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55 lines
1.2 KiB
55 lines
1.2 KiB
From: Felix Fietkau <nbd@nbd.name>
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Date: Sat, 16 Mar 2019 18:00:12 +0100
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Subject: [PATCH] mac80211: run late dequeue late tx handlers without
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holding fq->lock
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Reduces lock contention on enqueue/dequeue of iTXQ packets
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/net/mac80211/tx.c
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+++ b/net/mac80211/tx.c
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@@ -3518,6 +3518,7 @@ struct sk_buff *ieee80211_tx_dequeue(str
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ieee80211_tx_result r;
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struct ieee80211_vif *vif = txq->vif;
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+begin:
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spin_lock_bh(&fq->lock);
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if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) ||
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@@ -3534,11 +3535,12 @@ struct sk_buff *ieee80211_tx_dequeue(str
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if (skb)
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goto out;
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-begin:
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skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
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if (!skb)
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goto out;
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+ spin_unlock_bh(&fq->lock);
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+
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hdr = (struct ieee80211_hdr *)skb->data;
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info = IEEE80211_SKB_CB(skb);
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@@ -3602,8 +3604,11 @@ begin:
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skb = __skb_dequeue(&tx.skbs);
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- if (!skb_queue_empty(&tx.skbs))
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+ if (!skb_queue_empty(&tx.skbs)) {
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+ spin_lock_bh(&fq->lock);
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skb_queue_splice_tail(&tx.skbs, &txqi->frags);
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+ spin_unlock_bh(&fq->lock);
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+ }
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}
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if (skb && skb_has_frag_list(skb) &&
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@@ -3642,6 +3647,7 @@ begin:
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}
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IEEE80211_SKB_CB(skb)->control.vif = vif;
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+ return skb;
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out:
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spin_unlock_bh(&fq->lock);
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