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authorDaikichi Osuga <osugad@s1.nttdocomo.co.jp>2006-08-29 02:01:44 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-08-29 21:22:16 -0700
commit3fdf3f0c99e90e167f0d0643fcc8739e27456697 (patch)
tree03e70416c6baca7db752d00d5623d43390d84714 /net/ipv4
parent76d0cc1b64e1686b2b53e081c94142dd99f01ec5 (diff)
[TCP]: Two RFC3465 Appropriate Byte Count fixes.
1) fix slow start after retransmit timeout 2) fix case of L=2*SMSS acked bytes comparison Signed-off-by: Daikichi Osuga <osugad@s1.nttdocomo.co.jp> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/tcp_cong.c2
-rw-r--r--net/ipv4/tcp_input.c9
2 files changed, 8 insertions, 3 deletions
diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
index 5765f9d0317..7ff2e4273a7 100644
--- a/net/ipv4/tcp_cong.c
+++ b/net/ipv4/tcp_cong.c
@@ -189,7 +189,7 @@ void tcp_slow_start(struct tcp_sock *tp)
return;
/* We MAY increase by 2 if discovered delayed ack */
- if (sysctl_tcp_abc > 1 && tp->bytes_acked > 2*tp->mss_cache) {
+ if (sysctl_tcp_abc > 1 && tp->bytes_acked >= 2*tp->mss_cache) {
if (tp->snd_cwnd < tp->snd_cwnd_clamp)
tp->snd_cwnd++;
}
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 104af5d5bcb..111ff39a08c 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2505,8 +2505,13 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag)
if (before(ack, prior_snd_una))
goto old_ack;
- if (sysctl_tcp_abc && icsk->icsk_ca_state < TCP_CA_CWR)
- tp->bytes_acked += ack - prior_snd_una;
+ if (sysctl_tcp_abc) {
+ if (icsk->icsk_ca_state < TCP_CA_CWR)
+ tp->bytes_acked += ack - prior_snd_una;
+ else if (icsk->icsk_ca_state == TCP_CA_Loss)
+ /* we assume just one segment left network */
+ tp->bytes_acked += min(ack - prior_snd_una, tp->mss_cache);
+ }
if (!(flag&FLAG_SLOWPATH) && after(ack, prior_snd_una)) {
/* Window is constant, pure forward advance.