SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/net/wireless/iwlwifi/iwl-agn-rs.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2008 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  * James P. Ketrenos <ipw2100-admin@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/wireless.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37
  38 #include "../net/mac80211/rate.h"
  39
  40 #include "iwl-dev.h"
  41 #include "iwl-sta.h"
  42 #include "iwl-core.h"
  43 #include "iwl-helpers.h"
  44
  45 #define RS_NAME "iwl-agn-rs"
  46
  47 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  48 #define IWL_NUMBER_TRY      1
  49 #define IWL_HT_NUMBER_TRY   3
  50
  51 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  52 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  53 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  54
  55 /* max time to accum history 2 seconds */
  56 #define IWL_RATE_SCALE_FLUSH_INTVL   (2*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 /**
  80  * struct iwl_rate_scale_data -- tx success history for one rate
  81  */
  82 struct iwl_rate_scale_data {
  83         u64 data;               /* bitmap of successful frames */
  84         s32 success_counter;    /* number of frames successful */
  85         s32 success_ratio;      /* per-cent * 128  */
  86         s32 counter;            /* number of frames attempted */
  87         s32 average_tpt;        /* success ratio * expected throughput */
  88         unsigned long stamp;
  89 };
  90
  91 /**
  92  * struct iwl_scale_tbl_info -- tx params and success history for all rates
  93  *
  94  * There are two of these in struct iwl_lq_sta,
  95  * one for "active", and one for "search".
  96  */
  97 struct iwl_scale_tbl_info {
  98         enum iwl_table_type lq_type;
  99         u8 ant_type;
 100         u8 is_SGI;      /* 1 = short guard interval */
 101         u8 is_fat;      /* 1 = 40 MHz channel width */
 102         u8 is_dup;      /* 1 = duplicated data streams */
 103         u8 action;      /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
 104         s32 *expected_tpt;      /* throughput metrics; expected_tpt_G, etc. */
 105         u32 current_rate;  /* rate_n_flags, uCode API format */
 106         struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
 107 };
 108
 109 struct iwl_traffic_load {
 110         unsigned long time_stamp;       /* age of the oldest statistics */
 111         u32 packet_count[TID_QUEUE_MAX_SIZE];   /* packet count in this time
 112                                                  * slice */
 113         u32 total;                      /* total num of packets during the
 114                                          * last TID_MAX_TIME_DIFF */
 115         u8 queue_count;                 /* number of queues that has
 116                                          * been used since the last cleanup */
 117         u8 head;                        /* start of the circular buffer */
 118 };
 119
 120 /**
 121  * struct iwl_lq_sta -- driver's rate scaling private structure
 122  *
 123  * Pointer to this gets passed back and forth between driver and mac80211.
 124  */
 125 struct iwl_lq_sta {
 126         u8 active_tbl;          /* index of active table, range 0-1 */
 127         u8 enable_counter;      /* indicates HT mode */
 128         u8 stay_in_tbl;         /* 1: disallow, 0: allow search for new mode */
 129         u8 search_better_tbl;   /* 1: currently trying alternate mode */
 130         s32 last_tpt;
 131
 132         /* The following determine when to search for a new mode */
 133         u32 table_count_limit;
 134         u32 max_failure_limit;  /* # failed frames before new search */
 135         u32 max_success_limit;  /* # successful frames before new search */
 136         u32 table_count;
 137         u32 total_failed;       /* total failed frames, any/all rates */
 138         u32 total_success;      /* total successful frames, any/all rates */
 139         u32 flush_timer;        /* time staying in mode before new search */
 140
 141         u8 action_counter;      /* # mode-switch actions tried */
 142         u8 is_green;
 143         u8 is_dup;
 144         enum ieee80211_band band;
 145         u8 ibss_sta_added;
 146
 147         /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
 148         u32 supp_rates;
 149         u16 active_legacy_rate;
 150         u16 active_siso_rate;
 151         u16 active_mimo2_rate;
 152         u16 active_mimo3_rate;
 153         u16 active_rate_basic;
 154
 155         struct iwl_link_quality_cmd lq;
 156         struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
 157         struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
 158         u8 tx_agg_tid_en;
 159 #ifdef CONFIG_MAC80211_DEBUGFS
 160         struct dentry *rs_sta_dbgfs_scale_table_file;
 161         struct dentry *rs_sta_dbgfs_stats_table_file;
 162         struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
 163         u32 dbg_fixed_rate;
 164 #endif
 165         struct iwl_priv *drv;
 166
 167         /* used to be in sta_info */
 168         int last_txrate_idx;
 169 };
 170
 171 static void rs_rate_scale_perform(struct iwl_priv *priv,
 172                                    struct net_device *dev,
 173                                    struct ieee80211_hdr *hdr,
 174                                    struct sta_info *sta);
 175 static void rs_fill_link_cmd(const struct iwl_priv *priv,
 176                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 177
 178
 179 #ifdef CONFIG_MAC80211_DEBUGFS
 180 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 181                              u32 *rate_n_flags, int index);
 182 #else
 183 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 184                              u32 *rate_n_flags, int index)
 185 {}
 186 #endif
 187
 188 /*
 189  * Expected throughput metrics for following rates:
 190  * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 191  * "G" is the only table that supports CCK (the first 4 rates).
 192  */
 193 /*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/
 194 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
 195         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
 196 };
 197
 198 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
 199         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
 200 };
 201
 202 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
 203         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
 204 };
 205
 206 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
 207         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
 208 };
 209
 210 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
 211         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
 212 };
 213
 214 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
 215         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
 216 };
 217
 218 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
 219         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
 220 };
 221
 222 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
 223         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
 224 };
 225
 226 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
 227         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
 228 };
 229
 230 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
 231         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
 232 };
 233
 234 static inline u8 rs_extract_rate(u32 rate_n_flags)
 235 {
 236         return (u8)(rate_n_flags & 0xFF);
 237 }
 238
 239 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 240 {
 241         window->data = 0;
 242         window->success_counter = 0;
 243         window->success_ratio = IWL_INVALID_VALUE;
 244         window->counter = 0;
 245         window->average_tpt = IWL_INVALID_VALUE;
 246         window->stamp = 0;
 247 }
 248
 249 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 250 {
 251         return (ant_type & valid_antenna) == ant_type;
 252 }
 253
 254 /*
 255  *      removes the old data from the statistics. All data that is older than
 256  *      TID_MAX_TIME_DIFF, will be deleted.
 257  */
 258 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 259 {
 260         /* The oldest age we want to keep */
 261         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 262
 263         while (tl->queue_count &&
 264                (tl->time_stamp < oldest_time)) {
 265                 tl->total -= tl->packet_count[tl->head];
 266                 tl->packet_count[tl->head] = 0;
 267                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 268                 tl->queue_count--;
 269                 tl->head++;
 270                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 271                         tl->head = 0;
 272         }
 273 }
 274
 275 /*
 276  *      increment traffic load value for tid and also remove
 277  *      any old values if passed the certain time period
 278  */
 279 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 280                            struct ieee80211_hdr *hdr)
 281 {
 282         u32 curr_time = jiffies_to_msecs(jiffies);
 283         u32 time_diff;
 284         s32 index;
 285         struct iwl_traffic_load *tl = NULL;
 286         __le16 fc = hdr->frame_control;
 287         u8 tid;
 288
 289         if (ieee80211_is_data_qos(fc)) {
 290                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 291                 tid = qc[0] & 0xf;
 292         } else
 293                 return MAX_TID_COUNT;
 294
 295         tl = &lq_data->load[tid];
 296
 297         curr_time -= curr_time % TID_ROUND_VALUE;
 298
 299         /* Happens only for the first packet. Initialize the data */
 300         if (!(tl->queue_count)) {
 301                 tl->total = 1;
 302                 tl->time_stamp = curr_time;
 303                 tl->queue_count = 1;
 304                 tl->head = 0;
 305                 tl->packet_count[0] = 1;
 306                 return MAX_TID_COUNT;
 307         }
 308
 309         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 310         index = time_diff / TID_QUEUE_CELL_SPACING;
 311
 312         /* The history is too long: remove data that is older than */
 313         /* TID_MAX_TIME_DIFF */
 314         if (index >= TID_QUEUE_MAX_SIZE)
 315                 rs_tl_rm_old_stats(tl, curr_time);
 316
 317         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 318         tl->packet_count[index] = tl->packet_count[index] + 1;
 319         tl->total = tl->total + 1;
 320
 321         if ((index + 1) > tl->queue_count)
 322                 tl->queue_count = index + 1;
 323
 324         return tid;
 325 }
 326
 327 /*
 328         get the traffic load value for tid
 329 */
 330 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 331 {
 332         u32 curr_time = jiffies_to_msecs(jiffies);
 333         u32 time_diff;
 334         s32 index;
 335         struct iwl_traffic_load *tl = NULL;
 336
 337         if (tid >= TID_MAX_LOAD_COUNT)
 338                 return 0;
 339
 340         tl = &(lq_data->load[tid]);
 341
 342         curr_time -= curr_time % TID_ROUND_VALUE;
 343
 344         if (!(tl->queue_count))
 345                 return 0;
 346
 347         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 348         index = time_diff / TID_QUEUE_CELL_SPACING;
 349
 350         /* The history is too long: remove data that is older than */
 351         /* TID_MAX_TIME_DIFF */
 352         if (index >= TID_QUEUE_MAX_SIZE)
 353                 rs_tl_rm_old_stats(tl, curr_time);
 354
 355         return tl->total;
 356 }
 357
 358 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 359                                       struct iwl_lq_sta *lq_data, u8 tid,
 360                                       struct sta_info *sta)
 361 {
 362         DECLARE_MAC_BUF(mac);
 363
 364         if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
 365                 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
 366                                 print_mac(mac, sta->sta.addr), tid);
 367                 ieee80211_start_tx_ba_session(priv->hw, sta->sta.addr, tid);
 368         }
 369 }
 370
 371 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 372                               struct iwl_lq_sta *lq_data,
 373                               struct sta_info *sta)
 374 {
 375         if ((tid < TID_MAX_LOAD_COUNT))
 376                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 377         else if (tid == IWL_AGG_ALL_TID)
 378                 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
 379                         rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 380 }
 381
 382 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 383 {
 384         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 385                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 386                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 387 }
 388
 389 /**
 390  * rs_collect_tx_data - Update the success/failure sliding window
 391  *
 392  * We keep a sliding window of the last 62 packets transmitted
 393  * at this rate.  window->data contains the bitmask of successful
 394  * packets.
