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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  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
 152         struct iwl_link_quality_cmd lq;
 153         struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
 154         struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
 155         u8 tx_agg_tid_en;
 156 #ifdef CONFIG_MAC80211_DEBUGFS
 157         struct dentry *rs_sta_dbgfs_scale_table_file;
 158         struct dentry *rs_sta_dbgfs_stats_table_file;
 159         struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
 160         u32 dbg_fixed_rate;
 161 #endif
 162         struct iwl_priv *drv;
 163
 164         /* used to be in sta_info */
 165         int last_txrate_idx;
 166 };
 167
 168 static void rs_rate_scale_perform(struct iwl_priv *priv,
 169                                    struct ieee80211_hdr *hdr,
 170                                    struct ieee80211_sta *sta,
 171                                    struct iwl_lq_sta *lq_sta);
 172 static void rs_fill_link_cmd(const struct iwl_priv *priv,
 173                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 174
 175
 176 #ifdef CONFIG_MAC80211_DEBUGFS
 177 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 178                              u32 *rate_n_flags, int index);
 179 #else
 180 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 181                              u32 *rate_n_flags, int index)
 182 {}
 183 #endif
 184
 185 /*
 186  * Expected throughput metrics for following rates:
 187  * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 188  * "G" is the only table that supports CCK (the first 4 rates).
 189  */
 190 /*FIXME:RS:need to separate tables for MIMO2/MIMO3*/
 191 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
 192         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
 193 };
 194
 195 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
 196         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
 197 };
 198
 199 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
 200         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
 201 };
 202
 203 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
 204         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
 205 };
 206
 207 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
 208         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
 209 };
 210
 211 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
 212         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
 213 };
 214
 215 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
 216         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
 217 };
 218
 219 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
 220         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
 221 };
 222
 223 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
 224         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
 225 };
 226
 227 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
 228         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
 229 };
 230
 231 static inline u8 rs_extract_rate(u32 rate_n_flags)
 232 {
 233         return (u8)(rate_n_flags & 0xFF);
 234 }
 235
 236 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 237 {
 238         window->data = 0;
 239         window->success_counter = 0;
 240         window->success_ratio = IWL_INVALID_VALUE;
 241         window->counter = 0;
 242         window->average_tpt = IWL_INVALID_VALUE;
 243         window->stamp = 0;
 244 }
 245
 246 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 247 {
 248         return (ant_type & valid_antenna) == ant_type;
 249 }
 250
 251 /*
 252  *      removes the old data from the statistics. All data that is older than
 253  *      TID_MAX_TIME_DIFF, will be deleted.
 254  */
 255 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 256 {
 257         /* The oldest age we want to keep */
 258         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 259
 260         while (tl->queue_count &&
 261                (tl->time_stamp < oldest_time)) {
 262                 tl->total -= tl->packet_count[tl->head];
 263                 tl->packet_count[tl->head] = 0;
 264                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 265                 tl->queue_count--;
 266                 tl->head++;
 267                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 268                         tl->head = 0;
 269         }
 270 }
 271
 272 /*
 273  *      increment traffic load value for tid and also remove
 274  *      any old values if passed the certain time period
 275  */
 276 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 277                            struct ieee80211_hdr *hdr)
 278 {
 279         u32 curr_time = jiffies_to_msecs(jiffies);
 280         u32 time_diff;
 281         s32 index;
 282         struct iwl_traffic_load *tl = NULL;
 283         u8 tid;
 284
 285         if (ieee80211_is_data_qos(hdr->frame_control)) {
 286                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 287                 tid = qc[0] & 0xf;
 288         } else
 289                 return MAX_TID_COUNT;
 290
 291         tl = &lq_data->load[tid];
 292
 293         curr_time -= curr_time % TID_ROUND_VALUE;
 294
 295         /* Happens only for the first packet. Initialize the data */
 296         if (!(tl->queue_count)) {
 297                 tl->total = 1;
 298                 tl->time_stamp = curr_time;
 299                 tl->queue_count = 1;
 300                 tl->head = 0;
 301                 tl->packet_count[0] = 1;
 302                 return MAX_TID_COUNT;
 303         }
 304
 305         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 306         index = time_diff / TID_QUEUE_CELL_SPACING;
 307
 308         /* The history is too long: remove data that is older than */
 309         /* TID_MAX_TIME_DIFF */
 310         if (index >= TID_QUEUE_MAX_SIZE)
 311                 rs_tl_rm_old_stats(tl, curr_time);
 312
 313         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 314         tl->packet_count[index] = tl->packet_count[index] + 1;
 315         tl->total = tl->total + 1;
 316
 317         if ((index + 1) > tl->queue_count)
 318                 tl->queue_count = index + 1;
 319
 320         return tid;
 321 }
 322
 323 /*
 324         get the traffic load value for tid
 325 */
 326 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 327 {
 328         u32 curr_time = jiffies_to_msecs(jiffies);
 329         u32 time_diff;
 330         s32 index;
 331         struct iwl_traffic_load *tl = NULL;
 332
 333         if (tid >= TID_MAX_LOAD_COUNT)
 334                 return 0;
 335
 336         tl = &(lq_data->load[tid]);
 337
 338         curr_time -= curr_time % TID_ROUND_VALUE;
 339
 340         if (!(tl->queue_count))
 341                 return 0;
 342
 343         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 344         index = time_diff / TID_QUEUE_CELL_SPACING;
 345
 346         /* The history is too long: remove data that is older than */
 347         /* TID_MAX_TIME_DIFF */
 348         if (index >= TID_QUEUE_MAX_SIZE)
 349                 rs_tl_rm_old_stats(tl, curr_time);
 350
 351         return tl->total;
 352 }
 353
 354 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 355                                       struct iwl_lq_sta *lq_data, u8 tid,
 356                                       struct ieee80211_sta *sta)
 357 {
 358         if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
 359                 IWL_DEBUG_HT("Starting Tx agg: STA: %pM tid: %d\n",
 360                                 sta->addr, tid);
 361                 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
 362         }
 363 }
 364
 365 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 366                               struct iwl_lq_sta *lq_data,
 367                               struct ieee80211_sta *sta)
 368 {
 369         if ((tid < TID_MAX_LOAD_COUNT))
 370                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 371         else if (tid == IWL_AGG_ALL_TID)
 372                 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
 373                         rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 374 }
 375
 376 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 377 {
 378         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 379                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 380                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 381 }
 382
 383 /**
 384  * rs_collect_tx_data - Update the success/failure sliding window
 385  *
 386  * We keep a sliding window of the last 62 packets transmitted
 387  * at this rate.  window->data contains the bitmask of successful
 388  * packets.
 389  */
 390 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
 391                               int scale_index, s32 tpt, int retries,
 392                               int successes)
 393 {
 394         struct iwl_rate_scale_data *window = NULL;
 395         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 396         s32 fail_count;
 397
 398         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 399                 return -EINVAL;
 400
 401         /* Select data for current tx bit rate */
 402         window = &(windows[scale_index]);
 403
 404         /*
 405          * Keep track of only the latest 62 tx frame attempts in this rate's
 406          * history window; anything older isn't really relevant any more.
 407          * If we have filled up the sliding window, drop the oldest attempt;
 408          * if the oldest attempt (highest bit in bitmap) shows "success",
 409          * subtract "1" from the success counter (this is the main reason
 410          * we keep these bitmaps!).
 411          */
 412         while (retries > 0) {
 413                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 414
 415                         /* remove earliest */
 416                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 417
 418                         if (window->data & mask) {
 419                                 window->data &= ~mask;
 420                                 window->success_counter--;
 421                         }
 422                 }
 423
 424                 /* Increment frames-attempted counter */
 425                 window->counter++;
 426
 427                 /* Shift bitmap by one frame (throw away oldest history),
 428                  * OR in "1", and increment "success" if this
 429                  * frame was successful. */
 430                 window->data <<= 1;
 431                 if (successes > 0) {
 432                         window->success_counter++;
 433                         window->data |= 0x1;
 434                         successes--;
 435                 }
 436
 437                 retries--;
 438         }
 439
 440         /* Calculate current success ratio, avoid divide-by-0! */
 441         if (window->counter > 0)
 442                 window->success_ratio = 128 * (100 * window->success_counter)
 443                                         / window->counter;
 444         else
 445                 window->success_ratio = IWL_INVALID_VALUE;
 446
 447         fail_count = window->counter - window->success_counter;
 448
 449         /* Calculate average throughput, if we have enough history. */
 450         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 451             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 452                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 453         else
 454                 window->average_tpt = IWL_INVALID_VALUE;
 455
 456         /* Tag this window as having been updated */
 457         window->stamp = jiffies;
 458
 459         return 0;
 460 }
 461
 462 /*
 463  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 464  */
 465 /* FIXME:RS:remove this function and put the flags statically in the table */
 466 static u32 rate_n_flags_from_tbl(struct iwl_scale_tbl_info *tbl,
 467                                        int index, u8 use_green)
 468 {
 469         u32 rate_n_flags = 0;
 470
 471         if (is_legacy(tbl->lq_type)) {
 472                 rate_n_flags = iwl_rates[index].plcp;
 473                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 474                         rate_n_flags |= RATE_MCS_CCK_MSK;
 475
 476         } else if (is_Ht(tbl->lq_type)) {
 477                 if (index > IWL_LAST_OFDM_RATE) {
 478                         IWL_ERROR("invalid HT rate index %d\n", index);
 479                         index = IWL_LAST_OFDM_RATE;
 480                 }
 481                 rate_n_flags = RATE_MCS_HT_MSK;
 482
 483                 if (is_siso(tbl->lq_type))
 484                         rate_n_flags |= iwl_rates[index].plcp_siso;
 485                 else if (is_mimo2(tbl->lq_type))
 486                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 487                 else
 488                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 489         } else {
 490                 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
 491         }
 492
 493         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 494                                                      RATE_MCS_ANT_ABC_MSK);
 495
 496         if (is_Ht(tbl->lq_type)) {
 497                 if (tbl->is_fat) {
 498                         if (tbl->is_dup)
 499                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 500                         else
 501                                 rate_n_flags |= RATE_MCS_FAT_MSK;
 502                 }
 503                 if (tbl->is_SGI)
 504                         rate_n_flags |= RATE_MCS_SGI_MSK;
 505
 506                 if (use_green) {
 507                         rate_n_flags |= RATE_MCS_GF_MSK;
 508                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 509                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 510                                 IWL_ERROR("GF was set with SGI:SISO\n");
 511                         }
 512                 }
 513         }
 514         return rate_n_flags;
 515 }
 516
 517 /*
 518  * Interpret uCode API's rate_n_flags format,
 519  * fill "search" or "active" tx mode table.
