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net/mac80211/rc80211_minstrel_ht.c
27.5 KB
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/* |
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* Copyright (C) 2010-2013 Felix Fietkau <nbd@openwrt.org> |
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* * 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 |
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/* 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)) |
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/* Transmission time (nanoseconds) for a packet containing (syms) symbols */ |
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#define MCS_SYMBOL_TIME(sgi, syms) \ (sgi ? \ |
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((syms) * 18000 + 4000) / 5 : /* syms * 3.6 us */ \ ((syms) * 1000) << 2 /* syms * 4 us */ \ |
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) /* 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))) |
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/* * Define group sort order: HT40 -> SGI -> #streams */ #define GROUP_IDX(_streams, _sgi, _ht40) \ MINSTREL_MAX_STREAMS * 2 * _ht40 + \ MINSTREL_MAX_STREAMS * _sgi + \ _streams - 1 |
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/* MCS rate information for an MCS group */ |
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#define MCS_GROUP(_streams, _sgi, _ht40) \ [GROUP_IDX(_streams, _sgi, _ht40)] = { \ |
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.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) \ } \ } |
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#define CCK_DURATION(_bitrate, _short, _len) \ |
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(1000 * (10 /* SIFS */ + \ |
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(_short ? 72 + 24 : 144 + 48 ) + \ |
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(8 * (_len + 4) * 10) / (_bitrate))) |
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#define CCK_ACK_DURATION(_bitrate, _short) \ (CCK_DURATION((_bitrate > 10 ? 20 : 10), false, 60) + \ CCK_DURATION(_bitrate, _short, AVG_PKT_SIZE)) #define CCK_DURATION_LIST(_short) \ CCK_ACK_DURATION(10, _short), \ CCK_ACK_DURATION(20, _short), \ CCK_ACK_DURATION(55, _short), \ CCK_ACK_DURATION(110, _short) #define CCK_GROUP \ [MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS] = { \ .streams = 0, \ .duration = { \ CCK_DURATION_LIST(false), \ CCK_DURATION_LIST(true) \ } \ } |
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/* * 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. |
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* * Sortorder has to be fixed for GROUP_IDX macro to be applicable: * HT40 -> SGI -> #streams |
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*/ 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 |
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/* must be last */ CCK_GROUP |
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}; |
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#define MINSTREL_CCK_GROUP (ARRAY_SIZE(minstrel_mcs_groups) - 1) |
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static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES]; |
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static void minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi); |
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/* |
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* Look up an MCS group index based on mac80211 rate information */ static int minstrel_ht_get_group_idx(struct ieee80211_tx_rate *rate) { |
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return GROUP_IDX((rate->idx / MCS_GROUP_RATES) + 1, !!(rate->flags & IEEE80211_TX_RC_SHORT_GI), !!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)); |
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} |
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static struct minstrel_rate_stats * minstrel_ht_get_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, struct ieee80211_tx_rate *rate) { int group, idx; if (rate->flags & IEEE80211_TX_RC_MCS) { group = minstrel_ht_get_group_idx(rate); idx = rate->idx % MCS_GROUP_RATES; } else { group = MINSTREL_CCK_GROUP; for (idx = 0; idx < ARRAY_SIZE(mp->cck_rates); idx++) if (rate->idx == mp->cck_rates[idx]) break; /* short preamble */ if (!(mi->groups[group].supported & BIT(idx))) idx += 4; } return &mi->groups[group].rates[idx]; } |
