From 6a27b2c40b4829e625bc1dfdd0705c5ece720ab4 Mon Sep 17 00:00:00 2001 From: Thomas Huehn Date: Tue, 24 Mar 2015 21:09:40 +0100 Subject: mac80211: restructure per-rate throughput calculation into function This patch moves Minstrels and Minstrel-HTs per-rate throughput calculation (EWMA(thr)) into a dedicated function to be called. Therefore the variable "unsigned int cur_tp" within struct "minstrel_rate_stats" becomes obsolete. and is removed to free up its space. Signed-off-by: Thomas Huehn Acked-by: Felix Fietkau Signed-off-by: Johannes Berg --- net/mac80211/rc80211_minstrel.c | 43 +++++++++++++++++++++++++++-------------- 1 file changed, 28 insertions(+), 15 deletions(-) (limited to 'net/mac80211/rc80211_minstrel.c') diff --git a/net/mac80211/rc80211_minstrel.c b/net/mac80211/rc80211_minstrel.c index c86e42b67908..61a857bca971 100644 --- a/net/mac80211/rc80211_minstrel.c +++ b/net/mac80211/rc80211_minstrel.c @@ -69,14 +69,32 @@ rix_to_ndx(struct minstrel_sta_info *mi, int rix) return i; } +/* return current EMWA throughput */ +int minstrel_get_tp_avg(struct minstrel_rate *mr) +{ + int usecs; + + usecs = mr->perfect_tx_time; + if (!usecs) + usecs = 1000000; + + /* reset thr. below 10% success */ + if (mr->stats.prob_ewma < MINSTREL_FRAC(10, 100)) + return 0; + else + return MINSTREL_TRUNC(mr->stats.prob_ewma * (100000 / usecs)); +} + /* find & sort topmost throughput rates */ static inline void minstrel_sort_best_tp_rates(struct minstrel_sta_info *mi, int i, u8 *tp_list) { int j = MAX_THR_RATES; - while (j > 0 && mi->r[i].stats.cur_tp > mi->r[tp_list[j - 1]].stats.cur_tp) + while (j > 0 && (minstrel_get_tp_avg(&mi->r[i]) > + minstrel_get_tp_avg(&mi->r[tp_list[j - 1]]))) j--; + if (j < MAX_THR_RATES - 1) memmove(&tp_list[j + 1], &tp_list[j], MAX_THR_RATES - (j + 1)); if (j < MAX_THR_RATES) @@ -158,8 +176,7 @@ minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi) { u8 tmp_tp_rate[MAX_THR_RATES]; u8 tmp_prob_rate = 0; - u32 usecs; - int i; + int i, tmp_cur_tp, tmp_prob_tp; for (i = 0; i < MAX_THR_RATES; i++) tmp_tp_rate[i] = 0; @@ -168,19 +185,9 @@ minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi) struct minstrel_rate *mr = &mi->r[i]; struct minstrel_rate_stats *mrs = &mi->r[i].stats; - usecs = mr->perfect_tx_time; - if (!usecs) - usecs = 1000000; - /* Update success probabilities per rate */ minstrel_calc_rate_stats(mrs); - /* Update throughput per rate, reset thr. below 10% success */ - if (mrs->prob_ewma < MINSTREL_FRAC(10, 100)) - mrs->cur_tp = 0; - else - mrs->cur_tp = mrs->prob_ewma * (1000000 / usecs); - /* Sample less often below the 10% chance of success. * Sample less often above the 95% chance of success. */ if (mrs->prob_ewma > MINSTREL_FRAC(95, 100) || @@ -205,7 +212,9 @@ minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi) * (2) if all success probabilities < 95%, the rate with * highest success probability is chosen as max_prob_rate */ if (mrs->prob_ewma >= MINSTREL_FRAC(95, 100)) { - if (mrs->cur_tp >= mi->r[tmp_prob_rate].stats.cur_tp) + tmp_cur_tp = minstrel_get_tp_avg(mr); + tmp_prob_tp = minstrel_get_tp_avg(&mi->r[tmp_prob_rate]); + if (tmp_cur_tp >= tmp_prob_tp) tmp_prob_rate = i; } else { if (mrs->prob_ewma >= mi->r[tmp_prob_rate].stats.prob_ewma) @@ -676,11 +685,15 @@ static u32 minstrel_get_expected_throughput(void *priv_sta) { struct minstrel_sta_info *mi = priv_sta; int idx = mi->max_tp_rate[0]; + int tmp_cur_tp; /* convert pkt per sec in kbps (1200 is the average pkt size used for * computing cur_tp */ - return MINSTREL_TRUNC(mi->r[idx].stats.cur_tp) * 1200 * 8 / 1024; + tmp_cur_tp = minstrel_get_tp_avg(&mi->r[idx]); + tmp_cur_tp = tmp_cur_tp * 1200 * 8 / 1024; + + return tmp_cur_tp; } const struct rate_control_ops mac80211_minstrel = { -- cgit v1.2.3