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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  * James P. Ketrenos <ipw2100-admin@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/wireless.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37
  38 #include "iwl-dev.h"
  39 #include "iwl-sta.h"
  40 #include "iwl-core.h"
  41 #include "iwl-helpers.h"
  42
  43 #define RS_NAME "iwl-agn-rs"
  44
  45 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  46 #define IWL_NUMBER_TRY      1
  47 #define IWL_HT_NUMBER_TRY   3
  48
  49 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  50 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  51 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  52
  53 /* max time to accum history 2 seconds */
  54 #define IWL_RATE_SCALE_FLUSH_INTVL   (2*HZ)
  55
  56 static u8 rs_ht_to_legacy[] = {
  57         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  58         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  59         IWL_RATE_6M_INDEX,
  60         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  61         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  62         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  63         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  64 };
  65
  66 static const u8 ant_toggle_lookup[] = {
  67         /*ANT_NONE -> */ ANT_NONE,
  68         /*ANT_A    -> */ ANT_B,
  69         /*ANT_B    -> */ ANT_C,
  70         /*ANT_AB   -> */ ANT_BC,
  71         /*ANT_C    -> */ ANT_A,
  72         /*ANT_AC   -> */ ANT_AB,
  73         /*ANT_BC   -> */ ANT_AC,
  74         /*ANT_ABC  -> */ ANT_ABC,
  75 };
  76
  77 /**
  78  * struct iwl_rate_scale_data -- tx success history for one rate
  79  */
  80 struct iwl_rate_scale_data {
  81         u64 data;               /* bitmap of successful frames */
  82         s32 success_counter;    /* number of frames successful */
  83         s32 success_ratio;      /* per-cent * 128  */
  84         s32 counter;            /* number of frames attempted */
  85         s32 average_tpt;        /* success ratio * expected throughput */
  86         unsigned long stamp;
  87 };
  88
  89 /**
  90  * struct iwl_scale_tbl_info -- tx params and success history for all rates
  91  *
  92  * There are two of these in struct iwl_lq_sta,
  93  * one for "active", and one for "search".
  94  */
  95 struct iwl_scale_tbl_info {
  96         enum iwl_table_type lq_type;
  97         u8 ant_type;
  98         u8 is_SGI;      /* 1 = short guard interval */
  99         u8 is_fat;      /* 1 = 40 MHz channel width */
 100         u8 is_dup;      /* 1 = duplicated data streams */
 101         u8 action;      /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
 102         s32 *expected_tpt;      /* throughput metrics; expected_tpt_G, etc. */
 103         u32 current_rate;  /* rate_n_flags, uCode API format */
 104         struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
 105 };
 106
 107 struct iwl_traffic_load {
 108         unsigned long time_stamp;       /* age of the oldest statistics */
 109         u32 packet_count[TID_QUEUE_MAX_SIZE];   /* packet count in this time
 110                                                  * slice */
 111         u32 total;                      /* total num of packets during the
 112                                          * last TID_MAX_TIME_DIFF */
 113         u8 queue_count;                 /* number of queues that has
 114                                          * been used since the last cleanup */
 115         u8 head;                        /* start of the circular buffer */
 116 };
 117
 118 /**
 119  * struct iwl_lq_sta -- driver's rate scaling private structure
 120  *
 121  * Pointer to this gets passed back and forth between driver and mac80211.
 122  */
 123 struct iwl_lq_sta {
 124         u8 active_tbl;          /* index of active table, range 0-1 */
 125         u8 enable_counter;      /* indicates HT mode */
 126         u8 stay_in_tbl;         /* 1: disallow, 0: allow search for new mode */
 127         u8 search_better_tbl;   /* 1: currently trying alternate mode */
 128         s32 last_tpt;
 129
 130         /* The following determine when to search for a new mode */
 131         u32 table_count_limit;
 132         u32 max_failure_limit;  /* # failed frames before new search */
 133         u32 max_success_limit;  /* # successful frames before new search */
 134         u32 table_count;
 135         u32 total_failed;       /* total failed frames, any/all rates */
 136         u32 total_success;      /* total successful frames, any/all rates */
 137         u32 flush_timer;        /* time staying in mode before new search */
 138
 139         u8 action_counter;      /* # mode-switch actions tried */
 140         u8 is_green;
 141         u8 is_dup;
 142         enum ieee80211_band band;
 143         u8 ibss_sta_added;
 144
 145         /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
 146         u32 supp_rates;
 147         u16 active_legacy_rate;
 148         u16 active_siso_rate;
 149         u16 active_mimo2_rate;
 150         u16 active_mimo3_rate;
 151         u16 active_rate_basic;
 152
 153         struct iwl_link_quality_cmd lq;
 154         struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
 155         struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
 156         u8 tx_agg_tid_en;
 157 #ifdef CONFIG_MAC80211_DEBUGFS
 158         struct dentry *rs_sta_dbgfs_scale_table_file;
 159         struct dentry *rs_sta_dbgfs_stats_table_file;
 160         struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
 161         u32 dbg_fixed_rate;
 162 #endif
 163         struct iwl_priv *drv;
 164
 165         /* used to be in sta_info */
 166         int last_txrate_idx;
 167 };
 168
 169 static void rs_rate_scale_perform(struct iwl_priv *priv,
 170                                    struct ieee80211_hdr *hdr,
 171                                    struct ieee80211_sta *sta,
 172                                    struct iwl_lq_sta *lq_sta);
 173 static void rs_fill_link_cmd(const struct iwl_priv *priv,
 174                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 175
 176
 177 #ifdef CONFIG_MAC80211_DEBUGFS
 178 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 179                              u32 *rate_n_flags, int index);
 180 #else
 181 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 182                              u32 *rate_n_flags, int index)
 183 {}
 184 #endif
 185
 186 /*
 187  * Expected throughput metrics for following rates:
 188  * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 189  * "G" is the only table that supports CCK (the first 4 rates).
 190  */
 191 /*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/
 192 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
 193         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
 194 };
 195
 196 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
 197         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
 198 };
 199
 200 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
 201         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
 202 };
 203
 204 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
 205         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
 206 };
 207
 208 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
 209         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
 210 };
 211
 212 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
 213         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
 214 };
 215
 216 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
 217         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
 218 };
 219
 220 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
 221         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
 222 };
 223
 224 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
 225         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
 226 };
 227
 228 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
 229         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
 230 };
 231
 232 static inline u8 rs_extract_rate(u32 rate_n_flags)
 233 {
 234         return (u8)(rate_n_flags & 0xFF);
 235 }
 236
 237 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 238 {
 239         window->data = 0;
 240         window->success_counter = 0;
 241         window->success_ratio = IWL_INVALID_VALUE;
 242         window->counter = 0;
 243         window->average_tpt = IWL_INVALID_VALUE;
 244         window->stamp = 0;
 245 }
 246
 247 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 248 {
 249         return (ant_type & valid_antenna) == ant_type;
 250 }
 251
 252 /*
 253  *      removes the old data from the statistics. All data that is older than
 254  *      TID_MAX_TIME_DIFF, will be deleted.
 255  */
 256 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 257 {
 258         /* The oldest age we want to keep */
 259         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 260
 261         while (tl->queue_count &&
 262                (tl->time_stamp < oldest_time)) {
 263                 tl->total -= tl->packet_count[tl->head];
 264                 tl->packet_count[tl->head] = 0;
 265                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 266                 tl->queue_count--;
 267                 tl->head++;
 268                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 269                         tl->head = 0;
 270         }
 271 }
 272
 273 /*
 274  *      increment traffic load value for tid and also remove
 275  *      any old values if passed the certain time period
 276  */
 277 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 278                            struct ieee80211_hdr *hdr)
 279 {
 280         u32 curr_time = jiffies_to_msecs(jiffies);
 281         u32 time_diff;
 282         s32 index;
 283         struct iwl_traffic_load *tl = NULL;
 284         __le16 fc = hdr->frame_control;
 285         u8 tid;
 286
 287         if (ieee80211_is_data_qos(fc)) {
 288                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 289                 tid = qc[0] & 0xf;
 290         } else
 291                 return MAX_TID_COUNT;
 292
 293         tl = &lq_data->load[tid];
 294
 295         curr_time -= curr_time % TID_ROUND_VALUE;
 296
 297         /* Happens only for the first packet. Initialize the data */
 298         if (!(tl->queue_count)) {
 299                 tl->total = 1;
 300                 tl->time_stamp = curr_time;
 301                 tl->queue_count = 1;
 302                 tl->head = 0;
 303                 tl->packet_count[0] = 1;
 304                 return MAX_TID_COUNT;
 305         }
 306
 307         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 308         index = time_diff / TID_QUEUE_CELL_SPACING;
 309
 310         /* The history is too long: remove data that is older than */
 311         /* TID_MAX_TIME_DIFF */
 312         if (index >= TID_QUEUE_MAX_SIZE)
 313                 rs_tl_rm_old_stats(tl, curr_time);
 314
 315         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 316         tl->packet_count[index] = tl->packet_count[index] + 1;
 317         tl->total = tl->total + 1;
 318
 319         if ((index + 1) > tl->queue_count)
 320                 tl->queue_count = index + 1;
 321
 322         return tid;
 323 }
 324
 325 /*
 326         get the traffic load value for tid
 327 */
 328 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 329 {
 330         u32 curr_time = jiffies_to_msecs(jiffies);
 331         u32 time_diff;
 332         s32 index;
 333         struct iwl_traffic_load *tl = NULL;
 334
 335         if (tid >= TID_MAX_LOAD_COUNT)
 336                 return 0;
 337
 338         tl = &(lq_data->load[tid]);
 339
 340         curr_time -= curr_time % TID_ROUND_VALUE;
 341
 342         if (!(tl->queue_count))
 343                 return 0;
 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         return tl->total;
 354 }
 355
 356 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 357                                       struct iwl_lq_sta *lq_data, u8 tid,
 358                                       struct ieee80211_sta *sta)
 359 {
 360         DECLARE_MAC_BUF(mac);
 361
 362         if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
 363                 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
 364                                 print_mac(mac, sta->addr), tid);
 365                 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
 366         }
 367 }
 368
 369 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 370                               struct iwl_lq_sta *lq_data,
 371                               struct ieee80211_sta *sta)
 372 {
 373         if ((tid < TID_MAX_LOAD_COUNT))
 374                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 375         else if (tid == IWL_AGG_ALL_TID)
 376                 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
 377                         rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 378 }
 379
 380 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 381 {
 382         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 383                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 384                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 385 }
 386
 387 /**
 388  * rs_collect_tx_data - Update the success/failure sliding window
 389  *
 390  * We keep a sliding window of the last 62 packets transmitted
 391  * at this rate.  window->data contains the bitmask of successful
 392  * packets.
