git.itanic.dy.fi Git - linux-stable/blob - drivers/net/wireless/intel/iwlegacy/4965-rs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /******************************************************************************
   3  *
   4  * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
   5  *
   6  * Contact Information:
   7  *  Intel Linux Wireless <ilw@linux.intel.com>
   8  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
   9  *
  10  *****************************************************************************/
  11 #include <linux/kernel.h>
  12 #include <linux/skbuff.h>
  13 #include <linux/slab.h>
  14 #include <net/mac80211.h>
  15
  16 #include <linux/netdevice.h>
  17 #include <linux/etherdevice.h>
  18 #include <linux/delay.h>
  19
  20 #include <linux/workqueue.h>
  21
  22 #include "common.h"
  23 #include "4965.h"
  24
  25 #define IL4965_RS_NAME "iwl-4965-rs"
  26
  27 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  28 #define IL_NUMBER_TRY      1
  29 #define IL_HT_NUMBER_TRY   3
  30
  31 #define RATE_MAX_WINDOW         62      /* # tx in history win */
  32 #define RATE_MIN_FAILURE_TH             6       /* min failures to calc tpt */
  33 #define RATE_MIN_SUCCESS_TH             8       /* min successes to calc tpt */
  34
  35 /* max allowed rate miss before sync LQ cmd */
  36 #define IL_MISSED_RATE_MAX              15
  37 /* max time to accum history 2 seconds */
  38 #define RATE_SCALE_FLUSH_INTVL   (3*HZ)
  39
  40 static u8 rs_ht_to_legacy[] = {
  41         RATE_6M_IDX, RATE_6M_IDX,
  42         RATE_6M_IDX, RATE_6M_IDX,
  43         RATE_6M_IDX,
  44         RATE_6M_IDX, RATE_9M_IDX,
  45         RATE_12M_IDX, RATE_18M_IDX,
  46         RATE_24M_IDX, RATE_36M_IDX,
  47         RATE_48M_IDX, RATE_54M_IDX
  48 };
  49
  50 static const u8 ant_toggle_lookup[] = {
  51         /*ANT_NONE -> */ ANT_NONE,
  52         /*ANT_A    -> */ ANT_B,
  53         /*ANT_B    -> */ ANT_C,
  54         /*ANT_AB   -> */ ANT_BC,
  55         /*ANT_C    -> */ ANT_A,
  56         /*ANT_AC   -> */ ANT_AB,
  57         /*ANT_BC   -> */ ANT_AC,
  58         /*ANT_ABC  -> */ ANT_ABC,
  59 };
  60
  61 #define IL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
  62         [RATE_##r##M_IDX] = { RATE_##r##M_PLCP,      \
  63                                     RATE_SISO_##s##M_PLCP, \
  64                                     RATE_MIMO2_##s##M_PLCP,\
  65                                     RATE_##r##M_IEEE,      \
  66                                     RATE_##ip##M_IDX,    \
  67                                     RATE_##in##M_IDX,    \
  68                                     RATE_##rp##M_IDX,    \
  69                                     RATE_##rn##M_IDX,    \
  70                                     RATE_##pp##M_IDX,    \
  71                                     RATE_##np##M_IDX }
  72
  73 /*
  74  * Parameter order:
  75  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
  76  *
  77  * If there isn't a valid next or previous rate then INV is used which
  78  * maps to RATE_INVALID
  79  *
  80  */
  81 const struct il_rate_info il_rates[RATE_COUNT] = {
  82         IL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),   /*  1mbps */
  83         IL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),         /*  2mbps */
  84         IL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),       /*5.5mbps */
  85         IL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),     /* 11mbps */
  86         IL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),         /*  6mbps */
  87         IL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),        /*  9mbps */
  88         IL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
  89         IL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
  90         IL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
  91         IL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
  92         IL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
  93         IL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
  94         IL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
  95 };
  96
  97 static int
  98 il4965_hwrate_to_plcp_idx(u32 rate_n_flags)
  99 {
 100         int idx = 0;
 101
 102         /* HT rate format */
 103         if (rate_n_flags & RATE_MCS_HT_MSK) {
 104                 idx = (rate_n_flags & 0xff);
 105
 106                 if (idx >= RATE_MIMO2_6M_PLCP)
 107                         idx = idx - RATE_MIMO2_6M_PLCP;
 108
 109                 idx += IL_FIRST_OFDM_RATE;
 110                 /* skip 9M not supported in ht */
 111                 if (idx >= RATE_9M_IDX)
 112                         idx += 1;
 113                 if (idx >= IL_FIRST_OFDM_RATE && idx <= IL_LAST_OFDM_RATE)
 114                         return idx;
 115
 116                 /* legacy rate format, search for match in table */
 117         } else {
 118                 for (idx = 0; idx < ARRAY_SIZE(il_rates); idx++)
 119                         if (il_rates[idx].plcp == (rate_n_flags & 0xFF))
 120                                 return idx;
 121         }
 122
 123         return -1;
 124 }
 125
 126 static void il4965_rs_rate_scale_perform(struct il_priv *il,
 127                                          struct sk_buff *skb,
 128                                          struct ieee80211_sta *sta,
 129                                          struct il_lq_sta *lq_sta);
 130 static void il4965_rs_fill_link_cmd(struct il_priv *il,
 131                                     struct il_lq_sta *lq_sta, u32 rate_n_flags);
 132 static void il4965_rs_stay_in_table(struct il_lq_sta *lq_sta,
 133                                     bool force_search);
 134
 135 #ifdef CONFIG_MAC80211_DEBUGFS
 136 static void il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta,
 137                                     u32 *rate_n_flags, int idx);
 138 #else
 139 static void
 140 il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
 141 {
 142 }
 143 #endif
 144
 145 /*
 146  * The following tables contain the expected throughput metrics for all rates
 147  *
 148  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 149  *
 150  * where invalid entries are zeros.
 151  *
 152  * CCK rates are only valid in legacy table and will only be used in G
 153  * (2.4 GHz) band.
 154  */
 155
 156 static s32 expected_tpt_legacy[RATE_COUNT] = {
 157         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 158 };
 159
 160 static s32 expected_tpt_siso20MHz[4][RATE_COUNT] = {
 161         {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202},  /* Norm */
 162         {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210},  /* SGI */
 163         {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381},  /* AGG */
 164         {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
 165 };
 166
 167 static s32 expected_tpt_siso40MHz[4][RATE_COUNT] = {
 168         {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 169         {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 170         {0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
 171         {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683},        /* AGG+SGI */
 172 };
 173
 174 static s32 expected_tpt_mimo2_20MHz[4][RATE_COUNT] = {
 175         {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
 176         {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
 177         {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
 178         {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660},        /* AGG+SGI */
 179 };
 180
 181 static s32 expected_tpt_mimo2_40MHz[4][RATE_COUNT] = {
 182         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289},        /* Norm */
 183         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293},        /* SGI */
 184         {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922},        /* AGG */
 185         {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966},        /* AGG+SGI */
 186 };
 187
 188 /* mbps, mcs */
 189 static const struct il_rate_mcs_info il_rate_mcs[RATE_COUNT] = {
 190         {"1", "BPSK DSSS"},
 191         {"2", "QPSK DSSS"},
 192         {"5.5", "BPSK CCK"},
 193         {"11", "QPSK CCK"},
 194         {"6", "BPSK 1/2"},
 195         {"9", "BPSK 1/2"},
 196         {"12", "QPSK 1/2"},
 197         {"18", "QPSK 3/4"},
 198         {"24", "16QAM 1/2"},
 199         {"36", "16QAM 3/4"},
 200         {"48", "64QAM 2/3"},
 201         {"54", "64QAM 3/4"},
 202         {"60", "64QAM 5/6"},
 203 };
 204
 205 #define MCS_IDX_PER_STREAM      (8)
 206
 207 static inline u8
 208 il4965_rs_extract_rate(u32 rate_n_flags)
 209 {
 210         return (u8) (rate_n_flags & 0xFF);
 211 }
 212
 213 static void
 214 il4965_rs_rate_scale_clear_win(struct il_rate_scale_data *win)
 215 {
 216         win->data = 0;
 217         win->success_counter = 0;
 218         win->success_ratio = IL_INVALID_VALUE;
 219         win->counter = 0;
 220         win->average_tpt = IL_INVALID_VALUE;
 221         win->stamp = 0;
 222 }
 223
 224 static inline u8
 225 il4965_rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 226 {
 227         return (ant_type & valid_antenna) == ant_type;
 228 }
 229
 230 /*
 231  *      removes the old data from the stats. All data that is older than
 232  *      TID_MAX_TIME_DIFF, will be deleted.
 233  */
 234 static void
 235 il4965_rs_tl_rm_old_stats(struct il_traffic_load *tl, u32 curr_time)
 236 {
 237         /* The oldest age we want to keep */
 238         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 239
 240         while (tl->queue_count && tl->time_stamp < oldest_time) {
 241                 tl->total -= tl->packet_count[tl->head];
 242                 tl->packet_count[tl->head] = 0;
 243                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 244                 tl->queue_count--;
 245                 tl->head++;
 246                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 247                         tl->head = 0;
 248         }
 249 }
 250
 251 /*
 252  *      increment traffic load value for tid and also remove
 253  *      any old values if passed the certain time period
 254  */
 255 static u8
 256 il4965_rs_tl_add_packet(struct il_lq_sta *lq_data, struct ieee80211_hdr *hdr)
 257 {
 258         u32 curr_time = jiffies_to_msecs(jiffies);
 259         u32 time_diff;
 260         s32 idx;
 261         struct il_traffic_load *tl = NULL;
 262         u8 tid;
 263
 264         if (ieee80211_is_data_qos(hdr->frame_control)) {
 265                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 266                 tid = qc[0] & 0xf;
 267         } else
 268                 return MAX_TID_COUNT;
 269
 270         if (unlikely(tid >= TID_MAX_LOAD_COUNT))
 271                 return MAX_TID_COUNT;
 272
 273         tl = &lq_data->load[tid];
 274
 275         curr_time -= curr_time % TID_ROUND_VALUE;
 276
 277         /* Happens only for the first packet. Initialize the data */
 278         if (!(tl->queue_count)) {
 279                 tl->total = 1;
 280                 tl->time_stamp = curr_time;
 281                 tl->queue_count = 1;
 282                 tl->head = 0;
 283                 tl->packet_count[0] = 1;
 284                 return MAX_TID_COUNT;
 285         }
 286
 287         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 288         idx = time_diff / TID_QUEUE_CELL_SPACING;
 289
 290         /* The history is too long: remove data that is older than */
 291         /* TID_MAX_TIME_DIFF */
 292         if (idx >= TID_QUEUE_MAX_SIZE)
 293                 il4965_rs_tl_rm_old_stats(tl, curr_time);
 294
 295         idx = (tl->head + idx) % TID_QUEUE_MAX_SIZE;
 296         tl->packet_count[idx] = tl->packet_count[idx] + 1;
 297         tl->total = tl->total + 1;
 298
 299         if ((idx + 1) > tl->queue_count)
 300                 tl->queue_count = idx + 1;
 301
 302         return tid;
 303 }
 304
 305 /*
 306         get the traffic load value for tid
 307 */
 308 static u32
 309 il4965_rs_tl_get_load(struct il_lq_sta *lq_data, u8 tid)
 310 {
 311         u32 curr_time = jiffies_to_msecs(jiffies);
 312         u32 time_diff;
 313         s32 idx;
 314         struct il_traffic_load *tl = NULL;
 315
 316         if (tid >= TID_MAX_LOAD_COUNT)
 317                 return 0;
 318
 319         tl = &(lq_data->load[tid]);
 320
 321         curr_time -= curr_time % TID_ROUND_VALUE;
 322
 323         if (!(tl->queue_count))
 324                 return 0;
 325
 326         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 327         idx = time_diff / TID_QUEUE_CELL_SPACING;
 328
 329         /* The history is too long: remove data that is older than */
 330         /* TID_MAX_TIME_DIFF */
 331         if (idx >= TID_QUEUE_MAX_SIZE)
 332                 il4965_rs_tl_rm_old_stats(tl, curr_time);
 333
 334         return tl->total;
 335 }
 336
 337 static int
 338 il4965_rs_tl_turn_on_agg_for_tid(struct il_priv *il, struct il_lq_sta *lq_data,
 339                                  u8 tid, struct ieee80211_sta *sta)
 340 {
 341         int ret = -EAGAIN;
 342         u32 load;
 343
 344         load = il4965_rs_tl_get_load(lq_data, tid);
 345
 346         if (load > IL_AGG_LOAD_THRESHOLD) {
 347                 D_HT("Starting Tx agg: STA: %pM tid: %d\n", sta->addr, tid);
 348                 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 349                 if (ret == -EAGAIN) {
 350                         /*
 351                          * driver and mac80211 is out of sync
 352                          * this might be cause by reloading firmware
 353                          * stop the tx ba session here
 354                          */
 355                         IL_ERR("Fail start Tx agg on tid: %d\n", tid);
 356                         ieee80211_stop_tx_ba_session(sta, tid);
 357                 }
 358         } else
 359                 D_HT("Aggregation not enabled for tid %d because load = %u\n",
 360                      tid, load);
 361
 362         return ret;
 363 }
 364
 365 static void
 366 il4965_rs_tl_turn_on_agg(struct il_priv *il, u8 tid, struct il_lq_sta *lq_data,
 367                          struct ieee80211_sta *sta)
 368 {
 369         if (tid < TID_MAX_LOAD_COUNT)
 370                 il4965_rs_tl_turn_on_agg_for_tid(il, lq_data, tid, sta);
 371         else
 372                 IL_ERR("tid exceeds max load count: %d/%d\n", tid,
 373                        TID_MAX_LOAD_COUNT);
 374 }
 375
 376 static inline int
 377 il4965_get_il4965_num_of_ant_from_rate(u32 rate_n_flags)
 378 {
 379         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 380             !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 381             !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 382 }
 383
 384 /*
 385  * Static function to get the expected throughput from an il_scale_tbl_info
 386  * that wraps a NULL pointer check
 387  */
 388 static s32
 389 il4965_get_expected_tpt(struct il_scale_tbl_info *tbl, int rs_idx)
 390 {
 391         if (tbl->expected_tpt)
 392                 return tbl->expected_tpt[rs_idx];
 393         return 0;
 394 }
 395
 396 /*
 397  * il4965_rs_collect_tx_data - Update the success/failure sliding win
 398  *
 399  * We keep a sliding win of the last 62 packets transmitted
 400  * at this rate.  win->data contains the bitmask of successful
 401  * packets.
