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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2013 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/slab.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37
  38 #include "dev.h"
  39 #include "agn.h"
  40
  41 #define RS_NAME "iwl-agn-rs"
  42
  43 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  44 #define IWL_NUMBER_TRY      1
  45 #define IWL_HT_NUMBER_TRY   3
  46
  47 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  48 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  49 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  50
  51 /* max allowed rate miss before sync LQ cmd */
  52 #define IWL_MISSED_RATE_MAX             15
  53 /* max time to accum history 2 seconds */
  54 #define IWL_RATE_SCALE_FLUSH_INTVL   (3*HZ)
  55
  56 static u8 rs_ht_to_legacy[] = {
  57         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  58         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  59         IWL_RATE_6M_INDEX,
  60         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  61         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  62         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  63         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  64 };
  65
  66 static const u8 ant_toggle_lookup[] = {
  67         /*ANT_NONE -> */ ANT_NONE,
  68         /*ANT_A    -> */ ANT_B,
  69         /*ANT_B    -> */ ANT_C,
  70         /*ANT_AB   -> */ ANT_BC,
  71         /*ANT_C    -> */ ANT_A,
  72         /*ANT_AC   -> */ ANT_AB,
  73         /*ANT_BC   -> */ ANT_AC,
  74         /*ANT_ABC  -> */ ANT_ABC,
  75 };
  76
  77 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
  78         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
  79                                     IWL_RATE_SISO_##s##M_PLCP, \
  80                                     IWL_RATE_MIMO2_##s##M_PLCP,\
  81                                     IWL_RATE_MIMO3_##s##M_PLCP,\
  82                                     IWL_RATE_##r##M_IEEE,      \
  83                                     IWL_RATE_##ip##M_INDEX,    \
  84                                     IWL_RATE_##in##M_INDEX,    \
  85                                     IWL_RATE_##rp##M_INDEX,    \
  86                                     IWL_RATE_##rn##M_INDEX,    \
  87                                     IWL_RATE_##pp##M_INDEX,    \
  88                                     IWL_RATE_##np##M_INDEX }
  89
  90 /*
  91  * Parameter order:
  92  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
  93  *
  94  * If there isn't a valid next or previous rate then INV is used which
  95  * maps to IWL_RATE_INVALID
  96  *
  97  */
  98 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
  99         IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),    /*  1mbps */
 100         IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
 101         IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
 102         IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
 103         IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
 104         IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
 105         IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
 106         IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
 107         IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
 108         IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
 109         IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
 110         IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
 111         IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
 112         /* FIXME:RS:          ^^    should be INV (legacy) */
 113 };
 114
 115 static inline u8 rs_extract_rate(u32 rate_n_flags)
 116 {
 117         return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
 118 }
 119
 120 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 121 {
 122         int idx = 0;
 123
 124         /* HT rate format */
 125         if (rate_n_flags & RATE_MCS_HT_MSK) {
 126                 idx = rs_extract_rate(rate_n_flags);
 127
 128                 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
 129                         idx = idx - IWL_RATE_MIMO3_6M_PLCP;
 130                 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
 131                         idx = idx - IWL_RATE_MIMO2_6M_PLCP;
 132
 133                 idx += IWL_FIRST_OFDM_RATE;
 134                 /* skip 9M not supported in ht*/
 135                 if (idx >= IWL_RATE_9M_INDEX)
 136                         idx += 1;
 137                 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
 138                         return idx;
 139
 140         /* legacy rate format, search for match in table */
 141         } else {
 142                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 143                         if (iwl_rates[idx].plcp ==
 144                                         rs_extract_rate(rate_n_flags))
 145                                 return idx;
 146         }
 147
 148         return -1;
 149 }
 150
 151 static void rs_rate_scale_perform(struct iwl_priv *priv,
 152                                    struct sk_buff *skb,
 153                                    struct ieee80211_sta *sta,
 154                                    struct iwl_lq_sta *lq_sta);
 155 static void rs_fill_link_cmd(struct iwl_priv *priv,
 156                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 157 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 158
 159
 160 #ifdef CONFIG_MAC80211_DEBUGFS
 161 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 162                              u32 *rate_n_flags, int index);
 163 #else
 164 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 165                              u32 *rate_n_flags, int index)
 166 {}
 167 #endif
 168
 169 /**
 170  * The following tables contain the expected throughput metrics for all rates
 171  *
 172  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 173  *
 174  * where invalid entries are zeros.
 175  *
 176  * CCK rates are only valid in legacy table and will only be used in G
 177  * (2.4 GHz) band.
 178  */
 179
 180 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
 181         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 182 };
 183
 184 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
 185         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202}, /* Norm */
 186         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210}, /* SGI */
 187         {0, 0, 0, 0, 47, 0,  91, 133, 171, 242, 305, 334, 362}, /* AGG */
 188         {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
 189 };
 190
 191 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
 192         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 193         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 194         {0, 0, 0, 0,  94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
 195         {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
 196 };
 197
 198 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 199         {0, 0, 0, 0,  74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
 200         {0, 0, 0, 0,  81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
 201         {0, 0, 0, 0,  89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
 202         {0, 0, 0, 0,  97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
 203 };
 204
 205 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 206         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
 207         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
 208         {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
 209         {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
 210 };
 211
 212 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
 213         {0, 0, 0, 0,  99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
 214         {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
 215         {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
 216         {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
 217 };
 218
 219 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
 220         {0, 0, 0, 0, 152, 0, 211, 239, 255, 279,  290,  294,  297}, /* Norm */
 221         {0, 0, 0, 0, 160, 0, 219, 245, 261, 284,  294,  297,  300}, /* SGI */
 222         {0, 0, 0, 0, 254, 0, 443, 584, 695, 868,  984, 1030, 1070}, /* AGG */
 223         {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
 224 };
 225
 226 /* mbps, mcs */
 227 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 228         {  "1", "BPSK DSSS"},
 229         {  "2", "QPSK DSSS"},
 230         {"5.5", "BPSK CCK"},
 231         { "11", "QPSK CCK"},
 232         {  "6", "BPSK 1/2"},
 233         {  "9", "BPSK 1/2"},
 234         { "12", "QPSK 1/2"},
 235         { "18", "QPSK 3/4"},
 236         { "24", "16QAM 1/2"},
 237         { "36", "16QAM 3/4"},
 238         { "48", "64QAM 2/3"},
 239         { "54", "64QAM 3/4"},
 240         { "60", "64QAM 5/6"},
 241 };
 242
 243 #define MCS_INDEX_PER_STREAM    (8)
 244
 245 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 246 {
 247         window->data = 0;
 248         window->success_counter = 0;
 249         window->success_ratio = IWL_INVALID_VALUE;
 250         window->counter = 0;
 251         window->average_tpt = IWL_INVALID_VALUE;
 252         window->stamp = 0;
 253 }
 254
 255 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 256 {
 257         return (ant_type & valid_antenna) == ant_type;
 258 }
 259
 260 /*
 261  *      removes the old data from the statistics. All data that is older than
 262  *      TID_MAX_TIME_DIFF, will be deleted.
 263  */
 264 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 265 {
 266         /* The oldest age we want to keep */
 267         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 268
 269         while (tl->queue_count &&
 270                (tl->time_stamp < oldest_time)) {
 271                 tl->total -= tl->packet_count[tl->head];
 272                 tl->packet_count[tl->head] = 0;
 273                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 274                 tl->queue_count--;
 275                 tl->head++;
 276                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 277                         tl->head = 0;
 278         }
 279 }
 280
 281 /*
 282  *      increment traffic load value for tid and also remove
 283  *      any old values if passed the certain time period
 284  */
 285 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 286                            struct ieee80211_hdr *hdr)
 287 {
 288         u32 curr_time = jiffies_to_msecs(jiffies);
 289         u32 time_diff;
 290         s32 index;
 291         struct iwl_traffic_load *tl = NULL;
 292         u8 tid;
 293
 294         if (ieee80211_is_data_qos(hdr->frame_control)) {
 295                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 296                 tid = qc[0] & 0xf;
 297         } else
 298                 return IWL_MAX_TID_COUNT;
 299
 300         if (unlikely(tid >= IWL_MAX_TID_COUNT))
 301                 return IWL_MAX_TID_COUNT;
 302
 303         tl = &lq_data->load[tid];
 304
 305         curr_time -= curr_time % TID_ROUND_VALUE;
 306
 307         /* Happens only for the first packet. Initialize the data */
 308         if (!(tl->queue_count)) {
 309                 tl->total = 1;
 310                 tl->time_stamp = curr_time;
 311                 tl->queue_count = 1;
 312                 tl->head = 0;
 313                 tl->packet_count[0] = 1;
 314                 return IWL_MAX_TID_COUNT;
 315         }
 316
 317         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 318         index = time_diff / TID_QUEUE_CELL_SPACING;
 319
 320         /* The history is too long: remove data that is older than */
 321         /* TID_MAX_TIME_DIFF */
 322         if (index >= TID_QUEUE_MAX_SIZE)
 323                 rs_tl_rm_old_stats(tl, curr_time);
 324
 325         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 326         tl->packet_count[index] = tl->packet_count[index] + 1;
 327         tl->total = tl->total + 1;
 328
 329         if ((index + 1) > tl->queue_count)
 330                 tl->queue_count = index + 1;
 331
 332         return tid;
 333 }
 334
 335 #ifdef CONFIG_MAC80211_DEBUGFS
 336 /**
 337  * Program the device to use fixed rate for frame transmit
 338  * This is for debugging/testing only
 339  * once the device start use fixed rate, we need to reload the module
 340  * to being back the normal operation.
 341  */
 342 static void rs_program_fix_rate(struct iwl_priv *priv,
 343                                 struct iwl_lq_sta *lq_sta)
 344 {
 345         struct iwl_station_priv *sta_priv =
 346                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
 347         struct iwl_rxon_context *ctx = sta_priv->ctx;
 348
 349         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
 350         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 351         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 352         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 353
 354 #ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE
 355         /* testmode has higher priority to overwirte the fixed rate */
 356         if (priv->tm_fixed_rate)
 357                 lq_sta->dbg_fixed_rate = priv->tm_fixed_rate;
 358 #endif
 359
 360         IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
 361                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
 362
 363         if (lq_sta->dbg_fixed_rate) {
 364                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
 365                 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
 366                                 false);
 367         }
 368 }
 369 #endif
 370
 371 /*
 372         get the traffic load value for tid
 373 */
 374 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 375 {
 376         u32 curr_time = jiffies_to_msecs(jiffies);
 377         u32 time_diff;
 378         s32 index;
 379         struct iwl_traffic_load *tl = NULL;
 380
 381         if (tid >= IWL_MAX_TID_COUNT)
 382                 return 0;
 383
 384         tl = &(lq_data->load[tid]);
 385
 386         curr_time -= curr_time % TID_ROUND_VALUE;
 387
 388         if (!(tl->queue_count))
 389                 return 0;
 390
 391         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 392         index = time_diff / TID_QUEUE_CELL_SPACING;
 393
 394         /* The history is too long: remove data that is older than */
 395         /* TID_MAX_TIME_DIFF */
 396         if (index >= TID_QUEUE_MAX_SIZE)
 397                 rs_tl_rm_old_stats(tl, curr_time);
 398
 399         return tl->total;
 400 }
 401
 402 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 403                                       struct iwl_lq_sta *lq_data, u8 tid,
 404                                       struct ieee80211_sta *sta)
 405 {
 406         int ret = -EAGAIN;
 407         u32 load;
 408
 409         /*
 410          * Don't create TX aggregation sessions when in high
 411          * BT traffic, as they would just be disrupted by BT.
 412          */
 413         if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
 414                 IWL_DEBUG_COEX(priv,
 415                                "BT traffic (%d), no aggregation allowed\n",
 416                                priv->bt_traffic_load);
 417                 return ret;
 418         }
 419
 420         load = rs_tl_get_load(lq_data, tid);
 421
 422         if ((iwlwifi_mod_params.auto_agg) || (load > IWL_AGG_LOAD_THRESHOLD)) {
 423                 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
 424                                 sta->addr, tid);
 425                 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 426                 if (ret == -EAGAIN) {
 427                         /*
 428                          * driver and mac80211 is out of sync
 429                          * this might be cause by reloading firmware
 430                          * stop the tx ba session here
 431                          */
 432                         IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
 433                                 tid);
 434                         ieee80211_stop_tx_ba_session(sta, tid);
 435                 }
 436         } else {
 437                 IWL_DEBUG_HT(priv, "Aggregation not enabled for tid %d "
 438                         "because load = %u\n", tid, load);
 439         }
 440         return ret;
 441 }
 442
 443 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 444                               struct iwl_lq_sta *lq_data,
 445                               struct ieee80211_sta *sta)
 446 {
 447         if (tid < IWL_MAX_TID_COUNT)
 448                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 449         else
 450                 IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n",
 451                         tid, IWL_MAX_TID_COUNT);
 452 }
 453
 454 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 455 {
 456         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 457                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 458                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 459 }
 460
 461 /*
 462  * Static function to get the expected throughput from an iwl_scale_tbl_info
 463  * that wraps a NULL pointer check
 464  */
 465 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 466 {
 467         if (tbl->expected_tpt)
 468                 return tbl->expected_tpt[rs_index];
 469         return 0;
 470 }
 471
 472 /**
 473  * rs_collect_tx_data - Update the success/failure sliding window
 474  *
 475  * We keep a sliding window of the last 62 packets transmitted
 476  * at this rate.  window->data contains the bitmask of successful
 477  * packets.
