From f2af2df800d3648b1d68e02d5b8a5d77cfee8970 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Sat, 16 Mar 2019 18:06:32 +0100 Subject: mac80211: calculate hash for fq without holding fq->lock in itxq enqueue MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Reduces lock contention on enqueue/dequeue of iTXQ packets Signed-off-by: Felix Fietkau Acked-by: Toke Høiland-Jørgensen Signed-off-by: Johannes Berg --- net/mac80211/tx.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) (limited to 'net/mac80211') diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 8a49a74c0a37..2c0fec888021 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -1399,11 +1399,15 @@ static void ieee80211_txq_enqueue(struct ieee80211_local *local, { struct fq *fq = &local->fq; struct fq_tin *tin = &txqi->tin; + u32 flow_idx = fq_flow_idx(fq, skb); ieee80211_set_skb_enqueue_time(skb); - fq_tin_enqueue(fq, tin, skb, + + spin_lock_bh(&fq->lock); + fq_tin_enqueue(fq, tin, flow_idx, skb, fq_skb_free_func, fq_flow_get_default_func); + spin_unlock_bh(&fq->lock); } static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, @@ -1590,7 +1594,6 @@ static bool ieee80211_queue_skb(struct ieee80211_local *local, struct sta_info *sta, struct sk_buff *skb) { - struct fq *fq = &local->fq; struct ieee80211_vif *vif; struct txq_info *txqi; @@ -1608,9 +1611,7 @@ static bool ieee80211_queue_skb(struct ieee80211_local *local, if (!txqi) return false; - spin_lock_bh(&fq->lock); ieee80211_txq_enqueue(local, txqi, skb); - spin_unlock_bh(&fq->lock); schedule_and_wake_txq(local, txqi); @@ -3221,6 +3222,7 @@ static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, u8 max_subframes = sta->sta.max_amsdu_subframes; int max_frags = local->hw.max_tx_fragments; int max_amsdu_len = sta->sta.max_amsdu_len; + u32 flow_idx; __be16 len; void *data; bool ret = false; @@ -3249,6 +3251,8 @@ static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, max_amsdu_len = min_t(int, max_amsdu_len, sta->sta.max_tid_amsdu_len[tid]); + flow_idx = fq_flow_idx(fq, skb); + spin_lock_bh(&fq->lock); /* TODO: Ideally aggregation should be done on dequeue to remain @@ -3256,7 +3260,8 @@ static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, */ tin = &txqi->tin; - flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func); + flow = fq_flow_classify(fq, tin, flow_idx, skb, + fq_flow_get_default_func); head = skb_peek_tail(&flow->queue); if (!head || skb_is_gso(head)) goto out; -- cgit v1.2.3-59-g8ed1b