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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>
This commit is contained in:
Eric Dumazet 2012-01-25 04:44:20 +00:00 committed by David S. Miller
parent bb349bb4b1
commit 09e9b813d3
3 changed files with 5 additions and 1 deletions
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1
include/linux/snmp.h
View File

@ -232,6 +232,7 @@ enum
LINUX_MIB_TCPTIMEWAITOVERFLOW, /* TCPTimeWaitOverflow */
LINUX_MIB_TCPREQQFULLDOCOOKIES, /* TCPReqQFullDoCookies */
LINUX_MIB_TCPREQQFULLDROP, /* TCPReqQFullDrop */
LINUX_MIB_TCPRETRANSFAIL, /* TCPRetransFail */
__LINUX_MIB_MAX
};

1
net/ipv4/proc.c
View File

@ -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
};

4
net/ipv4/tcp_output.c
View File

@ -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)