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authorWeiping Pan <wpan@redhat.com>2014-04-18 12:27:46 +0800
committerDavid S. Miller <davem@davemloft.net>2014-04-20 18:18:56 -0400
commit86fd14ad1e8c4b8f5e9a7a27b26bdade91dd4bd0 (patch)
tree8f6dd795862f5b73f06c244c856d12ce0accc147 /net/ipv4/tcp_output.c
parent17d8ecb8ff791359c9d9a44bc766c3d4b87f37f7 (diff)
downloadop-kernel-dev-86fd14ad1e8c4b8f5e9a7a27b26bdade91dd4bd0.zip
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tcp: make tcp_cwnd_application_limited() static
Make tcp_cwnd_application_limited() static and move it from tcp_input.c to tcp_output.c Signed-off-by: Weiping Pan <wpan@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_output.c')
-rw-r--r--net/ipv4/tcp_output.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 025e250..29dde97 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1387,6 +1387,28 @@ unsigned int tcp_current_mss(struct sock *sk)
return mss_now;
}
+/* RFC2861, slow part. Adjust cwnd, after it was not full during one rto.
+ * As additional protections, we do not touch cwnd in retransmission phases,
+ * and if application hit its sndbuf limit recently.
+ */
+static void tcp_cwnd_application_limited(struct sock *sk)
+{
+ struct tcp_sock *tp = tcp_sk(sk);
+
+ if (inet_csk(sk)->icsk_ca_state == TCP_CA_Open &&
+ sk->sk_socket && !test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
+ /* Limited by application or receiver window. */
+ u32 init_win = tcp_init_cwnd(tp, __sk_dst_get(sk));
+ u32 win_used = max(tp->snd_cwnd_used, init_win);
+ if (win_used < tp->snd_cwnd) {
+ tp->snd_ssthresh = tcp_current_ssthresh(sk);
+ tp->snd_cwnd = (tp->snd_cwnd + win_used) >> 1;
+ }
+ tp->snd_cwnd_used = 0;
+ }
+ tp->snd_cwnd_stamp = tcp_time_stamp;
+}
+
/* Congestion window validation. (RFC2861) */
static void tcp_cwnd_validate(struct sock *sk)
{
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