tcp: Refactor pingpong code

Instead of using pingpong as a single bit information, we refactor the
code to treat it as a counter. When interactive session is detected,
we set pingpong count to TCP_PINGPONG_THRESH. And when pingpong count
is >= TCP_PINGPONG_THRESH, we consider the session in pingpong mode.

This patch is a pure refactor and sets foundation for the next patch.
This patch itself does not change any pingpong logic.

Signed-off-by: Wei Wang <weiwan@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index efc6fef692ff..662b034f1795 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2437,7 +2437,7 @@ static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i)
                 refcount_read(&sk->sk_refcnt), sk,
                 jiffies_to_clock_t(icsk->icsk_rto),
                 jiffies_to_clock_t(icsk->icsk_ack.ato),
-                (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong,
+                (icsk->icsk_ack.quick << 1) | inet_csk_in_pingpong_mode(sk),
                 tp->snd_cwnd,
                 state == TCP_LISTEN ?
                     fastopenq->max_qlen :