linux/drivers/net/wireless/intel/iwlegacy/4965-rs.c
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   1/******************************************************************************
   2 *
   3 * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
   4 *
   5 * This program is free software; you can redistribute it and/or modify it
   6 * under the terms of version 2 of the GNU General Public License as
   7 * published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it will be useful, but WITHOUT
  10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12 * more details.
  13 *
  14 * You should have received a copy of the GNU General Public License along with
  15 * this program; if not, write to the Free Software Foundation, Inc.,
  16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17 *
  18 * The full GNU General Public License is included in this distribution in the
  19 * file called LICENSE.
  20 *
  21 * Contact Information:
  22 *  Intel Linux Wireless <ilw@linux.intel.com>
  23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24 *
  25 *****************************************************************************/
  26#include <linux/kernel.h>
  27#include <linux/skbuff.h>
  28#include <linux/slab.h>
  29#include <net/mac80211.h>
  30
  31#include <linux/netdevice.h>
  32#include <linux/etherdevice.h>
  33#include <linux/delay.h>
  34
  35#include <linux/workqueue.h>
  36
  37#include "common.h"
  38#include "4965.h"
  39
  40#define IL4965_RS_NAME "iwl-4965-rs"
  41
  42#define NUM_TRY_BEFORE_ANT_TOGGLE 1
  43#define IL_NUMBER_TRY      1
  44#define IL_HT_NUMBER_TRY   3
  45
  46#define RATE_MAX_WINDOW         62      /* # tx in history win */
  47#define RATE_MIN_FAILURE_TH             6       /* min failures to calc tpt */
  48#define RATE_MIN_SUCCESS_TH             8       /* min successes to calc tpt */
  49
  50/* max allowed rate miss before sync LQ cmd */
  51#define IL_MISSED_RATE_MAX              15
  52/* max time to accum history 2 seconds */
  53#define RATE_SCALE_FLUSH_INTVL   (3*HZ)
  54
  55static u8 rs_ht_to_legacy[] = {
  56        RATE_6M_IDX, RATE_6M_IDX,
  57        RATE_6M_IDX, RATE_6M_IDX,
  58        RATE_6M_IDX,
  59        RATE_6M_IDX, RATE_9M_IDX,
  60        RATE_12M_IDX, RATE_18M_IDX,
  61        RATE_24M_IDX, RATE_36M_IDX,
  62        RATE_48M_IDX, RATE_54M_IDX
  63};
  64
  65static const u8 ant_toggle_lookup[] = {
  66        /*ANT_NONE -> */ ANT_NONE,
  67        /*ANT_A    -> */ ANT_B,
  68        /*ANT_B    -> */ ANT_C,
  69        /*ANT_AB   -> */ ANT_BC,
  70        /*ANT_C    -> */ ANT_A,
  71        /*ANT_AC   -> */ ANT_AB,
  72        /*ANT_BC   -> */ ANT_AC,
  73        /*ANT_ABC  -> */ ANT_ABC,
  74};
  75
  76#define IL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
  77        [RATE_##r##M_IDX] = { RATE_##r##M_PLCP,      \
  78                                    RATE_SISO_##s##M_PLCP, \
  79                                    RATE_MIMO2_##s##M_PLCP,\
  80                                    RATE_##r##M_IEEE,      \
  81                                    RATE_##ip##M_IDX,    \
  82                                    RATE_##in##M_IDX,    \
  83                                    RATE_##rp##M_IDX,    \
  84                                    RATE_##rn##M_IDX,    \
  85                                    RATE_##pp##M_IDX,    \
  86                                    RATE_##np##M_IDX }
  87
  88/*
  89 * Parameter order:
  90 *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
  91 *
  92 * If there isn't a valid next or previous rate then INV is used which
  93 * maps to RATE_INVALID
  94 *
  95 */
  96const struct il_rate_info il_rates[RATE_COUNT] = {
  97        IL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),   /*  1mbps */
  98        IL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),         /*  2mbps */
  99        IL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),       /*5.5mbps */
 100        IL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),     /* 11mbps */
 101        IL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),         /*  6mbps */
 102        IL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),        /*  9mbps */
 103        IL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
 104        IL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
 105        IL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
 106        IL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
 107        IL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
 108        IL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
 109        IL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
 110};
 111
 112static int
 113il4965_hwrate_to_plcp_idx(u32 rate_n_flags)
 114{
 115        int idx = 0;
 116
 117        /* HT rate format */
 118        if (rate_n_flags & RATE_MCS_HT_MSK) {
 119                idx = (rate_n_flags & 0xff);
 120
 121                if (idx >= RATE_MIMO2_6M_PLCP)
 122                        idx = idx - RATE_MIMO2_6M_PLCP;
 123
 124                idx += IL_FIRST_OFDM_RATE;
 125                /* skip 9M not supported in ht */
 126                if (idx >= RATE_9M_IDX)
 127                        idx += 1;
 128                if (idx >= IL_FIRST_OFDM_RATE && idx <= IL_LAST_OFDM_RATE)
 129                        return idx;
 130
 131                /* legacy rate format, search for match in table */
 132        } else {
 133                for (idx = 0; idx < ARRAY_SIZE(il_rates); idx++)
 134                        if (il_rates[idx].plcp == (rate_n_flags & 0xFF))
 135                                return idx;
 136        }
 137
 138        return -1;
 139}
 140
 141static void il4965_rs_rate_scale_perform(struct il_priv *il,
 142                                         struct sk_buff *skb,
 143                                         struct ieee80211_sta *sta,
 144                                         struct il_lq_sta *lq_sta);
 145static void il4965_rs_fill_link_cmd(struct il_priv *il,
 146                                    struct il_lq_sta *lq_sta, u32 rate_n_flags);
 147static void il4965_rs_stay_in_table(struct il_lq_sta *lq_sta,
 148                                    bool force_search);
 149
 150#ifdef CONFIG_MAC80211_DEBUGFS
 151static void il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta,
 152                                    u32 *rate_n_flags, int idx);
 153#else
 154static void
 155il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
 156{
 157}
 158#endif
 159
 160/**
 161 * The following tables contain the expected throughput metrics for all rates
 162 *
 163 *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 164 *
 165 * where invalid entries are zeros.
 166 *
 167 * CCK rates are only valid in legacy table and will only be used in G
 168 * (2.4 GHz) band.
 169 */
 170
 171static s32 expected_tpt_legacy[RATE_COUNT] = {
 172        7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 173};
 174
 175static s32 expected_tpt_siso20MHz[4][RATE_COUNT] = {
 176        {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202},  /* Norm */
 177        {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210},  /* SGI */
 178        {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381},  /* AGG */
 179        {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
 180};
 181
 182static s32 expected_tpt_siso40MHz[4][RATE_COUNT] = {
 183        {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 184        {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 185        {0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
 186        {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683},        /* AGG+SGI */
 187};
 188
 189static s32 expected_tpt_mimo2_20MHz[4][RATE_COUNT] = {
 190        {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
 191        {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
 192        {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
 193        {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660},        /* AGG+SGI */
 194};
 195
 196static s32 expected_tpt_mimo2_40MHz[4][RATE_COUNT] = {
 197        {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289},        /* Norm */
 198        {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293},        /* SGI */
 199        {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922},        /* AGG */
 200        {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966},        /* AGG+SGI */
 201};
 202
 203/* mbps, mcs */
 204static const struct il_rate_mcs_info il_rate_mcs[RATE_COUNT] = {
 205        {"1", "BPSK DSSS"},
 206        {"2", "QPSK DSSS"},
 207        {"5.5", "BPSK CCK"},
 208        {"11", "QPSK CCK"},
 209        {"6", "BPSK 1/2"},
 210        {"9", "BPSK 1/2"},
 211        {"12", "QPSK 1/2"},
 212        {"18", "QPSK 3/4"},
 213        {"24", "16QAM 1/2"},
 214        {"36", "16QAM 3/4"},
 215        {"48", "64QAM 2/3"},
 216        {"54", "64QAM 3/4"},
 217        {"60", "64QAM 5/6"},
 218};
 219
 220#define MCS_IDX_PER_STREAM      (8)
 221
 222static inline u8
 223il4965_rs_extract_rate(u32 rate_n_flags)
 224{
 225        return (u8) (rate_n_flags & 0xFF);
 226}
 227
 228static void
 229il4965_rs_rate_scale_clear_win(struct il_rate_scale_data *win)
 230{
 231        win->data = 0;
 232        win->success_counter = 0;
 233        win->success_ratio = IL_INVALID_VALUE;
 234        win->counter = 0;
 235        win->average_tpt = IL_INVALID_VALUE;
 236        win->stamp = 0;
 237}
 238
 239static inline u8
 240il4965_rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 241{
 242        return (ant_type & valid_antenna) == ant_type;
 243}
 244
 245/*
 246 *      removes the old data from the stats. All data that is older than
 247 *      TID_MAX_TIME_DIFF, will be deleted.
 248 */
 249static void
 250il4965_rs_tl_rm_old_stats(struct il_traffic_load *tl, u32 curr_time)
 251{
 252        /* The oldest age we want to keep */
 253        u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 254
 255        while (tl->queue_count && tl->time_stamp < oldest_time) {
 256                tl->total -= tl->packet_count[tl->head];
 257                tl->packet_count[tl->head] = 0;
 258                tl->time_stamp += TID_QUEUE_CELL_SPACING;
 259                tl->queue_count--;
 260                tl->head++;
 261                if (tl->head >= TID_QUEUE_MAX_SIZE)
 262                        tl->head = 0;
 263        }
 264}
 265
 266/*
 267 *      increment traffic load value for tid and also remove
 268 *      any old values if passed the certain time period
 269 */
 270static u8
 271il4965_rs_tl_add_packet(struct il_lq_sta *lq_data, struct ieee80211_hdr *hdr)
 272{
 273        u32 curr_time = jiffies_to_msecs(jiffies);
 274        u32 time_diff;
 275        s32 idx;
 276        struct il_traffic_load *tl = NULL;
 277        u8 tid;
 278
 279        if (ieee80211_is_data_qos(hdr->frame_control)) {
 280                u8 *qc = ieee80211_get_qos_ctl(hdr);
 281                tid = qc[0] & 0xf;
 282        } else
 283                return MAX_TID_COUNT;
 284
 285        if (unlikely(tid >= TID_MAX_LOAD_COUNT))
 286                return MAX_TID_COUNT;
 287
 288        tl = &lq_data->load[tid];
 289
 290        curr_time -= curr_time % TID_ROUND_VALUE;
 291
 292        /* Happens only for the first packet. Initialize the data */
 293        if (!(tl->queue_count)) {
 294                tl->total = 1;
 295                tl->time_stamp = curr_time;
 296                tl->queue_count = 1;
 297                tl->head = 0;
 298                tl->packet_count[0] = 1;
 299                return MAX_TID_COUNT;
 300        }
 301
 302        time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 303        idx = time_diff / TID_QUEUE_CELL_SPACING;
 304
 305        /* The history is too long: remove data that is older than */
 306        /* TID_MAX_TIME_DIFF */
 307        if (idx >= TID_QUEUE_MAX_SIZE)
 308                il4965_rs_tl_rm_old_stats(tl, curr_time);
 309
 310        idx = (tl->head + idx) % TID_QUEUE_MAX_SIZE;
 311        tl->packet_count[idx] = tl->packet_count[idx] + 1;
 312        tl->total = tl->total + 1;
 313
 314        if ((idx + 1) > tl->queue_count)
 315                tl->queue_count = idx + 1;
 316
 317        return tid;
 318}
 319
 320/*
 321        get the traffic load value for tid
 322*/
 323static u32
 324il4965_rs_tl_get_load(struct il_lq_sta *lq_data, u8 tid)
 325{
 326        u32 curr_time = jiffies_to_msecs(jiffies);
 327        u32 time_diff;
 328        s32 idx;
 329        struct il_traffic_load *tl = NULL;
 330
 331        if (tid >= TID_MAX_LOAD_COUNT)
 332                return 0;
 333
 334        tl = &(lq_data->load[tid]);
 335
 336        curr_time -= curr_time % TID_ROUND_VALUE;
 337
 338        if (!(tl->queue_count))
 339                return 0;
 340
 341        time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 342        idx = time_diff / TID_QUEUE_CELL_SPACING;
 343
 344        /* The history is too long: remove data that is older than */
 345        /* TID_MAX_TIME_DIFF */
 346        if (idx >= TID_QUEUE_MAX_SIZE)
 347                il4965_rs_tl_rm_old_stats(tl, curr_time);
 348
 349        return tl->total;
 350}
 351
 352static int
 353il4965_rs_tl_turn_on_agg_for_tid(struct il_priv *il, struct il_lq_sta *lq_data,
 354                                 u8 tid, struct ieee80211_sta *sta)
 355{
 356        int ret = -EAGAIN;
 357        u32 load;
 358
 359        load = il4965_rs_tl_get_load(lq_data, tid);
 360
 361        if (load > IL_AGG_LOAD_THRESHOLD) {
 362                D_HT("Starting Tx agg: STA: %pM tid: %d\n", sta->addr, tid);
 363                ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 364                if (ret == -EAGAIN) {
 365                        /*
 366                         * driver and mac80211 is out of sync
 367                         * this might be cause by reloading firmware
 368                         * stop the tx ba session here
 369                         */
 370                        IL_ERR("Fail start Tx agg on tid: %d\n", tid);
 371                        ieee80211_stop_tx_ba_session(sta, tid);
 372                }
 373        } else
 374                D_HT("Aggregation not enabled for tid %d because load = %u\n",
 375                     tid, load);
 376
 377        return ret;
 378}
 379
 380static void
 381il4965_rs_tl_turn_on_agg(struct il_priv *il, u8 tid, struct il_lq_sta *lq_data,
 382                         struct ieee80211_sta *sta)
 383{
 384        if (tid < TID_MAX_LOAD_COUNT)
 385                il4965_rs_tl_turn_on_agg_for_tid(il, lq_data, tid, sta);
 386        else
 387                IL_ERR("tid exceeds max load count: %d/%d\n", tid,
 388                       TID_MAX_LOAD_COUNT);
 389}
 390
 391static inline int
 392il4965_get_il4965_num_of_ant_from_rate(u32 rate_n_flags)
 393{
 394        return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 395            !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 396            !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 397}
 398
 399/*
 400 * Static function to get the expected throughput from an il_scale_tbl_info
 401 * that wraps a NULL pointer check
 402 */
 403static s32
 404il4965_get_expected_tpt(struct il_scale_tbl_info *tbl, int rs_idx)
 405{
 406        if (tbl->expected_tpt)
 407                return tbl->expected_tpt[rs_idx];
 408        return 0;
 409}
 410
 411/**
 412 * il4965_rs_collect_tx_data - Update the success/failure sliding win
 413 *
 414 * We keep a sliding win of the last 62 packets transmitted
 415 * at this rate.  win->data contains the bitmask of successful
 416 * packets.
