2800 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/******************************************************************************3 *4 * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.5 *6 * Contact Information:7 * Intel Linux Wireless <ilw@linux.intel.com>8 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-64979 *10 *****************************************************************************/11#include <linux/kernel.h>12#include <linux/skbuff.h>13#include <linux/slab.h>14#include <net/mac80211.h>15 16#include <linux/netdevice.h>17#include <linux/etherdevice.h>18#include <linux/delay.h>19 20#include <linux/workqueue.h>21 22#include "common.h"23#include "4965.h"24 25#define IL4965_RS_NAME "iwl-4965-rs"26 27#define NUM_TRY_BEFORE_ANT_TOGGLE 128#define IL_NUMBER_TRY 129#define IL_HT_NUMBER_TRY 330 31#define RATE_MAX_WINDOW 62 /* # tx in history win */32#define RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */33#define RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */34 35/* max allowed rate miss before sync LQ cmd */36#define IL_MISSED_RATE_MAX 1537/* max time to accum history 2 seconds */38#define RATE_SCALE_FLUSH_INTVL (3*HZ)39 40static u8 rs_ht_to_legacy[] = {41 RATE_6M_IDX, RATE_6M_IDX,42 RATE_6M_IDX, RATE_6M_IDX,43 RATE_6M_IDX,44 RATE_6M_IDX, RATE_9M_IDX,45 RATE_12M_IDX, RATE_18M_IDX,46 RATE_24M_IDX, RATE_36M_IDX,47 RATE_48M_IDX, RATE_54M_IDX48};49 50static const u8 ant_toggle_lookup[] = {51 /*ANT_NONE -> */ ANT_NONE,52 /*ANT_A -> */ ANT_B,53 /*ANT_B -> */ ANT_C,54 /*ANT_AB -> */ ANT_BC,55 /*ANT_C -> */ ANT_A,56 /*ANT_AC -> */ ANT_AB,57 /*ANT_BC -> */ ANT_AC,58 /*ANT_ABC -> */ ANT_ABC,59};60 61#define IL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \62 [RATE_##r##M_IDX] = { RATE_##r##M_PLCP, \63 RATE_SISO_##s##M_PLCP, \64 RATE_MIMO2_##s##M_PLCP,\65 RATE_##r##M_IEEE, \66 RATE_##ip##M_IDX, \67 RATE_##in##M_IDX, \68 RATE_##rp##M_IDX, \69 RATE_##rn##M_IDX, \70 RATE_##pp##M_IDX, \71 RATE_##np##M_IDX }72 73/*74 * Parameter order:75 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate76 *77 * If there isn't a valid next or previous rate then INV is used which78 * maps to RATE_INVALID79 *80 */81const struct il_rate_info il_rates[RATE_COUNT] = {82 IL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */83 IL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */84 IL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */85 IL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */86 IL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */87 IL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */88 IL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */89 IL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */90 IL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */91 IL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */92 IL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */93 IL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */94 IL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */95};96 97static int98il4965_hwrate_to_plcp_idx(u32 rate_n_flags)99{100 int idx = 0;101 102 /* HT rate format */103 if (rate_n_flags & RATE_MCS_HT_MSK) {104 idx = (rate_n_flags & 0xff);105 106 if (idx >= RATE_MIMO2_6M_PLCP)107 idx = idx - RATE_MIMO2_6M_PLCP;108 109 idx += IL_FIRST_OFDM_RATE;110 /* skip 9M not supported in ht */111 if (idx >= RATE_9M_IDX)112 idx += 1;113 if (idx >= IL_FIRST_OFDM_RATE && idx <= IL_LAST_OFDM_RATE)114 return idx;115 116 /* legacy rate format, search for match in table */117 } else {118 for (idx = 0; idx < ARRAY_SIZE(il_rates); idx++)119 if (il_rates[idx].plcp == (rate_n_flags & 0xFF))120 return idx;121 }122 123 return -1;124}125 126static void il4965_rs_rate_scale_perform(struct il_priv *il,127 struct sk_buff *skb,128 struct ieee80211_sta *sta,129 struct il_lq_sta *lq_sta);130static void il4965_rs_fill_link_cmd(struct il_priv *il,131 struct il_lq_sta *lq_sta, u32 rate_n_flags);132static void il4965_rs_stay_in_table(struct il_lq_sta *lq_sta,133 bool force_search);134 135#ifdef CONFIG_MAC80211_DEBUGFS136static void il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta,137 u32 *rate_n_flags, int idx);138#else139static void140il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)141{142}143#endif144 145/*146 * The following tables contain the expected throughput metrics for all rates147 *148 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits149 *150 * where invalid entries are zeros.151 *152 * CCK rates are only valid in legacy table and will only be used in G153 * (2.4 GHz) band.154 */155 156static s32 expected_tpt_legacy[RATE_COUNT] = {157 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0158};159 160static s32 expected_tpt_siso20MHz[4][RATE_COUNT] = {161 {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202}, /* Norm */162 {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210}, /* SGI */163 {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381}, /* AGG */164 {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */165};166 167static s32 expected_tpt_siso40MHz[4][RATE_COUNT] = {168 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */169 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */170 {0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */171 {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */172};173 174static s32 expected_tpt_mimo2_20MHz[4][RATE_COUNT] = {175 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */176 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */177 {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */178 {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI */179};180 181static s32 expected_tpt_mimo2_40MHz[4][RATE_COUNT] = {182 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */183 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */184 {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */185 {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */186};187 188/* mbps, mcs */189static const struct il_rate_mcs_info il_rate_mcs[RATE_COUNT] = {190 {"1", "BPSK DSSS"},191 {"2", "QPSK DSSS"},192 {"5.5", "BPSK CCK"},193 {"11", "QPSK CCK"},194 {"6", "BPSK 1/2"},195 {"9", "BPSK 1/2"},196 {"12", "QPSK 1/2"},197 {"18", "QPSK 3/4"},198 {"24", "16QAM 1/2"},199 {"36", "16QAM 3/4"},200 {"48", "64QAM 2/3"},201 {"54", "64QAM 3/4"},202 {"60", "64QAM 5/6"},203};204 205#define MCS_IDX_PER_STREAM (8)206 207static inline u8208il4965_rs_extract_rate(u32 rate_n_flags)209{210 return (u8) (rate_n_flags & 0xFF);211}212 213static void214il4965_rs_rate_scale_clear_win(struct il_rate_scale_data *win)215{216 win->data = 0;217 win->success_counter = 0;218 win->success_ratio = IL_INVALID_VALUE;219 win->counter = 0;220 win->average_tpt = IL_INVALID_VALUE;221 win->stamp = 0;222}223 224static inline u8225il4965_rs_is_valid_ant(u8 valid_antenna, u8 ant_type)226{227 return (ant_type & valid_antenna) == ant_type;228}229 230/*231 * removes the old data from the stats. All data that is older than232 * TID_MAX_TIME_DIFF, will be deleted.233 */234static void235il4965_rs_tl_rm_old_stats(struct il_traffic_load *tl, u32 curr_time)236{237 /* The oldest age we want to keep */238 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;239 240 while (tl->queue_count && tl->time_stamp < oldest_time) {241 tl->total -= tl->packet_count[tl->head];242 tl->packet_count[tl->head] = 0;243 tl->time_stamp += TID_QUEUE_CELL_SPACING;244 tl->queue_count--;245 tl->head++;246 if (tl->head >= TID_QUEUE_MAX_SIZE)247 tl->head = 0;248 }249}250 251/*252 * increment traffic load value for tid and also remove253 * any old values if passed the certain time period254 */255static u8256il4965_rs_tl_add_packet(struct il_lq_sta *lq_data, struct ieee80211_hdr *hdr)257{258 u32 curr_time = jiffies_to_msecs(jiffies);259 u32 time_diff;260 s32 idx;261 struct il_traffic_load *tl = NULL;262 u8 tid;263 264 if (ieee80211_is_data_qos(hdr->frame_control)) {265 u8 *qc = ieee80211_get_qos_ctl(hdr);266 tid = qc[0] & 0xf;267 } else268 return MAX_TID_COUNT;269 270 if (unlikely(tid >= TID_MAX_LOAD_COUNT))271 return MAX_TID_COUNT;272 273 tl = &lq_data->load[tid];274 275 curr_time -= curr_time % TID_ROUND_VALUE;276 277 /* Happens only for the first packet. Initialize the data */278 if (!(tl->queue_count)) {279 tl->total = 1;280 tl->time_stamp = curr_time;281 tl->queue_count = 1;282 tl->head = 0;283 tl->packet_count[0] = 1;284 return MAX_TID_COUNT;285 }286 287 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);288 idx = time_diff / TID_QUEUE_CELL_SPACING;289 290 /* The history is too long: remove data that is older than */291 /* TID_MAX_TIME_DIFF */292 if (idx >= TID_QUEUE_MAX_SIZE)293 il4965_rs_tl_rm_old_stats(tl, curr_time);294 295 idx = (tl->head + idx) % TID_QUEUE_MAX_SIZE;296 tl->packet_count[idx] = tl->packet_count[idx] + 1;297 tl->total = tl->total + 1;298 299 if ((idx + 1) > tl->queue_count)300 tl->queue_count = idx + 1;301 302 return tid;303}304 305/*306 get the traffic load value for tid307*/308static u32309il4965_rs_tl_get_load(struct il_lq_sta *lq_data, u8 tid)310{311 u32 curr_time = jiffies_to_msecs(jiffies);312 u32 time_diff;313 s32 idx;314 struct il_traffic_load *tl = NULL;315 316 if (tid >= TID_MAX_LOAD_COUNT)317 return 0;318 319 tl = &(lq_data->load[tid]);320 321 curr_time -= curr_time % TID_ROUND_VALUE;322 323 if (!