git.oblomov.eu Git - linux-2.6/blob - drivers/net/wireless/iwlwifi/iwl-agn-rs.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2009 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/wireless.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37
  38 #include "iwl-dev.h"
  39 #include "iwl-sta.h"
  40 #include "iwl-core.h"
  41
  42 #define RS_NAME "iwl-agn-rs"
  43
  44 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  45 #define IWL_NUMBER_TRY      1
  46 #define IWL_HT_NUMBER_TRY   3
  47
  48 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  49 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  50 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  51
  52 /* max allowed rate miss before sync LQ cmd */
  53 #define IWL_MISSED_RATE_MAX             15
  54 /* max time to accum history 2 seconds */
  55 #define IWL_RATE_SCALE_FLUSH_INTVL   (2*HZ)
  56
  57 static u8 rs_ht_to_legacy[] = {
  58         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  59         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  60         IWL_RATE_6M_INDEX,
  61         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  62         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  63         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  64         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  65 };
  66
  67 static const u8 ant_toggle_lookup[] = {
  68         /*ANT_NONE -> */ ANT_NONE,
  69         /*ANT_A    -> */ ANT_B,
  70         /*ANT_B    -> */ ANT_C,
  71         /*ANT_AB   -> */ ANT_BC,
  72         /*ANT_C    -> */ ANT_A,
  73         /*ANT_AC   -> */ ANT_AB,
  74         /*ANT_BC   -> */ ANT_AC,
  75         /*ANT_ABC  -> */ ANT_ABC,
  76 };
  77
  78 /**
  79  * struct iwl_rate_scale_data -- tx success history for one rate
  80  */
  81 struct iwl_rate_scale_data {
  82         u64 data;               /* bitmap of successful frames */
  83         s32 success_counter;    /* number of frames successful */
  84         s32 success_ratio;      /* per-cent * 128  */
  85         s32 counter;            /* number of frames attempted */
  86         s32 average_tpt;        /* success ratio * expected throughput */
  87         unsigned long stamp;
  88 };
  89
  90 /**
  91  * struct iwl_scale_tbl_info -- tx params and success history for all rates
  92  *
  93  * There are two of these in struct iwl_lq_sta,
  94  * one for "active", and one for "search".
  95  */
  96 struct iwl_scale_tbl_info {
  97         enum iwl_table_type lq_type;
  98         u8 ant_type;
  99         u8 is_SGI;      /* 1 = short guard interval */
 100         u8 is_fat;      /* 1 = 40 MHz channel width */
 101         u8 is_dup;      /* 1 = duplicated data streams */
 102         u8 action;      /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
 103         s32 *expected_tpt;      /* throughput metrics; expected_tpt_G, etc. */
 104         u32 current_rate;  /* rate_n_flags, uCode API format */
 105         struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
 106 };
 107
 108 struct iwl_traffic_load {
 109         unsigned long time_stamp;       /* age of the oldest statistics */
 110         u32 packet_count[TID_QUEUE_MAX_SIZE];   /* packet count in this time
 111                                                  * slice */
 112         u32 total;                      /* total num of packets during the
 113                                          * last TID_MAX_TIME_DIFF */
 114         u8 queue_count;                 /* number of queues that has
 115                                          * been used since the last cleanup */
 116         u8 head;                        /* start of the circular buffer */
 117 };
 118
 119 /**
 120  * struct iwl_lq_sta -- driver's rate scaling private structure
 121  *
 122  * Pointer to this gets passed back and forth between driver and mac80211.
 123  */
 124 struct iwl_lq_sta {
 125         u8 active_tbl;          /* index of active table, range 0-1 */
 126         u8 enable_counter;      /* indicates HT mode */
 127         u8 stay_in_tbl;         /* 1: disallow, 0: allow search for new mode */
 128         u8 search_better_tbl;   /* 1: currently trying alternate mode */
 129         s32 last_tpt;
 130
 131         /* The following determine when to search for a new mode */
 132         u32 table_count_limit;
 133         u32 max_failure_limit;  /* # failed frames before new search */
 134         u32 max_success_limit;  /* # successful frames before new search */
 135         u32 table_count;
 136         u32 total_failed;       /* total failed frames, any/all rates */
 137         u32 total_success;      /* total successful frames, any/all rates */
 138         u32 flush_timer;        /* time staying in mode before new search */
 139
 140         u8 action_counter;      /* # mode-switch actions tried */
 141         u8 is_green;
 142         u8 is_dup;
 143         enum ieee80211_band band;
 144         u8 ibss_sta_added;
 145
 146         /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
 147         u32 supp_rates;
 148         u16 active_legacy_rate;
 149         u16 active_siso_rate;
 150         u16 active_mimo2_rate;
 151         u16 active_mimo3_rate;
 152         u16 active_rate_basic;
 153         s8 max_rate_idx;     /* Max rate set by user */
 154         u8 missed_rate_counter;
 155
 156         struct iwl_link_quality_cmd lq;
 157         struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
 158         struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
 159         u8 tx_agg_tid_en;
 160 #ifdef CONFIG_MAC80211_DEBUGFS
 161         struct dentry *rs_sta_dbgfs_scale_table_file;
 162         struct dentry *rs_sta_dbgfs_stats_table_file;
 163         struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
 164         u32 dbg_fixed_rate;
 165 #endif
 166         struct iwl_priv *drv;
 167
 168         /* used to be in sta_info */
 169         int last_txrate_idx;
 170         /* last tx rate_n_flags */
 171         u32 last_rate_n_flags;
 172 };
 173
 174 static void rs_rate_scale_perform(struct iwl_priv *priv,
 175                                    struct ieee80211_hdr *hdr,
 176                                    struct ieee80211_sta *sta,
 177                                    struct iwl_lq_sta *lq_sta);
 178 static void rs_fill_link_cmd(const struct iwl_priv *priv,
 179                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 180
 181
 182 #ifdef CONFIG_MAC80211_DEBUGFS
 183 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 184                              u32 *rate_n_flags, int index);
 185 #else
 186 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 187                              u32 *rate_n_flags, int index)
 188 {}
 189 #endif
 190
 191 /*
 192  * Expected throughput metrics for following rates:
 193  * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 194  * "G" is the only table that supports CCK (the first 4 rates).
 195  */
 196
 197 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
 198         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
 199 };
 200
 201 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
 202         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
 203 };
 204
 205 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
 206         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
 207 };
 208
 209 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
 210         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
 211 };
 212
 213 static s32 expected_tpt_mimo2_20MHz[IWL_RATE_COUNT] = {
 214         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
 215 };
 216
 217 static s32 expected_tpt_mimo2_20MHzSGI[IWL_RATE_COUNT] = {
 218         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
 219 };
 220
 221 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
 222         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
 223 };
 224
 225 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
 226         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
 227 };
 228
 229 static s32 expected_tpt_mimo2_40MHz[IWL_RATE_COUNT] = {
 230         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
 231 };
 232
 233 static s32 expected_tpt_mimo2_40MHzSGI[IWL_RATE_COUNT] = {
 234         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
 235 };
 236
 237 /* Expected throughput metric MIMO3 */
 238 static s32 expected_tpt_mimo3_20MHz[IWL_RATE_COUNT] = {
 239         0, 0, 0, 0, 99, 99, 153, 186, 208, 239, 256, 263, 268
 240 };
 241
 242 static s32 expected_tpt_mimo3_20MHzSGI[IWL_RATE_COUNT] = {
 243         0, 0, 0, 0, 106, 106, 162, 194, 215, 246, 262, 268, 273
 244 };
 245
 246 static s32 expected_tpt_mimo3_40MHz[IWL_RATE_COUNT] = {
 247         0, 0, 0, 0, 152, 152, 211, 239, 255, 279, 290, 294, 297
 248 };
 249
 250 static s32 expected_tpt_mimo3_40MHzSGI[IWL_RATE_COUNT] = {
 251         0, 0, 0, 0, 160, 160, 219, 245, 261, 284, 294, 297, 300
 252 };
 253
 254 /* mbps, mcs */
 255 const static struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 256   {"1", ""},
 257   {"2", ""},
 258   {"5.5", ""},
 259   {"11", ""},
 260   {"6", "BPSK 1/2"},
 261   {"9", "BPSK 1/2"},
 262   {"12", "QPSK 1/2"},
 263   {"18", "QPSK 3/4"},
 264   {"24", "16QAM 1/2"},
 265   {"36", "16QAM 3/4"},
 266   {"48", "64QAM 2/3"},
 267   {"54", "64QAM 3/4"},
 268   {"60", "64QAM 5/6"}
 269 };
 270
 271 static inline u8 rs_extract_rate(u32 rate_n_flags)
 272 {
 273         return (u8)(rate_n_flags & 0xFF);
 274 }
 275
 276 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 277 {
 278         window->data = 0;
 279         window->success_counter = 0;
 280         window->success_ratio = IWL_INVALID_VALUE;
 281         window->counter = 0;
 282         window->average_tpt = IWL_INVALID_VALUE;
 283         window->stamp = 0;
 284 }
 285
 286 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 287 {
 288         return (ant_type & valid_antenna) == ant_type;
 289 }
 290
 291 /*
 292  *      removes the old data from the statistics. All data that is older than
 293  *      TID_MAX_TIME_DIFF, will be deleted.
 294  */
 295 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 296 {
 297         /* The oldest age we want to keep */
 298         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 299
 300         while (tl->queue_count &&
 301                (tl->time_stamp < oldest_time)) {
 302                 tl->total -= tl->packet_count[tl->head];
 303                 tl->packet_count[tl->head] = 0;
 304                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 305                 tl->queue_count--;
 306                 tl->head++;
 307                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 308                         tl->head = 0;
 309         }
 310 }
 311
 312 /*
 313  *      increment traffic load value for tid and also remove
 314  *      any old values if passed the certain time period
 315  */
 316 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 317                            struct ieee80211_hdr *hdr)
 318 {
 319         u32 curr_time = jiffies_to_msecs(jiffies);
 320         u32 time_diff;
 321         s32 index;
 322         struct iwl_traffic_load *tl = NULL;
 323         u8 tid;
 324
 325         if (ieee80211_is_data_qos(hdr->frame_control)) {
 326                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 327                 tid = qc[0] & 0xf;
 328         } else
 329                 return MAX_TID_COUNT;
 330
 331         tl = &lq_data->load[tid];
 332
 333         curr_time -= curr_time % TID_ROUND_VALUE;
 334
 335         /* Happens only for the first packet. Initialize the data */
 336         if (!(tl->queue_count)) {
 337                 tl->total = 1;
 338                 tl->time_stamp = curr_time;
 339                 tl->queue_count = 1;
 340                 tl->head = 0;
 341                 tl->packet_count[0] = 1;
 342                 return MAX_TID_COUNT;
 343         }
 344
 345         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 346         index = time_diff / TID_QUEUE_CELL_SPACING;
 347
 348         /* The history is too long: remove data that is older than */
 349         /* TID_MAX_TIME_DIFF */
 350         if (index >= TID_QUEUE_MAX_SIZE)
 351                 rs_tl_rm_old_stats(tl, curr_time);
 352
 353         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 354         tl->packet_count[index] = tl->packet_count[index] + 1;
 355         tl->total = tl->total + 1;
 356
 357         if ((index + 1) > tl->queue_count)
 358                 tl->queue_count = index + 1;
 359
 360         return tid;
 361 }
 362
 363 /*
 364         get the traffic load value for tid
 365 */
 366 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 367 {
 368         u32 curr_time = jiffies_to_msecs(jiffies);
 369         u32 time_diff;
 370         s32 index;
 371         struct iwl_traffic_load *tl = NULL;
 372
 373         if (tid >= TID_MAX_LOAD_COUNT)
 374                 return 0;
 375
 376         tl = &(lq_data->load[tid]);
 377
 378         curr_time -= curr_time % TID_ROUND_VALUE;
 379
 380         if (!(tl->queue_count))
 381                 return 0;
 382
 383         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 384         index = time_diff / TID_QUEUE_CELL_SPACING;
 385
 386         /* The history is too long: remove data that is older than */
 387         /* TID_MAX_TIME_DIFF */
 388         if (index >= TID_QUEUE_MAX_SIZE)
 389                 rs_tl_rm_old_stats(tl, curr_time);
 390
 391         return tl->total;
 392 }
 393
 394 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 395                                       struct iwl_lq_sta *lq_data, u8 tid,
 396                                       struct ieee80211_sta *sta)
 397 {
 398         if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
 399                 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
 400                                 sta->addr, tid);
 401                 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
 402         }
 403 }
 404
 405 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 406                               struct iwl_lq_sta *lq_data,
 407                               struct ieee80211_sta *sta)
 408 {
 409         if ((tid < TID_MAX_LOAD_COUNT))
 410                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 411         else if (tid == IWL_AGG_ALL_TID)
 412                 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
 413                         rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 414 }
 415
 416 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 417 {
 418         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 419                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 420                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 421 }
 422
 423 /**
 424  * rs_collect_tx_data - Update the success/failure sliding window
 425  *
 426  * We keep a sliding window of the last 62 packets transmitted
 427  * at this rate.  window->data contains the bitmask of successful
 428  * packets.
