_NONE,
  68         /*ANT_A    -> */ ANT_B,
  69         /*ANT_B    -> */ ANT_C,
  70         /*ANT_AB   -> */ ANT_BC,
  71         /*ANT_C    -> */ ANT_A,
  72         /*ANT_AC   -> */ ANT_AB,
  73         /*ANT_BC   -> */ ANT_AC,
  74         /*ANT_ABC  -> */ ANT_ABC,
  75 };
  76
  77 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
  78         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
  79                                     IWL_RATE_SISO_##s##M_PLCP, \
  80                                     IWL_RATE_MIMO2_##s##M_PLCP,\
  81                                     IWL_RATE_MIMO3_##s##M_PLCP,\
  82                                     IWL_RATE_##r##M_IEEE,      \
  83                                     IWL_RATE_##ip##M_INDEX,    \
  84                                     IWL_RATE_##in##M_INDEX,    \
  85                                     IWL_RATE_##rp##M_INDEX,    \
  86                                     IWL_RATE_##rn##M_INDEX,    \
  87                                     IWL_RATE_##pp##M_INDEX,    \
  88                                     IWL_RATE_##np##M_INDEX }
  89
  90 /*
  91  * Parameter order:
  92  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
  93  *
  94  * If there isn't a valid next or previous rate then INV is used which
  95  * maps to IWL_RATE_INVALID
  96  *
  97  */
  98 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
  99         IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),    /*  1mbps */
 100         IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
 101         IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
 102         IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
 103         IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
 104         IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
 105         IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
 106         IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
 107         IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
 108         IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
 109         IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
 110         IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
 111         IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
 112         /* FIXME:RS:          ^^    should be INV (legacy) */
 113 };
 114
 115 static inline u8 rs_extract_rate(u32 rate_n_flags)
 116 {
 117         return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
 118 }
 119
 120 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 121 {
 122         int idx = 0;
 123
 124         /* HT rate format */
 125         if (rate_n_flags & RATE_MCS_HT_MSK) {
 126                 idx = rs_extract_rate(rate_n_flags);
 127
 128                 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
 129                         idx = idx - IWL_RATE_MIMO3_6M_PLCP;
 130                 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
 131                         idx = idx - IWL_RATE_MIMO2_6M_PLCP;
 132
 133                 idx += IWL_FIRST_OFDM_RATE;
 134                 /* skip 9M not supported in ht*/
 135                 if (idx >= IWL_RATE_9M_INDEX)
 136                         idx += 1;
 137                 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
 138                         return idx;
 139
 140         /* legacy rate format, search for match in table */
 141         } else {
 142                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 143                         if (iwl_rates[idx].plcp ==
 144                                         rs_extract_rate(rate_n_flags))
 145                                 return idx;
 146         }
 147
 148         return -1;
 149 }
 150
 151 static void rs_rate_scale_perform(struct iwl_priv *priv,
 152                                    struct sk_buff *skb,
 153                                    struct ieee80211_sta *sta,
 154                                    struct iwl_lq_sta *lq_sta);
 155 static void rs_fill_link_cmd(struct iwl_priv *priv,
 156                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 157 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 158
 159
 160 #ifdef CONFIG_MAC80211_DEBUGFS
 161 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 162                              u32 *rate_n_flags, int index);
 163 #else
 164 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 165                              u32 *rate_n_flags, int index)
 166 {}
 167 #endif
 168
 169 /**
 170  * The following tables contain the expected throughput metrics for all rates
 171  *
 172  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 173  *
 174  * where invalid entries are zeros.
 175  *
 176  * CCK rates are only valid in legacy table and will only be used in G
 177  * (2.4 GHz) band.
 178  */
 179
 180 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
 181         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 182 };
 183
 184 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
 185         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202}, /* Norm */
 186         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210}, /* SGI */
 187         {0, 0, 0, 0, 47, 0,  91, 133, 171, 242, 305, 334, 362}, /* AGG */
 188         {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
 189 };
 190
 191 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
 192         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 193         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 194         {0, 0, 0, 0,  94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
 195         {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
 196 };
 197
 198 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 199         {0, 0, 0, 0,  74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
 200         {0, 0, 0, 0,  81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
 201         {0, 0, 0, 0,  89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
 202         {0, 0, 0, 0,  97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
 203 };
 204
 205 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 206         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
 207         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
 208         {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
 209         {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
 210 };
 211
 212 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
 213         {0, 0, 0, 0,  99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
 214         {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
 215         {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
 216         {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
 217 };
 218
 219 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
 220         {0, 0, 0, 0, 152, 0, 211, 239, 255, 279,  290,  294,  297}, /* Norm */
 221         {0, 0, 0, 0, 160, 0, 219, 245, 261, 284,  294,  297,  300}, /* SGI */
 222         {0, 0, 0, 0, 254, 0, 443, 584, 695, 868,  984, 1030, 1070}, /* AGG */
 223         {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
 224 };
 225
 226 /* mbps, mcs */
 227 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 228         {  "1", "BPSK DSSS"},
 229         {  "2", "QPSK DSSS"},
 230         {"5.5", "BPSK CCK"},
 231         { "11", "QPSK CCK"},
 232         {  "6", "BPSK 1/2"},
 233         {  "9", "BPSK 1/2"},
 234         { "12", "QPSK 1/2"},
 235         { "18", "QPSK 3/4"},
 236         { "24", "16QAM 1/2"},
 237         { "36", "16QAM 3/4"},
 238         { "48", "64QAM 2/3"},
 239         { "54", "64QAM 3/4"},
 240         { "60", "64QAM 5/6"},
 241 };
 242
 243 #define MCS_INDEX_PER_STREAM    (8)
 244
 245 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 246 {
 247         window->data = 0;
 248         window->success_counter = 0;
 249         window->success_ratio = IWL_INVALID_VALUE;
 250         window->counter = 0;
 251         window->average_tpt = IWL_INVALID_VALUE;
 252         window->stamp = 0;
 253 }
 254
 255 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 256 {
 257         return (ant_type & valid_antenna) == ant_type;
 258 }
 259
 260 /*
 261  *      removes the old data from the statistics. All data that is older than
 262  *      TID_MAX_TIME_DIFF, will be deleted.
 263  */
 264 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 265 {
 266         /* The oldest age we want to keep */
 267         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 268
 269         while (tl->queue_count &&
 270                (tl->time_stamp < oldest_time)) {
 271                 tl->total -= tl->packet_count[tl->head];
 272                 tl->packet_count[tl->head] = 0;
 273                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 274                 tl->queue_count--;
 275                 tl->head++;
 276                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 277                         tl->head = 0;
 278         }
 279 }
 280
 281 /*
 282  *      increment traffic load value for tid and also remove
 283  *      any old values if passed the certain time period
 284  */
 285 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 286                            struct ieee80211_hdr *hdr)
 287 {
 288         u32 curr_time = jiffies_to_msecs(jiffies);
 289         u32 time_diff;
 290         s32 index;
 291         struct iwl_traffic_load *tl = NULL;
 292         u8 tid;
 293
 294         if (ieee80211_is_data_qos(hdr->frame_control)) {
 295                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 296                 tid = qc[0] & 0xf;
 297         } else
 298                 return IWL_MAX_TID_COUNT;
 299
 300         if (unlikely(tid >= IWL_MAX_TID_COUNT))
 301                 return IWL_MAX_TID_COUNT;
 302
 303         tl = &lq_data->load[tid];
 304
 305         curr_time -= curr_time % TID_ROUND_VALUE;
 306
 307         /* Happens only for the first packet. Initialize the data */
 308         if (!(tl->queue_count)) {
 309                 tl->total = 1;
 310                 tl->time_stamp = curr_time;
 311                 tl->queue_count = 1;
 312                 tl->head = 0;
 313                 tl->packet_count[0] = 1;
 314                 return IWL_MAX_TID_COUNT;
 315         }
 316
 317         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 318         index = time_diff / TID_QUEUE_CELL_SPACING;
 319
 320         /* The history is too long: remove data that is older than */
 321         /* TID_MAX_TIME_DIFF */
 322         if (index >= TID_QUEUE_MAX_SIZE)
 323                 rs_tl_rm_old_stats(tl, curr_time);
 324
 325         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 326         tl->packet_count[index] = tl->packet_count[index] + 1;
 327         tl->total = tl->total + 1;
 328
 329         if ((index + 1) > tl->queue_count)
 330                 tl->queue_count = index + 1;
 331
 332         return tid;
 333 }
 334
 335 #ifdef CONFIG_MAC80211_DEBUGFS
 336 /**
 337  * Program the device to use fixed rate for frame transmit
 338  * This is for debugging/testing only
 339  * once the device start use fixed rate, we need to reload the module
 340  * to being back the normal operation.
 341  */
 342 static void rs_program_fix_rate(struct iwl_priv *priv,
 343                                 struct iwl_lq_sta *lq_sta)
 344 {
 345         struct iwl_station_priv *sta_priv =
 346                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
 347         struct iwl_rxon_context *ctx = sta_priv->ctx;
 348
 349         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
 350         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 351         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 352         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 353
 354 #ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE
 355         /* testmode has higher priority to overwirte the fixed rate */
 356         if (priv->tm_fixed_rate)
 357                 lq_sta->dbg_fixed_rate = priv->tm_fixed_rate;
 358 #endif
 359
 360         IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
 361                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
 362
 363         if (lq_sta->dbg_fixed_rate) {
 364                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
 365                 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
 366                                 false);
 367         }
 368 }
 369 #endif
 370
 371 /*
 372         get the traffic load value for tid
 373 */
 374 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 375 {
 376         u32 curr_time = jiffies_to_msecs(jiffies);
 377         u32 time_diff;
 378         s32 index;
 379         struct iwl_traffic_load *tl = NULL;
 380
 381         if (tid >= IWL_MAX_TID_COUNT)
 382                 return 0;
 383
 384         tl = &(lq_data->load[tid]);
 385
 386         curr_time -= curr_time % TID_ROUND_VALUE;
 387
 388         if (!(tl->queue_count))
 389                 return 0;
 390
 391         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 392         index = time_diff / TID_QUEUE_CELL_SPACING;
 393
 394         /* The history is too long: remove data that is older than */
 395         /* TID_MAX_TIME_DIFF */
 396         if (index >= TID_QUEUE_MAX_SIZE)
 397                 rs_tl_rm_old_stats(tl, curr_time);
 398
 399         return tl->total;
 400 }
 401
 402 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 403                                       struct iwl_lq_sta *lq_data, u8 tid,
 404                                       struct ieee80211_sta *sta)
 405 {
 406         int ret = -EAGAIN;
 407         u32 load;
 408
 409         /*
 410          * Don't create TX aggregation sessions when in high
 411          * BT traffic, as they would just be disrupted by BT.
 412          */
 413         if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
 414                 IWL_ERR(priv, "BT traffic (%d), no aggregation allowed\n",
 415                         priv->bt_traffic_load);
 416                 return ret;
 417         }
 418
 419         load = rs_tl_get_load(lq_data, tid);
 420
 421         if ((iwlwifi_mod_params.auto_agg) || (load > IWL_AGG_LOAD_THRESHOLD)) {
 422                 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
 423                                 sta->addr, tid);
 424                 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 425                 if (ret == -EAGAIN) {
 426                         /*
 427                          * driver and mac80211 is out of sync
 428                          * this might be cause by reloading firmware
 429                          * stop the tx ba session here
 430                          */
 431                         IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
 432                                 tid);
 433                         ieee80211_stop_tx_ba_session(sta, tid);
 434                 }
 435         } else {
 436                 IWL_DEBUG_HT(priv, "Aggregation not enabled for tid %d "
 437                         "because load = %u\n", tid, load);
 438         }
 439         return ret;
 440 }
 441
 442 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 443                               struct iwl_lq_sta *lq_data,
 444                               struct ieee80211_sta *sta)
 445 {
 446         if (tid < IWL_MAX_TID_COUNT)
 447                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 448         else
 449                 IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n",
 450                         tid, IWL_MAX_TID_COUNT);
 451 }
 452
 453 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 454 {
 455         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 456                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 457                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 458 }
 459
 460 /*
 461  * Static function to get the expected throughput from an iwl_scale_tbl_info
 462  * that wraps a NULL pointer check
 463  */
 464 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 465 {
 466         if (tbl->expected_tpt)
 467                 return tbl->expected_tpt[rs_index];
 468         return 0;
 469 }
 470
 471 /**
 472  * rs_collect_tx_data - Update the success/failure sliding window
 473  *
 474  * We keep a sliding window of the last 62 packets transmitted
 475  * at this rate.  window->data contains the bitmask of successful
 476  * packets.
