| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (C) 2010-2013 Felix Fietkau <nbd@openwrt.org> |
| * Copyright (C) 2019-2020 Intel Corporation |
| */ |
| #include <linux/netdevice.h> |
| #include <linux/types.h> |
| #include <linux/skbuff.h> |
| #include <linux/debugfs.h> |
| #include <linux/random.h> |
| #include <linux/moduleparam.h> |
| #include <linux/ieee80211.h> |
| #include <net/mac80211.h> |
| #include "rate.h" |
| #include "sta_info.h" |
| #include "rc80211_minstrel_ht.h" |
| |
| #define AVG_AMPDU_SIZE 16 |
| #define AVG_PKT_SIZE 1200 |
| |
| #define SAMPLE_SWITCH_THR 100 |
| |
| /* Number of bits for an average sized packet */ |
| #define MCS_NBITS ((AVG_PKT_SIZE * AVG_AMPDU_SIZE) << 3) |
| |
| /* Number of symbols for a packet with (bps) bits per symbol */ |
| #define MCS_NSYMS(bps) DIV_ROUND_UP(MCS_NBITS, (bps)) |
| |
| /* Transmission time (nanoseconds) for a packet containing (syms) symbols */ |
| #define MCS_SYMBOL_TIME(sgi, syms) \ |
| (sgi ? \ |
| ((syms) * 18000 + 4000) / 5 : /* syms * 3.6 us */ \ |
| ((syms) * 1000) << 2 /* syms * 4 us */ \ |
| ) |
| |
| /* Transmit duration for the raw data part of an average sized packet */ |
| #define MCS_DURATION(streams, sgi, bps) \ |
| (MCS_SYMBOL_TIME(sgi, MCS_NSYMS((streams) * (bps))) / AVG_AMPDU_SIZE) |
| |
| #define BW_20 0 |
| #define BW_40 1 |
| #define BW_80 2 |
| |
| /* |
| * Define group sort order: HT40 -> SGI -> #streams |
| */ |
| #define GROUP_IDX(_streams, _sgi, _ht40) \ |
| MINSTREL_HT_GROUP_0 + \ |
| MINSTREL_MAX_STREAMS * 2 * _ht40 + \ |
| MINSTREL_MAX_STREAMS * _sgi + \ |
| _streams - 1 |
| |
| #define _MAX(a, b) (((a)>(b))?(a):(b)) |
| |
| #define GROUP_SHIFT(duration) \ |
| _MAX(0, 16 - __builtin_clz(duration)) |
| |
| /* MCS rate information for an MCS group */ |
| #define __MCS_GROUP(_streams, _sgi, _ht40, _s) \ |
| [GROUP_IDX(_streams, _sgi, _ht40)] = { \ |
| .streams = _streams, \ |
| .shift = _s, \ |
| .bw = _ht40, \ |
| .flags = \ |
| IEEE80211_TX_RC_MCS | \ |
| (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \ |
| (_ht40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \ |
| .duration = { \ |
| MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26) >> _s, \ |
| MCS_DURATION(_streams, _sgi, _ht40 ? 108 : 52) >> _s, \ |
| MCS_DURATION(_streams, _sgi, _ht40 ? 162 : 78) >> _s, \ |
| MCS_DURATION(_streams, _sgi, _ht40 ? 216 : 104) >> _s, \ |
| MCS_DURATION(_streams, _sgi, _ht40 ? 324 : 156) >> _s, \ |
| MCS_DURATION(_streams, _sgi, _ht40 ? 432 : 208) >> _s, \ |
| MCS_DURATION(_streams, _sgi, _ht40 ? 486 : 234) >> _s, \ |
| MCS_DURATION(_streams, _sgi, _ht40 ? 540 : 260) >> _s \ |
| } \ |
| } |
| |
| #define MCS_GROUP_SHIFT(_streams, _sgi, _ht40) \ |
| GROUP_SHIFT(MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26)) |
| |
| #define MCS_GROUP(_streams, _sgi, _ht40) \ |
| __MCS_GROUP(_streams, _sgi, _ht40, \ |
| MCS_GROUP_SHIFT(_streams, _sgi, _ht40)) |
| |
| #define VHT_GROUP_IDX(_streams, _sgi, _bw) \ |
| (MINSTREL_VHT_GROUP_0 + \ |
| MINSTREL_MAX_STREAMS * 2 * (_bw) + \ |
| MINSTREL_MAX_STREAMS * (_sgi) + \ |
| (_streams) - 1) |
| |
| #define BW2VBPS(_bw, r3, r2, r1) \ |
| (_bw == BW_80 ? r3 : _bw == BW_40 ? r2 : r1) |
| |
| #define __VHT_GROUP(_streams, _sgi, _bw, _s) \ |
| [VHT_GROUP_IDX(_streams, _sgi, _bw)] = { \ |
| .streams = _streams, \ |
| .shift = _s, \ |
| .bw = _bw, \ |
| .flags = \ |
| IEEE80211_TX_RC_VHT_MCS | \ |
| (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \ |
| (_bw == BW_80 ? IEEE80211_TX_RC_80_MHZ_WIDTH : \ |
| _bw == BW_40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \ |
| .duration = { \ |
| MCS_DURATION(_streams, _sgi, \ |
| BW2VBPS(_bw, 117, 54, 26)) >> _s, \ |
| MCS_DURATION(_streams, _sgi, \ |
| BW2VBPS(_bw, 234, 108, 52)) >> _s, \ |
| MCS_DURATION(_streams, _sgi, \ |
| BW2VBPS(_bw, 351, 162, 78)) >> _s, \ |
| MCS_DURATION(_streams, _sgi, \ |
| BW2VBPS(_bw, 468, 216, 104)) >> _s, \ |
| MCS_DURATION(_streams, _sgi, \ |
| BW2VBPS(_bw, 702, 324, 156)) >> _s, \ |
| MCS_DURATION(_streams, _sgi, \ |
| BW2VBPS(_bw, 936, 432, 208)) >> _s, \ |
| MCS_DURATION(_streams, _sgi, \ |
| BW2VBPS(_bw, 1053, 486, 234)) >> _s, \ |
| MCS_DURATION(_streams, _sgi, \ |
| BW2VBPS(_bw, 1170, 540, 260)) >> _s, \ |
| MCS_DURATION(_streams, _sgi, \ |
| BW2VBPS(_bw, 1404, 648, 312)) >> _s, \ |
| MCS_DURATION(_streams, _sgi, \ |
| BW2VBPS(_bw, 1560, 720, 346)) >> _s \ |
| } \ |
| } |
| |
| #define VHT_GROUP_SHIFT(_streams, _sgi, _bw) \ |
| GROUP_SHIFT(MCS_DURATION(_streams, _sgi, \ |
| BW2VBPS(_bw, 117, 54, 26))) |
| |
| #define VHT_GROUP(_streams, _sgi, _bw) \ |
| __VHT_GROUP(_streams, _sgi, _bw, \ |
| VHT_GROUP_SHIFT(_streams, _sgi, _bw)) |
| |
| #define CCK_DURATION(_bitrate, _short) \ |
| (1000 * (10 /* SIFS */ + \ |
| (_short ? 72 + 24 : 144 + 48) + \ |
| (8 * (AVG_PKT_SIZE + 4) * 10) / (_bitrate))) |
| |
| #define CCK_DURATION_LIST(_short, _s) \ |
| CCK_DURATION(10, _short) >> _s, \ |
| CCK_DURATION(20, _short) >> _s, \ |
| CCK_DURATION(55, _short) >> _s, \ |
| CCK_DURATION(110, _short) >> _s |
| |
| #define __CCK_GROUP(_s) \ |
| [MINSTREL_CCK_GROUP] = { \ |
| .streams = 1, \ |
| .flags = 0, \ |
| .shift = _s, \ |
| .duration = { \ |
| CCK_DURATION_LIST(false, _s), \ |
| CCK_DURATION_LIST(true, _s) \ |
| } \ |
| } |
| |
| #define CCK_GROUP_SHIFT \ |
| GROUP_SHIFT(CCK_DURATION(10, false)) |
| |
| #define CCK_GROUP __CCK_GROUP(CCK_GROUP_SHIFT) |
| |
| #define OFDM_DURATION(_bitrate) \ |
| (1000 * (16 /* SIFS + signal ext */ + \ |
| 16 /* T_PREAMBLE */ + \ |
| 4 /* T_SIGNAL */ + \ |
| 4 * (((16 + 80 * (AVG_PKT_SIZE + 4) + 6) / \ |
| ((_bitrate) * 4))))) |
| |
| #define OFDM_DURATION_LIST(_s) \ |
| OFDM_DURATION(60) >> _s, \ |
| OFDM_DURATION(90) >> _s, \ |
| OFDM_DURATION(120) >> _s, \ |
| OFDM_DURATION(180) >> _s, \ |
| OFDM_DURATION(240) >> _s, \ |
| OFDM_DURATION(360) >> _s, \ |
| OFDM_DURATION(480) >> _s, \ |
| OFDM_DURATION(540) >> _s |
| |
| #define __OFDM_GROUP(_s) \ |
| [MINSTREL_OFDM_GROUP] = { \ |
| .streams = 1, \ |
| .flags = 0, \ |
| .shift = _s, \ |
| .duration = { \ |
| OFDM_DURATION_LIST(_s), \ |
| } \ |
| } |
| |
| #define OFDM_GROUP_SHIFT \ |
| GROUP_SHIFT(OFDM_DURATION(60)) |
| |
| #define OFDM_GROUP __OFDM_GROUP(OFDM_GROUP_SHIFT) |
| |
| |
| static bool minstrel_vht_only = true; |
| module_param(minstrel_vht_only, bool, 0644); |
| MODULE_PARM_DESC(minstrel_vht_only, |
| "Use only VHT rates when VHT is supported by sta."); |
| |
| /* |
| * To enable sufficiently targeted rate sampling, MCS rates are divided into |
| * groups, based on the number of streams and flags (HT40, SGI) that they |
| * use. |
| * |
| * Sortorder has to be fixed for GROUP_IDX macro to be applicable: |
| * BW -> SGI -> #streams |
| */ |
| const struct mcs_group minstrel_mcs_groups[] = { |
| MCS_GROUP(1, 0, BW_20), |
| MCS_GROUP(2, 0, BW_20), |
| MCS_GROUP(3, 0, BW_20), |
| MCS_GROUP(4, 0, BW_20), |
| |
| MCS_GROUP(1, 1, BW_20), |
| MCS_GROUP(2, 1, BW_20), |
| MCS_GROUP(3, 1, BW_20), |
| MCS_GROUP(4, 1, BW_20), |
| |
| MCS_GROUP(1, 0, BW_40), |
| MCS_GROUP(2, 0, BW_40), |
