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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 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 time to accum history 2 seconds */
  53 #define IWL_RATE_SCALE_FLUSH_INTVL   (2*HZ)
  54
  55 static u8 rs_ht_to_legacy[] = {
  56         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  57         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  58         IWL_RATE_6M_INDEX,
  59         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  60         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  61         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  62         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  63 };
  64
  65 static const u8 ant_toggle_lookup[] = {
  66         /*ANT_NONE -> */ ANT_NONE,
  67         /*ANT_A    -> */ ANT_B,
  68         /*ANT_B    -> */ ANT_C,
  69         /*ANT_AB   -> */ ANT_BC,
  70         /*ANT_C    -> */ ANT_A,
  71         /*ANT_AC   -> */ ANT_AB,
  72         /*ANT_BC   -> */ ANT_AC,
  73         /*ANT_ABC  -> */ ANT_ABC,
  74 };
  75
  76 /**
  77  * struct iwl_rate_scale_data -- tx success history for one rate
  78  */
  79 struct iwl_rate_scale_data {
  80         u64 data;               /* bitmap of successful frames */
  81         s32 success_counter;    /* number of frames successful */
  82         s32 success_ratio;      /* per-cent * 128  */
  83         s32 counter;            /* number of frames attempted */
  84         s32 average_tpt;        /* success ratio * expected throughput */
  85         unsigned long stamp;
  86 };
  87
  88 /**
  89  * struct iwl_scale_tbl_info -- tx params and success history for all rates
  90  *
  91  * There are two of these in struct iwl_lq_sta,
  92  * one for "active", and one for "search".
  93  */
  94 struct iwl_scale_tbl_info {
  95         enum iwl_table_type lq_type;
  96         u8 ant_type;
  97         u8 is_SGI;      /* 1 = short guard interval */
  98         u8 is_fat;      /* 1 = 40 MHz channel width */
  99         u8 is_dup;      /* 1 = duplicated data streams */
 100         u8 action;      /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
 101         s32 *expected_tpt;      /* throughput metrics; expected_tpt_G, etc. */
 102         u32 current_rate;  /* rate_n_flags, uCode API format */
 103         struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
 104 };
 105
 106 struct iwl_traffic_load {
 107         unsigned long time_stamp;       /* age of the oldest statistics */
 108         u32 packet_count[TID_QUEUE_MAX_SIZE];   /* packet count in this time
 109                                                  * slice */
 110         u32 total;                      /* total num of packets during the
 111                                          * last TID_MAX_TIME_DIFF */
 112         u8 queue_count;                 /* number of queues that has
 113                                          * been used since the last cleanup */
 114         u8 head;                        /* start of the circular buffer */
 115 };
 116
 117 /**
 118  * struct iwl_lq_sta -- driver's rate scaling private structure
 119  *
 120  * Pointer to this gets passed back and forth between driver and mac80211.
 121  */
 122 struct iwl_lq_sta {
 123         u8 active_tbl;          /* index of active table, range 0-1 */
 124         u8 enable_counter;      /* indicates HT mode */
 125         u8 stay_in_tbl;         /* 1: disallow, 0: allow search for new mode */
 126         u8 search_better_tbl;   /* 1: currently trying alternate mode */
 127         s32 last_tpt;
 128
 129         /* The following determine when to search for a new mode */
 130         u32 table_count_limit;
 131         u32 max_failure_limit;  /* # failed frames before new search */
 132         u32 max_success_limit;  /* # successful frames before new search */
 133         u32 table_count;
 134         u32 total_failed;       /* total failed frames, any/all rates */
 135         u32 total_success;      /* total successful frames, any/all rates */
 136         u32 flush_timer;        /* time staying in mode before new search */
 137
 138         u8 action_counter;      /* # mode-switch actions tried */
 139         u8 is_green;
 140         u8 is_dup;
 141         enum ieee80211_band band;
 142         u8 ibss_sta_added;
 143
 144         /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
 145         u32 supp_rates;
 146         u16 active_legacy_rate;
 147         u16 active_siso_rate;
 148         u16 active_mimo2_rate;
 149         u16 active_mimo3_rate;
 150         u16 active_rate_basic;
 151         s8 max_rate_idx;     /* Max rate set by user */
 152
 153         struct iwl_link_quality_cmd lq;
 154         struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
 155         struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
 156         u8 tx_agg_tid_en;
 157 #ifdef CONFIG_MAC80211_DEBUGFS
 158         struct dentry *rs_sta_dbgfs_scale_table_file;
 159         struct dentry *rs_sta_dbgfs_stats_table_file;
 160         struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
 161         u32 dbg_fixed_rate;
 162 #endif
 163         struct iwl_priv *drv;
 164
 165         /* used to be in sta_info */
 166         int last_txrate_idx;
 167 };
 168
 169 static void rs_rate_scale_perform(struct iwl_priv *priv,
 170                                    struct ieee80211_hdr *hdr,
 171                                    struct ieee80211_sta *sta,
 172                                    struct iwl_lq_sta *lq_sta);
 173 static void rs_fill_link_cmd(const struct iwl_priv *priv,
 174                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 175
 176
 177 #ifdef CONFIG_MAC80211_DEBUGFS
 178 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 179                              u32 *rate_n_flags, int index);
 180 #else
 181 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 182                              u32 *rate_n_flags, int index)
 183 {}
 184 #endif
 185
 186 /*
 187  * Expected throughput metrics for following rates:
 188  * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 189  * "G" is the only table that supports CCK (the first 4 rates).
 190  */
 191 /*FIXME:RS:need to separate tables for MIMO2/MIMO3*/
 192 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
 193         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
 194 };
 195
 196 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
 197         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
 198 };
 199
 200 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
 201         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
 202 };
 203
 204 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
 205         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
 206 };
 207
 208 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
 209         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
 210 };
 211
 212 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
 213         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
 214 };
 215
 216 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
 217         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
 218 };
 219
 220 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
 221         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
 222 };
 223
 224 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
 225         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
 226 };
 227
 228 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
 229         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
 230 };
 231
 232 static inline u8 rs_extract_rate(u32 rate_n_flags)
 233 {
 234         return (u8)(rate_n_flags & 0xFF);
 235 }
 236
 237 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 238 {
 239         window->data = 0;
 240         window->success_counter = 0;
 241         window->success_ratio = IWL_INVALID_VALUE;
 242         window->counter = 0;
 243         window->average_tpt = IWL_INVALID_VALUE;
 244         window->stamp = 0;
 245 }
 246
 247 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 248 {
 249         return (ant_type & valid_antenna) == ant_type;
 250 }
 251
 252 /*
 253  *      removes the old data from the statistics. All data that is older than
 254  *      TID_MAX_TIME_DIFF, will be deleted.
 255  */
 256 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 257 {
 258         /* The oldest age we want to keep */
 259         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 260
 261         while (tl->queue_count &&
 262                (tl->time_stamp < oldest_time)) {
 263                 tl->total -= tl->packet_count[tl->head];
 264                 tl->packet_count[tl->head] = 0;
 265                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 266                 tl->queue_count--;
 267                 tl->head++;
 268                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 269                         tl->head = 0;
 270         }
 271 }
 272
 273 /*
 274  *      increment traffic load value for tid and also remove
 275  *      any old values if passed the certain time period
 276  */
 277 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 278                            struct ieee80211_hdr *hdr)
 279 {
 280         u32 curr_time = jiffies_to_msecs(jiffies);
 281         u32 time_diff;
 282         s32 index;
 283         struct iwl_traffic_load *tl = NULL;
 284         u8 tid;
 285
 286         if (ieee80211_is_data_qos(hdr->frame_control)) {
 287                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 288                 tid = qc[0] & 0xf;
 289         } else
 290                 return MAX_TID_COUNT;
 291
 292         tl = &lq_data->load[tid];
 293
 294         curr_time -= curr_time % TID_ROUND_VALUE;
 295
 296         /* Happens only for the first packet. Initialize the data */
 297         if (!(tl->queue_count)) {
 298                 tl->total = 1;
 299                 tl->time_stamp = curr_time;
 300                 tl->queue_count = 1;
 301                 tl->head = 0;
 302                 tl->packet_count[0] = 1;
 303                 return MAX_TID_COUNT;
 304         }
 305
 306         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 307         index = time_diff / TID_QUEUE_CELL_SPACING;
 308
 309         /* The history is too long: remove data that is older than */
 310         /* TID_MAX_TIME_DIFF */
 311         if (index >= TID_QUEUE_MAX_SIZE)
 312                 rs_tl_rm_old_stats(tl, curr_time);
 313
 314         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 315         tl->packet_count[index] = tl->packet_count[index] + 1;
 316         tl->total = tl->total + 1;
 317
 318         if ((index + 1) > tl->queue_count)
 319                 tl->queue_count = index + 1;
 320
 321         return tid;
 322 }
 323
 324 /*
 325         get the traffic load value for tid
 326 */
 327 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 328 {
 329         u32 curr_time = jiffies_to_msecs(jiffies);
 330         u32 time_diff;
 331         s32 index;
 332         struct iwl_traffic_load *tl = NULL;
 333
 334         if (tid >= TID_MAX_LOAD_COUNT)
 335                 return 0;
 336
 337         tl = &(lq_data->load[tid]);
 338
 339         curr_time -= curr_time % TID_ROUND_VALUE;
 340
 341         if (!(tl->queue_count))
 342                 return 0;
 343
 344         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 345         index = time_diff / TID_QUEUE_CELL_SPACING;
 346
 347         /* The history is too long: remove data that is older than */
 348         /* TID_MAX_TIME_DIFF */
 349         if (index >= TID_QUEUE_MAX_SIZE)
 350                 rs_tl_rm_old_stats(tl, curr_time);
 351
 352         return tl->total;
 353 }
 354
 355 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 356                                       struct iwl_lq_sta *lq_data, u8 tid,
 357                                       struct ieee80211_sta *sta)
 358 {
 359         if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
 360                 IWL_DEBUG_HT("Starting Tx agg: STA: %pM tid: %d\n",
 361                                 sta->addr, tid);
 362                 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
 363         }
 364 }
 365
 366 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 367                               struct iwl_lq_sta *lq_data,
 368                               struct ieee80211_sta *sta)
 369 {
 370         if ((tid < TID_MAX_LOAD_COUNT))
 371                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 372         else if (tid == IWL_AGG_ALL_TID)
 373                 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
 374                         rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 375 }
 376
 377 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 378 {
 379         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 380                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 381                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 382 }
 383
 384 /**
 385  * rs_collect_tx_data - Update the success/failure sliding window
 386  *
 387  * We keep a sliding window of the last 62 packets transmitted
 388  * at this rate.  window->data contains the bitmask of successful
 389  * packets.
