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openwrtv4/package/kernel/mac80211/patches/334-mac80211-minstrel_ht-move-supported-bitrate-mask-out.patch
Felix Fietkau 00bc7f0357 mac80211: merge a number of minstrel/minstrel_ht performance and memory usage improvements 
Signed-off-by: Felix Fietkau <nbd@nbd.name>
2016-12-19 13:51:21 +01:00

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From: Felix Fietkau <nbd@nbd.name>
Date: Wed, 14 Dec 2016 19:33:23 +0100
Subject: [PATCH] mac80211: minstrel_ht: move supported bitrate mask out of
group data
Improves dcache footprint by ensuring that fewer cache lines need to be
touched.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -301,7 +301,7 @@ minstrel_ht_get_stats(struct minstrel_pr
break;
/* short preamble */
- if (!(mi->groups[group].supported & BIT(idx)))
+ if (!(mi->supported[group] & BIT(idx)))
idx += 4;
}
return &mi->groups[group].rates[idx];
@@ -486,7 +486,7 @@ minstrel_ht_prob_rate_reduce_streams(str
MCS_GROUP_RATES].streams;
for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) {
mg = &mi->groups[group];
- if (!mg->supported || group == MINSTREL_CCK_GROUP)
+ if (!mi->supported[group] || group == MINSTREL_CCK_GROUP)
continue;
tmp_idx = mg->max_group_prob_rate % MCS_GROUP_RATES;
@@ -540,7 +540,7 @@ minstrel_ht_update_stats(struct minstrel
for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) {
mg = &mi->groups[group];
- if (!mg->supported)
+ if (!mi->supported[group])
continue;
mi->sample_count++;
@@ -550,7 +550,7 @@ minstrel_ht_update_stats(struct minstrel
tmp_group_tp_rate[j] = group;
for (i = 0; i < MCS_GROUP_RATES; i++) {
- if (!(mg->supported & BIT(i)))
+ if (!(mi->supported[group] & BIT(i)))
continue;
index = MCS_GROUP_RATES * group + i;
@@ -636,7 +636,7 @@ minstrel_set_next_sample_idx(struct mins
mi->sample_group %= ARRAY_SIZE(minstrel_mcs_groups);
mg = &mi->groups[mi->sample_group];
- if (!mg->supported)
+ if (!mi->supported[mi->sample_group])
continue;
if (++mg->index >= MCS_GROUP_RATES) {
@@ -657,7 +657,7 @@ minstrel_downgrade_rate(struct minstrel_
while (group > 0) {
group--;
- if (!mi->groups[group].supported)
+ if (!mi->supported[group])
continue;
if (minstrel_mcs_groups[group].streams >
@@ -994,7 +994,7 @@ minstrel_get_sample_rate(struct minstrel
sample_idx = sample_table[mg->column][mg->index];
minstrel_set_next_sample_idx(mi);
- if (!(mg->supported & BIT(sample_idx)))
+ if (!(mi->supported[sample_group] & BIT(sample_idx)))
return -1;
mrs = &mg->rates[sample_idx];
@@ -1052,7 +1052,7 @@ static void
minstrel_ht_check_cck_shortpreamble(struct minstrel_priv *mp,
struct minstrel_ht_sta *mi, bool val)
{
- u8 supported = mi->groups[MINSTREL_CCK_GROUP].supported;
+ u8 supported = mi->supported[MINSTREL_CCK_GROUP];
if (!supported || !mi->cck_supported_short)
return;
@@ -1061,7 +1061,7 @@ minstrel_ht_check_cck_shortpreamble(stru
return;
supported ^= mi->cck_supported_short | (mi->cck_supported_short << 4);