 429  */
 430 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
 431                               int scale_index, s32 tpt, int retries,
 432                               int successes)
 433 {
 434         struct iwl_rate_scale_data *window = NULL;
 435         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 436         s32 fail_count;
 437
 438         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 439                 return -EINVAL;
 440
 441         /* Select data for current tx bit rate */
 442         window = &(windows[scale_index]);
 443
 444         /*
 445          * Keep track of only the latest 62 tx frame attempts in this rate's
 446          * history window; anything older isn't really relevant any more.
 447          * If we have filled up the sliding window, drop the oldest attempt;
 448          * if the oldest attempt (highest bit in bitmap) shows "success",
 449          * subtract "1" from the success counter (this is the main reason
 450          * we keep these bitmaps!).
 451          */
 452         while (retries > 0) {
 453                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 454
 455                         /* remove earliest */
 456                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 457
 458                         if (window->data & mask) {
 459                                 window->data &= ~mask;
 460                                 window->success_counter--;
 461                         }
 462                 }
 463
 464                 /* Increment frames-attempted counter */
 465                 window->counter++;
 466
 467                 /* Shift bitmap by one frame (throw away oldest history),
 468                  * OR in "1", and increment "success" if this
 469                  * frame was successful. */
 470                 window->data <<= 1;
 471                 if (successes > 0) {
 472                         window->success_counter++;
 473                         window->data |= 0x1;
 474                         successes--;
 475                 }
 476
 477                 retries--;
 478         }
 479
 480         /* Calculate current success ratio, avoid divide-by-0! */
 481         if (window->counter > 0)
 482                 window->success_ratio = 128 * (100 * window->success_counter)
 483                                         / window->counter;
 484         else
 485                 window->success_ratio = IWL_INVALID_VALUE;
 486
 487         fail_count = window->counter - window->success_counter;
 488
 489         /* Calculate average throughput, if we have enough history. */
 490         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 491             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 492                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 493         else
 494                 window->average_tpt = IWL_INVALID_VALUE;
 495
 496         /* Tag this window as having been updated */
 497         window->stamp = jiffies;
 498
 499         return 0;
 500 }
 501
 502 /*
 503  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 504  */
 505 /* FIXME:RS:remove this function and put the flags statically in the table */
 506 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
 507                                  struct iwl_scale_tbl_info *tbl,
 508                                  int index, u8 use_green)
 509 {
 510         u32 rate_n_flags = 0;
 511
 512         if (is_legacy(tbl->lq_type)) {
 513                 rate_n_flags = iwl_rates[index].plcp;
 514                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 515                         rate_n_flags |= RATE_MCS_CCK_MSK;
 516
 517         } else if (is_Ht(tbl->lq_type)) {
 518                 if (index > IWL_LAST_OFDM_RATE) {
 519                         IWL_ERR(priv, "Invalid HT rate index %d\n", index);
 520                         index = IWL_LAST_OFDM_RATE;
 521                 }
 522                 rate_n_flags = RATE_MCS_HT_MSK;
 523
 524                 if (is_siso(tbl->lq_type))
 525                         rate_n_flags |= iwl_rates[index].plcp_siso;
 526                 else if (is_mimo2(tbl->lq_type))
 527                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 528                 else
 529                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 530         } else {
 531                 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 532         }
 533
 534         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 535                                                      RATE_MCS_ANT_ABC_MSK);
 536
 537         if (is_Ht(tbl->lq_type)) {
 538                 if (tbl->is_fat) {
 539                         if (tbl->is_dup)
 540                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 541                         else
 542                                 rate_n_flags |= RATE_MCS_FAT_MSK;
 543                 }
 544                 if (tbl->is_SGI)
 545                         rate_n_flags |= RATE_MCS_SGI_MSK;
 546
 547                 if (use_green) {
 548                         rate_n_flags |= RATE_MCS_GF_MSK;
 549                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 550                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 551                                 IWL_ERR(priv, "GF was set with SGI:SISO\n");
 552                         }
 553                 }
 554         }
 555         return rate_n_flags;
 556 }
 557
 558 /*
 559  * Interpret uCode API's rate_n_flags format,
 560  * fill "search" or "active" tx mode table.
 561  */
 562 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 563                                     enum ieee80211_band band,
 564                                     struct iwl_scale_tbl_info *tbl,
 565                                     int *rate_idx)
 566 {
 567         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 568         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 569         u8 mcs;
 570
 571         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 572
 573         if (*rate_idx  == IWL_RATE_INVALID) {
 574                 *rate_idx = -1;
 575                 return -EINVAL;
 576         }
 577         tbl->is_SGI = 0;        /* default legacy setup */
 578         tbl->is_fat = 0;
 579         tbl->is_dup = 0;
 580         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 581         tbl->lq_type = LQ_NONE;
 582
 583         /* legacy rate format */
 584         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 585                 if (num_of_ant == 1) {
 586                         if (band == IEEE80211_BAND_5GHZ)
 587                                 tbl->lq_type = LQ_A;
 588                         else
 589                                 tbl->lq_type = LQ_G;
 590                 }
 591         /* HT rate format */
 592         } else {
 593                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 594                         tbl->is_SGI = 1;
 595
 596                 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
 597                     (rate_n_flags & RATE_MCS_DUP_MSK))
 598                         tbl->is_fat = 1;
 599
 600                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 601                         tbl->is_dup = 1;
 602
 603                 mcs = rs_extract_rate(rate_n_flags);
 604
 605                 /* SISO */
 606                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 607                         if (num_of_ant == 1)
 608                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 609                 /* MIMO2 */
 610                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 611                         if (num_of_ant == 2)
 612                                 tbl->lq_type = LQ_MIMO2;
 613                 /* MIMO3 */
 614                 } else {
 615                         if (num_of_ant == 3)
 616                                 tbl->lq_type = LQ_MIMO3;
 617                 }
 618         }
 619         return 0;
 620 }
 621
 622 /* switch to another antenna/antennas and return 1 */
 623 /* if no other valid antenna found, return 0 */
 624 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 625                              struct iwl_scale_tbl_info *tbl)
 626 {
 627         u8 new_ant_type;
 628
 629         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 630                 return 0;
 631
 632         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 633                 return 0;
 634
 635         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 636
 637         while ((new_ant_type != tbl->ant_type) &&
 638                !rs_is_valid_ant(valid_ant, new_ant_type))
 639                 new_ant_type = ant_toggle_lookup[new_ant_type];
 640
 641         if (new_ant_type == tbl->ant_type)
 642                 return 0;
 643
 644         tbl->ant_type = new_ant_type;
 645         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 646         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 647         return 1;
 648 }
 649
 650 /* FIXME:RS: in 4965 we don't use greenfield at all */
 651 /* FIXME:RS: don't use greenfield for now in TX */
 652 #if 0
 653 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
 654 {
 655         return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
 656                 priv->current_ht_config.is_green_field &&
 657                 !priv->current_ht_config.non_GF_STA_present;
 658 }
 659 #endif
 660 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
 661 {
 662         return 0;
 663 }
 664
 665 /**
 666  * rs_get_supported_rates - get the available rates
 667  *
 668  * if management frame or broadcast frame only return
 669  * basic available rates.
 670  *
 671  */
 672 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 673                                   struct ieee80211_hdr *hdr,
 674                                   enum iwl_table_type rate_type)
 675 {
 676         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
 677             lq_sta->active_rate_basic)
 678                 return lq_sta->active_rate_basic;
 679
 680         if (is_legacy(rate_type)) {
 681                 return lq_sta->active_legacy_rate;
 682         } else {
 683                 if (is_siso(rate_type))
 684                         return lq_sta->active_siso_rate;
 685                 else if (is_mimo2(rate_type))
 686                         return lq_sta->active_mimo2_rate;
 687                 else
 688                         return lq_sta->active_mimo3_rate;
 689         }
 690 }
 691
 692 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 693                                 int rate_type)
 694 {
 695         u8 high = IWL_RATE_INVALID;
 696         u8 low = IWL_RATE_INVALID;
 697
 698         /* 802.11A or ht walks to the next literal adjacent rate in
 699          * the rate table */
 700         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 701                 int i;
 702                 u32 mask;
 703
 704                 /* Find the previous rate that is in the rate mask */
 705                 i = index - 1;
 706                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 707                         if (rate_mask & mask) {
 708                                 low = i;
 709                                 break;
 710                         }
 711                 }
 712
 713                 /* Find the next rate that is in the rate mask */
 714                 i = index + 1;
 715                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 716                         if (rate_mask & mask) {
 717                                 high = i;
 718                                 break;
 719                         }
 720                 }
 721
 722                 return (high << 8) | low;
 723         }
 724
 725         low = index;
 726         while (low != IWL_RATE_INVALID) {
 727                 low = iwl_rates[low].prev_rs;
 728                 if (low == IWL_RATE_INVALID)
 729                         break;
 730                 if (rate_mask & (1 << low))
 731                         break;
 732                 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
 733         }
 734
 735         high = index;
 736         while (high != IWL_RATE_INVALID) {
 737                 high = iwl_rates[high].next_rs;
 738                 if (high == IWL_RATE_INVALID)
 739                         break;
 740                 if (rate_mask & (1 << high))
 741                         break;
 742                 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
 743         }
 744
 745         return (high << 8) | low;
 746 }
 747
 748 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 749                              struct iwl_scale_tbl_info *tbl,
 750                              u8 scale_index, u8 ht_possible)
 751 {
 752         s32 low;
 753         u16 rate_mask;
 754         u16 high_low;
 755         u8 switch_to_legacy = 0;
 756         u8 is_green = lq_sta->is_green;
 757
 758         /* check if we need to switch from HT to legacy rates.
