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Date: Fri, 25 Jan 2019 10:53:19 -0800
From: Wei Wang <weiwan@...gle.com>
To: David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Cc: Yuchung Cheng <ycheng@...gle.com>,
Neal Cardwell <ncardwell@...gle.com>,
Eric Dumazet <edumazet@...gle.com>,
Wei Wang <weiwan@...gle.com>
Subject: [PATCH net-next 1/2] 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@...gle.com>
Signed-off-by: Yuchung Cheng <ycheng@...gle.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
include/net/inet_connection_sock.h | 17 +++++++++++++++++
net/dccp/input.c | 2 +-
net/dccp/timer.c | 4 ++--
net/ipv4/tcp.c | 10 +++++-----
net/ipv4/tcp_input.c | 8 ++++----
net/ipv4/tcp_ipv4.c | 2 +-
net/ipv4/tcp_output.c | 4 ++--
net/ipv4/tcp_timer.c | 4 ++--
net/ipv6/tcp_ipv6.c | 2 +-
9 files changed, 35 insertions(+), 18 deletions(-)
diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
index 371b3b45fd5c..5c9fa6b72c5a 100644
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -314,4 +314,21 @@ int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
char __user *optval, unsigned int optlen);
struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu);
+
+#define TCP_PINGPONG_THRESH 1
+
+static inline void inet_csk_enter_pingpong_mode(struct sock *sk)
+{
+ inet_csk(sk)->icsk_ack.pingpong = TCP_PINGPONG_THRESH;
+}
+
+static inline void inet_csk_exit_pingpong_mode(struct sock *sk)
+{
+ inet_csk(sk)->icsk_ack.pingpong = 0;
+}
+
+static inline bool inet_csk_in_pingpong_mode(struct sock *sk)
+{
+ return inet_csk(sk)->icsk_ack.pingpong >= TCP_PINGPONG_THRESH;
+}
#endif /* _INET_CONNECTION_SOCK_H */
diff --git a/net/dccp/input.c b/net/dccp/input.c
index 85d6c879383d..8d03707abdac 100644
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -480,7 +480,7 @@ static int dccp_rcv_request_sent_state_process(struct sock *sk,
sk_wake_async(sk, SOCK_WAKE_IO, POLL_OUT);
}
- if (sk->sk_write_pending || icsk->icsk_ack.pingpong ||
+ if (sk->sk_write_pending || inet_csk_in_pingpong_mode(sk) ||
icsk->icsk_accept_queue.rskq_defer_accept) {
/* Save one ACK. Data will be ready after
* several ticks, if write_pending is set.
diff --git a/net/dccp/timer.c b/net/dccp/timer.c
index 1501a20a94ca..74e138495d67 100644
--- a/net/dccp/timer.c
+++ b/net/dccp/timer.c
@@ -199,7 +199,7 @@ static void dccp_delack_timer(struct timer_list *t)
icsk->icsk_ack.pending &= ~ICSK_ACK_TIMER;
if (inet_csk_ack_scheduled(sk)) {
- if (!icsk->icsk_ack.pingpong) {
+ if (!inet_csk_in_pingpong_mode(sk)) {
/* Delayed ACK missed: inflate ATO. */
icsk->icsk_ack.ato = min(icsk->icsk_ack.ato << 1,
icsk->icsk_rto);
@@ -207,7 +207,7 @@ static void dccp_delack_timer(struct timer_list *t)
/* Delayed ACK missed: leave pingpong mode and
* deflate ATO.
