From: Johannes Berg <johannes.berg@xxxxxxxxx>
The conversion to the fast-xmit path lost proper aggregation session
timeout handling - the last_tx wasn't set on that path and the timer
would therefore incorrectly tear down the session periodically (with
those drivers/rate control algorithms that have a timeout.)
In case of iwlwifi, this was every 5 seconds and caused significant
throughput degradation.
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
net/mac80211/tx.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 82e1e8484593..8410bb3bf5e8 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -2719,9 +2719,12 @@ static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
- if (tid_tx &&
- !test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
- return false;
+ if (tid_tx) {
+ if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
+ return false;
+ if (tid_tx->timeout)
+ tid_tx->last_tx = jiffies;
+ }
}
/* after this point (skb is modified) we cannot return false */
--
2.1.4
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