 402  */
 403 static int
 404 il4965_rs_collect_tx_data(struct il_scale_tbl_info *tbl, int scale_idx,
 405                           int attempts, int successes)
 406 {
 407         struct il_rate_scale_data *win = NULL;
 408         static const u64 mask = (((u64) 1) << (RATE_MAX_WINDOW - 1));
 409         s32 fail_count, tpt;
 410
 411         if (scale_idx < 0 || scale_idx >= RATE_COUNT)
 412                 return -EINVAL;
 413
 414         /* Select win for current tx bit rate */
 415         win = &(tbl->win[scale_idx]);
 416
 417         /* Get expected throughput */
 418         tpt = il4965_get_expected_tpt(tbl, scale_idx);
 419
 420         /*
 421          * Keep track of only the latest 62 tx frame attempts in this rate's
 422          * history win; anything older isn't really relevant any more.
 423          * If we have filled up the sliding win, drop the oldest attempt;
 424          * if the oldest attempt (highest bit in bitmap) shows "success",
 425          * subtract "1" from the success counter (this is the main reason
 426          * we keep these bitmaps!).
 427          */
 428         while (attempts > 0) {
 429                 if (win->counter >= RATE_MAX_WINDOW) {
 430
 431                         /* remove earliest */
 432                         win->counter = RATE_MAX_WINDOW - 1;
 433
 434                         if (win->data & mask) {
 435                                 win->data &= ~mask;
 436                                 win->success_counter--;
 437                         }
 438                 }
 439
 440                 /* Increment frames-attempted counter */
 441                 win->counter++;
 442
 443                 /* Shift bitmap by one frame to throw away oldest history */
 444                 win->data <<= 1;
 445
 446                 /* Mark the most recent #successes attempts as successful */
 447                 if (successes > 0) {
 448                         win->success_counter++;
 449                         win->data |= 0x1;
 450                         successes--;
 451                 }
 452
 453                 attempts--;
 454         }
 455
 456         /* Calculate current success ratio, avoid divide-by-0! */
 457         if (win->counter > 0)
 458                 win->success_ratio =
 459                     128 * (100 * win->success_counter) / win->counter;
 460         else
 461                 win->success_ratio = IL_INVALID_VALUE;
 462
 463         fail_count = win->counter - win->success_counter;
 464
 465         /* Calculate average throughput, if we have enough history. */
 466         if (fail_count >= RATE_MIN_FAILURE_TH ||
 467             win->success_counter >= RATE_MIN_SUCCESS_TH)
 468                 win->average_tpt = (win->success_ratio * tpt + 64) / 128;
 469         else
 470                 win->average_tpt = IL_INVALID_VALUE;
 471
 472         /* Tag this win as having been updated */
 473         win->stamp = jiffies;
 474
 475         return 0;
 476 }
 477
 478 /*
 479  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 480  */
 481 static u32
 482 il4965_rate_n_flags_from_tbl(struct il_priv *il, struct il_scale_tbl_info *tbl,
 483                              int idx, u8 use_green)
 484 {
 485         u32 rate_n_flags = 0;
 486
 487         if (is_legacy(tbl->lq_type)) {
 488                 rate_n_flags = il_rates[idx].plcp;
 489                 if (idx >= IL_FIRST_CCK_RATE && idx <= IL_LAST_CCK_RATE)
 490                         rate_n_flags |= RATE_MCS_CCK_MSK;
 491
 492         } else if (is_Ht(tbl->lq_type)) {
 493                 if (idx > IL_LAST_OFDM_RATE) {
 494                         IL_ERR("Invalid HT rate idx %d\n", idx);
 495                         idx = IL_LAST_OFDM_RATE;
 496                 }
 497                 rate_n_flags = RATE_MCS_HT_MSK;
 498
 499                 if (is_siso(tbl->lq_type))
 500                         rate_n_flags |= il_rates[idx].plcp_siso;
 501                 else
 502                         rate_n_flags |= il_rates[idx].plcp_mimo2;
 503         } else {
 504                 IL_ERR("Invalid tbl->lq_type %d\n", tbl->lq_type);
 505         }
 506
 507         rate_n_flags |=
 508             ((tbl->ant_type << RATE_MCS_ANT_POS) & RATE_MCS_ANT_ABC_MSK);
 509
 510         if (is_Ht(tbl->lq_type)) {
 511                 if (tbl->is_ht40) {
 512                         if (tbl->is_dup)
 513                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 514                         else
 515                                 rate_n_flags |= RATE_MCS_HT40_MSK;
 516                 }
 517                 if (tbl->is_SGI)
 518                         rate_n_flags |= RATE_MCS_SGI_MSK;
 519
 520                 if (use_green) {
 521                         rate_n_flags |= RATE_MCS_GF_MSK;
 522                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 523                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 524                                 IL_ERR("GF was set with SGI:SISO\n");
 525                         }
 526                 }
 527         }
 528         return rate_n_flags;
 529 }
 530
 531 /*
 532  * Interpret uCode API's rate_n_flags format,
 533  * fill "search" or "active" tx mode table.
 534  */
 535 static int
 536 il4965_rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 537                                 enum nl80211_band band,
 538                                 struct il_scale_tbl_info *tbl, int *rate_idx)
 539 {
 540         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 541         u8 il4965_num_of_ant =
 542             il4965_get_il4965_num_of_ant_from_rate(rate_n_flags);
 543         u8 mcs;
 544
 545         memset(tbl, 0, sizeof(struct il_scale_tbl_info));
 546         *rate_idx = il4965_hwrate_to_plcp_idx(rate_n_flags);
 547
 548         if (*rate_idx == RATE_INVALID) {
 549                 *rate_idx = -1;
 550                 return -EINVAL;
 551         }
 552         tbl->is_SGI = 0;        /* default legacy setup */
 553         tbl->is_ht40 = 0;
 554         tbl->is_dup = 0;
 555         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 556         tbl->lq_type = LQ_NONE;
 557         tbl->max_search = IL_MAX_SEARCH;
 558
 559         /* legacy rate format */
 560         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 561                 if (il4965_num_of_ant == 1) {
 562                         if (band == NL80211_BAND_5GHZ)
 563                                 tbl->lq_type = LQ_A;
 564                         else
 565                                 tbl->lq_type = LQ_G;
 566                 }
 567                 /* HT rate format */
 568         } else {
 569                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 570                         tbl->is_SGI = 1;
 571
 572                 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
 573                     (rate_n_flags & RATE_MCS_DUP_MSK))
 574                         tbl->is_ht40 = 1;
 575
 576                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 577                         tbl->is_dup = 1;
 578
 579                 mcs = il4965_rs_extract_rate(rate_n_flags);
 580
 581                 /* SISO */
 582                 if (mcs <= RATE_SISO_60M_PLCP) {
 583                         if (il4965_num_of_ant == 1)
 584                                 tbl->lq_type = LQ_SISO; /*else NONE */
 585                         /* MIMO2 */
 586                 } else {
 587                         if (il4965_num_of_ant == 2)
 588                                 tbl->lq_type = LQ_MIMO2;
 589                 }
 590         }
 591         return 0;
 592 }
 593
 594 /* switch to another antenna/antennas and return 1 */
 595 /* if no other valid antenna found, return 0 */
 596 static int
 597 il4965_rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 598                          struct il_scale_tbl_info *tbl)
 599 {
 600         u8 new_ant_type;
 601
 602         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 603                 return 0;
 604
 605         if (!il4965_rs_is_valid_ant(valid_ant, tbl->ant_type))
 606                 return 0;
 607
 608         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 609
 610         while (new_ant_type != tbl->ant_type &&
 611                !il4965_rs_is_valid_ant(valid_ant, new_ant_type))
 612                 new_ant_type = ant_toggle_lookup[new_ant_type];
 613
 614         if (new_ant_type == tbl->ant_type)
 615                 return 0;
 616
 617         tbl->ant_type = new_ant_type;
 618         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 619         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 620         return 1;
 621 }
 622
 623 /*
 624  * Green-field mode is valid if the station supports it and
 625  * there are no non-GF stations present in the BSS.
 626  */
 627 static bool
 628 il4965_rs_use_green(struct il_priv *il, struct ieee80211_sta *sta)
 629 {
 630         return (sta->deflink.ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
 631                !il->ht.non_gf_sta_present;
 632 }
 633
 634 /*
 635  * il4965_rs_get_supported_rates - get the available rates
 636  *
 637  * if management frame or broadcast frame only return
 638  * basic available rates.
 639  *
 640  */
 641 static u16
 642 il4965_rs_get_supported_rates(struct il_lq_sta *lq_sta,
 643                               struct ieee80211_hdr *hdr,
 644                               enum il_table_type rate_type)
 645 {
 646         if (is_legacy(rate_type)) {
 647                 return lq_sta->active_legacy_rate;
 648         } else {
 649                 if (is_siso(rate_type))
 650                         return lq_sta->active_siso_rate;
 651                 else
 652                         return lq_sta->active_mimo2_rate;
 653         }
 654 }
 655
 656 static u16
 657 il4965_rs_get_adjacent_rate(struct il_priv *il, u8 idx, u16 rate_mask,
 658                             int rate_type)
 659 {
 660         u8 high = RATE_INVALID;
 661         u8 low = RATE_INVALID;
 662
 663         /* 802.11A or ht walks to the next literal adjacent rate in
 664          * the rate table */
 665         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 666                 int i;
 667                 u32 mask;
 668
 669                 /* Find the previous rate that is in the rate mask */
 670                 i = idx - 1;
 671                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 672                         if (rate_mask & mask) {
 673                                 low = i;
 674                                 break;
 675                         }
 676                 }
 677
 678                 /* Find the next rate that is in the rate mask */
 679                 i = idx + 1;
 680                 for (mask = (1 << i); i < RATE_COUNT; i++, mask <<= 1) {
 681                         if (rate_mask & mask) {
 682                                 high = i;
 683                                 break;
 684                         }
 685                 }
 686
 687                 return (high << 8) | low;
 688         }
 689
 690         low = idx;
 691         while (low != RATE_INVALID) {
 692                 low = il_rates[low].prev_rs;
 693                 if (low == RATE_INVALID)
 694                         break;
 695                 if (rate_mask & (1 << low))
 696                         break;
 697                 D_RATE("Skipping masked lower rate: %d\n", low);
 698         }
 699
 700         high = idx;
 701         while (high != RATE_INVALID) {
 702                 high = il_rates[high].next_rs;
 703                 if (high == RATE_INVALID)
 704                         break;
 705                 if (rate_mask & (1 << high))
 706                         break;
 707                 D_RATE("Skipping masked higher rate: %d\n", high);
 708         }
 709
 710         return (high << 8) | low;
 711 }
 712
 713 static u32
 714 il4965_rs_get_lower_rate(struct il_lq_sta *lq_sta,
 715                          struct il_scale_tbl_info *tbl, u8 scale_idx,
 716                          u8 ht_possible)
 717 {
 718         s32 low;
 719         u16 rate_mask;
 720         u16 high_low;
 721         u8 switch_to_legacy = 0;
 722         u8 is_green = lq_sta->is_green;
 723         struct il_priv *il = lq_sta->drv;
 724
 725         /* check if we need to switch from HT to legacy rates.