 417 */
 418static int
 419il4965_rs_collect_tx_data(struct il_scale_tbl_info *tbl, int scale_idx,
 420                          int attempts, int successes)
 421{
 422        struct il_rate_scale_data *win = NULL;
 423        static const u64 mask = (((u64) 1) << (RATE_MAX_WINDOW - 1));
 424        s32 fail_count, tpt;
 425
 426        if (scale_idx < 0 || scale_idx >= RATE_COUNT)
 427                return -EINVAL;
 428
 429        /* Select win for current tx bit rate */
 430        win = &(tbl->win[scale_idx]);
 431
 432        /* Get expected throughput */
 433        tpt = il4965_get_expected_tpt(tbl, scale_idx);
 434
 435        /*
 436         * Keep track of only the latest 62 tx frame attempts in this rate's
 437         * history win; anything older isn't really relevant any more.
 438         * If we have filled up the sliding win, drop the oldest attempt;
 439         * if the oldest attempt (highest bit in bitmap) shows "success",
 440         * subtract "1" from the success counter (this is the main reason
 441         * we keep these bitmaps!).
 442         */
 443        while (attempts > 0) {
 444                if (win->counter >= RATE_MAX_WINDOW) {
 445
 446                        /* remove earliest */
 447                        win->counter = RATE_MAX_WINDOW - 1;
 448
 449                        if (win->data & mask) {
 450                                win->data &= ~mask;
 451                                win->success_counter--;
 452                        }
 453                }
 454
 455                /* Increment frames-attempted counter */
 456                win->counter++;
 457
 458                /* Shift bitmap by one frame to throw away oldest history */
 459                win->data <<= 1;
 460
 461                /* Mark the most recent #successes attempts as successful */
 462                if (successes > 0) {
 463                        win->success_counter++;
 464                        win->data |= 0x1;
 465                        successes--;
 466                }
 467
 468                attempts--;
 469        }
 470
 471        /* Calculate current success ratio, avoid divide-by-0! */
 472        if (win->counter > 0)
 473                win->success_ratio =
 474                    128 * (100 * win->success_counter) / win->counter;
 475        else
 476                win->success_ratio = IL_INVALID_VALUE;
 477
 478        fail_count = win->counter - win->success_counter;
 479
 480        /* Calculate average throughput, if we have enough history. */
 481        if (fail_count >= RATE_MIN_FAILURE_TH ||
 482            win->success_counter >= RATE_MIN_SUCCESS_TH)
 483                win->average_tpt = (win->success_ratio * tpt + 64) / 128;
 484        else
 485                win->average_tpt = IL_INVALID_VALUE;
 486
 487        /* Tag this win as having been updated */
 488        win->stamp = jiffies;
 489
 490        return 0;
 491}
 492
 493/*
 494 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 495 */
 496static u32
 497il4965_rate_n_flags_from_tbl(struct il_priv *il, struct il_scale_tbl_info *tbl,
 498                             int idx, u8 use_green)
 499{
 500        u32 rate_n_flags = 0;
 501
 502        if (is_legacy(tbl->lq_type)) {
 503                rate_n_flags = il_rates[idx].plcp;
 504                if (idx >= IL_FIRST_CCK_RATE && idx <= IL_LAST_CCK_RATE)
 505                        rate_n_flags |= RATE_MCS_CCK_MSK;
 506
 507        } else if (is_Ht(tbl->lq_type)) {
 508                if (idx > IL_LAST_OFDM_RATE) {
 509                        IL_ERR("Invalid HT rate idx %d\n", idx);
 510                        idx = IL_LAST_OFDM_RATE;
 511                }
 512                rate_n_flags = RATE_MCS_HT_MSK;
 513
 514                if (is_siso(tbl->lq_type))
 515                        rate_n_flags |= il_rates[idx].plcp_siso;
 516                else
 517                        rate_n_flags |= il_rates[idx].plcp_mimo2;
 518        } else {
 519                IL_ERR("Invalid tbl->lq_type %d\n", tbl->lq_type);
 520        }
 521
 522        rate_n_flags |=
 523            ((tbl->ant_type << RATE_MCS_ANT_POS) & RATE_MCS_ANT_ABC_MSK);
 524
 525        if (is_Ht(tbl->lq_type)) {
 526                if (tbl->is_ht40) {
 527                        if (tbl->is_dup)
 528                                rate_n_flags |= RATE_MCS_DUP_MSK;
 529                        else
 530                                rate_n_flags |= RATE_MCS_HT40_MSK;
 531                }
 532                if (tbl->is_SGI)
 533                        rate_n_flags |= RATE_MCS_SGI_MSK;
 534
 535                if (use_green) {
 536                        rate_n_flags |= RATE_MCS_GF_MSK;
 537                        if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 538                                rate_n_flags &= ~RATE_MCS_SGI_MSK;
 539                                IL_ERR("GF was set with SGI:SISO\n");
 540                        }
 541                }
 542        }
 543        return rate_n_flags;
 544}
 545
 546/*
 547 * Interpret uCode API's rate_n_flags format,
 548 * fill "search" or "active" tx mode table.
 549 */
 550static int
 551il4965_rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 552                                enum nl80211_band band,
 553                                struct il_scale_tbl_info *tbl, int *rate_idx)
 554{
 555        u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 556        u8 il4965_num_of_ant =
 557            il4965_get_il4965_num_of_ant_from_rate(rate_n_flags);
 558        u8 mcs;
 559
 560        memset(tbl, 0, sizeof(struct il_scale_tbl_info));
 561        *rate_idx = il4965_hwrate_to_plcp_idx(rate_n_flags);
 562
 563        if (*rate_idx == RATE_INVALID) {
 564                *rate_idx = -1;
 565                return -EINVAL;
 566        }
 567        tbl->is_SGI = 0;        /* default legacy setup */
 568        tbl->is_ht40 = 0;
 569        tbl->is_dup = 0;
 570        tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 571        tbl->lq_type = LQ_NONE;
 572        tbl->max_search = IL_MAX_SEARCH;
 573
 574        /* legacy rate format */
 575        if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 576                if (il4965_num_of_ant == 1) {
 577                        if (band == NL80211_BAND_5GHZ)
 578                                tbl->lq_type = LQ_A;
 579                        else
 580                                tbl->lq_type = LQ_G;
 581                }
 582                /* HT rate format */
 583        } else {
 584                if (rate_n_flags & RATE_MCS_SGI_MSK)
 585                        tbl->is_SGI = 1;
 586
 587                if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
 588                    (rate_n_flags & RATE_MCS_DUP_MSK))
 589                        tbl->is_ht40 = 1;
 590
 591                if (rate_n_flags & RATE_MCS_DUP_MSK)
 592                        tbl->is_dup = 1;
 593
 594                mcs = il4965_rs_extract_rate(rate_n_flags);
 595
 596                /* SISO */
 597                if (mcs <= RATE_SISO_60M_PLCP) {
 598                        if (il4965_num_of_ant == 1)
 599                                tbl->lq_type = LQ_SISO; /*else NONE */
 600                        /* MIMO2 */
 601                } else {
 602                        if (il4965_num_of_ant == 2)
 603                                tbl->lq_type = LQ_MIMO2;
 604                }
 605        }
 606        return 0;
 607}
 608
 609/* switch to another antenna/antennas and return 1 */
 610/* if no other valid antenna found, return 0 */
 611static int
 612il4965_rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 613                         struct il_scale_tbl_info *tbl)
 614{
 615        u8 new_ant_type;
 616
 617        if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 618                return 0;
 619
 620        if (!il4965_rs_is_valid_ant(valid_ant, tbl->ant_type))
 621                return 0;
 622
 623        new_ant_type = ant_toggle_lookup[tbl->ant_type];
 624
 625        while (new_ant_type != tbl->ant_type &&
 626               !il4965_rs_is_valid_ant(valid_ant, new_ant_type))
 627                new_ant_type = ant_toggle_lookup[new_ant_type];
 628
 629        if (new_ant_type == tbl->ant_type)
 630                return 0;
 631
 632        tbl->ant_type = new_ant_type;
 633        *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 634        *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 635        return 1;
 636}
 637
 638/**
 639 * Green-field mode is valid if the station supports it and
 640 * there are no non-GF stations present in the BSS.
 641 */
 642static bool
 643il4965_rs_use_green(struct il_priv *il, struct ieee80211_sta *sta)
 644{
 645        return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
 646               !il->ht.non_gf_sta_present;
 647}
 648
 649/**
 650 * il4965_rs_get_supported_rates - get the available rates
 651 *
 652 * if management frame or broadcast frame only return
 653 * basic available rates.
 654 *
 655 */
 656static u16
 657il4965_rs_get_supported_rates(struct il_lq_sta *lq_sta,
 658                              struct ieee80211_hdr *hdr,
 659                              enum il_table_type rate_type)
 660{
 661        if (is_legacy(rate_type)) {
 662                return lq_sta->active_legacy_rate;
 663        } else {
 664                if (is_siso(rate_type))
 665                        return lq_sta->active_siso_rate;
 666                else
 667                        return lq_sta->active_mimo2_rate;
 668        }
 669}
 670
 671static u16
 672il4965_rs_get_adjacent_rate(struct il_priv *il, u8 idx, u16 rate_mask,
 673                            int rate_type)
 674{
 675        u8 high = RATE_INVALID;
 676        u8 low = RATE_INVALID;
 677
 678        /* 802.11A or ht walks to the next literal adjacent rate in
 679         * the rate table */
 680        if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 681                int i;
 682                u32 mask;
 683
 684                /* Find the previous rate that is in the rate mask */
 685                i = idx - 1;
 686                for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 687                        if (rate_mask & mask) {
 688                                low = i;
 689                                break;
 690                        }
 691                }
 692
 693                /* Find the next rate that is in the rate mask */
 694                i = idx + 1;
 695                for (mask = (1 << i); i < RATE_COUNT; i++, mask <<= 1) {
 696                        if (rate_mask & mask) {
 697                                high = i;
 698                                break;
 699                        }
 700                }
 701
 702                return (high << 8) | low;
 703        }
 704
 705        low = idx;
 706        while (low != RATE_INVALID) {
 707                low = il_rates[low].prev_rs;
 708                if (low == RATE_INVALID)
 709                        break;
 710                if (rate_mask & (1 << low))
 711                        break;
 712                D_RATE("Skipping masked lower rate: %d\n", low);
 713        }
 714
 715        high = idx;
 716        while (high != RATE_INVALID) {
 717                high = il_rates[high].next_rs;
 718                if (high == RATE_INVALID)
 719                        break;
 720                if (rate_mask & (1 << high))
 721                        break;
 722                D_RATE("Skipping masked higher rate: %d\n", high);
 723        }
 724
 725        return (high << 8) | low;
 726}
 727
 728static u32
 729il4965_rs_get_lower_rate(struct il_lq_sta *lq_sta,
 730                         struct il_scale_tbl_info *tbl, u8 scale_idx,
 731                         u8 ht_possible)
 732{
 733        s32 low;
 734        u16 rate_mask;
 735        u16 high_low;
 736        u8 switch_to_legacy = 0;
 737        u8 is_green = lq_sta->is_green;
 738        struct il_priv *il = lq_sta->drv;
 739
 740        /* check if we need to switch from HT to legacy rates.
