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[TCP]: Extracted rexmit hint clearing from the LOST marking code 

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilpo Järvinen 2007-04-20 22:56:38 -07:00 committed by David S. Miller
parent d738cd8fca
commit d8f4f2235a
1 changed files with 16 additions and 15 deletions
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31
net/ipv4/tcp_input.c
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@ -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);
}
}