 477  */
 478 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 479                               int scale_index, int attempts, int successes)
 480 {
 481         struct iwl_rate_scale_data *window = NULL;
 482         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 483         s32 fail_count, tpt;
 484
 485         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 486                 return -EINVAL;
 487
 488         /* Select window for current tx bit rate */
 489         window = &(tbl->win[scale_index]);
 490
 491         /* Get expected throughput */
 492         tpt = get_expected_tpt(tbl, scale_index);
 493
 494         /*
 495          * Keep track of only the latest 62 tx frame attempts in this rate's
 496          * history window; anything older isn't really relevant any more.
 497          * If we have filled up the sliding window, drop the oldest attempt;
 498          * if the oldest attempt (highest bit in bitmap) shows "success",
 499          * subtract "1" from the success counter (this is the main reason
 500          * we keep these bitmaps!).
 501          */
 502         while (attempts > 0) {
 503                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 504
 505                         /* remove earliest */
 506                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 507
 508                         if (window->data & mask) {
 509                                 window->data &= ~mask;
 510                                 window->success_counter--;
 511                         }
 512                 }
 513
 514                 /* Increment frames-attempted counter */
 515                 window->counter++;
 516
 517                 /* Shift bitmap by one frame to throw away oldest history */
 518                 window->data <<= 1;
 519
 520                 /* Mark the most recent #successes attempts as successful */
 521                 if (successes > 0) {
 522                         window->success_counter++;
 523                         window->data |= 0x1;
 524                         successes--;
 525                 }
 526
 527                 attempts--;
 528         }
 529
 530         /* Calculate current success ratio, avoid divide-by-0! */
 531         if (window->counter > 0)
 532                 window->success_ratio = 128 * (100 * window->success_counter)
 533                                         / window->counter;
 534         else
 535                 window->success_ratio = IWL_INVALID_VALUE;
 536
 537         fail_count = window->counter - window->success_counter;
 538
 539         /* Calculate average throughput, if we have enough history. */
 540         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 541             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 542                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 543         else
 544                 window->average_tpt = IWL_INVALID_VALUE;
 545
 546         /* Tag this window as having been updated */
 547         window->stamp = jiffies;
 548
 549         return 0;
 550 }
 551
 552 /*
 553  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 554  */
 555 /* FIXME:RS:remove this function and put the flags statically in the table */
 556 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
 557                                  struct iwl_scale_tbl_info *tbl,
 558                                  int index, u8 use_green)
 559 {
 560         u32 rate_n_flags = 0;
 561
 562         if (is_legacy(tbl->lq_type)) {
 563                 rate_n_flags = iwl_rates[index].plcp;
 564                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 565                         rate_n_flags |= RATE_MCS_CCK_MSK;
 566
 567         } else if (is_Ht(tbl->lq_type)) {
 568                 if (index > IWL_LAST_OFDM_RATE) {
 569                         IWL_ERR(priv, "Invalid HT rate index %d\n", index);
 570                         index = IWL_LAST_OFDM_RATE;
 571                 }
 572                 rate_n_flags = RATE_MCS_HT_MSK;
 573
 574                 if (is_siso(tbl->lq_type))
 575                         rate_n_flags |= iwl_rates[index].plcp_siso;
 576                 else if (is_mimo2(tbl->lq_type))
 577                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 578                 else
 579                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 580         } else {
 581                 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 582         }
 583
 584         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 585                                                      RATE_MCS_ANT_ABC_MSK);
 586
 587         if (is_Ht(tbl->lq_type)) {
 588                 if (tbl->is_ht40) {
 589                         if (tbl->is_dup)
 590                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 591                         else
 592                                 rate_n_flags |= RATE_MCS_HT40_MSK;
 593                 }
 594                 if (tbl->is_SGI)
 595                         rate_n_flags |= RATE_MCS_SGI_MSK;
 596
 597                 if (use_green) {
 598                         rate_n_flags |= RATE_MCS_GF_MSK;
 599                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 600                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 601                                 IWL_ERR(priv, "GF was set with SGI:SISO\n");
 602                         }
 603                 }
 604         }
 605         return rate_n_flags;
 606 }
 607
 608 /*
 609  * Interpret uCode API's rate_n_flags format,
 610  * fill "search" or "active" tx mode table.
 611  */
 612 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 613                                     enum ieee80211_band band,
 614                                     struct iwl_scale_tbl_info *tbl,
 615                                     int *rate_idx)
 616 {
 617         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 618         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 619         u8 mcs;
 620
 621         memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
 622         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 623
 624         if (*rate_idx  == IWL_RATE_INVALID) {
 625                 *rate_idx = -1;
 626                 return -EINVAL;
 627         }
 628         tbl->is_SGI = 0;        /* default legacy setup */
 629         tbl->is_ht40 = 0;
 630         tbl->is_dup = 0;
 631         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 632         tbl->lq_type = LQ_NONE;
 633         tbl->max_search = IWL_MAX_SEARCH;
 634
 635         /* legacy rate format */
 636         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 637                 if (num_of_ant == 1) {
 638                         if (band == IEEE80211_BAND_5GHZ)
 639                                 tbl->lq_type = LQ_A;
 640                         else
 641                                 tbl->lq_type = LQ_G;
 642                 }
 643         /* HT rate format */
 644         } else {
 645                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 646                         tbl->is_SGI = 1;
 647
 648                 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
 649                     (rate_n_flags & RATE_MCS_DUP_MSK))
 650                         tbl->is_ht40 = 1;
 651
 652                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 653                         tbl->is_dup = 1;
 654
 655                 mcs = rs_extract_rate(rate_n_flags);
 656
 657                 /* SISO */
 658                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 659                         if (num_of_ant == 1)
 660                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 661                 /* MIMO2 */
 662                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 663                         if (num_of_ant == 2)
 664                                 tbl->lq_type = LQ_MIMO2;
 665                 /* MIMO3 */
 666                 } else {
 667                         if (num_of_ant == 3) {
 668                                 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
 669                                 tbl->lq_type = LQ_MIMO3;
 670                         }
 671                 }
 672         }
 673         return 0;
 674 }
 675
 676 /* switch to another antenna/antennas and return 1 */
 677 /* if no other valid antenna found, return 0 */
 678 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 679                              struct iwl_scale_tbl_info *tbl)
 680 {
 681         u8 new_ant_type;
 682
 683         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 684                 return 0;
 685
 686         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 687                 return 0;
 688
 689         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 690
 691         while ((new_ant_type != tbl->ant_type) &&
 692                !rs_is_valid_ant(valid_ant, new_ant_type))
 693                 new_ant_type = ant_toggle_lookup[new_ant_type];
 694
 695         if (new_ant_type == tbl->ant_type)
 696                 return 0;
 697
 698         tbl->ant_type = new_ant_type;
 699         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 700         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 701         return 1;
 702 }
 703
 704 /**
 705  * Green-field mode is valid if the station supports it and
 706  * there are no non-GF stations present in the BSS.
 707  */
 708 static bool rs_use_green(struct ieee80211_sta *sta)
 709 {
 710         /*
 711          * There's a bug somewhere in this code that causes the
 712          * scaling to get stuck because GF+SGI can't be combined
 713          * in SISO rates. Until we find that bug, disable GF, it
 714          * has only limited benefit and we still interoperate with
 715          * GF APs since we can always receive GF transmissions.
 716          */
 717         return false;
 718 }
 719
 720 /**
 721  * rs_get_supported_rates - get the available rates
 722  *
 723  * if management frame or broadcast frame only return
 724  * basic available rates.
 725  *
 726  */
 727 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 728                                   struct ieee80211_hdr *hdr,
 729                                   enum iwl_table_type rate_type)
 730 {
 731         if (is_legacy(rate_type)) {
 732                 return lq_sta->active_legacy_rate;
 733         } else {
 734                 if (is_siso(rate_type))
 735                         return lq_sta->active_siso_rate;
 736                 else if (is_mimo2(rate_type))
 737                         return lq_sta->active_mimo2_rate;
 738                 else
 739                         return lq_sta->active_mimo3_rate;
 740         }
 741 }
 742
 743 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 744                                 int rate_type)
 745 {
 746         u8 high = IWL_RATE_INVALID;
 747         u8 low = IWL_RATE_INVALID;
 748
 749         /* 802.11A or ht walks to the next literal adjacent rate in
 750          * the rate table */
 751         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 752                 int i;
 753                 u32 mask;
 754
 755                 /* Find the previous rate that is in the rate mask */
 756                 i = index - 1;
 757                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 758                         if (rate_mask & mask) {
 759                                 low = i;
 760                                 break;
 761                         }
 762                 }
 763
 764                 /* Find the next rate that is in the rate mask */
 765                 i = index + 1;
 766                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 767                         if (rate_mask & mask) {
 768                                 high = i;
 769                                 break;
 770                         }
 771                 }
 772
 773                 return (high << 8) | low;
 774         }
 775
 776         low = index;
 777         while (low != IWL_RATE_INVALID) {
 778                 low = iwl_rates[low].prev_rs;
 779                 if (low == IWL_RATE_INVALID)
 780                         break;
 781                 if (rate_mask & (1 << low))
 782                         break;
 783                 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
 784         }
 785
 786         high = index;
 787         while (high != IWL_RATE_INVALID) {
 788                 high = iwl_rates[high].next_rs;
 789                 if (high == IWL_RATE_INVALID)
 790                         break;
 791                 if (rate_mask & (1 << high))
 792                         break;
 793                 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
 794         }
 795
 796         return (high << 8) | low;
 797 }
 798
 799 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 800                              struct iwl_scale_tbl_info *tbl,
 801                              u8 scale_index, u8 ht_possible)
 802 {
 803         s32 low;
 804         u16 rate_mask;
 805         u16 high_low;
 806         u8 switch_to_legacy = 0;
 807         u8 is_green = lq_sta->is_green;
 808         struct iwl_priv *priv = lq_sta->drv;
 809
 810         /* check if we need to switch from HT to legacy rates.
 811          * assumption is that mandatory rates (1Mbps or 6Mbps)
 812          * are always supported (spec demand) */
 813         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 814                 switch_to_legacy = 1;
 815                 scale_index = rs_ht_to_legacy[scale_index];
 816                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 817                         tbl->lq_type = LQ_A;
 818                 else
 819                         tbl->lq_type = LQ_G;
 820
 821                 if (num_of_ant(tbl->ant_type) > 1)
 822                         tbl->ant_type =
 823                             first_antenna(priv->eeprom_data->valid_tx_ant);
 824
 825                 tbl->is_ht40 = 0;
 826                 tbl->is_SGI = 0;
 827                 tbl->max_search = IWL_MAX_SEARCH;
 828         }
 829
 830         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 831
 832         /* Mask with station rate restriction */
 833         if (is_legacy(tbl->lq_type)) {
 834                 /* supp_rates has no CCK bits in A mode */
 835                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 836                         rate_mask  = (u16)(rate_mask &
 837                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 838                 else
 839                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 840         }
 841
 842         /* If we switched from HT to legacy, check current rate */
 843         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 844                 low = scale_index;
 845                 goto out;
 846         }
 847
 848         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 849                                         tbl->lq_type);
 850         low = high_low & 0xff;
 851
 852         if (low == IWL_RATE_INVALID)
 853                 low = scale_index;
 854
 855 out:
 856         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 857 }
 858
 859 /*
 860  * Simple function to compare two rate scale table types
 861  */
 862 static bool table_type_matches(struct iwl_scale_tbl_info *a,
 863                                struct iwl_scale_tbl_info *b)
 864 {
 865         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 866                 (a->is_SGI == b->is_SGI);
 867 }
 868
 869 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 870                             struct iwl_lq_sta *lq_sta)
 871 {
 872         struct iwl_scale_tbl_info *tbl;
 873         bool full_concurrent = priv->bt_full_concurrent;
 874
 875         if (priv->bt_ant_couple_ok) {
 876                 /*
 877                  * Is there a need to switch between
 878                  * full concurrency and 3-wire?
 879                  */
 880                 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
 881                         full_concurrent = true;
 882                 else
 883                         full_concurrent = false;
 884         }
 885         if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
 886             (priv->bt_full_concurrent != full_concurrent)) {
 887                 priv->bt_full_concurrent = full_concurrent;
 888                 priv->last_bt_traffic_load = priv->bt_traffic_load;
 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_op_mode *op_mode = (struct iwl_op_mode *)priv_r;
 913         struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
 914         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 915         enum mac80211_rate_control_flags mac_flags;
 916         u32 tx_rate;
 917         struct iwl_scale_tbl_info tbl_type;
 918         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 919         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 920         struct iwl_rxon_context *ctx = sta_priv->ctx;
 921
 922         IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
 923
 924         /* Treat uninitialized rate scaling data same as non-existing. */
 925         if (!lq_sta) {
 926                 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
 927                 return;
 928         } else if (!lq_sta->drv) {
 929                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
 930                 return;
 931         }
 932
 933         if (!ieee80211_is_data(hdr->frame_control) ||
 934             info->flags & IEEE80211_TX_CTL_NO_ACK)
 935                 return;
 936
 937         /* This packet was aggregated but doesn't carry status info */
 938         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 939             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 940                 return;
 941
 942         /*
 943          * Ignore this Tx frame response if its initial rate doesn't match
 944          * that of latest Link Quality command.  There may be stragglers
 945          * from a previous Link Quality command, but we're no longer interested
 946          * in those; they're either from the "active" mode while we're trying
 947          * to check "search" mode, or a prior "search" mode after we've moved
 948          * to a new "search" mode (which might become the new "active" mode).