| MCS_GROUP(3, 0, BW_40), |
| MCS_GROUP(4, 0, BW_40), |
| |
| MCS_GROUP(1, 1, BW_40), |
| MCS_GROUP(2, 1, BW_40), |
| MCS_GROUP(3, 1, BW_40), |
| MCS_GROUP(4, 1, BW_40), |
| |
| CCK_GROUP, |
| OFDM_GROUP, |
| |
| VHT_GROUP(1, 0, BW_20), |
| VHT_GROUP(2, 0, BW_20), |
| VHT_GROUP(3, 0, BW_20), |
| VHT_GROUP(4, 0, BW_20), |
| |
| VHT_GROUP(1, 1, BW_20), |
| VHT_GROUP(2, 1, BW_20), |
| VHT_GROUP(3, 1, BW_20), |
| VHT_GROUP(4, 1, BW_20), |
| |
| VHT_GROUP(1, 0, BW_40), |
| VHT_GROUP(2, 0, BW_40), |
| VHT_GROUP(3, 0, BW_40), |
| VHT_GROUP(4, 0, BW_40), |
| |
| VHT_GROUP(1, 1, BW_40), |
| VHT_GROUP(2, 1, BW_40), |
| VHT_GROUP(3, 1, BW_40), |
| VHT_GROUP(4, 1, BW_40), |
| |
| VHT_GROUP(1, 0, BW_80), |
| VHT_GROUP(2, 0, BW_80), |
| VHT_GROUP(3, 0, BW_80), |
| VHT_GROUP(4, 0, BW_80), |
| |
| VHT_GROUP(1, 1, BW_80), |
| VHT_GROUP(2, 1, BW_80), |
| VHT_GROUP(3, 1, BW_80), |
| VHT_GROUP(4, 1, BW_80), |
| }; |
| |
| const s16 minstrel_cck_bitrates[4] = { 10, 20, 55, 110 }; |
| const s16 minstrel_ofdm_bitrates[8] = { 60, 90, 120, 180, 240, 360, 480, 540 }; |
| static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES] __read_mostly; |
| static const u8 minstrel_sample_seq[] = { |
| MINSTREL_SAMPLE_TYPE_INC, |
| MINSTREL_SAMPLE_TYPE_JUMP, |
| MINSTREL_SAMPLE_TYPE_INC, |
| MINSTREL_SAMPLE_TYPE_JUMP, |
| MINSTREL_SAMPLE_TYPE_INC, |
| MINSTREL_SAMPLE_TYPE_SLOW, |
| }; |
| |
| static void |
| minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi); |
| |
| /* |
| * Some VHT MCSes are invalid (when Ndbps / Nes is not an integer) |
| * e.g for MCS9@20MHzx1Nss: Ndbps=8x52*(5/6) Nes=1 |
| * |
| * Returns the valid mcs map for struct minstrel_mcs_group_data.supported |
| */ |
| static u16 |
| minstrel_get_valid_vht_rates(int bw, int nss, __le16 mcs_map) |
| { |
| u16 mask = 0; |
| |
| if (bw == BW_20) { |
| if (nss != 3 && nss != 6) |
| mask = BIT(9); |
| } else if (bw == BW_80) { |
| if (nss == 3 || nss == 7) |
| mask = BIT(6); |
| else if (nss == 6) |
| mask = BIT(9); |
| } else { |
| WARN_ON(bw != BW_40); |
| } |
| |
| switch ((le16_to_cpu(mcs_map) >> (2 * (nss - 1))) & 3) { |
| case IEEE80211_VHT_MCS_SUPPORT_0_7: |
| mask |= 0x300; |
| break; |
| case IEEE80211_VHT_MCS_SUPPORT_0_8: |
| mask |= 0x200; |
| break; |
| case IEEE80211_VHT_MCS_SUPPORT_0_9: |
| break; |
| default: |
| mask = 0x3ff; |
| } |
| |
| return 0x3ff & ~mask; |
| } |
| |
| static bool |
| minstrel_ht_is_legacy_group(int group) |
| { |
| return group == MINSTREL_CCK_GROUP || |
| group == MINSTREL_OFDM_GROUP; |
| } |
| |
| /* |
| * Look up an MCS group index based on mac80211 rate information |
| */ |
| static int |
| minstrel_ht_get_group_idx(struct ieee80211_tx_rate *rate) |
| { |
| return GROUP_IDX((rate->idx / 8) + 1, |
| !!(rate->flags & IEEE80211_TX_RC_SHORT_GI), |
| !!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)); |
| } |
| |
| static int |
| minstrel_vht_get_group_idx(struct ieee80211_tx_rate *rate) |
| { |
| return VHT_GROUP_IDX(ieee80211_rate_get_vht_nss(rate), |
| !!(rate->flags & IEEE80211_TX_RC_SHORT_GI), |
| !!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) + |
| 2*!!(rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH)); |
| } |
| |
| static struct minstrel_rate_stats * |
| minstrel_ht_get_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, |
| struct ieee80211_tx_rate *rate) |
| { |
| int group, idx; |
| |
| if (rate->flags & IEEE80211_TX_RC_MCS) { |
| group = minstrel_ht_get_group_idx(rate); |
| idx = rate->idx % 8; |
| goto out; |
| } |
| |
| if (rate->flags & IEEE80211_TX_RC_VHT_MCS) { |
| group = minstrel_vht_get_group_idx(rate); |
| idx = ieee80211_rate_get_vht_mcs(rate); |
| goto out; |
| } |
| |
| group = MINSTREL_CCK_GROUP; |
| for (idx = 0; idx < ARRAY_SIZE(mp->cck_rates); idx++) { |
| if (rate->idx != mp->cck_rates[idx]) |
| continue; |
| |
| /* short preamble */ |
| if ((mi->supported[group] & BIT(idx + 4)) && |
| (rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)) |
| idx += 4; |
| goto out; |
| } |
| |
| group = MINSTREL_OFDM_GROUP; |
| for (idx = 0; idx < ARRAY_SIZE(mp->ofdm_rates[0]); idx++) |
| if (rate->idx == mp->ofdm_rates[mi->band][idx]) |
| goto out; |
| |
| idx = 0; |
| out: |
| return &mi->groups[group].rates[idx]; |
| } |
| |
| static inline struct minstrel_rate_stats * |
| minstrel_get_ratestats(struct minstrel_ht_sta *mi, int index) |
| { |
| return &mi->groups[MI_RATE_GROUP(index)].rates[MI_RATE_IDX(index)]; |
| } |
| |
| static inline int minstrel_get_duration(int index) |
| { |
| const struct mcs_group *group = &minstrel_mcs_groups[MI_RATE_GROUP(index)]; |
| unsigned int duration = group->duration[MI_RATE_IDX(index)]; |
| |
| return duration << group->shift; |
| } |
| |
| static unsigned int |
| minstrel_ht_avg_ampdu_len(struct minstrel_ht_sta *mi) |
| { |
| int duration; |
| |
| if (mi->avg_ampdu_len) |
| return MINSTREL_TRUNC(mi->avg_ampdu_len); |
| |
| if (minstrel_ht_is_legacy_group(MI_RATE_GROUP(mi->max_tp_rate[0]))) |
| return 1; |
| |
| duration = minstrel_get_duration(mi->max_tp_rate[0]); |
| |
| if (duration > 400 * 1000) |
| return 2; |
| |
| if (duration > 250 * 1000) |
| return 4; |
| |
| if (duration > 150 * 1000) |
| return 8; |
| |
| return 16; |
| } |
| |
| /* |
| * Return current throughput based on the average A-MPDU length, taking into |
| * account the expected number of retransmissions and their expected length |
| */ |
| int |
| minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate, |
| int prob_avg) |
| { |
| unsigned int nsecs = 0, overhead = mi->overhead; |
| unsigned int ampdu_len = 1; |
| |
| /* do not account throughput if sucess prob is below 10% */ |
| if (prob_avg < MINSTREL_FRAC(10, 100)) |
| return 0; |
| |
| if (minstrel_ht_is_legacy_group(group)) |
| overhead = mi->overhead_legacy; |
| else |
| ampdu_len = minstrel_ht_avg_ampdu_len(mi); |
| |
| nsecs = 1000 * overhead / ampdu_len; |
| nsecs += minstrel_mcs_groups[group].duration[rate] << |
| minstrel_mcs_groups[group].shift; |
| |
| /* |
| * For the throughput calculation, limit the probability value to 90% to |
| * account for collision related packet error rate fluctuation |
| * (prob is scaled - see MINSTREL_FRAC above) |
| */ |
| if (prob_avg > MINSTREL_FRAC(90, 100)) |
| prob_avg = MINSTREL_FRAC(90, 100); |
| |
| return MINSTREL_TRUNC(100 * ((prob_avg * 1000000) / nsecs)); |
| } |
| |
| /* |
| * Find & sort topmost throughput rates |
| * |
| * If multiple rates provide equal throughput the sorting is based on their |
| * current success probability. Higher success probability is preferred among |
| * MCS groups, CCK rates do not provide aggregation and are therefore at last. |
| */ |
| static void |
| minstrel_ht_sort_best_tp_rates(struct minstrel_ht_sta *mi, u16 index, |
| u16 *tp_list) |
| { |
| int cur_group, cur_idx, cur_tp_avg, cur_prob; |
| int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob; |
| int j = MAX_THR_RATES; |
| |
| cur_group = MI_RATE_GROUP(index); |
| cur_idx = MI_RATE_IDX(index); |
| cur_prob = mi->groups[cur_group].rates[cur_idx].prob_avg; |