 520  */
 521 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 522                                     enum ieee80211_band band,
 523                                     struct iwl_scale_tbl_info *tbl,
 524                                     int *rate_idx)
 525 {
 526         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 527         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 528         u8 mcs;
 529
 530         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 531
 532         if (*rate_idx  == IWL_RATE_INVALID) {
 533                 *rate_idx = -1;
 534                 return -EINVAL;
 535         }
 536         tbl->is_SGI = 0;        /* default legacy setup */
 537         tbl->is_fat = 0;
 538         tbl->is_dup = 0;
 539         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 540         tbl->lq_type = LQ_NONE;
 541
 542         /* legacy rate format */
 543         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 544                 if (num_of_ant == 1) {
 545                         if (band == IEEE80211_BAND_5GHZ)
 546                                 tbl->lq_type = LQ_A;
 547                         else
 548                                 tbl->lq_type = LQ_G;
 549                 }
 550         /* HT rate format */
 551         } else {
 552                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 553                         tbl->is_SGI = 1;
 554
 555                 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
 556                     (rate_n_flags & RATE_MCS_DUP_MSK))
 557                         tbl->is_fat = 1;
 558
 559                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 560                         tbl->is_dup = 1;
 561
 562                 mcs = rs_extract_rate(rate_n_flags);
 563
 564                 /* SISO */
 565                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 566                         if (num_of_ant == 1)
 567                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 568                 /* MIMO2 */
 569                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 570                         if (num_of_ant == 2)
 571                                 tbl->lq_type = LQ_MIMO2;
 572                 /* MIMO3 */
 573                 } else {
 574                         if (num_of_ant == 3)
 575                                 tbl->lq_type = LQ_MIMO3;
 576                 }
 577         }
 578         return 0;
 579 }
 580
 581 /* switch to another antenna/antennas and return 1 */
 582 /* if no other valid antenna found, return 0 */
 583 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 584                              struct iwl_scale_tbl_info *tbl)
 585 {
 586         u8 new_ant_type;
 587
 588         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 589                 return 0;
 590
 591         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 592                 return 0;
 593
 594         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 595
 596         while ((new_ant_type != tbl->ant_type) &&
 597                !rs_is_valid_ant(valid_ant, new_ant_type))
 598                 new_ant_type = ant_toggle_lookup[new_ant_type];
 599
 600         if (new_ant_type == tbl->ant_type)
 601                 return 0;
 602
 603         tbl->ant_type = new_ant_type;
 604         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 605         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 606         return 1;
 607 }
 608
 609 /* FIXME:RS: in 4965 we don't use greenfield at all */
 610 /* FIXME:RS: don't use greenfield for now in TX */
 611 #if 0
 612 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
 613 {
 614         return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
 615                 priv->current_ht_config.is_green_field &&
 616                 !priv->current_ht_config.non_GF_STA_present;
 617 }
 618 #endif
 619 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
 620 {
 621         return 0;
 622 }
 623
 624 /**
 625  * rs_get_supported_rates - get the available rates
 626  *
 627  * if management frame or broadcast frame only return
 628  * basic available rates.
 629  *
 630  */
 631 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 632                                   struct ieee80211_hdr *hdr,
 633                                   enum iwl_table_type rate_type)
 634 {
 635         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
 636             lq_sta->active_rate_basic)
 637                 return lq_sta->active_rate_basic;
 638
 639         if (is_legacy(rate_type)) {
 640                 return lq_sta->active_legacy_rate;
 641         } else {
 642                 if (is_siso(rate_type))
 643                         return lq_sta->active_siso_rate;
 644                 else if (is_mimo2(rate_type))
 645                         return lq_sta->active_mimo2_rate;
 646                 else
 647                         return lq_sta->active_mimo3_rate;
 648         }
 649 }
 650
 651 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 652                                 int rate_type)
 653 {
 654         u8 high = IWL_RATE_INVALID;
 655         u8 low = IWL_RATE_INVALID;
 656
 657         /* 802.11A or ht walks to the next literal adjacent rate in
 658          * the rate table */
 659         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 660                 int i;
 661                 u32 mask;
 662
 663                 /* Find the previous rate that is in the rate mask */
 664                 i = index - 1;
 665                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 666                         if (rate_mask & mask) {
 667                                 low = i;
 668                                 break;
 669                         }
 670                 }
 671
 672                 /* Find the next rate that is in the rate mask */
 673                 i = index + 1;
 674                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 675                         if (rate_mask & mask) {
 676                                 high = i;
 677                                 break;
 678                         }
 679                 }
 680
 681                 return (high << 8) | low;
 682         }
 683
 684         low = index;
 685         while (low != IWL_RATE_INVALID) {
 686                 low = iwl_rates[low].prev_rs;
 687                 if (low == IWL_RATE_INVALID)
 688                         break;
 689                 if (rate_mask & (1 << low))
 690                         break;
 691                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
 692         }
 693
 694         high = index;
 695         while (high != IWL_RATE_INVALID) {
 696                 high = iwl_rates[high].next_rs;
 697                 if (high == IWL_RATE_INVALID)
 698                         break;
 699                 if (rate_mask & (1 << high))
 700                         break;
 701                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
 702         }
 703
 704         return (high << 8) | low;
 705 }
 706
 707 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 708                              struct iwl_scale_tbl_info *tbl,
 709                              u8 scale_index, u8 ht_possible)
 710 {
 711         s32 low;
 712         u16 rate_mask;
 713         u16 high_low;
 714         u8 switch_to_legacy = 0;
 715         u8 is_green = lq_sta->is_green;
 716
 717         /* check if we need to switch from HT to legacy rates.
 718          * assumption is that mandatory rates (1Mbps or 6Mbps)
 719          * are always supported (spec demand) */
 720         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 721                 switch_to_legacy = 1;
 722                 scale_index = rs_ht_to_legacy[scale_index];
 723                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 724                         tbl->lq_type = LQ_A;
 725                 else
 726                         tbl->lq_type = LQ_G;
 727
 728                 if (num_of_ant(tbl->ant_type) > 1)
 729                         tbl->ant_type = ANT_A;/*FIXME:RS*/
 730
 731                 tbl->is_fat = 0;
 732                 tbl->is_SGI = 0;
 733         }
 734
 735         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 736
 737         /* Mask with station rate restriction */
 738         if (is_legacy(tbl->lq_type)) {
 739                 /* supp_rates has no CCK bits in A mode */
 740                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 741                         rate_mask  = (u16)(rate_mask &
 742                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 743                 else
 744                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 745         }
 746
 747         /* If we switched from HT to legacy, check current rate */
 748         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 749                 low = scale_index;
 750                 goto out;
 751         }
 752
 753         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 754                                         tbl->lq_type);
 755         low = high_low & 0xff;
 756
 757         if (low == IWL_RATE_INVALID)
 758                 low = scale_index;
 759
 760 out:
 761         return rate_n_flags_from_tbl(tbl, low, is_green);
 762 }
 763
 764 /*
 765  * mac80211 sends us Tx status
 766  */
 767 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 768                          struct ieee80211_sta *sta, void *priv_sta,
 769                          struct sk_buff *skb)
 770 {
 771         int status;
 772         u8 retries;
 773         int rs_index, index = 0;
 774         struct iwl_lq_sta *lq_sta = priv_sta;
 775         struct iwl_link_quality_cmd *table;
 776         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 777         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
 778         struct ieee80211_hw *hw = priv->hw;
 779         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 780         struct iwl_rate_scale_data *window = NULL;
 781         struct iwl_rate_scale_data *search_win = NULL;
 782         u32 tx_rate;
 783         struct iwl_scale_tbl_info tbl_type;
 784         struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
 785         u8 active_index = 0;
 786         s32 tpt = 0;
 787
 788         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
 789
 790         if (!ieee80211_is_data(hdr->frame_control) ||
 791             is_multicast_ether_addr(hdr->addr1))
 792                 return;
 793
 794         /* This packet was aggregated but doesn't carry rate scale info */
 795         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 796             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 797                 return;
 798
 799         retries = info->status.rates[0].count - 1;
 800
 801         if (retries > 15)
 802                 retries = 15;
 803
 804         if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
 805             !lq_sta->ibss_sta_added)
 806                 goto out;
 807
 808         table = &lq_sta->lq;
 809         active_index = lq_sta->active_tbl;
 810
 811         curr_tbl = &(lq_sta->lq_info[active_index]);
 812         search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
 813         window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
 814         search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
 815
 816         /*
 817          * Ignore this Tx frame response if its initial rate doesn't match
 818          * that of latest Link Quality command.  There may be stragglers
 819          * from a previous Link Quality command, but we're no longer interested
 820          * in those; they're either from the "active" mode while we're trying
 821          * to check "search" mode, or a prior "search" mode after we've moved
 822          * to a new "search" mode (which might become the new "active" mode).