 726          * assumption is that mandatory rates (1Mbps or 6Mbps)
 727          * are always supported (spec demand) */
 728         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_idx)) {
 729                 switch_to_legacy = 1;
 730                 scale_idx = rs_ht_to_legacy[scale_idx];
 731                 if (lq_sta->band == NL80211_BAND_5GHZ)
 732                         tbl->lq_type = LQ_A;
 733                 else
 734                         tbl->lq_type = LQ_G;
 735
 736                 if (il4965_num_of_ant(tbl->ant_type) > 1)
 737                         tbl->ant_type =
 738                             il4965_first_antenna(il->hw_params.valid_tx_ant);
 739
 740                 tbl->is_ht40 = 0;
 741                 tbl->is_SGI = 0;
 742                 tbl->max_search = IL_MAX_SEARCH;
 743         }
 744
 745         rate_mask = il4965_rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 746
 747         /* Mask with station rate restriction */
 748         if (is_legacy(tbl->lq_type)) {
 749                 /* supp_rates has no CCK bits in A mode */
 750                 if (lq_sta->band == NL80211_BAND_5GHZ)
 751                         rate_mask =
 752                             (u16) (rate_mask &
 753                                    (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
 754                 else
 755                         rate_mask = (u16) (rate_mask & lq_sta->supp_rates);
 756         }
 757
 758         /* If we switched from HT to legacy, check current rate */
 759         if (switch_to_legacy && (rate_mask & (1 << scale_idx))) {
 760                 low = scale_idx;
 761                 goto out;
 762         }
 763
 764         high_low =
 765             il4965_rs_get_adjacent_rate(lq_sta->drv, scale_idx, rate_mask,
 766                                         tbl->lq_type);
 767         low = high_low & 0xff;
 768
 769         if (low == RATE_INVALID)
 770                 low = scale_idx;
 771
 772 out:
 773         return il4965_rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 774 }
 775
 776 /*
 777  * Simple function to compare two rate scale table types
 778  */
 779 static bool
 780 il4965_table_type_matches(struct il_scale_tbl_info *a,
 781                           struct il_scale_tbl_info *b)
 782 {
 783         return (a->lq_type == b->lq_type && a->ant_type == b->ant_type &&
 784                 a->is_SGI == b->is_SGI);
 785 }
 786
 787 /*
 788  * mac80211 sends us Tx status
 789  */
 790 static void
 791 il4965_rs_tx_status(void *il_r, struct ieee80211_supported_band *sband,
 792                     struct ieee80211_sta *sta, void *il_sta,
 793                     struct sk_buff *skb)
 794 {
 795         int legacy_success;
 796         int retries;
 797         int rs_idx, mac_idx, i;
 798         struct il_lq_sta *lq_sta = il_sta;
 799         struct il_link_quality_cmd *table;
 800         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 801         struct il_priv *il = (struct il_priv *)il_r;
 802         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 803         enum mac80211_rate_control_flags mac_flags;
 804         u32 tx_rate;
 805         struct il_scale_tbl_info tbl_type;
 806         struct il_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 807
 808         D_RATE("get frame ack response, update rate scale win\n");
 809
 810         /* Treat uninitialized rate scaling data same as non-existing. */
 811         if (!lq_sta) {
 812                 D_RATE("Station rate scaling not created yet.\n");
 813                 return;
 814         } else if (!lq_sta->drv) {
 815                 D_RATE("Rate scaling not initialized yet.\n");
 816                 return;
 817         }
 818
 819         if (!ieee80211_is_data(hdr->frame_control) ||
 820             (info->flags & IEEE80211_TX_CTL_NO_ACK))
 821                 return;
 822
 823         /* This packet was aggregated but doesn't carry status info */
 824         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 825             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 826                 return;
 827
 828         /*
 829          * Ignore this Tx frame response if its initial rate doesn't match
 830          * that of latest Link Quality command.  There may be stragglers
 831          * from a previous Link Quality command, but we're no longer interested
 832          * in those; they're either from the "active" mode while we're trying
 833          * to check "search" mode, or a prior "search" mode after we've moved
 834          * to a new "search" mode (which might become the new "active" mode).
 835          */
 836         table = &lq_sta->lq;
 837         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 838         il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type, &rs_idx);
 839         if (il->band == NL80211_BAND_5GHZ)
 840                 rs_idx -= IL_FIRST_OFDM_RATE;
 841         mac_flags = info->status.rates[0].flags;
 842         mac_idx = info->status.rates[0].idx;
 843         /* For HT packets, map MCS to PLCP */
 844         if (mac_flags & IEEE80211_TX_RC_MCS) {
 845                 mac_idx &= RATE_MCS_CODE_MSK;   /* Remove # of streams */
 846                 if (mac_idx >= (RATE_9M_IDX - IL_FIRST_OFDM_RATE))
 847                         mac_idx++;
 848                 /*
 849                  * mac80211 HT idx is always zero-idxed; we need to move
 850                  * HT OFDM rates after CCK rates in 2.4 GHz band
 851                  */
 852                 if (il->band == NL80211_BAND_2GHZ)
 853                         mac_idx += IL_FIRST_OFDM_RATE;
 854         }
 855         /* Here we actually compare this rate to the latest LQ command */
 856         if (mac_idx < 0 ||
 857             tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI) ||
 858             tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ||
 859             tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA) ||
 860             tbl_type.ant_type != info->status.antenna ||
 861             !!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)
 862             || !!(tx_rate & RATE_MCS_GF_MSK) !=
 863             !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD) || rs_idx != mac_idx) {
 864                 D_RATE("initial rate %d does not match %d (0x%x)\n", mac_idx,
 865                        rs_idx, tx_rate);
 866                 /*
 867                  * Since rates mis-match, the last LQ command may have failed.
 868                  * After IL_MISSED_RATE_MAX mis-matches, resync the uCode with
 869                  * ... driver.
 870                  */
 871                 lq_sta->missed_rate_counter++;
 872                 if (lq_sta->missed_rate_counter > IL_MISSED_RATE_MAX) {
 873                         lq_sta->missed_rate_counter = 0;
 874                         il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
 875                 }
 876                 /* Regardless, ignore this status info for outdated rate */
 877                 return;
 878         } else
 879                 /* Rate did match, so reset the missed_rate_counter */
 880                 lq_sta->missed_rate_counter = 0;
 881
 882         /* Figure out if rate scale algorithm is in active or search table */
 883         if (il4965_table_type_matches
 884             (&tbl_type, &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 885                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 886                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 887         } else
 888             if (il4965_table_type_matches
 889                 (&tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
 890                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 891                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 892         } else {
 893                 D_RATE("Neither active nor search matches tx rate\n");
 894                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 895                 D_RATE("active- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
 896                        tmp_tbl->ant_type, tmp_tbl->is_SGI);
 897                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 898                 D_RATE("search- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
 899                        tmp_tbl->ant_type, tmp_tbl->is_SGI);
 900                 D_RATE("actual- lq:%x, ant:%x, SGI:%d\n", tbl_type.lq_type,
 901                        tbl_type.ant_type, tbl_type.is_SGI);
 902                 /*
 903                  * no matching table found, let's by-pass the data collection
 904                  * and continue to perform rate scale to find the rate table
 905                  */
 906                 il4965_rs_stay_in_table(lq_sta, true);
 907                 goto done;
 908         }
 909
 910         /*
 911          * Updating the frame history depends on whether packets were
 912          * aggregated.
 913          *
 914          * For aggregation, all packets were transmitted at the same rate, the
 915          * first idx into rate scale table.
 916          */
 917         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
 918                 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 919                 il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type,
 920                                                 &rs_idx);
 921                 il4965_rs_collect_tx_data(curr_tbl, rs_idx,
 922                                           info->status.ampdu_len,
 923                                           info->status.ampdu_ack_len);
 924
 925                 /* Update success/fail counts if not searching for new mode */
 926                 if (lq_sta->stay_in_tbl) {
 927                         lq_sta->total_success += info->status.ampdu_ack_len;
 928                         lq_sta->total_failed +=
 929                             (info->status.ampdu_len -
 930                              info->status.ampdu_ack_len);
 931                 }
 932         } else {
 933                 /*
 934                  * For legacy, update frame history with for each Tx retry.
 935                  */
 936                 retries = info->status.rates[0].count - 1;
 937                 /* HW doesn't send more than 15 retries */
 938                 retries = min(retries, 15);
 939
 940                 /* The last transmission may have been successful */
 941                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
 942                 /* Collect data for each rate used during failed TX attempts */
 943                 for (i = 0; i <= retries; ++i) {
 944                         tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
 945                         il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band,
 946                                                         &tbl_type, &rs_idx);
 947                         /*
 948                          * Only collect stats if retried rate is in the same RS
 949                          * table as active/search.
 950                          */
 951                         if (il4965_table_type_matches(&tbl_type, curr_tbl))
 952                                 tmp_tbl = curr_tbl;
 953                         else if (il4965_table_type_matches
 954                                  (&tbl_type, other_tbl))
 955                                 tmp_tbl = other_tbl;
 956                         else
 957                                 continue;
 958                         il4965_rs_collect_tx_data(tmp_tbl, rs_idx, 1,
 959                                                   i <
 960                                                   retries ? 0 : legacy_success);
 961                 }
 962
 963                 /* Update success/fail counts if not searching for new mode */
 964                 if (lq_sta->stay_in_tbl) {
 965                         lq_sta->total_success += legacy_success;
 966                         lq_sta->total_failed += retries + (1 - legacy_success);
 967                 }
 968         }
 969         /* The last TX rate is cached in lq_sta; it's set in if/else above */
 970         lq_sta->last_rate_n_flags = tx_rate;
 971 done:
 972         /* See if there's a better rate or modulation mode to try. */
 973         if (sta->deflink.supp_rates[sband->band])
 974                 il4965_rs_rate_scale_perform(il, skb, sta, lq_sta);
 975 }
 976
 977 /*
 978  * Begin a period of staying with a selected modulation mode.
 979  * Set "stay_in_tbl" flag to prevent any mode switches.
 980  * Set frame tx success limits according to legacy vs. high-throughput,
 981  * and reset overall (spanning all rates) tx success history stats.
 982  * These control how long we stay using same modulation mode before
 983  * searching for a new mode.
 984  */
 985 static void
 986 il4965_rs_set_stay_in_table(struct il_priv *il, u8 is_legacy,
 987                             struct il_lq_sta *lq_sta)
 988 {
 989         D_RATE("we are staying in the same table\n");
 990         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
 991         if (is_legacy) {
 992                 lq_sta->table_count_limit = IL_LEGACY_TBL_COUNT;
 993                 lq_sta->max_failure_limit = IL_LEGACY_FAILURE_LIMIT;
 994                 lq_sta->max_success_limit = IL_LEGACY_SUCCESS_LIMIT;
 995         } else {
 996                 lq_sta->table_count_limit = IL_NONE_LEGACY_TBL_COUNT;
 997                 lq_sta->max_failure_limit = IL_NONE_LEGACY_FAILURE_LIMIT;
 998                 lq_sta->max_success_limit = IL_NONE_LEGACY_SUCCESS_LIMIT;
 999         }
1000         lq_sta->table_count = 0;
1001         lq_sta->total_failed = 0;
1002         lq_sta->total_success = 0;
1003         lq_sta->flush_timer = jiffies;
1004         lq_sta->action_counter = 0;
1005 }
1006
1007 /*
1008  * Find correct throughput table for given mode of modulation
1009  */
1010 static void
1011 il4965_rs_set_expected_tpt_table(struct il_lq_sta *lq_sta,
1012                                  struct il_scale_tbl_info *tbl)
1013 {
1014         /* Used to choose among HT tables */
1015         s32(*ht_tbl_pointer)[RATE_COUNT];
1016
1017         /* Check for invalid LQ type */
1018         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1019                 tbl->expected_tpt = expected_tpt_legacy;
1020                 return;
1021         }
1022
1023         /* Legacy rates have only one table */
1024         if (is_legacy(tbl->lq_type)) {
1025                 tbl->expected_tpt = expected_tpt_legacy;
1026                 return;
1027         }
1028
1029         /* Choose among many HT tables depending on number of streams
1030          * (SISO/MIMO2), channel width (20/40), SGI, and aggregation
1031          * status */
1032         if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1033                 ht_tbl_pointer = expected_tpt_siso20MHz;
1034         else if (is_siso(tbl->lq_type))
1035                 ht_tbl_pointer = expected_tpt_siso40MHz;
1036         else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1037                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1038         else                    /* if (is_mimo2(tbl->lq_type)) <-- must be true */
1039                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1040
1041         if (!tbl->is_SGI && !lq_sta->is_agg)    /* Normal */
1042                 tbl->expected_tpt = ht_tbl_pointer[0];
1043         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1044                 tbl->expected_tpt = ht_tbl_pointer[1];
1045         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1046                 tbl->expected_tpt = ht_tbl_pointer[2];
1047         else                    /* AGG+SGI */
1048                 tbl->expected_tpt = ht_tbl_pointer[3];
1049 }
1050
1051 /*
1052  * Find starting rate for new "search" high-throughput mode of modulation.
1053  * Goal is to find lowest expected rate (under perfect conditions) that is
1054  * above the current measured throughput of "active" mode, to give new mode
1055  * a fair chance to prove itself without too many challenges.
1056  *
1057  * This gets called when transitioning to more aggressive modulation
1058  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1059  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1060  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1061  * bit rate will typically need to increase, but not if performance was bad.