 393  */
 394 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
 395                               int scale_index, s32 tpt, int retries,
 396                               int successes)
 397 {
 398         struct iwl_rate_scale_data *window = NULL;
 399         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 400         s32 fail_count;
 401
 402         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 403                 return -EINVAL;
 404
 405         /* Select data for current tx bit rate */
 406         window = &(windows[scale_index]);
 407
 408         /*
 409          * Keep track of only the latest 62 tx frame attempts in this rate's
 410          * history window; anything older isn't really relevant any more.
 411          * If we have filled up the sliding window, drop the oldest attempt;
 412          * if the oldest attempt (highest bit in bitmap) shows "success",
 413          * subtract "1" from the success counter (this is the main reason
 414          * we keep these bitmaps!).
 415          */
 416         while (retries > 0) {
 417                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 418
 419                         /* remove earliest */
 420                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 421
 422                         if (window->data & mask) {
 423                                 window->data &= ~mask;
 424                                 window->success_counter--;
 425                         }
 426                 }
 427
 428                 /* Increment frames-attempted counter */
 429                 window->counter++;
 430
 431                 /* Shift bitmap by one frame (throw away oldest history),
 432                  * OR in "1", and increment "success" if this
 433                  * frame was successful. */
 434                 window->data <<= 1;
 435                 if (successes > 0) {
 436                         window->success_counter++;
 437                         window->data |= 0x1;
 438                         successes--;
 439                 }
 440
 441                 retries--;
 442         }
 443
 444         /* Calculate current success ratio, avoid divide-by-0! */
 445         if (window->counter > 0)
 446                 window->success_ratio = 128 * (100 * window->success_counter)
 447                                         / window->counter;
 448         else
 449                 window->success_ratio = IWL_INVALID_VALUE;
 450
 451         fail_count = window->counter - window->success_counter;
 452
 453         /* Calculate average throughput, if we have enough history. */
 454         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 455             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 456                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 457         else
 458                 window->average_tpt = IWL_INVALID_VALUE;
 459
 460         /* Tag this window as having been updated */
 461         window->stamp = jiffies;
 462
 463         return 0;
 464 }
 465
 466 /*
 467  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 468  */
 469 /* FIXME:RS:remove this function and put the flags statically in the table */
 470 static u32 rate_n_flags_from_tbl(struct iwl_scale_tbl_info *tbl,
 471                                        int index, u8 use_green)
 472 {
 473         u32 rate_n_flags = 0;
 474
 475         if (is_legacy(tbl->lq_type)) {
 476                 rate_n_flags = iwl_rates[index].plcp;
 477                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 478                         rate_n_flags |= RATE_MCS_CCK_MSK;
 479
 480         } else if (is_Ht(tbl->lq_type)) {
 481                 if (index > IWL_LAST_OFDM_RATE) {
 482                         IWL_ERROR("invalid HT rate index %d\n", index);
 483                         index = IWL_LAST_OFDM_RATE;
 484                 }
 485                 rate_n_flags = RATE_MCS_HT_MSK;
 486
 487                 if (is_siso(tbl->lq_type))
 488                         rate_n_flags |= iwl_rates[index].plcp_siso;
 489                 else if (is_mimo2(tbl->lq_type))
 490                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 491                 else
 492                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 493         } else {
 494                 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
 495         }
 496
 497         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 498                                                      RATE_MCS_ANT_ABC_MSK);
 499
 500         if (is_Ht(tbl->lq_type)) {
 501                 if (tbl->is_fat) {
 502                         if (tbl->is_dup)
 503                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 504                         else
 505                                 rate_n_flags |= RATE_MCS_FAT_MSK;
 506                 }
 507                 if (tbl->is_SGI)
 508                         rate_n_flags |= RATE_MCS_SGI_MSK;
 509
 510                 if (use_green) {
 511                         rate_n_flags |= RATE_MCS_GF_MSK;
 512                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 513                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 514                                 IWL_ERROR("GF was set with SGI:SISO\n");
 515                         }
 516                 }
 517         }
 518         return rate_n_flags;
 519 }
 520
 521 /*
 522  * Interpret uCode API's rate_n_flags format,
 523  * fill "search" or "active" tx mode table.
 524  */
 525 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 526                                     enum ieee80211_band band,
 527                                     struct iwl_scale_tbl_info *tbl,
 528                                     int *rate_idx)
 529 {
 530         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 531         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 532         u8 mcs;
 533
 534         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 535
 536         if (*rate_idx  == IWL_RATE_INVALID) {
 537                 *rate_idx = -1;
 538                 return -EINVAL;
 539         }
 540         tbl->is_SGI = 0;        /* default legacy setup */
 541         tbl->is_fat = 0;
 542         tbl->is_dup = 0;
 543         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 544         tbl->lq_type = LQ_NONE;
 545
 546         /* legacy rate format */
 547         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 548                 if (num_of_ant == 1) {
 549                         if (band == IEEE80211_BAND_5GHZ)
 550                                 tbl->lq_type = LQ_A;
 551                         else
 552                                 tbl->lq_type = LQ_G;
 553                 }
 554         /* HT rate format */
 555         } else {
 556                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 557                         tbl->is_SGI = 1;
 558
 559                 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
 560                     (rate_n_flags & RATE_MCS_DUP_MSK))
 561                         tbl->is_fat = 1;
 562
 563                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 564                         tbl->is_dup = 1;
 565
 566                 mcs = rs_extract_rate(rate_n_flags);
 567
 568                 /* SISO */
 569                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 570                         if (num_of_ant == 1)
 571                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 572                 /* MIMO2 */
 573                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 574                         if (num_of_ant == 2)
 575                                 tbl->lq_type = LQ_MIMO2;
 576                 /* MIMO3 */
 577                 } else {
 578                         if (num_of_ant == 3)
 579                                 tbl->lq_type = LQ_MIMO3;
 580                 }
 581         }
 582         return 0;
 583 }
 584
 585 /* switch to another antenna/antennas and return 1 */
 586 /* if no other valid antenna found, return 0 */
 587 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 588                              struct iwl_scale_tbl_info *tbl)
 589 {
 590         u8 new_ant_type;
 591
 592         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 593                 return 0;
 594
 595         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 596                 return 0;
 597
 598         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 599
 600         while ((new_ant_type != tbl->ant_type) &&
 601                !rs_is_valid_ant(valid_ant, new_ant_type))
 602                 new_ant_type = ant_toggle_lookup[new_ant_type];
 603
 604         if (new_ant_type == tbl->ant_type)
 605                 return 0;
 606
 607         tbl->ant_type = new_ant_type;
 608         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 609         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 610         return 1;
 611 }
 612
 613 /* FIXME:RS: in 4965 we don't use greenfield at all */
 614 /* FIXME:RS: don't use greenfield for now in TX */
 615 #if 0
 616 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
 617 {
 618         return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
 619                 priv->current_ht_config.is_green_field &&
 620                 !priv->current_ht_config.non_GF_STA_present;
 621 }
 622 #endif
 623 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
 624 {
 625         return 0;
 626 }
 627
 628 /**
 629  * rs_get_supported_rates - get the available rates
 630  *
 631  * if management frame or broadcast frame only return
 632  * basic available rates.
 633  *
 634  */
 635 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 636                                   struct ieee80211_hdr *hdr,
 637                                   enum iwl_table_type rate_type)
 638 {
 639         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
 640             lq_sta->active_rate_basic)
 641                 return lq_sta->active_rate_basic;
 642
 643         if (is_legacy(rate_type)) {
 644                 return lq_sta->active_legacy_rate;
 645         } else {
 646                 if (is_siso(rate_type))
 647                         return lq_sta->active_siso_rate;
 648                 else if (is_mimo2(rate_type))
 649                         return lq_sta->active_mimo2_rate;
 650                 else
 651                         return lq_sta->active_mimo3_rate;
 652         }
 653 }
 654
 655 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 656                                 int rate_type)
 657 {
 658         u8 high = IWL_RATE_INVALID;
 659         u8 low = IWL_RATE_INVALID;
 660
 661         /* 802.11A or ht walks to the next literal adjacent rate in
 662          * the rate table */
 663         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 664                 int i;
 665                 u32 mask;
 666
 667                 /* Find the previous rate that is in the rate mask */
 668                 i = index - 1;
 669                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 670                         if (rate_mask & mask) {
 671                                 low = i;
 672                                 break;
 673                         }
 674                 }
 675
 676                 /* Find the next rate that is in the rate mask */
 677                 i = index + 1;
 678                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 679                         if (rate_mask & mask) {
 680                                 high = i;
 681                                 break;
 682                         }
 683                 }
 684
 685                 return (high << 8) | low;
 686         }
 687
 688         low = index;
 689         while (low != IWL_RATE_INVALID) {
 690                 low = iwl_rates[low].prev_rs;
 691                 if (low == IWL_RATE_INVALID)
 692                         break;
 693                 if (rate_mask & (1 << low))
 694                         break;
 695                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
 696         }
 697
 698         high = index;
 699         while (high != IWL_RATE_INVALID) {
 700                 high = iwl_rates[high].next_rs;
 701                 if (high == IWL_RATE_INVALID)
 702                         break;
 703                 if (rate_mask & (1 << high))
 704                         break;
 705                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
 706         }
 707
 708         return (high << 8) | low;
 709 }
 710
 711 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 712                              struct iwl_scale_tbl_info *tbl,
 713                              u8 scale_index, u8 ht_possible)
 714 {
 715         s32 low;
 716         u16 rate_mask;
 717         u16 high_low;
 718         u8 switch_to_legacy = 0;
 719         u8 is_green = lq_sta->is_green;
 720
 721         /* check if we need to switch from HT to legacy rates.