 395  */
 396 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
 397                               int scale_index, s32 tpt, int retries,
 398                               int successes)
 399 {
 400         struct iwl_rate_scale_data *window = NULL;
 401         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 402         s32 fail_count;
 403
 404         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 405                 return -EINVAL;
 406
 407         /* Select data for current tx bit rate */
 408         window = &(windows[scale_index]);
 409
 410         /*
 411          * Keep track of only the latest 62 tx frame attempts in this rate's
 412          * history window; anything older isn't really relevant any more.
 413          * If we have filled up the sliding window, drop the oldest attempt;
 414          * if the oldest attempt (highest bit in bitmap) shows "success",
 415          * subtract "1" from the success counter (this is the main reason
 416          * we keep these bitmaps!).
 417          */
 418         while (retries > 0) {
 419                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 420
 421                         /* remove earliest */
 422                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 423
 424                         if (window->data & mask) {
 425                                 window->data &= ~mask;
 426                                 window->success_counter--;
 427                         }
 428                 }
 429
 430                 /* Increment frames-attempted counter */
 431                 window->counter++;
 432
 433                 /* Shift bitmap by one frame (throw away oldest history),
 434                  * OR in "1", and increment "success" if this
 435                  * frame was successful. */
 436                 window->data <<= 1;
 437                 if (successes > 0) {
 438                         window->success_counter++;
 439                         window->data |= 0x1;
 440                         successes--;
 441                 }
 442
 443                 retries--;
 444         }
 445
 446         /* Calculate current success ratio, avoid divide-by-0! */
 447         if (window->counter > 0)
 448                 window->success_ratio = 128 * (100 * window->success_counter)
 449                                         / window->counter;
 450         else
 451                 window->success_ratio = IWL_INVALID_VALUE;
 452
 453         fail_count = window->counter - window->success_counter;
 454
 455         /* Calculate average throughput, if we have enough history. */
 456         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 457             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 458                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 459         else
 460                 window->average_tpt = IWL_INVALID_VALUE;
 461
 462         /* Tag this window as having been updated */
 463         window->stamp = jiffies;
 464
 465         return 0;
 466 }
 467
 468 /*
 469  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 470  */
 471 /* FIXME:RS:remove this function and put the flags statically in the table */
 472 static u32 rate_n_flags_from_tbl(struct iwl_scale_tbl_info *tbl,
 473                                        int index, u8 use_green)
 474 {
 475         u32 rate_n_flags = 0;
 476
 477         if (is_legacy(tbl->lq_type)) {
 478                 rate_n_flags = iwl_rates[index].plcp;
 479                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 480                         rate_n_flags |= RATE_MCS_CCK_MSK;
 481
 482         } else if (is_Ht(tbl->lq_type)) {
 483                 if (index > IWL_LAST_OFDM_RATE) {
 484                         IWL_ERROR("invalid HT rate index %d\n", index);
 485                         index = IWL_LAST_OFDM_RATE;
 486                 }
 487                 rate_n_flags = RATE_MCS_HT_MSK;
 488
 489                 if (is_siso(tbl->lq_type))
 490                         rate_n_flags |= iwl_rates[index].plcp_siso;
 491                 else if (is_mimo2(tbl->lq_type))
 492                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 493                 else
 494                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 495         } else {
 496                 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
 497         }
 498
 499         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 500                                                      RATE_MCS_ANT_ABC_MSK);
 501
 502         if (is_Ht(tbl->lq_type)) {
 503                 if (tbl->is_fat) {
 504                         if (tbl->is_dup)
 505                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 506                         else
 507                                 rate_n_flags |= RATE_MCS_FAT_MSK;
 508                 }
 509                 if (tbl->is_SGI)
 510                         rate_n_flags |= RATE_MCS_SGI_MSK;
 511
 512                 if (use_green) {
 513                         rate_n_flags |= RATE_MCS_GF_MSK;
 514                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 515                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 516                                 IWL_ERROR("GF was set with SGI:SISO\n");
 517                         }
 518                 }
 519         }
 520         return rate_n_flags;
 521 }
 522
 523 /*
 524  * Interpret uCode API's rate_n_flags format,
 525  * fill "search" or "active" tx mode table.
 526  */
 527 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 528                                     enum ieee80211_band band,
 529                                     struct iwl_scale_tbl_info *tbl,
 530                                     int *rate_idx)
 531 {
 532         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 533         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 534         u8 mcs;
 535
 536         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 537
 538         if (*rate_idx  == IWL_RATE_INVALID) {
 539                 *rate_idx = -1;
 540                 return -EINVAL;
 541         }
 542         tbl->is_SGI = 0;        /* default legacy setup */
 543         tbl->is_fat = 0;
 544         tbl->is_dup = 0;
 545         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 546         tbl->lq_type = LQ_NONE;
 547
 548         /* legacy rate format */
 549         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 550                 if (num_of_ant == 1) {
 551                         if (band == IEEE80211_BAND_5GHZ)
 552                                 tbl->lq_type = LQ_A;
 553                         else
 554                                 tbl->lq_type = LQ_G;
 555                 }
 556         /* HT rate format */
 557         } else {
 558                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 559                         tbl->is_SGI = 1;
 560
 561                 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
 562                     (rate_n_flags & RATE_MCS_DUP_MSK))
 563                         tbl->is_fat = 1;
 564
 565                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 566                         tbl->is_dup = 1;
 567
 568                 mcs = rs_extract_rate(rate_n_flags);
 569
 570                 /* SISO */
 571                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 572                         if (num_of_ant == 1)
 573                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 574                 /* MIMO2 */
 575                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 576                         if (num_of_ant == 2)
 577                                 tbl->lq_type = LQ_MIMO2;
 578                 /* MIMO3 */
 579                 } else {
 580                         if (num_of_ant == 3)
 581                                 tbl->lq_type = LQ_MIMO3;
 582                 }
 583         }
 584         return 0;
 585 }
 586
 587 /* switch to another antenna/antennas and return 1 */
 588 /* if no other valid antenna found, return 0 */
 589 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 590                              struct iwl_scale_tbl_info *tbl)
 591 {
 592         u8 new_ant_type;
 593
 594         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 595                 return 0;
 596
 597         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 598                 return 0;
 599
 600         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 601
 602         while ((new_ant_type != tbl->ant_type) &&
 603                !rs_is_valid_ant(valid_ant, new_ant_type))
 604                 new_ant_type = ant_toggle_lookup[new_ant_type];
 605
 606         if (new_ant_type == tbl->ant_type)
 607                 return 0;
 608
 609         tbl->ant_type = new_ant_type;
 610         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 611         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 612         return 1;
 613 }
 614
 615 /* FIXME:RS: in 4965 we don't use greenfield at all */
 616 /* FIXME:RS: don't use greenfield for now in TX */
 617 #if 0
 618 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
 619 {
 620         return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
 621                 priv->current_ht_config.is_green_field &&
 622                 !priv->current_ht_config.non_GF_STA_present;
 623 }
 624 #endif
 625 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
 626 {
 627         return 0;
 628 }
 629
 630 /**
 631  * rs_get_supported_rates - get the available rates
 632  *
 633  * if management frame or broadcast frame only return
 634  * basic available rates.
 635  *
 636  */
 637 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 638                                   struct ieee80211_hdr *hdr,
 639                                   enum iwl_table_type rate_type)
 640 {
 641         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
 642             lq_sta->active_rate_basic)
 643                 return lq_sta->active_rate_basic;
 644
 645         if (is_legacy(rate_type)) {
 646                 return lq_sta->active_legacy_rate;
 647         } else {
 648                 if (is_siso(rate_type))
 649                         return lq_sta->active_siso_rate;
 650                 else if (is_mimo2(rate_type))
 651                         return lq_sta->active_mimo2_rate;
 652                 else
 653                         return lq_sta->active_mimo3_rate;
 654         }
 655 }
 656
 657 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 658                                 int rate_type)
 659 {
 660         u8 high = IWL_RATE_INVALID;
 661         u8 low = IWL_RATE_INVALID;
 662
 663         /* 802.11A or ht walks to the next literal adjacent rate in
 664          * the rate table */
 665         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 666                 int i;
 667                 u32 mask;
 668
 669                 /* Find the previous rate that is in the rate mask */
 670                 i = index - 1;
 671                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 672                         if (rate_mask & mask) {
 673                                 low = i;
 674                                 break;
 675                         }
 676                 }
 677
 678                 /* Find the next rate that is in the rate mask */
 679                 i = index + 1;
 680                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 681                         if (rate_mask & mask) {
 682                                 high = i;
 683                                 break;
 684                         }
 685                 }
 686
 687                 return (high << 8) | low;
 688         }
 689
 690         low = index;
 691         while (low != IWL_RATE_INVALID) {
 692                 low = iwl_rates[low].prev_rs;
 693                 if (low == IWL_RATE_INVALID)
 694                         break;
 695                 if (rate_mask & (1 << low))
 696                         break;
 697                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
 698         }
 699
 700         high = index;
 701         while (high != IWL_RATE_INVALID) {
 702                 high = iwl_rates[high].next_rs;
 703                 if (high == IWL_RATE_INVALID)
 704                         break;
 705                 if (rate_mask & (1 << high))
 706                         break;
 707                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
 708         }
 709
 710         return (high << 8) | low;
 711 }
 712
 713 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 714                              struct iwl_scale_tbl_info *tbl,
 715                              u8 scale_index, u8 ht_possible)
 716 {
 717         s32 low;
 718         u16 rate_mask;
 719         u16 high_low;
 720         u8 switch_to_legacy = 0;
 721         u8 is_green = lq_sta->is_green;
 722
 723         /* check if we need to switch from HT to legacy rates.