- mi->groups[MINSTREL_CCK_GROUP].supported = supported;
+ mi->supported[MINSTREL_CCK_GROUP] = supported;
}
static void
@@ -1154,7 +1154,7 @@ minstrel_ht_update_cck(struct minstrel_p
mi->cck_supported_short |= BIT(i);
}
- mi->groups[MINSTREL_CCK_GROUP].supported = mi->cck_supported;
+ mi->supported[MINSTREL_CCK_GROUP] = mi->cck_supported;
}
static void
@@ -1233,7 +1233,7 @@ minstrel_ht_update_caps(void *priv, stru
u32 gflags = minstrel_mcs_groups[i].flags;
int bw, nss;
- mi->groups[i].supported = 0;
+ mi->supported[i] = 0;
if (i == MINSTREL_CCK_GROUP) {
minstrel_ht_update_cck(mp, mi, sband, sta);
continue;
@@ -1265,8 +1265,8 @@ minstrel_ht_update_caps(void *priv, stru
if (use_vht && minstrel_vht_only)
continue;
#endif
- mi->groups[i].supported = mcs->rx_mask[nss - 1];
- if (mi->groups[i].supported)
+ mi->supported[i] = mcs->rx_mask[nss - 1];
+ if (mi->supported[i])
n_supported++;
continue;
}
@@ -1292,10 +1292,10 @@ minstrel_ht_update_caps(void *priv, stru
else
bw = BW_20;
- mi->groups[i].supported = minstrel_get_valid_vht_rates(bw, nss,
+ mi->supported[i] = minstrel_get_valid_vht_rates(bw, nss,
vht_cap->vht_mcs.tx_mcs_map);
- if (mi->groups[i].supported)
+ if (mi->supported[i])
n_supported++;
}
--- a/net/mac80211/rc80211_minstrel_ht.h
+++ b/net/mac80211/rc80211_minstrel_ht.h
@@ -52,9 +52,6 @@ struct minstrel_mcs_group_data {
u8 index;
u8 column;
- /* bitfield of supported MCS rates of this group */
- u16 supported;
-
/* sorted rate set within a MCS group*/
u16 max_group_tp_rate[MAX_THR_RATES];
u16 max_group_prob_rate;
@@ -101,6 +98,9 @@ struct minstrel_ht_sta {
u8 cck_supported;
u8 cck_supported_short;
+ /* Bitfield of supported MCS rates of all groups */
+ u16 supported[MINSTREL_GROUPS_NB];
+
/* MCS rate group info and statistics */
struct minstrel_mcs_group_data groups[MINSTREL_GROUPS_NB];
};
--- a/net/mac80211/rc80211_minstrel_ht_debugfs.c
+++ b/net/mac80211/rc80211_minstrel_ht_debugfs.c
@@ -24,7 +24,7 @@ minstrel_ht_stats_dump(struct minstrel_h
char gimode = 'L';
u32 gflags;
- if (!mi->groups[i].supported)
+ if (!mi->supported[i])
return p;
mg = &minstrel_mcs_groups[i];
@@ -42,7 +42,7 @@ minstrel_ht_stats_dump(struct minstrel_h
static const int bitrates[4] = { 10, 20, 55, 110 };
int idx = i * MCS_GROUP_RATES + j;
- if (!(mi->groups[i].supported & BIT(j)))
+ if (!(mi->supported[i] & BIT(j)))
continue;
if (gflags & IEEE80211_TX_RC_MCS) {
@@ -170,7 +170,7 @@ minstrel_ht_stats_csv_dump(struct minstr
char gimode = 'L';
u32 gflags;
- if (!mi->groups[i].supported)
+ if (!mi->supported[i])
return p;
mg = &minstrel_mcs_groups[i];
@@ -188,7 +188,7 @@ minstrel_ht_stats_csv_dump(struct minstr
static const int bitrates[4] = { 10, 20, 55, 110 };
int idx = i * MCS_GROUP_RATES + j;
- if (!(mi->groups[i].supported & BIT(j)))
+ if (!(mi->supported[i] & BIT(j)))
continue;
if (gflags & IEEE80211_TX_RC_MCS) {
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