 478  */
 479 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 480                               int scale_index, int attempts, int successes)
 481 {
 482         struct iwl_rate_scale_data *window = NULL;
 483         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 484         s32 fail_count, tpt;
 485
 486         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 487                 return -EINVAL;
 488
 489         /* Select window for current tx bit rate */
 490         window = &(tbl->win[scale_index]);
 491
 492         /* Get expected throughput */
 493         tpt = get_expected_tpt(tbl, scale_index);
 494
 495         /*
 496          * Keep track of only the latest 62 tx frame attempts in this rate's
 497          * history window; anything older isn't really relevant any more.
 498          * If we have filled up the sliding window, drop the oldest attempt;
 499          * if the oldest attempt (highest bit in bitmap) shows "success",
 500          * subtract "1" from the success counter (this is the main reason
 501          * we keep these bitmaps!).
 502          */
 503         while (attempts > 0) {
 504                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 505
 506                         /* remove earliest */
 507                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 508
 509                         if (window->data & mask) {
 510                                 window->data &= ~mask;
 511                                 window->success_counter--;
 512                         }
 513                 }
 514
 515                 /* Increment frames-attempted counter */
 516                 window->counter++;
 517
 518                 /* Shift bitmap by one frame to throw away oldest history */
 519                 window->data <<= 1;
 520
 521                 /* Mark the most recent #successes attempts as successful */
 522                 if (successes > 0) {
 523                         window->success_counter++;
 524                         window->data |= 0x1;
 525                         successes--;
 526                 }
 527
 528                 attempts--;
 529         }
 530
 531         /* Calculate current success ratio, avoid divide-by-0! */
 532         if (window->counter > 0)
 533                 window->success_ratio = 128 * (100 * window->success_counter)
 534                                         / window->counter;
 535         else
 536                 window->success_ratio = IWL_INVALID_VALUE;
 537
 538         fail_count = window->counter - window->success_counter;
 539
 540         /* Calculate average throughput, if we have enough history. */
 541         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 542             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 543                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 544         else
 545                 window->average_tpt = IWL_INVALID_VALUE;
 546
 547         /* Tag this window as having been updated */
 548         window->stamp = jiffies;
 549
 550         return 0;
 551 }
 552
 553 /*
 554  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 555  */
 556 /* FIXME:RS:remove this function and put the flags statically in the table */
 557 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
 558                                  struct iwl_scale_tbl_info *tbl,
 559                                  int index, u8 use_green)
 560 {
 561         u32 rate_n_flags = 0;
 562
 563         if (is_legacy(tbl->lq_type)) {
 564                 rate_n_flags = iwl_rates[index].plcp;
 565                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 566                         rate_n_flags |= RATE_MCS_CCK_MSK;
 567
 568         } else if (is_Ht(tbl->lq_type)) {
 569                 if (index > IWL_LAST_OFDM_RATE) {
 570                         IWL_ERR(priv, "Invalid HT rate index %d\n", index);
 571                         index = IWL_LAST_OFDM_RATE;
 572                 }
 573                 rate_n_flags = RATE_MCS_HT_MSK;
 574
 575                 if (is_siso(tbl->lq_type))
 576                         rate_n_flags |= iwl_rates[index].plcp_siso;
 577                 else if (is_mimo2(tbl->lq_type))
 578                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 579                 else
 580                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 581         } else {
 582                 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 583         }
 584
 585         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 586                                                      RATE_MCS_ANT_ABC_MSK);
 587
 588         if (is_Ht(tbl->lq_type)) {
 589                 if (tbl->is_ht40) {
 590                         if (tbl->is_dup)
 591                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 592                         else
 593                                 rate_n_flags |= RATE_MCS_HT40_MSK;
 594                 }
 595                 if (tbl->is_SGI)
 596                         rate_n_flags |= RATE_MCS_SGI_MSK;
 597
 598                 if (use_green) {
 599                         rate_n_flags |= RATE_MCS_GF_MSK;
 600                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 601                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 602                                 IWL_ERR(priv, "GF was set with SGI:SISO\n");
 603                         }
 604                 }
 605         }
 606         return rate_n_flags;
 607 }
 608
 609 /*
 610  * Interpret uCode API's rate_n_flags format,
 611  * fill "search" or "active" tx mode table.
 612  */
 613 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 614                                     enum ieee80211_band band,
 615                                     struct iwl_scale_tbl_info *tbl,
 616                                     int *rate_idx)
 617 {
 618         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 619         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 620         u8 mcs;
 621
 622         memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
 623         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 624
 625         if (*rate_idx  == IWL_RATE_INVALID) {
 626                 *rate_idx = -1;
 627                 return -EINVAL;
 628         }
 629         tbl->is_SGI = 0;        /* default legacy setup */
 630         tbl->is_ht40 = 0;
 631         tbl->is_dup = 0;
 632         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 633         tbl->lq_type = LQ_NONE;
 634         tbl->max_search = IWL_MAX_SEARCH;
 635
 636         /* legacy rate format */
 637         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 638                 if (num_of_ant == 1) {
 639                         if (band == IEEE80211_BAND_5GHZ)
 640                                 tbl->lq_type = LQ_A;
 641                         else
 642                                 tbl->lq_type = LQ_G;
 643                 }
 644         /* HT rate format */
 645         } else {
 646                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 647                         tbl->is_SGI = 1;
 648
 649                 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
 650                     (rate_n_flags & RATE_MCS_DUP_MSK))
 651                         tbl->is_ht40 = 1;
 652
 653                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 654                         tbl->is_dup = 1;
 655
 656                 mcs = rs_extract_rate(rate_n_flags);
 657
 658                 /* SISO */
 659                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 660                         if (num_of_ant == 1)
 661                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 662                 /* MIMO2 */
 663                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 664                         if (num_of_ant == 2)
 665                                 tbl->lq_type = LQ_MIMO2;
 666                 /* MIMO3 */
 667                 } else {
 668                         if (num_of_ant == 3) {
 669                                 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
 670                                 tbl->lq_type = LQ_MIMO3;
 671                         }
 672                 }
 673         }
 674         return 0;
 675 }
 676
 677 /* switch to another antenna/antennas and return 1 */
 678 /* if no other valid antenna found, return 0 */
 679 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 680                              struct iwl_scale_tbl_info *tbl)
 681 {
 682         u8 new_ant_type;
 683
 684         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 685                 return 0;
 686
 687         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 688                 return 0;
 689
 690         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 691
 692         while ((new_ant_type != tbl->ant_type) &&
 693                !rs_is_valid_ant(valid_ant, new_ant_type))
 694                 new_ant_type = ant_toggle_lookup[new_ant_type];
 695
 696         if (new_ant_type == tbl->ant_type)
 697                 return 0;
 698
 699         tbl->ant_type = new_ant_type;
 700         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 701         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 702         return 1;
 703 }
 704
 705 /**
 706  * Green-field mode is valid if the station supports it and
 707  * there are no non-GF stations present in the BSS.
 708  */
 709 static bool rs_use_green(struct ieee80211_sta *sta)
 710 {
 711         /*
 712          * There's a bug somewhere in this code that causes the
 713          * scaling to get stuck because GF+SGI can't be combined
 714          * in SISO rates. Until we find that bug, disable GF, it
 715          * has only limited benefit and we still interoperate with
 716          * GF APs since we can always receive GF transmissions.
 717          */
 718         return false;
 719 }
 720
 721 /**
 722  * rs_get_supported_rates - get the available rates
 723  *
 724  * if management frame or broadcast frame only return
 725  * basic available rates.
 726  *
 727  */
 728 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 729                                   struct ieee80211_hdr *hdr,
 730                                   enum iwl_table_type rate_type)
 731 {
 732         if (is_legacy(rate_type)) {
 733                 return lq_sta->active_legacy_rate;
 734         } else {
 735                 if (is_siso(rate_type))
 736                         return lq_sta->active_siso_rate;
 737                 else if (is_mimo2(rate_type))
 738                         return lq_sta->active_mimo2_rate;
 739                 else
 740                         return lq_sta->active_mimo3_rate;
 741         }
 742 }
 743
 744 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 745                                 int rate_type)
 746 {
 747         u8 high = IWL_RATE_INVALID;
 748         u8 low = IWL_RATE_INVALID;
 749
 750         /* 802.11A or ht walks to the next literal adjacent rate in
 751          * the rate table */
 752         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 753                 int i;
 754                 u32 mask;
 755
 756                 /* Find the previous rate that is in the rate mask */
 757                 i = index - 1;
 758                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 759                         if (rate_mask & mask) {
 760                                 low = i;
 761                                 break;
 762                         }
 763                 }
 764
 765                 /* Find the next rate that is in the rate mask */
 766                 i = index + 1;
 767                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 768                         if (rate_mask & mask) {
 769                                 high = i;
 770                                 break;
 771                         }
 772                 }
 773
 774                 return (high << 8) | low;
 775         }
 776
 777         low = index;
 778         while (low != IWL_RATE_INVALID) {
 779                 low = iwl_rates[low].prev_rs;
 780                 if (low == IWL_RATE_INVALID)
 781                         break;
 782                 if (rate_mask & (1 << low))
 783                         break;
 784                 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
 785         }
 786
 787         high = index;
 788         while (high != IWL_RATE_INVALID) {
 789                 high = iwl_rates[high].next_rs;
 790                 if (high == IWL_RATE_INVALID)
 791                         break;
 792                 if (rate_mask & (1 << high))
 793                         break;
 794                 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
 795         }
 796
 797         return (high << 8) | low;
 798 }
 799
 800 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 801                              struct iwl_scale_tbl_info *tbl,
 802                              u8 scale_index, u8 ht_possible)
 803 {
 804         s32 low;
 805         u16 rate_mask;
 806         u16 high_low;
 807         u8 switch_to_legacy = 0;
 808         u8 is_green = lq_sta->is_green;
 809         struct iwl_priv *priv = lq_sta->drv;
 810
 811         /* check if we need to switch from HT to legacy rates.
 812          * assumption is that mandatory rates (1Mbps or 6Mbps)
 813          * are always supported (spec demand) */
 814         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 815                 switch_to_legacy = 1;
 816                 scale_index = rs_ht_to_legacy[scale_index];
 817                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 818                         tbl->lq_type = LQ_A;
 819                 else
 820                         tbl->lq_type = LQ_G;
 821
 822                 if (num_of_ant(tbl->ant_type) > 1)
 823                         tbl->ant_type =
 824                             first_antenna(priv->nvm_data->valid_tx_ant);
 825
 826                 tbl->is_ht40 = 0;
 827                 tbl->is_SGI = 0;
 828                 tbl->max_search = IWL_MAX_SEARCH;
 829         }
 830
 831         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 832
 833         /* Mask with station rate restriction */
 834         if (is_legacy(tbl->lq_type)) {
 835                 /* supp_rates has no CCK bits in A mode */
 836                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 837                         rate_mask  = (u16)(rate_mask &
 838                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 839                 else
 840                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 841         }
 842
 843         /* If we switched from HT to legacy, check current rate */
 844         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 845                 low = scale_index;
 846                 goto out;
 847         }
 848
 849         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 850                                         tbl->lq_type);
 851         low = high_low & 0xff;
 852
 853         if (low == IWL_RATE_INVALID)
 854                 low = scale_index;
 855
 856 out:
 857         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 858 }
 859
 860 /*
 861  * Simple function to compare two rate scale table types
 862  */
 863 static bool table_type_matches(struct iwl_scale_tbl_info *a,
 864                                struct iwl_scale_tbl_info *b)
 865 {
 866         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 867                 (a->is_SGI == b->is_SGI);
 868 }
 869
 870 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 871                             struct iwl_lq_sta *lq_sta)
 872 {
 873         struct iwl_scale_tbl_info *tbl;
 874         bool full_concurrent = priv->bt_full_concurrent;
 875
 876         if (priv->bt_ant_couple_ok) {
 877                 /*
 878                  * Is there a need to switch between
 879                  * full concurrency and 3-wire?