 724          * assumption is that mandatory rates (1Mbps or 6Mbps)
 725          * are always supported (spec demand) */
 726         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 727                 switch_to_legacy = 1;
 728                 scale_index = rs_ht_to_legacy[scale_index];
 729                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 730                         tbl->lq_type = LQ_A;
 731                 else
 732                         tbl->lq_type = LQ_G;
 733
 734                 if (num_of_ant(tbl->ant_type) > 1)
 735                         tbl->ant_type = ANT_A;/*FIXME:RS*/
 736
 737                 tbl->is_fat = 0;
 738                 tbl->is_SGI = 0;
 739         }
 740
 741         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 742
 743         /* Mask with station rate restriction */
 744         if (is_legacy(tbl->lq_type)) {
 745                 /* supp_rates has no CCK bits in A mode */
 746                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 747                         rate_mask  = (u16)(rate_mask &
 748                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 749                 else
 750                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 751         }
 752
 753         /* If we switched from HT to legacy, check current rate */
 754         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 755                 low = scale_index;
 756                 goto out;
 757         }
 758
 759         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 760                                         tbl->lq_type);
 761         low = high_low & 0xff;
 762
 763         if (low == IWL_RATE_INVALID)
 764                 low = scale_index;
 765
 766 out:
 767         return rate_n_flags_from_tbl(tbl, low, is_green);
 768 }
 769
 770 /*
 771  * mac80211 sends us Tx status
 772  */
 773 static void rs_tx_status(void *priv_rate, struct net_device *dev,
 774                          struct sk_buff *skb)
 775 {
 776         int status;
 777         u8 retries;
 778         int rs_index, index = 0;
 779         struct iwl_lq_sta *lq_sta;
 780         struct iwl_link_quality_cmd *table;
 781         struct sta_info *sta;
 782         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 783         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
 784         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 785         struct ieee80211_hw *hw = local_to_hw(local);
 786         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 787         struct iwl_rate_scale_data *window = NULL;
 788         struct iwl_rate_scale_data *search_win = NULL;
 789         u32 tx_rate;
 790         struct iwl_scale_tbl_info tbl_type;
 791         struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
 792         u8 active_index = 0;
 793         __le16 fc = hdr->frame_control;
 794         s32 tpt = 0;
 795
 796         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
 797
 798         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
 799                 return;
 800
 801         /* This packet was aggregated but doesn't carry rate scale info */
 802         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 803             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 804                 return;
 805
 806         retries = info->status.retry_count;
 807
 808         if (retries > 15)
 809                 retries = 15;
 810
 811         rcu_read_lock();
 812
 813         sta = sta_info_get(local, hdr->addr1);
 814
 815         if (!sta || !sta->rate_ctrl_priv)
 816                 goto out;
 817
 818
 819         lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv;
 820
 821         if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
 822             !lq_sta->ibss_sta_added)
 823                 goto out;
 824
 825         table = &lq_sta->lq;
 826         active_index = lq_sta->active_tbl;
 827
 828         curr_tbl = &(lq_sta->lq_info[active_index]);
 829         search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
 830         window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
 831         search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
 832
 833         /*
 834          * Ignore this Tx frame response if its initial rate doesn't match
 835          * that of latest Link Quality command.  There may be stragglers
 836          * from a previous Link Quality command, but we're no longer interested
 837          * in those; they're either from the "active" mode while we're trying
 838          * to check "search" mode, or a prior "search" mode after we've moved
 839          * to a new "search" mode (which might become the new "active" mode).
 840          */
 841         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 842         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 843         if (priv->band == IEEE80211_BAND_5GHZ)
 844                 rs_index -= IWL_FIRST_OFDM_RATE;
 845
 846         if ((info->tx_rate_idx < 0) ||
 847             (tbl_type.is_SGI ^
 848                 !!(info->flags & IEEE80211_TX_CTL_SHORT_GI)) ||
 849             (tbl_type.is_fat ^
 850                 !!(info->flags & IEEE80211_TX_CTL_40_MHZ_WIDTH)) ||
 851             (tbl_type.is_dup ^
 852                 !!(info->flags & IEEE80211_TX_CTL_DUP_DATA)) ||
 853             (tbl_type.ant_type ^ info->antenna_sel_tx) ||
 854             (!!(tx_rate & RATE_MCS_HT_MSK) ^
 855                 !!(info->flags & IEEE80211_TX_CTL_OFDM_HT)) ||
 856             (!!(tx_rate & RATE_MCS_GF_MSK) ^
 857                 !!(info->flags & IEEE80211_TX_CTL_GREEN_FIELD)) ||
 858             (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
 859              hw->wiphy->bands[info->band]->bitrates[info->tx_rate_idx].bitrate)) {
 860                 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
 861                 goto out;
 862         }
 863
 864         /* Update frame history window with "failure" for each Tx retry. */
 865         while (retries) {
 866                 /* Look up the rate and other info used for each tx attempt.
 867                  * Each tx attempt steps one entry deeper in the rate table. */
 868                 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 869                 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
 870                                           &tbl_type, &rs_index);
 871
 872                 /* If type matches "search" table,
 873                  * add failure to "search" history */
 874                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 875                     (tbl_type.ant_type == search_tbl->ant_type) &&
 876                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 877                         if (search_tbl->expected_tpt)
 878                                 tpt = search_tbl->expected_tpt[rs_index];
 879                         else
 880                                 tpt = 0;
 881                         rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
 882
 883                 /* Else if type matches "current/active" table,
 884                  * add failure to "current/active" history */
 885                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 886                            (tbl_type.ant_type == curr_tbl->ant_type) &&
 887                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 888                         if (curr_tbl->expected_tpt)
 889                                 tpt = curr_tbl->expected_tpt[rs_index];
 890                         else
 891                                 tpt = 0;
 892                         rs_collect_tx_data(window, rs_index, tpt, 1, 0);
 893                 }
 894
 895                 /* If not searching for a new mode, increment failed counter
 896                  * ... this helps determine when to start searching again */
 897                 if (lq_sta->stay_in_tbl)
 898                         lq_sta->total_failed++;
 899                 --retries;
 900                 index++;
 901
 902         }
 903
 904         /*
 905          * Find (by rate) the history window to update with final Tx attempt;
 906          * if Tx was successful first try, use original rate,
 907          * else look up the rate that was, finally, successful.
 908          */
 909         tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 910         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 911
 912         /* Update frame history window with "success" if Tx got ACKed ... */
 913         status = !!(info->flags & IEEE80211_TX_STAT_ACK);
 914
 915         /* If type matches "search" table,
 916          * add final tx status to "search" history */
 917         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 918             (tbl_type.ant_type == search_tbl->ant_type) &&
 919             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 920                 if (search_tbl->expected_tpt)
 921                         tpt = search_tbl->expected_tpt[rs_index];
 922                 else
 923                         tpt = 0;
 924                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 925                         rs_collect_tx_data(search_win, rs_index, tpt,
 926                                            info->status.ampdu_ack_len,
 927                                            info->status.ampdu_ack_map);
 928                 else
 929                         rs_collect_tx_data(search_win, rs_index, tpt,
 930                                            1, status);
 931         /* Else if type matches "current/active" table,
 932          * add final tx status to "current/active" history */
 933         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 934                    (tbl_type.ant_type == curr_tbl->ant_type) &&
 935                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 936                 if (curr_tbl->expected_tpt)
 937                         tpt = curr_tbl->expected_tpt[rs_index];
 938                 else
 939                         tpt = 0;
 940                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 941                         rs_collect_tx_data(window, rs_index, tpt,
 942                                            info->status.ampdu_ack_len,
 943                                            info->status.ampdu_ack_map);
 944                 else
 945                         rs_collect_tx_data(window, rs_index, tpt,
 946                                            1, status);
 947         }
 948
 949         /* If not searching for new mode, increment success/failed counter
 950          * ... these help determine when to start searching again */
 951         if (lq_sta->stay_in_tbl) {
 952                 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
 953                         lq_sta->total_success += info->status.ampdu_ack_map;
 954                         lq_sta->total_failed +=
 955                              (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
 956                 } else {
 957                         if (status)
 958                                 lq_sta->total_success++;
 959                         else
 960                                 lq_sta->total_failed++;
 961                 }
 962         }
 963
 964         /* See if there's a better rate or modulation mode to try. */
 965         rs_rate_scale_perform(priv, dev, hdr, sta);
 966 out:
 967         rcu_read_unlock();
 968         return;
 969 }
 970
 971 /*
 972  * Begin a period of staying with a selected modulation mode.
 973  * Set "stay_in_tbl" flag to prevent any mode switches.
 974  * Set frame tx success limits according to legacy vs. high-throughput,
 975  * and reset overall (spanning all rates) tx success history statistics.
 976  * These control how long we stay using same modulation mode before
 977  * searching for a new mode.
 978  */
 979 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
 980                                  struct iwl_lq_sta *lq_sta)
 981 {
 982         IWL_DEBUG_RATE("we are staying in the same table\n");
 983         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
 984         if (is_legacy) {
 985                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
 986                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
 987                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
 988         } else {
 989                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
 990                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
 991                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
 992         }
 993         lq_sta->table_count = 0;
 994         lq_sta->total_failed = 0;
 995         lq_sta->total_success = 0;
 996 }
 997
 998 /*
 999  * Find correct throughput table for given mode of modulation
1000  */
1001 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1002                                       struct iwl_scale_tbl_info *tbl)
1003 {
1004         if (is_legacy(tbl->lq_type)) {
1005                 if (!is_a_band(tbl->lq_type))
1006                         tbl->expected_tpt = expected_tpt_G;
1007                 else
1008                         tbl->expected_tpt = expected_tpt_A;
1009         } else if (is_siso(tbl->lq_type)) {
1010                 if (tbl->is_fat && !lq_sta->is_dup)
1011                         if (tbl->is_SGI)
1012                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1013                         else
1014                                 tbl->expected_tpt = expected_tpt_siso40MHz;
1015                 else if (tbl->is_SGI)
1016                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1017                 else
1018                         tbl->expected_tpt = expected_tpt_siso20MHz;
1019
1020         } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1021                 if (tbl->is_fat && !lq_sta->is_dup)
1022                         if (tbl->is_SGI)
1023                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1024                         else
1025                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
1026                 else if (tbl->is_SGI)
1027                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1028                 else
1029                         tbl->expected_tpt = expected_tpt_mimo20MHz;
1030         } else
1031                 tbl->expected_tpt = expected_tpt_G;
1032 }
1033
1034 /*
1035  * Find starting rate for new "search" high-throughput mode of modulation.
1036  * Goal is to find lowest expected rate (under perfect conditions) that is
1037  * above the current measured throughput of "active" mode, to give new mode
1038  * a fair chance to prove itself without too many challenges.
1039  *
1040  * This gets called when transitioning to more aggressive modulation
1041  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1042  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1043  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1044  * bit rate will typically need to increase, but not if performance was bad.
