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>
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@ -232,6 +232,7 @@ enum
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LINUX_MIB_TCPTIMEWAITOVERFLOW, /* TCPTimeWaitOverflow */
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LINUX_MIB_TCPREQQFULLDOCOOKIES, /* TCPReqQFullDoCookies */
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LINUX_MIB_TCPREQQFULLDROP, /* TCPReqQFullDrop */
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LINUX_MIB_TCPRETRANSFAIL, /* TCPRetransFail */
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__LINUX_MIB_MAX
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};
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@ -256,6 +256,7 @@ static const struct snmp_mib snmp4_net_list[] = {
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SNMP_MIB_ITEM("TCPTimeWaitOverflow", LINUX_MIB_TCPTIMEWAITOVERFLOW),
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SNMP_MIB_ITEM("TCPReqQFullDoCookies", LINUX_MIB_TCPREQQFULLDOCOOKIES),
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SNMP_MIB_ITEM("TCPReqQFullDrop", LINUX_MIB_TCPREQQFULLDROP),
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SNMP_MIB_ITEM("TCPRetransFail", LINUX_MIB_TCPRETRANSFAIL),
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SNMP_MIB_SENTINEL
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};
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@ -2308,8 +2308,10 @@ begin_fwd:
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if (sacked & (TCPCB_SACKED_ACKED|TCPCB_SACKED_RETRANS))
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continue;
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if (tcp_retransmit_skb(sk, skb))
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if (tcp_retransmit_skb(sk, skb)) {
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NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPRETRANSFAIL);
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return;
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}
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NET_INC_STATS_BH(sock_net(sk), mib_idx);
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if (inet_csk(sk)->icsk_ca_state == TCP_CA_Recovery)
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