(tl->queue_count))324 return 0;325 326 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);327 idx = time_diff / TID_QUEUE_CELL_SPACING;328 329 /* The history is too long: remove data that is older than */330 /* TID_MAX_TIME_DIFF */331 if (idx >= TID_QUEUE_MAX_SIZE)332 il4965_rs_tl_rm_old_stats(tl, curr_time);333 334 return tl->total;335}336 337static int338il4965_rs_tl_turn_on_agg_for_tid(struct il_priv *il, struct il_lq_sta *lq_data,339 u8 tid, struct ieee80211_sta *sta)340{341 int ret = -EAGAIN;342 u32 load;343 344 load = il4965_rs_tl_get_load(lq_data, tid);345 346 if (load > IL_AGG_LOAD_THRESHOLD) {347 D_HT("Starting Tx agg: STA: %pM tid: %d\n", sta->addr, tid);348 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);349 if (ret == -EAGAIN) {350 /*351 * driver and mac80211 is out of sync352 * this might be cause by reloading firmware353 * stop the tx ba session here354 */355 IL_ERR("Fail start Tx agg on tid: %d\n", tid);356 ieee80211_stop_tx_ba_session(sta, tid);357 }358 } else359 D_HT("Aggregation not enabled for tid %d because load = %u\n",360 tid, load);361 362 return ret;363}364 365static void366il4965_rs_tl_turn_on_agg(struct il_priv *il, u8 tid, struct il_lq_sta *lq_data,367 struct ieee80211_sta *sta)368{369 if (tid < TID_MAX_LOAD_COUNT)370 il4965_rs_tl_turn_on_agg_for_tid(il, lq_data, tid, sta);371 else372 IL_ERR("tid exceeds max load count: %d/%d\n", tid,373 TID_MAX_LOAD_COUNT);374}375 376static inline int377il4965_get_il4965_num_of_ant_from_rate(u32 rate_n_flags)378{379 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +380 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +381 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);382}383 384/*385 * Static function to get the expected throughput from an il_scale_tbl_info386 * that wraps a NULL pointer check387 */388static s32389il4965_get_expected_tpt(struct il_scale_tbl_info *tbl, int rs_idx)390{391 if (tbl->expected_tpt)392 return tbl->expected_tpt[rs_idx];393 return 0;394}395 396/*397 * il4965_rs_collect_tx_data - Update the success/failure sliding win398 *399 * We keep a sliding win of the last 62 packets transmitted400 * at this rate. win->data contains the bitmask of successful401 * packets.402 */403static int404il4965_rs_collect_tx_data(struct il_scale_tbl_info *tbl, int scale_idx,405 int attempts, int successes)406{407 struct il_rate_scale_data *win = NULL;408 static const u64 mask = (((u64) 1) << (RATE_MAX_WINDOW - 1));409 s32 fail_count, tpt;410 411 if (scale_idx < 0 || scale_idx >= RATE_COUNT)412 return -EINVAL;413 414 /* Select win for current tx bit rate */415 win = &(tbl->win[scale_idx]);416 417 /* Get expected throughput */418 tpt = il4965_get_expected_tpt(tbl, scale_idx);419 420 /*421 * Keep track of only the latest 62 tx frame attempts in this rate's422 * history win; anything older isn't really relevant any more.423 * If we have filled up the sliding win, drop the oldest attempt;424 * if the oldest attempt (highest bit in bitmap) shows "success",425 * subtract "1" from the success counter (this is the main reason426 * we keep these bitmaps!).427 */428 while (attempts > 0) {429 if (win->counter >= RATE_MAX_WINDOW) {430 431 /* remove earliest */432 win->counter = RATE_MAX_WINDOW - 1;433 434 if (win->data & mask) {435 win->data &= ~mask;436 win->success_counter--;437 }438 }439 440 /* Increment frames-attempted counter */441 win->counter++;442 443 /* Shift bitmap by one frame to throw away oldest history */444 win->data <<= 1;445 446 /* Mark the most recent #successes attempts as successful */447 if (successes > 0) {448 win->success_counter++;449 win->data |= 0x1;450 successes--;451 }452 453 attempts--;454 }455 456 /* Calculate current success ratio, avoid divide-by-0! */457 if (win->counter > 0)458 win->success_ratio =459 128 * (100 * win->success_counter) / win->counter;460 else461 win->success_ratio = IL_INVALID_VALUE;462 463 fail_count = win->counter - win->success_counter;464 465 /* Calculate average throughput, if we have enough history. */466 if (fail_count >= RATE_MIN_FAILURE_TH ||467 win->success_counter >= RATE_MIN_SUCCESS_TH)468 win->average_tpt = (win->success_ratio * tpt + 64) / 128;469 else470 win->average_tpt = IL_INVALID_VALUE;471 472 /* Tag this win as having been updated */473 win->stamp = jiffies;474 475 return 0;476}477 478/*479 * Fill uCode API rate_n_flags field, based on "search" or "active" table.480 */481static u32482il4965_rate_n_flags_from_tbl(struct il_priv *il, struct il_scale_tbl_info *tbl,483 int idx, u8 use_green)484{485 u32 rate_n_flags = 0;486 487 if (is_legacy(tbl->lq_type)) {488 rate_n_flags = il_rates[idx].plcp;489 if (idx >= IL_FIRST_CCK_RATE && idx <= IL_LAST_CCK_RATE)490 rate_n_flags |= RATE_MCS_CCK_MSK;491 492 } else if (is_Ht(tbl->lq_type)) {493 if (idx > IL_LAST_OFDM_RATE) {494 IL_ERR("Invalid HT rate idx %d\n", idx);495 idx = IL_LAST_OFDM_RATE;496 }497 rate_n_flags = RATE_MCS_HT_MSK;498 499 if (is_siso(tbl->lq_type))500 rate_n_flags |= il_rates[idx].plcp_siso;501 else502 rate_n_flags |= il_rates[idx].plcp_mimo2;503 } else {504 IL_ERR("Invalid tbl->lq_type %d\n", tbl->lq_type);505 }506 507 rate_n_flags |=508 ((tbl->ant_type << RATE_MCS_ANT_POS) & RATE_MCS_ANT_ABC_MSK);509 510 if (is_Ht(tbl->lq_type)) {511 if (tbl->is_ht40) {512 if (tbl->is_dup)513 rate_n_flags |= RATE_MCS_DUP_MSK;514 else515 rate_n_flags |= RATE_MCS_HT40_MSK;516 }517 if (tbl->is_SGI)518 rate_n_flags |= RATE_MCS_SGI_MSK;519 520 if (use_green) {521 rate_n_flags |= RATE_MCS_GF_MSK;522 if (is_siso(tbl->lq_type) && tbl->is_SGI) {523 rate_n_flags &= ~RATE_MCS_SGI_MSK;524 IL_ERR("GF was set with SGI:SISO\n");525 }526 }527 }528 return rate_n_flags;529}530 531/*532 * Interpret uCode API's rate_n_flags format,533 * fill "search" or "active" tx mode table.534 */535static int536il4965_rs_get_tbl_info_from_mcs(const u32 rate_n_flags,537 enum nl80211_band band,538 struct il_scale_tbl_info *tbl, int *rate_idx)539{540 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);541 u8 il4965_num_of_ant =542 il4965_get_il4965_num_of_ant_from_rate(rate_n_flags);543 u8 mcs;544 545 memset(tbl, 0, sizeof(struct il_scale_tbl_info));546 *rate_idx = il4965_hwrate_to_plcp_idx(rate_n_flags);547 548 if (*rate_idx == RATE_INVALID) {549 *rate_idx = -1;550 return -EINVAL;551 }552 tbl->is_SGI = 0; /* default legacy setup */553 tbl->is_ht40 = 0;554 tbl->is_dup = 0;555 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);556 tbl->lq_type = LQ_NONE;557 tbl->max_search = IL_MAX_SEARCH;558 559 /* legacy rate format */560 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {561 if (il4965_num_of_ant == 1) {562 if (band == NL80211_BAND_5GHZ)563 tbl->lq_type = LQ_A;564 else565 tbl->lq_type = LQ_G;566 }567 /* HT rate format */568 } else {569 if (rate_n_flags & RATE_MCS_SGI_MSK)570 tbl->is_SGI = 1;571 572 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||573 (rate_n_flags & RATE_MCS_DUP_MSK))574 tbl->is_ht40 = 1;575 576 if (rate_n_flags & RATE_MCS_DUP_MSK)577 tbl->is_dup = 1;578 579 mcs = il4965_rs_extract_rate(rate_n_flags);580 581 /* SISO */582 if (mcs <= RATE_SISO_60M_PLCP) {583 if (il4965_num_of_ant == 1)584 tbl->lq_type = LQ_SISO; /*else NONE */585 /* MIMO2 */586 } else {587 if (il4965_num_of_ant == 2)588 tbl->lq_type = LQ_MIMO2;589 }590 }591 return 0;592}593 594/* switch to another antenna/antennas and return 1 */595/* if no other valid antenna found, return 0 */596static int597il4965_rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,598 struct il_scale_tbl_info *tbl)599{600 u8 new_ant_type;601 602 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)603 return 0;604 605 if (!il4965_rs_is_valid_ant(valid_ant, tbl->ant_type))606 return 0;607 608 new_ant_type = ant_toggle_lookup[tbl->ant_type];609 610 while (new_ant_type != tbl->ant_type &&611 !il4965_rs_is_valid_ant(valid_ant, new_ant_type))612 new_ant_type = ant_toggle_lookup[new_ant_type];613 614 if (new_ant_type == tbl->ant_type)615 return 0;616 617 tbl->ant_type = new_ant_type;618 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;619 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;620 return 1;621}622 623/*624 * Green-field mode is valid if the station supports it and625 * there are no non-GF stations present in the BSS.626 */627static bool628il4965_rs_use_green(struct il_priv *il, struct ieee80211_sta *sta)629{630 return (sta->deflink.ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&631 !il->ht.non_gf_sta_present;632}633 634/*635 * il4965_rs_get_supported_rates - get the available rates636 *637 * if management frame or broadcast frame only return638 * basic available rates.639 *640 */641static u16642il4965_rs_get_supported_rates(struct il_lq_sta *lq_sta,643 struct ieee80211_hdr *hdr,644 enum il_table_type rate_type)645{646 if (is_legacy(rate_type)) {647 return lq_sta->active_legacy_rate;648 } else {649 if (is_siso(rate_type))650 return lq_sta->active_siso_rate;651 else652 return lq_sta->active_mimo2_rate;653 }654}655 656static u16657il4965_rs_get_adjacent_rate(struct il_priv *il, u8 idx, u16 rate_mask,658 int rate_type)659{660 u8 high = RATE_INVALID;661 u8 low = RATE_INVALID;662 663 /* 802.11A or ht walks to the next literal adjacent rate in664 * the rate table */665 if (is_a_band(rate_type) || !is_legacy(rate_type)) {666 int i;667 u32 mask;668 669 /* Find the previous rate that is in the rate mask */670 i = idx - 1;671 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {672 if (rate_mask & mask) {673 low = i;674 break;675 }676 }677 678 /* Find the next rate that is in the rate mask */679 i = idx + 1;680 for (mask = (1 << i); i < RATE_COUNT; i++, mask <<= 1) {681 if (rate_mask & mask) {682 high = i;683 break;684 }685 }686 687 return (high << 8) | low;688 }689 690 low = idx;691 while (low != RATE_INVALID) {692 low = il_rates[low].prev_rs;693 if (low == RATE_INVALID)694 break;695 if (rate_mask & (1 << low))696 break;697 D_RATE("Skipping masked lower rate: %d\n", low);698 }699 700 high = idx;701 while (high != RATE_INVALID) {702 high = il_rates[high].next_rs;703 if (high == RATE_INVALID)704 break;705 if (rate_mask & (1 << high))706 break;707 D_RATE("Skipping masked higher rate: %d\n", high);708 }709 710 return (high << 8) | low;711}712 713static u32714il4965_rs_get_lower_rate(struct il_lq_sta *lq_sta,715 struct il_scale_tbl_info *tbl, u8 scale_idx,716 u8 ht_possible)717{718 s32 low;719 u16 rate_mask;720 u16 high_low;721 u8 switch_to_legacy = 0;722 u8 is_green = lq_sta->is_green;723 struct il_priv *il = lq_sta->drv;724 725 /* check if we need to switch from HT to legacy rates.726 * assumption is that mandatory rates (1Mbps or 6Mbps)727 * are always supported (spec demand) */728 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_idx)) {729 switch_to_legacy = 1;730 scale_idx = rs_ht_to_legacy[scale_idx];731 if (lq_sta->band == NL80211_BAND_5GHZ)732 tbl->lq_type = LQ_A;733 else734 tbl->lq_type = LQ_G;735 736 if (il4965_num_of_ant(tbl->ant_type) > 1)737 tbl->ant_type =738 il4965_first_antenna(il->hw_params.valid_tx_ant);739 740 tbl->is_ht40 = 0;741 tbl->is_SGI = 0;742 tbl->max_search = IL_MAX_SEARCH;743 }744 745 rate_mask = il4965_rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);746 747 /* Mask with station rate restriction */748 if (is_legacy(tbl->lq_type)) {749 /* supp_rates has no CCK bits in A mode */750 if (lq_sta->band == NL80211_BAND_5GHZ)751 rate_mask =752 (u16) (rate_mask &753 (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));754 else755 rate_mask = (u16) (rate_mask & lq_sta->supp_rates);756 }757 758 /* If we switched from HT to legacy, check current rate */759 if (switch_to_legacy && (rate_mask & (1 << scale_idx))) {760 low = scale_idx;761 goto out;762 }763 764 high_low =765 il4965_rs_get_adjacent_rate(lq_sta->drv, scale_idx, rate_mask,766 tbl->lq_type);767 low = high_low & 0xff;768 769 if (low == RATE_INVALID)770 low = scale_idx;771 772out:773 return il4965_rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);774}775 776/*777 * Simple function to compare two rate scale table types778 */779static bool780il4965_table_type_matches(struct il_scale_tbl_info *a,781 struct il_scale_tbl_info *b)782{783 return (a->lq_type == b->lq_type && a->ant_type == b->ant_type &&784 a->is_SGI == b->is_SGI);785}786 787/*788 * mac80211 sends us Tx status789 */790static void791il4965_rs_tx_status(void *il_r, struct ieee80211_supported_band *sband,792 struct ieee80211_sta *sta, void *il_sta,793 struct sk_buff *skb)794{795 int legacy_success;796 int retries;797 int rs_idx, mac_idx, i;798 struct il_lq_sta *lq_sta = il_sta;799 struct il_link_quality_cmd *table;800 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;801 struct il_priv *il = (struct il_priv *)il_r;802 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);803 enum mac80211_rate_control_flags mac_flags;804 u32 tx_rate;805 struct il_scale_tbl_info tbl_type;806 struct il_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;807 808 D_RATE("get frame ack response, update rate scale win\n");809 810 /* Treat uninitialized rate scaling data same as non-existing. */811 if (!lq_sta) {812 D_RATE("Station rate scaling not created yet.