1045  */
1046 static s32 rs_get_best_rate(struct iwl_priv *priv,
1047                             struct iwl_lq_sta *lq_sta,
1048                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1049                             u16 rate_mask, s8 index)
1050 {
1051         /* "active" values */
1052         struct iwl_scale_tbl_info *active_tbl =
1053             &(lq_sta->lq_info[lq_sta->active_tbl]);
1054         s32 active_sr = active_tbl->win[index].success_ratio;
1055         s32 active_tpt = active_tbl->expected_tpt[index];
1056
1057         /* expected "search" throughput */
1058         s32 *tpt_tbl = tbl->expected_tpt;
1059
1060         s32 new_rate, high, low, start_hi;
1061         u16 high_low;
1062         s8 rate = index;
1063
1064         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1065
1066         for (; ;) {
1067                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1068                                                 tbl->lq_type);
1069
1070                 low = high_low & 0xff;
1071                 high = (high_low >> 8) & 0xff;
1072
1073                 /*
1074                  * Lower the "search" bit rate, to give new "search" mode
1075                  * approximately the same throughput as "active" if:
1076                  *
1077                  * 1) "Active" mode has been working modestly well (but not
1078                  *    great), and expected "search" throughput (under perfect
1079                  *    conditions) at candidate rate is above the actual
1080                  *    measured "active" throughput (but less than expected
1081                  *    "active" throughput under perfect conditions).
1082                  * OR
1083                  * 2) "Active" mode has been working perfectly or very well
1084                  *    and expected "search" throughput (under perfect
1085                  *    conditions) at candidate rate is above expected
1086                  *    "active" throughput (under perfect conditions).
1087                  */
1088                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1089                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1090                       (active_sr <= IWL_RATE_HIGH_TH) &&
1091                       (tpt_tbl[rate] <= active_tpt))) ||
1092                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1093                      (tpt_tbl[rate] > active_tpt))) {
1094
1095                         /* (2nd or later pass)
1096                          * If we've already tried to raise the rate, and are
1097                          * now trying to lower it, use the higher rate. */
1098                         if (start_hi != IWL_RATE_INVALID) {
1099                                 new_rate = start_hi;
1100                                 break;
1101                         }
1102
1103                         new_rate = rate;
1104
1105                         /* Loop again with lower rate */
1106                         if (low != IWL_RATE_INVALID)
1107                                 rate = low;
1108
1109                         /* Lower rate not available, use the original */
1110                         else
1111                                 break;
1112
1113                 /* Else try to raise the "search" rate to match "active" */
1114                 } else {
1115                         /* (2nd or later pass)
1116                          * If we've already tried to lower the rate, and are
1117                          * now trying to raise it, use the lower rate. */
1118                         if (new_rate != IWL_RATE_INVALID)
1119                                 break;
1120
1121                         /* Loop again with higher rate */
1122                         else if (high != IWL_RATE_INVALID) {
1123                                 start_hi = high;
1124                                 rate = high;
1125
1126                         /* Higher rate not available, use the original */
1127                         } else {
1128                                 new_rate = rate;
1129                                 break;
1130                         }
1131                 }
1132         }
1133
1134         return new_rate;
1135 }
1136
1137 /*
1138  * Set up search table for MIMO
1139  */
1140 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1141                              struct iwl_lq_sta *lq_sta,
1142                              struct ieee80211_conf *conf,
1143                              struct sta_info *sta,
1144                              struct iwl_scale_tbl_info *tbl, int index)
1145 {
1146         u16 rate_mask;
1147         s32 rate;
1148         s8 is_green = lq_sta->is_green;
1149
1150         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1151             !sta->sta.ht_info.ht_supported)
1152                 return -1;
1153
1154         if (((sta->sta.ht_info.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1155                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1156                 return -1;
1157
1158         /* Need both Tx chains/antennas to support MIMO */
1159         if (priv->hw_params.tx_chains_num < 2)
1160                 return -1;
1161
1162         IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1163
1164         tbl->lq_type = LQ_MIMO2;
1165         tbl->is_dup = lq_sta->is_dup;
1166         tbl->action = 0;
1167         rate_mask = lq_sta->active_mimo2_rate;
1168
1169         if (priv->current_ht_config.supported_chan_width
1170                                         == IWL_CHANNEL_WIDTH_40MHZ)
1171                 tbl->is_fat = 1;
1172         else
1173                 tbl->is_fat = 0;
1174
1175         /* FIXME: - don't toggle SGI here
1176         if (tbl->is_fat) {
1177                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1178                         tbl->is_SGI = 1;
1179                 else
1180                         tbl->is_SGI = 0;
1181         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1182                 tbl->is_SGI = 1;
1183         else
1184                 tbl->is_SGI = 0;
1185         */
1186
1187         rs_set_expected_tpt_table(lq_sta, tbl);
1188
1189         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1190
1191         IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1192
1193         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1194                 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1195                                                 rate, rate_mask);
1196                 return -1;
1197         }
1198         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1199
1200         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1201                      tbl->current_rate, is_green);
1202         return 0;
1203 }
1204
1205 /*
1206  * Set up search table for SISO
1207  */
1208 static int rs_switch_to_siso(struct iwl_priv *priv,
1209                              struct iwl_lq_sta *lq_sta,
1210                              struct ieee80211_conf *conf,
1211                              struct sta_info *sta,
1212                              struct iwl_scale_tbl_info *tbl, int index)
1213 {
1214         u16 rate_mask;
1215         u8 is_green = lq_sta->is_green;
1216         s32 rate;
1217
1218         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1219             !sta->sta.ht_info.ht_supported)
1220                 return -1;
1221
1222         IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1223
1224         tbl->is_dup = lq_sta->is_dup;
1225         tbl->lq_type = LQ_SISO;
1226         tbl->action = 0;
1227         rate_mask = lq_sta->active_siso_rate;
1228
1229         if (priv->current_ht_config.supported_chan_width
1230             == IWL_CHANNEL_WIDTH_40MHZ)
1231                 tbl->is_fat = 1;
1232         else
1233                 tbl->is_fat = 0;
1234
1235         /* FIXME: - don't toggle SGI here
1236         if (tbl->is_fat) {
1237                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1238                         tbl->is_SGI = 1;
1239                 else
1240                         tbl->is_SGI = 0;
1241         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1242                 tbl->is_SGI = 1;
1243         else
1244                 tbl->is_SGI = 0;
1245         */
1246
1247         if (is_green)
1248                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1249
1250         rs_set_expected_tpt_table(lq_sta, tbl);
1251         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1252
1253         IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1254         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1255                 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1256                              rate, rate_mask);
1257                 return -1;
1258         }
1259         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1260         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1261                      tbl->current_rate, is_green);
1262         return 0;
1263 }
1264
1265 /*
1266  * Try to switch to new modulation mode from legacy
1267  */
1268 static int rs_move_legacy_other(struct iwl_priv *priv,
1269                                 struct iwl_lq_sta *lq_sta,
1270                                 struct ieee80211_conf *conf,
1271                                 struct sta_info *sta,
1272                                 int index)
1273 {
1274         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1275         struct iwl_scale_tbl_info *search_tbl =
1276                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1277         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1278         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1279                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1280         u8 start_action = tbl->action;
1281         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1282         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1283         int ret = 0;
1284
1285         for (; ;) {
1286                 switch (tbl->action) {
1287                 case IWL_LEGACY_SWITCH_ANTENNA1:
1288                 case IWL_LEGACY_SWITCH_ANTENNA2:
1289                         IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1290
1291                         lq_sta->action_counter++;
1292
1293                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1294                                                         tx_chains_num <= 1) ||
1295                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1296                                                         tx_chains_num <= 2))
1297                                 break;
1298
1299                         /* Don't change antenna if success has been great */
1300                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1301                                 break;
1302
1303                         /* Set up search table to try other antenna */
1304                         memcpy(search_tbl, tbl, sz);
1305
1306                         if (rs_toggle_antenna(valid_tx_ant,
1307                                 &search_tbl->current_rate, search_tbl)) {
1308                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1309                                 goto out;
1310                         }
1311                         break;
1312                 case IWL_LEGACY_SWITCH_SISO:
1313                         IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1314
1315                         /* Set up search table to try SISO */
1316                         memcpy(search_tbl, tbl, sz);
1317                         search_tbl->is_SGI = 0;
1318                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1319                                                  search_tbl, index);
1320                         if (!ret) {
1321                                 lq_sta->action_counter = 0;
1322                                 goto out;
1323                         }
1324
1325                         break;
1326                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1327                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1328                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1329                         IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1330
1331                         /* Set up search table to try MIMO */
1332                         memcpy(search_tbl, tbl, sz);
1333                         search_tbl->is_SGI = 0;
1334
1335                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1336                                 search_tbl->ant_type = ANT_AB;
1337                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1338                                 search_tbl->ant_type = ANT_AC;
1339                         else
1340                                 search_tbl->ant_type = ANT_BC;
1341
1342                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1343                                 break;
1344
1345                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1346                                                  search_tbl, index);
1347                         if (!ret) {
1348                                 lq_sta->action_counter = 0;
1349                                 goto out;
1350                         }
1351                         break;
1352                 }
1353                 tbl->action++;
1354                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1355                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1356
1357                 if (tbl->action == start_action)
1358                         break;
1359
1360         }
1361         search_tbl->lq_type = LQ_NONE;
1362         return 0;
1363
1364 out:
1365         lq_sta->search_better_tbl = 1;
1366         tbl->action++;
1367         if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1368                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1369         return 0;
1370
1371 }
1372
1373 /*
1374  * Try to switch to new modulation mode from SISO
1375  */
1376 static int rs_move_siso_to_other(struct iwl_priv *priv,
1377                                  struct iwl_lq_sta *lq_sta,
1378                                  struct ieee80211_conf *conf,
1379                                  struct sta_info *sta, int index)
1380 {
1381         u8 is_green = lq_sta->is_green;
1382         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1383         struct iwl_scale_tbl_info *search_tbl =
1384                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1385         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1386         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1387                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1388         u8 start_action = tbl->action;
1389         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1390         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1391         int ret;
1392
1393         for (;;) {
1394                 lq_sta->action_counter++;
1395                 switch (tbl->action) {
1396                 case IWL_SISO_SWITCH_ANTENNA1:
1397                 case IWL_SISO_SWITCH_ANTENNA2:
1398                         IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1399
1400                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1401                                                         tx_chains_num <= 1) ||