1062  */
1063 static s32
1064 il4965_rs_get_best_rate(struct il_priv *il, struct il_lq_sta *lq_sta,
1065                         struct il_scale_tbl_info *tbl,  /* "search" */
1066                         u16 rate_mask, s8 idx)
1067 {
1068         /* "active" values */
1069         struct il_scale_tbl_info *active_tbl =
1070             &(lq_sta->lq_info[lq_sta->active_tbl]);
1071         s32 active_sr = active_tbl->win[idx].success_ratio;
1072         s32 active_tpt = active_tbl->expected_tpt[idx];
1073
1074         /* expected "search" throughput */
1075         s32 *tpt_tbl = tbl->expected_tpt;
1076
1077         s32 new_rate, high, low, start_hi;
1078         u16 high_low;
1079         s8 rate = idx;
1080
1081         new_rate = high = low = start_hi = RATE_INVALID;
1082
1083         for (;;) {
1084                 high_low =
1085                     il4965_rs_get_adjacent_rate(il, rate, rate_mask,
1086                                                 tbl->lq_type);
1087
1088                 low = high_low & 0xff;
1089                 high = (high_low >> 8) & 0xff;
1090
1091                 /*
1092                  * Lower the "search" bit rate, to give new "search" mode
1093                  * approximately the same throughput as "active" if:
1094                  *
1095                  * 1) "Active" mode has been working modestly well (but not
1096                  *    great), and expected "search" throughput (under perfect
1097                  *    conditions) at candidate rate is above the actual
1098                  *    measured "active" throughput (but less than expected
1099                  *    "active" throughput under perfect conditions).
1100                  * OR
1101                  * 2) "Active" mode has been working perfectly or very well
1102                  *    and expected "search" throughput (under perfect
1103                  *    conditions) at candidate rate is above expected
1104                  *    "active" throughput (under perfect conditions).
1105                  */
1106                 if ((100 * tpt_tbl[rate] > lq_sta->last_tpt &&
1107                      (active_sr > RATE_DECREASE_TH && active_sr <= RATE_HIGH_TH
1108                       && tpt_tbl[rate] <= active_tpt)) ||
1109                     (active_sr >= RATE_SCALE_SWITCH &&
1110                      tpt_tbl[rate] > active_tpt)) {
1111
1112                         /* (2nd or later pass)
1113                          * If we've already tried to raise the rate, and are
1114                          * now trying to lower it, use the higher rate. */
1115                         if (start_hi != RATE_INVALID) {
1116                                 new_rate = start_hi;
1117                                 break;
1118                         }
1119
1120                         new_rate = rate;
1121
1122                         /* Loop again with lower rate */
1123                         if (low != RATE_INVALID)
1124                                 rate = low;
1125
1126                         /* Lower rate not available, use the original */
1127                         else
1128                                 break;
1129
1130                         /* Else try to raise the "search" rate to match "active" */
1131                 } else {
1132                         /* (2nd or later pass)
1133                          * If we've already tried to lower the rate, and are
1134                          * now trying to raise it, use the lower rate. */
1135                         if (new_rate != RATE_INVALID)
1136                                 break;
1137
1138                         /* Loop again with higher rate */
1139                         else if (high != RATE_INVALID) {
1140                                 start_hi = high;
1141                                 rate = high;
1142
1143                                 /* Higher rate not available, use the original */
1144                         } else {
1145                                 new_rate = rate;
1146                                 break;
1147                         }
1148                 }
1149         }
1150
1151         return new_rate;
1152 }
1153
1154 /*
1155  * Set up search table for MIMO2
1156  */
1157 static int
1158 il4965_rs_switch_to_mimo2(struct il_priv *il, struct il_lq_sta *lq_sta,
1159                           struct ieee80211_conf *conf,
1160                           struct ieee80211_sta *sta,
1161                           struct il_scale_tbl_info *tbl, int idx)
1162 {
1163         u16 rate_mask;
1164         s32 rate;
1165         s8 is_green = lq_sta->is_green;
1166
1167         if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported)
1168                 return -1;
1169
1170         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1171                 return -1;
1172
1173         /* Need both Tx chains/antennas to support MIMO */
1174         if (il->hw_params.tx_chains_num < 2)
1175                 return -1;
1176
1177         D_RATE("LQ: try to switch to MIMO2\n");
1178
1179         tbl->lq_type = LQ_MIMO2;
1180         tbl->is_dup = lq_sta->is_dup;
1181         tbl->action = 0;
1182         tbl->max_search = IL_MAX_SEARCH;
1183         rate_mask = lq_sta->active_mimo2_rate;
1184
1185         if (il_is_ht40_tx_allowed(il, &sta->deflink.ht_cap))
1186                 tbl->is_ht40 = 1;
1187         else
1188                 tbl->is_ht40 = 0;
1189
1190         il4965_rs_set_expected_tpt_table(lq_sta, tbl);
1191
1192         rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
1193
1194         D_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1195         if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
1196                 D_RATE("Can't switch with idx %d rate mask %x\n", rate,
1197                        rate_mask);
1198                 return -1;
1199         }
1200         tbl->current_rate =
1201             il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
1202
1203         D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
1204                is_green);
1205         return 0;
1206 }
1207
1208 /*
1209  * Set up search table for SISO
1210  */
1211 static int
1212 il4965_rs_switch_to_siso(struct il_priv *il, struct il_lq_sta *lq_sta,
1213                          struct ieee80211_conf *conf, struct ieee80211_sta *sta,
1214                          struct il_scale_tbl_info *tbl, int idx)
1215 {
1216         u16 rate_mask;
1217         u8 is_green = lq_sta->is_green;
1218         s32 rate;
1219
1220         if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported)
1221                 return -1;
1222
1223         D_RATE("LQ: try to switch to SISO\n");
1224
1225         tbl->is_dup = lq_sta->is_dup;
1226         tbl->lq_type = LQ_SISO;
1227         tbl->action = 0;
1228         tbl->max_search = IL_MAX_SEARCH;
1229         rate_mask = lq_sta->active_siso_rate;
1230
1231         if (il_is_ht40_tx_allowed(il, &sta->deflink.ht_cap))
1232                 tbl->is_ht40 = 1;
1233         else
1234                 tbl->is_ht40 = 0;
1235
1236         if (is_green)
1237                 tbl->is_SGI = 0;        /*11n spec: no SGI in SISO+Greenfield */
1238
1239         il4965_rs_set_expected_tpt_table(lq_sta, tbl);
1240         rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
1241
1242         D_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1243         if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
1244                 D_RATE("can not switch with idx %d rate mask %x\n", rate,
1245                        rate_mask);
1246                 return -1;
1247         }
1248         tbl->current_rate =
1249             il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
1250         D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
1251                is_green);
1252         return 0;
1253 }
1254
1255 /*
1256  * Try to switch to new modulation mode from legacy
1257  */
1258 static int
1259 il4965_rs_move_legacy_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1260                             struct ieee80211_conf *conf,
1261                             struct ieee80211_sta *sta, int idx)
1262 {
1263         struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1264         struct il_scale_tbl_info *search_tbl =
1265             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1266         struct il_rate_scale_data *win = &(tbl->win[idx]);
1267         u32 sz =
1268             (sizeof(struct il_scale_tbl_info) -
1269              (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1270         u8 start_action;
1271         u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1272         u8 tx_chains_num = il->hw_params.tx_chains_num;
1273         int ret = 0;
1274         u8 update_search_tbl_counter = 0;
1275
1276         tbl->action = IL_LEGACY_SWITCH_SISO;
1277
1278         start_action = tbl->action;
1279         for (;;) {
1280                 lq_sta->action_counter++;
1281                 switch (tbl->action) {
1282                 case IL_LEGACY_SWITCH_ANTENNA1:
1283                 case IL_LEGACY_SWITCH_ANTENNA2:
1284                         D_RATE("LQ: Legacy toggle Antenna\n");
1285
1286                         if ((tbl->action == IL_LEGACY_SWITCH_ANTENNA1 &&
1287                              tx_chains_num <= 1) ||
1288                             (tbl->action == IL_LEGACY_SWITCH_ANTENNA2 &&
1289                              tx_chains_num <= 2))
1290                                 break;
1291
1292                         /* Don't change antenna if success has been great */
1293                         if (win->success_ratio >= IL_RS_GOOD_RATIO)
1294                                 break;
1295
1296                         /* Set up search table to try other antenna */
1297                         memcpy(search_tbl, tbl, sz);
1298
1299                         if (il4965_rs_toggle_antenna
1300                             (valid_tx_ant, &search_tbl->current_rate,
1301                              search_tbl)) {
1302                                 update_search_tbl_counter = 1;
1303                                 il4965_rs_set_expected_tpt_table(lq_sta,
1304                                                                  search_tbl);
1305                                 goto out;
1306                         }
1307                         break;
1308                 case IL_LEGACY_SWITCH_SISO:
1309                         D_RATE("LQ: Legacy switch to SISO\n");
1310
1311                         /* Set up search table to try SISO */
1312                         memcpy(search_tbl, tbl, sz);
1313                         search_tbl->is_SGI = 0;
1314                         ret =
1315                             il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
1316                                                      search_tbl, idx);
1317                         if (!ret) {
1318                                 lq_sta->action_counter = 0;
1319                                 goto out;
1320                         }
1321
1322                         break;
1323                 case IL_LEGACY_SWITCH_MIMO2_AB:
1324                 case IL_LEGACY_SWITCH_MIMO2_AC:
1325                 case IL_LEGACY_SWITCH_MIMO2_BC:
1326                         D_RATE("LQ: Legacy switch to MIMO2\n");
1327
1328                         /* Set up search table to try MIMO */
1329                         memcpy(search_tbl, tbl, sz);
1330                         search_tbl->is_SGI = 0;
1331
1332                         if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AB)
1333                                 search_tbl->ant_type = ANT_AB;
1334                         else if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AC)
1335                                 search_tbl->ant_type = ANT_AC;
1336                         else
1337                                 search_tbl->ant_type = ANT_BC;
1338
1339                         if (!il4965_rs_is_valid_ant
1340                             (valid_tx_ant, search_tbl->ant_type))
1341                                 break;
1342
1343                         ret =
1344                             il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
1345                                                       search_tbl, idx);
1346                         if (!ret) {
1347                                 lq_sta->action_counter = 0;
1348                                 goto out;
1349                         }
1350                         break;
1351                 }
1352                 tbl->action++;
1353                 if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
1354                         tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
1355
1356                 if (tbl->action == start_action)
1357                         break;
1358
1359         }
1360         search_tbl->lq_type = LQ_NONE;
1361         return 0;
1362
1363 out:
1364         lq_sta->search_better_tbl = 1;
1365         tbl->action++;
1366         if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
1367                 tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
1368         if (update_search_tbl_counter)
1369                 search_tbl->action = tbl->action;
1370         return 0;
1371
1372 }
1373
1374 /*
1375  * Try to switch to new modulation mode from SISO
1376  */
1377 static int
1378 il4965_rs_move_siso_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1379                              struct ieee80211_conf *conf,
1380                              struct ieee80211_sta *sta, int idx)
1381 {
1382         u8 is_green = lq_sta->is_green;
1383         struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1384         struct il_scale_tbl_info *search_tbl =
1385             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1386         struct il_rate_scale_data *win = &(tbl->win[idx]);
1387         struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
1388         u32 sz =
1389             (sizeof(struct il_scale_tbl_info) -
1390              (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1391         u8 start_action;
1392         u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1393         u8 tx_chains_num = il->hw_params.tx_chains_num;
1394         u8 update_search_tbl_counter = 0;
1395         int ret;
1396
1397         start_action = tbl->action;
1398
1399         for (;;) {
1400                 lq_sta->action_counter++;
1401                 switch (tbl->action) {
1402                 case IL_SISO_SWITCH_ANTENNA1:
1403                 case IL_SISO_SWITCH_ANTENNA2:
1404                         D_RATE("LQ: SISO toggle Antenna\n");
1405                         if ((tbl->action == IL_SISO_SWITCH_ANTENNA1 &&
1406                              tx_chains_num <= 1) ||
1407                             (tbl->action == IL_SISO_SWITCH_ANTENNA2 &&
1408                              tx_chains_num <= 2))
1409                                 break;
1410
1411                         if (win->success_ratio >= IL_RS_GOOD_RATIO)
1412                                 break;
1413
1414                         memcpy(search_tbl, tbl, sz);
1415                         if (il4965_rs_toggle_antenna
1416                             (valid_tx_ant, &search_tbl->current_rate,
1417                              search_tbl)) {
1418                                 update_search_tbl_counter = 1;
1419                                 goto out;
1420                         }
1421                         break;
1422                 case IL_SISO_SWITCH_MIMO2_AB:
1423                 case IL_SISO_SWITCH_MIMO2_AC:
1424                 case IL_SISO_SWITCH_MIMO2_BC:
1425                         D_RATE("LQ: SISO switch to MIMO2\n");
1426                         memcpy(search_tbl, tbl, sz);
1427                         search_tbl->is_SGI = 0;
1428
1429                         if (tbl->action == IL_SISO_SWITCH_MIMO2_AB)