 759          * assumption is that mandatory rates (1Mbps or 6Mbps)
 760          * are always supported (spec demand) */
 761         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 762                 switch_to_legacy = 1;
 763                 scale_index = rs_ht_to_legacy[scale_index];
 764                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 765                         tbl->lq_type = LQ_A;
 766                 else
 767                         tbl->lq_type = LQ_G;
 768
 769                 if (num_of_ant(tbl->ant_type) > 1)
 770                         tbl->ant_type = ANT_A;/*FIXME:RS*/
 771
 772                 tbl->is_fat = 0;
 773                 tbl->is_SGI = 0;
 774         }
 775
 776         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 777
 778         /* Mask with station rate restriction */
 779         if (is_legacy(tbl->lq_type)) {
 780                 /* supp_rates has no CCK bits in A mode */
 781                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 782                         rate_mask  = (u16)(rate_mask &
 783                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 784                 else
 785                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 786         }
 787
 788         /* If we switched from HT to legacy, check current rate */
 789         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 790                 low = scale_index;
 791                 goto out;
 792         }
 793
 794         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 795                                         tbl->lq_type);
 796         low = high_low & 0xff;
 797
 798         if (low == IWL_RATE_INVALID)
 799                 low = scale_index;
 800
 801 out:
 802         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 803 }
 804
 805 /*
 806  * mac80211 sends us Tx status
 807  */
 808 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 809                          struct ieee80211_sta *sta, void *priv_sta,
 810                          struct sk_buff *skb)
 811 {
 812         int status;
 813         u8 retries;
 814         int rs_index, index = 0;
 815         struct iwl_lq_sta *lq_sta = priv_sta;
 816         struct iwl_link_quality_cmd *table;
 817         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 818         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
 819         struct ieee80211_hw *hw = priv->hw;
 820         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 821         struct iwl_rate_scale_data *window = NULL;
 822         struct iwl_rate_scale_data *search_win = NULL;
 823         u32 tx_rate;
 824         struct iwl_scale_tbl_info tbl_type;
 825         struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
 826         u8 active_index = 0;
 827         s32 tpt = 0;
 828
 829         IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
 830
 831         if (!ieee80211_is_data(hdr->frame_control) ||
 832             is_multicast_ether_addr(hdr->addr1))
 833                 return;
 834
 835         /* This packet was aggregated but doesn't carry rate scale info */
 836         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 837             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 838                 return;
 839
 840         if (info->flags & IEEE80211_TX_STAT_AMPDU)
 841                 retries = 0;
 842         else
 843                 retries = info->status.rates[0].count - 1;
 844
 845         if (retries > 15)
 846                 retries = 15;
 847
 848         if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
 849             !lq_sta->ibss_sta_added)
 850                 goto out;
 851
 852         table = &lq_sta->lq;
 853         active_index = lq_sta->active_tbl;
 854
 855         curr_tbl = &(lq_sta->lq_info[active_index]);
 856         search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
 857         window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
 858         search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
 859
 860         /*
 861          * Ignore this Tx frame response if its initial rate doesn't match
 862          * that of latest Link Quality command.  There may be stragglers
 863          * from a previous Link Quality command, but we're no longer interested
 864          * in those; they're either from the "active" mode while we're trying
 865          * to check "search" mode, or a prior "search" mode after we've moved
 866          * to a new "search" mode (which might become the new "active" mode).
 867          */
 868         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 869         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 870         if (priv->band == IEEE80211_BAND_5GHZ)
 871                 rs_index -= IWL_FIRST_OFDM_RATE;
 872
 873         if ((info->status.rates[0].idx < 0) ||
 874             (tbl_type.is_SGI != !!(info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)) ||
 875             (tbl_type.is_fat != !!(info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 876             (tbl_type.is_dup != !!(info->status.rates[0].flags & IEEE80211_TX_RC_DUP_DATA)) ||
 877             (tbl_type.ant_type != info->antenna_sel_tx) ||
 878             (!!(tx_rate & RATE_MCS_HT_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) ||
 879             (!!(tx_rate & RATE_MCS_GF_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 880             (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
 881              hw->wiphy->bands[info->band]->bitrates[info->status.rates[0].idx].bitrate)) {
 882                 IWL_DEBUG_RATE(priv, "initial rate does not match 0x%x\n", tx_rate);
 883                 /* the last LQ command could failed so the LQ in ucode not
 884                  * the same in driver sync up
 885                  */
 886                 lq_sta->missed_rate_counter++;
 887                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 888                         lq_sta->missed_rate_counter = 0;
 889                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
 890                 }
 891                 goto out;
 892         }
 893
 894         lq_sta->missed_rate_counter = 0;
 895         /* Update frame history window with "failure" for each Tx retry. */
 896         while (retries) {
 897                 /* Look up the rate and other info used for each tx attempt.
 898                  * Each tx attempt steps one entry deeper in the rate table. */
 899                 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 900                 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
 901                                           &tbl_type, &rs_index);
 902
 903                 /* If type matches "search" table,
 904                  * add failure to "search" history */
 905                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 906                     (tbl_type.ant_type == search_tbl->ant_type) &&
 907                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 908                         if (search_tbl->expected_tpt)
 909                                 tpt = search_tbl->expected_tpt[rs_index];
 910                         else
 911                                 tpt = 0;
 912                         rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
 913
 914                 /* Else if type matches "current/active" table,
 915                  * add failure to "current/active" history */
 916                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 917                            (tbl_type.ant_type == curr_tbl->ant_type) &&
 918                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 919                         if (curr_tbl->expected_tpt)
 920                                 tpt = curr_tbl->expected_tpt[rs_index];
 921                         else
 922                                 tpt = 0;
 923                         rs_collect_tx_data(window, rs_index, tpt, 1, 0);
 924                 }
 925
 926                 /* If not searching for a new mode, increment failed counter
 927                  * ... this helps determine when to start searching again */
 928                 if (lq_sta->stay_in_tbl)
 929                         lq_sta->total_failed++;
 930                 --retries;
 931                 index++;
 932
 933         }
 934
 935         /*
 936          * Find (by rate) the history window to update with final Tx attempt;
 937          * if Tx was successful first try, use original rate,
 938          * else look up the rate that was, finally, successful.
 939          */
 940         tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 941         lq_sta->last_rate_n_flags = tx_rate;
 942         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 943
 944         /* Update frame history window with "success" if Tx got ACKed ... */
 945         status = !!(info->flags & IEEE80211_TX_STAT_ACK);
 946
 947         /* If type matches "search" table,
 948          * add final tx status to "search" history */
 949         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 950             (tbl_type.ant_type == search_tbl->ant_type) &&
 951             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 952                 if (search_tbl->expected_tpt)
 953                         tpt = search_tbl->expected_tpt[rs_index];
 954                 else
 955                         tpt = 0;
 956                 if (info->flags & IEEE80211_TX_STAT_AMPDU)
 957                         rs_collect_tx_data(search_win, rs_index, tpt,
 958                                            info->status.ampdu_ack_len,
 959                                            info->status.ampdu_ack_map);
 960                 else
 961                         rs_collect_tx_data(search_win, rs_index, tpt,
 962                                            1, status);
 963         /* Else if type matches "current/active" table,
 964          * add final tx status to "current/active" history */
 965         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 966                    (tbl_type.ant_type == curr_tbl->ant_type) &&
 967                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 968                 if (curr_tbl->expected_tpt)
 969                         tpt = curr_tbl->expected_tpt[rs_index];
 970                 else
 971                         tpt = 0;
 972                 if (info->flags & IEEE80211_TX_STAT_AMPDU)
 973                         rs_collect_tx_data(window, rs_index, tpt,
 974                                            info->status.ampdu_ack_len,
 975                                            info->status.ampdu_ack_map);
 976                 else
 977                         rs_collect_tx_data(window, rs_index, tpt,
 978                                            1, status);
 979         }
 980
 981         /* If not searching for new mode, increment success/failed counter
 982          * ... these help determine when to start searching again */
 983         if (lq_sta->stay_in_tbl) {
 984                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
 985                         lq_sta->total_success += info->status.ampdu_ack_map;
 986                         lq_sta->total_failed +=
 987                              (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
 988                 } else {
 989                         if (status)
 990                                 lq_sta->total_success++;
 991                         else
 992                                 lq_sta->total_failed++;
 993                 }
 994         }
 995
 996         /* See if there's a better rate or modulation mode to try. */
 997         if (sta && sta->supp_rates[sband->band])
 998                 rs_rate_scale_perform(priv, hdr, sta, lq_sta);
 999 out:
1000         return;
1001 }
1002
1003 /*
1004  * Begin a period of staying with a selected modulation mode.
1005  * Set "stay_in_tbl" flag to prevent any mode switches.
1006  * Set frame tx success limits according to legacy vs. high-throughput,
1007  * and reset overall (spanning all rates) tx success history statistics.
1008  * These control how long we stay using same modulation mode before
1009  * searching for a new mode.
1010  */
1011 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1012                                  struct iwl_lq_sta *lq_sta)
1013 {
1014         IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1015         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1016         if (is_legacy) {
1017                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1018                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1019                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1020         } else {
1021                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1022                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1023                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1024         }
1025         lq_sta->table_count = 0;
1026         lq_sta->total_failed = 0;
1027         lq_sta->total_success = 0;
1028 }
1029
1030 /*
1031  * Find correct throughput table for given mode of modulation
1032  */
1033 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1034                                       struct iwl_scale_tbl_info *tbl)
1035 {
1036         if (is_legacy(tbl->lq_type)) {
1037                 if (!is_a_band(tbl->lq_type))
1038                         tbl->expected_tpt = expected_tpt_G;
1039                 else
1040                         tbl->expected_tpt = expected_tpt_A;
1041         } else if (is_siso(tbl->lq_type)) {
1042                 if (tbl->is_fat && !lq_sta->is_dup)
1043                         if (tbl->is_SGI)
1044                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1045                         else
1046                                 tbl->expected_tpt = expected_tpt_siso40MHz;
1047                 else if (tbl->is_SGI)
1048                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1049                 else
1050                         tbl->expected_tpt = expected_tpt_siso20MHz;
1051         } else if (is_mimo2(tbl->lq_type)) {
1052                 if (tbl->is_fat && !lq_sta->is_dup)
1053                         if (tbl->is_SGI)
1054                                 tbl->expected_tpt = expected_tpt_mimo2_40MHzSGI;
1055                         else
1056                                 tbl->expected_tpt = expected_tpt_mimo2_40MHz;
1057                 else if (tbl->is_SGI)
1058                         tbl->expected_tpt = expected_tpt_mimo2_20MHzSGI;
1059                 else
1060                         tbl->expected_tpt = expected_tpt_mimo2_20MHz;
1061         } else if (is_mimo3(tbl->lq_type)) {
1062                 if (tbl->is_fat && !lq_sta->is_dup)
1063                         if (tbl->is_SGI)
1064                                 tbl->expected_tpt = expected_tpt_mimo3_40MHzSGI;
1065                         else
1066                                 tbl->expected_tpt = expected_tpt_mimo3_40MHz;
1067                 else if (tbl->is_SGI)
1068                         tbl->expected_tpt = expected_tpt_mimo3_20MHzSGI;
1069                 else
1070                         tbl->expected_tpt = expected_tpt_mimo3_20MHz;
1071         } else
1072                 tbl->expected_tpt = expected_tpt_G;
1073 }
1074
1075 /*
1076  * Find starting rate for new "search" high-throughput mode of modulation.
1077  * Goal is to find lowest expected rate (under perfect conditions) that is
1078  * above the current measured throughput of "active" mode, to give new mode
1079  * a fair chance to prove itself without too many challenges.
1080  *
1081  * This gets called when transitioning to more aggressive modulation
1082  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1083  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1084  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1085  * bit rate will typically need to increase, but not if performance was bad.
1086  */
1087 static s32 rs_get_best_rate(struct iwl_priv *priv,
1088                             struct iwl_lq_sta *lq_sta,
1089                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1090                             u16 rate_mask, s8 index)
1091 {
1092         /* "active" values */
1093         struct iwl_scale_tbl_info *active_tbl =
1094             &(lq_sta->lq_info[lq_sta->active_tbl]);
1095         s32 active_sr = active_tbl->win[index].success_ratio;
1096         s32 active_tpt = active_tbl->expected_tpt[index];
1097
1098         /* expected "search" throughput */
1099         s32 *tpt_tbl = tbl->expected_tpt;
1100
1101         s32 new_rate, high, low, start_hi;
1102         u16 high_low;
1103         s8 rate = index;
1104
1105         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1106
1107         for (; ;) {
1108                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1109                                                 tbl->lq_type);
1110
1111                 low = high_low & 0xff;
1112                 high = (high_low >> 8) & 0xff;
1113
1114                 /*
1115                  * Lower the "search" bit rate, to give new "search" mode
1116                  * approximately the same throughput as "active" if:
1117                  *
1118                  * 1) "Active" mode has been working modestly well (but not
1119                  *    great), and expected "search" throughput (under perfect
1120                  *    conditions) at candidate rate is above the actual
1121                  *    measured "active" throughput (but less than expected
1122                  *    "active" throughput under perfect conditions).