 823          */
 824         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 825         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 826         if (priv->band == IEEE80211_BAND_5GHZ)
 827                 rs_index -= IWL_FIRST_OFDM_RATE;
 828
 829         if ((info->status.rates[0].idx < 0) ||
 830             (tbl_type.is_SGI != !!(info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)) ||
 831             (tbl_type.is_fat != !!(info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 832             (tbl_type.is_dup != !!(info->status.rates[0].flags & IEEE80211_TX_RC_DUP_DATA)) ||
 833             (tbl_type.ant_type != info->antenna_sel_tx) ||
 834             (!!(tx_rate & RATE_MCS_HT_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) ||
 835             (!!(tx_rate & RATE_MCS_GF_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 836             (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
 837              hw->wiphy->bands[info->band]->bitrates[info->status.rates[0].idx].bitrate)) {
 838                 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
 839                 goto out;
 840         }
 841
 842         /* Update frame history window with "failure" for each Tx retry. */
 843         while (retries) {
 844                 /* Look up the rate and other info used for each tx attempt.
 845                  * Each tx attempt steps one entry deeper in the rate table. */
 846                 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 847                 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
 848                                           &tbl_type, &rs_index);
 849
 850                 /* If type matches "search" table,
 851                  * add failure to "search" history */
 852                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 853                     (tbl_type.ant_type == search_tbl->ant_type) &&
 854                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 855                         if (search_tbl->expected_tpt)
 856                                 tpt = search_tbl->expected_tpt[rs_index];
 857                         else
 858                                 tpt = 0;
 859                         rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
 860
 861                 /* Else if type matches "current/active" table,
 862                  * add failure to "current/active" history */
 863                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 864                            (tbl_type.ant_type == curr_tbl->ant_type) &&
 865                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 866                         if (curr_tbl->expected_tpt)
 867                                 tpt = curr_tbl->expected_tpt[rs_index];
 868                         else
 869                                 tpt = 0;
 870                         rs_collect_tx_data(window, rs_index, tpt, 1, 0);
 871                 }
 872
 873                 /* If not searching for a new mode, increment failed counter
 874                  * ... this helps determine when to start searching again */
 875                 if (lq_sta->stay_in_tbl)
 876                         lq_sta->total_failed++;
 877                 --retries;
 878                 index++;
 879
 880         }
 881
 882         /*
 883          * Find (by rate) the history window to update with final Tx attempt;
 884          * if Tx was successful first try, use original rate,
 885          * else look up the rate that was, finally, successful.
 886          */
 887         tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 888         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 889
 890         /* Update frame history window with "success" if Tx got ACKed ... */
 891         status = !!(info->flags & IEEE80211_TX_STAT_ACK);
 892
 893         /* If type matches "search" table,
 894          * add final tx status to "search" history */
 895         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 896             (tbl_type.ant_type == search_tbl->ant_type) &&
 897             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 898                 if (search_tbl->expected_tpt)
 899                         tpt = search_tbl->expected_tpt[rs_index];
 900                 else
 901                         tpt = 0;
 902                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 903                         rs_collect_tx_data(search_win, rs_index, tpt,
 904                                            info->status.ampdu_ack_len,
 905                                            info->status.ampdu_ack_map);
 906                 else
 907                         rs_collect_tx_data(search_win, rs_index, tpt,
 908                                            1, status);
 909         /* Else if type matches "current/active" table,
 910          * add final tx status to "current/active" history */
 911         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 912                    (tbl_type.ant_type == curr_tbl->ant_type) &&
 913                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 914                 if (curr_tbl->expected_tpt)
 915                         tpt = curr_tbl->expected_tpt[rs_index];
 916                 else
 917                         tpt = 0;
 918                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 919                         rs_collect_tx_data(window, rs_index, tpt,
 920                                            info->status.ampdu_ack_len,
 921                                            info->status.ampdu_ack_map);
 922                 else
 923                         rs_collect_tx_data(window, rs_index, tpt,
 924                                            1, status);
 925         }
 926
 927         /* If not searching for new mode, increment success/failed counter
 928          * ... these help determine when to start searching again */
 929         if (lq_sta->stay_in_tbl) {
 930                 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
 931                         lq_sta->total_success += info->status.ampdu_ack_map;
 932                         lq_sta->total_failed +=
 933                              (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
 934                 } else {
 935                         if (status)
 936                                 lq_sta->total_success++;
 937                         else
 938                                 lq_sta->total_failed++;
 939                 }
 940         }
 941
 942         /* See if there's a better rate or modulation mode to try. */
 943         rs_rate_scale_perform(priv, hdr, sta, lq_sta);
 944 out:
 945         return;
 946 }
 947
 948 /*
 949  * Begin a period of staying with a selected modulation mode.
 950  * Set "stay_in_tbl" flag to prevent any mode switches.
 951  * Set frame tx success limits according to legacy vs. high-throughput,
 952  * and reset overall (spanning all rates) tx success history statistics.
 953  * These control how long we stay using same modulation mode before
 954  * searching for a new mode.
 955  */
 956 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
 957                                  struct iwl_lq_sta *lq_sta)
 958 {
 959         IWL_DEBUG_RATE("we are staying in the same table\n");
 960         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
 961         if (is_legacy) {
 962                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
 963                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
 964                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
 965         } else {
 966                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
 967                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
 968                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
 969         }
 970         lq_sta->table_count = 0;
 971         lq_sta->total_failed = 0;
 972         lq_sta->total_success = 0;
 973 }
 974
 975 /*
 976  * Find correct throughput table for given mode of modulation
 977  */
 978 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
 979                                       struct iwl_scale_tbl_info *tbl)
 980 {
 981         if (is_legacy(tbl->lq_type)) {
 982                 if (!is_a_band(tbl->lq_type))
 983                         tbl->expected_tpt = expected_tpt_G;
 984                 else
 985                         tbl->expected_tpt = expected_tpt_A;
 986         } else if (is_siso(tbl->lq_type)) {
 987                 if (tbl->is_fat && !lq_sta->is_dup)
 988                         if (tbl->is_SGI)
 989                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
 990                         else
 991                                 tbl->expected_tpt = expected_tpt_siso40MHz;
 992                 else if (tbl->is_SGI)
 993                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
 994                 else
 995                         tbl->expected_tpt = expected_tpt_siso20MHz;
 996
 997         } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
 998                 if (tbl->is_fat && !lq_sta->is_dup)
 999                         if (tbl->is_SGI)
1000                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1001                         else
1002                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
1003                 else if (tbl->is_SGI)
1004                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1005                 else
1006                         tbl->expected_tpt = expected_tpt_mimo20MHz;
1007         } else
1008                 tbl->expected_tpt = expected_tpt_G;
1009 }
1010
1011 /*
1012  * Find starting rate for new "search" high-throughput mode of modulation.
1013  * Goal is to find lowest expected rate (under perfect conditions) that is
1014  * above the current measured throughput of "active" mode, to give new mode
1015  * a fair chance to prove itself without too many challenges.
1016  *
1017  * This gets called when transitioning to more aggressive modulation
1018  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1019  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1020  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1021  * bit rate will typically need to increase, but not if performance was bad.
1022  */
1023 static s32 rs_get_best_rate(struct iwl_priv *priv,
1024                             struct iwl_lq_sta *lq_sta,
1025                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1026                             u16 rate_mask, s8 index)
1027 {
1028         /* "active" values */
1029         struct iwl_scale_tbl_info *active_tbl =
1030             &(lq_sta->lq_info[lq_sta->active_tbl]);
1031         s32 active_sr = active_tbl->win[index].success_ratio;
1032         s32 active_tpt = active_tbl->expected_tpt[index];
1033
1034         /* expected "search" throughput */
1035         s32 *tpt_tbl = tbl->expected_tpt;
1036
1037         s32 new_rate, high, low, start_hi;
1038         u16 high_low;
1039         s8 rate = index;
1040
1041         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1042
1043         for (; ;) {
1044                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1045                                                 tbl->lq_type);
1046
1047                 low = high_low & 0xff;
1048                 high = (high_low >> 8) & 0xff;
1049
1050                 /*
1051                  * Lower the "search" bit rate, to give new "search" mode
1052                  * approximately the same throughput as "active" if:
1053                  *
1054                  * 1) "Active" mode has been working modestly well (but not
1055                  *    great), and expected "search" throughput (under perfect
1056                  *    conditions) at candidate rate is above the actual
1057                  *    measured "active" throughput (but less than expected
1058                  *    "active" throughput under perfect conditions).
1059                  * OR
1060                  * 2) "Active" mode has been working perfectly or very well
1061                  *    and expected "search" throughput (under perfect
1062                  *    conditions) at candidate rate is above expected
1063                  *    "active" throughput (under perfect conditions).
