diff options
| -rw-r--r-- | net/ipv4/tcp_input.c | 35 |
1 files changed, 17 insertions, 18 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 84bcdc94dfa..20c9440ab85 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -1444,12 +1444,17 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_ tp->retransmit_skb_hint = NULL; } } else { - /* New sack for not retransmitted frame, - * which was in hole. It is reordering. - */ - if (!(sacked & TCPCB_RETRANS) && - fack_count < prior_fackets) - reord = min(fack_count, reord); + if (!(sacked & TCPCB_RETRANS)) { + /* New sack for not retransmitted frame, + * which was in hole. It is reordering. + */ + if (fack_count < prior_fackets) + reord = min(fack_count, reord); + + /* SACK enhanced F-RTO (RFC4138; Appendix B) */ + if (!after(TCP_SKB_CB(skb)->end_seq, tp->frto_highmark)) + flag |= FLAG_ONLY_ORIG_SACKED; + } if (sacked & TCPCB_LOST) { TCP_SKB_CB(skb)->sacked &= ~TCPCB_LOST; @@ -1458,18 +1463,6 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_ /* clear lost hint */ tp->retransmit_skb_hint = NULL; } - /* SACK enhanced F-RTO detection. - * Set flag if and only if non-rexmitted - * segments below frto_highmark are - * SACKed (RFC4138; Appendix B). - * Clearing correct due to in-order walk - */ - if (after(end_seq, tp->frto_highmark)) { - flag &= ~FLAG_ONLY_ORIG_SACKED; - } else { - if (!(sacked & TCPCB_RETRANS)) - flag |= FLAG_ONLY_ORIG_SACKED; - } } TCP_SKB_CB(skb)->sacked |= TCPCB_SACKED_ACKED; @@ -1503,6 +1496,12 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_ tp->retransmit_skb_hint = NULL; } } + + /* SACK enhanced FRTO (RFC4138, Appendix B): Clearing correct + * due to in-order walk + */ + if (after(end_seq, tp->frto_highmark)) + flag &= ~FLAG_ONLY_ORIG_SACKED; } if (tp->retrans_out && |