 390  */
 391 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
 392                               int scale_index, s32 tpt, int retries,
 393                               int successes)
 394 {
 395         struct iwl_rate_scale_data *window = NULL;
 396         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 397         s32 fail_count;
 398
 399         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 400                 return -EINVAL;
 401
 402         /* Select data for current tx bit rate */
 403         window = &(windows[scale_index]);
 404
 405         /*
 406          * Keep track of only the latest 62 tx frame attempts in this rate's
 407          * history window; anything older isn't really relevant any more.
 408          * If we have filled up the sliding window, drop the oldest attempt;
 409          * if the oldest attempt (highest bit in bitmap) shows "success",
 410          * subtract "1" from the success counter (this is the main reason
 411          * we keep these bitmaps!).
 412          */
 413         while (retries > 0) {
 414                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 415
 416                         /* remove earliest */
 417                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 418
 419                         if (window->data & mask) {
 420                                 window->data &= ~mask;
 421                                 window->success_counter--;
 422                         }
 423                 }
 424
 425                 /* Increment frames-attempted counter */
 426                 window->counter++;
 427
 428                 /* Shift bitmap by one frame (throw away oldest history),
 429                  * OR in "1", and increment "success" if this
 430                  * frame was successful. */
 431                 window->data <<= 1;
 432                 if (successes > 0) {
 433                         window->success_counter++;
 434                         window->data |= 0x1;
 435                         successes--;
 436                 }
 437
 438                 retries--;
 439         }
 440
 441         /* Calculate current success ratio, avoid divide-by-0! */
 442         if (window->counter > 0)
 443                 window->success_ratio = 128 * (100 * window->success_counter)
 444                                         / window->counter;
 445         else
 446                 window->success_ratio = IWL_INVALID_VALUE;
 447
 448         fail_count = window->counter - window->success_counter;
 449
 450         /* Calculate average throughput, if we have enough history. */
 451         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 452             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 453                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 454         else
 455                 window->average_tpt = IWL_INVALID_VALUE;
 456
 457         /* Tag this window as having been updated */
 458         window->stamp = jiffies;
 459
 460         return 0;
 461 }
 462
 463 /*
 464  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 465  */
 466 /* FIXME:RS:remove this function and put the flags statically in the table */
 467 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
 468                                  struct iwl_scale_tbl_info *tbl,
 469                                  int index, u8 use_green)
 470 {
 471         u32 rate_n_flags = 0;
 472
 473         if (is_legacy(tbl->lq_type)) {
 474                 rate_n_flags = iwl_rates[index].plcp;
 475                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 476                         rate_n_flags |= RATE_MCS_CCK_MSK;
 477
 478         } else if (is_Ht(tbl->lq_type)) {
 479                 if (index > IWL_LAST_OFDM_RATE) {
 480                         IWL_ERR(priv, "Invalid HT rate index %d\n", index);
 481                         index = IWL_LAST_OFDM_RATE;
 482                 }
 483                 rate_n_flags = RATE_MCS_HT_MSK;
 484
 485                 if (is_siso(tbl->lq_type))
 486                         rate_n_flags |= iwl_rates[index].plcp_siso;
 487                 else if (is_mimo2(tbl->lq_type))
 488                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 489                 else
 490                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 491         } else {
 492                 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 493         }
 494
 495         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 496                                                      RATE_MCS_ANT_ABC_MSK);
 497
 498         if (is_Ht(tbl->lq_type)) {
 499                 if (tbl->is_fat) {
 500                         if (tbl->is_dup)
 501                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 502                         else
 503                                 rate_n_flags |= RATE_MCS_FAT_MSK;
 504                 }
 505                 if (tbl->is_SGI)
 506                         rate_n_flags |= RATE_MCS_SGI_MSK;
 507
 508                 if (use_green) {
 509                         rate_n_flags |= RATE_MCS_GF_MSK;
 510                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 511                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 512                                 IWL_ERR(priv, "GF was set with SGI:SISO\n");
 513                         }
 514                 }
 515         }
 516         return rate_n_flags;
 517 }
 518
 519 /*
 520  * Interpret uCode API's rate_n_flags format,
 521  * fill "search" or "active" tx mode table.
 522  */
 523 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 524                                     enum ieee80211_band band,
 525                                     struct iwl_scale_tbl_info *tbl,
 526                                     int *rate_idx)
 527 {
 528         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 529         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 530         u8 mcs;
 531
 532         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 533
 534         if (*rate_idx  == IWL_RATE_INVALID) {
 535                 *rate_idx = -1;
 536                 return -EINVAL;
 537         }
 538         tbl->is_SGI = 0;        /* default legacy setup */
 539         tbl->is_fat = 0;
 540         tbl->is_dup = 0;
 541         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 542         tbl->lq_type = LQ_NONE;
 543
 544         /* legacy rate format */
 545         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 546                 if (num_of_ant == 1) {
 547                         if (band == IEEE80211_BAND_5GHZ)
 548                                 tbl->lq_type = LQ_A;
 549                         else
 550                                 tbl->lq_type = LQ_G;
 551                 }
 552         /* HT rate format */
 553         } else {
 554                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 555                         tbl->is_SGI = 1;
 556
 557                 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
 558                     (rate_n_flags & RATE_MCS_DUP_MSK))
 559                         tbl->is_fat = 1;
 560
 561                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 562                         tbl->is_dup = 1;
 563
 564                 mcs = rs_extract_rate(rate_n_flags);
 565
 566                 /* SISO */
 567                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 568                         if (num_of_ant == 1)
 569                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 570                 /* MIMO2 */
 571                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 572                         if (num_of_ant == 2)
 573                                 tbl->lq_type = LQ_MIMO2;
 574                 /* MIMO3 */
 575                 } else {
 576                         if (num_of_ant == 3)
 577                                 tbl->lq_type = LQ_MIMO3;
 578                 }
 579         }
 580         return 0;
 581 }
 582
 583 /* switch to another antenna/antennas and return 1 */
 584 /* if no other valid antenna found, return 0 */
 585 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 586                              struct iwl_scale_tbl_info *tbl)
 587 {
 588         u8 new_ant_type;
 589
 590         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 591                 return 0;
 592
 593         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 594                 return 0;
 595
 596         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 597
 598         while ((new_ant_type != tbl->ant_type) &&
 599                !rs_is_valid_ant(valid_ant, new_ant_type))
 600                 new_ant_type = ant_toggle_lookup[new_ant_type];
 601
 602         if (new_ant_type == tbl->ant_type)
 603                 return 0;
 604
 605         tbl->ant_type = new_ant_type;
 606         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 607         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 608         return 1;
 609 }
 610
 611 /* FIXME:RS: in 4965 we don't use greenfield at all */
 612 /* FIXME:RS: don't use greenfield for now in TX */
 613 #if 0
 614 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
 615 {
 616         return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
 617                 priv->current_ht_config.is_green_field &&
 618                 !priv->current_ht_config.non_GF_STA_present;
 619 }
 620 #endif
 621 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
 622 {
 623         return 0;
 624 }
 625
 626 /**
 627  * rs_get_supported_rates - get the available rates
 628  *
 629  * if management frame or broadcast frame only return
 630  * basic available rates.
 631  *
 632  */
 633 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 634                                   struct ieee80211_hdr *hdr,
 635                                   enum iwl_table_type rate_type)
 636 {
 637         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
 638             lq_sta->active_rate_basic)
 639                 return lq_sta->active_rate_basic;
 640
 641         if (is_legacy(rate_type)) {
 642                 return lq_sta->active_legacy_rate;
 643         } else {
 644                 if (is_siso(rate_type))
 645                         return lq_sta->active_siso_rate;
 646                 else if (is_mimo2(rate_type))
 647                         return lq_sta->active_mimo2_rate;
 648                 else
 649                         return lq_sta->active_mimo3_rate;
 650         }
 651 }
 652
 653 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 654                                 int rate_type)
 655 {
 656         u8 high = IWL_RATE_INVALID;
 657         u8 low = IWL_RATE_INVALID;
 658
 659         /* 802.11A or ht walks to the next literal adjacent rate in
 660          * the rate table */
 661         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 662                 int i;
 663                 u32 mask;
 664
 665                 /* Find the previous rate that is in the rate mask */
 666                 i = index - 1;
 667                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 668                         if (rate_mask & mask) {
 669                                 low = i;
 670                                 break;
 671                         }
 672                 }
 673
 674                 /* Find the next rate that is in the rate mask */
 675                 i = index + 1;
 676                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 677                         if (rate_mask & mask) {
 678                                 high = i;
 679                                 break;
 680                         }
 681                 }
 682
 683                 return (high << 8) | low;
 684         }
 685
 686         low = index;
 687         while (low != IWL_RATE_INVALID) {
 688                 low = iwl_rates[low].prev_rs;
 689                 if (low == IWL_RATE_INVALID)
 690                         break;
 691                 if (rate_mask & (1 << low))
 692                         break;
 693                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
 694         }
 695
 696         high = index;
 697         while (high != IWL_RATE_INVALID) {
 698                 high = iwl_rates[high].next_rs;
 699                 if (high == IWL_RATE_INVALID)
 700                         break;
 701                 if (rate_mask & (1 << high))
 702                         break;
 703                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
 704         }
 705
 706         return (high << 8) | low;
 707 }
 708
 709 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 710                              struct iwl_scale_tbl_info *tbl,
 711                              u8 scale_index, u8 ht_possible)
 712 {
 713         s32 low;
 714         u16 rate_mask;
 715         u16 high_low;
 716         u8 switch_to_legacy = 0;
 717         u8 is_green = lq_sta->is_green;
 718
 719         /* check if we need to switch from HT to legacy rates.
