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 void 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;
 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                         ret = ieee80211_stop_tx_ba_session(sta, tid,
 317                                                 WLAN_BACK_INITIATOR);
 318                 }
 319         }
 320 }
 321
 322 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 323                               struct iwl_lq_sta *lq_data,
 324                               struct ieee80211_sta *sta)
 325 {
 326         if ((tid < TID_MAX_LOAD_COUNT))
 327                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 328         else if (tid == IWL_AGG_ALL_TID)
 329                 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
 330                         rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 331         if (priv->cfg->use_rts_for_ht) {
 332                 /*
 333                  * switch to RTS/CTS if it is the prefer protection method
 334                  * for HT traffic
 335                  */
 336                 IWL_DEBUG_HT(priv, "use RTS/CTS protection for HT\n");
 337                 priv->staging_rxon.flags &= ~RXON_FLG_SELF_CTS_EN;
 338                 iwlcore_commit_rxon(priv);
 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 (hdr && is_multicast_ether_addr(hdr->addr1) &&
 615             lq_sta->active_rate_basic)
 616                 return lq_sta->active_rate_basic;
 617
 618         if (is_legacy(rate_type)) {
 619                 return lq_sta->active_legacy_rate;
 620         } else {
 621                 if (is_siso(rate_type))
 622                         return lq_sta->active_siso_rate;
 623                 else if (is_mimo2(rate_type))
 624                         return lq_sta->active_mimo2_rate;
 625                 else
 626                         return lq_sta->active_mimo3_rate;
 627         }
 628 }
 629
 630 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 631                                 int rate_type)
 632 {
 633         u8 high = IWL_RATE_INVALID;
 634         u8 low = IWL_RATE_INVALID;
 635
 636         /* 802.11A or ht walks to the next literal adjacent rate in
 637          * the rate table */
 638         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 639                 int i;
 640                 u32 mask;
 641
 642                 /* Find the previous rate that is in the rate mask */
 643                 i = index - 1;
 644                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 645                         if (rate_mask & mask) {
 646                                 low = i;
 647                                 break;
 648                         }
 649                 }
 650
 651                 /* Find the next rate that is in the rate mask */
 652                 i = index + 1;
 653                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 654                         if (rate_mask & mask) {
 655                                 high = i;
 656                                 break;
 657                         }
 658                 }
 659
 660                 return (high << 8) | low;
 661         }
 662
 663         low = index;
 664         while (low != IWL_RATE_INVALID) {
 665                 low = iwl_rates[low].prev_rs;
 666                 if (low == IWL_RATE_INVALID)
 667                         break;
 668                 if (rate_mask & (1 << low))
 669                         break;
 670                 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
 671         }
 672
 673         high = index;
 674         while (high != IWL_RATE_INVALID) {
 675                 high = iwl_rates[high].next_rs;
 676                 if (high == IWL_RATE_INVALID)
 677                         break;
 678                 if (rate_mask & (1 << high))
 679                         break;
 680                 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
 681         }
 682
 683         return (high << 8) | low;
 684 }
 685
 686 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 687                              struct iwl_scale_tbl_info *tbl,
 688                              u8 scale_index, u8 ht_possible)
 689 {
 690         s32 low;
 691         u16 rate_mask;
 692         u16 high_low;
 693         u8 switch_to_legacy = 0;
 694         u8 is_green = lq_sta->is_green;
 695         struct iwl_priv *priv = lq_sta->drv;
 696
 697         /* check if we need to switch from HT to legacy rates.
 698          * assumption is that mandatory rates (1Mbps or 6Mbps)
 699          * are always supported (spec demand) */
 700         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 701                 switch_to_legacy = 1;
 702                 scale_index = rs_ht_to_legacy[scale_index];
 703                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 704                         tbl->lq_type = LQ_A;
 705                 else
 706                         tbl->lq_type = LQ_G;
 707
 708                 if (num_of_ant(tbl->ant_type) > 1)
 709                         tbl->ant_type =
 710                                 first_antenna(priv->hw_params.valid_tx_ant);
 711
 712                 tbl->is_ht40 = 0;
 713                 tbl->is_SGI = 0;
 714                 tbl->max_search = IWL_MAX_SEARCH;
 715         }
 716
 717         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 718
 719         /* Mask with station rate restriction */
 720         if (is_legacy(tbl->lq_type)) {
 721                 /* supp_rates has no CCK bits in A mode */
 722                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 723                         rate_mask  = (u16)(rate_mask &
 724                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 725                 else
 726                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 727         }
 728
 729         /* If we switched from HT to legacy, check current rate */
 730         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 731                 low = scale_index;
 732                 goto out;
 733         }
 734
 735         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 736                                         tbl->lq_type);
 737         low = high_low & 0xff;
 738
 739         if (low == IWL_RATE_INVALID)
 740                 low = scale_index;
 741
 742 out:
 743         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 744 }
 745
 746 /*
 747  * Simple function to compare two rate scale table types
 748  */
 749 static bool table_type_matches(struct iwl_scale_tbl_info *a,
 750                                struct iwl_scale_tbl_info *b)
 751 {
 752         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 753                 (a->is_SGI == b->is_SGI);
 754 }
 755
 756 /*
 757  * mac80211 sends us Tx status
 758  */
 759 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 760                          struct ieee80211_sta *sta, void *priv_sta,
 761                          struct sk_buff *skb)
 762 {
 763         int legacy_success;
 764         int retries;
 765         int rs_index, mac_index, i;
 766         struct iwl_lq_sta *lq_sta = priv_sta;
 767         struct iwl_link_quality_cmd *table;
 768         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 769         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
 770         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 771         enum mac80211_rate_control_flags mac_flags;
 772         u32 tx_rate;
 773         struct iwl_scale_tbl_info tbl_type;
 774         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 775
 776         IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
 777
 778         if (!ieee80211_is_data(hdr->frame_control) ||
 779             info->flags & IEEE80211_TX_CTL_NO_ACK)
 780                 return;
 781
 782         /* This packet was aggregated but doesn't carry status info */
 783         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 784             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 785                 return;
 786
 787         if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
 788             !lq_sta->ibss_sta_added)
 789                 return;
 790
 791         /*
 792          * Ignore this Tx frame response if its initial rate doesn't match
 793          * that of latest Link Quality command.  There may be stragglers
 794          * from a previous Link Quality command, but we're no longer interested
 795          * in those; they're either from the "active" mode while we're trying
 796          * to check "search" mode, or a prior "search" mode after we've moved
 797          * to a new "search" mode (which might become the new "active" mode).
 798          */
 799         table = &lq_sta->lq;
 800         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 801         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 802         if (priv->band == IEEE80211_BAND_5GHZ)
 803                 rs_index -= IWL_FIRST_OFDM_RATE;
 804         mac_flags = info->status.rates[0].flags;
 805         mac_index = info->status.rates[0].idx;
 806         /* For HT packets, map MCS to PLCP */
 807         if (mac_flags & IEEE80211_TX_RC_MCS) {
 808                 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
 809                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 810                         mac_index++;
 811                 /*
 812                  * mac80211 HT index is always zero-indexed; we need to move
 813                  * HT OFDM rates after CCK rates in 2.4 GHz band
 814                  */
 815                 if (priv->band == IEEE80211_BAND_2GHZ)
 816                         mac_index += IWL_FIRST_OFDM_RATE;
 817         }
 818         /* Here we actually compare this rate to the latest LQ command */
 819         if ((mac_index < 0) ||
 820             (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 821             (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 822             (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
 823             (tbl_type.ant_type != info->antenna_sel_tx) ||
 824             (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 825             (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 826             (rs_index != mac_index)) {
 827                 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
 828                 /*
 829                  * Since rates mis-match, the last LQ command may have failed.
 830                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 831                  * ... driver.
 832                  */
 833                 lq_sta->missed_rate_counter++;
 834                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 835                         lq_sta->missed_rate_counter = 0;
 836                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
 837                 }
 838                 /* Regardless, ignore this status info for outdated rate */
 839                 return;
 840         } else
 841                 /* Rate did match, so reset the missed_rate_counter */
 842                 lq_sta->missed_rate_counter = 0;
 843
 844         /* Figure out if rate scale algorithm is in active or search table */
 845         if (table_type_matches(&tbl_type,
 846                                 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 847                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 848                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 849         } else if (table_type_matches(&tbl_type,
 850                                 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
 851                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 852                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 853         } else {
 854                 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
 855                 return;
 856         }
 857
 858         /*
 859          * Updating the frame history depends on whether packets were
 860          * aggregated.
 861          *
 862          * For aggregation, all packets were transmitted at the same rate, the
 863          * first index into rate scale table.
 864          */
 865         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
 866                 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 867                 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
 868                                 &rs_index);
 869                 rs_collect_tx_data(curr_tbl, rs_index,
 870                                    info->status.ampdu_ack_len,
 871                                    info->status.ampdu_ack_map);
 872
 873                 /* Update success/fail counts if not searching for new mode */
 874                 if (lq_sta->stay_in_tbl) {
 875                         lq_sta->total_success += info->status.ampdu_ack_map;
 876                         lq_sta->total_failed += (info->status.ampdu_ack_len -
 877                                         info->status.ampdu_ack_map);
 878                 }
 879         } else {
 880         /*
 881          * For legacy, update frame history with for each Tx retry.
 882          */
 883                 retries = info->status.rates[0].count - 1;
 884                 /* HW doesn't send more than 15 retries */
 885                 retries = min(retries, 15);
 886
 887                 /* The last transmission may have been successful */
 888                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
 889                 /* Collect data for each rate used during failed TX attempts */
 890                 for (i = 0; i <= retries; ++i) {
 891                         tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
 892                         rs_get_tbl_info_from_mcs(tx_rate, priv->band,
 893                                         &tbl_type, &rs_index);
 894                         /*
 895                          * Only collect stats if retried rate is in the same RS
 896                          * table as active/search.