 949          */
 950         table = &lq_sta->lq;
 951         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 952         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 953         if (priv->band == IEEE80211_BAND_5GHZ)
 954                 rs_index -= IWL_FIRST_OFDM_RATE;
 955         mac_flags = info->status.rates[0].flags;
 956         mac_index = info->status.rates[0].idx;
 957         /* For HT packets, map MCS to PLCP */
 958         if (mac_flags & IEEE80211_TX_RC_MCS) {
 959                 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
 960                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 961                         mac_index++;
 962                 /*
 963                  * mac80211 HT index is always zero-indexed; we need to move
 964                  * HT OFDM rates after CCK rates in 2.4 GHz band
 965                  */
 966                 if (priv->band == IEEE80211_BAND_2GHZ)
 967                         mac_index += IWL_FIRST_OFDM_RATE;
 968         }
 969         /* Here we actually compare this rate to the latest LQ command */
 970         if ((mac_index < 0) ||
 971             (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 972             (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 973             (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
 974             (tbl_type.ant_type != info->status.antenna) ||
 975             (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 976             (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 977             (rs_index != mac_index)) {
 978                 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
 979                 /*
 980                  * Since rates mis-match, the last LQ command may have failed.
 981                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 982                  * ... driver.
 983                  */
 984                 lq_sta->missed_rate_counter++;
 985                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 986                         lq_sta->missed_rate_counter = 0;
 987                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 988                 }
 989                 /* Regardless, ignore this status info for outdated rate */
 990                 return;
 991         } else
 992                 /* Rate did match, so reset the missed_rate_counter */
 993                 lq_sta->missed_rate_counter = 0;
 994
 995         /* Figure out if rate scale algorithm is in active or search table */
 996         if (table_type_matches(&tbl_type,
 997                                 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 998                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 999                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1000         } else if (table_type_matches(&tbl_type,
1001                                 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
1002                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1003                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1004         } else {
1005                 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
1006                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1007                 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
1008                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1009                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1010                 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1011                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1012                 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1013                         tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1014                 /*
1015                  * no matching table found, let's by-pass the data collection
1016                  * and continue to perform rate scale to find the rate table
1017                  */
1018                 rs_stay_in_table(lq_sta, true);
1019                 goto done;
1020         }
1021
1022         /*
1023          * Updating the frame history depends on whether packets were
1024          * aggregated.
1025          *
1026          * For aggregation, all packets were transmitted at the same rate, the
1027          * first index into rate scale table.
1028          */
1029         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1030                 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1031                 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1032                                 &rs_index);
1033                 rs_collect_tx_data(curr_tbl, rs_index,
1034                                    info->status.ampdu_len,
1035                                    info->status.ampdu_ack_len);
1036
1037                 /* Update success/fail counts if not searching for new mode */
1038                 if (lq_sta->stay_in_tbl) {
1039                         lq_sta->total_success += info->status.ampdu_ack_len;
1040                         lq_sta->total_failed += (info->status.ampdu_len -
1041                                         info->status.ampdu_ack_len);
1042                 }
1043         } else {
1044         /*
1045          * For legacy, update frame history with for each Tx retry.
1046          */
1047                 retries = info->status.rates[0].count - 1;
1048                 /* HW doesn't send more than 15 retries */
1049                 retries = min(retries, 15);
1050
1051                 /* The last transmission may have been successful */
1052                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1053                 /* Collect data for each rate used during failed TX attempts */
1054                 for (i = 0; i <= retries; ++i) {
1055                         tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1056                         rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1057                                         &tbl_type, &rs_index);
1058                         /*
1059                          * Only collect stats if retried rate is in the same RS
1060                          * table as active/search.
1061                          */
1062                         if (table_type_matches(&tbl_type, curr_tbl))
1063                                 tmp_tbl = curr_tbl;
1064                         else if (table_type_matches(&tbl_type, other_tbl))
1065                                 tmp_tbl = other_tbl;
1066                         else
1067                                 continue;
1068                         rs_collect_tx_data(tmp_tbl, rs_index, 1,
1069                                            i < retries ? 0 : legacy_success);
1070                 }
1071
1072                 /* Update success/fail counts if not searching for new mode */
1073                 if (lq_sta->stay_in_tbl) {
1074                         lq_sta->total_success += legacy_success;
1075                         lq_sta->total_failed += retries + (1 - legacy_success);
1076                 }
1077         }
1078         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1079         lq_sta->last_rate_n_flags = tx_rate;
1080 done:
1081         /* See if there's a better rate or modulation mode to try. */
1082         if (sta && sta->supp_rates[sband->band])
1083                 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1084
1085 #if defined(CONFIG_MAC80211_DEBUGFS) && defined(CONFIG_IWLWIFI_DEVICE_TESTMODE)
1086         if ((priv->tm_fixed_rate) &&
1087             (priv->tm_fixed_rate != lq_sta->dbg_fixed_rate))
1088                 rs_program_fix_rate(priv, lq_sta);
1089 #endif
1090         if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist)
1091                 rs_bt_update_lq(priv, ctx, lq_sta);
1092 }
1093
1094 /*
1095  * Begin a period of staying with a selected modulation mode.
1096  * Set "stay_in_tbl" flag to prevent any mode switches.
1097  * Set frame tx success limits according to legacy vs. high-throughput,
1098  * and reset overall (spanning all rates) tx success history statistics.
1099  * These control how long we stay using same modulation mode before
1100  * searching for a new mode.
1101  */
1102 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1103                                  struct iwl_lq_sta *lq_sta)
1104 {
1105         IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1106         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1107         if (is_legacy) {
1108                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1109                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1110                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1111         } else {
1112                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1113                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1114                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1115         }
1116         lq_sta->table_count = 0;
1117         lq_sta->total_failed = 0;
1118         lq_sta->total_success = 0;
1119         lq_sta->flush_timer = jiffies;
1120         lq_sta->action_counter = 0;
1121 }
1122
1123 /*
1124  * Find correct throughput table for given mode of modulation
1125  */
1126 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1127                                       struct iwl_scale_tbl_info *tbl)
1128 {
1129         /* Used to choose among HT tables */
1130         s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1131
1132         /* Check for invalid LQ type */
1133         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1134                 tbl->expected_tpt = expected_tpt_legacy;
1135                 return;
1136         }
1137
1138         /* Legacy rates have only one table */
1139         if (is_legacy(tbl->lq_type)) {
1140                 tbl->expected_tpt = expected_tpt_legacy;
1141                 return;
1142         }
1143
1144         /* Choose among many HT tables depending on number of streams
1145          * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1146          * status */
1147         if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1148                 ht_tbl_pointer = expected_tpt_siso20MHz;
1149         else if (is_siso(tbl->lq_type))
1150                 ht_tbl_pointer = expected_tpt_siso40MHz;
1151         else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1152                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1153         else if (is_mimo2(tbl->lq_type))
1154                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1155         else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1156                 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1157         else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1158                 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1159
1160         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
1161                 tbl->expected_tpt = ht_tbl_pointer[0];
1162         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1163                 tbl->expected_tpt = ht_tbl_pointer[1];
1164         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1165                 tbl->expected_tpt = ht_tbl_pointer[2];
1166         else                                            /* AGG+SGI */
1167                 tbl->expected_tpt = ht_tbl_pointer[3];
1168 }
1169
1170 /*
1171  * Find starting rate for new "search" high-throughput mode of modulation.
1172  * Goal is to find lowest expected rate (under perfect conditions) that is
1173  * above the current measured throughput of "active" mode, to give new mode
1174  * a fair chance to prove itself without too many challenges.
1175  *
1176  * This gets called when transitioning to more aggressive modulation
1177  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1178  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1179  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1180  * bit rate will typically need to increase, but not if performance was bad.
1181  */
1182 static s32 rs_get_best_rate(struct iwl_priv *priv,
1183                             struct iwl_lq_sta *lq_sta,
1184                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1185                             u16 rate_mask, s8 index)
1186 {
1187         /* "active" values */
1188         struct iwl_scale_tbl_info *active_tbl =
1189             &(lq_sta->lq_info[lq_sta->active_tbl]);
1190         s32 active_sr = active_tbl->win[index].success_ratio;
1191         s32 active_tpt = active_tbl->expected_tpt[index];
1192
1193         /* expected "search" throughput */
1194         s32 *tpt_tbl = tbl->expected_tpt;
1195
1196         s32 new_rate, high, low, start_hi;
1197         u16 high_low;
1198         s8 rate = index;
1199
1200         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1201
1202         for (; ;) {
1203                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1204                                                 tbl->lq_type);
1205
1206                 low = high_low & 0xff;
1207                 high = (high_low >> 8) & 0xff;
1208
1209                 /*
1210                  * Lower the "search" bit rate, to give new "search" mode
1211                  * approximately the same throughput as "active" if:
1212                  *
1213                  * 1) "Active" mode has been working modestly well (but not
1214                  *    great), and expected "search" throughput (under perfect
1215                  *    conditions) at candidate rate is above the actual
1216                  *    measured "active" throughput (but less than expected
1217                  *    "active" throughput under perfect conditions).
1218                  * OR
1219                  * 2) "Active" mode has been working perfectly or very well
1220                  *    and expected "search" throughput (under perfect
1221                  *    conditions) at candidate rate is above expected
1222                  *    "active" throughput (under perfect conditions).