\n");813 return;814 } else if (!lq_sta->drv) {815 D_RATE("Rate scaling not initialized yet.\n");816 return;817 }818 819 if (!ieee80211_is_data(hdr->frame_control) ||820 (info->flags & IEEE80211_TX_CTL_NO_ACK))821 return;822 823 /* This packet was aggregated but doesn't carry status info */824 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&825 !(info->flags & IEEE80211_TX_STAT_AMPDU))826 return;827 828 /*829 * Ignore this Tx frame response if its initial rate doesn't match830 * that of latest Link Quality command. There may be stragglers831 * from a previous Link Quality command, but we're no longer interested832 * in those; they're either from the "active" mode while we're trying833 * to check "search" mode, or a prior "search" mode after we've moved834 * to a new "search" mode (which might become the new "active" mode).835 */836 table = &lq_sta->lq;837 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);838 il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type, &rs_idx);839 if (il->band == NL80211_BAND_5GHZ)840 rs_idx -= IL_FIRST_OFDM_RATE;841 mac_flags = info->status.rates[0].flags;842 mac_idx = info->status.rates[0].idx;843 /* For HT packets, map MCS to PLCP */844 if (mac_flags & IEEE80211_TX_RC_MCS) {845 mac_idx &= RATE_MCS_CODE_MSK; /* Remove # of streams */846 if (mac_idx >= (RATE_9M_IDX - IL_FIRST_OFDM_RATE))847 mac_idx++;848 /*849 * mac80211 HT idx is always zero-idxed; we need to move850 * HT OFDM rates after CCK rates in 2.4 GHz band851 */852 if (il->band == NL80211_BAND_2GHZ)853 mac_idx += IL_FIRST_OFDM_RATE;854 }855 /* Here we actually compare this rate to the latest LQ command */856 if (mac_idx < 0 ||857 tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI) ||858 tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ||859 tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA) ||860 tbl_type.ant_type != info->status.antenna ||861 !!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)862 || !!(tx_rate & RATE_MCS_GF_MSK) !=863 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD) || rs_idx != mac_idx) {864 D_RATE("initial rate %d does not match %d (0x%x)\n", mac_idx,865 rs_idx, tx_rate);866 /*867 * Since rates mis-match, the last LQ command may have failed.868 * After IL_MISSED_RATE_MAX mis-matches, resync the uCode with869 * ... driver.870 */871 lq_sta->missed_rate_counter++;872 if (lq_sta->missed_rate_counter > IL_MISSED_RATE_MAX) {873 lq_sta->missed_rate_counter = 0;874 il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);875 }876 /* Regardless, ignore this status info for outdated rate */877 return;878 } else879 /* Rate did match, so reset the missed_rate_counter */880 lq_sta->missed_rate_counter = 0;881 882 /* Figure out if rate scale algorithm is in active or search table */883 if (il4965_table_type_matches884 (&tbl_type, &(lq_sta->lq_info[lq_sta->active_tbl]))) {885 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);886 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);887 } else888 if (il4965_table_type_matches889 (&tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {890 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);891 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);892 } else {893 D_RATE("Neither active nor search matches tx rate\n");894 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);895 D_RATE("active- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,896 tmp_tbl->ant_type, tmp_tbl->is_SGI);897 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);898 D_RATE("search- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,899 tmp_tbl->ant_type, tmp_tbl->is_SGI);900 D_RATE("actual- lq:%x, ant:%x, SGI:%d\n", tbl_type.lq_type,901 tbl_type.ant_type, tbl_type.is_SGI);902 /*903 * no matching table found, let's by-pass the data collection904 * and continue to perform rate scale to find the rate table905 */906 il4965_rs_stay_in_table(lq_sta, true);907 goto done;908 }909 910 /*911 * Updating the frame history depends on whether packets were912 * aggregated.913 *914 * For aggregation, all packets were transmitted at the same rate, the915 * first idx into rate scale table.916 */917 if (info->flags & IEEE80211_TX_STAT_AMPDU) {918 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);919 il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type,920 &rs_idx);921 il4965_rs_collect_tx_data(curr_tbl, rs_idx,922 info->status.ampdu_len,923 info->status.ampdu_ack_len);924 925 /* Update success/fail counts if not searching for new mode */926 if (lq_sta->stay_in_tbl) {927 lq_sta->total_success += info->status.ampdu_ack_len;928 lq_sta->total_failed +=929 (info->status.ampdu_len -930 info->status.ampdu_ack_len);931 }932 } else {933 /*934 * For legacy, update frame history with for each Tx retry.935 */936 retries = info->status.rates[0].count - 1;937 /* HW doesn't send more than 15 retries */938 retries = min(retries, 15);939 940 /* The last transmission may have been successful */941 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);942 /* Collect data for each rate used during failed TX attempts */943 for (i = 0; i <= retries; ++i) {944 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);945 il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band,946 &tbl_type, &rs_idx);947 /*948 * Only collect stats if retried rate is in the same RS949 * table as active/search.950 */951 if (il4965_table_type_matches(&tbl_type, curr_tbl))952 tmp_tbl = curr_tbl;953 else if (il4965_table_type_matches954 (&tbl_type, other_tbl))955 tmp_tbl = other_tbl;956 else957 continue;958 il4965_rs_collect_tx_data(tmp_tbl, rs_idx, 1,959 i <960 retries ? 0 : legacy_success);961 }962 963 /* Update success/fail counts if not searching for new mode */964 if (lq_sta->stay_in_tbl) {965 lq_sta->total_success += legacy_success;966 lq_sta->total_failed += retries + (1 - legacy_success);967 }968 }969 /* The last TX rate is cached in lq_sta; it's set in if/else above */970 lq_sta->last_rate_n_flags = tx_rate;971done:972 /* See if there's a better rate or modulation mode to try. */973 if (sta->deflink.supp_rates[sband->band])974 il4965_rs_rate_scale_perform(il, skb, sta, lq_sta);975}976 977/*978 * Begin a period of staying with a selected modulation mode.979 * Set "stay_in_tbl" flag to prevent any mode switches.980 * Set frame tx success limits according to legacy vs. high-throughput,981 * and reset overall (spanning all rates) tx success history stats.982 * These control how long we stay using same modulation mode before983 * searching for a new mode.984 */985static void986il4965_rs_set_stay_in_table(struct il_priv *il, u8 is_legacy,987 struct il_lq_sta *lq_sta)988{989 D_RATE("we are staying in the same table\n");990 lq_sta->stay_in_tbl = 1; /* only place this gets set */991 if (is_legacy) {992 lq_sta->table_count_limit = IL_LEGACY_TBL_COUNT;993 lq_sta->max_failure_limit = IL_LEGACY_FAILURE_LIMIT;994 lq_sta->max_success_limit = IL_LEGACY_SUCCESS_LIMIT;995 } else {996 lq_sta->table_count_limit = IL_NONE_LEGACY_TBL_COUNT;997 lq_sta->max_failure_limit = IL_NONE_LEGACY_FAILURE_LIMIT;998 lq_sta->max_success_limit = IL_NONE_LEGACY_SUCCESS_LIMIT;999 }1000 lq_sta->table_count = 0;1001 lq_sta->total_failed = 0;1002 lq_sta->total_success = 0;1003 lq_sta->flush_timer = jiffies;1004 lq_sta->action_counter = 0;1005}1006 1007/*1008 * Find correct throughput table for given mode of modulation1009 */1010static void1011il4965_rs_set_expected_tpt_table(struct il_lq_sta *lq_sta,1012 struct il_scale_tbl_info *tbl)1013{1014 /* Used to choose among HT tables */1015 s32(*ht_tbl_pointer)[RATE_COUNT];1016 1017 /* Check for invalid LQ type */1018 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {1019 tbl->expected_tpt = expected_tpt_legacy;1020 return;1021 }1022 1023 /* Legacy rates have only one table */1024 if (is_legacy(tbl->lq_type)) {1025 tbl->expected_tpt = expected_tpt_legacy;1026 return;1027 }1028 1029 /* Choose among many HT tables depending on number of streams1030 * (SISO/MIMO2), channel width (20/40), SGI, and aggregation1031 * status */1032 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))1033 ht_tbl_pointer = expected_tpt_siso20MHz;1034 else if (is_siso(tbl->lq_type))1035 ht_tbl_pointer = expected_tpt_siso40MHz;1036 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))1037 ht_tbl_pointer = expected_tpt_mimo2_20MHz;1038 else /* if (is_mimo2(tbl->lq_type)) <-- must be true */1039 ht_tbl_pointer = expected_tpt_mimo2_40MHz;1040 1041 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */1042 tbl->expected_tpt = ht_tbl_pointer[0];1043 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */1044 tbl->expected_tpt = ht_tbl_pointer[1];1045 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */1046 tbl->expected_tpt = ht_tbl_pointer[2];1047 else /* AGG+SGI */1048 tbl->expected_tpt = ht_tbl_pointer[3];1049}1050 1051/*1052 * Find starting rate for new "search" high-throughput mode of modulation.1053 * Goal is to find lowest expected rate (under perfect conditions) that is1054 * above the current measured throughput of "active" mode, to give new mode1055 * a fair chance to prove itself without too many challenges.1056 *1057 * This gets called when transitioning to more aggressive modulation1058 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive1059 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need1060 * to decrease to match "active" throughput. When moving from MIMO to SISO,1061 * bit rate will typically need to increase, but not