1123                  * OR
1124                  * 2) "Active" mode has been working perfectly or very well
1125                  *    and expected "search" throughput (under perfect
1126                  *    conditions) at candidate rate is above expected
1127                  *    "active" throughput (under perfect conditions).
1128                  */
1129                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1130                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1131                       (active_sr <= IWL_RATE_HIGH_TH) &&
1132                       (tpt_tbl[rate] <= active_tpt))) ||
1133                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1134                      (tpt_tbl[rate] > active_tpt))) {
1135
1136                         /* (2nd or later pass)
1137                          * If we've already tried to raise the rate, and are
1138                          * now trying to lower it, use the higher rate. */
1139                         if (start_hi != IWL_RATE_INVALID) {
1140                                 new_rate = start_hi;
1141                                 break;
1142                         }
1143
1144                         new_rate = rate;
1145
1146                         /* Loop again with lower rate */
1147                         if (low != IWL_RATE_INVALID)
1148                                 rate = low;
1149
1150                         /* Lower rate not available, use the original */
1151                         else
1152                                 break;
1153
1154                 /* Else try to raise the "search" rate to match "active" */
1155                 } else {
1156                         /* (2nd or later pass)
1157                          * If we've already tried to lower the rate, and are
1158                          * now trying to raise it, use the lower rate. */
1159                         if (new_rate != IWL_RATE_INVALID)
1160                                 break;
1161
1162                         /* Loop again with higher rate */
1163                         else if (high != IWL_RATE_INVALID) {
1164                                 start_hi = high;
1165                                 rate = high;
1166
1167                         /* Higher rate not available, use the original */
1168                         } else {
1169                                 new_rate = rate;
1170                                 break;
1171                         }
1172                 }
1173         }
1174
1175         return new_rate;
1176 }
1177
1178 /*
1179  * Set up search table for MIMO2
1180  */
1181 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1182                              struct iwl_lq_sta *lq_sta,
1183                              struct ieee80211_conf *conf,
1184                              struct ieee80211_sta *sta,
1185                              struct iwl_scale_tbl_info *tbl, int index)
1186 {
1187         u16 rate_mask;
1188         s32 rate;
1189         s8 is_green = lq_sta->is_green;
1190
1191         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1192                 return -1;
1193
1194         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1195                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1196                 return -1;
1197
1198         /* Need both Tx chains/antennas to support MIMO */
1199         if (priv->hw_params.tx_chains_num < 2)
1200                 return -1;
1201
1202         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1203
1204         tbl->lq_type = LQ_MIMO2;
1205         tbl->is_dup = lq_sta->is_dup;
1206         tbl->action = 0;
1207         rate_mask = lq_sta->active_mimo2_rate;
1208
1209         if (priv->current_ht_config.supported_chan_width
1210                                         == IWL_CHANNEL_WIDTH_40MHZ)
1211                 tbl->is_fat = 1;
1212         else
1213                 tbl->is_fat = 0;
1214
1215         /* FIXME: - don't toggle SGI here
1216         if (tbl->is_fat) {
1217                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1218                         tbl->is_SGI = 1;
1219                 else
1220                         tbl->is_SGI = 0;
1221         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1222                 tbl->is_SGI = 1;
1223         else
1224                 tbl->is_SGI = 0;
1225         */
1226
1227         rs_set_expected_tpt_table(lq_sta, tbl);
1228
1229         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1230
1231         IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1232         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1233                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1234                                                 rate, rate_mask);
1235                 return -1;
1236         }
1237         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1238
1239         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1240                      tbl->current_rate, is_green);
1241         return 0;
1242 }
1243
1244 /*
1245  * Set up search table for MIMO3
1246  */
1247 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1248                              struct iwl_lq_sta *lq_sta,
1249                              struct ieee80211_conf *conf,
1250                              struct ieee80211_sta *sta,
1251                              struct iwl_scale_tbl_info *tbl, int index)
1252 {
1253         u16 rate_mask;
1254         s32 rate;
1255         s8 is_green = lq_sta->is_green;
1256
1257         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1258                 return -1;
1259
1260         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1261                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1262                 return -1;
1263
1264         /* Need both Tx chains/antennas to support MIMO */
1265         if (priv->hw_params.tx_chains_num < 3)
1266                 return -1;
1267
1268         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1269
1270         tbl->lq_type = LQ_MIMO3;
1271         tbl->is_dup = lq_sta->is_dup;
1272         tbl->action = 0;
1273         rate_mask = lq_sta->active_mimo3_rate;
1274
1275         if (priv->current_ht_config.supported_chan_width
1276                                         == IWL_CHANNEL_WIDTH_40MHZ)
1277                 tbl->is_fat = 1;
1278         else
1279                 tbl->is_fat = 0;
1280
1281         /* FIXME: - don't toggle SGI here
1282         if (tbl->is_fat) {
1283                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1284                         tbl->is_SGI = 1;
1285                 else
1286                         tbl->is_SGI = 0;
1287         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1288                 tbl->is_SGI = 1;
1289         else
1290                 tbl->is_SGI = 0;
1291         */
1292
1293         rs_set_expected_tpt_table(lq_sta, tbl);
1294
1295         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1296
1297         IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1298                 rate, rate_mask);
1299         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1300                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1301                                                 rate, rate_mask);
1302                 return -1;
1303         }
1304         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1305
1306         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1307                      tbl->current_rate, is_green);
1308         return 0;
1309 }
1310
1311 /*
1312  * Set up search table for SISO
1313  */
1314 static int rs_switch_to_siso(struct iwl_priv *priv,
1315                              struct iwl_lq_sta *lq_sta,
1316                              struct ieee80211_conf *conf,
1317                              struct ieee80211_sta *sta,
1318                              struct iwl_scale_tbl_info *tbl, int index)
1319 {
1320         u16 rate_mask;
1321         u8 is_green = lq_sta->is_green;
1322         s32 rate;
1323
1324         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1325                 return -1;
1326
1327         IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1328
1329         tbl->is_dup = lq_sta->is_dup;
1330         tbl->lq_type = LQ_SISO;
1331         tbl->action = 0;
1332         rate_mask = lq_sta->active_siso_rate;
1333
1334         if (priv->current_ht_config.supported_chan_width
1335             == IWL_CHANNEL_WIDTH_40MHZ)
1336                 tbl->is_fat = 1;
1337         else
1338                 tbl->is_fat = 0;
1339
1340         /* FIXME: - don't toggle SGI here
1341         if (tbl->is_fat) {
1342                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1343                         tbl->is_SGI = 1;
1344                 else
1345                         tbl->is_SGI = 0;
1346         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1347                 tbl->is_SGI = 1;
1348         else
1349                 tbl->is_SGI = 0;
1350         */
1351
1352         if (is_green)
1353                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1354
1355         rs_set_expected_tpt_table(lq_sta, tbl);
1356         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1357
1358         IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1359         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1360                 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1361                              rate, rate_mask);
1362                 return -1;
1363         }
1364         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1365         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1366                      tbl->current_rate, is_green);
1367         return 0;
1368 }
1369
1370 /*
1371  * Try to switch to new modulation mode from legacy
1372  */
1373 static int rs_move_legacy_other(struct iwl_priv *priv,
1374                                 struct iwl_lq_sta *lq_sta,
1375                                 struct ieee80211_conf *conf,
1376                                 struct ieee80211_sta *sta,
1377                                 int index)
1378 {
1379         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1380         struct iwl_scale_tbl_info *search_tbl =
1381                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1382         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1383         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1384                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1385         u8 start_action = tbl->action;
1386         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1387         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1388         int ret = 0;
1389
1390         for (; ;) {
1391                 switch (tbl->action) {
1392                 case IWL_LEGACY_SWITCH_ANTENNA1:
1393                 case IWL_LEGACY_SWITCH_ANTENNA2:
1394                         IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1395
1396                         lq_sta->action_counter++;
1397
1398                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1399                                                         tx_chains_num <= 1) ||
1400                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1401                                                         tx_chains_num <= 2))
1402                                 break;
1403
1404                         /* Don't change antenna if success has been great */
1405                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1406                                 break;
1407
1408                         /* Set up search table to try other antenna */
1409                         memcpy(search_tbl, tbl, sz);
1410
1411                         if (rs_toggle_antenna(valid_tx_ant,
1412                                 &search_tbl->current_rate, search_tbl)) {
1413                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1414                                 goto out;
1415                         }
1416                         break;
1417                 case IWL_LEGACY_SWITCH_SISO:
1418                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1419
1420                         /* Set up search table to try SISO */
1421                         memcpy(search_tbl, tbl, sz);
1422                         search_tbl->is_SGI = 0;
1423                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1424                                                  search_tbl, index);
1425                         if (!ret) {
1426                                 lq_sta->action_counter = 0;
1427                                 goto out;
1428                         }
1429
1430                         break;
1431                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1432                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1433                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1434                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1435
1436                         /* Set up search table to try MIMO */
1437                         memcpy(search_tbl, tbl, sz);
1438                         search_tbl->is_SGI = 0;
1439
1440                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1441                                 search_tbl->ant_type = ANT_AB;
1442                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1443                                 search_tbl->ant_type = ANT_AC;
1444                         else
1445                                 search_tbl->ant_type = ANT_BC;
1446
1447                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1448                                 break;
1449
1450                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1451                                                  search_tbl, index);
1452                         if (!ret) {
1453                                 lq_sta->action_counter = 0;
1454                                 goto out;
1455                         }
1456                         break;
1457
1458                 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1459                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1460
1461                         /* Set up search table to try MIMO3 */
1462                         memcpy(search_tbl, tbl, sz);
1463                         search_tbl->is_SGI = 0;
1464
1465                         search_tbl->ant_type = ANT_ABC;
1466
1467                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1468                                 break;
1469
1470                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1471                                                  search_tbl, index);
1472                         if (!ret) {
1473                                 lq_sta->action_counter = 0;
1474                                 goto out;
1475                         }
1476                         break;
1477                 }
1478                 tbl->action++;
1479                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1480                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1481
1482                 if (tbl->action == start_action)
1483                         break;
1484
1485         }
1486         search_tbl->lq_type = LQ_NONE;
1487         return 0;
1488
1489 out:
1490         lq_sta->search_better_tbl = 1;
1491         tbl->action++;
1492         if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1493                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1494         return 0;
1495
1496 }
1497
1498 /*
1499  * Try to switch to new modulation mode from SISO
1500  */
1501 static int rs_move_siso_to_other(struct iwl_priv *priv,
1502                                  struct iwl_lq_sta *lq_sta,
1503                                  struct ieee80211_conf *conf,
1504                                  struct ieee80211_sta *sta, int index)
1505 {
1506         u8 is_green = lq_sta->is_green;
1507         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1508         struct iwl_scale_tbl_info *search_tbl =
1509                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1510         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1511         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1512                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1513         u8 start_action = tbl->action;
1514         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1515         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1516         int ret;
1517
1518         for (;;) {
1519                 lq_sta->action_counter++;
1520                 switch (tbl->action) {
1521                 case IWL_SISO_SWITCH_ANTENNA1:
1522                 case IWL_SISO_SWITCH_ANTENNA2:
1523                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1524
1525                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1526                                                         tx_chains_num <= 1) ||
1527                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1528                                                         tx_chains_num <= 2))
1529                                 break;
1530
1531                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1532                                 break;
1533
1534                         memcpy(search_tbl, tbl, sz);
1535                         if (rs_toggle_antenna(valid_tx_ant,
1536                                        &search_tbl->current_rate, search_tbl))
1537                                 goto out;
1538                         break;
1539                 case IWL_SISO_SWITCH_MIMO2_AB:
1540                 case IWL_SISO_SWITCH_MIMO2_AC:
1541                 case IWL_SISO_SWITCH_MIMO2_BC:
1542                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1543                         memcpy(search_tbl, tbl, sz);
1544                         search_tbl->is_SGI = 0;
1545
1546                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1547                                 search_tbl->ant_type = ANT_AB;
1548                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1549                                 search_tbl->ant_type = ANT_AC;
1550                         else
1551                                 search_tbl->ant_type = ANT_BC;
1552
1553                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1554                                 break;
1555