1223                  */
1224                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1225                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1226                       (active_sr <= IWL_RATE_HIGH_TH) &&
1227                       (tpt_tbl[rate] <= active_tpt))) ||
1228                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1229                      (tpt_tbl[rate] > active_tpt))) {
1230
1231                         /* (2nd or later pass)
1232                          * If we've already tried to raise the rate, and are
1233                          * now trying to lower it, use the higher rate. */
1234                         if (start_hi != IWL_RATE_INVALID) {
1235                                 new_rate = start_hi;
1236                                 break;
1237                         }
1238
1239                         new_rate = rate;
1240
1241                         /* Loop again with lower rate */
1242                         if (low != IWL_RATE_INVALID)
1243                                 rate = low;
1244
1245                         /* Lower rate not available, use the original */
1246                         else
1247                                 break;
1248
1249                 /* Else try to raise the "search" rate to match "active" */
1250                 } else {
1251                         /* (2nd or later pass)
1252                          * If we've already tried to lower the rate, and are
1253                          * now trying to raise it, use the lower rate. */
1254                         if (new_rate != IWL_RATE_INVALID)
1255                                 break;
1256
1257                         /* Loop again with higher rate */
1258                         else if (high != IWL_RATE_INVALID) {
1259                                 start_hi = high;
1260                                 rate = high;
1261
1262                         /* Higher rate not available, use the original */
1263                         } else {
1264                                 new_rate = rate;
1265                                 break;
1266                         }
1267                 }
1268         }
1269
1270         return new_rate;
1271 }
1272
1273 /*
1274  * Set up search table for MIMO2
1275  */
1276 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1277                              struct iwl_lq_sta *lq_sta,
1278                              struct ieee80211_conf *conf,
1279                              struct ieee80211_sta *sta,
1280                              struct iwl_scale_tbl_info *tbl, int index)
1281 {
1282         u16 rate_mask;
1283         s32 rate;
1284         s8 is_green = lq_sta->is_green;
1285         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1286         struct iwl_rxon_context *ctx = sta_priv->ctx;
1287
1288         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1289                 return -1;
1290
1291         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1292                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1293                 return -1;
1294
1295         /* Need both Tx chains/antennas to support MIMO */
1296         if (priv->hw_params.tx_chains_num < 2)
1297                 return -1;
1298
1299         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1300
1301         tbl->lq_type = LQ_MIMO2;
1302         tbl->is_dup = lq_sta->is_dup;
1303         tbl->action = 0;
1304         tbl->max_search = IWL_MAX_SEARCH;
1305         rate_mask = lq_sta->active_mimo2_rate;
1306
1307         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1308                 tbl->is_ht40 = 1;
1309         else
1310                 tbl->is_ht40 = 0;
1311
1312         rs_set_expected_tpt_table(lq_sta, tbl);
1313
1314         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1315
1316         IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1317         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1318                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1319                                                 rate, rate_mask);
1320                 return -1;
1321         }
1322         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1323
1324         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1325                      tbl->current_rate, is_green);
1326         return 0;
1327 }
1328
1329 /*
1330  * Set up search table for MIMO3
1331  */
1332 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1333                              struct iwl_lq_sta *lq_sta,
1334                              struct ieee80211_conf *conf,
1335                              struct ieee80211_sta *sta,
1336                              struct iwl_scale_tbl_info *tbl, int index)
1337 {
1338         u16 rate_mask;
1339         s32 rate;
1340         s8 is_green = lq_sta->is_green;
1341         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1342         struct iwl_rxon_context *ctx = sta_priv->ctx;
1343
1344         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1345                 return -1;
1346
1347         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1348                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1349                 return -1;
1350
1351         /* Need both Tx chains/antennas to support MIMO */
1352         if (priv->hw_params.tx_chains_num < 3)
1353                 return -1;
1354
1355         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1356
1357         tbl->lq_type = LQ_MIMO3;
1358         tbl->is_dup = lq_sta->is_dup;
1359         tbl->action = 0;
1360         tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1361         rate_mask = lq_sta->active_mimo3_rate;
1362
1363         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1364                 tbl->is_ht40 = 1;
1365         else
1366                 tbl->is_ht40 = 0;
1367
1368         rs_set_expected_tpt_table(lq_sta, tbl);
1369
1370         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1371
1372         IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1373                 rate, rate_mask);
1374         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1375                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1376                                                 rate, rate_mask);
1377                 return -1;
1378         }
1379         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1380
1381         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1382                      tbl->current_rate, is_green);
1383         return 0;
1384 }
1385
1386 /*
1387  * Set up search table for SISO
1388  */
1389 static int rs_switch_to_siso(struct iwl_priv *priv,
1390                              struct iwl_lq_sta *lq_sta,
1391                              struct ieee80211_conf *conf,
1392                              struct ieee80211_sta *sta,
1393                              struct iwl_scale_tbl_info *tbl, int index)
1394 {
1395         u16 rate_mask;
1396         u8 is_green = lq_sta->is_green;
1397         s32 rate;
1398         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1399         struct iwl_rxon_context *ctx = sta_priv->ctx;
1400
1401         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1402                 return -1;
1403
1404         IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1405
1406         tbl->is_dup = lq_sta->is_dup;
1407         tbl->lq_type = LQ_SISO;
1408         tbl->action = 0;
1409         tbl->max_search = IWL_MAX_SEARCH;
1410         rate_mask = lq_sta->active_siso_rate;
1411
1412         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1413                 tbl->is_ht40 = 1;
1414         else
1415                 tbl->is_ht40 = 0;
1416
1417         if (is_green)
1418                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1419
1420         rs_set_expected_tpt_table(lq_sta, tbl);
1421         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1422
1423         IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1424         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1425                 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1426                              rate, rate_mask);
1427                 return -1;
1428         }
1429         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1430         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1431                      tbl->current_rate, is_green);
1432         return 0;
1433 }
1434
1435 /*
1436  * Try to switch to new modulation mode from legacy
1437  */
1438 static int rs_move_legacy_other(struct iwl_priv *priv,
1439                                 struct iwl_lq_sta *lq_sta,
1440                                 struct ieee80211_conf *conf,
1441                                 struct ieee80211_sta *sta,
1442                                 int index)
1443 {
1444         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1445         struct iwl_scale_tbl_info *search_tbl =
1446                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1447         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1448         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1449                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1450         u8 start_action;
1451         u8 valid_tx_ant = priv->eeprom_data->valid_tx_ant;
1452         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1453         int ret = 0;
1454         u8 update_search_tbl_counter = 0;
1455
1456         switch (priv->bt_traffic_load) {
1457         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1458                 /* nothing */
1459                 break;
1460         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1461                 /* avoid antenna B unless MIMO */
1462                 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1463                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1464                 break;
1465         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1466         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1467                 /* avoid antenna B and MIMO */
1468                 valid_tx_ant =
1469                         first_antenna(priv->eeprom_data->valid_tx_ant);
1470                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1471                     tbl->action != IWL_LEGACY_SWITCH_SISO)
1472                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1473                 break;
1474         default:
1475                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1476                 break;
1477         }
1478
1479         if (!iwl_ht_enabled(priv))
1480                 /* stay in Legacy */
1481                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1482         else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1483                    tbl->action > IWL_LEGACY_SWITCH_SISO)
1484                 tbl->action = IWL_LEGACY_SWITCH_SISO;
1485
1486         /* configure as 1x1 if bt full concurrency */
1487         if (priv->bt_full_concurrent) {
1488                 if (!iwl_ht_enabled(priv))
1489                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1490                 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1491                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1492                 valid_tx_ant =
1493                         first_antenna(priv->eeprom_data->valid_tx_ant);
1494         }
1495
1496         start_action = tbl->action;
1497         for (; ;) {
1498                 lq_sta->action_counter++;
1499                 switch (tbl->action) {
1500                 case IWL_LEGACY_SWITCH_ANTENNA1:
1501                 case IWL_LEGACY_SWITCH_ANTENNA2:
1502                         IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1503
1504                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1505                                                         tx_chains_num <= 1) ||
1506                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1507                                                         tx_chains_num <= 2))
1508                                 break;
1509
1510                         /* Don't change antenna if success has been great */
1511                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1512                             !priv->bt_full_concurrent &&
1513                             priv->bt_traffic_load ==
1514                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1515                                 break;
1516
1517                         /* Set up search table to try other antenna */
1518                         memcpy(search_tbl, tbl, sz);
1519
1520                         if (rs_toggle_antenna(valid_tx_ant,
1521                                 &search_tbl->current_rate, search_tbl)) {
1522                                 update_search_tbl_counter = 1;
1523                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1524                                 goto out;
1525                         }
1526                         break;
1527                 case IWL_LEGACY_SWITCH_SISO:
1528                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1529
1530                         /* Set up search table to try SISO */
1531                         memcpy(search_tbl, tbl, sz);
1532                         search_tbl->is_SGI = 0;
1533                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1534                                                  search_tbl, index);
1535                         if (!ret) {
1536                                 lq_sta->action_counter = 0;
1537                                 goto out;
1538                         }
1539
1540                         break;
1541                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1542                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1543                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1544                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1545
1546                         /* Set up search table to try MIMO */
1547                         memcpy(search_tbl, tbl, sz);
1548                         search_tbl->is_SGI = 0;
1549
1550                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1551                                 search_tbl->ant_type = ANT_AB;
1552                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1553                                 search_tbl->ant_type = ANT_AC;
1554                         else
1555                                 search_tbl->ant_type = ANT_BC;
1556
1557                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1558                                 break;
1559
1560                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1561                                                  search_tbl, index);
1562                         if (!ret) {
1563                                 lq_sta->action_counter = 0;
1564                                 goto out;
1565                         }
1566                         break;
1567
1568                 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1569                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1570
1571                         /* Set up search table to try MIMO3 */
1572                         memcpy(search_tbl, tbl, sz);
1573                         search_tbl->is_SGI = 0;
1574
1575                         search_tbl->ant_type = ANT_ABC;
1576
1577                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1578                                 break;
1579
1580                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1581                                                  search_tbl, index);
1582                         if (!ret) {
1583                                 lq_sta->action_counter = 0;
1584                                 goto out;
1585                         }
1586                         break;
1587                 }
1588                 tbl->action++;
1589                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1590                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1591
1592                 if (tbl->action == start_action)
1593                         break;
1594
1595         }
1596         search_tbl->lq_type = LQ_NONE;
1597         return 0;
1598
1599 out:
1600         lq_sta->search_better_tbl = 1;
1601         tbl->action++;
1602         if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1603                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1604         if (update_search_tbl_counter)
1605                 search_tbl->action = tbl->action;
1606         return 0;
1607
1608 }
1609
1610 /*
1611  * Try to switch to new modulation mode from SISO
1612  */
1613 static int rs_move_siso_to_other(struct iwl_priv *priv,
1614                                  struct iwl_lq_sta *lq_sta,
1615                                  struct ieee80211_conf *conf,
1616                                  struct ieee80211_sta *sta, int index)
1617 {
1618         u8 is_green = lq_sta->is_green;
1619         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1620         struct iwl_scale_tbl_info *search_tbl =
1621                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1622         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1623         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1624         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1625                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1626         u8 start_action;
1627         u8 valid_tx_ant = priv->eeprom_data->valid_tx_ant;
1628         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1629         u8 update_search_tbl_counter = 0;
1630         int ret;
1631
1632         switch (priv->bt_traffic_load) {
1633         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1634                 /* nothing */
1635                 break;
1636         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1637                 /* avoid antenna B unless MIMO */
1638                 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1639                         tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1640                 break;
1641         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1642         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1643                 /* avoid antenna B and MIMO */
1644                 valid_tx_ant =
1645                         first_antenna(priv->eeprom_data->valid_tx_ant);
1646                 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1647                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1648                 break;
1649         default:
1650                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1651                 break;
1652         }
1653
1654         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1655             tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1656                 /* stay in SISO */
1657                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1658         }
1659
1660         /* configure as 1x1 if bt full concurrency */
1661         if (priv->bt_full_concurrent) {
1662                 valid_tx_ant =
1663                         first_antenna(priv->eeprom_data->valid_tx_ant);
1664                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1665                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1666         }
1667
1668         start_action = tbl->action;
1669         for (;;) {
1670                 lq_sta->action_counter++;
1671                 switch (tbl->action) {
1672                 case IWL_SISO_SWITCH_ANTENNA1:
1673                 case IWL_SISO_SWITCH_ANTENNA2:
1674                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1675                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1676                                                 tx_chains_num <= 1) ||
1677                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1678                                                 tx_chains_num <= 2))
1679                                 break;
1680
1681                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1682                             !priv->bt_full_concurrent &&
1683                             priv->bt_traffic_load ==
1684                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1685                                 break;
1686
1687                         memcpy(search_tbl, tbl, sz);
1688                         if (rs_toggle_antenna(valid_tx_ant,
1689                                        &search_tbl->current_rate, search_tbl)) {
1690                                 update_search_tbl_counter = 1;
1691                                 goto out;
1692                         }
1693                         break;
1694                 case IWL_SISO_SWITCH_MIMO2_AB:
1695                 case IWL_SISO_SWITCH_MIMO2_AC:
1696                 case IWL_SISO_SWITCH_MIMO2_BC:
1697                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1698                         memcpy(search_tbl, tbl, sz);
1699                         search_tbl->is_SGI = 0;
1700
1701                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1702                                 search_tbl->ant_type = ANT_AB;
1703                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1704                                 search_tbl->ant_type = ANT_AC;
1705                         else
1706                                 search_tbl->ant_type = ANT_BC;
1707
1708                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1709                                 break;
1710
1711                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1712                                                  search_tbl, index);
1713                         if (!ret)
1714                                 goto out;
1715                         break;
1716                 case IWL_SISO_SWITCH_GI:
1717                         if (!tbl->is_ht40 && !(ht_cap->cap &
1718                                                 IEEE80211_HT_CAP_SGI_20))
1719                                 break;
1720                         if (tbl->is_ht40 && !(ht_cap->cap &
1721                                                 IEEE80211_HT_CAP_SGI_40))
1722                                 break;
1723
1724                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1725
1726                         memcpy(search_tbl, tbl, sz);
1727                         if (is_green) {
1728                                 if (!tbl->is_SGI)
1729                                         break;
1730                                 else
1731                                         IWL_ERR(priv,
1732                                                 "SGI was set in GF+SISO\n");
1733                         }
1734                         search_tbl->is_SGI = !tbl->is_SGI;
1735                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1736                         if (tbl->is_SGI) {
1737                                 s32 tpt = lq_sta->last_tpt / 100;
1738                                 if (tpt >= search_tbl->expected_tpt[index])
1739                                         break;
1740                         }
1741                         search_tbl->current_rate =
1742                                 rate_n_flags_from_tbl(priv, search_tbl,
1743                                                       index, is_green);
1744                         update_search_tbl_counter = 1;
1745                         goto out;
1746                 case IWL_SISO_SWITCH_MIMO3_ABC:
1747                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1748                         memcpy(search_tbl, tbl, sz);
1749                         search_tbl->is_SGI = 0;
1750                         search_tbl->ant_type = ANT_ABC;
1751
1752                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1753                                 break;
1754
1755                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1756                                                  search_tbl, index);
1757                         if (!ret)
1758                                 goto out;
1759                         break;
1760                 }
1761                 tbl->action++;
1762                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1763                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1764
1765                 if (tbl->action == start_action)
1766                         break;
1767         }
1768         search_tbl->lq_type = LQ_NONE;
1769         return 0;
1770
1771  out:
1772         lq_sta->search_better_tbl = 1;
1773         tbl->action++;
1774         if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1775                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1776         if (update_search_tbl_counter)
1777                 search_tbl->action = tbl->action;
1778
1779         return 0;
1780 }
1781
1782 /*
1783  * Try to switch to new modulation mode from MIMO2
1784  */
1785 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1786                                  struct iwl_lq_sta *lq_sta,
1787                                  struct ieee80211_conf *conf,
1788                                  struct ieee80211_sta *sta, int index)
1789 {
1790         s8 is_green = lq_sta->is_green;
1791         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1792         struct iwl_scale_tbl_info *search_tbl =
1793                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1794         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1795         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1796         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1797                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1798         u8 start_action;
1799         u8 valid_tx_ant = priv->eeprom_data->valid_tx_ant;
1800         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1801         u8 update_search_tbl_counter = 0;
1802         int ret;
1803
1804         switch (priv->bt_traffic_load) {
1805         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1806                 /* nothing */
1807                 break;
1808         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1809         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1810                 /* avoid antenna B and MIMO */
1811                 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1812                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1813                 break;
1814         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1815                 /* avoid antenna B unless MIMO */
1816                 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1817                     tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1818                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1819                 break;
1820         default:
1821                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1822                 break;
1823         }
1824
1825         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1826             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1827              tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1828                 /* switch in SISO */
1829                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1830         }
1831
1832         /* configure as 1x1 if bt full concurrency */
1833         if (priv->bt_full_concurrent &&
1834             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1835              tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1836                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1837
1838         start_action = tbl->action;
1839         for (;;) {
1840                 lq_sta->action_counter++;
1841                 switch (tbl->action) {
1842                 case IWL_MIMO2_SWITCH_ANTENNA1:
1843                 case IWL_MIMO2_SWITCH_ANTENNA2:
1844                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1845
1846                         if (tx_chains_num <= 2)
1847                                 break;
1848
1849                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1850                                 break;
1851
1852                         memcpy(search_tbl, tbl, sz);
1853                         if (rs_toggle_antenna(valid_tx_ant,
1854                                        &search_tbl->current_rate, search_tbl)) {
1855                                 update_search_tbl_counter = 1;
1856                                 goto out;
1857                         }
1858                         break;
1859                 case IWL_MIMO2_SWITCH_SISO_A:
1860                 case IWL_MIMO2_SWITCH_SISO_B:
1861                 case IWL_MIMO2_SWITCH_SISO_C:
1862                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1863
1864                         /* Set up new search table for SISO */
1865                         memcpy(search_tbl, tbl, sz);
1866
1867                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1868                                 search_tbl->ant_type = ANT_A;
1869                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1870                                 search_tbl->ant_type = ANT_B;
1871                         else
1872                                 search_tbl->ant_type = ANT_C;
1873
1874                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1875                                 break;
1876
1877                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1878                                                  search_tbl, index);
1879                         if (!ret)
1880                                 goto out;
1881
1882                         break;
1883
1884                 case IWL_MIMO2_SWITCH_GI:
1885                         if (!tbl->is_ht40 && !(ht_cap->cap &
1886                                                 IEEE80211_HT_CAP_SGI_20))
1887                                 break;
1888                         if (tbl->is_ht40 && !(ht_cap->cap &
1889                                                 IEEE80211_HT_CAP_SGI_40))
1890                                 break;
1891
1892                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1893
1894                         /* Set up new search table for MIMO2 */
1895                         memcpy(search_tbl, tbl, sz);
1896                         search_tbl->is_SGI = !tbl->is_SGI;
1897                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1898                         /*
1899                          * If active table already uses the fastest possible
1900                          * modulation (dual stream with short guard interval),
1901                          * and it's working well, there's no need to look
1902                          * for a better type of modulation!
