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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2009 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/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 "iwl-dev.h"
  39 #include "iwl-sta.h"
  40 #include "iwl-core.h"
  41
  42 #define RS_NAME "iwl-agn-rs"
  43
  44 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  45 #define IWL_NUMBER_TRY      1
  46 #define IWL_HT_NUMBER_TRY   3
  47
  48 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  49 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  50 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  51
  52 /* max allowed rate miss before sync LQ cmd */
  53 #define IWL_MISSED_RATE_MAX             15
  54 /* max time to accum history 2 seconds */
  55 #define IWL_RATE_SCALE_FLUSH_INTVL   (3*HZ)
  56
  57 static u8 rs_ht_to_legacy[] = {
  58         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  59         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  60         IWL_RATE_6M_INDEX,
  61         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  62         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  63         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  64         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  65 };
  66
  67 static const u8 ant_toggle_lookup[] = {
  68         /*ANT_NONE -> */ ANT_NONE,
  69         /*ANT_A    -> */ ANT_B,
  70         /*ANT_B    -> */ ANT_C,
  71         /*ANT_AB   -> */ ANT_BC,
  72         /*ANT_C    -> */ ANT_A,
  73         /*ANT_AC   -> */ ANT_AB,
  74         /*ANT_BC   -> */ ANT_AC,
  75         /*ANT_ABC  -> */ ANT_ABC,
  76 };
  77
  78 /**
  79  * struct iwl_rate_scale_data -- tx success history for one rate
  80  */
  81 struct iwl_rate_scale_data {
  82         u64 data;               /* bitmap of successful frames */
  83         s32 success_counter;    /* number of frames successful */
  84         s32 success_ratio;      /* per-cent * 128  */
  85         s32 counter;            /* number of frames attempted */
  86         s32 average_tpt;        /* success ratio * expected throughput */
  87         unsigned long stamp;
  88 };
  89
  90 /**
  91  * struct iwl_scale_tbl_info -- tx params and success history for all rates
  92  *
  93  * There are two of these in struct iwl_lq_sta,
  94  * one for "active", and one for "search".
  95  */
  96 struct iwl_scale_tbl_info {
  97         enum iwl_table_type lq_type;
  98         u8 ant_type;
  99         u8 is_SGI;      /* 1 = short guard interval */
 100         u8 is_ht40;     /* 1 = 40 MHz channel width */
 101         u8 is_dup;      /* 1 = duplicated data streams */
 102         u8 action;      /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
 103         u8 max_search;  /* maximun number of tables we can search */
 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         u64 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         s8 max_rate_idx;     /* Max rate set by user */
 155         u8 missed_rate_counter;
 156
 157         struct iwl_link_quality_cmd lq;
 158         struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
 159         struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
 160         u8 tx_agg_tid_en;
 161 #ifdef CONFIG_MAC80211_DEBUGFS
 162         struct dentry *rs_sta_dbgfs_scale_table_file;
 163         struct dentry *rs_sta_dbgfs_stats_table_file;
 164         struct dentry *rs_sta_dbgfs_rate_scale_data_file;
 165         struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
 166         u32 dbg_fixed_rate;
 167 #endif
 168         struct iwl_priv *drv;
 169
 170         /* used to be in sta_info */
 171         int last_txrate_idx;
 172         /* last tx rate_n_flags */
 173         u32 last_rate_n_flags;
 174 };
 175
 176 static void rs_rate_scale_perform(struct iwl_priv *priv,
 177                                    struct sk_buff *skb,
 178                                    struct ieee80211_sta *sta,
 179                                    struct iwl_lq_sta *lq_sta);
 180 static void rs_fill_link_cmd(struct iwl_priv *priv,
 181                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 182
 183
 184 #ifdef CONFIG_MAC80211_DEBUGFS
 185 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 186                              u32 *rate_n_flags, int index);
 187 #else
 188 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 189                              u32 *rate_n_flags, int index)
 190 {}
 191 #endif
 192
 193 /*
 194  * Expected throughput metrics for following rates:
 195  * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 196  * "G" is the only table that supports CCK (the first 4 rates).
 197  */
 198
 199 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
 200         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
 201 };
 202
 203 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
 204         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
 205 };
 206
 207 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
 208         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
 209 };
 210
 211 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
 212         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
 213 };
 214
 215 static s32 expected_tpt_mimo2_20MHz[IWL_RATE_COUNT] = {
 216         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
 217 };
 218
 219 static s32 expected_tpt_mimo2_20MHzSGI[IWL_RATE_COUNT] = {
 220         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
 221 };
 222
 223 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
 224         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
 225 };
 226
 227 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
 228         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
 229 };
 230
 231 static s32 expected_tpt_mimo2_40MHz[IWL_RATE_COUNT] = {
 232         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
 233 };
 234
 235 static s32 expected_tpt_mimo2_40MHzSGI[IWL_RATE_COUNT] = {
 236         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
 237 };
 238
 239 /* Expected throughput metric MIMO3 */
 240 static s32 expected_tpt_mimo3_20MHz[IWL_RATE_COUNT] = {
 241         0, 0, 0, 0, 99, 99, 153, 186, 208, 239, 256, 263, 268
 242 };
 243
 244 static s32 expected_tpt_mimo3_20MHzSGI[IWL_RATE_COUNT] = {
 245         0, 0, 0, 0, 106, 106, 162, 194, 215, 246, 262, 268, 273
 246 };
 247
 248 static s32 expected_tpt_mimo3_40MHz[IWL_RATE_COUNT] = {
 249         0, 0, 0, 0, 152, 152, 211, 239, 255, 279, 290, 294, 297
 250 };
 251
 252 static s32 expected_tpt_mimo3_40MHzSGI[IWL_RATE_COUNT] = {
 253         0, 0, 0, 0, 160, 160, 219, 245, 261, 284, 294, 297, 300
 254 };
 255
 256 /* mbps, mcs */
 257 const static struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 258   {"1", ""},
 259   {"2", ""},
 260   {"5.5", ""},
 261   {"11", ""},
 262   {"6", "BPSK 1/2"},
 263   {"9", "BPSK 1/2"},
 264   {"12", "QPSK 1/2"},
 265   {"18", "QPSK 3/4"},
 266   {"24", "16QAM 1/2"},
 267   {"36", "16QAM 3/4"},
 268   {"48", "64QAM 2/3"},
 269   {"54", "64QAM 3/4"},
 270   {"60", "64QAM 5/6"}
 271 };
 272
 273 #define MCS_INDEX_PER_STREAM    (8)
 274
 275 static inline u8 rs_extract_rate(u32 rate_n_flags)
 276 {
 277         return (u8)(rate_n_flags & 0xFF);
 278 }
 279
 280 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 281 {
 282         window->data = 0;
 283         window->success_counter = 0;
 284         window->success_ratio = IWL_INVALID_VALUE;
 285         window->counter = 0;
 286         window->average_tpt = IWL_INVALID_VALUE;
 287         window->stamp = 0;
 288 }
 289
 290 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 291 {
 292         return (ant_type & valid_antenna) == ant_type;
 293 }
 294
 295 /*
 296  *      removes the old data from the statistics. All data that is older than
 297  *      TID_MAX_TIME_DIFF, will be deleted.
 298  */
 299 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 300 {
 301         /* The oldest age we want to keep */
 302         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 303
 304         while (tl->queue_count &&
 305                (tl->time_stamp < oldest_time)) {
 306                 tl->total -= tl->packet_count[tl->head];
 307                 tl->packet_count[tl->head] = 0;
 308                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 309                 tl->queue_count--;
 310                 tl->head++;
 311                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 312                         tl->head = 0;
 313         }
 314 }
 315
 316 /*
 317  *      increment traffic load value for tid and also remove
 318  *      any old values if passed the certain time period
 319  */
 320 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 321                            struct ieee80211_hdr *hdr)
 322 {
 323         u32 curr_time = jiffies_to_msecs(jiffies);
 324         u32 time_diff;
 325         s32 index;
 326         struct iwl_traffic_load *tl = NULL;
 327         u8 tid;
 328
 329         if (ieee80211_is_data_qos(hdr->frame_control)) {
 330                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 331                 tid = qc[0] & 0xf;
 332         } else
 333                 return MAX_TID_COUNT;
 334
 335         if (unlikely(tid >= TID_MAX_LOAD_COUNT))
 336                 return MAX_TID_COUNT;
 337
 338         tl = &lq_data->load[tid];
 339
 340         curr_time -= curr_time % TID_ROUND_VALUE;
 341
 342         /* Happens only for the first packet. Initialize the data */
 343         if (!(tl->queue_count)) {
 344                 tl->total = 1;
 345                 tl->time_stamp = curr_time;
 346                 tl->queue_count = 1;
 347                 tl->head = 0;
 348                 tl->packet_count[0] = 1;
 349                 return MAX_TID_COUNT;
 350         }
 351
 352         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 353         index = time_diff / TID_QUEUE_CELL_SPACING;
 354
 355         /* The history is too long: remove data that is older than */
 356         /* TID_MAX_TIME_DIFF */
 357         if (index >= TID_QUEUE_MAX_SIZE)
 358                 rs_tl_rm_old_stats(tl, curr_time);
 359
 360         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 361         tl->packet_count[index] = tl->packet_count[index] + 1;
 362         tl->total = tl->total + 1;
 363
 364         if ((index + 1) > tl->queue_count)
 365                 tl->queue_count = index + 1;
 366
 367         return tid;
 368 }
 369
 370 /*
 371         get the traffic load value for tid
 372 */
 373 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 374 {
 375         u32 curr_time = jiffies_to_msecs(jiffies);
 376         u32 time_diff;
 377         s32 index;
 378         struct iwl_traffic_load *tl = NULL;
 379
 380         if (tid >= TID_MAX_LOAD_COUNT)
 381                 return 0;
 382
 383         tl = &(lq_data->load[tid]);
 384
 385         curr_time -= curr_time % TID_ROUND_VALUE;
 386
 387         if (!(tl->queue_count))
 388                 return 0;
 389
 390         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 391         index = time_diff / TID_QUEUE_CELL_SPACING;
 392
 393         /* The history is too long: remove data that is older than */
 394         /* TID_MAX_TIME_DIFF */
 395         if (index >= TID_QUEUE_MAX_SIZE)
 396                 rs_tl_rm_old_stats(tl, curr_time);
 397
 398         return tl->total;
 399 }
 400
 401 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 402                                       struct iwl_lq_sta *lq_data, u8 tid,
 403                                       struct ieee80211_sta *sta)
 404 {
 405         if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
 406                 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
 407                                 sta->addr, tid);
 408                 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
 409         }
 410 }
 411
 412 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 413                               struct iwl_lq_sta *lq_data,
 414                               struct ieee80211_sta *sta)
 415 {
 416         if ((tid < TID_MAX_LOAD_COUNT))
 417                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 418         else if (tid == IWL_AGG_ALL_TID)
 419                 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
 420                         rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 421 }
 422
 423 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 424 {
 425         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 426                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 427                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 428 }
 429
 430 /**
 431  * rs_collect_tx_data - Update the success/failure sliding window
 432  *
 433  * We keep a sliding window of the last 62 packets transmitted
 434  * at this rate.  window->data contains the bitmask of successful
 435  * packets.
 436  */
 437 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
 438                               int scale_index, s32 tpt, int retries,
 439                               int successes)
 440 {
 441         struct iwl_rate_scale_data *window = NULL;
 442         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 443         s32 fail_count;
 444
 445         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 446                 return -EINVAL;
 447
 448         /* Select data for current tx bit rate */
 449         window = &(windows[scale_index]);
 450
 451         /*
 452          * Keep track of only the latest 62 tx frame attempts in this rate's
 453          * history window; anything older isn't really relevant any more.
 454          * If we have filled up the sliding window, drop the oldest attempt;
 455          * if the oldest attempt (highest bit in bitmap) shows "success",
 456          * subtract "1" from the success counter (this is the main reason
 457          * we keep these bitmaps!).
