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net: Introduce generic failover module

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The failover module provides a generic interface for paravirtual drivers
to register a netdev and a set of ops with a failover instance. The ops
are used as event handlers that get called to handle netdev register/
unregister/link change/name change events on slave pci ethernet devices
with the same mac address as the failover netdev.

This enables paravirtual drivers to use a VF as an accelerated low latency
datapath. It also allows migration of VMs with direct attached VFs by
failing over to the paravirtual datapath when the VF is unplugged.

Signed-off-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sridhar Samudrala
2018-05-24 09:55:13 -07:00
committed by David S. Miller
parent cb1603948a
commit 30c8bd5aa8
7 changed files with 407 additions and 0 deletions
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36
include/net/failover.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2018, Intel Corporation. */
#ifndef _FAILOVER_H
#define _FAILOVER_H
#include <linux/netdevice.h>
struct failover_ops {
int (*slave_pre_register)(struct net_device *slave_dev,
struct net_device *failover_dev);
int (*slave_register)(struct net_device *slave_dev,
struct net_device *failover_dev);
int (*slave_pre_unregister)(struct net_device *slave_dev,
struct net_device *failover_dev);
int (*slave_unregister)(struct net_device *slave_dev,
struct net_device *failover_dev);
int (*slave_link_change)(struct net_device *slave_dev,
struct net_device *failover_dev);
int (*slave_name_change)(struct net_device *slave_dev,
struct net_device *failover_dev);
rx_handler_result_t (*slave_handle_frame)(struct sk_buff **pskb);
};
struct failover {
struct list_head list;
struct net_device __rcu *failover_dev;
struct failover_ops __rcu *ops;
};
struct failover *failover_register(struct net_device *dev,
struct failover_ops *ops);
void failover_unregister(struct failover *failover);
int failover_slave_unregister(struct net_device *slave_dev);
#endif /* _FAILOVER_H */