*/
- icsk->icsk_ack.pingpong = 0;
+ inet_csk_exit_pingpong_mode(sk);
icsk->icsk_ack.ato = TCP_ATO_MIN;
}
dccp_send_ack(sk);
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 541bdb9f81d7..800ec37b24ce 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1554,7 +1554,7 @@ static void tcp_cleanup_rbuf(struct sock *sk, int copied)
(copied > 0 &&
((icsk->icsk_ack.pending & ICSK_ACK_PUSHED2) ||
((icsk->icsk_ack.pending & ICSK_ACK_PUSHED) &&
- !icsk->icsk_ack.pingpong)) &&
+ !inet_csk_in_pingpong_mode(sk))) &&
!atomic_read(&sk->sk_rmem_alloc)))
time_to_ack = true;
}
@@ -2987,16 +2987,16 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
case TCP_QUICKACK:
if (!val) {
- icsk->icsk_ack.pingpong = 1;
+ inet_csk_enter_pingpong_mode(sk);
} else {
- icsk->icsk_ack.pingpong = 0;
+ inet_csk_exit_pingpong_mode(sk);
if ((1 << sk->sk_state) &
(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT) &&
inet_csk_ack_scheduled(sk)) {
icsk->icsk_ack.pending |= ICSK_ACK_PUSHED;
tcp_cleanup_rbuf(sk, 1);
if (!(val & 1))
- icsk->icsk_ack.pingpong = 1;
+ inet_csk_enter_pingpong_mode(sk);
}
}
break;
@@ -3410,7 +3410,7 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
return 0;
}
case TCP_QUICKACK:
- val = !icsk->icsk_ack.pingpong;
+ val = !inet_csk_in_pingpong_mode(sk);
break;
case TCP_CONGESTION:
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 76858b14ebe9..7a027dec649b 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -221,7 +221,7 @@ void tcp_enter_quickack_mode(struct sock *sk, unsigned int max_quickacks)
struct inet_connection_sock *icsk = inet_csk(sk);
tcp_incr_quickack(sk, max_quickacks);
- icsk->icsk_ack.pingpong = 0;
+ inet_csk_exit_pingpong_mode(sk);
icsk->icsk_ack.ato = TCP_ATO_MIN;
}
EXPORT_SYMBOL(tcp_enter_quickack_mode);
@@ -236,7 +236,7 @@ static bool tcp_in_quickack_mode(struct sock *sk)
const struct dst_entry *dst = __sk_dst_get(sk);
return (dst && dst_metric(dst, RTAX_QUICKACK)) ||
- (icsk->icsk_ack.quick && !icsk->icsk_ack.pingpong);
+ (icsk->icsk_ack.quick && !inet_csk_in_pingpong_mode(sk));
}
static void tcp_ecn_queue_cwr(struct tcp_sock *tp)
@@ -4094,7 +4094,7 @@ void tcp_fin(struct sock *sk)
case TCP_ESTABLISHED:
/* Move to CLOSE_WAIT */
tcp_set_state(sk, TCP_CLOSE_WAIT);
- inet_csk(sk)->icsk_ack.pingpong = 1;
+ inet_csk_enter_pingpong_mode(sk);
break;
case TCP_CLOSE_WAIT:
@@ -5889,7 +5889,7 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
return -1;
if (sk->sk_write_pending ||
icsk->icsk_accept_queue.rskq_defer_accept ||
- icsk->icsk_ack.pingpong) {
+ inet_csk_in_pingpong_mode(sk)) {
/* Save one ACK. Data will be ready after
* several ticks, if write_pending is set.
*
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 :
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 6527f61f59ff..130e43b31210 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -171,7 +171,7 @@ static void tcp_event_data_sent(struct tcp_sock *tp,
* packet, enter pingpong mode.
*/
if ((u32)(now - icsk->icsk_ack.lrcvtime) < icsk->icsk_ack.ato)
- icsk->icsk_ack.pingpong = 1;
+ inet_csk_enter_pingpong_mode(sk);
}
/* Account for an ACK we sent. */
@@ -3568,7 +3568,7 @@ void tcp_send_delayed_ack(struct sock *sk)
const struct tcp_sock *tp = tcp_sk(sk);
int max_ato = HZ / 2;
- if (icsk->icsk_ack.pingpong ||
+ if (inet_csk_in_pingpong_mode(sk) ||
(icsk->icsk_ack.pending & ICSK_ACK_PUSHED))
max_ato = TCP_DELACK_MAX;
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index d7399a89469d..f0c86398e6a7 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -277,14 +277,14 @@ void tcp_delack_timer_handler(struct sock *sk)
icsk->icsk_ack.pending &= ~ICSK_ACK_TIMER;
if (inet_csk_ack_scheduled(sk)) {
- if (!icsk->icsk_ack.pingpong) {
+ if (!inet_csk_in_pingpong_mode(sk)) {
/* Delayed ACK missed: inflate ATO. */
icsk->icsk_ack.ato = min(icsk->icsk_ack.ato << 1, icsk->icsk_rto);
} else {
/* Delayed ACK missed: leave pingpong mode and
* deflate ATO.
*/
- icsk->icsk_ack.pingpong = 0;
+ inet_csk_exit_pingpong_mode(sk);
icsk->icsk_ack.ato = TCP_ATO_MIN;
}
tcp_mstamp_refresh(tcp_sk(sk));
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index b81eb7cb815e..e51cda79f0cc 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1864,7 +1864,7 @@ static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
refcount_read(&sp->sk_refcnt), sp,
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(sp),
tp->snd_cwnd,
state == TCP_LISTEN ?
fastopenq->max_qlen :
--
2.20.1.321.g9e740568ce-goog
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