 897                          */
 898                         if (table_type_matches(&tbl_type, curr_tbl))
 899                                 tmp_tbl = curr_tbl;
 900                         else if (table_type_matches(&tbl_type, other_tbl))
 901                                 tmp_tbl = other_tbl;
 902                         else
 903                                 continue;
 904                         rs_collect_tx_data(tmp_tbl, rs_index, 1,
 905                                            i < retries ? 0 : legacy_success);
 906                 }
 907
 908                 /* Update success/fail counts if not searching for new mode */
 909                 if (lq_sta->stay_in_tbl) {
 910                         lq_sta->total_success += legacy_success;
 911                         lq_sta->total_failed += retries + (1 - legacy_success);
 912                 }
 913         }
 914         /* The last TX rate is cached in lq_sta; it's set in if/else above */
 915         lq_sta->last_rate_n_flags = tx_rate;
 916
 917         /* See if there's a better rate or modulation mode to try. */
 918         if (sta && sta->supp_rates[sband->band])
 919                 rs_rate_scale_perform(priv, skb, sta, lq_sta);
 920 }
 921
 922 /*
 923  * Begin a period of staying with a selected modulation mode.
 924  * Set "stay_in_tbl" flag to prevent any mode switches.
 925  * Set frame tx success limits according to legacy vs. high-throughput,
 926  * and reset overall (spanning all rates) tx success history statistics.
 927  * These control how long we stay using same modulation mode before
 928  * searching for a new mode.
 929  */
 930 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
 931                                  struct iwl_lq_sta *lq_sta)
 932 {
 933         IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
 934         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
 935         if (is_legacy) {
 936                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
 937                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
 938                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
 939         } else {
 940                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
 941                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
 942                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
 943         }
 944         lq_sta->table_count = 0;
 945         lq_sta->total_failed = 0;
 946         lq_sta->total_success = 0;
 947         lq_sta->flush_timer = jiffies;
 948         lq_sta->action_counter = 0;
 949 }
 950
 951 /*
 952  * Find correct throughput table for given mode of modulation
 953  */
 954 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
 955                                       struct iwl_scale_tbl_info *tbl)
 956 {
 957         /* Used to choose among HT tables */
 958         s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
 959
 960         /* Check for invalid LQ type */
 961         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
 962                 tbl->expected_tpt = expected_tpt_legacy;
 963                 return;
 964         }
 965
 966         /* Legacy rates have only one table */
 967         if (is_legacy(tbl->lq_type)) {
 968                 tbl->expected_tpt = expected_tpt_legacy;
 969                 return;
 970         }
 971
 972         /* Choose among many HT tables depending on number of streams
 973          * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
 974          * status */
 975         if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
 976                 ht_tbl_pointer = expected_tpt_siso20MHz;
 977         else if (is_siso(tbl->lq_type))
 978                 ht_tbl_pointer = expected_tpt_siso40MHz;
 979         else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
 980                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
 981         else if (is_mimo2(tbl->lq_type))
 982                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
 983         else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
 984                 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
 985         else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
 986                 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
 987
 988         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
 989                 tbl->expected_tpt = ht_tbl_pointer[0];
 990         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
 991                 tbl->expected_tpt = ht_tbl_pointer[1];
 992         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
 993                 tbl->expected_tpt = ht_tbl_pointer[2];
 994         else                                            /* AGG+SGI */
 995                 tbl->expected_tpt = ht_tbl_pointer[3];
 996 }
 997
 998 /*
 999  * Find starting rate for new "search" high-throughput mode of modulation.
1000  * Goal is to find lowest expected rate (under perfect conditions) that is
1001  * above the current measured throughput of "active" mode, to give new mode
1002  * a fair chance to prove itself without too many challenges.
1003  *
1004  * This gets called when transitioning to more aggressive modulation
1005  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1006  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1007  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1008  * bit rate will typically need to increase, but not if performance was bad.
1009  */
1010 static s32 rs_get_best_rate(struct iwl_priv *priv,
1011                             struct iwl_lq_sta *lq_sta,
1012                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1013                             u16 rate_mask, s8 index)
1014 {
1015         /* "active" values */
1016         struct iwl_scale_tbl_info *active_tbl =
1017             &(lq_sta->lq_info[lq_sta->active_tbl]);
1018         s32 active_sr = active_tbl->win[index].success_ratio;
1019         s32 active_tpt = active_tbl->expected_tpt[index];
1020
1021         /* expected "search" throughput */
1022         s32 *tpt_tbl = tbl->expected_tpt;
1023
1024         s32 new_rate, high, low, start_hi;
1025         u16 high_low;
1026         s8 rate = index;
1027
1028         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1029
1030         for (; ;) {
1031                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1032                                                 tbl->lq_type);
1033
1034                 low = high_low & 0xff;
1035                 high = (high_low >> 8) & 0xff;
1036
1037                 /*
1038                  * Lower the "search" bit rate, to give new "search" mode
1039                  * approximately the same throughput as "active" if:
1040                  *
1041                  * 1) "Active" mode has been working modestly well (but not
1042                  *    great), and expected "search" throughput (under perfect
1043                  *    conditions) at candidate rate is above the actual
1044                  *    measured "active" throughput (but less than expected
1045                  *    "active" throughput under perfect conditions).
1046                  * OR
1047                  * 2) "Active" mode has been working perfectly or very well
1048                  *    and expected "search" throughput (under perfect
1049                  *    conditions) at candidate rate is above expected
1050                  *    "active" throughput (under perfect conditions).
1051                  */
1052                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1053                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1054                       (active_sr <= IWL_RATE_HIGH_TH) &&
1055                       (tpt_tbl[rate] <= active_tpt))) ||
1056                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1057                      (tpt_tbl[rate] > active_tpt))) {
1058
1059                         /* (2nd or later pass)
1060                          * If we've already tried to raise the rate, and are
1061                          * now trying to lower it, use the higher rate. */
1062                         if (start_hi != IWL_RATE_INVALID) {
1063                                 new_rate = start_hi;
1064                                 break;
1065                         }
1066
1067                         new_rate = rate;
1068
1069                         /* Loop again with lower rate */
1070                         if (low != IWL_RATE_INVALID)
1071                                 rate = low;
1072
1073                         /* Lower rate not available, use the original */
1074                         else
1075                                 break;
1076
1077                 /* Else try to raise the "search" rate to match "active" */
1078                 } else {
1079                         /* (2nd or later pass)
1080                          * If we've already tried to lower the rate, and are
1081                          * now trying to raise it, use the lower rate. */
1082                         if (new_rate != IWL_RATE_INVALID)
1083                                 break;
1084
1085                         /* Loop again with higher rate */
1086                         else if (high != IWL_RATE_INVALID) {
1087                                 start_hi = high;
1088                                 rate = high;
1089
1090                         /* Higher rate not available, use the original */
1091                         } else {
1092                                 new_rate = rate;
1093                                 break;
1094                         }
1095                 }
1096         }
1097
1098         return new_rate;
1099 }
1100
1101 /*
1102  * Set up search table for MIMO2
1103  */
1104 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1105                              struct iwl_lq_sta *lq_sta,
1106                              struct ieee80211_conf *conf,
1107                              struct ieee80211_sta *sta,
1108                              struct iwl_scale_tbl_info *tbl, int index)
1109 {
1110         u16 rate_mask;
1111         s32 rate;
1112         s8 is_green = lq_sta->is_green;
1113
1114         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1115                 return -1;
1116
1117         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1118                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1119                 return -1;
1120
1121         /* Need both Tx chains/antennas to support MIMO */
1122         if (priv->hw_params.tx_chains_num < 2)
1123                 return -1;
1124
1125         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1126
1127         tbl->lq_type = LQ_MIMO2;
1128         tbl->is_dup = lq_sta->is_dup;
1129         tbl->action = 0;
1130         tbl->max_search = IWL_MAX_SEARCH;
1131         rate_mask = lq_sta->active_mimo2_rate;
1132
1133         if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1134                 tbl->is_ht40 = 1;
1135         else
1136                 tbl->is_ht40 = 0;
1137
1138         rs_set_expected_tpt_table(lq_sta, tbl);
1139
1140         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1141
1142         IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1143         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1144                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1145                                                 rate, rate_mask);
1146                 return -1;
1147         }
1148         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1149
1150         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1151                      tbl->current_rate, is_green);
1152         return 0;
1153 }
1154
1155 /*
1156  * Set up search table for MIMO3
1157  */
1158 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1159                              struct iwl_lq_sta *lq_sta,
1160                              struct ieee80211_conf *conf,
1161                              struct ieee80211_sta *sta,
1162                              struct iwl_scale_tbl_info *tbl, int index)
1163 {
1164         u16 rate_mask;
1165         s32 rate;
1166         s8 is_green = lq_sta->is_green;
1167
1168         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1169                 return -1;
1170
1171         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1172                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1173                 return -1;
1174
1175         /* Need both Tx chains/antennas to support MIMO */
1176         if (priv->hw_params.tx_chains_num < 3)
1177                 return -1;
1178
1179         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1180
1181         tbl->lq_type = LQ_MIMO3;
1182         tbl->is_dup = lq_sta->is_dup;
1183         tbl->action = 0;
1184         tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1185         rate_mask = lq_sta->active_mimo3_rate;
1186
1187         if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1188                 tbl->is_ht40 = 1;
1189         else
1190                 tbl->is_ht40 = 0;
1191
1192         rs_set_expected_tpt_table(lq_sta, tbl);
1193
1194         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1195
1196         IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1197                 rate, rate_mask);
1198         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1199                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1200                                                 rate, rate_mask);
1201                 return -1;
1202         }
1203         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1204
1205         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1206                      tbl->current_rate, is_green);
1207         return 0;
1208 }
1209
1210 /*
1211  * Set up search table for SISO
1212  */
1213 static int rs_switch_to_siso(struct iwl_priv *priv,
1214                              struct iwl_lq_sta *lq_sta,
1215                              struct ieee80211_conf *conf,
1216                              struct ieee80211_sta *sta,
1217                              struct iwl_scale_tbl_info *tbl, int index)
1218 {
1219         u16 rate_mask;
1220         u8 is_green = lq_sta->is_green;
1221         s32 rate;
1222
1223         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1224                 return -1;
1225
1226         IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1227
1228         tbl->is_dup = lq_sta->is_dup;
