From: David S. Miller <davem@davemloft.net>
Date: Sun, 12 Mar 2006 02:51:49 +0000 (-0800)
Subject: [TCP]: Fix tcp_tso_should_defer() when limit>=65536
X-Git-Tag: v2.6.16~58
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ba244fe9005323452428fee4b4b7d0c70a06b627;p=linux-2.6

[TCP]: Fix tcp_tso_should_defer() when limit>=65536

That's >= a full sized TSO frame, so we should always
return 0 in that case.

Based upon a report and initial patch from Lachlan
Andrew, final patch suggested by Herbert Xu.

Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index a7623ead39..9f498a6c88 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1036,6 +1036,10 @@ static int tcp_tso_should_defer(struct sock *sk, struct tcp_sock *tp, struct sk_
 
 	limit = min(send_win, cong_win);
 
+	/* If a full-sized TSO skb can be sent, do it. */
+	if (limit >= 65536)
+		return 0;
+
 	if (sysctl_tcp_tso_win_divisor) {
 		u32 chunk = min(tp->snd_wnd, tp->snd_cwnd * tp->mss_cache);