 458          */
 459         while (retries > 0) {
 460                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 461
 462                         /* remove earliest */
 463                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 464
 465                         if (window->data & mask) {
 466                                 window->data &= ~mask;
 467                                 window->success_counter--;
 468                         }
 469                 }
 470
 471                 /* Increment frames-attempted counter */
 472                 window->counter++;
 473
 474                 /* Shift bitmap by one frame (throw away oldest history),
 475                  * OR in "1", and increment "success" if this
 476                  * frame was successful. */
 477                 window->data <<= 1;
 478                 if (successes > 0) {
 479                         window->success_counter++;
 480                         window->data |= 0x1;
 481                         successes--;
 482                 }
 483
 484                 retries--;
 485         }
 486
 487         /* Calculate current success ratio, avoid divide-by-0! */
 488         if (window->counter > 0)
 489                 window->success_ratio = 128 * (100 * window->success_counter)
 490                                         / window->counter;
 491         else
 492                 window->success_ratio = IWL_INVALID_VALUE;
 493
 494         fail_count = window->counter - window->success_counter;
 495
 496         /* Calculate average throughput, if we have enough history. */
 497         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 498             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 499                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 500         else
 501                 window->average_tpt = IWL_INVALID_VALUE;
 502
 503         /* Tag this window as having been updated */
 504         window->stamp = jiffies;
 505
 506         return 0;
 507 }
 508
 509 /*
 510  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 511  */
 512 /* FIXME:RS:remove this function and put the flags statically in the table */
 513 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
 514                                  struct iwl_scale_tbl_info *tbl,
 515                                  int index, u8 use_green)
 516 {
 517         u32 rate_n_flags = 0;
 518
 519         if (is_legacy(tbl->lq_type)) {
 520                 rate_n_flags = iwl_rates[index].plcp;
 521                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 522                         rate_n_flags |= RATE_MCS_CCK_MSK;
 523
 524         } else if (is_Ht(tbl->lq_type)) {
 525                 if (index > IWL_LAST_OFDM_RATE) {
 526                         IWL_ERR(priv, "Invalid HT rate index %d\n", index);
 527                         index = IWL_LAST_OFDM_RATE;
 528                 }
 529                 rate_n_flags = RATE_MCS_HT_MSK;
 530
 531                 if (is_siso(tbl->lq_type))
 532                         rate_n_flags |= iwl_rates[index].plcp_siso;
 533                 else if (is_mimo2(tbl->lq_type))
 534                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 535                 else
 536                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 537         } else {
 538                 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 539         }
 540
 541         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 542                                                      RATE_MCS_ANT_ABC_MSK);
 543
 544         if (is_Ht(tbl->lq_type)) {
 545                 if (tbl->is_ht40) {
 546                         if (tbl->is_dup)
 547                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 548                         else
 549                                 rate_n_flags |= RATE_MCS_HT40_MSK;
 550                 }
 551                 if (tbl->is_SGI)
 552                         rate_n_flags |= RATE_MCS_SGI_MSK;
 553
 554                 if (use_green) {
 555                         rate_n_flags |= RATE_MCS_GF_MSK;
 556                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 557                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 558                                 IWL_ERR(priv, "GF was set with SGI:SISO\n");
 559                         }
 560                 }
 561         }
 562         return rate_n_flags;
 563 }
 564
 565 /*
 566  * Interpret uCode API's rate_n_flags format,
 567  * fill "search" or "active" tx mode table.
 568  */
 569 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 570                                     enum ieee80211_band band,
 571                                     struct iwl_scale_tbl_info *tbl,
 572                                     int *rate_idx)
 573 {
 574         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 575         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 576         u8 mcs;
 577
 578         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 579
 580         if (*rate_idx  == IWL_RATE_INVALID) {
 581                 *rate_idx = -1;
 582                 return -EINVAL;
 583         }
 584         tbl->is_SGI = 0;        /* default legacy setup */
 585         tbl->is_ht40 = 0;
 586         tbl->is_dup = 0;
 587         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 588         tbl->lq_type = LQ_NONE;
 589         tbl->max_search = IWL_MAX_SEARCH;
 590
 591         /* legacy rate format */
 592         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 593                 if (num_of_ant == 1) {
 594                         if (band == IEEE80211_BAND_5GHZ)
 595                                 tbl->lq_type = LQ_A;
 596                         else
 597                                 tbl->lq_type = LQ_G;
 598                 }
 599         /* HT rate format */
 600         } else {
 601                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 602                         tbl->is_SGI = 1;
 603
 604                 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
 605                     (rate_n_flags & RATE_MCS_DUP_MSK))
 606                         tbl->is_ht40 = 1;
 607
 608                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 609                         tbl->is_dup = 1;
 610
 611                 mcs = rs_extract_rate(rate_n_flags);
 612
 613                 /* SISO */
 614                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 615                         if (num_of_ant == 1)
 616                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 617                 /* MIMO2 */
 618                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 619                         if (num_of_ant == 2)
 620                                 tbl->lq_type = LQ_MIMO2;
 621                 /* MIMO3 */
 622                 } else {
 623                         if (num_of_ant == 3) {
 624                                 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
 625                                 tbl->lq_type = LQ_MIMO3;
 626                         }
 627                 }
 628         }
 629         return 0;
 630 }
 631
 632 /* switch to another antenna/antennas and return 1 */
 633 /* if no other valid antenna found, return 0 */
 634 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 635                              struct iwl_scale_tbl_info *tbl)
 636 {
 637         u8 new_ant_type;
 638
 639         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 640                 return 0;
 641
 642         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 643                 return 0;
 644
 645         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 646
 647         while ((new_ant_type != tbl->ant_type) &&
 648                !rs_is_valid_ant(valid_ant, new_ant_type))
 649                 new_ant_type = ant_toggle_lookup[new_ant_type];
 650
 651         if (new_ant_type == tbl->ant_type)
 652                 return 0;
 653
 654         tbl->ant_type = new_ant_type;
 655         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 656         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 657         return 1;
 658 }
 659
 660 /* in 4965 we don't use greenfield at all */
 661 static inline u8 rs_use_green(struct iwl_priv *priv,
 662                               struct ieee80211_conf *conf)
 663 {
 664         u8 is_green;
 665
 666         if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
 667                 is_green = 0;
 668         else
 669                 is_green = (conf_is_ht(conf) &&
 670                            priv->current_ht_config.is_green_field &&
 671                            !priv->current_ht_config.non_GF_STA_present);
 672         return is_green;
 673 }
 674
 675 /**
 676  * rs_get_supported_rates - get the available rates
 677  *
 678  * if management frame or broadcast frame only return
 679  * basic available rates.
 680  *
 681  */
 682 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 683                                   struct ieee80211_hdr *hdr,
 684                                   enum iwl_table_type rate_type)
 685 {
 686         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
 687             lq_sta->active_rate_basic)
 688                 return lq_sta->active_rate_basic;
 689
 690         if (is_legacy(rate_type)) {
 691                 return lq_sta->active_legacy_rate;
 692         } else {
 693                 if (is_siso(rate_type))
 694                         return lq_sta->active_siso_rate;
 695                 else if (is_mimo2(rate_type))
 696                         return lq_sta->active_mimo2_rate;
 697                 else
 698                         return lq_sta->active_mimo3_rate;
 699         }
 700 }
 701
 702 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 703                                 int rate_type)
 704 {
 705         u8 high = IWL_RATE_INVALID;
 706         u8 low = IWL_RATE_INVALID;
 707
 708         /* 802.11A or ht walks to the next literal adjacent rate in
 709          * the rate table */
 710         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 711                 int i;
 712                 u32 mask;
 713
 714                 /* Find the previous rate that is in the rate mask */
 715                 i = index - 1;
 716                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 717                         if (rate_mask & mask) {
 718                                 low = i;
 719                                 break;
 720                         }
 721                 }
 722
 723                 /* Find the next rate that is in the rate mask */
 724                 i = index + 1;
 725                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 726                         if (rate_mask & mask) {
 727                                 high = i;
 728                                 break;
 729                         }
 730                 }
 731
 732                 return (high << 8) | low;
 733         }
 734
 735         low = index;
 736         while (low != IWL_RATE_INVALID) {
 737                 low = iwl_rates[low].prev_rs;
 738                 if (low == IWL_RATE_INVALID)
 739                         break;
 740                 if (rate_mask & (1 << low))
 741                         break;
 742                 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
 743         }
 744
 745         high = index;
 746         while (high != IWL_RATE_INVALID) {
 747                 high = iwl_rates[high].next_rs;
 748                 if (high == IWL_RATE_INVALID)
 749                         break;
 750                 if (rate_mask & (1 << high))
 751                         break;
 752                 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
 753         }
 754
 755         return (high << 8) | low;
 756 }
 757
 758 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 759                              struct iwl_scale_tbl_info *tbl,
 760                              u8 scale_index, u8 ht_possible)
 761 {
 762         s32 low;
 763         u16 rate_mask;
 764         u16 high_low;
 765         u8 switch_to_legacy = 0;
 766         u8 is_green = lq_sta->is_green;
 767
 768         /* check if we need to switch from HT to legacy rates.
 769          * assumption is that mandatory rates (1Mbps or 6Mbps)
 770          * are always supported (spec demand) */
 771         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 772                 switch_to_legacy = 1;
 773                 scale_index = rs_ht_to_legacy[scale_index];
 774                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 775                         tbl->lq_type = LQ_A;
 776                 else
 777                         tbl->lq_type = LQ_G;
 778
 779                 if (num_of_ant(tbl->ant_type) > 1)
 780                         tbl->ant_type = ANT_A;/*FIXME:RS*/
 781
 782                 tbl->is_ht40 = 0;
 783                 tbl->is_SGI = 0;
 784                 tbl->max_search = IWL_MAX_SEARCH;
 785         }
 786
 787         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 788
 789         /* Mask with station rate restriction */
 790         if (is_legacy(tbl->lq_type)) {
 791                 /* supp_rates has no CCK bits in A mode */
 792                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 793                         rate_mask  = (u16)(rate_mask &
 794                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 795                 else
 796                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 797         }
 798
 799         /* If we switched from HT to legacy, check current rate */
 800         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 801                 low = scale_index;
 802                 goto out;
 803         }
 804
 805         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 806                                         tbl->lq_type);
 807         low = high_low & 0xff;
 808
 809         if (low == IWL_RATE_INVALID)
 810                 low = scale_index;
 811
 812 out:
 813         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 814 }
 815
 816 /*
 817  * mac80211 sends us Tx status
 818  */
 819 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 820                          struct ieee80211_sta *sta, void *priv_sta,
 821                          struct sk_buff *skb)
 822 {
 823         int status;
 824         u8 retries;
 825         int rs_index, index = 0;
 826         struct iwl_lq_sta *lq_sta = priv_sta;
 827         struct iwl_link_quality_cmd *table;
 828         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 829         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
 830         struct ieee80211_hw *hw = priv->hw;
 831         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 832         struct iwl_rate_scale_data *window = NULL;
 833         struct iwl_rate_scale_data *search_win = NULL;
 834         u32 tx_rate;
 835         struct iwl_scale_tbl_info tbl_type;
 836         struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
 837         u8 active_index = 0;
 838         s32 tpt = 0;
 839
 840         IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
 841
 842         if (!ieee80211_is_data(hdr->frame_control) ||
 843             info->flags & IEEE80211_TX_CTL_NO_ACK)
 844                 return;
 845
 846         /* This packet was aggregated but doesn't carry rate scale info */
 847         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 848             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 849                 return;
 850
 851         if (info->flags & IEEE80211_TX_STAT_AMPDU)
 852                 retries = 0;
 853         else
 854                 retries = info->status.rates[0].count - 1;
 855
 856         if (retries > 15)
 857                 retries = 15;
 858
 859         if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
 860             !lq_sta->ibss_sta_added)
 861                 goto out;
 862
 863         table = &lq_sta->lq;
 864         active_index = lq_sta->active_tbl;
 865
 866         curr_tbl = &(lq_sta->lq_info[active_index]);
 867         search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
 868         window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
 869         search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
 870
 871         /*
 872          * Ignore this Tx frame response if its initial rate doesn't match
 873          * that of latest Link Quality command.  There may be stragglers
 874          * from a previous Link Quality command, but we're no longer interested
 875          * in those; they're either from the "active" mode while we're trying
 876          * to check "search" mode, or a prior "search" mode after we've moved
 877          * to a new "search" mode (which might become the new "active" mode).