1229         tbl->lq_type = LQ_SISO;
1230         tbl->action = 0;
1231         tbl->max_search = IWL_MAX_SEARCH;
1232         rate_mask = lq_sta->active_siso_rate;
1233
1234         if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1235                 tbl->is_ht40 = 1;
1236         else
1237                 tbl->is_ht40 = 0;
1238
1239         if (is_green)
1240                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1241
1242         rs_set_expected_tpt_table(lq_sta, tbl);
1243         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1244
1245         IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1246         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1247                 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1248                              rate, rate_mask);
1249                 return -1;
1250         }
1251         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1252         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1253                      tbl->current_rate, is_green);
1254         return 0;
1255 }
1256
1257 /*
1258  * Try to switch to new modulation mode from legacy
1259  */
1260 static int rs_move_legacy_other(struct iwl_priv *priv,
1261                                 struct iwl_lq_sta *lq_sta,
1262                                 struct ieee80211_conf *conf,
1263                                 struct ieee80211_sta *sta,
1264                                 int index)
1265 {
1266         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1267         struct iwl_scale_tbl_info *search_tbl =
1268                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1269         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1270         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1271                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1272         u8 start_action = tbl->action;
1273         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1274         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1275         int ret = 0;
1276         u8 update_search_tbl_counter = 0;
1277
1278         if (!iwl_ht_enabled(priv))
1279                 /* stay in Legacy */
1280                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1281         else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1282                    tbl->action > IWL_LEGACY_SWITCH_SISO)
1283                 tbl->action = IWL_LEGACY_SWITCH_SISO;
1284         for (; ;) {
1285                 lq_sta->action_counter++;
1286                 switch (tbl->action) {
1287                 case IWL_LEGACY_SWITCH_ANTENNA1:
1288                 case IWL_LEGACY_SWITCH_ANTENNA2:
1289                         IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1290
1291                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1292                                                         tx_chains_num <= 1) ||
1293                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1294                                                         tx_chains_num <= 2))
1295                                 break;
1296
1297                         /* Don't change antenna if success has been great */
1298                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1299                                 break;
1300
1301                         /* Set up search table to try other antenna */
1302                         memcpy(search_tbl, tbl, sz);
1303
1304                         if (rs_toggle_antenna(valid_tx_ant,
1305                                 &search_tbl->current_rate, search_tbl)) {
1306                                 update_search_tbl_counter = 1;
1307                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1308                                 goto out;
1309                         }
1310                         break;
1311                 case IWL_LEGACY_SWITCH_SISO:
1312                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1313
1314                         /* Set up search table to try SISO */
1315                         memcpy(search_tbl, tbl, sz);
1316                         search_tbl->is_SGI = 0;
1317                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1318                                                  search_tbl, index);
1319                         if (!ret) {
1320                                 lq_sta->action_counter = 0;
1321                                 goto out;
1322                         }
1323
1324                         break;
1325                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1326                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1327                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1328                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1329
1330                         /* Set up search table to try MIMO */
1331                         memcpy(search_tbl, tbl, sz);
1332                         search_tbl->is_SGI = 0;
1333
1334                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1335                                 search_tbl->ant_type = ANT_AB;
1336                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1337                                 search_tbl->ant_type = ANT_AC;
1338                         else
1339                                 search_tbl->ant_type = ANT_BC;
1340
1341                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1342                                 break;
1343
1344                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1345                                                  search_tbl, index);
1346                         if (!ret) {
1347                                 lq_sta->action_counter = 0;
1348                                 goto out;
1349                         }
1350                         break;
1351
1352                 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1353                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1354
1355                         /* Set up search table to try MIMO3 */
1356                         memcpy(search_tbl, tbl, sz);
1357                         search_tbl->is_SGI = 0;
1358
1359                         search_tbl->ant_type = ANT_ABC;
1360
1361                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1362                                 break;
1363
1364                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1365                                                  search_tbl, index);
1366                         if (!ret) {
1367                                 lq_sta->action_counter = 0;
1368                                 goto out;
1369                         }
1370                         break;
1371                 }
1372                 tbl->action++;
1373                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1374                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1375
1376                 if (tbl->action == start_action)
1377                         break;
1378
1379         }
1380         search_tbl->lq_type = LQ_NONE;
1381         return 0;
1382
1383 out:
1384         lq_sta->search_better_tbl = 1;
1385         tbl->action++;
1386         if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1387                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1388         if (update_search_tbl_counter)
1389                 search_tbl->action = tbl->action;
1390         return 0;
1391
1392 }
1393
1394 /*
1395  * Try to switch to new modulation mode from SISO
1396  */
1397 static int rs_move_siso_to_other(struct iwl_priv *priv,
1398                                  struct iwl_lq_sta *lq_sta,
1399                                  struct ieee80211_conf *conf,
1400                                  struct ieee80211_sta *sta, int index)
1401 {
1402         u8 is_green = lq_sta->is_green;
1403         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1404         struct iwl_scale_tbl_info *search_tbl =
1405                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1406         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1407         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1408         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1409                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1410         u8 start_action = tbl->action;
1411         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1412         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1413         u8 update_search_tbl_counter = 0;
1414         int ret;
1415
1416         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1417             tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1418                 /* stay in SISO */
1419                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1420         }
1421         for (;;) {
1422                 lq_sta->action_counter++;
1423                 switch (tbl->action) {
1424                 case IWL_SISO_SWITCH_ANTENNA1:
1425                 case IWL_SISO_SWITCH_ANTENNA2:
1426                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1427
1428                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1429                                                         tx_chains_num <= 1) ||
1430                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1431                                                         tx_chains_num <= 2))
1432                                 break;
1433
1434                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1435                                 break;
1436
1437                         memcpy(search_tbl, tbl, sz);
1438                         if (rs_toggle_antenna(valid_tx_ant,
1439                                        &search_tbl->current_rate, search_tbl)) {
1440                                 update_search_tbl_counter = 1;
1441                                 goto out;
1442                         }
1443                         break;
1444                 case IWL_SISO_SWITCH_MIMO2_AB:
1445                 case IWL_SISO_SWITCH_MIMO2_AC:
1446                 case IWL_SISO_SWITCH_MIMO2_BC:
1447                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1448                         memcpy(search_tbl, tbl, sz);
1449                         search_tbl->is_SGI = 0;
1450
1451                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1452                                 search_tbl->ant_type = ANT_AB;
1453                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1454                                 search_tbl->ant_type = ANT_AC;
1455                         else
1456                                 search_tbl->ant_type = ANT_BC;
1457
1458                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1459                                 break;
1460
1461                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1462                                                  search_tbl, index);
1463                         if (!ret)
1464                                 goto out;
1465                         break;
1466                 case IWL_SISO_SWITCH_GI:
1467                         if (!tbl->is_ht40 && !(ht_cap->cap &
1468                                                 IEEE80211_HT_CAP_SGI_20))
1469                                 break;
1470                         if (tbl->is_ht40 && !(ht_cap->cap &
1471                                                 IEEE80211_HT_CAP_SGI_40))
1472                                 break;
1473
1474                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1475
1476                         memcpy(search_tbl, tbl, sz);
1477                         if (is_green) {
1478                                 if (!tbl->is_SGI)
1479                                         break;
1480                                 else
1481                                         IWL_ERR(priv,
1482                                                 "SGI was set in GF+SISO\n");
1483                         }
1484                         search_tbl->is_SGI = !tbl->is_SGI;
1485                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1486                         if (tbl->is_SGI) {
1487                                 s32 tpt = lq_sta->last_tpt / 100;
1488                                 if (tpt >= search_tbl->expected_tpt[index])
1489                                         break;
1490                         }
1491                         search_tbl->current_rate =
1492                                 rate_n_flags_from_tbl(priv, search_tbl,
1493                                                       index, is_green);
1494                         update_search_tbl_counter = 1;
1495                         goto out;
1496                 case IWL_SISO_SWITCH_MIMO3_ABC:
1497                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1498                         memcpy(search_tbl, tbl, sz);
1499                         search_tbl->is_SGI = 0;
1500                         search_tbl->ant_type = ANT_ABC;
1501
1502                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1503                                 break;
1504
1505                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1506                                                  search_tbl, index);
1507                         if (!ret)
1508                                 goto out;
1509                         break;
1510                 }
1511                 tbl->action++;
1512                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1513                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1514
1515                 if (tbl->action == start_action)
1516                         break;
1517         }
1518         search_tbl->lq_type = LQ_NONE;
1519         return 0;
1520
1521  out:
1522         lq_sta->search_better_tbl = 1;
1523         tbl->action++;
1524         if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1525                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1526         if (update_search_tbl_counter)
1527                 search_tbl->action = tbl->action;
1528
1529         return 0;
1530 }
1531
1532 /*
1533  * Try to switch to new modulation mode from MIMO2
1534  */
1535 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1536                                  struct iwl_lq_sta *lq_sta,
1537                                  struct ieee80211_conf *conf,
1538                                  struct ieee80211_sta *sta, int index)
1539 {
1540         s8 is_green = lq_sta->is_green;