 880                  */
 881                 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
 882                         full_concurrent = true;
 883                 else
 884                         full_concurrent = false;
 885         }
 886         if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
 887             (priv->bt_full_concurrent != full_concurrent)) {
 888                 priv->bt_full_concurrent = full_concurrent;
 889                 priv->last_bt_traffic_load = priv->bt_traffic_load;
 890
 891                 /* Update uCode's rate table. */
 892                 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 893                 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
 894                 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 895
 896                 queue_work(priv->workqueue, &priv->bt_full_concurrency);
 897         }
 898 }
 899
 900 /*
 901  * mac80211 sends us Tx status
 902  */
 903 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 904                          struct ieee80211_sta *sta, void *priv_sta,
 905                          struct sk_buff *skb)
 906 {
 907         int legacy_success;
 908         int retries;
 909         int rs_index, mac_index, i;
 910         struct iwl_lq_sta *lq_sta = priv_sta;
 911         struct iwl_link_quality_cmd *table;
 912         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 913         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r;
 914         struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
 915         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 916         enum mac80211_rate_control_flags mac_flags;
 917         u32 tx_rate;
 918         struct iwl_scale_tbl_info tbl_type;
 919         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 920         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 921         struct iwl_rxon_context *ctx = sta_priv->ctx;
 922
 923         IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
 924
 925         /* Treat uninitialized rate scaling data same as non-existing. */
 926         if (!lq_sta) {
 927                 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
 928                 return;
 929         } else if (!lq_sta->drv) {
 930                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
 931                 return;
 932         }
 933
 934         if (!ieee80211_is_data(hdr->frame_control) ||
 935             info->flags & IEEE80211_TX_CTL_NO_ACK)
 936                 return;
 937
 938         /* This packet was aggregated but doesn't carry status info */
 939         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 940             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 941                 return;
 942
 943         /*
 944          * Ignore this Tx frame response if its initial rate doesn't match
 945          * that of latest Link Quality command.  There may be stragglers
 946          * from a previous Link Quality command, but we're no longer interested
 947          * in those; they're either from the "active" mode while we're trying
 948          * to check "search" mode, or a prior "search" mode after we've moved
 949          * to a new "search" mode (which might become the new "active" mode).
 950          */
 951         table = &lq_sta->lq;
 952         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 953         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 954         if (priv->band == IEEE80211_BAND_5GHZ)
 955                 rs_index -= IWL_FIRST_OFDM_RATE;
 956         mac_flags = info->status.rates[0].flags;
 957         mac_index = info->status.rates[0].idx;
 958         /* For HT packets, map MCS to PLCP */
 959         if (mac_flags & IEEE80211_TX_RC_MCS) {
 960                 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
 961                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 962                         mac_index++;
 963                 /*
 964                  * mac80211 HT index is always zero-indexed; we need to move
 965                  * HT OFDM rates after CCK rates in 2.4 GHz band
 966                  */
 967                 if (priv->band == IEEE80211_BAND_2GHZ)
 968                         mac_index += IWL_FIRST_OFDM_RATE;
 969         }
 970         /* Here we actually compare this rate to the latest LQ command */
 971         if ((mac_index < 0) ||
 972             (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 973             (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 974             (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
 975             (tbl_type.ant_type != info->status.antenna) ||
 976             (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 977             (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 978             (rs_index != mac_index)) {
 979                 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
 980                 /*
 981                  * Since rates mis-match, the last LQ command may have failed.
 982                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 983                  * ... driver.
 984                  */
 985                 lq_sta->missed_rate_counter++;
 986                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 987                         lq_sta->missed_rate_counter = 0;
 988                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 989                 }
 990                 /* Regardless, ignore this status info for outdated rate */
 991                 return;
 992         } else
 993                 /* Rate did match, so reset the missed_rate_counter */
 994                 lq_sta->missed_rate_counter = 0;
 995
 996         /* Figure out if rate scale algorithm is in active or search table */
 997         if (table_type_matches(&tbl_type,
 998                                 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 999                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1000                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1001         } else if (table_type_matches(&tbl_type,
1002                                 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
1003                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1004                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1005         } else {
1006                 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
1007                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1008                 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
1009                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1010                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1011                 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1012                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1013                 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1014                         tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1015                 /*
1016                  * no matching table found, let's by-pass the data collection
1017                  * and continue to perform rate scale to find the rate table
1018                  */
1019                 rs_stay_in_table(lq_sta, true);
1020                 goto done;
1021         }
1022
1023         /*
1024          * Updating the frame history depends on whether packets were
1025          * aggregated.
1026          *
1027          * For aggregation, all packets were transmitted at the same rate, the
1028          * first index into rate scale table.
1029          */
1030         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1031                 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1032                 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1033                                 &rs_index);
1034                 rs_collect_tx_data(curr_tbl, rs_index,
1035                                    info->status.ampdu_len,
1036                                    info->status.ampdu_ack_len);
1037
1038                 /* Update success/fail counts if not searching for new mode */
1039                 if (lq_sta->stay_in_tbl) {
1040                         lq_sta->total_success += info->status.ampdu_ack_len;
1041                         lq_sta->total_failed += (info->status.ampdu_len -
1042                                         info->status.ampdu_ack_len);
1043                 }
1044         } else {
1045         /*
1046          * For legacy, update frame history with for each Tx retry.
1047          */
1048                 retries = info->status.rates[0].count - 1;
1049                 /* HW doesn't send more than 15 retries */
1050                 retries = min(retries, 15);
1051
1052                 /* The last transmission may have been successful */
1053                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1054                 /* Collect data for each rate used during failed TX attempts */
1055                 for (i = 0; i <= retries; ++i) {
1056                         tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1057                         rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1058                                         &tbl_type, &rs_index);
1059                         /*
1060                          * Only collect stats if retried rate is in the same RS
1061                          * table as active/search.
1062                          */
1063                         if (table_type_matches(&tbl_type, curr_tbl))
1064                                 tmp_tbl = curr_tbl;
1065                         else if (table_type_matches(&tbl_type, other_tbl))
1066                                 tmp_tbl = other_tbl;
1067                         else
1068                                 continue;
1069                         rs_collect_tx_data(tmp_tbl, rs_index, 1,
1070                                            i < retries ? 0 : legacy_success);
1071                 }
1072
1073                 /* Update success/fail counts if not searching for new mode */
1074                 if (lq_sta->stay_in_tbl) {
1075                         lq_sta->total_success += legacy_success;
1076                         lq_sta->total_failed += retries + (1 - legacy_success);
1077                 }
1078         }
1079         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1080         lq_sta->last_rate_n_flags = tx_rate;
1081 done:
1082         /* See if there's a better rate or modulation mode to try. */
1083         if (sta && sta->supp_rates[sband->band])
1084                 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1085
1086 #if defined(CONFIG_MAC80211_DEBUGFS) && defined(CONFIG_IWLWIFI_DEVICE_TESTMODE)
1087         if ((priv->tm_fixed_rate) &&
1088             (priv->tm_fixed_rate != lq_sta->dbg_fixed_rate))
1089                 rs_program_fix_rate(priv, lq_sta);
1090 #endif
1091         if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist)
1092                 rs_bt_update_lq(priv, ctx, lq_sta);
1093 }
1094
1095 /*
1096  * Begin a period of staying with a selected modulation mode.
1097  * Set "stay_in_tbl" flag to prevent any mode switches.
1098  * Set frame tx success limits according to legacy vs. high-throughput,
1099  * and reset overall (spanning all rates) tx success history statistics.
1100  * These control how long we stay using same modulation mode before
1101  * searching for a new mode.
1102  */
1103 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1104                                  struct iwl_lq_sta *lq_sta)
1105 {
1106         IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1107         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1108         if (is_legacy) {
1109                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1110                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1111                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1112         } else {
1113                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1114                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1115                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1116         }
1117         lq_sta->table_count = 0;
1118         lq_sta->total_failed = 0;
1119         lq_sta->total_success = 0;
1120         lq_sta->flush_timer = jiffies;
1121         lq_sta->action_counter = 0;
1122 }
1123
1124 /*
1125  * Find correct throughput table for given mode of modulation
1126  */
1127 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1128                                       struct iwl_scale_tbl_info *tbl)
1129 {
1130         /* Used to choose among HT tables */
1131         s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1132
1133         /* Check for invalid LQ type */
1134         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1135                 tbl->expected_tpt = expected_tpt_legacy;
1136                 return;
1137         }
1138
1139         /* Legacy rates have only one table */
1140         if (is_legacy(tbl->lq_type)) {
1141                 tbl->expected_tpt = expected_tpt_legacy;
1142                 return;
1143         }
1144
1145         /* Choose among many HT tables depending on number of streams
1146          * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1147          * status */
1148         if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1149                 ht_tbl_pointer = expected_tpt_siso20MHz;
1150         else if (is_siso(tbl->lq_type))
1151                 ht_tbl_pointer = expected_tpt_siso40MHz;
1152         else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1153                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1154         else if (is_mimo2(tbl->lq_type))
1155                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1156         else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1157                 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1158         else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1159                 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1160
1161         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
1162                 tbl->expected_tpt = ht_tbl_pointer[0];
1163         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1164                 tbl->expected_tpt = ht_tbl_pointer[1];
1165         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1166                 tbl->expected_tpt = ht_tbl_pointer[2];
1167         else                                            /* AGG+SGI */
1168                 tbl->expected_tpt = ht_tbl_pointer[3];
1169 }
1170
1171 /*
1172  * Find starting rate for new "search" high-throughput mode of modulation.
1173  * Goal is to find lowest expected rate (under perfect conditions) that is
1174  * above the current measured throughput of "active" mode, to give new mode
1175  * a fair chance to prove itself without too many challenges.
1176  *
1177  * This gets called when transitioning to more aggressive modulation
1178  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1179  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1180  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1181  * bit rate will typically need to increase, but not if performance was bad.
1182  */
1183 static s32 rs_get_best_rate(struct iwl_priv *priv,
1184                             struct iwl_lq_sta *lq_sta,
1185                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1186                             u16 rate_mask, s8 index)
1187 {
1188         /* "active" values */
1189         struct iwl_scale_tbl_info *active_tbl =
1190             &(lq_sta->lq_info[lq_sta->active_tbl]);
1191         s32 active_sr = active_tbl->win[index].success_ratio;
1192         s32 active_tpt = active_tbl->expected_tpt[index];
1193
1194         /* expected "search" throughput */
1195         s32 *tpt_tbl = tbl->expected_tpt;
1196
1197         s32 new_rate, high, low, start_hi;
1198         u16 high_low;
1199         s8 rate = index;
1200
1201         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1202
1203         for (; ;) {
1204                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1205                                                 tbl->lq_type);
1206
1207                 low = high_low & 0xff;
1208                 high = (high_low >> 8) & 0xff;
1209
1210                 /*
1211                  * Lower the "search" bit rate, to give new "search" mode
1212                  * approximately the same throughput as "active" if:
1213                  *
1214                  * 1) "Active" mode has been working modestly well (but not
1215                  *    great), and expected "search" throughput (under perfect
1216                  *    conditions) at candidate rate is above the actual
1217                  *    measured "active" throughput (but less than expected
1218                  *    "active" throughput under perfect conditions).
1219                  * OR
1220                  * 2) "Active" mode has been working perfectly or very well
1221                  *    and expected "search" throughput (under perfect
1222                  *    conditions) at candidate rate is above expected
1223                  *    "active" throughput (under perfect conditions).