1402                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1403                                                         tx_chains_num <= 2))
1404                                 break;
1405
1406                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1407                                 break;
1408
1409                         memcpy(search_tbl, tbl, sz);
1410                         if (rs_toggle_antenna(valid_tx_ant,
1411                                        &search_tbl->current_rate, search_tbl))
1412                                 goto out;
1413                         break;
1414                 case IWL_SISO_SWITCH_MIMO2_AB:
1415                 case IWL_SISO_SWITCH_MIMO2_AC:
1416                 case IWL_SISO_SWITCH_MIMO2_BC:
1417                         IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1418                         memcpy(search_tbl, tbl, sz);
1419                         search_tbl->is_SGI = 0;
1420
1421                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1422                                 search_tbl->ant_type = ANT_AB;
1423                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1424                                 search_tbl->ant_type = ANT_AC;
1425                         else
1426                                 search_tbl->ant_type = ANT_BC;
1427
1428                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1429                                 break;
1430
1431                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1432                                                  search_tbl, index);
1433                         if (!ret)
1434                                 goto out;
1435                         break;
1436                 case IWL_SISO_SWITCH_GI:
1437                         if (!tbl->is_fat &&
1438                                 !(priv->current_ht_config.sgf &
1439                                                 HT_SHORT_GI_20MHZ))
1440                                 break;
1441                         if (tbl->is_fat &&
1442                                 !(priv->current_ht_config.sgf &
1443                                                 HT_SHORT_GI_40MHZ))
1444                                 break;
1445
1446                         IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1447
1448                         memcpy(search_tbl, tbl, sz);
1449                         if (is_green) {
1450                                 if (!tbl->is_SGI)
1451                                         break;
1452                                 else
1453                                         IWL_ERROR("SGI was set in GF+SISO\n");
1454                         }
1455                         search_tbl->is_SGI = !tbl->is_SGI;
1456                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1457                         if (tbl->is_SGI) {
1458                                 s32 tpt = lq_sta->last_tpt / 100;
1459                                 if (tpt >= search_tbl->expected_tpt[index])
1460                                         break;
1461                         }
1462                         search_tbl->current_rate = rate_n_flags_from_tbl(
1463                                                 search_tbl, index, is_green);
1464                         goto out;
1465                 }
1466                 tbl->action++;
1467                 if (tbl->action > IWL_SISO_SWITCH_GI)
1468                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1469
1470                 if (tbl->action == start_action)
1471                         break;
1472         }
1473         search_tbl->lq_type = LQ_NONE;
1474         return 0;
1475
1476  out:
1477         lq_sta->search_better_tbl = 1;
1478         tbl->action++;
1479         if (tbl->action > IWL_SISO_SWITCH_GI)
1480                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1481         return 0;
1482 }
1483
1484 /*
1485  * Try to switch to new modulation mode from MIMO
1486  */
1487 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1488                                  struct iwl_lq_sta *lq_sta,
1489                                  struct ieee80211_conf *conf,
1490                                  struct sta_info *sta, int index)
1491 {
1492         s8 is_green = lq_sta->is_green;
1493         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1494         struct iwl_scale_tbl_info *search_tbl =
1495                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1496         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1497         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1498                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1499         u8 start_action = tbl->action;
1500         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1501         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1502         int ret;
1503
1504         for (;;) {
1505                 lq_sta->action_counter++;
1506                 switch (tbl->action) {
1507                 case IWL_MIMO2_SWITCH_ANTENNA1:
1508                 case IWL_MIMO2_SWITCH_ANTENNA2:
1509                         IWL_DEBUG_RATE("LQ: MIMO toggle Antennas\n");
1510
1511                         if (tx_chains_num <= 2)
1512                                 break;
1513
1514                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1515                                 break;
1516
1517                         memcpy(search_tbl, tbl, sz);
1518                         if (rs_toggle_antenna(valid_tx_ant,
1519                                        &search_tbl->current_rate, search_tbl))
1520                                 goto out;
1521                         break;
1522                 case IWL_MIMO2_SWITCH_SISO_A:
1523                 case IWL_MIMO2_SWITCH_SISO_B:
1524                 case IWL_MIMO2_SWITCH_SISO_C:
1525                         IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1526
1527                         /* Set up new search table for SISO */
1528                         memcpy(search_tbl, tbl, sz);
1529
1530                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1531                                 search_tbl->ant_type = ANT_A;
1532                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1533                                 search_tbl->ant_type = ANT_B;
1534                         else
1535                                 search_tbl->ant_type = ANT_C;
1536
1537                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1538                                 break;
1539
1540                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1541                                                  search_tbl, index);
1542                         if (!ret)
1543                                 goto out;
1544
1545                         break;
1546
1547                 case IWL_MIMO2_SWITCH_GI:
1548                         if (!tbl->is_fat &&
1549                                 !(priv->current_ht_config.sgf &
1550                                                 HT_SHORT_GI_20MHZ))
1551                                 break;
1552                         if (tbl->is_fat &&
1553                                 !(priv->current_ht_config.sgf &
1554                                                 HT_SHORT_GI_40MHZ))
1555                                 break;
1556
1557                         IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1558
1559                         /* Set up new search table for MIMO */
1560                         memcpy(search_tbl, tbl, sz);
1561                         search_tbl->is_SGI = !tbl->is_SGI;
1562                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1563                         /*
1564                          * If active table already uses the fastest possible
1565                          * modulation (dual stream with short guard interval),
1566                          * and it's working well, there's no need to look
1567                          * for a better type of modulation!
1568                          */
1569                         if (tbl->is_SGI) {
1570                                 s32 tpt = lq_sta->last_tpt / 100;
1571                                 if (tpt >= search_tbl->expected_tpt[index])
1572                                         break;
1573                         }
1574                         search_tbl->current_rate = rate_n_flags_from_tbl(
1575                                                 search_tbl, index, is_green);
1576                         goto out;
1577
1578                 }
1579                 tbl->action++;
1580                 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1581                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1582
1583                 if (tbl->action == start_action)
1584                         break;
1585         }
1586         search_tbl->lq_type = LQ_NONE;
1587         return 0;
1588  out:
1589         lq_sta->search_better_tbl = 1;
1590         tbl->action++;
1591         if (tbl->action > IWL_MIMO2_SWITCH_GI)
1592                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1593         return 0;
1594
1595 }
1596
1597 /*
1598  * Check whether we should continue using same modulation mode, or
1599  * begin search for a new mode, based on:
1600  * 1) # tx successes or failures while using this mode
1601  * 2) # times calling this function
1602  * 3) elapsed time in this mode (not used, for now)
1603  */
1604 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1605 {
1606         struct iwl_scale_tbl_info *tbl;
1607         int i;
1608         int active_tbl;
1609         int flush_interval_passed = 0;
1610         struct iwl_priv *priv;
1611
1612         priv = lq_sta->drv;
1613         active_tbl = lq_sta->active_tbl;
1614
1615         tbl = &(lq_sta->lq_info[active_tbl]);
1616
1617         /* If we've been disallowing search, see if we should now allow it */
1618         if (lq_sta->stay_in_tbl) {
1619
1620                 /* Elapsed time using current modulation mode */
1621                 if (lq_sta->flush_timer)
1622                         flush_interval_passed =
1623                             time_after(jiffies,
1624                                        (unsigned long)(lq_sta->flush_timer +
1625                                         IWL_RATE_SCALE_FLUSH_INTVL));
1626
1627                 /*
1628                  * Check if we should allow search for new modulation mode.
1629                  * If many frames have failed or succeeded, or we've used
1630                  * this same modulation for a long time, allow search, and
1631                  * reset history stats that keep track of whether we should
1632                  * allow a new search.  Also (below) reset all bitmaps and
1633                  * stats in active history.
1634                  */
1635                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1636                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1637                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1638                      && (flush_interval_passed))) {
1639                         IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1640                                      lq_sta->total_failed,
1641                                      lq_sta->total_success,
1642                                      flush_interval_passed);
1643
1644                         /* Allow search for new mode */
1645                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1646                         lq_sta->total_failed = 0;
1647                         lq_sta->total_success = 0;
1648                         lq_sta->flush_timer = 0;
1649
1650                 /*
1651                  * Else if we've used this modulation mode enough repetitions
1652                  * (regardless of elapsed time or success/failure), reset
1653                  * history bitmaps and rate-specific stats for all rates in
1654                  * active table.
1655                  */
1656                 } else {
1657                         lq_sta->table_count++;
1658                         if (lq_sta->table_count >=
1659                             lq_sta->table_count_limit) {
1660                                 lq_sta->table_count = 0;
1661
1662                                 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1663                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1664                                         rs_rate_scale_clear_window(
1665                                                 &(tbl->win[i]));
1666                         }
1667                 }
1668
1669                 /* If transitioning to allow "search", reset all history
1670                  * bitmaps and stats in active table (this will become the new
1671                  * "search" table). */
1672                 if (!lq_sta->stay_in_tbl) {
1673                         for (i = 0; i < IWL_RATE_COUNT; i++)
1674                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1675                 }
1676         }
1677 }
1678
1679 /*
1680  * Do rate scaling and search for new modulation mode.
1681  */
1682 static void rs_rate_scale_perform(struct iwl_priv *priv,
1683                                   struct net_device *dev,
1684                                   struct ieee80211_hdr *hdr,
1685                                   struct sta_info *sta)
1686 {
1687         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1688         struct ieee80211_hw *hw = local_to_hw(local);
1689         struct ieee80211_conf *conf = &hw->conf;
1690         int low = IWL_RATE_INVALID;
1691         int high = IWL_RATE_INVALID;
1692         int index;
1693         int i;
1694         struct iwl_rate_scale_data *window = NULL;
1695         int current_tpt = IWL_INVALID_VALUE;
1696         int low_tpt = IWL_INVALID_VALUE;
1697         int high_tpt = IWL_INVALID_VALUE;
1698         u32 fail_count;
1699         s8 scale_action = 0;
1700         __le16 fc;
1701         u16 rate_mask;
1702         u8 update_lq = 0;
1703         struct iwl_lq_sta *lq_sta;
1704         struct iwl_scale_tbl_info *tbl, *tbl1;
1705         u16 rate_scale_index_msk = 0;
1706         u32 rate;
1707         u8 is_green = 0;
1708         u8 active_tbl = 0;
1709         u8 done_search = 0;
1710         u16 high_low;
1711         s32 sr;
1712         u8 tid = MAX_TID_COUNT;
1713
1714         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1715
1716         fc = hdr->frame_control;
1717         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1718                 /* Send management frames and broadcast/multicast data using
1719                  * lowest rate. */
1720                 /* TODO: this could probably be improved.. */
1721                 return;
1722         }
1723
1724         if (!sta || !sta->rate_ctrl_priv)
1725                 return;
1726
1727         lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv;
1728         lq_sta->supp_rates = sta->sta.supp_rates[lq_sta->band];
1729
1730         tid = rs_tl_add_packet(lq_sta, hdr);
1731
1732         /*
1733          * Select rate-scale / modulation-mode table to work with in
1734          * the rest of this function:  "search" if searching for better
1735          * modulation mode, or "active" if doing rate scaling within a mode.