| cur_tp_avg = minstrel_ht_get_tp_avg(mi, cur_group, cur_idx, cur_prob); |
| |
| do { |
| tmp_group = MI_RATE_GROUP(tp_list[j - 1]); |
| tmp_idx = MI_RATE_IDX(tp_list[j - 1]); |
| tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_avg; |
| tmp_tp_avg = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, |
| tmp_prob); |
| if (cur_tp_avg < tmp_tp_avg || |
| (cur_tp_avg == tmp_tp_avg && cur_prob <= tmp_prob)) |
| break; |
| j--; |
| } while (j > 0); |
| |
| if (j < MAX_THR_RATES - 1) { |
| memmove(&tp_list[j + 1], &tp_list[j], (sizeof(*tp_list) * |
| (MAX_THR_RATES - (j + 1)))); |
| } |
| if (j < MAX_THR_RATES) |
| tp_list[j] = index; |
| } |
| |
| /* |
| * Find and set the topmost probability rate per sta and per group |
| */ |
| static void |
| minstrel_ht_set_best_prob_rate(struct minstrel_ht_sta *mi, u16 *dest, u16 index) |
| { |
| struct minstrel_mcs_group_data *mg; |
| struct minstrel_rate_stats *mrs; |
| int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob; |
| int max_tp_group, max_tp_idx, max_tp_prob; |
| int cur_tp_avg, cur_group, cur_idx; |
| int max_gpr_group, max_gpr_idx; |
| int max_gpr_tp_avg, max_gpr_prob; |
| |
| cur_group = MI_RATE_GROUP(index); |
| cur_idx = MI_RATE_IDX(index); |
| mg = &mi->groups[cur_group]; |
| mrs = &mg->rates[cur_idx]; |
| |
| tmp_group = MI_RATE_GROUP(*dest); |
| tmp_idx = MI_RATE_IDX(*dest); |
| tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_avg; |
| tmp_tp_avg = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob); |
| |
| /* if max_tp_rate[0] is from MCS_GROUP max_prob_rate get selected from |
| * MCS_GROUP as well as CCK_GROUP rates do not allow aggregation */ |
| max_tp_group = MI_RATE_GROUP(mi->max_tp_rate[0]); |
| max_tp_idx = MI_RATE_IDX(mi->max_tp_rate[0]); |
| max_tp_prob = mi->groups[max_tp_group].rates[max_tp_idx].prob_avg; |
| |
| if (minstrel_ht_is_legacy_group(MI_RATE_GROUP(index)) && |
| !minstrel_ht_is_legacy_group(max_tp_group)) |
| return; |
| |
| /* skip rates faster than max tp rate with lower prob */ |
| if (minstrel_get_duration(mi->max_tp_rate[0]) > minstrel_get_duration(index) && |
| mrs->prob_avg < max_tp_prob) |
| return; |
| |
| max_gpr_group = MI_RATE_GROUP(mg->max_group_prob_rate); |
| max_gpr_idx = MI_RATE_IDX(mg->max_group_prob_rate); |
| max_gpr_prob = mi->groups[max_gpr_group].rates[max_gpr_idx].prob_avg; |
| |
| if (mrs->prob_avg > MINSTREL_FRAC(75, 100)) { |
| cur_tp_avg = minstrel_ht_get_tp_avg(mi, cur_group, cur_idx, |
| mrs->prob_avg); |
| if (cur_tp_avg > tmp_tp_avg) |
| *dest = index; |
| |
| max_gpr_tp_avg = minstrel_ht_get_tp_avg(mi, max_gpr_group, |
| max_gpr_idx, |
| max_gpr_prob); |
| if (cur_tp_avg > max_gpr_tp_avg) |
| mg->max_group_prob_rate = index; |
| } else { |
| if (mrs->prob_avg > tmp_prob) |
| *dest = index; |
| if (mrs->prob_avg > max_gpr_prob) |
| mg->max_group_prob_rate = index; |
| } |
| } |
| |
| |
| /* |
| * Assign new rate set per sta and use CCK rates only if the fastest |
| * rate (max_tp_rate[0]) is from CCK group. This prohibits such sorted |
| * rate sets where MCS and CCK rates are mixed, because CCK rates can |
| * not use aggregation. |
| */ |
| static void |
| minstrel_ht_assign_best_tp_rates(struct minstrel_ht_sta *mi, |
| u16 tmp_mcs_tp_rate[MAX_THR_RATES], |
| u16 tmp_legacy_tp_rate[MAX_THR_RATES]) |
| { |
| unsigned int tmp_group, tmp_idx, tmp_cck_tp, tmp_mcs_tp, tmp_prob; |
| int i; |
| |
| tmp_group = MI_RATE_GROUP(tmp_legacy_tp_rate[0]); |
| tmp_idx = MI_RATE_IDX(tmp_legacy_tp_rate[0]); |
| tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_avg; |
| tmp_cck_tp = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob); |
| |
| tmp_group = MI_RATE_GROUP(tmp_mcs_tp_rate[0]); |
| tmp_idx = MI_RATE_IDX(tmp_mcs_tp_rate[0]); |
| tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_avg; |
| tmp_mcs_tp = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob); |
| |
| if (tmp_cck_tp > tmp_mcs_tp) { |
| for(i = 0; i < MAX_THR_RATES; i++) { |
| minstrel_ht_sort_best_tp_rates(mi, tmp_legacy_tp_rate[i], |
| tmp_mcs_tp_rate); |
| } |
| } |
| |
| } |
| |
| /* |
| * Try to increase robustness of max_prob rate by decrease number of |
| * streams if possible. |
| */ |
| static inline void |
| minstrel_ht_prob_rate_reduce_streams(struct minstrel_ht_sta *mi) |
| { |
| struct minstrel_mcs_group_data *mg; |
| int tmp_max_streams, group, tmp_idx, tmp_prob; |
| int tmp_tp = 0; |
| |
| if (!mi->sta->ht_cap.ht_supported) |
| return; |
| |
| group = MI_RATE_GROUP(mi->max_tp_rate[0]); |
| tmp_max_streams = minstrel_mcs_groups[group].streams; |
| for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { |
| mg = &mi->groups[group]; |
| if (!mi->supported[group] || group == MINSTREL_CCK_GROUP) |
| continue; |
| |
| tmp_idx = MI_RATE_IDX(mg->max_group_prob_rate); |
| tmp_prob = mi->groups[group].rates[tmp_idx].prob_avg; |
| |
| if (tmp_tp < minstrel_ht_get_tp_avg(mi, group, tmp_idx, tmp_prob) && |
| (minstrel_mcs_groups[group].streams < tmp_max_streams)) { |
| mi->max_prob_rate = mg->max_group_prob_rate; |
| tmp_tp = minstrel_ht_get_tp_avg(mi, group, |
| tmp_idx, |
| tmp_prob); |
| } |
| } |
| } |
| |
| static u16 |
| __minstrel_ht_get_sample_rate(struct minstrel_ht_sta *mi, |
| enum minstrel_sample_type type) |
| { |
| u16 *rates = mi->sample[type].sample_rates; |
| u16 cur; |
| int i; |
| |
| for (i = 0; i < MINSTREL_SAMPLE_RATES; i++) { |
| if (!rates[i]) |
| continue; |
| |
| cur = rates[i]; |
| rates[i] = 0; |
| return cur; |
| } |
| |
| return 0; |
| } |
| |
| static inline int |
| minstrel_ewma(int old, int new, int weight) |
| { |
| int diff, incr; |
| |
| diff = new - old; |
| incr = (EWMA_DIV - weight) * diff / EWMA_DIV; |
| |
| return old + incr; |
| } |
| |
| static inline int minstrel_filter_avg_add(u16 *prev_1, u16 *prev_2, s32 in) |
| { |
| s32 out_1 = *prev_1; |
| s32 out_2 = *prev_2; |
| s32 val; |
| |
| if (!in) |
| in += 1; |
| |
| if (!out_1) { |
| val = out_1 = in; |
| goto out; |
| } |
| |
| val = MINSTREL_AVG_COEFF1 * in; |
| val += MINSTREL_AVG_COEFF2 * out_1; |
| val += MINSTREL_AVG_COEFF3 * out_2; |
| val >>= MINSTREL_SCALE; |
| |
| if (val > 1 << MINSTREL_SCALE) |
| val = 1 << MINSTREL_SCALE; |
| if (val < 0) |
| val = 1; |
| |
| out: |
| *prev_2 = out_1; |
| *prev_1 = val; |
| |
| return val; |
| } |
| |
| /* |
| * Recalculate statistics and counters of a given rate |
| */ |
| static void |
| minstrel_ht_calc_rate_stats(struct minstrel_priv *mp, |
| struct minstrel_rate_stats *mrs) |
| { |
| unsigned int cur_prob; |
| |
| if (unlikely(mrs->attempts > 0)) { |
| cur_prob = MINSTREL_FRAC(mrs->success, mrs->attempts); |
| minstrel_filter_avg_add(&mrs->prob_avg, |
| &mrs->prob_avg_1, cur_prob); |
| mrs->att_hist += mrs->attempts; |
| mrs->succ_hist += mrs->success; |
| } |
| |
| mrs->last_success = mrs->success; |
| mrs->last_attempts = mrs->attempts; |
| mrs->success = 0; |
| mrs->attempts = 0; |
| } |
| |
| static bool |
| minstrel_ht_find_sample_rate(struct minstrel_ht_sta *mi, int type, int idx) |
| { |
| int i; |
| |
| for (i = 0; i < MINSTREL_SAMPLE_RATES; i++) { |
