diff options
Diffstat (limited to 'package/kernel/mac80211/patches/subsys/346-mac80211-minstrel_ht-use-bitfields-to-encode-rate-in.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/subsys/346-mac80211-minstrel_ht-use-bitfields-to-encode-rate-in.patch | 409 |
1 files changed, 409 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/subsys/346-mac80211-minstrel_ht-use-bitfields-to-encode-rate-in.patch b/package/kernel/mac80211/patches/subsys/346-mac80211-minstrel_ht-use-bitfields-to-encode-rate-in.patch new file mode 100644 index 0000000000..a17725d69b --- /dev/null +++ b/package/kernel/mac80211/patches/subsys/346-mac80211-minstrel_ht-use-bitfields-to-encode-rate-in.patch @@ -0,0 +1,409 @@ +From: Felix Fietkau <nbd@nbd.name> +Date: Thu, 21 Jan 2021 18:29:30 +0100 +Subject: [PATCH] mac80211: minstrel_ht: use bitfields to encode rate + indexes + +Get rid of a lot of divisions and modulo operations +Reduces code size and improves performance + +Signed-off-by: Felix Fietkau <nbd@nbd.name> +--- + +--- a/net/mac80211/rc80211_minstrel_ht.c ++++ b/net/mac80211/rc80211_minstrel_ht.c +@@ -379,14 +379,14 @@ out: + static inline struct minstrel_rate_stats * + minstrel_get_ratestats(struct minstrel_ht_sta *mi, int index) + { +- return &mi->groups[index / MCS_GROUP_RATES].rates[index % MCS_GROUP_RATES]; ++ return &mi->groups[MI_RATE_GROUP(index)].rates[MI_RATE_IDX(index)]; + } + +-static inline int +-minstrel_get_duration(int index) ++static inline int minstrel_get_duration(int index) + { +- const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; +- unsigned int duration = group->duration[index % MCS_GROUP_RATES]; ++ 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; + } + +@@ -398,7 +398,7 @@ minstrel_ht_avg_ampdu_len(struct minstre + if (mi->avg_ampdu_len) + return MINSTREL_TRUNC(mi->avg_ampdu_len); + +- if (minstrel_ht_is_legacy_group(mi->max_tp_rate[0] / MCS_GROUP_RATES)) ++ 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]); +@@ -465,14 +465,14 @@ minstrel_ht_sort_best_tp_rates(struct mi + int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob; + int j = MAX_THR_RATES; + +- cur_group = index / MCS_GROUP_RATES; +- cur_idx = index % MCS_GROUP_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 = tp_list[j - 1] / MCS_GROUP_RATES; +- tmp_idx = tp_list[j - 1] % MCS_GROUP_RATES; ++ 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); +@@ -504,23 +504,23 @@ minstrel_ht_set_best_prob_rate(struct mi + int max_gpr_group, max_gpr_idx; + int max_gpr_tp_avg, max_gpr_prob; + +- cur_group = index / MCS_GROUP_RATES; +- cur_idx = index % MCS_GROUP_RATES; +- mg = &mi->groups[index / MCS_GROUP_RATES]; +- mrs = &mg->rates[index % MCS_GROUP_RATES]; ++ cur_group = MI_RATE_GROUP(index); ++ cur_idx = MI_RATE_IDX(index); ++ mg = &mi->groups[cur_group]; ++ mrs = &mg->rates[cur_idx]; + +- tmp_group = *dest / MCS_GROUP_RATES; +- tmp_idx = *dest % MCS_GROUP_RATES; ++ 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->max_tp_rate[0] / MCS_GROUP_RATES; +- max_tp_idx = mi->max_tp_rate[0] % MCS_GROUP_RATES; ++ 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(index / MCS_GROUP_RATES) && ++ if (minstrel_ht_is_legacy_group(MI_RATE_GROUP(index)) && + !minstrel_ht_is_legacy_group(max_tp_group)) + return; + +@@ -529,8 +529,8 @@ minstrel_ht_set_best_prob_rate(struct mi + mrs->prob_avg < max_tp_prob) + return; + +- max_gpr_group = mg->max_group_prob_rate / MCS_GROUP_RATES; +- max_gpr_idx = mg->max_group_prob_rate % MCS_GROUP_RATES; ++ 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)) { +@@ -567,13 +567,13 @@ minstrel_ht_assign_best_tp_rates(struct + unsigned int tmp_group, tmp_idx, tmp_cck_tp, tmp_mcs_tp, tmp_prob; + int i; + +- tmp_group = tmp_legacy_tp_rate[0] / MCS_GROUP_RATES; +- tmp_idx = tmp_legacy_tp_rate[0] % MCS_GROUP_RATES; ++ 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 = tmp_mcs_tp_rate[0] / MCS_GROUP_RATES; +- tmp_idx = tmp_mcs_tp_rate[0] % MCS_GROUP_RATES; ++ 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); + +@@ -600,14 +600,14 @@ minstrel_ht_prob_rate_reduce_streams(str + if (!mi->sta->ht_cap.ht_supported) + return; + +- tmp_max_streams = minstrel_mcs_groups[mi->max_tp_rate[0] / +- MCS_GROUP_RATES].streams; ++ 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 = mg->max_group_prob_rate % MCS_GROUP_RATES; ++ 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) && +@@ -644,8 +644,8 @@ minstrel_ht_find_probe_rates(struct mins + int i, g, max_dur; + int tp_idx; + +- tp_group = &minstrel_mcs_groups[mi->max_tp_rate[0] / MCS_GROUP_RATES]; +- tp_idx = mi->max_tp_rate[0] % MCS_GROUP_RATES; ++ tp_group = &minstrel_mcs_groups[MI_RATE_GROUP(mi->max_tp_rate[0])]; ++ tp_idx = MI_RATE_IDX(mi->max_tp_rate[0]); + + max_dur = minstrel_get_duration(mi->max_tp_rate[0]); + if (faster_rate) +@@ -670,7 +670,7 @@ minstrel_ht_find_probe_rates(struct mins + if ((group->duration[i] << group->shift) > max_dur) + continue; + +- idx = g * MCS_GROUP_RATES + i; ++ idx = MI_RATE(g, i); + if (idx == mi->max_tp_rate[0]) + continue; + +@@ -712,10 +712,10 @@ minstrel_ht_rate_sample_switch(struct mi + + /* If no suitable rate was found, try to pick the next one in the group */ + if (!n_rates) { +- int g_idx = mi->max_tp_rate[0] / MCS_GROUP_RATES; ++ int g_idx = MI_RATE_GROUP(mi->max_tp_rate[0]); + u16 supported = mi->supported[g_idx]; + +- supported >>= mi->max_tp_rate[0] % MCS_GROUP_RATES; ++ supported >>= MI_RATE_IDX(mi->max_tp_rate[0]); + for (i = 0; supported; supported >>= 1, i++) { + if (!(supported & 1)) + continue; +@@ -856,22 +856,26 @@ minstrel_ht_update_stats(struct minstrel + + memset(tmp_mcs_tp_rate, 0, sizeof(tmp_mcs_tp_rate)); + memset(tmp_legacy_tp_rate, 0, sizeof(tmp_legacy_tp_rate)); ++ + if (mi->supported[MINSTREL_CCK_GROUP]) +- for (j = 0; j < ARRAY_SIZE(tmp_legacy_tp_rate); j++) +- tmp_legacy_tp_rate[j] = MINSTREL_CCK_GROUP * MCS_GROUP_RATES; ++ group = MINSTREL_CCK_GROUP; + else if (mi->supported[MINSTREL_OFDM_GROUP]) +- for (j = 0; j < ARRAY_SIZE(tmp_legacy_tp_rate); j++) +- tmp_legacy_tp_rate[j] = MINSTREL_OFDM_GROUP * MCS_GROUP_RATES; ++ group = MINSTREL_OFDM_GROUP; ++ ++ 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]) +- index = MINSTREL_VHT_GROUP_0 * MCS_GROUP_RATES; ++ group = MINSTREL_VHT_GROUP_0; + else if (ht_supported) +- index = MINSTREL_HT_GROUP_0 * MCS_GROUP_RATES; ++ group = MINSTREL_HT_GROUP_0; + else if (mi->supported[MINSTREL_CCK_GROUP]) +- index = MINSTREL_CCK_GROUP * MCS_GROUP_RATES; ++ group = MINSTREL_CCK_GROUP; + else +- index = MINSTREL_OFDM_GROUP * MCS_GROUP_RATES; ++ 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; +@@ -888,7 +892,7 @@ minstrel_ht_update_stats(struct minstrel + + /* (re)Initialize group rate indexes */ + for(j = 0; j < MAX_THR_RATES; j++) +- tmp_group_tp_rate[j] = MCS_GROUP_RATES * group; ++ tmp_group_tp_rate[j] = MI_RATE(group, 0); + + if (group == MINSTREL_CCK_GROUP && ht_supported) + tp_rate = tmp_legacy_tp_rate; +@@ -897,7 +901,7 @@ minstrel_ht_update_stats(struct minstrel + if (!(mi->supported[group] & BIT(i))) + continue; + +- index = MCS_GROUP_RATES * group + i; ++ index = MI_RATE(group, i); + + mrs = &mg->rates[i]; + mrs->retry_updated = false; +@@ -929,13 +933,13 @@ minstrel_ht_update_stats(struct minstrel + continue; + + mg = &mi->groups[group]; +- mg->max_group_prob_rate = MCS_GROUP_RATES * 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 = MCS_GROUP_RATES * group + i; ++ index = MI_RATE(group, i); + + /* Find max probability rate per group and global */ + minstrel_ht_set_best_prob_rate(mi, &tmp_max_prob_rate, +@@ -1022,7 +1026,7 @@ minstrel_downgrade_rate(struct minstrel_ + { + int group, orig_group; + +- orig_group = group = *idx / MCS_GROUP_RATES; ++ orig_group = group = MI_RATE_GROUP(*idx); + while (group > 0) { + group--; + +@@ -1206,7 +1210,7 @@ minstrel_calc_retransmit(struct minstrel + ctime += (t_slot * cw) >> 1; + cw = min((cw << 1) | 1, mp->cw_max); + +- if (minstrel_ht_is_legacy_group(index / MCS_GROUP_RATES)) { ++ if (minstrel_ht_is_legacy_group(MI_RATE_GROUP(index))) { + overhead = mi->overhead_legacy; + overhead_rtscts = mi->overhead_legacy_rtscts; + } else { +@@ -1239,7 +1243,7 @@ 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 = index / MCS_GROUP_RATES; ++ int group_idx = MI_RATE_GROUP(index); + const struct mcs_group *group = &minstrel_mcs_groups[group_idx]; + struct minstrel_rate_stats *mrs; + u8 idx; +@@ -1259,7 +1263,7 @@ minstrel_ht_set_rate(struct minstrel_pri + ratetbl->rate[offset].count_rts = mrs->retry_count_rtscts; + } + +- index %= MCS_GROUP_RATES; ++ 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) +@@ -1289,17 +1293,17 @@ minstrel_ht_set_rate(struct minstrel_pri + static inline int + minstrel_ht_get_prob_avg(struct minstrel_ht_sta *mi, int rate) + { +- int group = rate / MCS_GROUP_RATES; +- rate %= MCS_GROUP_RATES; ++ 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->max_prob_rate / MCS_GROUP_RATES; ++ int group = MI_RATE_GROUP(mi->max_prob_rate); + const struct mcs_group *g = &minstrel_mcs_groups[group]; +- int rate = mi->max_prob_rate % MCS_GROUP_RATES; ++ int rate = MI_RATE_IDX(mi->max_prob_rate); + unsigned int duration; + + /* Disable A-MSDU if max_prob_rate is bad */ +@@ -1405,7 +1409,7 @@ minstrel_get_sample_rate(struct minstrel + return -1; + + mrs = &mg->rates[sample_idx]; +- sample_idx += sample_group * MCS_GROUP_RATES; ++ sample_idx += MI_RATE(sample_group, 