1064                  */
1065                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1066                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1067                       (active_sr <= IWL_RATE_HIGH_TH) &&
1068                       (tpt_tbl[rate] <= active_tpt))) ||
1069                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1070                      (tpt_tbl[rate] > active_tpt))) {
1071
1072                         /* (2nd or later pass)
1073                          * If we've already tried to raise the rate, and are
1074                          * now trying to lower it, use the higher rate. */
1075                         if (start_hi != IWL_RATE_INVALID) {
1076                                 new_rate = start_hi;
1077                                 break;
1078                         }
1079
1080                         new_rate = rate;
1081
1082                         /* Loop again with lower rate */
1083                         if (low != IWL_RATE_INVALID)
1084                                 rate = low;
1085
1086                         /* Lower rate not available, use the original */
1087                         else
1088                                 break;
1089
1090                 /* Else try to raise the "search" rate to match "active" */
1091                 } else {
1092                         /* (2nd or later pass)
1093                          * If we've already tried to lower the rate, and are
1094                          * now trying to raise it, use the lower rate. */
1095                         if (new_rate != IWL_RATE_INVALID)
1096                                 break;
1097
1098                         /* Loop again with higher rate */
1099                         else if (high != IWL_RATE_INVALID) {
1100                                 start_hi = high;
1101                                 rate = high;
1102
1103                         /* Higher rate not available, use the original */
1104                         } else {
1105                                 new_rate = rate;
1106                                 break;
1107                         }
1108                 }
1109         }
1110
1111         return new_rate;
1112 }
1113
1114 /*
1115  * Set up search table for MIMO
1116  */
1117 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1118                              struct iwl_lq_sta *lq_sta,
1119                              struct ieee80211_conf *conf,
1120                              struct ieee80211_sta *sta,
1121                              struct iwl_scale_tbl_info *tbl, int index)
1122 {
1123         u16 rate_mask;
1124         s32 rate;
1125         s8 is_green = lq_sta->is_green;
1126
1127         if (!conf->ht.enabled || !sta->ht_cap.ht_supported)
1128                 return -1;
1129
1130         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1131                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1132                 return -1;
1133
1134         /* Need both Tx chains/antennas to support MIMO */
1135         if (priv->hw_params.tx_chains_num < 2)
1136                 return -1;
1137
1138         IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1139
1140         tbl->lq_type = LQ_MIMO2;
1141         tbl->is_dup = lq_sta->is_dup;
1142         tbl->action = 0;
1143         rate_mask = lq_sta->active_mimo2_rate;
1144
1145         if (priv->current_ht_config.supported_chan_width
1146                                         == IWL_CHANNEL_WIDTH_40MHZ)
1147                 tbl->is_fat = 1;
1148         else
1149                 tbl->is_fat = 0;
1150
1151         /* FIXME: - don't toggle SGI here
1152         if (tbl->is_fat) {
1153                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1154                         tbl->is_SGI = 1;
1155                 else
1156                         tbl->is_SGI = 0;
1157         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1158                 tbl->is_SGI = 1;
1159         else
1160                 tbl->is_SGI = 0;
1161         */
1162
1163         rs_set_expected_tpt_table(lq_sta, tbl);
1164
1165         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1166
1167         IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1168
1169         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1170                 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1171                                                 rate, rate_mask);
1172                 return -1;
1173         }
1174         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1175
1176         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1177                      tbl->current_rate, is_green);
1178         return 0;
1179 }
1180
1181 /*
1182  * Set up search table for SISO
1183  */
1184 static int rs_switch_to_siso(struct iwl_priv *priv,
1185                              struct iwl_lq_sta *lq_sta,
1186                              struct ieee80211_conf *conf,
1187                              struct ieee80211_sta *sta,
1188                              struct iwl_scale_tbl_info *tbl, int index)
1189 {
1190         u16 rate_mask;
1191         u8 is_green = lq_sta->is_green;
1192         s32 rate;
1193
1194         if (!conf->ht.enabled || !sta->ht_cap.ht_supported)
1195                 return -1;
1196
1197         IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1198
1199         tbl->is_dup = lq_sta->is_dup;
1200         tbl->lq_type = LQ_SISO;
1201         tbl->action = 0;
1202         rate_mask = lq_sta->active_siso_rate;
1203
1204         if (priv->current_ht_config.supported_chan_width
1205             == IWL_CHANNEL_WIDTH_40MHZ)
1206                 tbl->is_fat = 1;
1207         else
1208                 tbl->is_fat = 0;
1209
1210         /* FIXME: - don't toggle SGI here
1211         if (tbl->is_fat) {
1212                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1213                         tbl->is_SGI = 1;
1214                 else
1215                         tbl->is_SGI = 0;
1216         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1217                 tbl->is_SGI = 1;
1218         else
1219                 tbl->is_SGI = 0;
1220         */
1221
1222         if (is_green)
1223                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1224
1225         rs_set_expected_tpt_table(lq_sta, tbl);
1226         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1227
1228         IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1229         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1230                 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1231                              rate, rate_mask);
1232                 return -1;
1233         }
1234         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1235         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1236                      tbl->current_rate, is_green);
1237         return 0;
1238 }
1239
1240 /*
1241  * Try to switch to new modulation mode from legacy
1242  */
1243 static int rs_move_legacy_other(struct iwl_priv *priv,
1244                                 struct iwl_lq_sta *lq_sta,
1245                                 struct ieee80211_conf *conf,
1246                                 struct ieee80211_sta *sta,
1247                                 int index)
1248 {
1249         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1250         struct iwl_scale_tbl_info *search_tbl =
1251                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1252         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1253         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1254                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1255         u8 start_action = tbl->action;
1256         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1257         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1258         int ret = 0;
1259
1260         for (; ;) {
1261                 switch (tbl->action) {
1262                 case IWL_LEGACY_SWITCH_ANTENNA1:
1263                 case IWL_LEGACY_SWITCH_ANTENNA2:
1264                         IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1265
1266                         lq_sta->action_counter++;
1267
1268                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1269                                                         tx_chains_num <= 1) ||
1270                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1271                                                         tx_chains_num <= 2))
1272                                 break;
1273
1274                         /* Don't change antenna if success has been great */
1275                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1276                                 break;
1277
1278                         /* Set up search table to try other antenna */
1279                         memcpy(search_tbl, tbl, sz);
1280
1281                         if (rs_toggle_antenna(valid_tx_ant,
1282                                 &search_tbl->current_rate, search_tbl)) {
1283                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1284                                 goto out;
1285                         }
1286                         break;
1287                 case IWL_LEGACY_SWITCH_SISO:
1288                         IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1289
1290                         /* Set up search table to try SISO */
1291                         memcpy(search_tbl, tbl, sz);
1292                         search_tbl->is_SGI = 0;
1293                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1294                                                  search_tbl, index);
1295                         if (!ret) {
1296                                 lq_sta->action_counter = 0;
1297                                 goto out;
1298                         }
1299
1300                         break;
1301                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1302                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1303                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1304                         IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1305
1306                         /* Set up search table to try MIMO */
1307                         memcpy(search_tbl, tbl, sz);
1308                         search_tbl->is_SGI = 0;
1309
1310                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1311                                 search_tbl->ant_type = ANT_AB;
1312                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1313                                 search_tbl->ant_type = ANT_AC;
1314                         else
1315                                 search_tbl->ant_type = ANT_BC;
1316
1317                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1318                                 break;
1319
1320                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1321                                                  search_tbl, index);
1322                         if (!ret) {
1323                                 lq_sta->action_counter = 0;
1324                                 goto out;
1325                         }
1326                         break;
1327                 }
1328                 tbl->action++;
1329                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1330                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1331
1332                 if (tbl->action == start_action)
1333                         break;
1334
1335         }
1336         search_tbl->lq_type = LQ_NONE;
1337         return 0;
1338
1339 out:
1340         lq_sta->search_better_tbl = 1;
1341         tbl->action++;
1342         if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1343                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1344         return 0;
1345
1346 }
1347
1348 /*
1349  * Try to switch to new modulation mode from SISO
1350  */
1351 static int rs_move_siso_to_other(struct iwl_priv *priv,
1352                                  struct iwl_lq_sta *lq_sta,
1353                                  struct ieee80211_conf *conf,
1354                                  struct ieee80211_sta *sta, int index)
1355 {
1356         u8 is_green = lq_sta->is_green;
1357         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1358         struct iwl_scale_tbl_info *search_tbl =
1359                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1360         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1361         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1362                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1363         u8 start_action = tbl->action;
1364         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1365         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1366         int ret;
1367
1368         for (;;) {
1369                 lq_sta->action_counter++;
1370                 switch (tbl->action) {
1371                 case IWL_SISO_SWITCH_ANTENNA1:
1372                 case IWL_SISO_SWITCH_ANTENNA2:
1373                         IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1374
1375                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1376                                                         tx_chains_num <= 1) ||
1377                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1378                                                         tx_chains_num <= 2))
1379                                 break;
1380
1381                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1382                                 break;
1383
1384                         memcpy(search_tbl, tbl, sz);
1385                         if (rs_toggle_antenna(valid_tx_ant,
1386                                        &search_tbl->current_rate, search_tbl))
1387                                 goto out;
1388                         break;
1389                 case IWL_SISO_SWITCH_MIMO2_AB:
1390                 case IWL_SISO_SWITCH_MIMO2_AC:
1391                 case IWL_SISO_SWITCH_MIMO2_BC:
1392                         IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1393                         memcpy(search_tbl, tbl, sz);
