From 7f9c33e515353ea91afc62341161fead19e78567 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ilpo=20J=C3=A4rvinen?= Date: Fri, 23 Nov 2007 19:10:56 +0800 Subject: [PATCH] [TCP] MTUprobe: Cleanup send queue check (no need to loop) MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The original code has striking complexity to perform a query which can be reduced to a very simple compare. FIN seqno may be included to write_seq but it should not make any significant difference here compared to skb->len which was used previously. One won't end up there with SYN still queued. Use of write_seq check guarantees that there's a valid skb in send_head so I removed the extra check. Signed-off-by: Ilpo Järvinen Acked-by: John Heffner Signed-off-by: Herbert Xu --- net/ipv4/tcp_output.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 4f8a8a17891a..e5130a7fe181 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -1321,12 +1321,7 @@ static int tcp_mtu_probe(struct sock *sk) } /* Have enough data in the send queue to probe? */ - len = 0; - if ((skb = tcp_send_head(sk)) == NULL) - return -1; - while ((len += skb->len) < size_needed && !tcp_skb_is_last(sk, skb)) - skb = tcp_write_queue_next(sk, skb); - if (len < size_needed) + if (tp->write_seq - tp->snd_nxt < size_needed) return -1; if (tp->snd_wnd < size_needed) -- 2.20.1