 722          * assumption is that mandatory rates (1Mbps or 6Mbps)
 723          * are always supported (spec demand) */
 724         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 725                 switch_to_legacy = 1;
 726                 scale_index = rs_ht_to_legacy[scale_index];
 727                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 728                         tbl->lq_type = LQ_A;
 729                 else
 730                         tbl->lq_type = LQ_G;
 731
 732                 if (num_of_ant(tbl->ant_type) > 1)
 733                         tbl->ant_type = ANT_A;/*FIXME:RS*/
 734
 735                 tbl->is_fat = 0;
 736                 tbl->is_SGI = 0;
 737         }
 738
 739         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 740
 741         /* Mask with station rate restriction */
 742         if (is_legacy(tbl->lq_type)) {
 743                 /* supp_rates has no CCK bits in A mode */
 744                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 745                         rate_mask  = (u16)(rate_mask &
 746                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 747                 else
 748                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 749         }
 750
 751         /* If we switched from HT to legacy, check current rate */
 752         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 753                 low = scale_index;
 754                 goto out;
 755         }
 756
 757         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 758                                         tbl->lq_type);
 759         low = high_low & 0xff;
 760
 761         if (low == IWL_RATE_INVALID)
 762                 low = scale_index;
 763
 764 out:
 765         return rate_n_flags_from_tbl(tbl, low, is_green);
 766 }
 767
 768 /*
 769  * mac80211 sends us Tx status
 770  */
 771 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 772                          struct ieee80211_sta *sta, void *priv_sta,
 773                          struct sk_buff *skb)
 774 {
 775         int status;
 776         u8 retries;
 777         int rs_index, index = 0;
 778         struct iwl_lq_sta *lq_sta;
 779         struct iwl_link_quality_cmd *table;
 780         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 781         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
 782         struct ieee80211_hw *hw = priv->hw;
 783         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 784         struct iwl_rate_scale_data *window = NULL;
 785         struct iwl_rate_scale_data *search_win = NULL;
 786         u32 tx_rate;
 787         struct iwl_scale_tbl_info tbl_type;
 788         struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
 789         u8 active_index = 0;
 790         __le16 fc = hdr->frame_control;
 791         s32 tpt = 0;
 792
 793         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
 794
 795         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
 796                 return;
 797
 798         /* This packet was aggregated but doesn't carry rate scale info */
 799         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 800             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 801                 return;
 802
 803         retries = info->status.retry_count;
 804
 805         if (retries > 15)
 806                 retries = 15;
 807
 808         lq_sta = (struct iwl_lq_sta *)priv_sta;
 809
 810         if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
 811             !lq_sta->ibss_sta_added)
 812                 goto out;
 813
 814         table = &lq_sta->lq;
 815         active_index = lq_sta->active_tbl;
 816
 817         curr_tbl = &(lq_sta->lq_info[active_index]);
 818         search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
 819         window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
 820         search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
 821
 822         /*
 823          * Ignore this Tx frame response if its initial rate doesn't match
 824          * that of latest Link Quality command.  There may be stragglers
 825          * from a previous Link Quality command, but we're no longer interested
 826          * in those; they're either from the "active" mode while we're trying
 827          * to check "search" mode, or a prior "search" mode after we've moved
 828          * to a new "search" mode (which might become the new "active" mode).
 829          */
 830         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 831         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 832         if (priv->band == IEEE80211_BAND_5GHZ)
 833                 rs_index -= IWL_FIRST_OFDM_RATE;
 834
 835         if ((info->tx_rate_idx < 0) ||
 836             (tbl_type.is_SGI ^
 837                 !!(info->flags & IEEE80211_TX_CTL_SHORT_GI)) ||
 838             (tbl_type.is_fat ^
 839                 !!(info->flags & IEEE80211_TX_CTL_40_MHZ_WIDTH)) ||
 840             (tbl_type.is_dup ^
 841                 !!(info->flags & IEEE80211_TX_CTL_DUP_DATA)) ||
 842             (tbl_type.ant_type ^ info->antenna_sel_tx) ||
 843             (!!(tx_rate & RATE_MCS_HT_MSK) ^
 844                 !!(info->flags & IEEE80211_TX_CTL_OFDM_HT)) ||
 845             (!!(tx_rate & RATE_MCS_GF_MSK) ^
 846                 !!(info->flags & IEEE80211_TX_CTL_GREEN_FIELD)) ||
 847             (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
 848              hw->wiphy->bands[info->band]->bitrates[info->tx_rate_idx].bitrate)) {
 849                 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
 850                 goto out;
 851         }
 852
 853         /* Update frame history window with "failure" for each Tx retry. */
 854         while (retries) {
 855                 /* Look up the rate and other info used for each tx attempt.
 856                  * Each tx attempt steps one entry deeper in the rate table. */
 857                 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 858                 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
 859                                           &tbl_type, &rs_index);
 860
 861                 /* If type matches "search" table,
 862                  * add failure to "search" history */
 863                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 864                     (tbl_type.ant_type == search_tbl->ant_type) &&
 865                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 866                         if (search_tbl->expected_tpt)
 867                                 tpt = search_tbl->expected_tpt[rs_index];
 868                         else
 869                                 tpt = 0;
 870                         rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
 871
 872                 /* Else if type matches "current/active" table,
 873                  * add failure to "current/active" history */
 874                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 875                            (tbl_type.ant_type == curr_tbl->ant_type) &&
 876                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 877                         if (curr_tbl->expected_tpt)
 878                                 tpt = curr_tbl->expected_tpt[rs_index];
 879                         else
 880                                 tpt = 0;
 881                         rs_collect_tx_data(window, rs_index, tpt, 1, 0);
 882                 }
 883
 884                 /* If not searching for a new mode, increment failed counter
 885                  * ... this helps determine when to start searching again */
 886                 if (lq_sta->stay_in_tbl)
 887                         lq_sta->total_failed++;
 888                 --retries;
 889                 index++;
 890
 891         }
 892
 893         /*
 894          * Find (by rate) the history window to update with final Tx attempt;
 895          * if Tx was successful first try, use original rate,
 896          * else look up the rate that was, finally, successful.
 897          */
 898         tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 899         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 900
 901         /* Update frame history window with "success" if Tx got ACKed ... */
 902         status = !!(info->flags & IEEE80211_TX_STAT_ACK);
 903
 904         /* If type matches "search" table,
 905          * add final tx status to "search" history */
 906         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 907             (tbl_type.ant_type == search_tbl->ant_type) &&
 908             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 909                 if (search_tbl->expected_tpt)
 910                         tpt = search_tbl->expected_tpt[rs_index];
 911                 else
 912                         tpt = 0;
 913                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 914                         rs_collect_tx_data(search_win, rs_index, tpt,
 915                                            info->status.ampdu_ack_len,
 916                                            info->status.ampdu_ack_map);
 917                 else
 918                         rs_collect_tx_data(search_win, rs_index, tpt,
 919                                            1, status);
 920         /* Else if type matches "current/active" table,
 921          * add final tx status to "current/active" history */
 922         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 923                    (tbl_type.ant_type == curr_tbl->ant_type) &&
 924                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 925                 if (curr_tbl->expected_tpt)
 926                         tpt = curr_tbl->expected_tpt[rs_index];
 927                 else
 928                         tpt = 0;
 929                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 930                         rs_collect_tx_data(window, rs_index, tpt,
 931                                            info->status.ampdu_ack_len,
 932                                            info->status.ampdu_ack_map);
 933                 else
 934                         rs_collect_tx_data(window, rs_index, tpt,
 935                                            1, status);
 936         }
 937
 938         /* If not searching for new mode, increment success/failed counter
 939          * ... these help determine when to start searching again */
 940         if (lq_sta->stay_in_tbl) {
 941                 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
 942                         lq_sta->total_success += info->status.ampdu_ack_map;
 943                         lq_sta->total_failed +=
 944                              (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
 945                 } else {
 946                         if (status)
 947                                 lq_sta->total_success++;
 948                         else
 949                                 lq_sta->total_failed++;
 950                 }
 951         }
 952
 953         /* See if there's a better rate or modulation mode to try. */
 954         rs_rate_scale_perform(priv, hdr, sta, lq_sta);
 955 out:
 956         return;
 957 }
 958
 959 /*
 960  * Begin a period of staying with a selected modulation mode.
 961  * Set "stay_in_tbl" flag to prevent any mode switches.
 962  * Set frame tx success limits according to legacy vs. high-throughput,
 963  * and reset overall (spanning all rates) tx success history statistics.
 964  * These control how long we stay using same modulation mode before
 965  * searching for a new mode.
 966  */
 967 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
 968                                  struct iwl_lq_sta *lq_sta)
 969 {
 970         IWL_DEBUG_RATE("we are staying in the same table\n");
 971         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
 972         if (is_legacy) {
 973                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
 974                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
 975                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
 976         } else {
 977                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
 978                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
 979                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
 980         }
 981         lq_sta->table_count = 0;
 982         lq_sta->total_failed = 0;
 983         lq_sta->total_success = 0;
 984 }
 985
 986 /*
 987  * Find correct throughput table for given mode of modulation
 988  */
 989 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
 990                                       struct iwl_scale_tbl_info *tbl)
 991 {
 992         if (is_legacy(tbl->lq_type)) {
 993                 if (!is_a_band(tbl->lq_type))
 994                         tbl->expected_tpt = expected_tpt_G;
 995                 else
 996                         tbl->expected_tpt = expected_tpt_A;
 997         } else if (is_siso(tbl->lq_type)) {
 998                 if (tbl->is_fat && !lq_sta->is_dup)
 999                         if (tbl->is_SGI)
1000                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1001                         else
1002                                 tbl->expected_tpt = expected_tpt_siso40MHz;
1003                 else if (tbl->is_SGI)
1004                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1005                 else
1006                         tbl->expected_tpt = expected_tpt_siso20MHz;
1007
1008         } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1009                 if (tbl->is_fat && !lq_sta->is_dup)
1010                         if (tbl->is_SGI)
1011                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1012                         else
1013                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
1014                 else if (tbl->is_SGI)
1015                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1016                 else
1017                         tbl->expected_tpt = expected_tpt_mimo20MHz;
1018         } else
1019                 tbl->expected_tpt = expected_tpt_G;
1020 }
1021
1022 /*
1023  * Find starting rate for new "search" high-throughput mode of modulation.
1024  * Goal is to find lowest expected rate (under perfect conditions) that is
1025  * above the current measured throughput of "active" mode, to give new mode
1026  * a fair chance to prove itself without too many challenges.
1027  *
1028  * This gets called when transitioning to more aggressive modulation
1029  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1030  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1031  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1032  * bit rate will typically need to increase, but not if performance was bad.
