drivers/net/wireless/iwlegacy/4965-rs.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/slab.h>
  29 #include <net/mac80211.h>
  30
  31 #include <linux/netdevice.h>
  32 #include <linux/etherdevice.h>
  33 #include <linux/delay.h>
  34
  35 #include <linux/workqueue.h>
  36
  37 #include "common.h"
  38 #include "4965.h"
  39
  40 #define IL4965_RS_NAME "iwl-4965-rs"
  41
  42 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  43 #define IL_NUMBER_TRY      1
  44 #define IL_HT_NUMBER_TRY   3
  45
  46 #define RATE_MAX_WINDOW         62      /* # tx in history win */
  47 #define RATE_MIN_FAILURE_TH             6       /* min failures to calc tpt */
  48 #define RATE_MIN_SUCCESS_TH             8       /* min successes to calc tpt */
  49
  50 /* max allowed rate miss before sync LQ cmd */
  51 #define IL_MISSED_RATE_MAX              15
  52 /* max time to accum history 2 seconds */
  53 #define RATE_SCALE_FLUSH_INTVL   (3*HZ)
  54
  55 static u8 rs_ht_to_legacy[] = {
  56         RATE_6M_IDX, RATE_6M_IDX,
  57         RATE_6M_IDX, RATE_6M_IDX,
  58         RATE_6M_IDX,
  59         RATE_6M_IDX, RATE_9M_IDX,
  60         RATE_12M_IDX, RATE_18M_IDX,
  61         RATE_24M_IDX, RATE_36M_IDX,
  62         RATE_48M_IDX, RATE_54M_IDX
  63 };
  64
  65 static const u8 ant_toggle_lookup[] = {
  66         /*ANT_NONE -> */ ANT_NONE,
  67         /*ANT_A    -> */ ANT_B,
  68         /*ANT_B    -> */ ANT_C,
  69         /*ANT_AB   -> */ ANT_BC,
  70         /*ANT_C    -> */ ANT_A,
  71         /*ANT_AC   -> */ ANT_AB,
  72         /*ANT_BC   -> */ ANT_AC,
  73         /*ANT_ABC  -> */ ANT_ABC,
  74 };
  75
  76 #define IL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
  77         [RATE_##r##M_IDX] = { RATE_##r##M_PLCP,      \
  78                                     RATE_SISO_##s##M_PLCP, \
  79                                     RATE_MIMO2_##s##M_PLCP,\
  80                                     RATE_##r##M_IEEE,      \
  81                                     RATE_##ip##M_IDX,    \
  82                                     RATE_##in##M_IDX,    \
  83                                     RATE_##rp##M_IDX,    \
  84                                     RATE_##rn##M_IDX,    \
  85                                     RATE_##pp##M_IDX,    \
  86                                     RATE_##np##M_IDX }
  87
  88 /*
  89  * Parameter order:
  90  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
  91  *
  92  * If there isn't a valid next or previous rate then INV is used which
  93  * maps to RATE_INVALID
  94  *
  95  */
  96 const struct il_rate_info il_rates[RATE_COUNT] = {
  97         IL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),   /*  1mbps */
  98         IL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),         /*  2mbps */
  99         IL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),       /*5.5mbps */
 100         IL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),     /* 11mbps */
 101         IL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),         /*  6mbps */
 102         IL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),        /*  9mbps */
 103         IL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
 104         IL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
 105         IL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
 106         IL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
 107         IL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
 108         IL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
 109         IL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
 110 };
 111
 112 static int
 113 il4965_hwrate_to_plcp_idx(u32 rate_n_flags)
 114 {
 115         int idx = 0;
 116
 117         /* HT rate format */
 118         if (rate_n_flags & RATE_MCS_HT_MSK) {
 119                 idx = (rate_n_flags & 0xff);
 120
 121                 if (idx >= RATE_MIMO2_6M_PLCP)
 122                         idx = idx - RATE_MIMO2_6M_PLCP;
 123
 124                 idx += IL_FIRST_OFDM_RATE;
 125                 /* skip 9M not supported in ht */
 126                 if (idx >= RATE_9M_IDX)
 127                         idx += 1;
 128                 if (idx >= IL_FIRST_OFDM_RATE && idx <= IL_LAST_OFDM_RATE)
 129                         return idx;
 130
 131                 /* legacy rate format, search for match in table */
 132         } else {
 133                 for (idx = 0; idx < ARRAY_SIZE(il_rates); idx++)
 134                         if (il_rates[idx].plcp == (rate_n_flags & 0xFF))
 135                                 return idx;
 136         }
 137
 138         return -1;
 139 }
 140
 141 static void il4965_rs_rate_scale_perform(struct il_priv *il,
 142                                          struct sk_buff *skb,
 143                                          struct ieee80211_sta *sta,
 144                                          struct il_lq_sta *lq_sta);
 145 static void il4965_rs_fill_link_cmd(struct il_priv *il,
 146                                     struct il_lq_sta *lq_sta, u32 rate_n_flags);
 147 static void il4965_rs_stay_in_table(struct il_lq_sta *lq_sta,
 148                                     bool force_search);
 149
 150 #ifdef CONFIG_MAC80211_DEBUGFS
 151 static void il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta,
 152                                     u32 *rate_n_flags, int idx);
 153 #else
 154 static void
 155 il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
 156 {
 157 }
 158 #endif
 159
 160 /**
 161  * The following tables contain the expected throughput metrics for all rates
 162  *
 163  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 164  *
 165  * where invalid entries are zeros.
 166  *
 167  * CCK rates are only valid in legacy table and will only be used in G
 168  * (2.4 GHz) band.
 169  */
 170
 171 static s32 expected_tpt_legacy[RATE_COUNT] = {
 172         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 173 };
 174
 175 static s32 expected_tpt_siso20MHz[4][RATE_COUNT] = {
 176         {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202},  /* Norm */
 177         {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210},  /* SGI */
 178         {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381},  /* AGG */
 179         {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
 180 };
 181
 182 static s32 expected_tpt_siso40MHz[4][RATE_COUNT] = {
 183         {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 184         {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 185         {0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
 186         {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683},        /* AGG+SGI */
 187 };
 188
 189 static s32 expected_tpt_mimo2_20MHz[4][RATE_COUNT] = {
 190         {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
 191         {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
 192         {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
 193         {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660},        /* AGG+SGI */
 194 };
 195
 196 static s32 expected_tpt_mimo2_40MHz[4][RATE_COUNT] = {
 197         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289},        /* Norm */
 198         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293},        /* SGI */
 199         {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922},        /* AGG */
 200         {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966},        /* AGG+SGI */
 201 };
 202
 203 /* mbps, mcs */
 204 static const struct il_rate_mcs_info il_rate_mcs[RATE_COUNT] = {
 205         {"1", "BPSK DSSS"},
 206         {"2", "QPSK DSSS"},
 207         {"5.5", "BPSK CCK"},
 208         {"11", "QPSK CCK"},
 209         {"6", "BPSK 1/2"},
 210         {"9", "BPSK 1/2"},
 211         {"12", "QPSK 1/2"},
 212         {"18", "QPSK 3/4"},
 213         {"24", "16QAM 1/2"},
 214         {"36", "16QAM 3/4"},
 215         {"48", "64QAM 2/3"},
 216         {"54", "64QAM 3/4"},
 217         {"60", "64QAM 5/6"},
 218 };
 219
 220 #define MCS_IDX_PER_STREAM      (8)
 221
 222 static inline u8
 223 il4965_rs_extract_rate(u32 rate_n_flags)
 224 {
 225         return (u8) (rate_n_flags & 0xFF);
 226 }
 227
 228 static void
 229 il4965_rs_rate_scale_clear_win(struct il_rate_scale_data *win)
 230 {
 231         win->data = 0;
 232         win->success_counter = 0;
 233         win->success_ratio = IL_INVALID_VALUE;
 234         win->counter = 0;
 235         win->average_tpt = IL_INVALID_VALUE;
 236         win->stamp = 0;
 237 }
 238
 239 static inline u8
 240 il4965_rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 241 {
 242         return (ant_type & valid_antenna) == ant_type;
 243 }
 244
 245 /*
 246  *      removes the old data from the stats. All data that is older than
 247  *      TID_MAX_TIME_DIFF, will be deleted.
 248  */
 249 static void
 250 il4965_rs_tl_rm_old_stats(struct il_traffic_load *tl, u32 curr_time)
 251 {
 252         /* The oldest age we want to keep */
 253         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 254
 255         while (tl->queue_count && tl->time_stamp < oldest_time) {
 256                 tl->total -= tl->packet_count[tl->head];
 257                 tl->packet_count[tl->head] = 0;
 258                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 259                 tl->queue_count--;
 260                 tl->head++;
 261                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 262                         tl->head = 0;
 263         }
 264 }
 265
 266 /*
 267  *      increment traffic load value for tid and also remove
 268  *      any old values if passed the certain time period
 269  */
 270 static u8
 271 il4965_rs_tl_add_packet(struct il_lq_sta *lq_data, struct ieee80211_hdr *hdr)
 272 {
 273         u32 curr_time = jiffies_to_msecs(jiffies);
 274         u32 time_diff;
 275         s32 idx;
 276         struct il_traffic_load *tl = NULL;
 277         u8 tid;
 278
 279         if (ieee80211_is_data_qos(hdr->frame_control)) {
 280                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 281                 tid = qc[0] & 0xf;
 282         } else
 283                 return MAX_TID_COUNT;
 284
 285         if (unlikely(tid >= TID_MAX_LOAD_COUNT))
 286                 return MAX_TID_COUNT;
 287
 288         tl = &lq_data->load[tid];
 289
 290         curr_time -= curr_time % TID_ROUND_VALUE;
 291
 292         /* Happens only for the first packet. Initialize the data */
 293         if (!(tl->queue_count)) {
 294                 tl->total = 1;
 295                 tl->time_stamp = curr_time;
 296                 tl->queue_count = 1;
 297                 tl->head = 0;
 298                 tl->packet_count[0] = 1;
 299                 return MAX_TID_COUNT;
 300         }
 301
 302         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 303         idx = time_diff / TID_QUEUE_CELL_SPACING;
 304
 305         /* The history is too long: remove data that is older than */
 306         /* TID_MAX_TIME_DIFF */
 307         if (idx >= TID_QUEUE_MAX_SIZE)
 308                 il4965_rs_tl_rm_old_stats(tl, curr_time);
 309
 310         idx = (tl->head + idx) % TID_QUEUE_MAX_SIZE;
 311         tl->packet_count[idx] = tl->packet_count[idx] + 1;
 312         tl->total = tl->total + 1;
 313
 314         if ((idx + 1) > tl->queue_count)
 315                 tl->queue_count = idx + 1;
 316
 317         return tid;
 318 }
 319
 320 /*
 321         get the traffic load value for tid
 322 */
 323 static u32
 324 il4965_rs_tl_get_load(struct il_lq_sta *lq_data, u8 tid)
 325 {
 326         u32 curr_time = jiffies_to_msecs(jiffies);
 327         u32 time_diff;
 328         s32 idx;
 329         struct il_traffic_load *tl = NULL;
 330
 331         if (tid >= TID_MAX_LOAD_COUNT)
 332                 return 0;
 333
 334         tl = &(lq_data->load[tid]);
 335
 336         curr_time -= curr_time % TID_ROUND_VALUE;
 337
 338         if (!(tl->queue_count))
 339                 return 0;
 340
 341         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 342         idx = time_diff / TID_QUEUE_CELL_SPACING;
 343
 344         /* The history is too long: remove data that is older than */
 345         /* TID_MAX_TIME_DIFF */
 346         if (idx >= TID_QUEUE_MAX_SIZE)
 347                 il4965_rs_tl_rm_old_stats(tl, curr_time);
 348
 349         return tl->total;
 350 }
 351
 352 static int
 353 il4965_rs_tl_turn_on_agg_for_tid(struct il_priv *il, struct il_lq_sta *lq_data,
 354                                  u8 tid, struct ieee80211_sta *sta)
 355 {
 356         int ret = -EAGAIN;
 357         u32 load;
 358
 359         load = il4965_rs_tl_get_load(lq_data, tid);
 360
 361         if (load > IL_AGG_LOAD_THRESHOLD) {
 362                 D_HT("Starting Tx agg: STA: %pM tid: %d\n", sta->addr, tid);
 363                 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 364                 if (ret == -EAGAIN) {
 365                         /*
 366                          * driver and mac80211 is out of sync
 367                          * this might be cause by reloading firmware
 368                          * stop the tx ba session here
 369                          */
 370                         IL_ERR("Fail start Tx agg on tid: %d\n", tid);
 371                         ieee80211_stop_tx_ba_session(sta, tid);
 372                 }
 373         } else
 374                 D_HT("Aggregation not enabled for tid %d because load = %u\n",
 375                      tid, load);
 376
 377         return ret;
 378 }
 379
 380 static void
 381 il4965_rs_tl_turn_on_agg(struct il_priv *il, u8 tid, struct il_lq_sta *lq_data,
 382                          struct ieee80211_sta *sta)
 383 {
 384         if (tid < TID_MAX_LOAD_COUNT)
 385                 il4965_rs_tl_turn_on_agg_for_tid(il, lq_data, tid, sta);
 386         else
 387                 IL_ERR("tid exceeds max load count: %d/%d\n", tid,
 388                        TID_MAX_LOAD_COUNT);
 389 }
 390
 391 static inline int
 392 il4965_get_il4965_num_of_ant_from_rate(u32 rate_n_flags)
 393 {
 394         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 395             !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 396             !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 397 }
 398
 399 /*
 400  * Static function to get the expected throughput from an il_scale_tbl_info
 401  * that wraps a NULL pointer check
 402  */
 403 static s32
 404 il4965_get_expected_tpt(struct il_scale_tbl_info *tbl, int rs_idx)
 405 {
 406         if (tbl->expected_tpt)
 407                 return tbl->expected_tpt[rs_idx];
 408         return 0;
 409 }
 410
 411 /**
 412  * il4965_rs_collect_tx_data - Update the success/failure sliding win
 413  *
 414  * We keep a sliding win of the last 62 packets transmitted
 415  * at this rate.  win->data contains the bitmask of successful
 416  * packets.