 720          * assumption is that mandatory rates (1Mbps or 6Mbps)
 721          * are always supported (spec demand) */
 722         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 723                 switch_to_legacy = 1;
 724                 scale_index = rs_ht_to_legacy[scale_index];
 725                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 726                         tbl->lq_type = LQ_A;
 727                 else
 728                         tbl->lq_type = LQ_G;
 729
 730                 if (num_of_ant(tbl->ant_type) > 1)
 731                         tbl->ant_type = ANT_A;/*FIXME:RS*/
 732
 733                 tbl->is_fat = 0;
 734                 tbl->is_SGI = 0;
 735         }
 736
 737         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 738
 739         /* Mask with station rate restriction */
 740         if (is_legacy(tbl->lq_type)) {
 741                 /* supp_rates has no CCK bits in A mode */
 742                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 743                         rate_mask  = (u16)(rate_mask &
 744                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 745                 else
 746                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 747         }
 748
 749         /* If we switched from HT to legacy, check current rate */
 750         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 751                 low = scale_index;
 752                 goto out;
 753         }
 754
 755         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 756                                         tbl->lq_type);
 757         low = high_low & 0xff;
 758
 759         if (low == IWL_RATE_INVALID)
 760                 low = scale_index;
 761
 762 out:
 763         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 764 }
 765
 766 /*
 767  * mac80211 sends us Tx status
 768  */
 769 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 770                          struct ieee80211_sta *sta, void *priv_sta,
 771                          struct sk_buff *skb)
 772 {
 773         int status;
 774         u8 retries;
 775         int rs_index, index = 0;
 776         struct iwl_lq_sta *lq_sta = priv_sta;
 777         struct iwl_link_quality_cmd *table;
 778         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 779         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
 780         struct ieee80211_hw *hw = priv->hw;
 781         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 782         struct iwl_rate_scale_data *window = NULL;
 783         struct iwl_rate_scale_data *search_win = NULL;
 784         u32 tx_rate;
 785         struct iwl_scale_tbl_info tbl_type;
 786         struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
 787         u8 active_index = 0;
 788         s32 tpt = 0;
 789
 790         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
 791
 792         if (!ieee80211_is_data(hdr->frame_control) ||
 793             is_multicast_ether_addr(hdr->addr1))
 794                 return;
 795
 796         /* This packet was aggregated but doesn't carry rate scale info */
 797         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 798             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 799                 return;
 800
 801         retries = info->status.rates[0].count - 1;
 802
 803         if (retries > 15)
 804                 retries = 15;
 805
 806         if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
 807             !lq_sta->ibss_sta_added)
 808                 goto out;
 809
 810         table = &lq_sta->lq;
 811         active_index = lq_sta->active_tbl;
 812
 813         curr_tbl = &(lq_sta->lq_info[active_index]);
 814         search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
 815         window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
 816         search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
 817
 818         /*
 819          * Ignore this Tx frame response if its initial rate doesn't match
 820          * that of latest Link Quality command.  There may be stragglers
 821          * from a previous Link Quality command, but we're no longer interested
 822          * in those; they're either from the "active" mode while we're trying
 823          * to check "search" mode, or a prior "search" mode after we've moved
 824          * to a new "search" mode (which might become the new "active" mode).
 825          */
 826         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 827         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 828         if (priv->band == IEEE80211_BAND_5GHZ)
 829                 rs_index -= IWL_FIRST_OFDM_RATE;
 830
 831         if ((info->status.rates[0].idx < 0) ||
 832             (tbl_type.is_SGI != !!(info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)) ||
 833             (tbl_type.is_fat != !!(info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 834             (tbl_type.is_dup != !!(info->status.rates[0].flags & IEEE80211_TX_RC_DUP_DATA)) ||
 835             (tbl_type.ant_type != info->antenna_sel_tx) ||
 836             (!!(tx_rate & RATE_MCS_HT_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) ||
 837             (!!(tx_rate & RATE_MCS_GF_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 838             (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
 839              hw->wiphy->bands[info->band]->bitrates[info->status.rates[0].idx].bitrate)) {
 840                 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
 841                 /* the last LQ command could failed so the LQ in ucode not
 842                  * the same in driver sync up
 843                  */
 844                 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
 845                 goto out;
 846         }
 847
 848         /* Update frame history window with "failure" for each Tx retry. */
 849         while (retries) {
 850                 /* Look up the rate and other info used for each tx attempt.
 851                  * Each tx attempt steps one entry deeper in the rate table. */
 852                 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 853                 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
 854                                           &tbl_type, &rs_index);
 855
 856                 /* If type matches "search" table,
 857                  * add failure to "search" history */
 858                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 859                     (tbl_type.ant_type == search_tbl->ant_type) &&
 860                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 861                         if (search_tbl->expected_tpt)
 862                                 tpt = search_tbl->expected_tpt[rs_index];
 863                         else
 864                                 tpt = 0;
 865                         rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
 866
 867                 /* Else if type matches "current/active" table,
 868                  * add failure to "current/active" history */
 869                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 870                            (tbl_type.ant_type == curr_tbl->ant_type) &&
 871                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 872                         if (curr_tbl->expected_tpt)
 873                                 tpt = curr_tbl->expected_tpt[rs_index];
 874                         else
 875                                 tpt = 0;
 876                         rs_collect_tx_data(window, rs_index, tpt, 1, 0);
 877                 }
 878
 879                 /* If not searching for a new mode, increment failed counter
 880                  * ... this helps determine when to start searching again */
 881                 if (lq_sta->stay_in_tbl)
 882                         lq_sta->total_failed++;
 883                 --retries;
 884                 index++;
 885
 886         }
 887
 888         /*
 889          * Find (by rate) the history window to update with final Tx attempt;
 890          * if Tx was successful first try, use original rate,
 891          * else look up the rate that was, finally, successful.
 892          */
 893         tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 894         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 895
 896         /* Update frame history window with "success" if Tx got ACKed ... */
 897         status = !!(info->flags & IEEE80211_TX_STAT_ACK);
 898
 899         /* If type matches "search" table,
 900          * add final tx status to "search" history */
 901         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 902             (tbl_type.ant_type == search_tbl->ant_type) &&
 903             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 904                 if (search_tbl->expected_tpt)
 905                         tpt = search_tbl->expected_tpt[rs_index];
 906                 else
 907                         tpt = 0;
 908                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 909                         rs_collect_tx_data(search_win, rs_index, tpt,
 910                                            info->status.ampdu_ack_len,
 911                                            info->status.ampdu_ack_map);
 912                 else
 913                         rs_collect_tx_data(search_win, rs_index, tpt,
 914                                            1, status);
 915         /* Else if type matches "current/active" table,
 916          * add final tx status to "current/active" history */
 917         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 918                    (tbl_type.ant_type == curr_tbl->ant_type) &&
 919                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 920                 if (curr_tbl->expected_tpt)
 921                         tpt = curr_tbl->expected_tpt[rs_index];
 922                 else
 923                         tpt = 0;
 924                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 925                         rs_collect_tx_data(window, rs_index, tpt,
 926                                            info->status.ampdu_ack_len,
 927                                            info->status.ampdu_ack_map);
 928                 else
 929                         rs_collect_tx_data(window, rs_index, tpt,
 930                                            1, status);
 931         }
 932
 933         /* If not searching for new mode, increment success/failed counter
 934          * ... these help determine when to start searching again */
 935         if (lq_sta->stay_in_tbl) {
 936                 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
 937                         lq_sta->total_success += info->status.ampdu_ack_map;
 938                         lq_sta->total_failed +=
 939                              (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
 940                 } else {
 941                         if (status)
 942                                 lq_sta->total_success++;
 943                         else
 944                                 lq_sta->total_failed++;
 945                 }
 946         }
 947
 948         /* See if there's a better rate or modulation mode to try. */
 949         if (sta && sta->supp_rates[sband->band])
 950                 rs_rate_scale_perform(priv, hdr, sta, lq_sta);
 951 out:
 952         return;
 953 }
 954
 955 /*
 956  * Begin a period of staying with a selected modulation mode.
 957  * Set "stay_in_tbl" flag to prevent any mode switches.
 958  * Set frame tx success limits according to legacy vs. high-throughput,
 959  * and reset overall (spanning all rates) tx success history statistics.
 960  * These control how long we stay using same modulation mode before
 961  * searching for a new mode.
 962  */
 963 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
 964                                  struct iwl_lq_sta *lq_sta)
 965 {
 966         IWL_DEBUG_RATE("we are staying in the same table\n");
 967         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
 968         if (is_legacy) {
 969                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
 970                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
 971                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
 972         } else {
 973                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
 974                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
 975                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
 976         }
 977         lq_sta->table_count = 0;
 978         lq_sta->total_failed = 0;
 979         lq_sta->total_success = 0;
 980 }
 981
 982 /*
 983  * Find correct throughput table for given mode of modulation
 984  */
 985 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
 986                                       struct iwl_scale_tbl_info *tbl)
 987 {
 988         if (is_legacy(tbl->lq_type)) {
 989                 if (!is_a_band(tbl->lq_type))
 990                         tbl->expected_tpt = expected_tpt_G;
 991                 else
 992                         tbl->expected_tpt = expected_tpt_A;
 993         } else if (is_siso(tbl->lq_type)) {
 994                 if (tbl->is_fat && !lq_sta->is_dup)
 995                         if (tbl->is_SGI)
 996                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
 997                         else
 998                                 tbl->expected_tpt = expected_tpt_siso40MHz;
 999                 else if (tbl->is_SGI)
1000                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1001                 else
1002                         tbl->expected_tpt = expected_tpt_siso20MHz;
1003
1004         } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1005                 if (tbl->is_fat && !lq_sta->is_dup)
1006                         if (tbl->is_SGI)
1007                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1008                         else
1009                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
1010                 else if (tbl->is_SGI)
1011                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1012                 else
1013                         tbl->expected_tpt = expected_tpt_mimo20MHz;
1014         } else
1015                 tbl->expected_tpt = expected_tpt_G;
1016 }
1017
1018 /*
1019  * Find starting rate for new "search" high-throughput mode of modulation.
1020  * Goal is to find lowest expected rate (under perfect conditions) that is
1021  * above the current measured throughput of "active" mode, to give new mode
1022  * a fair chance to prove itself without too many challenges.
1023  *
1024  * This gets called when transitioning to more aggressive modulation
1025  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1026  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1027  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1028  * bit rate will typically need to increase, but not if performance was bad.