| u16 cur = mi->sample[type].sample_rates[i]; |
| |
| if (cur == idx) |
| return true; |
| |
| if (!cur) |
| break; |
| } |
| |
| return false; |
| } |
| |
| static int |
| minstrel_ht_move_sample_rates(struct minstrel_ht_sta *mi, int type, |
| u32 fast_rate_dur, u32 slow_rate_dur) |
| { |
| u16 *rates = mi->sample[type].sample_rates; |
| int i, j; |
| |
| for (i = 0, j = 0; i < MINSTREL_SAMPLE_RATES; i++) { |
| u32 duration; |
| bool valid = false; |
| u16 cur; |
| |
| cur = rates[i]; |
| if (!cur) |
| continue; |
| |
| duration = minstrel_get_duration(cur); |
| switch (type) { |
| case MINSTREL_SAMPLE_TYPE_SLOW: |
| valid = duration > fast_rate_dur && |
| duration < slow_rate_dur; |
| break; |
| case MINSTREL_SAMPLE_TYPE_INC: |
| case MINSTREL_SAMPLE_TYPE_JUMP: |
| valid = duration < fast_rate_dur; |
| break; |
| default: |
| valid = false; |
| break; |
| } |
| |
| if (!valid) { |
| rates[i] = 0; |
| continue; |
| } |
| |
| if (i == j) |
| continue; |
| |
| rates[j++] = cur; |
| rates[i] = 0; |
| } |
| |
| return j; |
| } |
| |
| static int |
| minstrel_ht_group_min_rate_offset(struct minstrel_ht_sta *mi, int group, |
| u32 max_duration) |
| { |
| u16 supported = mi->supported[group]; |
| int i; |
| |
| for (i = 0; i < MCS_GROUP_RATES && supported; i++, supported >>= 1) { |
| if (!(supported & BIT(0))) |
| continue; |
| |
| if (minstrel_get_duration(MI_RATE(group, i)) >= max_duration) |
| continue; |
| |
| return i; |
| } |
| |
| return -1; |
| } |
| |
| /* |
| * Incremental update rates: |
| * Flip through groups and pick the first group rate that is faster than the |
| * highest currently selected rate |
| */ |
| static u16 |
| minstrel_ht_next_inc_rate(struct minstrel_ht_sta *mi, u32 fast_rate_dur) |
| { |
| struct minstrel_mcs_group_data *mg; |
| u8 type = MINSTREL_SAMPLE_TYPE_INC; |
| int i, index = 0; |
| u8 group; |
| |
| group = mi->sample[type].sample_group; |
| for (i = 0; i < ARRAY_SIZE(minstrel_mcs_groups); i++) { |
| group = (group + 1) % ARRAY_SIZE(minstrel_mcs_groups); |
| mg = &mi->groups[group]; |
| |
| index = minstrel_ht_group_min_rate_offset(mi, group, |
| fast_rate_dur); |
| if (index < 0) |
| continue; |
| |
| index = MI_RATE(group, index & 0xf); |
| if (!minstrel_ht_find_sample_rate(mi, type, index)) |
| goto out; |
| } |
| index = 0; |
| |
| out: |
| mi->sample[type].sample_group = group; |
| |
| return index; |
| } |
| |
| static int |
| minstrel_ht_next_group_sample_rate(struct minstrel_ht_sta *mi, int group, |
| u16 supported, int offset) |
| { |
| struct minstrel_mcs_group_data *mg = &mi->groups[group]; |
| u16 idx; |
| int i; |
| |
| for (i = 0; i < MCS_GROUP_RATES; i++) { |
| idx = sample_table[mg->column][mg->index]; |
| if (++mg->index >= MCS_GROUP_RATES) { |
| mg->index = 0; |
| if (++mg->column >= ARRAY_SIZE(sample_table)) |
| mg->column = 0; |
| } |
| |
| if (idx < offset) |
| continue; |
| |
| if (!(supported & BIT(idx))) |
| continue; |
| |
| return MI_RATE(group, idx); |
| } |
| |
| return -1; |
| } |
| |
| /* |
| * Jump rates: |
| * Sample random rates, use those that are faster than the highest |
| * currently selected rate. Rates between the fastest and the slowest |
| * get sorted into the slow sample bucket, but only if it has room |
| */ |
| static u16 |
| minstrel_ht_next_jump_rate(struct minstrel_ht_sta *mi, u32 fast_rate_dur, |
| u32 slow_rate_dur, int *slow_rate_ofs) |
| { |
| struct minstrel_mcs_group_data *mg; |
| struct minstrel_rate_stats *mrs; |
| u32 max_duration = slow_rate_dur; |
| int i, index, offset; |
| u16 *slow_rates; |
| u16 supported; |
| u32 duration; |
| u8 group; |
| |
| if (*slow_rate_ofs >= MINSTREL_SAMPLE_RATES) |
| max_duration = fast_rate_dur; |
| |
| slow_rates = mi->sample[MINSTREL_SAMPLE_TYPE_SLOW].sample_rates; |
| group = mi->sample[MINSTREL_SAMPLE_TYPE_JUMP].sample_group; |
| for (i = 0; i < ARRAY_SIZE(minstrel_mcs_groups); i++) { |
| u8 type; |
| |
| group = (group + 1) % ARRAY_SIZE(minstrel_mcs_groups); |
| mg = &mi->groups[group]; |
| |
| supported = mi->supported[group]; |
| if (!supported) |
| continue; |
| |
| offset = minstrel_ht_group_min_rate_offset(mi, group, |
| max_duration); |
| if (offset < 0) |
| continue; |
| |
| index = minstrel_ht_next_group_sample_rate(mi, group, supported, |
| offset); |
| if (index < 0) |
| continue; |
| |
| duration = minstrel_get_duration(index); |
| if (duration < fast_rate_dur) |
| type = MINSTREL_SAMPLE_TYPE_JUMP; |
| else |
| type = MINSTREL_SAMPLE_TYPE_SLOW; |
| |
| if (minstrel_ht_find_sample_rate(mi, type, index)) |
| continue; |
| |
| if (type == MINSTREL_SAMPLE_TYPE_JUMP) |
| goto found; |
| |
| if (*slow_rate_ofs >= MINSTREL_SAMPLE_RATES) |
| continue; |
| |
| if (duration >= slow_rate_dur) |
| continue; |
| |
| /* skip slow rates with high success probability */ |
| mrs = minstrel_get_ratestats(mi, index); |
| if (mrs->prob_avg > MINSTREL_FRAC(95, 100)) |
| continue; |
| |
| slow_rates[(*slow_rate_ofs)++] = index; |
| if (*slow_rate_ofs >= MINSTREL_SAMPLE_RATES) |
| max_duration = fast_rate_dur; |
| } |
| index = 0; |
| |
| found: |
| mi->sample[MINSTREL_SAMPLE_TYPE_JUMP].sample_group = group; |
| |
| return index; |
| } |
| |
| static void |
| minstrel_ht_refill_sample_rates(struct minstrel_ht_sta *mi) |
| { |
| u32 prob_dur = minstrel_get_duration(mi->max_prob_rate); |
| u32 tp_dur = minstrel_get_duration(mi->max_tp_rate[0]); |
| u32 tp2_dur = minstrel_get_duration(mi->max_tp_rate[1]); |
| u32 fast_rate_dur = min(min(tp_dur, tp2_dur), prob_dur); |
| u32 slow_rate_dur = max(max(tp_dur, tp2_dur), prob_dur); |
| u16 *rates; |
| int i, j; |
| |
| rates = mi->sample[MINSTREL_SAMPLE_TYPE_INC].sample_rates; |
| i = minstrel_ht_move_sample_rates(mi, MINSTREL_SAMPLE_TYPE_INC, |
| fast_rate_dur, slow_rate_dur); |
| while (i < MINSTREL_SAMPLE_RATES) { |
| rates[i] = minstrel_ht_next_inc_rate(mi, tp_dur); |
| if (!rates[i]) |
| break; |
| |
| i++; |
| } |
| |
| rates = mi->sample[MINSTREL_SAMPLE_TYPE_JUMP].sample_rates; |
| i = minstrel_ht_move_sample_rates(mi, MINSTREL_SAMPLE_TYPE_JUMP, |
| fast_rate_dur, slow_rate_dur); |
| j = minstrel_ht_move_sample_rates(mi, MINSTREL_SAMPLE_TYPE_SLOW, |
| fast_rate_dur, slow_rate_dur); |
| while (i < MINSTREL_SAMPLE_RATES) { |
| rates[i] = minstrel_ht_next_jump_rate(mi, fast_rate_dur, |
| slow_rate_dur, &j); |
| if (!rates[i]) |
| break; |
| |
| i++; |
| } |
| |
| for (i = 0; i < ARRAY_SIZE(mi->sample); i++) |
| memcpy(mi->sample[i].cur_sample_rates, mi->sample[i].sample_rates, |
| sizeof(mi->sample[i].cur_sample_rates)); |
| } |
| |
| |
| /* |
| * Update rate statistics and select new primary rates |
| * |
| * Rules for rate selection: |
| * - max_prob_rate must use only one stream, as a tradeoff between delivery |
| * probability and throughput during strong fluctuations |
| * - as long as the max prob rate has a probability of more than 75%, pick |
| * higher throughput rates, even if the probablity is a bit lower |
| */ |
| static void |
| minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) |
| { |