1394                         search_tbl->is_SGI = 0;
1395
1396                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1397                                 search_tbl->ant_type = ANT_AB;
1398                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1399                                 search_tbl->ant_type = ANT_AC;
1400                         else
1401                                 search_tbl->ant_type = ANT_BC;
1402
1403                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1404                                 break;
1405
1406                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1407                                                  search_tbl, index);
1408                         if (!ret)
1409                                 goto out;
1410                         break;
1411                 case IWL_SISO_SWITCH_GI:
1412                         if (!tbl->is_fat &&
1413                                 !(priv->current_ht_config.sgf &
1414                                                 HT_SHORT_GI_20MHZ))
1415                                 break;
1416                         if (tbl->is_fat &&
1417                                 !(priv->current_ht_config.sgf &
1418                                                 HT_SHORT_GI_40MHZ))
1419                                 break;
1420
1421                         IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1422
1423                         memcpy(search_tbl, tbl, sz);
1424                         if (is_green) {
1425                                 if (!tbl->is_SGI)
1426                                         break;
1427                                 else
1428                                         IWL_ERROR("SGI was set in GF+SISO\n");
1429                         }
1430                         search_tbl->is_SGI = !tbl->is_SGI;
1431                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1432                         if (tbl->is_SGI) {
1433                                 s32 tpt = lq_sta->last_tpt / 100;
1434                                 if (tpt >= search_tbl->expected_tpt[index])
1435                                         break;
1436                         }
1437                         search_tbl->current_rate = rate_n_flags_from_tbl(
1438                                                 search_tbl, index, is_green);
1439                         goto out;
1440                 }
1441                 tbl->action++;
1442                 if (tbl->action > IWL_SISO_SWITCH_GI)
1443                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1444
1445                 if (tbl->action == start_action)
1446                         break;
1447         }
1448         search_tbl->lq_type = LQ_NONE;
1449         return 0;
1450
1451  out:
1452         lq_sta->search_better_tbl = 1;
1453         tbl->action++;
1454         if (tbl->action > IWL_SISO_SWITCH_GI)
1455                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1456         return 0;
1457 }
1458
1459 /*
1460  * Try to switch to new modulation mode from MIMO
1461  */
1462 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1463                                  struct iwl_lq_sta *lq_sta,
1464                                  struct ieee80211_conf *conf,
1465                                  struct ieee80211_sta *sta, int index)
1466 {
1467         s8 is_green = lq_sta->is_green;
1468         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1469         struct iwl_scale_tbl_info *search_tbl =
1470                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1471         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1472         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1473                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1474         u8 start_action = tbl->action;
1475         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1476         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1477         int ret;
1478
1479         for (;;) {
1480                 lq_sta->action_counter++;
1481                 switch (tbl->action) {
1482                 case IWL_MIMO2_SWITCH_ANTENNA1:
1483                 case IWL_MIMO2_SWITCH_ANTENNA2:
1484                         IWL_DEBUG_RATE("LQ: MIMO toggle Antennas\n");
1485
1486                         if (tx_chains_num <= 2)
1487                                 break;
1488
1489                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1490                                 break;
1491
1492                         memcpy(search_tbl, tbl, sz);
1493                         if (rs_toggle_antenna(valid_tx_ant,
1494                                        &search_tbl->current_rate, search_tbl))
1495                                 goto out;
1496                         break;
1497                 case IWL_MIMO2_SWITCH_SISO_A:
1498                 case IWL_MIMO2_SWITCH_SISO_B:
1499                 case IWL_MIMO2_SWITCH_SISO_C:
1500                         IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1501
1502                         /* Set up new search table for SISO */
1503                         memcpy(search_tbl, tbl, sz);
1504
1505                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1506                                 search_tbl->ant_type = ANT_A;
1507                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1508                                 search_tbl->ant_type = ANT_B;
1509                         else
1510                                 search_tbl->ant_type = ANT_C;
1511
1512                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1513                                 break;
1514
1515                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1516                                                  search_tbl, index);
1517                         if (!ret)
1518                                 goto out;
1519
1520                         break;
1521
1522                 case IWL_MIMO2_SWITCH_GI:
1523                         if (!tbl->is_fat &&
1524                                 !(priv->current_ht_config.sgf &
1525                                                 HT_SHORT_GI_20MHZ))
1526                                 break;
1527                         if (tbl->is_fat &&
1528                                 !(priv->current_ht_config.sgf &
1529                                                 HT_SHORT_GI_40MHZ))
1530                                 break;
1531
1532                         IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1533
1534                         /* Set up new search table for MIMO */
1535                         memcpy(search_tbl, tbl, sz);
1536                         search_tbl->is_SGI = !tbl->is_SGI;
1537                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1538                         /*
1539                          * If active table already uses the fastest possible
1540                          * modulation (dual stream with short guard interval),
1541                          * and it's working well, there's no need to look
1542                          * for a better type of modulation!
1543                          */
1544                         if (tbl->is_SGI) {
1545                                 s32 tpt = lq_sta->last_tpt / 100;
1546                                 if (tpt >= search_tbl->expected_tpt[index])
1547                                         break;
1548                         }
1549                         search_tbl->current_rate = rate_n_flags_from_tbl(
1550                                                 search_tbl, index, is_green);
1551                         goto out;
1552
1553                 }
1554                 tbl->action++;
1555                 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1556                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1557
1558                 if (tbl->action == start_action)
1559                         break;
1560         }
1561         search_tbl->lq_type = LQ_NONE;
1562         return 0;
1563  out:
1564         lq_sta->search_better_tbl = 1;
1565         tbl->action++;
1566         if (tbl->action > IWL_MIMO2_SWITCH_GI)
1567                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1568         return 0;
1569
1570 }
1571
1572 /*
1573  * Check whether we should continue using same modulation mode, or
1574  * begin search for a new mode, based on:
1575  * 1) # tx successes or failures while using this mode
1576  * 2) # times calling this function
1577  * 3) elapsed time in this mode (not used, for now)
1578  */
1579 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1580 {
1581         struct iwl_scale_tbl_info *tbl;
1582         int i;
1583         int active_tbl;
1584         int flush_interval_passed = 0;
1585         struct iwl_priv *priv;
1586
1587         priv = lq_sta->drv;
1588         active_tbl = lq_sta->active_tbl;
1589
1590         tbl = &(lq_sta->lq_info[active_tbl]);
1591
1592         /* If we've been disallowing search, see if we should now allow it */
1593         if (lq_sta->stay_in_tbl) {
1594
1595                 /* Elapsed time using current modulation mode */
1596                 if (lq_sta->flush_timer)
1597                         flush_interval_passed =
1598                             time_after(jiffies,
1599                                        (unsigned long)(lq_sta->flush_timer +
1600                                         IWL_RATE_SCALE_FLUSH_INTVL));
1601
1602                 /*
1603                  * Check if we should allow search for new modulation mode.
1604                  * If many frames have failed or succeeded, or we've used
1605                  * this same modulation for a long time, allow search, and
1606                  * reset history stats that keep track of whether we should
1607                  * allow a new search.  Also (below) reset all bitmaps and
1608                  * stats in active history.
1609                  */
1610                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1611                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1612                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1613                      && (flush_interval_passed))) {
1614                         IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1615                                      lq_sta->total_failed,
1616                                      lq_sta->total_success,
1617                                      flush_interval_passed);
1618
1619                         /* Allow search for new mode */
1620                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1621                         lq_sta->total_failed = 0;
1622                         lq_sta->total_success = 0;
1623                         lq_sta->flush_timer = 0;
1624
1625                 /*
1626                  * Else if we've used this modulation mode enough repetitions
1627                  * (regardless of elapsed time or success/failure), reset
1628                  * history bitmaps and rate-specific stats for all rates in
1629                  * active table.
1630                  */
1631                 } else {
1632                         lq_sta->table_count++;
1633                         if (lq_sta->table_count >=
1634                             lq_sta->table_count_limit) {
1635                                 lq_sta->table_count = 0;
1636
1637                                 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1638                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1639                                         rs_rate_scale_clear_window(
1640                                                 &(tbl->win[i]));
1641                         }
1642                 }
1643
1644                 /* If transitioning to allow "search", reset all history
1645                  * bitmaps and stats in active table (this will become the new
1646                  * "search" table). */
1647                 if (!lq_sta->stay_in_tbl) {
1648                         for (i = 0; i < IWL_RATE_COUNT; i++)
1649                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1650                 }
1651         }
1652 }
1653
1654 /*
1655  * Do rate scaling and search for new modulation mode.
1656  */
1657 static void rs_rate_scale_perform(struct iwl_priv *priv,
1658                                   struct ieee80211_hdr *hdr,
1659                                   struct ieee80211_sta *sta,
1660                                   struct iwl_lq_sta *lq_sta)
1661 {
1662         struct ieee80211_hw *hw = priv->hw;
1663         struct ieee80211_conf *conf = &hw->conf;
1664         int low = IWL_RATE_INVALID;
1665         int high = IWL_RATE_INVALID;
1666         int index;
1667         int i;
1668         struct iwl_rate_scale_data *window = NULL;
1669         int current_tpt = IWL_INVALID_VALUE;
1670         int low_tpt = IWL_INVALID_VALUE;
1671         int high_tpt = IWL_INVALID_VALUE;
1672         u32 fail_count;
1673         s8 scale_action = 0;
1674         u16 rate_mask;
1675         u8 update_lq = 0;
1676         struct iwl_scale_tbl_info *tbl, *tbl1;
1677         u16 rate_scale_index_msk = 0;
1678         u32 rate;
1679         u8 is_green = 0;
1680         u8 active_tbl = 0;
1681         u8 done_search = 0;
1682         u16 high_low;
1683         s32 sr;
1684         u8 tid = MAX_TID_COUNT;
1685
1686         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1687
1688         /* Send management frames and broadcast/multicast data using
1689          * lowest rate. */
1690         /* TODO: this could probably be improved.. */
1691         if (!ieee80211_is_data(hdr->frame_control) ||
1692             is_multicast_ether_addr(hdr->addr1))
1693                 return;
1694
1695         if (!sta || !lq_sta)
1696                 return;
1697
1698         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1699
1700         tid = rs_tl_add_packet(lq_sta, hdr);
1701
1702         /*
1703          * Select rate-scale / modulation-mode table to work with in
1704          * the rest of this function:  "search" if searching for better
1705          * modulation mode, or "active" if doing rate scaling within a mode.