1033  */
1034 static s32 rs_get_best_rate(struct iwl_priv *priv,
1035                             struct iwl_lq_sta *lq_sta,
1036                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1037                             u16 rate_mask, s8 index)
1038 {
1039         /* "active" values */
1040         struct iwl_scale_tbl_info *active_tbl =
1041             &(lq_sta->lq_info[lq_sta->active_tbl]);
1042         s32 active_sr = active_tbl->win[index].success_ratio;
1043         s32 active_tpt = active_tbl->expected_tpt[index];
1044
1045         /* expected "search" throughput */
1046         s32 *tpt_tbl = tbl->expected_tpt;
1047
1048         s32 new_rate, high, low, start_hi;
1049         u16 high_low;
1050         s8 rate = index;
1051
1052         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1053
1054         for (; ;) {
1055                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1056                                                 tbl->lq_type);
1057
1058                 low = high_low & 0xff;
1059                 high = (high_low >> 8) & 0xff;
1060
1061                 /*
1062                  * Lower the "search" bit rate, to give new "search" mode
1063                  * approximately the same throughput as "active" if:
1064                  *
1065                  * 1) "Active" mode has been working modestly well (but not
1066                  *    great), and expected "search" throughput (under perfect
1067                  *    conditions) at candidate rate is above the actual
1068                  *    measured "active" throughput (but less than expected
1069                  *    "active" throughput under perfect conditions).
1070                  * OR
1071                  * 2) "Active" mode has been working perfectly or very well
1072                  *    and expected "search" throughput (under perfect
1073                  *    conditions) at candidate rate is above expected
1074                  *    "active" throughput (under perfect conditions).
1075                  */
1076                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1077                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1078                       (active_sr <= IWL_RATE_HIGH_TH) &&
1079                       (tpt_tbl[rate] <= active_tpt))) ||
1080                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1081                      (tpt_tbl[rate] > active_tpt))) {
1082
1083                         /* (2nd or later pass)
1084                          * If we've already tried to raise the rate, and are
1085                          * now trying to lower it, use the higher rate. */
1086                         if (start_hi != IWL_RATE_INVALID) {
1087                                 new_rate = start_hi;
1088                                 break;
1089                         }
1090
1091                         new_rate = rate;
1092
1093                         /* Loop again with lower rate */
1094                         if (low != IWL_RATE_INVALID)
1095                                 rate = low;
1096
1097                         /* Lower rate not available, use the original */
1098                         else
1099                                 break;
1100
1101                 /* Else try to raise the "search" rate to match "active" */
1102                 } else {
1103                         /* (2nd or later pass)
1104                          * If we've already tried to lower the rate, and are
1105                          * now trying to raise it, use the lower rate. */
1106                         if (new_rate != IWL_RATE_INVALID)
1107                                 break;
1108
1109                         /* Loop again with higher rate */
1110                         else if (high != IWL_RATE_INVALID) {
1111                                 start_hi = high;
1112                                 rate = high;
1113
1114                         /* Higher rate not available, use the original */
1115                         } else {
1116                                 new_rate = rate;
1117                                 break;
1118                         }
1119                 }
1120         }
1121
1122         return new_rate;
1123 }
1124
1125 /*
1126  * Set up search table for MIMO
1127  */
1128 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1129                              struct iwl_lq_sta *lq_sta,
1130                              struct ieee80211_conf *conf,
1131                              struct ieee80211_sta *sta,
1132                              struct iwl_scale_tbl_info *tbl, int index)
1133 {
1134         u16 rate_mask;
1135         s32 rate;
1136         s8 is_green = lq_sta->is_green;
1137
1138         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1139             !sta->ht_info.ht_supported)
1140                 return -1;
1141
1142         if (((sta->ht_info.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1143                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1144                 return -1;
1145
1146         /* Need both Tx chains/antennas to support MIMO */
1147         if (priv->hw_params.tx_chains_num < 2)
1148                 return -1;
1149
1150         IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1151
1152         tbl->lq_type = LQ_MIMO2;
1153         tbl->is_dup = lq_sta->is_dup;
1154         tbl->action = 0;
1155         rate_mask = lq_sta->active_mimo2_rate;
1156
1157         if (priv->current_ht_config.supported_chan_width
1158                                         == IWL_CHANNEL_WIDTH_40MHZ)
1159                 tbl->is_fat = 1;
1160         else
1161                 tbl->is_fat = 0;
1162
1163         /* FIXME: - don't toggle SGI here
1164         if (tbl->is_fat) {
1165                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1166                         tbl->is_SGI = 1;
1167                 else
1168                         tbl->is_SGI = 0;
1169         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1170                 tbl->is_SGI = 1;
1171         else
1172                 tbl->is_SGI = 0;
1173         */
1174
1175         rs_set_expected_tpt_table(lq_sta, tbl);
1176
1177         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1178
1179         IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1180
1181         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1182                 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1183                                                 rate, rate_mask);
1184                 return -1;
1185         }
1186         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1187
1188         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1189                      tbl->current_rate, is_green);
1190         return 0;
1191 }
1192
1193 /*
1194  * Set up search table for SISO
1195  */
1196 static int rs_switch_to_siso(struct iwl_priv *priv,
1197                              struct iwl_lq_sta *lq_sta,
1198                              struct ieee80211_conf *conf,
1199                              struct ieee80211_sta *sta,
1200                              struct iwl_scale_tbl_info *tbl, int index)
1201 {
1202         u16 rate_mask;
1203         u8 is_green = lq_sta->is_green;
1204         s32 rate;
1205
1206         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1207             !sta->ht_info.ht_supported)
1208                 return -1;
1209
1210         IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1211
1212         tbl->is_dup = lq_sta->is_dup;
1213         tbl->lq_type = LQ_SISO;
1214         tbl->action = 0;
1215         rate_mask = lq_sta->active_siso_rate;
1216
1217         if (priv->current_ht_config.supported_chan_width
1218             == IWL_CHANNEL_WIDTH_40MHZ)
1219                 tbl->is_fat = 1;
1220         else
1221                 tbl->is_fat = 0;
1222
1223         /* FIXME: - don't toggle SGI here
1224         if (tbl->is_fat) {
1225                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1226                         tbl->is_SGI = 1;
1227                 else
1228                         tbl->is_SGI = 0;
1229         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1230                 tbl->is_SGI = 1;
1231         else
1232                 tbl->is_SGI = 0;
1233         */
1234
1235         if (is_green)
1236                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1237
1238         rs_set_expected_tpt_table(lq_sta, tbl);
1239         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1240
1241         IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1242         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1243                 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1244                              rate, rate_mask);
1245                 return -1;
1246         }
1247         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1248         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1249                      tbl->current_rate, is_green);
1250         return 0;
1251 }
1252
1253 /*
1254  * Try to switch to new modulation mode from legacy
1255  */
1256 static int rs_move_legacy_other(struct iwl_priv *priv,
1257                                 struct iwl_lq_sta *lq_sta,
1258                                 struct ieee80211_conf *conf,
1259                                 struct ieee80211_sta *sta,
1260                                 int index)
1261 {
1262         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1263         struct iwl_scale_tbl_info *search_tbl =
1264                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1265         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1266         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1267                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1268         u8 start_action = tbl->action;
1269         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1270         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1271         int ret = 0;
1272
1273         for (; ;) {
1274                 switch (tbl->action) {
1275                 case IWL_LEGACY_SWITCH_ANTENNA1:
1276                 case IWL_LEGACY_SWITCH_ANTENNA2:
1277                         IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1278
1279                         lq_sta->action_counter++;
1280
1281                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1282                                                         tx_chains_num <= 1) ||
1283                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1284                                                         tx_chains_num <= 2))
1285                                 break;
1286
1287                         /* Don't change antenna if success has been great */
1288                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1289                                 break;
1290
1291                         /* Set up search table to try other antenna */
1292                         memcpy(search_tbl, tbl, sz);
1293
1294                         if (rs_toggle_antenna(valid_tx_ant,
1295                                 &search_tbl->current_rate, search_tbl)) {
1296                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1297                                 goto out;
1298                         }
1299                         break;
1300                 case IWL_LEGACY_SWITCH_SISO:
1301                         IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1302
1303                         /* Set up search table to try SISO */
1304                         memcpy(search_tbl, tbl, sz);
1305                         search_tbl->is_SGI = 0;
1306                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1307                                                  search_tbl, index);
1308                         if (!ret) {
1309                                 lq_sta->action_counter = 0;
1310                                 goto out;
1311                         }
1312
1313                         break;
1314                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1315                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1316                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1317                         IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1318
1319                         /* Set up search table to try MIMO */
1320                         memcpy(search_tbl, tbl, sz);
1321                         search_tbl->is_SGI = 0;
1322
1323                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1324                                 search_tbl->ant_type = ANT_AB;
1325                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1326                                 search_tbl->ant_type = ANT_AC;
1327                         else
1328                                 search_tbl->ant_type = ANT_BC;
1329
1330                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1331                                 break;
1332
1333                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1334                                                  search_tbl, index);
1335                         if (!ret) {
1336                                 lq_sta->action_counter = 0;
1337                                 goto out;
1338                         }
1339                         break;
1340                 }
1341                 tbl->action++;
1342                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1343                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1344
1345                 if (tbl->action == start_action)
1346                         break;
1347
1348         }
1349         search_tbl->lq_type = LQ_NONE;
1350         return 0;
1351
1352 out:
1353         lq_sta->search_better_tbl = 1;
1354         tbl->action++;
1355         if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1356                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1357         return 0;
1358
1359 }
1360
1361 /*
1362  * Try to switch to new modulation mode from SISO
1363  */
1364 static int rs_move_siso_to_other(struct iwl_priv *priv,
1365                                  struct iwl_lq_sta *lq_sta,
1366                                  struct ieee80211_conf *conf,
1367                                  struct ieee80211_sta *sta, int index)
1368 {
1369         u8 is_green = lq_sta->is_green;
1370         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1371         struct iwl_scale_tbl_info *search_tbl =
1372                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1373         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1374         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1375                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1376         u8 start_action = tbl->action;
1377         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1378         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1379         int ret;
1380
1381         for (;;) {
1382                 lq_sta->action_counter++;
1383                 switch (tbl->action) {
1384                 case IWL_SISO_SWITCH_ANTENNA1:
1385                 case IWL_SISO_SWITCH_ANTENNA2:
1386                         IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1387