1736          */
1737         if (!lq_sta->search_better_tbl)
1738                 active_tbl = lq_sta->active_tbl;
1739         else
1740                 active_tbl = 1 - lq_sta->active_tbl;
1741
1742         tbl = &(lq_sta->lq_info[active_tbl]);
1743         is_green = lq_sta->is_green;
1744
1745         /* current tx rate */
1746         index = lq_sta->last_txrate_idx;
1747
1748         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1749                        tbl->lq_type);
1750
1751         /* rates available for this association, and for modulation mode */
1752         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1753
1754         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1755
1756         /* mask with station rate restriction */
1757         if (is_legacy(tbl->lq_type)) {
1758                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1759                         /* supp_rates has no CCK bits in A mode */
1760                         rate_scale_index_msk = (u16) (rate_mask &
1761                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1762                 else
1763                         rate_scale_index_msk = (u16) (rate_mask &
1764                                                       lq_sta->supp_rates);
1765
1766         } else
1767                 rate_scale_index_msk = rate_mask;
1768
1769         if (!rate_scale_index_msk)
1770                 rate_scale_index_msk = rate_mask;
1771
1772         if (!((1 << index) & rate_scale_index_msk)) {
1773                 IWL_ERROR("Current Rate is not valid\n");
1774                 return;
1775         }
1776
1777         /* Get expected throughput table and history window for current rate */
1778         if (!tbl->expected_tpt) {
1779                 IWL_ERROR("tbl->expected_tpt is NULL\n");
1780                 return;
1781         }
1782
1783         window = &(tbl->win[index]);
1784
1785         /*
1786          * If there is not enough history to calculate actual average
1787          * throughput, keep analyzing results of more tx frames, without
1788          * changing rate or mode (bypass most of the rest of this function).
1789          * Set up new rate table in uCode only if old rate is not supported
1790          * in current association (use new rate found above).
1791          */
1792         fail_count = window->counter - window->success_counter;
1793         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1794                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1795                 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1796                                "for index %d\n",
1797                                window->success_counter, window->counter, index);
1798
1799                 /* Can't calculate this yet; not enough history */
1800                 window->average_tpt = IWL_INVALID_VALUE;
1801
1802                 /* Should we stay with this modulation mode,
1803                  * or search for a new one? */
1804                 rs_stay_in_table(lq_sta);
1805
1806                 goto out;
1807         }
1808
1809         /* Else we have enough samples; calculate estimate of
1810          * actual average throughput */
1811
1812         BUG_ON(window->average_tpt != ((window->success_ratio *
1813                         tbl->expected_tpt[index] + 64) / 128));
1814
1815         /* If we are searching for better modulation mode, check success. */
1816         if (lq_sta->search_better_tbl) {
1817
1818                 /* If good success, continue using the "search" mode;
1819                  * no need to send new link quality command, since we're
1820                  * continuing to use the setup that we've been trying. */
1821                 if (window->average_tpt > lq_sta->last_tpt) {
1822
1823                         IWL_DEBUG_RATE("LQ: SWITCHING TO NEW TABLE "
1824                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1825                                         window->success_ratio,
1826                                         window->average_tpt,
1827                                         lq_sta->last_tpt);
1828
1829                         if (!is_legacy(tbl->lq_type))
1830                                 lq_sta->enable_counter = 1;
1831
1832                         /* Swap tables; "search" becomes "active" */
1833                         lq_sta->active_tbl = active_tbl;
1834                         current_tpt = window->average_tpt;
1835
1836                 /* Else poor success; go back to mode in "active" table */
1837                 } else {
1838
1839                         IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1840                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1841                                         window->success_ratio,
1842                                         window->average_tpt,
1843                                         lq_sta->last_tpt);
1844
1845                         /* Nullify "search" table */
1846                         tbl->lq_type = LQ_NONE;
1847
1848                         /* Revert to "active" table */
1849                         active_tbl = lq_sta->active_tbl;
1850                         tbl = &(lq_sta->lq_info[active_tbl]);
1851
1852                         /* Revert to "active" rate and throughput info */
1853                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1854                         current_tpt = lq_sta->last_tpt;
1855
1856                         /* Need to set up a new rate table in uCode */
1857                         update_lq = 1;
1858                 }
1859
1860                 /* Either way, we've made a decision; modulation mode
1861                  * search is done, allow rate adjustment next time. */
1862                 lq_sta->search_better_tbl = 0;
1863                 done_search = 1;        /* Don't switch modes below! */
1864                 goto lq_update;
1865         }
1866
1867         /* (Else) not in search of better modulation mode, try for better
1868          * starting rate, while staying in this mode. */
1869         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1870                                         tbl->lq_type);
1871         low = high_low & 0xff;
1872         high = (high_low >> 8) & 0xff;
1873
1874         sr = window->success_ratio;
1875
1876         /* Collect measured throughputs for current and adjacent rates */
1877         current_tpt = window->average_tpt;
1878         if (low != IWL_RATE_INVALID)
1879                 low_tpt = tbl->win[low].average_tpt;
1880         if (high != IWL_RATE_INVALID)
1881                 high_tpt = tbl->win[high].average_tpt;
1882
1883         scale_action = 0;
1884
1885         /* Too many failures, decrease rate */
1886         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1887                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1888                 scale_action = -1;
1889
1890         /* No throughput measured yet for adjacent rates; try increase. */
1891         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1892                    (high_tpt == IWL_INVALID_VALUE)) {
1893
1894                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1895                         scale_action = 1;
1896                 else if (low != IWL_RATE_INVALID)
1897                         scale_action = -1;
1898         }
1899
1900         /* Both adjacent throughputs are measured, but neither one has better
1901          * throughput; we're using the best rate, don't change it! */
1902         else if ((low_tpt != IWL_INVALID_VALUE) &&
1903                  (high_tpt != IWL_INVALID_VALUE) &&
1904                  (low_tpt < current_tpt) &&
1905                  (high_tpt < current_tpt))
1906                 scale_action = 0;
1907
1908         /* At least one adjacent rate's throughput is measured,
1909          * and may have better performance. */
1910         else {
1911                 /* Higher adjacent rate's throughput is measured */
1912                 if (high_tpt != IWL_INVALID_VALUE) {
1913                         /* Higher rate has better throughput */
1914                         if (high_tpt > current_tpt &&
1915                                         sr >= IWL_RATE_INCREASE_TH) {
1916                                 scale_action = 1;
1917                         } else {
1918                                 IWL_DEBUG_RATE
1919                                     ("decrease rate because of high tpt\n");
1920                                 scale_action = -1;
1921                         }
1922
1923                 /* Lower adjacent rate's throughput is measured */
1924                 } else if (low_tpt != IWL_INVALID_VALUE) {
1925                         /* Lower rate has better throughput */
1926                         if (low_tpt > current_tpt) {
1927                                 IWL_DEBUG_RATE
1928                                     ("decrease rate because of low tpt\n");
1929                                 scale_action = -1;
1930                         } else if (sr >= IWL_RATE_INCREASE_TH) {
1931                                 scale_action = 1;
1932                         }
1933                 }
1934         }
1935
1936         /* Sanity check; asked for decrease, but success rate or throughput
1937          * has been good at old rate.  Don't change it. */
1938         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1939                     ((sr > IWL_RATE_HIGH_TH) ||
1940                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1941                 scale_action = 0;
1942
1943         switch (scale_action) {
1944         case -1:
1945                 /* Decrease starting rate, update uCode's rate table */
1946                 if (low != IWL_RATE_INVALID) {
1947                         update_lq = 1;
1948                         index = low;
1949                 }
1950                 break;
1951         case 1:
1952                 /* Increase starting rate, update uCode's rate table */
1953                 if (high != IWL_RATE_INVALID) {
1954                         update_lq = 1;
1955                         index = high;
1956                 }
1957
1958                 break;
1959         case 0:
1960                 /* No change */
1961         default:
1962                 break;
1963         }
1964
1965         IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1966                     "high %d type %d\n",
1967                      index, scale_action, low, high, tbl->lq_type);
1968
1969 lq_update:
1970         /* Replace uCode's rate table for the destination station. */
1971         if (update_lq) {
1972                 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1973                 rs_fill_link_cmd(priv, lq_sta, rate);
1974                 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1975         }
1976
1977         /* Should we stay with this modulation mode, or search for a new one? */
1978         rs_stay_in_table(lq_sta);
1979
1980         /*
1981          * Search for new modulation mode if we're:
1982          * 1)  Not changing rates right now
1983          * 2)  Not just finishing up a search
1984          * 3)  Allowing a new search
1985          */
1986         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1987                 /* Save current throughput to compare with "search" throughput*/
1988                 lq_sta->last_tpt = current_tpt;
1989
1990                 /* Select a new "search" modulation mode to try.
1991                  * If one is found, set up the new "search" table. */
1992                 if (is_legacy(tbl->lq_type))
1993                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1994                 else if (is_siso(tbl->lq_type))
1995                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1996                 else
1997                         rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1998
1999                 /* If new "search" mode was selected, set up in uCode table */
2000                 if (lq_sta->search_better_tbl) {
2001                         /* Access the "search" table, clear its history. */
2002                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2003                         for (i = 0; i < IWL_RATE_COUNT; i++)
2004                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2005
2006                         /* Use new "search" start rate */
2007                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2008
2009                         IWL_DEBUG_RATE("Switch current  mcs: %X index: %d\n",
2010                                      tbl->current_rate, index);
2011                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2012                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2013                 }
2014
2015                 /* If the "active" (non-search) mode was legacy,
2016                  * and we've tried switching antennas,
2017                  * but we haven't been able to try HT modes (not available),
2018                  * stay with best antenna legacy modulation for a while
2019                  * before next round of mode comparisons. */
2020                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2021                 if (is_legacy(tbl1->lq_type) &&
2022                    (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
2023                     (lq_sta->action_counter >= 1)) {
2024                         lq_sta->action_counter = 0;
2025                         IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
2026                         rs_set_stay_in_table(priv, 1, lq_sta);
2027                 }
2028
2029                 /* If we're in an HT mode, and all 3 mode switch actions
2030                  * have been tried and compared, stay in this best modulation
2031                  * mode for a while before next round of mode comparisons. */
2032                 if (lq_sta->enable_counter &&
2033                     (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2034                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2035                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2036                             (tid != MAX_TID_COUNT)) {
2037                                 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
2038                                 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2039                         }
2040                         lq_sta->action_counter = 0;
2041                         rs_set_stay_in_table(priv, 0, lq_sta);
2042                 }
2043
2044         /*
2045          * Else, don't search for a new modulation mode.