1541         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1542         struct iwl_scale_tbl_info *search_tbl =
1543                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1544         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1545         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1546         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1547                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1548         u8 start_action = tbl->action;
1549         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1550         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1551         u8 update_search_tbl_counter = 0;
1552         int ret;
1553
1554         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1555             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1556              tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1557                 /* switch in SISO */
1558                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1559         }
1560         for (;;) {
1561                 lq_sta->action_counter++;
1562                 switch (tbl->action) {
1563                 case IWL_MIMO2_SWITCH_ANTENNA1:
1564                 case IWL_MIMO2_SWITCH_ANTENNA2:
1565                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1566
1567                         if (tx_chains_num <= 2)
1568                                 break;
1569
1570                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1571                                 break;
1572
1573                         memcpy(search_tbl, tbl, sz);
1574                         if (rs_toggle_antenna(valid_tx_ant,
1575                                        &search_tbl->current_rate, search_tbl)) {
1576                                 update_search_tbl_counter = 1;
1577                                 goto out;
1578                         }
1579                         break;
1580                 case IWL_MIMO2_SWITCH_SISO_A:
1581                 case IWL_MIMO2_SWITCH_SISO_B:
1582                 case IWL_MIMO2_SWITCH_SISO_C:
1583                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1584
1585                         /* Set up new search table for SISO */
1586                         memcpy(search_tbl, tbl, sz);
1587
1588                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1589                                 search_tbl->ant_type = ANT_A;
1590                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1591                                 search_tbl->ant_type = ANT_B;
1592                         else
1593                                 search_tbl->ant_type = ANT_C;
1594
1595                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1596                                 break;
1597
1598                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1599                                                  search_tbl, index);
1600                         if (!ret)
1601                                 goto out;
1602
1603                         break;
1604
1605                 case IWL_MIMO2_SWITCH_GI:
1606                         if (!tbl->is_ht40 && !(ht_cap->cap &
1607                                                 IEEE80211_HT_CAP_SGI_20))
1608                                 break;
1609                         if (tbl->is_ht40 && !(ht_cap->cap &
1610                                                 IEEE80211_HT_CAP_SGI_40))
1611                                 break;
1612
1613                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1614
1615                         /* Set up new search table for MIMO2 */
1616                         memcpy(search_tbl, tbl, sz);
1617                         search_tbl->is_SGI = !tbl->is_SGI;
1618                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1619                         /*
1620                          * If active table already uses the fastest possible
1621                          * modulation (dual stream with short guard interval),
1622                          * and it's working well, there's no need to look
1623                          * for a better type of modulation!
1624                          */
1625                         if (tbl->is_SGI) {
1626                                 s32 tpt = lq_sta->last_tpt / 100;
1627                                 if (tpt >= search_tbl->expected_tpt[index])
1628                                         break;
1629                         }
1630                         search_tbl->current_rate =
1631                                 rate_n_flags_from_tbl(priv, search_tbl,
1632                                                       index, is_green);
1633                         update_search_tbl_counter = 1;
1634                         goto out;
1635
1636                 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1637                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1638                         memcpy(search_tbl, tbl, sz);
1639                         search_tbl->is_SGI = 0;
1640                         search_tbl->ant_type = ANT_ABC;
1641
1642                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1643                                 break;
1644
1645                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1646                                                  search_tbl, index);
1647                         if (!ret)
1648                                 goto out;
1649
1650                         break;
1651                 }
1652                 tbl->action++;
1653                 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1654                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1655
1656                 if (tbl->action == start_action)
1657                         break;
1658         }
1659         search_tbl->lq_type = LQ_NONE;
1660         return 0;
1661  out:
1662         lq_sta->search_better_tbl = 1;
1663         tbl->action++;
1664         if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1665                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1666         if (update_search_tbl_counter)
1667                 search_tbl->action = tbl->action;
1668
1669         return 0;
1670
1671 }
1672
1673 /*
1674  * Try to switch to new modulation mode from MIMO3
1675  */
1676 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1677                                  struct iwl_lq_sta *lq_sta,
1678                                  struct ieee80211_conf *conf,
1679                                  struct ieee80211_sta *sta, int index)
1680 {
1681         s8 is_green = lq_sta->is_green;
1682         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1683         struct iwl_scale_tbl_info *search_tbl =
1684                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1685         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1686         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1687         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1688                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1689         u8 start_action = tbl->action;
1690         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1691         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1692         int ret;
1693         u8 update_search_tbl_counter = 0;
1694
1695         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1696             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1697              tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1698                 /* switch in SISO */
1699                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1700         }
1701         for (;;) {
1702                 lq_sta->action_counter++;
1703                 switch (tbl->action) {
1704                 case IWL_MIMO3_SWITCH_ANTENNA1:
1705                 case IWL_MIMO3_SWITCH_ANTENNA2:
1706                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1707
1708                         if (tx_chains_num <= 3)
1709                                 break;
1710
1711                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1712                                 break;
1713
1714                         memcpy(search_tbl, tbl, sz);
1715                         if (rs_toggle_antenna(valid_tx_ant,
1716                                        &search_tbl->current_rate, search_tbl))
1717                                 goto out;
1718                         break;
1719                 case IWL_MIMO3_SWITCH_SISO_A:
1720                 case IWL_MIMO3_SWITCH_SISO_B:
1721                 case IWL_MIMO3_SWITCH_SISO_C:
1722                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1723
1724                         /* Set up new search table for SISO */
1725                         memcpy(search_tbl, tbl, sz);
1726
1727                         if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1728                                 search_tbl->ant_type = ANT_A;
1729                         else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1730                                 search_tbl->ant_type = ANT_B;
1731                         else
1732                                 search_tbl->ant_type = ANT_C;
1733
1734                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1735                                 break;
1736
1737                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1738                                                  search_tbl, index);
1739                         if (!ret)
1740                                 goto out;
1741
1742                         break;
1743
1744                 case IWL_MIMO3_SWITCH_MIMO2_AB:
1745                 case IWL_MIMO3_SWITCH_MIMO2_AC:
1746                 case IWL_MIMO3_SWITCH_MIMO2_BC:
1747                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1748
1749                         memcpy(search_tbl, tbl, sz);
1750                         search_tbl->is_SGI = 0;
1751                         if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1752                                 search_tbl->ant_type = ANT_AB;
1753                         else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1754                                 search_tbl->ant_type = ANT_AC;
1755                         else
1756                                 search_tbl->ant_type = ANT_BC;
1757
1758                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1759                                 break;
1760
1761                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1762                                                  search_tbl, index);
1763                         if (!ret)
1764                                 goto out;
1765
1766                         break;
1767
1768                 case IWL_MIMO3_SWITCH_GI:
1769                         if (!tbl->is_ht40 && !(ht_cap->cap &
1770                                                 IEEE80211_HT_CAP_SGI_20))
1771                                 break;
1772                         if (tbl->is_ht40 && !(ht_cap->cap &
1773                                                 IEEE80211_HT_CAP_SGI_40))
1774                                 break;
1775
1776                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1777
1778                         /* Set up new search table for MIMO */
1779                         memcpy(search_tbl, tbl, sz);
1780                         search_tbl->is_SGI = !tbl->is_SGI;
1781                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1782                         /*
1783                          * If active table already uses the fastest possible
1784                          * modulation (dual stream with short guard interval),
1785                          * and it's working well, there's no need to look
1786                          * for a better type of modulation!
1787                          */
1788                         if (tbl->is_SGI) {
1789                                 s32 tpt = lq_sta->last_tpt / 100;
1790                                 if (tpt >= search_tbl->expected_tpt[index])
1791                                         break;
1792                         }
1793                         search_tbl->current_rate =
1794                                 rate_n_flags_from_tbl(priv, search_tbl,
1795                                                       index, is_green);
1796                         update_search_tbl_counter = 1;
1797                         goto out;
1798                 }
1799                 tbl->action++;
1800                 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1801                         tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1802
1803                 if (tbl->action == start_action)
1804                         break;
1805         }
1806         search_tbl->lq_type = LQ_NONE;
1807         return 0;
1808  out:
1809         lq_sta->search_better_tbl = 1;
1810         tbl->action++;
1811         if (tbl->action > IWL_MIMO3_SWITCH_GI)
1812                 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1813         if (update_search_tbl_counter)
1814                 search_tbl->action = tbl->action;
1815
1816         return 0;
1817
1818 }
1819
1820 /*
1821  * Check whether we should continue using same modulation mode, or
1822  * begin search for a new mode, based on:
1823  * 1) # tx successes or failures while using this mode
1824  * 2) # times calling this function
1825  * 3) elapsed time in this mode (not used, for now)
1826  */
1827 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1828 {
1829         struct iwl_scale_tbl_info *tbl;
1830         int i;
1831         int active_tbl;
1832         int flush_interval_passed = 0;
1833         struct iwl_priv *priv;
1834
1835         priv = lq_sta->drv;
1836         active_tbl = lq_sta->active_tbl;
1837
1838         tbl = &(lq_sta->lq_info[active_tbl]);
1839
1840         /* If we've been disallowing search, see if we should now allow it */
1841         if (lq_sta->stay_in_tbl) {
1842
1843                 /* Elapsed time using current modulation mode */
1844                 if (lq_sta->flush_timer)
1845                         flush_interval_passed =
1846                         time_after(jiffies,
1847                                         (unsigned long)(lq_sta->flush_timer +
1848                                         IWL_RATE_SCALE_FLUSH_INTVL));
1849
1850                 /*
1851                  * Check if we should allow search for new modulation mode.
