Prevents excessive A-MSDU aggregation at low data rates or bad
conditions.
Signed-off-by: Felix Fietkau <[email protected]>
---
net/mac80211/rc80211_minstrel_ht.c | 54 ++++++++++++++++++++++++++++++++++++++
1 file changed, 54 insertions(+)
diff --git a/net/mac80211/rc80211_minstrel_ht.c
b/net/mac80211/rc80211_minstrel_ht.c
index 3928dbd..a9d5b28 100644
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -882,6 +882,59 @@ minstrel_ht_set_rate(struct minstrel_priv *mp, struct
minstrel_ht_sta *mi,
ratetbl->rate[offset].flags = flags;
}
+static inline int
+minstrel_ht_get_prob_ewma(struct minstrel_ht_sta *mi, int rate)
+{
+ int group = rate / MCS_GROUP_RATES;
+ rate %= MCS_GROUP_RATES;
+ return mi->groups[group].rates[rate].prob_ewma;
+}
+
+static int
+minstrel_ht_get_max_amsdu_len(struct minstrel_ht_sta *mi)
+{
+ int group = mi->max_prob_rate / MCS_GROUP_RATES;
+ const struct mcs_group *g = &minstrel_mcs_groups[group];
+ int rate = mi->max_prob_rate % MCS_GROUP_RATES;
+
+ /* Disable A-MSDU if max_prob_rate is bad */
+ if (mi->groups[group].rates[rate].prob_ewma < MINSTREL_FRAC(50, 100))
+ return 1;
+
+ /* If the rate is slower than single-stream MCS1, make A-MSDU limit
small */
+ if (g->duration[rate] > MCS_DURATION(1, 0, 52))
+ return 500;
+
+ /*
+ * If the rate is slower than single-stream MCS4, limit A-MSDU to usual
+ * data packet size
+ */
+ if (g->duration[rate] > MCS_DURATION(1, 0, 104))
+ return 1600;
+
+ /*
+ * If the rate is slower than single-stream MCS7, or if the max
throughput
+ * rate success probability is less than 75%, limit A-MSDU to twice the
usual
+ * data packet size
+ */
+ if (g->duration[rate] > MCS_DURATION(1, 0, 260) ||
+ (minstrel_ht_get_prob_ewma(mi, mi->max_tp_rate[0]) <
+ MINSTREL_FRAC(75, 100)))
+ return 3200;
+
+ /*
+ * HT A-MPDU limits maximum MPDU size under BA agreement to 4095 bytes.
+ * Since aggregation sessions are started/stopped without txq flush, use
+ * the limit here to avoid the complexity of having to de-aggregate
+ * packets in the queue.
+ */
+ if (!mi->sta->vht_cap.vht_supported)
+ return IEEE80211_MAX_MPDU_LEN_HT_BA;
+
+ /* unlimited */
+ return 0;
+}
+
static void
minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
{
@@ -906,6 +959,7 @@ minstrel_ht_update_rates(struct minstrel_priv *mp, struct
minstrel_ht_sta *mi)
minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_prob_rate);
}
+ mi->sta->max_rc_amsdu_len = minstrel_ht_get_max_amsdu_len(mi);
rates->rate[i].idx = -1;
rate_control_set_rates(mp->hw, mi->sta, rates);
}
--
2.2.2
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