 417  */
 418 static int
 419 il4965_rs_collect_tx_data(struct il_scale_tbl_info *tbl, int scale_idx,
 420                           int attempts, int successes)
 421 {
 422         struct il_rate_scale_data *win = NULL;
 423         static const u64 mask = (((u64) 1) << (RATE_MAX_WINDOW - 1));
 424         s32 fail_count, tpt;
 425
 426         if (scale_idx < 0 || scale_idx >= RATE_COUNT)
 427                 return -EINVAL;
 428
 429         /* Select win for current tx bit rate */
 430         win = &(tbl->win[scale_idx]);
 431
 432         /* Get expected throughput */
 433         tpt = il4965_get_expected_tpt(tbl, scale_idx);
 434
 435         /*
 436          * Keep track of only the latest 62 tx frame attempts in this rate's
 437          * history win; anything older isn't really relevant any more.
 438          * If we have filled up the sliding win, drop the oldest attempt;
 439          * if the oldest attempt (highest bit in bitmap) shows "success",
 440          * subtract "1" from the success counter (this is the main reason
 441          * we keep these bitmaps!).
 442          */
 443         while (attempts > 0) {
 444                 if (win->counter >= RATE_MAX_WINDOW) {
 445
 446                         /* remove earliest */
 447                         win->counter = RATE_MAX_WINDOW - 1;
 448
 449                         if (win->data & mask) {
 450                                 win->data &= ~mask;
 451                                 win->success_counter--;
 452                         }
 453                 }
 454
 455                 /* Increment frames-attempted counter */
 456                 win->counter++;
 457
 458                 /* Shift bitmap by one frame to throw away oldest history */
 459                 win->data <<= 1;
 460
 461                 /* Mark the most recent #successes attempts as successful */
 462                 if (successes > 0) {
 463                         win->success_counter++;
 464                         win->data |= 0x1;
 465                         successes--;
 466                 }
 467
 468                 attempts--;
 469         }
 470
 471         /* Calculate current success ratio, avoid divide-by-0! */
 472         if (win->counter > 0)
 473                 win->success_ratio =
 474                     128 * (100 * win->success_counter) / win->counter;
 475         else
 476                 win->success_ratio = IL_INVALID_VALUE;
 477
 478         fail_count = win->counter - win->success_counter;
 479
 480         /* Calculate average throughput, if we have enough history. */
 481         if (fail_count >= RATE_MIN_FAILURE_TH ||
 482             win->success_counter >= RATE_MIN_SUCCESS_TH)
 483                 win->average_tpt = (win->success_ratio * tpt + 64) / 128;
 484         else
 485                 win->average_tpt = IL_INVALID_VALUE;
 486
 487         /* Tag this win as having been updated */
 488         win->stamp = jiffies;
 489
 490         return 0;
 491 }
 492
 493 /*
 494  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 495  */
 496 static u32
 497 il4965_rate_n_flags_from_tbl(struct il_priv *il, struct il_scale_tbl_info *tbl,
 498                              int idx, u8 use_green)
 499 {
 500         u32 rate_n_flags = 0;
 501
 502         if (is_legacy(tbl->lq_type)) {
 503                 rate_n_flags = il_rates[idx].plcp;
 504                 if (idx >= IL_FIRST_CCK_RATE && idx <= IL_LAST_CCK_RATE)
 505                         rate_n_flags |= RATE_MCS_CCK_MSK;
 506
 507         } else if (is_Ht(tbl->lq_type)) {
 508                 if (idx > IL_LAST_OFDM_RATE) {
 509                         IL_ERR("Invalid HT rate idx %d\n", idx);
 510                         idx = IL_LAST_OFDM_RATE;
 511                 }
 512                 rate_n_flags = RATE_MCS_HT_MSK;
 513
 514                 if (is_siso(tbl->lq_type))
 515                         rate_n_flags |= il_rates[idx].plcp_siso;
 516                 else
 517                         rate_n_flags |= il_rates[idx].plcp_mimo2;
 518         } else {
 519                 IL_ERR("Invalid tbl->lq_type %d\n", tbl->lq_type);
 520         }
 521
 522         rate_n_flags |=
 523             ((tbl->ant_type << RATE_MCS_ANT_POS) & RATE_MCS_ANT_ABC_MSK);
 524
 525         if (is_Ht(tbl->lq_type)) {
 526                 if (tbl->is_ht40) {
 527                         if (tbl->is_dup)
 528                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 529                         else
 530                                 rate_n_flags |= RATE_MCS_HT40_MSK;
 531                 }
 532                 if (tbl->is_SGI)
 533                         rate_n_flags |= RATE_MCS_SGI_MSK;
 534
 535                 if (use_green) {
 536                         rate_n_flags |= RATE_MCS_GF_MSK;
 537                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 538                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 539                                 IL_ERR("GF was set with SGI:SISO\n");
 540                         }
 541                 }
 542         }
 543         return rate_n_flags;
 544 }
 545
 546 /*
 547  * Interpret uCode API's rate_n_flags format,
 548  * fill "search" or "active" tx mode table.
 549  */
 550 static int
 551 il4965_rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 552                                 enum ieee80211_band band,
 553                                 struct il_scale_tbl_info *tbl, int *rate_idx)
 554 {
 555         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 556         u8 il4965_num_of_ant =
 557             il4965_get_il4965_num_of_ant_from_rate(rate_n_flags);
 558         u8 mcs;
 559
 560         memset(tbl, 0, sizeof(struct il_scale_tbl_info));
 561         *rate_idx = il4965_hwrate_to_plcp_idx(rate_n_flags);
 562
 563         if (*rate_idx == RATE_INVALID) {
 564                 *rate_idx = -1;
 565                 return -EINVAL;
 566         }
 567         tbl->is_SGI = 0;        /* default legacy setup */
 568         tbl->is_ht40 = 0;
 569         tbl->is_dup = 0;
 570         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 571         tbl->lq_type = LQ_NONE;
 572         tbl->max_search = IL_MAX_SEARCH;
 573
 574         /* legacy rate format */
 575         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 576                 if (il4965_num_of_ant == 1) {
 577                         if (band == IEEE80211_BAND_5GHZ)
 578                                 tbl->lq_type = LQ_A;
 579                         else
 580                                 tbl->lq_type = LQ_G;
 581                 }
 582                 /* HT rate format */
 583         } else {
 584                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 585                         tbl->is_SGI = 1;
 586
 587                 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
 588                     (rate_n_flags & RATE_MCS_DUP_MSK))
 589                         tbl->is_ht40 = 1;
 590
 591                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 592                         tbl->is_dup = 1;
 593
 594                 mcs = il4965_rs_extract_rate(rate_n_flags);
 595
 596                 /* SISO */
 597                 if (mcs <= RATE_SISO_60M_PLCP) {
 598                         if (il4965_num_of_ant == 1)
 599                                 tbl->lq_type = LQ_SISO; /*else NONE */
 600                         /* MIMO2 */
 601                 } else {
 602                         if (il4965_num_of_ant == 2)
 603                                 tbl->lq_type = LQ_MIMO2;
 604                 }
 605         }
 606         return 0;
 607 }
 608
 609 /* switch to another antenna/antennas and return 1 */
 610 /* if no other valid antenna found, return 0 */
 611 static int
 612 il4965_rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 613                          struct il_scale_tbl_info *tbl)
 614 {
 615         u8 new_ant_type;
 616
 617         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 618                 return 0;
 619
 620         if (!il4965_rs_is_valid_ant(valid_ant, tbl->ant_type))
 621                 return 0;
 622
 623         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 624
 625         while (new_ant_type != tbl->ant_type &&
 626                !il4965_rs_is_valid_ant(valid_ant, new_ant_type))
 627                 new_ant_type = ant_toggle_lookup[new_ant_type];
 628
 629         if (new_ant_type == tbl->ant_type)
 630                 return 0;
 631
 632         tbl->ant_type = new_ant_type;
 633         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 634         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 635         return 1;
 636 }
 637
 638 /**
 639  * Green-field mode is valid if the station supports it and
 640  * there are no non-GF stations present in the BSS.
 641  */
 642 static bool
 643 il4965_rs_use_green(struct il_priv *il, struct ieee80211_sta *sta)
 644 {
 645         return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
 646                !il->ht.non_gf_sta_present;
 647 }
 648
 649 /**
 650  * il4965_rs_get_supported_rates - get the available rates
 651  *
 652  * if management frame or broadcast frame only return
 653  * basic available rates.
 654  *
 655  */
 656 static u16
 657 il4965_rs_get_supported_rates(struct il_lq_sta *lq_sta,
 658                               struct ieee80211_hdr *hdr,
 659                               enum il_table_type rate_type)
 660 {
 661         if (is_legacy(rate_type)) {
 662                 return lq_sta->active_legacy_rate;
 663         } else {
 664                 if (is_siso(rate_type))
 665                         return lq_sta->active_siso_rate;
 666                 else
 667                         return lq_sta->active_mimo2_rate;
 668         }
 669 }
 670
 671 static u16
 672 il4965_rs_get_adjacent_rate(struct il_priv *il, u8 idx, u16 rate_mask,
 673                             int rate_type)
 674 {
 675         u8 high = RATE_INVALID;
 676         u8 low = RATE_INVALID;
 677
 678         /* 802.11A or ht walks to the next literal adjacent rate in
 679          * the rate table */
 680         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 681                 int i;
 682                 u32 mask;
 683
 684                 /* Find the previous rate that is in the rate mask */
 685                 i = idx - 1;
 686                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 687                         if (rate_mask & mask) {
 688                                 low = i;
 689                                 break;
 690                         }
 691                 }
 692
 693                 /* Find the next rate that is in the rate mask */
 694                 i = idx + 1;
 695                 for (mask = (1 << i); i < RATE_COUNT; i++, mask <<= 1) {
 696                         if (rate_mask & mask) {
 697                                 high = i;
 698                                 break;
 699                         }
 700                 }
 701
 702                 return (high << 8) | low;
 703         }
 704
 705         low = idx;
 706         while (low != RATE_INVALID) {
 707                 low = il_rates[low].prev_rs;
 708                 if (low == RATE_INVALID)
 709                         break;
 710                 if (rate_mask & (1 << low))
 711                         break;
 712                 D_RATE("Skipping masked lower rate: %d\n", low);
 713         }
 714
 715         high = idx;
 716         while (high != RATE_INVALID) {
 717                 high = il_rates[high].next_rs;
 718                 if (high == RATE_INVALID)
 719                         break;
 720                 if (rate_mask & (1 << high))
 721                         break;
 722                 D_RATE("Skipping masked higher rate: %d\n", high);
 723         }
 724
 725         return (high << 8) | low;
 726 }
 727
 728 static u32
 729 il4965_rs_get_lower_rate(struct il_lq_sta *lq_sta,
 730                          struct il_scale_tbl_info *tbl, u8 scale_idx,
 731                          u8 ht_possible)
 732 {
 733         s32 low;
 734         u16 rate_mask;
 735         u16 high_low;
 736         u8 switch_to_legacy = 0;
 737         u8 is_green = lq_sta->is_green;
 738         struct il_priv *il = lq_sta->drv;
 739
 740         /* check if we need to switch from HT to legacy rates.