if performance was bad.1062 */1063static s321064il4965_rs_get_best_rate(struct il_priv *il, struct il_lq_sta *lq_sta,1065 struct il_scale_tbl_info *tbl, /* "search" */1066 u16 rate_mask, s8 idx)1067{1068 /* "active" values */1069 struct il_scale_tbl_info *active_tbl =1070 &(lq_sta->lq_info[lq_sta->active_tbl]);1071 s32 active_sr = active_tbl->win[idx].success_ratio;1072 s32 active_tpt = active_tbl->expected_tpt[idx];1073 1074 /* expected "search" throughput */1075 s32 *tpt_tbl = tbl->expected_tpt;1076 1077 s32 new_rate, high, low, start_hi;1078 u16 high_low;1079 s8 rate = idx;1080 1081 new_rate = high = low = start_hi = RATE_INVALID;1082 1083 for (;;) {1084 high_low =1085 il4965_rs_get_adjacent_rate(il, rate, rate_mask,1086 tbl->lq_type);1087 1088 low = high_low & 0xff;1089 high = (high_low >> 8) & 0xff;1090 1091 /*1092 * Lower the "search" bit rate, to give new "search" mode1093 * approximately the same throughput as "active" if:1094 *1095 * 1) "Active" mode has been working modestly well (but not1096 * great), and expected "search" throughput (under perfect1097 * conditions) at candidate rate is above the actual1098 * measured "active" throughput (but less than expected1099 * "active" throughput under perfect conditions).1100 * OR1101 * 2) "Active" mode has been working perfectly or very well1102 * and expected "search" throughput (under perfect1103 * conditions) at candidate rate is above expected1104 * "active" throughput (under perfect conditions).1105 */1106 if ((100 * tpt_tbl[rate] > lq_sta->last_tpt &&1107 (active_sr > RATE_DECREASE_TH && active_sr <= RATE_HIGH_TH1108 && tpt_tbl[rate] <= active_tpt)) ||1109 (active_sr >= RATE_SCALE_SWITCH &&1110 tpt_tbl[rate] > active_tpt)) {1111 1112 /* (2nd or later pass)1113 * If we've already tried to raise the rate, and are1114 * now trying to lower it, use the higher rate. */1115 if (start_hi != RATE_INVALID) {1116 new_rate = start_hi;1117 break;1118 }1119 1120 new_rate = rate;1121 1122 /* Loop again with lower rate */1123 if (low != RATE_INVALID)1124 rate = low;1125 1126 /* Lower rate not available, use the original */1127 else1128 break;1129 1130 /* Else try to raise the "search" rate to match "active" */1131 } else {1132 /* (2nd or later pass)1133 * If we've already tried to lower the rate, and are1134 * now trying to raise it, use the lower rate. */1135 if (new_rate != RATE_INVALID)1136 break;1137 1138 /* Loop again with higher rate */1139 else if (high != RATE_INVALID) {1140 start_hi = high;1141 rate = high;1142 1143 /* Higher rate not available, use the original */1144 } else {1145 new_rate = rate;1146 break;1147 }1148 }1149 }1150 1151 return new_rate;1152}1153 1154/*1155 * Set up search table for MIMO21156 */1157static int1158il4965_rs_switch_to_mimo2(struct il_priv *il, struct il_lq_sta *lq_sta,1159 struct ieee80211_conf *conf,1160 struct ieee80211_sta *sta,1161 struct il_scale_tbl_info *tbl, int idx)1162{1163 u16 rate_mask;1164 s32 rate;1165 s8 is_green = lq_sta->is_green;1166 1167 if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported)1168 return -1;1169 1170 if (sta->deflink.smps_mode == IEEE80211_SMPS_STATIC)1171 return -1;1172 1173 /* Need both Tx chains/antennas to support MIMO */1174 if (il->hw_params.tx_chains_num < 2)1175 return -1;1176 1177 D_RATE("LQ: try to switch to MIMO2\n");1178 1179 tbl->lq_type = LQ_MIMO2;1180 tbl->is_dup = lq_sta->is_dup;1181 tbl->action = 0;1182 tbl->max_search = IL_MAX_SEARCH;1183 rate_mask = lq_sta->active_mimo2_rate;1184 1185 if (il_is_ht40_tx_allowed(il, &sta->deflink.ht_cap))1186 tbl->is_ht40 = 1;1187 else1188 tbl->is_ht40 = 0;1189 1190 il4965_rs_set_expected_tpt_table(lq_sta, tbl);1191 1192 rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);1193 1194 D_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);1195 if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {1196 D_RATE("Can't switch with idx %d rate mask %x\n", rate,1197 rate_mask);1198 return -1;1199 }1200 tbl->current_rate =1201 il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);1202 1203 D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,1204 is_green);1205 return 0;1206}1207 1208/*1209 * Set up search table for SISO1210 */1211static int1212il4965_rs_switch_to_siso(struct il_priv *il, struct il_lq_sta *lq_sta,1213 struct ieee80211_conf *conf, struct ieee80211_sta *sta,1214 struct il_scale_tbl_info *tbl, int idx)1215{1216 u16 rate_mask;1217 u8 is_green = lq_sta->is_green;1218 s32 rate;1219 1220 if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported)1221 return -1;1222 1223 D_RATE("LQ: try to switch to SISO\n");1224 1225 tbl->is_dup = lq_sta->is_dup;1226 tbl->lq_type = LQ_SISO;1227 tbl->action = 0;1228 tbl->max_search = IL_MAX_SEARCH;1229 rate_mask = lq_sta->active_siso_rate;1230 1231 if (il_is_ht40_tx_allowed(il, &sta->deflink.ht_cap))1232 tbl->is_ht40 = 1;1233 else1234 tbl->is_ht40 = 0;1235 1236 if (is_green)1237 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield */1238 1239 il4965_rs_set_expected_tpt_table(lq_sta, tbl);1240 rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);1241 1242 D_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);1243 if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {1244 D_RATE("can not switch with idx %d rate mask %x\n", rate,1245 rate_mask);1246 return -1;1247 }1248 tbl->current_rate =1249 il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);1250 D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,1251 is_green);1252 return 0;1253}1254 1255/*1256 * Try to switch to new modulation mode from legacy1257 */1258static int1259il4965_rs_move_legacy_other(struct il_priv *il, struct il_lq_sta *lq_sta,1260 struct ieee80211_conf *conf,1261 struct ieee80211_sta *sta, int idx)1262{1263 struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);1264 struct il_scale_tbl_info *search_tbl =1265 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);1266 struct il_rate_scale_data *win = &(tbl->win[idx]);1267 u32 sz =1268 (sizeof(struct il_scale_tbl_info) -1269 (sizeof(struct il_rate_scale_data) * RATE_COUNT));1270 u8 start_action;1271 u8 valid_tx_ant = il->hw_params.valid_tx_ant;1272 u8 tx_chains_num = il->hw_params.tx_chains_num;1273 int ret = 0;1274 u8 update_search_tbl_counter = 0;1275 1276 tbl->action = IL_LEGACY_SWITCH_SISO;1277 1278 start_action = tbl->action;1279 for (;;) {1280 lq_sta->action_counter++;1281 switch (tbl->action) {1282 case IL_LEGACY_SWITCH_ANTENNA1:1283 case IL_LEGACY_SWITCH_ANTENNA2:1284 D_RATE("LQ: Legacy toggle Antenna\n");1285 1286 if ((tbl->action == IL_LEGACY_SWITCH_ANTENNA1 &&1287 tx_chains_num <= 1) ||1288 (tbl->action == IL_LEGACY_SWITCH_ANTENNA2 &&1289 tx_chains_num <= 2))1290 break;1291 1292 /* Don't change antenna if success has been great */1293 if (win->success_ratio >= IL_RS_GOOD_RATIO)1294 break;1295 1296 /* Set up search table to try other antenna */1297 memcpy(search_tbl, tbl, sz);1298 1299 if (il4965_rs_toggle_antenna1300 (valid_tx_ant, &search_tbl->current_rate,1301 search_tbl)) {1302 update_search_tbl_counter = 1;1303 il4965_rs_set_expected_tpt_table(lq_sta,1304 search_tbl);1305 goto out;1306 }1307 break;1308 case IL_LEGACY_SWITCH_SISO:1309 D_RATE("LQ: Legacy switch to SISO\n");1310 1311 /* Set up search table to try SISO */1312 memcpy(search_tbl, tbl, sz);1313 search_tbl->is_SGI = 0;1314 ret =1315 il4965_rs_switch_to_siso(il, lq_sta, conf, sta,1316 search_tbl, idx);1317 if (!ret) {1318 lq_sta->action_counter = 0;1319 goto out;1320 }1321 1322 break;1323 case IL_LEGACY_SWITCH_MIMO2_AB:1324 case IL_LEGACY_SWITCH_MIMO2_AC:1325 case IL_LEGACY_SWITCH_MIMO2_BC:1326 D_RATE("LQ: Legacy switch to MIMO2\n");1327 1328 /* Set up search table to try MIMO */1329 memcpy(search_tbl, tbl, sz);1330 search_tbl->is_SGI = 0;1331 1332 if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AB)1333 search_tbl->ant_type = ANT_AB;1334 else if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AC)1335 search_tbl->ant_type = ANT_AC;1336 else1337 search_tbl->ant_type = ANT_BC;1338 1339 if (!il4965_rs_is_valid_ant1340 (valid_tx_ant, search_tbl->ant_type))1341 break;1342 1343 ret =1344 il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,1345 search_tbl, idx);1346 if (!ret) {1347 lq_sta->action_counter = 0;1348 goto out;1349 }1350 break;1351 }1352 tbl->action++;1353 if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)1354 tbl->action = IL_LEGACY_SWITCH_ANTENNA1;1355 1356 if (tbl->action == start_action)1357 break;1358 1359 }1360 search_tbl->lq_type = LQ_NONE;1361 return 0;1362 1363out:1364 lq_sta->search_better_tbl = 1;1365 tbl->action++;1366 if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)1367 tbl->action = IL_LEGACY_SWITCH_ANTENNA1;1368 if (update_search_tbl_counter)1369 search_tbl->action = tbl->action;1370 return 0;1371 1372}1373 1374/*1375 * Try to switch to new modulation mode from SISO1376 */1377static int1378il4965_rs_move_siso_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,1379 struct ieee80211_conf *conf,1380 struct ieee80211_sta *sta, int idx)1381{1382 u8 is_green = lq_sta->is_green;1383 struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);1384 struct il_scale_tbl_info *search_tbl =1385 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);1386 struct il_rate_scale_data *win = &(tbl->win[idx]);1387 struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;1388 u32 sz =1389 (sizeof(struct il_scale_tbl_info) -1390 (sizeof(struct il_rate_scale_data) * RATE_COUNT));1391 u8 start_action;1392 u8 valid_tx_ant = il->hw_params.valid_tx_ant;1393 u8 tx_chains_num = il->hw_params.tx_chains_num;1394 u8 update_search_tbl_counter = 0;1395 int ret;1396 1397 start_action = tbl->action;1398 1399 for (;;) {1400 lq_sta->action_counter++;1401 switch (tbl->action) {1402 case IL_SISO_SWITCH_ANTENNA1:1403 case IL_SISO_SWITCH_ANTENNA2:1404 D_RATE("LQ: SISO toggle Antenna\n");1405 if ((tbl->action == IL_SISO_SWITCH_ANTENNA1 &&1406 tx_chains_num <= 1) ||1407 (tbl->action == IL_SISO_SWITCH_ANTENNA2 &&1408 tx_chains_num <= 2))1409 break;1410 1411 if (win->success_ratio >= IL_RS_GOOD_RATIO)1412 break;1413 1414 memcpy(search_tbl, tbl, sz);1415 if (il4965_rs_toggle_antenna1416 (valid_tx_ant, &search_tbl->current_rate,1417 search_tbl)) {1418 update_search_tbl_counter = 1;1419 goto out;1420 }1421 break;1422 case IL_SISO_SWITCH_MIMO2_AB:1423 case IL_SISO_SWITCH_MIMO2_AC:1424 case IL_SISO_SWITCH_MIMO2_BC:1425 D_RATE("LQ: SISO switch to MIMO2\n");1426 memcpy(search_tbl, tbl, sz);1427 search_tbl->is_SGI = 0;1428 1429 if (tbl->action == IL_SISO_SWITCH_MIMO2_AB)1430 search_tbl->ant_type = ANT_AB;1431 else if (tbl->action == IL_SISO_SWITCH_MIMO2_AC)1432 