Revert "tcp: change pingpong threshold to 3"

This reverts commit 4a41f453bedfd5e9cd040bad509d9da49feb3e2c.

This to-be-reverted commit was meant to apply a stricter rule for the
stack to enter pingpong mode. However, the condition used to check for
interactive session "before(tp->lsndtime, icsk->icsk_ack.lrcvtime)" is
jiffy based and might be too coarse, which delays the stack entering
pingpong mode.
We revert this patch so that we no longer use the above condition to
determine interactive session, and also reduce pingpong threshold to 1.

Fixes: 4a41f453bedf ("tcp: change pingpong threshold to 3")
Reported-by: LemmyHuang <hlm3280@163.com>
Suggested-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Wei Wang <weiwan@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20220721204404.388396-1-weiwan@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
index 85cd695e7fd1d37cc59ac471c873d72517a40638..ee88f0f1350f4e1d8a9c3daea7c7bf8310b2fa62 100644 (file)
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -321,7 +321,7 @@ void inet_csk_update_fastreuse(struct inet_bind_bucket *tb,
 
 struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu);
 
-#define TCP_PINGPONG_THRESH    3
+#define TCP_PINGPONG_THRESH    1
 
 static inline void inet_csk_enter_pingpong_mode(struct sock *sk)
 {
@@ -338,14 +338,6 @@ static inline bool inet_csk_in_pingpong_mode(struct sock *sk)
        return inet_csk(sk)->icsk_ack.pingpong >= TCP_PINGPONG_THRESH;
 }
 
-static inline void inet_csk_inc_pingpong_cnt(struct sock *sk)
-{
-       struct inet_connection_sock *icsk = inet_csk(sk);
-
-       if (icsk->icsk_ack.pingpong < U8_MAX)
-               icsk->icsk_ack.pingpong++;
-}
-
 static inline bool inet_csk_has_ulp(struct sock *sk)
 {
        return inet_sk(sk)->is_icsk && !!inet_csk(sk)->icsk_ulp_ops;

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index cf6713c9567e14feab0c7f7b908f6653b6e19672..2efe41c84ee8a3963cc6f854f3603a7649c226a8 100644 (file)
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -167,16 +167,13 @@ static void tcp_event_data_sent(struct tcp_sock *tp,
        if (tcp_packets_in_flight(tp) == 0)
                tcp_ca_event(sk, CA_EVENT_TX_START);
 
-       /* If this is the first data packet sent in response to the
-        * previous received data,
-        * and it is a reply for ato after last received packet,
-        * increase pingpong count.
-        */
-       if (before(tp->lsndtime, icsk->icsk_ack.lrcvtime) &&
-           (u32)(now - icsk->icsk_ack.lrcvtime) < icsk->icsk_ack.ato)
-               inet_csk_inc_pingpong_cnt(sk);
-
        tp->lsndtime = now;
+
+       /* If it is a reply for ato after last received
+        * packet, enter pingpong mode.
+        */
+       if ((u32)(now - icsk->icsk_ack.lrcvtime) < icsk->icsk_ack.ato)
+               inet_csk_enter_pingpong_mode(sk);
 }
 
 /* Account for an ACK we sent. */