 741          * assumption is that mandatory rates (1Mbps or 6Mbps)
 742          * are always supported (spec demand) */
 743         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_idx)) {
 744                 switch_to_legacy = 1;
 745                 scale_idx = rs_ht_to_legacy[scale_idx];
 746                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 747                         tbl->lq_type = LQ_A;
 748                 else
 749                         tbl->lq_type = LQ_G;
 750
 751                 if (il4965_num_of_ant(tbl->ant_type) > 1)
 752                         tbl->ant_type =
 753                             il4965_first_antenna(il->hw_params.valid_tx_ant);
 754
 755                 tbl->is_ht40 = 0;
 756                 tbl->is_SGI = 0;
 757                 tbl->max_search = IL_MAX_SEARCH;
 758         }
 759
 760         rate_mask = il4965_rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 761
 762         /* Mask with station rate restriction */
 763         if (is_legacy(tbl->lq_type)) {
 764                 /* supp_rates has no CCK bits in A mode */
 765                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 766                         rate_mask =
 767                             (u16) (rate_mask &
 768                                    (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
 769                 else
 770                         rate_mask = (u16) (rate_mask & lq_sta->supp_rates);
 771         }
 772
 773         /* If we switched from HT to legacy, check current rate */
 774         if (switch_to_legacy && (rate_mask & (1 << scale_idx))) {
 775                 low = scale_idx;
 776                 goto out;
 777         }
 778
 779         high_low =
 780             il4965_rs_get_adjacent_rate(lq_sta->drv, scale_idx, rate_mask,
 781                                         tbl->lq_type);
 782         low = high_low & 0xff;
 783
 784         if (low == RATE_INVALID)
 785                 low = scale_idx;
 786
 787 out:
 788         return il4965_rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 789 }
 790
 791 /*
 792  * Simple function to compare two rate scale table types
 793  */
 794 static bool
 795 il4965_table_type_matches(struct il_scale_tbl_info *a,
 796                           struct il_scale_tbl_info *b)
 797 {
 798         return (a->lq_type == b->lq_type && a->ant_type == b->ant_type &&
 799                 a->is_SGI == b->is_SGI);
 800 }
 801
 802 /*
 803  * mac80211 sends us Tx status
 804  */
 805 static void
 806 il4965_rs_tx_status(void *il_r, struct ieee80211_supported_band *sband,
 807                     struct ieee80211_sta *sta, void *il_sta,
 808                     struct sk_buff *skb)
 809 {
 810         int legacy_success;
 811         int retries;
 812         int rs_idx, mac_idx, i;
 813         struct il_lq_sta *lq_sta = il_sta;
 814         struct il_link_quality_cmd *table;
 815         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 816         struct il_priv *il = (struct il_priv *)il_r;
 817         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 818         enum mac80211_rate_control_flags mac_flags;
 819         u32 tx_rate;
 820         struct il_scale_tbl_info tbl_type;
 821         struct il_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 822
 823         D_RATE("get frame ack response, update rate scale win\n");
 824
 825         /* Treat uninitialized rate scaling data same as non-existing. */
 826         if (!lq_sta) {
 827                 D_RATE("Station rate scaling not created yet.\n");
 828                 return;
 829         } else if (!lq_sta->drv) {
 830                 D_RATE("Rate scaling not initialized yet.\n");
 831                 return;
 832         }
 833
 834         if (!ieee80211_is_data(hdr->frame_control) ||
 835             (info->flags & IEEE80211_TX_CTL_NO_ACK))
 836                 return;
 837
 838         /* This packet was aggregated but doesn't carry status info */
 839         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 840             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 841                 return;
 842
 843         /*
 844          * Ignore this Tx frame response if its initial rate doesn't match
 845          * that of latest Link Quality command.  There may be stragglers
 846          * from a previous Link Quality command, but we're no longer interested
 847          * in those; they're either from the "active" mode while we're trying
 848          * to check "search" mode, or a prior "search" mode after we've moved
 849          * to a new "search" mode (which might become the new "active" mode).
 850          */
 851         table = &lq_sta->lq;
 852         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 853         il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type, &rs_idx);
 854         if (il->band == IEEE80211_BAND_5GHZ)
 855                 rs_idx -= IL_FIRST_OFDM_RATE;
 856         mac_flags = info->status.rates[0].flags;
 857         mac_idx = info->status.rates[0].idx;
 858         /* For HT packets, map MCS to PLCP */
 859         if (mac_flags & IEEE80211_TX_RC_MCS) {
 860                 mac_idx &= RATE_MCS_CODE_MSK;   /* Remove # of streams */
 861                 if (mac_idx >= (RATE_9M_IDX - IL_FIRST_OFDM_RATE))
 862                         mac_idx++;
 863                 /*
 864                  * mac80211 HT idx is always zero-idxed; we need to move
 865                  * HT OFDM rates after CCK rates in 2.4 GHz band
 866                  */
 867                 if (il->band == IEEE80211_BAND_2GHZ)
 868                         mac_idx += IL_FIRST_OFDM_RATE;
 869         }
 870         /* Here we actually compare this rate to the latest LQ command */
 871         if (mac_idx < 0 ||
 872             tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI) ||
 873             tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ||
 874             tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA) ||
 875             tbl_type.ant_type != info->status.antenna ||
 876             !!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)
 877             || !!(tx_rate & RATE_MCS_GF_MSK) !=
 878             !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD) || rs_idx != mac_idx) {
 879                 D_RATE("initial rate %d does not match %d (0x%x)\n", mac_idx,
 880                        rs_idx, tx_rate);
 881                 /*
 882                  * Since rates mis-match, the last LQ command may have failed.
 883                  * After IL_MISSED_RATE_MAX mis-matches, resync the uCode with
 884                  * ... driver.
 885                  */
 886                 lq_sta->missed_rate_counter++;
 887                 if (lq_sta->missed_rate_counter > IL_MISSED_RATE_MAX) {
 888                         lq_sta->missed_rate_counter = 0;
 889                         il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
 890                 }
 891                 /* Regardless, ignore this status info for outdated rate */
 892                 return;
 893         } else
 894                 /* Rate did match, so reset the missed_rate_counter */
 895                 lq_sta->missed_rate_counter = 0;
 896
 897         /* Figure out if rate scale algorithm is in active or search table */
 898         if (il4965_table_type_matches
 899             (&tbl_type, &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 900                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 901                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 902         } else
 903             if (il4965_table_type_matches
 904                 (&tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
 905                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 906                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 907         } else {
 908                 D_RATE("Neither active nor search matches tx rate\n");
 909                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 910                 D_RATE("active- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
 911                        tmp_tbl->ant_type, tmp_tbl->is_SGI);
 912                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 913                 D_RATE("search- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
 914                        tmp_tbl->ant_type, tmp_tbl->is_SGI);
 915                 D_RATE("actual- lq:%x, ant:%x, SGI:%d\n", tbl_type.lq_type,
 916                        tbl_type.ant_type, tbl_type.is_SGI);
 917                 /*
 918                  * no matching table found, let's by-pass the data collection
 919                  * and continue to perform rate scale to find the rate table
 920                  */
 921                 il4965_rs_stay_in_table(lq_sta, true);
 922                 goto done;
 923         }
 924
 925         /*
 926          * Updating the frame history depends on whether packets were
 927          * aggregated.
 928          *
 929          * For aggregation, all packets were transmitted at the same rate, the
 930          * first idx into rate scale table.
 931          */
 932         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
 933                 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 934                 il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type,
 935                                                 &rs_idx);
 936                 il4965_rs_collect_tx_data(curr_tbl, rs_idx,
 937                                           info->status.ampdu_len,
 938                                           info->status.ampdu_ack_len);
 939
 940                 /* Update success/fail counts if not searching for new mode */
 941                 if (lq_sta->stay_in_tbl) {
 942                         lq_sta->total_success += info->status.ampdu_ack_len;
 943                         lq_sta->total_failed +=
 944                             (info->status.ampdu_len -
 945                              info->status.ampdu_ack_len);
 946                 }
 947         } else {
 948                 /*
 949                  * For legacy, update frame history with for each Tx retry.
 950                  */
 951                 retries = info->status.rates[0].count - 1;
 952                 /* HW doesn't send more than 15 retries */
 953                 retries = min(retries, 15);
 954
 955                 /* The last transmission may have been successful */
 956                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
 957                 /* Collect data for each rate used during failed TX attempts */
 958                 for (i = 0; i <= retries; ++i) {
 959                         tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
 960                         il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band,
 961                                                         &tbl_type, &rs_idx);
 962                         /*
 963                          * Only collect stats if retried rate is in the same RS
 964                          * table as active/search.
 965                          */
 966                         if (il4965_table_type_matches(&tbl_type, curr_tbl))
 967                                 tmp_tbl = curr_tbl;
 968                         else if (il4965_table_type_matches
 969                                  (&tbl_type, other_tbl))
 970                                 tmp_tbl = other_tbl;
 971                         else
 972                                 continue;
 973                         il4965_rs_collect_tx_data(tmp_tbl, rs_idx, 1,
 974                                                   i <
 975                                                   retries ? 0 : legacy_success);
 976                 }
 977
 978                 /* Update success/fail counts if not searching for new mode */
 979                 if (lq_sta->stay_in_tbl) {
 980                         lq_sta->total_success += legacy_success;
 981                         lq_sta->total_failed += retries + (1 - legacy_success);
 982                 }
 983         }
 984         /* The last TX rate is cached in lq_sta; it's set in if/else above */
 985         lq_sta->last_rate_n_flags = tx_rate;
 986 done:
 987         /* See if there's a better rate or modulation mode to try. */
 988         if (sta->supp_rates[sband->band])
 989                 il4965_rs_rate_scale_perform(il, skb, sta, lq_sta);
 990 }
 991
 992 /*
 993  * Begin a period of staying with a selected modulation mode.
 994  * Set "stay_in_tbl" flag to prevent any mode switches.
 995  * Set frame tx success limits according to legacy vs. high-throughput,
 996  * and reset overall (spanning all rates) tx success history stats.
 997  * These control how long we stay using same modulation mode before
 998  * searching for a new mode.
 999  */
1000 static void
1001 il4965_rs_set_stay_in_table(struct il_priv *il, u8 is_legacy,
1002                             struct il_lq_sta *lq_sta)
1003 {
1004         D_RATE("we are staying in the same table\n");
1005         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1006         if (is_legacy) {
1007                 lq_sta->table_count_limit = IL_LEGACY_TBL_COUNT;
1008                 lq_sta->max_failure_limit = IL_LEGACY_FAILURE_LIMIT;
1009                 lq_sta->max_success_limit = IL_LEGACY_SUCCESS_LIMIT;
1010         } else {
1011                 lq_sta->table_count_limit = IL_NONE_LEGACY_TBL_COUNT;
1012                 lq_sta->max_failure_limit = IL_NONE_LEGACY_FAILURE_LIMIT;
1013                 lq_sta->max_success_limit = IL_NONE_LEGACY_SUCCESS_LIMIT;
1014         }
1015         lq_sta->table_count = 0;
1016         lq_sta->total_failed = 0;
1017         lq_sta->total_success = 0;
1018         lq_sta->flush_timer = jiffies;
1019         lq_sta->action_counter = 0;
1020 }
1021
1022 /*
1023  * Find correct throughput table for given mode of modulation
1024  */
1025 static void
1026 il4965_rs_set_expected_tpt_table(struct il_lq_sta *lq_sta,
1027                                  struct il_scale_tbl_info *tbl)
1028 {
1029         /* Used to choose among HT tables */
1030         s32(*ht_tbl_pointer)[RATE_COUNT];
1031
1032         /* Check for invalid LQ type */
1033         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1034                 tbl->expected_tpt = expected_tpt_legacy;
1035                 return;
1036         }
1037
1038         /* Legacy rates have only one table */
1039         if (is_legacy(tbl->lq_type)) {
1040                 tbl->expected_tpt = expected_tpt_legacy;
1041                 return;
1042         }
1043
1044         /* Choose among many HT tables depending on number of streams
1045          * (SISO/MIMO2), channel width (20/40), SGI, and aggregation
1046          * status */
1047         if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1048                 ht_tbl_pointer = expected_tpt_siso20MHz;
1049         else if (is_siso(tbl->lq_type))
1050                 ht_tbl_pointer = expected_tpt_siso40MHz;
1051         else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1052                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1053         else                    /* if (is_mimo2(tbl->lq_type)) <-- must be true */
1054                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1055
1056         if (!tbl->is_SGI && !lq_sta->is_agg)    /* Normal */
1057                 tbl->expected_tpt = ht_tbl_pointer[0];
1058         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1059                 tbl->expected_tpt = ht_tbl_pointer[1];
1060         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1061                 tbl->expected_tpt = ht_tbl_pointer[2];
1062         else                    /* AGG+SGI */
1063                 tbl->expected_tpt = ht_tbl_pointer[3];
1064 }
1065
1066 /*
1067  * Find starting rate for new "search" high-throughput mode of modulation.
1068  * Goal is to find lowest expected rate (under perfect conditions) that is
1069  * above the current measured throughput of "active" mode, to give new mode
1070  * a fair chance to prove itself without too many challenges.
1071  *
1072  * This gets called when transitioning to more aggressive modulation
1073  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1074  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1075  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1076  * bit rate will typically need to increase, but not if performance was bad.