search_tbl->ant_type = ANT_AC;1433 else1434 search_tbl->ant_type = ANT_BC;1435 1436 if (!il4965_rs_is_valid_ant1437 (valid_tx_ant, search_tbl->ant_type))1438 break;1439 1440 ret =1441 il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,1442 search_tbl, idx);1443 if (!ret)1444 goto out;1445 break;1446 case IL_SISO_SWITCH_GI:1447 if (!tbl->is_ht40 &&1448 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))1449 break;1450 if (tbl->is_ht40 &&1451 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))1452 break;1453 1454 D_RATE("LQ: SISO toggle SGI/NGI\n");1455 1456 memcpy(search_tbl, tbl, sz);1457 if (is_green) {1458 if (!tbl->is_SGI)1459 break;1460 else1461 IL_ERR("SGI was set in GF+SISO\n");1462 }1463 search_tbl->is_SGI = !tbl->is_SGI;1464 il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);1465 if (tbl->is_SGI) {1466 s32 tpt = lq_sta->last_tpt / 100;1467 if (tpt >= search_tbl->expected_tpt[idx])1468 break;1469 }1470 search_tbl->current_rate =1471 il4965_rate_n_flags_from_tbl(il, search_tbl, idx,1472 is_green);1473 update_search_tbl_counter = 1;1474 goto out;1475 }1476 tbl->action++;1477 if (tbl->action > IL_SISO_SWITCH_GI)1478 tbl->action = IL_SISO_SWITCH_ANTENNA1;1479 1480 if (tbl->action == start_action)1481 break;1482 }1483 search_tbl->lq_type = LQ_NONE;1484 return 0;1485 1486out:1487 lq_sta->search_better_tbl = 1;1488 tbl->action++;1489 if (tbl->action > IL_SISO_SWITCH_GI)1490 tbl->action = IL_SISO_SWITCH_ANTENNA1;1491 if (update_search_tbl_counter)1492 search_tbl->action = tbl->action;1493 1494 return 0;1495}1496 1497/*1498 * Try to switch to new modulation mode from MIMO21499 */1500static int1501il4965_rs_move_mimo2_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,1502 struct ieee80211_conf *conf,1503 struct ieee80211_sta *sta, int idx)1504{1505 s8 is_green = lq_sta->is_green;1506 struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);1507 struct il_scale_tbl_info *search_tbl =1508 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);1509 struct il_rate_scale_data *win = &(tbl->win[idx]);1510 struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;1511 u32 sz =1512 (sizeof(struct il_scale_tbl_info) -1513 (sizeof(struct il_rate_scale_data) * RATE_COUNT));1514 u8 start_action;1515 u8 valid_tx_ant = il->hw_params.valid_tx_ant;1516 u8 tx_chains_num = il->hw_params.tx_chains_num;1517 u8 update_search_tbl_counter = 0;1518 int ret;1519 1520 start_action = tbl->action;1521 for (;;) {1522 lq_sta->action_counter++;1523 switch (tbl->action) {1524 case IL_MIMO2_SWITCH_ANTENNA1:1525 case IL_MIMO2_SWITCH_ANTENNA2:1526 D_RATE("LQ: MIMO2 toggle Antennas\n");1527 1528 if (tx_chains_num <= 2)1529 break;1530 1531 if (win->success_ratio >= IL_RS_GOOD_RATIO)1532 break;1533 1534 memcpy(search_tbl, tbl, sz);1535 if (il4965_rs_toggle_antenna1536 (valid_tx_ant, &search_tbl->current_rate,1537 search_tbl)) {1538 update_search_tbl_counter = 1;1539 goto out;1540 }1541 break;1542 case IL_MIMO2_SWITCH_SISO_A:1543 case IL_MIMO2_SWITCH_SISO_B:1544 case IL_MIMO2_SWITCH_SISO_C:1545 D_RATE("LQ: MIMO2 switch to SISO\n");1546 1547 /* Set up new search table for SISO */1548 memcpy(search_tbl, tbl, sz);1549 1550 if (tbl->action == IL_MIMO2_SWITCH_SISO_A)1551 search_tbl->ant_type = ANT_A;1552 else if (tbl->action == IL_MIMO2_SWITCH_SISO_B)1553 search_tbl->ant_type = ANT_B;1554 else1555 search_tbl->ant_type = ANT_C;1556 1557 if (!il4965_rs_is_valid_ant1558 (valid_tx_ant, search_tbl->ant_type))1559 break;1560 1561 ret =1562 il4965_rs_switch_to_siso(il, lq_sta, conf, sta,1563 search_tbl, idx);1564 if (!ret)1565 goto out;1566 1567 break;1568 1569 case IL_MIMO2_SWITCH_GI:1570 if (!tbl->is_ht40 &&1571 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))1572 break;1573 if (tbl->is_ht40 &&1574 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))1575 break;1576 1577 D_RATE("LQ: MIMO2 toggle SGI/NGI\n");1578 1579 /* Set up new search table for MIMO2 */1580 memcpy(search_tbl, tbl, sz);1581 search_tbl->is_SGI = !tbl->is_SGI;1582 il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);1583 /*1584 * If active table already uses the fastest possible1585 * modulation (dual stream with short guard interval),1586 * and it's working well, there's no need to look1587 * for a better type of modulation!1588 */1589 if (tbl->is_SGI) {1590 s32 tpt = lq_sta->last_tpt / 100;1591 if (tpt >= search_tbl->expected_tpt[idx])1592 break;1593 }1594 search_tbl->current_rate =1595 il4965_rate_n_flags_from_tbl(il, search_tbl, idx,1596 is_green);1597 update_search_tbl_counter = 1;1598 goto out;1599 1600 }1601 tbl->action++;1602 if (tbl->action > IL_MIMO2_SWITCH_GI)1603 tbl->action = IL_MIMO2_SWITCH_ANTENNA1;1604 1605 if (tbl->action == start_action)1606 break;1607 }1608 search_tbl->lq_type = LQ_NONE;1609 return 0;1610out:1611 lq_sta->search_better_tbl = 1;1612 tbl->action++;1613 if (tbl->action > IL_MIMO2_SWITCH_GI)1614 tbl->action = IL_MIMO2_SWITCH_ANTENNA1;1615 if (update_search_tbl_counter)1616 search_tbl->action = tbl->action;1617 1618 return 0;1619 1620}1621 1622/*1623 * Check whether we should continue using same modulation mode, or1624 * begin search for a new mode, based on:1625 * 1) # tx successes or failures while using this mode1626 * 2) # times calling this function1627 * 3) elapsed time in this mode (not used, for now)1628 */1629static void1630il4965_rs_stay_in_table(struct il_lq_sta *lq_sta, bool force_search)1631{1632 struct il_scale_tbl_info *tbl;1633 int i;1634 int active_tbl;1635 int flush_interval_passed = 0;1636 struct il_priv *il;1637 1638 il = lq_sta->drv;1639 active_tbl = lq_sta->active_tbl;1640 1641 tbl = &(lq_sta->lq_info[active_tbl]);1642 1643 /* If we've been disallowing search, see if we should now allow it */1644 if (lq_sta->stay_in_tbl) {1645 1646 /* Elapsed time using current modulation mode */1647 if (lq_sta->flush_timer)1648 flush_interval_passed =1649 time_after(jiffies,1650 (unsigned long)(lq_sta->flush_timer +1651 RATE_SCALE_FLUSH_INTVL));1652 1653 /*1654 * Check if we should allow search for new modulation mode.1655 * If many frames have failed or succeeded, or we've used1656 * this same modulation for a long time, allow search, and1657 * reset history stats that keep track of whether we should1658 * allow a new search. Also (below) reset all bitmaps and1659 * stats in active history.1660 */1661 if (force_search ||1662 lq_sta->total_failed > lq_sta->max_failure_limit ||1663 lq_sta->total_success > lq_sta->max_success_limit ||1664 (!lq_sta->search_better_tbl && lq_sta->flush_timer &&1665 flush_interval_passed)) {1666 D_RATE("LQ: stay is expired %d %d %d\n",1667 lq_sta->total_failed, lq_sta->total_success,1668 flush_interval_passed);1669 1670 /* Allow search for new mode */1671 lq_sta->stay_in_tbl = 0; /* only place reset */1672 lq_sta->total_failed = 0;1673 lq_sta->total_success = 0;1674 lq_sta->flush_timer = 0;1675 1676 /*1677 * Else if we've used this modulation mode enough repetitions1678 * (regardless of elapsed time or success/failure), reset1679 * history bitmaps and rate-specific stats for all rates in1680 * active table.1681 */1682 } else {1683 lq_sta->table_count++;1684 if (lq_sta->table_count >= lq_sta->table_count_limit) {1685 lq_sta->table_count = 0;1686 1687 D_RATE("LQ: stay in table clear win\n");1688 for (i = 0; i < RATE_COUNT; i++)1689 il4965_rs_rate_scale_clear_win(&1690 (tbl->1691 win1692 [i]));1693 }1694 }1695 1696 /* If transitioning to allow "search", reset all history1697 * bitmaps and stats in active table (this will become the new1698 * "search" table). */1699 if (!lq_sta->stay_in_tbl) {1700 for (i = 0; i < RATE_COUNT; i++)1701 il4965_rs_rate_scale_clear_win(&(tbl->win[i]));1702 }1703 }1704}1705 1706/*1707 * setup rate table in uCode1708 */1709static void1710il4965_rs_update_rate_tbl(struct il_priv *il, struct il_lq_sta *lq_sta,1711 struct il_scale_tbl_info *tbl, int idx, u8 is_green)1712{1713 u32 rate;1714 1715 /* Update uCode's rate table. */1716 rate = il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);1717 il4965_rs_fill_link_cmd(il, lq_sta, rate);1718 il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);1719}1720 1721/*1722 * Do rate scaling and search for new modulation mode.1723 */1724static void1725il4965_rs_rate_scale_perform(struct il_priv *il, struct sk_buff *skb,1726 struct ieee80211_sta *sta,1727 struct il_lq_sta *lq_sta)1728{1729 struct ieee80211_hw *hw = il->hw;1730 struct ieee80211_conf *conf = &hw->conf;1731 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);1732 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;1733 int low = RATE_INVALID;1734 int high = RATE_INVALID;1735 int idx;1736 int i;1737 struct il_rate_scale_data *win = NULL;1738 int current_tpt = IL_INVALID_VALUE;1739 int low_tpt = IL_INVALID_VALUE;1740 int high_tpt = IL_INVALID_VALUE;1741 u32 fail_count;1742 s8 scale_action = 0;1743 u16 rate_mask;1744 u8 update_lq = 0;1745 struct il_scale_tbl_info *tbl, *tbl1;1746 u16 rate_scale_idx_msk = 0;1747 u8 is_green = 0;1748 u8 active_tbl = 0;1749 u8 done_search = 0;1750 u16 high_low;1751 s32 sr;1752 u8 tid;1753 struct il_tid_data *tid_data;1754 1755 D_RATE("rate scale calculate new rate for skb\n");1756 1757 /* Send management frames and NO_ACK data using lowest rate. */1758 /* TODO: this could probably be improved.. */1759 if (!ieee80211_is_data(hdr->frame_control) ||1760 (info->flags & IEEE80211_TX_CTL_NO_ACK))1761 return;1762 1763 lq_sta->supp_rates = sta->deflink.supp_rates[lq_sta->band];1764 1765 tid = il4965_rs_tl_add_packet(lq_sta, hdr);1766 if (tid != MAX_TID_COUNT && (lq_sta->tx_agg_tid_en & (1 << tid))) {1767 tid_data = &il->stations[lq_sta->lq.sta_id].tid[tid];1768 if (tid_data->agg.state == IL_AGG_OFF)1769 lq_sta->is_agg = 0;1770 else1771 lq_sta->is_agg = 1;1772 } else1773 lq_sta->is_agg = 0;1774 1775 /*1776 * Select rate-scale / modulation-mode table to work with in1777 * the rest of this function: "search" if searching for better1778 * modulation mode, or "active" if doing rate scaling within a mode.1779 */1780 if (!lq_sta->search_better_tbl)1781 active_tbl = lq_sta->active_tbl;1782 else1783 active_tbl = 1 - lq_sta->active_tbl;1784 1785 tbl = &(lq_sta->lq_info[active_tbl]);1786 if (is_legacy(tbl->lq_type))1787 lq_sta->is_green = 0;1788 else1789 lq_sta->is_green = il4965_rs_use_green(il, sta);1790 is_green = lq_sta->is_green;1791 1792 /* current tx rate */1793 idx = lq_sta->last_txrate_idx;1794 1795 D_RATE("Rate scale idx %d for type %d\n", idx, tbl->lq_type);1796 1797 /* rates available for this association, and for modulation mode */1798 rate_mask = il4965_rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);1799 1800 D_RATE("mask 0x%04X\n", rate_mask);1801 1802 /* mask with station rate restriction */1803 if (is_legacy(tbl->lq_type)) {1804 if (lq_sta->band == NL80211_BAND_5GHZ)1805 /* supp_rates has no CCK bits in A mode */1806 rate_scale_idx_msk =1807 (u16) (rate_mask &1808 (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));1809 else1810 rate_scale_idx_msk =1811 (u16) (rate_mask & lq_sta->supp_rates);1812 1813 } else1814 rate_scale_idx_msk = rate_mask;1815 1816 if (!rate_scale_idx_msk)1817 rate_scale_idx_msk = rate_mask;1818 1819 if (!