1224                  */
1225                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1226                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1227                       (active_sr <= IWL_RATE_HIGH_TH) &&
1228                       (tpt_tbl[rate] <= active_tpt))) ||
1229                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1230                      (tpt_tbl[rate] > active_tpt))) {
1231
1232                         /* (2nd or later pass)
1233                          * If we've already tried to raise the rate, and are
1234                          * now trying to lower it, use the higher rate. */
1235                         if (start_hi != IWL_RATE_INVALID) {
1236                                 new_rate = start_hi;
1237                                 break;
1238                         }
1239
1240                         new_rate = rate;
1241
1242                         /* Loop again with lower rate */
1243                         if (low != IWL_RATE_INVALID)
1244                                 rate = low;
1245
1246                         /* Lower rate not available, use the original */
1247                         else
1248                                 break;
1249
1250                 /* Else try to raise the "search" rate to match "active" */
1251                 } else {
1252                         /* (2nd or later pass)
1253                          * If we've already tried to lower the rate, and are
1254                          * now trying to raise it, use the lower rate. */
1255                         if (new_rate != IWL_RATE_INVALID)
1256                                 break;
1257
1258                         /* Loop again with higher rate */
1259                         else if (high != IWL_RATE_INVALID) {
1260                                 start_hi = high;
1261                                 rate = high;
1262
1263                         /* Higher rate not available, use the original */
1264                         } else {
1265                                 new_rate = rate;
1266                                 break;
1267                         }
1268                 }
1269         }
1270
1271         return new_rate;
1272 }
1273
1274 /*
1275  * Set up search table for MIMO2
1276  */
1277 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1278                              struct iwl_lq_sta *lq_sta,
1279                              struct ieee80211_conf *conf,
1280                              struct ieee80211_sta *sta,
1281                              struct iwl_scale_tbl_info *tbl, int index)
1282 {
1283         u16 rate_mask;
1284         s32 rate;
1285         s8 is_green = lq_sta->is_green;
1286         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1287         struct iwl_rxon_context *ctx = sta_priv->ctx;
1288
1289         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1290                 return -1;
1291
1292         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1293                 return -1;
1294
1295         /* Need both Tx chains/antennas to support MIMO */
1296         if (priv->hw_params.tx_chains_num < 2)
1297                 return -1;
1298
1299         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1300
1301         tbl->lq_type = LQ_MIMO2;
1302         tbl->is_dup = lq_sta->is_dup;
1303         tbl->action = 0;
1304         tbl->max_search = IWL_MAX_SEARCH;
1305         rate_mask = lq_sta->active_mimo2_rate;
1306
1307         if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1308                 tbl->is_ht40 = 1;
1309         else
1310                 tbl->is_ht40 = 0;
1311
1312         rs_set_expected_tpt_table(lq_sta, tbl);
1313
1314         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1315
1316         IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1317         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1318                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1319                                                 rate, rate_mask);
1320                 return -1;
1321         }
1322         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1323
1324         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1325                      tbl->current_rate, is_green);
1326         return 0;
1327 }
1328
1329 /*
1330  * Set up search table for MIMO3
1331  */
1332 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1333                              struct iwl_lq_sta *lq_sta,
1334                              struct ieee80211_conf *conf,
1335                              struct ieee80211_sta *sta,
1336                              struct iwl_scale_tbl_info *tbl, int index)
1337 {
1338         u16 rate_mask;
1339         s32 rate;
1340         s8 is_green = lq_sta->is_green;
1341         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1342         struct iwl_rxon_context *ctx = sta_priv->ctx;
1343
1344         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1345                 return -1;
1346
1347         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1348                 return -1;
1349
1350         /* Need both Tx chains/antennas to support MIMO */
1351         if (priv->hw_params.tx_chains_num < 3)
1352                 return -1;
1353
1354         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1355
1356         tbl->lq_type = LQ_MIMO3;
1357         tbl->is_dup = lq_sta->is_dup;
1358         tbl->action = 0;
1359         tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1360         rate_mask = lq_sta->active_mimo3_rate;
1361
1362         if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1363                 tbl->is_ht40 = 1;
1364         else
1365                 tbl->is_ht40 = 0;
1366
1367         rs_set_expected_tpt_table(lq_sta, tbl);
1368
1369         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1370
1371         IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1372                 rate, rate_mask);
1373         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1374                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1375                                                 rate, rate_mask);
1376                 return -1;
1377         }
1378         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1379
1380         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1381                      tbl->current_rate, is_green);
1382         return 0;
1383 }
1384
1385 /*
1386  * Set up search table for SISO
1387  */
1388 static int rs_switch_to_siso(struct iwl_priv *priv,
1389                              struct iwl_lq_sta *lq_sta,
1390                              struct ieee80211_conf *conf,
1391                              struct ieee80211_sta *sta,
1392                              struct iwl_scale_tbl_info *tbl, int index)
1393 {
1394         u16 rate_mask;
1395         u8 is_green = lq_sta->is_green;
1396         s32 rate;
1397         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1398         struct iwl_rxon_context *ctx = sta_priv->ctx;
1399
1400         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1401                 return -1;
1402
1403         IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1404
1405         tbl->is_dup = lq_sta->is_dup;
1406         tbl->lq_type = LQ_SISO;
1407         tbl->action = 0;
1408         tbl->max_search = IWL_MAX_SEARCH;
1409         rate_mask = lq_sta->active_siso_rate;
1410
1411         if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1412                 tbl->is_ht40 = 1;
1413         else
1414                 tbl->is_ht40 = 0;
1415
1416         if (is_green)
1417                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1418
1419         rs_set_expected_tpt_table(lq_sta, tbl);
1420         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1421
1422         IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1423         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1424                 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1425                              rate, rate_mask);
1426                 return -1;
1427         }
1428         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1429         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1430                      tbl->current_rate, is_green);
1431         return 0;
1432 }
1433
1434 /*
1435  * Try to switch to new modulation mode from legacy
1436  */
1437 static int rs_move_legacy_other(struct iwl_priv *priv,
1438                                 struct iwl_lq_sta *lq_sta,
1439                                 struct ieee80211_conf *conf,
1440                                 struct ieee80211_sta *sta,
1441                                 int index)
1442 {
1443         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1444         struct iwl_scale_tbl_info *search_tbl =
1445                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1446         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1447         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1448                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1449         u8 start_action;
1450         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1451         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1452         int ret = 0;
1453         u8 update_search_tbl_counter = 0;
1454
1455         switch (priv->bt_traffic_load) {
1456         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1457                 /* nothing */
1458                 break;
1459         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1460                 /* avoid antenna B unless MIMO */
1461                 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1462                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1463                 break;
1464         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1465         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1466                 /* avoid antenna B and MIMO */
1467                 valid_tx_ant =
1468                         first_antenna(priv->nvm_data->valid_tx_ant);
1469                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1470                     tbl->action != IWL_LEGACY_SWITCH_SISO)
1471                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1472                 break;
1473         default:
1474                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1475                 break;
1476         }
1477
1478         if (!iwl_ht_enabled(priv))
1479                 /* stay in Legacy */
1480                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1481         else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1482                    tbl->action > IWL_LEGACY_SWITCH_SISO)
1483                 tbl->action = IWL_LEGACY_SWITCH_SISO;
1484
1485         /* configure as 1x1 if bt full concurrency */
1486         if (priv->bt_full_concurrent) {
1487                 if (!iwl_ht_enabled(priv))
1488                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1489                 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1490                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1491                 valid_tx_ant =
1492                         first_antenna(priv->nvm_data->valid_tx_ant);
1493         }
1494
1495         start_action = tbl->action;
1496         for (; ;) {
1497                 lq_sta->action_counter++;
1498                 switch (tbl->action) {
1499                 case IWL_LEGACY_SWITCH_ANTENNA1:
1500                 case IWL_LEGACY_SWITCH_ANTENNA2:
1501                         IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1502
1503                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1504                                                         tx_chains_num <= 1) ||
1505                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1506                                                         tx_chains_num <= 2))
1507                                 break;
1508
1509                         /* Don't change antenna if success has been great */
1510                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1511                             !priv->bt_full_concurrent &&
1512                             priv->bt_traffic_load ==
1513                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1514                                 break;
1515
1516                         /* Set up search table to try other antenna */
1517                         memcpy(search_tbl, tbl, sz);
1518
1519                         if (rs_toggle_antenna(valid_tx_ant,
1520                                 &search_tbl->current_rate, search_tbl)) {
1521                                 update_search_tbl_counter = 1;
1522                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1523                                 goto out;
1524                         }
1525                         break;
1526                 case IWL_LEGACY_SWITCH_SISO:
1527                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1528
1529                         /* Set up search table to try SISO */
1530                         memcpy(search_tbl, tbl, sz);
1531                         search_tbl->is_SGI = 0;
1532                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1533                                                  search_tbl, index);
1534                         if (!ret) {
1535                                 lq_sta->action_counter = 0;
1536                                 goto out;
1537                         }
1538
1539                         break;
1540                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1541                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1542                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1543                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1544
1545                         /* Set up search table to try MIMO */
1546                         memcpy(search_tbl, tbl, sz);
1547                         search_tbl->is_SGI = 0;
1548
1549                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1550                                 search_tbl->ant_type = ANT_AB;
1551                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1552                                 search_tbl->ant_type = ANT_AC;
1553                         else
1554                                 search_tbl->ant_type = ANT_BC;
1555
1556                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1557                                 break;
1558
1559                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1560                                                  search_tbl, index);
1561                         if (!ret) {
1562                                 lq_sta->action_counter = 0;
1563                                 goto out;
1564                         }
1565                         break;
1566
1567                 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1568                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1569
1570                         /* Set up search table to try MIMO3 */
1571                         memcpy(search_tbl, tbl, sz);
1572                         search_tbl->is_SGI = 0;
1573
1574                         search_tbl->ant_type = ANT_ABC;
1575
1576                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1577                                 break;
1578
1579                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1580                                                  search_tbl, index);
1581                         if (!ret) {
1582                                 lq_sta->action_counter = 0;
1583                                 goto out;
1584                         }
1585                         break;
1586                 }
1587                 tbl->action++;
1588                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1589                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1590
1591                 if (tbl->action == start_action)
1592                         break;
1593
1594         }
1595         search_tbl->lq_type = LQ_NONE;
1596         return 0;
1597
1598 out:
1599         lq_sta->search_better_tbl = 1;
1600         tbl->action++;
1601         if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1602                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1603         if (update_search_tbl_counter)
1604                 search_tbl->action = tbl->action;
1605         return 0;
1606
1607 }
1608
1609 /*
1610  * Try to switch to new modulation mode from SISO
1611  */
1612 static int rs_move_siso_to_other(struct iwl_priv *priv,
1613                                  struct iwl_lq_sta *lq_sta,
1614                                  struct ieee80211_conf *conf,
1615                                  struct ieee80211_sta *sta, int index)
1616 {
1617         u8 is_green = lq_sta->is_green;
1618         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1619         struct iwl_scale_tbl_info *search_tbl =
1620                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1621         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1622         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1623         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1624                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1625         u8 start_action;
1626         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1627         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1628         u8 update_search_tbl_counter = 0;
1629         int ret;
1630
1631         switch (priv->bt_traffic_load) {
1632         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1633                 /* nothing */
1634                 break;
1635         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1636                 /* avoid antenna B unless MIMO */
1637                 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1638                         tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1639                 break;
1640         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1641         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1642                 /* avoid antenna B and MIMO */
1643                 valid_tx_ant =
1644                         first_antenna(priv->nvm_data->valid_tx_ant);
1645                 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1646                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1647                 break;
1648         default:
1649                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1650                 break;
1651         }
1652
1653         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1654             tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1655                 /* stay in SISO */
1656                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1657         }
1658
1659         /* configure as 1x1 if bt full concurrency */
1660         if (priv->bt_full_concurrent) {
1661                 valid_tx_ant =
1662                         first_antenna(priv->nvm_data->valid_tx_ant);
1663                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1664                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1665         }
1666
1667         start_action = tbl->action;
1668         for (;;) {
1669                 lq_sta->action_counter++;
1670                 switch (tbl->action) {
1671                 case IWL_SISO_SWITCH_ANTENNA1:
1672                 case IWL_SISO_SWITCH_ANTENNA2:
1673                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1674                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1675                                                 tx_chains_num <= 1) ||
1676                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1677                                                 tx_chains_num <= 2))
1678                                 break;
1679
1680                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1681                             !priv->bt_full_concurrent &&
1682                             priv->bt_traffic_load ==
1683                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1684                                 break;
1685
1686                         memcpy(search_tbl, tbl, sz);
1687                         if (rs_toggle_antenna(valid_tx_ant,
1688                                        &search_tbl->current_rate, search_tbl)) {
1689                                 update_search_tbl_counter = 1;
1690                                 goto out;
1691                         }
1692                         break;
1693                 case IWL_SISO_SWITCH_MIMO2_AB:
1694                 case IWL_SISO_SWITCH_MIMO2_AC:
1695                 case IWL_SISO_SWITCH_MIMO2_BC:
1696                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1697                         memcpy(search_tbl, tbl, sz);
1698                         search_tbl->is_SGI = 0;
1699
1700                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1701                                 search_tbl->ant_type = ANT_AB;
1702                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1703                                 search_tbl->ant_type = ANT_AC;
1704                         else
1705                                 search_tbl->ant_type = ANT_BC;
1706
1707                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1708                                 break;
1709
1710                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1711                                                  search_tbl, index);
1712                         if (!ret)
1713                                 goto out;
1714                         break;
1715                 case IWL_SISO_SWITCH_GI:
1716                         if (!tbl->is_ht40 && !(ht_cap->cap &
1717                                                 IEEE80211_HT_CAP_SGI_20))
1718                                 break;