2046          * Put new timestamp in stay-in-modulation-mode flush timer if:
2047          * 1)  Not changing rates right now
2048          * 2)  Not just finishing up a search
2049          * 3)  flush timer is empty
2050          */
2051         } else {
2052                 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2053                         lq_sta->flush_timer = jiffies;
2054         }
2055
2056 out:
2057         tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2058         i = index;
2059         lq_sta->last_txrate_idx = i;
2060
2061         return;
2062 }
2063
2064
2065 static void rs_initialize_lq(struct iwl_priv *priv,
2066                              struct ieee80211_conf *conf,
2067                              struct sta_info *sta)
2068 {
2069         struct iwl_lq_sta *lq_sta;
2070         struct iwl_scale_tbl_info *tbl;
2071         int rate_idx;
2072         int i;
2073         u32 rate;
2074         u8 use_green = rs_use_green(priv, conf);
2075         u8 active_tbl = 0;
2076         u8 valid_tx_ant;
2077
2078         if (!sta || !sta->rate_ctrl_priv)
2079                 goto out;
2080
2081         lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv;
2082         i = lq_sta->last_txrate_idx;
2083
2084         if ((lq_sta->lq.sta_id == 0xff) &&
2085             (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2086                 goto out;
2087
2088         valid_tx_ant = priv->hw_params.valid_tx_ant;
2089
2090         if (!lq_sta->search_better_tbl)
2091                 active_tbl = lq_sta->active_tbl;
2092         else
2093                 active_tbl = 1 - lq_sta->active_tbl;
2094
2095         tbl = &(lq_sta->lq_info[active_tbl]);
2096
2097         if ((i < 0) || (i >= IWL_RATE_COUNT))
2098                 i = 0;
2099
2100         /* FIXME:RS: This is also wrong in 4965 */
2101         rate = iwl_rates[i].plcp;
2102         rate |= RATE_MCS_ANT_B_MSK;
2103         rate &= ~RATE_MCS_ANT_A_MSK;
2104
2105         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2106                 rate |= RATE_MCS_CCK_MSK;
2107
2108         tbl->ant_type = ANT_B;
2109         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2110         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2111             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2112
2113         rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2114         tbl->current_rate = rate;
2115         rs_set_expected_tpt_table(lq_sta, tbl);
2116         rs_fill_link_cmd(NULL, lq_sta, rate);
2117         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2118  out:
2119         return;
2120 }
2121
2122 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2123                         struct ieee80211_supported_band *sband,
2124                         struct sk_buff *skb,
2125                         struct rate_selection *sel)
2126 {
2127
2128         int i;
2129         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2130         struct ieee80211_conf *conf = &local->hw.conf;
2131         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2132         struct sta_info *sta;
2133         __le16 fc;
2134         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2135         struct iwl_lq_sta *lq_sta;
2136
2137         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2138
2139         rcu_read_lock();
2140
2141         sta = sta_info_get(local, hdr->addr1);
2142
2143         /* Send management frames and broadcast/multicast data using lowest
2144          * rate. */
2145         fc = hdr->frame_control;
2146         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2147             !sta || !sta->rate_ctrl_priv) {
2148                 sel->rate_idx = rate_lowest_index(local, sband, sta);
2149                 goto out;
2150         }
2151
2152         lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv;
2153         i = lq_sta->last_txrate_idx;
2154
2155         if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2156             !lq_sta->ibss_sta_added) {
2157                 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2158                 DECLARE_MAC_BUF(mac);
2159
2160                 if (sta_id == IWL_INVALID_STATION) {
2161                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2162                                        print_mac(mac, hdr->addr1));
2163                         sta_id = iwl_add_station_flags(priv, hdr->addr1,
2164                                                         0, CMD_ASYNC, NULL);
2165                 }
2166                 if ((sta_id != IWL_INVALID_STATION)) {
2167                         lq_sta->lq.sta_id = sta_id;
2168                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2169                         lq_sta->ibss_sta_added = 1;
2170                         rs_initialize_lq(priv, conf, sta);
2171                 }
2172         }
2173
2174         if ((i < 0) || (i > IWL_RATE_COUNT)) {
2175                 sel->rate_idx = rate_lowest_index(local, sband, sta);
2176                 goto out;
2177         }
2178
2179         if (sband->band == IEEE80211_BAND_5GHZ)
2180                 i -= IWL_FIRST_OFDM_RATE;
2181         sel->rate_idx = i;
2182 out:
2183         rcu_read_unlock();
2184 }
2185
2186 static void *rs_alloc_sta(void *priv_rate, gfp_t gfp)
2187 {
2188         struct iwl_lq_sta *lq_sta;
2189         struct iwl_priv *priv;
2190         int i, j;
2191
2192         priv = (struct iwl_priv *)priv_rate;
2193         IWL_DEBUG_RATE("create station rate scale window\n");
2194
2195         lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2196
2197         if (lq_sta == NULL)
2198                 return NULL;
2199         lq_sta->lq.sta_id = 0xff;
2200
2201
2202         for (j = 0; j < LQ_SIZE; j++)
2203                 for (i = 0; i < IWL_RATE_COUNT; i++)
2204                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2205
2206         return lq_sta;
2207 }
2208
2209 static void rs_rate_init(void *priv_rate, void *priv_sta,
2210                          struct ieee80211_local *local,
2211                          struct sta_info *sta)
2212 {
2213         int i, j;
2214         struct ieee80211_conf *conf = &local->hw.conf;
2215         struct ieee80211_supported_band *sband;
2216         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2217         struct iwl_lq_sta *lq_sta = priv_sta;
2218
2219         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2220
2221         lq_sta->flush_timer = 0;
2222         lq_sta->supp_rates = sta->sta.supp_rates[sband->band];
2223         for (j = 0; j < LQ_SIZE; j++)
2224                 for (i = 0; i < IWL_RATE_COUNT; i++)
2225                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2226
2227         IWL_DEBUG_RATE("LQ: *** rate scale station global init ***\n");
2228         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2229          * the lowest or the highest rate.. Could consider using RSSI from
2230          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2231          * after assoc.. */
2232
2233         lq_sta->ibss_sta_added = 0;
2234         if (priv->iw_mode == NL80211_IFTYPE_AP) {
2235                 u8 sta_id = iwl_find_station(priv, sta->sta.addr);
2236                 DECLARE_MAC_BUF(mac);
2237
2238                 /* for IBSS the call are from tasklet */
2239                 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2240                              print_mac(mac, sta->sta.addr));
2241
2242                 if (sta_id == IWL_INVALID_STATION) {
2243                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2244                                        print_mac(mac, sta->sta.addr));
2245                         sta_id = iwl_add_station_flags(priv, sta->sta.addr,
2246                                                         0, CMD_ASYNC, NULL);
2247                 }
2248                 if ((sta_id != IWL_INVALID_STATION)) {
2249                         lq_sta->lq.sta_id = sta_id;
2250                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2251                 }
2252                 /* FIXME: this is w/a remove it later */
2253                 priv->assoc_station_added = 1;
2254         }
2255
2256         /* Find highest tx rate supported by hardware and destination station */
2257         lq_sta->last_txrate_idx = 3;
2258         for (i = 0; i < sband->n_bitrates; i++)
2259                 if (sta->sta.supp_rates[sband->band] & BIT(i))
2260                         lq_sta->last_txrate_idx = i;
2261
2262         /* For MODE_IEEE80211A, skip over cck rates in global rate table */
2263         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2264                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2265
2266         lq_sta->is_dup = 0;
2267         lq_sta->is_green = rs_use_green(priv, conf);
2268         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2269         lq_sta->active_rate_basic = priv->active_rate_basic;
2270         lq_sta->band = priv->band;
2271         /*
2272          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2273          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2274          */
2275         lq_sta->active_siso_rate = conf->ht_conf.supp_mcs_set[0] << 1;
2276         lq_sta->active_siso_rate |= conf->ht_conf.supp_mcs_set[0] & 0x1;
2277         lq_sta->active_siso_rate &= ~((u16)0x2);
2278         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2279
2280         /* Same here */
2281         lq_sta->active_mimo2_rate = conf->ht_conf.supp_mcs_set[1] << 1;
2282         lq_sta->active_mimo2_rate |= conf->ht_conf.supp_mcs_set[1] & 0x1;
2283         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2284         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2285
2286         lq_sta->active_mimo3_rate = conf->ht_conf.supp_mcs_set[2] << 1;
2287         lq_sta->active_mimo3_rate |= conf->ht_conf.supp_mcs_set[2] & 0x1;
2288         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2289         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2290
2291         IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2292                      lq_sta->active_siso_rate,
2293                      lq_sta->active_mimo2_rate,
2294                      lq_sta->active_mimo3_rate);
2295
2296         /* These values will be overriden later */
2297         lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2298         lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2299
2300         /* as default allow aggregation for all tids */
2301         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2302         lq_sta->drv = priv;
2303
2304         rs_initialize_lq(priv, conf, sta);
2305 }
2306
2307 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2308                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2309 {
2310         struct iwl_scale_tbl_info tbl_type;
2311         int index = 0;
2312         int rate_idx;
2313         int repeat_rate = 0;
2314         u8 ant_toggle_cnt = 0;
2315         u8 use_ht_possible = 1;
2316         u8 valid_tx_ant = 0;
2317         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2318
2319         /* Override starting rate (index 0) if needed for debug purposes */
2320         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2321
2322         /* Interpret new_rate (rate_n_flags) */
2323         memset(&tbl_type, 0, sizeof(tbl_type));
2324         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2325                                   &tbl_type, &rate_idx);
2326
2327         /* How many times should we repeat the initial rate? */
2328         if (is_legacy(tbl_type.lq_type)) {
2329                 ant_toggle_cnt = 1;
2330                 repeat_rate = IWL_NUMBER_TRY;
2331         } else {
2332                 repeat_rate = IWL_HT_NUMBER_TRY;
2333         }
2334
2335         lq_cmd->general_params.mimo_delimiter =
2336                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2337
2338         /* Fill 1st table entry (index 0) */
2339         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2340
2341         if (num_of_ant(tbl_type.ant_type) == 1) {
2342                 lq_cmd->general_params.single_stream_ant_msk =
2343                                                 tbl_type.ant_type;
2344         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2345                 lq_cmd->general_params.dual_stream_ant_msk =
2346                                                 tbl_type.ant_type;
2347         } /* otherwise we don't modify the existing value */
2348
2349         index++;
2350         repeat_rate--;
2351
2352         if (priv)
2353                 valid_tx_ant = priv->hw_params.valid_tx_ant;
2354
2355         /* Fill rest of rate table */
2356         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2357                 /* Repeat initial/next rate.