1029  */
1030 static s32 rs_get_best_rate(struct iwl_priv *priv,
1031                             struct iwl_lq_sta *lq_sta,
1032                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1033                             u16 rate_mask, s8 index)
1034 {
1035         /* "active" values */
1036         struct iwl_scale_tbl_info *active_tbl =
1037             &(lq_sta->lq_info[lq_sta->active_tbl]);
1038         s32 active_sr = active_tbl->win[index].success_ratio;
1039         s32 active_tpt = active_tbl->expected_tpt[index];
1040
1041         /* expected "search" throughput */
1042         s32 *tpt_tbl = tbl->expected_tpt;
1043
1044         s32 new_rate, high, low, start_hi;
1045         u16 high_low;
1046         s8 rate = index;
1047
1048         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1049
1050         for (; ;) {
1051                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1052                                                 tbl->lq_type);
1053
1054                 low = high_low & 0xff;
1055                 high = (high_low >> 8) & 0xff;
1056
1057                 /*
1058                  * Lower the "search" bit rate, to give new "search" mode
1059                  * approximately the same throughput as "active" if:
1060                  *
1061                  * 1) "Active" mode has been working modestly well (but not
1062                  *    great), and expected "search" throughput (under perfect
1063                  *    conditions) at candidate rate is above the actual
1064                  *    measured "active" throughput (but less than expected
1065                  *    "active" throughput under perfect conditions).
1066                  * OR
1067                  * 2) "Active" mode has been working perfectly or very well
1068                  *    and expected "search" throughput (under perfect
1069                  *    conditions) at candidate rate is above expected
1070                  *    "active" throughput (under perfect conditions).
1071                  */
1072                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1073                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1074                       (active_sr <= IWL_RATE_HIGH_TH) &&
1075                       (tpt_tbl[rate] <= active_tpt))) ||
1076                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1077                      (tpt_tbl[rate] > active_tpt))) {
1078
1079                         /* (2nd or later pass)
1080                          * If we've already tried to raise the rate, and are
1081                          * now trying to lower it, use the higher rate. */
1082                         if (start_hi != IWL_RATE_INVALID) {
1083                                 new_rate = start_hi;
1084                                 break;
1085                         }
1086
1087                         new_rate = rate;
1088
1089                         /* Loop again with lower rate */
1090                         if (low != IWL_RATE_INVALID)
1091                                 rate = low;
1092
1093                         /* Lower rate not available, use the original */
1094                         else
1095                                 break;
1096
1097                 /* Else try to raise the "search" rate to match "active" */
1098                 } else {
1099                         /* (2nd or later pass)
1100                          * If we've already tried to lower the rate, and are
1101                          * now trying to raise it, use the lower rate. */
1102                         if (new_rate != IWL_RATE_INVALID)
1103                                 break;
1104
1105                         /* Loop again with higher rate */
1106                         else if (high != IWL_RATE_INVALID) {
1107                                 start_hi = high;
1108                                 rate = high;
1109
1110                         /* Higher rate not available, use the original */
1111                         } else {
1112                                 new_rate = rate;
1113                                 break;
1114                         }
1115                 }
1116         }
1117
1118         return new_rate;
1119 }
1120
1121 /*
1122  * Set up search table for MIMO
1123  */
1124 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1125                              struct iwl_lq_sta *lq_sta,
1126                              struct ieee80211_conf *conf,
1127                              struct ieee80211_sta *sta,
1128                              struct iwl_scale_tbl_info *tbl, int index)
1129 {
1130         u16 rate_mask;
1131         s32 rate;
1132         s8 is_green = lq_sta->is_green;
1133
1134         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1135                 return -1;
1136
1137         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1138                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1139                 return -1;
1140
1141         /* Need both Tx chains/antennas to support MIMO */
1142         if (priv->hw_params.tx_chains_num < 2)
1143                 return -1;
1144
1145         IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1146
1147         tbl->lq_type = LQ_MIMO2;
1148         tbl->is_dup = lq_sta->is_dup;
1149         tbl->action = 0;
1150         rate_mask = lq_sta->active_mimo2_rate;
1151
1152         if (priv->current_ht_config.supported_chan_width
1153                                         == IWL_CHANNEL_WIDTH_40MHZ)
1154                 tbl->is_fat = 1;
1155         else
1156                 tbl->is_fat = 0;
1157
1158         /* FIXME: - don't toggle SGI here
1159         if (tbl->is_fat) {
1160                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1161                         tbl->is_SGI = 1;
1162                 else
1163                         tbl->is_SGI = 0;
1164         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1165                 tbl->is_SGI = 1;
1166         else
1167                 tbl->is_SGI = 0;
1168         */
1169
1170         rs_set_expected_tpt_table(lq_sta, tbl);
1171
1172         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1173
1174         IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1175
1176         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1177                 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1178                                                 rate, rate_mask);
1179                 return -1;
1180         }
1181         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1182
1183         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1184                      tbl->current_rate, is_green);
1185         return 0;
1186 }
1187
1188 /*
1189  * Set up search table for SISO
1190  */
1191 static int rs_switch_to_siso(struct iwl_priv *priv,
1192                              struct iwl_lq_sta *lq_sta,
1193                              struct ieee80211_conf *conf,
1194                              struct ieee80211_sta *sta,
1195                              struct iwl_scale_tbl_info *tbl, int index)
1196 {
1197         u16 rate_mask;
1198         u8 is_green = lq_sta->is_green;
1199         s32 rate;
1200
1201         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1202                 return -1;
1203
1204         IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1205
1206         tbl->is_dup = lq_sta->is_dup;
1207         tbl->lq_type = LQ_SISO;
1208         tbl->action = 0;
1209         rate_mask = lq_sta->active_siso_rate;
1210
1211         if (priv->current_ht_config.supported_chan_width
1212             == IWL_CHANNEL_WIDTH_40MHZ)
1213                 tbl->is_fat = 1;
1214         else
1215                 tbl->is_fat = 0;
1216
1217         /* FIXME: - don't toggle SGI here
1218         if (tbl->is_fat) {
1219                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1220                         tbl->is_SGI = 1;
1221                 else
1222                         tbl->is_SGI = 0;
1223         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1224                 tbl->is_SGI = 1;
1225         else
1226                 tbl->is_SGI = 0;
1227         */
1228
1229         if (is_green)
1230                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1231
1232         rs_set_expected_tpt_table(lq_sta, tbl);
1233         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1234
1235         IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1236         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1237                 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1238                              rate, rate_mask);
1239                 return -1;
1240         }
1241         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1242         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1243                      tbl->current_rate, is_green);
1244         return 0;
1245 }
1246
1247 /*
1248  * Try to switch to new modulation mode from legacy
1249  */
1250 static int rs_move_legacy_other(struct iwl_priv *priv,
1251                                 struct iwl_lq_sta *lq_sta,
1252                                 struct ieee80211_conf *conf,
1253                                 struct ieee80211_sta *sta,
1254                                 int index)
1255 {
1256         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1257         struct iwl_scale_tbl_info *search_tbl =
1258                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1259         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1260         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1261                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1262         u8 start_action = tbl->action;
1263         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1264         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1265         int ret = 0;
1266
1267         for (; ;) {
1268                 switch (tbl->action) {
1269                 case IWL_LEGACY_SWITCH_ANTENNA1:
1270                 case IWL_LEGACY_SWITCH_ANTENNA2:
1271                         IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1272
1273                         lq_sta->action_counter++;
1274
1275                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1276                                                         tx_chains_num <= 1) ||
1277                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1278                                                         tx_chains_num <= 2))
1279                                 break;
1280
1281                         /* Don't change antenna if success has been great */
1282                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1283                                 break;
1284
1285                         /* Set up search table to try other antenna */
1286                         memcpy(search_tbl, tbl, sz);
1287
1288                         if (rs_toggle_antenna(valid_tx_ant,
1289                                 &search_tbl->current_rate, search_tbl)) {
1290                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1291                                 goto out;
1292                         }
1293                         break;
1294                 case IWL_LEGACY_SWITCH_SISO:
1295                         IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1296
1297                         /* Set up search table to try SISO */
1298                         memcpy(search_tbl, tbl, sz);
1299                         search_tbl->is_SGI = 0;
1300                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1301                                                  search_tbl, index);
1302                         if (!ret) {
1303                                 lq_sta->action_counter = 0;
1304                                 goto out;
1305                         }
1306
1307                         break;
1308                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1309                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1310                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1311                         IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1312
1313                         /* Set up search table to try MIMO */
1314                         memcpy(search_tbl, tbl, sz);
1315                         search_tbl->is_SGI = 0;
1316
1317                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1318                                 search_tbl->ant_type = ANT_AB;
1319                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1320                                 search_tbl->ant_type = ANT_AC;
1321                         else
1322                                 search_tbl->ant_type = ANT_BC;
1323
1324                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1325                                 break;
1326
1327                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1328                                                  search_tbl, index);
1329                         if (!ret) {
1330                                 lq_sta->action_counter = 0;
1331                                 goto out;
1332                         }
1333                         break;
1334                 }
1335                 tbl->action++;
1336                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1337                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1338
1339                 if (tbl->action == start_action)
1340                         break;
1341
1342         }
1343         search_tbl->lq_type = LQ_NONE;
1344         return 0;
1345
1346 out:
1347         lq_sta->search_better_tbl = 1;
1348         tbl->action++;
1349         if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1350                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1351         return 0;
1352
1353 }
1354
1355 /*
1356  * Try to switch to new modulation mode from SISO
1357  */
1358 static int rs_move_siso_to_other(struct iwl_priv *priv,
1359                                  struct iwl_lq_sta *lq_sta,
1360                                  struct ieee80211_conf *conf,
1361                                  struct ieee80211_sta *sta, int index)
1362 {
1363         u8 is_green = lq_sta->is_green;
1364         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1365         struct iwl_scale_tbl_info *search_tbl =
1366                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1367         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1368         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1369                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1370         u8 start_action = tbl->action;
1371         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1372         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1373         int ret;
1374
1375         for (;;) {
1376                 lq_sta->action_counter++;
1377                 switch (tbl->action) {
1378                 case IWL_SISO_SWITCH_ANTENNA1:
1379                 case IWL_SISO_SWITCH_ANTENNA2:
1380                         IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1381
1382                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1383                                                         tx_chains_num <= 1) ||