1556                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1557                                                  search_tbl, index);
1558                         if (!ret)
1559                                 goto out;
1560                         break;
1561                 case IWL_SISO_SWITCH_GI:
1562                         if (!tbl->is_fat &&
1563                                 !(priv->current_ht_config.sgf &
1564                                                 HT_SHORT_GI_20MHZ))
1565                                 break;
1566                         if (tbl->is_fat &&
1567                                 !(priv->current_ht_config.sgf &
1568                                                 HT_SHORT_GI_40MHZ))
1569                                 break;
1570
1571                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1572
1573                         memcpy(search_tbl, tbl, sz);
1574                         if (is_green) {
1575                                 if (!tbl->is_SGI)
1576                                         break;
1577                                 else
1578                                         IWL_ERR(priv,
1579                                                 "SGI was set in GF+SISO\n");
1580                         }
1581                         search_tbl->is_SGI = !tbl->is_SGI;
1582                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1583                         if (tbl->is_SGI) {
1584                                 s32 tpt = lq_sta->last_tpt / 100;
1585                                 if (tpt >= search_tbl->expected_tpt[index])
1586                                         break;
1587                         }
1588                         search_tbl->current_rate =
1589                                 rate_n_flags_from_tbl(priv, search_tbl,
1590                                                       index, is_green);
1591                         goto out;
1592                 case IWL_SISO_SWITCH_MIMO3_ABC:
1593                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1594                         memcpy(search_tbl, tbl, sz);
1595                         search_tbl->is_SGI = 0;
1596                         search_tbl->ant_type = ANT_ABC;
1597
1598                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1599                                 break;
1600
1601                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1602                                                  search_tbl, index);
1603                         if (!ret)
1604                                 goto out;
1605                         break;
1606                 }
1607                 tbl->action++;
1608                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1609                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1610
1611                 if (tbl->action == start_action)
1612                         break;
1613         }
1614         search_tbl->lq_type = LQ_NONE;
1615         return 0;
1616
1617  out:
1618         lq_sta->search_better_tbl = 1;
1619         tbl->action++;
1620         if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1621                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1622         return 0;
1623 }
1624
1625 /*
1626  * Try to switch to new modulation mode from MIMO2
1627  */
1628 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1629                                  struct iwl_lq_sta *lq_sta,
1630                                  struct ieee80211_conf *conf,
1631                                  struct ieee80211_sta *sta, int index)
1632 {
1633         s8 is_green = lq_sta->is_green;
1634         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1635         struct iwl_scale_tbl_info *search_tbl =
1636                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1637         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1638         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1639                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1640         u8 start_action = tbl->action;
1641         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1642         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1643         int ret;
1644
1645         for (;;) {
1646                 lq_sta->action_counter++;
1647                 switch (tbl->action) {
1648                 case IWL_MIMO2_SWITCH_ANTENNA1:
1649                 case IWL_MIMO2_SWITCH_ANTENNA2:
1650                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1651
1652                         if (tx_chains_num <= 2)
1653                                 break;
1654
1655                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1656                                 break;
1657
1658                         memcpy(search_tbl, tbl, sz);
1659                         if (rs_toggle_antenna(valid_tx_ant,
1660                                        &search_tbl->current_rate, search_tbl))
1661                                 goto out;
1662                         break;
1663                 case IWL_MIMO2_SWITCH_SISO_A:
1664                 case IWL_MIMO2_SWITCH_SISO_B:
1665                 case IWL_MIMO2_SWITCH_SISO_C:
1666                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1667
1668                         /* Set up new search table for SISO */
1669                         memcpy(search_tbl, tbl, sz);
1670
1671                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1672                                 search_tbl->ant_type = ANT_A;
1673                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1674                                 search_tbl->ant_type = ANT_B;
1675                         else
1676                                 search_tbl->ant_type = ANT_C;
1677
1678                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1679                                 break;
1680
1681                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1682                                                  search_tbl, index);
1683                         if (!ret)
1684                                 goto out;
1685
1686                         break;
1687
1688                 case IWL_MIMO2_SWITCH_GI:
1689                         if (!tbl->is_fat &&
1690                                 !(priv->current_ht_config.sgf &
1691                                                 HT_SHORT_GI_20MHZ))
1692                                 break;
1693                         if (tbl->is_fat &&
1694                                 !(priv->current_ht_config.sgf &
1695                                                 HT_SHORT_GI_40MHZ))
1696                                 break;
1697
1698                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1699
1700                         /* Set up new search table for MIMO2 */
1701                         memcpy(search_tbl, tbl, sz);
1702                         search_tbl->is_SGI = !tbl->is_SGI;
1703                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1704                         /*
1705                          * If active table already uses the fastest possible
1706                          * modulation (dual stream with short guard interval),
1707                          * and it's working well, there's no need to look
1708                          * for a better type of modulation!
1709                          */
1710                         if (tbl->is_SGI) {
1711                                 s32 tpt = lq_sta->last_tpt / 100;
1712                                 if (tpt >= search_tbl->expected_tpt[index])
1713                                         break;
1714                         }
1715                         search_tbl->current_rate =
1716                                 rate_n_flags_from_tbl(priv, search_tbl,
1717                                                       index, is_green);
1718                         goto out;
1719
1720                 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1721                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1722                         memcpy(search_tbl, tbl, sz);
1723                         search_tbl->is_SGI = 0;
1724                         search_tbl->ant_type = ANT_ABC;
1725
1726                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1727                                 break;
1728
1729                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1730                                                  search_tbl, index);
1731                         if (!ret)
1732                                 goto out;
1733
1734                         break;
1735                 }
1736                 tbl->action++;
1737                 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1738                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1739
1740                 if (tbl->action == start_action)
1741                         break;
1742         }
1743         search_tbl->lq_type = LQ_NONE;
1744         return 0;
1745  out:
1746         lq_sta->search_better_tbl = 1;
1747         tbl->action++;
1748         if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1749                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1750         return 0;
1751
1752 }
1753
1754 /*
1755  * Try to switch to new modulation mode from MIMO3
1756  */
1757 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1758                                  struct iwl_lq_sta *lq_sta,
1759                                  struct ieee80211_conf *conf,
1760                                  struct ieee80211_sta *sta, int index)
1761 {
1762         s8 is_green = lq_sta->is_green;
1763         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1764         struct iwl_scale_tbl_info *search_tbl =
1765                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1766         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1767         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1768                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1769         u8 start_action = tbl->action;
1770         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1771         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1772         int ret;
1773
1774         for (;;) {
1775                 lq_sta->action_counter++;
1776                 switch (tbl->action) {
1777                 case IWL_MIMO3_SWITCH_ANTENNA1:
1778                 case IWL_MIMO3_SWITCH_ANTENNA2:
1779                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1780
1781                         if (tx_chains_num <= 3)
1782                                 break;
1783
1784                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1785                                 break;
1786
1787                         memcpy(search_tbl, tbl, sz);
1788                         if (rs_toggle_antenna(valid_tx_ant,
1789                                        &search_tbl->current_rate, search_tbl))
1790                                 goto out;
1791                         break;
1792                 case IWL_MIMO3_SWITCH_SISO_A:
1793                 case IWL_MIMO3_SWITCH_SISO_B:
1794                 case IWL_MIMO3_SWITCH_SISO_C:
1795                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1796
1797                         /* Set up new search table for SISO */
1798                         memcpy(search_tbl, tbl, sz);
1799
1800                         if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1801                                 search_tbl->ant_type = ANT_A;
1802                         else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1803                                 search_tbl->ant_type = ANT_B;
1804                         else
1805                                 search_tbl->ant_type = ANT_C;
1806
1807                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1808                                 break;
1809
1810                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1811                                                  search_tbl, index);
1812                         if (!ret)
1813                                 goto out;
1814
1815                         break;
1816
1817                 case IWL_MIMO3_SWITCH_MIMO2_AB:
1818                 case IWL_MIMO3_SWITCH_MIMO2_AC:
1819                 case IWL_MIMO3_SWITCH_MIMO2_BC:
1820                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1821
1822                         memcpy(search_tbl, tbl, sz);
1823                         search_tbl->is_SGI = 0;
1824                         if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1825                                 search_tbl->ant_type = ANT_AB;
1826                         else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1827                                 search_tbl->ant_type = ANT_AC;
1828                         else
1829                                 search_tbl->ant_type = ANT_BC;
1830
1831                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1832                                 break;
1833
1834                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1835                                                  search_tbl, index);
1836                         if (!ret)
1837                                 goto out;
1838
1839                         break;
1840
1841                 case IWL_MIMO3_SWITCH_GI:
1842                         if (!tbl->is_fat &&
1843                                 !(priv->current_ht_config.sgf &
1844                                                 HT_SHORT_GI_20MHZ))
1845                                 break;
1846                         if (tbl->is_fat &&
1847                                 !(priv->current_ht_config.sgf &
1848                                                 HT_SHORT_GI_40MHZ))
1849                                 break;
1850
1851                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1852
1853                         /* Set up new search table for MIMO */
1854                         memcpy(search_tbl, tbl, sz);
1855                         search_tbl->is_SGI = !tbl->is_SGI;
1856                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1857                         /*
1858                          * If active table already uses the fastest possible
1859                          * modulation (dual stream with short guard interval),
1860                          * and it's working well, there's no need to look
1861                          * for a better type of modulation!
1862                          */
1863                         if (tbl->is_SGI) {
1864                                 s32 tpt = lq_sta->last_tpt / 100;
1865                                 if (tpt >= search_tbl->expected_tpt[index])
1866                                         break;
1867                         }
1868                         search_tbl->current_rate =
1869                                 rate_n_flags_from_tbl(priv, search_tbl,
1870                                                       index, is_green);
1871                         goto out;
1872                 }
1873                 tbl->action++;
1874                 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1875                         tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1876
1877                 if (tbl->action == start_action)
1878                         break;
1879         }
1880         search_tbl->lq_type = LQ_NONE;
1881         return 0;
1882  out:
1883         lq_sta->search_better_tbl = 1;
1884         tbl->action++;
1885         if (tbl->action > IWL_MIMO3_SWITCH_GI)
1886                 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1887         return 0;
1888
1889 }
1890
1891 /*
1892  * Check whether we should continue using same modulation mode, or
1893  * begin search for a new mode, based on:
1894  * 1) # tx successes or failures while using this mode
1895  * 2) # times calling this function
1896  * 3) elapsed time in this mode (not used, for now)
1897  */
1898 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1899 {
1900         struct iwl_scale_tbl_info *tbl;
1901         int i;
1902         int active_tbl;
1903         int flush_interval_passed = 0;
1904         struct iwl_priv *priv;
1905
1906         priv = lq_sta->drv;
1907         active_tbl = lq_sta->active_tbl;
1908
1909         tbl = &(lq_sta->lq_info[active_tbl]);
1910
1911         /* If we've been disallowing search, see if we should now allow it */
1912         if (lq_sta->stay_in_tbl) {
1913
1914                 /* Elapsed time using current modulation mode */
1915                 if (lq_sta->flush_timer)
1916                         flush_interval_passed =
1917                             time_after(jiffies,
1918                                        (unsigned long)(lq_sta->flush_timer +
1919                                         IWL_RATE_SCALE_FLUSH_INTVL));
1920
1921                 /*
1922                  * Check if we should allow search for new modulation mode.
1923                  * If many frames have failed or succeeded, or we've used
1924                  * this same modulation for a long time, allow search, and
1925                  * reset history stats that keep track of whether we should
1926                  * allow a new search.  Also (below) reset all bitmaps and
1927                  * stats in active history.
1928                  */
1929                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1930                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1931                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1932                      && (flush_interval_passed))) {
1933                         IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
1934                                      lq_sta->total_failed,
1935                                      lq_sta->total_success,
1936                                      flush_interval_passed);
1937
1938                         /* Allow search for new mode */
1939                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1940                         lq_sta->total_failed = 0;
1941                         lq_sta->total_success = 0;
1942                         lq_sta->flush_timer = 0;
1943
1944                 /*
1945                  * Else if we've used this modulation mode enough repetitions
1946                  * (regardless of elapsed time or success/failure), reset
1947                  * history bitmaps and rate-specific stats for all rates in
1948                  * active table.