1719                         if (tbl->is_ht40 && !(ht_cap->cap &
1720                                                 IEEE80211_HT_CAP_SGI_40))
1721                                 break;
1722
1723                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1724
1725                         memcpy(search_tbl, tbl, sz);
1726                         if (is_green) {
1727                                 if (!tbl->is_SGI)
1728                                         break;
1729                                 else
1730                                         IWL_ERR(priv,
1731                                                 "SGI was set in GF+SISO\n");
1732                         }
1733                         search_tbl->is_SGI = !tbl->is_SGI;
1734                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1735                         if (tbl->is_SGI) {
1736                                 s32 tpt = lq_sta->last_tpt / 100;
1737                                 if (tpt >= search_tbl->expected_tpt[index])
1738                                         break;
1739                         }
1740                         search_tbl->current_rate =
1741                                 rate_n_flags_from_tbl(priv, search_tbl,
1742                                                       index, is_green);
1743                         update_search_tbl_counter = 1;
1744                         goto out;
1745                 case IWL_SISO_SWITCH_MIMO3_ABC:
1746                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1747                         memcpy(search_tbl, tbl, sz);
1748                         search_tbl->is_SGI = 0;
1749                         search_tbl->ant_type = ANT_ABC;
1750
1751                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1752                                 break;
1753
1754                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1755                                                  search_tbl, index);
1756                         if (!ret)
1757                                 goto out;
1758                         break;
1759                 }
1760                 tbl->action++;
1761                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1762                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1763
1764                 if (tbl->action == start_action)
1765                         break;
1766         }
1767         search_tbl->lq_type = LQ_NONE;
1768         return 0;
1769
1770  out:
1771         lq_sta->search_better_tbl = 1;
1772         tbl->action++;
1773         if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1774                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1775         if (update_search_tbl_counter)
1776                 search_tbl->action = tbl->action;
1777
1778         return 0;
1779 }
1780
1781 /*
1782  * Try to switch to new modulation mode from MIMO2
1783  */
1784 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1785                                  struct iwl_lq_sta *lq_sta,
1786                                  struct ieee80211_conf *conf,
1787                                  struct ieee80211_sta *sta, int index)
1788 {
1789         s8 is_green = lq_sta->is_green;
1790         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1791         struct iwl_scale_tbl_info *search_tbl =
1792                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1793         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1794         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1795         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1796                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1797         u8 start_action;
1798         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1799         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1800         u8 update_search_tbl_counter = 0;
1801         int ret;
1802
1803         switch (priv->bt_traffic_load) {
1804         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1805                 /* nothing */
1806                 break;
1807         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1808         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1809                 /* avoid antenna B and MIMO */
1810                 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1811                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1812                 break;
1813         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1814                 /* avoid antenna B unless MIMO */
1815                 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1816                     tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1817                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1818                 break;
1819         default:
1820                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1821                 break;
1822         }
1823
1824         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1825             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1826              tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1827                 /* switch in SISO */
1828                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1829         }
1830
1831         /* configure as 1x1 if bt full concurrency */
1832         if (priv->bt_full_concurrent &&
1833             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1834              tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1835                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1836
1837         start_action = tbl->action;
1838         for (;;) {
1839                 lq_sta->action_counter++;
1840                 switch (tbl->action) {
1841                 case IWL_MIMO2_SWITCH_ANTENNA1:
1842                 case IWL_MIMO2_SWITCH_ANTENNA2:
1843                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1844
1845                         if (tx_chains_num <= 2)
1846                                 break;
1847
1848                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1849                                 break;
1850
1851                         memcpy(search_tbl, tbl, sz);
1852                         if (rs_toggle_antenna(valid_tx_ant,
1853                                        &search_tbl->current_rate, search_tbl)) {
1854                                 update_search_tbl_counter = 1;
1855                                 goto out;
1856                         }
1857                         break;
1858                 case IWL_MIMO2_SWITCH_SISO_A:
1859                 case IWL_MIMO2_SWITCH_SISO_B:
1860                 case IWL_MIMO2_SWITCH_SISO_C:
1861                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1862
1863                         /* Set up new search table for SISO */
1864                         memcpy(search_tbl, tbl, sz);
1865
1866                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1867                                 search_tbl->ant_type = ANT_A;
1868                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1869                                 search_tbl->ant_type = ANT_B;
1870                         else
1871                                 search_tbl->ant_type = ANT_C;
1872
1873                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1874                                 break;
1875
1876                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1877                                                  search_tbl, index);
1878                         if (!ret)
1879                                 goto out;
1880
1881                         break;
1882
1883                 case IWL_MIMO2_SWITCH_GI:
1884                         if (!tbl->is_ht40 && !(ht_cap->cap &
1885                                                 IEEE80211_HT_CAP_SGI_20))
1886                                 break;
1887                         if (tbl->is_ht40 && !(ht_cap->cap &
1888                                                 IEEE80211_HT_CAP_SGI_40))
1889                                 break;
1890
1891                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1892
1893                         /* Set up new search table for MIMO2 */
1894                         memcpy(search_tbl, tbl, sz);
1895                         search_tbl->is_SGI = !tbl->is_SGI;
1896                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1897                         /*
1898                          * If active table already uses the fastest possible
1899                          * modulation (dual stream with short guard interval),
1900                          * and it's working well, there's no need to look
1901                          * for a better type of modulation!
1902                          */
1903                         if (tbl->is_SGI) {
1904                                 s32 tpt = lq_sta->last_tpt / 100;
1905                                 if (tpt >= search_tbl->expected_tpt[index])
1906                                         break;
1907                         }
1908                         search_tbl->current_rate =
1909                                 rate_n_flags_from_tbl(priv, search_tbl,
1910                                                       index, is_green);
1911                         update_search_tbl_counter = 1;
1912                         goto out;
1913
1914                 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1915                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1916                         memcpy(search_tbl, tbl, sz);
1917                         search_tbl->is_SGI = 0;
1918                         search_tbl->ant_type = ANT_ABC;
1919
1920                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1921                                 break;
1922
1923                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1924                                                  search_tbl, index);
1925                         if (!ret)
1926                                 goto out;
1927
1928                         break;
1929                 }
1930                 tbl->action++;
1931                 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1932                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1933
1934                 if (tbl->action == start_action)
1935                         break;
1936         }
1937         search_tbl->lq_type = LQ_NONE;
1938         return 0;
1939  out:
1940         lq_sta->search_better_tbl = 1;
1941         tbl->action++;
1942         if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1943                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1944         if (update_search_tbl_counter)
1945                 search_tbl->action = tbl->action;
1946
1947         return 0;
1948
1949 }
1950
1951 /*
1952  * Try to switch to new modulation mode from MIMO3
1953  */
1954 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1955                                  struct iwl_lq_sta *lq_sta,
1956                                  struct ieee80211_conf *conf,
1957                                  struct ieee80211_sta *sta, int index)
1958 {
1959         s8 is_green = lq_sta->is_green;
1960         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1961         struct iwl_scale_tbl_info *search_tbl =
1962                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1963         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1964         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1965         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1966                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1967         u8 start_action;
1968         u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1969         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1970         int ret;
1971         u8 update_search_tbl_counter = 0;
1972
1973         switch (priv->bt_traffic_load) {
1974         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1975                 /* nothing */
1976                 break;
1977         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1978         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1979                 /* avoid antenna B and MIMO */
1980                 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1981                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1982                 break;
1983         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1984                 /* avoid antenna B unless MIMO */
1985                 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1986                     tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1987                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1988                 break;
1989         default:
1990                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1991                 break;
1992         }
1993
1994         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1995             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1996              tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1997                 /* switch in SISO */
1998                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1999         }
2000
2001         /* configure as 1x1 if bt full concurrency */
2002         if (priv->bt_full_concurrent &&
2003             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
2004              tbl->action > IWL_MIMO3_SWITCH_SISO_C))
2005                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
2006
2007         start_action = tbl->action;
2008         for (;;) {
2009                 lq_sta->action_counter++;
2010                 switch (tbl->action) {
2011                 case IWL_MIMO3_SWITCH_ANTENNA1:
2012                 case IWL_MIMO3_SWITCH_ANTENNA2:
2013                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
2014
2015                         if (tx_chains_num <= 3)
2016                                 break;
2017
2018                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2019                                 break;
2020
2021                         memcpy(search_tbl, tbl, sz);
2022                         if (rs_toggle_antenna(valid_tx_ant,
2023                                        &search_tbl->current_rate, search_tbl))
2024                                 goto out;
2025                         break;
2026                 case IWL_MIMO3_SWITCH_SISO_A:
2027                 case IWL_MIMO3_SWITCH_SISO_B:
2028                 case IWL_MIMO3_SWITCH_SISO_C:
2029                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2030
2031                         /* Set up new search table for SISO */
2032                         memcpy(search_tbl, tbl, sz);
2033
2034                         if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2035                                 search_tbl->ant_type = ANT_A;
2036                         else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2037                                 search_tbl->ant_type = ANT_B;
2038                         else
2039                                 search_tbl->ant_type = ANT_C;
2040
2041                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2042                                 break;
2043
2044                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2045                                                  search_tbl, index);
2046                         if (!ret)
2047                                 goto out;
2048
2049                         break;
2050
2051                 case IWL_MIMO3_SWITCH_MIMO2_AB:
2052                 case IWL_MIMO3_SWITCH_MIMO2_AC:
2053                 case IWL_MIMO3_SWITCH_MIMO2_BC:
2054                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2055
2056                         memcpy(search_tbl, tbl, sz);
2057                         search_tbl->is_SGI = 0;
2058                         if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2059                                 search_tbl->ant_type = ANT_AB;
2060                         else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2061                                 search_tbl->ant_type = ANT_AC;
2062                         else
2063                                 search_tbl->ant_type = ANT_BC;
2064
2065                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2066                                 break;
2067
2068                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2069                                                  search_tbl, index);
2070                         if (!ret)
2071                                 goto out;
2072
2073                         break;
2074
2075                 case IWL_MIMO3_SWITCH_GI:
2076                         if (!tbl->is_ht40 && !(ht_cap->cap &
2077                                                 IEEE80211_HT_CAP_SGI_20))
2078                                 break;
2079                         if (tbl->is_ht40 && !(ht_cap->cap &
2080                                                 IEEE80211_HT_CAP_SGI_40))
2081                                 break;
2082
2083                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2084
2085                         /* Set up new search table for MIMO */
2086                         memcpy(search_tbl, tbl, sz);
2087                         search_tbl->is_SGI = !tbl->is_SGI;
2088                         rs_set_expected_tpt_table(lq_sta, search_tbl);
2089                         /*
2090                          * If active table already uses the fastest possible
2091                          * modulation (dual stream with short guard interval),
2092                          * and it's working well, there's no need to look
2093                          * for a better type of modulation!
2094                          */
2095                         if (tbl->is_SGI) {
2096                                 s32 tpt = lq_sta->last_tpt / 100;
2097                                 if (tpt >= search_tbl->expected_tpt[index])
2098                                         break;
2099                         }
2100                         search_tbl->current_rate =
2101                                 rate_n_flags_from_tbl(priv, search_tbl,
2102                                                       index, is_green);
2103                         update_search_tbl_counter = 1;
2104                         goto out;
2105                 }
2106                 tbl->action++;
2107                 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2108                         tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2109
2110                 if (tbl->action == start_action)
2111                         break;
2112         }
2113         search_tbl->lq_type = LQ_NONE;
2114         return 0;
2115  out:
2116         lq_sta->search_better_tbl = 1;
2117         tbl->action++;
2118         if (tbl->action > IWL_MIMO3_SWITCH_GI)
2119                 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2120         if (update_search_tbl_counter)
2121                 search_tbl->action = tbl->action;
2122
2123         return 0;
2124
2125 }
2126
2127 /*
2128  * Check whether we should continue using same modulation mode, or
2129  * begin search for a new mode, based on:
2130  * 1) # tx successes or failures while using this mode
2131  * 2) # times calling this function
2132  * 3) elapsed time in this mode (not used, for now)
2133  */
2134 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2135 {
2136         struct iwl_scale_tbl_info *tbl;
2137         int i;
2138         int active_tbl;
2139         int flush_interval_passed = 0;
2140         struct iwl_priv *priv;
2141
2142         priv = lq_sta->drv;
2143         active_tbl = lq_sta->active_tbl;
2144
2145         tbl = &(lq_sta->lq_info[active_tbl]);
2146
2147         /* If we've been disallowing search, see if we should now allow it */
2148         if (lq_sta->stay_in_tbl) {
2149
2150                 /* Elapsed time using current modulation mode */
2151                 if (lq_sta->flush_timer)
2152                         flush_interval_passed =
2153                         time_after(jiffies,
2154                                         (unsigned long)(lq_sta->flush_timer +
2155                                         IWL_RATE_SCALE_FLUSH_INTVL));
2156
2157                 /*
2158                  * Check if we should allow search for new modulation mode.
2159                  * If many frames have failed or succeeded, or we've used
2160                  * this same modulation for a long time, allow search, and
2161                  * reset history stats that keep track of whether we should
2162                  * allow a new search.  Also (below) reset all bitmaps and
2163                  * stats in active history.
2164                  */
2165                 if (force_search ||
2166                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2167                     (lq_sta->total_success > lq_sta->max_success_limit) ||
2168                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2169                      && (flush_interval_passed))) {
2170                         IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n",
2171                                      lq_sta->total_failed,
2172                                      lq_sta->total_success,
2173                                      flush_interval_passed);
2174
2175                         /* Allow search for new mode */
2176                         lq_sta->stay_in_tbl = 0;        /* only place reset */
2177                         lq_sta->total_failed = 0;
2178                         lq_sta->total_success = 0;
2179                         lq_sta->flush_timer = 0;
2180
2181                 /*
2182                  * Else if we've used this modulation mode enough repetitions
2183                  * (regardless of elapsed time or success/failure), reset
2184                  * history bitmaps and rate-specific stats for all rates in
2185                  * active table.