1077  */
1078 static s32
1079 il4965_rs_get_best_rate(struct il_priv *il, struct il_lq_sta *lq_sta,
1080                         struct il_scale_tbl_info *tbl,  /* "search" */
1081                         u16 rate_mask, s8 idx)
1082 {
1083         /* "active" values */
1084         struct il_scale_tbl_info *active_tbl =
1085             &(lq_sta->lq_info[lq_sta->active_tbl]);
1086         s32 active_sr = active_tbl->win[idx].success_ratio;
1087         s32 active_tpt = active_tbl->expected_tpt[idx];
1088
1089         /* expected "search" throughput */
1090         s32 *tpt_tbl = tbl->expected_tpt;
1091
1092         s32 new_rate, high, low, start_hi;
1093         u16 high_low;
1094         s8 rate = idx;
1095
1096         new_rate = high = low = start_hi = RATE_INVALID;
1097
1098         for (;;) {
1099                 high_low =
1100                     il4965_rs_get_adjacent_rate(il, rate, rate_mask,
1101                                                 tbl->lq_type);
1102
1103                 low = high_low & 0xff;
1104                 high = (high_low >> 8) & 0xff;
1105
1106                 /*
1107                  * Lower the "search" bit rate, to give new "search" mode
1108                  * approximately the same throughput as "active" if:
1109                  *
1110                  * 1) "Active" mode has been working modestly well (but not
1111                  *    great), and expected "search" throughput (under perfect
1112                  *    conditions) at candidate rate is above the actual
1113                  *    measured "active" throughput (but less than expected
1114                  *    "active" throughput under perfect conditions).
1115                  * OR
1116                  * 2) "Active" mode has been working perfectly or very well
1117                  *    and expected "search" throughput (under perfect
1118                  *    conditions) at candidate rate is above expected
1119                  *    "active" throughput (under perfect conditions).
1120                  */
1121                 if ((100 * tpt_tbl[rate] > lq_sta->last_tpt &&
1122                      (active_sr > RATE_DECREASE_TH && active_sr <= RATE_HIGH_TH
1123                       && tpt_tbl[rate] <= active_tpt)) ||
1124                     (active_sr >= RATE_SCALE_SWITCH &&
1125                      tpt_tbl[rate] > active_tpt)) {
1126
1127                         /* (2nd or later pass)
1128                          * If we've already tried to raise the rate, and are
1129                          * now trying to lower it, use the higher rate. */
1130                         if (start_hi != RATE_INVALID) {
1131                                 new_rate = start_hi;
1132                                 break;
1133                         }
1134
1135                         new_rate = rate;
1136
1137                         /* Loop again with lower rate */
1138                         if (low != RATE_INVALID)
1139                                 rate = low;
1140
1141                         /* Lower rate not available, use the original */
1142                         else
1143                                 break;
1144
1145                         /* Else try to raise the "search" rate to match "active" */
1146                 } else {
1147                         /* (2nd or later pass)
1148                          * If we've already tried to lower the rate, and are
1149                          * now trying to raise it, use the lower rate. */
1150                         if (new_rate != RATE_INVALID)
1151                                 break;
1152
1153                         /* Loop again with higher rate */
1154                         else if (high != RATE_INVALID) {
1155                                 start_hi = high;
1156                                 rate = high;
1157
1158                                 /* Higher rate not available, use the original */
1159                         } else {
1160                                 new_rate = rate;
1161                                 break;
1162                         }
1163                 }
1164         }
1165
1166         return new_rate;
1167 }
1168
1169 /*
1170  * Set up search table for MIMO2
1171  */
1172 static int
1173 il4965_rs_switch_to_mimo2(struct il_priv *il, struct il_lq_sta *lq_sta,
1174                           struct ieee80211_conf *conf,
1175                           struct ieee80211_sta *sta,
1176                           struct il_scale_tbl_info *tbl, int idx)
1177 {
1178         u16 rate_mask;
1179         s32 rate;
1180         s8 is_green = lq_sta->is_green;
1181
1182         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1183                 return -1;
1184
1185         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1186                 return -1;
1187
1188         /* Need both Tx chains/antennas to support MIMO */
1189         if (il->hw_params.tx_chains_num < 2)
1190                 return -1;
1191
1192         D_RATE("LQ: try to switch to MIMO2\n");
1193
1194         tbl->lq_type = LQ_MIMO2;
1195         tbl->is_dup = lq_sta->is_dup;
1196         tbl->action = 0;
1197         tbl->max_search = IL_MAX_SEARCH;
1198         rate_mask = lq_sta->active_mimo2_rate;
1199
1200         if (il_is_ht40_tx_allowed(il, &sta->ht_cap))
1201                 tbl->is_ht40 = 1;
1202         else
1203                 tbl->is_ht40 = 0;
1204
1205         il4965_rs_set_expected_tpt_table(lq_sta, tbl);
1206
1207         rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
1208
1209         D_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1210         if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
1211                 D_RATE("Can't switch with idx %d rate mask %x\n", rate,
1212                        rate_mask);
1213                 return -1;
1214         }
1215         tbl->current_rate =
1216             il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
1217
1218         D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
1219                is_green);
1220         return 0;
1221 }
1222
1223 /*
1224  * Set up search table for SISO
1225  */
1226 static int
1227 il4965_rs_switch_to_siso(struct il_priv *il, struct il_lq_sta *lq_sta,
1228                          struct ieee80211_conf *conf, struct ieee80211_sta *sta,
1229                          struct il_scale_tbl_info *tbl, int idx)
1230 {
1231         u16 rate_mask;
1232         u8 is_green = lq_sta->is_green;
1233         s32 rate;
1234
1235         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1236                 return -1;
1237
1238         D_RATE("LQ: try to switch to SISO\n");
1239
1240         tbl->is_dup = lq_sta->is_dup;
1241         tbl->lq_type = LQ_SISO;
1242         tbl->action = 0;
1243         tbl->max_search = IL_MAX_SEARCH;
1244         rate_mask = lq_sta->active_siso_rate;
1245
1246         if (il_is_ht40_tx_allowed(il, &sta->ht_cap))
1247                 tbl->is_ht40 = 1;
1248         else
1249                 tbl->is_ht40 = 0;
1250
1251         if (is_green)
1252                 tbl->is_SGI = 0;        /*11n spec: no SGI in SISO+Greenfield */
1253
1254         il4965_rs_set_expected_tpt_table(lq_sta, tbl);
1255         rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
1256
1257         D_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1258         if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
1259                 D_RATE("can not switch with idx %d rate mask %x\n", rate,
1260                        rate_mask);
1261                 return -1;
1262         }
1263         tbl->current_rate =
1264             il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
1265         D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
1266                is_green);
1267         return 0;
1268 }
1269
1270 /*
1271  * Try to switch to new modulation mode from legacy
1272  */
1273 static int
1274 il4965_rs_move_legacy_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1275                             struct ieee80211_conf *conf,
1276                             struct ieee80211_sta *sta, int idx)
1277 {
1278         struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1279         struct il_scale_tbl_info *search_tbl =
1280             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1281         struct il_rate_scale_data *win = &(tbl->win[idx]);
1282         u32 sz =
1283             (sizeof(struct il_scale_tbl_info) -
1284              (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1285         u8 start_action;
1286         u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1287         u8 tx_chains_num = il->hw_params.tx_chains_num;
1288         int ret = 0;
1289         u8 update_search_tbl_counter = 0;
1290
1291         tbl->action = IL_LEGACY_SWITCH_SISO;
1292
1293         start_action = tbl->action;
1294         for (;;) {
1295                 lq_sta->action_counter++;
1296                 switch (tbl->action) {
1297                 case IL_LEGACY_SWITCH_ANTENNA1:
1298                 case IL_LEGACY_SWITCH_ANTENNA2:
1299                         D_RATE("LQ: Legacy toggle Antenna\n");
1300
1301                         if ((tbl->action == IL_LEGACY_SWITCH_ANTENNA1 &&
1302                              tx_chains_num <= 1) ||
1303                             (tbl->action == IL_LEGACY_SWITCH_ANTENNA2 &&
1304                              tx_chains_num <= 2))
1305                                 break;
1306
1307                         /* Don't change antenna if success has been great */
1308                         if (win->success_ratio >= IL_RS_GOOD_RATIO)
1309                                 break;
1310
1311                         /* Set up search table to try other antenna */
1312                         memcpy(search_tbl, tbl, sz);
1313
1314                         if (il4965_rs_toggle_antenna
1315                             (valid_tx_ant, &search_tbl->current_rate,
1316                              search_tbl)) {
1317                                 update_search_tbl_counter = 1;
1318                                 il4965_rs_set_expected_tpt_table(lq_sta,
1319                                                                  search_tbl);
1320                                 goto out;
1321                         }
1322                         break;
1323                 case IL_LEGACY_SWITCH_SISO:
1324                         D_RATE("LQ: Legacy switch to SISO\n");
1325
1326                         /* Set up search table to try SISO */
1327                         memcpy(search_tbl, tbl, sz);
1328                         search_tbl->is_SGI = 0;
1329                         ret =
1330                             il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
1331                                                      search_tbl, idx);
1332                         if (!ret) {
1333                                 lq_sta->action_counter = 0;
1334                                 goto out;
1335                         }
1336
1337                         break;
1338                 case IL_LEGACY_SWITCH_MIMO2_AB:
1339                 case IL_LEGACY_SWITCH_MIMO2_AC:
1340                 case IL_LEGACY_SWITCH_MIMO2_BC:
1341                         D_RATE("LQ: Legacy switch to MIMO2\n");
1342
1343                         /* Set up search table to try MIMO */
1344                         memcpy(search_tbl, tbl, sz);
1345                         search_tbl->is_SGI = 0;
1346
1347                         if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AB)
1348                                 search_tbl->ant_type = ANT_AB;
1349                         else if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AC)
1350                                 search_tbl->ant_type = ANT_AC;
1351                         else
1352                                 search_tbl->ant_type = ANT_BC;
1353
1354                         if (!il4965_rs_is_valid_ant
1355                             (valid_tx_ant, search_tbl->ant_type))
1356                                 break;
1357
1358                         ret =
1359                             il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
1360                                                       search_tbl, idx);
1361                         if (!ret) {
1362                                 lq_sta->action_counter = 0;
1363                                 goto out;
1364                         }
1365                         break;
1366                 }
1367                 tbl->action++;
1368                 if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
1369                         tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
1370
1371                 if (tbl->action == start_action)
1372                         break;
1373
1374         }
1375         search_tbl->lq_type = LQ_NONE;
1376         return 0;
1377
1378 out:
1379         lq_sta->search_better_tbl = 1;
1380         tbl->action++;
1381         if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
1382                 tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
1383         if (update_search_tbl_counter)
1384                 search_tbl->action = tbl->action;
1385         return 0;
1386
1387 }
1388
1389 /*
1390  * Try to switch to new modulation mode from SISO
1391  */
1392 static int
1393 il4965_rs_move_siso_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1394                              struct ieee80211_conf *conf,
1395                              struct ieee80211_sta *sta, int idx)
1396 {
1397         u8 is_green = lq_sta->is_green;
1398         struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1399         struct il_scale_tbl_info *search_tbl =
1400             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1401         struct il_rate_scale_data *win = &(tbl->win[idx]);
1402         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1403         u32 sz =
1404             (sizeof(struct il_scale_tbl_info) -
1405              (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1406         u8 start_action;
1407         u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1408         u8 tx_chains_num = il->hw_params.tx_chains_num;
1409         u8 update_search_tbl_counter = 0;
1410         int ret;
1411
1412         start_action = tbl->action;
1413
1414         for (;;) {
1415                 lq_sta->action_counter++;
1416                 switch (tbl->action) {
1417                 case IL_SISO_SWITCH_ANTENNA1:
1418                 case IL_SISO_SWITCH_ANTENNA2:
1419                         D_RATE("LQ: SISO toggle Antenna\n");
1420                         if ((tbl->action == IL_SISO_SWITCH_ANTENNA1 &&
1421                              tx_chains_num <= 1) ||
1422                             (tbl->action == IL_SISO_SWITCH_ANTENNA2 &&
1423                              tx_chains_num <= 2))
1424                                 break;
1425
1426                         if (win->success_ratio >= IL_RS_GOOD_RATIO)
1427                                 break;
1428
1429                         memcpy(search_tbl, tbl, sz);
1430                         if (il4965_rs_toggle_antenna
1431                             (valid_tx_ant, &search_tbl->current_rate,
1432                              search_tbl)) {
1433                                 update_search_tbl_counter = 1;
1434                                 goto out;
1435                         }
1436                         break;
1437                 case IL_SISO_SWITCH_MIMO2_AB:
1438                 case IL_SISO_SWITCH_MIMO2_AC:
1439                 case IL_SISO_SWITCH_MIMO2_BC:
1440                         D_RATE("LQ: SISO switch to MIMO2\n");
1441                         memcpy(search_tbl, tbl, sz);
1442                         search_tbl->is_SGI = 0;
1443
1444                         if (tbl->action == IL_SISO_SWITCH_MIMO2_AB)
