--- /dev/null
+++ b/net/mac80211/rc80211_minstrel_ht.c
-@@ -0,0 +1,824 @@
+@@ -0,0 +1,800 @@
+/*
+ * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
+ *
+ } \
+}
+
-+#define MINSTREL_INTFL_SAMPLE_SLOT0 BIT(30)
-+#define MINSTREL_INTFL_SAMPLE_SLOT1 BIT(31)
-+
+/*
+ * To enable sufficiently targeted rate sampling, MCS rates are divided into
+ * groups, based on the number of streams and flags (HT40, SGI) that they
+static void
+minstrel_calc_rate_ewma(struct minstrel_priv *mp, struct minstrel_rate_stats *mr)
+{
-+ if (mr->attempts) {
++ if (unlikely(mr->attempts > 0)) {
++ mr->sample_skipped = 0;
+ mr->cur_prob = MINSTREL_FRAC(mr->success, mr->attempts);
+ if (!mr->att_hist)
+ mr->probability = mr->cur_prob;
+ mr->cur_prob, EWMA_LEVEL);
+ mr->att_hist += mr->attempts;
+ mr->succ_hist += mr->success;
++ } else {
++ mr->sample_skipped++;
+ }
+ mr->last_success = mr->success;
+ mr->last_attempts = mr->attempts;
+ int cur_prob, cur_prob_tp, cur_tp, cur_tp2;
+ int group, i, index;
+
++ mi->sample_count = 0;
+ mi->max_tp_rate = 0;
+ mi->max_tp_rate2 = 0;
+ mi->max_prob_rate = 0;
+ mg->max_tp_rate = 0;
+ mg->max_tp_rate2 = 0;
+ mg->max_prob_rate = 0;
++ mi->sample_count++;
+
+ for (i = 0; i < MCS_GROUP_RATES; i++) {
+ if (!(mg->supported & BIT(i)))
+ mr = minstrel_get_ratestats(mi, index);
+ }
+
-+ if (index == mg->max_tp_rate)
++ if (index >= mg->max_tp_rate)
+ continue;
+
+ if (mr->cur_tp > cur_tp2) {
+ }
+ }
+
++ /* try to sample up to half of the availble rates during each interval */
++ mi->sample_count *= 4;
++
+ cur_prob = 0;
+ cur_prob_tp = 0;
+ cur_tp = 0;
+}
+
+static void
-+minstrel_downgrade_rate(struct minstrel_ht_sta *mi, int *idx, int type)
++minstrel_downgrade_rate(struct minstrel_ht_sta *mi, int *idx, bool primary)
+{
+ int group, orig_group;
+
+ if (!mi->groups[group].supported)
+ continue;
+
-+ if (minstrel_mcs_groups[group].streams >=
++ if (minstrel_mcs_groups[group].streams >
+ minstrel_mcs_groups[orig_group].streams)
+ continue;
+
-+ switch(type) {
-+ case 0:
++ if (primary)
+ *idx = mi->groups[group].max_tp_rate;
-+ break;
-+ case 1:
++ else
+ *idx = mi->groups[group].max_tp_rate2;
-+ break;
-+ }
+ break;
+ }
+}
+ mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len,
+ MINSTREL_FRAC(info->status.ampdu_len, 1), 90);
+
++ if (!mi->sample_wait && !mi->sample_tries && mi->sample_count > 0) {
++ mi->sample_wait = 4 + MINSTREL_TRUNC(mi->avg_ampdu_len);
++ mi->sample_tries = 3;
++ mi->sample_count--;
++ }
++
++ if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) {
++ mi->sample_packets += info->status.ampdu_len;
++ minstrel_next_sample_idx(mi);
++ }
++
+ for (i = 0; !last; i++) {
+ last = (i == IEEE80211_TX_MAX_RATES - 1) ||
+ !minstrel_ht_txstat_valid(&ar[i + 1]);