1706          */
1707         if (!lq_sta->search_better_tbl)
1708                 active_tbl = lq_sta->active_tbl;
1709         else
1710                 active_tbl = 1 - lq_sta->active_tbl;
1711
1712         tbl = &(lq_sta->lq_info[active_tbl]);
1713         is_green = lq_sta->is_green;
1714
1715         /* current tx rate */
1716         index = lq_sta->last_txrate_idx;
1717
1718         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1719                        tbl->lq_type);
1720
1721         /* rates available for this association, and for modulation mode */
1722         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1723
1724         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1725
1726         /* mask with station rate restriction */
1727         if (is_legacy(tbl->lq_type)) {
1728                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1729                         /* supp_rates has no CCK bits in A mode */
1730                         rate_scale_index_msk = (u16) (rate_mask &
1731                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1732                 else
1733                         rate_scale_index_msk = (u16) (rate_mask &
1734                                                       lq_sta->supp_rates);
1735
1736         } else
1737                 rate_scale_index_msk = rate_mask;
1738
1739         if (!rate_scale_index_msk)
1740                 rate_scale_index_msk = rate_mask;
1741
1742         if (!((1 << index) & rate_scale_index_msk)) {
1743                 IWL_ERROR("Current Rate is not valid\n");
1744                 return;
1745         }
1746
1747         /* Get expected throughput table and history window for current rate */
1748         if (!tbl->expected_tpt) {
1749                 IWL_ERROR("tbl->expected_tpt is NULL\n");
1750                 return;
1751         }
1752
1753         window = &(tbl->win[index]);
1754
1755         /*
1756          * If there is not enough history to calculate actual average
1757          * throughput, keep analyzing results of more tx frames, without
1758          * changing rate or mode (bypass most of the rest of this function).
1759          * Set up new rate table in uCode only if old rate is not supported
1760          * in current association (use new rate found above).
1761          */
1762         fail_count = window->counter - window->success_counter;
1763         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1764                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1765                 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1766                                "for index %d\n",
1767                                window->success_counter, window->counter, index);
1768
1769                 /* Can't calculate this yet; not enough history */
1770                 window->average_tpt = IWL_INVALID_VALUE;
1771
1772                 /* Should we stay with this modulation mode,
1773                  * or search for a new one? */
1774                 rs_stay_in_table(lq_sta);
1775
1776                 goto out;
1777         }
1778
1779         /* Else we have enough samples; calculate estimate of
1780          * actual average throughput */
1781
1782         BUG_ON(window->average_tpt != ((window->success_ratio *
1783                         tbl->expected_tpt[index] + 64) / 128));
1784
1785         /* If we are searching for better modulation mode, check success. */
1786         if (lq_sta->search_better_tbl) {
1787
1788                 /* If good success, continue using the "search" mode;
1789                  * no need to send new link quality command, since we're
1790                  * continuing to use the setup that we've been trying. */
1791                 if (window->average_tpt > lq_sta->last_tpt) {
1792
1793                         IWL_DEBUG_RATE("LQ: SWITCHING TO NEW TABLE "
1794                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1795                                         window->success_ratio,
1796                                         window->average_tpt,
1797                                         lq_sta->last_tpt);
1798
1799                         if (!is_legacy(tbl->lq_type))
1800                                 lq_sta->enable_counter = 1;
1801
1802                         /* Swap tables; "search" becomes "active" */
1803                         lq_sta->active_tbl = active_tbl;
1804                         current_tpt = window->average_tpt;
1805
1806                 /* Else poor success; go back to mode in "active" table */
1807                 } else {
1808
1809                         IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1810                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1811                                         window->success_ratio,
1812                                         window->average_tpt,
1813                                         lq_sta->last_tpt);
1814
1815                         /* Nullify "search" table */
1816                         tbl->lq_type = LQ_NONE;
1817
1818                         /* Revert to "active" table */
1819                         active_tbl = lq_sta->active_tbl;
1820                         tbl = &(lq_sta->lq_info[active_tbl]);
1821
1822                         /* Revert to "active" rate and throughput info */
1823                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1824                         current_tpt = lq_sta->last_tpt;
1825
1826                         /* Need to set up a new rate table in uCode */
1827                         update_lq = 1;
1828                 }
1829
1830                 /* Either way, we've made a decision; modulation mode
1831                  * search is done, allow rate adjustment next time. */
1832                 lq_sta->search_better_tbl = 0;
1833                 done_search = 1;        /* Don't switch modes below! */
1834                 goto lq_update;
1835         }
1836
1837         /* (Else) not in search of better modulation mode, try for better
1838          * starting rate, while staying in this mode. */
1839         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1840                                         tbl->lq_type);
1841         low = high_low & 0xff;
1842         high = (high_low >> 8) & 0xff;
1843
1844         sr = window->success_ratio;
1845
1846         /* Collect measured throughputs for current and adjacent rates */
1847         current_tpt = window->average_tpt;
1848         if (low != IWL_RATE_INVALID)
1849                 low_tpt = tbl->win[low].average_tpt;
1850         if (high != IWL_RATE_INVALID)
1851                 high_tpt = tbl->win[high].average_tpt;
1852
1853         scale_action = 0;
1854
1855         /* Too many failures, decrease rate */
1856         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1857                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1858                 scale_action = -1;
1859
1860         /* No throughput measured yet for adjacent rates; try increase. */
1861         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1862                    (high_tpt == IWL_INVALID_VALUE)) {
1863
1864                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1865                         scale_action = 1;
1866                 else if (low != IWL_RATE_INVALID)
1867                         scale_action = -1;
1868         }
1869
1870         /* Both adjacent throughputs are measured, but neither one has better
1871          * throughput; we're using the best rate, don't change it! */
1872         else if ((low_tpt != IWL_INVALID_VALUE) &&
1873                  (high_tpt != IWL_INVALID_VALUE) &&
1874                  (low_tpt < current_tpt) &&
1875                  (high_tpt < current_tpt))
1876                 scale_action = 0;
1877
1878         /* At least one adjacent rate's throughput is measured,
1879          * and may have better performance. */
1880         else {
1881                 /* Higher adjacent rate's throughput is measured */
1882                 if (high_tpt != IWL_INVALID_VALUE) {
1883                         /* Higher rate has better throughput */
1884                         if (high_tpt > current_tpt &&
1885                                         sr >= IWL_RATE_INCREASE_TH) {
1886                                 scale_action = 1;
1887                         } else {
1888                                 IWL_DEBUG_RATE
1889                                     ("decrease rate because of high tpt\n");
1890                                 scale_action = -1;
1891                         }
1892
1893                 /* Lower adjacent rate's throughput is measured */
1894                 } else if (low_tpt != IWL_INVALID_VALUE) {
1895                         /* Lower rate has better throughput */
1896                         if (low_tpt > current_tpt) {
1897                                 IWL_DEBUG_RATE
1898                                     ("decrease rate because of low tpt\n");
1899                                 scale_action = -1;
1900                         } else if (sr >= IWL_RATE_INCREASE_TH) {
1901                                 scale_action = 1;
1902                         }
1903                 }
1904         }
1905
1906         /* Sanity check; asked for decrease, but success rate or throughput
1907          * has been good at old rate.  Don't change it. */
1908         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1909                     ((sr > IWL_RATE_HIGH_TH) ||
1910                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1911                 scale_action = 0;
1912
1913         switch (scale_action) {
1914         case -1:
1915                 /* Decrease starting rate, update uCode's rate table */
1916                 if (low != IWL_RATE_INVALID) {
1917                         update_lq = 1;
1918                         index = low;
1919                 }
1920                 break;
1921         case 1:
1922                 /* Increase starting rate, update uCode's rate table */
1923                 if (high != IWL_RATE_INVALID) {
1924                         update_lq = 1;
1925                         index = high;
1926                 }
1927
1928                 break;
1929         case 0:
1930                 /* No change */
1931         default:
1932                 break;
1933         }
1934
1935         IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1936                     "high %d type %d\n",
1937                      index, scale_action, low, high, tbl->lq_type);
1938
1939 lq_update:
1940         /* Replace uCode's rate table for the destination station. */
1941         if (update_lq) {
1942                 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1943                 rs_fill_link_cmd(priv, lq_sta, rate);
1944                 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1945         }
1946
1947         /* Should we stay with this modulation mode, or search for a new one? */
1948         rs_stay_in_table(lq_sta);
1949
1950         /*
1951          * Search for new modulation mode if we're:
1952          * 1)  Not changing rates right now
1953          * 2)  Not just finishing up a search
1954          * 3)  Allowing a new search
1955          */
1956         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1957                 /* Save current throughput to compare with "search" throughput*/
1958                 lq_sta->last_tpt = current_tpt;
1959
1960                 /* Select a new "search" modulation mode to try.
1961                  * If one is found, set up the new "search" table. */
1962                 if (is_legacy(tbl->lq_type))
1963                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1964                 else if (is_siso(tbl->lq_type))
1965                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1966                 else
1967                         rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1968
1969                 /* If new "search" mode was selected, set up in uCode table */
1970                 if (lq_sta->search_better_tbl) {
1971                         /* Access the "search" table, clear its history. */
1972                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1973                         for (i = 0; i < IWL_RATE_COUNT; i++)
1974                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1975
1976                         /* Use new "search" start rate */
1977                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1978
1979                         IWL_DEBUG_RATE("Switch current  mcs: %X index: %d\n",
1980                                      tbl->current_rate, index);
1981                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
1982                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1983                 }
1984
1985                 /* If the "active" (non-search) mode was legacy,
1986                  * and we've tried switching antennas,
1987                  * but we haven't been able to try HT modes (not available),
1988                  * stay with best antenna legacy modulation for a while
1989                  * before next round of mode comparisons. */
1990                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
1991                 if (is_legacy(tbl1->lq_type) && !conf->ht.enabled &&
1992                     lq_sta->action_counter >= 1) {
1993                         lq_sta->action_counter = 0;
1994                         IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
1995                         rs_set_stay_in_table(priv, 1, lq_sta);
1996                 }
1997
1998                 /* If we're in an HT mode, and all 3 mode switch actions
1999                  * have been tried and compared, stay in this best modulation
2000                  * mode for a while before next round of mode comparisons. */
2001                 if (lq_sta->enable_counter &&
2002                     (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2003                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2004                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2005                             (tid != MAX_TID_COUNT)) {
2006                                 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
2007                                 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2008                         }
2009                         lq_sta->action_counter = 0;
2010                         rs_set_stay_in_table(priv, 0, lq_sta);
2011                 }
2012
2013         /*
2014          * Else, don't search for a new modulation mode.