1388                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1389                                                         tx_chains_num <= 1) ||
1390                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1391                                                         tx_chains_num <= 2))
1392                                 break;
1393
1394                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1395                                 break;
1396
1397                         memcpy(search_tbl, tbl, sz);
1398                         if (rs_toggle_antenna(valid_tx_ant,
1399                                        &search_tbl->current_rate, search_tbl))
1400                                 goto out;
1401                         break;
1402                 case IWL_SISO_SWITCH_MIMO2_AB:
1403                 case IWL_SISO_SWITCH_MIMO2_AC:
1404                 case IWL_SISO_SWITCH_MIMO2_BC:
1405                         IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1406                         memcpy(search_tbl, tbl, sz);
1407                         search_tbl->is_SGI = 0;
1408
1409                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1410                                 search_tbl->ant_type = ANT_AB;
1411                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1412                                 search_tbl->ant_type = ANT_AC;
1413                         else
1414                                 search_tbl->ant_type = ANT_BC;
1415
1416                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1417                                 break;
1418
1419                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1420                                                  search_tbl, index);
1421                         if (!ret)
1422                                 goto out;
1423                         break;
1424                 case IWL_SISO_SWITCH_GI:
1425                         if (!tbl->is_fat &&
1426                                 !(priv->current_ht_config.sgf &
1427                                                 HT_SHORT_GI_20MHZ))
1428                                 break;
1429                         if (tbl->is_fat &&
1430                                 !(priv->current_ht_config.sgf &
1431                                                 HT_SHORT_GI_40MHZ))
1432                                 break;
1433
1434                         IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1435
1436                         memcpy(search_tbl, tbl, sz);
1437                         if (is_green) {
1438                                 if (!tbl->is_SGI)
1439                                         break;
1440                                 else
1441                                         IWL_ERROR("SGI was set in GF+SISO\n");
1442                         }
1443                         search_tbl->is_SGI = !tbl->is_SGI;
1444                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1445                         if (tbl->is_SGI) {
1446                                 s32 tpt = lq_sta->last_tpt / 100;
1447                                 if (tpt >= search_tbl->expected_tpt[index])
1448                                         break;
1449                         }
1450                         search_tbl->current_rate = rate_n_flags_from_tbl(
1451                                                 search_tbl, index, is_green);
1452                         goto out;
1453                 }
1454                 tbl->action++;
1455                 if (tbl->action > IWL_SISO_SWITCH_GI)
1456                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1457
1458                 if (tbl->action == start_action)
1459                         break;
1460         }
1461         search_tbl->lq_type = LQ_NONE;
1462         return 0;
1463
1464  out:
1465         lq_sta->search_better_tbl = 1;
1466         tbl->action++;
1467         if (tbl->action > IWL_SISO_SWITCH_GI)
1468                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1469         return 0;
1470 }
1471
1472 /*
1473  * Try to switch to new modulation mode from MIMO
1474  */
1475 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1476                                  struct iwl_lq_sta *lq_sta,
1477                                  struct ieee80211_conf *conf,
1478                                  struct ieee80211_sta *sta, int index)
1479 {
1480         s8 is_green = lq_sta->is_green;
1481         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1482         struct iwl_scale_tbl_info *search_tbl =
1483                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1484         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1485         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1486                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1487         u8 start_action = tbl->action;
1488         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1489         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1490         int ret;
1491
1492         for (;;) {
1493                 lq_sta->action_counter++;
1494                 switch (tbl->action) {
1495                 case IWL_MIMO2_SWITCH_ANTENNA1:
1496                 case IWL_MIMO2_SWITCH_ANTENNA2:
1497                         IWL_DEBUG_RATE("LQ: MIMO toggle Antennas\n");
1498
1499                         if (tx_chains_num <= 2)
1500                                 break;
1501
1502                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1503                                 break;
1504
1505                         memcpy(search_tbl, tbl, sz);
1506                         if (rs_toggle_antenna(valid_tx_ant,
1507                                        &search_tbl->current_rate, search_tbl))
1508                                 goto out;
1509                         break;
1510                 case IWL_MIMO2_SWITCH_SISO_A:
1511                 case IWL_MIMO2_SWITCH_SISO_B:
1512                 case IWL_MIMO2_SWITCH_SISO_C:
1513                         IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1514
1515                         /* Set up new search table for SISO */
1516                         memcpy(search_tbl, tbl, sz);
1517
1518                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1519                                 search_tbl->ant_type = ANT_A;
1520                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1521                                 search_tbl->ant_type = ANT_B;
1522                         else
1523                                 search_tbl->ant_type = ANT_C;
1524
1525                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1526                                 break;
1527
1528                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1529                                                  search_tbl, index);
1530                         if (!ret)
1531                                 goto out;
1532
1533                         break;
1534
1535                 case IWL_MIMO2_SWITCH_GI:
1536                         if (!tbl->is_fat &&
1537                                 !(priv->current_ht_config.sgf &
1538                                                 HT_SHORT_GI_20MHZ))
1539                                 break;
1540                         if (tbl->is_fat &&
1541                                 !(priv->current_ht_config.sgf &
1542                                                 HT_SHORT_GI_40MHZ))
1543                                 break;
1544
1545                         IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1546
1547                         /* Set up new search table for MIMO */
1548                         memcpy(search_tbl, tbl, sz);
1549                         search_tbl->is_SGI = !tbl->is_SGI;
1550                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1551                         /*
1552                          * If active table already uses the fastest possible
1553                          * modulation (dual stream with short guard interval),
1554                          * and it's working well, there's no need to look
1555                          * for a better type of modulation!
1556                          */
1557                         if (tbl->is_SGI) {
1558                                 s32 tpt = lq_sta->last_tpt / 100;
1559                                 if (tpt >= search_tbl->expected_tpt[index])
1560                                         break;
1561                         }
1562                         search_tbl->current_rate = rate_n_flags_from_tbl(
1563                                                 search_tbl, index, is_green);
1564                         goto out;
1565
1566                 }
1567                 tbl->action++;
1568                 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1569                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1570
1571                 if (tbl->action == start_action)
1572                         break;
1573         }
1574         search_tbl->lq_type = LQ_NONE;
1575         return 0;
1576  out:
1577         lq_sta->search_better_tbl = 1;
1578         tbl->action++;
1579         if (tbl->action > IWL_MIMO2_SWITCH_GI)
1580                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1581         return 0;
1582
1583 }
1584
1585 /*
1586  * Check whether we should continue using same modulation mode, or
1587  * begin search for a new mode, based on:
1588  * 1) # tx successes or failures while using this mode
1589  * 2) # times calling this function
1590  * 3) elapsed time in this mode (not used, for now)
1591  */
1592 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1593 {
1594         struct iwl_scale_tbl_info *tbl;
1595         int i;
1596         int active_tbl;
1597         int flush_interval_passed = 0;
1598         struct iwl_priv *priv;
1599
1600         priv = lq_sta->drv;
1601         active_tbl = lq_sta->active_tbl;
1602
1603         tbl = &(lq_sta->lq_info[active_tbl]);
1604
1605         /* If we've been disallowing search, see if we should now allow it */
1606         if (lq_sta->stay_in_tbl) {
1607
1608                 /* Elapsed time using current modulation mode */
1609                 if (lq_sta->flush_timer)
1610                         flush_interval_passed =
1611                             time_after(jiffies,
1612                                        (unsigned long)(lq_sta->flush_timer +
1613                                         IWL_RATE_SCALE_FLUSH_INTVL));
1614
1615                 /*
1616                  * Check if we should allow search for new modulation mode.
1617                  * If many frames have failed or succeeded, or we've used
1618                  * this same modulation for a long time, allow search, and
1619                  * reset history stats that keep track of whether we should
1620                  * allow a new search.  Also (below) reset all bitmaps and
1621                  * stats in active history.
1622                  */
1623                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1624                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1625                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1626                      && (flush_interval_passed))) {
1627                         IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1628                                      lq_sta->total_failed,
1629                                      lq_sta->total_success,
1630                                      flush_interval_passed);
1631
1632                         /* Allow search for new mode */
1633                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1634                         lq_sta->total_failed = 0;
1635                         lq_sta->total_success = 0;
1636                         lq_sta->flush_timer = 0;
1637
1638                 /*
1639                  * Else if we've used this modulation mode enough repetitions
1640                  * (regardless of elapsed time or success/failure), reset
1641                  * history bitmaps and rate-specific stats for all rates in
1642                  * active table.
1643                  */
1644                 } else {
1645                         lq_sta->table_count++;
1646                         if (lq_sta->table_count >=
1647                             lq_sta->table_count_limit) {
1648                                 lq_sta->table_count = 0;
1649
1650                                 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1651                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1652                                         rs_rate_scale_clear_window(
1653                                                 &(tbl->win[i]));
1654                         }
1655                 }
1656
1657                 /* If transitioning to allow "search", reset all history
1658                  * bitmaps and stats in active table (this will become the new
1659                  * "search" table). */
1660                 if (!lq_sta->stay_in_tbl) {
1661                         for (i = 0; i < IWL_RATE_COUNT; i++)
1662                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1663                 }
1664         }
1665 }
1666
1667 /*
1668  * Do rate scaling and search for new modulation mode.
1669  */
1670 static void rs_rate_scale_perform(struct iwl_priv *priv,
1671                                   struct ieee80211_hdr *hdr,
1672                                   struct ieee80211_sta *sta,
1673                                   struct iwl_lq_sta *lq_sta)
1674 {
1675         struct ieee80211_hw *hw = priv->hw;
1676         struct ieee80211_conf *conf = &hw->conf;
1677         int low = IWL_RATE_INVALID;
1678         int high = IWL_RATE_INVALID;
1679         int index;
1680         int i;
1681         struct iwl_rate_scale_data *window = NULL;
1682         int current_tpt = IWL_INVALID_VALUE;
1683         int low_tpt = IWL_INVALID_VALUE;
1684         int high_tpt = IWL_INVALID_VALUE;
1685         u32 fail_count;
1686         s8 scale_action = 0;
1687         __le16 fc;
1688         u16 rate_mask;
1689         u8 update_lq = 0;
1690         struct iwl_scale_tbl_info *tbl, *tbl1;
1691         u16 rate_scale_index_msk = 0;
1692         u32 rate;
1693         u8 is_green = 0;
1694         u8 active_tbl = 0;
1695         u8 done_search = 0;
1696         u16 high_low;
1697         s32 sr;
1698         u8 tid = MAX_TID_COUNT;
1699
1700         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1701
1702         fc = hdr->frame_control;
1703         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1704                 /* Send management frames and broadcast/multicast data using
1705                  * lowest rate. */
1706                 /* TODO: this could probably be improved.. */
1707                 return;
1708         }
1709
1710         if (!sta || !lq_sta)
1711                 return;
1712
1713         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1714
1715         tid = rs_tl_add_packet(lq_sta, hdr);
1716
1717         /*
1718          * Select rate-scale / modulation-mode table to work with in
1719          * the rest of this function:  "search" if searching for better
1720          * modulation mode, or "active" if doing rate scaling within a mode.