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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 |
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minstrel_calc_rate_ewma(struct minstrel_rate_stats *mr) |
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{ 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 |
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minstrel_ht_calc_tp(struct minstrel_ht_sta *mi, int group, int rate) |
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{ struct minstrel_rate_stats *mr; |
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unsigned int nsecs = 0; unsigned int tp; |
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unsigned int prob; |
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mr = &mi->groups[group].rates[rate]; |
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prob = mr->probability; |
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|
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if (prob < MINSTREL_FRAC(1, 10)) { |
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mr->cur_tp = 0; return; } |
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/* * For the throughput calculation, limit the probability value to 90% to * account for collision related packet error rate fluctuation */ if (prob > MINSTREL_FRAC(9, 10)) prob = MINSTREL_FRAC(9, 10); |
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if (group != MINSTREL_CCK_GROUP) |
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nsecs = 1000 * mi->overhead / MINSTREL_TRUNC(mi->avg_ampdu_len); |
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|
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nsecs += minstrel_mcs_groups[group].duration[rate]; tp = 1000000 * ((mr->probability * 1000) / nsecs); mr->cur_tp = MINSTREL_TRUNC(tp); |
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} /* * 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; |
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bool mi_rates_valid = false; |
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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; |
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for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { |
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bool mg_rates_valid = false; |
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cur_prob = 0; cur_prob_tp = 0; cur_tp = 0; cur_tp2 = 0; mg = &mi->groups[group]; if (!mg->supported) continue; |
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mi->sample_count++; for (i = 0; i < MCS_GROUP_RATES; i++) { if (!(mg->supported & BIT(i))) continue; |
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/* initialize rates selections starting indexes */ if (!mg_rates_valid) { mg->max_tp_rate = mg->max_tp_rate2 = mg->max_prob_rate = i; if (!mi_rates_valid) { mi->max_tp_rate = mi->max_tp_rate2 = mi->max_prob_rate = i; mi_rates_valid = true; } mg_rates_valid = true; } |
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mr = &mg->rates[i]; mr->retry_updated = false; index = MCS_GROUP_RATES * group + i; |
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minstrel_calc_rate_ewma(mr); minstrel_ht_calc_tp(mi, group, i); |
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if (!mr->cur_tp) continue; |
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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; |
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cur_prob_tp = mr->cur_tp; |
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} 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; } } } |
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/* try to sample all available rates during each interval */ mi->sample_count *= 8; |
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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; |
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mr = minstrel_get_ratestats(mi, mg->max_tp_rate); if (cur_tp < mr->cur_tp) { |
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mi->max_tp_rate2 = mi->max_tp_rate; cur_tp2 = cur_tp; |
