diff options
Diffstat (limited to 'net/mac80211/rc80211_minstrel_ht.c')
-rw-r--r-- | net/mac80211/rc80211_minstrel_ht.c | 54 |
1 files changed, 40 insertions, 14 deletions
diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c index 8212a8bebf06..333b5118be6d 100644 --- a/net/mac80211/rc80211_minstrel_ht.c +++ b/net/mac80211/rc80211_minstrel_ht.c @@ -259,7 +259,7 @@ minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) } } - /* try to sample up to half of the availble rates during each interval */ + /* try to sample up to half of the available rates during each interval */ mi->sample_count *= 4; cur_prob = 0; @@ -464,6 +464,7 @@ minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, const struct mcs_group *group; unsigned int tx_time, tx_time_rtscts, tx_time_data; unsigned int cw = mp->cw_min; + unsigned int ctime = 0; unsigned int t_slot = 9; /* FIXME */ unsigned int ampdu_len = MINSTREL_TRUNC(mi->avg_ampdu_len); @@ -480,13 +481,27 @@ minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, 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); + + /* 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); + + /* Total TX time for data and Contention after first 2 tries */ + tx_time = ctime + 2 * (mi->overhead + tx_time_data); + tx_time_rtscts = ctime + 2 * (mi->overhead_rtscts + tx_time_data); + + /* See how many more tries we can fit inside segment size */ 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; + /* Contention time for this try */ + ctime = (t_slot * cw) >> 1; + cw = min((cw << 1) | 1, mp->cw_max); + + /* Total TX time after this try */ + tx_time += ctime + mi->overhead + tx_time_data; + tx_time_rtscts += ctime + mi->overhead_rtscts + tx_time_data; + if (tx_time_rtscts < mp->segment_size) mr->retry_count_rtscts++; } while ((tx_time < mp->segment_size) && @@ -659,18 +674,14 @@ minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband, 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 n_supported = 0; int ack_dur; int stbc; int i; /* fall back to the old minstrel for legacy stations */ - if (!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); - } + if (!sta->ht_cap.ht_supported) + goto use_legacy; BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) != MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS); @@ -725,7 +736,22 @@ minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband, mi->groups[i].supported = mcs->rx_mask[minstrel_mcs_groups[i].streams - 1]; + + if (mi->groups[i].supported) + n_supported++; } + + if (!n_supported) + goto use_legacy; + + 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); } static void |