1430                                 search_tbl->ant_type = ANT_AB;
1431                         else if (tbl->action == IL_SISO_SWITCH_MIMO2_AC)
1432                                 search_tbl->ant_type = ANT_AC;
1433                         else
1434                                 search_tbl->ant_type = ANT_BC;
1435
1436                         if (!il4965_rs_is_valid_ant
1437                             (valid_tx_ant, search_tbl->ant_type))
1438                                 break;
1439
1440                         ret =
1441                             il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
1442                                                       search_tbl, idx);
1443                         if (!ret)
1444                                 goto out;
1445                         break;
1446                 case IL_SISO_SWITCH_GI:
1447                         if (!tbl->is_ht40 &&
1448                             !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
1449                                 break;
1450                         if (tbl->is_ht40 &&
1451                             !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
1452                                 break;
1453
1454                         D_RATE("LQ: SISO toggle SGI/NGI\n");
1455
1456                         memcpy(search_tbl, tbl, sz);
1457                         if (is_green) {
1458                                 if (!tbl->is_SGI)
1459                                         break;
1460                                 else
1461                                         IL_ERR("SGI was set in GF+SISO\n");
1462                         }
1463                         search_tbl->is_SGI = !tbl->is_SGI;
1464                         il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1465                         if (tbl->is_SGI) {
1466                                 s32 tpt = lq_sta->last_tpt / 100;
1467                                 if (tpt >= search_tbl->expected_tpt[idx])
1468                                         break;
1469                         }
1470                         search_tbl->current_rate =
1471                             il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
1472                                                          is_green);
1473                         update_search_tbl_counter = 1;
1474                         goto out;
1475                 }
1476                 tbl->action++;
1477                 if (tbl->action > IL_SISO_SWITCH_GI)
1478                         tbl->action = IL_SISO_SWITCH_ANTENNA1;
1479
1480                 if (tbl->action == start_action)
1481                         break;
1482         }
1483         search_tbl->lq_type = LQ_NONE;
1484         return 0;
1485
1486 out:
1487         lq_sta->search_better_tbl = 1;
1488         tbl->action++;
1489         if (tbl->action > IL_SISO_SWITCH_GI)
1490                 tbl->action = IL_SISO_SWITCH_ANTENNA1;
1491         if (update_search_tbl_counter)
1492                 search_tbl->action = tbl->action;
1493
1494         return 0;
1495 }
1496
1497 /*
1498  * Try to switch to new modulation mode from MIMO2
1499  */
1500 static int
1501 il4965_rs_move_mimo2_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1502                               struct ieee80211_conf *conf,
1503                               struct ieee80211_sta *sta, int idx)
1504 {
1505         s8 is_green = lq_sta->is_green;
1506         struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1507         struct il_scale_tbl_info *search_tbl =
1508             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1509         struct il_rate_scale_data *win = &(tbl->win[idx]);
1510         struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
1511         u32 sz =
1512             (sizeof(struct il_scale_tbl_info) -
1513              (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1514         u8 start_action;
1515         u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1516         u8 tx_chains_num = il->hw_params.tx_chains_num;
1517         u8 update_search_tbl_counter = 0;
1518         int ret;
1519
1520         start_action = tbl->action;
1521         for (;;) {
1522                 lq_sta->action_counter++;
1523                 switch (tbl->action) {
1524                 case IL_MIMO2_SWITCH_ANTENNA1:
1525                 case IL_MIMO2_SWITCH_ANTENNA2:
1526                         D_RATE("LQ: MIMO2 toggle Antennas\n");
1527
1528                         if (tx_chains_num <= 2)
1529                                 break;
1530
1531                         if (win->success_ratio >= IL_RS_GOOD_RATIO)
1532                                 break;
1533
1534                         memcpy(search_tbl, tbl, sz);
1535                         if (il4965_rs_toggle_antenna
1536                             (valid_tx_ant, &search_tbl->current_rate,
1537                              search_tbl)) {
1538                                 update_search_tbl_counter = 1;
1539                                 goto out;
1540                         }
1541                         break;
1542                 case IL_MIMO2_SWITCH_SISO_A:
1543                 case IL_MIMO2_SWITCH_SISO_B:
1544                 case IL_MIMO2_SWITCH_SISO_C:
1545                         D_RATE("LQ: MIMO2 switch to SISO\n");
1546
1547                         /* Set up new search table for SISO */
1548                         memcpy(search_tbl, tbl, sz);
1549
1550                         if (tbl->action == IL_MIMO2_SWITCH_SISO_A)
1551                                 search_tbl->ant_type = ANT_A;
1552                         else if (tbl->action == IL_MIMO2_SWITCH_SISO_B)
1553                                 search_tbl->ant_type = ANT_B;
1554                         else
1555                                 search_tbl->ant_type = ANT_C;
1556
1557                         if (!il4965_rs_is_valid_ant
1558                             (valid_tx_ant, search_tbl->ant_type))
1559                                 break;
1560
1561                         ret =
1562                             il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
1563                                                      search_tbl, idx);
1564                         if (!ret)
1565                                 goto out;
1566
1567                         break;
1568
1569                 case IL_MIMO2_SWITCH_GI:
1570                         if (!tbl->is_ht40 &&
1571                             !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
1572                                 break;
1573                         if (tbl->is_ht40 &&
1574                             !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
1575                                 break;
1576
1577                         D_RATE("LQ: MIMO2 toggle SGI/NGI\n");
1578
1579                         /* Set up new search table for MIMO2 */
1580                         memcpy(search_tbl, tbl, sz);
1581                         search_tbl->is_SGI = !tbl->is_SGI;
1582                         il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1583                         /*
1584                          * If active table already uses the fastest possible
1585                          * modulation (dual stream with short guard interval),
1586                          * and it's working well, there's no need to look
1587                          * for a better type of modulation!
1588                          */
1589                         if (tbl->is_SGI) {
1590                                 s32 tpt = lq_sta->last_tpt / 100;
1591                                 if (tpt >= search_tbl->expected_tpt[idx])
1592                                         break;
1593                         }
1594                         search_tbl->current_rate =
1595                             il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
1596                                                          is_green);
1597                         update_search_tbl_counter = 1;
1598                         goto out;
1599
1600                 }
1601                 tbl->action++;
1602                 if (tbl->action > IL_MIMO2_SWITCH_GI)
1603                         tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
1604
1605                 if (tbl->action == start_action)
1606                         break;
1607         }
1608         search_tbl->lq_type = LQ_NONE;
1609         return 0;
1610 out:
1611         lq_sta->search_better_tbl = 1;
1612         tbl->action++;
1613         if (tbl->action > IL_MIMO2_SWITCH_GI)
1614                 tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
1615         if (update_search_tbl_counter)
1616                 search_tbl->action = tbl->action;
1617
1618         return 0;
1619
1620 }
1621
1622 /*
1623  * Check whether we should continue using same modulation mode, or
1624  * begin search for a new mode, based on:
1625  * 1) # tx successes or failures while using this mode
1626  * 2) # times calling this function
1627  * 3) elapsed time in this mode (not used, for now)
1628  */
1629 static void
1630 il4965_rs_stay_in_table(struct il_lq_sta *lq_sta, bool force_search)
1631 {
1632         struct il_scale_tbl_info *tbl;
1633         int i;
1634         int active_tbl;
1635         int flush_interval_passed = 0;
1636         struct il_priv *il;
1637
1638         il = lq_sta->drv;
1639         active_tbl = lq_sta->active_tbl;
1640
1641         tbl = &(lq_sta->lq_info[active_tbl]);
1642
1643         /* If we've been disallowing search, see if we should now allow it */
1644         if (lq_sta->stay_in_tbl) {
1645
1646                 /* Elapsed time using current modulation mode */
1647                 if (lq_sta->flush_timer)
1648                         flush_interval_passed =
1649                             time_after(jiffies,
1650                                        (unsigned long)(lq_sta->flush_timer +
1651                                                        RATE_SCALE_FLUSH_INTVL));
1652
1653                 /*
1654                  * Check if we should allow search for new modulation mode.
1655                  * If many frames have failed or succeeded, or we've used
1656                  * this same modulation for a long time, allow search, and
1657                  * reset history stats that keep track of whether we should
1658                  * allow a new search.  Also (below) reset all bitmaps and
1659                  * stats in active history.
1660                  */
1661                 if (force_search ||
1662                     lq_sta->total_failed > lq_sta->max_failure_limit ||
1663                     lq_sta->total_success > lq_sta->max_success_limit ||
1664                     (!lq_sta->search_better_tbl && lq_sta->flush_timer &&
1665                      flush_interval_passed)) {
1666                         D_RATE("LQ: stay is expired %d %d %d\n",
1667                                lq_sta->total_failed, lq_sta->total_success,
1668                                flush_interval_passed);
1669
1670                         /* Allow search for new mode */
1671                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1672                         lq_sta->total_failed = 0;
1673                         lq_sta->total_success = 0;
1674                         lq_sta->flush_timer = 0;
1675
1676                         /*
1677                          * Else if we've used this modulation mode enough repetitions
1678                          * (regardless of elapsed time or success/failure), reset
1679                          * history bitmaps and rate-specific stats for all rates in
1680                          * active table.
1681                          */
1682                 } else {
1683                         lq_sta->table_count++;
1684                         if (lq_sta->table_count >= lq_sta->table_count_limit) {
1685                                 lq_sta->table_count = 0;
1686
1687                                 D_RATE("LQ: stay in table clear win\n");
1688                                 for (i = 0; i < RATE_COUNT; i++)
1689                                         il4965_rs_rate_scale_clear_win(&
1690                                                                        (tbl->
1691                                                                         win
1692                                                                         [i]));
1693                         }
1694                 }
1695
1696                 /* If transitioning to allow "search", reset all history
1697                  * bitmaps and stats in active table (this will become the new
1698                  * "search" table). */
1699                 if (!lq_sta->stay_in_tbl) {
1700                         for (i = 0; i < RATE_COUNT; i++)
1701                                 il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
1702                 }
1703         }
1704 }
1705
1706 /*
1707  * setup rate table in uCode
1708  */
1709 static void
1710 il4965_rs_update_rate_tbl(struct il_priv *il, struct il_lq_sta *lq_sta,
1711                           struct il_scale_tbl_info *tbl, int idx, u8 is_green)
1712 {
1713         u32 rate;
1714
1715         /* Update uCode's rate table. */
1716         rate = il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
1717         il4965_rs_fill_link_cmd(il, lq_sta, rate);
1718         il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
1719 }
1720
1721 /*
1722  * Do rate scaling and search for new modulation mode.
1723  */
1724 static void
1725 il4965_rs_rate_scale_perform(struct il_priv *il, struct sk_buff *skb,
1726                              struct ieee80211_sta *sta,
1727                              struct il_lq_sta *lq_sta)
1728 {
1729         struct ieee80211_hw *hw = il->hw;
1730         struct ieee80211_conf *conf = &hw->conf;
1731         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1732         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1733         int low = RATE_INVALID;
1734         int high = RATE_INVALID;
1735         int idx;
1736         int i;
1737         struct il_rate_scale_data *win = NULL;
1738         int current_tpt = IL_INVALID_VALUE;
1739         int low_tpt = IL_INVALID_VALUE;
1740         int high_tpt = IL_INVALID_VALUE;
1741         u32 fail_count;
1742         s8 scale_action = 0;
1743         u16 rate_mask;
1744         u8 update_lq = 0;
1745         struct il_scale_tbl_info *tbl, *tbl1;
1746         u16 rate_scale_idx_msk = 0;
1747         u8 is_green = 0;
1748         u8 active_tbl = 0;
1749         u8 done_search = 0;
1750         u16 high_low;
1751         s32 sr;
1752         u8 tid;
1753         struct il_tid_data *tid_data;
1754
1755         D_RATE("rate scale calculate new rate for skb\n");
1756
1757         /* Send management frames and NO_ACK data using lowest rate. */
1758         /* TODO: this could probably be improved.. */
1759         if (!ieee80211_is_data(hdr->frame_control) ||
1760             (info->flags & IEEE80211_TX_CTL_NO_ACK))
1761                 return;
1762
1763         lq_sta->supp_rates = sta->deflink.supp_rates[lq_sta->band];
1764
1765         tid = il4965_rs_tl_add_packet(lq_sta, hdr);
1766         if (tid != MAX_TID_COUNT && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1767                 tid_data = &il->stations[lq_sta->lq.sta_id].tid[tid];
1768                 if (tid_data->agg.state == IL_AGG_OFF)
1769                         lq_sta->is_agg = 0;
1770                 else
1771                         lq_sta->is_agg = 1;
1772         } else
1773                 lq_sta->is_agg = 0;
1774
1775         /*
1776          * Select rate-scale / modulation-mode table to work with in
1777          * the rest of this function:  "search" if searching for better
1778          * modulation mode, or "active" if doing rate scaling within a mode.
