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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>
37 lines
1.2 KiB
C
37 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2018, Intel Corporation. */
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#ifndef _FAILOVER_H
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#define _FAILOVER_H
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#include <linux/netdevice.h>
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struct failover_ops {
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int (*slave_pre_register)(struct net_device *slave_dev,
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struct net_device *failover_dev);
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int (*slave_register)(struct net_device *slave_dev,
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struct net_device *failover_dev);
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int (*slave_pre_unregister)(struct net_device *slave_dev,
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struct net_device *failover_dev);
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int (*slave_unregister)(struct net_device *slave_dev,
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struct net_device *failover_dev);
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int (*slave_link_change)(struct net_device *slave_dev,
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struct net_device *failover_dev);
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int (*slave_name_change)(struct net_device *slave_dev,
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struct net_device *failover_dev);
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rx_handler_result_t (*slave_handle_frame)(struct sk_buff **pskb);
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};
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struct failover {
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struct list_head list;
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struct net_device __rcu *failover_dev;
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struct failover_ops __rcu *ops;
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};
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struct failover *failover_register(struct net_device *dev,
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struct failover_ops *ops);
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void failover_unregister(struct failover *failover);
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int failover_slave_unregister(struct net_device *slave_dev);
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#endif /* _FAILOVER_H */
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