+ if (!minstrel_ht_txstat_valid(&ar[i]))
+ break;
+
-+ if ((i == 0 && (info->flags & MINSTREL_INTFL_SAMPLE_SLOT0)) ||
-+ (i == 1 && (info->flags & MINSTREL_INTFL_SAMPLE_SLOT1))) {
-+ if (mi->sample_pending > 0)
-+ mi->sample_pending--;
-+ mi->sample_packets++;
-+ minstrel_next_sample_idx(mi);
-+ }
-+
+ group = minstrel_ht_get_group_idx(&ar[i]);
+ rate = &mi->groups[group].rates[ar[i].idx % 8];
+
+ rate->attempts += ar[i].count * info->status.ampdu_len;
+ }
+
-+
+ /*
+ * 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);
+ if (MINSTREL_FRAC(rate->success, rate->attempts) <
-+ MINSTREL_FRAC(20, 100) && rate->attempts > 15)
-+ minstrel_downgrade_rate(mi, &mi->max_tp_rate, 0);
++ MINSTREL_FRAC(20, 100) && rate->attempts > 30)
++ minstrel_downgrade_rate(mi, &mi->max_tp_rate, true);
+
+ rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate2);
+ if (MINSTREL_FRAC(rate->success, rate->attempts) <
-+ MINSTREL_FRAC(20, 100) && rate->attempts > 15)
-+ minstrel_downgrade_rate(mi, &mi->max_tp_rate2, 1);
++ MINSTREL_FRAC(20, 100) && rate->attempts > 30)
++ minstrel_downgrade_rate(mi, &mi->max_tp_rate2, false);
+
+ if (time_after(jiffies, mi->stats_update + (mp->update_interval / 2 * HZ) / 1000))
+ minstrel_ht_update_stats(mp, mi);
+}
+
+static int
-+minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
-+ bool *defer)
++minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
+{
+ struct minstrel_rate_stats *mr;
+ struct minstrel_mcs_group_data *mg;
+ int sample_idx = 0;
-+ int sample_rate;
-+ int delta;
-+
-+ if (mp->has_mrr)
-+ sample_rate = mp->lookaround_rate_mrr;
-+ else
-+ sample_rate = mp->lookaround_rate;
-+
-+ delta = (mi->total_packets * sample_rate) / 100 - mi->sample_packets;
-+ delta -= mi->sample_pending / 2;
+
-+ if (delta <= 0)
++ if (mi->sample_wait > 0) {
++ mi->sample_wait--;
+ return -1;
-+
-+ delta -= 16;
-+ if (delta > 1) {
-+ /* With multi-rate retry, not every planned sample
-+ * attempt actually gets used, due to the way the retry
-+ * chain is set up - [max_tp,sample,prob,lowest] for
-+ * sample_rate < max_tp.
-+ *
-+ * If there's too much sampling backlog and the link
-+ * starts getting worse, minstrel would start bursting
-+ * out lots of sampling frames, which would result
-+ * in a large throughput loss.
-+ */
-+ mi->sample_packets += delta - 1;
+ }
+
++ if (!mi->sample_tries)
++ return -1;
++
++ mi->sample_tries--;
+ mg = &mi->groups[mi->sample_group];
+ sample_idx = sample_table[mg->column][mg->index];
+ mr = &mg->rates[sample_idx];
+ * higher than 95% to avoid wasting airtime
+ */
+ if (!mp->has_mrr && (mr->probability > MINSTREL_FRAC(95, 100)))
-+ return -1;
++ goto next;
+
++ /*
++ * Make sure that lower rates get sampled only occasionally,
++ * if the link is working perfectly.
