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authorYuchung Cheng <ycheng@google.com>2014-03-03 12:31:36 -0800
committerDavid S. Miller <davem@davemloft.net>2014-03-03 15:58:03 -0500
commitf19c29e3e391a66a273e9afebaf01917245148cd (patch)
treeff123f596ed847774357b6d17526793bafb8b10a /net/ipv4/tcp_ipv4.c
parenta135e598c463baf9497b84e1e92f9a8f96d3521c (diff)
downloadblackbird-op-linux-f19c29e3e391a66a273e9afebaf01917245148cd.tar.gz
blackbird-op-linux-f19c29e3e391a66a273e9afebaf01917245148cd.zip
tcp: snmp stats for Fast Open, SYN rtx, and data pkts
Add the following snmp stats: TCPFastOpenActiveFail: Fast Open attempts (SYN/data) failed beacuse the remote does not accept it or the attempts timed out. TCPSynRetrans: number of SYN and SYN/ACK retransmits to break down retransmissions into SYN, fast-retransmits, timeout retransmits, etc. TCPOrigDataSent: number of outgoing packets with original data (excluding retransmission but including data-in-SYN). This counter is different from TcpOutSegs because TcpOutSegs also tracks pure ACKs. TCPOrigDataSent is more useful to track the TCP retransmission rate. Change TCPFastOpenActive to track only successful Fast Opens to be symmetric to TCPFastOpenPassive. Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Nandita Dukkipati <nanditad@google.com> Signed-off-by: Lawrence Brakmo <brakmo@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_ipv4.c')
-rw-r--r--net/ipv4/tcp_ipv4.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 17c0fb172fba..c4f1d9a76c44 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -854,8 +854,10 @@ static int tcp_v4_rtx_synack(struct sock *sk, struct request_sock *req)
{
int res = tcp_v4_send_synack(sk, NULL, req, 0);
- if (!res)
+ if (!res) {
TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS);
+ NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPSYNRETRANS);
+ }
return res;
}
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