 878          */
 879         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 880         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 881         if (priv->band == IEEE80211_BAND_5GHZ)
 882                 rs_index -= IWL_FIRST_OFDM_RATE;
 883
 884         if ((info->status.rates[0].idx < 0) ||
 885             (tbl_type.is_SGI != !!(info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)) ||
 886             (tbl_type.is_ht40 != !!(info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 887             (tbl_type.is_dup != !!(info->status.rates[0].flags & IEEE80211_TX_RC_DUP_DATA)) ||
 888             (tbl_type.ant_type != info->antenna_sel_tx) ||
 889             (!!(tx_rate & RATE_MCS_HT_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) ||
 890             (!!(tx_rate & RATE_MCS_GF_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 891             (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
 892              hw->wiphy->bands[info->band]->bitrates[info->status.rates[0].idx].bitrate)) {
 893                 IWL_DEBUG_RATE(priv, "initial rate does not match 0x%x\n", tx_rate);
 894                 /* the last LQ command could failed so the LQ in ucode not
 895                  * the same in driver sync up
 896                  */
 897                 lq_sta->missed_rate_counter++;
 898                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 899                         lq_sta->missed_rate_counter = 0;
 900                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
 901                 }
 902                 goto out;
 903         }
 904
 905         lq_sta->missed_rate_counter = 0;
 906         /* Update frame history window with "failure" for each Tx retry. */
 907         while (retries) {
 908                 /* Look up the rate and other info used for each tx attempt.
 909                  * Each tx attempt steps one entry deeper in the rate table. */
 910                 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 911                 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
 912                                           &tbl_type, &rs_index);
 913
 914                 /* If type matches "search" table,
 915                  * add failure to "search" history */
 916                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 917                     (tbl_type.ant_type == search_tbl->ant_type) &&
 918                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 919                         if (search_tbl->expected_tpt)
 920                                 tpt = search_tbl->expected_tpt[rs_index];
 921                         else
 922                                 tpt = 0;
 923                         rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
 924
 925                 /* Else if type matches "current/active" table,
 926                  * add failure to "current/active" history */
 927                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 928                            (tbl_type.ant_type == curr_tbl->ant_type) &&
 929                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 930                         if (curr_tbl->expected_tpt)
 931                                 tpt = curr_tbl->expected_tpt[rs_index];
 932                         else
 933                                 tpt = 0;
 934                         rs_collect_tx_data(window, rs_index, tpt, 1, 0);
 935                 }
 936
 937                 /* If not searching for a new mode, increment failed counter
 938                  * ... this helps determine when to start searching again */
 939                 if (lq_sta->stay_in_tbl)
 940                         lq_sta->total_failed++;
 941                 --retries;
 942                 index++;
 943
 944         }
 945
 946         /*
 947          * Find (by rate) the history window to update with final Tx attempt;
 948          * if Tx was successful first try, use original rate,
 949          * else look up the rate that was, finally, successful.
 950          */
 951         tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 952         lq_sta->last_rate_n_flags = tx_rate;
 953         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 954
 955         /* Update frame history window with "success" if Tx got ACKed ... */
 956         status = !!(info->flags & IEEE80211_TX_STAT_ACK);
 957
 958         /* If type matches "search" table,
 959          * add final tx status to "search" history */
 960         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 961             (tbl_type.ant_type == search_tbl->ant_type) &&
 962             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 963                 if (search_tbl->expected_tpt)
 964                         tpt = search_tbl->expected_tpt[rs_index];
 965                 else
 966                         tpt = 0;
 967                 if (info->flags & IEEE80211_TX_STAT_AMPDU)
 968                         rs_collect_tx_data(search_win, rs_index, tpt,
 969                                            info->status.ampdu_ack_len,
 970                                            info->status.ampdu_ack_map);
 971                 else
 972                         rs_collect_tx_data(search_win, rs_index, tpt,
 973                                            1, status);
 974         /* Else if type matches "current/active" table,
 975          * add final tx status to "current/active" history */
 976         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 977                    (tbl_type.ant_type == curr_tbl->ant_type) &&
 978                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 979                 if (curr_tbl->expected_tpt)
 980                         tpt = curr_tbl->expected_tpt[rs_index];
 981                 else
 982                         tpt = 0;
 983                 if (info->flags & IEEE80211_TX_STAT_AMPDU)
 984                         rs_collect_tx_data(window, rs_index, tpt,
 985                                            info->status.ampdu_ack_len,
 986                                            info->status.ampdu_ack_map);
 987                 else
 988                         rs_collect_tx_data(window, rs_index, tpt,
 989                                            1, status);
 990         }
 991
 992         /* If not searching for new mode, increment success/failed counter
 993          * ... these help determine when to start searching again */
 994         if (lq_sta->stay_in_tbl) {
 995                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
 996                         lq_sta->total_success += info->status.ampdu_ack_map;
 997                         lq_sta->total_failed +=
 998                              (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
 999                 } else {
1000                         if (status)
1001                                 lq_sta->total_success++;
1002                         else
1003                                 lq_sta->total_failed++;
1004                 }
1005         }
1006
1007         /* See if there's a better rate or modulation mode to try. */
1008         if (sta && sta->supp_rates[sband->band])
1009                 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1010 out:
1011         return;
1012 }
1013
1014 /*
1015  * Begin a period of staying with a selected modulation mode.
1016  * Set "stay_in_tbl" flag to prevent any mode switches.
1017  * Set frame tx success limits according to legacy vs. high-throughput,
1018  * and reset overall (spanning all rates) tx success history statistics.
1019  * These control how long we stay using same modulation mode before
1020  * searching for a new mode.
1021  */
1022 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1023                                  struct iwl_lq_sta *lq_sta)
1024 {
1025         IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1026         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1027         if (is_legacy) {
1028                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1029                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1030                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1031         } else {
1032                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1033                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1034                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1035         }
1036         lq_sta->table_count = 0;
1037         lq_sta->total_failed = 0;
1038         lq_sta->total_success = 0;
1039         lq_sta->flush_timer = jiffies;
1040         lq_sta->action_counter = 0;
1041 }
1042
1043 /*
1044  * Find correct throughput table for given mode of modulation
1045  */
1046 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1047                                       struct iwl_scale_tbl_info *tbl)
1048 {
1049         if (is_legacy(tbl->lq_type)) {
1050                 if (!is_a_band(tbl->lq_type))
1051                         tbl->expected_tpt = expected_tpt_G;
1052                 else
1053                         tbl->expected_tpt = expected_tpt_A;
1054         } else if (is_siso(tbl->lq_type)) {
1055                 if (tbl->is_ht40 && !lq_sta->is_dup)
1056                         if (tbl->is_SGI)
1057                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1058                         else
1059                                 tbl->expected_tpt = expected_tpt_siso40MHz;
1060                 else if (tbl->is_SGI)
1061                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1062                 else
1063                         tbl->expected_tpt = expected_tpt_siso20MHz;
1064         } else if (is_mimo2(tbl->lq_type)) {
1065                 if (tbl->is_ht40 && !lq_sta->is_dup)
1066                         if (tbl->is_SGI)
1067                                 tbl->expected_tpt = expected_tpt_mimo2_40MHzSGI;
1068                         else
1069                                 tbl->expected_tpt = expected_tpt_mimo2_40MHz;
1070                 else if (tbl->is_SGI)
1071                         tbl->expected_tpt = expected_tpt_mimo2_20MHzSGI;
1072                 else
1073                         tbl->expected_tpt = expected_tpt_mimo2_20MHz;
1074         } else if (is_mimo3(tbl->lq_type)) {
1075                 if (tbl->is_ht40 && !lq_sta->is_dup)
1076                         if (tbl->is_SGI)
1077                                 tbl->expected_tpt = expected_tpt_mimo3_40MHzSGI;
1078                         else
1079                                 tbl->expected_tpt = expected_tpt_mimo3_40MHz;
1080                 else if (tbl->is_SGI)
1081                         tbl->expected_tpt = expected_tpt_mimo3_20MHzSGI;
1082                 else
1083                         tbl->expected_tpt = expected_tpt_mimo3_20MHz;
1084         } else
1085                 tbl->expected_tpt = expected_tpt_G;
1086 }
1087
1088 /*
1089  * Find starting rate for new "search" high-throughput mode of modulation.
1090  * Goal is to find lowest expected rate (under perfect conditions) that is
1091  * above the current measured throughput of "active" mode, to give new mode
1092  * a fair chance to prove itself without too many challenges.
1093  *
1094  * This gets called when transitioning to more aggressive modulation
1095  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1096  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1097  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1098  * bit rate will typically need to increase, but not if performance was bad.
1099  */
1100 static s32 rs_get_best_rate(struct iwl_priv *priv,
1101                             struct iwl_lq_sta *lq_sta,
1102                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1103                             u16 rate_mask, s8 index)
1104 {
1105         /* "active" values */
1106         struct iwl_scale_tbl_info *active_tbl =
1107             &(lq_sta->lq_info[lq_sta->active_tbl]);
1108         s32 active_sr = active_tbl->win[index].success_ratio;
1109         s32 active_tpt = active_tbl->expected_tpt[index];
1110
1111         /* expected "search" throughput */
1112         s32 *tpt_tbl = tbl->expected_tpt;
1113
1114         s32 new_rate, high, low, start_hi;
1115         u16 high_low;
1116         s8 rate = index;
1117
1118         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1119
1120         for (; ;) {
1121                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1122                                                 tbl->lq_type);
1123
1124                 low = high_low & 0xff;
1125                 high = (high_low >> 8) & 0xff;
1126
1127                 /*
1128                  * Lower the "search" bit rate, to give new "search" mode
1129                  * approximately the same throughput as "active" if:
1130                  *
1131                  * 1) "Active" mode has been working modestly well (but not
1132                  *    great), and expected "search" throughput (under perfect
1133                  *    conditions) at candidate rate is above the actual
1134                  *    measured "active" throughput (but less than expected
1135                  *    "active" throughput under perfect conditions).
1136                  * OR
1137                  * 2) "Active" mode has been working perfectly or very well
1138                  *    and expected "search" throughput (under perfect
1139                  *    conditions) at candidate rate is above expected
1140                  *    "active" throughput (under perfect conditions).
