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tcp: Refactor pingpong code

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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>
This commit is contained in:
Wei Wang
2019-01-25 10:53:19 -08:00
committed by David S. Miller
parent fb1b699991
commit 31954cd8bb
9 changed files with 35 additions and 18 deletions
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17
include/net/inet_connection_sock.h
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@@ -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 */