1949                  */
1950                 } else {
1951                         lq_sta->table_count++;
1952                         if (lq_sta->table_count >=
1953                             lq_sta->table_count_limit) {
1954                                 lq_sta->table_count = 0;
1955
1956                                 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
1957                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1958                                         rs_rate_scale_clear_window(
1959                                                 &(tbl->win[i]));
1960                         }
1961                 }
1962
1963                 /* If transitioning to allow "search", reset all history
1964                  * bitmaps and stats in active table (this will become the new
1965                  * "search" table). */
1966                 if (!lq_sta->stay_in_tbl) {
1967                         for (i = 0; i < IWL_RATE_COUNT; i++)
1968                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1969                 }
1970         }
1971 }
1972
1973 /*
1974  * Do rate scaling and search for new modulation mode.
1975  */
1976 static void rs_rate_scale_perform(struct iwl_priv *priv,
1977                                   struct ieee80211_hdr *hdr,
1978                                   struct ieee80211_sta *sta,
1979                                   struct iwl_lq_sta *lq_sta)
1980 {
1981         struct ieee80211_hw *hw = priv->hw;
1982         struct ieee80211_conf *conf = &hw->conf;
1983         int low = IWL_RATE_INVALID;
1984         int high = IWL_RATE_INVALID;
1985         int index;
1986         int i;
1987         struct iwl_rate_scale_data *window = NULL;
1988         int current_tpt = IWL_INVALID_VALUE;
1989         int low_tpt = IWL_INVALID_VALUE;
1990         int high_tpt = IWL_INVALID_VALUE;
1991         u32 fail_count;
1992         s8 scale_action = 0;
1993         u16 rate_mask;
1994         u8 update_lq = 0;
1995         struct iwl_scale_tbl_info *tbl, *tbl1;
1996         u16 rate_scale_index_msk = 0;
1997         u32 rate;
1998         u8 is_green = 0;
1999         u8 active_tbl = 0;
2000         u8 done_search = 0;
2001         u16 high_low;
2002         s32 sr;
2003         u8 tid = MAX_TID_COUNT;
2004         struct iwl_tid_data *tid_data;
2005
2006         IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2007
2008         /* Send management frames and broadcast/multicast data using
2009          * lowest rate. */
2010         /* TODO: this could probably be improved.. */
2011         if (!ieee80211_is_data(hdr->frame_control) ||
2012             is_multicast_ether_addr(hdr->addr1))
2013                 return;
2014
2015         if (!sta || !lq_sta)
2016                 return;
2017
2018         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2019
2020         tid = rs_tl_add_packet(lq_sta, hdr);
2021
2022         /*
2023          * Select rate-scale / modulation-mode table to work with in
2024          * the rest of this function:  "search" if searching for better
2025          * modulation mode, or "active" if doing rate scaling within a mode.
2026          */
2027         if (!lq_sta->search_better_tbl)
2028                 active_tbl = lq_sta->active_tbl;
2029         else
2030                 active_tbl = 1 - lq_sta->active_tbl;
2031
2032         tbl = &(lq_sta->lq_info[active_tbl]);
2033         is_green = lq_sta->is_green;
2034
2035         /* current tx rate */
2036         index = lq_sta->last_txrate_idx;
2037
2038         IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2039                        tbl->lq_type);
2040
2041         /* rates available for this association, and for modulation mode */
2042         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2043
2044         IWL_DEBUG_RATE(priv, "mask 0x%04X \n", rate_mask);
2045
2046         /* mask with station rate restriction */
2047         if (is_legacy(tbl->lq_type)) {
2048                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2049                         /* supp_rates has no CCK bits in A mode */
2050                         rate_scale_index_msk = (u16) (rate_mask &
2051                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2052                 else
2053                         rate_scale_index_msk = (u16) (rate_mask &
2054                                                       lq_sta->supp_rates);
2055
2056         } else
2057                 rate_scale_index_msk = rate_mask;
2058
2059         if (!rate_scale_index_msk)
2060                 rate_scale_index_msk = rate_mask;
2061
2062         if (!((1 << index) & rate_scale_index_msk)) {
2063                 IWL_ERR(priv, "Current Rate is not valid\n");
2064                 return;
2065         }
2066
2067         /* Get expected throughput table and history window for current rate */
2068         if (!tbl->expected_tpt) {
2069                 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2070                 return;
2071         }
2072
2073         /* force user max rate if set by user */
2074         if ((lq_sta->max_rate_idx != -1) &&
2075             (lq_sta->max_rate_idx < index)) {
2076                 index = lq_sta->max_rate_idx;
2077                 update_lq = 1;
2078                 window = &(tbl->win[index]);
2079                 goto lq_update;
2080         }
2081
2082         window = &(tbl->win[index]);
2083
2084         /*
2085          * If there is not enough history to calculate actual average
2086          * throughput, keep analyzing results of more tx frames, without
2087          * changing rate or mode (bypass most of the rest of this function).
2088          * Set up new rate table in uCode only if old rate is not supported
2089          * in current association (use new rate found above).
2090          */
2091         fail_count = window->counter - window->success_counter;
2092         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2093                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2094                 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2095                                "for index %d\n",
2096                                window->success_counter, window->counter, index);
2097
2098                 /* Can't calculate this yet; not enough history */
2099                 window->average_tpt = IWL_INVALID_VALUE;
2100
2101                 /* Should we stay with this modulation mode,
2102                  * or search for a new one? */
2103                 rs_stay_in_table(lq_sta);
2104
2105                 goto out;
2106         }
2107
2108         /* Else we have enough samples; calculate estimate of
2109          * actual average throughput */
2110
2111         BUG_ON(window->average_tpt != ((window->success_ratio *
2112                         tbl->expected_tpt[index] + 64) / 128));
2113
2114         /* If we are searching for better modulation mode, check success. */
2115         if (lq_sta->search_better_tbl) {
2116
2117                 /* If good success, continue using the "search" mode;
2118                  * no need to send new link quality command, since we're
2119                  * continuing to use the setup that we've been trying. */
2120                 if (window->average_tpt > lq_sta->last_tpt) {
2121
2122                         IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2123                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2124                                         window->success_ratio,
2125                                         window->average_tpt,
2126                                         lq_sta->last_tpt);
2127
2128                         if (!is_legacy(tbl->lq_type))
2129                                 lq_sta->enable_counter = 1;
2130
2131                         /* Swap tables; "search" becomes "active" */
2132                         lq_sta->active_tbl = active_tbl;
2133                         current_tpt = window->average_tpt;
2134
2135                 /* Else poor success; go back to mode in "active" table */
2136                 } else {
2137
2138                         IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2139                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2140                                         window->success_ratio,
2141                                         window->average_tpt,
2142                                         lq_sta->last_tpt);
2143
2144                         /* Nullify "search" table */
2145                         tbl->lq_type = LQ_NONE;
2146
2147                         /* Revert to "active" table */
2148                         active_tbl = lq_sta->active_tbl;
2149                         tbl = &(lq_sta->lq_info[active_tbl]);
2150
2151                         /* Revert to "active" rate and throughput info */
2152                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2153                         current_tpt = lq_sta->last_tpt;
2154
2155                         /* Need to set up a new rate table in uCode */
2156                         update_lq = 1;
2157                 }
2158
2159                 /* Either way, we've made a decision; modulation mode
2160                  * search is done, allow rate adjustment next time. */
2161                 lq_sta->search_better_tbl = 0;
2162                 done_search = 1;        /* Don't switch modes below! */
2163                 goto lq_update;
2164         }
2165
2166         /* (Else) not in search of better modulation mode, try for better
2167          * starting rate, while staying in this mode. */
2168         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2169                                         tbl->lq_type);
2170         low = high_low & 0xff;
2171         high = (high_low >> 8) & 0xff;
2172
2173         /* If user set max rate, dont allow higher than user constrain */
2174         if ((lq_sta->max_rate_idx != -1) &&
2175             (lq_sta->max_rate_idx < high))
2176                 high = IWL_RATE_INVALID;
2177
2178         sr = window->success_ratio;
2179
2180         /* Collect measured throughputs for current and adjacent rates */
2181         current_tpt = window->average_tpt;
2182         if (low != IWL_RATE_INVALID)
2183                 low_tpt = tbl->win[low].average_tpt;
2184         if (high != IWL_RATE_INVALID)
2185                 high_tpt = tbl->win[high].average_tpt;
2186
2187         scale_action = 0;
2188
2189         /* Too many failures, decrease rate */
2190         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2191                 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2192                 scale_action = -1;
2193
2194         /* No throughput measured yet for adjacent rates; try increase. */
2195         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2196                    (high_tpt == IWL_INVALID_VALUE)) {
2197
2198                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2199                         scale_action = 1;
2200                 else if (low != IWL_RATE_INVALID)
2201                         scale_action = 0;
2202         }
2203
2204         /* Both adjacent throughputs are measured, but neither one has better
2205          * throughput; we're using the best rate, don't change it! */
2206         else if ((low_tpt != IWL_INVALID_VALUE) &&
2207                  (high_tpt != IWL_INVALID_VALUE) &&
2208                  (low_tpt < current_tpt) &&
2209                  (high_tpt < current_tpt))
2210                 scale_action = 0;
2211
2212         /* At least one adjacent rate's throughput is measured,
2213          * and may have better performance. */
2214         else {
2215                 /* Higher adjacent rate's throughput is measured */
2216                 if (high_tpt != IWL_INVALID_VALUE) {
2217                         /* Higher rate has better throughput */
2218                         if (high_tpt > current_tpt &&
2219                                         sr >= IWL_RATE_INCREASE_TH) {
2220                                 scale_action = 1;
2221                         } else {
2222                                 scale_action = 0;
2223                         }
2224
2225                 /* Lower adjacent rate's throughput is measured */
2226                 } else if (low_tpt != IWL_INVALID_VALUE) {
2227                         /* Lower rate has better throughput */
2228                         if (low_tpt > current_tpt) {
2229                                 IWL_DEBUG_RATE(priv,
2230                                     "decrease rate because of low tpt\n");
2231                                 scale_action = -1;
2232                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2233                                 scale_action = 1;
2234                         }
2235                 }
2236         }
2237
2238         /* Sanity check; asked for decrease, but success rate or throughput
2239          * has been good at old rate.  Don't change it. */
2240         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2241                     ((sr > IWL_RATE_HIGH_TH) ||
2242                      (current_tpt > (100 * tbl->expected_tpt[low]))))
2243                 scale_action = 0;
2244
2245         switch (scale_action) {
2246         case -1:
2247                 /* Decrease starting rate, update uCode's rate table */
2248                 if (low != IWL_RATE_INVALID) {
2249                         update_lq = 1;
2250                         index = low;
2251                 }
2252                 break;
2253         case 1:
2254                 /* Increase starting rate, update uCode's rate table */
2255                 if (high != IWL_RATE_INVALID) {
2256                         update_lq = 1;
2257                         index = high;
2258                 }
2259
2260                 break;
2261         case 0:
2262                 /* No change */
2263         default:
2264                 break;
2265         }
2266
2267         IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2268                     "high %d type %d\n",
2269                      index, scale_action, low, high, tbl->lq_type);
2270
2271 lq_update:
2272         /* Replace uCode's rate table for the destination station. */
2273         if (update_lq) {
2274                 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2275                 rs_fill_link_cmd(priv, lq_sta, rate);
2276                 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2277         }
2278
2279         /* Should we stay with this modulation mode, or search for a new one? */
2280         rs_stay_in_table(lq_sta);
2281
2282         /*
2283          * Search for new modulation mode if we're:
2284          * 1)  Not changing rates right now
2285          * 2)  Not just finishing up a search
2286          * 3)  Allowing a new search
2287          */
2288         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2289                 /* Save current throughput to compare with "search" throughput*/
2290                 lq_sta->last_tpt = current_tpt;
2291
2292                 /* Select a new "search" modulation mode to try.
