linux/net/core/failover.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2018, Intel Corporation. */

/* A common module to handle registrations and notifications for paravirtual
 * drivers to enable accelerated datapath and support VF live migration.
 *
 * The notifier and event handling code is based on netvsc driver.
 */

#include <linux/module.h>
#include <linux/etherdevice.h>
#include <uapi/linux/if_arp.h>
#include <linux/rtnetlink.h>
#include <linux/if_vlan.h>
#include <net/failover.h>

static LIST_HEAD(failover_list);
static DEFINE_SPINLOCK(failover_lock);

static struct net_device *failover_get_bymac(u8 *mac, struct failover_ops **ops)
{ … }

/**
 * failover_slave_register - Register a slave netdev
 *
 * @slave_dev: slave netdev that is being registered
 *
 * Registers a slave device to a failover instance. Only ethernet devices
 * are supported.
 */
static int failover_slave_register(struct net_device *slave_dev)
{ … }

/**
 * failover_slave_unregister - Unregister a slave netdev
 *
 * @slave_dev: slave netdev that is being unregistered
 *
 * Unregisters a slave device from a failover instance.
 */
int failover_slave_unregister(struct net_device *slave_dev)
{ … }
EXPORT_SYMBOL_GPL(…);

static int failover_slave_link_change(struct net_device *slave_dev)
{ … }

static int failover_slave_name_change(struct net_device *slave_dev)
{ … }

static int
failover_event(struct notifier_block *this, unsigned long event, void *ptr)
{ … }

static struct notifier_block failover_notifier = …;

static void
failover_existing_slave_register(struct net_device *failover_dev)
{ … }

/**
 * failover_register - Register a failover instance
 *
 * @dev: failover netdev
 * @ops: failover ops
 *
 * Allocate and register a failover instance for a failover netdev. ops
 * provides handlers for slave device register/unregister/link change/
 * name change events.
 *
 * Return: pointer to failover instance
 */
struct failover *failover_register(struct net_device *dev,
				   struct failover_ops *ops)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * failover_unregister - Unregister a failover instance
 *
 * @failover: pointer to failover instance
 *
 * Unregisters and frees a failover instance.
 */
void failover_unregister(struct failover *failover)
{ … }
EXPORT_SYMBOL_GPL(…);

static __init int
failover_init(void)
{ … }
module_init(…) …;

static __exit
void failover_exit(void)
{ … }
module_exit(failover_exit);

MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;