((1 << idx) & rate_scale_idx_msk)) {1820 IL_ERR("Current Rate is not valid\n");1821 if (lq_sta->search_better_tbl) {1822 /* revert to active table if search table is not valid */1823 tbl->lq_type = LQ_NONE;1824 lq_sta->search_better_tbl = 0;1825 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);1826 /* get "active" rate info */1827 idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);1828 il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx,1829 is_green);1830 }1831 return;1832 }1833 1834 /* Get expected throughput table and history win for current rate */1835 if (!tbl->expected_tpt) {1836 IL_ERR("tbl->expected_tpt is NULL\n");1837 return;1838 }1839 1840 /* force user max rate if set by user */1841 if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < idx) {1842 idx = lq_sta->max_rate_idx;1843 update_lq = 1;1844 win = &(tbl->win[idx]);1845 goto lq_update;1846 }1847 1848 win = &(tbl->win[idx]);1849 1850 /*1851 * If there is not enough history to calculate actual average1852 * throughput, keep analyzing results of more tx frames, without1853 * changing rate or mode (bypass most of the rest of this function).1854 * Set up new rate table in uCode only if old rate is not supported1855 * in current association (use new rate found above).1856 */1857 fail_count = win->counter - win->success_counter;1858 if (fail_count < RATE_MIN_FAILURE_TH &&1859 win->success_counter < RATE_MIN_SUCCESS_TH) {1860 D_RATE("LQ: still below TH. succ=%d total=%d " "for idx %d\n",1861 win->success_counter, win->counter, idx);1862 1863 /* Can't calculate this yet; not enough history */1864 win->average_tpt = IL_INVALID_VALUE;1865 1866 /* Should we stay with this modulation mode,1867 * or search for a new one? */1868 il4965_rs_stay_in_table(lq_sta, false);1869 1870 goto out;1871 }1872 /* Else we have enough samples; calculate estimate of1873 * actual average throughput */1874 if (win->average_tpt !=1875 ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128)) {1876 IL_ERR("expected_tpt should have been calculated by now\n");1877 win->average_tpt =1878 ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128);1879 }1880 1881 /* If we are searching for better modulation mode, check success. */1882 if (lq_sta->search_better_tbl) {1883 /* If good success, continue using the "search" mode;1884 * no need to send new link quality command, since we're1885 * continuing to use the setup that we've been trying. */1886 if (win->average_tpt > lq_sta->last_tpt) {1887 1888 D_RATE("LQ: SWITCHING TO NEW TBL "1889 "suc=%d cur-tpt=%d old-tpt=%d\n",1890 win->success_ratio, win->average_tpt,1891 lq_sta->last_tpt);1892 1893 if (!is_legacy(tbl->lq_type))1894 lq_sta->enable_counter = 1;1895 1896 /* Swap tables; "search" becomes "active" */1897 lq_sta->active_tbl = active_tbl;1898 current_tpt = win->average_tpt;1899 1900 /* Else poor success; go back to mode in "active" table */1901 } else {1902 1903 D_RATE("LQ: GOING BACK TO THE OLD TBL "1904 "suc=%d cur-tpt=%d old-tpt=%d\n",1905 win->success_ratio, win->average_tpt,1906 lq_sta->last_tpt);1907 1908 /* Nullify "search" table */1909 tbl->lq_type = LQ_NONE;1910 1911 /* Revert to "active" table */1912 active_tbl = lq_sta->active_tbl;1913 tbl = &(lq_sta->lq_info[active_tbl]);1914 1915 /* Revert to "active" rate and throughput info */1916 idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);1917 current_tpt = lq_sta->last_tpt;1918 1919 /* Need to set up a new rate table in uCode */1920 update_lq = 1;1921 }1922 1923 /* Either way, we've made a decision; modulation mode1924 * search is done, allow rate adjustment next time. */1925 lq_sta->search_better_tbl = 0;1926 done_search = 1; /* Don't switch modes below! */1927 goto lq_update;1928 }1929 1930 /* (Else) not in search of better modulation mode, try for better1931 * starting rate, while staying in this mode. */1932 high_low =1933 il4965_rs_get_adjacent_rate(il, idx, rate_scale_idx_msk,1934 tbl->lq_type);1935 low = high_low & 0xff;1936 high = (high_low >> 8) & 0xff;1937 1938 /* If user set max rate, dont allow higher than user constrain */1939 if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < high)1940 high = RATE_INVALID;1941 1942 sr = win->success_ratio;1943 1944 /* Collect measured throughputs for current and adjacent rates */1945 current_tpt = win->average_tpt;1946 if (low != RATE_INVALID)1947 low_tpt = tbl->win[low].average_tpt;1948 if (high != RATE_INVALID)1949 high_tpt = tbl->win[high].average_tpt;1950 1951 scale_action = 0;1952 1953 /* Too many failures, decrease rate */1954 if (sr <= RATE_DECREASE_TH || current_tpt == 0) {1955 D_RATE("decrease rate because of low success_ratio\n");1956 scale_action = -1;1957 1958 /* No throughput measured yet for adjacent rates; try increase. */1959 } else if (low_tpt == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) {1960 1961 if (high != RATE_INVALID && sr >= RATE_INCREASE_TH)1962 scale_action = 1;1963 else if (low != RATE_INVALID)1964 scale_action = 0;1965 }1966 1967 /* Both adjacent throughputs are measured, but neither one has better1968 * throughput; we're using the best rate, don't change it! */1969 else if (low_tpt != IL_INVALID_VALUE && high_tpt != IL_INVALID_VALUE &&1970 low_tpt < current_tpt && high_tpt < current_tpt)1971 scale_action = 0;1972 1973 /* At least one adjacent rate's throughput is measured,1974 * and may have better performance. */1975 else {1976 /* Higher adjacent rate's throughput is measured */1977 if (high_tpt != IL_INVALID_VALUE) {1978 /* Higher rate has better throughput */1979 if (high_tpt > current_tpt && sr >= RATE_INCREASE_TH)1980 scale_action = 1;1981 else1982 scale_action = 0;1983 1984 /* Lower adjacent rate's throughput is measured */1985 } else if (low_tpt != IL_INVALID_VALUE) {1986 /* Lower rate has better throughput */1987 if (low_tpt > current_tpt) {1988 D_RATE("decrease rate because of low tpt\n");1989 scale_action = -1;1990 } else if (sr >= RATE_INCREASE_TH) {1991 scale_action = 1;1992 }1993 }1994 }1995 1996 /* Sanity check; asked for decrease, but success rate or throughput1997 * has been good at old rate. Don't change it. */1998 if (scale_action == -1 && low != RATE_INVALID &&1999 (sr > RATE_HIGH_TH || current_tpt > 100 * tbl->expected_tpt[low]))2000 scale_action = 0;2001 2002 switch (scale_action) {2003 case -1:2004 /* Decrease starting rate, update uCode's rate table */2005 if (low != RATE_INVALID) {2006 update_lq = 1;2007 idx = low;2008 }2009 2010 break;2011 case 1:2012 /* Increase starting rate, update uCode's rate table */2013 if (high != RATE_INVALID) {2014 update_lq = 1;2015 idx = high;2016 }2017 2018 break;2019 case 0:2020 /* No change */2021 default:2022 break;2023 }2024 2025 D_RATE("choose rate scale idx %d action %d low %d " "high %d type %d\n",2026 idx, scale_action, low, high, tbl->lq_type);2027 2028lq_update:2029 /* Replace uCode's rate table for the destination station. */2030 if (update_lq)2031 il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx, is_green);2032 2033 /* Should we stay with this modulation mode,2034 * or search for a new one? */2035 il4965_rs_stay_in_table(lq_sta, false);2036 2037 /*2038 * Search for new modulation mode if we're:2039 * 1) Not changing rates right now2040 * 2) Not just finishing up a search2041 * 3) Allowing a new search2042 */2043 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && win->counter) {2044 /* Save current throughput to compare with "search" throughput */2045 lq_sta->last_tpt = current_tpt;2046 2047 /* Select a new "search" modulation mode to try.2048 * If one is found, set up the new "search" table. */2049 if (is_legacy(tbl->lq_type))2050 il4965_rs_move_legacy_other(il, lq_sta, conf, sta, idx);2051 else if (is_siso(tbl->lq_type))2052 il4965_rs_move_siso_to_other(il, lq_sta, conf, sta,2053 idx);2054 else /* (is_mimo2(tbl->lq_type)) */2055 il4965_rs_move_mimo2_to_other(il, lq_sta, conf, sta,2056 idx);2057 2058 /* If new "search" mode was selected, set up in uCode table */2059 if (lq_sta->search_better_tbl) {2060 /* Access the "search" table, clear its history. */2061 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);2062 for (i = 0; i < RATE_COUNT; i++)2063 il4965_rs_rate_scale_clear_win(&(tbl->win[i]));2064 2065 /* Use new "search" start rate */2066 idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);2067 2068 D_RATE("Switch current mcs: %X idx: %d\n",2069 tbl->current_rate, idx);2070 il4965_rs_fill_link_cmd(il, lq_sta, tbl->current_rate);2071 il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);2072 } else2073 done_search = 1;2074 }2075 2076 if (done_search && !lq_sta->stay_in_tbl) {2077 /* If the "active" (non-search) mode was legacy,2078 * and we've tried switching antennas,2079 * but we haven't been able to try HT modes (not available),2080 * stay with best antenna legacy modulation for a while2081 * before next round of mode comparisons. */2082 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);2083 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&2084 lq_sta->action_counter > tbl1->max_search) {2085 D_RATE("LQ: STAY in legacy table\n");2086 il4965_rs_set_stay_in_table(il, 1, lq_sta);2087 }2088 2089 /* If we're in an HT mode, and all 3 mode switch actions2090 * have been tried and compared, stay in this best modulation2091 * mode for a while before next round of mode comparisons. */2092 if (lq_sta->enable_counter &&2093 lq_sta->action_counter >= tbl1->max_search) {2094 if (lq_sta->last_tpt > IL_AGG_TPT_THREHOLD &&2095 (lq_sta->tx_agg_tid_en & (1 << tid)) &&2096 tid != MAX_TID_COUNT) {2097 tid_data =2098 &il->stations[lq_sta->lq.sta_id].tid[tid];2099 if (tid_data->agg.state == IL_AGG_OFF) {2100 D_RATE("try to aggregate tid %d\n",2101 tid);2102 il4965_rs_tl_turn_on_agg(il, tid,2103 lq_sta, sta);2104 }2105 }2106 il4965_rs_set_stay_in_table(il, 0, lq_sta);2107 }2108 }2109 2110out:2111 tbl->current_rate =2112 il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);2113 i = idx;2114 lq_sta->last_txrate_idx = i;2115}2116 2117/*2118 * il4965_rs_initialize_lq - Initialize a station's hardware rate table2119 *2120 * The uCode's station