Release 4.15 net/decnet/dn_timer.c

// SPDX-License-Identifier: GPL-2.0
/*
 * 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 <SteveW@ACM.org>
 *
 *
 * 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 <linux/net.h>
#include <linux/socket.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/timer.h>
#include <linux/spinlock.h>
#include <net/sock.h>
#include <linux/atomic.h>
#include <linux/jiffies.h>
#include <net/flow.h>
#include <net/dn.h>

/*
 * Slow timer is for everything else (n * 500mS)
 */


#define SLOW_INTERVAL (HZ/2)

static void dn_slow_timer(struct timer_list *t);



void dn_start_slow_timer(struct sock *sk)
{
	timer_setup(&sk->sk_timer, dn_slow_timer, 0);
	sk_reset_timer(sk, &sk->sk_timer, jiffies + SLOW_INTERVAL);
}

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Linus Torvalds (pre-git)
20
55.56%
1
25.00%
Eric Dumazet
12
33.33%
1
25.00%
Arnaldo Carvalho de Melo
2
5.56%
1
25.00%
Kees Cook
2
5.56%
1
25.00%
Total
36
100.00%
4
100.00%



void dn_stop_slow_timer(struct sock *sk)
{
	sk_stop_timer(sk, &sk->sk_timer);
}

Contributors
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Tokens
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Linus Torvalds (pre-git)
16
80.00%
1
33.33%
Eric Dumazet
3
15.00%
1
33.33%
Arnaldo Carvalho de Melo
1
5.00%
1
33.33%
Total
20
100.00%
3
100.00%



static void dn_slow_timer(struct timer_list *t)
{
	struct sock *sk = from_timer(sk, t, sk_timer);
	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);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
150
80.21%
3
33.33%
Eric Dumazet
12
6.42%
1
11.11%
Kees Cook
12
6.42%
1
11.11%
Himangi Saraogi
5
2.67%
1
11.11%
Benjamin LaHaise
3
1.60%
1
11.11%
Linus Torvalds
3
1.60%
1
11.11%
Arnaldo Carvalho de Melo
2
1.07%
1
11.11%
Total
187
100.00%
9
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
223
76.11%
4
28.57%
Eric Dumazet
27
9.22%
1
7.14%
Kees Cook
18
6.14%
1
7.14%
Himangi Saraogi
8
2.73%
1
7.14%
Arnaldo Carvalho de Melo
5
1.71%
1
7.14%
Linus Torvalds
3
1.02%
1
7.14%
Steven Whitehouse
3
1.02%
1
7.14%
Benjamin LaHaise
3
1.02%
1
7.14%
Adrian Bunk
1
0.34%
1
7.14%
Arun Sharma
1
0.34%
1
7.14%
Greg Kroah-Hartman
1
0.34%
1
7.14%
Total
293
100.00%
14
100.00%
Directory: net/decnet

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