1141                  */
1142                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1143                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1144                       (active_sr <= IWL_RATE_HIGH_TH) &&
1145                       (tpt_tbl[rate] <= active_tpt))) ||
1146                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1147                      (tpt_tbl[rate] > active_tpt))) {
1148
1149                         /* (2nd or later pass)
1150                          * If we've already tried to raise the rate, and are
1151                          * now trying to lower it, use the higher rate. */
1152                         if (start_hi != IWL_RATE_INVALID) {
1153                                 new_rate = start_hi;
1154                                 break;
1155                         }
1156
1157                         new_rate = rate;
1158
1159                         /* Loop again with lower rate */
1160                         if (low != IWL_RATE_INVALID)
1161                                 rate = low;
1162
1163                         /* Lower rate not available, use the original */
1164                         else
1165                                 break;
1166
1167                 /* Else try to raise the "search" rate to match "active" */
1168                 } else {
1169                         /* (2nd or later pass)
1170                          * If we've already tried to lower the rate, and are
1171                          * now trying to raise it, use the lower rate. */
1172                         if (new_rate != IWL_RATE_INVALID)
1173                                 break;
1174
1175                         /* Loop again with higher rate */
1176                         else if (high != IWL_RATE_INVALID) {
1177                                 start_hi = high;
1178                                 rate = high;
1179
1180                         /* Higher rate not available, use the original */
1181                         } else {
1182                                 new_rate = rate;
1183                                 break;
1184                         }
1185                 }
1186         }
1187
1188         return new_rate;
1189 }
1190
1191 /*
1192  * Set up search table for MIMO2
1193  */
1194 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1195                              struct iwl_lq_sta *lq_sta,
1196                              struct ieee80211_conf *conf,
1197                              struct ieee80211_sta *sta,
1198                              struct iwl_scale_tbl_info *tbl, int index)
1199 {
1200         u16 rate_mask;
1201         s32 rate;
1202         s8 is_green = lq_sta->is_green;
1203
1204         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1205                 return -1;
1206
1207         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1208                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1209                 return -1;
1210
1211         /* Need both Tx chains/antennas to support MIMO */
1212         if (priv->hw_params.tx_chains_num < 2)
1213                 return -1;
1214
1215         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1216
1217         tbl->lq_type = LQ_MIMO2;
1218         tbl->is_dup = lq_sta->is_dup;
1219         tbl->action = 0;
1220         tbl->max_search = IWL_MAX_SEARCH;
1221         rate_mask = lq_sta->active_mimo2_rate;
1222
1223         if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1224                 tbl->is_ht40 = 1;
1225         else
1226                 tbl->is_ht40 = 0;
1227
1228         /* FIXME: - don't toggle SGI here
1229         if (tbl->is_ht40) {
1230                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1231                         tbl->is_SGI = 1;
1232                 else
1233                         tbl->is_SGI = 0;
1234         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1235                 tbl->is_SGI = 1;
1236         else
1237                 tbl->is_SGI = 0;
1238         */
1239
1240         rs_set_expected_tpt_table(lq_sta, tbl);
1241
1242         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1243
1244         IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1245         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1246                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1247                                                 rate, rate_mask);
1248                 return -1;
1249         }
1250         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1251
1252         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1253                      tbl->current_rate, is_green);
1254         return 0;
1255 }
1256
1257 /*
1258  * Set up search table for MIMO3
1259  */
1260 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1261                              struct iwl_lq_sta *lq_sta,
1262                              struct ieee80211_conf *conf,
1263                              struct ieee80211_sta *sta,
1264                              struct iwl_scale_tbl_info *tbl, int index)
1265 {
1266         u16 rate_mask;
1267         s32 rate;
1268         s8 is_green = lq_sta->is_green;
1269
1270         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1271                 return -1;
1272
1273         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1274                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1275                 return -1;
1276
1277         /* Need both Tx chains/antennas to support MIMO */
1278         if (priv->hw_params.tx_chains_num < 3)
1279                 return -1;
1280
1281         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1282
1283         tbl->lq_type = LQ_MIMO3;
1284         tbl->is_dup = lq_sta->is_dup;
1285         tbl->action = 0;
1286         tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1287         rate_mask = lq_sta->active_mimo3_rate;
1288
1289         if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1290                 tbl->is_ht40 = 1;
1291         else
1292                 tbl->is_ht40 = 0;
1293
1294         /* FIXME: - don't toggle SGI here
1295         if (tbl->is_ht40) {
1296                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1297                         tbl->is_SGI = 1;
1298                 else
1299                         tbl->is_SGI = 0;
1300         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1301                 tbl->is_SGI = 1;
1302         else
1303                 tbl->is_SGI = 0;
1304         */
1305
1306         rs_set_expected_tpt_table(lq_sta, tbl);
1307
1308         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1309
1310         IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1311                 rate, rate_mask);
1312         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1313                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1314                                                 rate, rate_mask);
1315                 return -1;
1316         }
1317         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1318
1319         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1320                      tbl->current_rate, is_green);
1321         return 0;
1322 }
1323
1324 /*
1325  * Set up search table for SISO
1326  */
1327 static int rs_switch_to_siso(struct iwl_priv *priv,
1328                              struct iwl_lq_sta *lq_sta,
1329                              struct ieee80211_conf *conf,
1330                              struct ieee80211_sta *sta,
1331                              struct iwl_scale_tbl_info *tbl, int index)
1332 {
1333         u16 rate_mask;
1334         u8 is_green = lq_sta->is_green;
1335         s32 rate;
1336
1337         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1338                 return -1;
1339
1340         IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1341
1342         tbl->is_dup = lq_sta->is_dup;
1343         tbl->lq_type = LQ_SISO;
1344         tbl->action = 0;
1345         tbl->max_search = IWL_MAX_SEARCH;
1346         rate_mask = lq_sta->active_siso_rate;
1347
1348         if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1349                 tbl->is_ht40 = 1;
1350         else
1351                 tbl->is_ht40 = 0;
1352
1353         /* FIXME: - don't toggle SGI here
1354         if (tbl->is_ht40) {
1355                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1356                         tbl->is_SGI = 1;
1357                 else
1358                         tbl->is_SGI = 0;
1359         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1360                 tbl->is_SGI = 1;
1361         else
1362                 tbl->is_SGI = 0;
1363         */
1364
1365         if (is_green)
1366                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1367
1368         rs_set_expected_tpt_table(lq_sta, tbl);
1369         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1370
1371         IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1372         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1373                 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1374                              rate, rate_mask);
1375                 return -1;
1376         }
1377         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1378         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1379                      tbl->current_rate, is_green);
1380         return 0;
1381 }
1382
1383 /*
1384  * Try to switch to new modulation mode from legacy
1385  */
1386 static int rs_move_legacy_other(struct iwl_priv *priv,
1387                                 struct iwl_lq_sta *lq_sta,
1388                                 struct ieee80211_conf *conf,
1389                                 struct ieee80211_sta *sta,
1390                                 int index)
1391 {
1392         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1393         struct iwl_scale_tbl_info *search_tbl =
1394                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1395         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1396         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1397                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1398         u8 start_action = tbl->action;
1399         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1400         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1401         int ret = 0;
1402         u8 update_search_tbl_counter = 0;
1403
1404         if (!iwl_ht_enabled(priv))
1405                 /* stay in Legacy */
1406                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1407         else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1408                    tbl->action > IWL_LEGACY_SWITCH_SISO)
1409                 tbl->action = IWL_LEGACY_SWITCH_SISO;
1410         for (; ;) {
1411                 lq_sta->action_counter++;
1412                 switch (tbl->action) {
1413                 case IWL_LEGACY_SWITCH_ANTENNA1:
1414                 case IWL_LEGACY_SWITCH_ANTENNA2:
1415                         IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1416
1417                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1418                                                         tx_chains_num <= 1) ||
1419                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1420                                                         tx_chains_num <= 2))
1421                                 break;
1422
1423                         /* Don't change antenna if success has been great */
1424                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1425                                 break;
1426
1427                         /* Set up search table to try other antenna */
1428                         memcpy(search_tbl, tbl, sz);
1429
1430                         if (rs_toggle_antenna(valid_tx_ant,
1431                                 &search_tbl->current_rate, search_tbl)) {
1432                                 update_search_tbl_counter = 1;
1433                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1434                                 goto out;
1435                         }
1436                         break;
1437                 case IWL_LEGACY_SWITCH_SISO:
1438                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1439
1440                         /* Set up search table to try SISO */
1441                         memcpy(search_tbl, tbl, sz);
1442                         search_tbl->is_SGI = 0;
1443                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1444                                                  search_tbl, index);
1445                         if (!ret) {
1446                                 lq_sta->action_counter = 0;
1447                                 goto out;
1448                         }
1449
1450                         break;
1451                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1452                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1453                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1454                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1455
1456                         /* Set up search table to try MIMO */
1457                         memcpy(search_tbl, tbl, sz);
1458                         search_tbl->is_SGI = 0;
1459
1460                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1461                                 search_tbl->ant_type = ANT_AB;
1462                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1463                                 search_tbl->ant_type = ANT_AC;
1464                         else
1465                                 search_tbl->ant_type = ANT_BC;
1466
1467                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1468                                 break;
1469
1470                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1471                                                  search_tbl, index);
1472                         if (!ret) {
1473                                 lq_sta->action_counter = 0;
1474                                 goto out;
1475                         }
1476                         break;
1477
1478                 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1479                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1480
1481                         /* Set up search table to try MIMO3 */
1482                         memcpy(search_tbl, tbl, sz);
1483                         search_tbl->is_SGI = 0;
1484
1485                         search_tbl->ant_type = ANT_ABC;
1486
1487                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1488                                 break;
1489
1490                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1491                                                  search_tbl, index);
1492                         if (!ret) {
1493                                 lq_sta->action_counter = 0;
1494                                 goto out;
1495                         }
1496                         break;
1497                 }
1498                 tbl->action++;
1499                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1500                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1501
1502                 if (tbl->action == start_action)
1503                         break;
1504
1505         }
1506         search_tbl->lq_type = LQ_NONE;
1507         return 0;
1508
1509 out:
1510         lq_sta->search_better_tbl = 1;
1511         tbl->action++;
1512         if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1513                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1514         if (update_search_tbl_counter)
1515                 search_tbl->action = tbl->action;
1516         return 0;
1517
1518 }
1519
1520 /*
1521  * Try to switch to new modulation mode from SISO
1522  */
1523 static int rs_move_siso_to_other(struct iwl_priv *priv,
1524                                  struct iwl_lq_sta *lq_sta,
1525                                  struct ieee80211_conf *conf,
1526                                  struct ieee80211_sta *sta, int index)
1527 {
1528         u8 is_green = lq_sta->is_green;
1529         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1530         struct iwl_scale_tbl_info *search_tbl =
1531                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1532         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1533         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1534                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1535         u8 start_action = tbl->action;
1536         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1537         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1538         u8 update_search_tbl_counter = 0;
1539         int ret;
1540
1541         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1542             tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1543                 /* stay in SISO */
1544                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1545         }
1546         for (;;) {
1547                 lq_sta->action_counter++;
1548                 switch (tbl->action) {
1549                 case IWL_SISO_SWITCH_ANTENNA1:
1550                 case IWL_SISO_SWITCH_ANTENNA2:
1551                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1552
1553                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1554                                                         tx_chains_num <= 1) ||
1555                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1556                                                         tx_chains_num <= 2))
1557                                 break;
1558
1559                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1560                                 break;
1561
1562                         memcpy(search_tbl, tbl, sz);
1563                         if (rs_toggle_antenna(valid_tx_ant,
1564                                        &search_tbl->current_rate, search_tbl)) {
1565                                 update_search_tbl_counter = 1;
1566                                 goto out;
1567                         }
1568                         break;
1569                 case IWL_SISO_SWITCH_MIMO2_AB:
1570                 case IWL_SISO_SWITCH_MIMO2_AC:
1571                 case IWL_SISO_SWITCH_MIMO2_BC:
1572                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1573                         memcpy(search_tbl, tbl, sz);
1574                         search_tbl->is_SGI = 0;
1575
1576                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1577                                 search_tbl->ant_type = ANT_AB;
1578                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1579                                 search_tbl->ant_type = ANT_AC;
1580                         else
1581                                 search_tbl->ant_type = ANT_BC;
1582
1583                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1584                                 break;
1585
1586                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1587                                                  search_tbl, index);
1588                         if (!ret)
1589                                 goto out;
1590                         break;
1591                 case IWL_SISO_SWITCH_GI:
1592                         if (!tbl->is_ht40 &&
1593                                 !(priv->current_ht_config.sgf &
1594                                                 HT_SHORT_GI_20MHZ))
1595                                 break;
1596                         if (tbl->is_ht40 &&
1597                                 !(priv->current_ht_config.sgf &
1598                                                 HT_SHORT_GI_40MHZ))
1599                                 break;
1600
1601                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1602
1603                         memcpy(search_tbl, tbl, sz);
1604                         if (is_green) {
1605                                 if (!tbl->is_SGI)
1606                                         break;
1607                                 else
1608                                         IWL_ERR(priv,
1609                                                 "SGI was set in GF+SISO\n");
1610                         }
1611                         search_tbl->is_SGI = !tbl->is_SGI;
1612                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1613                         if (tbl->is_SGI) {
1614                                 s32 tpt = lq_sta->last_tpt / 100;
1615                                 if (tpt >= search_tbl->expected_tpt[index])
1616                                         break;
1617                         }
1618                         search_tbl->current_rate =
1619                                 rate_n_flags_from_tbl(priv, search_tbl,
1620                                                       index, is_green);
1621                         update_search_tbl_counter = 1;
1622                         goto out;
1623                 case IWL_SISO_SWITCH_MIMO3_ABC:
1624                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1625                         memcpy(search_tbl, tbl, sz);
1626                         search_tbl->is_SGI = 0;
1627                         search_tbl->ant_type = ANT_ABC;
1628
1629                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1630                                 break;
1631
1632                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1633                                                  search_tbl, index);
1634                         if (!ret)
1635                                 goto out;
1636                         break;
1637                 }
1638                 tbl->action++;
1639                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1640                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1641
1642                 if (tbl->action == start_action)
1643                         break;
1644         }
1645         search_tbl->lq_type = LQ_NONE;
1646         return 0;
1647
1648  out:
1649         lq_sta->search_better_tbl = 1;
1650         tbl->action++;
1651         if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1652                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1653         if (update_search_tbl_counter)
1654                 search_tbl->action = tbl->action;
1655
1656         return 0;
1657 }
1658
1659 /*
1660  * Try to switch to new modulation mode from MIMO2
1661  */
1662 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1663                                  struct iwl_lq_sta *lq_sta,
1664                                  struct ieee80211_conf *conf,
1665                                  struct ieee80211_sta *sta, int index)
1666 {
1667         s8 is_green = lq_sta->is_green;
1668         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1669         struct iwl_scale_tbl_info *search_tbl =
1670                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1671         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1672         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1673                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1674         u8 start_action = tbl->action;
1675         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1676         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1677         u8 update_search_tbl_counter = 0;
1678         int ret;
1679
1680         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1681             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1682              tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1683                 /* switch in SISO */
1684                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1685         }
1686         for (;;) {
1687                 lq_sta->action_counter++;
1688                 switch (tbl->action) {
1689                 case IWL_MIMO2_SWITCH_ANTENNA1:
1690                 case IWL_MIMO2_SWITCH_ANTENNA2:
1691                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1692
1693                         if (tx_chains_num <= 2)
1694                                 break;
1695
1696                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1697                                 break;
1698
1699                         memcpy(search_tbl, tbl, sz);
1700                         if (rs_toggle_antenna(valid_tx_ant,
1701                                        &search_tbl->current_rate, search_tbl)) {
1702                                 update_search_tbl_counter = 1;
1703                                 goto out;
1704                         }
1705                         break;
1706                 case IWL_MIMO2_SWITCH_SISO_A:
1707                 case IWL_MIMO2_SWITCH_SISO_B:
1708                 case IWL_MIMO2_SWITCH_SISO_C:
1709                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1710
1711                         /* Set up new search table for SISO */
1712                         memcpy(search_tbl, tbl, sz);
1713
1714                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1715                                 search_tbl->ant_type = ANT_A;
1716                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1717                                 search_tbl->ant_type = ANT_B;
1718                         else
1719                                 search_tbl->ant_type = ANT_C;
1720
1721                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1722                                 break;
1723
1724                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1725                                                  search_tbl, index);
1726                         if (!ret)
1727                                 goto out;
1728
1729                         break;
1730
1731                 case IWL_MIMO2_SWITCH_GI:
1732                         if (!tbl->is_ht40 &&
1733                                 !(priv->current_ht_config.sgf &
1734                                                 HT_SHORT_GI_20MHZ))
1735                                 break;
1736                         if (tbl->is_ht40 &&
1737                                 !(priv->current_ht_config.sgf &
1738                                                 HT_SHORT_GI_40MHZ))
1739                                 break;
1740
1741                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1742
1743                         /* Set up new search table for MIMO2 */
1744                         memcpy(search_tbl, tbl, sz);
1745                         search_tbl->is_SGI = !tbl->is_SGI;
1746                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1747                         /*
1748                          * If active table already uses the fastest possible
1749                          * modulation (dual stream with short guard interval),
1750                          * and it's working well, there's no need to look
1751                          * for a better type of modulation!