1852                  * If many frames have failed or succeeded, or we've used
1853                  * this same modulation for a long time, allow search, and
1854                  * reset history stats that keep track of whether we should
1855                  * allow a new search.  Also (below) reset all bitmaps and
1856                  * stats in active history.
1857                  */
1858                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1859                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1860                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1861                      && (flush_interval_passed))) {
1862                         IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
1863                                      lq_sta->total_failed,
1864                                      lq_sta->total_success,
1865                                      flush_interval_passed);
1866
1867                         /* Allow search for new mode */
1868                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1869                         lq_sta->total_failed = 0;
1870                         lq_sta->total_success = 0;
1871                         lq_sta->flush_timer = 0;
1872
1873                 /*
1874                  * Else if we've used this modulation mode enough repetitions
1875                  * (regardless of elapsed time or success/failure), reset
1876                  * history bitmaps and rate-specific stats for all rates in
1877                  * active table.
1878                  */
1879                 } else {
1880                         lq_sta->table_count++;
1881                         if (lq_sta->table_count >=
1882                             lq_sta->table_count_limit) {
1883                                 lq_sta->table_count = 0;
1884
1885                                 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
1886                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1887                                         rs_rate_scale_clear_window(
1888                                                 &(tbl->win[i]));
1889                         }
1890                 }
1891
1892                 /* If transitioning to allow "search", reset all history
1893                  * bitmaps and stats in active table (this will become the new
1894                  * "search" table). */
1895                 if (!lq_sta->stay_in_tbl) {
1896                         for (i = 0; i < IWL_RATE_COUNT; i++)
1897                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1898                 }
1899         }
1900 }
1901
1902 /*
1903  * setup rate table in uCode
1904  * return rate_n_flags as used in the table
1905  */
1906 static u32 rs_update_rate_tbl(struct iwl_priv *priv,
1907                                 struct iwl_lq_sta *lq_sta,
1908                                 struct iwl_scale_tbl_info *tbl,
1909                                 int index, u8 is_green)
1910 {
1911         u32 rate;
1912
1913         /* Update uCode's rate table. */
1914         rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
1915         rs_fill_link_cmd(priv, lq_sta, rate);
1916         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1917
1918         return rate;
1919 }
1920
1921 /*
1922  * Do rate scaling and search for new modulation mode.
1923  */
1924 static void rs_rate_scale_perform(struct iwl_priv *priv,
1925                                   struct sk_buff *skb,
1926                                   struct ieee80211_sta *sta,
1927                                   struct iwl_lq_sta *lq_sta)
1928 {
1929         struct ieee80211_hw *hw = priv->hw;
1930         struct ieee80211_conf *conf = &hw->conf;
1931         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1932         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1933         int low = IWL_RATE_INVALID;
1934         int high = IWL_RATE_INVALID;
1935         int index;
1936         int i;
1937         struct iwl_rate_scale_data *window = NULL;
1938         int current_tpt = IWL_INVALID_VALUE;
1939         int low_tpt = IWL_INVALID_VALUE;
1940         int high_tpt = IWL_INVALID_VALUE;
1941         u32 fail_count;
1942         s8 scale_action = 0;
1943         u16 rate_mask;
1944         u8 update_lq = 0;
1945         struct iwl_scale_tbl_info *tbl, *tbl1;
1946         u16 rate_scale_index_msk = 0;
1947         u32 rate;
1948         u8 is_green = 0;
1949         u8 active_tbl = 0;
1950         u8 done_search = 0;
1951         u16 high_low;
1952         s32 sr;
1953         u8 tid = MAX_TID_COUNT;
1954         struct iwl_tid_data *tid_data;
1955
1956         IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
1957
1958         /* Send management frames and NO_ACK data using lowest rate. */
1959         /* TODO: this could probably be improved.. */
1960         if (!ieee80211_is_data(hdr->frame_control) ||
1961             info->flags & IEEE80211_TX_CTL_NO_ACK)
1962                 return;
1963
1964         if (!sta || !lq_sta)
1965                 return;
1966
1967         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1968
1969         tid = rs_tl_add_packet(lq_sta, hdr);
1970         if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1971                 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
1972                 if (tid_data->agg.state == IWL_AGG_OFF)
1973                         lq_sta->is_agg = 0;
1974                 else
1975                         lq_sta->is_agg = 1;
1976         } else
1977                 lq_sta->is_agg = 0;
1978
1979         /*
1980          * Select rate-scale / modulation-mode table to work with in
1981          * the rest of this function:  "search" if searching for better
1982          * modulation mode, or "active" if doing rate scaling within a mode.
1983          */
1984         if (!lq_sta->search_better_tbl)
1985                 active_tbl = lq_sta->active_tbl;
1986         else
1987                 active_tbl = 1 - lq_sta->active_tbl;
1988
1989         tbl = &(lq_sta->lq_info[active_tbl]);
1990         if (is_legacy(tbl->lq_type))
1991                 lq_sta->is_green = 0;
1992         else
1993                 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
1994         is_green = lq_sta->is_green;
1995
1996         /* current tx rate */
1997         index = lq_sta->last_txrate_idx;
1998
1999         IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2000                        tbl->lq_type);
2001
2002         /* rates available for this association, and for modulation mode */
2003         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2004
2005         IWL_DEBUG_RATE(priv, "mask 0x%04X \n", rate_mask);
2006
2007         /* mask with station rate restriction */
2008         if (is_legacy(tbl->lq_type)) {
2009                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2010                         /* supp_rates has no CCK bits in A mode */
2011                         rate_scale_index_msk = (u16) (rate_mask &
2012                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2013                 else
2014                         rate_scale_index_msk = (u16) (rate_mask &
2015                                                       lq_sta->supp_rates);
2016
2017         } else
2018                 rate_scale_index_msk = rate_mask;
2019
2020         if (!rate_scale_index_msk)
2021                 rate_scale_index_msk = rate_mask;
2022
2023         if (!((1 << index) & rate_scale_index_msk)) {
2024                 IWL_ERR(priv, "Current Rate is not valid\n");
2025                 if (lq_sta->search_better_tbl) {
2026                         /* revert to active table if search table is not valid*/
2027                         tbl->lq_type = LQ_NONE;
2028                         lq_sta->search_better_tbl = 0;
2029                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2030                         /* get "active" rate info */
2031                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2032                         rate = rs_update_rate_tbl(priv, lq_sta,
2033                                                   tbl, index, is_green);
2034                 }
2035                 return;
2036         }
2037
2038         /* Get expected throughput table and history window for current rate */
2039         if (!tbl->expected_tpt) {
2040                 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2041                 return;
2042         }
2043
2044         /* force user max rate if set by user */
2045         if ((lq_sta->max_rate_idx != -1) &&
2046             (lq_sta->max_rate_idx < index)) {
2047                 index = lq_sta->max_rate_idx;
2048                 update_lq = 1;
2049                 window = &(tbl->win[index]);
2050                 goto lq_update;
2051         }
2052
2053         window = &(tbl->win[index]);
2054
2055         /*
2056          * If there is not enough history to calculate actual average
2057          * throughput, keep analyzing results of more tx frames, without
2058          * changing rate or mode (bypass most of the rest of this function).
2059          * Set up new rate table in uCode only if old rate is not supported
2060          * in current association (use new rate found above).