table contains a table of fallback rates2121 * for automatic fallback during transmission.2122 *2123 * NOTE: This sets up a default set of values. These will be replaced later2124 * if the driver's iwl-4965-rs rate scaling algorithm is used, instead of2125 * rc80211_simple.2126 *2127 * NOTE: Run C_ADD_STA command to set up station table entry, before2128 * calling this function (which runs C_TX_LINK_QUALITY_CMD,2129 * which requires station table entry to exist).2130 */2131static void2132il4965_rs_initialize_lq(struct il_priv *il, struct ieee80211_conf *conf,2133 struct ieee80211_sta *sta, struct il_lq_sta *lq_sta)2134{2135 struct il_scale_tbl_info *tbl;2136 int rate_idx;2137 int i;2138 u32 rate;2139 u8 use_green;2140 u8 active_tbl = 0;2141 u8 valid_tx_ant;2142 2143 if (!sta || !lq_sta)2144 return;2145 2146 use_green = il4965_rs_use_green(il, sta);2147 2148 i = lq_sta->last_txrate_idx;2149 2150 valid_tx_ant = il->hw_params.valid_tx_ant;2151 2152 if (!lq_sta->search_better_tbl)2153 active_tbl = lq_sta->active_tbl;2154 else2155 active_tbl = 1 - lq_sta->active_tbl;2156 2157 tbl = &(lq_sta->lq_info[active_tbl]);2158 2159 if (i < 0 || i >= RATE_COUNT)2160 i = 0;2161 2162 rate = il_rates[i].plcp;2163 tbl->ant_type = il4965_first_antenna(valid_tx_ant);2164 rate |= tbl->ant_type << RATE_MCS_ANT_POS;2165 2166 if (i >= IL_FIRST_CCK_RATE && i <= IL_LAST_CCK_RATE)2167 rate |= RATE_MCS_CCK_MSK;2168 2169 il4965_rs_get_tbl_info_from_mcs(rate, il->band, tbl, &rate_idx);2170 if (!il4965_rs_is_valid_ant(valid_tx_ant, tbl->ant_type))2171 il4965_rs_toggle_antenna(valid_tx_ant, &rate, tbl);2172 2173 rate = il4965_rate_n_flags_from_tbl(il, tbl, rate_idx, use_green);2174 tbl->current_rate = rate;2175 il4965_rs_set_expected_tpt_table(lq_sta, tbl);2176 il4965_rs_fill_link_cmd(NULL, lq_sta, rate);2177 il->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;2178 il_send_lq_cmd(il, &lq_sta->lq, CMD_SYNC, true);2179}2180 2181static void2182il4965_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta,2183 struct ieee80211_tx_rate_control *txrc)2184{2185 2186 struct sk_buff *skb = txrc->skb;2187 struct ieee80211_supported_band *sband = txrc->sband;2188 struct il_priv *il __maybe_unused = (struct il_priv *)il_r;2189 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);2190 struct il_lq_sta *lq_sta = il_sta;2191 int rate_idx;2192 2193 D_RATE("rate scale calculate new rate for skb\n");2194 2195 /* Get max rate if user set max rate */2196 if (lq_sta) {2197 lq_sta->max_rate_idx = fls(txrc->rate_idx_mask) - 1;2198 if (sband->band == NL80211_BAND_5GHZ &&2199 lq_sta->max_rate_idx != -1)2200 lq_sta->max_rate_idx += IL_FIRST_OFDM_RATE;2201 if (lq_sta->max_rate_idx < 0 ||2202 lq_sta->max_rate_idx >= RATE_COUNT)2203 lq_sta->max_rate_idx = -1;2204 }2205 2206 /* Treat uninitialized rate scaling data same as non-existing. */2207 if (lq_sta && !lq_sta->drv) {2208 D_RATE("Rate scaling not initialized yet.\n");2209 il_sta = NULL;2210 }2211 2212 if (!lq_sta)2213 return;2214 2215 rate_idx = lq_sta->last_txrate_idx;2216 2217 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {2218 rate_idx -= IL_FIRST_OFDM_RATE;2219 /* 6M and 9M shared same MCS idx */2220 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;2221 if (il4965_rs_extract_rate(lq_sta->last_rate_n_flags) >=2222 RATE_MIMO2_6M_PLCP)2223 rate_idx = rate_idx + MCS_IDX_PER_STREAM;2224 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;2225 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)2226 info->control.rates[0].flags |=2227 IEEE80211_TX_RC_SHORT_GI;2228 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)2229 info->control.rates[0].flags |=2230 IEEE80211_TX_RC_DUP_DATA;2231 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)2232 info->control.rates[0].flags |=2233 IEEE80211_TX_RC_40_MHZ_WIDTH;2234 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)2235 info->control.rates[0].flags |=2236 IEEE80211_TX_RC_GREEN_FIELD;2237 } else {2238 /* Check for invalid rates */2239 if (rate_idx < 0 || rate_idx >= RATE_COUNT_LEGACY ||2240 (sband->band == NL80211_BAND_5GHZ &&2241 rate_idx < IL_FIRST_OFDM_RATE))2242 rate_idx = rate_lowest_index(sband, sta);2243 /* On valid 5 GHz rate, adjust idx */2244 else if (sband->band == NL80211_BAND_5GHZ)2245 rate_idx -= IL_FIRST_OFDM_RATE;2246 info->control.rates[0].flags = 0;2247 }2248 info->control.rates[0].idx = rate_idx;2249 info->control.rates[0].count = 1;2250}2251 2252static void *2253il4965_rs_alloc_sta(void *il_rate, struct ieee80211_sta *sta, gfp_t gfp)2254{2255 struct il_station_priv *sta_priv =2256 (struct il_station_priv *)sta->drv_priv;2257 struct il_priv *il;2258 2259 il = (struct il_priv *)il_rate;2260 D_RATE("create station rate scale win\n");2261 2262 return &sta_priv->lq_sta;2263}2264 2265/*2266 * Called after adding a new station to initialize rate scaling2267 */2268void2269il4965_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id)2270{2271 int i, j;2272 struct ieee80211_hw *hw = il->hw;2273 struct ieee80211_conf *conf = &il->hw->conf;2274 struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;2275 struct il_station_priv *sta_priv;2276 struct il_lq_sta *lq_sta;2277 struct ieee80211_supported_band *sband;2278 2279 sta_priv = (struct il_station_priv *)sta->drv_priv;2280 lq_sta = &sta_priv->lq_sta;2281 sband = hw->wiphy->bands[conf->chandef.chan->band];2282 2283 lq_sta->lq.sta_id = sta_id;2284 2285 for (j = 0; j < LQ_SIZE; j++)2286 for (i = 0; i < RATE_COUNT; i++)2287 il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].2288 win[i]);2289 2290 lq_sta->flush_timer = 0;2291 lq_sta->supp_rates = sta->deflink.supp_rates[sband->band];2292 for (j = 0; j < LQ_SIZE; j++)2293 for (i = 0; i < RATE_COUNT; i++)2294 il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].2295 win[i]);2296 2297 D_RATE("LQ:" "*** rate scale station global init for station %d ***\n",2298 sta_id);2299 /* TODO: what is a good starting rate for STA? About middle? Maybe not2300 * the lowest or the highest rate.. Could consider using RSSI from2301 * previous packets? Need to have IEEE 802.1X auth succeed immediately2302 * after assoc.. */2303 2304 lq_sta->is_dup = 0;2305 lq_sta->max_rate_idx = -1;2306 lq_sta->missed_rate_counter = IL_MISSED_RATE_MAX;2307 lq_sta->is_green = il4965_rs_use_green(il, sta);2308 lq_sta->active_legacy_rate = il->active_rate & ~(0x1000);2309 lq_sta->band = il->band;2310 /*2311 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),2312 * supp_rates[] does not; shift to convert format, force 9 MBits off.2313 */2314 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;2315 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;2316 lq_sta->active_siso_rate &= ~((u16) 0x2);2317 lq_sta->active_siso_rate <<= IL_FIRST_OFDM_RATE;2318 2319 /* Same here */2320 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;2321 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;2322 lq_sta->active_mimo2_rate &= ~((u16) 0x2);2323 lq_sta->active_mimo2_rate <<= IL_FIRST_OFDM_RATE;2324 2325 /* These values will be overridden later */2326 lq_sta->lq.general_params.single_stream_ant_msk =2327 il4965_first_antenna(il->hw_params.valid_tx_ant);2328 lq_sta->lq.general_params.dual_stream_ant_msk =2329 il->hw_params.valid_tx_ant & ~il4965_first_antenna(il->hw_params.2330 valid_tx_ant);2331 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {2332 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;2333 } else if (il4965_num_of_ant(il->hw_params.valid_tx_ant) == 2) {2334 lq_sta->lq.general_params.dual_stream_ant_msk =2335 il->hw_params.valid_tx_ant;2336 }2337 2338 /* as default allow aggregation for all tids */2339 lq_sta->tx_agg_tid_en = IL_AGG_ALL_TID;2340 lq_sta->drv = il;2341 2342 /* Set last_txrate_idx to lowest rate */2343 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);2344 if (sband->band == NL80211_BAND_5GHZ)2345 lq_sta->last_txrate_idx += IL_FIRST_OFDM_RATE;2346 lq_sta->is_agg = 0;2347 2348#ifdef CONFIG_MAC80211_DEBUGFS2349 lq_sta->dbg_fixed_rate = 0;2350#endif2351 2352 il4965_rs_initialize_lq(il, conf, sta, lq_sta);2353}2354 2355static void2356il4965_rs_fill_link_cmd(struct il_priv *il, struct il_lq_sta *lq_sta,2357 u32 new_rate)2358{2359 struct il_scale_tbl_info tbl_type;2360 int idx = 0;2361 int rate_idx;2362 int repeat_rate = 0;2363 u8 ant_toggle_cnt = 0;2364 u8 use_ht_possible = 1;2365 u8 valid_tx_ant = 0;2366 struct il_link_quality_cmd *lq_cmd = &lq_sta->lq;2367 2368 /* Override starting rate (idx 0) if needed for debug purposes */2369 il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);2370 2371 /* Interpret new_rate (rate_n_flags) */2372 il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,2373 &rate_idx);2374 2375 /* How many times should we repeat the initial rate? */2376 if (is_legacy(tbl_type.lq_type)) {2377 ant_toggle_cnt = 1;2378 repeat_rate = IL_NUMBER_TRY;2379 } else {2380 repeat_rate = IL_HT_NUMBER_TRY;2381 }2382 2383 lq_cmd->general_params.mimo_delimiter =2384 is_mimo(tbl_type.lq_type) ? 1 : 0;2385 2386 /* Fill 1st table entry (idx 0) */2387 lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);2388 2389 if (il4965_num_of_ant(tbl_type.ant_type) == 1) {2390 lq_cmd->general_params.single_stream_ant_msk =2391 tbl_type.ant_type;2392 } else if (il4965_num_of_ant(tbl_type.ant_type) == 2) {2393 lq_cmd->general_params.dual_stream_ant_msk = tbl_type.ant_type;2394 }2395 /* otherwise we don't modify the existing value */2396 idx++;2397 repeat_rate--;2398 if (il)2399 valid_tx_ant = il->hw_params.valid_tx_ant;2400 2401 /* Fill rest of rate table */2402 while (idx < LINK_QUAL_MAX_RETRY_NUM) {2403 /* Repeat initial/next rate.2404 * For legacy IL_NUMBER_TRY == 1, this loop will not execute.2405 * For HT IL_HT_NUMBER_TRY == 3, this executes twice. */2406 while (repeat_rate > 0 && idx < (LINK_QUAL_MAX_RETRY_NUM - 1)) {2407 if (is_legacy(tbl_type.lq_type)) {2408 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)2409 ant_toggle_cnt++;2410 else if (il &&2411 il4965_rs_toggle_antenna(valid_tx_ant,2412 &new_rate,2413 &tbl_type))2414 ant_toggle_cnt = 1;2415 }2416 2417 /* Override next rate if needed for debug purposes */2418 il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);2419 2420 /* Fill next table entry */2421 lq_cmd->rs_table[idx].rate_n_flags =2422 cpu_to_le32(new_rate);2423 repeat_rate--;2424 idx++;2425 }2426 2427 il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,2428 &tbl_type, &rate_idx);2429 2430 /* Indicate to uCode which entries might be MIMO.2431 * If initial rate was MIMO, this will finally end up2432 * as (IL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */2433 if (is_mimo(tbl_type.lq_type))2434 