 741         * assumption is that mandatory rates (1Mbps or 6Mbps)
 742         * are always supported (spec demand) */
 743        if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_idx)) {
 744                switch_to_legacy = 1;
 745                scale_idx = rs_ht_to_legacy[scale_idx];
 746                if (lq_sta->band == NL80211_BAND_5GHZ)
 747                        tbl->lq_type = LQ_A;
 748                else
 749                        tbl->lq_type = LQ_G;
 750
 751                if (il4965_num_of_ant(tbl->ant_type) > 1)
 752                        tbl->ant_type =
 753                            il4965_first_antenna(il->hw_params.valid_tx_ant);
 754
 755                tbl->is_ht40 = 0;
 756                tbl->is_SGI = 0;
 757                tbl->max_search = IL_MAX_SEARCH;
 758        }
 759
 760        rate_mask = il4965_rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 761
 762        /* Mask with station rate restriction */
 763        if (is_legacy(tbl->lq_type)) {
 764                /* supp_rates has no CCK bits in A mode */
 765                if (lq_sta->band == NL80211_BAND_5GHZ)
 766                        rate_mask =
 767                            (u16) (rate_mask &
 768                                   (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
 769                else
 770                        rate_mask = (u16) (rate_mask & lq_sta->supp_rates);
 771        }
 772
 773        /* If we switched from HT to legacy, check current rate */
 774        if (switch_to_legacy && (rate_mask & (1 << scale_idx))) {
 775                low = scale_idx;
 776                goto out;
 777        }
 778
 779        high_low =
 780            il4965_rs_get_adjacent_rate(lq_sta->drv, scale_idx, rate_mask,
 781                                        tbl->lq_type);
 782        low = high_low & 0xff;
 783
 784        if (low == RATE_INVALID)
 785                low = scale_idx;
 786
 787out:
 788        return il4965_rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 789}
 790
 791/*
 792 * Simple function to compare two rate scale table types
 793 */
 794static bool
 795il4965_table_type_matches(struct il_scale_tbl_info *a,
 796                          struct il_scale_tbl_info *b)
 797{
 798        return (a->lq_type == b->lq_type && a->ant_type == b->ant_type &&
 799                a->is_SGI == b->is_SGI);
 800}
 801
 802/*
 803 * mac80211 sends us Tx status
 804 */
 805static void
 806il4965_rs_tx_status(void *il_r, struct ieee80211_supported_band *sband,
 807                    struct ieee80211_sta *sta, void *il_sta,
 808                    struct sk_buff *skb)
 809{
 810        int legacy_success;
 811        int retries;
 812        int rs_idx, mac_idx, i;
 813        struct il_lq_sta *lq_sta = il_sta;
 814        struct il_link_quality_cmd *table;
 815        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 816        struct il_priv *il = (struct il_priv *)il_r;
 817        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 818        enum mac80211_rate_control_flags mac_flags;
 819        u32 tx_rate;
 820        struct il_scale_tbl_info tbl_type;
 821        struct il_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 822
 823        D_RATE("get frame ack response, update rate scale win\n");
 824
 825        /* Treat uninitialized rate scaling data same as non-existing. */
 826        if (!lq_sta) {
 827                D_RATE("Station rate scaling not created yet.\n");
 828                return;
 829        } else if (!lq_sta->drv) {
 830                D_RATE("Rate scaling not initialized yet.\n");
 831                return;
 832        }
 833
 834        if (!ieee80211_is_data(hdr->frame_control) ||
 835            (info->flags & IEEE80211_TX_CTL_NO_ACK))
 836                return;
 837
 838        /* This packet was aggregated but doesn't carry status info */
 839        if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 840            !(info->flags & IEEE80211_TX_STAT_AMPDU))
 841                return;
 842
 843        /*
 844         * Ignore this Tx frame response if its initial rate doesn't match
 845         * that of latest Link Quality command.  There may be stragglers
 846         * from a previous Link Quality command, but we're no longer interested
 847         * in those; they're either from the "active" mode while we're trying
 848         * to check "search" mode, or a prior "search" mode after we've moved
 849         * to a new "search" mode (which might become the new "active" mode).
 850         */
 851        table = &lq_sta->lq;
 852        tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 853        il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type, &rs_idx);
 854        if (il->band == NL80211_BAND_5GHZ)
 855                rs_idx -= IL_FIRST_OFDM_RATE;
 856        mac_flags = info->status.rates[0].flags;
 857        mac_idx = info->status.rates[0].idx;
 858        /* For HT packets, map MCS to PLCP */
 859        if (mac_flags & IEEE80211_TX_RC_MCS) {
 860                mac_idx &= RATE_MCS_CODE_MSK;   /* Remove # of streams */
 861                if (mac_idx >= (RATE_9M_IDX - IL_FIRST_OFDM_RATE))
 862                        mac_idx++;
 863                /*
 864                 * mac80211 HT idx is always zero-idxed; we need to move
 865                 * HT OFDM rates after CCK rates in 2.4 GHz band
 866                 */
 867                if (il->band == NL80211_BAND_2GHZ)
 868                        mac_idx += IL_FIRST_OFDM_RATE;
 869        }
 870        /* Here we actually compare this rate to the latest LQ command */
 871        if (mac_idx < 0 ||
 872            tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI) ||
 873            tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ||
 874            tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA) ||
 875            tbl_type.ant_type != info->status.antenna ||
 876            !!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)
 877            || !!(tx_rate & RATE_MCS_GF_MSK) !=
 878            !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD) || rs_idx != mac_idx) {
 879                D_RATE("initial rate %d does not match %d (0x%x)\n", mac_idx,
 880                       rs_idx, tx_rate);
 881                /*
 882                 * Since rates mis-match, the last LQ command may have failed.
 883                 * After IL_MISSED_RATE_MAX mis-matches, resync the uCode with
 884                 * ... driver.
 885                 */
 886                lq_sta->missed_rate_counter++;
 887                if (lq_sta->missed_rate_counter > IL_MISSED_RATE_MAX) {
 888                        lq_sta->missed_rate_counter = 0;
 889                        il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
 890                }
 891                /* Regardless, ignore this status info for outdated rate */
 892                return;
 893        } else
 894                /* Rate did match, so reset the missed_rate_counter */
 895                lq_sta->missed_rate_counter = 0;
 896
 897        /* Figure out if rate scale algorithm is in active or search table */
 898        if (il4965_table_type_matches
 899            (&tbl_type, &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 900                curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 901                other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 902        } else
 903            if (il4965_table_type_matches
 904                (&tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
 905                curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 906                other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 907        } else {
 908                D_RATE("Neither active nor search matches tx rate\n");
 909                tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 910                D_RATE("active- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
 911                       tmp_tbl->ant_type, tmp_tbl->is_SGI);
 912                tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 913                D_RATE("search- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
 914                       tmp_tbl->ant_type, tmp_tbl->is_SGI);
 915                D_RATE("actual- lq:%x, ant:%x, SGI:%d\n", tbl_type.lq_type,
 916                       tbl_type.ant_type, tbl_type.is_SGI);
 917                /*
 918                 * no matching table found, let's by-pass the data collection
 919                 * and continue to perform rate scale to find the rate table
 920                 */
 921                il4965_rs_stay_in_table(lq_sta, true);
 922                goto done;
 923        }
 924
 925        /*
 926         * Updating the frame history depends on whether packets were
 927         * aggregated.
 928         *
 929         * For aggregation, all packets were transmitted at the same rate, the
 930         * first idx into rate scale table.
 931         */
 932        if (info->flags & IEEE80211_TX_STAT_AMPDU) {
 933                tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 934                il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type,
 935                                                &rs_idx);
 936                il4965_rs_collect_tx_data(curr_tbl, rs_idx,
 937                                          info->status.ampdu_len,
 938                                          info->status.ampdu_ack_len);
 939
 940                /* Update success/fail counts if not searching for new mode */
 941                if (lq_sta->stay_in_tbl) {
 942                        lq_sta->total_success += info->status.ampdu_ack_len;
 943                        lq_sta->total_failed +=
 944                            (info->status.ampdu_len -
 945                             info->status.ampdu_ack_len);
 946                }
 947        } else {
 948                /*
 949                 * For legacy, update frame history with for each Tx retry.
 950                 */
 951                retries = info->status.rates[0].count - 1;
 952                /* HW doesn't send more than 15 retries */
 953                retries = min(retries, 15);
 954
 955                /* The last transmission may have been successful */
 956                legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
 957                /* Collect data for each rate used during failed TX attempts */
 958                for (i = 0; i <= retries; ++i) {
 959                        tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
 960                        il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band,
 961                                                        &tbl_type, &rs_idx);
 962                        /*
 963                         * Only collect stats if retried rate is in the same RS
 964                         * table as active/search.
 965                         */
 966                        if (il4965_table_type_matches(&tbl_type, curr_tbl))
 967                                tmp_tbl = curr_tbl;
 968                        else if (il4965_table_type_matches
 969                                 (&tbl_type, other_tbl))
 970                                tmp_tbl = other_tbl;
 971                        else
 972                                continue;
 973                        il4965_rs_collect_tx_data(tmp_tbl, rs_idx, 1,
 974                                                  i <
 975                                                  retries ? 0 : legacy_success);
 976                }
 977
 978                /* Update success/fail counts if not searching for new mode */
 979                if (lq_sta->stay_in_tbl) {
 980                        lq_sta->total_success += legacy_success;
 981                        lq_sta->total_failed += retries + (1 - legacy_success);
 982                }
 983        }
 984        /* The last TX rate is cached in lq_sta; it's set in if/else above */
 985        lq_sta->last_rate_n_flags = tx_rate;
 986done:
 987        /* See if there's a better rate or modulation mode to try. */
 988        if (sta->supp_rates[sband->band])
 989                il4965_rs_rate_scale_perform(il, skb, sta, lq_sta);
 990}
 991
 992/*
 993 * Begin a period of staying with a selected modulation mode.
 994 * Set "stay_in_tbl" flag to prevent any mode switches.
 995 * Set frame tx success limits according to legacy vs. high-throughput,
 996 * and reset overall (spanning all rates) tx success history stats.
 997 * These control how long we stay using same modulation mode before
 998 * searching for a new mode.
 999 */
1000static void
1001il4965_rs_set_stay_in_table(struct il_priv *il, u8 is_legacy,
1002                            struct il_lq_sta *lq_sta)
1003{
1004        D_RATE("we are staying in the same table\n");
1005        lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1006        if (is_legacy) {
1007                lq_sta->table_count_limit = IL_LEGACY_TBL_COUNT;
1008                lq_sta->max_failure_limit = IL_LEGACY_FAILURE_LIMIT;
1009                lq_sta->max_success_limit = IL_LEGACY_SUCCESS_LIMIT;
1010        } else {
1011                lq_sta->table_count_limit = IL_NONE_LEGACY_TBL_COUNT;
1012                lq_sta->max_failure_limit = IL_NONE_LEGACY_FAILURE_LIMIT;
1013                lq_sta->max_success_limit = IL_NONE_LEGACY_SUCCESS_LIMIT;
1014        }
1015        lq_sta->table_count = 0;
1016        lq_sta->total_failed = 0;
1017        lq_sta->total_success = 0;
1018        lq_sta->flush_timer = jiffies;
1019        lq_sta->action_counter = 0;
1020}
1021
1022/*
1023 * Find correct throughput table for given mode of modulation
1024 */
1025static void
1026il4965_rs_set_expected_tpt_table(struct il_lq_sta *lq_sta,
1027                                 struct il_scale_tbl_info *tbl)
1028{
1029        /* Used to choose among HT tables */
1030        s32(*ht_tbl_pointer)[RATE_COUNT];
1031
1032        /* Check for invalid LQ type */
1033        if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1034                tbl->expected_tpt = expected_tpt_legacy;
1035                return;
1036        }
1037
1038        /* Legacy rates have only one table */
1039        if (is_legacy(tbl->lq_type)) {
1040                tbl->expected_tpt = expected_tpt_legacy;
1041                return;
1042        }
1043
1044        /* Choose among many HT tables depending on number of streams
1045         * (SISO/MIMO2), channel width (20/40), SGI, and aggregation
1046         * status */
1047        if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1048                ht_tbl_pointer = expected_tpt_siso20MHz;
1049        else if (is_siso(tbl->lq_type))
1050                ht_tbl_pointer = expected_tpt_siso40MHz;
1051        else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1052                ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1053        else                    /* if (is_mimo2(tbl->lq_type)) <-- must be true */
1054                ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1055
1056        if (!tbl->is_SGI && !lq_sta->is_agg)    /* Normal */
1057                tbl->expected_tpt = ht_tbl_pointer[0];
1058        else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1059                tbl->expected_tpt = ht_tbl_pointer[1];
1060        else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1061                tbl->expected_tpt = ht_tbl_pointer[2];
1062        else                    /* AGG+SGI */
1063                tbl->expected_tpt = ht_tbl_pointer[3];
1064}
1065
1066/*
1067 * Find starting rate for new "search" high-throughput mode of modulation.
1068 * Goal is to find lowest expected rate (under perfect conditions) that is
1069 * above the current measured throughput of "active" mode, to give new mode
1070 * a fair chance to prove itself without too many challenges.