1752                          */
1753                         if (tbl->is_SGI) {
1754                                 s32 tpt = lq_sta->last_tpt / 100;
1755                                 if (tpt >= search_tbl->expected_tpt[index])
1756                                         break;
1757                         }
1758                         search_tbl->current_rate =
1759                                 rate_n_flags_from_tbl(priv, search_tbl,
1760                                                       index, is_green);
1761                         update_search_tbl_counter = 1;
1762                         goto out;
1763
1764                 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1765                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1766                         memcpy(search_tbl, tbl, sz);
1767                         search_tbl->is_SGI = 0;
1768                         search_tbl->ant_type = ANT_ABC;
1769
1770                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1771                                 break;
1772
1773                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1774                                                  search_tbl, index);
1775                         if (!ret)
1776                                 goto out;
1777
1778                         break;
1779                 }
1780                 tbl->action++;
1781                 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1782                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1783
1784                 if (tbl->action == start_action)
1785                         break;
1786         }
1787         search_tbl->lq_type = LQ_NONE;
1788         return 0;
1789  out:
1790         lq_sta->search_better_tbl = 1;
1791         tbl->action++;
1792         if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1793                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1794         if (update_search_tbl_counter)
1795                 search_tbl->action = tbl->action;
1796
1797         return 0;
1798
1799 }
1800
1801 /*
1802  * Try to switch to new modulation mode from MIMO3
1803  */
1804 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1805                                  struct iwl_lq_sta *lq_sta,
1806                                  struct ieee80211_conf *conf,
1807                                  struct ieee80211_sta *sta, int index)
1808 {
1809         s8 is_green = lq_sta->is_green;
1810         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1811         struct iwl_scale_tbl_info *search_tbl =
1812                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1813         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1814         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1815                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1816         u8 start_action = tbl->action;
1817         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1818         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1819         int ret;
1820         u8 update_search_tbl_counter = 0;
1821
1822         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1823             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1824              tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1825                 /* switch in SISO */
1826                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1827         }
1828         for (;;) {
1829                 lq_sta->action_counter++;
1830                 switch (tbl->action) {
1831                 case IWL_MIMO3_SWITCH_ANTENNA1:
1832                 case IWL_MIMO3_SWITCH_ANTENNA2:
1833                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1834
1835                         if (tx_chains_num <= 3)
1836                                 break;
1837
1838                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1839                                 break;
1840
1841                         memcpy(search_tbl, tbl, sz);
1842                         if (rs_toggle_antenna(valid_tx_ant,
1843                                        &search_tbl->current_rate, search_tbl))
1844                                 goto out;
1845                         break;
1846                 case IWL_MIMO3_SWITCH_SISO_A:
1847                 case IWL_MIMO3_SWITCH_SISO_B:
1848                 case IWL_MIMO3_SWITCH_SISO_C:
1849                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1850
1851                         /* Set up new search table for SISO */
1852                         memcpy(search_tbl, tbl, sz);
1853
1854                         if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1855                                 search_tbl->ant_type = ANT_A;
1856                         else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1857                                 search_tbl->ant_type = ANT_B;
1858                         else
1859                                 search_tbl->ant_type = ANT_C;
1860
1861                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1862                                 break;
1863
1864                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1865                                                  search_tbl, index);
1866                         if (!ret)
1867                                 goto out;
1868
1869                         break;
1870
1871                 case IWL_MIMO3_SWITCH_MIMO2_AB:
1872                 case IWL_MIMO3_SWITCH_MIMO2_AC:
1873                 case IWL_MIMO3_SWITCH_MIMO2_BC:
1874                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1875
1876                         memcpy(search_tbl, tbl, sz);
1877                         search_tbl->is_SGI = 0;
1878                         if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1879                                 search_tbl->ant_type = ANT_AB;
1880                         else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1881                                 search_tbl->ant_type = ANT_AC;
1882                         else
1883                                 search_tbl->ant_type = ANT_BC;
1884
1885                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1886                                 break;
1887
1888                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1889                                                  search_tbl, index);
1890                         if (!ret)
1891                                 goto out;
1892
1893                         break;
1894
1895                 case IWL_MIMO3_SWITCH_GI:
1896                         if (!tbl->is_ht40 &&
1897                                 !(priv->current_ht_config.sgf &
1898                                                 HT_SHORT_GI_20MHZ))
1899                                 break;
1900                         if (tbl->is_ht40 &&
1901                                 !(priv->current_ht_config.sgf &
1902                                                 HT_SHORT_GI_40MHZ))
1903                                 break;
1904
1905                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1906
1907                         /* Set up new search table for MIMO */
1908                         memcpy(search_tbl, tbl, sz);
1909                         search_tbl->is_SGI = !tbl->is_SGI;
1910                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1911                         /*
1912                          * If active table already uses the fastest possible
1913                          * modulation (dual stream with short guard interval),
1914                          * and it's working well, there's no need to look
1915                          * for a better type of modulation!
1916                          */
1917                         if (tbl->is_SGI) {
1918                                 s32 tpt = lq_sta->last_tpt / 100;
1919                                 if (tpt >= search_tbl->expected_tpt[index])
1920                                         break;
1921                         }
1922                         search_tbl->current_rate =
1923                                 rate_n_flags_from_tbl(priv, search_tbl,
1924                                                       index, is_green);
1925                         update_search_tbl_counter = 1;
1926                         goto out;
1927                 }
1928                 tbl->action++;
1929                 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1930                         tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1931
1932                 if (tbl->action == start_action)
1933                         break;
1934         }
1935         search_tbl->lq_type = LQ_NONE;
1936         return 0;
1937  out:
1938         lq_sta->search_better_tbl = 1;
1939         tbl->action++;
1940         if (tbl->action > IWL_MIMO3_SWITCH_GI)
1941                 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1942         if (update_search_tbl_counter)
1943                 search_tbl->action = tbl->action;
1944
1945         return 0;
1946
1947 }
1948
1949 /*
1950  * Check whether we should continue using same modulation mode, or
1951  * begin search for a new mode, based on:
1952  * 1) # tx successes or failures while using this mode
1953  * 2) # times calling this function
1954  * 3) elapsed time in this mode (not used, for now)
1955  */
1956 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1957 {
1958         struct iwl_scale_tbl_info *tbl;
1959         int i;
1960         int active_tbl;
1961         int flush_interval_passed = 0;
1962         struct iwl_priv *priv;
1963
1964         priv = lq_sta->drv;
1965         active_tbl = lq_sta->active_tbl;
1966
1967         tbl = &(lq_sta->lq_info[active_tbl]);
1968
1969         /* If we've been disallowing search, see if we should now allow it */
1970         if (lq_sta->stay_in_tbl) {
1971
1972                 /* Elapsed time using current modulation mode */
1973                 if (lq_sta->flush_timer)
1974                         flush_interval_passed =
1975                         time_after(jiffies,
1976                                         (unsigned long)(lq_sta->flush_timer +
1977                                         IWL_RATE_SCALE_FLUSH_INTVL));
1978
1979                 /*
1980                  * Check if we should allow search for new modulation mode.
1981                  * If many frames have failed or succeeded, or we've used
1982                  * this same modulation for a long time, allow search, and
1983                  * reset history stats that keep track of whether we should
1984                  * allow a new search.  Also (below) reset all bitmaps and
1985                  * stats in active history.
1986                  */
1987                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1988                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1989                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1990                      && (flush_interval_passed))) {
1991                         IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
1992                                      lq_sta->total_failed,
1993                                      lq_sta->total_success,
1994                                      flush_interval_passed);
1995
1996                         /* Allow search for new mode */
1997                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1998                         lq_sta->total_failed = 0;
1999                         lq_sta->total_success = 0;
2000                         lq_sta->flush_timer = 0;
2001
2002                 /*
2003                  * Else if we've used this modulation mode enough repetitions
2004                  * (regardless of elapsed time or success/failure), reset
2005                  * history bitmaps and rate-specific stats for all rates in
2006                  * active table.
2007                  */
2008                 } else {
2009                         lq_sta->table_count++;
2010                         if (lq_sta->table_count >=
2011                             lq_sta->table_count_limit) {
2012                                 lq_sta->table_count = 0;
2013
2014                                 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2015                                 for (i = 0; i < IWL_RATE_COUNT; i++)
2016                                         rs_rate_scale_clear_window(
2017                                                 &(tbl->win[i]));
2018                         }
2019                 }
2020
2021                 /* If transitioning to allow "search", reset all history
2022                  * bitmaps and stats in active table (this will become the new
2023                  * "search" table). */
2024                 if (!lq_sta->stay_in_tbl) {
2025                         for (i = 0; i < IWL_RATE_COUNT; i++)
2026                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2027                 }
2028         }
2029 }
2030
2031 /*
2032  * setup rate table in uCode
2033  * return rate_n_flags as used in the table
2034  */
2035 static u32 rs_update_rate_tbl(struct iwl_priv *priv,
2036                                 struct iwl_lq_sta *lq_sta,
2037                                 struct iwl_scale_tbl_info *tbl,
2038                                 int index, u8 is_green)
2039 {
2040         u32 rate;
2041
2042         /* Update uCode's rate table. */
2043         rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2044         rs_fill_link_cmd(priv, lq_sta, rate);
2045         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2046
2047         return rate;
2048 }
2049
2050 /*
2051  * Do rate scaling and search for new modulation mode.
