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tcp: add LINUX_MIB_TCPRETRANSFAIL counter

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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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4
net/ipv4/tcp_output.c
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@@ -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)