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[/] [test_project/] [trunk/] [linux_sd_driver/] [net/] [rose/] [rose_timer.c] - Blame information for rev 62

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Line No. Rev Author Line
1 62 marcus.erl 
/*
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
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 * Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
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 */
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/kernel.h>
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#include <linux/jiffies.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <net/ax25.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/tcp_states.h>
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#include <asm/system.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <net/rose.h>
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static void rose_heartbeat_expiry(unsigned long);
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static void rose_timer_expiry(unsigned long);
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static void rose_idletimer_expiry(unsigned long);
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void rose_start_heartbeat(struct sock *sk)
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{
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        del_timer(&sk->sk_timer);
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        sk->sk_timer.data     = (unsigned long)sk;
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        sk->sk_timer.function = &rose_heartbeat_expiry;
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        sk->sk_timer.expires  = jiffies + 5 * HZ;
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        add_timer(&sk->sk_timer);
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}
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void rose_start_t1timer(struct sock *sk)
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{
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        struct rose_sock *rose = rose_sk(sk);
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        del_timer(&rose->timer);
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        rose->timer.data     = (unsigned long)sk;
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        rose->timer.function = &rose_timer_expiry;
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        rose->timer.expires  = jiffies + rose->t1;
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        add_timer(&rose->timer);
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}
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void rose_start_t2timer(struct sock *sk)
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{
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        struct rose_sock *rose = rose_sk(sk);
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        del_timer(&rose->timer);
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        rose->timer.data     = (unsigned long)sk;
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        rose->timer.function = &rose_timer_expiry;
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        rose->timer.expires  = jiffies + rose->t2;
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        add_timer(&rose->timer);
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}
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void rose_start_t3timer(struct sock *sk)
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{
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        struct rose_sock *rose = rose_sk(sk);
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        del_timer(&rose->timer);
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        rose->timer.data     = (unsigned long)sk;
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        rose->timer.function = &rose_timer_expiry;
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        rose->timer.expires  = jiffies + rose->t3;
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        add_timer(&rose->timer);
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}
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void rose_start_hbtimer(struct sock *sk)
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{
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        struct rose_sock *rose = rose_sk(sk);
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        del_timer(&rose->timer);
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        rose->timer.data     = (unsigned long)sk;
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        rose->timer.function = &rose_timer_expiry;
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        rose->timer.expires  = jiffies + rose->hb;
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        add_timer(&rose->timer);
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}
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void rose_start_idletimer(struct sock *sk)
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{
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        struct rose_sock *rose = rose_sk(sk);
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        del_timer(&rose->idletimer);
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        if (rose->idle > 0) {
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                rose->idletimer.data     = (unsigned long)sk;
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                rose->idletimer.function = &rose_idletimer_expiry;
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                rose->idletimer.expires  = jiffies + rose->idle;
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                add_timer(&rose->idletimer);
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        }
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}
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void rose_stop_heartbeat(struct sock *sk)
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{
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        del_timer(&sk->sk_timer);
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}
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void rose_stop_timer(struct sock *sk)
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{
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        del_timer(&rose_sk(sk)->timer);
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}
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void rose_stop_idletimer(struct sock *sk)
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{
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        del_timer(&rose_sk(sk)->idletimer);
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}
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static void rose_heartbeat_expiry(unsigned long param)
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{
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        struct sock *sk = (struct sock *)param;
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        struct rose_sock *rose = rose_sk(sk);
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        bh_lock_sock(sk);
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        switch (rose->state) {
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        case ROSE_STATE_0:
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                /* Magic here: If we listen() and a new link dies before it
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                   is accepted() it isn't 'dead' so doesn't get removed. */
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                if (sock_flag(sk, SOCK_DESTROY) ||
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                    (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
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                        bh_unlock_sock(sk);
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                        rose_destroy_socket(sk);
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                        return;
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                }
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                break;
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        case ROSE_STATE_3:
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                /*
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                 * Check for the state of the receive buffer.
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                 */
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                if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
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                    (rose->condition & ROSE_COND_OWN_RX_BUSY)) {
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                        rose->condition &= ~ROSE_COND_OWN_RX_BUSY;
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                        rose->condition &= ~ROSE_COND_ACK_PENDING;
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                        rose->vl         = rose->vr;
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                        rose_write_internal(sk, ROSE_RR);
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                        rose_stop_timer(sk);    /* HB */
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                        break;
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                }
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                break;
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        }
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        rose_start_heartbeat(sk);
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        bh_unlock_sock(sk);
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}
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static void rose_timer_expiry(unsigned long param)
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{
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        struct sock *sk = (struct sock *)param;
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        struct rose_sock *rose = rose_sk(sk);
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        bh_lock_sock(sk);
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        switch (rose->state) {
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        case ROSE_STATE_1:      /* T1 */
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        case ROSE_STATE_4:      /* T2 */
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                rose_write_internal(sk, ROSE_CLEAR_REQUEST);
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                rose->state = ROSE_STATE_2;
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                rose_start_t3timer(sk);
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                break;
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        case ROSE_STATE_2:      /* T3 */
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                rose->neighbour->use--;
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                rose_disconnect(sk, ETIMEDOUT, -1, -1);
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                break;
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        case ROSE_STATE_3:      /* HB */
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                if (rose->condition & ROSE_COND_ACK_PENDING) {
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                        rose->condition &= ~ROSE_COND_ACK_PENDING;
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                        rose_enquiry_response(sk);
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                }
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                break;
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        }
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        bh_unlock_sock(sk);
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}
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static void rose_idletimer_expiry(unsigned long param)
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{
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        struct sock *sk = (struct sock *)param;
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        bh_lock_sock(sk);
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        rose_clear_queues(sk);
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        rose_write_internal(sk, ROSE_CLEAR_REQUEST);
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        rose_sk(sk)->state = ROSE_STATE_2;
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206 
        rose_start_t3timer(sk);
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        sk->sk_state     = TCP_CLOSE;
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        sk->sk_err       = 0;
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        sk->sk_shutdown |= SEND_SHUTDOWN;
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212 
        if (!sock_flag(sk, SOCK_DEAD)) {
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                sk->sk_state_change(sk);
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                sock_set_flag(sk, SOCK_DEAD);
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        }
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        bh_unlock_sock(sk);
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}

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