2052  */
2053 static void rs_rate_scale_perform(struct iwl_priv *priv,
2054                                   struct sk_buff *skb,
2055                                   struct ieee80211_sta *sta,
2056                                   struct iwl_lq_sta *lq_sta)
2057 {
2058         struct ieee80211_hw *hw = priv->hw;
2059         struct ieee80211_conf *conf = &hw->conf;
2060         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2061         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2062         int low = IWL_RATE_INVALID;
2063         int high = IWL_RATE_INVALID;
2064         int index;
2065         int i;
2066         struct iwl_rate_scale_data *window = NULL;
2067         int current_tpt = IWL_INVALID_VALUE;
2068         int low_tpt = IWL_INVALID_VALUE;
2069         int high_tpt = IWL_INVALID_VALUE;
2070         u32 fail_count;
2071         s8 scale_action = 0;
2072         u16 rate_mask;
2073         u8 update_lq = 0;
2074         struct iwl_scale_tbl_info *tbl, *tbl1;
2075         u16 rate_scale_index_msk = 0;
2076         u32 rate;
2077         u8 is_green = 0;
2078         u8 active_tbl = 0;
2079         u8 done_search = 0;
2080         u16 high_low;
2081         s32 sr;
2082         u8 tid = MAX_TID_COUNT;
2083         struct iwl_tid_data *tid_data;
2084
2085         IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2086
2087         /* Send management frames and NO_ACK data using lowest rate. */
2088         /* TODO: this could probably be improved.. */
2089         if (!ieee80211_is_data(hdr->frame_control) ||
2090             info->flags & IEEE80211_TX_CTL_NO_ACK)
2091                 return;
2092
2093         if (!sta || !lq_sta)
2094                 return;
2095
2096         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2097
2098         tid = rs_tl_add_packet(lq_sta, hdr);
2099
2100         /*
2101          * Select rate-scale / modulation-mode table to work with in
2102          * the rest of this function:  "search" if searching for better
2103          * modulation mode, or "active" if doing rate scaling within a mode.
2104          */
2105         if (!lq_sta->search_better_tbl)
2106                 active_tbl = lq_sta->active_tbl;
2107         else
2108                 active_tbl = 1 - lq_sta->active_tbl;
2109
2110         tbl = &(lq_sta->lq_info[active_tbl]);
2111         if (is_legacy(tbl->lq_type))
2112                 lq_sta->is_green = 0;
2113         else
2114                 lq_sta->is_green = rs_use_green(priv, conf);
2115         is_green = lq_sta->is_green;
2116
2117         /* current tx rate */
2118         index = lq_sta->last_txrate_idx;
2119
2120         IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2121                        tbl->lq_type);
2122
2123         /* rates available for this association, and for modulation mode */
2124         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2125
2126         IWL_DEBUG_RATE(priv, "mask 0x%04X \n", rate_mask);
2127
2128         /* mask with station rate restriction */
2129         if (is_legacy(tbl->lq_type)) {
2130                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2131                         /* supp_rates has no CCK bits in A mode */
2132                         rate_scale_index_msk = (u16) (rate_mask &
2133                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2134                 else
2135                         rate_scale_index_msk = (u16) (rate_mask &
2136                                                       lq_sta->supp_rates);
2137
2138         } else
2139                 rate_scale_index_msk = rate_mask;
2140
2141         if (!rate_scale_index_msk)
2142                 rate_scale_index_msk = rate_mask;
2143
2144         if (!((1 << index) & rate_scale_index_msk)) {
2145                 IWL_ERR(priv, "Current Rate is not valid\n");
2146                 if (lq_sta->search_better_tbl) {
2147                         /* revert to active table if search table is not valid*/
2148                         tbl->lq_type = LQ_NONE;
2149                         lq_sta->search_better_tbl = 0;
2150                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2151                         /* get "active" rate info */
2152                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2153                         rate = rs_update_rate_tbl(priv, lq_sta,
2154                                                   tbl, index, is_green);
2155                 }
2156                 return;
2157         }
2158
2159         /* Get expected throughput table and history window for current rate */
2160         if (!tbl->expected_tpt) {
2161                 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2162                 return;
2163         }
2164
2165         /* force user max rate if set by user */
2166         if ((lq_sta->max_rate_idx != -1) &&
2167             (lq_sta->max_rate_idx < index)) {
2168                 index = lq_sta->max_rate_idx;
2169                 update_lq = 1;
2170                 window = &(tbl->win[index]);
2171                 goto lq_update;
2172         }
2173
2174         window = &(tbl->win[index]);
2175
2176         /*
2177          * If there is not enough history to calculate actual average
2178          * throughput, keep analyzing results of more tx frames, without
2179          * changing rate or mode (bypass most of the rest of this function).
2180          * Set up new rate table in uCode only if old rate is not supported
2181          * in current association (use new rate found above).
2182          */
2183         fail_count = window->counter - window->success_counter;
2184         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2185                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2186                 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2187                                "for index %d\n",
2188                                window->success_counter, window->counter, index);
2189
2190                 /* Can't calculate this yet; not enough history */
2191                 window->average_tpt = IWL_INVALID_VALUE;
2192
2193                 /* Should we stay with this modulation mode,
2194                  * or search for a new one? */
2195                 rs_stay_in_table(lq_sta);
2196
2197                 goto out;
2198         }
2199
2200         /* Else we have enough samples; calculate estimate of
2201          * actual average throughput */
2202
2203         BUG_ON(window->average_tpt != ((window->success_ratio *
2204                         tbl->expected_tpt[index] + 64) / 128));
2205
2206         /* If we are searching for better modulation mode, check success. */
2207         if (lq_sta->search_better_tbl &&
2208             (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2209                 /* If good success, continue using the "search" mode;
2210                  * no need to send new link quality command, since we're
2211                  * continuing to use the setup that we've been trying. */
2212                 if (window->average_tpt > lq_sta->last_tpt) {
2213
2214                         IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2215                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2216                                         window->success_ratio,
2217                                         window->average_tpt,
2218                                         lq_sta->last_tpt);
2219
2220                         if (!is_legacy(tbl->lq_type))
2221                                 lq_sta->enable_counter = 1;
2222
2223                         /* Swap tables; "search" becomes "active" */
2224                         lq_sta->active_tbl = active_tbl;
2225                         current_tpt = window->average_tpt;
2226
2227                 /* Else poor success; go back to mode in "active" table */
2228                 } else {
2229
2230                         IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2231                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2232                                         window->success_ratio,
2233                                         window->average_tpt,
2234                                         lq_sta->last_tpt);
2235
2236                         /* Nullify "search" table */
2237                         tbl->lq_type = LQ_NONE;
2238
2239                         /* Revert to "active" table */
2240                         active_tbl = lq_sta->active_tbl;
2241                         tbl = &(lq_sta->lq_info[active_tbl]);
2242
2243                         /* Revert to "active" rate and throughput info */
2244                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2245                         current_tpt = lq_sta->last_tpt;
2246
2247                         /* Need to set up a new rate table in uCode */
2248                         update_lq = 1;
2249                 }
2250
2251                 /* Either way, we've made a decision; modulation mode
2252                  * search is done, allow rate adjustment next time. */
2253                 lq_sta->search_better_tbl = 0;
2254                 done_search = 1;        /* Don't switch modes below! */
2255                 goto lq_update;
2256         }
2257
2258         /* (Else) not in search of better modulation mode, try for better
2259          * starting rate, while staying in this mode. */
2260         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2261                                         tbl->lq_type);
2262         low = high_low & 0xff;
2263         high = (high_low >> 8) & 0xff;
2264
2265         /* If user set max rate, dont allow higher than user constrain */
2266         if ((lq_sta->max_rate_idx != -1) &&
2267             (lq_sta->max_rate_idx < high))
2268                 high = IWL_RATE_INVALID;
2269
2270         sr = window->success_ratio;
2271
2272         /* Collect measured throughputs for current and adjacent rates */
2273         current_tpt = window->average_tpt;
2274         if (low != IWL_RATE_INVALID)
2275                 low_tpt = tbl->win[low].average_tpt;
2276         if (high != IWL_RATE_INVALID)
2277                 high_tpt = tbl->win[high].average_tpt;
2278
2279         scale_action = 0;
2280
2281         /* Too many failures, decrease rate */
2282         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2283                 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2284                 scale_action = -1;
2285
2286         /* No throughput measured yet for adjacent rates; try increase. */
2287         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2288                    (high_tpt == IWL_INVALID_VALUE)) {
2289
2290                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2291                         scale_action = 1;
2292                 else if (low != IWL_RATE_INVALID)
2293                         scale_action = 0;
2294         }
2295
2296         /* Both adjacent throughputs are measured, but neither one has better
2297          * throughput; we're using the best rate, don't change it! */
2298         else if ((low_tpt != IWL_INVALID_VALUE) &&
2299                  (high_tpt != IWL_INVALID_VALUE) &&
2300                  (low_tpt < current_tpt) &&
2301                  (high_tpt < current_tpt))
2302                 scale_action = 0;
2303
2304         /* At least one adjacent rate's throughput is measured,
2305          * and may have better performance. */
2306         else {
2307                 /* Higher adjacent rate's throughput is measured */
2308                 if (high_tpt != IWL_INVALID_VALUE) {
2309                         /* Higher rate has better throughput */
2310                         if (high_tpt > current_tpt &&
2311                                         sr >= IWL_RATE_INCREASE_TH) {
2312                                 scale_action = 1;
2313                         } else {
2314                                 scale_action = 0;
2315                         }
2316
2317                 /* Lower adjacent rate's throughput is measured */
2318                 } else if (low_tpt != IWL_INVALID_VALUE) {
2319                         /* Lower rate has better throughput */
2320                         if (low_tpt > current_tpt) {
2321                                 IWL_DEBUG_RATE(priv,
2322                                     "decrease rate because of low tpt\n");
2323                                 scale_action = -1;
2324                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2325                                 scale_action = 1;
2326                         }
2327                 }
2328         }
2329
2330         /* Sanity check; asked for decrease, but success rate or throughput
2331          * has been good at old rate.  Don't change it. */
2332         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2333                     ((sr > IWL_RATE_HIGH_TH) ||
2334                      (current_tpt > (100 * tbl->expected_tpt[low]))))
2335                 scale_action = 0;
2336         if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2337                 scale_action = -1;
2338         if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2339                 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2340                 scale_action = -1;
2341         switch (scale_action) {
2342         case -1:
2343                 /* Decrease starting rate, update uCode's rate table */
2344                 if (low != IWL_RATE_INVALID) {
2345                         update_lq = 1;
2346                         index = low;
2347                 }
2348
2349                 break;
2350         case 1:
2351                 /* Increase starting rate, update uCode's rate table */
2352                 if (high != IWL_RATE_INVALID) {
2353                         update_lq = 1;
2354                         index = high;
2355                 }
2356
2357                 break;
2358         case 0:
2359                 /* No change */
2360         default:
2361                 break;
2362         }
2363
2364         IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2365                     "high %d type %d\n",
2366                      index, scale_action, low, high, tbl->lq_type);
2367
2368 lq_update:
2369         /* Replace uCode's rate table for the destination station. */
2370         if (update_lq)
2371                 rate = rs_update_rate_tbl(priv, lq_sta,
2372                                           tbl, index, is_green);
2373
2374         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2375                 /* Should we stay with this modulation mode,
2376                  * or search for a new one? */
2377                 rs_stay_in_table(lq_sta);
2378         }
2379         /*
2380          * Search for new modulation mode if we're:
2381          * 1)  Not changing rates right now
2382          * 2)  Not just finishing up a search
2383          * 3)  Allowing a new search
2384          */
2385         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2386                 /* Save current throughput to compare with "search" throughput*/
2387                 lq_sta->last_tpt = current_tpt;
2388
2389                 /* Select a new "search" modulation mode to try.