1779          */
1780         if (!lq_sta->search_better_tbl)
1781                 active_tbl = lq_sta->active_tbl;
1782         else
1783                 active_tbl = 1 - lq_sta->active_tbl;
1784
1785         tbl = &(lq_sta->lq_info[active_tbl]);
1786         if (is_legacy(tbl->lq_type))
1787                 lq_sta->is_green = 0;
1788         else
1789                 lq_sta->is_green = il4965_rs_use_green(il, sta);
1790         is_green = lq_sta->is_green;
1791
1792         /* current tx rate */
1793         idx = lq_sta->last_txrate_idx;
1794
1795         D_RATE("Rate scale idx %d for type %d\n", idx, tbl->lq_type);
1796
1797         /* rates available for this association, and for modulation mode */
1798         rate_mask = il4965_rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1799
1800         D_RATE("mask 0x%04X\n", rate_mask);
1801
1802         /* mask with station rate restriction */
1803         if (is_legacy(tbl->lq_type)) {
1804                 if (lq_sta->band == NL80211_BAND_5GHZ)
1805                         /* supp_rates has no CCK bits in A mode */
1806                         rate_scale_idx_msk =
1807                             (u16) (rate_mask &
1808                                    (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
1809                 else
1810                         rate_scale_idx_msk =
1811                             (u16) (rate_mask & lq_sta->supp_rates);
1812
1813         } else
1814                 rate_scale_idx_msk = rate_mask;
1815
1816         if (!rate_scale_idx_msk)
1817                 rate_scale_idx_msk = rate_mask;
1818
1819         if (!((1 << idx) & rate_scale_idx_msk)) {
1820                 IL_ERR("Current Rate is not valid\n");
1821                 if (lq_sta->search_better_tbl) {
1822                         /* revert to active table if search table is not valid */
1823                         tbl->lq_type = LQ_NONE;
1824                         lq_sta->search_better_tbl = 0;
1825                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1826                         /* get "active" rate info */
1827                         idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
1828                         il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx,
1829                                                       is_green);
1830                 }
1831                 return;
1832         }
1833
1834         /* Get expected throughput table and history win for current rate */
1835         if (!tbl->expected_tpt) {
1836                 IL_ERR("tbl->expected_tpt is NULL\n");
1837                 return;
1838         }
1839
1840         /* force user max rate if set by user */
1841         if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < idx) {
1842                 idx = lq_sta->max_rate_idx;
1843                 update_lq = 1;
1844                 win = &(tbl->win[idx]);
1845                 goto lq_update;
1846         }
1847
1848         win = &(tbl->win[idx]);
1849
1850         /*
1851          * If there is not enough history to calculate actual average
1852          * throughput, keep analyzing results of more tx frames, without
1853          * changing rate or mode (bypass most of the rest of this function).
1854          * Set up new rate table in uCode only if old rate is not supported
1855          * in current association (use new rate found above).
1856          */
1857         fail_count = win->counter - win->success_counter;
1858         if (fail_count < RATE_MIN_FAILURE_TH &&
1859             win->success_counter < RATE_MIN_SUCCESS_TH) {
1860                 D_RATE("LQ: still below TH. succ=%d total=%d " "for idx %d\n",
1861                        win->success_counter, win->counter, idx);
1862
1863                 /* Can't calculate this yet; not enough history */
1864                 win->average_tpt = IL_INVALID_VALUE;
1865
1866                 /* Should we stay with this modulation mode,
1867                  * or search for a new one? */
1868                 il4965_rs_stay_in_table(lq_sta, false);
1869
1870                 goto out;
1871         }
1872         /* Else we have enough samples; calculate estimate of
1873          * actual average throughput */
1874         if (win->average_tpt !=
1875             ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128)) {
1876                 IL_ERR("expected_tpt should have been calculated by now\n");
1877                 win->average_tpt =
1878                     ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128);
1879         }
1880
1881         /* If we are searching for better modulation mode, check success. */
1882         if (lq_sta->search_better_tbl) {
1883                 /* If good success, continue using the "search" mode;
1884                  * no need to send new link quality command, since we're
1885                  * continuing to use the setup that we've been trying. */
1886                 if (win->average_tpt > lq_sta->last_tpt) {
1887
1888                         D_RATE("LQ: SWITCHING TO NEW TBL "
1889                                "suc=%d cur-tpt=%d old-tpt=%d\n",
1890                                win->success_ratio, win->average_tpt,
1891                                lq_sta->last_tpt);
1892
1893                         if (!is_legacy(tbl->lq_type))
1894                                 lq_sta->enable_counter = 1;
1895
1896                         /* Swap tables; "search" becomes "active" */
1897                         lq_sta->active_tbl = active_tbl;
1898                         current_tpt = win->average_tpt;
1899
1900                         /* Else poor success; go back to mode in "active" table */
1901                 } else {
1902
1903                         D_RATE("LQ: GOING BACK TO THE OLD 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                         /* Nullify "search" table */
1909                         tbl->lq_type = LQ_NONE;
1910
1911                         /* Revert to "active" table */
1912                         active_tbl = lq_sta->active_tbl;
1913                         tbl = &(lq_sta->lq_info[active_tbl]);
1914
1915                         /* Revert to "active" rate and throughput info */
1916                         idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
1917                         current_tpt = lq_sta->last_tpt;
1918
1919                         /* Need to set up a new rate table in uCode */
1920                         update_lq = 1;
1921                 }
1922
1923                 /* Either way, we've made a decision; modulation mode
1924                  * search is done, allow rate adjustment next time. */
1925                 lq_sta->search_better_tbl = 0;
1926                 done_search = 1;        /* Don't switch modes below! */
1927                 goto lq_update;
1928         }
1929
1930         /* (Else) not in search of better modulation mode, try for better
1931          * starting rate, while staying in this mode. */
1932         high_low =
1933             il4965_rs_get_adjacent_rate(il, idx, rate_scale_idx_msk,
1934                                         tbl->lq_type);
1935         low = high_low & 0xff;
1936         high = (high_low >> 8) & 0xff;
1937
1938         /* If user set max rate, dont allow higher than user constrain */
1939         if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < high)
1940                 high = RATE_INVALID;
1941
1942         sr = win->success_ratio;
1943
1944         /* Collect measured throughputs for current and adjacent rates */
1945         current_tpt = win->average_tpt;
1946         if (low != RATE_INVALID)
1947                 low_tpt = tbl->win[low].average_tpt;
1948         if (high != RATE_INVALID)
1949                 high_tpt = tbl->win[high].average_tpt;
1950
1951         scale_action = 0;
1952
1953         /* Too many failures, decrease rate */
1954         if (sr <= RATE_DECREASE_TH || current_tpt == 0) {
1955                 D_RATE("decrease rate because of low success_ratio\n");
1956                 scale_action = -1;
1957
1958                 /* No throughput measured yet for adjacent rates; try increase. */
1959         } else if (low_tpt == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) {
1960
1961                 if (high != RATE_INVALID && sr >= RATE_INCREASE_TH)
1962                         scale_action = 1;
1963                 else if (low != RATE_INVALID)
1964                         scale_action = 0;
1965         }
1966
1967         /* Both adjacent throughputs are measured, but neither one has better
1968          * throughput; we're using the best rate, don't change it! */
1969         else if (low_tpt != IL_INVALID_VALUE && high_tpt != IL_INVALID_VALUE &&
1970                  low_tpt < current_tpt && high_tpt < current_tpt)
1971                 scale_action = 0;
1972
1973         /* At least one adjacent rate's throughput is measured,
1974          * and may have better performance. */
1975         else {
1976                 /* Higher adjacent rate's throughput is measured */
1977                 if (high_tpt != IL_INVALID_VALUE) {
1978                         /* Higher rate has better throughput */
1979                         if (high_tpt > current_tpt && sr >= RATE_INCREASE_TH)
1980                                 scale_action = 1;
1981                         else
1982                                 scale_action = 0;
1983
1984                         /* Lower adjacent rate's throughput is measured */
1985                 } else if (low_tpt != IL_INVALID_VALUE) {
1986                         /* Lower rate has better throughput */
1987                         if (low_tpt > current_tpt) {
1988                                 D_RATE("decrease rate because of low tpt\n");
1989                                 scale_action = -1;
1990                         } else if (sr >= RATE_INCREASE_TH) {
1991                                 scale_action = 1;
1992                         }
1993                 }
1994         }
1995
1996         /* Sanity check; asked for decrease, but success rate or throughput
1997          * has been good at old rate.  Don't change it. */
1998         if (scale_action == -1 && low != RATE_INVALID &&
1999             (sr > RATE_HIGH_TH || current_tpt > 100 * tbl->expected_tpt[low]))
2000                 scale_action = 0;
2001
2002         switch (scale_action) {
2003         case -1:
2004                 /* Decrease starting rate, update uCode's rate table */
2005                 if (low != RATE_INVALID) {
2006                         update_lq = 1;
2007                         idx = low;
2008                 }
2009
2010                 break;
2011         case 1:
2012                 /* Increase starting rate, update uCode's rate table */
2013                 if (high != RATE_INVALID) {
2014                         update_lq = 1;
2015                         idx = high;
2016                 }
2017
2018                 break;
2019         case 0:
2020                 /* No change */
2021         default:
2022                 break;
2023         }
2024
2025         D_RATE("choose rate scale idx %d action %d low %d " "high %d type %d\n",
2026                idx, scale_action, low, high, tbl->lq_type);
2027
2028 lq_update:
2029         /* Replace uCode's rate table for the destination station. */
2030         if (update_lq)
2031                 il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx, is_green);
2032
2033         /* Should we stay with this modulation mode,
2034          * or search for a new one? */
2035         il4965_rs_stay_in_table(lq_sta, false);
2036
2037         /*
2038          * Search for new modulation mode if we're:
2039          * 1)  Not changing rates right now
2040          * 2)  Not just finishing up a search
2041          * 3)  Allowing a new search
2042          */
2043         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && win->counter) {
2044                 /* Save current throughput to compare with "search" throughput */
2045                 lq_sta->last_tpt = current_tpt;
2046
2047                 /* Select a new "search" modulation mode to try.
2048                  * If one is found, set up the new "search" table. */
2049                 if (is_legacy(tbl->lq_type))
2050                         il4965_rs_move_legacy_other(il, lq_sta, conf, sta, idx);
2051                 else if (is_siso(tbl->lq_type))
2052                         il4965_rs_move_siso_to_other(il, lq_sta, conf, sta,
2053                                                      idx);
2054                 else            /* (is_mimo2(tbl->lq_type)) */
2055                         il4965_rs_move_mimo2_to_other(il, lq_sta, conf, sta,
2056                                                       idx);
2057
2058                 /* If new "search" mode was selected, set up in uCode table */
2059                 if (lq_sta->search_better_tbl) {
2060                         /* Access the "search" table, clear its history. */
2061                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2062                         for (i = 0; i < RATE_COUNT; i++)
2063                                 il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
2064
2065                         /* Use new "search" start rate */
2066                         idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
2067
2068                         D_RATE("Switch current  mcs: %X idx: %d\n",
2069                                tbl->current_rate, idx);
2070                         il4965_rs_fill_link_cmd(il, lq_sta, tbl->current_rate);
2071                         il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
2072                 } else
2073                         done_search = 1;
2074         }
2075
2076         if (done_search && !lq_sta->stay_in_tbl) {
2077                 /* If the "active" (non-search) mode was legacy,
2078                  * and we've tried switching antennas,
2079                  * but we haven't been able to try HT modes (not available),
2080                  * stay with best antenna legacy modulation for a while
2081                  * before next round of mode comparisons. */
2082                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2083                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2084                     lq_sta->action_counter > tbl1->max_search) {
2085                         D_RATE("LQ: STAY in legacy table\n");
2086                         il4965_rs_set_stay_in_table(il, 1, lq_sta);
2087                 }
2088
2089                 /* If we're in an HT mode, and all 3 mode switch actions
2090                  * have been tried and compared, stay in this best modulation
2091                  * mode for a while before next round of mode comparisons. */
2092                 if (lq_sta->enable_counter &&
2093                     lq_sta->action_counter >= tbl1->max_search) {
2094                         if (lq_sta->last_tpt > IL_AGG_TPT_THREHOLD &&
2095                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2096                             tid != MAX_TID_COUNT) {
2097                                 tid_data =
2098                                     &il->stations[lq_sta->lq.sta_id].tid[tid];
2099                                 if (tid_data->agg.state == IL_AGG_OFF) {
2100                                         D_RATE("try to aggregate tid %d\n",
2101                                                tid);
2102                                         il4965_rs_tl_turn_on_agg(il, tid,
2103                                                                  lq_sta, sta);
2104                                 }
2105                         }
2106                         il4965_rs_set_stay_in_table(il, 0, lq_sta);
2107                 }
2108         }
2109
2110 out:
2111         tbl->current_rate =
2112             il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
2113         i = idx;
2114         lq_sta->last_txrate_idx = i;
2115 }
2116
2117 /*
2118  * il4965_rs_initialize_lq - Initialize a station's hardware rate table
2119  *
2120  * The uCode's station table contains a table of fallback rates
2121  * for automatic fallback during transmission.