1071 *
1072 * This gets called when transitioning to more aggressive modulation
1073 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1074 * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1075 * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1076 * bit rate will typically need to increase, but not if performance was bad.
1077 */
1078static s32
1079il4965_rs_get_best_rate(struct il_priv *il, struct il_lq_sta *lq_sta,
1080                        struct il_scale_tbl_info *tbl,  /* "search" */
1081                        u16 rate_mask, s8 idx)
1082{
1083        /* "active" values */
1084        struct il_scale_tbl_info *active_tbl =
1085            &(lq_sta->lq_info[lq_sta->active_tbl]);
1086        s32 active_sr = active_tbl->win[idx].success_ratio;
1087        s32 active_tpt = active_tbl->expected_tpt[idx];
1088
1089        /* expected "search" throughput */
1090        s32 *tpt_tbl = tbl->expected_tpt;
1091
1092        s32 new_rate, high, low, start_hi;
1093        u16 high_low;
1094        s8 rate = idx;
1095
1096        new_rate = high = low = start_hi = RATE_INVALID;
1097
1098        for (;;) {
1099                high_low =
1100                    il4965_rs_get_adjacent_rate(il, rate, rate_mask,
1101                                                tbl->lq_type);
1102
1103                low = high_low & 0xff;
1104                high = (high_low >> 8) & 0xff;
1105
1106                /*
1107                 * Lower the "search" bit rate, to give new "search" mode
1108                 * approximately the same throughput as "active" if:
1109                 *
1110                 * 1) "Active" mode has been working modestly well (but not
1111                 *    great), and expected "search" throughput (under perfect
1112                 *    conditions) at candidate rate is above the actual
1113                 *    measured "active" throughput (but less than expected
1114                 *    "active" throughput under perfect conditions).
1115                 * OR
1116                 * 2) "Active" mode has been working perfectly or very well
1117                 *    and expected "search" throughput (under perfect
1118                 *    conditions) at candidate rate is above expected
1119                 *    "active" throughput (under perfect conditions).
1120                 */
1121                if ((100 * tpt_tbl[rate] > lq_sta->last_tpt &&
1122                     (active_sr > RATE_DECREASE_TH && active_sr <= RATE_HIGH_TH
1123                      && tpt_tbl[rate] <= active_tpt)) ||
1124                    (active_sr >= RATE_SCALE_SWITCH &&
1125                     tpt_tbl[rate] > active_tpt)) {
1126
1127                        /* (2nd or later pass)
1128                         * If we've already tried to raise the rate, and are
1129                         * now trying to lower it, use the higher rate. */
1130                        if (start_hi != RATE_INVALID) {
1131                                new_rate = start_hi;
1132                                break;
1133                        }
1134
1135                        new_rate = rate;
1136
1137                        /* Loop again with lower rate */
1138                        if (low != RATE_INVALID)
1139                                rate = low;
1140
1141                        /* Lower rate not available, use the original */
1142                        else
1143                                break;
1144
1145                        /* Else try to raise the "search" rate to match "active" */
1146                } else {
1147                        /* (2nd or later pass)
1148                         * If we've already tried to lower the rate, and are
1149                         * now trying to raise it, use the lower rate. */
1150                        if (new_rate != RATE_INVALID)
1151                                break;
1152
1153                        /* Loop again with higher rate */
1154                        else if (high != RATE_INVALID) {
1155                                start_hi = high;
1156                                rate = high;
1157
1158                                /* Higher rate not available, use the original */
1159                        } else {
1160                                new_rate = rate;
1161                                break;
1162                        }
1163                }
1164        }
1165
1166        return new_rate;
1167}
1168
1169/*
1170 * Set up search table for MIMO2
1171 */
1172static int
1173il4965_rs_switch_to_mimo2(struct il_priv *il, struct il_lq_sta *lq_sta,
1174                          struct ieee80211_conf *conf,
1175                          struct ieee80211_sta *sta,
1176                          struct il_scale_tbl_info *tbl, int idx)
1177{
1178        u16 rate_mask;
1179        s32 rate;
1180        s8 is_green = lq_sta->is_green;
1181
1182        if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1183                return -1;
1184
1185        if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1186                return -1;
1187
1188        /* Need both Tx chains/antennas to support MIMO */
1189        if (il->hw_params.tx_chains_num < 2)
1190                return -1;
1191
1192        D_RATE("LQ: try to switch to MIMO2\n");
1193
1194        tbl->lq_type = LQ_MIMO2;
1195        tbl->is_dup = lq_sta->is_dup;
1196        tbl->action = 0;
1197        tbl->max_search = IL_MAX_SEARCH;
1198        rate_mask = lq_sta->active_mimo2_rate;
1199
1200        if (il_is_ht40_tx_allowed(il, &sta->ht_cap))
1201                tbl->is_ht40 = 1;
1202        else
1203                tbl->is_ht40 = 0;
1204
1205        il4965_rs_set_expected_tpt_table(lq_sta, tbl);
1206
1207        rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
1208
1209        D_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1210        if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
1211                D_RATE("Can't switch with idx %d rate mask %x\n", rate,
1212                       rate_mask);
1213                return -1;
1214        }
1215        tbl->current_rate =
1216            il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
1217
1218        D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
1219               is_green);
1220        return 0;
1221}
1222
1223/*
1224 * Set up search table for SISO
1225 */
1226static int
1227il4965_rs_switch_to_siso(struct il_priv *il, struct il_lq_sta *lq_sta,
1228                         struct ieee80211_conf *conf, struct ieee80211_sta *sta,
1229                         struct il_scale_tbl_info *tbl, int idx)
1230{
1231        u16 rate_mask;
1232        u8 is_green = lq_sta->is_green;
1233        s32 rate;
1234
1235        if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1236                return -1;
1237
1238        D_RATE("LQ: try to switch to SISO\n");
1239
1240        tbl->is_dup = lq_sta->is_dup;
1241        tbl->lq_type = LQ_SISO;
1242        tbl->action = 0;
1243        tbl->max_search = IL_MAX_SEARCH;
1244        rate_mask = lq_sta->active_siso_rate;
1245
1246        if (il_is_ht40_tx_allowed(il, &sta->ht_cap))
1247                tbl->is_ht40 = 1;
1248        else
1249                tbl->is_ht40 = 0;
1250
1251        if (is_green)
1252                tbl->is_SGI = 0;        /*11n spec: no SGI in SISO+Greenfield */
1253
1254        il4965_rs_set_expected_tpt_table(lq_sta, tbl);
1255        rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
1256
1257        D_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1258        if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
1259                D_RATE("can not switch with idx %d rate mask %x\n", rate,
1260                       rate_mask);
1261                return -1;
1262        }
1263        tbl->current_rate =
1264            il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
1265        D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
1266               is_green);
1267        return 0;
1268}
1269
1270/*
1271 * Try to switch to new modulation mode from legacy
1272 */
1273static int
1274il4965_rs_move_legacy_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1275                            struct ieee80211_conf *conf,
1276                            struct ieee80211_sta *sta, int idx)
1277{
1278        struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1279        struct il_scale_tbl_info *search_tbl =
1280            &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1281        struct il_rate_scale_data *win = &(tbl->win[idx]);
1282        u32 sz =
1283            (sizeof(struct il_scale_tbl_info) -
1284             (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1285        u8 start_action;
1286        u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1287        u8 tx_chains_num = il->hw_params.tx_chains_num;
1288        int ret = 0;
1289        u8 update_search_tbl_counter = 0;
1290
1291        tbl->action = IL_LEGACY_SWITCH_SISO;
1292
1293        start_action = tbl->action;
1294        for (;;) {
1295                lq_sta->action_counter++;
1296                switch (tbl->action) {
1297                case IL_LEGACY_SWITCH_ANTENNA1:
1298                case IL_LEGACY_SWITCH_ANTENNA2:
1299                        D_RATE("LQ: Legacy toggle Antenna\n");
1300
1301                        if ((tbl->action == IL_LEGACY_SWITCH_ANTENNA1 &&
1302                             tx_chains_num <= 1) ||
1303                            (tbl->action == IL_LEGACY_SWITCH_ANTENNA2 &&
1304                             tx_chains_num <= 2))
1305                                break;
1306
1307                        /* Don't change antenna if success has been great */
1308                        if (win->success_ratio >= IL_RS_GOOD_RATIO)
1309                                break;
1310
1311                        /* Set up search table to try other antenna */
1312                        memcpy(search_tbl, tbl, sz);
1313
1314                        if (il4965_rs_toggle_antenna
1315                            (valid_tx_ant, &search_tbl->current_rate,
1316                             search_tbl)) {
1317                                update_search_tbl_counter = 1;
1318                                il4965_rs_set_expected_tpt_table(lq_sta,
1319                                                                 search_tbl);
1320                                goto out;
1321                        }
1322                        break;
1323                case IL_LEGACY_SWITCH_SISO:
1324                        D_RATE("LQ: Legacy switch to SISO\n");
1325
1326                        /* Set up search table to try SISO */
1327                        memcpy(search_tbl, tbl, sz);
1328                        search_tbl->is_SGI = 0;
1329                        ret =
1330                            il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
1331                                                     search_tbl, idx);
1332                        if (!ret) {
1333                                lq_sta->action_counter = 0;
1334                                goto out;
1335                        }
1336
1337                        break;
1338                case IL_LEGACY_SWITCH_MIMO2_AB:
1339                case IL_LEGACY_SWITCH_MIMO2_AC:
1340                case IL_LEGACY_SWITCH_MIMO2_BC:
1341                        D_RATE("LQ: Legacy switch to MIMO2\n");
1342
1343                        /* Set up search table to try MIMO */
1344                        memcpy(search_tbl, tbl, sz);
1345                        search_tbl->is_SGI = 0;
1346
1347                        if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AB)
1348                                search_tbl->ant_type = ANT_AB;
1349                        else if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AC)
1350                                search_tbl->ant_type = ANT_AC;
1351                        else
1352                                search_tbl->ant_type = ANT_BC;
1353
1354                        if (!il4965_rs_is_valid_ant
1355                            (valid_tx_ant, search_tbl->ant_type))
1356                                break;
1357
1358                        ret =
1359                            il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
1360                                                      search_tbl, idx);
1361                        if (!ret) {
1362                                lq_sta->action_counter = 0;
1363                                goto out;
1364                        }
1365                        break;
1366                }
1367                tbl->action++;
1368                if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
1369                        tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
1370
1371                if (tbl->action == start_action)
1372                        break;
1373
1374        }
1375        search_tbl->lq_type = LQ_NONE;
1376        return 0;
1377
1378out:
1379        lq_sta->search_better_tbl = 1;
1380        tbl->action++;
1381        if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
1382                tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
1383        if (update_search_tbl_counter)
1384                search_tbl->action = tbl->action;
1385        return 0;
1386
1387}
1388
1389/*
1390 * Try to switch to new modulation mode from SISO
1391 */
1392static int
1393il4965_rs_move_siso_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1394                             struct ieee80211_conf *conf,
1395                             struct ieee80211_sta *sta, int idx)
1396{
1397        u8 is_green = lq_sta->is_green;
1398        struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1399        struct il_scale_tbl_info *search_tbl =
1400            &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1401        struct il_rate_scale_data *win = &(tbl->win[idx]);
1402        struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1403        u32 sz =
1404            (sizeof(struct il_scale_tbl_info) -
1405             (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1406        u8 start_action;
1407        u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1408        u8 tx_chains_num = il->hw_params.tx_chains_num;
1409        u8 update_search_tbl_counter = 0;
1410        int ret;
1411
1412        start_action = tbl->action;
1413
1414        for (;;) {
1415                lq_sta->action_counter++;
1416                switch (tbl->action) {
1417                case IL_SISO_SWITCH_ANTENNA1:
1418                case IL_SISO_SWITCH_ANTENNA2:
1419                        D_RATE("LQ: SISO toggle Antenna\n");
1420                        if ((tbl->action == IL_SISO_SWITCH_ANTENNA1 &&
1421                             tx_chains_num <= 1) ||
1422                            (tbl->action == IL_SISO_SWITCH_ANTENNA2 &&
1423                             tx_chains_num <= 2))
1424                                break;
1425
1426                        if (win->success_ratio >= IL_RS_GOOD_RATIO)
1427                                break;
1428
1429                        memcpy(search_tbl, tbl, sz);
1430                        if (il4965_rs_toggle_antenna
1431                            (valid_tx_ant, &search_tbl->current_rate,
1432                             search_tbl)) {
1433                                update_search_tbl_counter = 1;
1434                                goto out;
1435                        }
1436                        break;
1437                case IL_SISO_SWITCH_MIMO2_AB:
1438                case IL_SISO_SWITCH_MIMO2_AC:
1439                case IL_SISO_SWITCH_MIMO2_BC:
1440                        D_RATE("LQ: SISO switch to MIMO2\n");
1441                        memcpy(search_tbl, tbl, sz);