2293                  * If one is found, set up the new "search" table. */
2294                 if (is_legacy(tbl->lq_type))
2295                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2296                 else if (is_siso(tbl->lq_type))
2297                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2298                 else if (is_mimo2(tbl->lq_type))
2299                         rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2300                 else
2301                         rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2302
2303                 /* If new "search" mode was selected, set up in uCode table */
2304                 if (lq_sta->search_better_tbl) {
2305                         /* Access the "search" table, clear its history. */
2306                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2307                         for (i = 0; i < IWL_RATE_COUNT; i++)
2308                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2309
2310                         /* Use new "search" start rate */
2311                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2312
2313                         IWL_DEBUG_RATE(priv, "Switch current  mcs: %X index: %d\n",
2314                                      tbl->current_rate, index);
2315                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2316                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2317                 }
2318
2319                 /* If the "active" (non-search) mode was legacy,
2320                  * and we've tried switching antennas,
2321                  * but we haven't been able to try HT modes (not available),
2322                  * stay with best antenna legacy modulation for a while
2323                  * before next round of mode comparisons. */
2324                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2325                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2326                     lq_sta->action_counter >= 1) {
2327                         lq_sta->action_counter = 0;
2328                         IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2329                         rs_set_stay_in_table(priv, 1, lq_sta);
2330                 }
2331
2332                 /* If we're in an HT mode, and all 3 mode switch actions
2333                  * have been tried and compared, stay in this best modulation
2334                  * mode for a while before next round of mode comparisons. */
2335                 if (lq_sta->enable_counter &&
2336                     (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2337                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2338                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2339                             (tid != MAX_TID_COUNT)) {
2340                                 tid_data =
2341                                    &priv->stations[lq_sta->lq.sta_id].tid[tid];
2342                                 if (tid_data->agg.state == IWL_AGG_OFF) {
2343                                         IWL_DEBUG_RATE(priv,
2344                                                        "try to aggregate tid %d\n",
2345                                                        tid);
2346                                         rs_tl_turn_on_agg(priv, tid,
2347                                                           lq_sta, sta);
2348                                 }
2349                         }
2350                         lq_sta->action_counter = 0;
2351                         rs_set_stay_in_table(priv, 0, lq_sta);
2352                 }
2353
2354         /*
2355          * Else, don't search for a new modulation mode.
2356          * Put new timestamp in stay-in-modulation-mode flush timer if:
2357          * 1)  Not changing rates right now
2358          * 2)  Not just finishing up a search
2359          * 3)  flush timer is empty
2360          */
2361         } else {
2362                 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2363                         lq_sta->flush_timer = jiffies;
2364         }
2365
2366 out:
2367         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2368         i = index;
2369         lq_sta->last_txrate_idx = i;
2370
2371         return;
2372 }
2373
2374
2375 static void rs_initialize_lq(struct iwl_priv *priv,
2376                              struct ieee80211_conf *conf,
2377                              struct ieee80211_sta *sta,
2378                              struct iwl_lq_sta *lq_sta)
2379 {
2380         struct iwl_scale_tbl_info *tbl;
2381         int rate_idx;
2382         int i;
2383         u32 rate;
2384         u8 use_green = rs_use_green(priv, conf);
2385         u8 active_tbl = 0;
2386         u8 valid_tx_ant;
2387
2388         if (!sta || !lq_sta)
2389                 goto out;
2390
2391         i = lq_sta->last_txrate_idx;
2392
2393         if ((lq_sta->lq.sta_id == 0xff) &&
2394             (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2395                 goto out;
2396
2397         valid_tx_ant = priv->hw_params.valid_tx_ant;
2398
2399         if (!lq_sta->search_better_tbl)
2400                 active_tbl = lq_sta->active_tbl;
2401         else
2402                 active_tbl = 1 - lq_sta->active_tbl;
2403
2404         tbl = &(lq_sta->lq_info[active_tbl]);
2405
2406         if ((i < 0) || (i >= IWL_RATE_COUNT))
2407                 i = 0;
2408
2409         rate = iwl_rates[i].plcp;
2410         tbl->ant_type = first_antenna(valid_tx_ant);
2411         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2412
2413         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2414                 rate |= RATE_MCS_CCK_MSK;
2415
2416         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2417         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2418             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2419
2420         rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2421         tbl->current_rate = rate;
2422         rs_set_expected_tpt_table(lq_sta, tbl);
2423         rs_fill_link_cmd(NULL, lq_sta, rate);
2424         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2425  out:
2426         return;
2427 }
2428
2429 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2430                         struct ieee80211_tx_rate_control *txrc)
2431 {
2432
2433         struct sk_buff *skb = txrc->skb;
2434         struct ieee80211_supported_band *sband = txrc->sband;
2435         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2436         struct ieee80211_conf *conf = &priv->hw->conf;
2437         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2438         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2439         struct iwl_lq_sta *lq_sta = priv_sta;
2440         int rate_idx;
2441         u64 mask_bit = 0;
2442
2443         IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2444
2445         /* Get max rate if user set max rate */
2446         if (lq_sta) {
2447                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2448                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2449                     (lq_sta->max_rate_idx != -1))
2450                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2451                 if ((lq_sta->max_rate_idx < 0) ||
2452                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2453                         lq_sta->max_rate_idx = -1;
2454         }
2455
2456         if (sta)
2457                 mask_bit = sta->supp_rates[sband->band];
2458
2459         /* Send management frames and broadcast/multicast data using lowest
2460          * rate. */
2461         if (!ieee80211_is_data(hdr->frame_control) ||
2462             is_multicast_ether_addr(hdr->addr1) || !sta || !lq_sta) {
2463                 if (!mask_bit)
2464                         info->control.rates[0].idx =
2465                                         rate_lowest_index(sband, NULL);
2466                 else
2467                         info->control.rates[0].idx =
2468                                         rate_lowest_index(sband, sta);
2469                 return;
2470         }
2471
2472         rate_idx  = lq_sta->last_txrate_idx;
2473
2474         if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2475             !lq_sta->ibss_sta_added) {
2476                 u8 sta_id = priv->cfg->ops->smgmt->find_station(priv,
2477                                                    hdr->addr1);
2478
2479                 if (sta_id == IWL_INVALID_STATION) {
2480                         IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n",
2481                                        hdr->addr1);
2482                         sta_id = priv->cfg->ops->smgmt->add_station(priv,
2483                                                 hdr->addr1, 0,
2484                                                 CMD_ASYNC, NULL);
2485                 }
2486                 if ((sta_id != IWL_INVALID_STATION)) {
2487                         lq_sta->lq.sta_id = sta_id;
2488                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2489                         lq_sta->ibss_sta_added = 1;
2490                         rs_initialize_lq(priv, conf, sta, lq_sta);
2491                 }
2492         }
2493
2494         if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT)
2495                 rate_idx = rate_lowest_index(sband, sta);
2496         else if (sband->band == IEEE80211_BAND_5GHZ)
2497                 rate_idx -= IWL_FIRST_OFDM_RATE;
2498
2499         info->control.rates[0].idx = rate_idx;
2500 }
2501
2502 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2503                           gfp_t gfp)
2504 {
2505         struct iwl_lq_sta *lq_sta;
2506         struct iwl_priv *priv;
2507         int i, j;
2508
2509         priv = (struct iwl_priv *)priv_rate;
2510         IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2511
2512         lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2513
2514         if (lq_sta == NULL)
2515                 return NULL;
2516         lq_sta->lq.sta_id = 0xff;
2517
2518
2519         for (j = 0; j < LQ_SIZE; j++)
2520                 for (i = 0; i < IWL_RATE_COUNT; i++)
2521                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2522
2523         return lq_sta;
2524 }
2525
2526 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2527                          struct ieee80211_sta *sta, void *priv_sta)
2528 {
2529         int i, j;
2530         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2531         struct ieee80211_conf *conf = &priv->hw->conf;
2532         struct iwl_lq_sta *lq_sta = priv_sta;
2533         u16 mask_bit = 0;
2534         int count;
2535         int start_rate = 0;
2536
2537         lq_sta->flush_timer = 0;
2538         lq_sta->supp_rates = sta->supp_rates[sband->band];
2539         for (j = 0; j < LQ_SIZE; j++)
2540                 for (i = 0; i < IWL_RATE_COUNT; i++)
2541                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2542
2543         IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init ***\n");
2544         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2545          * the lowest or the highest rate.. Could consider using RSSI from
2546          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2547          * after assoc.. */
2548
2549         lq_sta->ibss_sta_added = 0;
2550         if (priv->iw_mode == NL80211_IFTYPE_AP) {
2551                 u8 sta_id = priv->cfg->ops->smgmt->find_station(priv,
2552                                                                 sta->addr);
2553
2554                 /* for IBSS the call are from tasklet */
2555                 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
2556
2557                 if (sta_id == IWL_INVALID_STATION) {
2558                         IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
2559                         sta_id = priv->cfg->ops->smgmt->add_station(priv,
2560                                                         sta->addr, 0,
2561                                                         CMD_ASYNC, NULL);
2562                 }
2563                 if ((sta_id != IWL_INVALID_STATION)) {
2564                         lq_sta->lq.sta_id = sta_id;
2565                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2566                 }
2567                 /* FIXME: this is w/a remove it later */
2568                 priv->assoc_station_added = 1;
2569         }
2570
2571         lq_sta->is_dup = 0;
2572         lq_sta->max_rate_idx = -1;
2573         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2574         lq_sta->is_green = rs_use_green(priv, conf);
2575         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2576         lq_sta->active_rate_basic = priv->active_rate_basic;
2577         lq_sta->band = priv->band;
2578         /*
2579          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2580          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2581          */
2582         lq_sta->active_siso_rate = sta->ht_cap.mcs.rx_mask[0] << 1;
2583         lq_sta->active_siso_rate |= sta->ht_cap.mcs.rx_mask[0] & 0x1;
2584         lq_sta->active_siso_rate &= ~((u16)0x2);
2585         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2586
2587         /* Same here */
2588         lq_sta->active_mimo2_rate = sta->ht_cap.mcs.rx_mask[1] << 1;
2589         lq_sta->active_mimo2_rate |= sta->ht_cap.mcs.rx_mask[1] & 0x1;
2590         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2591         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2592
2593         lq_sta->active_mimo3_rate = sta->ht_cap.mcs.rx_mask[2] << 1;
2594         lq_sta->active_mimo3_rate |= sta->ht_cap.mcs.rx_mask[2] & 0x1;
2595         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2596         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2597
2598         IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2599                      lq_sta->active_siso_rate,
2600                      lq_sta->active_mimo2_rate,
2601                      lq_sta->active_mimo3_rate);
2602
2603         /* These values will be overridden later */
2604         lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2605         lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2606
2607         /* as default allow aggregation for all tids */
2608         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2609         lq_sta->drv = priv;
2610
2611         /* Find highest tx rate supported by hardware and destination station */
2612         mask_bit = sta->supp_rates[sband->band];
2613         count = sband->n_bitrates;
2614         if (sband->band == IEEE80211_BAND_5GHZ) {
2615                 count += IWL_FIRST_OFDM_RATE;
2616                 start_rate = IWL_FIRST_OFDM_RATE;
2617                 mask_bit <<= IWL_FIRST_OFDM_RATE;
2618         }
2619
2620         mask_bit = mask_bit & lq_sta->active_legacy_rate;
2621         lq_sta->last_txrate_idx = 4;
2622         for (i = start_rate; i < count; i++)
2623                 if (mask_bit & BIT(i))
2624                         lq_sta->last_txrate_idx = i;
2625
2626         rs_initialize_lq(priv, conf, sta, lq_sta);
2627 }
2628
2629 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2630                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2631 {
2632         struct iwl_scale_tbl_info tbl_type;
2633         int index = 0;
2634         int rate_idx;
2635         int repeat_rate = 0;
2636         u8 ant_toggle_cnt = 0;
2637         u8 use_ht_possible = 1;
2638         u8 valid_tx_ant = 0;
2639         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2640
2641         /* Override starting rate (index 0) if needed for debug purposes */
2642         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2643
2644         /* Interpret new_rate (rate_n_flags) */
2645         memset(&tbl_type, 0, sizeof(tbl_type));
2646         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2647                                   &tbl_type, &rate_idx);
2648
2649         /* How many times should we repeat the initial rate? */
2650         if (is_legacy(tbl_type.lq_type)) {
2651                 ant_toggle_cnt = 1;
2652                 repeat_rate = IWL_NUMBER_TRY;
2653         } else {
2654                 repeat_rate = IWL_HT_NUMBER_TRY;
2655         }
2656
2657         lq_cmd->general_params.mimo_delimiter =
2658                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2659
2660         /* Fill 1st table entry (index 0) */
2661         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2662
2663         if (num_of_ant(tbl_type.ant_type) == 1) {
2664                 lq_cmd->general_params.single_stream_ant_msk =
2665                                                 tbl_type.ant_type;
2666         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2667                 lq_cmd->general_params.dual_stream_ant_msk =
2668                                                 tbl_type.ant_type;
2669         } /* otherwise we don't modify the existing value */
2670
2671         index++;
2672         repeat_rate--;
2673
2674         if (priv)
2675                 valid_tx_ant = priv->hw_params.valid_tx_ant;
2676
2677         /* Fill rest of rate table */
2678         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2679                 /* Repeat initial/next rate.
