tcp: increment retransmit counters in tlp and fast open

Both TLP and Fast Open call __tcp_retransmit_skb() instead of
tcp_retransmit_skb() to avoid changing tp->retrans_out.

This has the side effect of missing SNMP counters increments as well
as tcp_info tcpi_total_retrans updates.

Fix this by moving the stats increments of into __tcp_retransmit_skb()

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Nandita Dukkipati <nanditad@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 7 deletions

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 025e25093984..12d6016bdd9a 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2441,8 +2441,14 @@ int __tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
                 err = tcp_transmit_skb(sk, skb, 1, GFP_ATOMIC);
         }
 
-        if (likely(!err))
+        if (likely(!err)) {
                 TCP_SKB_CB(skb)->sacked |= TCPCB_EVER_RETRANS;
+                /* Update global TCP statistics. */
+                TCP_INC_STATS(sock_net(sk), TCP_MIB_RETRANSSEGS);
+                if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN)
+                        NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPSYNRETRANS);
+                tp->total_retrans++;
+        }
         return err;
 }
 
@@ -2452,12 +2458,6 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
         int err = __tcp_retransmit_skb(sk, skb);
 
         if (err == 0) {
-                /* Update global TCP statistics. */
-                TCP_INC_STATS(sock_net(sk), TCP_MIB_RETRANSSEGS);
-                if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN)
-                        NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPSYNRETRANS);
-                tp->total_retrans++;
-
 #if FASTRETRANS_DEBUG > 0
                 if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS) {
                         net_dbg_ratelimited("retrans_out leaked\n");