2122  *
2123  * NOTE: This sets up a default set of values.  These will be replaced later
2124  *       if the driver's iwl-4965-rs rate scaling algorithm is used, instead of
2125  *       rc80211_simple.
2126  *
2127  * NOTE: Run C_ADD_STA command to set up station table entry, before
2128  *       calling this function (which runs C_TX_LINK_QUALITY_CMD,
2129  *       which requires station table entry to exist).
2130  */
2131 static void
2132 il4965_rs_initialize_lq(struct il_priv *il, struct ieee80211_conf *conf,
2133                         struct ieee80211_sta *sta, struct il_lq_sta *lq_sta)
2134 {
2135         struct il_scale_tbl_info *tbl;
2136         int rate_idx;
2137         int i;
2138         u32 rate;
2139         u8 use_green;
2140         u8 active_tbl = 0;
2141         u8 valid_tx_ant;
2142
2143         if (!sta || !lq_sta)
2144                 return;
2145
2146         use_green = il4965_rs_use_green(il, sta);
2147
2148         i = lq_sta->last_txrate_idx;
2149
2150         valid_tx_ant = il->hw_params.valid_tx_ant;
2151
2152         if (!lq_sta->search_better_tbl)
2153                 active_tbl = lq_sta->active_tbl;
2154         else
2155                 active_tbl = 1 - lq_sta->active_tbl;
2156
2157         tbl = &(lq_sta->lq_info[active_tbl]);
2158
2159         if (i < 0 || i >= RATE_COUNT)
2160                 i = 0;
2161
2162         rate = il_rates[i].plcp;
2163         tbl->ant_type = il4965_first_antenna(valid_tx_ant);
2164         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2165
2166         if (i >= IL_FIRST_CCK_RATE && i <= IL_LAST_CCK_RATE)
2167                 rate |= RATE_MCS_CCK_MSK;
2168
2169         il4965_rs_get_tbl_info_from_mcs(rate, il->band, tbl, &rate_idx);
2170         if (!il4965_rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2171                 il4965_rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2172
2173         rate = il4965_rate_n_flags_from_tbl(il, tbl, rate_idx, use_green);
2174         tbl->current_rate = rate;
2175         il4965_rs_set_expected_tpt_table(lq_sta, tbl);
2176         il4965_rs_fill_link_cmd(NULL, lq_sta, rate);
2177         il->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2178         il_send_lq_cmd(il, &lq_sta->lq, CMD_SYNC, true);
2179 }
2180
2181 static void
2182 il4965_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta,
2183                    struct ieee80211_tx_rate_control *txrc)
2184 {
2185
2186         struct sk_buff *skb = txrc->skb;
2187         struct ieee80211_supported_band *sband = txrc->sband;
2188         struct il_priv *il __maybe_unused = (struct il_priv *)il_r;
2189         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2190         struct il_lq_sta *lq_sta = il_sta;
2191         int rate_idx;
2192
2193         D_RATE("rate scale calculate new rate for skb\n");
2194
2195         /* Get max rate if user set max rate */
2196         if (lq_sta) {
2197                 lq_sta->max_rate_idx = fls(txrc->rate_idx_mask) - 1;
2198                 if (sband->band == NL80211_BAND_5GHZ &&
2199                     lq_sta->max_rate_idx != -1)
2200                         lq_sta->max_rate_idx += IL_FIRST_OFDM_RATE;
2201                 if (lq_sta->max_rate_idx < 0 ||
2202                     lq_sta->max_rate_idx >= RATE_COUNT)
2203                         lq_sta->max_rate_idx = -1;
2204         }
2205
2206         /* Treat uninitialized rate scaling data same as non-existing. */
2207         if (lq_sta && !lq_sta->drv) {
2208                 D_RATE("Rate scaling not initialized yet.\n");
2209                 il_sta = NULL;
2210         }
2211
2212         if (!lq_sta)
2213                 return;
2214
2215         rate_idx = lq_sta->last_txrate_idx;
2216
2217         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2218                 rate_idx -= IL_FIRST_OFDM_RATE;
2219                 /* 6M and 9M shared same MCS idx */
2220                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2221                 if (il4965_rs_extract_rate(lq_sta->last_rate_n_flags) >=
2222                     RATE_MIMO2_6M_PLCP)
2223                         rate_idx = rate_idx + MCS_IDX_PER_STREAM;
2224                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2225                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2226                         info->control.rates[0].flags |=
2227                             IEEE80211_TX_RC_SHORT_GI;
2228                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2229                         info->control.rates[0].flags |=
2230                             IEEE80211_TX_RC_DUP_DATA;
2231                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2232                         info->control.rates[0].flags |=
2233                             IEEE80211_TX_RC_40_MHZ_WIDTH;
2234                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2235                         info->control.rates[0].flags |=
2236                             IEEE80211_TX_RC_GREEN_FIELD;
2237         } else {
2238                 /* Check for invalid rates */
2239                 if (rate_idx < 0 || rate_idx >= RATE_COUNT_LEGACY ||
2240                     (sband->band == NL80211_BAND_5GHZ &&
2241                      rate_idx < IL_FIRST_OFDM_RATE))
2242                         rate_idx = rate_lowest_index(sband, sta);
2243                 /* On valid 5 GHz rate, adjust idx */
2244                 else if (sband->band == NL80211_BAND_5GHZ)
2245                         rate_idx -= IL_FIRST_OFDM_RATE;
2246                 info->control.rates[0].flags = 0;
2247         }
2248         info->control.rates[0].idx = rate_idx;
2249         info->control.rates[0].count = 1;
2250 }
2251
2252 static void *
2253 il4965_rs_alloc_sta(void *il_rate, struct ieee80211_sta *sta, gfp_t gfp)
2254 {
2255         struct il_station_priv *sta_priv =
2256             (struct il_station_priv *)sta->drv_priv;
2257         struct il_priv *il;
2258
2259         il = (struct il_priv *)il_rate;
2260         D_RATE("create station rate scale win\n");
2261
2262         return &sta_priv->lq_sta;
2263 }
2264
2265 /*
2266  * Called after adding a new station to initialize rate scaling
2267  */
2268 void
2269 il4965_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id)
2270 {
2271         int i, j;
2272         struct ieee80211_hw *hw = il->hw;
2273         struct ieee80211_conf *conf = &il->hw->conf;
2274         struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
2275         struct il_station_priv *sta_priv;
2276         struct il_lq_sta *lq_sta;
2277         struct ieee80211_supported_band *sband;
2278
2279         sta_priv = (struct il_station_priv *)sta->drv_priv;
2280         lq_sta = &sta_priv->lq_sta;
2281         sband = hw->wiphy->bands[conf->chandef.chan->band];
2282
2283         lq_sta->lq.sta_id = sta_id;
2284
2285         for (j = 0; j < LQ_SIZE; j++)
2286                 for (i = 0; i < RATE_COUNT; i++)
2287                         il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
2288                                                        win[i]);
2289
2290         lq_sta->flush_timer = 0;
2291         lq_sta->supp_rates = sta->deflink.supp_rates[sband->band];
2292         for (j = 0; j < LQ_SIZE; j++)
2293                 for (i = 0; i < RATE_COUNT; i++)
2294                         il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
2295                                                        win[i]);
2296
2297         D_RATE("LQ:" "*** rate scale station global init for station %d ***\n",
2298                sta_id);
2299         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2300          * the lowest or the highest rate.. Could consider using RSSI from
2301          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2302          * after assoc.. */
2303
2304         lq_sta->is_dup = 0;
2305         lq_sta->max_rate_idx = -1;
2306         lq_sta->missed_rate_counter = IL_MISSED_RATE_MAX;
2307         lq_sta->is_green = il4965_rs_use_green(il, sta);
2308         lq_sta->active_legacy_rate = il->active_rate & ~(0x1000);
2309         lq_sta->band = il->band;
2310         /*
2311          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2312          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2313          */
2314         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2315         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2316         lq_sta->active_siso_rate &= ~((u16) 0x2);
2317         lq_sta->active_siso_rate <<= IL_FIRST_OFDM_RATE;
2318
2319         /* Same here */
2320         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2321         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2322         lq_sta->active_mimo2_rate &= ~((u16) 0x2);
2323         lq_sta->active_mimo2_rate <<= IL_FIRST_OFDM_RATE;
2324
2325         /* These values will be overridden later */
2326         lq_sta->lq.general_params.single_stream_ant_msk =
2327             il4965_first_antenna(il->hw_params.valid_tx_ant);
2328         lq_sta->lq.general_params.dual_stream_ant_msk =
2329             il->hw_params.valid_tx_ant & ~il4965_first_antenna(il->hw_params.
2330                                                                valid_tx_ant);
2331         if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2332                 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2333         } else if (il4965_num_of_ant(il->hw_params.valid_tx_ant) == 2) {
2334                 lq_sta->lq.general_params.dual_stream_ant_msk =
2335                     il->hw_params.valid_tx_ant;
2336         }
2337
2338         /* as default allow aggregation for all tids */
2339         lq_sta->tx_agg_tid_en = IL_AGG_ALL_TID;
2340         lq_sta->drv = il;
2341
2342         /* Set last_txrate_idx to lowest rate */
2343         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2344         if (sband->band == NL80211_BAND_5GHZ)
2345                 lq_sta->last_txrate_idx += IL_FIRST_OFDM_RATE;
2346         lq_sta->is_agg = 0;
2347
2348 #ifdef CONFIG_MAC80211_DEBUGFS
2349         lq_sta->dbg_fixed_rate = 0;
2350 #endif
2351
2352         il4965_rs_initialize_lq(il, conf, sta, lq_sta);
2353 }
2354
2355 static void
2356 il4965_rs_fill_link_cmd(struct il_priv *il, struct il_lq_sta *lq_sta,
2357                         u32 new_rate)
2358 {
2359         struct il_scale_tbl_info tbl_type;
2360         int idx = 0;
2361         int rate_idx;
2362         int repeat_rate = 0;
2363         u8 ant_toggle_cnt = 0;
2364         u8 use_ht_possible = 1;
2365         u8 valid_tx_ant = 0;
2366         struct il_link_quality_cmd *lq_cmd = &lq_sta->lq;
2367
2368         /* Override starting rate (idx 0) if needed for debug purposes */
2369         il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2370
2371         /* Interpret new_rate (rate_n_flags) */
2372         il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2373                                         &rate_idx);
2374
2375         /* How many times should we repeat the initial rate? */
2376         if (is_legacy(tbl_type.lq_type)) {
2377                 ant_toggle_cnt = 1;
2378                 repeat_rate = IL_NUMBER_TRY;
2379         } else {
2380                 repeat_rate = IL_HT_NUMBER_TRY;
2381         }
2382
2383         lq_cmd->general_params.mimo_delimiter =
2384             is_mimo(tbl_type.lq_type) ? 1 : 0;
2385
2386         /* Fill 1st table entry (idx 0) */
2387         lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
2388
2389         if (il4965_num_of_ant(tbl_type.ant_type) == 1) {
2390                 lq_cmd->general_params.single_stream_ant_msk =
2391                     tbl_type.ant_type;
2392         } else if (il4965_num_of_ant(tbl_type.ant_type) == 2) {
2393                 lq_cmd->general_params.dual_stream_ant_msk = tbl_type.ant_type;
2394         }
2395         /* otherwise we don't modify the existing value */
2396         idx++;
2397         repeat_rate--;
2398         if (il)
2399                 valid_tx_ant = il->hw_params.valid_tx_ant;
2400
2401         /* Fill rest of rate table */
2402         while (idx < LINK_QUAL_MAX_RETRY_NUM) {
2403                 /* Repeat initial/next rate.
2404                  * For legacy IL_NUMBER_TRY == 1, this loop will not execute.
2405                  * For HT IL_HT_NUMBER_TRY == 3, this executes twice. */
2406                 while (repeat_rate > 0) {
2407                         if (is_legacy(tbl_type.lq_type)) {
2408                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2409                                         ant_toggle_cnt++;
2410                                 else if (il &&
2411                                          il4965_rs_toggle_antenna(valid_tx_ant,
2412                                                                   &new_rate,
2413                                                                   &tbl_type))
2414                                         ant_toggle_cnt = 1;
2415                         }
2416
2417                         /* Override next rate if needed for debug purposes */
2418                         il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2419
2420                         /* Fill next table entry */
2421                         lq_cmd->rs_table[idx].rate_n_flags =
2422                             cpu_to_le32(new_rate);
2423                         repeat_rate--;
2424                         idx++;
2425                         if (idx >= LINK_QUAL_MAX_RETRY_NUM)
2426                                 goto out;
2427                 }
2428
2429                 il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2430                                                 &tbl_type, &rate_idx);
2431
2432                 /* Indicate to uCode which entries might be MIMO.
