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mac80211: add more minstrel fixes

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Improves 2.4 GHz throughput

Signed-off-by: Felix Fietkau <nbd@nbd.name>
v19.07.3_mercusys_ac12_duma
Felix Fietkau 6 years ago
parent 55bd80f6d8
commit d59c6b53f4
4 changed files with 154 additions and 19 deletions
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94
package/kernel/mac80211/patches/328-mac80211-minstrel-reduce-minstrel_mcs_groups-size.patch
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@ -218,21 +218,53 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
/*
* For the throughput calculation, limit the probability value to 90% to
@@ -780,7 +784,7 @@ minstrel_calc_retransmit(struct minstrel
@@ -755,12 +759,19 @@ minstrel_ht_tx_status(void *priv, struct
minstrel_ht_update_rates(mp, mi);
}
+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];
+ return duration << group->shift;
+}
+
static void
minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
int index)
{
struct minstrel_rate_stats *mrs;
- const struct mcs_group *group;
unsigned int tx_time, tx_time_rtscts, tx_time_data;
unsigned int cw = mp->cw_min;
unsigned int ctime = 0;
@@ -779,8 +790,7 @@ minstrel_calc_retransmit(struct minstrel
mrs->retry_count_rtscts = 2;
mrs->retry_updated = true;
group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
- group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
- tx_time_data = group->duration[index % MCS_GROUP_RATES] * ampdu_len / 1000;
+ tx_time_data = (group->duration[index % MCS_GROUP_RATES] << group->shift) * ampdu_len / 1000;
+ tx_time_data = minstrel_get_duration(index) * ampdu_len / 1000;
/* Contention time for first 2 tries */
ctime = (t_slot * cw) >> 1;
@@ -880,14 +884,14 @@ minstrel_ht_get_max_amsdu_len(struct min
@@ -874,20 +884,24 @@ minstrel_ht_get_max_amsdu_len(struct min
int group = mi->max_prob_rate / MCS_GROUP_RATES;
const struct mcs_group *g = &minstrel_mcs_groups[group];
int rate = mi->max_prob_rate % MCS_GROUP_RATES;
+ unsigned int duration;
/* Disable A-MSDU if max_prob_rate is bad */
if (mi->groups[group].rates[rate].prob_ewma < 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 (g->duration[rate] > MCS_DURATION(1, 0, 52))
+ if ((g->duration[rate] << g->shift) > MCS_DURATION(1, 0, 52))
+ if (duration > MCS_DURATION(1, 0, 52))
return 500;
/*
@ -240,28 +272,33 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
* data packet size
*/
- if (g->duration[rate] > MCS_DURATION(1, 0, 104))
+ if ((g->duration[rate] << g->shift) > MCS_DURATION(1, 0, 104))
+ if (duration > MCS_DURATION(1, 0, 104))
return 1600;
/*
@@ -895,7 +899,7 @@ minstrel_ht_get_max_amsdu_len(struct min
@@ -895,7 +909,7 @@ minstrel_ht_get_max_amsdu_len(struct min
* rate success probability is less than 75%, limit A-MSDU to twice the usual
* data packet size
*/
- if (g->duration[rate] > MCS_DURATION(1, 0, 260) ||
+ if ((g->duration[rate] << g->shift) > MCS_DURATION(1, 0, 260) ||
+ if (duration > MCS_DURATION(1, 0, 260) ||
(minstrel_ht_get_prob_ewma(mi, mi->max_tp_rate[0]) <
MINSTREL_FRAC(75, 100)))
return 3200;
@@ -946,7 +950,7 @@ static inline int
minstrel_get_duration(int index)
{
const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
- return group->duration[index % MCS_GROUP_RATES];
+ return group->duration[index % MCS_GROUP_RATES] << group->shift;
@@ -942,13 +956,6 @@ minstrel_ht_update_rates(struct minstrel
rate_control_set_rates(mp->hw, mi->sta, rates);
}
-static inline int
-minstrel_get_duration(int index)
-{
- const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
- return group->duration[index % MCS_GROUP_RATES];
-}
-
static int
minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
{
--- a/net/mac80211/rc80211_minstrel_ht.h
+++ b/net/mac80211/rc80211_minstrel_ht.h
@@ -33,9 +33,10 @@
@ -280,21 +317,42 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
extern const struct mcs_group minstrel_mcs_groups[];
--- a/net/mac80211/rc80211_minstrel_ht_debugfs.c
+++ b/net/mac80211/rc80211_minstrel_ht_debugfs.c
@@ -95,7 +95,7 @@ minstrel_ht_stats_dump(struct minstrel_h
@@ -58,6 +58,7 @@ minstrel_ht_stats_dump(struct minstrel_h
static const int bitrates[4] = { 10, 20, 55, 110 };
int idx = i * MCS_GROUP_RATES + j;
unsigned int prob_ewmsd;
+ unsigned int duration;
if (!(mi->supported[i] & BIT(j)))
continue;
@@ -95,7 +96,9 @@ minstrel_ht_stats_dump(struct minstrel_h
p += sprintf(p, " %3u ", idx);
/* tx_time[rate(i)] in usec */
- tx_time = DIV_ROUND_CLOSEST(mg->duration[j], 1000);
+ tx_time = DIV_ROUND_CLOSEST(mg->duration[j] << mg->shift, 1000);
+ duration = mg->duration[j];
+ duration <<= mg->shift;
+ tx_time = DIV_ROUND_CLOSEST(duration, 1000);
p += sprintf(p, "%6u ", tx_time);
tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));
@@ -238,7 +238,7 @@ minstrel_ht_stats_csv_dump(struct minstr
@@ -204,6 +207,7 @@ minstrel_ht_stats_csv_dump(struct minstr
static const int bitrates[4] = { 10, 20, 55, 110 };
int idx = i * MCS_GROUP_RATES + j;
unsigned int prob_ewmsd;
+ unsigned int duration;
if (!(mi->supported[i] & BIT(j)))
continue;
@@ -238,7 +242,10 @@ minstrel_ht_stats_csv_dump(struct minstr
}
p += sprintf(p, "%u,", idx);
- tx_time = DIV_ROUND_CLOSEST(mg->duration[j], 1000);
+ tx_time = DIV_ROUND_CLOSEST(mg->duration[j] << mg->shift, 1000);
+
+ duration = mg->duration[j];
+ duration <<= mg->shift;
+ tx_time = DIV_ROUND_CLOSEST(duration, 1000);
p += sprintf(p, "%u,", tx_time);
tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));