1442                        search_tbl->is_SGI = 0;
1443
1444                        if (tbl->action == IL_SISO_SWITCH_MIMO2_AB)
1445                                search_tbl->ant_type = ANT_AB;
1446                        else if (tbl->action == IL_SISO_SWITCH_MIMO2_AC)
1447                                search_tbl->ant_type = ANT_AC;
1448                        else
1449                                search_tbl->ant_type = ANT_BC;
1450
1451                        if (!il4965_rs_is_valid_ant
1452                            (valid_tx_ant, search_tbl->ant_type))
1453                                break;
1454
1455                        ret =
1456                            il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
1457                                                      search_tbl, idx);
1458                        if (!ret)
1459                                goto out;
1460                        break;
1461                case IL_SISO_SWITCH_GI:
1462                        if (!tbl->is_ht40 &&
1463                            !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
1464                                break;
1465                        if (tbl->is_ht40 &&
1466                            !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
1467                                break;
1468
1469                        D_RATE("LQ: SISO toggle SGI/NGI\n");
1470
1471                        memcpy(search_tbl, tbl, sz);
1472                        if (is_green) {
1473                                if (!tbl->is_SGI)
1474                                        break;
1475                                else
1476                                        IL_ERR("SGI was set in GF+SISO\n");
1477                        }
1478                        search_tbl->is_SGI = !tbl->is_SGI;
1479                        il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1480                        if (tbl->is_SGI) {
1481                                s32 tpt = lq_sta->last_tpt / 100;
1482                                if (tpt >= search_tbl->expected_tpt[idx])
1483                                        break;
1484                        }
1485                        search_tbl->current_rate =
1486                            il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
1487                                                         is_green);
1488                        update_search_tbl_counter = 1;
1489                        goto out;
1490                }
1491                tbl->action++;
1492                if (tbl->action > IL_SISO_SWITCH_GI)
1493                        tbl->action = IL_SISO_SWITCH_ANTENNA1;
1494
1495                if (tbl->action == start_action)
1496                        break;
1497        }
1498        search_tbl->lq_type = LQ_NONE;
1499        return 0;
1500
1501out:
1502        lq_sta->search_better_tbl = 1;
1503        tbl->action++;
1504        if (tbl->action > IL_SISO_SWITCH_GI)
1505                tbl->action = IL_SISO_SWITCH_ANTENNA1;
1506        if (update_search_tbl_counter)
1507                search_tbl->action = tbl->action;
1508
1509        return 0;
1510}
1511
1512/*
1513 * Try to switch to new modulation mode from MIMO2
1514 */
1515static int
1516il4965_rs_move_mimo2_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1517                              struct ieee80211_conf *conf,
1518                              struct ieee80211_sta *sta, int idx)
1519{
1520        s8 is_green = lq_sta->is_green;
1521        struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1522        struct il_scale_tbl_info *search_tbl =
1523            &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1524        struct il_rate_scale_data *win = &(tbl->win[idx]);
1525        struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1526        u32 sz =
1527            (sizeof(struct il_scale_tbl_info) -
1528             (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1529        u8 start_action;
1530        u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1531        u8 tx_chains_num = il->hw_params.tx_chains_num;
1532        u8 update_search_tbl_counter = 0;
1533        int ret;
1534
1535        start_action = tbl->action;
1536        for (;;) {
1537                lq_sta->action_counter++;
1538                switch (tbl->action) {
1539                case IL_MIMO2_SWITCH_ANTENNA1:
1540                case IL_MIMO2_SWITCH_ANTENNA2:
1541                        D_RATE("LQ: MIMO2 toggle Antennas\n");
1542
1543                        if (tx_chains_num <= 2)
1544                                break;
1545
1546                        if (win->success_ratio >= IL_RS_GOOD_RATIO)
1547                                break;
1548
1549                        memcpy(search_tbl, tbl, sz);
1550                        if (il4965_rs_toggle_antenna
1551                            (valid_tx_ant, &search_tbl->current_rate,
1552                             search_tbl)) {
1553                                update_search_tbl_counter = 1;
1554                                goto out;
1555                        }
1556                        break;
1557                case IL_MIMO2_SWITCH_SISO_A:
1558                case IL_MIMO2_SWITCH_SISO_B:
1559                case IL_MIMO2_SWITCH_SISO_C:
1560                        D_RATE("LQ: MIMO2 switch to SISO\n");
1561
1562                        /* Set up new search table for SISO */
1563                        memcpy(search_tbl, tbl, sz);
1564
1565                        if (tbl->action == IL_MIMO2_SWITCH_SISO_A)
1566                                search_tbl->ant_type = ANT_A;
1567                        else if (tbl->action == IL_MIMO2_SWITCH_SISO_B)
1568                                search_tbl->ant_type = ANT_B;
1569                        else
1570                                search_tbl->ant_type = ANT_C;
1571
1572                        if (!il4965_rs_is_valid_ant
1573                            (valid_tx_ant, search_tbl->ant_type))
1574                                break;
1575
1576                        ret =
1577                            il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
1578                                                     search_tbl, idx);
1579                        if (!ret)
1580                                goto out;
1581
1582                        break;
1583
1584                case IL_MIMO2_SWITCH_GI:
1585                        if (!tbl->is_ht40 &&
1586                            !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
1587                                break;
1588                        if (tbl->is_ht40 &&
1589                            !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
1590                                break;
1591
1592                        D_RATE("LQ: MIMO2 toggle SGI/NGI\n");
1593
1594                        /* Set up new search table for MIMO2 */
1595                        memcpy(search_tbl, tbl, sz);
1596                        search_tbl->is_SGI = !tbl->is_SGI;
1597                        il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1598                        /*
1599                         * If active table already uses the fastest possible
1600                         * modulation (dual stream with short guard interval),
1601                         * and it's working well, there's no need to look
1602                         * for a better type of modulation!
1603                         */
1604                        if (tbl->is_SGI) {
1605                                s32 tpt = lq_sta->last_tpt / 100;
1606                                if (tpt >= search_tbl->expected_tpt[idx])
1607                                        break;
1608                        }
1609                        search_tbl->current_rate =
1610                            il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
1611                                                         is_green);
1612                        update_search_tbl_counter = 1;
1613                        goto out;
1614
1615                }
1616                tbl->action++;
1617                if (tbl->action > IL_MIMO2_SWITCH_GI)
1618                        tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
1619
1620                if (tbl->action == start_action)
1621                        break;
1622        }
1623        search_tbl->lq_type = LQ_NONE;
1624        return 0;
1625out:
1626        lq_sta->search_better_tbl = 1;
1627        tbl->action++;
1628        if (tbl->action > IL_MIMO2_SWITCH_GI)
1629                tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
1630        if (update_search_tbl_counter)
1631                search_tbl->action = tbl->action;
1632
1633        return 0;
1634
1635}
1636
1637/*
1638 * Check whether we should continue using same modulation mode, or
1639 * begin search for a new mode, based on:
1640 * 1) # tx successes or failures while using this mode
1641 * 2) # times calling this function
1642 * 3) elapsed time in this mode (not used, for now)
1643 */
1644static void
1645il4965_rs_stay_in_table(struct il_lq_sta *lq_sta, bool force_search)
1646{
1647        struct il_scale_tbl_info *tbl;
1648        int i;
1649        int active_tbl;
1650        int flush_interval_passed = 0;
1651        struct il_priv *il;
1652
1653        il = lq_sta->drv;
1654        active_tbl = lq_sta->active_tbl;
1655
1656        tbl = &(lq_sta->lq_info[active_tbl]);
1657
1658        /* If we've been disallowing search, see if we should now allow it */
1659        if (lq_sta->stay_in_tbl) {
1660
1661                /* Elapsed time using current modulation mode */
1662                if (lq_sta->flush_timer)
1663                        flush_interval_passed =
1664                            time_after(jiffies,
1665                                       (unsigned long)(lq_sta->flush_timer +
1666                                                       RATE_SCALE_FLUSH_INTVL));
1667
1668                /*
1669                 * Check if we should allow search for new modulation mode.
1670                 * If many frames have failed or succeeded, or we've used
1671                 * this same modulation for a long time, allow search, and
1672                 * reset history stats that keep track of whether we should
1673                 * allow a new search.  Also (below) reset all bitmaps and
1674                 * stats in active history.
1675                 */
1676                if (force_search ||
1677                    lq_sta->total_failed > lq_sta->max_failure_limit ||
1678                    lq_sta->total_success > lq_sta->max_success_limit ||
1679                    (!lq_sta->search_better_tbl && lq_sta->flush_timer &&
1680                     flush_interval_passed)) {
1681                        D_RATE("LQ: stay is expired %d %d %d\n",
1682                               lq_sta->total_failed, lq_sta->total_success,
1683                               flush_interval_passed);
1684
1685                        /* Allow search for new mode */
1686                        lq_sta->stay_in_tbl = 0;        /* only place reset */
1687                        lq_sta->total_failed = 0;
1688                        lq_sta->total_success = 0;
1689                        lq_sta->flush_timer = 0;
1690
1691                        /*
1692                         * Else if we've used this modulation mode enough repetitions
1693                         * (regardless of elapsed time or success/failure), reset
1694                         * history bitmaps and rate-specific stats for all rates in
1695                         * active table.
1696                         */
1697                } else {
1698                        lq_sta->table_count++;
1699                        if (lq_sta->table_count >= lq_sta->table_count_limit) {
1700                                lq_sta->table_count = 0;
1701
1702                                D_RATE("LQ: stay in table clear win\n");
1703                                for (i = 0; i < RATE_COUNT; i++)
1704                                        il4965_rs_rate_scale_clear_win(&
1705                                                                       (tbl->
1706                                                                        win
1707                                                                        [i]));
1708                        }
1709                }
1710
1711                /* If transitioning to allow "search", reset all history
1712                 * bitmaps and stats in active table (this will become the new
1713                 * "search" table). */
1714                if (!lq_sta->stay_in_tbl) {
1715                        for (i = 0; i < RATE_COUNT; i++)
1716                                il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
1717                }
1718        }
1719}
1720
1721/*
1722 * setup rate table in uCode
1723 */
1724static void
1725il4965_rs_update_rate_tbl(struct il_priv *il, struct il_lq_sta *lq_sta,
1726                          struct il_scale_tbl_info *tbl, int idx, u8 is_green)
1727{
1728        u32 rate;
1729
1730        /* Update uCode's rate table. */
1731        rate = il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
1732        il4965_rs_fill_link_cmd(il, lq_sta, rate);
1733        il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
1734}
1735
1736/*
1737 * Do rate scaling and search for new modulation mode.
1738 */
1739static void
1740il4965_rs_rate_scale_perform(struct il_priv *il, struct sk_buff *skb,
1741                             struct ieee80211_sta *sta,
1742                             struct il_lq_sta *lq_sta)
1743{
1744        struct ieee80211_hw *hw = il->hw;
1745        struct ieee80211_conf *conf = &hw->conf;
1746        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1747        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1748        int low = RATE_INVALID;
1749        int high = RATE_INVALID;
1750        int idx;
1751        int i;
1752        struct il_rate_scale_data *win = NULL;
1753        int current_tpt = IL_INVALID_VALUE;
1754        int low_tpt = IL_INVALID_VALUE;
1755        int high_tpt = IL_INVALID_VALUE;
1756        u32 fail_count;
1757        s8 scale_action = 0;
1758        u16 rate_mask;
1759        u8 update_lq = 0;
1760        struct il_scale_tbl_info *tbl, *tbl1;
1761        u16 rate_scale_idx_msk = 0;
1762        u8 is_green = 0;
1763        u8 active_tbl = 0;
1764        u8 done_search = 0;
1765        u16 high_low;
1766        s32 sr;
1767        u8 tid = MAX_TID_COUNT;
1768        struct il_tid_data *tid_data;
1769
1770        D_RATE("rate scale calculate new rate for skb\n");
1771
1772        /* Send management frames and NO_ACK data using lowest rate. */
1773        /* TODO: this could probably be improved.. */
1774        if (!ieee80211_is_data(hdr->frame_control) ||
1775            (info->flags & IEEE80211_TX_CTL_NO_ACK))
1776                return;
1777
1778        lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1779
1780        tid = il4965_rs_tl_add_packet(lq_sta, hdr);
1781        if (tid != MAX_TID_COUNT && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1782                tid_data = &il->stations[lq_sta->lq.sta_id].tid[tid];
1783                if (tid_data->agg.state == IL_AGG_OFF)
1784                        lq_sta->is_agg = 0;
1785                else
1786                        lq_sta->is_agg = 1;
1787        } else
1788                lq_sta->is_agg = 0;
1789
1790        /*
1791         * Select rate-scale / modulation-mode table to work with in
1792         * the rest of this function:  "search" if searching for better
1793         * modulation mode, or "active" if doing rate scaling within a mode.