| struct minstrel_mcs_group_data *mg; |
| struct minstrel_rate_stats *mrs; |
| int group, i, j, cur_prob; |
| u16 tmp_mcs_tp_rate[MAX_THR_RATES], tmp_group_tp_rate[MAX_THR_RATES]; |
| u16 tmp_legacy_tp_rate[MAX_THR_RATES], tmp_max_prob_rate; |
| u16 index; |
| bool ht_supported = mi->sta->ht_cap.ht_supported; |
| |
| if (mi->ampdu_packets > 0) { |
| if (!ieee80211_hw_check(mp->hw, TX_STATUS_NO_AMPDU_LEN)) |
| mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len, |
| MINSTREL_FRAC(mi->ampdu_len, mi->ampdu_packets), |
| EWMA_LEVEL); |
| else |
| mi->avg_ampdu_len = 0; |
| mi->ampdu_len = 0; |
| mi->ampdu_packets = 0; |
| } |
| |
| if (mi->supported[MINSTREL_CCK_GROUP]) |
| group = MINSTREL_CCK_GROUP; |
| else if (mi->supported[MINSTREL_OFDM_GROUP]) |
| group = MINSTREL_OFDM_GROUP; |
| else |
| group = 0; |
| |
| index = MI_RATE(group, 0); |
| for (j = 0; j < ARRAY_SIZE(tmp_legacy_tp_rate); j++) |
| tmp_legacy_tp_rate[j] = index; |
| |
| if (mi->supported[MINSTREL_VHT_GROUP_0]) |
| group = MINSTREL_VHT_GROUP_0; |
| else if (ht_supported) |
| group = MINSTREL_HT_GROUP_0; |
| else if (mi->supported[MINSTREL_CCK_GROUP]) |
| group = MINSTREL_CCK_GROUP; |
| else |
| group = MINSTREL_OFDM_GROUP; |
| |
| index = MI_RATE(group, 0); |
| tmp_max_prob_rate = index; |
| for (j = 0; j < ARRAY_SIZE(tmp_mcs_tp_rate); j++) |
| tmp_mcs_tp_rate[j] = index; |
| |
| /* Find best rate sets within all MCS groups*/ |
| for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { |
| u16 *tp_rate = tmp_mcs_tp_rate; |
| u16 last_prob = 0; |
| |
| mg = &mi->groups[group]; |
| if (!mi->supported[group]) |
| continue; |
| |
| /* (re)Initialize group rate indexes */ |
| for(j = 0; j < MAX_THR_RATES; j++) |
| tmp_group_tp_rate[j] = MI_RATE(group, 0); |
| |
| if (group == MINSTREL_CCK_GROUP && ht_supported) |
| tp_rate = tmp_legacy_tp_rate; |
| |
| for (i = MCS_GROUP_RATES - 1; i >= 0; i--) { |
| if (!(mi->supported[group] & BIT(i))) |
| continue; |
| |
| index = MI_RATE(group, i); |
| |
| mrs = &mg->rates[i]; |
| mrs->retry_updated = false; |
| minstrel_ht_calc_rate_stats(mp, mrs); |
| |
| if (mrs->att_hist) |
| last_prob = max(last_prob, mrs->prob_avg); |
| else |
| mrs->prob_avg = max(last_prob, mrs->prob_avg); |
| cur_prob = mrs->prob_avg; |
| |
| if (minstrel_ht_get_tp_avg(mi, group, i, cur_prob) == 0) |
| continue; |
| |
| /* Find max throughput rate set */ |
| minstrel_ht_sort_best_tp_rates(mi, index, tp_rate); |
| |
| /* Find max throughput rate set within a group */ |
| minstrel_ht_sort_best_tp_rates(mi, index, |
| tmp_group_tp_rate); |
| } |
| |
| memcpy(mg->max_group_tp_rate, tmp_group_tp_rate, |
| sizeof(mg->max_group_tp_rate)); |
| } |
| |
| /* Assign new rate set per sta */ |
| minstrel_ht_assign_best_tp_rates(mi, tmp_mcs_tp_rate, |
| tmp_legacy_tp_rate); |
| memcpy(mi->max_tp_rate, tmp_mcs_tp_rate, sizeof(mi->max_tp_rate)); |
| |
| for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { |
| if (!mi->supported[group]) |
| continue; |
| |
| mg = &mi->groups[group]; |
| mg->max_group_prob_rate = MI_RATE(group, 0); |
| |
| for (i = 0; i < MCS_GROUP_RATES; i++) { |
| if (!(mi->supported[group] & BIT(i))) |
| continue; |
| |
| index = MI_RATE(group, i); |
| |
| /* Find max probability rate per group and global */ |
| minstrel_ht_set_best_prob_rate(mi, &tmp_max_prob_rate, |
| index); |
| } |
| } |
| |
| mi->max_prob_rate = tmp_max_prob_rate; |
| |
| /* Try to increase robustness of max_prob_rate*/ |
| minstrel_ht_prob_rate_reduce_streams(mi); |
| minstrel_ht_refill_sample_rates(mi); |
| |
| #ifdef CONFIG_MAC80211_DEBUGFS |
| /* use fixed index if set */ |
| if (mp->fixed_rate_idx != -1) { |
| for (i = 0; i < 4; i++) |
| mi->max_tp_rate[i] = mp->fixed_rate_idx; |
| mi->max_prob_rate = mp->fixed_rate_idx; |
| } |
| #endif |
| |
| /* Reset update timer */ |
| mi->last_stats_update = jiffies; |
| mi->sample_time = jiffies; |
| } |
| |
| static bool |
| minstrel_ht_txstat_valid(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, |
| struct ieee80211_tx_rate *rate) |
| { |
| int i; |
| |
| if (rate->idx < 0) |
| return false; |
| |
| if (!rate->count) |
| return false; |
| |
| if (rate->flags & IEEE80211_TX_RC_MCS || |
| rate->flags & IEEE80211_TX_RC_VHT_MCS) |
| return true; |
| |
| for (i = 0; i < ARRAY_SIZE(mp->cck_rates); i++) |
| if (rate->idx == mp->cck_rates[i]) |
| return true; |
| |
| for (i = 0; i < ARRAY_SIZE(mp->ofdm_rates[0]); i++) |
| if (rate->idx == mp->ofdm_rates[mi->band][i]) |
| return true; |
| |
| return false; |
| } |
| |
| static void |
| minstrel_downgrade_rate(struct minstrel_ht_sta *mi, u16 *idx, bool primary) |
| { |
| int group, orig_group; |
| |
| orig_group = group = MI_RATE_GROUP(*idx); |
| while (group > 0) { |
| group--; |
| |
| if (!mi->supported[group]) |
| continue; |
| |
| if (minstrel_mcs_groups[group].streams > |
| minstrel_mcs_groups[orig_group].streams) |
| continue; |
| |
| if (primary) |
| *idx = mi->groups[group].max_group_tp_rate[0]; |
| else |
| *idx = mi->groups[group].max_group_tp_rate[1]; |
| break; |
| } |
| } |
| |
| static void |
| minstrel_aggr_check(struct ieee80211_sta *pubsta, struct sk_buff *skb) |
| { |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
| u16 tid; |
| |
| if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO) |
| return; |
| |
| if (unlikely(!ieee80211_is_data_qos(hdr->frame_control))) |
| return; |
| |
| if (unlikely(skb->protocol == cpu_to_be16(ETH_P_PAE))) |
| return; |
| |
| tid = ieee80211_get_tid(hdr); |
| if (likely(sta->ampdu_mlme.tid_tx[tid])) |
| return; |
| |
| ieee80211_start_tx_ba_session(pubsta, tid, 0); |
| } |
| |
| static void |
| minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband, |
| void *priv_sta, struct ieee80211_tx_status *st) |
| { |
| struct ieee80211_tx_info *info = st->info; |
| struct minstrel_ht_sta *mi = priv_sta; |
| struct ieee80211_tx_rate *ar = info->status.rates; |
| struct minstrel_rate_stats *rate, *rate2; |
| struct minstrel_priv *mp = priv; |
| u32 update_interval = mp->update_interval; |
| bool last, update = false; |
| int i; |
| |
| /* This packet was aggregated but doesn't carry status info */ |
| if ((info->flags & IEEE80211_TX_CTL_AMPDU) && |
| !(info->flags & IEEE80211_TX_STAT_AMPDU)) |
| return; |
| |
| if (!(info->flags & IEEE80211_TX_STAT_AMPDU)) { |
| info->status.ampdu_ack_len = |
| (info->flags & IEEE80211_TX_STAT_ACK ? 1 : 0); |
| info->status.ampdu_len = 1; |
| } |
| |
| /* wraparound */ |
| if (mi->total_packets >= ~0 - info->status.ampdu_len) { |
| mi->total_packets = 0; |
| mi->sample_packets = 0; |
| } |
| |
| mi->total_packets += info->status.ampdu_len; |
| if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) |
| mi->sample_packets += info->status.ampdu_len; |
| |
| mi->ampdu_packets++; |
| mi->ampdu_len += info->status.ampdu_len; |
| |
| last = !minstrel_ht_txstat_valid(mp, mi, &ar[0]); |
| for (i = 0; !last; i++) { |
| last = (i == IEEE80211_TX_MAX_RATES - 1) || |
| !minstrel_ht_txstat_valid(mp, mi, &ar[i + 1]); |
| |
| rate = minstrel_ht_get_stats(mp, mi, &ar[i]); |