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mi->max_tp_rate = mg->max_tp_rate; cur_tp = mr->cur_tp; |
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mi->max_prob_streams = minstrel_mcs_groups[group].streams - 1; |
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} 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; } } |
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if (mi->max_prob_streams < 1) mi->max_prob_streams = 1; |
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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 && |
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minstrel_mcs_groups[group].streams <= mi->max_prob_streams) { |
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mi->max_prob_rate = mg->max_prob_rate; cur_prob = mr->cur_prob; cur_prob_tp = mr->cur_tp; } } |
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mi->stats_update = jiffies; } static bool |
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minstrel_ht_txstat_valid(struct minstrel_priv *mp, struct ieee80211_tx_rate *rate) |
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{ |
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if (rate->idx < 0) |
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return false; |
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if (!rate->count) |
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return false; |
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if (rate->flags & IEEE80211_TX_RC_MCS) return true; return rate->idx == mp->cck_rates[0] || rate->idx == mp->cck_rates[1] || rate->idx == mp->cck_rates[2] || rate->idx == mp->cck_rates[3]; |
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} 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 |
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minstrel_downgrade_rate(struct minstrel_ht_sta *mi, unsigned int *idx, bool primary) |
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{ 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 |
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minstrel_aggr_check(struct ieee80211_sta *pubsta, struct sk_buff *skb) |
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{ 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; |
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if (likely(sta->ampdu_mlme.tid_tx[tid])) |
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return; |
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if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO) return; |
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ieee80211_start_tx_ba_session(pubsta, tid, 5000); |
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} 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; |
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bool last, update = false; |
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int i; |
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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; |
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if (!(info->flags & IEEE80211_TX_STAT_AMPDU)) { info->status.ampdu_ack_len = (info->flags & IEEE80211_TX_STAT_ACK ? 1 : 0); |
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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) { |
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mi->sample_wait = 16 + 2 * MINSTREL_TRUNC(mi->avg_ampdu_len); |
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mi->sample_tries = 1; |
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mi->sample_count--; } |
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if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) |
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mi->sample_packets += info->status.ampdu_len; |
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|
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last = !minstrel_ht_txstat_valid(mp, &ar[0]); |
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for (i = 0; !last; i++) { last = (i == IEEE80211_TX_MAX_RATES - 1) || |
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!minstrel_ht_txstat_valid(mp, &ar[i + 1]); |
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|
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rate = minstrel_ht_get_stats(mp, mi, &ar[i]); |