2
package/kernel/mac80211/patches/329-mac80211-minstrel-fix-using-short-preamble-CCK-rates.patch
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@ -11,7 +11,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -1265,7 +1265,8 @@ minstrel_ht_update_caps(void *priv, stru
@@ -1268,7 +1268,8 @@ minstrel_ht_update_caps(void *priv, stru
goto use_legacy;
if (test_sta_flag(sinfo, WLAN_STA_SHORT_PREAMBLE))

20
package/kernel/mac80211/patches/336-mac80211-minstrel-fix-CCK-rate-group-streams-value.patch
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@ -0,0 +1,20 @@
From: Felix Fietkau <nbd@nbd.name>
Date: Thu, 1 Mar 2018 13:27:54 +0100
Subject: [PATCH] mac80211: minstrel: fix CCK rate group streams value
Fixes a harmless underflow issue when CCK rates are actively being used
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -131,7 +131,7 @@
#define CCK_GROUP(_s) \
[MINSTREL_CCK_GROUP] = { \
- .streams = 0, \
+ .streams = 1, \
.flags = 0, \
.shift = _s, \
.duration = { \

57
package/kernel/mac80211/patches/337-mac80211-minstrel-fix-sampling-reporting-of-CCK-rate.patch
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@ -0,0 +1,57 @@
From: Felix Fietkau <nbd@nbd.name>
Date: Thu, 1 Mar 2018 13:28:48 +0100
Subject: [PATCH] mac80211: minstrel: fix sampling/reporting of CCK rates
in HT mode
Long/short preamble selection cannot be sampled separately, since it
depends on the BSS state. Because of that, sampling attempts to
currently not used preamble modes are not counted in the statistics,
which leads to CCK rates being sampled too often.
Fix statistics accounting for long/short preamble by increasing the
index where necessary.
Fix excessive CCK rate sampling by dropping unsupported sample attempts.
This improves throughput on 2.4 GHz channels
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -281,7 +281,8 @@ minstrel_ht_get_stats(struct minstrel_pr
break;
/* short preamble */
- if (!(mi->supported[group] & BIT(idx)))
+ if ((mi->supported[group] & BIT(idx + 4)) &&
+ (rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE))
idx += 4;
}
return &mi->groups[group].rates[idx];
@@ -1080,18 +1081,22 @@ minstrel_ht_get_rate(void *priv, struct
return;
sample_group = &minstrel_mcs_groups[sample_idx / MCS_GROUP_RATES];
+ sample_idx %= MCS_GROUP_RATES;
+
+ if ((sample_idx >= 4) != txrc->short_preamble)
+ return;
+
info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
rate->count = 1;
- if (sample_idx / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) {
+ 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->flags & IEEE80211_TX_RC_VHT_MCS) {
ieee80211_rate_set_vht(rate, sample_idx % MCS_GROUP_RATES,
sample_group->streams);
} else {
- rate->idx = sample_idx % MCS_GROUP_RATES +
- (sample_group->streams - 1) * 8;
+ rate->idx = sample_idx + (sample_group->streams - 1) * 8;
}
rate->flags = sample_group->flags;
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