0); + + tp_rate1 = mi->max_tp_rate[0]; + +@@ -1455,8 +1459,7 @@ minstrel_get_sample_rate(struct minstrel + * if the link is working perfectly. + */ + +- cur_max_tp_streams = minstrel_mcs_groups[tp_rate1 / +- MCS_GROUP_RATES].streams; ++ cur_max_tp_streams = minstrel_mcs_groups[MI_RATE_GROUP(tp_rate1)].streams; + if (sample_dur >= minstrel_get_duration(tp_rate2) && + (cur_max_tp_streams - 1 < + minstrel_mcs_groups[sample_group].streams || +@@ -1484,7 +1487,7 @@ minstrel_ht_get_rate(void *priv, struct + int sample_idx; + + if (!(info->flags & IEEE80211_TX_CTL_AMPDU) && +- !minstrel_ht_is_legacy_group(mi->max_prob_rate / MCS_GROUP_RATES)) ++ !minstrel_ht_is_legacy_group(MI_RATE_GROUP(mi->max_prob_rate))) + minstrel_aggr_check(sta, txrc->skb); + + info->flags |= mi->tx_flags; +@@ -1512,8 +1515,8 @@ minstrel_ht_get_rate(void *priv, struct + if (sample_idx < 0) + return; + +- sample_group = &minstrel_mcs_groups[sample_idx / MCS_GROUP_RATES]; +- sample_idx %= MCS_GROUP_RATES; ++ 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) +@@ -1529,7 +1532,7 @@ minstrel_ht_get_rate(void *priv, struct + 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, sample_idx % MCS_GROUP_RATES, ++ ieee80211_rate_set_vht(rate, MI_RATE_IDX(sample_idx), + sample_group->streams); + } else { + rate->idx = sample_idx + (sample_group->streams - 1) * 8; +@@ -1898,8 +1901,8 @@ static u32 minstrel_ht_get_expected_thro + struct minstrel_ht_sta *mi = priv_sta; + int i, j, prob, tp_avg; + +- i = mi->max_tp_rate[0] / MCS_GROUP_RATES; +- j = mi->max_tp_rate[0] % MCS_GROUP_RATES; ++ 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 */ +--- a/net/mac80211/rc80211_minstrel_ht.h ++++ b/net/mac80211/rc80211_minstrel_ht.h +@@ -6,6 +6,8 @@ + #ifndef __RC_MINSTREL_HT_H + #define __RC_MINSTREL_HT_H + ++#include <linux/bitfield.h> ++ + /* number of highest throughput rates to consider*/ + #define MAX_THR_RATES 4 + #define SAMPLE_COLUMNS 10 /* number of columns in sample table */ +@@ -57,6 +59,17 @@ + + #define MCS_GROUP_RATES 10 + ++#define MI_RATE_IDX_MASK GENMASK(3, 0) ++#define MI_RATE_GROUP_MASK GENMASK(15, 4) ++ ++#define MI_RATE(_group, _idx) \ ++ (FIELD_PREP(MI_RATE_GROUP_MASK, _group) | \ ++ FIELD_PREP(MI_RATE_IDX_MASK, _idx)) ++ ++#define MI_RATE_IDX(_rate) FIELD_GET(MI_RATE_IDX_MASK, _rate) ++#define MI_RATE_GROUP(_rate) FIELD_GET(MI_RATE_GROUP_MASK, _rate) ++ ++ + struct minstrel_priv { + struct ieee80211_hw *hw; + bool has_mrr; +--- a/net/mac80211/rc80211_minstrel_ht_debugfs.c ++++ b/net/mac80211/rc80211_minstrel_ht_debugfs.c +@@ -56,7 +56,7 @@ minstrel_ht_stats_dump(struct minstrel_h + + for (j = 0; j < MCS_GROUP_RATES; j++) { + struct minstrel_rate_stats *mrs = &mi->groups[i].rates[j]; +- int idx = i * MCS_GROUP_RATES + j; ++ int idx = MI_RATE(i, j); + unsigned int duration; + + if (!(mi->supported[i] & BIT(j))) +@@ -201,7 +201,7 @@ minstrel_ht_stats_csv_dump(struct minstr + + for (j = 0; j < MCS_GROUP_RATES; j++) { + struct minstrel_rate_stats *mrs = &mi->groups[i].rates[j]; +- int idx = i * MCS_GROUP_RATES + j; ++ int idx = MI_RATE(i, j); + unsigned int duration; + + if (!(mi->supported[i] & BIT(j))) |