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|
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if (last) |
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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) < |
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MINSTREL_FRAC(20, 100)) { |
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minstrel_downgrade_rate(mi, &mi->max_tp_rate, true); |
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update = true; } |
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rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate2); |
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if (rate2->attempts > 30 && MINSTREL_FRAC(rate2->success, rate2->attempts) < |
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MINSTREL_FRAC(20, 100)) { |
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minstrel_downgrade_rate(mi, &mi->max_tp_rate2, false); |
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update = true; } |
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if (time_after(jiffies, mi->stats_update + (mp->update_interval / 2 * HZ) / 1000)) { |
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update = true; |
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minstrel_ht_update_stats(mp, mi); |
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if (!(info->flags & IEEE80211_TX_CTL_AMPDU) && mi->max_prob_rate / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) |
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minstrel_aggr_check(sta, skb); |
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} |
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if (update) minstrel_ht_update_rates(mp, mi); |
ec8aa669b mac80211: add the... |
514 515 516 517 518 519 520 521 522 523 |
} 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; |
8fddddff0 mac80211: fix con... |
524 |
unsigned int ctime = 0; |
ec8aa669b mac80211: add the... |
525 526 |
unsigned int t_slot = 9; /* FIXME */ unsigned int ampdu_len = MINSTREL_TRUNC(mi->avg_ampdu_len); |
a0497f9f5 mac80211/minstrel... |
527 |
unsigned int overhead = 0, overhead_rtscts = 0; |
ec8aa669b mac80211: add the... |
528 529 530 531 532 533 534 535 536 537 538 539 540 |
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]; |
ed97a13c5 mac80211/minstrel... |
541 |
tx_time_data = group->duration[index % MCS_GROUP_RATES] * ampdu_len / 1000; |
8fddddff0 mac80211: fix con... |
542 543 544 545 546 547 |
/* Contention time for first 2 tries */ ctime = (t_slot * cw) >> 1; cw = min((cw << 1) | 1, mp->cw_max); ctime += (t_slot * cw) >> 1; cw = min((cw << 1) | 1, mp->cw_max); |
a0497f9f5 mac80211/minstrel... |
548 549 550 551 |
if (index / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) { overhead = mi->overhead; overhead_rtscts = mi->overhead_rtscts; } |
8fddddff0 mac80211: fix con... |
552 |
/* Total TX time for data and Contention after first 2 tries */ |
a0497f9f5 mac80211/minstrel... |
553 554 |
tx_time = ctime + 2 * (overhead + tx_time_data); tx_time_rtscts = ctime + 2 * (overhead_rtscts + tx_time_data); |
8fddddff0 mac80211: fix con... |
555 556 |
/* See how many more tries we can fit inside segment size */ |
ec8aa669b mac80211: add the... |
557 |
do { |
8fddddff0 mac80211: fix con... |
558 559 560 561 562 |
/* Contention time for this try */ ctime = (t_slot * cw) >> 1; cw = min((cw << 1) | 1, mp->cw_max); /* Total TX time after this try */ |
a0497f9f5 mac80211/minstrel... |
563 564 |
tx_time += ctime + overhead + tx_time_data; tx_time_rtscts += ctime + overhead_rtscts + tx_time_data; |
8fddddff0 mac80211: fix con... |
565 |
|
ec8aa669b mac80211: add the... |
566 567 568 569 570 571 572 573 574 |
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, |
a85666627 mac80211/minstrel... |
575 |
struct ieee80211_sta_rates *ratetbl, int offset, int index) |
ec8aa669b mac80211: add the... |
576 577 578 |
{ const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; struct minstrel_rate_stats *mr; |
a85666627 mac80211/minstrel... |
579 580 |
u8 idx; u16 flags; |
ec8aa669b mac80211: add the... |
581 582 583 584 |
mr = minstrel_get_ratestats(mi, index); if (!mr->retry_updated) minstrel_calc_retransmit(mp, mi, index); |
a85666627 mac80211/minstrel... |
585 586 587 588 589 590 591 592 593 |