1445                                 search_tbl->ant_type = ANT_AB;
1446                         else if (tbl->action == IL_SISO_SWITCH_MIMO2_AC)
1447                                 search_tbl->ant_type = ANT_AC;
1448                         else
1449                                 search_tbl->ant_type = ANT_BC;
1450
1451                         if (!il4965_rs_is_valid_ant
1452                             (valid_tx_ant, search_tbl->ant_type))
1453                                 break;
1454
1455                         ret =
1456                             il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
1457                                                       search_tbl, idx);
1458                         if (!ret)
1459                                 goto out;
1460                         break;
1461                 case IL_SISO_SWITCH_GI:
1462                         if (!tbl->is_ht40 &&
1463                             !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
1464                                 break;
1465                         if (tbl->is_ht40 &&
1466                             !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
1467                                 break;
1468
1469                         D_RATE("LQ: SISO toggle SGI/NGI\n");
1470
1471                         memcpy(search_tbl, tbl, sz);
1472                         if (is_green) {
1473                                 if (!tbl->is_SGI)
1474                                         break;
1475                                 else
1476                                         IL_ERR("SGI was set in GF+SISO\n");
1477                         }
1478                         search_tbl->is_SGI = !tbl->is_SGI;
1479                         il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1480                         if (tbl->is_SGI) {
1481                                 s32 tpt = lq_sta->last_tpt / 100;
1482                                 if (tpt >= search_tbl->expected_tpt[idx])
1483                                         break;
1484                         }
1485                         search_tbl->current_rate =
1486                             il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
1487                                                          is_green);
1488                         update_search_tbl_counter = 1;
1489                         goto out;
1490                 }
1491                 tbl->action++;
1492                 if (tbl->action > IL_SISO_SWITCH_GI)
1493                         tbl->action = IL_SISO_SWITCH_ANTENNA1;
1494
1495                 if (tbl->action == start_action)
1496                         break;
1497         }
1498         search_tbl->lq_type = LQ_NONE;
1499         return 0;
1500
1501 out:
1502         lq_sta->search_better_tbl = 1;
1503         tbl->action++;
1504         if (tbl->action > IL_SISO_SWITCH_GI)
1505                 tbl->action = IL_SISO_SWITCH_ANTENNA1;
1506         if (update_search_tbl_counter)
1507                 search_tbl->action = tbl->action;
1508
1509         return 0;
1510 }
1511
1512 /*
1513  * Try to switch to new modulation mode from MIMO2
1514  */
1515 static int
1516 il4965_rs_move_mimo2_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1517                               struct ieee80211_conf *conf,
1518                               struct ieee80211_sta *sta, int idx)
1519 {
1520         s8 is_green = lq_sta->is_green;
1521         struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1522         struct il_scale_tbl_info *search_tbl =
1523             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1524         struct il_rate_scale_data *win = &(tbl->win[idx]);
1525         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1526         u32 sz =
1527             (sizeof(struct il_scale_tbl_info) -
1528              (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1529         u8 start_action;
1530         u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1531         u8 tx_chains_num = il->hw_params.tx_chains_num;
1532         u8 update_search_tbl_counter = 0;
1533         int ret;
1534
1535         start_action = tbl->action;
1536         for (;;) {
1537                 lq_sta->action_counter++;
1538                 switch (tbl->action) {
1539                 case IL_MIMO2_SWITCH_ANTENNA1:
1540                 case IL_MIMO2_SWITCH_ANTENNA2:
1541                         D_RATE("LQ: MIMO2 toggle Antennas\n");
1542
1543                         if (tx_chains_num <= 2)
1544                                 break;
1545
1546                         if (win->success_ratio >= IL_RS_GOOD_RATIO)
1547                                 break;
1548
1549                         memcpy(search_tbl, tbl, sz);
1550                         if (il4965_rs_toggle_antenna
1551                             (valid_tx_ant, &search_tbl->current_rate,
1552                              search_tbl)) {
1553                                 update_search_tbl_counter = 1;
1554                                 goto out;
1555                         }
1556                         break;
1557                 case IL_MIMO2_SWITCH_SISO_A:
1558                 case IL_MIMO2_SWITCH_SISO_B:
1559                 case IL_MIMO2_SWITCH_SISO_C:
1560                         D_RATE("LQ: MIMO2 switch to SISO\n");
1561
1562                         /* Set up new search table for SISO */
1563                         memcpy(search_tbl, tbl, sz);
1564
1565                         if (tbl->action == IL_MIMO2_SWITCH_SISO_A)
1566                                 search_tbl->ant_type = ANT_A;
1567                         else if (tbl->action == IL_MIMO2_SWITCH_SISO_B)
1568                                 search_tbl->ant_type = ANT_B;
1569                         else
1570                                 search_tbl->ant_type = ANT_C;
1571
1572                         if (!il4965_rs_is_valid_ant
1573                             (valid_tx_ant, search_tbl->ant_type))
1574                                 break;
1575
1576                         ret =
1577                             il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
1578                                                      search_tbl, idx);
1579                         if (!ret)
1580                                 goto out;
1581
1582                         break;
1583
1584                 case IL_MIMO2_SWITCH_GI:
1585                         if (!tbl->is_ht40 &&
1586                             !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
1587                                 break;
1588                         if (tbl->is_ht40 &&
1589                             !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
1590                                 break;
1591
1592                         D_RATE("LQ: MIMO2 toggle SGI/NGI\n");
1593
1594                         /* Set up new search table for MIMO2 */
1595                         memcpy(search_tbl, tbl, sz);
1596                         search_tbl->is_SGI = !tbl->is_SGI;
1597                         il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1598                         /*
1599                          * If active table already uses the fastest possible
1600                          * modulation (dual stream with short guard interval),
1601                          * and it's working well, there's no need to look
1602                          * for a better type of modulation!
1603                          */
1604                         if (tbl->is_SGI) {
1605                                 s32 tpt = lq_sta->last_tpt / 100;
1606                                 if (tpt >= search_tbl->expected_tpt[idx])
1607                                         break;
1608                         }
1609                         search_tbl->current_rate =
1610                             il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
1611                                                          is_green);
1612                         update_search_tbl_counter = 1;
1613                         goto out;
1614
1615                 }
1616                 tbl->action++;
1617                 if (tbl->action > IL_MIMO2_SWITCH_GI)
1618                         tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
1619
1620                 if (tbl->action == start_action)
1621                         break;
1622         }
1623         search_tbl->lq_type = LQ_NONE;
1624         return 0;
1625 out:
1626         lq_sta->search_better_tbl = 1;
1627         tbl->action++;
1628         if (tbl->action > IL_MIMO2_SWITCH_GI)
1629                 tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
1630         if (update_search_tbl_counter)
1631                 search_tbl->action = tbl->action;
1632
1633         return 0;
1634
1635 }
1636
1637 /*
1638  * Check whether we should continue using same modulation mode, or
1639  * begin search for a new mode, based on:
1640  * 1) # tx successes or failures while using this mode
1641  * 2) # times calling this function
1642  * 3) elapsed time in this mode (not used, for now)
1643  */
1644 static void
1645 il4965_rs_stay_in_table(struct il_lq_sta *lq_sta, bool force_search)
1646 {
1647         struct il_scale_tbl_info *tbl;
1648         int i;
1649         int active_tbl;
1650         int flush_interval_passed = 0;
1651         struct il_priv *il;
1652
1653         il = lq_sta->drv;
1654         active_tbl = lq_sta->active_tbl;
1655
1656         tbl = &(lq_sta->lq_info[active_tbl]);
1657
1658         /* If we've been disallowing search, see if we should now allow it */
1659         if (lq_sta->stay_in_tbl) {
1660
1661                 /* Elapsed time using current modulation mode */
1662                 if (lq_sta->flush_timer)
1663                         flush_interval_passed =
1664                             time_after(jiffies,
1665                                        (unsigned long)(lq_sta->flush_timer +
1666                                                        RATE_SCALE_FLUSH_INTVL));
1667
1668                 /*
1669                  * Check if we should allow search for new modulation mode.
1670                  * If many frames have failed or succeeded, or we've used
1671                  * this same modulation for a long time, allow search, and
1672                  * reset history stats that keep track of whether we should
1673                  * allow a new search.  Also (below) reset all bitmaps and
1674                  * stats in active history.
1675                  */
1676                 if (force_search ||
1677                     lq_sta->total_failed > lq_sta->max_failure_limit ||
1678                     lq_sta->total_success > lq_sta->max_success_limit ||
1679                     (!lq_sta->search_better_tbl && lq_sta->flush_timer &&
1680                      flush_interval_passed)) {
1681                         D_RATE("LQ: stay is expired %d %d %d\n",
1682                                lq_sta->total_failed, lq_sta->total_success,
1683                                flush_interval_passed);
1684
1685                         /* Allow search for new mode */
1686                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1687                         lq_sta->total_failed = 0;
1688                         lq_sta->total_success = 0;
1689                         lq_sta->flush_timer = 0;
1690
1691                         /*
1692                          * Else if we've used this modulation mode enough repetitions
1693                          * (regardless of elapsed time or success/failure), reset
1694                          * history bitmaps and rate-specific stats for all rates in
1695                          * active table.
1696                          */
1697                 } else {
1698                         lq_sta->table_count++;
1699                         if (lq_sta->table_count >= lq_sta->table_count_limit) {
1700                                 lq_sta->table_count = 0;
1701
1702                                 D_RATE("LQ: stay in table clear win\n");
1703                                 for (i = 0; i < RATE_COUNT; i++)
1704                                         il4965_rs_rate_scale_clear_win(&
1705                                                                        (tbl->
1706                                                                         win
1707                                                                         [i]));
1708                         }
1709                 }
1710
1711                 /* If transitioning to allow "search", reset all history
1712                  * bitmaps and stats in active table (this will become the new
1713                  * "search" table). */
1714                 if (!lq_sta->stay_in_tbl) {
1715                         for (i = 0; i < RATE_COUNT; i++)
1716                                 il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
1717                 }
1718         }
1719 }
1720
1721 /*
1722  * setup rate table in uCode
1723  */
1724 static void
1725 il4965_rs_update_rate_tbl(struct il_priv *il, struct il_lq_sta *lq_sta,
1726                           struct il_scale_tbl_info *tbl, int idx, u8 is_green)
1727 {
1728         u32 rate;
1729
1730         /* Update uCode's rate table. */
1731         rate = il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
1732         il4965_rs_fill_link_cmd(il, lq_sta, rate);
1733         il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
1734 }
1735
1736 /*
1737  * Do rate scaling and search for new modulation mode.
1738  */
1739 static void
1740 il4965_rs_rate_scale_perform(struct il_priv *il, struct sk_buff *skb,
1741                              struct ieee80211_sta *sta,
1742                              struct il_lq_sta *lq_sta)
1743 {
1744         struct ieee80211_hw *hw = il->hw;
1745         struct ieee80211_conf *conf = &hw->conf;
1746         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1747         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1748         int low = RATE_INVALID;
1749         int high = RATE_INVALID;
1750         int idx;
1751         int i;
1752         struct il_rate_scale_data *win = NULL;
1753         int current_tpt = IL_INVALID_VALUE;
1754         int low_tpt = IL_INVALID_VALUE;
1755         int high_tpt = IL_INVALID_VALUE;
1756         u32 fail_count;
1757         s8 scale_action = 0;
1758         u16 rate_mask;
1759         u8 update_lq = 0;
1760         struct il_scale_tbl_info *tbl, *tbl1;
1761         u16 rate_scale_idx_msk = 0;
1762         u8 is_green = 0;
1763         u8 active_tbl = 0;
1764         u8 done_search = 0;
1765         u16 high_low;
1766         s32 sr;
1767         u8 tid = MAX_TID_COUNT;
1768         struct il_tid_data *tid_data;
1769
1770         D_RATE("rate scale calculate new rate for skb\n");
1771
1772         /* Send management frames and NO_ACK data using lowest rate. */
1773         /* TODO: this could probably be improved.. */
1774         if (!ieee80211_is_data(hdr->frame_control) ||
1775             (info->flags & IEEE80211_TX_CTL_NO_ACK))
1776                 return;
1777
1778         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1779
1780         tid = il4965_rs_tl_add_packet(lq_sta, hdr);
1781         if (tid != MAX_TID_COUNT && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1782                 tid_data = &il->stations[lq_sta->lq.sta_id].tid[tid];
1783                 if (tid_data->agg.state == IL_AGG_OFF)
1784                         lq_sta->is_agg = 0;
1785                 else
1786                         lq_sta->is_agg = 1;
1787         } else
1788                 lq_sta->is_agg = 0;
1789
1790         /*
1791          * Select rate-scale / modulation-mode table to work with in
1792          * the rest of this function:  "search" if searching for better
1793          * modulation mode, or "active" if doing rate scaling within a mode.