2433                  * If initial rate was MIMO, this will finally end up
2434                  * as (IL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2435                 if (is_mimo(tbl_type.lq_type))
2436                         lq_cmd->general_params.mimo_delimiter = idx;
2437
2438                 /* Get next rate */
2439                 new_rate =
2440                     il4965_rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2441                                              use_ht_possible);
2442
2443                 /* How many times should we repeat the next rate? */
2444                 if (is_legacy(tbl_type.lq_type)) {
2445                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2446                                 ant_toggle_cnt++;
2447                         else if (il &&
2448                                  il4965_rs_toggle_antenna(valid_tx_ant,
2449                                                           &new_rate, &tbl_type))
2450                                 ant_toggle_cnt = 1;
2451
2452                         repeat_rate = IL_NUMBER_TRY;
2453                 } else {
2454                         repeat_rate = IL_HT_NUMBER_TRY;
2455                 }
2456
2457                 /* Don't allow HT rates after next pass.
2458                  * il4965_rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2459                 use_ht_possible = 0;
2460
2461                 /* Override next rate if needed for debug purposes */
2462                 il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2463
2464                 /* Fill next table entry */
2465                 lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
2466
2467                 idx++;
2468                 repeat_rate--;
2469         }
2470
2471 out:
2472         lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2473         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2474
2475         lq_cmd->agg_params.agg_time_limit =
2476             cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2477 }
2478
2479 static void *
2480 il4965_rs_alloc(struct ieee80211_hw *hw)
2481 {
2482         return hw->priv;
2483 }
2484
2485 /* rate scale requires free function to be implemented */
2486 static void
2487 il4965_rs_free(void *il_rate)
2488 {
2489         return;
2490 }
2491
2492 static void
2493 il4965_rs_free_sta(void *il_r, struct ieee80211_sta *sta, void *il_sta)
2494 {
2495         struct il_priv *il __maybe_unused = il_r;
2496
2497         D_RATE("enter\n");
2498         D_RATE("leave\n");
2499 }
2500
2501 #ifdef CONFIG_MAC80211_DEBUGFS
2502
2503 static void
2504 il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
2505 {
2506         struct il_priv *il;
2507         u8 valid_tx_ant;
2508         u8 ant_sel_tx;
2509
2510         il = lq_sta->drv;
2511         valid_tx_ant = il->hw_params.valid_tx_ant;
2512         if (lq_sta->dbg_fixed_rate) {
2513                 ant_sel_tx =
2514                     ((lq_sta->
2515                       dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) >>
2516                      RATE_MCS_ANT_POS);
2517                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2518                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2519                         D_RATE("Fixed rate ON\n");
2520                 } else {
2521                         lq_sta->dbg_fixed_rate = 0;
2522                         IL_ERR
2523                             ("Invalid antenna selection 0x%X, Valid is 0x%X\n",
2524                              ant_sel_tx, valid_tx_ant);
2525                         D_RATE("Fixed rate OFF\n");
2526                 }
2527         } else {
2528                 D_RATE("Fixed rate OFF\n");
2529         }
2530 }
2531
2532 static ssize_t
2533 il4965_rs_sta_dbgfs_scale_table_write(struct file *file,
2534                                       const char __user *user_buf,
2535                                       size_t count, loff_t *ppos)
2536 {
2537         struct il_lq_sta *lq_sta = file->private_data;
2538         struct il_priv *il;
2539         char buf[64];
2540         size_t buf_size;
2541         u32 parsed_rate;
2542
2543         il = lq_sta->drv;
2544         memset(buf, 0, sizeof(buf));
2545         buf_size = min(count, sizeof(buf) - 1);
2546         if (copy_from_user(buf, user_buf, buf_size))
2547                 return -EFAULT;
2548
2549         if (sscanf(buf, "%x", &parsed_rate) == 1)
2550                 lq_sta->dbg_fixed_rate = parsed_rate;
2551         else
2552                 lq_sta->dbg_fixed_rate = 0;
2553
2554         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2555         lq_sta->active_siso_rate = 0x1FD0;      /* 6 - 60 MBits, no 9, no CCK */
2556         lq_sta->active_mimo2_rate = 0x1FD0;     /* 6 - 60 MBits, no 9, no CCK */
2557
2558         D_RATE("sta_id %d rate 0x%X\n", lq_sta->lq.sta_id,
2559                lq_sta->dbg_fixed_rate);
2560
2561         if (lq_sta->dbg_fixed_rate) {
2562                 il4965_rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2563                 il_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
2564         }
2565
2566         return count;
2567 }
2568
2569 static ssize_t
2570 il4965_rs_sta_dbgfs_scale_table_read(struct file *file, char __user *user_buf,
2571                                      size_t count, loff_t *ppos)
2572 {
2573         char *buff;
2574         int desc = 0;
2575         int i = 0;
2576         int idx = 0;
2577         ssize_t ret;
2578
2579         struct il_lq_sta *lq_sta = file->private_data;
2580         struct il_priv *il;
2581         struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2582
2583         il = lq_sta->drv;
2584         buff = kmalloc(1024, GFP_KERNEL);
2585         if (!buff)
2586                 return -ENOMEM;
2587
2588         desc += sprintf(buff + desc, "sta_id %d\n", lq_sta->lq.sta_id);
2589         desc +=
2590             sprintf(buff + desc, "failed=%d success=%d rate=0%X\n",
2591                     lq_sta->total_failed, lq_sta->total_success,
2592                     lq_sta->active_legacy_rate);
2593         desc +=
2594             sprintf(buff + desc, "fixed rate 0x%X\n", lq_sta->dbg_fixed_rate);
2595         desc +=
2596             sprintf(buff + desc, "valid_tx_ant %s%s%s\n",
2597                     (il->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2598                     (il->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2599                     (il->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2600         desc +=
2601             sprintf(buff + desc, "lq type %s\n",
2602                     (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2603         if (is_Ht(tbl->lq_type)) {
2604                 desc +=
2605                     sprintf(buff + desc, " %s",
2606                             (is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");
2607                 desc +=
2608                     sprintf(buff + desc, " %s",
2609                             (tbl->is_ht40) ? "40MHz" : "20MHz");
2610                 desc +=
2611                     sprintf(buff + desc, " %s %s %s\n",
2612                             (tbl->is_SGI) ? "SGI" : "",
2613                             (lq_sta->is_green) ? "GF enabled" : "",
2614                             (lq_sta->is_agg) ? "AGG on" : "");
2615         }
2616         desc +=
2617             sprintf(buff + desc, "last tx rate=0x%X\n",
2618                     lq_sta->last_rate_n_flags);
2619         desc +=
2620             sprintf(buff + desc,
2621                     "general:" "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2622                     lq_sta->lq.general_params.flags,
2623                     lq_sta->lq.general_params.mimo_delimiter,
2624                     lq_sta->lq.general_params.single_stream_ant_msk,
2625                     lq_sta->lq.general_params.dual_stream_ant_msk);
2626
2627         desc +=
2628             sprintf(buff + desc,
2629                     "agg:"
2630                     "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2631                     le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2632                     lq_sta->lq.agg_params.agg_dis_start_th,
2633                     lq_sta->lq.agg_params.agg_frame_cnt_limit);
2634
2635         desc +=
2636             sprintf(buff + desc,
2637                     "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2638                     lq_sta->lq.general_params.start_rate_idx[0],
2639                     lq_sta->lq.general_params.start_rate_idx[1],
2640                     lq_sta->lq.general_params.start_rate_idx[2],
2641                     lq_sta->lq.general_params.start_rate_idx[3]);
2642
2643         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2644                 idx =
2645                     il4965_hwrate_to_plcp_idx(le32_to_cpu
2646                                               (lq_sta->lq.rs_table[i].
2647                                                rate_n_flags));
2648                 if (is_legacy(tbl->lq_type)) {
2649                         desc +=
2650                             sprintf(buff + desc, " rate[%d] 0x%X %smbps\n", i,
2651                                     le32_to_cpu(lq_sta->lq.rs_table[i].
2652                                                 rate_n_flags),
2653                                     il_rate_mcs[idx].mbps);
2654                 } else {
2655                         desc +=
2656                             sprintf(buff + desc, " rate[%d] 0x%X %smbps (%s)\n",
2657                                     i,
2658                                     le32_to_cpu(lq_sta->lq.rs_table[i].
2659                                                 rate_n_flags),
2660                                     il_rate_mcs[idx].mbps,
2661                                     il_rate_mcs[idx].mcs);
2662                 }
2663         }
2664
2665         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2666         kfree(buff);
2667         return ret;
2668 }
2669
2670 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2671         .write = il4965_rs_sta_dbgfs_scale_table_write,
2672         .read = il4965_rs_sta_dbgfs_scale_table_read,
2673         .open = simple_open,
2674         .llseek = default_llseek,
2675 };
2676
2677 static ssize_t
2678 il4965_rs_sta_dbgfs_stats_table_read(struct file *file, char __user *user_buf,
2679                                      size_t count, loff_t *ppos)
2680 {
2681         char *buff;
2682         int desc = 0;
2683         int i, j;
2684         ssize_t ret;
2685
2686         struct il_lq_sta *lq_sta = file->private_data;
2687
2688         buff = kmalloc(1024, GFP_KERNEL);
2689         if (!buff)
2690                 return -ENOMEM;
2691
2692         for (i = 0; i < LQ_SIZE; i++) {
2693                 desc +=
2694                     sprintf(buff + desc,
2695                             "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2696                             "rate=0x%X\n", lq_sta->active_tbl == i ? "*" : "x",
2697                             lq_sta->lq_info[i].lq_type,
2698                             lq_sta->lq_info[i].is_SGI,
2699                             lq_sta->lq_info[i].is_ht40,
2700                             lq_sta->lq_info[i].is_dup, lq_sta->is_green,
2701                             lq_sta->lq_info[i].current_rate);
2702                 for (j = 0; j < RATE_COUNT; j++) {
2703                         desc +=
2704                             sprintf(buff + desc,
2705                                     "counter=%d success=%d %%=%d\n",
2706                                     lq_sta->lq_info[i].win[j].counter,
2707                                     lq_sta->lq_info[i].win[j].success_counter,
2708                                     lq_sta->lq_info[i].win[j].success_ratio);
2709                 }
2710         }
2711         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2712         kfree(buff);
2713         return ret;
2714 }
2715
2716 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2717         .read = il4965_rs_sta_dbgfs_stats_table_read,
2718         .open = simple_open,
2719         .llseek = default_llseek,
2720 };
2721
2722 static ssize_t
2723 il4965_rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2724                                          char __user *user_buf, size_t count,
2725                                          loff_t *ppos)
2726 {
2727         char buff[120];
2728         int desc = 0;
2729         struct il_lq_sta *lq_sta = file->private_data;
2730         struct il_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2731
2732         if (is_Ht(tbl->lq_type))
2733                 desc +=
2734                     sprintf(buff + desc, "Bit Rate= %d Mb/s\n",
2735                             tbl->expected_tpt[lq_sta->last_txrate_idx]);
2736         else
2737                 desc +=
2738                     sprintf(buff + desc, "Bit Rate= %d Mb/s\n",
2739                             il_rates[lq_sta->last_txrate_idx].ieee >> 1);
2740
2741         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2742 }
2743
2744 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2745         .read = il4965_rs_sta_dbgfs_rate_scale_data_read,
2746         .open = simple_open,
2747         .llseek = default_llseek,
2748 };
2749
2750 static void
2751 il4965_rs_add_debugfs(void *il, void *il_sta, struct dentry *dir)
2752 {
2753         struct il_lq_sta *lq_sta = il_sta;
2754
2755         debugfs_create_file("rate_scale_table", 0600, dir, lq_sta,
2756                             &rs_sta_dbgfs_scale_table_ops);
2757         debugfs_create_file("rate_stats_table", 0400, dir, lq_sta,
2758                             &rs_sta_dbgfs_stats_table_ops);
2759         debugfs_create_file("rate_scale_data", 0400, dir, lq_sta,
2760                             &rs_sta_dbgfs_rate_scale_data_ops);
2761         debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2762                           &lq_sta->tx_agg_tid_en);
2763 }
2764 #endif
2765
2766 /*
2767  * Initialization of rate scaling information is done by driver after
2768  * the station is added. Since mac80211 calls this function before a
2769  * station is added we ignore it.
2770  */
2771 static void
2772 il4965_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband,
2773                          struct cfg80211_chan_def *chandef,
2774                          struct ieee80211_sta *sta, void *il_sta)
2775 {
2776 }
2777
2778 static const struct rate_control_ops rs_4965_ops = {
2779         .name = IL4965_RS_NAME,
2780         .tx_status = il4965_rs_tx_status,
2781         .get_rate = il4965_rs_get_rate,
2782         .rate_init = il4965_rs_rate_init_stub,
2783         .alloc = il4965_rs_alloc,
2784         .free = il4965_rs_free,
2785         .alloc_sta = il4965_rs_alloc_sta,
2786         .free_sta = il4965_rs_free_sta,
2787 #ifdef CONFIG_MAC80211_DEBUGFS
2788         .add_sta_debugfs = il4965_rs_add_debugfs,
2789 #endif
2790 };
2791
2792 int
2793 il4965_rate_control_register(void)
2794 {
2795         return ieee80211_rate_control_register(&rs_4965_ops);
2796 }
2797
2798 void
2799 il4965_rate_control_unregister(void)
2800 {
2801         ieee80211_rate_control_unregister(&rs_4965_ops);
2802 }