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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2012-01-25 05:44:20 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-01-26 19:51:00 +0100 |
| commit | 09e9b813d34d9a09d64a64580a9959d8bae1f4f5 (patch) | |
| tree | 5e8616336466d89c10da8a52166213d345cbe060 | |
| parent | be2net: allocate more headroom in incoming skbs (diff) | |
| download | linux-09e9b813d34d9a09d64a64580a9959d8bae1f4f5.tar.xz linux-09e9b813d34d9a09d64a64580a9959d8bae1f4f5.zip | |
tcp: add LINUX_MIB_TCPRETRANSFAIL counter
It might be useful to get a counter of failed tcp_retransmit_skb()
calls.
Reported-by: Satoru Moriya <satoru.moriya@hds.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/linux/snmp.h | 1 | ||||
| -rw-r--r-- | net/ipv4/proc.c | 1 | ||||
| -rw-r--r-- | net/ipv4/tcp_output.c | 4 |
3 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/snmp.h b/include/linux/snmp.h index c1241c428179..8ee8af4e6da9 100644 --- a/include/linux/snmp.h +++ b/include/linux/snmp.h @@ -232,6 +232,7 @@ enum LINUX_MIB_TCPTIMEWAITOVERFLOW, /* TCPTimeWaitOverflow */ LINUX_MIB_TCPREQQFULLDOCOOKIES, /* TCPReqQFullDoCookies */ LINUX_MIB_TCPREQQFULLDROP, /* TCPReqQFullDrop */ + LINUX_MIB_TCPRETRANSFAIL, /* TCPRetransFail */ __LINUX_MIB_MAX }; diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c index 6afc807ee2ad..02d61079f08b 100644 --- a/net/ipv4/proc.c +++ b/net/ipv4/proc.c @@ -256,6 +256,7 @@ static const struct snmp_mib snmp4_net_list[] = { SNMP_MIB_ITEM("TCPTimeWaitOverflow", LINUX_MIB_TCPTIMEWAITOVERFLOW), SNMP_MIB_ITEM("TCPReqQFullDoCookies", LINUX_MIB_TCPREQQFULLDOCOOKIES), SNMP_MIB_ITEM("TCPReqQFullDrop", LINUX_MIB_TCPREQQFULLDROP), + SNMP_MIB_ITEM("TCPRetransFail", LINUX_MIB_TCPRETRANSFAIL), SNMP_MIB_SENTINEL }; diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 8c8de2780c7a..561550ab3c30 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -2308,8 +2308,10 @@ begin_fwd: if (sacked & (TCPCB_SACKED_ACKED|TCPCB_SACKED_RETRANS)) continue; - if (tcp_retransmit_skb(sk, skb)) + if (tcp_retransmit_skb(sk, skb)) { + NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPRETRANSFAIL); return; + } NET_INC_STATS_BH(sock_net(sk), mib_idx); if (inet_csk(sk)->icsk_ca_state == TCP_CA_Recovery) |