if (mr->probability < MINSTREL_FRAC(20, 100) || !mr->retry_count) { ratetbl->rate[offset].count = 2; ratetbl->rate[offset].count_rts = 2; ratetbl->rate[offset].count_cts = 2; } else { ratetbl->rate[offset].count = mr->retry_count; ratetbl->rate[offset].count_cts = mr->retry_count; ratetbl->rate[offset].count_rts = mr->retry_count_rtscts; } |
a0497f9f5 mac80211/minstrel... |
594 595 |
if (index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) { |
a85666627 mac80211/minstrel... |
596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 |
idx = mp->cck_rates[index % ARRAY_SIZE(mp->cck_rates)]; flags = 0; } else { idx = index % MCS_GROUP_RATES + (group->streams - 1) * MCS_GROUP_RATES; flags = IEEE80211_TX_RC_MCS | group->flags; } if (offset > 0) { ratetbl->rate[offset].count = ratetbl->rate[offset].count_rts; flags |= IEEE80211_TX_RC_USE_RTS_CTS; } ratetbl->rate[offset].idx = idx; ratetbl->rate[offset].flags = flags; } static void minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) { struct ieee80211_sta_rates *rates; int i = 0; rates = kzalloc(sizeof(*rates), GFP_ATOMIC); if (!rates) |
a0497f9f5 mac80211/minstrel... |
621 |
return; |
a85666627 mac80211/minstrel... |
622 623 624 625 626 627 628 629 630 631 632 633 634 |
/* Start with max_tp_rate */ minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate); if (mp->hw->max_rates >= 3) { /* At least 3 tx rates supported, use max_tp_rate2 next */ minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate2); } if (mp->hw->max_rates >= 2) { /* * At least 2 tx rates supported, use max_prob_rate next */ minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_prob_rate); |
a0497f9f5 mac80211/minstrel... |
635 |
} |
a85666627 mac80211/minstrel... |
636 637 |
rates->rate[i].idx = -1; rate_control_set_rates(mp->hw, mi->sta, rates); |
ec8aa669b mac80211: add the... |
638 639 640 641 642 643 644 645 646 647 648 649 650 651 |
} 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; |
965237ab9 mac80211/minstrel... |
652 |
unsigned int sample_dur, sample_group; |
ec8aa669b mac80211: add the... |
653 654 655 656 657 658 659 660 661 |
int sample_idx = 0; if (mi->sample_wait > 0) { mi->sample_wait--; return -1; } if (!mi->sample_tries) return -1; |
ec8aa669b mac80211: add the... |
662 663 664 |
mg = &mi->groups[mi->sample_group]; sample_idx = sample_table[mg->column][mg->index]; mr = &mg->rates[sample_idx]; |
965237ab9 mac80211/minstrel... |
665 666 |
sample_group = mi->sample_group; sample_idx += sample_group * MCS_GROUP_RATES; |
8d5eab5aa mac80211: update ... |
667 |
minstrel_next_sample_idx(mi); |
ec8aa669b mac80211: add the... |
668 669 |
/* |
ba6fa29c6 mac80211: Don't s... |
670 671 |
* Sampling might add some overhead (RTS, no aggregation) * to the frame. Hence, don't use sampling for the currently |
a0ca796c4 mac80211/minstrel... |
672 |
* used rates. |
ba6fa29c6 mac80211: Don't s... |
673 |
*/ |
a0ca796c4 mac80211/minstrel... |
674 675 676 |
if (sample_idx == mi->max_tp_rate || sample_idx == mi->max_tp_rate2 || sample_idx == mi->max_prob_rate) |
ba6fa29c6 mac80211: Don't s... |
677 |
return -1; |
a0ca796c4 mac80211/minstrel... |
678 |
|
ba6fa29c6 mac80211: Don't s... |
679 |
/* |
bc96f2426 mac80211/minstrel... |
680 681 |
* Do not sample if the probability is already higher than 95% * to avoid wasting airtime. |
ec8aa669b mac80211: add the... |
682 |
*/ |
bc96f2426 mac80211/minstrel... |
683 |
if (mr->probability > MINSTREL_FRAC(95, 100)) |
8d5eab5aa mac80211: update ... |
684 |
return -1; |
ec8aa669b mac80211: add the... |
685 686 687 688 689 |
/* * Make sure that lower rates get sampled only occasionally, * if the link is working perfectly. */ |
965237ab9 mac80211/minstrel... |
690 691 692 693 694 |
sample_dur = minstrel_get_duration(sample_idx); if (sample_dur >= minstrel_get_duration(mi->max_tp_rate2) && (mi->max_prob_streams < minstrel_mcs_groups[sample_group].streams || sample_dur >= minstrel_get_duration(mi->max_prob_rate))) { |
c7317e41d mac80211: minstre... |
695 |
if (mr->sample_skipped < 20) |
8d5eab5aa mac80211: update ... |
696 |
return -1; |
ec8aa669b mac80211: add the... |
697 698 |
if (mi->sample_slow++ > 2) |
8d5eab5aa mac80211: update ... |
699 |
return -1; |
ec8aa669b mac80211: add the... |
700 |
} |
098b8afbf mac80211/minstrel... |
701 |