lq_cmd->general_params.mimo_delimiter = idx;2435 2436 /* Get next rate */2437 new_rate =2438 il4965_rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,2439 use_ht_possible);2440 2441 /* How many times should we repeat the next rate? */2442 if (is_legacy(tbl_type.lq_type)) {2443 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)2444 ant_toggle_cnt++;2445 else if (il &&2446 il4965_rs_toggle_antenna(valid_tx_ant,2447 &new_rate, &tbl_type))2448 ant_toggle_cnt = 1;2449 2450 repeat_rate = IL_NUMBER_TRY;2451 } else {2452 repeat_rate = IL_HT_NUMBER_TRY;2453 }2454 2455 /* Don't allow HT rates after next pass.2456 * il4965_rs_get_lower_rate() will change type to LQ_A or LQ_G. */2457 use_ht_possible = 0;2458 2459 /* Override next rate if needed for debug purposes */2460 il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);2461 2462 /* Fill next table entry */2463 lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);2464 2465 idx++;2466 repeat_rate--;2467 }2468 2469 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;2470 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;2471 2472 lq_cmd->agg_params.agg_time_limit =2473 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);2474}2475 2476static void *2477il4965_rs_alloc(struct ieee80211_hw *hw)2478{2479 return hw->priv;2480}2481 2482/* rate scale requires free function to be implemented */2483static void2484il4965_rs_free(void *il_rate)2485{2486 return;2487}2488 2489static void2490il4965_rs_free_sta(void *il_r, struct ieee80211_sta *sta, void *il_sta)2491{2492 struct il_priv *il __maybe_unused = il_r;2493 2494 D_RATE("enter\n");2495 D_RATE("leave\n");2496}2497 2498#ifdef CONFIG_MAC80211_DEBUGFS2499 2500static void2501il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)2502{2503 struct il_priv *il;2504 u8 valid_tx_ant;2505 u8 ant_sel_tx;2506 2507 il = lq_sta->drv;2508 valid_tx_ant = il->hw_params.valid_tx_ant;2509 if (lq_sta->dbg_fixed_rate) {2510 ant_sel_tx =2511 ((lq_sta->2512 dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) >>2513 RATE_MCS_ANT_POS);2514 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {2515 *rate_n_flags = lq_sta->dbg_fixed_rate;2516 D_RATE("Fixed rate ON\n");2517 } else {2518 lq_sta->dbg_fixed_rate = 0;2519 IL_ERR2520 ("Invalid antenna selection 0x%X, Valid is 0x%X\n",2521 ant_sel_tx, valid_tx_ant);2522 D_RATE("Fixed rate OFF\n");2523 }2524 } else {2525 D_RATE("Fixed rate OFF\n");2526 }2527}2528 2529static ssize_t2530il4965_rs_sta_dbgfs_scale_table_write(struct file *file,2531 const char __user *user_buf,2532 size_t count, loff_t *ppos)2533{2534 struct il_lq_sta *lq_sta = file->private_data;2535 struct il_priv *il;2536 char buf[64];2537 size_t buf_size;2538 u32 parsed_rate;2539 2540 il = lq_sta->drv;2541 memset(buf, 0, sizeof(buf));2542 buf_size = min(count, sizeof(buf) - 1);2543 if (copy_from_user(buf, user_buf, buf_size))2544 return -EFAULT;2545 2546 if (sscanf(buf, "%x", &parsed_rate) == 1)2547 lq_sta->dbg_fixed_rate = parsed_rate;2548 else2549 lq_sta->dbg_fixed_rate = 0;2550 2551 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */2552 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */2553 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */2554 2555 D_RATE("sta_id %d rate 0x%X\n", lq_sta->lq.sta_id,2556 lq_sta->dbg_fixed_rate);2557 2558 if (lq_sta->dbg_fixed_rate) {2559 il4965_rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);2560 il_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);2561 }2562 2563 return count;2564}2565 2566static ssize_t2567il4965_rs_sta_dbgfs_scale_table_read(struct file *file, char __user *user_buf,2568 size_t count, loff_t *ppos)2569{2570 char *buff;2571 int desc = 0;2572 int i = 0;2573 int idx = 0;2574 ssize_t ret;2575 2576 struct il_lq_sta *lq_sta = file->private_data;2577 struct il_priv *il;2578 struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);2579 2580 il = lq_sta->drv;2581 buff = kmalloc(1024, GFP_KERNEL);2582 if (!buff)2583 return -ENOMEM;2584 2585 desc += sprintf(buff + desc, "sta_id %d\n", lq_sta->lq.sta_id);2586 desc +=2587 sprintf(buff + desc, "failed=%d success=%d rate=0%X\n",2588 lq_sta->total_failed, lq_sta->total_success,2589 lq_sta->active_legacy_rate);2590 desc +=2591 sprintf(buff + desc, "fixed rate 0x%X\n", lq_sta->dbg_fixed_rate);2592 desc +=2593 sprintf(buff + desc, "valid_tx_ant %s%s%s\n",2594 (il->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",2595 (il->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",2596 (il->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");2597 desc +=2598 sprintf(buff + desc, "lq type %s\n",2599 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");2600 if (is_Ht(tbl->lq_type)) {2601 desc +=2602 sprintf(buff + desc, " %s",2603 (is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");2604 desc +=2605 sprintf(buff + desc, " %s",2606 (tbl->is_ht40) ? "40MHz" : "20MHz");2607 desc +=2608 sprintf(buff + desc, " %s %s %s\n",2609 (tbl->is_SGI) ? "SGI" : "",2610 (lq_sta->is_green) ? "GF enabled" : "",2611 (lq_sta->is_agg) ? "AGG on" : "");2612 }2613 desc +=2614 sprintf(buff + desc, "last tx rate=0x%X\n",2615 lq_sta->last_rate_n_flags);2616 desc +=2617 sprintf(buff + desc,2618 "general:" "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",2619 lq_sta->lq.general_params.flags,2620 lq_sta->lq.general_params.mimo_delimiter,2621 lq_sta->lq.general_params.single_stream_ant_msk,2622 lq_sta->lq.general_params.dual_stream_ant_msk);2623 2624 desc +=2625 sprintf(buff + desc,2626 "agg:"2627 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",2628 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),2629 lq_sta->lq.agg_params.agg_dis_start_th,2630 lq_sta->lq.agg_params.agg_frame_cnt_limit);2631 2632 desc +=2633 sprintf(buff + desc,2634 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",2635 lq_sta->lq.general_params.start_rate_idx[0],2636 lq_sta->lq.general_params.start_rate_idx[1],2637 lq_sta->lq.general_params.start_rate_idx[2],2638 lq_sta->lq.general_params.start_rate_idx[3]);2639 2640 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {2641 idx =2642 il4965_hwrate_to_plcp_idx(le32_to_cpu2643 (lq_sta->lq.rs_table[i].2644 rate_n_flags));2645 if (is_legacy(tbl->lq_type)) {2646 desc +=2647 sprintf(buff + desc, " rate[%d] 0x%X %smbps\n", i,2648 le32_to_cpu(lq_sta->lq.rs_table[i].2649 rate_n_flags),2650 il_rate_mcs[idx].mbps);2651 } else {2652 desc +=2653 sprintf(buff + desc, " rate[%d] 0x%X %smbps (%s)\n",2654 i,2655 le32_to_cpu(lq_sta->lq.rs_table[i].2656 rate_n_flags),2657 il_rate_mcs[idx].mbps,2658 il_rate_mcs[idx].mcs);2659 }2660 }2661 2662 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);2663 kfree(buff);2664 return ret;2665}2666 2667static const struct file_operations rs_sta_dbgfs_scale_table_ops = {2668 .write = il4965_rs_sta_dbgfs_scale_table_write,2669 .read = il4965_rs_sta_dbgfs_scale_table_read,2670 .open = simple_open,2671 .llseek = default_llseek,2672};2673 2674static ssize_t2675il4965_rs_sta_dbgfs_stats_table_read(struct file *file, char __user *user_buf,2676 size_t count, loff_t *ppos)2677{2678 char *buff;2679 int desc = 0;2680 int i, j;2681 ssize_t ret;2682 2683 struct il_lq_sta *lq_sta = file->private_data;2684 2685 buff = kmalloc(1024, GFP_KERNEL);2686 if (!buff)2687 return -ENOMEM;2688 2689 for (i = 0; i < LQ_SIZE; i++) {2690 desc +=2691 sprintf(buff + desc,2692 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"2693 "rate=0x%X\n", lq_sta->active_tbl == i ? "*" : "x",2694 lq_sta->lq_info[i].lq_type,2695 lq_sta->lq_info[i].is_SGI,2696 lq_sta->lq_info[i].is_ht40,2697 lq_sta->lq_info[i].is_dup, lq_sta->is_green,2698 lq_sta->lq_info[i].current_rate);2699 for (j = 0; j < RATE_COUNT; j++) {2700 desc +=2701 sprintf(buff + desc,2702 "counter=%d success=%d %%=%d\n",2703 lq_sta->lq_info[i].win[j].counter,2704 lq_sta->lq_info[i].win[j].success_counter,2705 lq_sta->lq_info[i].win[j].success_ratio);2706 }2707 }2708 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);2709 kfree(buff);2710 return ret;2711}2712 2713static const struct file_operations rs_sta_dbgfs_stats_table_ops = {2714 .read = il4965_rs_sta_dbgfs_stats_table_read,2715 .open = simple_open,2716 .llseek = default_llseek,2717};2718 2719static ssize_t2720il4965_rs_sta_dbgfs_rate_scale_data_read(struct file *file,2721 char __user *user_buf, size_t count,2722 loff_t *ppos)2723{2724 char buff[120];2725 int desc = 0;2726 struct il_lq_sta *lq_sta = file->private_data;2727 struct il_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];2728 2729 if (is_Ht(tbl->lq_type))2730 desc +=2731 sprintf(buff + desc, "Bit Rate= %d Mb/s\n",2732 tbl->expected_tpt[lq_sta->last_txrate_idx]);2733 else2734 desc +=2735 sprintf(buff + desc, "Bit Rate= %d Mb/s\n",2736 il_rates[lq_sta->last_txrate_idx].ieee >> 1);2737 2738 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);2739}2740 2741static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {2742 .read = il4965_rs_sta_dbgfs_rate_scale_data_read,2743 .open = simple_open,2744 .llseek = default_llseek,2745};2746 2747static void2748il4965_rs_add_debugfs(void *il, void *il_sta, struct dentry *dir)2749{2750 struct il_lq_sta *lq_sta = il_sta;2751 2752 debugfs_create_file("rate_scale_table", 0600, dir, lq_sta,2753 &rs_sta_dbgfs_scale_table_ops);2754 debugfs_create_file("rate_stats_table", 0400, dir, lq_sta,2755 &rs_sta_dbgfs_stats_table_ops);2756 debugfs_create_file("rate_scale_data", 0400, dir, lq_sta,2757 &rs_sta_dbgfs_rate_scale_data_ops);2758 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,2759 &lq_sta->tx_agg_tid_en);2760}2761#endif2762 2763/*2764 * Initialization of rate scaling information is done by driver after2765 * the station is added. Since mac80211 calls this function before a2766 * station is added we ignore it.2767 */2768static void2769il4965_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband,2770 struct cfg80211_chan_def *chandef,2771 struct ieee80211_sta *sta, void *il_sta)2772{2773}2774 2775static const struct rate_control_ops rs_4965_ops = {2776 .name = IL4965_RS_NAME,2777 .tx_status = il4965_rs_tx_status,2778 .get_rate = il4965_rs_get_rate,2779 .rate_init = il4965_rs_rate_init_stub,2780 .alloc = il4965_rs_alloc,2781 .free = il4965_rs_free,2782 .alloc_sta = il4965_rs_alloc_sta,2783 .free_sta = il4965_rs_free_sta,2784#ifdef CONFIG_MAC80211_DEBUGFS2785 .add_sta_debugfs = il4965_rs_add_debugfs,2786#endif2787};2788 2789int2790il4965_rate_control_register(void)2791{2792 return ieee80211_rate_control_register(&rs_4965_ops);2793}2794 2795void2796il4965_rate_control_unregister(void)2797{2798 ieee80211_rate_control_unregister(&rs_4965_ops);2799}2800