diff options
Diffstat (limited to 'package/kernel/mac80211/patches/subsys/351-mac80211-minstrel_ht-remove-sample-rate-switching-co.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/subsys/351-mac80211-minstrel_ht-remove-sample-rate-switching-co.patch | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/subsys/351-mac80211-minstrel_ht-remove-sample-rate-switching-co.patch b/package/kernel/mac80211/patches/subsys/351-mac80211-minstrel_ht-remove-sample-rate-switching-co.patch new file mode 100644 index 0000000000..64bd59b852 --- /dev/null +++ b/package/kernel/mac80211/patches/subsys/351-mac80211-minstrel_ht-remove-sample-rate-switching-co.patch @@ -0,0 +1,279 @@ +From: Felix Fietkau <nbd@nbd.name> +Date: Sat, 23 Jan 2021 07:18:26 +0100 +Subject: [PATCH] mac80211: minstrel_ht: remove sample rate switching code for + constrained devices + +This was added to mitigate the effects of too much sampling on devices that +use a static global fallback table instead of configurable multi-rate retry. +Now that the sampling algorithm is improved, this code path no longer performs +any better than the standard probing on affected devices. + +Signed-off-by: Felix Fietkau <nbd@nbd.name> +--- + +--- a/net/mac80211/rc80211_minstrel_ht.c ++++ b/net/mac80211/rc80211_minstrel_ht.c +@@ -648,27 +648,6 @@ __minstrel_ht_get_sample_rate(struct min + return 0; + } + +-static void +-minstrel_ht_rate_sample_switch(struct minstrel_priv *mp, +- struct minstrel_ht_sta *mi) +-{ +- u16 rate; +- +- /* +- * Use rate switching instead of probing packets for devices with +- * little control over retry fallback behavior +- */ +- if (mp->hw->max_rates > 1) +- return; +- +- rate = __minstrel_ht_get_sample_rate(mi, MINSTREL_SAMPLE_TYPE_INC); +- if (!rate) +- return; +- +- mi->sample_rate = rate; +- mi->sample_mode = MINSTREL_SAMPLE_ACTIVE; +-} +- + static inline int + minstrel_ewma(int old, int new, int weight) + { +@@ -1012,8 +991,7 @@ minstrel_ht_refill_sample_rates(struct m + * 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, +- bool sample) ++minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) + { + struct minstrel_mcs_group_data *mg; + struct minstrel_rate_stats *mrs; +@@ -1023,18 +1001,6 @@ minstrel_ht_update_stats(struct minstrel + u16 index; + bool ht_supported = mi->sta->ht_cap.ht_supported; + +- mi->sample_mode = MINSTREL_SAMPLE_IDLE; +- +- if (sample) { +- mi->total_packets_cur = mi->total_packets - +- mi->total_packets_last; +- mi->total_packets_last = mi->total_packets; +- } +- if (!mp->sample_switch) +- sample = false; +- if (mi->total_packets_cur < SAMPLE_SWITCH_THR && mp->sample_switch != 1) +- sample = false; +- + 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, +@@ -1149,16 +1115,12 @@ minstrel_ht_update_stats(struct minstrel + minstrel_ht_prob_rate_reduce_streams(mi); + minstrel_ht_refill_sample_rates(mi); + +- if (sample) +- minstrel_ht_rate_sample_switch(mp, mi); +- + #ifdef CPTCFG_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; +- mi->sample_mode = MINSTREL_SAMPLE_IDLE; + } + #endif + +@@ -1248,11 +1210,10 @@ minstrel_ht_tx_status(void *priv, struct + 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, *rate_sample = NULL; ++ struct minstrel_rate_stats *rate, *rate2; + struct minstrel_priv *mp = priv; + u32 update_interval = mp->update_interval; + bool last, update = false; +- bool sample_status = false; + int i; + + /* This packet was aggregated but doesn't carry status info */ +@@ -1279,49 +1240,18 @@ minstrel_ht_tx_status(void *priv, struct + mi->ampdu_packets++; + mi->ampdu_len += info->status.ampdu_len; + +- if (mi->sample_mode != MINSTREL_SAMPLE_IDLE) +- rate_sample = minstrel_get_ratestats(mi, mi->sample_rate); +- + 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 (rate == rate_sample) +- sample_status = true; +- + if (last) + rate->success += info->status.ampdu_ack_len; + + rate->attempts += ar[i].count * info->status.ampdu_len; + } + +- switch (mi->sample_mode) { +- case MINSTREL_SAMPLE_IDLE: +- if (mp->hw->max_rates > 1 || +- mi->total_packets_cur < SAMPLE_SWITCH_THR) +- update_interval /= 2; +- break; +- +- case MINSTREL_SAMPLE_ACTIVE: +- if (!sample_status) +- break; +- +- mi->sample_mode = MINSTREL_SAMPLE_PENDING; +- update = true; +- break; +- +- case MINSTREL_SAMPLE_PENDING: +- if (sample_status) +- break; +- +- update = true; +- minstrel_ht_update_stats(mp, mi, false); +- break; +- } +- +- + if (mp->hw->max_rates > 1) { + /* + * check for sudden death of spatial multiplexing, +@@ -1344,7 +1274,7 @@ minstrel_ht_tx_status(void *priv, struct + + if (time_after(jiffies, mi->last_stats_update + update_interval)) { + update = true; +- minstrel_ht_update_stats(mp, mi, true); ++ minstrel_ht_update_stats(mp, mi); + } + + if (update) +@@ -1523,18 +1453,14 @@ static void + minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) + { + struct ieee80211_sta_rates *rates; +- u16 first_rate = mi->max_tp_rate[0]; + int i = 0; + +- if (mi->sample_mode == MINSTREL_SAMPLE_ACTIVE) +- first_rate = mi->sample_rate; +- + rates = kzalloc(sizeof(*rates), GFP_ATOMIC); + if (!rates) + return; + + /* Start with max_tp_rate[0] */ +- minstrel_ht_set_rate(mp, mi, rates, i++, first_rate); ++ 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 */ +@@ -1593,11 +1519,6 @@ minstrel_ht_get_rate(void *priv, struct + (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO)) + return; + +- if (mp->hw->max_rates == 1 && mp->sample_switch && +- (mi->total_packets_cur >= SAMPLE_SWITCH_THR || +- mp->sample_switch == 1)) +- return; +- + if (time_is_before_jiffies(mi->sample_time)) + return; + +@@ -1811,7 +1732,7 @@ minstrel_ht_update_caps(void *priv, stru + minstrel_ht_update_ofdm(mp, mi, sband, sta); + + /* create an initial rate table with the lowest supported rates */ +- minstrel_ht_update_stats(mp, mi, true); ++ minstrel_ht_update_stats(mp, mi); + minstrel_ht_update_rates(mp, mi); + } + +@@ -1927,8 +1848,6 @@ minstrel_ht_alloc(struct ieee80211_hw *h + if (!mp) + return NULL; + +- mp->sample_switch = -1; +- + /* contention window settings + * Just an approximation. Using the per-queue values would complicate + * the calculations and is probably unnecessary */ +@@ -1948,7 +1867,7 @@ minstrel_ht_alloc(struct ieee80211_hw *h + mp->has_mrr = true; + + mp->hw = hw; +- mp->update_interval = HZ / 10; ++ mp->update_interval = HZ / 20; + + minstrel_ht_init_cck_rates(mp); + for (i = 0; i < ARRAY_SIZE(mp->hw->wiphy->bands); i++) +@@ -1966,8 +1885,6 @@ static void minstrel_ht_add_debugfs(stru + mp->fixed_rate_idx = (u32) -1; + debugfs_create_u32("fixed_rate_idx", S_IRUGO | S_IWUGO, debugfsdir, + &mp->fixed_rate_idx); +- debugfs_create_u32("sample_switch", S_IRUGO | S_IWUSR, debugfsdir, +- &mp->sample_switch); + } + #endif + +--- a/net/mac80211/rc80211_minstrel_ht.h ++++ b/net/mac80211/rc80211_minstrel_ht.h +@@ -75,7 +75,6 @@ + struct minstrel_priv { + struct ieee80211_hw *hw; + bool has_mrr; +- u32 sample_switch; + unsigned int cw_min; + unsigned int cw_max; + unsigned int max_retry; +@@ -147,12 +146,6 @@ struct minstrel_mcs_group_data { + struct minstrel_rate_stats rates[MCS_GROUP_RATES]; + }; + +-enum minstrel_sample_mode { +- MINSTREL_SAMPLE_IDLE, +- MINSTREL_SAMPLE_ACTIVE, +- MINSTREL_SAMPLE_PENDING, +-}; +- + struct minstrel_sample_category { + u8 sample_group; + u16 sample_rates[MINSTREL_SAMPLE_RATES]; +@@ -182,23 +175,19 @@ struct minstrel_ht_sta { + unsigned int overhead_legacy; + unsigned int overhead_legacy_rtscts; + +- unsigned int total_packets_last; +- unsigned int total_packets_cur; + unsigned int total_packets; + unsigned int sample_packets; + + /* tx flags to add for frames for this sta */ + u32 tx_flags; + +- unsigned long sample_time; +- struct minstrel_sample_category sample[__MINSTREL_SAMPLE_TYPE_MAX]; ++ u8 band; + + u8 sample_seq; +- +- enum minstrel_sample_mode sample_mode; + u16 sample_rate; + +- u8 band; ++ unsigned long sample_time; ++ struct minstrel_sample_category sample[__MINSTREL_SAMPLE_TYPE_MAX]; + + /* Bitfield of supported MCS rates of all groups */ + u16 supported[MINSTREL_GROUPS_NB]; |