2186                  */
2187                 } else {
2188                         lq_sta->table_count++;
2189                         if (lq_sta->table_count >=
2190                             lq_sta->table_count_limit) {
2191                                 lq_sta->table_count = 0;
2192
2193                                 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2194                                 for (i = 0; i < IWL_RATE_COUNT; i++)
2195                                         rs_rate_scale_clear_window(
2196                                                 &(tbl->win[i]));
2197                         }
2198                 }
2199
2200                 /* If transitioning to allow "search", reset all history
2201                  * bitmaps and stats in active table (this will become the new
2202                  * "search" table). */
2203                 if (!lq_sta->stay_in_tbl) {
2204                         for (i = 0; i < IWL_RATE_COUNT; i++)
2205                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2206                 }
2207         }
2208 }
2209
2210 /*
2211  * setup rate table in uCode
2212  */
2213 static void rs_update_rate_tbl(struct iwl_priv *priv,
2214                                struct iwl_rxon_context *ctx,
2215                                struct iwl_lq_sta *lq_sta,
2216                                struct iwl_scale_tbl_info *tbl,
2217                                int index, u8 is_green)
2218 {
2219         u32 rate;
2220
2221         /* Update uCode's rate table. */
2222         rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2223         rs_fill_link_cmd(priv, lq_sta, rate);
2224         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2225 }
2226
2227 /*
2228  * Do rate scaling and search for new modulation mode.
2229  */
2230 static void rs_rate_scale_perform(struct iwl_priv *priv,
2231                                   struct sk_buff *skb,
2232                                   struct ieee80211_sta *sta,
2233                                   struct iwl_lq_sta *lq_sta)
2234 {
2235         struct ieee80211_hw *hw = priv->hw;
2236         struct ieee80211_conf *conf = &hw->conf;
2237         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2238         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2239         int low = IWL_RATE_INVALID;
2240         int high = IWL_RATE_INVALID;
2241         int index;
2242         int i;
2243         struct iwl_rate_scale_data *window = NULL;
2244         int current_tpt = IWL_INVALID_VALUE;
2245         int low_tpt = IWL_INVALID_VALUE;
2246         int high_tpt = IWL_INVALID_VALUE;
2247         u32 fail_count;
2248         s8 scale_action = 0;
2249         u16 rate_mask;
2250         u8 update_lq = 0;
2251         struct iwl_scale_tbl_info *tbl, *tbl1;
2252         u16 rate_scale_index_msk = 0;
2253         u8 is_green = 0;
2254         u8 active_tbl = 0;
2255         u8 done_search = 0;
2256         u16 high_low;
2257         s32 sr;
2258         u8 tid = IWL_MAX_TID_COUNT;
2259         struct iwl_tid_data *tid_data;
2260         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2261         struct iwl_rxon_context *ctx = sta_priv->ctx;
2262
2263         IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2264
2265         /* Send management frames and NO_ACK data using lowest rate. */
2266         /* TODO: this could probably be improved.. */
2267         if (!ieee80211_is_data(hdr->frame_control) ||
2268             info->flags & IEEE80211_TX_CTL_NO_ACK)
2269                 return;
2270
2271         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2272
2273         tid = rs_tl_add_packet(lq_sta, hdr);
2274         if ((tid != IWL_MAX_TID_COUNT) &&
2275             (lq_sta->tx_agg_tid_en & (1 << tid))) {
2276                 tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid];
2277                 if (tid_data->agg.state == IWL_AGG_OFF)
2278                         lq_sta->is_agg = 0;
2279                 else
2280                         lq_sta->is_agg = 1;
2281         } else
2282                 lq_sta->is_agg = 0;
2283
2284         /*
2285          * Select rate-scale / modulation-mode table to work with in
2286          * the rest of this function:  "search" if searching for better
2287          * modulation mode, or "active" if doing rate scaling within a mode.
2288          */
2289         if (!lq_sta->search_better_tbl)
2290                 active_tbl = lq_sta->active_tbl;
2291         else
2292                 active_tbl = 1 - lq_sta->active_tbl;
2293
2294         tbl = &(lq_sta->lq_info[active_tbl]);
2295         if (is_legacy(tbl->lq_type))
2296                 lq_sta->is_green = 0;
2297         else
2298                 lq_sta->is_green = rs_use_green(sta);
2299         is_green = lq_sta->is_green;
2300
2301         /* current tx rate */
2302         index = lq_sta->last_txrate_idx;
2303
2304         IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2305                        tbl->lq_type);
2306
2307         /* rates available for this association, and for modulation mode */
2308         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2309
2310         IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2311
2312         /* mask with station rate restriction */
2313         if (is_legacy(tbl->lq_type)) {
2314                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2315                         /* supp_rates has no CCK bits in A mode */
2316                         rate_scale_index_msk = (u16) (rate_mask &
2317                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2318                 else
2319                         rate_scale_index_msk = (u16) (rate_mask &
2320                                                       lq_sta->supp_rates);
2321
2322         } else
2323                 rate_scale_index_msk = rate_mask;
2324
2325         if (!rate_scale_index_msk)
2326                 rate_scale_index_msk = rate_mask;
2327
2328         if (!((1 << index) & rate_scale_index_msk)) {
2329                 IWL_ERR(priv, "Current Rate is not valid\n");
2330                 if (lq_sta->search_better_tbl) {
2331                         /* revert to active table if search table is not valid*/
2332                         tbl->lq_type = LQ_NONE;
2333                         lq_sta->search_better_tbl = 0;
2334                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2335                         /* get "active" rate info */
2336                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2337                         rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2338                                            index, is_green);
2339                 }
2340                 return;
2341         }
2342
2343         /* Get expected throughput table and history window for current rate */
2344         if (!tbl->expected_tpt) {
2345                 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2346                 return;
2347         }
2348
2349         /* force user max rate if set by user */
2350         if ((lq_sta->max_rate_idx != -1) &&
2351             (lq_sta->max_rate_idx < index)) {
2352                 index = lq_sta->max_rate_idx;
2353                 update_lq = 1;
2354                 window = &(tbl->win[index]);
2355                 goto lq_update;
2356         }
2357
2358         window = &(tbl->win[index]);
2359
2360         /*
2361          * If there is not enough history to calculate actual average
2362          * throughput, keep analyzing results of more tx frames, without
2363          * changing rate or mode (bypass most of the rest of this function).
2364          * Set up new rate table in uCode only if old rate is not supported
2365          * in current association (use new rate found above).
2366          */
2367         fail_count = window->counter - window->success_counter;
2368         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2369                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2370                 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2371                                "for index %d\n",
2372                                window->success_counter, window->counter, index);
2373
2374                 /* Can't calculate this yet; not enough history */
2375                 window->average_tpt = IWL_INVALID_VALUE;
2376
2377                 /* Should we stay with this modulation mode,
2378                  * or search for a new one? */
2379                 rs_stay_in_table(lq_sta, false);
2380
2381                 goto out;
2382         }
2383         /* Else we have enough samples; calculate estimate of
2384          * actual average throughput */
2385         if (window->average_tpt != ((window->success_ratio *
2386                         tbl->expected_tpt[index] + 64) / 128)) {
2387                 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2388                 window->average_tpt = ((window->success_ratio *
2389                                         tbl->expected_tpt[index] + 64) / 128);
2390         }
2391
2392         /* If we are searching for better modulation mode, check success. */
2393         if (lq_sta->search_better_tbl &&
2394             (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2395                 /* If good success, continue using the "search" mode;
2396                  * no need to send new link quality command, since we're
2397                  * continuing to use the setup that we've been trying. */
2398                 if (window->average_tpt > lq_sta->last_tpt) {
2399
2400                         IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2401                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2402                                         window->success_ratio,
2403                                         window->average_tpt,
2404                                         lq_sta->last_tpt);
2405
2406                         if (!is_legacy(tbl->lq_type))
2407                                 lq_sta->enable_counter = 1;
2408
2409                         /* Swap tables; "search" becomes "active" */
2410                         lq_sta->active_tbl = active_tbl;
2411                         current_tpt = window->average_tpt;
2412
2413                 /* Else poor success; go back to mode in "active" table */
2414                 } else {
2415
2416                         IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2417                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2418                                         window->success_ratio,
2419                                         window->average_tpt,
2420                                         lq_sta->last_tpt);
2421
2422                         /* Nullify "search" table */
2423                         tbl->lq_type = LQ_NONE;
2424
2425                         /* Revert to "active" table */
2426                         active_tbl = lq_sta->active_tbl;
2427                         tbl = &(lq_sta->lq_info[active_tbl]);
2428
2429                         /* Revert to "active" rate and throughput info */
2430                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2431                         current_tpt = lq_sta->last_tpt;
2432
2433                         /* Need to set up a new rate table in uCode */
2434                         update_lq = 1;
2435                 }
2436
2437                 /* Either way, we've made a decision; modulation mode
2438                  * search is done, allow rate adjustment next time. */
2439                 lq_sta->search_better_tbl = 0;
2440                 done_search = 1;        /* Don't switch modes below! */
2441                 goto lq_update;
2442         }
2443
2444         /* (Else) not in search of better modulation mode, try for better
2445          * starting rate, while staying in this mode. */
2446         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2447                                         tbl->lq_type);
2448         low = high_low & 0xff;
2449         high = (high_low >> 8) & 0xff;
2450
2451         /* If user set max rate, dont allow higher than user constrain */
2452         if ((lq_sta->max_rate_idx != -1) &&
2453             (lq_sta->max_rate_idx < high))
2454                 high = IWL_RATE_INVALID;
2455
2456         sr = window->success_ratio;
2457
2458         /* Collect measured throughputs for current and adjacent rates */
2459         current_tpt = window->average_tpt;
2460         if (low != IWL_RATE_INVALID)
2461                 low_tpt = tbl->win[low].average_tpt;
2462         if (high != IWL_RATE_INVALID)
2463                 high_tpt = tbl->win[high].average_tpt;
2464
2465         scale_action = 0;
2466
2467         /* Too many failures, decrease rate */
2468         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2469                 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2470                 scale_action = -1;
2471
2472         /* No throughput measured yet for adjacent rates; try increase. */
2473         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2474                    (high_tpt == IWL_INVALID_VALUE)) {
2475
2476                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2477                         scale_action = 1;
2478                 else if (low != IWL_RATE_INVALID)
2479                         scale_action = 0;
2480         }
2481
2482         /* Both adjacent throughputs are measured, but neither one has better
2483          * throughput; we're using the best rate, don't change it! */
2484         else if ((low_tpt != IWL_INVALID_VALUE) &&
2485                  (high_tpt != IWL_INVALID_VALUE) &&
2486                  (low_tpt < current_tpt) &&
2487                  (high_tpt < current_tpt))
2488                 scale_action = 0;
2489
2490         /* At least one adjacent rate's throughput is measured,
2491          * and may have better performance. */
2492         else {
2493                 /* Higher adjacent rate's throughput is measured */
2494                 if (high_tpt != IWL_INVALID_VALUE) {
2495                         /* Higher rate has better throughput */
2496                         if (high_tpt > current_tpt &&
2497                                         sr >= IWL_RATE_INCREASE_TH) {
2498                                 scale_action = 1;
2499                         } else {
2500                                 scale_action = 0;
2501                         }
2502
2503                 /* Lower adjacent rate's throughput is measured */
2504                 } else if (low_tpt != IWL_INVALID_VALUE) {
2505                         /* Lower rate has better throughput */
2506                         if (low_tpt > current_tpt) {
2507                                 IWL_DEBUG_RATE(priv,
2508                                     "decrease rate because of low tpt\n");
2509                                 scale_action = -1;
2510                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2511                                 scale_action = 1;
2512                         }
2513                 }
2514         }
2515
2516         /* Sanity check; asked for decrease, but success rate or throughput
2517          * has been good at old rate.  Don't change it. */
2518         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2519                     ((sr > IWL_RATE_HIGH_TH) ||
2520                      (current_tpt > (100 * tbl->expected_tpt[low]))))
2521                 scale_action = 0;
2522         if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2523                 scale_action = -1;
2524         if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2525                 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2526                 scale_action = -1;
2527
2528         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2529              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2530                 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2531                         /*
2532                          * don't set scale_action, don't want to scale up if
2533                          * the rate scale doesn't otherwise think that is a
2534                          * good idea.
