Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0dde7b5404a3d52dcd9ce66d46197f6c3ca97dda Commit: 0dde7b5404a3d52dcd9ce66d46197f6c3ca97dda Parent: 1a09404a2338163f181d170c7abdc2242b6c6f03 Author: Ilpo Järvinen <[EMAIL PROTECTED]> AuthorDate: Thu Sep 20 11:28:05 2007 -0700 Committer: David S. Miller <[EMAIL PROTECTED]> CommitDate: Wed Oct 10 16:52:08 2007 -0700
[TCP]: Maintain highest_sack accurately to the highest skb In general, it should not be necessary to call tcp_fragment for already SACKed skbs, but it's better to be safe than sorry. And indeed, it can be called from sacktag when a DSACK arrives or some ACK (with SACK) reordering occurs (sacktag could be made to avoid the call in the latter case though I'm not sure if it's worth of the trouble and added complexity to cover such marginal case). The collapse case has return for SACKED_ACKED case earlier, so just WARN_ON if internal inconsistency is detected for some reason. Signed-off-by: Ilpo Järvinen <[EMAIL PROTECTED]> Signed-off-by: David S. Miller <[EMAIL PROTECTED]> --- net/ipv4/tcp_output.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index d65d17b..9df5b2a 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -692,6 +692,9 @@ int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len, unsigned int mss TCP_SKB_CB(buff)->end_seq = TCP_SKB_CB(skb)->end_seq; TCP_SKB_CB(skb)->end_seq = TCP_SKB_CB(buff)->seq; + if (tp->sacked_out && (TCP_SKB_CB(skb)->seq == tp->highest_sack)) + tp->highest_sack = TCP_SKB_CB(buff)->seq; + /* PSH and FIN should only be set in the second packet. */ flags = TCP_SKB_CB(skb)->flags; TCP_SKB_CB(skb)->flags = flags & ~(TCPCB_FLAG_FIN|TCPCB_FLAG_PSH); @@ -1723,6 +1726,10 @@ static void tcp_retrans_try_collapse(struct sock *sk, struct sk_buff *skb, int m /* Update sequence range on original skb. */ TCP_SKB_CB(skb)->end_seq = TCP_SKB_CB(next_skb)->end_seq; + if (WARN_ON(tp->sacked_out && + (TCP_SKB_CB(next_skb)->seq == tp->highest_sack))) + return; + /* Merge over control information. */ flags |= TCP_SKB_CB(next_skb)->flags; /* This moves PSH/FIN etc. over */ TCP_SKB_CB(skb)->flags = flags; - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html