2015          * Put new timestamp in stay-in-modulation-mode flush timer if:
2016          * 1)  Not changing rates right now
2017          * 2)  Not just finishing up a search
2018          * 3)  flush timer is empty
2019          */
2020         } else {
2021                 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2022                         lq_sta->flush_timer = jiffies;
2023         }
2024
2025 out:
2026         tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2027         i = index;
2028         lq_sta->last_txrate_idx = i;
2029
2030         return;
2031 }
2032
2033
2034 static void rs_initialize_lq(struct iwl_priv *priv,
2035                              struct ieee80211_conf *conf,
2036                              struct ieee80211_sta *sta,
2037                              struct iwl_lq_sta *lq_sta)
2038 {
2039         struct iwl_scale_tbl_info *tbl;
2040         int rate_idx;
2041         int i;
2042         u32 rate;
2043         u8 use_green = rs_use_green(priv, conf);
2044         u8 active_tbl = 0;
2045         u8 valid_tx_ant;
2046
2047         if (!sta || !lq_sta)
2048                 goto out;
2049
2050         i = lq_sta->last_txrate_idx;
2051
2052         if ((lq_sta->lq.sta_id == 0xff) &&
2053             (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2054                 goto out;
2055
2056         valid_tx_ant = priv->hw_params.valid_tx_ant;
2057
2058         if (!lq_sta->search_better_tbl)
2059                 active_tbl = lq_sta->active_tbl;
2060         else
2061                 active_tbl = 1 - lq_sta->active_tbl;
2062
2063         tbl = &(lq_sta->lq_info[active_tbl]);
2064
2065         if ((i < 0) || (i >= IWL_RATE_COUNT))
2066                 i = 0;
2067
2068         rate = iwl_rates[i].plcp;
2069         tbl->ant_type = first_antenna(valid_tx_ant);
2070         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2071
2072         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2073                 rate |= RATE_MCS_CCK_MSK;
2074
2075         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2076         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2077             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2078
2079         rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2080         tbl->current_rate = rate;
2081         rs_set_expected_tpt_table(lq_sta, tbl);
2082         rs_fill_link_cmd(NULL, lq_sta, rate);
2083         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2084  out:
2085         return;
2086 }
2087
2088 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2089                         struct ieee80211_tx_rate_control *txrc)
2090 {
2091
2092         struct sk_buff *skb = txrc->skb;
2093         struct ieee80211_supported_band *sband = txrc->sband;
2094         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2095         struct ieee80211_conf *conf = &priv->hw->conf;
2096         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2097         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2098         struct iwl_lq_sta *lq_sta = priv_sta;
2099         int rate_idx;
2100
2101         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2102
2103         /* Send management frames and broadcast/multicast data using lowest
2104          * rate. */
2105         if (!ieee80211_is_data(hdr->frame_control) ||
2106             is_multicast_ether_addr(hdr->addr1) || !sta || !lq_sta) {
2107                 info->control.rates[0].idx = rate_lowest_index(sband, sta);
2108                 return;
2109         }
2110
2111         rate_idx  = lq_sta->last_txrate_idx;
2112
2113         if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2114             !lq_sta->ibss_sta_added) {
2115                 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2116
2117                 if (sta_id == IWL_INVALID_STATION) {
2118                         IWL_DEBUG_RATE("LQ: ADD station %pM\n",
2119                                        hdr->addr1);
2120                         sta_id = iwl_add_station_flags(priv, hdr->addr1,
2121                                                         0, CMD_ASYNC, NULL);
2122                 }
2123                 if ((sta_id != IWL_INVALID_STATION)) {
2124                         lq_sta->lq.sta_id = sta_id;
2125                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2126                         lq_sta->ibss_sta_added = 1;
2127                         rs_initialize_lq(priv, conf, sta, lq_sta);
2128                 }
2129         }
2130
2131         if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT)
2132                 rate_idx = rate_lowest_index(sband, sta);
2133         else if (sband->band == IEEE80211_BAND_5GHZ)
2134                 rate_idx -= IWL_FIRST_OFDM_RATE;
2135
2136         info->control.rates[0].idx = rate_idx;
2137 }
2138
2139 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2140                           gfp_t gfp)
2141 {
2142         struct iwl_lq_sta *lq_sta;
2143         struct iwl_priv *priv;
2144         int i, j;
2145
2146         priv = (struct iwl_priv *)priv_rate;
2147         IWL_DEBUG_RATE("create station rate scale window\n");
2148
2149         lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2150
2151         if (lq_sta == NULL)
2152                 return NULL;
2153         lq_sta->lq.sta_id = 0xff;
2154
2155
2156         for (j = 0; j < LQ_SIZE; j++)
2157                 for (i = 0; i < IWL_RATE_COUNT; i++)
2158                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2159
2160         return lq_sta;
2161 }
2162
2163 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2164                          struct ieee80211_sta *sta, void *priv_sta)
2165 {
2166         int i, j;
2167         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2168         struct ieee80211_conf *conf = &priv->hw->conf;
2169         struct iwl_lq_sta *lq_sta = priv_sta;
2170
2171         lq_sta->flush_timer = 0;
2172         lq_sta->supp_rates = sta->supp_rates[sband->band];
2173         for (j = 0; j < LQ_SIZE; j++)
2174                 for (i = 0; i < IWL_RATE_COUNT; i++)
2175                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2176
2177         IWL_DEBUG_RATE("LQ: *** rate scale station global init ***\n");
2178         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2179          * the lowest or the highest rate.. Could consider using RSSI from
2180          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2181          * after assoc.. */
2182
2183         lq_sta->ibss_sta_added = 0;
2184         if (priv->iw_mode == NL80211_IFTYPE_AP) {
2185                 u8 sta_id = iwl_find_station(priv, sta->addr);
2186
2187                 /* for IBSS the call are from tasklet */
2188                 IWL_DEBUG_RATE("LQ: ADD station %pM\n", sta->addr);
2189
2190                 if (sta_id == IWL_INVALID_STATION) {
2191                         IWL_DEBUG_RATE("LQ: ADD station %pM\n", sta->addr);
2192                         sta_id = iwl_add_station_flags(priv, sta->addr,
2193                                                         0, CMD_ASYNC, NULL);
2194                 }
2195                 if ((sta_id != IWL_INVALID_STATION)) {
2196                         lq_sta->lq.sta_id = sta_id;
2197                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2198                 }
2199                 /* FIXME: this is w/a remove it later */
2200                 priv->assoc_station_added = 1;
2201         }
2202
2203         /* Find highest tx rate supported by hardware and destination station */
2204         lq_sta->last_txrate_idx = 3;
2205         for (i = 0; i < sband->n_bitrates; i++)
2206                 if (sta->supp_rates[sband->band] & BIT(i))
2207                         lq_sta->last_txrate_idx = i;
2208
2209         /* For MODE_IEEE80211A, skip over cck rates in global rate table */
2210         if (sband->band == IEEE80211_BAND_5GHZ)
2211                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2212
2213         lq_sta->is_dup = 0;
2214         lq_sta->is_green = rs_use_green(priv, conf);
2215         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2216         lq_sta->active_rate_basic = priv->active_rate_basic;
2217         lq_sta->band = priv->band;
2218         /*
2219          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2220          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2221          */
2222         lq_sta->active_siso_rate = sta->ht_cap.mcs.rx_mask[0] << 1;
2223         lq_sta->active_siso_rate |= sta->ht_cap.mcs.rx_mask[0] & 0x1;
2224         lq_sta->active_siso_rate &= ~((u16)0x2);
2225         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2226
2227         /* Same here */
2228         lq_sta->active_mimo2_rate = sta->ht_cap.mcs.rx_mask[1] << 1;
2229         lq_sta->active_mimo2_rate |= sta->ht_cap.mcs.rx_mask[1] & 0x1;
2230         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2231         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2232
2233         lq_sta->active_mimo3_rate = sta->ht_cap.mcs.rx_mask[2] << 1;
2234         lq_sta->active_mimo3_rate |= sta->ht_cap.mcs.rx_mask[2] & 0x1;
2235         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2236         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2237
2238         IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2239                      lq_sta->active_siso_rate,
2240                      lq_sta->active_mimo2_rate,
2241                      lq_sta->active_mimo3_rate);
2242
2243         /* These values will be overridden later */
2244         lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2245         lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2246
2247         /* as default allow aggregation for all tids */
2248         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2249         lq_sta->drv = priv;
2250
2251         rs_initialize_lq(priv, conf, sta, lq_sta);
2252 }
2253
2254 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2255                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2256 {
2257         struct iwl_scale_tbl_info tbl_type;
2258         int index = 0;
2259         int rate_idx;
2260         int repeat_rate = 0;
2261         u8 ant_toggle_cnt = 0;
2262         u8 use_ht_possible = 1;
2263         u8 valid_tx_ant = 0;
2264         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2265
2266         /* Override starting rate (index 0) if needed for debug purposes */
2267         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2268
2269         /* Interpret new_rate (rate_n_flags) */
2270         memset(&tbl_type, 0, sizeof(tbl_type));
2271         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2272                                   &tbl_type, &rate_idx);
2273
2274         /* How many times should we repeat the initial rate? */
2275         if (is_legacy(tbl_type.lq_type)) {
2276                 ant_toggle_cnt = 1;
2277                 repeat_rate = IWL_NUMBER_TRY;
2278         } else {
2279                 repeat_rate = IWL_HT_NUMBER_TRY;
2280         }
2281
2282         lq_cmd->general_params.mimo_delimiter =
2283                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2284
2285         /* Fill 1st table entry (index 0) */
2286         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2287
2288         if (num_of_ant(tbl_type.ant_type) == 1) {
2289                 lq_cmd->general_params.single_stream_ant_msk =
2290                                                 tbl_type.ant_type;
2291         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2292                 lq_cmd->general_params.dual_stream_ant_msk =
2293                                                 tbl_type.ant_type;
2294         } /* otherwise we don't modify the existing value */
2295
2296         index++;
2297         repeat_rate--;
2298
2299         if (priv)
2300                 valid_tx_ant = priv->hw_params.valid_tx_ant;
2301
2302         /* Fill rest of rate table */
2303         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2304                 /* Repeat initial/next rate.