| if (last) |
| rate->success += info->status.ampdu_ack_len; |
| |
| rate->attempts += ar[i].count * info->status.ampdu_len; |
| } |
| |
| if (mp->hw->max_rates > 1) { |
| /* |
| * check for sudden death of spatial multiplexing, |
| * downgrade to a lower number of streams if necessary. |
| */ |
| rate = minstrel_get_ratestats(mi, mi->max_tp_rate[0]); |
| if (rate->attempts > 30 && |
| rate->success < rate->attempts / 4) { |
| minstrel_downgrade_rate(mi, &mi->max_tp_rate[0], true); |
| update = true; |
| } |
| |
| rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate[1]); |
| if (rate2->attempts > 30 && |
| rate2->success < rate2->attempts / 4) { |
| minstrel_downgrade_rate(mi, &mi->max_tp_rate[1], false); |
| update = true; |
| } |
| } |
| |
| if (time_after(jiffies, mi->last_stats_update + update_interval)) { |
| update = true; |
| minstrel_ht_update_stats(mp, mi); |
| } |
| |
| if (update) |
| minstrel_ht_update_rates(mp, mi); |
| } |
| |
| static void |
| minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, |
| int index) |
| { |
| struct minstrel_rate_stats *mrs; |
| unsigned int tx_time, tx_time_rtscts, tx_time_data; |
| unsigned int cw = mp->cw_min; |
| unsigned int ctime = 0; |
| unsigned int t_slot = 9; /* FIXME */ |
| unsigned int ampdu_len = minstrel_ht_avg_ampdu_len(mi); |
| unsigned int overhead = 0, overhead_rtscts = 0; |
| |
| mrs = minstrel_get_ratestats(mi, index); |
| if (mrs->prob_avg < MINSTREL_FRAC(1, 10)) { |
| mrs->retry_count = 1; |
| mrs->retry_count_rtscts = 1; |
| return; |
| } |
| |
| mrs->retry_count = 2; |
| mrs->retry_count_rtscts = 2; |
| mrs->retry_updated = true; |
| |
| tx_time_data = minstrel_get_duration(index) * ampdu_len / 1000; |
| |
| /* Contention time for first 2 tries */ |
| ctime = (t_slot * cw) >> 1; |
| cw = min((cw << 1) | 1, mp->cw_max); |
| ctime += (t_slot * cw) >> 1; |
| cw = min((cw << 1) | 1, mp->cw_max); |
| |
| if (minstrel_ht_is_legacy_group(MI_RATE_GROUP(index))) { |
| overhead = mi->overhead_legacy; |
| overhead_rtscts = mi->overhead_legacy_rtscts; |
| } else { |
| overhead = mi->overhead; |
| overhead_rtscts = mi->overhead_rtscts; |
| } |
| |
| /* Total TX time for data and Contention after first 2 tries */ |
| tx_time = ctime + 2 * (overhead + tx_time_data); |
| tx_time_rtscts = ctime + 2 * (overhead_rtscts + tx_time_data); |
| |
| /* See how many more tries we can fit inside segment size */ |
| do { |
| /* Contention time for this try */ |
| ctime = (t_slot * cw) >> 1; |
| cw = min((cw << 1) | 1, mp->cw_max); |
| |
| /* Total TX time after this try */ |
| tx_time += ctime + overhead + tx_time_data; |
| tx_time_rtscts += ctime + overhead_rtscts + tx_time_data; |
| |
| if (tx_time_rtscts < mp->segment_size) |
| mrs->retry_count_rtscts++; |
| } while ((tx_time < mp->segment_size) && |
| (++mrs->retry_count < mp->max_retry)); |
| } |
| |
| |
| static void |
| minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, |
| struct ieee80211_sta_rates *ratetbl, int offset, int index) |
| { |
| int group_idx = MI_RATE_GROUP(index); |
| const struct mcs_group *group = &minstrel_mcs_groups[group_idx]; |
| struct minstrel_rate_stats *mrs; |
| u8 idx; |
| u16 flags = group->flags; |
| |
| mrs = minstrel_get_ratestats(mi, index); |
| if (!mrs->retry_updated) |
| minstrel_calc_retransmit(mp, mi, index); |
| |
| if (mrs->prob_avg < MINSTREL_FRAC(20, 100) || !mrs->retry_count) { |
| ratetbl->rate[offset].count = 2; |
| ratetbl->rate[offset].count_rts = 2; |
| ratetbl->rate[offset].count_cts = 2; |
| } else { |
| ratetbl->rate[offset].count = mrs->retry_count; |
| ratetbl->rate[offset].count_cts = mrs->retry_count; |
| ratetbl->rate[offset].count_rts = mrs->retry_count_rtscts; |
| } |
| |
| index = MI_RATE_IDX(index); |
| if (group_idx == MINSTREL_CCK_GROUP) |
| idx = mp->cck_rates[index % ARRAY_SIZE(mp->cck_rates)]; |
| else if (group_idx == MINSTREL_OFDM_GROUP) |
| idx = mp->ofdm_rates[mi->band][index % |
| ARRAY_SIZE(mp->ofdm_rates[0])]; |
| else if (flags & IEEE80211_TX_RC_VHT_MCS) |
| idx = ((group->streams - 1) << 4) | |
| (index & 0xF); |
| else |
| idx = index + (group->streams - 1) * 8; |
| |
| /* enable RTS/CTS if needed: |
| * - if station is in dynamic SMPS (and streams > 1) |
| * - for fallback rates, to increase chances of getting through |
| */ |
| if (offset > 0 || |
| (mi->sta->smps_mode == IEEE80211_SMPS_DYNAMIC && |
| group->streams > 1)) { |
| ratetbl->rate[offset].count = ratetbl->rate[offset].count_rts; |
| flags |= IEEE80211_TX_RC_USE_RTS_CTS; |
| } |
| |
| ratetbl->rate[offset].idx = idx; |
| ratetbl->rate[offset].flags = flags; |
| } |
| |
| static inline int |
| minstrel_ht_get_prob_avg(struct minstrel_ht_sta *mi, int rate) |
| { |
| int group = MI_RATE_GROUP(rate); |
| rate = MI_RATE_IDX(rate); |
| return mi->groups[group].rates[rate].prob_avg; |
| } |
| |
| static int |
| minstrel_ht_get_max_amsdu_len(struct minstrel_ht_sta *mi) |
| { |
| int group = MI_RATE_GROUP(mi->max_prob_rate); |
| const struct mcs_group *g = &minstrel_mcs_groups[group]; |
| int rate = MI_RATE_IDX(mi->max_prob_rate); |
| unsigned int duration; |
| |
| /* Disable A-MSDU if max_prob_rate is bad */ |
| if (mi->groups[group].rates[rate].prob_avg < MINSTREL_FRAC(50, 100)) |
| return 1; |
| |
| duration = g->duration[rate]; |
| duration <<= g->shift; |
| |
| /* If the rate is slower than single-stream MCS1, make A-MSDU limit small */ |
| if (duration > MCS_DURATION(1, 0, 52)) |
| return 500; |
| |
| /* |
| * If the rate is slower than single-stream MCS4, limit A-MSDU to usual |
| * data packet size |
| */ |
| if (duration > MCS_DURATION(1, 0, 104)) |
| return 1600; |
| |
| /* |
| * If the rate is slower than single-stream MCS7, or if the max throughput |
| * rate success probability is less than 75%, limit A-MSDU to twice the usual |
| * data packet size |
| */ |
| if (duration > MCS_DURATION(1, 0, 260) || |
| (minstrel_ht_get_prob_avg(mi, mi->max_tp_rate[0]) < |
| MINSTREL_FRAC(75, 100))) |
| return 3200; |
| |
| /* |
| * HT A-MPDU limits maximum MPDU size under BA agreement to 4095 bytes. |
| * Since aggregation sessions are started/stopped without txq flush, use |
| * the limit here to avoid the complexity of having to de-aggregate |
| * packets in the queue. |
| */ |
| if (!mi->sta->vht_cap.vht_supported) |
| return IEEE80211_MAX_MPDU_LEN_HT_BA; |
| |
| /* unlimited */ |
| return 0; |
| } |
| |
| static void |
| minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) |
| { |
| struct ieee80211_sta_rates *rates; |
| int i = 0; |
| |
| rates = kzalloc(sizeof(*rates), GFP_ATOMIC); |
| if (!rates) |
| return; |
| |
| /* Start with max_tp_rate[0] */ |
| minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[0]); |
| |
| if (mp->hw->max_rates >= 3) { |
| /* At least 3 tx rates supported, use max_tp_rate[1] next */ |
| minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[1]); |
| } |
| |
| if (mp->hw->max_rates >= 2) { |
| minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_prob_rate); |
| } |
| |
| mi->sta->max_rc_amsdu_len = minstrel_ht_get_max_amsdu_len(mi); |
