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From: Felix Fietkau <nbd@nbd.name>
Date: Sat, 16 Mar 2019 18:00:12 +0100
Subject: [PATCH] mac80211: run late dequeue late tx handlers without
holding fq->lock
Reduces lock contention on enqueue/dequeue of iTXQ packets
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -3526,6 +3526,7 @@ struct sk_buff *ieee80211_tx_dequeue(str
ieee80211_tx_result r;
struct ieee80211_vif *vif = txq->vif;
+begin:
spin_lock_bh(&fq->lock);
if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) ||
@@ -3542,11 +3543,12 @@ struct sk_buff *ieee80211_tx_dequeue(str
if (skb)
goto out;
-begin:
skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
if (!skb)
goto out;
+ spin_unlock_bh(&fq->lock);
+
hdr = (struct ieee80211_hdr *)skb->data;
info = IEEE80211_SKB_CB(skb);
@@ -3610,8 +3612,11 @@ begin:
skb = __skb_dequeue(&tx.skbs);
- if (!skb_queue_empty(&tx.skbs))
+ if (!skb_queue_empty(&tx.skbs)) {
+ spin_lock_bh(&fq->lock);
skb_queue_splice_tail(&tx.skbs, &txqi->frags);
+ spin_unlock_bh(&fq->lock);
+ }
}
if (skb && skb_has_frag_list(skb) &&
@@ -3650,6 +3655,7 @@ begin:
}
IEEE80211_SKB_CB(skb)->control.vif = vif;
+ return skb;
out:
spin_unlock_bh(&fq->lock);
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