2358                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2359                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2360                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2361                         if (is_legacy(tbl_type.lq_type)) {
2362                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2363                                         ant_toggle_cnt++;
2364                                 else if (priv &&
2365                                          rs_toggle_antenna(valid_tx_ant,
2366                                                         &new_rate, &tbl_type))
2367                                         ant_toggle_cnt = 1;
2368 }
2369
2370                         /* Override next rate if needed for debug purposes */
2371                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2372
2373                         /* Fill next table entry */
2374                         lq_cmd->rs_table[index].rate_n_flags =
2375                                         cpu_to_le32(new_rate);
2376                         repeat_rate--;
2377                         index++;
2378                 }
2379
2380                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2381                                                 &rate_idx);
2382
2383                 /* Indicate to uCode which entries might be MIMO.
2384                  * If initial rate was MIMO, this will finally end up
2385                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2386                 if (is_mimo(tbl_type.lq_type))
2387                         lq_cmd->general_params.mimo_delimiter = index;
2388
2389                 /* Get next rate */
2390                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2391                                              use_ht_possible);
2392
2393                 /* How many times should we repeat the next rate? */
2394                 if (is_legacy(tbl_type.lq_type)) {
2395                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2396                                 ant_toggle_cnt++;
2397                         else if (priv &&
2398                                  rs_toggle_antenna(valid_tx_ant,
2399                                                    &new_rate, &tbl_type))
2400                                 ant_toggle_cnt = 1;
2401
2402                         repeat_rate = IWL_NUMBER_TRY;
2403                 } else {
2404                         repeat_rate = IWL_HT_NUMBER_TRY;
2405                 }
2406
2407                 /* Don't allow HT rates after next pass.
2408                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2409                 use_ht_possible = 0;
2410
2411                 /* Override next rate if needed for debug purposes */
2412                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2413
2414                 /* Fill next table entry */
2415                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2416
2417                 index++;
2418                 repeat_rate--;
2419         }
2420
2421         lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2422         lq_cmd->agg_params.agg_dis_start_th = 3;
2423         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2424 }
2425
2426 static void *rs_alloc(struct ieee80211_local *local)
2427 {
2428         return local->hw.priv;
2429 }
2430 /* rate scale requires free function to be implemented */
2431 static void rs_free(void *priv_rate)
2432 {
2433         return;
2434 }
2435
2436 static void rs_clear(void *priv_rate)
2437 {
2438 #ifdef CONFIG_IWLWIFI_DEBUG
2439         struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2440
2441         IWL_DEBUG_RATE("enter\n");
2442
2443         /* TODO - add rate scale state reset */
2444
2445         IWL_DEBUG_RATE("leave\n");
2446 #endif /* CONFIG_IWLWIFI_DEBUG */
2447 }
2448
2449 static void rs_free_sta(void *priv_rate, void *priv_sta)
2450 {
2451         struct iwl_lq_sta *lq_sta = priv_sta;
2452         struct iwl_priv *priv;
2453
2454         priv = (struct iwl_priv *)priv_rate;
2455         IWL_DEBUG_RATE("enter\n");
2456         kfree(lq_sta);
2457         IWL_DEBUG_RATE("leave\n");
2458 }
2459
2460
2461 #ifdef CONFIG_MAC80211_DEBUGFS
2462 static int open_file_generic(struct inode *inode, struct file *file)
2463 {
2464         file->private_data = inode->i_private;
2465         return 0;
2466 }
2467 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2468                              u32 *rate_n_flags, int index)
2469 {
2470         struct iwl_priv *priv;
2471
2472         priv = lq_sta->drv;
2473         if (lq_sta->dbg_fixed_rate) {
2474                 if (index < 12) {
2475                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2476                 } else {
2477                         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2478                                 *rate_n_flags = 0x800D;
2479                         else
2480                                 *rate_n_flags = 0x820A;
2481                 }
2482                 IWL_DEBUG_RATE("Fixed rate ON\n");
2483         } else {
2484                 IWL_DEBUG_RATE("Fixed rate OFF\n");
2485         }
2486 }
2487
2488 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2489                         const char __user *user_buf, size_t count, loff_t *ppos)
2490 {
2491         struct iwl_lq_sta *lq_sta = file->private_data;
2492         struct iwl_priv *priv;
2493         char buf[64];
2494         int buf_size;
2495         u32 parsed_rate;
2496
2497         priv = lq_sta->drv;
2498         memset(buf, 0, sizeof(buf));
2499         buf_size = min(count, sizeof(buf) -  1);
2500         if (copy_from_user(buf, user_buf, buf_size))
2501                 return -EFAULT;
2502
2503         if (sscanf(buf, "%x", &parsed_rate) == 1)
2504                 lq_sta->dbg_fixed_rate = parsed_rate;
2505         else
2506                 lq_sta->dbg_fixed_rate = 0;
2507
2508         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2509         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2510         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2511         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2512
2513         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2514                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2515
2516         if (lq_sta->dbg_fixed_rate) {
2517                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2518                 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2519         }
2520
2521         return count;
2522 }
2523
2524 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2525                         char __user *user_buf, size_t count, loff_t *ppos)
2526 {
2527         char buff[1024];
2528         int desc = 0;
2529         int i = 0;
2530
2531         struct iwl_lq_sta *lq_sta = file->private_data;
2532
2533         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2534         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2535                         lq_sta->total_failed, lq_sta->total_success,
2536                         lq_sta->active_legacy_rate);
2537         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2538                         lq_sta->dbg_fixed_rate);
2539         desc += sprintf(buff+desc, "general:"
2540                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2541                 lq_sta->lq.general_params.flags,
2542                 lq_sta->lq.general_params.mimo_delimiter,
2543                 lq_sta->lq.general_params.single_stream_ant_msk,
2544                 lq_sta->lq.general_params.dual_stream_ant_msk);
2545
2546         desc += sprintf(buff+desc, "agg:"
2547                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2548                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2549                         lq_sta->lq.agg_params.agg_dis_start_th,
2550                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2551
2552         desc += sprintf(buff+desc,
2553                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2554                         lq_sta->lq.general_params.start_rate_index[0],
2555                         lq_sta->lq.general_params.start_rate_index[1],
2556                         lq_sta->lq.general_params.start_rate_index[2],
2557                         lq_sta->lq.general_params.start_rate_index[3]);
2558
2559
2560         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2561                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2562                         i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2563
2564         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2565 }
2566
2567 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2568         .write = rs_sta_dbgfs_scale_table_write,
2569         .read = rs_sta_dbgfs_scale_table_read,
2570         .open = open_file_generic,
2571 };
2572 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2573                         char __user *user_buf, size_t count, loff_t *ppos)
2574 {
2575         char buff[1024];
2576         int desc = 0;
2577         int i, j;
2578
2579         struct iwl_lq_sta *lq_sta = file->private_data;
2580         for (i = 0; i < LQ_SIZE; i++) {
2581                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2582                                 "rate=0x%X\n",
2583                                 lq_sta->active_tbl == i?"*":"x",
2584                                 lq_sta->lq_info[i].lq_type,
2585                                 lq_sta->lq_info[i].is_SGI,
2586                                 lq_sta->lq_info[i].is_fat,
2587                                 lq_sta->lq_info[i].is_dup,
2588                                 lq_sta->lq_info[i].current_rate);
2589                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2590                         desc += sprintf(buff+desc,
2591                                 "counter=%d success=%d %%=%d\n",
2592                                 lq_sta->lq_info[i].win[j].counter,
2593                                 lq_sta->lq_info[i].win[j].success_counter,
2594                                 lq_sta->lq_info[i].win[j].success_ratio);
2595                 }
2596         }
2597         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2598 }
2599
2600 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2601         .read = rs_sta_dbgfs_stats_table_read,
2602         .open = open_file_generic,
2603 };
2604
2605 static void rs_add_debugfs(void *priv, void *priv_sta,
2606                                         struct dentry *dir)
2607 {
2608         struct iwl_lq_sta *lq_sta = priv_sta;
2609         lq_sta->rs_sta_dbgfs_scale_table_file =
2610                 debugfs_create_file("rate_scale_table", 0600, dir,
2611                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2612         lq_sta->rs_sta_dbgfs_stats_table_file =
2613                 debugfs_create_file("rate_stats_table", 0600, dir,
2614                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2615         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2616                 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2617                 &lq_sta->tx_agg_tid_en);
2618
2619 }
2620
2621 static void rs_remove_debugfs(void *priv, void *priv_sta)
2622 {
2623         struct iwl_lq_sta *lq_sta = priv_sta;
2624         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2625         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2626         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2627 }
2628 #endif
2629
2630 static struct rate_control_ops rs_ops = {
2631         .module = NULL,
2632         .name = RS_NAME,
2633         .tx_status = rs_tx_status,
2634         .get_rate = rs_get_rate,
2635         .rate_init = rs_rate_init,
2636         .clear = rs_clear,
2637         .alloc = rs_alloc,
2638         .free = rs_free,
2639         .alloc_sta = rs_alloc_sta,
2640         .free_sta = rs_free_sta,
2641 #ifdef CONFIG_MAC80211_DEBUGFS
2642         .add_sta_debugfs = rs_add_debugfs,
2643         .remove_sta_debugfs = rs_remove_debugfs,
2644 #endif
2645 };
2646
2647 int iwlagn_rate_control_register(void)
2648 {
2649         return ieee80211_rate_control_register(&rs_ops);
2650 }
2651
2652 void iwlagn_rate_control_unregister(void)
2653 {
2654         ieee80211_rate_control_unregister(&rs_ops);
2655 }
2656