| rates->rate[i].idx = -1; |
| rate_control_set_rates(mp->hw, mi->sta, rates); |
| } |
| |
| static u16 |
| minstrel_ht_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) |
| { |
| u8 seq; |
| |
| if (mp->hw->max_rates > 1) { |
| seq = mi->sample_seq; |
| mi->sample_seq = (seq + 1) % ARRAY_SIZE(minstrel_sample_seq); |
| seq = minstrel_sample_seq[seq]; |
| } else { |
| seq = MINSTREL_SAMPLE_TYPE_INC; |
| } |
| |
| return __minstrel_ht_get_sample_rate(mi, seq); |
| } |
| |
| static void |
| minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta, |
| struct ieee80211_tx_rate_control *txrc) |
| { |
| const struct mcs_group *sample_group; |
| struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); |
| struct ieee80211_tx_rate *rate = &info->status.rates[0]; |
| struct minstrel_ht_sta *mi = priv_sta; |
| struct minstrel_priv *mp = priv; |
| u16 sample_idx; |
| |
| if (!(info->flags & IEEE80211_TX_CTL_AMPDU) && |
| !minstrel_ht_is_legacy_group(MI_RATE_GROUP(mi->max_prob_rate))) |
| minstrel_aggr_check(sta, txrc->skb); |
| |
| info->flags |= mi->tx_flags; |
| |
| #ifdef CONFIG_MAC80211_DEBUGFS |
| if (mp->fixed_rate_idx != -1) |
| return; |
| #endif |
| |
| /* Don't use EAPOL frames for sampling on non-mrr hw */ |
| if (mp->hw->max_rates == 1 && |
| (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO)) |
| return; |
| |
| if (time_is_before_jiffies(mi->sample_time)) |
| return; |
| |
| mi->sample_time = jiffies + MINSTREL_SAMPLE_INTERVAL; |
| sample_idx = minstrel_ht_get_sample_rate(mp, mi); |
| if (!sample_idx) |
| return; |
| |
| sample_group = &minstrel_mcs_groups[MI_RATE_GROUP(sample_idx)]; |
| sample_idx = MI_RATE_IDX(sample_idx); |
| |
| if (sample_group == &minstrel_mcs_groups[MINSTREL_CCK_GROUP] && |
| (sample_idx >= 4) != txrc->short_preamble) |
| return; |
| |
| info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; |
| rate->count = 1; |
| |
| if (sample_group == &minstrel_mcs_groups[MINSTREL_CCK_GROUP]) { |
| int idx = sample_idx % ARRAY_SIZE(mp->cck_rates); |
| rate->idx = mp->cck_rates[idx]; |
| } else if (sample_group == &minstrel_mcs_groups[MINSTREL_OFDM_GROUP]) { |
| int idx = sample_idx % ARRAY_SIZE(mp->ofdm_rates[0]); |
| rate->idx = mp->ofdm_rates[mi->band][idx]; |
| } else if (sample_group->flags & IEEE80211_TX_RC_VHT_MCS) { |
| ieee80211_rate_set_vht(rate, MI_RATE_IDX(sample_idx), |
| sample_group->streams); |
| } else { |
| rate->idx = sample_idx + (sample_group->streams - 1) * 8; |
| } |
| |
| rate->flags = sample_group->flags; |
| } |
| |
| static void |
| minstrel_ht_update_cck(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, |
| struct ieee80211_supported_band *sband, |
| struct ieee80211_sta *sta) |
| { |
| int i; |
| |
| if (sband->band != NL80211_BAND_2GHZ) |
| return; |
| |
| if (sta->ht_cap.ht_supported && |
| !ieee80211_hw_check(mp->hw, SUPPORTS_HT_CCK_RATES)) |
| return; |
| |
| for (i = 0; i < 4; i++) { |
| if (mp->cck_rates[i] == 0xff || |
| !rate_supported(sta, sband->band, mp->cck_rates[i])) |
| continue; |
| |
| mi->supported[MINSTREL_CCK_GROUP] |= BIT(i); |
| if (sband->bitrates[i].flags & IEEE80211_RATE_SHORT_PREAMBLE) |
| mi->supported[MINSTREL_CCK_GROUP] |= BIT(i + 4); |
| } |
| } |
| |
| static void |
| minstrel_ht_update_ofdm(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, |
| struct ieee80211_supported_band *sband, |
| struct ieee80211_sta *sta) |
| { |
| const u8 *rates; |
| int i; |
| |
| if (sta->ht_cap.ht_supported) |
| return; |
| |
| rates = mp->ofdm_rates[sband->band]; |
| for (i = 0; i < ARRAY_SIZE(mp->ofdm_rates[0]); i++) { |
| if (rates[i] == 0xff || |
| !rate_supported(sta, sband->band, rates[i])) |
| continue; |
| |
| mi->supported[MINSTREL_OFDM_GROUP] |= BIT(i); |
| } |
| } |
| |
| static void |
| minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband, |
| struct cfg80211_chan_def *chandef, |
| struct ieee80211_sta *sta, void *priv_sta) |
| { |
| struct minstrel_priv *mp = priv; |
| struct minstrel_ht_sta *mi = priv_sta; |
| struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs; |
| u16 ht_cap = sta->ht_cap.cap; |
| struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; |
| const struct ieee80211_rate *ctl_rate; |
| bool ldpc, erp; |
| int use_vht; |
| int n_supported = 0; |
| int ack_dur; |
| int stbc; |
| int i; |
| |
| BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) != MINSTREL_GROUPS_NB); |
| |
| if (vht_cap->vht_supported) |
| use_vht = vht_cap->vht_mcs.tx_mcs_map != cpu_to_le16(~0); |
| else |
| use_vht = 0; |
| |
| memset(mi, 0, sizeof(*mi)); |
| |
| mi->sta = sta; |
| mi->band = sband->band; |
| mi->last_stats_update = jiffies; |
| |
| ack_dur = ieee80211_frame_duration(sband->band, 10, 60, 1, 1, 0); |
| mi->overhead = ieee80211_frame_duration(sband->band, 0, 60, 1, 1, 0); |
| mi->overhead += ack_dur; |
| mi->overhead_rtscts = mi->overhead + 2 * ack_dur; |
| |
| ctl_rate = &sband->bitrates[rate_lowest_index(sband, sta)]; |
| erp = ctl_rate->flags & IEEE80211_RATE_ERP_G; |
| ack_dur = ieee80211_frame_duration(sband->band, 10, |
| ctl_rate->bitrate, erp, 1, |
| ieee80211_chandef_get_shift(chandef)); |
| mi->overhead_legacy = ack_dur; |
| mi->overhead_legacy_rtscts = mi->overhead_legacy + 2 * ack_dur; |
| |
| mi->avg_ampdu_len = MINSTREL_FRAC(1, 1); |
| |
| if (!use_vht) { |
| stbc = (ht_cap & IEEE80211_HT_CAP_RX_STBC) >> |
| IEEE80211_HT_CAP_RX_STBC_SHIFT; |
| |
| ldpc = ht_cap & IEEE80211_HT_CAP_LDPC_CODING; |
| } else { |
| stbc = (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK) >> |
| IEEE80211_VHT_CAP_RXSTBC_SHIFT; |
| |
| ldpc = vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC; |
| } |
| |
| mi->tx_flags |= stbc << IEEE80211_TX_CTL_STBC_SHIFT; |
| if (ldpc) |
| mi->tx_flags |= IEEE80211_TX_CTL_LDPC; |
| |
| for (i = 0; i < ARRAY_SIZE(mi->groups); i++) { |
| u32 gflags = minstrel_mcs_groups[i].flags; |
| int bw, nss; |
| |
| mi->supported[i] = 0; |
| if (minstrel_ht_is_legacy_group(i)) |
| continue; |
| |
| if (gflags & IEEE80211_TX_RC_SHORT_GI) { |
| if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH) { |
| if (!(ht_cap & IEEE80211_HT_CAP_SGI_40)) |
| continue; |
| } else { |
| if (!(ht_cap & IEEE80211_HT_CAP_SGI_20)) |
| continue; |
| } |
| } |
| |
| if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH && |
| sta->bandwidth < IEEE80211_STA_RX_BW_40) |
| continue; |
| |
| nss = minstrel_mcs_groups[i].streams; |
| |
| /* Mark MCS > 7 as unsupported if STA is in static SMPS mode */ |
| if (sta->smps_mode == IEEE80211_SMPS_STATIC && nss > 1) |
| continue; |
| |
| /* HT rate */ |
| if (gflags & IEEE80211_TX_RC_MCS) { |
| if (use_vht && minstrel_vht_only) |
| continue; |
| |
| mi->supported[i] = mcs->rx_mask[nss - 1]; |
| if (mi->supported[i]) |
| n_supported++; |
| continue; |
| } |
| |
| /* VHT rate */ |
| if (!vht_cap->vht_supported || |
| WARN_ON(!(gflags & IEEE80211_TX_RC_VHT_MCS)) || |
| WARN_ON(gflags & IEEE80211_TX_RC_160_MHZ_WIDTH)) |
| continue; |
| |
| if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH) { |
