tcp: fix under-accounting retransmit SNMP counters

This patch fixes these under-accounting SNMP rtx stats
LINUX_MIB_TCPFORWARDRETRANS
LINUX_MIB_TCPFASTRETRANS
LINUX_MIB_TCPSLOWSTARTRETRANS
when retransmitting TSO packets

Fixes: 10d3be569243 ("tcp-tso: do not split TSO packets at retransmit time")
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index f53d0cc..e15ec82 100644 (file)
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2831,7 +2831,7 @@ begin_fwd:
                if (tcp_retransmit_skb(sk, skb, segs))
                        return;
 
-               NET_INC_STATS(sock_net(sk), mib_idx);
+               NET_ADD_STATS(sock_net(sk), mib_idx, tcp_skb_pcount(skb));
 
                if (tcp_in_cwnd_reduction(sk))
                        tp->prr_out += tcp_skb_pcount(skb);