1794          */
1795         if (!lq_sta->search_better_tbl)
1796                 active_tbl = lq_sta->active_tbl;
1797         else
1798                 active_tbl = 1 - lq_sta->active_tbl;
1799
1800         tbl = &(lq_sta->lq_info[active_tbl]);
1801         if (is_legacy(tbl->lq_type))
1802                 lq_sta->is_green = 0;
1803         else
1804                 lq_sta->is_green = il4965_rs_use_green(il, sta);
1805         is_green = lq_sta->is_green;
1806
1807         /* current tx rate */
1808         idx = lq_sta->last_txrate_idx;
1809
1810         D_RATE("Rate scale idx %d for type %d\n", idx, tbl->lq_type);
1811
1812         /* rates available for this association, and for modulation mode */
1813         rate_mask = il4965_rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1814
1815         D_RATE("mask 0x%04X\n", rate_mask);
1816
1817         /* mask with station rate restriction */
1818         if (is_legacy(tbl->lq_type)) {
1819                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1820                         /* supp_rates has no CCK bits in A mode */
1821                         rate_scale_idx_msk =
1822                             (u16) (rate_mask &
1823                                    (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
1824                 else
1825                         rate_scale_idx_msk =
1826                             (u16) (rate_mask & lq_sta->supp_rates);
1827
1828         } else
1829                 rate_scale_idx_msk = rate_mask;
1830
1831         if (!rate_scale_idx_msk)
1832                 rate_scale_idx_msk = rate_mask;
1833
1834         if (!((1 << idx) & rate_scale_idx_msk)) {
1835                 IL_ERR("Current Rate is not valid\n");
1836                 if (lq_sta->search_better_tbl) {
1837                         /* revert to active table if search table is not valid */
1838                         tbl->lq_type = LQ_NONE;
1839                         lq_sta->search_better_tbl = 0;
1840                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1841                         /* get "active" rate info */
1842                         idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
1843                         il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx,
1844                                                       is_green);
1845                 }
1846                 return;
1847         }
1848
1849         /* Get expected throughput table and history win for current rate */
1850         if (!tbl->expected_tpt) {
1851                 IL_ERR("tbl->expected_tpt is NULL\n");
1852                 return;
1853         }
1854
1855         /* force user max rate if set by user */
1856         if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < idx) {
1857                 idx = lq_sta->max_rate_idx;
1858                 update_lq = 1;
1859                 win = &(tbl->win[idx]);
1860                 goto lq_update;
1861         }
1862
1863         win = &(tbl->win[idx]);
1864
1865         /*
1866          * If there is not enough history to calculate actual average
1867          * throughput, keep analyzing results of more tx frames, without
1868          * changing rate or mode (bypass most of the rest of this function).
1869          * Set up new rate table in uCode only if old rate is not supported
1870          * in current association (use new rate found above).
1871          */
1872         fail_count = win->counter - win->success_counter;
1873         if (fail_count < RATE_MIN_FAILURE_TH &&
1874             win->success_counter < RATE_MIN_SUCCESS_TH) {
1875                 D_RATE("LQ: still below TH. succ=%d total=%d " "for idx %d\n",
1876                        win->success_counter, win->counter, idx);
1877
1878                 /* Can't calculate this yet; not enough history */
1879                 win->average_tpt = IL_INVALID_VALUE;
1880
1881                 /* Should we stay with this modulation mode,
1882                  * or search for a new one? */
1883                 il4965_rs_stay_in_table(lq_sta, false);
1884
1885                 goto out;
1886         }
1887         /* Else we have enough samples; calculate estimate of
1888          * actual average throughput */
1889         if (win->average_tpt !=
1890             ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128)) {
1891                 IL_ERR("expected_tpt should have been calculated by now\n");
1892                 win->average_tpt =
1893                     ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128);
1894         }
1895
1896         /* If we are searching for better modulation mode, check success. */
1897         if (lq_sta->search_better_tbl) {
1898                 /* If good success, continue using the "search" mode;
1899                  * no need to send new link quality command, since we're
1900                  * continuing to use the setup that we've been trying. */
1901                 if (win->average_tpt > lq_sta->last_tpt) {
1902
1903                         D_RATE("LQ: SWITCHING TO NEW TBL "
1904                                "suc=%d cur-tpt=%d old-tpt=%d\n",
1905                                win->success_ratio, win->average_tpt,
1906                                lq_sta->last_tpt);
1907
1908                         if (!is_legacy(tbl->lq_type))
1909                                 lq_sta->enable_counter = 1;
1910
1911                         /* Swap tables; "search" becomes "active" */
1912                         lq_sta->active_tbl = active_tbl;
1913                         current_tpt = win->average_tpt;
1914
1915                         /* Else poor success; go back to mode in "active" table */
1916                 } else {
1917
1918                         D_RATE("LQ: GOING BACK TO THE OLD TBL "
1919                                "suc=%d cur-tpt=%d old-tpt=%d\n",
1920                                win->success_ratio, win->average_tpt,
1921                                lq_sta->last_tpt);
1922
1923                         /* Nullify "search" table */
1924                         tbl->lq_type = LQ_NONE;
1925
1926                         /* Revert to "active" table */
1927                         active_tbl = lq_sta->active_tbl;
1928                         tbl = &(lq_sta->lq_info[active_tbl]);
1929
1930                         /* Revert to "active" rate and throughput info */
1931                         idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
1932                         current_tpt = lq_sta->last_tpt;
1933
1934                         /* Need to set up a new rate table in uCode */
1935                         update_lq = 1;
1936                 }
1937
1938                 /* Either way, we've made a decision; modulation mode
1939                  * search is done, allow rate adjustment next time. */
1940                 lq_sta->search_better_tbl = 0;
1941                 done_search = 1;        /* Don't switch modes below! */
1942                 goto lq_update;
1943         }
1944
1945         /* (Else) not in search of better modulation mode, try for better
1946          * starting rate, while staying in this mode. */
1947         high_low =
1948             il4965_rs_get_adjacent_rate(il, idx, rate_scale_idx_msk,
1949                                         tbl->lq_type);
1950         low = high_low & 0xff;
1951         high = (high_low >> 8) & 0xff;
1952
1953         /* If user set max rate, dont allow higher than user constrain */
1954         if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < high)
1955                 high = RATE_INVALID;
1956
1957         sr = win->success_ratio;
1958
1959         /* Collect measured throughputs for current and adjacent rates */
1960         current_tpt = win->average_tpt;
1961         if (low != RATE_INVALID)
1962                 low_tpt = tbl->win[low].average_tpt;
1963         if (high != RATE_INVALID)
1964                 high_tpt = tbl->win[high].average_tpt;
1965
1966         scale_action = 0;
1967
1968         /* Too many failures, decrease rate */
1969         if (sr <= RATE_DECREASE_TH || current_tpt == 0) {
1970                 D_RATE("decrease rate because of low success_ratio\n");
1971                 scale_action = -1;
1972
1973                 /* No throughput measured yet for adjacent rates; try increase. */
1974         } else if (low_tpt == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) {
1975
1976                 if (high != RATE_INVALID && sr >= RATE_INCREASE_TH)
1977                         scale_action = 1;
1978                 else if (low != RATE_INVALID)
1979                         scale_action = 0;
1980         }
1981
1982         /* Both adjacent throughputs are measured, but neither one has better
1983          * throughput; we're using the best rate, don't change it! */
1984         else if (low_tpt != IL_INVALID_VALUE && high_tpt != IL_INVALID_VALUE &&
1985                  low_tpt < current_tpt && high_tpt < current_tpt)
1986                 scale_action = 0;
1987
1988         /* At least one adjacent rate's throughput is measured,
1989          * and may have better performance. */
1990         else {
1991                 /* Higher adjacent rate's throughput is measured */
1992                 if (high_tpt != IL_INVALID_VALUE) {
1993                         /* Higher rate has better throughput */
1994                         if (high_tpt > current_tpt && sr >= RATE_INCREASE_TH)
1995                                 scale_action = 1;
1996                         else
1997                                 scale_action = 0;
1998
1999                         /* Lower adjacent rate's throughput is measured */
2000                 } else if (low_tpt != IL_INVALID_VALUE) {
2001                         /* Lower rate has better throughput */
2002                         if (low_tpt > current_tpt) {
2003                                 D_RATE("decrease rate because of low tpt\n");
2004                                 scale_action = -1;
2005                         } else if (sr >= RATE_INCREASE_TH) {
2006                                 scale_action = 1;
2007                         }
2008                 }
2009         }
2010
2011         /* Sanity check; asked for decrease, but success rate or throughput
2012          * has been good at old rate.  Don't change it. */
2013         if (scale_action == -1 && low != RATE_INVALID &&
2014             (sr > RATE_HIGH_TH || current_tpt > 100 * tbl->expected_tpt[low]))
2015                 scale_action = 0;
2016
2017         switch (scale_action) {
2018         case -1:
2019                 /* Decrease starting rate, update uCode's rate table */
2020                 if (low != RATE_INVALID) {
2021                         update_lq = 1;
2022                         idx = low;
2023                 }
2024
2025                 break;
2026         case 1:
2027                 /* Increase starting rate, update uCode's rate table */
2028                 if (high != RATE_INVALID) {
2029                         update_lq = 1;
2030                         idx = high;
2031                 }
2032
2033                 break;
2034         case 0:
2035                 /* No change */
2036         default:
2037                 break;
2038         }
2039
2040         D_RATE("choose rate scale idx %d action %d low %d " "high %d type %d\n",
2041                idx, scale_action, low, high, tbl->lq_type);
2042
2043 lq_update:
2044         /* Replace uCode's rate table for the destination station. */
2045         if (update_lq)
2046                 il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx, is_green);
2047
2048         /* Should we stay with this modulation mode,
2049          * or search for a new one? */
2050         il4965_rs_stay_in_table(lq_sta, false);
2051
2052         /*
2053          * Search for new modulation mode if we're:
2054          * 1)  Not changing rates right now
2055          * 2)  Not just finishing up a search
2056          * 3)  Allowing a new search
2057          */
2058         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && win->counter) {
2059                 /* Save current throughput to compare with "search" throughput */
2060                 lq_sta->last_tpt = current_tpt;
2061
2062                 /* Select a new "search" modulation mode to try.
2063                  * If one is found, set up the new "search" table. */
2064                 if (is_legacy(tbl->lq_type))
2065                         il4965_rs_move_legacy_other(il, lq_sta, conf, sta, idx);
2066                 else if (is_siso(tbl->lq_type))
2067                         il4965_rs_move_siso_to_other(il, lq_sta, conf, sta,
2068                                                      idx);
2069                 else            /* (is_mimo2(tbl->lq_type)) */
2070                         il4965_rs_move_mimo2_to_other(il, lq_sta, conf, sta,
2071                                                       idx);
2072
2073                 /* If new "search" mode was selected, set up in uCode table */
2074                 if (lq_sta->search_better_tbl) {
2075                         /* Access the "search" table, clear its history. */
2076                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2077                         for (i = 0; i < RATE_COUNT; i++)
2078                                 il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
2079
2080                         /* Use new "search" start rate */
2081                         idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
2082
2083                         D_RATE("Switch current  mcs: %X idx: %d\n",
2084                                tbl->current_rate, idx);
2085                         il4965_rs_fill_link_cmd(il, lq_sta, tbl->current_rate);
2086                         il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
2087                 } else
2088                         done_search = 1;
2089         }
2090
2091         if (done_search && !lq_sta->stay_in_tbl) {
2092                 /* If the "active" (non-search) mode was legacy,
2093                  * and we've tried switching antennas,
2094                  * but we haven't been able to try HT modes (not available),
2095                  * stay with best antenna legacy modulation for a while
2096                  * before next round of mode comparisons. */
2097                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2098                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2099                     lq_sta->action_counter > tbl1->max_search) {
2100                         D_RATE("LQ: STAY in legacy table\n");
2101                         il4965_rs_set_stay_in_table(il, 1, lq_sta);
2102                 }
2103
2104                 /* If we're in an HT mode, and all 3 mode switch actions
2105                  * have been tried and compared, stay in this best modulation
2106                  * mode for a while before next round of mode comparisons. */
2107                 if (lq_sta->enable_counter &&
2108                     lq_sta->action_counter >= tbl1->max_search) {
2109                         if (lq_sta->last_tpt > IL_AGG_TPT_THREHOLD &&
2110                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2111                             tid != MAX_TID_COUNT) {
2112                                 tid_data =
2113                                     &il->stations[lq_sta->lq.sta_id].tid[tid];
2114                                 if (tid_data->agg.state == IL_AGG_OFF) {
2115                                         D_RATE("try to aggregate tid %d\n",
2116                                                tid);
2117                                         il4965_rs_tl_turn_on_agg(il, tid,
2118                                                                  lq_sta, sta);
2119                                 }
2120                         }
2121                         il4965_rs_set_stay_in_table(il, 0, lq_sta);
2122                 }
2123         }
2124
2125 out:
2126         tbl->current_rate =
2127             il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
2128         i = idx;
2129         lq_sta->last_txrate_idx = i;
2130 }
2131
2132 /**
2133  * il4965_rs_initialize_lq - Initialize a station's hardware rate table
2134  *
2135  * The uCode's station table contains a table of fallback rates
2136  * for automatic fallback during transmission.
2137  *
2138  * NOTE: This sets up a default set of values.  These will be replaced later
2139  *       if the driver's iwl-4965-rs rate scaling algorithm is used, instead of
2140  *       rc80211_simple.
2141  *
2142  * NOTE: Run C_ADD_STA command to set up station table entry, before
2143  *       calling this function (which runs C_TX_LINK_QUALITY_CMD,
2144  *       which requires station table entry to exist).
