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Commit 5e76ee4b authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
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tcp: tcp_mark_head_lost() optimization 



It will be a bit more expensive to get the head of rtx queue
once rtx queue is converted to an rb-tree.

We can avoid this extra cost in case tp->lost_skb_hint is set.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4e8cc228

net/ipv4/tcp_input.c

+4 −4
Original line number Diff line number Diff line
@@ -2207,12 +2207,12 @@ static void tcp_mark_head_lost(struct sock *sk, int packets, int mark_head) 
	const u32 loss_high = tcp_is_sack(tp) ?  tp->snd_nxt : tp->high_seq;



	WARN_ON(packets > tp->packets_out);

	if (tp->lost_skb_hint) {

	skb = tp->lost_skb_hint;

		cnt = tp->lost_cnt_hint;

	if (skb) {

		/* Head already handled? */

		if (mark_head && skb != tcp_write_queue_head(sk))

		if (mark_head && after(TCP_SKB_CB(skb)->seq, tp->snd_una))

			return;

		cnt = tp->lost_cnt_hint;

	} else {

		skb = tcp_write_queue_head(sk);

		cnt = 0;