1903                          */
1904                         if (tbl->is_SGI) {
1905                                 s32 tpt = lq_sta->last_tpt / 100;
1906                                 if (tpt >= search_tbl->expected_tpt[index])
1907                                         break;
1908                         }
1909                         search_tbl->current_rate =
1910                                 rate_n_flags_from_tbl(priv, search_tbl,
1911                                                       index, is_green);
1912                         update_search_tbl_counter = 1;
1913                         goto out;
1914
1915                 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1916                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1917                         memcpy(search_tbl, tbl, sz);
1918                         search_tbl->is_SGI = 0;
1919                         search_tbl->ant_type = ANT_ABC;
1920
1921                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1922                                 break;
1923
1924                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1925                                                  search_tbl, index);
1926                         if (!ret)
1927                                 goto out;
1928
1929                         break;
1930                 }
1931                 tbl->action++;
1932                 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1933                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1934
1935                 if (tbl->action == start_action)
1936                         break;
1937         }
1938         search_tbl->lq_type = LQ_NONE;
1939         return 0;
1940  out:
1941         lq_sta->search_better_tbl = 1;
1942         tbl->action++;
1943         if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1944                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1945         if (update_search_tbl_counter)
1946                 search_tbl->action = tbl->action;
1947
1948         return 0;
1949
1950 }
1951
1952 /*
1953  * Try to switch to new modulation mode from MIMO3
1954  */
1955 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1956                                  struct iwl_lq_sta *lq_sta,
1957                                  struct ieee80211_conf *conf,
1958                                  struct ieee80211_sta *sta, int index)
1959 {
1960         s8 is_green = lq_sta->is_green;
1961         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1962         struct iwl_scale_tbl_info *search_tbl =
1963                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1964         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1965         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1966         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1967                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1968         u8 start_action;
1969         u8 valid_tx_ant = priv->eeprom_data->valid_tx_ant;
1970         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1971         int ret;
1972         u8 update_search_tbl_counter = 0;
1973
1974         switch (priv->bt_traffic_load) {
1975         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1976                 /* nothing */
1977                 break;
1978         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1979         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1980                 /* avoid antenna B and MIMO */
1981                 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1982                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1983                 break;
1984         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1985                 /* avoid antenna B unless MIMO */
1986                 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1987                     tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1988                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1989                 break;
1990         default:
1991                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1992                 break;
1993         }
1994
1995         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1996             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1997              tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1998                 /* switch in SISO */
1999                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
2000         }
2001
2002         /* configure as 1x1 if bt full concurrency */
2003         if (priv->bt_full_concurrent &&
2004             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
2005              tbl->action > IWL_MIMO3_SWITCH_SISO_C))
2006                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
2007
2008         start_action = tbl->action;
2009         for (;;) {
2010                 lq_sta->action_counter++;
2011                 switch (tbl->action) {
2012                 case IWL_MIMO3_SWITCH_ANTENNA1:
2013                 case IWL_MIMO3_SWITCH_ANTENNA2:
2014                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
2015
2016                         if (tx_chains_num <= 3)
2017                                 break;
2018
2019                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2020                                 break;
2021
2022                         memcpy(search_tbl, tbl, sz);
2023                         if (rs_toggle_antenna(valid_tx_ant,
2024                                        &search_tbl->current_rate, search_tbl))
2025                                 goto out;
2026                         break;
2027                 case IWL_MIMO3_SWITCH_SISO_A:
2028                 case IWL_MIMO3_SWITCH_SISO_B:
2029                 case IWL_MIMO3_SWITCH_SISO_C:
2030                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2031
2032                         /* Set up new search table for SISO */
2033                         memcpy(search_tbl, tbl, sz);
2034
2035                         if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2036                                 search_tbl->ant_type = ANT_A;
2037                         else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2038                                 search_tbl->ant_type = ANT_B;
2039                         else
2040                                 search_tbl->ant_type = ANT_C;
2041
2042                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2043                                 break;
2044
2045                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2046                                                  search_tbl, index);
2047                         if (!ret)
2048                                 goto out;
2049
2050                         break;
2051
2052                 case IWL_MIMO3_SWITCH_MIMO2_AB:
2053                 case IWL_MIMO3_SWITCH_MIMO2_AC:
2054                 case IWL_MIMO3_SWITCH_MIMO2_BC:
2055                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2056
2057                         memcpy(search_tbl, tbl, sz);
2058                         search_tbl->is_SGI = 0;
2059                         if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2060                                 search_tbl->ant_type = ANT_AB;
2061                         else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2062                                 search_tbl->ant_type = ANT_AC;
2063                         else
2064                                 search_tbl->ant_type = ANT_BC;
2065
2066                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2067                                 break;
2068
2069                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2070                                                  search_tbl, index);
2071                         if (!ret)
2072                                 goto out;
2073
2074                         break;
2075
2076                 case IWL_MIMO3_SWITCH_GI:
2077                         if (!tbl->is_ht40 && !(ht_cap->cap &
2078                                                 IEEE80211_HT_CAP_SGI_20))
2079                                 break;
2080                         if (tbl->is_ht40 && !(ht_cap->cap &
2081                                                 IEEE80211_HT_CAP_SGI_40))
2082                                 break;
2083
2084                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2085
2086                         /* Set up new search table for MIMO */
2087                         memcpy(search_tbl, tbl, sz);
2088                         search_tbl->is_SGI = !tbl->is_SGI;
2089                         rs_set_expected_tpt_table(lq_sta, search_tbl);
2090                         /*
2091                          * If active table already uses the fastest possible
2092                          * modulation (dual stream with short guard interval),
2093                          * and it's working well, there's no need to look
2094                          * for a better type of modulation!
2095                          */
2096                         if (tbl->is_SGI) {
2097                                 s32 tpt = lq_sta->last_tpt / 100;
2098                                 if (tpt >= search_tbl->expected_tpt[index])
2099                                         break;
2100                         }
2101                         search_tbl->current_rate =
2102                                 rate_n_flags_from_tbl(priv, search_tbl,
2103                                                       index, is_green);
2104                         update_search_tbl_counter = 1;
2105                         goto out;
2106                 }
2107                 tbl->action++;
2108                 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2109                         tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2110
2111                 if (tbl->action == start_action)
2112                         break;
2113         }
2114         search_tbl->lq_type = LQ_NONE;
2115         return 0;
2116  out:
2117         lq_sta->search_better_tbl = 1;
2118         tbl->action++;
2119         if (tbl->action > IWL_MIMO3_SWITCH_GI)
2120                 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2121         if (update_search_tbl_counter)
2122                 search_tbl->action = tbl->action;
2123
2124         return 0;
2125
2126 }
2127
2128 /*
2129  * Check whether we should continue using same modulation mode, or
2130  * begin search for a new mode, based on:
2131  * 1) # tx successes or failures while using this mode
2132  * 2) # times calling this function
2133  * 3) elapsed time in this mode (not used, for now)
2134  */
2135 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2136 {
2137         struct iwl_scale_tbl_info *tbl;
2138         int i;
2139         int active_tbl;
2140         int flush_interval_passed = 0;
2141         struct iwl_priv *priv;
2142
2143         priv = lq_sta->drv;
2144         active_tbl = lq_sta->active_tbl;
2145
2146         tbl = &(lq_sta->lq_info[active_tbl]);
2147
2148         /* If we've been disallowing search, see if we should now allow it */
2149         if (lq_sta->stay_in_tbl) {
2150
2151                 /* Elapsed time using current modulation mode */
2152                 if (lq_sta->flush_timer)
2153                         flush_interval_passed =
2154                         time_after(jiffies,
2155                                         (unsigned long)(lq_sta->flush_timer +
2156                                         IWL_RATE_SCALE_FLUSH_INTVL));
2157
2158                 /*
2159                  * Check if we should allow search for new modulation mode.
2160                  * If many frames have failed or succeeded, or we've used
2161                  * this same modulation for a long time, allow search, and
2162                  * reset history stats that keep track of whether we should
2163                  * allow a new search.  Also (below) reset all bitmaps and
2164                  * stats in active history.
2165                  */
2166                 if (force_search ||
2167                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2168                     (lq_sta->total_success > lq_sta->max_success_limit) ||
2169                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2170                      && (flush_interval_passed))) {
2171                         IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n",
2172                                      lq_sta->total_failed,
2173                                      lq_sta->total_success,
2174                                      flush_interval_passed);
2175
2176                         /* Allow search for new mode */
2177                         lq_sta->stay_in_tbl = 0;        /* only place reset */
2178                         lq_sta->total_failed = 0;
2179                         lq_sta->total_success = 0;
2180                         lq_sta->flush_timer = 0;
2181
2182                 /*
2183                  * Else if we've used this modulation mode enough repetitions
2184                  * (regardless of elapsed time or success/failure), reset
2185                  * history bitmaps and rate-specific stats for all rates in
2186                  * active table.
