diff --git a/net/mac80211/rc80211_minstrel.c b/net/mac80211/rc80211_minstrel.c index eda290fb8bd2..ac7ef5414bde 100644 --- a/net/mac80211/rc80211_minstrel.c +++ b/net/mac80211/rc80211_minstrel.c @@ -83,6 +83,50 @@ minstrel_sort_best_tp_rates(struct minstrel_sta_info *mi, int i, u8 *tp_list) tp_list[j] = i; } +static void +minstrel_set_rate(struct minstrel_sta_info *mi, struct ieee80211_sta_rates *ratetbl, + int offset, int idx) +{ + struct minstrel_rate *r = &mi->r[idx]; + + ratetbl->rate[offset].idx = r->rix; + ratetbl->rate[offset].count = r->adjusted_retry_count; + ratetbl->rate[offset].count_cts = r->retry_count_cts; + ratetbl->rate[offset].count_rts = r->retry_count_rtscts; +} + +static void +minstrel_update_rates(struct minstrel_priv *mp, struct minstrel_sta_info *mi) +{ + struct ieee80211_sta_rates *ratetbl; + int i = 0; + + ratetbl = kzalloc(sizeof(*ratetbl), GFP_ATOMIC); + if (!ratetbl) + return; + + /* Start with max_tp_rate */ + minstrel_set_rate(mi, ratetbl, i++, mi->max_tp_rate[0]); + + if (mp->hw->max_rates >= 3) { + /* At least 3 tx rates supported, use max_tp_rate2 next */ + minstrel_set_rate(mi, ratetbl, i++, mi->max_tp_rate[1]); + } + + if (mp->hw->max_rates >= 2) { + /* At least 2 tx rates supported, use max_prob_rate next */ + minstrel_set_rate(mi, ratetbl, i++, mi->max_prob_rate); + } + + /* Use lowest rate last */ + ratetbl->rate[i].idx = mi->lowest_rix; + ratetbl->rate[i].count = mp->max_retry; + ratetbl->rate[i].count_cts = mp->max_retry; + ratetbl->rate[i].count_rts = mp->max_retry; + + rate_control_set_rates(mp->hw, mi->sta, ratetbl); +} + static void minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi) { @@ -161,6 +205,8 @@ minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi) /* Reset update timer */ mi->stats_update = jiffies; + + minstrel_update_rates(mp, mi); } static void @@ -240,13 +286,12 @@ minstrel_get_rate(void *priv, struct ieee80211_sta *sta, struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct minstrel_sta_info *mi = priv_sta; struct minstrel_priv *mp = priv; - struct ieee80211_tx_rate *ar = info->control.rates; - unsigned int ndx, sample_ndx = 0; + struct ieee80211_tx_rate *rate = &info->control.rates[0]; + struct minstrel_rate *msr, *mr; + unsigned int ndx; bool mrr_capable; - bool indirect_rate_sampling = false; - bool rate_sampling = false; - int i, delta; - int mrr_ndx[3]; + bool prev_sample = mi->prev_sample; + int delta; int sampling_ratio; /* management/no-ack frames do not use rate control */ @@ -262,107 +307,75 @@ minstrel_get_rate(void *priv, struct ieee80211_sta *sta, else sampling_ratio = mp->lookaround_rate; - /* init rateindex [ndx] with max throughput rate */ - ndx = mi->max_tp_rate[0]; - /* increase sum packet counter */ mi->packet_count++; delta = (mi->packet_count * sampling_ratio / 100) - (mi->sample_count + mi->sample_deferred / 2); - /* delta > 0: sampling required */ - if ((delta > 0) && (mrr_capable || !mi->prev_sample)) { - struct minstrel_rate *msr; - if (mi->packet_count >= 10000) { - mi->sample_deferred = 0; - mi->sample_count = 0; - mi->packet_count = 0; - } else if (delta > mi->n_rates * 2) { - /* 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_count += (delta - mi->n_rates * 2); - } + /* delta < 0: no sampling required */ + mi->prev_sample = false; + if (delta < 0 || (!mrr_capable && prev_sample)) + return; - /* get next random rate sample */ - sample_ndx = minstrel_get_next_sample(mi); - msr = &mi->r[sample_ndx]; - rate_sampling = true; - - /* Decide if direct ( 1st mrr stage) or indirect (2nd mrr stage) - * rate sampling method should be used. - * Respect such rates that are not sampled for 20 interations. - */ - if (mrr_capable && - msr->perfect_tx_time > mi->r[ndx].perfect_tx_time && - msr->sample_skipped < 20) - indirect_rate_sampling = true; - - if (!indirect_rate_sampling) { - if (msr->sample_limit != 0) { - ndx = sample_ndx; - mi->sample_count++; - if (msr->sample_limit > 0) - msr->sample_limit--; - } else - rate_sampling = false; - } else { - /* Only use IEEE80211_TX_CTL_RATE_CTRL_PROBE to mark - * packets that have the sampling rate deferred to the - * second MRR stage. Increase the sample counter only - * if the deferred sample rate was actually used. - * Use the sample_deferred counter to make sure that - * the sampling is not done in large bursts */ - info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; - mi->sample_deferred++; - } + if (mi->packet_count >= 10000) { + mi->sample_deferred = 0; + mi->sample_count = 0; + mi->packet_count = 0; + } else if (delta > mi->n_rates * 2) { + /* 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_count += (delta - mi->n_rates * 2); + } + + /* get next random rate sample */ + ndx = minstrel_get_next_sample(mi); + msr = &mi->r[ndx]; + mr = &mi->r[mi->max_tp_rate[0]]; + + /* Decide if direct ( 1st mrr stage) or indirect (2nd mrr stage) + * rate sampling method should be used. + * Respect such rates that are not sampled for 20 interations. + */ + if (mrr_capable && + msr->perfect_tx_time > mr->perfect_tx_time && + msr->sample_skipped < 20) { + /* Only use IEEE80211_TX_CTL_RATE_CTRL_PROBE to mark + * packets that have the sampling rate deferred to the + * second MRR stage. Increase the sample counter only + * if the deferred sample rate was actually used. + * Use the sample_deferred counter to make sure that + * the sampling is not done in large bursts */ + info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; + rate++; + mi->sample_deferred++; + } else { + if (!msr->sample_limit != 0) + return; + + mi->sample_count++; + if (msr->sample_limit > 0) + msr->sample_limit--; } - mi->prev_sample = rate_sampling; /* If we're not using MRR and the sampling rate already * has a probability of >95%, we shouldn't be attempting * to use it, as this only wastes precious airtime */ - if (!mrr_capable && rate_sampling && + if (!mrr_capable && (mi->r[ndx].probability > MINSTREL_FRAC(95, 100))) - ndx = mi->max_tp_rate[0]; - - /* mrr setup for 1st stage */ - ar[0].idx = mi->r[ndx].rix; - ar[0].count = minstrel_get_retry_count(&mi->r[ndx], info); - - /* non mrr setup for 2nd stage */ - if (!mrr_capable) { - if (!rate_sampling) - ar[0].count = mp->max_retry; - ar[1].idx = mi->lowest_rix; - ar[1].count = mp->max_retry; return; - } - /* mrr setup for 2nd stage */ - if (rate_sampling) { - if (indirect_rate_sampling) - mrr_ndx[0] = sample_ndx; - else - mrr_ndx[0] = mi->max_tp_rate[0]; - } else { - mrr_ndx[0] = mi->max_tp_rate[1]; - } + mi->prev_sample = true; - /* mrr setup for 3rd & 4th stage */ - mrr_ndx[1] = mi->max_prob_rate; - mrr_ndx[2] = 0; - for (i = 1; i < 4; i++) { - ar[i].idx = mi->r[mrr_ndx[i - 1]].rix; - ar[i].count = mi->r[mrr_ndx[i - 1]].adjusted_retry_count; - } + rate->idx = mi->r[ndx].rix; + rate->count = minstrel_get_retry_count(&mi->r[ndx], info); } @@ -412,12 +425,16 @@ minstrel_rate_init(void *priv, struct ieee80211_supported_band *sband, unsigned int i, n = 0; unsigned int t_slot = 9; /* FIXME: get real slot time */ + mi->sta = sta; mi->lowest_rix = rate_lowest_index(sband, sta); ctl_rate = &sband->bitrates[mi->lowest_rix]; mi->sp_ack_dur = ieee80211_frame_duration(sband->band, 10, ctl_rate->bitrate, !!(ctl_rate->flags & IEEE80211_RATE_ERP_G), 1); + memset(mi->max_tp_rate, 0, sizeof(mi->max_tp_rate)); + mi->max_prob_rate = 0; + for (i = 0; i < sband->n_bitrates; i++) { struct minstrel_rate *mr = &mi->r[n]; unsigned int tx_time = 0, tx_time_cts = 0, tx_time_rtscts = 0; @@ -473,6 +490,7 @@ minstrel_rate_init(void *priv, struct ieee80211_supported_band *sband, mi->stats_update = jiffies; init_sample_table(mi); + minstrel_update_rates(mp, mi); } static void * diff --git a/net/mac80211/rc80211_minstrel.h b/net/mac80211/rc80211_minstrel.h index b9f8535fa15c..f4301f4b2e41 100644 --- a/net/mac80211/rc80211_minstrel.h +++ b/net/mac80211/rc80211_minstrel.h @@ -63,6 +63,8 @@ struct minstrel_rate { }; struct minstrel_sta_info { + struct ieee80211_sta *sta; + unsigned long stats_update; unsigned int sp_ack_dur; unsigned int rate_avg;