diff options
Diffstat (limited to 'package/mac80211/patches/530-minstrel_ht.patch')
| -rw-r--r-- | package/mac80211/patches/530-minstrel_ht.patch | 1147 |
1 files changed, 0 insertions, 1147 deletions
diff --git a/package/mac80211/patches/530-minstrel_ht.patch b/package/mac80211/patches/530-minstrel_ht.patch deleted file mode 100644 index 046e91b8c..000000000 --- a/package/mac80211/patches/530-minstrel_ht.patch +++ /dev/null @@ -1,1147 +0,0 @@ ---- a/net/mac80211/Makefile -+++ b/net/mac80211/Makefile -@@ -47,8 +47,8 @@ CFLAGS_driver-trace.o := -I$(src) - rc80211_pid-y := rc80211_pid_algo.o - rc80211_pid-$(CONFIG_MAC80211_DEBUGFS) += rc80211_pid_debugfs.o - --rc80211_minstrel-y := rc80211_minstrel.o --rc80211_minstrel-$(CONFIG_MAC80211_DEBUGFS) += rc80211_minstrel_debugfs.o -+rc80211_minstrel-y := rc80211_minstrel.o rc80211_minstrel_ht.o -+rc80211_minstrel-$(CONFIG_MAC80211_DEBUGFS) += rc80211_minstrel_debugfs.o rc80211_minstrel_ht_debugfs.o - - mac80211-$(CONFIG_MAC80211_RC_PID) += $(rc80211_pid-y) - mac80211-$(CONFIG_MAC80211_RC_MINSTREL) += $(rc80211_minstrel-y) ---- a/net/mac80211/main.c -+++ b/net/mac80211/main.c -@@ -716,6 +716,10 @@ static int __init ieee80211_init(void) - if (ret) - return ret; - -+ ret = rc80211_minstrel_ht_init(); -+ if (ret) -+ goto err_minstrel; -+ - ret = rc80211_pid_init(); - if (ret) - goto err_pid; -@@ -728,6 +732,8 @@ static int __init ieee80211_init(void) - err_netdev: - rc80211_pid_exit(); - err_pid: -+ rc80211_minstrel_ht_exit(); -+ err_minstrel: - rc80211_minstrel_exit(); - - return ret; -@@ -736,6 +742,7 @@ static int __init ieee80211_init(void) - static void __exit ieee80211_exit(void) - { - rc80211_pid_exit(); -+ rc80211_minstrel_ht_exit(); - rc80211_minstrel_exit(); - - /* ---- a/net/mac80211/rate.h -+++ b/net/mac80211/rate.h -@@ -137,6 +137,8 @@ static inline void rc80211_pid_exit(void - #ifdef CONFIG_MAC80211_RC_MINSTREL - extern int rc80211_minstrel_init(void); - extern void rc80211_minstrel_exit(void); -+extern int rc80211_minstrel_ht_init(void); -+extern void rc80211_minstrel_ht_exit(void); - #else - static inline int rc80211_minstrel_init(void) - { -@@ -145,6 +147,13 @@ static inline int rc80211_minstrel_init( - static inline void rc80211_minstrel_exit(void) - { - } -+static inline int rc80211_minstrel_ht_init(void) -+{ -+ return 0; -+} -+static inline void rc80211_minstrel_ht_exit(void) -+{ -+} - #endif - - ---- /dev/null -+++ b/net/mac80211/rc80211_minstrel_ht.c -@@ -0,0 +1,822 @@ -+/* -+ * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org> -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 as -+ * published by the Free Software Foundation. -+ */ -+#include <linux/netdevice.h> -+#include <linux/types.h> -+#include <linux/skbuff.h> -+#include <linux/debugfs.h> -+#include <linux/random.h> -+#include <linux/ieee80211.h> -+#include <net/mac80211.h> -+#include "rate.h" -+#include "rc80211_minstrel.h" -+#include "rc80211_minstrel_ht.h" -+ -+#define AVG_PKT_SIZE 1200 -+#define SAMPLE_COLUMNS 10 -+#define EWMA_LEVEL 75 -+ -+/* Number of bits for an average sized packet */ -+#define MCS_NBITS (AVG_PKT_SIZE << 3) -+ -+/* Number of symbols for a packet with (bps) bits per symbol */ -+#define MCS_NSYMS(bps) ((MCS_NBITS + (bps) - 1) / (bps)) -+ -+/* Transmission time for a packet containing (syms) symbols */ -+#define MCS_SYMBOL_TIME(sgi, syms) \ -+ (sgi ? \ -+ ((syms) * 18 + 4) / 5 : /* syms * 3.6 us */ \ -+ (syms) << 2 /* syms * 4 us */ \ -+ ) -+ -+/* Transmit duration for the raw data part of an average sized packet */ -+#define MCS_DURATION(streams, sgi, bps) MCS_SYMBOL_TIME(sgi, MCS_NSYMS((streams) * (bps))) -+ -+/* MCS rate information for an MCS group */ -+#define MCS_GROUP(_streams, _sgi, _ht40) { \ -+ .streams = _streams, \ -+ .flags = \ -+ (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \ -+ (_ht40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \ -+ .duration = { \ -+ MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26), \ -+ MCS_DURATION(_streams, _sgi, _ht40 ? 