Justin Pettit
1400bbb7eb
To report on link status and whether a port is administratively enabled or disabled, the reference switches poll. This change uses the Linux kernel's device notification system, so that polling isn't necessary.
64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
/*
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* Distributed under the terms of the GNU GPL version 2.
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* Copyright (c) 2007, 2008 The Board of Trustees of The Leland
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* Stanford Junior University
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*/
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/* Handle changes to managed devices */
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#include <linux/netdevice.h>
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#include "datapath.h"
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static int dp_device_event(struct notifier_block *unused, unsigned long event,
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void *ptr)
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{
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struct net_device *dev = ptr;
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struct net_bridge_port *p = dev->br_port;
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unsigned long int flags;
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uint32_t orig_status;
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/* Check if monitored port */
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if (!p)
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return NOTIFY_DONE;
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spin_lock_irqsave(&p->lock, flags);
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orig_status = p->status;
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switch (event) {
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case NETDEV_CHANGE:
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if (netif_carrier_ok(p->dev))
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p->status &= ~OFPPFL_LINK_DOWN;
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else
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p->status |= OFPPFL_LINK_DOWN;
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break;
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case NETDEV_DOWN:
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p->status |= OFPPFL_PORT_DOWN;
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break;
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case NETDEV_UP:
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p->status &= ~OFPPFL_PORT_DOWN;
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break;
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case NETDEV_UNREGISTER:
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/* xxx Make sure this is correct */
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spin_unlock_irqrestore(&p->lock, flags);
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dp_del_switch_port(p);
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return NOTIFY_DONE;
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break;
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}
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spin_unlock_irqrestore(&p->lock, flags);
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if (orig_status != p->status)
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dp_send_port_status(p, OFPPR_MOD);
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return NOTIFY_DONE;
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}
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struct notifier_block dp_device_notifier = {
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.notifier_call = dp_device_event
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};
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