2305                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2306                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2307                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2308                         if (is_legacy(tbl_type.lq_type)) {
2309                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2310                                         ant_toggle_cnt++;
2311                                 else if (priv &&
2312                                          rs_toggle_antenna(valid_tx_ant,
2313                                                         &new_rate, &tbl_type))
2314                                         ant_toggle_cnt = 1;
2315 }
2316
2317                         /* Override next rate if needed for debug purposes */
2318                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2319
2320                         /* Fill next table entry */
2321                         lq_cmd->rs_table[index].rate_n_flags =
2322                                         cpu_to_le32(new_rate);
2323                         repeat_rate--;
2324                         index++;
2325                 }
2326
2327                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2328                                                 &rate_idx);
2329
2330                 /* Indicate to uCode which entries might be MIMO.
2331                  * If initial rate was MIMO, this will finally end up
2332                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2333                 if (is_mimo(tbl_type.lq_type))
2334                         lq_cmd->general_params.mimo_delimiter = index;
2335
2336                 /* Get next rate */
2337                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2338                                              use_ht_possible);
2339
2340                 /* How many times should we repeat the next rate? */
2341                 if (is_legacy(tbl_type.lq_type)) {
2342                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2343                                 ant_toggle_cnt++;
2344                         else if (priv &&
2345                                  rs_toggle_antenna(valid_tx_ant,
2346                                                    &new_rate, &tbl_type))
2347                                 ant_toggle_cnt = 1;
2348
2349                         repeat_rate = IWL_NUMBER_TRY;
2350                 } else {
2351                         repeat_rate = IWL_HT_NUMBER_TRY;
2352                 }
2353
2354                 /* Don't allow HT rates after next pass.
2355                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2356                 use_ht_possible = 0;
2357
2358                 /* Override next rate if needed for debug purposes */
2359                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2360
2361                 /* Fill next table entry */
2362                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2363
2364                 index++;
2365                 repeat_rate--;
2366         }
2367
2368         lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2369         lq_cmd->agg_params.agg_dis_start_th = 3;
2370         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2371 }
2372
2373 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2374 {
2375         return hw->priv;
2376 }
2377 /* rate scale requires free function to be implemented */
2378 static void rs_free(void *priv_rate)
2379 {
2380         return;
2381 }
2382
2383 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2384                         void *priv_sta)
2385 {
2386         struct iwl_lq_sta *lq_sta = priv_sta;
2387         struct iwl_priv *priv __maybe_unused = priv_r;
2388
2389         IWL_DEBUG_RATE("enter\n");
2390         kfree(lq_sta);
2391         IWL_DEBUG_RATE("leave\n");
2392 }
2393
2394
2395 #ifdef CONFIG_MAC80211_DEBUGFS
2396 static int open_file_generic(struct inode *inode, struct file *file)
2397 {
2398         file->private_data = inode->i_private;
2399         return 0;
2400 }
2401 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2402                              u32 *rate_n_flags, int index)
2403 {
2404         struct iwl_priv *priv;
2405
2406         priv = lq_sta->drv;
2407         if (lq_sta->dbg_fixed_rate) {
2408                 if (index < 12) {
2409                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2410                 } else {
2411                         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2412                                 *rate_n_flags = 0x800D;
2413                         else
2414                                 *rate_n_flags = 0x820A;
2415                 }
2416                 IWL_DEBUG_RATE("Fixed rate ON\n");
2417         } else {
2418                 IWL_DEBUG_RATE("Fixed rate OFF\n");
2419         }
2420 }
2421
2422 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2423                         const char __user *user_buf, size_t count, loff_t *ppos)
2424 {
2425         struct iwl_lq_sta *lq_sta = file->private_data;
2426         struct iwl_priv *priv;
2427         char buf[64];
2428         int buf_size;
2429         u32 parsed_rate;
2430
2431         priv = lq_sta->drv;
2432         memset(buf, 0, sizeof(buf));
2433         buf_size = min(count, sizeof(buf) -  1);
2434         if (copy_from_user(buf, user_buf, buf_size))
2435                 return -EFAULT;
2436
2437         if (sscanf(buf, "%x", &parsed_rate) == 1)
2438                 lq_sta->dbg_fixed_rate = parsed_rate;
2439         else
2440                 lq_sta->dbg_fixed_rate = 0;
2441
2442         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2443         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2444         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2445         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2446
2447         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2448                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2449
2450         if (lq_sta->dbg_fixed_rate) {
2451                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2452                 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2453         }
2454
2455         return count;
2456 }
2457
2458 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2459                         char __user *user_buf, size_t count, loff_t *ppos)
2460 {
2461         char buff[1024];
2462         int desc = 0;
2463         int i = 0;
2464
2465         struct iwl_lq_sta *lq_sta = file->private_data;
2466
2467         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2468         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2469                         lq_sta->total_failed, lq_sta->total_success,
2470                         lq_sta->active_legacy_rate);
2471         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2472                         lq_sta->dbg_fixed_rate);
2473         desc += sprintf(buff+desc, "general:"
2474                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2475                 lq_sta->lq.general_params.flags,
2476                 lq_sta->lq.general_params.mimo_delimiter,
2477                 lq_sta->lq.general_params.single_stream_ant_msk,
2478                 lq_sta->lq.general_params.dual_stream_ant_msk);
2479
2480         desc += sprintf(buff+desc, "agg:"
2481                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2482                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2483                         lq_sta->lq.agg_params.agg_dis_start_th,
2484                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2485
2486         desc += sprintf(buff+desc,
2487                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2488                         lq_sta->lq.general_params.start_rate_index[0],
2489                         lq_sta->lq.general_params.start_rate_index[1],
2490                         lq_sta->lq.general_params.start_rate_index[2],
2491                         lq_sta->lq.general_params.start_rate_index[3]);
2492
2493
2494         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2495                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2496                         i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2497
2498         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2499 }
2500
2501 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2502         .write = rs_sta_dbgfs_scale_table_write,
2503         .read = rs_sta_dbgfs_scale_table_read,
2504         .open = open_file_generic,
2505 };
2506 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2507                         char __user *user_buf, size_t count, loff_t *ppos)
2508 {
2509         char buff[1024];
2510         int desc = 0;
2511         int i, j;
2512
2513         struct iwl_lq_sta *lq_sta = file->private_data;
2514         for (i = 0; i < LQ_SIZE; i++) {
2515                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2516                                 "rate=0x%X\n",
2517                                 lq_sta->active_tbl == i ? "*" : "x",
2518                                 lq_sta->lq_info[i].lq_type,
2519                                 lq_sta->lq_info[i].is_SGI,
2520                                 lq_sta->lq_info[i].is_fat,
2521                                 lq_sta->lq_info[i].is_dup,
2522                                 lq_sta->lq_info[i].current_rate);
2523                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2524                         desc += sprintf(buff+desc,
2525                                 "counter=%d success=%d %%=%d\n",
2526                                 lq_sta->lq_info[i].win[j].counter,
2527                                 lq_sta->lq_info[i].win[j].success_counter,
2528                                 lq_sta->lq_info[i].win[j].success_ratio);
2529                 }
2530         }
2531         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2532 }
2533
2534 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2535         .read = rs_sta_dbgfs_stats_table_read,
2536         .open = open_file_generic,
2537 };
2538
2539 static void rs_add_debugfs(void *priv, void *priv_sta,
2540                                         struct dentry *dir)
2541 {
2542         struct iwl_lq_sta *lq_sta = priv_sta;
2543         lq_sta->rs_sta_dbgfs_scale_table_file =
2544                 debugfs_create_file("rate_scale_table", 0600, dir,
2545                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2546         lq_sta->rs_sta_dbgfs_stats_table_file =
2547                 debugfs_create_file("rate_stats_table", 0600, dir,
2548                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2549         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2550                 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2551                 &lq_sta->tx_agg_tid_en);
2552
2553 }
2554
2555 static void rs_remove_debugfs(void *priv, void *priv_sta)
2556 {
2557         struct iwl_lq_sta *lq_sta = priv_sta;
2558         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2559         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2560         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2561 }
2562 #endif
2563
2564 static struct rate_control_ops rs_ops = {
2565         .module = NULL,
2566         .name = RS_NAME,
2567         .tx_status = rs_tx_status,
2568         .get_rate = rs_get_rate,
2569         .rate_init = rs_rate_init,
2570         .alloc = rs_alloc,
2571         .free = rs_free,
2572         .alloc_sta = rs_alloc_sta,
2573         .free_sta = rs_free_sta,
2574 #ifdef CONFIG_MAC80211_DEBUGFS
2575         .add_sta_debugfs = rs_add_debugfs,
2576         .remove_sta_debugfs = rs_remove_debugfs,
2577 #endif
2578 };
2579
2580 int iwlagn_rate_control_register(void)
2581 {
2582         return ieee80211_rate_control_register(&rs_ops);
2583 }
2584
2585 void iwlagn_rate_control_unregister(void)
2586 {
2587         ieee80211_rate_control_unregister(&rs_ops);
2588 }
2589