From b56ea2985d389a3676638203323ebe22c261b7fe Mon Sep 17 00:00:00 2001 From: Rick Jones Date: Tue, 21 Jul 2015 16:14:13 -0700 Subject: net: track success and failure of TCP PMTU probing Track success and failure of TCP PMTU probing. Signed-off-by: Rick Jones Signed-off-by: David S. Miller --- include/uapi/linux/snmp.h | 2 ++ net/ipv4/proc.c | 2 ++ net/ipv4/tcp_input.c | 2 ++ 3 files changed, 6 insertions(+) diff --git a/include/uapi/linux/snmp.h b/include/uapi/linux/snmp.h index eee8968407f0..25a9ad8bcef1 100644 --- a/include/uapi/linux/snmp.h +++ b/include/uapi/linux/snmp.h @@ -278,6 +278,8 @@ enum LINUX_MIB_TCPACKSKIPPEDCHALLENGE, /* TCPACKSkippedChallenge */ LINUX_MIB_TCPWINPROBE, /* TCPWinProbe */ LINUX_MIB_TCPKEEPALIVE, /* TCPKeepAlive */ + LINUX_MIB_TCPMTUPFAIL, /* TCPMTUPFail */ + LINUX_MIB_TCPMTUPSUCCESS, /* TCPMTUPSuccess */ __LINUX_MIB_MAX }; diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c index da5d483e236a..3abd9d7a3adf 100644 --- a/net/ipv4/proc.c +++ b/net/ipv4/proc.c @@ -300,6 +300,8 @@ static const struct snmp_mib snmp4_net_list[] = { SNMP_MIB_ITEM("TCPACKSkippedChallenge", LINUX_MIB_TCPACKSKIPPEDCHALLENGE), SNMP_MIB_ITEM("TCPWinProbe", LINUX_MIB_TCPWINPROBE), SNMP_MIB_ITEM("TCPKeepAlive", LINUX_MIB_TCPKEEPALIVE), + SNMP_MIB_ITEM("TCPMTUPFail", LINUX_MIB_TCPMTUPFAIL), + SNMP_MIB_ITEM("TCPMTUPSuccess", LINUX_MIB_TCPMTUPSUCCESS), SNMP_MIB_SENTINEL }; diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 1578fc2a6f39..cda3ffedadb6 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -2593,6 +2593,7 @@ static void tcp_mtup_probe_failed(struct sock *sk) icsk->icsk_mtup.search_high = icsk->icsk_mtup.probe_size - 1; icsk->icsk_mtup.probe_size = 0; + NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMTUPFAIL); } static void tcp_mtup_probe_success(struct sock *sk) @@ -2612,6 +2613,7 @@ static void tcp_mtup_probe_success(struct sock *sk) icsk->icsk_mtup.search_low = icsk->icsk_mtup.probe_size; icsk->icsk_mtup.probe_size = 0; tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); + NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMTUPSUCCESS); } /* Do a simple retransmit without using the backoff mechanisms in -- cgit v1.2.3-70-g09d2