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[TCP]: Avoid clearing sacktag hint in trivial situations

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There's no reason to clear the sacktag skb hint when small part
of the rexmit queue changes. Account changes (if any) instead when
fragmenting/collapsing. RTO/FRTO do not touch SACKED_ACKED bits so
no need to discard SACK tag hint at all.

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
2007-09-20 11:37:19 -07:00
committed by David S. Miller
parent c96fd3d461
commit b76892051c
3 changed files with 21 additions and 11 deletions
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6
include/net/tcp.h
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@@ -1067,11 +1067,15 @@ static inline void tcp_mib_init(void)
}
/* from STCP */
static inline void tcp_clear_all_retrans_hints(struct tcp_sock *tp) {
static inline void tcp_clear_retrans_hints_partial(struct tcp_sock *tp) {
tp->lost_skb_hint = NULL;
tp->scoreboard_skb_hint = NULL;
tp->retransmit_skb_hint = NULL;
tp->forward_skb_hint = NULL;
}
static inline void tcp_clear_all_retrans_hints(struct tcp_sock *tp) {
tcp_clear_retrans_hints_partial(tp);
tp->fastpath_skb_hint = NULL;
}