diff options
| author | David S. Miller <davem@davemloft.net> | 2019-01-27 13:29:43 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-01-27 13:29:43 -0800 |
| commit | 889865cf54bddd8a4e258a11225bcbb646f90863 (patch) | |
| tree | f0afde54fb516f0293e849ade6c738ece48f16c1 /include | |
| parent | fb1b69999130e9800c4e341a2b0f0991cdd8fcfc (diff) | |
| parent | 4a41f453bedfd5e9cd040bad509d9da49feb3e2c (diff) | |
Merge branch 'tcp-change-pingpong-to-3-in-delayed-ack-logic'
Wei Wang says:
====================
tcp: change pingpong to 3 in delayed ack logic
TCP receiver today tries not to delay the ACKs to speed up the initial
slow start (a.k.a QUICK ACK mechanism). However the previous design
does not work well with modern TCP applications that starts with an
application-level handshake. For example, a HTTPs server often
receives the SSL hello and responds right away which triggers the TCP
stack to stop the quick ack and start delaying the ACKs based only one
instance of ping-pong. This patchset changes the threshold from 1 to 3
ping-pong transactions, so that we only start to delay the acks after
the receiver responds data quickly three times.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/inet_connection_sock.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h index fe0d9b44d6fc..ff40e1d08157 100644 --- a/include/net/inet_connection_sock.h +++ b/include/net/inet_connection_sock.h @@ -314,4 +314,29 @@ 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 3 + +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; +} + +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++; +} #endif /* _INET_CONNECTION_SOCK_H */ |