tcp: fix SNMP under-estimation on failed retransmission

Previously the SNMP counter LINUX_MIB_TCPRETRANSFAIL is not counting
the TSO/GSO properly on failed retransmission. This patch fixes that.

Signed-off-by: Yuchung Cheng <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: Neal Cardwell <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 3f510cad0b3ec884aeb23f58aaa597ec98c82c88..68b5326f73212ffe7111dd0f91e0a1246fb0ae25 100644 (file)
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2920,7 +2920,7 @@ int __tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb, int segs)
                TCP_SKB_CB(skb)->sacked |= TCPCB_EVER_RETRANS;
                trace_tcp_retransmit_skb(sk, skb);
        } else if (err != -EBUSY) {
-               NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPRETRANSFAIL);
+               NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPRETRANSFAIL, segs);
        }
        return err;
 }