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tcp: add helper for lost bit toggling 

This useful because we'd need to verifying soon in many places
which makes things slightly more complex than it used to be.

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 2008-09-20 21:19:22 -07:00 committed by David S. Miller
parent c8c213f20c
commit 41ea36e35a
1 changed files with 12 additions and 10 deletions
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22
net/ipv4/tcp_input.c
View File

@ -992,6 +992,16 @@ static void tcp_verify_retransmit_hint(struct tcp_sock *tp, struct sk_buff *skb)
tp->retransmit_skb_hint = NULL; tp->retransmit_skb_hint = NULL;
} }
static void tcp_skb_mark_lost(struct tcp_sock *tp, struct sk_buff *skb)
{
if (!(TCP_SKB_CB(skb)->sacked & (TCPCB_LOST|TCPCB_SACKED_ACKED))) {
tcp_verify_retransmit_hint(tp, skb);
tp->lost_out += tcp_skb_pcount(skb);
TCP_SKB_CB(skb)->sacked |= TCPCB_LOST;
}
}
/* This procedure tags the retransmission queue when SACKs arrive. /* This procedure tags the retransmission queue when SACKs arrive.
* *
* We have three tag bits: SACKED(S), RETRANS(R) and LOST(L). * We have three tag bits: SACKED(S), RETRANS(R) and LOST(L).
@ -2216,11 +2226,7 @@ static void tcp_mark_head_lost(struct sock *sk, int packets)
cnt = packets; cnt = packets;
} }
if (!(TCP_SKB_CB(skb)->sacked & (TCPCB_SACKED_ACKED|TCPCB_LOST))) { tcp_skb_mark_lost(tp, skb);
TCP_SKB_CB(skb)->sacked |= TCPCB_LOST;
tp->lost_out += tcp_skb_pcount(skb);
tcp_verify_retransmit_hint(tp, skb);
}
} }
tcp_verify_left_out(tp); tcp_verify_left_out(tp);
} }
@ -2262,11 +2268,7 @@ static void tcp_update_scoreboard(struct sock *sk, int fast_rexmit)
if (!tcp_skb_timedout(sk, skb)) if (!tcp_skb_timedout(sk, skb))
break; break;
if (!(TCP_SKB_CB(skb)->sacked & (TCPCB_SACKED_ACKED|TCPCB_LOST))) { tcp_skb_mark_lost(tp, skb);
TCP_SKB_CB(skb)->sacked |= TCPCB_LOST;
tp->lost_out += tcp_skb_pcount(skb);
tcp_verify_retransmit_hint(tp, skb);
}
} }
tp->scoreboard_skb_hint = skb; tp->scoreboard_skb_hint = skb;