2390                  * If one is found, set up the new "search" table. */
2391                 if (is_legacy(tbl->lq_type))
2392                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2393                 else if (is_siso(tbl->lq_type))
2394                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2395                 else if (is_mimo2(tbl->lq_type))
2396                         rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2397                 else
2398                         rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2399
2400                 /* If new "search" mode was selected, set up in uCode table */
2401                 if (lq_sta->search_better_tbl) {
2402                         /* Access the "search" table, clear its history. */
2403                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2404                         for (i = 0; i < IWL_RATE_COUNT; i++)
2405                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2406
2407                         /* Use new "search" start rate */
2408                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2409
2410                         IWL_DEBUG_RATE(priv, "Switch current  mcs: %X index: %d\n",
2411                                      tbl->current_rate, index);
2412                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2413                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2414                 } else
2415                         done_search = 1;
2416         }
2417
2418         if (done_search && !lq_sta->stay_in_tbl) {
2419                 /* If the "active" (non-search) mode was legacy,
2420                  * and we've tried switching antennas,
2421                  * but we haven't been able to try HT modes (not available),
2422                  * stay with best antenna legacy modulation for a while
2423                  * before next round of mode comparisons. */
2424                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2425                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2426                     lq_sta->action_counter > tbl1->max_search) {
2427                         IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2428                         rs_set_stay_in_table(priv, 1, lq_sta);
2429                 }
2430
2431                 /* If we're in an HT mode, and all 3 mode switch actions
2432                  * have been tried and compared, stay in this best modulation
2433                  * mode for a while before next round of mode comparisons. */
2434                 if (lq_sta->enable_counter &&
2435                     (lq_sta->action_counter >= tbl1->max_search) &&
2436                     iwl_ht_enabled(priv)) {
2437                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2438                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2439                             (tid != MAX_TID_COUNT)) {
2440                                 tid_data =
2441                                    &priv->stations[lq_sta->lq.sta_id].tid[tid];
2442                                 if (tid_data->agg.state == IWL_AGG_OFF) {
2443                                         IWL_DEBUG_RATE(priv,
2444                                                        "try to aggregate tid %d\n",
2445                                                        tid);
2446                                         rs_tl_turn_on_agg(priv, tid,
2447                                                           lq_sta, sta);
2448                                 }
2449                         }
2450                         rs_set_stay_in_table(priv, 0, lq_sta);
2451                 }
2452         }
2453
2454 out:
2455         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2456         i = index;
2457         lq_sta->last_txrate_idx = i;
2458
2459         return;
2460 }
2461
2462
2463 static void rs_initialize_lq(struct iwl_priv *priv,
2464                              struct ieee80211_conf *conf,
2465                              struct ieee80211_sta *sta,
2466                              struct iwl_lq_sta *lq_sta)
2467 {
2468         struct iwl_scale_tbl_info *tbl;
2469         int rate_idx;
2470         int i;
2471         u32 rate;
2472         u8 use_green = rs_use_green(priv, conf);
2473         u8 active_tbl = 0;
2474         u8 valid_tx_ant;
2475
2476         if (!sta || !lq_sta)
2477                 goto out;
2478
2479         i = lq_sta->last_txrate_idx;
2480
2481         if ((lq_sta->lq.sta_id == 0xff) &&
2482             (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2483                 goto out;
2484
2485         valid_tx_ant = priv->hw_params.valid_tx_ant;
2486
2487         if (!lq_sta->search_better_tbl)
2488                 active_tbl = lq_sta->active_tbl;
2489         else
2490                 active_tbl = 1 - lq_sta->active_tbl;
2491
2492         tbl = &(lq_sta->lq_info[active_tbl]);
2493
2494         if ((i < 0) || (i >= IWL_RATE_COUNT))
2495                 i = 0;
2496
2497         rate = iwl_rates[i].plcp;
2498         tbl->ant_type = first_antenna(valid_tx_ant);
2499         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2500
2501         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2502                 rate |= RATE_MCS_CCK_MSK;
2503
2504         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2505         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2506             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2507
2508         rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2509         tbl->current_rate = rate;
2510         rs_set_expected_tpt_table(lq_sta, tbl);
2511         rs_fill_link_cmd(NULL, lq_sta, rate);
2512         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2513  out:
2514         return;
2515 }
2516
2517 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2518                         struct ieee80211_tx_rate_control *txrc)
2519 {
2520
2521         struct sk_buff *skb = txrc->skb;
2522         struct ieee80211_supported_band *sband = txrc->sband;
2523         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2524         struct ieee80211_conf *conf = &priv->hw->conf;
2525         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2526         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2527         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2528         struct iwl_lq_sta *lq_sta = priv_sta;
2529         int rate_idx;
2530
2531         IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2532
2533         /* Get max rate if user set max rate */
2534         if (lq_sta) {
2535                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2536                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2537                     (lq_sta->max_rate_idx != -1))
2538                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2539                 if ((lq_sta->max_rate_idx < 0) ||
2540                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2541                         lq_sta->max_rate_idx = -1;
2542         }
2543
2544         /* Send management frames and NO_ACK data using lowest rate. */
2545         if (rate_control_send_low(sta, priv_sta, txrc))
2546                 return;
2547
2548         rate_idx  = lq_sta->last_txrate_idx;
2549
2550         if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2551             !lq_sta->ibss_sta_added) {
2552                 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2553
2554                 if (sta_id == IWL_INVALID_STATION) {
2555                         IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n",
2556                                        hdr->addr1);
2557                         sta_id = iwl_add_station(priv, hdr->addr1,
2558                                                 false, CMD_ASYNC, ht_cap);
2559                 }
2560                 if ((sta_id != IWL_INVALID_STATION)) {
2561                         lq_sta->lq.sta_id = sta_id;
2562                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2563                         lq_sta->ibss_sta_added = 1;
2564                         rs_initialize_lq(priv, conf, sta, lq_sta);
2565                 }
2566         }
2567
2568         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2569                 rate_idx -= IWL_FIRST_OFDM_RATE;
2570                 /* 6M and 9M shared same MCS index */
2571                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2572                 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2573                     IWL_RATE_MIMO3_6M_PLCP)
2574                         rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2575                 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2576                          IWL_RATE_MIMO2_6M_PLCP)
2577                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2578                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2579                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2580                         info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2581                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2582                         info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2583                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2584                         info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2585                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2586                         info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2587         } else {
2588                 if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT)
2589                         rate_idx = rate_lowest_index(sband, sta);
2590                 else if (sband->band == IEEE80211_BAND_5GHZ)
2591                         rate_idx -= IWL_FIRST_OFDM_RATE;
2592         }
2593         info->control.rates[0].idx = rate_idx;
2594
2595 }
2596
2597 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2598                           gfp_t gfp)
2599 {
2600         struct iwl_lq_sta *lq_sta;
2601         struct iwl_priv *priv;
2602         int i, j;
2603
2604         priv = (struct iwl_priv *)priv_rate;
2605         IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2606
2607         lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2608
2609         if (lq_sta == NULL)
2610                 return NULL;
2611         lq_sta->lq.sta_id = 0xff;
2612
2613
2614         for (j = 0; j < LQ_SIZE; j++)
2615                 for (i = 0; i < IWL_RATE_COUNT; i++)
2616                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2617
2618         return lq_sta;
2619 }
2620
2621 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2622                          struct ieee80211_sta *sta, void *priv_sta)
2623 {
2624         int i, j;
2625         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2626         struct ieee80211_conf *conf = &priv->hw->conf;
2627         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2628         struct iwl_lq_sta *lq_sta = priv_sta;
2629         u16 mask_bit = 0;
2630         int count;
2631         int start_rate = 0;
2632
2633         lq_sta->flush_timer = 0;
2634         lq_sta->supp_rates = sta->supp_rates[sband->band];
2635         for (j = 0; j < LQ_SIZE; j++)
2636                 for (i = 0; i < IWL_RATE_COUNT; i++)
2637                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2638
2639         IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init ***\n");
2640         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2641          * the lowest or the highest rate.. Could consider using RSSI from
2642          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2643          * after assoc.. */
2644
2645         lq_sta->ibss_sta_added = 0;
2646         if (priv->iw_mode == NL80211_IFTYPE_AP) {
2647                 u8 sta_id = iwl_find_station(priv,
2648                                                                 sta->addr);
2649
2650                 /* for IBSS the call are from tasklet */
2651                 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
2652
2653                 if (sta_id == IWL_INVALID_STATION) {
2654                         IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
2655                         sta_id = iwl_add_station(priv, sta->addr, false,
2656                                                 CMD_ASYNC, ht_cap);
2657                 }
2658                 if ((sta_id != IWL_INVALID_STATION)) {
2659                         lq_sta->lq.sta_id = sta_id;
2660                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2661                 }
2662                 /* FIXME: this is w/a remove it later */
2663                 priv->assoc_station_added = 1;
2664         }
2665
2666         lq_sta->is_dup = 0;
2667         lq_sta->max_rate_idx = -1;
2668         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2669         lq_sta->is_green = rs_use_green(priv, conf);
2670         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2671         lq_sta->active_rate_basic = priv->active_rate_basic;
2672         lq_sta->band = priv->band;
2673         /*
2674          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2675          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2676          */
2677         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2678         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2679         lq_sta->active_siso_rate &= ~((u16)0x2);
2680         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2681
2682         /* Same here */
2683         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2684         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2685         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2686         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2687
2688         lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2689         lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2690         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2691         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2692
2693         IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2694                      lq_sta->active_siso_rate,
2695                      lq_sta->active_mimo2_rate,
2696                      lq_sta->active_mimo3_rate);
2697
2698         /* These values will be overridden later */
2699         lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2700         lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2701
2702         /* as default allow aggregation for all tids */
2703         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2704         lq_sta->drv = priv;
2705
2706         /* Find highest tx rate supported by hardware and destination station */
2707         mask_bit = sta->supp_rates[sband->band];
2708         count = sband->n_bitrates;
2709         if (sband->band == IEEE80211_BAND_5GHZ) {
2710                 count += IWL_FIRST_OFDM_RATE;
2711                 start_rate = IWL_FIRST_OFDM_RATE;
2712                 mask_bit <<= IWL_FIRST_OFDM_RATE;
2713         }
2714
2715         mask_bit = mask_bit & lq_sta->active_legacy_rate;
2716         lq_sta->last_txrate_idx = 4;
2717         for (i = start_rate; i < count; i++)
2718                 if (mask_bit & BIT(i))
2719                         lq_sta->last_txrate_idx = i;
2720
2721         rs_initialize_lq(priv, conf, sta, lq_sta);
2722 }
2723
2724 static void rs_fill_link_cmd(struct iwl_priv *priv,
2725                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2726 {
2727         struct iwl_scale_tbl_info tbl_type;
2728         int index = 0;
2729         int rate_idx;
2730         int repeat_rate = 0;
2731         u8 ant_toggle_cnt = 0;
2732         u8 use_ht_possible = 1;
2733         u8 valid_tx_ant = 0;
2734         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2735
2736         /* Override starting rate (index 0) if needed for debug purposes */
2737         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2738
2739         /* Interpret new_rate (rate_n_flags) */
2740         memset(&tbl_type, 0, sizeof(tbl_type));
2741         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2742                                   &tbl_type, &rate_idx);
2743
2744         /* How many times should we repeat the initial rate? */
2745         if (is_legacy(tbl_type.lq_type)) {
2746                 ant_toggle_cnt = 1;
2747                 repeat_rate = IWL_NUMBER_TRY;
2748         } else {
2749                 repeat_rate = IWL_HT_NUMBER_TRY;
2750         }
2751
2752         lq_cmd->general_params.mimo_delimiter =
2753                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2754
2755         /* Fill 1st table entry (index 0) */
2756         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2757
2758         if (num_of_ant(tbl_type.ant_type) == 1) {
2759                 lq_cmd->general_params.single_stream_ant_msk =
2760                                                 tbl_type.ant_type;
2761         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2762                 lq_cmd->general_params.dual_stream_ant_msk =
2763                                                 tbl_type.ant_type;
2764         } /* otherwise we don't modify the existing value */
2765
2766         index++;
2767         repeat_rate--;
2768
2769         if (priv)
2770                 valid_tx_ant = priv->hw_params.valid_tx_ant;
2771
2772         /* Fill rest of rate table */
2773         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2774                 /* Repeat initial/next rate.