2187                  */
2188                 } else {
2189                         lq_sta->table_count++;
2190                         if (lq_sta->table_count >=
2191                             lq_sta->table_count_limit) {
2192                                 lq_sta->table_count = 0;
2193
2194                                 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2195                                 for (i = 0; i < IWL_RATE_COUNT; i++)
2196                                         rs_rate_scale_clear_window(
2197                                                 &(tbl->win[i]));
2198                         }
2199                 }
2200
2201                 /* If transitioning to allow "search", reset all history
2202                  * bitmaps and stats in active table (this will become the new
2203                  * "search" table). */
2204                 if (!lq_sta->stay_in_tbl) {
2205                         for (i = 0; i < IWL_RATE_COUNT; i++)
2206                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2207                 }
2208         }
2209 }
2210
2211 /*
2212  * setup rate table in uCode
2213  */
2214 static void rs_update_rate_tbl(struct iwl_priv *priv,
2215                                struct iwl_rxon_context *ctx,
2216                                struct iwl_lq_sta *lq_sta,
2217                                struct iwl_scale_tbl_info *tbl,
2218                                int index, u8 is_green)
2219 {
2220         u32 rate;
2221
2222         /* Update uCode's rate table. */
2223         rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2224         rs_fill_link_cmd(priv, lq_sta, rate);
2225         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2226 }
2227
2228 /*
2229  * Do rate scaling and search for new modulation mode.
2230  */
2231 static void rs_rate_scale_perform(struct iwl_priv *priv,
2232                                   struct sk_buff *skb,
2233                                   struct ieee80211_sta *sta,
2234                                   struct iwl_lq_sta *lq_sta)
2235 {
2236         struct ieee80211_hw *hw = priv->hw;
2237         struct ieee80211_conf *conf = &hw->conf;
2238         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2239         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2240         int low = IWL_RATE_INVALID;
2241         int high = IWL_RATE_INVALID;
2242         int index;
2243         int i;
2244         struct iwl_rate_scale_data *window = NULL;
2245         int current_tpt = IWL_INVALID_VALUE;
2246         int low_tpt = IWL_INVALID_VALUE;
2247         int high_tpt = IWL_INVALID_VALUE;
2248         u32 fail_count;
2249         s8 scale_action = 0;
2250         u16 rate_mask;
2251         u8 update_lq = 0;
2252         struct iwl_scale_tbl_info *tbl, *tbl1;
2253         u16 rate_scale_index_msk = 0;
2254         u8 is_green = 0;
2255         u8 active_tbl = 0;
2256         u8 done_search = 0;
2257         u16 high_low;
2258         s32 sr;
2259         u8 tid = IWL_MAX_TID_COUNT;
2260         struct iwl_tid_data *tid_data;
2261         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2262         struct iwl_rxon_context *ctx = sta_priv->ctx;
2263
2264         IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2265
2266         /* Send management frames and NO_ACK data using lowest rate. */
2267         /* TODO: this could probably be improved.. */
2268         if (!ieee80211_is_data(hdr->frame_control) ||
2269             info->flags & IEEE80211_TX_CTL_NO_ACK)
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 != IWL_MAX_TID_COUNT) &&
2276             (lq_sta->tx_agg_tid_en & (1 << tid))) {
2277                 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid];
2278                 if (tid_data->agg.state == IWL_AGG_OFF)
2279                         lq_sta->is_agg = 0;
2280                 else
2281                         lq_sta->is_agg = 1;
2282         } else
2283                 lq_sta->is_agg = 0;
2284
2285         /*
2286          * Select rate-scale / modulation-mode table to work with in
2287          * the rest of this function:  "search" if searching for better
2288          * modulation mode, or "active" if doing rate scaling within a mode.
2289          */
2290         if (!lq_sta->search_better_tbl)
2291                 active_tbl = lq_sta->active_tbl;
2292         else
2293                 active_tbl = 1 - lq_sta->active_tbl;
2294
2295         tbl = &(lq_sta->lq_info[active_tbl]);
2296         if (is_legacy(tbl->lq_type))
2297                 lq_sta->is_green = 0;
2298         else
2299                 lq_sta->is_green = rs_use_green(sta);
2300         is_green = lq_sta->is_green;
2301
2302         /* current tx rate */
2303         index = lq_sta->last_txrate_idx;
2304
2305         IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2306                        tbl->lq_type);
2307
2308         /* rates available for this association, and for modulation mode */
2309         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2310
2311         IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2312
2313         /* mask with station rate restriction */
2314         if (is_legacy(tbl->lq_type)) {
2315                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2316                         /* supp_rates has no CCK bits in A mode */
2317                         rate_scale_index_msk = (u16) (rate_mask &
2318                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2319                 else
2320                         rate_scale_index_msk = (u16) (rate_mask &
2321                                                       lq_sta->supp_rates);
2322
2323         } else
2324                 rate_scale_index_msk = rate_mask;
2325
2326         if (!rate_scale_index_msk)
2327                 rate_scale_index_msk = rate_mask;
2328
2329         if (!((1 << index) & rate_scale_index_msk)) {
2330                 IWL_ERR(priv, "Current Rate is not valid\n");
2331                 if (lq_sta->search_better_tbl) {
2332                         /* revert to active table if search table is not valid*/
2333                         tbl->lq_type = LQ_NONE;
2334                         lq_sta->search_better_tbl = 0;
2335                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2336                         /* get "active" rate info */
2337                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2338                         rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2339                                            index, is_green);
2340                 }
2341                 return;
2342         }
2343
2344         /* Get expected throughput table and history window for current rate */
2345         if (!tbl->expected_tpt) {
2346                 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2347                 return;
2348         }
2349
2350         /* force user max rate if set by user */
2351         if ((lq_sta->max_rate_idx != -1) &&
2352             (lq_sta->max_rate_idx < index)) {
2353                 index = lq_sta->max_rate_idx;
2354                 update_lq = 1;
2355                 window = &(tbl->win[index]);
2356                 goto lq_update;
2357         }
2358
2359         window = &(tbl->win[index]);
2360
2361         /*
2362          * If there is not enough history to calculate actual average
2363          * throughput, keep analyzing results of more tx frames, without
2364          * changing rate or mode (bypass most of the rest of this function).
2365          * Set up new rate table in uCode only if old rate is not supported
2366          * in current association (use new rate found above).
2367          */
2368         fail_count = window->counter - window->success_counter;
2369         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2370                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2371                 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2372                                "for index %d\n",
2373                                window->success_counter, window->counter, index);
2374
2375                 /* Can't calculate this yet; not enough history */
2376                 window->average_tpt = IWL_INVALID_VALUE;
2377
2378                 /* Should we stay with this modulation mode,
2379                  * or search for a new one? */
2380                 rs_stay_in_table(lq_sta, false);
2381
2382                 goto out;
2383         }
2384         /* Else we have enough samples; calculate estimate of
2385          * actual average throughput */
2386         if (window->average_tpt != ((window->success_ratio *
2387                         tbl->expected_tpt[index] + 64) / 128)) {
2388                 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2389                 window->average_tpt = ((window->success_ratio *
2390                                         tbl->expected_tpt[index] + 64) / 128);
2391         }
2392
2393         /* If we are searching for better modulation mode, check success. */
2394         if (lq_sta->search_better_tbl &&
2395             (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2396                 /* If good success, continue using the "search" mode;
2397                  * no need to send new link quality command, since we're
2398                  * continuing to use the setup that we've been trying. */
2399                 if (window->average_tpt > lq_sta->last_tpt) {
2400
2401                         IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2402                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2403                                         window->success_ratio,
2404                                         window->average_tpt,
2405                                         lq_sta->last_tpt);
2406
2407                         if (!is_legacy(tbl->lq_type))
2408                                 lq_sta->enable_counter = 1;
2409
2410                         /* Swap tables; "search" becomes "active" */
2411                         lq_sta->active_tbl = active_tbl;
2412                         current_tpt = window->average_tpt;
2413
2414                 /* Else poor success; go back to mode in "active" table */
2415                 } else {
2416
2417                         IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2418                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2419                                         window->success_ratio,
2420                                         window->average_tpt,
2421                                         lq_sta->last_tpt);
2422
2423                         /* Nullify "search" table */
2424                         tbl->lq_type = LQ_NONE;
2425
2426                         /* Revert to "active" table */
2427                         active_tbl = lq_sta->active_tbl;
2428                         tbl = &(lq_sta->lq_info[active_tbl]);
2429
2430                         /* Revert to "active" rate and throughput info */
2431                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2432                         current_tpt = lq_sta->last_tpt;
2433
2434                         /* Need to set up a new rate table in uCode */
2435                         update_lq = 1;
2436                 }
2437
2438                 /* Either way, we've made a decision; modulation mode
2439                  * search is done, allow rate adjustment next time. */
2440                 lq_sta->search_better_tbl = 0;
2441                 done_search = 1;        /* Don't switch modes below! */
2442                 goto lq_update;
2443         }
2444
2445         /* (Else) not in search of better modulation mode, try for better
2446          * starting rate, while staying in this mode. */
2447         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2448                                         tbl->lq_type);
2449         low = high_low & 0xff;
2450         high = (high_low >> 8) & 0xff;
2451
2452         /* If user set max rate, dont allow higher than user constrain */
2453         if ((lq_sta->max_rate_idx != -1) &&
2454             (lq_sta->max_rate_idx < high))
2455                 high = IWL_RATE_INVALID;
2456
2457         sr = window->success_ratio;
2458
2459         /* Collect measured throughputs for current and adjacent rates */
2460         current_tpt = window->average_tpt;
2461         if (low != IWL_RATE_INVALID)
2462                 low_tpt = tbl->win[low].average_tpt;
2463         if (high != IWL_RATE_INVALID)
2464                 high_tpt = tbl->win[high].average_tpt;
2465
2466         scale_action = 0;
2467
2468         /* Too many failures, decrease rate */
2469         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2470                 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2471                 scale_action = -1;
2472
2473         /* No throughput measured yet for adjacent rates; try increase. */
2474         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2475                    (high_tpt == IWL_INVALID_VALUE)) {
2476
2477                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2478                         scale_action = 1;
2479                 else if (low != IWL_RATE_INVALID)
2480                         scale_action = 0;
2481         }
2482
2483         /* Both adjacent throughputs are measured, but neither one has better
2484          * throughput; we're using the best rate, don't change it! */
2485         else if ((low_tpt != IWL_INVALID_VALUE) &&
2486                  (high_tpt != IWL_INVALID_VALUE) &&
2487                  (low_tpt < current_tpt) &&
2488                  (high_tpt < current_tpt))
2489                 scale_action = 0;
2490
2491         /* At least one adjacent rate's throughput is measured,
2492          * and may have better performance. */
2493         else {
2494                 /* Higher adjacent rate's throughput is measured */
2495                 if (high_tpt != IWL_INVALID_VALUE) {
2496                         /* Higher rate has better throughput */
2497                         if (high_tpt > current_tpt &&
2498                                         sr >= IWL_RATE_INCREASE_TH) {
2499                                 scale_action = 1;
2500                         } else {
2501                                 scale_action = 0;
2502                         }
2503
2504                 /* Lower adjacent rate's throughput is measured */
2505                 } else if (low_tpt != IWL_INVALID_VALUE) {
2506                         /* Lower rate has better throughput */
2507                         if (low_tpt > current_tpt) {
2508                                 IWL_DEBUG_RATE(priv,
2509                                     "decrease rate because of low tpt\n");
2510                                 scale_action = -1;
2511                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2512                                 scale_action = 1;
2513                         }
2514                 }
2515         }
2516
2517         /* Sanity check; asked for decrease, but success rate or throughput
2518          * has been good at old rate.  Don't change it. */
2519         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2520                     ((sr > IWL_RATE_HIGH_TH) ||
2521                      (current_tpt > (100 * tbl->expected_tpt[low]))))
2522                 scale_action = 0;
2523         if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2524                 scale_action = -1;
2525         if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2526                 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2527                 scale_action = -1;
2528
2529         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2530              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2531                 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2532                         /*
2533                          * don't set scale_action, don't want to scale up if
2534                          * the rate scale doesn't otherwise think that is a
2535                          * good idea.