1794         */
1795        if (!lq_sta->search_better_tbl)
1796                active_tbl = lq_sta->active_tbl;
1797        else
1798                active_tbl = 1 - lq_sta->active_tbl;
1799
1800        tbl = &(lq_sta->lq_info[active_tbl]);
1801        if (is_legacy(tbl->lq_type))
1802                lq_sta->is_green = 0;
1803        else
1804                lq_sta->is_green = il4965_rs_use_green(il, sta);
1805        is_green = lq_sta->is_green;
1806
1807        /* current tx rate */
1808        idx = lq_sta->last_txrate_idx;
1809
1810        D_RATE("Rate scale idx %d for type %d\n", idx, tbl->lq_type);
1811
1812        /* rates available for this association, and for modulation mode */
1813        rate_mask = il4965_rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1814
1815        D_RATE("mask 0x%04X\n", rate_mask);
1816
1817        /* mask with station rate restriction */
1818        if (is_legacy(tbl->lq_type)) {
1819                if (lq_sta->band == NL80211_BAND_5GHZ)
1820                        /* supp_rates has no CCK bits in A mode */
1821                        rate_scale_idx_msk =
1822                            (u16) (rate_mask &
1823                                   (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
1824                else
1825                        rate_scale_idx_msk =
1826                            (u16) (rate_mask & lq_sta->supp_rates);
1827
1828        } else
1829                rate_scale_idx_msk = rate_mask;
1830
1831        if (!rate_scale_idx_msk)
1832                rate_scale_idx_msk = rate_mask;
1833
1834        if (!((1 << idx) & rate_scale_idx_msk)) {
1835                IL_ERR("Current Rate is not valid\n");
1836                if (lq_sta->search_better_tbl) {
1837                        /* revert to active table if search table is not valid */
1838                        tbl->lq_type = LQ_NONE;
1839                        lq_sta->search_better_tbl = 0;
1840                        tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1841                        /* get "active" rate info */
1842                        idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
1843                        il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx,
1844                                                      is_green);
1845                }
1846                return;
1847        }
1848
1849        /* Get expected throughput table and history win for current rate */
1850        if (!tbl->expected_tpt) {
1851                IL_ERR("tbl->expected_tpt is NULL\n");
1852                return;
1853        }
1854
1855        /* force user max rate if set by user */
1856        if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < idx) {
1857                idx = lq_sta->max_rate_idx;
1858                update_lq = 1;
1859                win = &(tbl->win[idx]);
1860                goto lq_update;
1861        }
1862
1863        win = &(tbl->win[idx]);
1864
1865        /*
1866         * If there is not enough history to calculate actual average
1867         * throughput, keep analyzing results of more tx frames, without
1868         * changing rate or mode (bypass most of the rest of this function).
1869         * Set up new rate table in uCode only if old rate is not supported
1870         * in current association (use new rate found above).
1871         */
1872        fail_count = win->counter - win->success_counter;
1873        if (fail_count < RATE_MIN_FAILURE_TH &&
1874            win->success_counter < RATE_MIN_SUCCESS_TH) {
1875                D_RATE("LQ: still below TH. succ=%d total=%d " "for idx %d\n",
1876                       win->success_counter, win->counter, idx);
1877
1878                /* Can't calculate this yet; not enough history */
1879                win->average_tpt = IL_INVALID_VALUE;
1880
1881                /* Should we stay with this modulation mode,
1882                 * or search for a new one? */
1883                il4965_rs_stay_in_table(lq_sta, false);
1884
1885                goto out;
1886        }
1887        /* Else we have enough samples; calculate estimate of
1888         * actual average throughput */
1889        if (win->average_tpt !=
1890            ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128)) {
1891                IL_ERR("expected_tpt should have been calculated by now\n");
1892                win->average_tpt =
1893                    ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128);
1894        }
1895
1896        /* If we are searching for better modulation mode, check success. */
1897        if (lq_sta->search_better_tbl) {
1898                /* If good success, continue using the "search" mode;
1899                 * no need to send new link quality command, since we're
1900                 * continuing to use the setup that we've been trying. */
1901                if (win->average_tpt > lq_sta->last_tpt) {
1902
1903                        D_RATE("LQ: SWITCHING TO NEW TBL "
1904                               "suc=%d cur-tpt=%d old-tpt=%d\n",
1905                               win->success_ratio, win->average_tpt,
1906                               lq_sta->last_tpt);
1907
1908                        if (!is_legacy(tbl->lq_type))
1909                                lq_sta->enable_counter = 1;
1910
1911                        /* Swap tables; "search" becomes "active" */
1912                        lq_sta->active_tbl = active_tbl;
1913                        current_tpt = win->average_tpt;
1914
1915                        /* Else poor success; go back to mode in "active" table */
1916                } else {
1917
1918                        D_RATE("LQ: GOING BACK TO THE OLD TBL "
1919                               "suc=%d cur-tpt=%d old-tpt=%d\n",
1920                               win->success_ratio, win->average_tpt,
1921                               lq_sta->last_tpt);
1922
1923                        /* Nullify "search" table */
1924                        tbl->lq_type = LQ_NONE;
1925
1926                        /* Revert to "active" table */
1927                        active_tbl = lq_sta->active_tbl;
1928                        tbl = &(lq_sta->lq_info[active_tbl]);
1929
1930                        /* Revert to "active" rate and throughput info */
1931                        idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
1932                        current_tpt = lq_sta->last_tpt;
1933
1934                        /* Need to set up a new rate table in uCode */
1935                        update_lq = 1;
1936                }
1937
1938                /* Either way, we've made a decision; modulation mode
1939                 * search is done, allow rate adjustment next time. */
1940                lq_sta->search_better_tbl = 0;
1941                done_search = 1;        /* Don't switch modes below! */
1942                goto lq_update;
1943        }
1944
1945        /* (Else) not in search of better modulation mode, try for better
1946         * starting rate, while staying in this mode. */
1947        high_low =
1948            il4965_rs_get_adjacent_rate(il, idx, rate_scale_idx_msk,
1949                                        tbl->lq_type);
1950        low = high_low & 0xff;
1951        high = (high_low >> 8) & 0xff;
1952
1953        /* If user set max rate, dont allow higher than user constrain */
1954        if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < high)
1955                high = RATE_INVALID;
1956
1957        sr = win->success_ratio;
1958
1959        /* Collect measured throughputs for current and adjacent rates */
1960        current_tpt = win->average_tpt;
1961        if (low != RATE_INVALID)
1962                low_tpt = tbl->win[low].average_tpt;
1963        if (high != RATE_INVALID)
1964                high_tpt = tbl->win[high].average_tpt;
1965
1966        scale_action = 0;
1967
1968        /* Too many failures, decrease rate */
1969        if (sr <= RATE_DECREASE_TH || current_tpt == 0) {
1970                D_RATE("decrease rate because of low success_ratio\n");
1971                scale_action = -1;
1972
1973                /* No throughput measured yet for adjacent rates; try increase. */
1974        } else if (low_tpt == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) {
1975
1976                if (high != RATE_INVALID && sr >= RATE_INCREASE_TH)
1977                        scale_action = 1;
1978                else if (low != RATE_INVALID)
1979                        scale_action = 0;
1980        }
1981
1982        /* Both adjacent throughputs are measured, but neither one has better
1983         * throughput; we're using the best rate, don't change it! */
1984        else if (low_tpt != IL_INVALID_VALUE && high_tpt != IL_INVALID_VALUE &&
1985                 low_tpt < current_tpt && high_tpt < current_tpt)
1986                scale_action = 0;
1987
1988        /* At least one adjacent rate's throughput is measured,
1989         * and may have better performance. */
1990        else {
1991                /* Higher adjacent rate's throughput is measured */
1992                if (high_tpt != IL_INVALID_VALUE) {
1993                        /* Higher rate has better throughput */
1994                        if (high_tpt > current_tpt && sr >= RATE_INCREASE_TH)
1995                                scale_action = 1;
1996                        else
1997                                scale_action = 0;
1998
1999                        /* Lower adjacent rate's throughput is measured */
2000                } else if (low_tpt != IL_INVALID_VALUE) {
2001                        /* Lower rate has better throughput */
2002                        if (low_tpt > current_tpt) {
2003                                D_RATE("decrease rate because of low tpt\n");
2004                                scale_action = -1;
2005                        } else if (sr >= RATE_INCREASE_TH) {
2006                                scale_action = 1;
2007                        }
2008                }
2009        }
2010
2011        /* Sanity check; asked for decrease, but success rate or throughput
2012         * has been good at old rate.  Don't change it. */
2013        if (scale_action == -1 && low != RATE_INVALID &&
2014            (sr > RATE_HIGH_TH || current_tpt > 100 * tbl->expected_tpt[low]))
2015                scale_action = 0;
2016
2017        switch (scale_action) {
2018        case -1:
2019                /* Decrease starting rate, update uCode's rate table */
2020                if (low != RATE_INVALID) {
2021                        update_lq = 1;
2022                        idx = low;
2023                }
2024
2025                break;
2026        case 1:
2027                /* Increase starting rate, update uCode's rate table */
2028                if (high != RATE_INVALID) {
2029                        update_lq = 1;
2030                        idx = high;
2031                }
2032
2033                break;
2034        case 0:
2035                /* No change */
2036        default:
2037                break;
2038        }
2039
2040        D_RATE("choose rate scale idx %d action %d low %d " "high %d type %d\n",
2041               idx, scale_action, low, high, tbl->lq_type);
2042
2043lq_update:
2044        /* Replace uCode's rate table for the destination station. */
2045        if (update_lq)
2046                il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx, is_green);
2047
2048        /* Should we stay with this modulation mode,
2049         * or search for a new one? */
2050        il4965_rs_stay_in_table(lq_sta, false);
2051
2052        /*
2053         * Search for new modulation mode if we're:
2054         * 1)  Not changing rates right now
2055         * 2)  Not just finishing up a search
2056         * 3)  Allowing a new search
2057         */
2058        if (!update_lq && !done_search && !lq_sta->stay_in_tbl && win->counter) {
2059                /* Save current throughput to compare with "search" throughput */
2060                lq_sta->last_tpt = current_tpt;
2061
2062                /* Select a new "search" modulation mode to try.
2063                 * If one is found, set up the new "search" table. */
2064                if (is_legacy(tbl->lq_type))
2065                        il4965_rs_move_legacy_other(il, lq_sta, conf, sta, idx);
2066                else if (is_siso(tbl->lq_type))
2067                        il4965_rs_move_siso_to_other(il, lq_sta, conf, sta,
2068                                                     idx);
2069                else            /* (is_mimo2(tbl->lq_type)) */
2070                        il4965_rs_move_mimo2_to_other(il, lq_sta, conf, sta,
2071                                                      idx);
2072
2073                /* If new "search" mode was selected, set up in uCode table */
2074                if (lq_sta->search_better_tbl) {
2075                        /* Access the "search" table, clear its history. */
2076                        tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2077                        for (i = 0; i < RATE_COUNT; i++)
2078                                il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
2079
2080                        /* Use new "search" start rate */
2081                        idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
2082
2083                        D_RATE("Switch current  mcs: %X idx: %d\n",
2084                               tbl->current_rate, idx);
2085                        il4965_rs_fill_link_cmd(il, lq_sta, tbl->current_rate);
2086                        il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
2087                } else
2088                        done_search = 1;
2089        }
2090
2091        if (done_search && !lq_sta->stay_in_tbl) {
2092                /* If the "active" (non-search) mode was legacy,
2093                 * and we've tried switching antennas,
2094                 * but we haven't been able to try HT modes (not available),
2095                 * stay with best antenna legacy modulation for a while
2096                 * before next round of mode comparisons. */
2097                tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2098                if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2099                    lq_sta->action_counter > tbl1->max_search) {
2100                        D_RATE("LQ: STAY in legacy table\n");
2101                        il4965_rs_set_stay_in_table(il, 1, lq_sta);
2102                }
2103
2104                /* If we're in an HT mode, and all 3 mode switch actions
2105                 * have been tried and compared, stay in this best modulation
2106                 * mode for a while before next round of mode comparisons. */
2107                if (lq_sta->enable_counter &&
2108                    lq_sta->action_counter >= tbl1->max_search) {
2109                        if (lq_sta->last_tpt > IL_AGG_TPT_THREHOLD &&
2110                            (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2111                            tid != MAX_TID_COUNT) {
2112                                tid_data =
2113                                    &il->stations[lq_sta->lq.sta_id].tid[tid];
2114                                if (tid_data->agg.state == IL_AGG_OFF) {
2115                                        D_RATE("try to aggregate tid %d\n",
2116                                               tid);
2117                                        il4965_rs_tl_turn_on_agg(il, tid,
2118                                                                 lq_sta, sta);
2119                                }
2120                        }
2121                        il4965_rs_set_stay_in_table(il, 0, lq_sta);
2122                }
2123        }
2124
2125out:
2126        tbl->current_rate =
2127            il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
2128        i = idx;
2129        lq_sta->last_txrate_idx = i;
2130}
2131
2132/**
2133 * il4965_rs_initialize_lq - Initialize a station's hardware rate table
2134 *
2135 * The uCode's station table contains a table of fallback rates
2136 * for automatic fallback during transmission.
2137 *
2138 * NOTE: This sets up a default set of values.  These will be replaced later
2139 *       if the driver's iwl-4965-rs rate scaling algorithm is used, instead of
2140 *       rc80211_simple.
2141 *
2142 * NOTE: Run C_ADD_STA command to set up station table entry, before
2143 *       calling this function (which runs C_TX_LINK_QUALITY_CMD,
2144 *       which requires station table entry to exist).
