Commit 02276f3c authored Feb 28, 2009 by Ilpo Järvinen Committed by David S. Miller Mar 02, 2009

tcp: fix corner case issue in segmentation during rexmitting



If cur_mss grew very recently so that the previously G/TSOed skb
now fits well into a single segment it would get send up in
parts unless we calculate # of segments again. This corner-case
could happen eg. after mtu probe completes or less than
previously sack blocks are required for the opposite direction.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent d3d2ae45

net/ipv4/tcp_output.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1921,6 +1921,8 @@ int tcp_retransmit_skb(struct sock sk, struct sk_buff skb)
		if (skb->len > cur_mss) {
		if (tcp_fragment(sk, skb, cur_mss, cur_mss))
		return -ENOMEM; /* We'll try again later. */
		} else {
		tcp_init_tso_segs(sk, skb, cur_mss);
		}

		tcp_retrans_try_collapse(sk, skb, cur_mss);