[TCP]: DSACK signals data receival, be conservative
In case a DSACK is received, it's better to lower cwnd as it's a sign of data receival. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -103,6 +103,7 @@ int sysctl_tcp_abc __read_mostly;
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#define FLAG_SLOWPATH 0x100 /* Do not skip RFC checks for window update.*/
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#define FLAG_ONLY_ORIG_SACKED 0x200 /* SACKs only non-rexmit sent before RTO */
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#define FLAG_SND_UNA_ADVANCED 0x400 /* Snd_una was changed (!= FLAG_DATA_ACKED) */
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#define FLAG_DSACKING_ACK 0x800 /* SACK blocks contained DSACK info */
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#define FLAG_ACKED (FLAG_DATA_ACKED|FLAG_SYN_ACKED)
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#define FLAG_NOT_DUP (FLAG_DATA|FLAG_WIN_UPDATE|FLAG_ACKED)
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@ -966,12 +967,14 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
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/* Check for D-SACK. */
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if (before(ntohl(sp[0].start_seq), TCP_SKB_CB(ack_skb)->ack_seq)) {
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flag |= FLAG_DSACKING_ACK;
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found_dup_sack = 1;
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tp->rx_opt.sack_ok |= 4;
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NET_INC_STATS_BH(LINUX_MIB_TCPDSACKRECV);
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} else if (num_sacks > 1 &&
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!after(ntohl(sp[0].end_seq), ntohl(sp[1].end_seq)) &&
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!before(ntohl(sp[0].start_seq), ntohl(sp[1].start_seq))) {
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flag |= FLAG_DSACKING_ACK;
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found_dup_sack = 1;
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tp->rx_opt.sack_ok |= 4;
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NET_INC_STATS_BH(LINUX_MIB_TCPDSACKOFORECV);
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@ -1858,7 +1861,7 @@ static void tcp_cwnd_down(struct sock *sk, int flag)
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struct tcp_sock *tp = tcp_sk(sk);
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int decr = tp->snd_cwnd_cnt + 1;
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if ((flag&FLAG_ANY_PROGRESS) ||
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if ((flag&(FLAG_ANY_PROGRESS|FLAG_DSACKING_ACK)) ||
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(IsReno(tp) && !(flag&FLAG_NOT_DUP))) {
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tp->snd_cwnd_cnt = decr&1;
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decr >>= 1;
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