From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/net/decnet/dn_timer.c | 103 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 103 insertions(+) create mode 100644 kernel/net/decnet/dn_timer.c (limited to 'kernel/net/decnet/dn_timer.c') diff --git a/kernel/net/decnet/dn_timer.c b/kernel/net/decnet/dn_timer.c new file mode 100644 index 000000000..1d330fd43 --- /dev/null +++ b/kernel/net/decnet/dn_timer.c @@ -0,0 +1,103 @@ +/* + * DECnet An implementation of the DECnet protocol suite for the LINUX + * operating system. DECnet is implemented using the BSD Socket + * interface as the means of communication with the user level. + * + * DECnet Socket Timer Functions + * + * Author: Steve Whitehouse + * + * + * Changes: + * Steve Whitehouse : Made keepalive timer part of the same + * timer idea. + * Steve Whitehouse : Added checks for sk->sock_readers + * David S. Miller : New socket locking + * Steve Whitehouse : Timer grabs socket ref. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * Slow timer is for everything else (n * 500mS) + */ + +#define SLOW_INTERVAL (HZ/2) + +static void dn_slow_timer(unsigned long arg); + +void dn_start_slow_timer(struct sock *sk) +{ + setup_timer(&sk->sk_timer, dn_slow_timer, (unsigned long)sk); + sk_reset_timer(sk, &sk->sk_timer, jiffies + SLOW_INTERVAL); +} + +void dn_stop_slow_timer(struct sock *sk) +{ + sk_stop_timer(sk, &sk->sk_timer); +} + +static void dn_slow_timer(unsigned long arg) +{ + struct sock *sk = (struct sock *)arg; + struct dn_scp *scp = DN_SK(sk); + + bh_lock_sock(sk); + + if (sock_owned_by_user(sk)) { + sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 10); + goto out; + } + + /* + * The persist timer is the standard slow timer used for retransmits + * in both connection establishment and disconnection as well as + * in the RUN state. The different states are catered for by changing + * the function pointer in the socket. Setting the timer to a value + * of zero turns it off. We allow the persist_fxn to turn the + * timer off in a permant way by returning non-zero, so that + * timer based routines may remove sockets. This is why we have a + * sock_hold()/sock_put() around the timer to prevent the socket + * going away in the middle. + */ + if (scp->persist && scp->persist_fxn) { + if (scp->persist <= SLOW_INTERVAL) { + scp->persist = 0; + + if (scp->persist_fxn(sk)) + goto out; + } else { + scp->persist -= SLOW_INTERVAL; + } + } + + /* + * Check for keepalive timeout. After the other timer 'cos if + * the previous timer caused a retransmit, we don't need to + * do this. scp->stamp is the last time that we sent a packet. + * The keepalive function sends a link service packet to the + * other end. If it remains unacknowledged, the standard + * socket timers will eventually shut the socket down. Each + * time we do this, scp->stamp will be updated, thus + * we won't try and send another until scp->keepalive has passed + * since the last successful transmission. + */ + if (scp->keepalive && scp->keepalive_fxn && (scp->state == DN_RUN)) { + if (time_after_eq(jiffies, scp->stamp + scp->keepalive)) + scp->keepalive_fxn(sk); + } + + sk_reset_timer(sk, &sk->sk_timer, jiffies + SLOW_INTERVAL); +out: + bh_unlock_sock(sk); + sock_put(sk); +} -- cgit 1.2.3-korg