2061          */
2062         fail_count = window->counter - window->success_counter;
2063         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2064                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2065                 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2066                                "for index %d\n",
2067                                window->success_counter, window->counter, index);
2068
2069                 /* Can't calculate this yet; not enough history */
2070                 window->average_tpt = IWL_INVALID_VALUE;
2071
2072                 /* Should we stay with this modulation mode,
2073                  * or search for a new one? */
2074                 rs_stay_in_table(lq_sta);
2075
2076                 goto out;
2077         }
2078         /* Else we have enough samples; calculate estimate of
2079          * actual average throughput */
2080
2081         /* Sanity-check TPT calculations */
2082         BUG_ON(window->average_tpt != ((window->success_ratio *
2083                         tbl->expected_tpt[index] + 64) / 128));
2084
2085         /* If we are searching for better modulation mode, check success. */
2086         if (lq_sta->search_better_tbl &&
2087             (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2088                 /* If good success, continue using the "search" mode;
2089                  * no need to send new link quality command, since we're
2090                  * continuing to use the setup that we've been trying. */
2091                 if (window->average_tpt > lq_sta->last_tpt) {
2092
2093                         IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2094                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2095                                         window->success_ratio,
2096                                         window->average_tpt,
2097                                         lq_sta->last_tpt);
2098
2099                         if (!is_legacy(tbl->lq_type))
2100                                 lq_sta->enable_counter = 1;
2101
2102                         /* Swap tables; "search" becomes "active" */
2103                         lq_sta->active_tbl = active_tbl;
2104                         current_tpt = window->average_tpt;
2105
2106                 /* Else poor success; go back to mode in "active" table */
2107                 } else {
2108
2109                         IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2110                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2111                                         window->success_ratio,
2112                                         window->average_tpt,
2113                                         lq_sta->last_tpt);
2114
2115                         /* Nullify "search" table */
2116                         tbl->lq_type = LQ_NONE;
2117
2118                         /* Revert to "active" table */
2119                         active_tbl = lq_sta->active_tbl;
2120                         tbl = &(lq_sta->lq_info[active_tbl]);
2121
2122                         /* Revert to "active" rate and throughput info */
2123                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2124                         current_tpt = lq_sta->last_tpt;
2125
2126                         /* Need to set up a new rate table in uCode */
2127                         update_lq = 1;
2128                 }
2129
2130                 /* Either way, we've made a decision; modulation mode
2131                  * search is done, allow rate adjustment next time. */
2132                 lq_sta->search_better_tbl = 0;
2133                 done_search = 1;        /* Don't switch modes below! */
2134                 goto lq_update;
2135         }
2136
2137         /* (Else) not in search of better modulation mode, try for better
2138          * starting rate, while staying in this mode. */
2139         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2140                                         tbl->lq_type);
2141         low = high_low & 0xff;
2142         high = (high_low >> 8) & 0xff;
2143
2144         /* If user set max rate, dont allow higher than user constrain */
2145         if ((lq_sta->max_rate_idx != -1) &&
2146             (lq_sta->max_rate_idx < high))
2147                 high = IWL_RATE_INVALID;
2148
2149         sr = window->success_ratio;
2150
2151         /* Collect measured throughputs for current and adjacent rates */
2152         current_tpt = window->average_tpt;
2153         if (low != IWL_RATE_INVALID)
2154                 low_tpt = tbl->win[low].average_tpt;
2155         if (high != IWL_RATE_INVALID)
2156                 high_tpt = tbl->win[high].average_tpt;
2157
2158         scale_action = 0;
2159
2160         /* Too many failures, decrease rate */
2161         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2162                 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2163                 scale_action = -1;
2164
2165         /* No throughput measured yet for adjacent rates; try increase. */
2166         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2167                    (high_tpt == IWL_INVALID_VALUE)) {
2168
2169                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2170                         scale_action = 1;
2171                 else if (low != IWL_RATE_INVALID)
2172                         scale_action = 0;
2173         }
2174
2175         /* Both adjacent throughputs are measured, but neither one has better
2176          * throughput; we're using the best rate, don't change it! */
2177         else if ((low_tpt != IWL_INVALID_VALUE) &&
2178                  (high_tpt != IWL_INVALID_VALUE) &&
2179                  (low_tpt < current_tpt) &&
2180                  (high_tpt < current_tpt))
2181                 scale_action = 0;
2182
2183         /* At least one adjacent rate's throughput is measured,
2184          * and may have better performance. */
2185         else {
2186                 /* Higher adjacent rate's throughput is measured */
2187                 if (high_tpt != IWL_INVALID_VALUE) {
2188                         /* Higher rate has better throughput */
2189                         if (high_tpt > current_tpt &&
2190                                         sr >= IWL_RATE_INCREASE_TH) {
2191                                 scale_action = 1;
2192                         } else {
2193                                 scale_action = 0;
2194                         }
2195
2196                 /* Lower adjacent rate's throughput is measured */
2197                 } else if (low_tpt != IWL_INVALID_VALUE) {
2198                         /* Lower rate has better throughput */
2199                         if (low_tpt > current_tpt) {
2200                                 IWL_DEBUG_RATE(priv,
2201                                     "decrease rate because of low tpt\n");
2202                                 scale_action = -1;
2203                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2204                                 scale_action = 1;
2205                         }
2206                 }
2207         }
2208
2209         /* Sanity check; asked for decrease, but success rate or throughput
2210          * has been good at old rate.  Don't change it. */
2211         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2212                     ((sr > IWL_RATE_HIGH_TH) ||
2213                      (current_tpt > (100 * tbl->expected_tpt[low]))))
2214                 scale_action = 0;
2215         if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2216                 scale_action = -1;
2217         if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2218                 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2219                 scale_action = -1;
2220         switch (scale_action) {
2221         case -1:
2222                 /* Decrease starting rate, update uCode's rate table */
2223                 if (low != IWL_RATE_INVALID) {
2224                         update_lq = 1;
2225                         index = low;
2226                 }
2227
2228                 break;
2229         case 1:
2230                 /* Increase starting rate, update uCode's rate table */
2231                 if (high != IWL_RATE_INVALID) {
2232                         update_lq = 1;
2233                         index = high;
2234                 }
2235
2236                 break;
2237         case 0:
2238                 /* No change */
2239         default:
2240                 break;
2241         }
2242
2243         IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2244                     "high %d type %d\n",
2245                      index, scale_action, low, high, tbl->lq_type);
2246
2247 lq_update:
2248         /* Replace uCode's rate table for the destination station. */
2249         if (update_lq)
2250                 rate = rs_update_rate_tbl(priv, lq_sta,
2251                                           tbl, index, is_green);
2252
2253         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2254                 /* Should we stay with this modulation mode,
2255                  * or search for a new one? */
2256                 rs_stay_in_table(lq_sta);
2257         }
2258         /*
2259          * Search for new modulation mode if we're:
2260          * 1)  Not changing rates right now
2261          * 2)  Not just finishing up a search
2262          * 3)  Allowing a new search
2263          */
2264         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2265                 /* Save current throughput to compare with "search" throughput*/
2266                 lq_sta->last_tpt = current_tpt;
2267
2268                 /* Select a new "search" modulation mode to try.
2269                  * If one is found, set up the new "search" table. */
2270                 if (is_legacy(tbl->lq_type))
2271                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2272                 else if (is_siso(tbl->lq_type))
2273                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2274                 else if (is_mimo2(tbl->lq_type))
2275                         rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2276                 else
2277                         rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2278
2279                 /* If new "search" mode was selected, set up in uCode table */
2280                 if (lq_sta->search_better_tbl) {
2281                         /* Access the "search" table, clear its history. */
2282                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2283                         for (i = 0; i < IWL_RATE_COUNT; i++)
2284                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2285
2286                         /* Use new "search" start rate */
2287                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2288
2289                         IWL_DEBUG_RATE(priv, "Switch current  mcs: %X index: %d\n",
2290                                      tbl->current_rate, index);
2291                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2292                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2293                 } else
2294                         done_search = 1;
2295         }
2296
2297         if (done_search && !lq_sta->stay_in_tbl) {
2298                 /* If the "active" (non-search) mode was legacy,
2299                  * and we've tried switching antennas,
2300                  * but we haven't been able to try HT modes (not available),
2301                  * stay with best antenna legacy modulation for a while
2302                  * before next round of mode comparisons. */
2303                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2304                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2305                     lq_sta->action_counter > tbl1->max_search) {
2306                         IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2307                         rs_set_stay_in_table(priv, 1, lq_sta);
2308                 }
2309
2310                 /* If we're in an HT mode, and all 3 mode switch actions
2311                  * have been tried and compared, stay in this best modulation
2312                  * mode for a while before next round of mode comparisons. */
2313                 if (lq_sta->enable_counter &&
2314                     (lq_sta->action_counter >= tbl1->max_search) &&
2315                     iwl_ht_enabled(priv)) {
2316                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2317                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2318                             (tid != MAX_TID_COUNT)) {
2319                                 tid_data =
2320                                    &priv->stations[lq_sta->lq.sta_id].tid[tid];
2321                                 if (tid_data->agg.state == IWL_AGG_OFF) {
2322                                         IWL_DEBUG_RATE(priv,
2323                                                        "try to aggregate tid %d\n",
2324                                                        tid);
2325                                         rs_tl_turn_on_agg(priv, tid,
2326                                                           lq_sta, sta);
2327                                 }
2328                         }
2329                         rs_set_stay_in_table(priv, 0, lq_sta);
2330                 }
2331         }
2332
2333 out:
2334         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2335         i = index;
2336         lq_sta->last_txrate_idx = i;
2337
2338         return;
2339 }
2340
2341
2342 static void rs_initialize_lq(struct iwl_priv *priv,
2343                              struct ieee80211_conf *conf,
2344                              struct ieee80211_sta *sta,
2345                              struct iwl_lq_sta *lq_sta)
2346 {
2347         struct iwl_scale_tbl_info *tbl;
2348         int rate_idx;
2349         int i;
2350         u32 rate;
2351         u8 use_green = rs_use_green(sta, &priv->current_ht_config);
2352         u8 active_tbl = 0;
2353         u8 valid_tx_ant;
2354
2355         if (!sta || !lq_sta)
2356                 goto out;
2357
2358         i = lq_sta->last_txrate_idx;
2359
2360         if ((lq_sta->lq.sta_id == 0xff) &&
2361             (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2362                 goto out;
2363
2364         valid_tx_ant = priv->hw_params.valid_tx_ant;
2365
2366         if (!lq_sta->search_better_tbl)
2367                 active_tbl = lq_sta->active_tbl;
2368         else
2369                 active_tbl = 1 - lq_sta->active_tbl;
2370
2371         tbl = &(lq_sta->lq_info[active_tbl]);
2372
2373         if ((i < 0) || (i >= IWL_RATE_COUNT))
2374                 i = 0;
2375
2376         rate = iwl_rates[i].plcp;
2377         tbl->ant_type = first_antenna(valid_tx_ant);
2378         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2379