mi->sample_tries--; |
ec8aa669b mac80211: add the... |
702 703 |
return sample_idx; |
ec8aa669b mac80211: add the... |
704 705 706 |
} static void |
a0497f9f5 mac80211/minstrel... |
707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 |
minstrel_ht_check_cck_shortpreamble(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, bool val) { u8 supported = mi->groups[MINSTREL_CCK_GROUP].supported; if (!supported || !mi->cck_supported_short) return; if (supported & (mi->cck_supported_short << (val * 4))) return; supported ^= mi->cck_supported_short | (mi->cck_supported_short << 4); mi->groups[MINSTREL_CCK_GROUP].supported = supported; } static void |
ec8aa669b mac80211: add the... |
723 724 725 |
minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta, struct ieee80211_tx_rate_control *txrc) { |
a85666627 mac80211/minstrel... |
726 |
const struct mcs_group *sample_group; |
ec8aa669b mac80211: add the... |
727 |
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); |
a85666627 mac80211/minstrel... |
728 |
struct ieee80211_tx_rate *rate = &info->status.rates[0]; |
ec8aa669b mac80211: add the... |
729 730 731 732 733 734 735 736 737 738 739 740 |
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; |
a0497f9f5 mac80211/minstrel... |
741 |
minstrel_ht_check_cck_shortpreamble(mp, mi, txrc->short_preamble); |
6de062ced mac80211: Don't u... |
742 743 744 745 746 747 748 |
/* Don't use EAPOL frames for sampling on non-mrr hw */ if (mp->hw->max_rates == 1 && txrc->skb->protocol == cpu_to_be16(ETH_P_PAE)) sample_idx = -1; else sample_idx = minstrel_get_sample_rate(mp, mi); |
24f7580e8 minstrel_ht: fixe... |
749 750 751 |
#ifdef CONFIG_MAC80211_DEBUGFS /* use fixed index if set */ |
2a9e6c588 minstrel_ht: enab... |
752 753 754 755 756 757 |
if (mp->fixed_rate_idx != -1) { mi->max_tp_rate = mp->fixed_rate_idx; mi->max_tp_rate2 = mp->fixed_rate_idx; mi->max_prob_rate = mp->fixed_rate_idx; sample_idx = -1; } |
24f7580e8 minstrel_ht: fixe... |
758 |
#endif |
ec8aa669b mac80211: add the... |
759 760 761 762 763 764 765 |
mi->total_packets++; /* wraparound */ if (mi->total_packets == ~0) { mi->total_packets = 0; mi->sample_packets = 0; } |
a85666627 mac80211/minstrel... |
766 767 768 769 770 771 |
if (sample_idx < 0) return; sample_group = &minstrel_mcs_groups[sample_idx / MCS_GROUP_RATES]; info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; |
ef47a5e4f mac80211/minstrel... |
772 773 774 775 776 777 778 779 |
rate->count = 1; if (sample_idx / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) { int idx = sample_idx % ARRAY_SIZE(mp->cck_rates); rate->idx = mp->cck_rates[idx]; rate->flags = 0; return; } |
a85666627 mac80211/minstrel... |
780 781 782 |
rate->idx = sample_idx % MCS_GROUP_RATES + (sample_group->streams - 1) * MCS_GROUP_RATES; rate->flags = IEEE80211_TX_RC_MCS | sample_group->flags; |
ec8aa669b mac80211: add the... |
783 784 785 |
} static void |
a0497f9f5 mac80211/minstrel... |
786 787 788 789 790 791 792 793 |
minstrel_ht_update_cck(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, struct ieee80211_supported_band *sband, struct ieee80211_sta *sta) { int i; if (sband->band != IEEE80211_BAND_2GHZ) return; |
9ddc34b56 mac80211: add a f... |
794 795 |
if (!(mp->hw->flags & IEEE80211_HW_SUPPORTS_HT_CCK_RATES)) return; |
a0497f9f5 mac80211/minstrel... |
796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 |
mi->cck_supported = 0; mi->cck_supported_short = 0; for (i = 0; i < 4; i++) { if (!rate_supported(sta, sband->band, mp->cck_rates[i])) continue; mi->cck_supported |= BIT(i); if (sband->bitrates[i].flags & IEEE80211_RATE_SHORT_PREAMBLE) mi->cck_supported_short |= BIT(i); } mi->groups[MINSTREL_CCK_GROUP].supported = mi->cck_supported; } static void |
ec8aa669b mac80211: add the... |
811 |
minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband, |
64f68e5d1 mac80211: remove ... |
812 |
struct ieee80211_sta *sta, void *priv_sta) |
ec8aa669b mac80211: add the... |
813 814 815 816 817 |
{ 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; |
ec8aa669b mac80211: add the... |
818 |
u16 sta_cap = sta->ht_cap.cap; |
4dc217df6 mac80211: fix a c... |
819 |
int n_supported = 0; |
ec8aa669b mac80211: add the... |
820 821 822 823 824 |
int ack_dur; int stbc; int i; /* fall back to the old minstrel for legacy stations */ |