2536                          */
2537                 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2538                         scale_action = -1;
2539                 }
2540         }
2541         lq_sta->last_bt_traffic = priv->bt_traffic_load;
2542
2543         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2544              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2545                 /* search for a new modulation */
2546                 rs_stay_in_table(lq_sta, true);
2547                 goto lq_update;
2548         }
2549
2550         switch (scale_action) {
2551         case -1:
2552                 /* Decrease starting rate, update uCode's rate table */
2553                 if (low != IWL_RATE_INVALID) {
2554                         update_lq = 1;
2555                         index = low;
2556                 }
2557
2558                 break;
2559         case 1:
2560                 /* Increase starting rate, update uCode's rate table */
2561                 if (high != IWL_RATE_INVALID) {
2562                         update_lq = 1;
2563                         index = high;
2564                 }
2565
2566                 break;
2567         case 0:
2568                 /* No change */
2569         default:
2570                 break;
2571         }
2572
2573         IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2574                     "high %d type %d\n",
2575                      index, scale_action, low, high, tbl->lq_type);
2576
2577 lq_update:
2578         /* Replace uCode's rate table for the destination station. */
2579         if (update_lq)
2580                 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2581
2582         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2583                 /* Should we stay with this modulation mode,
2584                  * or search for a new one? */
2585           rs_stay_in_table(lq_sta, false);
2586         }
2587         /*
2588          * Search for new modulation mode if we're:
2589          * 1)  Not changing rates right now
2590          * 2)  Not just finishing up a search
2591          * 3)  Allowing a new search
2592          */
2593         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2594                 /* Save current throughput to compare with "search" throughput*/
2595                 lq_sta->last_tpt = current_tpt;
2596
2597                 /* Select a new "search" modulation mode to try.
2598                  * If one is found, set up the new "search" table. */
2599                 if (is_legacy(tbl->lq_type))
2600                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2601                 else if (is_siso(tbl->lq_type))
2602                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2603                 else if (is_mimo2(tbl->lq_type))
2604                         rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2605                 else
2606                         rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2607
2608                 /* If new "search" mode was selected, set up in uCode table */
2609                 if (lq_sta->search_better_tbl) {
2610                         /* Access the "search" table, clear its history. */
2611                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2612                         for (i = 0; i < IWL_RATE_COUNT; i++)
2613                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2614
2615                         /* Use new "search" start rate */
2616                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2617
2618                         IWL_DEBUG_RATE(priv, "Switch current  mcs: %X index: %d\n",
2619                                      tbl->current_rate, index);
2620                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2621                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2622                 } else
2623                         done_search = 1;
2624         }
2625
2626         if (done_search && !lq_sta->stay_in_tbl) {
2627                 /* If the "active" (non-search) mode was legacy,
2628                  * and we've tried switching antennas,
2629                  * but we haven't been able to try HT modes (not available),
2630                  * stay with best antenna legacy modulation for a while
2631                  * before next round of mode comparisons. */
2632                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2633                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2634                     lq_sta->action_counter > tbl1->max_search) {
2635                         IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2636                         rs_set_stay_in_table(priv, 1, lq_sta);
2637                 }
2638
2639                 /* If we're in an HT mode, and all 3 mode switch actions
2640                  * have been tried and compared, stay in this best modulation
2641                  * mode for a while before next round of mode comparisons. */
2642                 if (lq_sta->enable_counter &&
2643                     (lq_sta->action_counter >= tbl1->max_search) &&
2644                     iwl_ht_enabled(priv)) {
2645                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2646                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2647                             (tid != IWL_MAX_TID_COUNT)) {
2648                                 u8 sta_id = lq_sta->lq.sta_id;
2649                                 tid_data = &priv->tid_data[sta_id][tid];
2650                                 if (tid_data->agg.state == IWL_AGG_OFF) {
2651                                         IWL_DEBUG_RATE(priv,
2652                                                        "try to aggregate tid %d\n",
2653                                                        tid);
2654                                         rs_tl_turn_on_agg(priv, tid,
2655                                                           lq_sta, sta);
2656                                 }
2657                         }
2658                         rs_set_stay_in_table(priv, 0, lq_sta);
2659                 }
2660         }
2661
2662 out:
2663         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2664         lq_sta->last_txrate_idx = index;
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_sta *sta,
2683                              struct iwl_lq_sta *lq_sta)
2684 {
2685         struct iwl_scale_tbl_info *tbl;
2686         int rate_idx;
2687         int i;
2688         u32 rate;
2689         u8 use_green = rs_use_green(sta);
2690         u8 active_tbl = 0;
2691         u8 valid_tx_ant;
2692         struct iwl_station_priv *sta_priv;
2693         struct iwl_rxon_context *ctx;
2694
2695         if (!sta || !lq_sta)
2696                 return;
2697
2698         sta_priv = (void *)sta->drv_priv;
2699         ctx = sta_priv->ctx;
2700
2701         i = lq_sta->last_txrate_idx;
2702
2703         valid_tx_ant = priv->eeprom_data->valid_tx_ant;
2704
2705         if (!lq_sta->search_better_tbl)
2706                 active_tbl = lq_sta->active_tbl;
2707         else
2708                 active_tbl = 1 - lq_sta->active_tbl;
2709
2710         tbl = &(lq_sta->lq_info[active_tbl]);
2711
2712         if ((i < 0) || (i >= IWL_RATE_COUNT))
2713                 i = 0;
2714
2715         rate = iwl_rates[i].plcp;
2716         tbl->ant_type = first_antenna(valid_tx_ant);
2717         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2718
2719         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2720                 rate |= RATE_MCS_CCK_MSK;
2721
2722         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2723         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2724             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2725
2726         rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2727         tbl->current_rate = rate;
2728         rs_set_expected_tpt_table(lq_sta, tbl);
2729         rs_fill_link_cmd(NULL, lq_sta, rate);
2730         priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2731         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2732 }
2733
2734 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2735                         struct ieee80211_tx_rate_control *txrc)
2736 {
2737
2738         struct sk_buff *skb = txrc->skb;
2739         struct ieee80211_supported_band *sband = txrc->sband;
2740         struct iwl_op_mode *op_mode __maybe_unused =
2741                         (struct iwl_op_mode *)priv_r;
2742         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2743         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2744         struct iwl_lq_sta *lq_sta = priv_sta;
2745         int rate_idx;
2746
2747         IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2748
2749         /* Get max rate if user set max rate */
2750         if (lq_sta) {
2751                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2752                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2753                     (lq_sta->max_rate_idx != -1))
2754                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2755                 if ((lq_sta->max_rate_idx < 0) ||
2756                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2757                         lq_sta->max_rate_idx = -1;
2758         }
2759
2760         /* Treat uninitialized rate scaling data same as non-existing. */
2761         if (lq_sta && !lq_sta->drv) {
2762                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2763                 priv_sta = NULL;
2764         }
2765
2766         /* Send management frames and NO_ACK data using lowest rate. */
2767         if (rate_control_send_low(sta, priv_sta, txrc))
2768                 return;
2769
2770         rate_idx  = lq_sta->last_txrate_idx;
2771
2772         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2773                 rate_idx -= IWL_FIRST_OFDM_RATE;
2774                 /* 6M and 9M shared same MCS index */
2775                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2776                 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2777                     IWL_RATE_MIMO3_6M_PLCP)
2778                         rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2779                 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2780                          IWL_RATE_MIMO2_6M_PLCP)
2781                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2782                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2783                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2784                         info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2785                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2786                         info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2787                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2788                         info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2789                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2790                         info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2791         } else {
2792                 /* Check for invalid rates */
2793                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2794                                 ((sband->band == IEEE80211_BAND_5GHZ) &&
2795                                  (rate_idx < IWL_FIRST_OFDM_RATE)))
2796                         rate_idx = rate_lowest_index(sband, sta);
2797                 /* On valid 5 GHz rate, adjust index */
2798                 else if (sband->band == IEEE80211_BAND_5GHZ)
2799                         rate_idx -= IWL_FIRST_OFDM_RATE;
2800                 info->control.rates[0].flags = 0;
2801         }
2802         info->control.rates[0].idx = rate_idx;
2803
2804 }
2805
2806 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2807                           gfp_t gfp)
2808 {
2809         struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2810         struct iwl_op_mode *op_mode __maybe_unused =
2811                         (struct iwl_op_mode *)priv_rate;
2812         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2813
2814         IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2815
2816         return &sta_priv->lq_sta;
2817 }
2818
2819 /*
2820  * Called after adding a new station to initialize rate scaling
2821  */
2822 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2823 {
2824         int i, j;
2825         struct ieee80211_hw *hw = priv->hw;
2826         struct ieee80211_conf *conf = &priv->hw->conf;
2827         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2828         struct iwl_station_priv *sta_priv;
2829         struct iwl_lq_sta *lq_sta;
2830         struct ieee80211_supported_band *sband;
2831         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2832
2833         sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2834         lq_sta = &sta_priv->lq_sta;
2835         sband = hw->wiphy->bands[conf->channel->band];
2836
2837
2838         lq_sta->lq.sta_id = sta_id;
2839
2840         for (j = 0; j < LQ_SIZE; j++)
2841                 for (i = 0; i < IWL_RATE_COUNT; i++)
2842                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2843
2844         lq_sta->flush_timer = 0;
2845         lq_sta->supp_rates = sta->supp_rates[sband->band];
2846         for (j = 0; j < LQ_SIZE; j++)
2847                 for (i = 0; i < IWL_RATE_COUNT; i++)
2848                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2849
2850         IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2851                        sta_id);
2852         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2853          * the lowest or the highest rate.. Could consider using RSSI from
2854          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2855          * after assoc.. */
2856
2857         lq_sta->is_dup = 0;
2858         lq_sta->max_rate_idx = -1;
2859         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2860         lq_sta->is_green = rs_use_green(sta);
2861         lq_sta->band = sband->band;
2862         /*
2863          * active legacy rates as per supported rates bitmap
2864          */
2865         supp = sta->supp_rates[sband->band];
2866         lq_sta->active_legacy_rate = 0;
2867         for_each_set_bit(i, &supp, BITS_PER_LONG)
2868                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2869
2870         /*
2871          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2872          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2873          */
2874         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2875         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2876         lq_sta->active_siso_rate &= ~((u16)0x2);
2877         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2878
2879         /* Same here */
2880         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2881         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2882         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2883         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2884
2885         lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2886         lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2887         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2888         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2889
2890         IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2891                      lq_sta->active_siso_rate,
2892                      lq_sta->active_mimo2_rate,
2893                      lq_sta->active_mimo3_rate);
2894
2895         /* These values will be overridden later */
2896         lq_sta->lq.general_params.single_stream_ant_msk =
2897                 first_antenna(priv->eeprom_data->valid_tx_ant);
2898         lq_sta->lq.general_params.dual_stream_ant_msk =
2899                 priv->eeprom_data->valid_tx_ant &
2900                 ~first_antenna(priv->eeprom_data->valid_tx_ant);
2901         if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2902                 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2903         } else if (num_of_ant(priv->eeprom_data->valid_tx_ant) == 2) {
2904                 lq_sta->lq.general_params.dual_stream_ant_msk =
2905                         priv->eeprom_data->valid_tx_ant;
2906         }
2907
2908         /* as default allow aggregation for all tids */
2909         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2910         lq_sta->drv = priv;
2911
2912         /* Set last_txrate_idx to lowest rate */
2913         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2914         if (sband->band == IEEE80211_BAND_5GHZ)
2915                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2916         lq_sta->is_agg = 0;
2917 #ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE
2918         priv->tm_fixed_rate = 0;
2919 #endif
2920 #ifdef CONFIG_MAC80211_DEBUGFS
2921         lq_sta->dbg_fixed_rate = 0;
2922 #endif
2923
2924         rs_initialize_lq(priv, sta, lq_sta);
2925 }
2926
2927 static void rs_fill_link_cmd(struct iwl_priv *priv,
2928                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2929 {
2930         struct iwl_scale_tbl_info tbl_type;
2931         int index = 0;
2932         int rate_idx;
2933         int repeat_rate = 0;
2934         u8 ant_toggle_cnt = 0;
2935         u8 use_ht_possible = 1;
2936         u8 valid_tx_ant = 0;
2937         struct iwl_station_priv *sta_priv =
2938                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2939         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2940
2941         /* Override starting rate (index 0) if needed for debug purposes */
2942         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2943
2944         /* Interpret new_rate (rate_n_flags) */
2945         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2946                                   &tbl_type, &rate_idx);
2947
2948         if (priv && priv->bt_full_concurrent) {
2949                 /* 1x1 only */
2950                 tbl_type.ant_type =
2951                         first_antenna(priv->eeprom_data->valid_tx_ant);
2952         }
2953
2954         /* How many times should we repeat the initial rate? */
2955         if (is_legacy(tbl_type.lq_type)) {
2956                 ant_toggle_cnt = 1;
2957                 repeat_rate = IWL_NUMBER_TRY;
2958         } else {
2959                 repeat_rate = min(IWL_HT_NUMBER_TRY,
2960                                   LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2961         }
2962
2963         lq_cmd->general_params.mimo_delimiter =
2964                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2965
2966         /* Fill 1st table entry (index 0) */
2967         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2968
2969         if (num_of_ant(tbl_type.ant_type) == 1) {
2970                 lq_cmd->general_params.single_stream_ant_msk =
2971                                                 tbl_type.ant_type;
2972         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2973                 lq_cmd->general_params.dual_stream_ant_msk =
2974                                                 tbl_type.ant_type;
2975         } /* otherwise we don't modify the existing value */
2976
2977         index++;
2978         repeat_rate--;
2979         if (priv) {
2980                 if (priv->bt_full_concurrent)
2981                         valid_tx_ant = ANT_A;
2982                 else
2983                         valid_tx_ant = priv->eeprom_data->valid_tx_ant;
2984         }
2985
2986         /* Fill rest of rate table */
2987         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2988                 /* Repeat initial/next rate.
