From d8f4f2235abc7b30cf447ca3e22ac28326b12f28 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ilpo=20J=C3=A4rvinen?= Date: Fri, 20 Apr 2007 22:56:38 -0700 Subject: [PATCH] [TCP]: Extracted rexmit hint clearing from the LOST marking code MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Signed-off-by: Ilpo Järvinen Signed-off-by: David S. Miller --- net/ipv4/tcp_input.c | 31 ++++++++++++++++--------------- 1 file changed, 16 insertions(+), 15 deletions(-) diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 813f204..7d843c42 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -1765,6 +1765,20 @@ static inline void tcp_reset_reno_sack(struct tcp_sock *tp) tp->left_out = tp->lost_out; } +/* RFC: This is from the original, I doubt that this is necessary at all: + * clear xmit_retrans hint if seq of this skb is beyond hint. How could we + * retransmitted past LOST markings in the first place? I'm not fully sure + * about undo and end of connection cases, which can cause R without L? + */ +static void tcp_verify_retransmit_hint(struct tcp_sock *tp, + struct sk_buff *skb) +{ + if ((tp->retransmit_skb_hint != NULL) && + before(TCP_SKB_CB(skb)->seq, + TCP_SKB_CB(tp->retransmit_skb_hint)->seq)) + tp->retransmit_skb_hint = skb; +} + /* Mark head of queue up as lost. */ static void tcp_mark_head_lost(struct sock *sk, int packets, u32 high_seq) @@ -1795,14 +1809,7 @@ static void tcp_mark_head_lost(struct sock *sk, if (!(TCP_SKB_CB(skb)->sacked&TCPCB_TAGBITS)) { TCP_SKB_CB(skb)->sacked |= TCPCB_LOST; tp->lost_out += tcp_skb_pcount(skb); - - /* clear xmit_retransmit_queue hints - * if this is beyond hint */ - if (tp->retransmit_skb_hint != NULL && - before(TCP_SKB_CB(skb)->seq, - TCP_SKB_CB(tp->retransmit_skb_hint)->seq)) - tp->retransmit_skb_hint = NULL; - + tcp_verify_retransmit_hint(tp, skb); } } tcp_sync_left_out(tp); @@ -1843,13 +1850,7 @@ static void tcp_update_scoreboard(struct sock *sk) if (!(TCP_SKB_CB(skb)->sacked&TCPCB_TAGBITS)) { TCP_SKB_CB(skb)->sacked |= TCPCB_LOST; tp->lost_out += tcp_skb_pcount(skb); - - /* clear xmit_retrans hint */ - if (tp->retransmit_skb_hint && - before(TCP_SKB_CB(skb)->seq, - TCP_SKB_CB(tp->retransmit_skb_hint)->seq)) - - tp->retransmit_skb_hint = NULL; + tcp_verify_retransmit_hint(tp, skb); } } -- 2.7.4