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