2145  */
2146 static void
2147 il4965_rs_initialize_lq(struct il_priv *il, struct ieee80211_conf *conf,
2148                         struct ieee80211_sta *sta, struct il_lq_sta *lq_sta)
2149 {
2150         struct il_scale_tbl_info *tbl;
2151         int rate_idx;
2152         int i;
2153         u32 rate;
2154         u8 use_green;
2155         u8 active_tbl = 0;
2156         u8 valid_tx_ant;
2157         struct il_station_priv *sta_priv;
2158
2159         if (!sta || !lq_sta)
2160                 return;
2161
2162         use_green = il4965_rs_use_green(il, sta);
2163         sta_priv = (void *)sta->drv_priv;
2164
2165         i = lq_sta->last_txrate_idx;
2166
2167         valid_tx_ant = il->hw_params.valid_tx_ant;
2168
2169         if (!lq_sta->search_better_tbl)
2170                 active_tbl = lq_sta->active_tbl;
2171         else
2172                 active_tbl = 1 - lq_sta->active_tbl;
2173
2174         tbl = &(lq_sta->lq_info[active_tbl]);
2175
2176         if (i < 0 || i >= RATE_COUNT)
2177                 i = 0;
2178
2179         rate = il_rates[i].plcp;
2180         tbl->ant_type = il4965_first_antenna(valid_tx_ant);
2181         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2182
2183         if (i >= IL_FIRST_CCK_RATE && i <= IL_LAST_CCK_RATE)
2184                 rate |= RATE_MCS_CCK_MSK;
2185
2186         il4965_rs_get_tbl_info_from_mcs(rate, il->band, tbl, &rate_idx);
2187         if (!il4965_rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2188                 il4965_rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2189
2190         rate = il4965_rate_n_flags_from_tbl(il, tbl, rate_idx, use_green);
2191         tbl->current_rate = rate;
2192         il4965_rs_set_expected_tpt_table(lq_sta, tbl);
2193         il4965_rs_fill_link_cmd(NULL, lq_sta, rate);
2194         il->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2195         il_send_lq_cmd(il, &lq_sta->lq, CMD_SYNC, true);
2196 }
2197
2198 static void
2199 il4965_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta,
2200                    struct ieee80211_tx_rate_control *txrc)
2201 {
2202
2203         struct sk_buff *skb = txrc->skb;
2204         struct ieee80211_supported_band *sband = txrc->sband;
2205         struct il_priv *il __maybe_unused = (struct il_priv *)il_r;
2206         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2207         struct il_lq_sta *lq_sta = il_sta;
2208         int rate_idx;
2209
2210         D_RATE("rate scale calculate new rate for skb\n");
2211
2212         /* Get max rate if user set max rate */
2213         if (lq_sta) {
2214                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2215                 if (sband->band == IEEE80211_BAND_5GHZ &&
2216                     lq_sta->max_rate_idx != -1)
2217                         lq_sta->max_rate_idx += IL_FIRST_OFDM_RATE;
2218                 if (lq_sta->max_rate_idx < 0 ||
2219                     lq_sta->max_rate_idx >= RATE_COUNT)
2220                         lq_sta->max_rate_idx = -1;
2221         }
2222
2223         /* Treat uninitialized rate scaling data same as non-existing. */
2224         if (lq_sta && !lq_sta->drv) {
2225                 D_RATE("Rate scaling not initialized yet.\n");
2226                 il_sta = NULL;
2227         }
2228
2229         /* Send management frames and NO_ACK data using lowest rate. */
2230         if (rate_control_send_low(sta, il_sta, txrc))
2231                 return;
2232
2233         if (!lq_sta)
2234                 return;
2235
2236         rate_idx = lq_sta->last_txrate_idx;
2237
2238         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2239                 rate_idx -= IL_FIRST_OFDM_RATE;
2240                 /* 6M and 9M shared same MCS idx */
2241                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2242                 if (il4965_rs_extract_rate(lq_sta->last_rate_n_flags) >=
2243                     RATE_MIMO2_6M_PLCP)
2244                         rate_idx = rate_idx + MCS_IDX_PER_STREAM;
2245                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2246                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2247                         info->control.rates[0].flags |=
2248                             IEEE80211_TX_RC_SHORT_GI;
2249                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2250                         info->control.rates[0].flags |=
2251                             IEEE80211_TX_RC_DUP_DATA;
2252                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2253                         info->control.rates[0].flags |=
2254                             IEEE80211_TX_RC_40_MHZ_WIDTH;
2255                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2256                         info->control.rates[0].flags |=
2257                             IEEE80211_TX_RC_GREEN_FIELD;
2258         } else {
2259                 /* Check for invalid rates */
2260                 if (rate_idx < 0 || rate_idx >= RATE_COUNT_LEGACY ||
2261                     (sband->band == IEEE80211_BAND_5GHZ &&
2262                      rate_idx < IL_FIRST_OFDM_RATE))
2263                         rate_idx = rate_lowest_index(sband, sta);
2264                 /* On valid 5 GHz rate, adjust idx */
2265                 else if (sband->band == IEEE80211_BAND_5GHZ)
2266                         rate_idx -= IL_FIRST_OFDM_RATE;
2267                 info->control.rates[0].flags = 0;
2268         }
2269         info->control.rates[0].idx = rate_idx;
2270         info->control.rates[0].count = 1;
2271 }
2272
2273 static void *
2274 il4965_rs_alloc_sta(void *il_rate, struct ieee80211_sta *sta, gfp_t gfp)
2275 {
2276         struct il_station_priv *sta_priv =
2277             (struct il_station_priv *)sta->drv_priv;
2278         struct il_priv *il;
2279
2280         il = (struct il_priv *)il_rate;
2281         D_RATE("create station rate scale win\n");
2282
2283         return &sta_priv->lq_sta;
2284 }
2285
2286 /*
2287  * Called after adding a new station to initialize rate scaling
2288  */
2289 void
2290 il4965_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id)
2291 {
2292         int i, j;
2293         struct ieee80211_hw *hw = il->hw;
2294         struct ieee80211_conf *conf = &il->hw->conf;
2295         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2296         struct il_station_priv *sta_priv;
2297         struct il_lq_sta *lq_sta;
2298         struct ieee80211_supported_band *sband;
2299
2300         sta_priv = (struct il_station_priv *)sta->drv_priv;
2301         lq_sta = &sta_priv->lq_sta;
2302         sband = hw->wiphy->bands[conf->chandef.chan->band];
2303
2304         lq_sta->lq.sta_id = sta_id;
2305
2306         for (j = 0; j < LQ_SIZE; j++)
2307                 for (i = 0; i < RATE_COUNT; i++)
2308                         il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
2309                                                        win[i]);
2310
2311         lq_sta->flush_timer = 0;
2312         lq_sta->supp_rates = sta->supp_rates[sband->band];
2313         for (j = 0; j < LQ_SIZE; j++)
2314                 for (i = 0; i < RATE_COUNT; i++)
2315                         il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
2316                                                        win[i]);
2317
2318         D_RATE("LQ:" "*** rate scale station global init for station %d ***\n",
2319                sta_id);
2320         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2321          * the lowest or the highest rate.. Could consider using RSSI from
2322          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2323          * after assoc.. */
2324
2325         lq_sta->is_dup = 0;
2326         lq_sta->max_rate_idx = -1;
2327         lq_sta->missed_rate_counter = IL_MISSED_RATE_MAX;
2328         lq_sta->is_green = il4965_rs_use_green(il, sta);
2329         lq_sta->active_legacy_rate = il->active_rate & ~(0x1000);
2330         lq_sta->band = il->band;
2331         /*
2332          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2333          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2334          */
2335         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2336         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2337         lq_sta->active_siso_rate &= ~((u16) 0x2);
2338         lq_sta->active_siso_rate <<= IL_FIRST_OFDM_RATE;
2339
2340         /* Same here */
2341         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2342         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2343         lq_sta->active_mimo2_rate &= ~((u16) 0x2);
2344         lq_sta->active_mimo2_rate <<= IL_FIRST_OFDM_RATE;
2345
2346         /* These values will be overridden later */
2347         lq_sta->lq.general_params.single_stream_ant_msk =
2348             il4965_first_antenna(il->hw_params.valid_tx_ant);
2349         lq_sta->lq.general_params.dual_stream_ant_msk =
2350             il->hw_params.valid_tx_ant & ~il4965_first_antenna(il->hw_params.
2351                                                                valid_tx_ant);
2352         if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2353                 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2354         } else if (il4965_num_of_ant(il->hw_params.valid_tx_ant) == 2) {
2355                 lq_sta->lq.general_params.dual_stream_ant_msk =
2356                     il->hw_params.valid_tx_ant;
2357         }
2358
2359         /* as default allow aggregation for all tids */
2360         lq_sta->tx_agg_tid_en = IL_AGG_ALL_TID;
2361         lq_sta->drv = il;
2362
2363         /* Set last_txrate_idx to lowest rate */
2364         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2365         if (sband->band == IEEE80211_BAND_5GHZ)
2366                 lq_sta->last_txrate_idx += IL_FIRST_OFDM_RATE;
2367         lq_sta->is_agg = 0;
2368
2369 #ifdef CONFIG_MAC80211_DEBUGFS
2370         lq_sta->dbg_fixed_rate = 0;
2371 #endif
2372
2373         il4965_rs_initialize_lq(il, conf, sta, lq_sta);
2374 }
2375
2376 static void
2377 il4965_rs_fill_link_cmd(struct il_priv *il, struct il_lq_sta *lq_sta,
2378                         u32 new_rate)
2379 {
2380         struct il_scale_tbl_info tbl_type;
2381         int idx = 0;
2382         int rate_idx;
2383         int repeat_rate = 0;
2384         u8 ant_toggle_cnt = 0;
2385         u8 use_ht_possible = 1;
2386         u8 valid_tx_ant = 0;
2387         struct il_link_quality_cmd *lq_cmd = &lq_sta->lq;
2388
2389         /* Override starting rate (idx 0) if needed for debug purposes */
2390         il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2391
2392         /* Interpret new_rate (rate_n_flags) */
2393         il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2394                                         &rate_idx);
2395
2396         /* How many times should we repeat the initial rate? */
2397         if (is_legacy(tbl_type.lq_type)) {
2398                 ant_toggle_cnt = 1;
2399                 repeat_rate = IL_NUMBER_TRY;
2400         } else {
2401                 repeat_rate = IL_HT_NUMBER_TRY;
2402         }
2403
2404         lq_cmd->general_params.mimo_delimiter =
2405             is_mimo(tbl_type.lq_type) ? 1 : 0;
2406
2407         /* Fill 1st table entry (idx 0) */
2408         lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
2409
2410         if (il4965_num_of_ant(tbl_type.ant_type) == 1) {
2411                 lq_cmd->general_params.single_stream_ant_msk =
2412                     tbl_type.ant_type;
2413         } else if (il4965_num_of_ant(tbl_type.ant_type) == 2) {
2414                 lq_cmd->general_params.dual_stream_ant_msk = tbl_type.ant_type;
2415         }
2416         /* otherwise we don't modify the existing value */
2417         idx++;
2418         repeat_rate--;
2419         if (il)
2420                 valid_tx_ant = il->hw_params.valid_tx_ant;
2421
2422         /* Fill rest of rate table */
2423         while (idx < LINK_QUAL_MAX_RETRY_NUM) {
2424                 /* Repeat initial/next rate.
2425                  * For legacy IL_NUMBER_TRY == 1, this loop will not execute.
2426                  * For HT IL_HT_NUMBER_TRY == 3, this executes twice. */
2427                 while (repeat_rate > 0 && idx < LINK_QUAL_MAX_RETRY_NUM) {
2428                         if (is_legacy(tbl_type.lq_type)) {
2429                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2430                                         ant_toggle_cnt++;
2431                                 else if (il &&
2432                                          il4965_rs_toggle_antenna(valid_tx_ant,
2433                                                                   &new_rate,
2434                                                                   &tbl_type))
2435                                         ant_toggle_cnt = 1;
2436                         }
2437
2438                         /* Override next rate if needed for debug purposes */
2439                         il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2440
2441                         /* Fill next table entry */
2442                         lq_cmd->rs_table[idx].rate_n_flags =
2443                             cpu_to_le32(new_rate);
2444                         repeat_rate--;
2445                         idx++;
2446                 }
2447
2448                 il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2449                                                 &tbl_type, &rate_idx);
2450
2451                 /* Indicate to uCode which entries might be MIMO.
2452                  * If initial rate was MIMO, this will finally end up
2453                  * as (IL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2454                 if (is_mimo(tbl_type.lq_type))
2455                         lq_cmd->general_params.mimo_delimiter = idx;
2456
2457                 /* Get next rate */
2458                 new_rate =
2459                     il4965_rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2460                                              use_ht_possible);
2461
2462                 /* How many times should we repeat the next rate? */
2463                 if (is_legacy(tbl_type.lq_type)) {
2464                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2465                                 ant_toggle_cnt++;
2466                         else if (il &&
2467                                  il4965_rs_toggle_antenna(valid_tx_ant,
2468                                                           &new_rate, &tbl_type))
2469                                 ant_toggle_cnt = 1;
2470
2471                         repeat_rate = IL_NUMBER_TRY;
2472                 } else {
2473                         repeat_rate = IL_HT_NUMBER_TRY;
2474                 }
2475
2476                 /* Don't allow HT rates after next pass.