2775                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2776                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2777                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2778                         if (is_legacy(tbl_type.lq_type)) {
2779                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2780                                         ant_toggle_cnt++;
2781                                 else if (priv &&
2782                                          rs_toggle_antenna(valid_tx_ant,
2783                                                         &new_rate, &tbl_type))
2784                                         ant_toggle_cnt = 1;
2785 }
2786
2787                         /* Override next rate if needed for debug purposes */
2788                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2789
2790                         /* Fill next table entry */
2791                         lq_cmd->rs_table[index].rate_n_flags =
2792                                         cpu_to_le32(new_rate);
2793                         repeat_rate--;
2794                         index++;
2795                 }
2796
2797                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2798                                                 &rate_idx);
2799
2800                 /* Indicate to uCode which entries might be MIMO.
2801                  * If initial rate was MIMO, this will finally end up
2802                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2803                 if (is_mimo(tbl_type.lq_type))
2804                         lq_cmd->general_params.mimo_delimiter = index;
2805
2806                 /* Get next rate */
2807                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2808                                              use_ht_possible);
2809
2810                 /* How many times should we repeat the next rate? */
2811                 if (is_legacy(tbl_type.lq_type)) {
2812                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2813                                 ant_toggle_cnt++;
2814                         else if (priv &&
2815                                  rs_toggle_antenna(valid_tx_ant,
2816                                                    &new_rate, &tbl_type))
2817                                 ant_toggle_cnt = 1;
2818
2819                         repeat_rate = IWL_NUMBER_TRY;
2820                 } else {
2821                         repeat_rate = IWL_HT_NUMBER_TRY;
2822                 }
2823
2824                 /* Don't allow HT rates after next pass.
2825                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2826                 use_ht_possible = 0;
2827
2828                 /* Override next rate if needed for debug purposes */
2829                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2830
2831                 /* Fill next table entry */
2832                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2833
2834                 index++;
2835                 repeat_rate--;
2836         }
2837
2838         lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_MAX;
2839         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2840         lq_cmd->agg_params.agg_time_limit =
2841                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2842 }
2843
2844 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2845 {
2846         return hw->priv;
2847 }
2848 /* rate scale requires free function to be implemented */
2849 static void rs_free(void *priv_rate)
2850 {
2851         return;
2852 }
2853
2854 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2855                         void *priv_sta)
2856 {
2857         struct iwl_lq_sta *lq_sta = priv_sta;
2858         struct iwl_priv *priv __maybe_unused = priv_r;
2859
2860         IWL_DEBUG_RATE(priv, "enter\n");
2861         kfree(lq_sta);
2862         IWL_DEBUG_RATE(priv, "leave\n");
2863 }
2864
2865
2866 #ifdef CONFIG_MAC80211_DEBUGFS
2867 static int open_file_generic(struct inode *inode, struct file *file)
2868 {
2869         file->private_data = inode->i_private;
2870         return 0;
2871 }
2872 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2873                              u32 *rate_n_flags, int index)
2874 {
2875         struct iwl_priv *priv;
2876         u8 valid_tx_ant;
2877         u8 ant_sel_tx;
2878
2879         priv = lq_sta->drv;
2880         valid_tx_ant = priv->hw_params.valid_tx_ant;
2881         if (lq_sta->dbg_fixed_rate) {
2882                 ant_sel_tx =
2883                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2884                   >> RATE_MCS_ANT_POS);
2885                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2886                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2887                         IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
2888                 } else {
2889                         lq_sta->dbg_fixed_rate = 0;
2890                         IWL_ERR(priv,
2891                             "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2892                             ant_sel_tx, valid_tx_ant);
2893                         IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2894                 }
2895         } else {
2896                 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2897         }
2898 }
2899
2900 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2901                         const char __user *user_buf, size_t count, loff_t *ppos)
2902 {
2903         struct iwl_lq_sta *lq_sta = file->private_data;
2904         struct iwl_priv *priv;
2905         char buf[64];
2906         int buf_size;
2907         u32 parsed_rate;
2908
2909         priv = lq_sta->drv;
2910         memset(buf, 0, sizeof(buf));
2911         buf_size = min(count, sizeof(buf) -  1);
2912         if (copy_from_user(buf, user_buf, buf_size))
2913                 return -EFAULT;
2914
2915         if (sscanf(buf, "%x", &parsed_rate) == 1)
2916                 lq_sta->dbg_fixed_rate = parsed_rate;
2917         else
2918                 lq_sta->dbg_fixed_rate = 0;
2919
2920         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2921         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2922         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2923         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2924
2925         IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
2926                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2927
2928         if (lq_sta->dbg_fixed_rate) {
2929                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2930                 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2931         }
2932
2933         return count;
2934 }
2935
2936 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2937                         char __user *user_buf, size_t count, loff_t *ppos)
2938 {
2939         char *buff;
2940         int desc = 0;
2941         int i = 0;
2942         int index = 0;
2943         ssize_t ret;
2944
2945         struct iwl_lq_sta *lq_sta = file->private_data;
2946         struct iwl_priv *priv;
2947         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2948
2949         priv = lq_sta->drv;
2950         buff = kmalloc(1024, GFP_KERNEL);
2951         if (!buff)
2952                 return -ENOMEM;
2953
2954         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2955         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2956                         lq_sta->total_failed, lq_sta->total_success,
2957                         lq_sta->active_legacy_rate);
2958         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2959                         lq_sta->dbg_fixed_rate);
2960         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2961             (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2962             (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2963             (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2964         desc += sprintf(buff+desc, "lq type %s\n",
2965            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2966         if (is_Ht(tbl->lq_type)) {
2967                 desc += sprintf(buff+desc, " %s",
2968                    (is_siso(tbl->lq_type)) ? "SISO" :
2969                    ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2970                    desc += sprintf(buff+desc, " %s",
2971                    (tbl->is_ht40) ? "40MHz" : "20MHz");
2972                    desc += sprintf(buff+desc, " %s %s\n", (tbl->is_SGI) ? "SGI" : "",
2973                    (lq_sta->is_green) ? "GF enabled" : "");
2974         }
2975         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2976                 lq_sta->last_rate_n_flags);
2977         desc += sprintf(buff+desc, "general:"
2978                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2979                 lq_sta->lq.general_params.flags,
2980                 lq_sta->lq.general_params.mimo_delimiter,
2981                 lq_sta->lq.general_params.single_stream_ant_msk,
2982                 lq_sta->lq.general_params.dual_stream_ant_msk);
2983
2984         desc += sprintf(buff+desc, "agg:"
2985                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2986                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2987                         lq_sta->lq.agg_params.agg_dis_start_th,
2988                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2989
2990         desc += sprintf(buff+desc,
2991                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2992                         lq_sta->lq.general_params.start_rate_index[0],
2993                         lq_sta->lq.general_params.start_rate_index[1],
2994                         lq_sta->lq.general_params.start_rate_index[2],
2995                         lq_sta->lq.general_params.start_rate_index[3]);
2996
2997         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2998                 index = iwl_hwrate_to_plcp_idx(
2999                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3000                 if (is_legacy(tbl->lq_type)) {
3001                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3002                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3003                                 iwl_rate_mcs[index].mbps);
3004                 } else {
3005                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3006                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3007                                 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3008                 }
3009         }
3010
3011         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3012         kfree(buff);
3013         return ret;
3014 }
3015
3016 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3017         .write = rs_sta_dbgfs_scale_table_write,
3018         .read = rs_sta_dbgfs_scale_table_read,
3019         .open = open_file_generic,
3020 };
3021 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3022                         char __user *user_buf, size_t count, loff_t *ppos)
3023 {
3024         char *buff;
3025         int desc = 0;
3026         int i, j;
3027         ssize_t ret;
3028
3029         struct iwl_lq_sta *lq_sta = file->private_data;
3030
3031         buff = kmalloc(1024, GFP_KERNEL);
3032         if (!buff)
3033                 return -ENOMEM;
3034
3035         for (i = 0; i < LQ_SIZE; i++) {
3036                 desc += sprintf(buff+desc,
3037                                 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3038                                 "rate=0x%X\n",
3039                                 lq_sta->active_tbl == i ? "*" : "x",
3040                                 lq_sta->lq_info[i].lq_type,
3041                                 lq_sta->lq_info[i].is_SGI,
3042                                 lq_sta->lq_info[i].is_ht40,
3043                                 lq_sta->lq_info[i].is_dup,
3044                                 lq_sta->is_green,
3045                                 lq_sta->lq_info[i].current_rate);
3046                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3047                         desc += sprintf(buff+desc,
3048                                 "counter=%d success=%d %%=%d\n",
3049                                 lq_sta->lq_info[i].win[j].counter,
3050                                 lq_sta->lq_info[i].win[j].success_counter,
3051                                 lq_sta->lq_info[i].win[j].success_ratio);
3052                 }
3053         }
3054         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3055         kfree(buff);
3056         return ret;
3057 }
3058
3059 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3060         .read = rs_sta_dbgfs_stats_table_read,
3061         .open = open_file_generic,
3062 };
3063
3064 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3065                         char __user *user_buf, size_t count, loff_t *ppos)
3066 {
3067         char buff[120];
3068         int desc = 0;
3069         ssize_t ret;
3070
3071         struct iwl_lq_sta *lq_sta = file->private_data;
3072         struct iwl_priv *priv;
3073         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3074
3075         priv = lq_sta->drv;
3076
3077         if (is_Ht(tbl->lq_type))
3078                 desc += sprintf(buff+desc,
3079                                 "Bit Rate= %d Mb/s\n",
3080                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3081         else
3082                 desc += sprintf(buff+desc,
3083                                 "Bit Rate= %d Mb/s\n",
3084                                 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3085         desc += sprintf(buff+desc,
3086                         "Signal Level= %d dBm\tNoise Level= %d dBm\n",
3087                         priv->last_rx_rssi, priv->last_rx_noise);
3088         desc += sprintf(buff+desc,
3089                         "Tsf= 0x%llx\tBeacon time= 0x%08X\n",
3090                         priv->last_tsf, priv->last_beacon_time);
3091
3092         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3093         return ret;
3094 }
3095
3096 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3097         .read = rs_sta_dbgfs_rate_scale_data_read,
3098         .open = open_file_generic,
3099 };
3100
3101 static void rs_add_debugfs(void *priv, void *priv_sta,
3102                                         struct dentry *dir)
3103 {
3104         struct iwl_lq_sta *lq_sta = priv_sta;
3105         lq_sta->rs_sta_dbgfs_scale_table_file =
3106                 debugfs_create_file("rate_scale_table", 0600, dir,
3107                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3108         lq_sta->rs_sta_dbgfs_stats_table_file =
3109                 debugfs_create_file("rate_stats_table", 0600, dir,
3110                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
3111         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3112                 debugfs_create_file("rate_scale_data", 0600, dir,
3113                         lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3114         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3115                 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
3116                 &lq_sta->tx_agg_tid_en);
3117
3118 }
3119
3120 static void rs_remove_debugfs(void *priv, void *priv_sta)
3121 {
3122         struct iwl_lq_sta *lq_sta = priv_sta;
3123         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3124         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3125         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3126         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3127 }
3128 #endif
3129
3130 static struct rate_control_ops rs_ops = {
3131         .module = NULL,
3132         .name = RS_NAME,
3133         .tx_status = rs_tx_status,
3134         .get_rate = rs_get_rate,
3135         .rate_init = rs_rate_init,
3136         .alloc = rs_alloc,
3137         .free = rs_free,
3138         .alloc_sta = rs_alloc_sta,
3139         .free_sta = rs_free_sta,
3140 #ifdef CONFIG_MAC80211_DEBUGFS
3141         .add_sta_debugfs = rs_add_debugfs,
3142         .remove_sta_debugfs = rs_remove_debugfs,
3143 #endif
3144 };
3145
3146 int iwlagn_rate_control_register(void)
3147 {
3148         return ieee80211_rate_control_register(&rs_ops);
3149 }
3150
3151 void iwlagn_rate_control_unregister(void)
3152 {
3153         ieee80211_rate_control_unregister(&rs_ops);
3154 }
3155