1384                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1385                                                         tx_chains_num <= 2))
1386                                 break;
1387
1388                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1389                                 break;
1390
1391                         memcpy(search_tbl, tbl, sz);
1392                         if (rs_toggle_antenna(valid_tx_ant,
1393                                        &search_tbl->current_rate, search_tbl))
1394                                 goto out;
1395                         break;
1396                 case IWL_SISO_SWITCH_MIMO2_AB:
1397                 case IWL_SISO_SWITCH_MIMO2_AC:
1398                 case IWL_SISO_SWITCH_MIMO2_BC:
1399                         IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1400                         memcpy(search_tbl, tbl, sz);
1401                         search_tbl->is_SGI = 0;
1402
1403                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1404                                 search_tbl->ant_type = ANT_AB;
1405                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1406                                 search_tbl->ant_type = ANT_AC;
1407                         else
1408                                 search_tbl->ant_type = ANT_BC;
1409
1410                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1411                                 break;
1412
1413                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1414                                                  search_tbl, index);
1415                         if (!ret)
1416                                 goto out;
1417                         break;
1418                 case IWL_SISO_SWITCH_GI:
1419                         if (!tbl->is_fat &&
1420                                 !(priv->current_ht_config.sgf &
1421                                                 HT_SHORT_GI_20MHZ))
1422                                 break;
1423                         if (tbl->is_fat &&
1424                                 !(priv->current_ht_config.sgf &
1425                                                 HT_SHORT_GI_40MHZ))
1426                                 break;
1427
1428                         IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1429
1430                         memcpy(search_tbl, tbl, sz);
1431                         if (is_green) {
1432                                 if (!tbl->is_SGI)
1433                                         break;
1434                                 else
1435                                         IWL_ERR(priv,
1436                                                 "SGI was set in GF+SISO\n");
1437                         }
1438                         search_tbl->is_SGI = !tbl->is_SGI;
1439                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1440                         if (tbl->is_SGI) {
1441                                 s32 tpt = lq_sta->last_tpt / 100;
1442                                 if (tpt >= search_tbl->expected_tpt[index])
1443                                         break;
1444                         }
1445                         search_tbl->current_rate =
1446                                 rate_n_flags_from_tbl(priv, search_tbl,
1447                                                       index, is_green);
1448                         goto out;
1449                 }
1450                 tbl->action++;
1451                 if (tbl->action > IWL_SISO_SWITCH_GI)
1452                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1453
1454                 if (tbl->action == start_action)
1455                         break;
1456         }
1457         search_tbl->lq_type = LQ_NONE;
1458         return 0;
1459
1460  out:
1461         lq_sta->search_better_tbl = 1;
1462         tbl->action++;
1463         if (tbl->action > IWL_SISO_SWITCH_GI)
1464                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1465         return 0;
1466 }
1467
1468 /*
1469  * Try to switch to new modulation mode from MIMO
1470  */
1471 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1472                                  struct iwl_lq_sta *lq_sta,
1473                                  struct ieee80211_conf *conf,
1474                                  struct ieee80211_sta *sta, int index)
1475 {
1476         s8 is_green = lq_sta->is_green;
1477         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1478         struct iwl_scale_tbl_info *search_tbl =
1479                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1480         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1481         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1482                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1483         u8 start_action = tbl->action;
1484         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1485         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1486         int ret;
1487
1488         for (;;) {
1489                 lq_sta->action_counter++;
1490                 switch (tbl->action) {
1491                 case IWL_MIMO2_SWITCH_ANTENNA1:
1492                 case IWL_MIMO2_SWITCH_ANTENNA2:
1493                         IWL_DEBUG_RATE("LQ: MIMO toggle Antennas\n");
1494
1495                         if (tx_chains_num <= 2)
1496                                 break;
1497
1498                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1499                                 break;
1500
1501                         memcpy(search_tbl, tbl, sz);
1502                         if (rs_toggle_antenna(valid_tx_ant,
1503                                        &search_tbl->current_rate, search_tbl))
1504                                 goto out;
1505                         break;
1506                 case IWL_MIMO2_SWITCH_SISO_A:
1507                 case IWL_MIMO2_SWITCH_SISO_B:
1508                 case IWL_MIMO2_SWITCH_SISO_C:
1509                         IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1510
1511                         /* Set up new search table for SISO */
1512                         memcpy(search_tbl, tbl, sz);
1513
1514                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1515                                 search_tbl->ant_type = ANT_A;
1516                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1517                                 search_tbl->ant_type = ANT_B;
1518                         else
1519                                 search_tbl->ant_type = ANT_C;
1520
1521                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1522                                 break;
1523
1524                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1525                                                  search_tbl, index);
1526                         if (!ret)
1527                                 goto out;
1528
1529                         break;
1530
1531                 case IWL_MIMO2_SWITCH_GI:
1532                         if (!tbl->is_fat &&
1533                                 !(priv->current_ht_config.sgf &
1534                                                 HT_SHORT_GI_20MHZ))
1535                                 break;
1536                         if (tbl->is_fat &&
1537                                 !(priv->current_ht_config.sgf &
1538                                                 HT_SHORT_GI_40MHZ))
1539                                 break;
1540
1541                         IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1542
1543                         /* Set up new search table for MIMO */
1544                         memcpy(search_tbl, tbl, sz);
1545                         search_tbl->is_SGI = !tbl->is_SGI;
1546                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1547                         /*
1548                          * If active table already uses the fastest possible
1549                          * modulation (dual stream with short guard interval),
1550                          * and it's working well, there's no need to look
1551                          * for a better type of modulation!
1552                          */
1553                         if (tbl->is_SGI) {
1554                                 s32 tpt = lq_sta->last_tpt / 100;
1555                                 if (tpt >= search_tbl->expected_tpt[index])
1556                                         break;
1557                         }
1558                         search_tbl->current_rate =
1559                                 rate_n_flags_from_tbl(priv, search_tbl,
1560                                                       index, is_green);
1561                         goto out;
1562
1563                 }
1564                 tbl->action++;
1565                 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1566                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1567
1568                 if (tbl->action == start_action)
1569                         break;
1570         }
1571         search_tbl->lq_type = LQ_NONE;
1572         return 0;
1573  out:
1574         lq_sta->search_better_tbl = 1;
1575         tbl->action++;
1576         if (tbl->action > IWL_MIMO2_SWITCH_GI)
1577                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1578         return 0;
1579
1580 }
1581
1582 /*
1583  * Check whether we should continue using same modulation mode, or
1584  * begin search for a new mode, based on:
1585  * 1) # tx successes or failures while using this mode
1586  * 2) # times calling this function
1587  * 3) elapsed time in this mode (not used, for now)
1588  */
1589 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1590 {
1591         struct iwl_scale_tbl_info *tbl;
1592         int i;
1593         int active_tbl;
1594         int flush_interval_passed = 0;
1595         struct iwl_priv *priv;
1596
1597         priv = lq_sta->drv;
1598         active_tbl = lq_sta->active_tbl;
1599
1600         tbl = &(lq_sta->lq_info[active_tbl]);
1601
1602         /* If we've been disallowing search, see if we should now allow it */
1603         if (lq_sta->stay_in_tbl) {
1604
1605                 /* Elapsed time using current modulation mode */
1606                 if (lq_sta->flush_timer)
1607                         flush_interval_passed =
1608                             time_after(jiffies,
1609                                        (unsigned long)(lq_sta->flush_timer +
1610                                         IWL_RATE_SCALE_FLUSH_INTVL));
1611
1612                 /*
1613                  * Check if we should allow search for new modulation mode.
1614                  * If many frames have failed or succeeded, or we've used
1615                  * this same modulation for a long time, allow search, and
1616                  * reset history stats that keep track of whether we should
1617                  * allow a new search.  Also (below) reset all bitmaps and
1618                  * stats in active history.
1619                  */
1620                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1621                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1622                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1623                      && (flush_interval_passed))) {
1624                         IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1625                                      lq_sta->total_failed,
1626                                      lq_sta->total_success,
1627                                      flush_interval_passed);
1628
1629                         /* Allow search for new mode */
1630                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1631                         lq_sta->total_failed = 0;
1632                         lq_sta->total_success = 0;
1633                         lq_sta->flush_timer = 0;
1634
1635                 /*
1636                  * Else if we've used this modulation mode enough repetitions
1637                  * (regardless of elapsed time or success/failure), reset
1638                  * history bitmaps and rate-specific stats for all rates in
1639                  * active table.
1640                  */
1641                 } else {
1642                         lq_sta->table_count++;
1643                         if (lq_sta->table_count >=
1644                             lq_sta->table_count_limit) {
1645                                 lq_sta->table_count = 0;
1646
1647                                 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1648                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1649                                         rs_rate_scale_clear_window(
1650                                                 &(tbl->win[i]));
1651                         }
1652                 }
1653
1654                 /* If transitioning to allow "search", reset all history
1655                  * bitmaps and stats in active table (this will become the new
1656                  * "search" table). */
1657                 if (!lq_sta->stay_in_tbl) {
1658                         for (i = 0; i < IWL_RATE_COUNT; i++)
1659                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1660                 }
1661         }
1662 }
1663
1664 /*
1665  * Do rate scaling and search for new modulation mode.
1666  */
1667 static void rs_rate_scale_perform(struct iwl_priv *priv,
1668                                   struct ieee80211_hdr *hdr,
1669                                   struct ieee80211_sta *sta,
1670                                   struct iwl_lq_sta *lq_sta)
1671 {
1672         struct ieee80211_hw *hw = priv->hw;
1673         struct ieee80211_conf *conf = &hw->conf;
1674         int low = IWL_RATE_INVALID;
1675         int high = IWL_RATE_INVALID;
1676         int index;
1677         int i;
1678         struct iwl_rate_scale_data *window = NULL;
1679         int current_tpt = IWL_INVALID_VALUE;
1680         int low_tpt = IWL_INVALID_VALUE;
1681         int high_tpt = IWL_INVALID_VALUE;
1682         u32 fail_count;
1683         s8 scale_action = 0;
1684         u16 rate_mask;
1685         u8 update_lq = 0;
1686         struct iwl_scale_tbl_info *tbl, *tbl1;
1687         u16 rate_scale_index_msk = 0;
1688         u32 rate;
1689         u8 is_green = 0;
1690         u8 active_tbl = 0;
1691         u8 done_search = 0;
1692         u16 high_low;
1693         s32 sr;
1694         u8 tid = MAX_TID_COUNT;
1695
1696         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1697
1698         /* Send management frames and broadcast/multicast data using
1699          * lowest rate. */
1700         /* TODO: this could probably be improved.. */
1701         if (!ieee80211_is_data(hdr->frame_control) ||
1702             is_multicast_ether_addr(hdr->addr1))
1703                 return;
1704
1705         if (!sta || !lq_sta)
1706                 return;
1707
1708         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1709
1710         tid = rs_tl_add_packet(lq_sta, hdr);
1711
1712         /*
1713          * Select rate-scale / modulation-mode table to work with in
1714          * the rest of this function:  "search" if searching for better
1715          * modulation mode, or "active" if doing rate scaling within a mode.