2535                          */
2536                 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2537                         scale_action = -1;
2538                 }
2539         }
2540         lq_sta->last_bt_traffic = priv->bt_traffic_load;
2541
2542         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2543              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2544                 /* search for a new modulation */
2545                 rs_stay_in_table(lq_sta, true);
2546                 goto lq_update;
2547         }
2548
2549         switch (scale_action) {
2550         case -1:
2551                 /* Decrease starting rate, update uCode's rate table */
2552                 if (low != IWL_RATE_INVALID) {
2553                         update_lq = 1;
2554                         index = low;
2555                 }
2556
2557                 break;
2558         case 1:
2559                 /* Increase starting rate, update uCode's rate table */
2560                 if (high != IWL_RATE_INVALID) {
2561                         update_lq = 1;
2562                         index = high;
2563                 }
2564
2565                 break;
2566         case 0:
2567                 /* No change */
2568         default:
2569                 break;
2570         }
2571
2572         IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2573                     "high %d type %d\n",
2574                      index, scale_action, low, high, tbl->lq_type);
2575
2576 lq_update:
2577         /* Replace uCode's rate table for the destination station. */
2578         if (update_lq)
2579                 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2580
2581         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2582                 /* Should we stay with this modulation mode,
2583                  * or search for a new one? */
2584           rs_stay_in_table(lq_sta, false);
2585         }
2586         /*
2587          * Search for new modulation mode if we're:
2588          * 1)  Not changing rates right now
2589          * 2)  Not just finishing up a search
2590          * 3)  Allowing a new search
2591          */
2592         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2593                 /* Save current throughput to compare with "search" throughput*/
2594                 lq_sta->last_tpt = current_tpt;
2595
2596                 /* Select a new "search" modulation mode to try.
2597                  * If one is found, set up the new "search" table. */
2598                 if (is_legacy(tbl->lq_type))
2599                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2600                 else if (is_siso(tbl->lq_type))
2601                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2602                 else if (is_mimo2(tbl->lq_type))
2603                         rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2604                 else
2605                         rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2606
2607                 /* If new "search" mode was selected, set up in uCode table */
2608                 if (lq_sta->search_better_tbl) {
2609                         /* Access the "search" table, clear its history. */
2610                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2611                         for (i = 0; i < IWL_RATE_COUNT; i++)
2612                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2613
2614                         /* Use new "search" start rate */
2615                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2616
2617                         IWL_DEBUG_RATE(priv, "Switch current  mcs: %X index: %d\n",
2618                                      tbl->current_rate, index);
2619                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2620                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2621                 } else
2622                         done_search = 1;
2623         }
2624
2625         if (done_search && !lq_sta->stay_in_tbl) {
2626                 /* If the "active" (non-search) mode was legacy,
2627                  * and we've tried switching antennas,
2628                  * but we haven't been able to try HT modes (not available),
2629                  * stay with best antenna legacy modulation for a while
2630                  * before next round of mode comparisons. */
2631                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2632                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2633                     lq_sta->action_counter > tbl1->max_search) {
2634                         IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2635                         rs_set_stay_in_table(priv, 1, lq_sta);
2636                 }
2637
2638                 /* If we're in an HT mode, and all 3 mode switch actions
2639                  * have been tried and compared, stay in this best modulation
2640                  * mode for a while before next round of mode comparisons. */
2641                 if (lq_sta->enable_counter &&
2642                     (lq_sta->action_counter >= tbl1->max_search) &&
2643                     iwl_ht_enabled(priv)) {
2644                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2645                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2646                             (tid != IWL_MAX_TID_COUNT)) {
2647                                 u8 sta_id = lq_sta->lq.sta_id;
2648                                 tid_data = &priv->tid_data[sta_id][tid];
2649                                 if (tid_data->agg.state == IWL_AGG_OFF) {
2650                                         IWL_DEBUG_RATE(priv,
2651                                                        "try to aggregate tid %d\n",
2652                                                        tid);
2653                                         rs_tl_turn_on_agg(priv, tid,
2654                                                           lq_sta, sta);
2655                                 }
2656                         }
2657                         rs_set_stay_in_table(priv, 0, lq_sta);
2658                 }
2659         }
2660
2661 out:
2662         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2663         lq_sta->last_txrate_idx = index;
2664 }
2665
2666 /**
2667  * rs_initialize_lq - Initialize a station's hardware rate table
2668  *
2669  * The uCode's station table contains a table of fallback rates
2670  * for automatic fallback during transmission.
2671  *
2672  * NOTE: This sets up a default set of values.  These will be replaced later
2673  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2674  *       rc80211_simple.
2675  *
2676  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2677  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2678  *       which requires station table entry to exist).
2679  */
2680 static void rs_initialize_lq(struct iwl_priv *priv,
2681                              struct ieee80211_sta *sta,
2682                              struct iwl_lq_sta *lq_sta)
2683 {
2684         struct iwl_scale_tbl_info *tbl;
2685         int rate_idx;
2686         int i;
2687         u32 rate;
2688         u8 use_green = rs_use_green(sta);
2689         u8 active_tbl = 0;
2690         u8 valid_tx_ant;
2691         struct iwl_station_priv *sta_priv;
2692         struct iwl_rxon_context *ctx;
2693
2694         if (!sta || !lq_sta)
2695                 return;
2696
2697         sta_priv = (void *)sta->drv_priv;
2698         ctx = sta_priv->ctx;
2699
2700         i = lq_sta->last_txrate_idx;
2701
2702         valid_tx_ant = priv->nvm_data->valid_tx_ant;
2703
2704         if (!lq_sta->search_better_tbl)
2705                 active_tbl = lq_sta->active_tbl;
2706         else
2707                 active_tbl = 1 - lq_sta->active_tbl;
2708
2709         tbl = &(lq_sta->lq_info[active_tbl]);
2710
2711         if ((i < 0) || (i >= IWL_RATE_COUNT))
2712                 i = 0;
2713
2714         rate = iwl_rates[i].plcp;
2715         tbl->ant_type = first_antenna(valid_tx_ant);
2716         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2717
2718         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2719                 rate |= RATE_MCS_CCK_MSK;
2720
2721         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2722         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2723             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2724
2725         rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2726         tbl->current_rate = rate;
2727         rs_set_expected_tpt_table(lq_sta, tbl);
2728         rs_fill_link_cmd(NULL, lq_sta, rate);
2729         priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2730         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2731 }
2732
2733 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2734                         struct ieee80211_tx_rate_control *txrc)
2735 {
2736
2737         struct sk_buff *skb = txrc->skb;
2738         struct ieee80211_supported_band *sband = txrc->sband;
2739         struct iwl_op_mode *op_mode __maybe_unused =
2740                         (struct iwl_op_mode *)priv_r;
2741         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2742         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2743         struct iwl_lq_sta *lq_sta = priv_sta;
2744         int rate_idx;
2745
2746         IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2747
2748         /* Get max rate if user set max rate */
2749         if (lq_sta) {
2750                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2751                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2752                     (lq_sta->max_rate_idx != -1))
2753                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2754                 if ((lq_sta->max_rate_idx < 0) ||
2755                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2756                         lq_sta->max_rate_idx = -1;
2757         }
2758
2759         /* Treat uninitialized rate scaling data same as non-existing. */
2760         if (lq_sta && !lq_sta->drv) {
2761                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2762                 priv_sta = NULL;
2763         }
2764
2765         /* Send management frames and NO_ACK data using lowest rate. */
2766         if (rate_control_send_low(sta, priv_sta, txrc))
2767                 return;
2768
2769         rate_idx  = lq_sta->last_txrate_idx;
2770
2771         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2772                 rate_idx -= IWL_FIRST_OFDM_RATE;
2773                 /* 6M and 9M shared same MCS index */
2774                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2775                 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2776                     IWL_RATE_MIMO3_6M_PLCP)
2777                         rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2778                 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2779                          IWL_RATE_MIMO2_6M_PLCP)
2780                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2781                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2782                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2783                         info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2784                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2785                         info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2786                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2787                         info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2788                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2789                         info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2790         } else {
2791                 /* Check for invalid rates */
2792                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2793                                 ((sband->band == IEEE80211_BAND_5GHZ) &&
2794                                  (rate_idx < IWL_FIRST_OFDM_RATE)))
2795                         rate_idx = rate_lowest_index(sband, sta);
2796                 /* On valid 5 GHz rate, adjust index */
2797                 else if (sband->band == IEEE80211_BAND_5GHZ)
2798                         rate_idx -= IWL_FIRST_OFDM_RATE;
2799                 info->control.rates[0].flags = 0;
2800         }
2801         info->control.rates[0].idx = rate_idx;
2802
2803 }
2804
2805 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2806                           gfp_t gfp)
2807 {
2808         struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2809         struct iwl_op_mode *op_mode __maybe_unused =
2810                         (struct iwl_op_mode *)priv_rate;
2811         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2812
2813         IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2814
2815         return &sta_priv->lq_sta;
2816 }
2817
2818 /*
2819  * Called after adding a new station to initialize rate scaling
2820  */
2821 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2822 {
2823         int i, j;
2824         struct ieee80211_hw *hw = priv->hw;
2825         struct ieee80211_conf *conf = &priv->hw->conf;
2826         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2827         struct iwl_station_priv *sta_priv;
2828         struct iwl_lq_sta *lq_sta;
2829         struct ieee80211_supported_band *sband;
2830         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2831
2832         sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2833         lq_sta = &sta_priv->lq_sta;
2834         sband = hw->wiphy->bands[conf->chandef.chan->band];
2835
2836
2837         lq_sta->lq.sta_id = sta_id;
2838
2839         for (j = 0; j < LQ_SIZE; j++)
2840                 for (i = 0; i < IWL_RATE_COUNT; i++)
2841                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2842
2843         lq_sta->flush_timer = 0;
2844         lq_sta->supp_rates = sta->supp_rates[sband->band];
2845         for (j = 0; j < LQ_SIZE; j++)
2846                 for (i = 0; i < IWL_RATE_COUNT; i++)
2847                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2848
2849         IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2850                        sta_id);
2851         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2852          * the lowest or the highest rate.. Could consider using RSSI from
2853          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2854          * after assoc.. */
2855
2856         lq_sta->is_dup = 0;
2857         lq_sta->max_rate_idx = -1;
2858         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2859         lq_sta->is_green = rs_use_green(sta);
2860         lq_sta->band = sband->band;
2861         /*
2862          * active legacy rates as per supported rates bitmap
2863          */
2864         supp = sta->supp_rates[sband->band];
2865         lq_sta->active_legacy_rate = 0;
2866         for_each_set_bit(i, &supp, BITS_PER_LONG)
2867                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2868
2869         /*
2870          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2871          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2872          */
2873         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2874         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2875         lq_sta->active_siso_rate &= ~((u16)0x2);
2876         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2877
2878         /* Same here */
2879         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2880         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2881         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2882         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2883
2884         lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2885         lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2886         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2887         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2888
2889         IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2890                      lq_sta->active_siso_rate,
2891                      lq_sta->active_mimo2_rate,
2892                      lq_sta->active_mimo3_rate);
2893
2894         /* These values will be overridden later */
2895         lq_sta->lq.general_params.single_stream_ant_msk =
2896                 first_antenna(priv->nvm_data->valid_tx_ant);
2897         lq_sta->lq.general_params.dual_stream_ant_msk =
2898                 priv->nvm_data->valid_tx_ant &
2899                 ~first_antenna(priv->nvm_data->valid_tx_ant);
2900         if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2901                 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2902         } else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) {
2903                 lq_sta->lq.general_params.dual_stream_ant_msk =
2904                         priv->nvm_data->valid_tx_ant;
2905         }
2906
2907         /* as default allow aggregation for all tids */
2908         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2909         lq_sta->drv = priv;
2910
2911         /* Set last_txrate_idx to lowest rate */
2912         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2913         if (sband->band == IEEE80211_BAND_5GHZ)
2914                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2915         lq_sta->is_agg = 0;
2916 #ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE
2917         priv->tm_fixed_rate = 0;
2918 #endif
2919 #ifdef CONFIG_MAC80211_DEBUGFS
2920         lq_sta->dbg_fixed_rate = 0;
2921 #endif
2922
2923         rs_initialize_lq(priv, sta, lq_sta);
2924 }
2925
2926 static void rs_fill_link_cmd(struct iwl_priv *priv,
2927                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2928 {
2929         struct iwl_scale_tbl_info tbl_type;
2930         int index = 0;
2931         int rate_idx;
2932         int repeat_rate = 0;
2933         u8 ant_toggle_cnt = 0;
2934         u8 use_ht_possible = 1;
2935         u8 valid_tx_ant = 0;
2936         struct iwl_station_priv *sta_priv =
2937                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2938         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2939
2940         /* Override starting rate (index 0) if needed for debug purposes */
2941         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2942
2943         /* Interpret new_rate (rate_n_flags) */
2944         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2945                                   &tbl_type, &rate_idx);
2946
2947         if (priv && priv->bt_full_concurrent) {
2948                 /* 1x1 only */
2949                 tbl_type.ant_type =
2950                         first_antenna(priv->nvm_data->valid_tx_ant);
2951         }
2952
2953         /* How many times should we repeat the initial rate? */
2954         if (is_legacy(tbl_type.lq_type)) {
2955                 ant_toggle_cnt = 1;
2956                 repeat_rate = IWL_NUMBER_TRY;
2957         } else {
2958                 repeat_rate = min(IWL_HT_NUMBER_TRY,
2959                                   LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2960         }
2961
2962         lq_cmd->general_params.mimo_delimiter =
2963                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2964
2965         /* Fill 1st table entry (index 0) */
2966         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2967
2968         if (num_of_ant(tbl_type.ant_type) == 1) {
2969                 lq_cmd->general_params.single_stream_ant_msk =
2970                                                 tbl_type.ant_type;
2971         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2972                 lq_cmd->general_params.dual_stream_ant_msk =
2973                                                 tbl_type.ant_type;
2974         } /* otherwise we don't modify the existing value */
2975
2976         index++;
2977         repeat_rate--;
2978         if (priv) {
2979                 if (priv->bt_full_concurrent)
2980                         valid_tx_ant = ANT_A;
2981                 else
2982                         valid_tx_ant = priv->nvm_data->valid_tx_ant;
2983         }
2984
2985         /* Fill rest of rate table */
2986         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2987                 /* Repeat initial/next rate.