108 : 52), \ -+ MCS_DURATION(_streams, _sgi, _ht40 ? 162 : 78), \ -+ MCS_DURATION(_streams, _sgi, _ht40 ? 216 : 104), \ -+ MCS_DURATION(_streams, _sgi, _ht40 ? 324 : 156), \ -+ MCS_DURATION(_streams, _sgi, _ht40 ? 432 : 208), \ -+ MCS_DURATION(_streams, _sgi, _ht40 ? 486 : 234), \ -+ MCS_DURATION(_streams, _sgi, _ht40 ? 540 : 260) \ -+ } \ -+} -+ -+/* -+ * To enable sufficiently targeted rate sampling, MCS rates are divided into -+ * groups, based on the number of streams and flags (HT40, SGI) that they -+ * use. -+ */ -+const struct mcs_group minstrel_mcs_groups[] = { -+ MCS_GROUP(1, 0, 0), -+ MCS_GROUP(2, 0, 0), -+#if MINSTREL_MAX_STREAMS >= 3 -+ MCS_GROUP(3, 0, 0), -+#endif -+ -+ MCS_GROUP(1, 1, 0), -+ MCS_GROUP(2, 1, 0), -+#if MINSTREL_MAX_STREAMS >= 3 -+ MCS_GROUP(3, 1, 0), -+#endif -+ -+ MCS_GROUP(1, 0, 1), -+ MCS_GROUP(2, 0, 1), -+#if MINSTREL_MAX_STREAMS >= 3 -+ MCS_GROUP(3, 0, 1), -+#endif -+ -+ MCS_GROUP(1, 1, 1), -+ MCS_GROUP(2, 1, 1), -+#if MINSTREL_MAX_STREAMS >= 3 -+ MCS_GROUP(3, 1, 1), -+#endif -+}; -+ -+static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES]; -+ -+/* -+ * Perform EWMA (Exponentially Weighted Moving Average) calculation -+ */ -+static int -+minstrel_ewma(int old, int new, int weight) -+{ -+ return (new * (100 - weight) + old * weight) / 100; -+} -+ -+/* -+ * Look up an MCS group index based on mac80211 rate information -+ */ -+static int -+minstrel_ht_get_group_idx(struct ieee80211_tx_rate *rate) -+{ -+ int streams = (rate->idx / MCS_GROUP_RATES) + 1; -+ u32 flags = IEEE80211_TX_RC_SHORT_GI | IEEE80211_TX_RC_40_MHZ_WIDTH; -+ int i; -+ -+ for (i = 0; i < ARRAY_SIZE(minstrel_mcs_groups); i++) { -+ if (minstrel_mcs_groups[i].streams != streams) -+ continue; -+ if (minstrel_mcs_groups[i].flags != (rate->flags & flags)) -+ continue; -+ -+ return i; -+ } -+ -+ WARN_ON(1); -+ return 0; -+} -+ -+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]; -+} -+ -+ -+/* -+ * Recalculate success probabilities and counters for a rate using EWMA -+ */ -+static void -+minstrel_calc_rate_ewma(struct minstrel_priv *mp, struct minstrel_rate_stats *mr) -+{ -+ 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; -+ else -+ mr->probability = minstrel_ewma(mr->probability, -+ 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; -+ mr->success = 0; -+ mr->attempts = 0; -+} -+ -+/* -+ * Calculate throughput based on the average A-MPDU length, taking into account -+ * the expected number of retransmissions and their expected length -+ */ -+static void -+minstrel_ht_calc_tp(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, -+ int group, int rate) -+{ -+ struct minstrel_rate_stats *mr; -+ unsigned int usecs; -+ -+ mr = &mi->groups[group].rates[rate]; -+ -+ if (mr->probability < MINSTREL_FRAC(1, 10)) { -+ mr->cur_tp = 0; -+ return; -+ } -+ -+ usecs = mi->overhead / MINSTREL_TRUNC(mi->avg_ampdu_len); -+ usecs += minstrel_mcs_groups[group].duration[rate]; -+ mr->cur_tp = MINSTREL_TRUNC((1000000 / usecs) * mr->probability); -+} -+ -+/* -+ * Update rate statistics and select new primary rates -+ * -+ * Rules for rate selection: -+ * - max_prob_rate must use only one stream, as a tradeoff between delivery -+ * probability and throughput during strong fluctuations -+ * - as long as the max prob rate has a probability of more than 3/4, pick -+ * 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) -+{ -+ struct minstrel_mcs_group_data *mg; -+ struct minstrel_rate_stats *mr; -+ int cur_prob, cur_prob_tp, cur_tp, cur_tp2; -+ int group, i, index; -+ -+ if (mi->ampdu_packets > 0) { -+ mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len, -+ MINSTREL_FRAC(mi->ampdu_len, mi->ampdu_packets), EWMA_LEVEL); -+ mi->ampdu_len = 0; -+ mi->ampdu_packets = 0; -+ } -+ -+ mi->sample_slow = 0; -+ mi->sample_count = 0; -+ mi->max_tp_rate = 0; -+ mi->max_tp_rate2 = 0; -+ mi->max_prob_rate = 0; -+ -+ for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { -+ cur_prob = 0; -+ cur_prob_tp = 0; -+ cur_tp = 0; -+ cur_tp2 = 0; -+ -+ mg = &mi->groups[group]; -+ if (!mg->supported) -+ continue; -+ -+ 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))) -+ continue; -+ -+ mr = &mg->rates[i]; -+ mr->retry_updated = false; -+ index = MCS_GROUP_RATES * group + i; -+ minstrel_calc_rate_ewma(mp, mr); -+ minstrel_ht_calc_tp(mp, mi, group, i); -+ -+ if (!mr->cur_tp) -+ continue; -+ -+ /* ignore the lowest rate of each single-stream group */ -+ if (!i && minstrel_mcs_groups[group].streams == 1) -+ continue; -+ -+ if ((mr->cur_tp > cur_prob_tp && mr->probability > -+ MINSTREL_FRAC(3, 4)) || mr->probability > cur_prob) { -+ mg->max_prob_rate = index; -+ cur_prob = mr->probability; -+ } -+ -+ if (mr->cur_tp > cur_tp) { -+ swap(index, mg->max_tp_rate); -+ cur_tp = mr->cur_tp; -+ mr = minstrel_get_ratestats(mi, index); -+ } -+ -+ if (index >= mg->max_tp_rate) -+ continue; -+ -+ if (mr->cur_tp > cur_tp2) { -+ mg->max_tp_rate2 = index; -+ cur_tp2 = mr->cur_tp; -+ } -+ } -+ } -+ -+ /* 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; -+ cur_tp2 = 0; -+ for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { -+ mg = &mi->groups[group]; -+ if (!mg->supported) -+ continue; -+ -+ mr = minstrel_get_ratestats(mi, mg->max_prob_rate); -+ if (cur_prob_tp < mr->cur_tp && -+ minstrel_mcs_groups[group].streams == 1) { -+ mi->max_prob_rate = mg->max_prob_rate; -+ cur_prob = mr->cur_prob; -+ } -+ -+ mr = minstrel_get_ratestats(mi, mg->max_tp_rate); -+ if (cur_tp < mr->cur_tp) { -+ mi->max_tp_rate = mg->max_tp_rate; -+ cur_tp = mr->cur_tp; -+ } -+ -+ mr = minstrel_get_ratestats(mi, mg->max_tp_rate2); -+ if (cur_tp2 < mr->cur_tp) { -+ mi->max_tp_rate2 = mg->max_tp_rate2; -+ cur_tp2 = mr->cur_tp; -+ } -+ } -+ -+ mi->stats_update = jiffies; -+} -+ -+static bool -+minstrel_ht_txstat_valid(struct ieee80211_tx_rate *rate) -+{ -+ if (!rate->count) -+ return false; -+ -+ if (rate->idx < 0) -+ return false; -+ -+ return !!(rate->flags & IEEE80211_TX_RC_MCS); -+} -+ -+static void -+minstrel_next_sample_idx(struct minstrel_ht_sta *mi) -+{ -+ struct minstrel_mcs_group_data *mg; -+ -+ for (;;) { -+ mi->sample_group++; -+ mi->sample_group %= ARRAY_SIZE(minstrel_mcs_groups); -+ mg = &mi->groups[mi->sample_group]; -+ -+ if (!mg->supported) -+ continue; -+ -+ if (++mg->index >= MCS_GROUP_RATES) { -+ mg->index = 0; -+ if (++mg->column >= ARRAY_SIZE(sample_table)) -+ mg->column = 0; -+ } -+ break; -+ } -+} -+ -+static void -+minstrel_downgrade_rate(struct minstrel_ht_sta *mi, int *idx, bool primary) -+{ -+ int group, orig_group; -+ -+ orig_group = group = *idx / MCS_GROUP_RATES; -+ while (group > 0) { -+ group--; -+ -+ if (!mi->groups[group].supported) -+ continue; -+ -+ if (minstrel_mcs_groups[group].streams > -+ minstrel_mcs_groups[orig_group].streams) -+ continue; -+ -+ if (primary) -+ *idx = mi->groups[group].max_tp_rate; -+ else -+ *idx = mi->groups[group].max_tp_rate2; -+ break; -+ } -+} -+ -+static void -+minstrel_aggr_check(struct minstrel_priv *mp, struct ieee80211_sta *pubsta, struct sk_buff *skb) -+{ -+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; -+ struct sta_info *sta = container_of(pubsta, struct sta_info, sta); -+ u16 tid; -+ -+ if (unlikely(!ieee80211_is_data_qos(hdr->frame_control))) -+ return; -+ -+ if (unlikely(skb->protocol == cpu_to_be16(ETH_P_PAE))) -+ return; -+ -+ tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; -+ if (likely(sta->ampdu_mlme.tid_state_tx[tid] != HT_AGG_STATE_IDLE)) -+ return; -+ -+ ieee80211_start_tx_ba_session(pubsta, tid); -+} -+ -+static void -+minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband, -+ struct ieee80211_sta *sta, void *priv_sta, -+ struct sk_buff *skb) -+{ -+ struct minstrel_ht_sta_priv *msp = priv_sta; -+ struct minstrel_ht_sta *mi = &msp->ht; -+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); -+ struct ieee80211_tx_rate *ar = info->status.rates; -+ struct minstrel_rate_stats *rate, *rate2; -+ struct minstrel_priv *mp = priv; -+ bool last = false; -+ int group; -+ int i = 0; -+ -+ if (!msp->is_ht) -+ return mac80211_minstrel.tx_status(priv, sband, sta, &msp->legacy, skb); -+ -+ /* This packet was aggregated but doesn't carry status info */ -+ if ((info->flags & IEEE80211_TX_CTL_AMPDU) && -+ !(info->flags & IEEE80211_TX_STAT_AMPDU)) -+ return; -+ -+ if (!info->status.ampdu_len) { -+ info->status.ampdu_ack_len = 1; -+ info->status.ampdu_len = 1; -+ } -+ -+ mi->ampdu_packets++; -+ mi->ampdu_len += info->status.ampdu_len; -+ -+ if (!mi->sample_wait && !mi->sample_tries && mi->sample_count > 0) { -+ mi->sample_wait = 4 + 2 * 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; -+ -+ group = minstrel_ht_get_group_idx(&ar[i]); -+ rate = &mi->groups[group].rates[ar[i].idx % 8]; -+ -+ if (last && (info->flags & IEEE80211_TX_STAT_ACK)) -+ rate->success += info->status.ampdu_ack_len; -+ -+ 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 (rate->attempts > 30 && -+ MINSTREL_FRAC(rate->success, rate->attempts) < -+ MINSTREL_FRAC(20, 100)) -+ minstrel_downgrade_rate(mi, &mi->max_tp_rate, true); -+ -+ rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate2); -+ if (rate->attempts > 30 && -+ MINSTREL_FRAC(rate->success, rate->attempts) < -+ MINSTREL_FRAC(20, 100)) -+ 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); -+ minstrel_aggr_check(mp, sta, skb); -+ } -+} -+ -+static void -+minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, -+ int index) -+{ -+ struct minstrel_rate_stats *mr; -+ const struct mcs_group *group; -+ unsigned int tx_time, tx_time_rtscts, tx_time_data; -+ unsigned int cw = mp->cw_min; -+ unsigned int t_slot = 9; /* FIXME */ -+ unsigned int ampdu_len = MINSTREL_TRUNC(mi->avg_ampdu_len); -+ -+ mr = minstrel_get_ratestats(mi, index); -+ if (mr->probability < MINSTREL_FRAC(1, 10)) { -+ mr->retry_count = 1; -+ mr->retry_count_rtscts = 1; -+ return; -+ } -+ -+ mr->retry_count = 2; -+ mr->retry_count_rtscts = 2; -+ mr->retry_updated = true; -+ -+ group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; -+ tx_time_data = group->duration[index % MCS_GROUP_RATES] * ampdu_len; -+ tx_time = 2 * (t_slot + mi->overhead + tx_time_data); -+ tx_time_rtscts = 2 * (t_slot + mi->overhead_rtscts + tx_time_data); -+ do { -+ cw = (cw << 1) | 1; -+ cw = min(cw, mp->cw_max); -+ tx_time += cw + t_slot + mi->overhead; -+ tx_time_rtscts += cw + t_slot + mi->overhead_rtscts; -+ if (tx_time_rtscts < mp->segment_size) -+ mr->retry_count_rtscts++; -+ } while ((tx_time < mp->segment_size) && -+ (++mr->retry_count < mp->max_retry)); -+} -+ -+ -+static void -+minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, -+ struct ieee80211_tx_rate *rate, int index, -+ struct ieee80211_tx_rate_control *txrc, -+ bool sample, bool rtscts) -+{ -+ const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; -+ struct minstrel_rate_stats *mr; -+ -+ mr = minstrel_get_ratestats(mi, index); -+ if (!mr->retry_updated) -+ minstrel_calc_retransmit(mp, mi, index); -+ -+ if (mr->probability < MINSTREL_FRAC(20, 100)) -+ rate->count = 2; -+ else if (rtscts) -+ rate->count = mr->retry_count_rtscts; -+ else -+ rate->count = mr->retry_count; -+ -+ rate->flags = IEEE80211_TX_RC_MCS | group->flags; -+ if (txrc->short_preamble) -+ rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE; -+ if (txrc->rts || rtscts) -+ rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS; -+ rate->idx = index % MCS_GROUP_RATES + (group->streams - 1) * MCS_GROUP_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) -+{ -+ struct minstrel_rate_stats *mr; -+ struct minstrel_mcs_group_data *mg; -+ int sample_idx = 0; -+ -+ if (mi->sample_wait > 0) { -+ mi->sample_wait--; -+ return -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]; -+ sample_idx += mi->sample_group * MCS_GROUP_RATES; -+ -+ /* -+ * When not using MRR, do not sample if the probability is already -+ * higher than 95% to avoid wasting airtime -+ */ -+ if (!mp->has_mrr && (mr->probability > MINSTREL_FRAC(95, 100))) -+ 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)) { -+ if (mr->sample_skipped < 10) -+ goto next; -+ -+ if (mi->sample_slow++ > 2) -+ goto next; -+ } -+ -+ return sample_idx; -+ -+next: -+ minstrel_next_sample_idx(mi); -+ return -1; -+} -+ -+static void -+minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta, -+ struct ieee80211_tx_rate_control *txrc) -+{ -+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); -+ struct ieee80211_tx_rate *ar = info->status.rates; -+ struct minstrel_ht_sta_priv *msp = priv_sta; -+ struct minstrel_ht_sta *mi = &msp->ht; -+ struct minstrel_priv *mp = priv; -+ int sample_idx; -+ -+ if (rate_control_send_low(sta, priv_sta, txrc)) -+ return; -+ -+ if (!msp->is_ht) -+ return mac80211_minstrel.get_rate(priv, sta, &msp->legacy, txrc); -+ -+ info->flags |= mi->tx_flags; -+ sample_idx = minstrel_get_sample_rate(mp, mi); -+ if (sample_idx >= 0) { -+ 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); -+ minstrel_ht_set_rate(mp, mi, &ar[1], mi->max_tp_rate2, -+ txrc, false, true); -+ } -+ minstrel_ht_set_rate(mp, mi, &ar[2], mi->max_prob_rate, txrc, false, true); -+ -+ ar[3].count = 0; -+ ar[3].idx = -1; -+ -+ mi->total_packets++; -+ -+ /* wraparound */ -+ if (mi->total_packets == ~0) { -+ mi->total_packets = 0; -+ mi->sample_packets = 0; -+ } -+} -+ -+static void -+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 (sta_cap & IEEE80211_HT_CAP_TX_STBC) -+ mi->tx_flags |= IEEE80211_TX_CTL_STBC; -+ -+ if (sta_cap & IEEE80211_HT_CAP_LDPC_CODING) -+ mi->tx_flags |= IEEE80211_TX_CTL_LDPC; -+ -+ if (oper_chan_type != NL80211_CHAN_HT40MINUS && -+ oper_chan_type != NL80211_CHAN_HT40PLUS) -+ sta_cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; -+ -+ for (i = 0; i < ARRAY_SIZE(mi->groups); i++) { -+ u16 req = 0; -+ -+ mi->groups[i].supported = 0; -+ if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_SHORT_GI) { -+ if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) -+ req |= IEEE80211_HT_CAP_SGI_40; -+ else -+ req |= IEEE80211_HT_CAP_SGI_20; -+ } -+ -+ if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) -+ req |= IEEE80211_HT_CAP_SUP_WIDTH_20_40; -+ -+ if ((sta_cap & req) != req) -+ continue; -+ -+ mi->groups[i].supported = -+ mcs->rx_mask[minstrel_mcs_groups[i].streams - 1]; -+ } -+} -+ -+static void -+minstrel_ht_rate_init(void *priv, struct ieee80211_supported_band *sband, -+ struct ieee80211_sta *sta, void *priv_sta) -+{ -+ struct minstrel_priv *mp = priv; -+ -+ minstrel_ht_update_caps(priv, sband, sta, priv_sta, mp->hw->conf.channel_type); -+} -+ -+static void -+minstrel_ht_rate_update(void *priv, struct ieee80211_supported_band *sband, -+ struct ieee80211_sta *sta, void *priv_sta, -+ u32 changed, enum nl80211_channel_type oper_chan_type) -+{ -+ minstrel_ht_update_caps(priv, sband, sta, priv_sta, oper_chan_type); -+} -+ -+static void * -+minstrel_ht_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp) -+{ -+ struct ieee80211_supported_band *sband; -+ struct minstrel_ht_sta_priv *msp; -+ struct minstrel_priv *mp = priv; -+ struct ieee80211_hw *hw = mp->hw; -+ int max_rates = 0; -+ int i; -+ -+ for (i = 0; i < IEEE80211_NUM_BANDS; i++) { -+ sband = hw->wiphy->bands[i]; -+ if (sband && sband->n_bitrates > max_rates) -+ max_rates = sband->n_bitrates; -+ } -+ -+ msp = kzalloc(sizeof(struct minstrel_ht_sta), gfp); -+ if (!msp) -+ return NULL; -+ -+ msp->ratelist = kzalloc(sizeof(struct minstrel_rate) * max_rates, gfp); -+ if (!msp->ratelist) -+ goto error; -+ -+ msp->sample_table = kmalloc(SAMPLE_COLUMNS * max_rates, gfp); -+ if (!msp->sample_table) -+ goto error1; -+ -+ return msp; -+ -+error1: -+ kfree(msp->sample_table); -+error: -+ kfree(msp); -+ return NULL; -+} -+ -+static void -+minstrel_ht_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta) -+{ -+ struct minstrel_ht_sta_priv *msp = priv_sta; -+ -+ kfree(msp->sample_table); -+ kfree(msp->ratelist); -+ kfree(msp); -+} -+ -+static void * -+minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) -+{ -+ return mac80211_minstrel.alloc(hw, debugfsdir); -+} -+ -+static void -+minstrel_ht_free(void *priv) -+{ -+ mac80211_minstrel.free(priv); -+} -+ -+static struct rate_control_ops mac80211_minstrel_ht = { -+ .name = "minstrel_ht", -+ .tx_status = minstrel_ht_tx_status, -+ .get_rate = minstrel_ht_get_rate, -+ .rate_init = minstrel_ht_rate_init, -+ .rate_update = minstrel_ht_rate_update, -+ .alloc_sta = minstrel_ht_alloc_sta, -+ .free_sta = minstrel_ht_free_sta, -+ .alloc = minstrel_ht_alloc, -+ .free = minstrel_ht_free, -+#ifdef CONFIG_MAC80211_DEBUGFS -+ .add_sta_debugfs = minstrel_ht_add_sta_debugfs, -+ .remove_sta_debugfs = minstrel_ht_remove_sta_debugfs, -+#endif -+}; -+ -+ -+static void -+init_sample_table(void) -+{ -+ int col, i, new_idx; -+ u8 rnd[MCS_GROUP_RATES]; -+ -+ memset(sample_table, 0xff, sizeof(sample_table)); -+ for (col = 0; col < SAMPLE_COLUMNS; col++) { -+ for (i = 0; i < MCS_GROUP_RATES; i++) { -+ get_random_bytes(rnd, sizeof(rnd)); -+ new_idx = (i + rnd[i]) % MCS_GROUP_RATES; -+ -+ while (sample_table[col][new_idx] != 0xff) -+ new_idx = (new_idx + 1) % MCS_GROUP_RATES; -+ -+ sample_table[col][new_idx] = i; -+ } -+ } -+} -+ -+int __init -+rc80211_minstrel_ht_init(void) -+{ -+ init_sample_table(); -+ return ieee80211_rate_control_register(&mac80211_minstrel_ht); -+} -+ -+void -+rc80211_minstrel_ht_exit(void) -+{ -+ ieee80211_rate_control_unregister(&mac80211_minstrel_ht); -+} ---- /dev/null -+++ b/net/mac80211/rc80211_minstrel_ht.h -@@ -0,0 +1,128 @@ -+/* -+ * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org> -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 as -+ * published by the Free Software Foundation. -+ */ -+ -+#ifndef __RC_MINSTREL_HT_H -+#define __RC_MINSTREL_HT_H -+ -+/* -+ * The number of streams can be changed to 2 to reduce code -+ * size and memory footprint. -+ */ -+#define MINSTREL_MAX_STREAMS 3 -+#define MINSTREL_STREAM_GROUPS 4 -+ -+/* scaled fraction values */ -+#define MINSTREL_SCALE 16 -+#define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div) -+#define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE) -+ -+#define MCS_GROUP_RATES 8 -+ -+struct mcs_group { -+ u32 flags; -+ unsigned int streams; -+ unsigned int duration[MCS_GROUP_RATES]; -+}; -+ -+struct minstrel_rate_stats { -+ /* current / last sampling period attempts/success counters */ -+ unsigned int attempts, last_attempts; -+ unsigned int success, last_success; -+ -+ /* total attempts/success counters */ -+ u64 att_hist, succ_hist; -+ -+ /* current throughput */ -+ unsigned int cur_tp; -+ -+ /* packet delivery probabilities */ -+ unsigned int cur_prob, probability; -+ -+ /* maximum retry counts */ -+ unsigned int retry_count; -+ unsigned int retry_count_rtscts; -+ -+ bool retry_updated; -+ u8 sample_skipped; -+}; -+ -+struct minstrel_mcs_group_data { -+ u8 index; -+ u8 column; -+ -+ /* bitfield of supported MCS rates of this group */ -+ u8 supported; -+ -+ /* selected primary rates */ -+ unsigned int max_tp_rate; -+ unsigned int max_tp_rate2; -+ unsigned int max_prob_rate; -+ -+ /* MCS rate statistics */ -+ struct minstrel_rate_stats rates[MCS_GROUP_RATES]; -+}; -+ -+struct minstrel_ht_sta { -+ /* ampdu length (average, per sampling interval) */ -+ unsigned int ampdu_len; -+ unsigned int ampdu_packets; -+ -+ /* ampdu length (EWMA) */ -+ unsigned int avg_ampdu_len; -+ -+ /* best throughput rate */ -+ unsigned int max_tp_rate; -+ -+ /* second best throughput rate */ -+ unsigned int max_tp_rate2; -+ -+ /* best probability rate */ -+ unsigned int max_prob_rate; -+ -+ /* time of last status update */ -+ unsigned long stats_update; -+ -+ /* overhead time in usec for each frame */ -+ unsigned int overhead; -+ unsigned int overhead_rtscts; -+ -+ unsigned int total_packets; -+ unsigned int sample_packets; -+ -+ /* tx flags to add for frames for this sta */ -+ u32 tx_flags; -+ -+ u8 sample_wait; -+ u8 sample_tries; -+ u8 sample_count; -+ u8 sample_slow; -+ -+ /* current MCS group to be sampled */ -+ u8 sample_group; -+ -+ /* MCS rate group info and statistics */ -+ struct minstrel_mcs_group_data groups[MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS]; -+}; -+ -+struct minstrel_ht_sta_priv { -+ union { -+ struct minstrel_ht_sta ht; -+ struct minstrel_sta_info legacy; -+ }; -+#ifdef CONFIG_MAC80211_DEBUGFS -+ struct dentry *dbg_stats; -+#endif -+ void *ratelist; -+ void *sample_table; -+ bool is_ht; -+}; -+ -+void minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir); -+void minstrel_ht_remove_sta_debugfs(void *priv, void *priv_sta); -+ -+#endif ---- /dev/null -+++ b/net/mac80211/rc80211_minstrel_ht_debugfs.c -@@ -0,0 +1,120 @@ -+/* -+ * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org> -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 as -+ * published by the Free Software Foundation. -+ */ -+#include <linux/netdevice.h> -+#include <linux/types.h> -+#include <linux/skbuff.h> -+#include <linux/debugfs.h> -+#include <linux/ieee80211.h> -+#include <net/mac80211.h> -+#include "rc80211_minstrel.h" -+#include "rc80211_minstrel_ht.h" -+ -+extern const struct mcs_group minstrel_mcs_groups[]; -+ -+static int -+minstrel_ht_stats_open(struct inode *inode, struct file *file) -+{ -+ struct minstrel_ht_sta_priv *msp = inode->i_private; -+ struct minstrel_ht_sta *mi = &msp->ht; -+ struct minstrel_debugfs_info *ms; -+ unsigned int i, j, tp, prob, eprob; -+ char *p; -+ int ret; -+ -+ if (!msp->is_ht) { -+ inode->i_private = &msp->legacy; -+ ret = minstrel_stats_open(inode, file); -+ inode->i_private = msp; -+ return ret; -+ } -+ -+ ms = kmalloc(sizeof(*ms) + 8192, GFP_KERNEL); -+ if (!ms) -+ return -ENOMEM; -+ -+ file->private_data = ms; -+ p = ms->buf; -+ p += sprintf(p, "type rate throughput ewma prob this prob " -+ "this succ/attempt success attempts\n"); -+ for (i = 0; i < MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS; i++) { -+ char htmode = '2'; -+ char gimode = 'L'; -+ -+ if (!mi->groups[i].supported) -+ continue; -+ -+ if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) -+ htmode = '4'; -+ if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_SHORT_GI) -+ gimode = 'S'; -+ -+ for (j = 0; j < MCS_GROUP_RATES; j++) { -+ struct minstrel_rate_stats *mr = &mi->groups[i].rates[j]; -+ int idx = i * MCS_GROUP_RATES + j; -+ -+ if (!(mi->groups[i].supported & BIT(j))) -+ continue; -+ -+ p += sprintf(p, "HT%c0/%cGI ", htmode, gimode); -+ -+ *(p++) = (idx == mi->max_tp_rate) ? 'T' : ' '; -+ *(p++) = (idx == mi->max_tp_rate2) ? 't' : ' '; -+ *(p++) = (idx == mi->max_prob_rate) ? 'P' : ' '; -+ p += sprintf(p, "MCS%-2u", (minstrel_mcs_groups[i].streams - 1) * -+ MCS_GROUP_RATES + j); -+ -+ tp = mr->cur_tp / 10; -+ prob = MINSTREL_TRUNC(mr->cur_prob * 1000); -+ eprob = MINSTREL_TRUNC(mr->probability * 1000); -+ -+ p += sprintf(p, " %6u.%1u %6u.%1u %6u.%1u " -+ "%3u(%3u) %8llu %8llu\n", -+ tp / 10, tp % 10, -+ eprob / 10, eprob % 10, -+ prob / 10, prob % 10, -+ mr->last_success, -+ mr->last_attempts, -+ (unsigned long long)mr->succ_hist, -+ (unsigned long long)mr->att_hist); -+ } -+ } -+ p += sprintf(p, "\nTotal packet count:: ideal %d " -+ "lookaround %d\n", -+ max(0, (int) mi->total_packets - (int) mi->sample_packets), -+ mi->sample_packets); -+ p += sprintf(p, "Average A-MPDU length: %d.%d\n", -+ MINSTREL_TRUNC(mi->avg_ampdu_len), -+ MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10); -+ ms->len = p - ms->buf; -+ -+ return 0; -+} -+ -+static const struct file_operations minstrel_ht_stat_fops = { -+ .owner = THIS_MODULE, -+ .open = minstrel_ht_stats_open, -+ .read = minstrel_stats_read, -+ .release = minstrel_stats_release, -+}; -+ -+void -+minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir) -+{ -+ struct minstrel_ht_sta_priv *msp = priv_sta; -+ -+ msp->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, msp, -+ &minstrel_ht_stat_fops); -+} -+ -+void -+minstrel_ht_remove_sta_debugfs(void *priv, void *priv_sta) -+{ -+ struct minstrel_ht_sta_priv *msp = priv_sta; -+ -+ debugfs_remove(msp->dbg_stats); -+} |