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[TCP] MTUprobe: Cleanup send queue check (no need to loop)

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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 <ilpo.jarvinen@helsinki.fi>
Acked-by: John Heffner <jheffner@psc.edu>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ilpo Järvinen 2007-11-23 19:10:56 +08:00 committed by Herbert Xu
parent 91cc17c0e5
commit 7f9c33e515
1 changed files with 1 additions and 6 deletions
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7
net/ipv4/tcp_output.c
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@ -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)