1716          */
1717         if (!lq_sta->search_better_tbl)
1718                 active_tbl = lq_sta->active_tbl;
1719         else
1720                 active_tbl = 1 - lq_sta->active_tbl;
1721
1722         tbl = &(lq_sta->lq_info[active_tbl]);
1723         is_green = lq_sta->is_green;
1724
1725         /* current tx rate */
1726         index = lq_sta->last_txrate_idx;
1727
1728         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1729                        tbl->lq_type);
1730
1731         /* rates available for this association, and for modulation mode */
1732         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1733
1734         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1735
1736         /* mask with station rate restriction */
1737         if (is_legacy(tbl->lq_type)) {
1738                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1739                         /* supp_rates has no CCK bits in A mode */
1740                         rate_scale_index_msk = (u16) (rate_mask &
1741                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1742                 else
1743                         rate_scale_index_msk = (u16) (rate_mask &
1744                                                       lq_sta->supp_rates);
1745
1746         } else
1747                 rate_scale_index_msk = rate_mask;
1748
1749         if (!rate_scale_index_msk)
1750                 rate_scale_index_msk = rate_mask;
1751
1752         if (!((1 << index) & rate_scale_index_msk)) {
1753                 IWL_ERR(priv, "Current Rate is not valid\n");
1754                 return;
1755         }
1756
1757         /* Get expected throughput table and history window for current rate */
1758         if (!tbl->expected_tpt) {
1759                 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
1760                 return;
1761         }
1762
1763         /* force user max rate if set by user */
1764         if ((lq_sta->max_rate_idx != -1) &&
1765             (lq_sta->max_rate_idx < index)) {
1766                 index = lq_sta->max_rate_idx;
1767                 update_lq = 1;
1768                 window = &(tbl->win[index]);
1769                 goto lq_update;
1770         }
1771
1772         window = &(tbl->win[index]);
1773
1774         /*
1775          * If there is not enough history to calculate actual average
1776          * throughput, keep analyzing results of more tx frames, without
1777          * changing rate or mode (bypass most of the rest of this function).
1778          * Set up new rate table in uCode only if old rate is not supported
1779          * in current association (use new rate found above).
1780          */
1781         fail_count = window->counter - window->success_counter;
1782         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1783                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1784                 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1785                                "for index %d\n",
1786                                window->success_counter, window->counter, index);
1787
1788                 /* Can't calculate this yet; not enough history */
1789                 window->average_tpt = IWL_INVALID_VALUE;
1790
1791                 /* Should we stay with this modulation mode,
1792                  * or search for a new one? */
1793                 rs_stay_in_table(lq_sta);
1794
1795                 goto out;
1796         }
1797
1798         /* Else we have enough samples; calculate estimate of
1799          * actual average throughput */
1800
1801         BUG_ON(window->average_tpt != ((window->success_ratio *
1802                         tbl->expected_tpt[index] + 64) / 128));
1803
1804         /* If we are searching for better modulation mode, check success. */
1805         if (lq_sta->search_better_tbl) {
1806
1807                 /* If good success, continue using the "search" mode;
1808                  * no need to send new link quality command, since we're
1809                  * continuing to use the setup that we've been trying. */
1810                 if (window->average_tpt > lq_sta->last_tpt) {
1811
1812                         IWL_DEBUG_RATE("LQ: SWITCHING TO NEW TABLE "
1813                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1814                                         window->success_ratio,
1815                                         window->average_tpt,
1816                                         lq_sta->last_tpt);
1817
1818                         if (!is_legacy(tbl->lq_type))
1819                                 lq_sta->enable_counter = 1;
1820
1821                         /* Swap tables; "search" becomes "active" */
1822                         lq_sta->active_tbl = active_tbl;
1823                         current_tpt = window->average_tpt;
1824
1825                 /* Else poor success; go back to mode in "active" table */
1826                 } else {
1827
1828                         IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1829                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1830                                         window->success_ratio,
1831                                         window->average_tpt,
1832                                         lq_sta->last_tpt);
1833
1834                         /* Nullify "search" table */
1835                         tbl->lq_type = LQ_NONE;
1836
1837                         /* Revert to "active" table */
1838                         active_tbl = lq_sta->active_tbl;
1839                         tbl = &(lq_sta->lq_info[active_tbl]);
1840
1841                         /* Revert to "active" rate and throughput info */
1842                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1843                         current_tpt = lq_sta->last_tpt;
1844
1845                         /* Need to set up a new rate table in uCode */
1846                         update_lq = 1;
1847                 }
1848
1849                 /* Either way, we've made a decision; modulation mode
1850                  * search is done, allow rate adjustment next time. */
1851                 lq_sta->search_better_tbl = 0;
1852                 done_search = 1;        /* Don't switch modes below! */
1853                 goto lq_update;
1854         }
1855
1856         /* (Else) not in search of better modulation mode, try for better
1857          * starting rate, while staying in this mode. */
1858         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1859                                         tbl->lq_type);
1860         low = high_low & 0xff;
1861         high = (high_low >> 8) & 0xff;
1862
1863         /* If user set max rate, dont allow higher than user constrain */
1864         if ((lq_sta->max_rate_idx != -1) &&
1865             (lq_sta->max_rate_idx < high))
1866                 high = IWL_RATE_INVALID;
1867
1868         sr = window->success_ratio;
1869
1870         /* Collect measured throughputs for current and adjacent rates */
1871         current_tpt = window->average_tpt;
1872         if (low != IWL_RATE_INVALID)
1873                 low_tpt = tbl->win[low].average_tpt;
1874         if (high != IWL_RATE_INVALID)
1875                 high_tpt = tbl->win[high].average_tpt;
1876
1877         scale_action = 0;
1878
1879         /* Too many failures, decrease rate */
1880         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1881                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1882                 scale_action = -1;
1883
1884         /* No throughput measured yet for adjacent rates; try increase. */
1885         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1886                    (high_tpt == IWL_INVALID_VALUE)) {
1887
1888                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1889                         scale_action = 1;
1890                 else if (low != IWL_RATE_INVALID)
1891                         scale_action = -1;
1892         }
1893
1894         /* Both adjacent throughputs are measured, but neither one has better
1895          * throughput; we're using the best rate, don't change it! */
1896         else if ((low_tpt != IWL_INVALID_VALUE) &&
1897                  (high_tpt != IWL_INVALID_VALUE) &&
1898                  (low_tpt < current_tpt) &&
1899                  (high_tpt < current_tpt))
1900                 scale_action = 0;
1901
1902         /* At least one adjacent rate's throughput is measured,
1903          * and may have better performance. */
1904         else {
1905                 /* Higher adjacent rate's throughput is measured */
1906                 if (high_tpt != IWL_INVALID_VALUE) {
1907                         /* Higher rate has better throughput */
1908                         if (high_tpt > current_tpt &&
1909                                         sr >= IWL_RATE_INCREASE_TH) {
1910                                 scale_action = 1;
1911                         } else {
1912                                 IWL_DEBUG_RATE
1913                                     ("decrease rate because of high tpt\n");
1914                                 scale_action = -1;
1915                         }
1916
1917                 /* Lower adjacent rate's throughput is measured */
1918                 } else if (low_tpt != IWL_INVALID_VALUE) {
1919                         /* Lower rate has better throughput */
1920                         if (low_tpt > current_tpt) {
1921                                 IWL_DEBUG_RATE
1922                                     ("decrease rate because of low tpt\n");
1923                                 scale_action = -1;
1924                         } else if (sr >= IWL_RATE_INCREASE_TH) {
1925                                 scale_action = 1;
1926                         }
1927                 }
1928         }
1929
1930         /* Sanity check; asked for decrease, but success rate or throughput
1931          * has been good at old rate.  Don't change it. */
1932         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1933                     ((sr > IWL_RATE_HIGH_TH) ||
1934                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1935                 scale_action = 0;
1936
1937         switch (scale_action) {
1938         case -1:
1939                 /* Decrease starting rate, update uCode's rate table */
1940                 if (low != IWL_RATE_INVALID) {
1941                         update_lq = 1;
1942                         index = low;
1943                 }
1944                 break;
1945         case 1:
1946                 /* Increase starting rate, update uCode's rate table */
1947                 if (high != IWL_RATE_INVALID) {
1948                         update_lq = 1;
1949                         index = high;
1950                 }
1951
1952                 break;
1953         case 0:
1954                 /* No change */
1955         default:
1956                 break;
1957         }
1958
1959         IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1960                     "high %d type %d\n",
1961                      index, scale_action, low, high, tbl->lq_type);
1962
1963 lq_update:
1964         /* Replace uCode's rate table for the destination station. */
1965         if (update_lq) {
1966                 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
1967                 rs_fill_link_cmd(priv, lq_sta, rate);
1968                 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1969         }
1970
1971         /* Should we stay with this modulation mode, or search for a new one? */
1972         rs_stay_in_table(lq_sta);
1973
1974         /*
1975          * Search for new modulation mode if we're:
1976          * 1)  Not changing rates right now
1977          * 2)  Not just finishing up a search
1978          * 3)  Allowing a new search
1979          */
1980         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1981                 /* Save current throughput to compare with "search" throughput*/
1982                 lq_sta->last_tpt = current_tpt;
1983
1984                 /* Select a new "search" modulation mode to try.
1985                  * If one is found, set up the new "search" table. */
1986                 if (is_legacy(tbl->lq_type))
1987                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1988                 else if (is_siso(tbl->lq_type))
1989                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1990                 else
1991                         rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1992
1993                 /* If new "search" mode was selected, set up in uCode table */
1994                 if (lq_sta->search_better_tbl) {
1995                         /* Access the "search" table, clear its history. */
1996                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1997                         for (i = 0; i < IWL_RATE_COUNT; i++)
1998                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1999
2000                         /* Use new "search" start rate */
2001                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2002
2003                         IWL_DEBUG_RATE("Switch current  mcs: %X index: %d\n",
2004                                      tbl->current_rate, index);
2005                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2006                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2007                 }
2008
2009                 /* If the "active" (non-search) mode was legacy,
2010                  * and we've tried switching antennas,
2011                  * but we haven't been able to try HT modes (not available),
2012                  * stay with best antenna legacy modulation for a while
2013                  * before next round of mode comparisons. */
2014                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2015                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2016                     lq_sta->action_counter >= 1) {
2017                         lq_sta->action_counter = 0;
2018                         IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
2019                         rs_set_stay_in_table(priv, 1, lq_sta);
2020                 }
2021
2022                 /* If we're in an HT mode, and all 3 mode switch actions
2023                  * have been tried and compared, stay in this best modulation
2024                  * mode for a while before next round of mode comparisons. */
2025                 if (lq_sta->enable_counter &&
2026                     (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2027                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2028                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2029                             (tid != MAX_TID_COUNT)) {
2030                                 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
2031                                 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2032                         }
2033                         lq_sta->action_counter = 0;
2034                         rs_set_stay_in_table(priv, 0, lq_sta);
2035                 }
2036
2037         /*
2038          * Else, don't search for a new modulation mode.
