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tcp: keepalive cleanups 

Introduce keepalive_probes(tp) helper, and use it, like 
keepalive_time_when(tp) and keepalive_intvl_when(tp)

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2009-08-28 23:48:54 -07:00 committed by David S. Miller
parent 5e9b2dbfcb
commit df19a62677
3 changed files with 9 additions and 5 deletions
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5
include/net/tcp.h
View File

@ -1007,6 +1007,11 @@ static inline int keepalive_time_when(const struct tcp_sock *tp)
return tp->keepalive_time ? : sysctl_tcp_keepalive_time;
}
static inline int keepalive_probes(const struct tcp_sock *tp)
{
return tp->keepalive_probes ? : sysctl_tcp_keepalive_probes;
}
static inline int tcp_fin_time(const struct sock *sk)
{
int fin_timeout = tcp_sk(sk)->linger2 ? : sysctl_tcp_fin_timeout;

6
net/ipv4/tcp.c
View File

@ -2336,13 +2336,13 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
val = !!(tp->nonagle&TCP_NAGLE_CORK);
break;
case TCP_KEEPIDLE:
val = (tp->keepalive_time ? : sysctl_tcp_keepalive_time) / HZ;
val = keepalive_time_when(tp) / HZ;
break;
case TCP_KEEPINTVL:
val = (tp->keepalive_intvl ? : sysctl_tcp_keepalive_intvl) / HZ;
val = keepalive_intvl_when(tp) / HZ;
break;
case TCP_KEEPCNT:
val = tp->keepalive_probes ? : sysctl_tcp_keepalive_probes;
val = keepalive_probes(tp);
break;
case TCP_SYNCNT:
val = icsk->icsk_syn_retries ? : sysctl_tcp_syn_retries;

3
net/ipv4/tcp_timer.c
View File

@ -499,8 +499,7 @@ static void tcp_keepalive_timer (unsigned long data)
elapsed = tcp_time_stamp - tp->rcv_tstamp;
if (elapsed >= keepalive_time_when(tp)) {
if ((!tp->keepalive_probes && icsk->icsk_probes_out >= sysctl_tcp_keepalive_probes) ||
(tp->keepalive_probes && icsk->icsk_probes_out >= tp->keepalive_probes)) {
if (icsk->icsk_probes_out >= keepalive_probes(tp)) {
tcp_send_active_reset(sk, GFP_ATOMIC);
tcp_write_err(sk);
goto out;