2989                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2990                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2991                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2992                         if (is_legacy(tbl_type.lq_type)) {
2993                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2994                                         ant_toggle_cnt++;
2995                                 else if (priv &&
2996                                          rs_toggle_antenna(valid_tx_ant,
2997                                                         &new_rate, &tbl_type))
2998                                         ant_toggle_cnt = 1;
2999                         }
3000
3001                         /* Override next rate if needed for debug purposes */
3002                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3003
3004                         /* Fill next table entry */
3005                         lq_cmd->rs_table[index].rate_n_flags =
3006                                         cpu_to_le32(new_rate);
3007                         repeat_rate--;
3008                         index++;
3009                 }
3010
3011                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
3012                                                 &rate_idx);
3013
3014                 if (priv && priv->bt_full_concurrent) {
3015                         /* 1x1 only */
3016                         tbl_type.ant_type =
3017                             first_antenna(priv->eeprom_data->valid_tx_ant);
3018                 }
3019
3020                 /* Indicate to uCode which entries might be MIMO.
3021                  * If initial rate was MIMO, this will finally end up
3022                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
3023                 if (is_mimo(tbl_type.lq_type))
3024                         lq_cmd->general_params.mimo_delimiter = index;
3025
3026                 /* Get next rate */
3027                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3028                                              use_ht_possible);
3029
3030                 /* How many times should we repeat the next rate? */
3031                 if (is_legacy(tbl_type.lq_type)) {
3032                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3033                                 ant_toggle_cnt++;
3034                         else if (priv &&
3035                                  rs_toggle_antenna(valid_tx_ant,
3036                                                    &new_rate, &tbl_type))
3037                                 ant_toggle_cnt = 1;
3038
3039                         repeat_rate = IWL_NUMBER_TRY;
3040                 } else {
3041                         repeat_rate = IWL_HT_NUMBER_TRY;
3042                 }
3043
3044                 /* Don't allow HT rates after next pass.
3045                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3046                 use_ht_possible = 0;
3047
3048                 /* Override next rate if needed for debug purposes */
3049                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3050
3051                 /* Fill next table entry */
3052                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3053
3054                 index++;
3055                 repeat_rate--;
3056         }
3057
3058         lq_cmd->agg_params.agg_frame_cnt_limit =
3059                 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3060         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3061
3062         lq_cmd->agg_params.agg_time_limit =
3063                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3064         /*
3065          * overwrite if needed, pass aggregation time limit
3066          * to uCode in uSec
3067          */
3068         if (priv && priv->cfg->bt_params &&
3069             priv->cfg->bt_params->agg_time_limit &&
3070             priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3071                 lq_cmd->agg_params.agg_time_limit =
3072                         cpu_to_le16(priv->cfg->bt_params->agg_time_limit);
3073 }
3074
3075 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3076 {
3077         return hw->priv;
3078 }
3079 /* rate scale requires free function to be implemented */
3080 static void rs_free(void *priv_rate)
3081 {
3082         return;
3083 }
3084
3085 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3086                         void *priv_sta)
3087 {
3088         struct iwl_op_mode *op_mode __maybe_unused = priv_r;
3089         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
3090
3091         IWL_DEBUG_RATE(priv, "enter\n");
3092         IWL_DEBUG_RATE(priv, "leave\n");
3093 }
3094
3095 #ifdef CONFIG_MAC80211_DEBUGFS
3096 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3097                              u32 *rate_n_flags, int index)
3098 {
3099         struct iwl_priv *priv;
3100         u8 valid_tx_ant;
3101         u8 ant_sel_tx;
3102
3103         priv = lq_sta->drv;
3104         valid_tx_ant = priv->eeprom_data->valid_tx_ant;
3105         if (lq_sta->dbg_fixed_rate) {
3106                 ant_sel_tx =
3107                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3108                   >> RATE_MCS_ANT_POS);
3109                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3110                         *rate_n_flags = lq_sta->dbg_fixed_rate;
3111                         IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3112                 } else {
3113                         lq_sta->dbg_fixed_rate = 0;
3114                         IWL_ERR(priv,
3115                             "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3116                             ant_sel_tx, valid_tx_ant);
3117                         IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3118                 }
3119         } else {
3120                 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3121         }
3122 }
3123
3124 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3125                         const char __user *user_buf, size_t count, loff_t *ppos)
3126 {
3127         struct iwl_lq_sta *lq_sta = file->private_data;
3128         struct iwl_priv *priv;
3129         char buf[64];
3130         size_t buf_size;
3131         u32 parsed_rate;
3132
3133
3134         priv = lq_sta->drv;
3135         memset(buf, 0, sizeof(buf));
3136         buf_size = min(count, sizeof(buf) -  1);
3137         if (copy_from_user(buf, user_buf, buf_size))
3138                 return -EFAULT;
3139
3140         if (sscanf(buf, "%x", &parsed_rate) == 1)
3141                 lq_sta->dbg_fixed_rate = parsed_rate;
3142         else
3143                 lq_sta->dbg_fixed_rate = 0;
3144
3145         rs_program_fix_rate(priv, lq_sta);
3146
3147         return count;
3148 }
3149
3150 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3151                         char __user *user_buf, size_t count, loff_t *ppos)
3152 {
3153         char *buff;
3154         int desc = 0;
3155         int i = 0;
3156         int index = 0;
3157         ssize_t ret;
3158
3159         struct iwl_lq_sta *lq_sta = file->private_data;
3160         struct iwl_priv *priv;
3161         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3162
3163         priv = lq_sta->drv;
3164         buff = kmalloc(1024, GFP_KERNEL);
3165         if (!buff)
3166                 return -ENOMEM;
3167
3168         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3169         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3170                         lq_sta->total_failed, lq_sta->total_success,
3171                         lq_sta->active_legacy_rate);
3172         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3173                         lq_sta->dbg_fixed_rate);
3174         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3175             (priv->eeprom_data->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3176             (priv->eeprom_data->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3177             (priv->eeprom_data->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3178         desc += sprintf(buff+desc, "lq type %s\n",
3179            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3180         if (is_Ht(tbl->lq_type)) {
3181                 desc += sprintf(buff+desc, " %s",
3182                    (is_siso(tbl->lq_type)) ? "SISO" :
3183                    ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3184                    desc += sprintf(buff+desc, " %s",
3185                    (tbl->is_ht40) ? "40MHz" : "20MHz");
3186                    desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3187                    (lq_sta->is_green) ? "GF enabled" : "",
3188                    (lq_sta->is_agg) ? "AGG on" : "");
3189         }
3190         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3191                 lq_sta->last_rate_n_flags);
3192         desc += sprintf(buff+desc, "general:"
3193                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3194                 lq_sta->lq.general_params.flags,
3195                 lq_sta->lq.general_params.mimo_delimiter,
3196                 lq_sta->lq.general_params.single_stream_ant_msk,
3197                 lq_sta->lq.general_params.dual_stream_ant_msk);
3198
3199         desc += sprintf(buff+desc, "agg:"
3200                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3201                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3202                         lq_sta->lq.agg_params.agg_dis_start_th,
3203                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
3204
3205         desc += sprintf(buff+desc,
3206                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3207                         lq_sta->lq.general_params.start_rate_index[0],
3208                         lq_sta->lq.general_params.start_rate_index[1],
3209                         lq_sta->lq.general_params.start_rate_index[2],
3210                         lq_sta->lq.general_params.start_rate_index[3]);
3211
3212         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3213                 index = iwl_hwrate_to_plcp_idx(
3214                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3215                 if (is_legacy(tbl->lq_type)) {
3216                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3217                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3218                                 iwl_rate_mcs[index].mbps);
3219                 } else {
3220                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3221                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3222                                 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3223                 }
3224         }
3225
3226         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3227         kfree(buff);
3228         return ret;
3229 }
3230
3231 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3232         .write = rs_sta_dbgfs_scale_table_write,
3233         .read = rs_sta_dbgfs_scale_table_read,
3234         .open = simple_open,
3235         .llseek = default_llseek,
3236 };
3237 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3238                         char __user *user_buf, size_t count, loff_t *ppos)
3239 {
3240         char *buff;
3241         int desc = 0;
3242         int i, j;
3243         ssize_t ret;
3244
3245         struct iwl_lq_sta *lq_sta = file->private_data;
3246
3247         buff = kmalloc(1024, GFP_KERNEL);
3248         if (!buff)
3249                 return -ENOMEM;
3250
3251         for (i = 0; i < LQ_SIZE; i++) {
3252                 desc += sprintf(buff+desc,
3253                                 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3254                                 "rate=0x%X\n",
3255                                 lq_sta->active_tbl == i ? "*" : "x",
3256                                 lq_sta->lq_info[i].lq_type,
3257                                 lq_sta->lq_info[i].is_SGI,
3258                                 lq_sta->lq_info[i].is_ht40,
3259                                 lq_sta->lq_info[i].is_dup,
3260                                 lq_sta->is_green,
3261                                 lq_sta->lq_info[i].current_rate);
3262                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3263                         desc += sprintf(buff+desc,
3264                                 "counter=%d success=%d %%=%d\n",
3265                                 lq_sta->lq_info[i].win[j].counter,
3266                                 lq_sta->lq_info[i].win[j].success_counter,
3267                                 lq_sta->lq_info[i].win[j].success_ratio);
3268                 }
3269         }
3270         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3271         kfree(buff);
3272         return ret;
3273 }
3274
3275 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3276         .read = rs_sta_dbgfs_stats_table_read,
3277         .open = simple_open,
3278         .llseek = default_llseek,
3279 };
3280
3281 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3282                         char __user *user_buf, size_t count, loff_t *ppos)
3283 {
3284         struct iwl_lq_sta *lq_sta = file->private_data;
3285         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3286         char buff[120];
3287         int desc = 0;
3288
3289         if (is_Ht(tbl->lq_type))
3290                 desc += sprintf(buff+desc,
3291                                 "Bit Rate= %d Mb/s\n",
3292                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3293         else
3294                 desc += sprintf(buff+desc,
3295                                 "Bit Rate= %d Mb/s\n",
3296                                 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3297
3298         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3299 }
3300
3301 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3302         .read = rs_sta_dbgfs_rate_scale_data_read,
3303         .open = simple_open,
3304         .llseek = default_llseek,
3305 };
3306
3307 static void rs_add_debugfs(void *priv, void *priv_sta,
3308                                         struct dentry *dir)
3309 {
3310         struct iwl_lq_sta *lq_sta = priv_sta;
3311         lq_sta->rs_sta_dbgfs_scale_table_file =
3312                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3313                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3314         lq_sta->rs_sta_dbgfs_stats_table_file =
3315                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3316                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
3317         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3318                 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3319                         lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3320         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3321                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3322                 &lq_sta->tx_agg_tid_en);
3323
3324 }
3325
3326 static void rs_remove_debugfs(void *priv, void *priv_sta)
3327 {
3328         struct iwl_lq_sta *lq_sta = priv_sta;
3329         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3330         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3331         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3332         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3333 }
3334 #endif
3335
3336 /*
3337  * Initialization of rate scaling information is done by driver after
3338  * the station is added. Since mac80211 calls this function before a
3339  * station is added we ignore it.
3340  */
3341 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3342                          struct ieee80211_sta *sta, void *priv_sta)
3343 {
3344 }
3345 static struct rate_control_ops rs_ops = {
3346         .module = NULL,
3347         .name = RS_NAME,
3348         .tx_status = rs_tx_status,
3349         .get_rate = rs_get_rate,
3350         .rate_init = rs_rate_init_stub,
3351         .alloc = rs_alloc,
3352         .free = rs_free,
3353         .alloc_sta = rs_alloc_sta,
3354         .free_sta = rs_free_sta,
3355 #ifdef CONFIG_MAC80211_DEBUGFS
3356         .add_sta_debugfs = rs_add_debugfs,
3357         .remove_sta_debugfs = rs_remove_debugfs,
3358 #endif
3359 };
3360
3361 int iwlagn_rate_control_register(void)
3362 {
3363         return ieee80211_rate_control_register(&rs_ops);
3364 }
3365
3366 void iwlagn_rate_control_unregister(void)
3367 {
3368         ieee80211_rate_control_unregister(&rs_ops);
3369 }
3370