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Message-ID: <4E82C0DD.6010304@intel.com>
Date: Wed, 28 Sep 2011 14:38:21 +0800
From: "Yan, Zheng" <zheng.z.yan@...el.com>
To: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
ilpo.jarvinen@...sinki.fi
Subject: [PATCH] tcp: properly update lost_cnt_hint during shifting
lost_skb_hint is used by tcp_mark_head_lost() to mark the first
unhandled skb. lost_cnt_hint is the number of sacked packets before
the lost_skb_hint. tcp_shifted_skb() shouldn't increase lost_cnt_hint
when shifting a sacked skb that is before the lost_skb_hint, because
packets in it are already counted.
Signed-off-by: Zheng Yan <zheng.z.yan@...el.com>
---
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 21fab3e..f712ace 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1390,9 +1390,14 @@ static int tcp_shifted_skb(struct sock *sk, struct sk_buff *skb,
BUG_ON(!pcount);
/* Tweak before seqno plays */
- if (!tcp_is_fack(tp) && tcp_is_sack(tp) && tp->lost_skb_hint &&
- !before(TCP_SKB_CB(tp->lost_skb_hint)->seq, TCP_SKB_CB(skb)->seq))
- tp->lost_cnt_hint += pcount;
+ if (!tcp_is_fack(tp) && tcp_is_sack(tp) && tp->lost_skb_hint) {
+ if (skb == tp->lost_skb_hint)
+ tp->lost_cnt_hint += pcount;
+ else if (!(TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED) &&
+ before(TCP_SKB_CB(skb)->seq,
+ TCP_SKB_CB(tp->lost_skb_hint)->seq))
+ tp->lost_cnt_hint += pcount;
+ }
TCP_SKB_CB(prev)->end_seq += shifted;
TCP_SKB_CB(skb)->seq += shifted;
--
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