2680                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2681                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2682                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2683                         if (is_legacy(tbl_type.lq_type)) {
2684                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2685                                         ant_toggle_cnt++;
2686                                 else if (priv &&
2687                                          rs_toggle_antenna(valid_tx_ant,
2688                                                         &new_rate, &tbl_type))
2689                                         ant_toggle_cnt = 1;
2690 }
2691
2692                         /* Override next rate if needed for debug purposes */
2693                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2694
2695                         /* Fill next table entry */
2696                         lq_cmd->rs_table[index].rate_n_flags =
2697                                         cpu_to_le32(new_rate);
2698                         repeat_rate--;
2699                         index++;
2700                 }
2701
2702                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2703                                                 &rate_idx);
2704
2705                 /* Indicate to uCode which entries might be MIMO.
2706                  * If initial rate was MIMO, this will finally end up
2707                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2708                 if (is_mimo(tbl_type.lq_type))
2709                         lq_cmd->general_params.mimo_delimiter = index;
2710
2711                 /* Get next rate */
2712                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2713                                              use_ht_possible);
2714
2715                 /* How many times should we repeat the next rate? */
2716                 if (is_legacy(tbl_type.lq_type)) {
2717                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2718                                 ant_toggle_cnt++;
2719                         else if (priv &&
2720                                  rs_toggle_antenna(valid_tx_ant,
2721                                                    &new_rate, &tbl_type))
2722                                 ant_toggle_cnt = 1;
2723
2724                         repeat_rate = IWL_NUMBER_TRY;
2725                 } else {
2726                         repeat_rate = IWL_HT_NUMBER_TRY;
2727                 }
2728
2729                 /* Don't allow HT rates after next pass.
2730                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2731                 use_ht_possible = 0;
2732
2733                 /* Override next rate if needed for debug purposes */
2734                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2735
2736                 /* Fill next table entry */
2737                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2738
2739                 index++;
2740                 repeat_rate--;
2741         }
2742
2743         lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2744         lq_cmd->agg_params.agg_dis_start_th = 3;
2745         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2746 }
2747
2748 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2749 {
2750         return hw->priv;
2751 }
2752 /* rate scale requires free function to be implemented */
2753 static void rs_free(void *priv_rate)
2754 {
2755         return;
2756 }
2757
2758 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2759                         void *priv_sta)
2760 {
2761         struct iwl_lq_sta *lq_sta = priv_sta;
2762         struct iwl_priv *priv __maybe_unused = priv_r;
2763
2764         IWL_DEBUG_RATE(priv, "enter\n");
2765         kfree(lq_sta);
2766         IWL_DEBUG_RATE(priv, "leave\n");
2767 }
2768
2769
2770 #ifdef CONFIG_MAC80211_DEBUGFS
2771 static int open_file_generic(struct inode *inode, struct file *file)
2772 {
2773         file->private_data = inode->i_private;
2774         return 0;
2775 }
2776 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2777                              u32 *rate_n_flags, int index)
2778 {
2779         struct iwl_priv *priv;
2780         u8 valid_tx_ant;
2781         u8 ant_sel_tx;
2782
2783         priv = lq_sta->drv;
2784         valid_tx_ant = priv->hw_params.valid_tx_ant;
2785         if (lq_sta->dbg_fixed_rate) {
2786                 ant_sel_tx =
2787                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2788                   >> RATE_MCS_ANT_POS);
2789                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2790                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2791                         IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
2792                 } else {
2793                         lq_sta->dbg_fixed_rate = 0;
2794                         IWL_ERR(priv,
2795                             "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2796                             ant_sel_tx, valid_tx_ant);
2797                         IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2798                 }
2799         } else {
2800                 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2801         }
2802 }
2803
2804 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2805                         const char __user *user_buf, size_t count, loff_t *ppos)
2806 {
2807         struct iwl_lq_sta *lq_sta = file->private_data;
2808         struct iwl_priv *priv;
2809         char buf[64];
2810         int buf_size;
2811         u32 parsed_rate;
2812
2813         priv = lq_sta->drv;
2814         memset(buf, 0, sizeof(buf));
2815         buf_size = min(count, sizeof(buf) -  1);
2816         if (copy_from_user(buf, user_buf, buf_size))
2817                 return -EFAULT;
2818
2819         if (sscanf(buf, "%x", &parsed_rate) == 1)
2820                 lq_sta->dbg_fixed_rate = parsed_rate;
2821         else
2822                 lq_sta->dbg_fixed_rate = 0;
2823
2824         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2825         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2826         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2827         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2828
2829         IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
2830                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2831
2832         if (lq_sta->dbg_fixed_rate) {
2833                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2834                 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2835         }
2836
2837         return count;
2838 }
2839
2840 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2841                         char __user *user_buf, size_t count, loff_t *ppos)
2842 {
2843         char *buff;
2844         int desc = 0;
2845         int i = 0;
2846         int index = 0;
2847         ssize_t ret;
2848
2849         struct iwl_lq_sta *lq_sta = file->private_data;
2850         struct iwl_priv *priv;
2851         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2852
2853         priv = lq_sta->drv;
2854         buff = kmalloc(1024, GFP_KERNEL);
2855         if (!buff)
2856                 return -ENOMEM;
2857
2858         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2859         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2860                         lq_sta->total_failed, lq_sta->total_success,
2861                         lq_sta->active_legacy_rate);
2862         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2863                         lq_sta->dbg_fixed_rate);
2864         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2865             (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2866             (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2867             (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2868         desc += sprintf(buff+desc, "lq type %s\n",
2869            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2870         if (is_Ht(tbl->lq_type)) {
2871                 desc += sprintf(buff+desc, " %s",
2872                    (is_siso(tbl->lq_type)) ? "SISO" :
2873                    ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2874                    desc += sprintf(buff+desc, " %s",
2875                    (tbl->is_fat) ? "40MHz" : "20MHz");
2876                 desc += sprintf(buff+desc, " %s\n", (tbl->is_SGI) ? "SGI" : "");
2877         }
2878         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2879                 lq_sta->last_rate_n_flags);
2880         desc += sprintf(buff+desc, "general:"
2881                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2882                 lq_sta->lq.general_params.flags,
2883                 lq_sta->lq.general_params.mimo_delimiter,
2884                 lq_sta->lq.general_params.single_stream_ant_msk,
2885                 lq_sta->lq.general_params.dual_stream_ant_msk);
2886
2887         desc += sprintf(buff+desc, "agg:"
2888                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2889                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2890                         lq_sta->lq.agg_params.agg_dis_start_th,
2891                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2892
2893         desc += sprintf(buff+desc,
2894                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2895                         lq_sta->lq.general_params.start_rate_index[0],
2896                         lq_sta->lq.general_params.start_rate_index[1],
2897                         lq_sta->lq.general_params.start_rate_index[2],
2898                         lq_sta->lq.general_params.start_rate_index[3]);
2899
2900         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2901                 index = iwl_hwrate_to_plcp_idx(
2902                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2903                 if (is_legacy(tbl->lq_type)) {
2904                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2905                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2906                                 iwl_rate_mcs[index].mbps);
2907                 } else {
2908                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
2909                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2910                                 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
2911                 }
2912         }
2913
2914         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2915         kfree(buff);
2916         return ret;
2917 }
2918
2919 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2920         .write = rs_sta_dbgfs_scale_table_write,
2921         .read = rs_sta_dbgfs_scale_table_read,
2922         .open = open_file_generic,
2923 };
2924 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2925                         char __user *user_buf, size_t count, loff_t *ppos)
2926 {
2927         char *buff;
2928         int desc = 0;
2929         int i, j;
2930         ssize_t ret;
2931
2932         struct iwl_lq_sta *lq_sta = file->private_data;
2933
2934         buff = kmalloc(1024, GFP_KERNEL);
2935         if (!buff)
2936                 return -ENOMEM;
2937
2938         for (i = 0; i < LQ_SIZE; i++) {
2939                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2940                                 "rate=0x%X\n",
2941                                 lq_sta->active_tbl == i ? "*" : "x",
2942                                 lq_sta->lq_info[i].lq_type,
2943                                 lq_sta->lq_info[i].is_SGI,
2944                                 lq_sta->lq_info[i].is_fat,
2945                                 lq_sta->lq_info[i].is_dup,
2946                                 lq_sta->lq_info[i].current_rate);
2947                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2948                         desc += sprintf(buff+desc,
2949                                 "counter=%d success=%d %%=%d\n",
2950                                 lq_sta->lq_info[i].win[j].counter,
2951                                 lq_sta->lq_info[i].win[j].success_counter,
2952                                 lq_sta->lq_info[i].win[j].success_ratio);
2953                 }
2954         }
2955         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2956         kfree(buff);
2957         return ret;
2958 }
2959
2960 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2961         .read = rs_sta_dbgfs_stats_table_read,
2962         .open = open_file_generic,
2963 };
2964
2965 static void rs_add_debugfs(void *priv, void *priv_sta,
2966                                         struct dentry *dir)
2967 {
2968         struct iwl_lq_sta *lq_sta = priv_sta;
2969         lq_sta->rs_sta_dbgfs_scale_table_file =
2970                 debugfs_create_file("rate_scale_table", 0600, dir,
2971                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2972         lq_sta->rs_sta_dbgfs_stats_table_file =
2973                 debugfs_create_file("rate_stats_table", 0600, dir,
2974                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2975         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2976                 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2977                 &lq_sta->tx_agg_tid_en);
2978
2979 }
2980
2981 static void rs_remove_debugfs(void *priv, void *priv_sta)
2982 {
2983         struct iwl_lq_sta *lq_sta = priv_sta;
2984         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2985         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2986         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2987 }
2988 #endif
2989
2990 static struct rate_control_ops rs_ops = {
2991         .module = NULL,
2992         .name = RS_NAME,
2993         .tx_status = rs_tx_status,
2994         .get_rate = rs_get_rate,
2995         .rate_init = rs_rate_init,
2996         .alloc = rs_alloc,
2997         .free = rs_free,
2998         .alloc_sta = rs_alloc_sta,
2999         .free_sta = rs_free_sta,
3000 #ifdef CONFIG_MAC80211_DEBUGFS
3001         .add_sta_debugfs = rs_add_debugfs,
3002         .remove_sta_debugfs = rs_remove_debugfs,
3003 #endif
3004 };
3005
3006 int iwlagn_rate_control_register(void)
3007 {
3008         return ieee80211_rate_control_register(&rs_ops);
3009 }
3010
3011 void iwlagn_rate_control_unregister(void)
3012 {
3013         ieee80211_rate_control_unregister(&rs_ops);
3014 }
3015