2380         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2381                 rate |= RATE_MCS_CCK_MSK;
2382
2383         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2384         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2385             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2386
2387         rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2388         tbl->current_rate = rate;
2389         rs_set_expected_tpt_table(lq_sta, tbl);
2390         rs_fill_link_cmd(NULL, lq_sta, rate);
2391         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2392  out:
2393         return;
2394 }
2395
2396 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2397                         struct ieee80211_tx_rate_control *txrc)
2398 {
2399
2400         struct sk_buff *skb = txrc->skb;
2401         struct ieee80211_supported_band *sband = txrc->sband;
2402         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2403         struct ieee80211_conf *conf = &priv->hw->conf;
2404         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2405         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2406         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2407         struct iwl_lq_sta *lq_sta = priv_sta;
2408         int rate_idx;
2409
2410         IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2411
2412         /* Get max rate if user set max rate */
2413         if (lq_sta) {
2414                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2415                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2416                     (lq_sta->max_rate_idx != -1))
2417                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2418                 if ((lq_sta->max_rate_idx < 0) ||
2419                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2420                         lq_sta->max_rate_idx = -1;
2421         }
2422
2423         /* Send management frames and NO_ACK data using lowest rate. */
2424         if (rate_control_send_low(sta, priv_sta, txrc))
2425                 return;
2426
2427         rate_idx  = lq_sta->last_txrate_idx;
2428
2429         if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2430             !lq_sta->ibss_sta_added) {
2431                 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2432
2433                 if (sta_id == IWL_INVALID_STATION) {
2434                         IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n",
2435                                        hdr->addr1);
2436                         sta_id = iwl_add_station(priv, hdr->addr1,
2437                                                 false, CMD_ASYNC, ht_cap);
2438                 }
2439                 if ((sta_id != IWL_INVALID_STATION)) {
2440                         lq_sta->lq.sta_id = sta_id;
2441                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2442                         lq_sta->ibss_sta_added = 1;
2443                         rs_initialize_lq(priv, conf, sta, lq_sta);
2444                 }
2445         }
2446
2447         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2448                 rate_idx -= IWL_FIRST_OFDM_RATE;
2449                 /* 6M and 9M shared same MCS index */
2450                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2451                 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2452                     IWL_RATE_MIMO3_6M_PLCP)
2453                         rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2454                 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2455                          IWL_RATE_MIMO2_6M_PLCP)
2456                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2457                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2458                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2459                         info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2460                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2461                         info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2462                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2463                         info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2464                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2465                         info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2466         } else {
2467                 /* Check for invalid rates */
2468                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2469                                 ((sband->band == IEEE80211_BAND_5GHZ) &&
2470                                  (rate_idx < IWL_FIRST_OFDM_RATE)))
2471                         rate_idx = rate_lowest_index(sband, sta);
2472                 /* On valid 5 GHz rate, adjust index */
2473                 else if (sband->band == IEEE80211_BAND_5GHZ)
2474                         rate_idx -= IWL_FIRST_OFDM_RATE;
2475                 info->control.rates[0].flags = 0;
2476         }
2477         info->control.rates[0].idx = rate_idx;
2478
2479 }
2480
2481 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2482                           gfp_t gfp)
2483 {
2484         struct iwl_lq_sta *lq_sta;
2485         struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2486         struct iwl_priv *priv;
2487
2488         priv = (struct iwl_priv *)priv_rate;
2489         IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2490
2491         lq_sta = &sta_priv->lq_sta;
2492
2493         return lq_sta;
2494 }
2495
2496 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2497                          struct ieee80211_sta *sta, void *priv_sta)
2498 {
2499         int i, j;
2500         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2501         struct ieee80211_conf *conf = &priv->hw->conf;
2502         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2503         struct iwl_lq_sta *lq_sta = priv_sta;
2504
2505         lq_sta->lq.sta_id = 0xff;
2506
2507         for (j = 0; j < LQ_SIZE; j++)
2508                 for (i = 0; i < IWL_RATE_COUNT; i++)
2509                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2510
2511         lq_sta->flush_timer = 0;
2512         lq_sta->supp_rates = sta->supp_rates[sband->band];
2513         for (j = 0; j < LQ_SIZE; j++)
2514                 for (i = 0; i < IWL_RATE_COUNT; i++)
2515                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2516
2517         IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init ***\n");
2518         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2519          * the lowest or the highest rate.. Could consider using RSSI from
2520          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2521          * after assoc.. */
2522
2523         lq_sta->ibss_sta_added = 0;
2524         if (priv->iw_mode == NL80211_IFTYPE_AP) {
2525                 u8 sta_id = iwl_find_station(priv,
2526                                                                 sta->addr);
2527
2528                 /* for IBSS the call are from tasklet */
2529                 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
2530
2531                 if (sta_id == IWL_INVALID_STATION) {
2532                         IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
2533                         sta_id = iwl_add_station(priv, sta->addr, false,
2534                                                 CMD_ASYNC, ht_cap);
2535                 }
2536                 if ((sta_id != IWL_INVALID_STATION)) {
2537                         lq_sta->lq.sta_id = sta_id;
2538                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2539                 }
2540                 /* FIXME: this is w/a remove it later */
2541                 priv->assoc_station_added = 1;
2542         }
2543
2544         lq_sta->is_dup = 0;
2545         lq_sta->max_rate_idx = -1;
2546         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2547         lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
2548         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2549         lq_sta->active_rate_basic = priv->active_rate_basic;
2550         lq_sta->band = priv->band;
2551         /*
2552          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2553          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2554          */
2555         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2556         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2557         lq_sta->active_siso_rate &= ~((u16)0x2);
2558         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2559
2560         /* Same here */
2561         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2562         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2563         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2564         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2565
2566         lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2567         lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2568         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2569         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2570
2571         IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2572                      lq_sta->active_siso_rate,
2573                      lq_sta->active_mimo2_rate,
2574                      lq_sta->active_mimo3_rate);
2575
2576         /* These values will be overridden later */
2577         lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2578         lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2579
2580         /* as default allow aggregation for all tids */
2581         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2582         lq_sta->drv = priv;
2583
2584         /* Set last_txrate_idx to lowest rate */
2585         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2586         if (sband->band == IEEE80211_BAND_5GHZ)
2587                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2588         lq_sta->is_agg = 0;
2589
2590         rs_initialize_lq(priv, conf, sta, lq_sta);
2591 }
2592
2593 static void rs_fill_link_cmd(struct iwl_priv *priv,
2594                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2595 {
2596         struct iwl_scale_tbl_info tbl_type;
2597         int index = 0;
2598         int rate_idx;
2599         int repeat_rate = 0;
2600         u8 ant_toggle_cnt = 0;
2601         u8 use_ht_possible = 1;
2602         u8 valid_tx_ant = 0;
2603         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2604
2605         /* Override starting rate (index 0) if needed for debug purposes */
2606         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2607
2608         /* Interpret new_rate (rate_n_flags) */
2609         memset(&tbl_type, 0, sizeof(tbl_type));
2610         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2611                                   &tbl_type, &rate_idx);
2612
2613         /* How many times should we repeat the initial rate? */
2614         if (is_legacy(tbl_type.lq_type)) {
2615                 ant_toggle_cnt = 1;
2616                 repeat_rate = IWL_NUMBER_TRY;
2617         } else {
2618                 repeat_rate = IWL_HT_NUMBER_TRY;
2619         }
2620
2621         lq_cmd->general_params.mimo_delimiter =
2622                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2623
2624         /* Fill 1st table entry (index 0) */
2625         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2626
2627         if (num_of_ant(tbl_type.ant_type) == 1) {
2628                 lq_cmd->general_params.single_stream_ant_msk =
2629                                                 tbl_type.ant_type;
2630         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2631                 lq_cmd->general_params.dual_stream_ant_msk =
2632                                                 tbl_type.ant_type;
2633         } /* otherwise we don't modify the existing value */
2634
2635         index++;
2636         repeat_rate--;
2637
2638         if (priv)
2639                 valid_tx_ant = priv->hw_params.valid_tx_ant;
2640
2641         /* Fill rest of rate table */
2642         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2643                 /* Repeat initial/next rate.
2644                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2645                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2646                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2647                         if (is_legacy(tbl_type.lq_type)) {
2648                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2649                                         ant_toggle_cnt++;
2650                                 else if (priv &&
2651                                          rs_toggle_antenna(valid_tx_ant,
2652                                                         &new_rate, &tbl_type))
2653                                         ant_toggle_cnt = 1;
2654 }
2655
2656                         /* Override next rate if needed for debug purposes */
2657                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2658
2659                         /* Fill next table entry */
2660                         lq_cmd->rs_table[index].rate_n_flags =
2661                                         cpu_to_le32(new_rate);
2662                         repeat_rate--;
2663                         index++;
2664                 }
2665
2666                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2667                                                 &rate_idx);
2668
2669                 /* Indicate to uCode which entries might be MIMO.
2670                  * If initial rate was MIMO, this will finally end up
2671                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2672                 if (is_mimo(tbl_type.lq_type))
2673                         lq_cmd->general_params.mimo_delimiter = index;
2674
2675                 /* Get next rate */
2676                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2677                                              use_ht_possible);
2678
2679                 /* How many times should we repeat the next rate? */
2680                 if (is_legacy(tbl_type.lq_type)) {
2681                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2682                                 ant_toggle_cnt++;
2683                         else if (priv &&
2684                                  rs_toggle_antenna(valid_tx_ant,
2685                                                    &new_rate, &tbl_type))
2686                                 ant_toggle_cnt = 1;
2687
2688                         repeat_rate = IWL_NUMBER_TRY;
2689                 } else {
2690                         repeat_rate = IWL_HT_NUMBER_TRY;
2691                 }
2692
2693                 /* Don't allow HT rates after next pass.
