mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
3ff50b7997
Spring cleaning time... There seems to be a lot of places in the network code that have extra bogus semicolons after conditionals. Most commonly is a bogus semicolon after: switch() { } Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
182 lines
3.9 KiB
C
182 lines
3.9 KiB
C
/*
|
|
* Linux network device link state notification
|
|
*
|
|
* Author:
|
|
* Stefan Rompf <sux@loplof.de>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/if.h>
|
|
#include <net/sock.h>
|
|
#include <net/pkt_sched.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/list.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/bitops.h>
|
|
#include <asm/types.h>
|
|
|
|
|
|
enum lw_bits {
|
|
LW_RUNNING = 0,
|
|
LW_SE_USED
|
|
};
|
|
|
|
static unsigned long linkwatch_flags;
|
|
static unsigned long linkwatch_nextevent;
|
|
|
|
static void linkwatch_event(struct work_struct *dummy);
|
|
static DECLARE_DELAYED_WORK(linkwatch_work, linkwatch_event);
|
|
|
|
static LIST_HEAD(lweventlist);
|
|
static DEFINE_SPINLOCK(lweventlist_lock);
|
|
|
|
struct lw_event {
|
|
struct list_head list;
|
|
struct net_device *dev;
|
|
};
|
|
|
|
/* Avoid kmalloc() for most systems */
|
|
static struct lw_event singleevent;
|
|
|
|
static unsigned char default_operstate(const struct net_device *dev)
|
|
{
|
|
if (!netif_carrier_ok(dev))
|
|
return (dev->ifindex != dev->iflink ?
|
|
IF_OPER_LOWERLAYERDOWN : IF_OPER_DOWN);
|
|
|
|
if (netif_dormant(dev))
|
|
return IF_OPER_DORMANT;
|
|
|
|
return IF_OPER_UP;
|
|
}
|
|
|
|
|
|
static void rfc2863_policy(struct net_device *dev)
|
|
{
|
|
unsigned char operstate = default_operstate(dev);
|
|
|
|
if (operstate == dev->operstate)
|
|
return;
|
|
|
|
write_lock_bh(&dev_base_lock);
|
|
|
|
switch(dev->link_mode) {
|
|
case IF_LINK_MODE_DORMANT:
|
|
if (operstate == IF_OPER_UP)
|
|
operstate = IF_OPER_DORMANT;
|
|
break;
|
|
|
|
case IF_LINK_MODE_DEFAULT:
|
|
default:
|
|
break;
|
|
}
|
|
|
|
dev->operstate = operstate;
|
|
|
|
write_unlock_bh(&dev_base_lock);
|
|
}
|
|
|
|
|
|
/* Must be called with the rtnl semaphore held */
|
|
void linkwatch_run_queue(void)
|
|
{
|
|
struct list_head head, *n, *next;
|
|
|
|
spin_lock_irq(&lweventlist_lock);
|
|
list_replace_init(&lweventlist, &head);
|
|
spin_unlock_irq(&lweventlist_lock);
|
|
|
|
list_for_each_safe(n, next, &head) {
|
|
struct lw_event *event = list_entry(n, struct lw_event, list);
|
|
struct net_device *dev = event->dev;
|
|
|
|
if (event == &singleevent) {
|
|
clear_bit(LW_SE_USED, &linkwatch_flags);
|
|
} else {
|
|
kfree(event);
|
|
}
|
|
|
|
/* We are about to handle this device,
|
|
* so new events can be accepted
|
|
*/
|
|
clear_bit(__LINK_STATE_LINKWATCH_PENDING, &dev->state);
|
|
|
|
rfc2863_policy(dev);
|
|
if (dev->flags & IFF_UP) {
|
|
if (netif_carrier_ok(dev)) {
|
|
WARN_ON(dev->qdisc_sleeping == &noop_qdisc);
|
|
dev_activate(dev);
|
|
} else
|
|
dev_deactivate(dev);
|
|
|
|
netdev_state_change(dev);
|
|
}
|
|
|
|
dev_put(dev);
|
|
}
|
|
}
|
|
|
|
|
|
static void linkwatch_event(struct work_struct *dummy)
|
|
{
|
|
/* Limit the number of linkwatch events to one
|
|
* per second so that a runaway driver does not
|
|
* cause a storm of messages on the netlink
|
|
* socket
|
|
*/
|
|
linkwatch_nextevent = jiffies + HZ;
|
|
clear_bit(LW_RUNNING, &linkwatch_flags);
|
|
|
|
rtnl_lock();
|
|
linkwatch_run_queue();
|
|
rtnl_unlock();
|
|
}
|
|
|
|
|
|
void linkwatch_fire_event(struct net_device *dev)
|
|
{
|
|
if (!test_and_set_bit(__LINK_STATE_LINKWATCH_PENDING, &dev->state)) {
|
|
unsigned long flags;
|
|
struct lw_event *event;
|
|
|
|
if (test_and_set_bit(LW_SE_USED, &linkwatch_flags)) {
|
|
event = kmalloc(sizeof(struct lw_event), GFP_ATOMIC);
|
|
|
|
if (unlikely(event == NULL)) {
|
|
clear_bit(__LINK_STATE_LINKWATCH_PENDING, &dev->state);
|
|
return;
|
|
}
|
|
} else {
|
|
event = &singleevent;
|
|
}
|
|
|
|
dev_hold(dev);
|
|
event->dev = dev;
|
|
|
|
spin_lock_irqsave(&lweventlist_lock, flags);
|
|
list_add_tail(&event->list, &lweventlist);
|
|
spin_unlock_irqrestore(&lweventlist_lock, flags);
|
|
|
|
if (!test_and_set_bit(LW_RUNNING, &linkwatch_flags)) {
|
|
unsigned long delay = linkwatch_nextevent - jiffies;
|
|
|
|
/* If we wrap around we'll delay it by at most HZ. */
|
|
if (delay > HZ)
|
|
delay = 0;
|
|
schedule_delayed_work(&linkwatch_work, delay);
|
|
}
|
|
}
|
|
}
|
|
|
|
EXPORT_SYMBOL(linkwatch_fire_event);
|