2039          * Put new timestamp in stay-in-modulation-mode flush timer if:
2040          * 1)  Not changing rates right now
2041          * 2)  Not just finishing up a search
2042          * 3)  flush timer is empty
2043          */
2044         } else {
2045                 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2046                         lq_sta->flush_timer = jiffies;
2047         }
2048
2049 out:
2050         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2051         i = index;
2052         lq_sta->last_txrate_idx = i;
2053
2054         return;
2055 }
2056
2057
2058 static void rs_initialize_lq(struct iwl_priv *priv,
2059                              struct ieee80211_conf *conf,
2060                              struct ieee80211_sta *sta,
2061                              struct iwl_lq_sta *lq_sta)
2062 {
2063         struct iwl_scale_tbl_info *tbl;
2064         int rate_idx;
2065         int i;
2066         u32 rate;
2067         u8 use_green = rs_use_green(priv, conf);
2068         u8 active_tbl = 0;
2069         u8 valid_tx_ant;
2070
2071         if (!sta || !lq_sta)
2072                 goto out;
2073
2074         i = lq_sta->last_txrate_idx;
2075
2076         if ((lq_sta->lq.sta_id == 0xff) &&
2077             (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2078                 goto out;
2079
2080         valid_tx_ant = priv->hw_params.valid_tx_ant;
2081
2082         if (!lq_sta->search_better_tbl)
2083                 active_tbl = lq_sta->active_tbl;
2084         else
2085                 active_tbl = 1 - lq_sta->active_tbl;
2086
2087         tbl = &(lq_sta->lq_info[active_tbl]);
2088
2089         if ((i < 0) || (i >= IWL_RATE_COUNT))
2090                 i = 0;
2091
2092         rate = iwl_rates[i].plcp;
2093         tbl->ant_type = first_antenna(valid_tx_ant);
2094         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2095
2096         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2097                 rate |= RATE_MCS_CCK_MSK;
2098
2099         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2100         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2101             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2102
2103         rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2104         tbl->current_rate = rate;
2105         rs_set_expected_tpt_table(lq_sta, tbl);
2106         rs_fill_link_cmd(NULL, lq_sta, rate);
2107         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2108  out:
2109         return;
2110 }
2111
2112 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2113                         struct ieee80211_tx_rate_control *txrc)
2114 {
2115
2116         struct sk_buff *skb = txrc->skb;
2117         struct ieee80211_supported_band *sband = txrc->sband;
2118         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2119         struct ieee80211_conf *conf = &priv->hw->conf;
2120         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2121         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2122         struct iwl_lq_sta *lq_sta = priv_sta;
2123         int rate_idx;
2124         u64 mask_bit = 0;
2125
2126         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2127
2128         /* Get max rate if user set max rate */
2129         if (lq_sta) {
2130                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2131                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2132                     (lq_sta->max_rate_idx != -1))
2133                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2134                 if ((lq_sta->max_rate_idx < 0) ||
2135                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2136                         lq_sta->max_rate_idx = -1;
2137         }
2138
2139         if (sta)
2140                 mask_bit = sta->supp_rates[sband->band];
2141
2142         /* Send management frames and broadcast/multicast data using lowest
2143          * rate. */
2144         if (!ieee80211_is_data(hdr->frame_control) ||
2145             is_multicast_ether_addr(hdr->addr1) || !sta || !lq_sta) {
2146                 if (!mask_bit)
2147                         info->control.rates[0].idx =
2148                                         rate_lowest_index(sband, NULL);
2149                 else
2150                         info->control.rates[0].idx =
2151                                         rate_lowest_index(sband, sta);
2152                 return;
2153         }
2154
2155         rate_idx  = lq_sta->last_txrate_idx;
2156
2157         if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2158             !lq_sta->ibss_sta_added) {
2159                 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2160
2161                 if (sta_id == IWL_INVALID_STATION) {
2162                         IWL_DEBUG_RATE("LQ: ADD station %pM\n",
2163                                        hdr->addr1);
2164                         sta_id = iwl_add_station_flags(priv, hdr->addr1,
2165                                                         0, CMD_ASYNC, NULL);
2166                 }
2167                 if ((sta_id != IWL_INVALID_STATION)) {
2168                         lq_sta->lq.sta_id = sta_id;
2169                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2170                         lq_sta->ibss_sta_added = 1;
2171                         rs_initialize_lq(priv, conf, sta, lq_sta);
2172                 }
2173         }
2174
2175         if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT)
2176                 rate_idx = rate_lowest_index(sband, sta);
2177         else if (sband->band == IEEE80211_BAND_5GHZ)
2178                 rate_idx -= IWL_FIRST_OFDM_RATE;
2179
2180         info->control.rates[0].idx = rate_idx;
2181 }
2182
2183 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2184                           gfp_t gfp)
2185 {
2186         struct iwl_lq_sta *lq_sta;
2187         struct iwl_priv *priv;
2188         int i, j;
2189
2190         priv = (struct iwl_priv *)priv_rate;
2191         IWL_DEBUG_RATE("create station rate scale window\n");
2192
2193         lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2194
2195         if (lq_sta == NULL)
2196                 return NULL;
2197         lq_sta->lq.sta_id = 0xff;
2198
2199
2200         for (j = 0; j < LQ_SIZE; j++)
2201                 for (i = 0; i < IWL_RATE_COUNT; i++)
2202                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2203
2204         return lq_sta;
2205 }
2206
2207 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2208                          struct ieee80211_sta *sta, void *priv_sta)
2209 {
2210         int i, j;
2211         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2212         struct ieee80211_conf *conf = &priv->hw->conf;
2213         struct iwl_lq_sta *lq_sta = priv_sta;
2214         u16 mask_bit = 0;
2215
2216         lq_sta->flush_timer = 0;
2217         lq_sta->supp_rates = sta->supp_rates[sband->band];
2218         for (j = 0; j < LQ_SIZE; j++)
2219                 for (i = 0; i < IWL_RATE_COUNT; i++)
2220                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2221
2222         IWL_DEBUG_RATE("LQ: *** rate scale station global init ***\n");
2223         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2224          * the lowest or the highest rate.. Could consider using RSSI from
2225          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2226          * after assoc.. */
2227
2228         lq_sta->ibss_sta_added = 0;
2229         if (priv->iw_mode == NL80211_IFTYPE_AP) {
2230                 u8 sta_id = iwl_find_station(priv, sta->addr);
2231
2232                 /* for IBSS the call are from tasklet */
2233                 IWL_DEBUG_RATE("LQ: ADD station %pM\n", sta->addr);
2234
2235                 if (sta_id == IWL_INVALID_STATION) {
2236                         IWL_DEBUG_RATE("LQ: ADD station %pM\n", sta->addr);
2237                         sta_id = iwl_add_station_flags(priv, sta->addr,
2238                                                         0, CMD_ASYNC, NULL);
2239                 }
2240                 if ((sta_id != IWL_INVALID_STATION)) {
2241                         lq_sta->lq.sta_id = sta_id;
2242                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2243                 }
2244                 /* FIXME: this is w/a remove it later */
2245                 priv->assoc_station_added = 1;
2246         }
2247
2248         lq_sta->is_dup = 0;
2249         lq_sta->max_rate_idx = -1;
2250         lq_sta->is_green = rs_use_green(priv, conf);
2251         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2252         lq_sta->active_rate_basic = priv->active_rate_basic;
2253         lq_sta->band = priv->band;
2254         /*
2255          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2256          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2257          */
2258         lq_sta->active_siso_rate = sta->ht_cap.mcs.rx_mask[0] << 1;
2259         lq_sta->active_siso_rate |= sta->ht_cap.mcs.rx_mask[0] & 0x1;
2260         lq_sta->active_siso_rate &= ~((u16)0x2);
2261         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2262
2263         /* Same here */
2264         lq_sta->active_mimo2_rate = sta->ht_cap.mcs.rx_mask[1] << 1;
2265         lq_sta->active_mimo2_rate |= sta->ht_cap.mcs.rx_mask[1] & 0x1;
2266         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2267         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2268
2269         lq_sta->active_mimo3_rate = sta->ht_cap.mcs.rx_mask[2] << 1;
2270         lq_sta->active_mimo3_rate |= sta->ht_cap.mcs.rx_mask[2] & 0x1;
2271         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2272         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2273
2274         IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2275                      lq_sta->active_siso_rate,
2276                      lq_sta->active_mimo2_rate,
2277                      lq_sta->active_mimo3_rate);
2278
2279         /* These values will be overridden later */
2280         lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2281         lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2282
2283         /* as default allow aggregation for all tids */
2284         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2285         lq_sta->drv = priv;
2286
2287         /* Find highest tx rate supported by hardware and destination station */
2288         mask_bit = sta->supp_rates[sband->band] & lq_sta->active_legacy_rate;
2289         lq_sta->last_txrate_idx = 3;
2290         for (i = 0; i < sband->n_bitrates; i++)
2291                 if (mask_bit & BIT(i))
2292                         lq_sta->last_txrate_idx = i;
2293
2294         /* For MODE_IEEE80211A, skip over cck rates in global rate table */
2295         if (sband->band == IEEE80211_BAND_5GHZ)
2296                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2297
2298         rs_initialize_lq(priv, conf, sta, lq_sta);
2299 }
2300
2301 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2302                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2303 {
2304         struct iwl_scale_tbl_info tbl_type;
2305         int index = 0;
2306         int rate_idx;
2307         int repeat_rate = 0;
2308         u8 ant_toggle_cnt = 0;
2309         u8 use_ht_possible = 1;
2310         u8 valid_tx_ant = 0;
2311         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2312
2313         /* Override starting rate (index 0) if needed for debug purposes */
2314         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2315
2316         /* Interpret new_rate (rate_n_flags) */
2317         memset(&tbl_type, 0, sizeof(tbl_type));
2318         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2319                                   &tbl_type, &rate_idx);
2320
2321         /* How many times should we repeat the initial rate? */
2322         if (is_legacy(tbl_type.lq_type)) {
2323                 ant_toggle_cnt = 1;
2324                 repeat_rate = IWL_NUMBER_TRY;
2325         } else {
2326                 repeat_rate = IWL_HT_NUMBER_TRY;
2327         }
2328
2329         lq_cmd->general_params.mimo_delimiter =
2330                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2331
2332         /* Fill 1st table entry (index 0) */
2333         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2334
2335         if (num_of_ant(tbl_type.ant_type) == 1) {
2336                 lq_cmd->general_params.single_stream_ant_msk =
2337                                                 tbl_type.ant_type;
2338         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2339                 lq_cmd->general_params.dual_stream_ant_msk =
2340                                                 tbl_type.ant_type;
2341         } /* otherwise we don't modify the existing value */
2342
2343         index++;
2344         repeat_rate--;
2345
2346         if (priv)
2347                 valid_tx_ant = priv->hw_params.valid_tx_ant;
2348
2349         /* Fill rest of rate table */
2350         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2351                 /* Repeat initial/next rate.