4dc217df6 mac80211: fix a c... |
825 826 |
if (!sta->ht_cap.ht_supported) goto use_legacy; |
ec8aa669b mac80211: add the... |
827 828 |
BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) != |
a0497f9f5 mac80211/minstrel... |
829 |
MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS + 1); |
ec8aa669b mac80211: add the... |
830 831 832 |
msp->is_ht = true; memset(mi, 0, sizeof(*mi)); |
a85666627 mac80211/minstrel... |
833 834 |
mi->sta = sta; |
ec8aa669b mac80211: add the... |
835 |
mi->stats_update = jiffies; |
4ee73f338 mac80211: remove ... |
836 837 |
ack_dur = ieee80211_frame_duration(sband->band, 10, 60, 1, 1); mi->overhead = ieee80211_frame_duration(sband->band, 0, 60, 1, 1) + ack_dur; |
ec8aa669b mac80211: add the... |
838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 |
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; stbc = (sta_cap & IEEE80211_HT_CAP_RX_STBC) >> IEEE80211_HT_CAP_RX_STBC_SHIFT; mi->tx_flags |= stbc << IEEE80211_TX_CTL_STBC_SHIFT; if (sta_cap & IEEE80211_HT_CAP_LDPC_CODING) mi->tx_flags |= IEEE80211_TX_CTL_LDPC; |
ec8aa669b mac80211: add the... |
858 |
for (i = 0; i < ARRAY_SIZE(mi->groups); i++) { |
ec8aa669b mac80211: add the... |
859 |
mi->groups[i].supported = 0; |
a0497f9f5 mac80211/minstrel... |
860 861 862 863 |
if (i == MINSTREL_CCK_GROUP) { minstrel_ht_update_cck(mp, mi, sband, sta); continue; } |
ec8aa669b mac80211: add the... |
864 |
if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_SHORT_GI) { |
e1a0c6b3a mac80211: stop to... |
865 866 867 868 869 870 871 |
if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) { if (!(sta_cap & IEEE80211_HT_CAP_SGI_40)) continue; } else { if (!(sta_cap & IEEE80211_HT_CAP_SGI_20)) continue; } |
ec8aa669b mac80211: add the... |
872 |
} |
e1a0c6b3a mac80211: stop to... |
873 874 |
if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH && sta->bandwidth < IEEE80211_STA_RX_BW_40) |
ec8aa669b mac80211: add the... |
875 |
continue; |
e9219779f mac80211: Disable... |
876 |
/* Mark MCS > 7 as unsupported if STA is in static SMPS mode */ |
af0ed69ba mac80211: stop mo... |
877 |
if (sta->smps_mode == IEEE80211_SMPS_STATIC && |
e9219779f mac80211: Disable... |
878 879 |
minstrel_mcs_groups[i].streams > 1) continue; |
ec8aa669b mac80211: add the... |
880 881 |
mi->groups[i].supported = mcs->rx_mask[minstrel_mcs_groups[i].streams - 1]; |
4dc217df6 mac80211: fix a c... |
882 883 884 |
if (mi->groups[i].supported) n_supported++; |
ec8aa669b mac80211: add the... |
885 |
} |
4dc217df6 mac80211: fix a c... |
886 887 888 |
if (!n_supported) goto use_legacy; |
a85666627 mac80211/minstrel... |
889 |
/* create an initial rate table with the lowest supported rates */ |
a36473621 mac80211: minstre... |
890 |
minstrel_ht_update_stats(mp, mi); |
a85666627 mac80211/minstrel... |
891 |
minstrel_ht_update_rates(mp, mi); |
a36473621 mac80211: minstre... |
892 |
|
4dc217df6 mac80211: fix a c... |
893 894 895 896 897 898 899 900 |
return; use_legacy: 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); |
ec8aa669b mac80211: add the... |
901 902 903 904 905 906 |
} static void minstrel_ht_rate_init(void *priv, struct ieee80211_supported_band *sband, struct ieee80211_sta *sta, void *priv_sta) { |
64f68e5d1 mac80211: remove ... |
907 |
minstrel_ht_update_caps(priv, sband, sta, priv_sta); |
ec8aa669b mac80211: add the... |
908 909 910 911 912 |
} static void minstrel_ht_rate_update(void *priv, struct ieee80211_supported_band *sband, struct ieee80211_sta *sta, void *priv_sta, |
64f68e5d1 mac80211: remove ... |
913 |
u32 changed) |
ec8aa669b mac80211: add the... |
914 |
{ |
64f68e5d1 mac80211: remove ... |
915 |
minstrel_ht_update_caps(priv, sband, sta, priv_sta); |
ec8aa669b mac80211: add the... |
916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 |
} 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; } |
472dd35cc mac80211: correct... |
933 |
msp = kzalloc(sizeof(*msp), gfp); |
ec8aa669b mac80211: add the... |
934 935 936 937 938 939 940 941 942 943 944 945 946 947 |
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: |
7e988014c mac80211: freeing... |
948 |
kfree(msp->ratelist); |
ec8aa669b mac80211: add the... |
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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); } |