2145 */
2146static void
2147il4965_rs_initialize_lq(struct il_priv *il, struct ieee80211_conf *conf,
2148                        struct ieee80211_sta *sta, struct il_lq_sta *lq_sta)
2149{
2150        struct il_scale_tbl_info *tbl;
2151        int rate_idx;
2152        int i;
2153        u32 rate;
2154        u8 use_green;
2155        u8 active_tbl = 0;
2156        u8 valid_tx_ant;
2157
2158        if (!sta || !lq_sta)
2159                return;
2160
2161        use_green = il4965_rs_use_green(il, sta);
2162
2163        i = lq_sta->last_txrate_idx;
2164
2165        valid_tx_ant = il->hw_params.valid_tx_ant;
2166
2167        if (!lq_sta->search_better_tbl)
2168                active_tbl = lq_sta->active_tbl;
2169        else
2170                active_tbl = 1 - lq_sta->active_tbl;
2171
2172        tbl = &(lq_sta->lq_info[active_tbl]);
2173
2174        if (i < 0 || i >= RATE_COUNT)
2175                i = 0;
2176
2177        rate = il_rates[i].plcp;
2178        tbl->ant_type = il4965_first_antenna(valid_tx_ant);
2179        rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2180
2181        if (i >= IL_FIRST_CCK_RATE && i <= IL_LAST_CCK_RATE)
2182                rate |= RATE_MCS_CCK_MSK;
2183
2184        il4965_rs_get_tbl_info_from_mcs(rate, il->band, tbl, &rate_idx);
2185        if (!il4965_rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2186                il4965_rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2187
2188        rate = il4965_rate_n_flags_from_tbl(il, tbl, rate_idx, use_green);
2189        tbl->current_rate = rate;
2190        il4965_rs_set_expected_tpt_table(lq_sta, tbl);
2191        il4965_rs_fill_link_cmd(NULL, lq_sta, rate);
2192        il->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2193        il_send_lq_cmd(il, &lq_sta->lq, CMD_SYNC, true);
2194}
2195
2196static void
2197il4965_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta,
2198                   struct ieee80211_tx_rate_control *txrc)
2199{
2200
2201        struct sk_buff *skb = txrc->skb;
2202        struct ieee80211_supported_band *sband = txrc->sband;
2203        struct il_priv *il __maybe_unused = (struct il_priv *)il_r;
2204        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2205        struct il_lq_sta *lq_sta = il_sta;
2206        int rate_idx;
2207
2208        D_RATE("rate scale calculate new rate for skb\n");
2209
2210        /* Get max rate if user set max rate */
2211        if (lq_sta) {
2212                lq_sta->max_rate_idx = fls(txrc->rate_idx_mask) - 1;
2213                if (sband->band == NL80211_BAND_5GHZ &&
2214                    lq_sta->max_rate_idx != -1)
2215                        lq_sta->max_rate_idx += IL_FIRST_OFDM_RATE;
2216                if (lq_sta->max_rate_idx < 0 ||
2217                    lq_sta->max_rate_idx >= RATE_COUNT)
2218                        lq_sta->max_rate_idx = -1;
2219        }
2220
2221        /* Treat uninitialized rate scaling data same as non-existing. */
2222        if (lq_sta && !lq_sta->drv) {
2223                D_RATE("Rate scaling not initialized yet.\n");
2224                il_sta = NULL;
2225        }
2226
2227        /* Send management frames and NO_ACK data using lowest rate. */
2228        if (rate_control_send_low(sta, il_sta, txrc))
2229                return;
2230
2231        if (!lq_sta)
2232                return;
2233
2234        rate_idx = lq_sta->last_txrate_idx;
2235
2236        if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2237                rate_idx -= IL_FIRST_OFDM_RATE;
2238                /* 6M and 9M shared same MCS idx */
2239                rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2240                if (il4965_rs_extract_rate(lq_sta->last_rate_n_flags) >=
2241                    RATE_MIMO2_6M_PLCP)
2242                        rate_idx = rate_idx + MCS_IDX_PER_STREAM;
2243                info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2244                if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2245                        info->control.rates[0].flags |=
2246                            IEEE80211_TX_RC_SHORT_GI;
2247                if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2248                        info->control.rates[0].flags |=
2249                            IEEE80211_TX_RC_DUP_DATA;
2250                if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2251                        info->control.rates[0].flags |=
2252                            IEEE80211_TX_RC_40_MHZ_WIDTH;
2253                if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2254                        info->control.rates[0].flags |=
2255                            IEEE80211_TX_RC_GREEN_FIELD;
2256        } else {
2257                /* Check for invalid rates */
2258                if (rate_idx < 0 || rate_idx >= RATE_COUNT_LEGACY ||
2259                    (sband->band == NL80211_BAND_5GHZ &&
2260                     rate_idx < IL_FIRST_OFDM_RATE))
2261                        rate_idx = rate_lowest_index(sband, sta);
2262                /* On valid 5 GHz rate, adjust idx */
2263                else if (sband->band == NL80211_BAND_5GHZ)
2264                        rate_idx -= IL_FIRST_OFDM_RATE;
2265                info->control.rates[0].flags = 0;
2266        }
2267        info->control.rates[0].idx = rate_idx;
2268        info->control.rates[0].count = 1;
2269}
2270
2271static void *
2272il4965_rs_alloc_sta(void *il_rate, struct ieee80211_sta *sta, gfp_t gfp)
2273{
2274        struct il_station_priv *sta_priv =
2275            (struct il_station_priv *)sta->drv_priv;
2276        struct il_priv *il;
2277
2278        il = (struct il_priv *)il_rate;
2279        D_RATE("create station rate scale win\n");
2280
2281        return &sta_priv->lq_sta;
2282}
2283
2284/*
2285 * Called after adding a new station to initialize rate scaling
2286 */
2287void
2288il4965_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id)
2289{
2290        int i, j;
2291        struct ieee80211_hw *hw = il->hw;
2292        struct ieee80211_conf *conf = &il->hw->conf;
2293        struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2294        struct il_station_priv *sta_priv;
2295        struct il_lq_sta *lq_sta;
2296        struct ieee80211_supported_band *sband;
2297
2298        sta_priv = (struct il_station_priv *)sta->drv_priv;
2299        lq_sta = &sta_priv->lq_sta;
2300        sband = hw->wiphy->bands[conf->chandef.chan->band];
2301
2302        lq_sta->lq.sta_id = sta_id;
2303
2304        for (j = 0; j < LQ_SIZE; j++)
2305                for (i = 0; i < RATE_COUNT; i++)
2306                        il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
2307                                                       win[i]);
2308
2309        lq_sta->flush_timer = 0;
2310        lq_sta->supp_rates = sta->supp_rates[sband->band];
2311        for (j = 0; j < LQ_SIZE; j++)
2312                for (i = 0; i < RATE_COUNT; i++)
2313                        il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
2314                                                       win[i]);
2315
2316        D_RATE("LQ:" "*** rate scale station global init for station %d ***\n",
2317               sta_id);
2318        /* TODO: what is a good starting rate for STA? About middle? Maybe not
2319         * the lowest or the highest rate.. Could consider using RSSI from
2320         * previous packets? Need to have IEEE 802.1X auth succeed immediately
2321         * after assoc.. */
2322
2323        lq_sta->is_dup = 0;
2324        lq_sta->max_rate_idx = -1;
2325        lq_sta->missed_rate_counter = IL_MISSED_RATE_MAX;
2326        lq_sta->is_green = il4965_rs_use_green(il, sta);
2327        lq_sta->active_legacy_rate = il->active_rate & ~(0x1000);
2328        lq_sta->band = il->band;
2329        /*
2330         * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2331         * supp_rates[] does not; shift to convert format, force 9 MBits off.
2332         */
2333        lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2334        lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2335        lq_sta->active_siso_rate &= ~((u16) 0x2);
2336        lq_sta->active_siso_rate <<= IL_FIRST_OFDM_RATE;
2337
2338        /* Same here */
2339        lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2340        lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2341        lq_sta->active_mimo2_rate &= ~((u16) 0x2);
2342        lq_sta->active_mimo2_rate <<= IL_FIRST_OFDM_RATE;
2343
2344        /* These values will be overridden later */
2345        lq_sta->lq.general_params.single_stream_ant_msk =
2346            il4965_first_antenna(il->hw_params.valid_tx_ant);
2347        lq_sta->lq.general_params.dual_stream_ant_msk =
2348            il->hw_params.valid_tx_ant & ~il4965_first_antenna(il->hw_params.
2349                                                               valid_tx_ant);
2350        if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2351                lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2352        } else if (il4965_num_of_ant(il->hw_params.valid_tx_ant) == 2) {
2353                lq_sta->lq.general_params.dual_stream_ant_msk =
2354                    il->hw_params.valid_tx_ant;
2355        }
2356
2357        /* as default allow aggregation for all tids */
2358        lq_sta->tx_agg_tid_en = IL_AGG_ALL_TID;
2359        lq_sta->drv = il;
2360
2361        /* Set last_txrate_idx to lowest rate */
2362        lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2363        if (sband->band == NL80211_BAND_5GHZ)
2364                lq_sta->last_txrate_idx += IL_FIRST_OFDM_RATE;
2365        lq_sta->is_agg = 0;
2366
2367#ifdef CONFIG_MAC80211_DEBUGFS
2368        lq_sta->dbg_fixed_rate = 0;
2369#endif
2370
2371        il4965_rs_initialize_lq(il, conf, sta, lq_sta);
2372}
2373
2374static void
2375il4965_rs_fill_link_cmd(struct il_priv *il, struct il_lq_sta *lq_sta,
2376                        u32 new_rate)
2377{
2378        struct il_scale_tbl_info tbl_type;
2379        int idx = 0;
2380        int rate_idx;
2381        int repeat_rate = 0;
2382        u8 ant_toggle_cnt = 0;
2383        u8 use_ht_possible = 1;
2384        u8 valid_tx_ant = 0;
2385        struct il_link_quality_cmd *lq_cmd = &lq_sta->lq;
2386
2387        /* Override starting rate (idx 0) if needed for debug purposes */
2388        il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2389
2390        /* Interpret new_rate (rate_n_flags) */
2391        il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2392                                        &rate_idx);
2393
2394        /* How many times should we repeat the initial rate? */
2395        if (is_legacy(tbl_type.lq_type)) {
2396                ant_toggle_cnt = 1;
2397                repeat_rate = IL_NUMBER_TRY;
2398        } else {
2399                repeat_rate = IL_HT_NUMBER_TRY;
2400        }
2401
2402        lq_cmd->general_params.mimo_delimiter =
2403            is_mimo(tbl_type.lq_type) ? 1 : 0;
2404
2405        /* Fill 1st table entry (idx 0) */
2406        lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
2407
2408        if (il4965_num_of_ant(tbl_type.ant_type) == 1) {
2409                lq_cmd->general_params.single_stream_ant_msk =
2410                    tbl_type.ant_type;
2411        } else if (il4965_num_of_ant(tbl_type.ant_type) == 2) {
2412                lq_cmd->general_params.dual_stream_ant_msk = tbl_type.ant_type;
2413        }
2414        /* otherwise we don't modify the existing value */
2415        idx++;
2416        repeat_rate--;
2417        if (il)
2418                valid_tx_ant = il->hw_params.valid_tx_ant;
2419
2420        /* Fill rest of rate table */
2421        while (idx < LINK_QUAL_MAX_RETRY_NUM) {
2422                /* Repeat initial/next rate.
2423                 * For legacy IL_NUMBER_TRY == 1, this loop will not execute.
2424                 * For HT IL_HT_NUMBER_TRY == 3, this executes twice. */
2425                while (repeat_rate > 0 && idx < LINK_QUAL_MAX_RETRY_NUM) {
2426                        if (is_legacy(tbl_type.lq_type)) {
2427                                if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2428                                        ant_toggle_cnt++;
2429                                else if (il &&
2430                                         il4965_rs_toggle_antenna(valid_tx_ant,
2431                                                                  &new_rate,
2432                                                                  &tbl_type))
2433                                        ant_toggle_cnt = 1;
2434                        }
2435
2436                        /* Override next rate if needed for debug purposes */
2437                        il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2438
2439                        /* Fill next table entry */
2440                        lq_cmd->rs_table[idx].rate_n_flags =
2441                            cpu_to_le32(new_rate);
2442                        repeat_rate--;
2443                        idx++;
2444                }
2445
2446                il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2447                                                &tbl_type, &rate_idx);
2448
2449                /* Indicate to uCode which entries might be MIMO.
2450                 * If initial rate was MIMO, this will finally end up
2451                 * as (IL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2452                if (is_mimo(tbl_type.lq_type))
2453                        lq_cmd->general_params.mimo_delimiter = idx;
2454
2455                /* Get next rate */
2456                new_rate =
2457                    il4965_rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2458                                             use_ht_possible);
2459
2460                /* How many times should we repeat the next rate? */
2461                if (is_legacy(tbl_type.lq_type)) {
2462                        if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2463                                ant_toggle_cnt++;
2464                        else if (il &&
2465                                 il4965_rs_toggle_antenna(valid_tx_ant,
2466                                                          &new_rate, &tbl_type))
2467                                ant_toggle_cnt = 1;
2468
2469                        repeat_rate = IL_NUMBER_TRY;
2470                } else {
2471                        repeat_rate = IL_HT_NUMBER_TRY;
2472                }
2473
2474                /* Don't allow HT rates after next pass.