2352                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2353                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2354                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2355                         if (is_legacy(tbl_type.lq_type)) {
2356                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2357                                         ant_toggle_cnt++;
2358                                 else if (priv &&
2359                                          rs_toggle_antenna(valid_tx_ant,
2360                                                         &new_rate, &tbl_type))
2361                                         ant_toggle_cnt = 1;
2362 }
2363
2364                         /* Override next rate if needed for debug purposes */
2365                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2366
2367                         /* Fill next table entry */
2368                         lq_cmd->rs_table[index].rate_n_flags =
2369                                         cpu_to_le32(new_rate);
2370                         repeat_rate--;
2371                         index++;
2372                 }
2373
2374                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2375                                                 &rate_idx);
2376
2377                 /* Indicate to uCode which entries might be MIMO.
2378                  * If initial rate was MIMO, this will finally end up
2379                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2380                 if (is_mimo(tbl_type.lq_type))
2381                         lq_cmd->general_params.mimo_delimiter = index;
2382
2383                 /* Get next rate */
2384                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2385                                              use_ht_possible);
2386
2387                 /* How many times should we repeat the next rate? */
2388                 if (is_legacy(tbl_type.lq_type)) {
2389                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2390                                 ant_toggle_cnt++;
2391                         else if (priv &&
2392                                  rs_toggle_antenna(valid_tx_ant,
2393                                                    &new_rate, &tbl_type))
2394                                 ant_toggle_cnt = 1;
2395
2396                         repeat_rate = IWL_NUMBER_TRY;
2397                 } else {
2398                         repeat_rate = IWL_HT_NUMBER_TRY;
2399                 }
2400
2401                 /* Don't allow HT rates after next pass.
2402                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2403                 use_ht_possible = 0;
2404
2405                 /* Override next rate if needed for debug purposes */
2406                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2407
2408                 /* Fill next table entry */
2409                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2410
2411                 index++;
2412                 repeat_rate--;
2413         }
2414
2415         lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2416         lq_cmd->agg_params.agg_dis_start_th = 3;
2417         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2418 }
2419
2420 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2421 {
2422         return hw->priv;
2423 }
2424 /* rate scale requires free function to be implemented */
2425 static void rs_free(void *priv_rate)
2426 {
2427         return;
2428 }
2429
2430 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2431                         void *priv_sta)
2432 {
2433         struct iwl_lq_sta *lq_sta = priv_sta;
2434         struct iwl_priv *priv __maybe_unused = priv_r;
2435
2436         IWL_DEBUG_RATE("enter\n");
2437         kfree(lq_sta);
2438         IWL_DEBUG_RATE("leave\n");
2439 }
2440
2441
2442 #ifdef CONFIG_MAC80211_DEBUGFS
2443 static int open_file_generic(struct inode *inode, struct file *file)
2444 {
2445         file->private_data = inode->i_private;
2446         return 0;
2447 }
2448 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2449                              u32 *rate_n_flags, int index)
2450 {
2451         struct iwl_priv *priv;
2452
2453         priv = lq_sta->drv;
2454         if (lq_sta->dbg_fixed_rate) {
2455                 if (index < 12) {
2456                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2457                 } else {
2458                         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2459                                 *rate_n_flags = 0x800D;
2460                         else
2461                                 *rate_n_flags = 0x820A;
2462                 }
2463                 IWL_DEBUG_RATE("Fixed rate ON\n");
2464         } else {
2465                 IWL_DEBUG_RATE("Fixed rate OFF\n");
2466         }
2467 }
2468
2469 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2470                         const char __user *user_buf, size_t count, loff_t *ppos)
2471 {
2472         struct iwl_lq_sta *lq_sta = file->private_data;
2473         struct iwl_priv *priv;
2474         char buf[64];
2475         int buf_size;
2476         u32 parsed_rate;
2477
2478         priv = lq_sta->drv;
2479         memset(buf, 0, sizeof(buf));
2480         buf_size = min(count, sizeof(buf) -  1);
2481         if (copy_from_user(buf, user_buf, buf_size))
2482                 return -EFAULT;
2483
2484         if (sscanf(buf, "%x", &parsed_rate) == 1)
2485                 lq_sta->dbg_fixed_rate = parsed_rate;
2486         else
2487                 lq_sta->dbg_fixed_rate = 0;
2488
2489         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2490         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2491         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2492         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2493
2494         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2495                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2496
2497         if (lq_sta->dbg_fixed_rate) {
2498                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2499                 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2500         }
2501
2502         return count;
2503 }
2504
2505 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2506                         char __user *user_buf, size_t count, loff_t *ppos)
2507 {
2508         char buff[1024];
2509         int desc = 0;
2510         int i = 0;
2511
2512         struct iwl_lq_sta *lq_sta = file->private_data;
2513
2514         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2515         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2516                         lq_sta->total_failed, lq_sta->total_success,
2517                         lq_sta->active_legacy_rate);
2518         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2519                         lq_sta->dbg_fixed_rate);
2520         desc += sprintf(buff+desc, "general:"
2521                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2522                 lq_sta->lq.general_params.flags,
2523                 lq_sta->lq.general_params.mimo_delimiter,
2524                 lq_sta->lq.general_params.single_stream_ant_msk,
2525                 lq_sta->lq.general_params.dual_stream_ant_msk);
2526
2527         desc += sprintf(buff+desc, "agg:"
2528                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2529                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2530                         lq_sta->lq.agg_params.agg_dis_start_th,
2531                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2532
2533         desc += sprintf(buff+desc,
2534                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2535                         lq_sta->lq.general_params.start_rate_index[0],
2536                         lq_sta->lq.general_params.start_rate_index[1],
2537                         lq_sta->lq.general_params.start_rate_index[2],
2538                         lq_sta->lq.general_params.start_rate_index[3]);
2539
2540
2541         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2542                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2543                         i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2544
2545         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2546 }
2547
2548 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2549         .write = rs_sta_dbgfs_scale_table_write,
2550         .read = rs_sta_dbgfs_scale_table_read,
2551         .open = open_file_generic,
2552 };
2553 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2554                         char __user *user_buf, size_t count, loff_t *ppos)
2555 {
2556         char buff[1024];
2557         int desc = 0;
2558         int i, j;
2559
2560         struct iwl_lq_sta *lq_sta = file->private_data;
2561         for (i = 0; i < LQ_SIZE; i++) {
2562                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2563                                 "rate=0x%X\n",
2564                                 lq_sta->active_tbl == i ? "*" : "x",
2565                                 lq_sta->lq_info[i].lq_type,
2566                                 lq_sta->lq_info[i].is_SGI,
2567                                 lq_sta->lq_info[i].is_fat,
2568                                 lq_sta->lq_info[i].is_dup,
2569                                 lq_sta->lq_info[i].current_rate);
2570                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2571                         desc += sprintf(buff+desc,
2572                                 "counter=%d success=%d %%=%d\n",
2573                                 lq_sta->lq_info[i].win[j].counter,
2574                                 lq_sta->lq_info[i].win[j].success_counter,
2575                                 lq_sta->lq_info[i].win[j].success_ratio);
2576                 }
2577         }
2578         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2579 }
2580
2581 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2582         .read = rs_sta_dbgfs_stats_table_read,
2583         .open = open_file_generic,
2584 };
2585
2586 static void rs_add_debugfs(void *priv, void *priv_sta,
2587                                         struct dentry *dir)
2588 {
2589         struct iwl_lq_sta *lq_sta = priv_sta;
2590         lq_sta->rs_sta_dbgfs_scale_table_file =
2591                 debugfs_create_file("rate_scale_table", 0600, dir,
2592                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2593         lq_sta->rs_sta_dbgfs_stats_table_file =
2594                 debugfs_create_file("rate_stats_table", 0600, dir,
2595                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2596         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2597                 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2598                 &lq_sta->tx_agg_tid_en);
2599
2600 }
2601
2602 static void rs_remove_debugfs(void *priv, void *priv_sta)
2603 {
2604         struct iwl_lq_sta *lq_sta = priv_sta;
2605         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2606         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2607         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2608 }
2609 #endif
2610
2611 static struct rate_control_ops rs_ops = {
2612         .module = NULL,
2613         .name = RS_NAME,
2614         .tx_status = rs_tx_status,
2615         .get_rate = rs_get_rate,
2616         .rate_init = rs_rate_init,
2617         .alloc = rs_alloc,
2618         .free = rs_free,
2619         .alloc_sta = rs_alloc_sta,
2620         .free_sta = rs_free_sta,
2621 #ifdef CONFIG_MAC80211_DEBUGFS
2622         .add_sta_debugfs = rs_add_debugfs,
2623         .remove_sta_debugfs = rs_remove_debugfs,
2624 #endif
2625 };
2626
2627 int iwlagn_rate_control_register(void)
2628 {
2629         return ieee80211_rate_control_register(&rs_ops);
2630 }
2631
2632 void iwlagn_rate_control_unregister(void)
2633 {
2634         ieee80211_rate_control_unregister(&rs_ops);
2635 }
2636