2477                  * il4965_rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2478                 use_ht_possible = 0;
2479
2480                 /* Override next rate if needed for debug purposes */
2481                 il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2482
2483                 /* Fill next table entry */
2484                 lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
2485
2486                 idx++;
2487                 repeat_rate--;
2488         }
2489
2490         lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2491         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2492
2493         lq_cmd->agg_params.agg_time_limit =
2494             cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2495 }
2496
2497 static void *
2498 il4965_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2499 {
2500         return hw->priv;
2501 }
2502
2503 /* rate scale requires free function to be implemented */
2504 static void
2505 il4965_rs_free(void *il_rate)
2506 {
2507         return;
2508 }
2509
2510 static void
2511 il4965_rs_free_sta(void *il_r, struct ieee80211_sta *sta, void *il_sta)
2512 {
2513         struct il_priv *il __maybe_unused = il_r;
2514
2515         D_RATE("enter\n");
2516         D_RATE("leave\n");
2517 }
2518
2519 #ifdef CONFIG_MAC80211_DEBUGFS
2520
2521 static void
2522 il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
2523 {
2524         struct il_priv *il;
2525         u8 valid_tx_ant;
2526         u8 ant_sel_tx;
2527
2528         il = lq_sta->drv;
2529         valid_tx_ant = il->hw_params.valid_tx_ant;
2530         if (lq_sta->dbg_fixed_rate) {
2531                 ant_sel_tx =
2532                     ((lq_sta->
2533                       dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) >>
2534                      RATE_MCS_ANT_POS);
2535                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2536                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2537                         D_RATE("Fixed rate ON\n");
2538                 } else {
2539                         lq_sta->dbg_fixed_rate = 0;
2540                         IL_ERR
2541                             ("Invalid antenna selection 0x%X, Valid is 0x%X\n",
2542                              ant_sel_tx, valid_tx_ant);
2543                         D_RATE("Fixed rate OFF\n");
2544                 }
2545         } else {
2546                 D_RATE("Fixed rate OFF\n");
2547         }
2548 }
2549
2550 static ssize_t
2551 il4965_rs_sta_dbgfs_scale_table_write(struct file *file,
2552                                       const char __user *user_buf,
2553                                       size_t count, loff_t *ppos)
2554 {
2555         struct il_lq_sta *lq_sta = file->private_data;
2556         struct il_priv *il;
2557         char buf[64];
2558         size_t buf_size;
2559         u32 parsed_rate;
2560
2561         il = lq_sta->drv;
2562         memset(buf, 0, sizeof(buf));
2563         buf_size = min(count, sizeof(buf) - 1);
2564         if (copy_from_user(buf, user_buf, buf_size))
2565                 return -EFAULT;
2566
2567         if (sscanf(buf, "%x", &parsed_rate) == 1)
2568                 lq_sta->dbg_fixed_rate = parsed_rate;
2569         else
2570                 lq_sta->dbg_fixed_rate = 0;
2571
2572         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2573         lq_sta->active_siso_rate = 0x1FD0;      /* 6 - 60 MBits, no 9, no CCK */
2574         lq_sta->active_mimo2_rate = 0x1FD0;     /* 6 - 60 MBits, no 9, no CCK */
2575
2576         D_RATE("sta_id %d rate 0x%X\n", lq_sta->lq.sta_id,
2577                lq_sta->dbg_fixed_rate);
2578
2579         if (lq_sta->dbg_fixed_rate) {
2580                 il4965_rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2581                 il_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
2582         }
2583
2584         return count;
2585 }
2586
2587 static ssize_t
2588 il4965_rs_sta_dbgfs_scale_table_read(struct file *file, char __user *user_buf,
2589                                      size_t count, loff_t *ppos)
2590 {
2591         char *buff;
2592         int desc = 0;
2593         int i = 0;
2594         int idx = 0;
2595         ssize_t ret;
2596
2597         struct il_lq_sta *lq_sta = file->private_data;
2598         struct il_priv *il;
2599         struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2600
2601         il = lq_sta->drv;
2602         buff = kmalloc(1024, GFP_KERNEL);
2603         if (!buff)
2604                 return -ENOMEM;
2605
2606         desc += sprintf(buff + desc, "sta_id %d\n", lq_sta->lq.sta_id);
2607         desc +=
2608             sprintf(buff + desc, "failed=%d success=%d rate=0%X\n",
2609                     lq_sta->total_failed, lq_sta->total_success,
2610                     lq_sta->active_legacy_rate);
2611         desc +=
2612             sprintf(buff + desc, "fixed rate 0x%X\n", lq_sta->dbg_fixed_rate);
2613         desc +=
2614             sprintf(buff + desc, "valid_tx_ant %s%s%s\n",
2615                     (il->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2616                     (il->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2617                     (il->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2618         desc +=
2619             sprintf(buff + desc, "lq type %s\n",
2620                     (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2621         if (is_Ht(tbl->lq_type)) {
2622                 desc +=
2623                     sprintf(buff + desc, " %s",
2624                             (is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");
2625                 desc +=
2626                     sprintf(buff + desc, " %s",
2627                             (tbl->is_ht40) ? "40MHz" : "20MHz");
2628                 desc +=
2629                     sprintf(buff + desc, " %s %s %s\n",
2630                             (tbl->is_SGI) ? "SGI" : "",
2631                             (lq_sta->is_green) ? "GF enabled" : "",
2632                             (lq_sta->is_agg) ? "AGG on" : "");
2633         }
2634         desc +=
2635             sprintf(buff + desc, "last tx rate=0x%X\n",
2636                     lq_sta->last_rate_n_flags);
2637         desc +=
2638             sprintf(buff + desc,
2639                     "general:" "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2640                     lq_sta->lq.general_params.flags,
2641                     lq_sta->lq.general_params.mimo_delimiter,
2642                     lq_sta->lq.general_params.single_stream_ant_msk,
2643                     lq_sta->lq.general_params.dual_stream_ant_msk);
2644
2645         desc +=
2646             sprintf(buff + desc,
2647                     "agg:"
2648                     "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2649                     le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2650                     lq_sta->lq.agg_params.agg_dis_start_th,
2651                     lq_sta->lq.agg_params.agg_frame_cnt_limit);
2652
2653         desc +=
2654             sprintf(buff + desc,
2655                     "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2656                     lq_sta->lq.general_params.start_rate_idx[0],
2657                     lq_sta->lq.general_params.start_rate_idx[1],
2658                     lq_sta->lq.general_params.start_rate_idx[2],
2659                     lq_sta->lq.general_params.start_rate_idx[3]);
2660
2661         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2662                 idx =
2663                     il4965_hwrate_to_plcp_idx(le32_to_cpu
2664                                               (lq_sta->lq.rs_table[i].
2665                                                rate_n_flags));
2666                 if (is_legacy(tbl->lq_type)) {
2667                         desc +=
2668                             sprintf(buff + desc, " rate[%d] 0x%X %smbps\n", i,
2669                                     le32_to_cpu(lq_sta->lq.rs_table[i].
2670                                                 rate_n_flags),
2671                                     il_rate_mcs[idx].mbps);
2672                 } else {
2673                         desc +=
2674                             sprintf(buff + desc, " rate[%d] 0x%X %smbps (%s)\n",
2675                                     i,
2676                                     le32_to_cpu(lq_sta->lq.rs_table[i].
2677                                                 rate_n_flags),
2678                                     il_rate_mcs[idx].mbps,
2679                                     il_rate_mcs[idx].mcs);
2680                 }
2681         }
2682
2683         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2684         kfree(buff);
2685         return ret;
2686 }
2687
2688 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2689         .write = il4965_rs_sta_dbgfs_scale_table_write,
2690         .read = il4965_rs_sta_dbgfs_scale_table_read,
2691         .open = simple_open,
2692         .llseek = default_llseek,
2693 };
2694
2695 static ssize_t
2696 il4965_rs_sta_dbgfs_stats_table_read(struct file *file, char __user *user_buf,
2697                                      size_t count, loff_t *ppos)
2698 {
2699         char *buff;
2700         int desc = 0;
2701         int i, j;
2702         ssize_t ret;
2703
2704         struct il_lq_sta *lq_sta = file->private_data;
2705
2706         buff = kmalloc(1024, GFP_KERNEL);
2707         if (!buff)
2708                 return -ENOMEM;
2709
2710         for (i = 0; i < LQ_SIZE; i++) {
2711                 desc +=
2712                     sprintf(buff + desc,
2713                             "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2714                             "rate=0x%X\n", lq_sta->active_tbl == i ? "*" : "x",
2715                             lq_sta->lq_info[i].lq_type,
2716                             lq_sta->lq_info[i].is_SGI,
2717                             lq_sta->lq_info[i].is_ht40,
2718                             lq_sta->lq_info[i].is_dup, lq_sta->is_green,
2719                             lq_sta->lq_info[i].current_rate);
2720                 for (j = 0; j < RATE_COUNT; j++) {
2721                         desc +=
2722                             sprintf(buff + desc,
2723                                     "counter=%d success=%d %%=%d\n",
2724                                     lq_sta->lq_info[i].win[j].counter,
2725                                     lq_sta->lq_info[i].win[j].success_counter,
2726                                     lq_sta->lq_info[i].win[j].success_ratio);
2727                 }
2728         }
2729         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2730         kfree(buff);
2731         return ret;
2732 }
2733
2734 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2735         .read = il4965_rs_sta_dbgfs_stats_table_read,
2736         .open = simple_open,
2737         .llseek = default_llseek,
2738 };
2739
2740 static ssize_t
2741 il4965_rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2742                                          char __user *user_buf, size_t count,
2743                                          loff_t *ppos)
2744 {
2745         char buff[120];
2746         int desc = 0;
2747         struct il_lq_sta *lq_sta = file->private_data;
2748         struct il_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2749
2750         if (is_Ht(tbl->lq_type))
2751                 desc +=
2752                     sprintf(buff + desc, "Bit Rate= %d Mb/s\n",
2753                             tbl->expected_tpt[lq_sta->last_txrate_idx]);
2754         else
2755                 desc +=
2756                     sprintf(buff + desc, "Bit Rate= %d Mb/s\n",
2757                             il_rates[lq_sta->last_txrate_idx].ieee >> 1);
2758
2759         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2760 }
2761
2762 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2763         .read = il4965_rs_sta_dbgfs_rate_scale_data_read,
2764         .open = simple_open,
2765         .llseek = default_llseek,
2766 };
2767
2768 static void
2769 il4965_rs_add_debugfs(void *il, void *il_sta, struct dentry *dir)
2770 {
2771         struct il_lq_sta *lq_sta = il_sta;
2772         lq_sta->rs_sta_dbgfs_scale_table_file =
2773             debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2774                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2775         lq_sta->rs_sta_dbgfs_stats_table_file =
2776             debugfs_create_file("rate_stats_table", S_IRUSR, dir, lq_sta,
2777                                 &rs_sta_dbgfs_stats_table_ops);
2778         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
2779             debugfs_create_file("rate_scale_data", S_IRUSR, dir, lq_sta,
2780                                 &rs_sta_dbgfs_rate_scale_data_ops);
2781         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2782             debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2783                               &lq_sta->tx_agg_tid_en);
2784
2785 }
2786
2787 static void
2788 il4965_rs_remove_debugfs(void *il, void *il_sta)
2789 {
2790         struct il_lq_sta *lq_sta = il_sta;
2791         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2792         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2793         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
2794         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2795 }
2796 #endif
2797
2798 /*
2799  * Initialization of rate scaling information is done by driver after
2800  * the station is added. Since mac80211 calls this function before a
2801  * station is added we ignore it.
2802  */
2803 static void
2804 il4965_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband,
2805                          struct cfg80211_chan_def *chandef,
2806                          struct ieee80211_sta *sta, void *il_sta)
2807 {
2808 }
2809
2810 static const struct rate_control_ops rs_4965_ops = {
2811         .name = IL4965_RS_NAME,
2812         .tx_status = il4965_rs_tx_status,
2813         .get_rate = il4965_rs_get_rate,
2814         .rate_init = il4965_rs_rate_init_stub,
2815         .alloc = il4965_rs_alloc,
2816         .free = il4965_rs_free,
2817         .alloc_sta = il4965_rs_alloc_sta,
2818         .free_sta = il4965_rs_free_sta,
2819 #ifdef CONFIG_MAC80211_DEBUGFS
2820         .add_sta_debugfs = il4965_rs_add_debugfs,
2821         .remove_sta_debugfs = il4965_rs_remove_debugfs,
2822 #endif
2823 };
2824
2825 int
2826 il4965_rate_control_register(void)
2827 {
2828         return ieee80211_rate_control_register(&rs_4965_ops);
2829 }
2830
2831 void
2832 il4965_rate_control_unregister(void)
2833 {
2834         ieee80211_rate_control_unregister(&rs_4965_ops);
2835 }