++ */
+ if (minstrel_get_duration(sample_idx) >
-+ minstrel_get_duration(mi->max_tp_rate)) {
-+ /*
-+ * Make sure that lower rates get sampled occasionally, even
-+ * if the link is working perfectly. Some drivers such as ath9k
-+ * severely limit aggregation size if the MRR chain contains low
-+ * rates
-+ *
-+ * If the lower rate has already been tried a few times, there's
-+ * no point in forcing it to be sampled again, so skip to the
-+ * next sampling index after applying this one in the tx control
-+ */
-+ if (mr->att_hist > 15) {
-+ *defer = true;
-+ minstrel_next_sample_idx(mi);
-+ }
-+ }
++ minstrel_get_duration(mi->max_tp_rate) &&
++ mr->sample_skipped < 10)
++ goto next;
+
+ return sample_idx;
++
++next:
++ minstrel_next_sample_idx(mi);
++ return -1;
+}
+
+static void
+ struct minstrel_ht_sta_priv *msp = priv_sta;
+ struct minstrel_ht_sta *mi = &msp->ht;
+ struct minstrel_priv *mp = priv;
-+ bool sample_defer = false;
+ int sample_idx;
+
+ if (rate_control_send_low(sta, priv_sta, txrc))
+
+ minstrel_aggr_check(mp, sta, txrc->skb);
+
-+ sample_idx = minstrel_get_sample_rate(mp, mi, &sample_defer);
++ sample_idx = minstrel_get_sample_rate(mp, mi);
+ if (sample_idx >= 0) {
-+ if (sample_defer) {
-+ minstrel_ht_set_rate(mp, mi, &ar[0], mi->max_tp_rate,
-+ txrc, false, false);
-+ minstrel_ht_set_rate(mp, mi, &ar[1], sample_idx,
-+ txrc, true, true);
-+ info->flags |= MINSTREL_INTFL_SAMPLE_SLOT1;
-+ } else {
-+ minstrel_ht_set_rate(mp, mi, &ar[0], sample_idx,
-+ txrc, true, false);
-+ minstrel_ht_set_rate(mp, mi, &ar[1], mi->max_tp_rate,
-+ txrc, false, true);
-+ info->flags |= MINSTREL_INTFL_SAMPLE_SLOT0;
-+ }
-+ mi->sample_pending++;
++ minstrel_ht_set_rate(mp, mi, &ar[0], sample_idx,
++ txrc, true, false);
++ minstrel_ht_set_rate(mp, mi, &ar[1], mi->max_tp_rate,
++ txrc, false, true);
++ info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
+ } else {
+ minstrel_ht_set_rate(mp, mi, &ar[0], mi->max_tp_rate,
+ txrc, false, false);
+ mi->total_packets++;
+
+ /* wraparound */
-+ if (mi->total_packets >= 100000) {
++ if (mi->total_packets == ~0) {
+ mi->total_packets = 0;
+ mi->sample_packets = 0;
-+ mi->sample_pending = 0;
+ }
+}
+
+static void
-+minstrel_ht_update_cap(struct minstrel_ht_sta *mi, struct ieee80211_sta *sta,
-+ enum nl80211_channel_type oper_chan_type)
++minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband,
++ struct ieee80211_sta *sta, void *priv_sta,
++ enum nl80211_channel_type oper_chan_type)
+{
++ struct minstrel_priv *mp = priv;
++ struct minstrel_ht_sta_priv *msp = priv_sta;
++ struct minstrel_ht_sta *mi = &msp->ht;
+ struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs;
++ struct ieee80211_local *local = hw_to_local(mp->hw);
+ u16 sta_cap = sta->ht_cap.cap;
++ int ack_dur;
+ int i;
+
++ /* fall back to the old minstrel for legacy stations */
++ if (sta && !sta->ht_cap.ht_supported) {
++ msp->is_ht = false;
++ memset(&msp->legacy, 0, sizeof(msp->legacy));
++ msp->legacy.r = msp->ratelist;
++ msp->legacy.sample_table = msp->sample_table;
++ return mac80211_minstrel.rate_init(priv, sband, sta, &msp->legacy);
++ }
++
++ BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) !=
++ MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS);
++
++ msp->is_ht = true;
++ memset(mi, 0, sizeof(*mi));
++ mi->stats_update = jiffies;
++
++ ack_dur = ieee80211_frame_duration(local, 10, 60, 1, 1);
++ mi->overhead = ieee80211_frame_duration(local, 0, 60, 1, 1) + ack_dur;
++ mi->overhead_rtscts = mi->overhead + 2 * ack_dur;
++
++ mi->avg_ampdu_len = MINSTREL_FRAC(1, 1);
++
++ /* When using MRR, sample more on the first attempt, without delay */
++ if (mp->has_mrr) {
++ mi->sample_count = 16;
++ mi->sample_wait = 0;
++ } else {
++ mi->sample_count = 8;
++ mi->sample_wait = 8;
++ }
++ mi->sample_tries = 4;
++
+ if (oper_chan_type != NL80211_CHAN_HT40MINUS &&
+ oper_chan_type != NL80211_CHAN_HT40PLUS)
+ sta_cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
+ struct ieee80211_sta *sta, void *priv_sta)
+{
+ struct minstrel_priv *mp = priv;
-+ struct minstrel_ht_sta_priv *msp = priv_sta;
-+ struct minstrel_ht_sta *mi = &msp->ht;
-+ struct ieee80211_local *local = hw_to_local(mp->hw);
-+ int ack_dur;
-+
-+ /* fall back to the old minstrel for legacy stations */
-+ if (sta && !sta->ht_cap.ht_supported) {
-+ msp->is_ht = false;
-+ memset(&msp->legacy, 0, sizeof(msp->legacy));
-+ msp->legacy.r = msp->ratelist;
-+ msp->legacy.sample_table = msp->sample_table;
-+ return mac80211_minstrel.rate_init(priv, sband, sta, &msp->legacy);
-+ }
-+
-+ BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) !=
-+ MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS);
-+
-+ msp->is_ht = true;
-+ memset(mi, 0, sizeof(*mi));
-+ mi->stats_update = jiffies;
+
-+ ack_dur = ieee80211_frame_duration(local, 10, 60, 1, 1);
-+ mi->overhead = ieee80211_frame_duration(local, 0, 60, 1, 1) + ack_dur;
-+ mi->overhead_rtscts = mi->overhead + 2 * ack_dur;
-+
-+ mi->avg_ampdu_len = MINSTREL_FRAC(1, 1);
-+
-+ minstrel_ht_update_cap(mi, sta, mp->hw->conf.channel_type);
++ minstrel_ht_update_caps(priv, sband, sta, priv_sta, mp->hw->conf.channel_type);
+}
+
+static void
+ struct ieee80211_sta *sta, void *priv_sta,
+ u32 changed, enum nl80211_channel_type oper_chan_type)
+{
-+ struct minstrel_ht_sta_priv *msp = priv_sta;
-+ struct minstrel_ht_sta *mi = &msp->ht;
-+
-+ minstrel_ht_update_cap(mi, sta, oper_chan_type);
++ minstrel_ht_update_caps(priv, sband, sta, priv_sta, oper_chan_type);
+}
+
+static void *
+}
--- /dev/null
+++ b/net/mac80211/rc80211_minstrel_ht.h
-@@ -0,0 +1,115 @@
+@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
+ *
+ unsigned int cur_prob, probability;
+
+ /* maximum retry counts */
-+ bool retry_updated;
+ unsigned int retry_count;
+ unsigned int retry_count_rtscts;
++
++ bool retry_updated;
++ u8 sample_skipped;
+};
+
+struct minstrel_mcs_group_data {
+
+ unsigned int total_packets;
+ unsigned int sample_packets;
-+ unsigned int sample_pending;
++
++ u8 sample_wait;
++ u8 sample_tries;
++ u8 sample_count;
+
+ /* current MCS group to be sampled */
-+ unsigned int sample_group;
++ u8 sample_group;
+
+ /* MCS rate group info and statistics */
+ struct minstrel_mcs_group_data groups[MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS];
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