1721          */
1722         if (!lq_sta->search_better_tbl)
1723                 active_tbl = lq_sta->active_tbl;
1724         else
1725                 active_tbl = 1 - lq_sta->active_tbl;
1726
1727         tbl = &(lq_sta->lq_info[active_tbl]);
1728         is_green = lq_sta->is_green;
1729
1730         /* current tx rate */
1731         index = lq_sta->last_txrate_idx;
1732
1733         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1734                        tbl->lq_type);
1735
1736         /* rates available for this association, and for modulation mode */
1737         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1738
1739         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1740
1741         /* mask with station rate restriction */
1742         if (is_legacy(tbl->lq_type)) {
1743                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1744                         /* supp_rates has no CCK bits in A mode */
1745                         rate_scale_index_msk = (u16) (rate_mask &
1746                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1747                 else
1748                         rate_scale_index_msk = (u16) (rate_mask &
1749                                                       lq_sta->supp_rates);
1750
1751         } else
1752                 rate_scale_index_msk = rate_mask;
1753
1754         if (!rate_scale_index_msk)
1755                 rate_scale_index_msk = rate_mask;
1756
1757         if (!((1 << index) & rate_scale_index_msk)) {
1758                 IWL_ERROR("Current Rate is not valid\n");
1759                 return;
1760         }
1761
1762         /* Get expected throughput table and history window for current rate */
1763         if (!tbl->expected_tpt) {
1764                 IWL_ERROR("tbl->expected_tpt is NULL\n");
1765                 return;
1766         }
1767
1768         window = &(tbl->win[index]);
1769
1770         /*
1771          * If there is not enough history to calculate actual average
1772          * throughput, keep analyzing results of more tx frames, without
1773          * changing rate or mode (bypass most of the rest of this function).
1774          * Set up new rate table in uCode only if old rate is not supported
1775          * in current association (use new rate found above).
1776          */
1777         fail_count = window->counter - window->success_counter;
1778         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1779                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1780                 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1781                                "for index %d\n",
1782                                window->success_counter, window->counter, index);
1783
1784                 /* Can't calculate this yet; not enough history */
1785                 window->average_tpt = IWL_INVALID_VALUE;
1786
1787                 /* Should we stay with this modulation mode,
1788                  * or search for a new one? */
1789                 rs_stay_in_table(lq_sta);
1790
1791                 goto out;
1792         }
1793
1794         /* Else we have enough samples; calculate estimate of
1795          * actual average throughput */
1796
1797         BUG_ON(window->average_tpt != ((window->success_ratio *
1798                         tbl->expected_tpt[index] + 64) / 128));
1799
1800         /* If we are searching for better modulation mode, check success. */
1801         if (lq_sta->search_better_tbl) {
1802
1803                 /* If good success, continue using the "search" mode;
1804                  * no need to send new link quality command, since we're
1805                  * continuing to use the setup that we've been trying. */
1806                 if (window->average_tpt > lq_sta->last_tpt) {
1807
1808                         IWL_DEBUG_RATE("LQ: SWITCHING TO NEW TABLE "
1809                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1810                                         window->success_ratio,
1811                                         window->average_tpt,
1812                                         lq_sta->last_tpt);
1813
1814                         if (!is_legacy(tbl->lq_type))
1815                                 lq_sta->enable_counter = 1;
1816
1817                         /* Swap tables; "search" becomes "active" */
1818                         lq_sta->active_tbl = active_tbl;
1819                         current_tpt = window->average_tpt;
1820
1821                 /* Else poor success; go back to mode in "active" table */
1822                 } else {
1823
1824                         IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1825                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1826                                         window->success_ratio,
1827                                         window->average_tpt,
1828                                         lq_sta->last_tpt);
1829
1830                         /* Nullify "search" table */
1831                         tbl->lq_type = LQ_NONE;
1832
1833                         /* Revert to "active" table */
1834                         active_tbl = lq_sta->active_tbl;
1835                         tbl = &(lq_sta->lq_info[active_tbl]);
1836
1837                         /* Revert to "active" rate and throughput info */
1838                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1839                         current_tpt = lq_sta->last_tpt;
1840
1841                         /* Need to set up a new rate table in uCode */
1842                         update_lq = 1;
1843                 }
1844
1845                 /* Either way, we've made a decision; modulation mode
1846                  * search is done, allow rate adjustment next time. */
1847                 lq_sta->search_better_tbl = 0;
1848                 done_search = 1;        /* Don't switch modes below! */
1849                 goto lq_update;
1850         }
1851
1852         /* (Else) not in search of better modulation mode, try for better
1853          * starting rate, while staying in this mode. */
1854         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1855                                         tbl->lq_type);
1856         low = high_low & 0xff;
1857         high = (high_low >> 8) & 0xff;
1858
1859         sr = window->success_ratio;
1860
1861         /* Collect measured throughputs for current and adjacent rates */
1862         current_tpt = window->average_tpt;
1863         if (low != IWL_RATE_INVALID)
1864                 low_tpt = tbl->win[low].average_tpt;
1865         if (high != IWL_RATE_INVALID)
1866                 high_tpt = tbl->win[high].average_tpt;
1867
1868         scale_action = 0;
1869
1870         /* Too many failures, decrease rate */
1871         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1872                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1873                 scale_action = -1;
1874
1875         /* No throughput measured yet for adjacent rates; try increase. */
1876         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1877                    (high_tpt == IWL_INVALID_VALUE)) {
1878
1879                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1880                         scale_action = 1;
1881                 else if (low != IWL_RATE_INVALID)
1882                         scale_action = -1;
1883         }
1884
1885         /* Both adjacent throughputs are measured, but neither one has better
1886          * throughput; we're using the best rate, don't change it! */
1887         else if ((low_tpt != IWL_INVALID_VALUE) &&
1888                  (high_tpt != IWL_INVALID_VALUE) &&
1889                  (low_tpt < current_tpt) &&
1890                  (high_tpt < current_tpt))
1891                 scale_action = 0;
1892
1893         /* At least one adjacent rate's throughput is measured,
1894          * and may have better performance. */
1895         else {
1896                 /* Higher adjacent rate's throughput is measured */
1897                 if (high_tpt != IWL_INVALID_VALUE) {
1898                         /* Higher rate has better throughput */
1899                         if (high_tpt > current_tpt &&
1900                                         sr >= IWL_RATE_INCREASE_TH) {
1901                                 scale_action = 1;
1902                         } else {
1903                                 IWL_DEBUG_RATE
1904                                     ("decrease rate because of high tpt\n");
1905                                 scale_action = -1;
1906                         }
1907
1908                 /* Lower adjacent rate's throughput is measured */
1909                 } else if (low_tpt != IWL_INVALID_VALUE) {
1910                         /* Lower rate has better throughput */
1911                         if (low_tpt > current_tpt) {
1912                                 IWL_DEBUG_RATE
1913                                     ("decrease rate because of low tpt\n");
1914                                 scale_action = -1;
1915                         } else if (sr >= IWL_RATE_INCREASE_TH) {
1916                                 scale_action = 1;
1917                         }
1918                 }
1919         }
1920
1921         /* Sanity check; asked for decrease, but success rate or throughput
1922          * has been good at old rate.  Don't change it. */
1923         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1924                     ((sr > IWL_RATE_HIGH_TH) ||
1925                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1926                 scale_action = 0;
1927
1928         switch (scale_action) {
1929         case -1:
1930                 /* Decrease starting rate, update uCode's rate table */
1931                 if (low != IWL_RATE_INVALID) {
1932                         update_lq = 1;
1933                         index = low;
1934                 }
1935                 break;
1936         case 1:
1937                 /* Increase starting rate, update uCode's rate table */
1938                 if (high != IWL_RATE_INVALID) {
1939                         update_lq = 1;
1940                         index = high;
1941                 }
1942
1943                 break;
1944         case 0:
1945                 /* No change */
1946         default:
1947                 break;
1948         }
1949
1950         IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1951                     "high %d type %d\n",
1952                      index, scale_action, low, high, tbl->lq_type);
1953
1954 lq_update:
1955         /* Replace uCode's rate table for the destination station. */
1956         if (update_lq) {
1957                 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1958                 rs_fill_link_cmd(priv, lq_sta, rate);
1959                 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1960         }
1961
1962         /* Should we stay with this modulation mode, or search for a new one? */
1963         rs_stay_in_table(lq_sta);
1964
1965         /*
1966          * Search for new modulation mode if we're:
1967          * 1)  Not changing rates right now
1968          * 2)  Not just finishing up a search
1969          * 3)  Allowing a new search
1970          */
1971         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1972                 /* Save current throughput to compare with "search" throughput*/
1973                 lq_sta->last_tpt = current_tpt;
1974
1975                 /* Select a new "search" modulation mode to try.
1976                  * If one is found, set up the new "search" table. */
1977                 if (is_legacy(tbl->lq_type))
1978                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1979                 else if (is_siso(tbl->lq_type))
1980                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1981                 else
1982                         rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1983
1984                 /* If new "search" mode was selected, set up in uCode table */
1985                 if (lq_sta->search_better_tbl) {
1986                         /* Access the "search" table, clear its history. */
1987                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1988                         for (i = 0; i < IWL_RATE_COUNT; i++)
1989                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1990
1991                         /* Use new "search" start rate */
1992                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1993
1994                         IWL_DEBUG_RATE("Switch current  mcs: %X index: %d\n",
1995                                      tbl->current_rate, index);
1996                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
1997                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1998                 }
1999
2000                 /* If the "active" (non-search) mode was legacy,
2001                  * and we've tried switching antennas,
2002                  * but we haven't been able to try HT modes (not available),
2003                  * stay with best antenna legacy modulation for a while
2004                  * before next round of mode comparisons. */
2005                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2006                 if (is_legacy(tbl1->lq_type) &&
2007                    (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
2008                     (lq_sta->action_counter >= 1)) {
2009                         lq_sta->action_counter = 0;
2010                         IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
2011                         rs_set_stay_in_table(priv, 1, lq_sta);
2012                 }
2013
2014                 /* If we're in an HT mode, and all 3 mode switch actions
2015                  * have been tried and compared, stay in this best modulation
2016                  * mode for a while before next round of mode comparisons. */
2017                 if (lq_sta->enable_counter &&
2018                     (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2019                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2020                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2021                             (tid != MAX_TID_COUNT)) {
2022                                 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
2023                                 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2024                         }
2025                         lq_sta->action_counter = 0;
2026                         rs_set_stay_in_table(priv, 0, lq_sta);
2027                 }
2028
2029         /*
2030          * Else, don't search for a new modulation mode.