| if (sta->bandwidth < IEEE80211_STA_RX_BW_80 || |
| ((gflags & IEEE80211_TX_RC_SHORT_GI) && |
| !(vht_cap->cap & IEEE80211_VHT_CAP_SHORT_GI_80))) { |
| continue; |
| } |
| } |
| |
| if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH) |
| bw = BW_40; |
| else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH) |
| bw = BW_80; |
| else |
| bw = BW_20; |
| |
| mi->supported[i] = minstrel_get_valid_vht_rates(bw, nss, |
| vht_cap->vht_mcs.tx_mcs_map); |
| |
| if (mi->supported[i]) |
| n_supported++; |
| } |
| |
| minstrel_ht_update_cck(mp, mi, sband, sta); |
| minstrel_ht_update_ofdm(mp, mi, sband, sta); |
| |
| /* create an initial rate table with the lowest supported rates */ |
| minstrel_ht_update_stats(mp, mi); |
| minstrel_ht_update_rates(mp, mi); |
| } |
| |
| static void |
| minstrel_ht_rate_init(void *priv, struct ieee80211_supported_band *sband, |
| struct cfg80211_chan_def *chandef, |
| struct ieee80211_sta *sta, void *priv_sta) |
| { |
| minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta); |
| } |
| |
| static void |
| minstrel_ht_rate_update(void *priv, struct ieee80211_supported_band *sband, |
| struct cfg80211_chan_def *chandef, |
| struct ieee80211_sta *sta, void *priv_sta, |
| u32 changed) |
| { |
| minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta); |
| } |
| |
| static void * |
| minstrel_ht_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp) |
| { |
| struct ieee80211_supported_band *sband; |
| struct minstrel_ht_sta *mi; |
| struct minstrel_priv *mp = priv; |
| struct ieee80211_hw *hw = mp->hw; |
| int max_rates = 0; |
| int i; |
| |
| for (i = 0; i < NUM_NL80211_BANDS; i++) { |
| sband = hw->wiphy->bands[i]; |
| if (sband && sband->n_bitrates > max_rates) |
| max_rates = sband->n_bitrates; |
| } |
| |
| return kzalloc(sizeof(*mi), gfp); |
| } |
| |
| static void |
| minstrel_ht_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta) |
| { |
| kfree(priv_sta); |
| } |
| |
| static void |
| minstrel_ht_fill_rate_array(u8 *dest, struct ieee80211_supported_band *sband, |
| const s16 *bitrates, int n_rates, u32 rate_flags) |
| { |
| int i, j; |
| |
| for (i = 0; i < sband->n_bitrates; i++) { |
| struct ieee80211_rate *rate = &sband->bitrates[i]; |
| |
| if ((rate_flags & sband->bitrates[i].flags) != rate_flags) |
| continue; |
| |
| for (j = 0; j < n_rates; j++) { |
| if (rate->bitrate != bitrates[j]) |
| continue; |
| |
| dest[j] = i; |
| break; |
| } |
| } |
| } |
| |
| static void |
| minstrel_ht_init_cck_rates(struct minstrel_priv *mp) |
| { |
| static const s16 bitrates[4] = { 10, 20, 55, 110 }; |
| struct ieee80211_supported_band *sband; |
| u32 rate_flags = ieee80211_chandef_rate_flags(&mp->hw->conf.chandef); |
| |
| memset(mp->cck_rates, 0xff, sizeof(mp->cck_rates)); |
| sband = mp->hw->wiphy->bands[NL80211_BAND_2GHZ]; |
| if (!sband) |
| return; |
| |
| BUILD_BUG_ON(ARRAY_SIZE(mp->cck_rates) != ARRAY_SIZE(bitrates)); |
| minstrel_ht_fill_rate_array(mp->cck_rates, sband, |
| minstrel_cck_bitrates, |
| ARRAY_SIZE(minstrel_cck_bitrates), |
| rate_flags); |
| } |
| |
| static void |
| minstrel_ht_init_ofdm_rates(struct minstrel_priv *mp, enum nl80211_band band) |
| { |
| static const s16 bitrates[8] = { 60, 90, 120, 180, 240, 360, 480, 540 }; |
| struct ieee80211_supported_band *sband; |
| u32 rate_flags = ieee80211_chandef_rate_flags(&mp->hw->conf.chandef); |
| |
| memset(mp->ofdm_rates[band], 0xff, sizeof(mp->ofdm_rates[band])); |
| sband = mp->hw->wiphy->bands[band]; |
| if (!sband) |
| return; |
| |
| BUILD_BUG_ON(ARRAY_SIZE(mp->ofdm_rates[band]) != ARRAY_SIZE(bitrates)); |
| minstrel_ht_fill_rate_array(mp->ofdm_rates[band], sband, |
| minstrel_ofdm_bitrates, |
| ARRAY_SIZE(minstrel_ofdm_bitrates), |
| rate_flags); |
| } |
| |
| static void * |
| minstrel_ht_alloc(struct ieee80211_hw *hw) |
| { |
| struct minstrel_priv *mp; |
| int i; |
| |
| mp = kzalloc(sizeof(struct minstrel_priv), GFP_ATOMIC); |
| if (!mp) |
| return NULL; |
| |
| /* contention window settings |
| * Just an approximation. Using the per-queue values would complicate |
| * the calculations and is probably unnecessary */ |
| mp->cw_min = 15; |
| mp->cw_max = 1023; |
| |
| /* maximum time that the hw is allowed to stay in one MRR segment */ |
| mp->segment_size = 6000; |
| |
| if (hw->max_rate_tries > 0) |
| mp->max_retry = hw->max_rate_tries; |
| else |
| /* safe default, does not necessarily have to match hw properties */ |
| mp->max_retry = 7; |
| |
| if (hw->max_rates >= 4) |
| mp->has_mrr = true; |
| |
| mp->hw = hw; |
| mp->update_interval = HZ / 20; |
| |
| minstrel_ht_init_cck_rates(mp); |
| for (i = 0; i < ARRAY_SIZE(mp->hw->wiphy->bands); i++) |
| minstrel_ht_init_ofdm_rates(mp, i); |
| |
| return mp; |
| } |
| |
| #ifdef CONFIG_MAC80211_DEBUGFS |
| static void minstrel_ht_add_debugfs(struct ieee80211_hw *hw, void *priv, |
| struct dentry *debugfsdir) |
| { |
| struct minstrel_priv *mp = priv; |
| |
| mp->fixed_rate_idx = (u32) -1; |
| debugfs_create_u32("fixed_rate_idx", S_IRUGO | S_IWUGO, debugfsdir, |
| &mp->fixed_rate_idx); |
| } |
| #endif |
| |
| static void |
| minstrel_ht_free(void *priv) |
| { |
| kfree(priv); |
| } |
| |
| static u32 minstrel_ht_get_expected_throughput(void *priv_sta) |
| { |
| struct minstrel_ht_sta *mi = priv_sta; |
| int i, j, prob, tp_avg; |
| |
| i = MI_RATE_GROUP(mi->max_tp_rate[0]); |
| j = MI_RATE_IDX(mi->max_tp_rate[0]); |
| prob = mi->groups[i].rates[j].prob_avg; |
| |
| /* convert tp_avg from pkt per second in kbps */ |
| tp_avg = minstrel_ht_get_tp_avg(mi, i, j, prob) * 10; |
| tp_avg = tp_avg * AVG_PKT_SIZE * 8 / 1024; |
| |
| return tp_avg; |
| } |
| |
| static const struct rate_control_ops mac80211_minstrel_ht = { |
| .name = "minstrel_ht", |
| .tx_status_ext = minstrel_ht_tx_status, |
| .get_rate = minstrel_ht_get_rate, |
| .rate_init = minstrel_ht_rate_init, |
| .rate_update = minstrel_ht_rate_update, |
| .alloc_sta = minstrel_ht_alloc_sta, |
| .free_sta = minstrel_ht_free_sta, |
| .alloc = minstrel_ht_alloc, |
| .free = minstrel_ht_free, |
| #ifdef CONFIG_MAC80211_DEBUGFS |
| .add_debugfs = minstrel_ht_add_debugfs, |
| .add_sta_debugfs = minstrel_ht_add_sta_debugfs, |
| #endif |
| .get_expected_throughput = minstrel_ht_get_expected_throughput, |
| }; |
| |
| |
| static void __init init_sample_table(void) |
| { |
| int col, i, new_idx; |
| u8 rnd[MCS_GROUP_RATES]; |
| |
| memset(sample_table, 0xff, sizeof(sample_table)); |
| for (col = 0; col < SAMPLE_COLUMNS; col++) { |
| prandom_bytes(rnd, sizeof(rnd)); |
| for (i = 0; i < MCS_GROUP_RATES; i++) { |
| new_idx = (i + rnd[i]) % MCS_GROUP_RATES; |
| while (sample_table[col][new_idx] != 0xff) |
| new_idx = (new_idx + 1) % MCS_GROUP_RATES; |
| |
| sample_table[col][new_idx] = i; |
| } |
| } |
| } |
| |
| int __init |
| rc80211_minstrel_init(void) |
| { |
| init_sample_table(); |
| return ieee80211_rate_control_register(&mac80211_minstrel_ht); |
| } |
| |
| void |
| rc80211_minstrel_exit(void) |
| { |
| ieee80211_rate_control_unregister(&mac80211_minstrel_ht); |
| } |