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

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