2031          * Put new timestamp in stay-in-modulation-mode flush timer if:
2032          * 1)  Not changing rates right now
2033          * 2)  Not just finishing up a search
2034          * 3)  flush timer is empty
2035          */
2036         } else {
2037                 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2038                         lq_sta->flush_timer = jiffies;
2039         }
2040
2041 out:
2042         tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2043         i = index;
2044         lq_sta->last_txrate_idx = i;
2045
2046         return;
2047 }
2048
2049
2050 static void rs_initialize_lq(struct iwl_priv *priv,
2051                              struct ieee80211_conf *conf,
2052                              struct ieee80211_sta *sta,
2053                              struct iwl_lq_sta *lq_sta)
2054 {
2055         struct iwl_scale_tbl_info *tbl;
2056         int rate_idx;
2057         int i;
2058         u32 rate;
2059         u8 use_green = rs_use_green(priv, conf);
2060         u8 active_tbl = 0;
2061         u8 valid_tx_ant;
2062
2063         if (!sta || !lq_sta)
2064                 goto out;
2065
2066         i = lq_sta->last_txrate_idx;
2067
2068         if ((lq_sta->lq.sta_id == 0xff) &&
2069             (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2070                 goto out;
2071
2072         valid_tx_ant = priv->hw_params.valid_tx_ant;
2073
2074         if (!lq_sta->search_better_tbl)
2075                 active_tbl = lq_sta->active_tbl;
2076         else
2077                 active_tbl = 1 - lq_sta->active_tbl;
2078
2079         tbl = &(lq_sta->lq_info[active_tbl]);
2080
2081         if ((i < 0) || (i >= IWL_RATE_COUNT))
2082                 i = 0;
2083
2084         /* FIXME:RS: This is also wrong in 4965 */
2085         rate = iwl_rates[i].plcp;
2086         rate |= RATE_MCS_ANT_B_MSK;
2087         rate &= ~RATE_MCS_ANT_A_MSK;
2088
2089         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2090                 rate |= RATE_MCS_CCK_MSK;
2091
2092         tbl->ant_type = ANT_B;
2093         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2094         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2095             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2096
2097         rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2098         tbl->current_rate = rate;
2099         rs_set_expected_tpt_table(lq_sta, tbl);
2100         rs_fill_link_cmd(NULL, lq_sta, rate);
2101         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2102  out:
2103         return;
2104 }
2105
2106 static void rs_get_rate(void *priv_r, struct ieee80211_supported_band *sband,
2107                         struct ieee80211_sta *sta, void *priv_sta,
2108                         struct sk_buff *skb, struct rate_selection *sel)
2109 {
2110
2111         int i;
2112         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2113         struct ieee80211_conf *conf = &priv->hw->conf;
2114         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2115         __le16 fc;
2116         struct iwl_lq_sta *lq_sta;
2117
2118         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2119
2120         /* Send management frames and broadcast/multicast data using lowest
2121          * rate. */
2122         fc = hdr->frame_control;
2123         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2124             !sta || !priv_sta) {
2125                 sel->rate_idx = rate_lowest_index(sband, sta);
2126                 return;
2127         }
2128
2129         lq_sta = (struct iwl_lq_sta *)priv_sta;
2130         i = lq_sta->last_txrate_idx;
2131
2132         if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2133             !lq_sta->ibss_sta_added) {
2134                 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2135                 DECLARE_MAC_BUF(mac);
2136
2137                 if (sta_id == IWL_INVALID_STATION) {
2138                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2139                                        print_mac(mac, hdr->addr1));
2140                         sta_id = iwl_add_station_flags(priv, hdr->addr1,
2141                                                         0, CMD_ASYNC, NULL);
2142                 }
2143                 if ((sta_id != IWL_INVALID_STATION)) {
2144                         lq_sta->lq.sta_id = sta_id;
2145                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2146                         lq_sta->ibss_sta_added = 1;
2147                         rs_initialize_lq(priv, conf, sta, lq_sta);
2148                 }
2149         }
2150
2151         if ((i < 0) || (i > IWL_RATE_COUNT)) {
2152                 sel->rate_idx = rate_lowest_index(sband, sta);
2153                 return;
2154         }
2155
2156         if (sband->band == IEEE80211_BAND_5GHZ)
2157                 i -= IWL_FIRST_OFDM_RATE;
2158         sel->rate_idx = i;
2159 }
2160
2161 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2162                           gfp_t gfp)
2163 {
2164         struct iwl_lq_sta *lq_sta;
2165         struct iwl_priv *priv;
2166         int i, j;
2167
2168         priv = (struct iwl_priv *)priv_rate;
2169         IWL_DEBUG_RATE("create station rate scale window\n");
2170
2171         lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2172
2173         if (lq_sta == NULL)
2174                 return NULL;
2175         lq_sta->lq.sta_id = 0xff;
2176
2177
2178         for (j = 0; j < LQ_SIZE; j++)
2179                 for (i = 0; i < IWL_RATE_COUNT; i++)
2180                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2181
2182         return lq_sta;
2183 }
2184
2185 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2186                          struct ieee80211_sta *sta, void *priv_sta)
2187 {
2188         int i, j;
2189         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2190         struct ieee80211_conf *conf = &priv->hw->conf;
2191         struct iwl_lq_sta *lq_sta = priv_sta;
2192
2193         lq_sta->flush_timer = 0;
2194         lq_sta->supp_rates = sta->supp_rates[sband->band];
2195         for (j = 0; j < LQ_SIZE; j++)
2196                 for (i = 0; i < IWL_RATE_COUNT; i++)
2197                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2198
2199         IWL_DEBUG_RATE("LQ: *** rate scale station global init ***\n");
2200         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2201          * the lowest or the highest rate.. Could consider using RSSI from
2202          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2203          * after assoc.. */
2204
2205         lq_sta->ibss_sta_added = 0;
2206         if (priv->iw_mode == NL80211_IFTYPE_AP) {
2207                 u8 sta_id = iwl_find_station(priv, sta->addr);
2208                 DECLARE_MAC_BUF(mac);
2209
2210                 /* for IBSS the call are from tasklet */
2211                 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2212                              print_mac(mac, sta->addr));
2213
2214                 if (sta_id == IWL_INVALID_STATION) {
2215                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2216                                        print_mac(mac, sta->addr));
2217                         sta_id = iwl_add_station_flags(priv, sta->addr,
2218                                                         0, CMD_ASYNC, NULL);
2219                 }
2220                 if ((sta_id != IWL_INVALID_STATION)) {
2221                         lq_sta->lq.sta_id = sta_id;
2222                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2223                 }
2224                 /* FIXME: this is w/a remove it later */
2225                 priv->assoc_station_added = 1;
2226         }
2227
2228         /* Find highest tx rate supported by hardware and destination station */
2229         lq_sta->last_txrate_idx = 3;
2230         for (i = 0; i < sband->n_bitrates; i++)
2231                 if (sta->supp_rates[sband->band] & BIT(i))
2232                         lq_sta->last_txrate_idx = i;
2233
2234         /* For MODE_IEEE80211A, skip over cck rates in global rate table */
2235         if (sband->band == IEEE80211_BAND_5GHZ)
2236                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2237
2238         lq_sta->is_dup = 0;
2239         lq_sta->is_green = rs_use_green(priv, conf);
2240         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2241         lq_sta->active_rate_basic = priv->active_rate_basic;
2242         lq_sta->band = priv->band;
2243         /*
2244          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2245          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2246          */
2247         lq_sta->active_siso_rate = conf->ht_conf.supp_mcs_set[0] << 1;
2248         lq_sta->active_siso_rate |= conf->ht_conf.supp_mcs_set[0] & 0x1;
2249         lq_sta->active_siso_rate &= ~((u16)0x2);
2250         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2251
2252         /* Same here */
2253         lq_sta->active_mimo2_rate = conf->ht_conf.supp_mcs_set[1] << 1;
2254         lq_sta->active_mimo2_rate |= conf->ht_conf.supp_mcs_set[1] & 0x1;
2255         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2256         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2257
2258         lq_sta->active_mimo3_rate = conf->ht_conf.supp_mcs_set[2] << 1;
2259         lq_sta->active_mimo3_rate |= conf->ht_conf.supp_mcs_set[2] & 0x1;
2260         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2261         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2262
2263         IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2264                      lq_sta->active_siso_rate,
2265                      lq_sta->active_mimo2_rate,
2266                      lq_sta->active_mimo3_rate);
2267
2268         /* These values will be overriden later */
2269         lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2270         lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2271
2272         /* as default allow aggregation for all tids */
2273         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2274         lq_sta->drv = priv;
2275
2276         rs_initialize_lq(priv, conf, sta, lq_sta);
2277 }
2278
2279 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2280                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2281 {
2282         struct iwl_scale_tbl_info tbl_type;
2283         int index = 0;
2284         int rate_idx;
2285         int repeat_rate = 0;
2286         u8 ant_toggle_cnt = 0;
2287         u8 use_ht_possible = 1;
2288         u8 valid_tx_ant = 0;
2289         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2290
2291         /* Override starting rate (index 0) if needed for debug purposes */
2292         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2293
2294         /* Interpret new_rate (rate_n_flags) */
2295         memset(&tbl_type, 0, sizeof(tbl_type));
2296         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2297                                   &tbl_type, &rate_idx);
2298
2299         /* How many times should we repeat the initial rate? */
2300         if (is_legacy(tbl_type.lq_type)) {
2301                 ant_toggle_cnt = 1;
2302                 repeat_rate = IWL_NUMBER_TRY;
2303         } else {
2304                 repeat_rate = IWL_HT_NUMBER_TRY;
2305         }
2306
2307         lq_cmd->general_params.mimo_delimiter =
2308                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2309
2310         /* Fill 1st table entry (index 0) */
2311         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2312
2313         if (num_of_ant(tbl_type.ant_type) == 1) {
2314                 lq_cmd->general_params.single_stream_ant_msk =
2315                                                 tbl_type.ant_type;
2316         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2317                 lq_cmd->general_params.dual_stream_ant_msk =
2318                                                 tbl_type.ant_type;
2319         } /* otherwise we don't modify the existing value */
2320
2321         index++;
2322         repeat_rate--;
2323
2324         if (priv)
2325                 valid_tx_ant = priv->hw_params.valid_tx_ant;
2326
2327         /* Fill rest of rate table */
2328         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2329                 /* Repeat initial/next rate.