2988                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2989                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2990                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2991                         if (is_legacy(tbl_type.lq_type)) {
2992                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2993                                         ant_toggle_cnt++;
2994                                 else if (priv &&
2995                                          rs_toggle_antenna(valid_tx_ant,
2996                                                         &new_rate, &tbl_type))
2997                                         ant_toggle_cnt = 1;
2998                         }
2999
3000                         /* Override next rate if needed for debug purposes */
3001                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3002
3003                         /* Fill next table entry */
3004                         lq_cmd->rs_table[index].rate_n_flags =
3005                                         cpu_to_le32(new_rate);
3006                         repeat_rate--;
3007                         index++;
3008                 }
3009
3010                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
3011                                                 &rate_idx);
3012
3013                 if (priv && priv->bt_full_concurrent) {
3014                         /* 1x1 only */
3015                         tbl_type.ant_type =
3016                             first_antenna(priv->nvm_data->valid_tx_ant);
3017                 }
3018
3019                 /* Indicate to uCode which entries might be MIMO.
3020                  * If initial rate was MIMO, this will finally end up
3021                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
3022                 if (is_mimo(tbl_type.lq_type))
3023                         lq_cmd->general_params.mimo_delimiter = index;
3024
3025                 /* Get next rate */
3026                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3027                                              use_ht_possible);
3028
3029                 /* How many times should we repeat the next rate? */
3030                 if (is_legacy(tbl_type.lq_type)) {
3031                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3032                                 ant_toggle_cnt++;
3033                         else if (priv &&
3034                                  rs_toggle_antenna(valid_tx_ant,
3035                                                    &new_rate, &tbl_type))
3036                                 ant_toggle_cnt = 1;
3037
3038                         repeat_rate = IWL_NUMBER_TRY;
3039                 } else {
3040                         repeat_rate = IWL_HT_NUMBER_TRY;
3041                 }
3042
3043                 /* Don't allow HT rates after next pass.
3044                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3045                 use_ht_possible = 0;
3046
3047                 /* Override next rate if needed for debug purposes */
3048                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3049
3050                 /* Fill next table entry */
3051                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3052
3053                 index++;
3054                 repeat_rate--;
3055         }
3056
3057         lq_cmd->agg_params.agg_frame_cnt_limit =
3058                 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3059         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3060
3061         lq_cmd->agg_params.agg_time_limit =
3062                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3063         /*
3064          * overwrite if needed, pass aggregation time limit
3065          * to uCode in uSec
3066          */
3067         if (priv && priv->cfg->bt_params &&
3068             priv->cfg->bt_params->agg_time_limit &&
3069             priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3070                 lq_cmd->agg_params.agg_time_limit =
3071                         cpu_to_le16(priv->cfg->bt_params->agg_time_limit);
3072 }
3073
3074 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3075 {
3076         return hw->priv;
3077 }
3078 /* rate scale requires free function to be implemented */
3079 static void rs_free(void *priv_rate)
3080 {
3081         return;
3082 }
3083
3084 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3085                         void *priv_sta)
3086 {
3087         struct iwl_op_mode *op_mode __maybe_unused = priv_r;
3088         struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
3089
3090         IWL_DEBUG_RATE(priv, "enter\n");
3091         IWL_DEBUG_RATE(priv, "leave\n");
3092 }
3093
3094 #ifdef CONFIG_MAC80211_DEBUGFS
3095 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3096                              u32 *rate_n_flags, int index)
3097 {
3098         struct iwl_priv *priv;
3099         u8 valid_tx_ant;
3100         u8 ant_sel_tx;
3101
3102         priv = lq_sta->drv;
3103         valid_tx_ant = priv->nvm_data->valid_tx_ant;
3104         if (lq_sta->dbg_fixed_rate) {
3105                 ant_sel_tx =
3106                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3107                   >> RATE_MCS_ANT_POS);
3108                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3109                         *rate_n_flags = lq_sta->dbg_fixed_rate;
3110                         IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3111                 } else {
3112                         lq_sta->dbg_fixed_rate = 0;
3113                         IWL_ERR(priv,
3114                             "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3115                             ant_sel_tx, valid_tx_ant);
3116                         IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3117                 }
3118         } else {
3119                 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3120         }
3121 }
3122
3123 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3124                         const char __user *user_buf, size_t count, loff_t *ppos)
3125 {
3126         struct iwl_lq_sta *lq_sta = file->private_data;
3127         struct iwl_priv *priv;
3128         char buf[64];
3129         size_t buf_size;
3130         u32 parsed_rate;
3131
3132
3133         priv = lq_sta->drv;
3134         memset(buf, 0, sizeof(buf));
3135         buf_size = min(count, sizeof(buf) -  1);
3136         if (copy_from_user(buf, user_buf, buf_size))
3137                 return -EFAULT;
3138
3139         if (sscanf(buf, "%x", &parsed_rate) == 1)
3140                 lq_sta->dbg_fixed_rate = parsed_rate;
3141         else
3142                 lq_sta->dbg_fixed_rate = 0;
3143
3144         rs_program_fix_rate(priv, lq_sta);
3145
3146         return count;
3147 }
3148
3149 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3150                         char __user *user_buf, size_t count, loff_t *ppos)
3151 {
3152         char *buff;
3153         int desc = 0;
3154         int i = 0;
3155         int index = 0;
3156         ssize_t ret;
3157
3158         struct iwl_lq_sta *lq_sta = file->private_data;
3159         struct iwl_priv *priv;
3160         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3161
3162         priv = lq_sta->drv;
3163         buff = kmalloc(1024, GFP_KERNEL);
3164         if (!buff)
3165                 return -ENOMEM;
3166
3167         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3168         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3169                         lq_sta->total_failed, lq_sta->total_success,
3170                         lq_sta->active_legacy_rate);
3171         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3172                         lq_sta->dbg_fixed_rate);
3173         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3174             (priv->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3175             (priv->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3176             (priv->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3177         desc += sprintf(buff+desc, "lq type %s\n",
3178            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3179         if (is_Ht(tbl->lq_type)) {
3180                 desc += sprintf(buff+desc, " %s",
3181                    (is_siso(tbl->lq_type)) ? "SISO" :
3182                    ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3183                    desc += sprintf(buff+desc, " %s",
3184                    (tbl->is_ht40) ? "40MHz" : "20MHz");
3185                    desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3186                    (lq_sta->is_green) ? "GF enabled" : "",
3187                    (lq_sta->is_agg) ? "AGG on" : "");
3188         }
3189         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3190                 lq_sta->last_rate_n_flags);
3191         desc += sprintf(buff+desc, "general:"
3192                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3193                 lq_sta->lq.general_params.flags,
3194                 lq_sta->lq.general_params.mimo_delimiter,
3195                 lq_sta->lq.general_params.single_stream_ant_msk,
3196                 lq_sta->lq.general_params.dual_stream_ant_msk);
3197
3198         desc += sprintf(buff+desc, "agg:"
3199                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3200                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3201                         lq_sta->lq.agg_params.agg_dis_start_th,
3202                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
3203
3204         desc += sprintf(buff+desc,
3205                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3206                         lq_sta->lq.general_params.start_rate_index[0],
3207                         lq_sta->lq.general_params.start_rate_index[1],
3208                         lq_sta->lq.general_params.start_rate_index[2],
3209                         lq_sta->lq.general_params.start_rate_index[3]);
3210
3211         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3212                 index = iwl_hwrate_to_plcp_idx(
3213                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3214                 if (is_legacy(tbl->lq_type)) {
3215                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3216                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3217                                 iwl_rate_mcs[index].mbps);
3218                 } else {
3219                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3220                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3221                                 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3222                 }
3223         }
3224
3225         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3226         kfree(buff);
3227         return ret;
3228 }
3229
3230 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3231         .write = rs_sta_dbgfs_scale_table_write,
3232         .read = rs_sta_dbgfs_scale_table_read,
3233         .open = simple_open,
3234         .llseek = default_llseek,
3235 };
3236 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3237                         char __user *user_buf, size_t count, loff_t *ppos)
3238 {
3239         char *buff;
3240         int desc = 0;
3241         int i, j;
3242         ssize_t ret;
3243
3244         struct iwl_lq_sta *lq_sta = file->private_data;
3245
3246         buff = kmalloc(1024, GFP_KERNEL);
3247         if (!buff)
3248                 return -ENOMEM;
3249
3250         for (i = 0; i < LQ_SIZE; i++) {
3251                 desc += sprintf(buff+desc,
3252                                 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3253                                 "rate=0x%X\n",
3254                                 lq_sta->active_tbl == i ? "*" : "x",
3255                                 lq_sta->lq_info[i].lq_type,
3256                                 lq_sta->lq_info[i].is_SGI,
3257                                 lq_sta->lq_info[i].is_ht40,
3258                                 lq_sta->lq_info[i].is_dup,
3259                                 lq_sta->is_green,
3260                                 lq_sta->lq_info[i].current_rate);
3261                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3262                         desc += sprintf(buff+desc,
3263                                 "counter=%d success=%d %%=%d\n",
3264                                 lq_sta->lq_info[i].win[j].counter,
3265                                 lq_sta->lq_info[i].win[j].success_counter,
3266                                 lq_sta->lq_info[i].win[j].success_ratio);
3267                 }
3268         }
3269         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3270         kfree(buff);
3271         return ret;
3272 }
3273
3274 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3275         .read = rs_sta_dbgfs_stats_table_read,
3276         .open = simple_open,
3277         .llseek = default_llseek,
3278 };
3279
3280 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3281                         char __user *user_buf, size_t count, loff_t *ppos)
3282 {
3283         struct iwl_lq_sta *lq_sta = file->private_data;
3284         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3285         char buff[120];
3286         int desc = 0;
3287
3288         if (is_Ht(tbl->lq_type))
3289                 desc += sprintf(buff+desc,
3290                                 "Bit Rate= %d Mb/s\n",
3291                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3292         else
3293                 desc += sprintf(buff+desc,
3294                                 "Bit Rate= %d Mb/s\n",
3295                                 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3296
3297         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3298 }
3299
3300 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3301         .read = rs_sta_dbgfs_rate_scale_data_read,
3302         .open = simple_open,
3303         .llseek = default_llseek,
3304 };
3305
3306 static void rs_add_debugfs(void *priv, void *priv_sta,
3307                                         struct dentry *dir)
3308 {
3309         struct iwl_lq_sta *lq_sta = priv_sta;
3310         lq_sta->rs_sta_dbgfs_scale_table_file =
3311                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3312                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3313         lq_sta->rs_sta_dbgfs_stats_table_file =
3314                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3315                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
3316         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3317                 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3318                         lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3319         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3320                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3321                 &lq_sta->tx_agg_tid_en);
3322
3323 }
3324
3325 static void rs_remove_debugfs(void *priv, void *priv_sta)
3326 {
3327         struct iwl_lq_sta *lq_sta = priv_sta;
3328         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3329         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3330         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3331         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3332 }
3333 #endif
3334
3335 /*
3336  * Initialization of rate scaling information is done by driver after
3337  * the station is added. Since mac80211 calls this function before a
3338  * station is added we ignore it.
3339  */
3340 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3341                          struct ieee80211_sta *sta, void *priv_sta)
3342 {
3343 }
3344 static struct rate_control_ops rs_ops = {
3345         .module = NULL,
3346         .name = RS_NAME,
3347         .tx_status = rs_tx_status,
3348         .get_rate = rs_get_rate,
3349         .rate_init = rs_rate_init_stub,
3350         .alloc = rs_alloc,
3351         .free = rs_free,
3352         .alloc_sta = rs_alloc_sta,
3353         .free_sta = rs_free_sta,
3354 #ifdef CONFIG_MAC80211_DEBUGFS
3355         .add_sta_debugfs = rs_add_debugfs,
3356         .remove_sta_debugfs = rs_remove_debugfs,
3357 #endif
3358 };
3359
3360 int iwlagn_rate_control_register(void)
3361 {
3362         return ieee80211_rate_control_register(&rs_ops);
3363 }
3364
3365 void iwlagn_rate_control_unregister(void)
3366 {
3367         ieee80211_rate_control_unregister(&rs_ops);
3368 }
3369