2694                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2695                 use_ht_possible = 0;
2696
2697                 /* Override next rate if needed for debug purposes */
2698                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2699
2700                 /* Fill next table entry */
2701                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2702
2703                 index++;
2704                 repeat_rate--;
2705         }
2706
2707         lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2708         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2709         lq_cmd->agg_params.agg_time_limit =
2710                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2711 }
2712
2713 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2714 {
2715         return hw->priv;
2716 }
2717 /* rate scale requires free function to be implemented */
2718 static void rs_free(void *priv_rate)
2719 {
2720         return;
2721 }
2722
2723 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2724                         void *priv_sta)
2725 {
2726         struct iwl_priv *priv __maybe_unused = priv_r;
2727
2728         IWL_DEBUG_RATE(priv, "enter\n");
2729         IWL_DEBUG_RATE(priv, "leave\n");
2730 }
2731
2732
2733 #ifdef CONFIG_MAC80211_DEBUGFS
2734 static int open_file_generic(struct inode *inode, struct file *file)
2735 {
2736         file->private_data = inode->i_private;
2737         return 0;
2738 }
2739 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2740                              u32 *rate_n_flags, int index)
2741 {
2742         struct iwl_priv *priv;
2743         u8 valid_tx_ant;
2744         u8 ant_sel_tx;
2745
2746         priv = lq_sta->drv;
2747         valid_tx_ant = priv->hw_params.valid_tx_ant;
2748         if (lq_sta->dbg_fixed_rate) {
2749                 ant_sel_tx =
2750                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2751                   >> RATE_MCS_ANT_POS);
2752                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2753                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2754                         IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
2755                 } else {
2756                         lq_sta->dbg_fixed_rate = 0;
2757                         IWL_ERR(priv,
2758                             "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2759                             ant_sel_tx, valid_tx_ant);
2760                         IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2761                 }
2762         } else {
2763                 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2764         }
2765 }
2766
2767 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2768                         const char __user *user_buf, size_t count, loff_t *ppos)
2769 {
2770         struct iwl_lq_sta *lq_sta = file->private_data;
2771         struct iwl_priv *priv;
2772         char buf[64];
2773         int buf_size;
2774         u32 parsed_rate;
2775
2776         priv = lq_sta->drv;
2777         memset(buf, 0, sizeof(buf));
2778         buf_size = min(count, sizeof(buf) -  1);
2779         if (copy_from_user(buf, user_buf, buf_size))
2780                 return -EFAULT;
2781
2782         if (sscanf(buf, "%x", &parsed_rate) == 1)
2783                 lq_sta->dbg_fixed_rate = parsed_rate;
2784         else
2785                 lq_sta->dbg_fixed_rate = 0;
2786
2787         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2788         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2789         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2790         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2791
2792         IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
2793                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2794
2795         if (lq_sta->dbg_fixed_rate) {
2796                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2797                 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2798         }
2799
2800         return count;
2801 }
2802
2803 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2804                         char __user *user_buf, size_t count, loff_t *ppos)
2805 {
2806         char *buff;
2807         int desc = 0;
2808         int i = 0;
2809         int index = 0;
2810         ssize_t ret;
2811
2812         struct iwl_lq_sta *lq_sta = file->private_data;
2813         struct iwl_priv *priv;
2814         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2815
2816         priv = lq_sta->drv;
2817         buff = kmalloc(1024, GFP_KERNEL);
2818         if (!buff)
2819                 return -ENOMEM;
2820
2821         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2822         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2823                         lq_sta->total_failed, lq_sta->total_success,
2824                         lq_sta->active_legacy_rate);
2825         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2826                         lq_sta->dbg_fixed_rate);
2827         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2828             (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2829             (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2830             (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2831         desc += sprintf(buff+desc, "lq type %s\n",
2832            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2833         if (is_Ht(tbl->lq_type)) {
2834                 desc += sprintf(buff+desc, " %s",
2835                    (is_siso(tbl->lq_type)) ? "SISO" :
2836                    ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2837                    desc += sprintf(buff+desc, " %s",
2838                    (tbl->is_ht40) ? "40MHz" : "20MHz");
2839                    desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
2840                    (lq_sta->is_green) ? "GF enabled" : "",
2841                    (lq_sta->is_agg) ? "AGG on" : "");
2842         }
2843         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2844                 lq_sta->last_rate_n_flags);
2845         desc += sprintf(buff+desc, "general:"
2846                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2847                 lq_sta->lq.general_params.flags,
2848                 lq_sta->lq.general_params.mimo_delimiter,
2849                 lq_sta->lq.general_params.single_stream_ant_msk,
2850                 lq_sta->lq.general_params.dual_stream_ant_msk);
2851
2852         desc += sprintf(buff+desc, "agg:"
2853                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2854                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2855                         lq_sta->lq.agg_params.agg_dis_start_th,
2856                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2857
2858         desc += sprintf(buff+desc,
2859                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2860                         lq_sta->lq.general_params.start_rate_index[0],
2861                         lq_sta->lq.general_params.start_rate_index[1],
2862                         lq_sta->lq.general_params.start_rate_index[2],
2863                         lq_sta->lq.general_params.start_rate_index[3]);
2864
2865         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2866                 index = iwl_hwrate_to_plcp_idx(
2867                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2868                 if (is_legacy(tbl->lq_type)) {
2869                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2870                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2871                                 iwl_rate_mcs[index].mbps);
2872                 } else {
2873                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
2874                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2875                                 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
2876                 }
2877         }
2878
2879         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2880         kfree(buff);
2881         return ret;
2882 }
2883
2884 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2885         .write = rs_sta_dbgfs_scale_table_write,
2886         .read = rs_sta_dbgfs_scale_table_read,
2887         .open = open_file_generic,
2888 };
2889 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2890                         char __user *user_buf, size_t count, loff_t *ppos)
2891 {
2892         char *buff;
2893         int desc = 0;
2894         int i, j;
2895         ssize_t ret;
2896
2897         struct iwl_lq_sta *lq_sta = file->private_data;
2898
2899         buff = kmalloc(1024, GFP_KERNEL);
2900         if (!buff)
2901                 return -ENOMEM;
2902
2903         for (i = 0; i < LQ_SIZE; i++) {
2904                 desc += sprintf(buff+desc,
2905                                 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2906                                 "rate=0x%X\n",
2907                                 lq_sta->active_tbl == i ? "*" : "x",
2908                                 lq_sta->lq_info[i].lq_type,
2909                                 lq_sta->lq_info[i].is_SGI,
2910                                 lq_sta->lq_info[i].is_ht40,
2911                                 lq_sta->lq_info[i].is_dup,
2912                                 lq_sta->is_green,
2913                                 lq_sta->lq_info[i].current_rate);
2914                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2915                         desc += sprintf(buff+desc,
2916                                 "counter=%d success=%d %%=%d\n",
2917                                 lq_sta->lq_info[i].win[j].counter,
2918                                 lq_sta->lq_info[i].win[j].success_counter,
2919                                 lq_sta->lq_info[i].win[j].success_ratio);
2920                 }
2921         }
2922         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2923         kfree(buff);
2924         return ret;
2925 }
2926
2927 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2928         .read = rs_sta_dbgfs_stats_table_read,
2929         .open = open_file_generic,
2930 };
2931
2932 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2933                         char __user *user_buf, size_t count, loff_t *ppos)
2934 {
2935         char buff[120];
2936         int desc = 0;
2937         ssize_t ret;
2938
2939         struct iwl_lq_sta *lq_sta = file->private_data;
2940         struct iwl_priv *priv;
2941         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2942
2943         priv = lq_sta->drv;
2944
2945         if (is_Ht(tbl->lq_type))
2946                 desc += sprintf(buff+desc,
2947                                 "Bit Rate= %d Mb/s\n",
2948                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
2949         else
2950                 desc += sprintf(buff+desc,
2951                                 "Bit Rate= %d Mb/s\n",
2952                                 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
2953         desc += sprintf(buff+desc,
2954                         "Signal Level= %d dBm\tNoise Level= %d dBm\n",
2955                         priv->last_rx_rssi, priv->last_rx_noise);
2956         desc += sprintf(buff+desc,
2957                         "Tsf= 0x%llx\tBeacon time= 0x%08X\n",
2958                         priv->last_tsf, priv->last_beacon_time);
2959
2960         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2961         return ret;
2962 }
2963
2964 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2965         .read = rs_sta_dbgfs_rate_scale_data_read,
2966         .open = open_file_generic,
2967 };
2968
2969 static void rs_add_debugfs(void *priv, void *priv_sta,
2970                                         struct dentry *dir)
2971 {
2972         struct iwl_lq_sta *lq_sta = priv_sta;
2973         lq_sta->rs_sta_dbgfs_scale_table_file =
2974                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2975                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2976         lq_sta->rs_sta_dbgfs_stats_table_file =
2977                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2978                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2979         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
2980                 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
2981                         lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
2982         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2983                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2984                 &lq_sta->tx_agg_tid_en);
2985
2986 }
2987
2988 static void rs_remove_debugfs(void *priv, void *priv_sta)
2989 {
2990         struct iwl_lq_sta *lq_sta = priv_sta;
2991         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2992         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2993         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
2994         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2995 }
2996 #endif
2997
2998 static struct rate_control_ops rs_ops = {
2999         .module = NULL,
3000         .name = RS_NAME,
3001         .tx_status = rs_tx_status,
3002         .get_rate = rs_get_rate,
3003         .rate_init = rs_rate_init,
3004         .alloc = rs_alloc,
3005         .free = rs_free,
3006         .alloc_sta = rs_alloc_sta,
3007         .free_sta = rs_free_sta,
3008 #ifdef CONFIG_MAC80211_DEBUGFS
3009         .add_sta_debugfs = rs_add_debugfs,
3010         .remove_sta_debugfs = rs_remove_debugfs,
3011 #endif
3012 };
3013
3014 int iwlagn_rate_control_register(void)
3015 {
3016         return ieee80211_rate_control_register(&rs_ops);
3017 }
3018
3019 void iwlagn_rate_control_unregister(void)
3020 {
3021         ieee80211_rate_control_unregister(&rs_ops);
3022 }
3023