2330                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2331                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2332                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2333                         if (is_legacy(tbl_type.lq_type)) {
2334                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2335                                         ant_toggle_cnt++;
2336                                 else if (priv &&
2337                                          rs_toggle_antenna(valid_tx_ant,
2338                                                         &new_rate, &tbl_type))
2339                                         ant_toggle_cnt = 1;
2340 }
2341
2342                         /* Override next rate if needed for debug purposes */
2343                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2344
2345                         /* Fill next table entry */
2346                         lq_cmd->rs_table[index].rate_n_flags =
2347                                         cpu_to_le32(new_rate);
2348                         repeat_rate--;
2349                         index++;
2350                 }
2351
2352                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2353                                                 &rate_idx);
2354
2355                 /* Indicate to uCode which entries might be MIMO.
2356                  * If initial rate was MIMO, this will finally end up
2357                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2358                 if (is_mimo(tbl_type.lq_type))
2359                         lq_cmd->general_params.mimo_delimiter = index;
2360
2361                 /* Get next rate */
2362                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2363                                              use_ht_possible);
2364
2365                 /* How many times should we repeat the next rate? */
2366                 if (is_legacy(tbl_type.lq_type)) {
2367                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2368                                 ant_toggle_cnt++;
2369                         else if (priv &&
2370                                  rs_toggle_antenna(valid_tx_ant,
2371                                                    &new_rate, &tbl_type))
2372                                 ant_toggle_cnt = 1;
2373
2374                         repeat_rate = IWL_NUMBER_TRY;
2375                 } else {
2376                         repeat_rate = IWL_HT_NUMBER_TRY;
2377                 }
2378
2379                 /* Don't allow HT rates after next pass.
2380                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2381                 use_ht_possible = 0;
2382
2383                 /* Override next rate if needed for debug purposes */
2384                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2385
2386                 /* Fill next table entry */
2387                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2388
2389                 index++;
2390                 repeat_rate--;
2391         }
2392
2393         lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2394         lq_cmd->agg_params.agg_dis_start_th = 3;
2395         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2396 }
2397
2398 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2399 {
2400         return hw->priv;
2401 }
2402 /* rate scale requires free function to be implemented */
2403 static void rs_free(void *priv_rate)
2404 {
2405         return;
2406 }
2407
2408 static void rs_clear(void *priv_rate)
2409 {
2410 #ifdef CONFIG_IWLWIFI_DEBUG
2411         struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2412
2413         IWL_DEBUG_RATE("enter\n");
2414
2415         /* TODO - add rate scale state reset */
2416
2417         IWL_DEBUG_RATE("leave\n");
2418 #endif /* CONFIG_IWLWIFI_DEBUG */
2419 }
2420
2421 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2422                         void *priv_sta)
2423 {
2424         struct iwl_lq_sta *lq_sta = priv_sta;
2425         struct iwl_priv *priv = priv_r;
2426
2427         IWL_DEBUG_RATE("enter\n");
2428         kfree(lq_sta);
2429         IWL_DEBUG_RATE("leave\n");
2430 }
2431
2432
2433 #ifdef CONFIG_MAC80211_DEBUGFS
2434 static int open_file_generic(struct inode *inode, struct file *file)
2435 {
2436         file->private_data = inode->i_private;
2437         return 0;
2438 }
2439 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2440                              u32 *rate_n_flags, int index)
2441 {
2442         struct iwl_priv *priv;
2443
2444         priv = lq_sta->drv;
2445         if (lq_sta->dbg_fixed_rate) {
2446                 if (index < 12) {
2447                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2448                 } else {
2449                         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2450                                 *rate_n_flags = 0x800D;
2451                         else
2452                                 *rate_n_flags = 0x820A;
2453                 }
2454                 IWL_DEBUG_RATE("Fixed rate ON\n");
2455         } else {
2456                 IWL_DEBUG_RATE("Fixed rate OFF\n");
2457         }
2458 }
2459
2460 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2461                         const char __user *user_buf, size_t count, loff_t *ppos)
2462 {
2463         struct iwl_lq_sta *lq_sta = file->private_data;
2464         struct iwl_priv *priv;
2465         char buf[64];
2466         int buf_size;
2467         u32 parsed_rate;
2468
2469         priv = lq_sta->drv;
2470         memset(buf, 0, sizeof(buf));
2471         buf_size = min(count, sizeof(buf) -  1);
2472         if (copy_from_user(buf, user_buf, buf_size))
2473                 return -EFAULT;
2474
2475         if (sscanf(buf, "%x", &parsed_rate) == 1)
2476                 lq_sta->dbg_fixed_rate = parsed_rate;
2477         else
2478                 lq_sta->dbg_fixed_rate = 0;
2479
2480         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2481         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2482         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2483         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2484
2485         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2486                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2487
2488         if (lq_sta->dbg_fixed_rate) {
2489                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2490                 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2491         }
2492
2493         return count;
2494 }
2495
2496 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2497                         char __user *user_buf, size_t count, loff_t *ppos)
2498 {
2499         char buff[1024];
2500         int desc = 0;
2501         int i = 0;
2502
2503         struct iwl_lq_sta *lq_sta = file->private_data;
2504
2505         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2506         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2507                         lq_sta->total_failed, lq_sta->total_success,
2508                         lq_sta->active_legacy_rate);
2509         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2510                         lq_sta->dbg_fixed_rate);
2511         desc += sprintf(buff+desc, "general:"
2512                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2513                 lq_sta->lq.general_params.flags,
2514                 lq_sta->lq.general_params.mimo_delimiter,
2515                 lq_sta->lq.general_params.single_stream_ant_msk,
2516                 lq_sta->lq.general_params.dual_stream_ant_msk);
2517
2518         desc += sprintf(buff+desc, "agg:"
2519                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2520                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2521                         lq_sta->lq.agg_params.agg_dis_start_th,
2522                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2523
2524         desc += sprintf(buff+desc,
2525                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2526                         lq_sta->lq.general_params.start_rate_index[0],
2527                         lq_sta->lq.general_params.start_rate_index[1],
2528                         lq_sta->lq.general_params.start_rate_index[2],
2529                         lq_sta->lq.general_params.start_rate_index[3]);
2530
2531
2532         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2533                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2534                         i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2535
2536         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2537 }
2538
2539 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2540         .write = rs_sta_dbgfs_scale_table_write,
2541         .read = rs_sta_dbgfs_scale_table_read,
2542         .open = open_file_generic,
2543 };
2544 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2545                         char __user *user_buf, size_t count, loff_t *ppos)
2546 {
2547         char buff[1024];
2548         int desc = 0;
2549         int i, j;
2550
2551         struct iwl_lq_sta *lq_sta = file->private_data;
2552         for (i = 0; i < LQ_SIZE; i++) {
2553                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2554                                 "rate=0x%X\n",
2555                                 lq_sta->active_tbl == i?"*":"x",
2556                                 lq_sta->lq_info[i].lq_type,
2557                                 lq_sta->lq_info[i].is_SGI,
2558                                 lq_sta->lq_info[i].is_fat,
2559                                 lq_sta->lq_info[i].is_dup,
2560                                 lq_sta->lq_info[i].current_rate);
2561                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2562                         desc += sprintf(buff+desc,
2563                                 "counter=%d success=%d %%=%d\n",
2564                                 lq_sta->lq_info[i].win[j].counter,
2565                                 lq_sta->lq_info[i].win[j].success_counter,
2566                                 lq_sta->lq_info[i].win[j].success_ratio);
2567                 }
2568         }
2569         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2570 }
2571
2572 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2573         .read = rs_sta_dbgfs_stats_table_read,
2574         .open = open_file_generic,
2575 };
2576
2577 static void rs_add_debugfs(void *priv, void *priv_sta,
2578                                         struct dentry *dir)
2579 {
2580         struct iwl_lq_sta *lq_sta = priv_sta;
2581         lq_sta->rs_sta_dbgfs_scale_table_file =
2582                 debugfs_create_file("rate_scale_table", 0600, dir,
2583                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2584         lq_sta->rs_sta_dbgfs_stats_table_file =
2585                 debugfs_create_file("rate_stats_table", 0600, dir,
2586                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2587         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2588                 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2589                 &lq_sta->tx_agg_tid_en);
2590
2591 }
2592
2593 static void rs_remove_debugfs(void *priv, void *priv_sta)
2594 {
2595         struct iwl_lq_sta *lq_sta = priv_sta;
2596         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2597         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2598         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2599 }
2600 #endif
2601
2602 static struct rate_control_ops rs_ops = {
2603         .module = NULL,
2604         .name = RS_NAME,
2605         .tx_status = rs_tx_status,
2606         .get_rate = rs_get_rate,
2607         .rate_init = rs_rate_init,
2608         .clear = rs_clear,
2609         .alloc = rs_alloc,
2610         .free = rs_free,
2611         .alloc_sta = rs_alloc_sta,
2612         .free_sta = rs_free_sta,
2613 #ifdef CONFIG_MAC80211_DEBUGFS
2614         .add_sta_debugfs = rs_add_debugfs,
2615         .remove_sta_debugfs = rs_remove_debugfs,
2616 #endif
2617 };
2618
2619 int iwlagn_rate_control_register(void)
2620 {
2621         return ieee80211_rate_control_register(&rs_ops);
2622 }
2623
2624 void iwlagn_rate_control_unregister(void)
2625 {
2626         ieee80211_rate_control_unregister(&rs_ops);
2627 }
2628