2475                 * il4965_rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2476                use_ht_possible = 0;
2477
2478                /* Override next rate if needed for debug purposes */
2479                il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2480
2481                /* Fill next table entry */
2482                lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
2483
2484                idx++;
2485                repeat_rate--;
2486        }
2487
2488        lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2489        lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2490
2491        lq_cmd->agg_params.agg_time_limit =
2492            cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2493}
2494
2495static void *
2496il4965_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2497{
2498        return hw->priv;
2499}
2500
2501/* rate scale requires free function to be implemented */
2502static void
2503il4965_rs_free(void *il_rate)
2504{
2505        return;
2506}
2507
2508static void
2509il4965_rs_free_sta(void *il_r, struct ieee80211_sta *sta, void *il_sta)
2510{
2511        struct il_priv *il __maybe_unused = il_r;
2512
2513        D_RATE("enter\n");
2514        D_RATE("leave\n");
2515}
2516
2517#ifdef CONFIG_MAC80211_DEBUGFS
2518
2519static void
2520il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
2521{
2522        struct il_priv *il;
2523        u8 valid_tx_ant;
2524        u8 ant_sel_tx;
2525
2526        il = lq_sta->drv;
2527        valid_tx_ant = il->hw_params.valid_tx_ant;
2528        if (lq_sta->dbg_fixed_rate) {
2529                ant_sel_tx =
2530                    ((lq_sta->
2531                      dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) >>
2532                     RATE_MCS_ANT_POS);
2533                if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2534                        *rate_n_flags = lq_sta->dbg_fixed_rate;
2535                        D_RATE("Fixed rate ON\n");
2536                } else {
2537                        lq_sta->dbg_fixed_rate = 0;
2538                        IL_ERR
2539                            ("Invalid antenna selection 0x%X, Valid is 0x%X\n",
2540                             ant_sel_tx, valid_tx_ant);
2541                        D_RATE("Fixed rate OFF\n");
2542                }
2543        } else {
2544                D_RATE("Fixed rate OFF\n");
2545        }
2546}
2547
2548static ssize_t
2549il4965_rs_sta_dbgfs_scale_table_write(struct file *file,
2550                                      const char __user *user_buf,
2551                                      size_t count, loff_t *ppos)
2552{
2553        struct il_lq_sta *lq_sta = file->private_data;
2554        struct il_priv *il;
2555        char buf[64];
2556        size_t buf_size;
2557        u32 parsed_rate;
2558
2559        il = lq_sta->drv;
2560        memset(buf, 0, sizeof(buf));
2561        buf_size = min(count, sizeof(buf) - 1);
2562        if (copy_from_user(buf, user_buf, buf_size))
2563                return -EFAULT;
2564
2565        if (sscanf(buf, "%x", &parsed_rate) == 1)
2566                lq_sta->dbg_fixed_rate = parsed_rate;
2567        else
2568                lq_sta->dbg_fixed_rate = 0;
2569
2570        lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2571        lq_sta->active_siso_rate = 0x1FD0;      /* 6 - 60 MBits, no 9, no CCK */
2572        lq_sta->active_mimo2_rate = 0x1FD0;     /* 6 - 60 MBits, no 9, no CCK */
2573
2574        D_RATE("sta_id %d rate 0x%X\n", lq_sta->lq.sta_id,
2575               lq_sta->dbg_fixed_rate);
2576
2577        if (lq_sta->dbg_fixed_rate) {
2578                il4965_rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2579                il_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
2580        }
2581
2582        return count;
2583}
2584
2585static ssize_t
2586il4965_rs_sta_dbgfs_scale_table_read(struct file *file, char __user *user_buf,
2587                                     size_t count, loff_t *ppos)
2588{
2589        char *buff;
2590        int desc = 0;
2591        int i = 0;
2592        int idx = 0;
2593        ssize_t ret;
2594
2595        struct il_lq_sta *lq_sta = file->private_data;
2596        struct il_priv *il;
2597        struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2598
2599        il = lq_sta->drv;
2600        buff = kmalloc(1024, GFP_KERNEL);
2601        if (!buff)
2602                return -ENOMEM;
2603
2604        desc += sprintf(buff + desc, "sta_id %d\n", lq_sta->lq.sta_id);
2605        desc +=
2606            sprintf(buff + desc, "failed=%d success=%d rate=0%X\n",
2607                    lq_sta->total_failed, lq_sta->total_success,
2608                    lq_sta->active_legacy_rate);
2609        desc +=
2610            sprintf(buff + desc, "fixed rate 0x%X\n", lq_sta->dbg_fixed_rate);
2611        desc +=
2612            sprintf(buff + desc, "valid_tx_ant %s%s%s\n",
2613                    (il->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2614                    (il->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2615                    (il->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2616        desc +=
2617            sprintf(buff + desc, "lq type %s\n",
2618                    (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2619        if (is_Ht(tbl->lq_type)) {
2620                desc +=
2621                    sprintf(buff + desc, " %s",
2622                            (is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");
2623                desc +=
2624                    sprintf(buff + desc, " %s",
2625                            (tbl->is_ht40) ? "40MHz" : "20MHz");
2626                desc +=
2627                    sprintf(buff + desc, " %s %s %s\n",
2628                            (tbl->is_SGI) ? "SGI" : "",
2629                            (lq_sta->is_green) ? "GF enabled" : "",
2630                            (lq_sta->is_agg) ? "AGG on" : "");
2631        }
2632        desc +=
2633            sprintf(buff + desc, "last tx rate=0x%X\n",
2634                    lq_sta->last_rate_n_flags);
2635        desc +=
2636            sprintf(buff + desc,
2637                    "general:" "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2638                    lq_sta->lq.general_params.flags,
2639                    lq_sta->lq.general_params.mimo_delimiter,
2640                    lq_sta->lq.general_params.single_stream_ant_msk,
2641                    lq_sta->lq.general_params.dual_stream_ant_msk);
2642
2643        desc +=
2644            sprintf(buff + desc,
2645                    "agg:"
2646                    "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2647                    le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2648                    lq_sta->lq.agg_params.agg_dis_start_th,
2649                    lq_sta->lq.agg_params.agg_frame_cnt_limit);
2650
2651        desc +=
2652            sprintf(buff + desc,
2653                    "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2654                    lq_sta->lq.general_params.start_rate_idx[0],
2655                    lq_sta->lq.general_params.start_rate_idx[1],
2656                    lq_sta->lq.general_params.start_rate_idx[2],
2657                    lq_sta->lq.general_params.start_rate_idx[3]);
2658
2659        for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2660                idx =
2661                    il4965_hwrate_to_plcp_idx(le32_to_cpu
2662                                              (lq_sta->lq.rs_table[i].
2663                                               rate_n_flags));
2664                if (is_legacy(tbl->lq_type)) {
2665                        desc +=
2666                            sprintf(buff + desc, " rate[%d] 0x%X %smbps\n", i,
2667                                    le32_to_cpu(lq_sta->lq.rs_table[i].
2668                                                rate_n_flags),
2669                                    il_rate_mcs[idx].mbps);
2670                } else {
2671                        desc +=
2672                            sprintf(buff + desc, " rate[%d] 0x%X %smbps (%s)\n",
2673                                    i,
2674                                    le32_to_cpu(lq_sta->lq.rs_table[i].
2675                                                rate_n_flags),
2676                                    il_rate_mcs[idx].mbps,
2677                                    il_rate_mcs[idx].mcs);
2678                }
2679        }
2680
2681        ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2682        kfree(buff);
2683        return ret;
2684}
2685
2686static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2687        .write = il4965_rs_sta_dbgfs_scale_table_write,
2688        .read = il4965_rs_sta_dbgfs_scale_table_read,
2689        .open = simple_open,
2690        .llseek = default_llseek,
2691};
2692
2693static ssize_t
2694il4965_rs_sta_dbgfs_stats_table_read(struct file *file, char __user *user_buf,
2695                                     size_t count, loff_t *ppos)
2696{
2697        char *buff;
2698        int desc = 0;
2699        int i, j;
2700        ssize_t ret;
2701
2702        struct il_lq_sta *lq_sta = file->private_data;
2703
2704        buff = kmalloc(1024, GFP_KERNEL);
2705        if (!buff)
2706                return -ENOMEM;
2707
2708        for (i = 0; i < LQ_SIZE; i++) {
2709                desc +=
2710                    sprintf(buff + desc,
2711                            "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2712                            "rate=0x%X\n", lq_sta->active_tbl == i ? "*" : "x",
2713                            lq_sta->lq_info[i].lq_type,
2714                            lq_sta->lq_info[i].is_SGI,
2715                            lq_sta->lq_info[i].is_ht40,
2716                            lq_sta->lq_info[i].is_dup, lq_sta->is_green,
2717                            lq_sta->lq_info[i].current_rate);
2718                for (j = 0; j < RATE_COUNT; j++) {
2719                        desc +=
2720                            sprintf(buff + desc,
2721                                    "counter=%d success=%d %%=%d\n",
2722                                    lq_sta->lq_info[i].win[j].counter,
2723                                    lq_sta->lq_info[i].win[j].success_counter,
2724                                    lq_sta->lq_info[i].win[j].success_ratio);
2725                }
2726        }
2727        ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2728        kfree(buff);
2729        return ret;
2730}
2731
2732static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2733        .read = il4965_rs_sta_dbgfs_stats_table_read,
2734        .open = simple_open,
2735        .llseek = default_llseek,
2736};
2737
2738static ssize_t
2739il4965_rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2740                                         char __user *user_buf, size_t count,
2741                                         loff_t *ppos)
2742{
2743        char buff[120];
2744        int desc = 0;
2745        struct il_lq_sta *lq_sta = file->private_data;
2746        struct il_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2747
2748        if (is_Ht(tbl->lq_type))
2749                desc +=
2750                    sprintf(buff + desc, "Bit Rate= %d Mb/s\n",
2751                            tbl->expected_tpt[lq_sta->last_txrate_idx]);
2752        else
2753                desc +=
2754                    sprintf(buff + desc, "Bit Rate= %d Mb/s\n",
2755                            il_rates[lq_sta->last_txrate_idx].ieee >> 1);
2756
2757        return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2758}
2759
2760static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2761        .read = il4965_rs_sta_dbgfs_rate_scale_data_read,
2762        .open = simple_open,
2763        .llseek = default_llseek,
2764};
2765
2766static void
2767il4965_rs_add_debugfs(void *il, void *il_sta, struct dentry *dir)
2768{
2769        struct il_lq_sta *lq_sta = il_sta;
2770        lq_sta->rs_sta_dbgfs_scale_table_file =
2771            debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2772                                lq_sta, &rs_sta_dbgfs_scale_table_ops);
2773        lq_sta->rs_sta_dbgfs_stats_table_file =
2774            debugfs_create_file("rate_stats_table", S_IRUSR, dir, lq_sta,
2775                                &rs_sta_dbgfs_stats_table_ops);
2776        lq_sta->rs_sta_dbgfs_rate_scale_data_file =
2777            debugfs_create_file("rate_scale_data", S_IRUSR, dir, lq_sta,
2778                                &rs_sta_dbgfs_rate_scale_data_ops);
2779        lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2780            debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2781                              &lq_sta->tx_agg_tid_en);
2782
2783}
2784
2785static void
2786il4965_rs_remove_debugfs(void *il, void *il_sta)
2787{
2788        struct il_lq_sta *lq_sta = il_sta;
2789        debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2790        debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2791        debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
2792        debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2793}
2794#endif
2795
2796/*
2797 * Initialization of rate scaling information is done by driver after
2798 * the station is added. Since mac80211 calls this function before a
2799 * station is added we ignore it.
2800 */
2801static void
2802il4965_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband,
2803                         struct cfg80211_chan_def *chandef,
2804                         struct ieee80211_sta *sta, void *il_sta)
2805{
2806}
2807
2808static const struct rate_control_ops rs_4965_ops = {
2809        .name = IL4965_RS_NAME,
2810        .tx_status = il4965_rs_tx_status,
2811        .get_rate = il4965_rs_get_rate,
2812        .rate_init = il4965_rs_rate_init_stub,
2813        .alloc = il4965_rs_alloc,
2814        .free = il4965_rs_free,
2815        .alloc_sta = il4965_rs_alloc_sta,
2816        .free_sta = il4965_rs_free_sta,
2817#ifdef CONFIG_MAC80211_DEBUGFS
2818        .add_sta_debugfs = il4965_rs_add_debugfs,
2819        .remove_sta_debugfs = il4965_rs_remove_debugfs,
2820#endif
2821};
2822
2823int
2824il4965_rate_control_register(void)
2825{
2826        return ieee80211_rate_control_register(&rs_4965_ops);
2827}
2828
2829void
2830il4965_rate_control_unregister(void)
2831{
2832        ieee80211_rate_control_unregister(&rs_4965_ops);
2833}
2834