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| author | Sridhar Samudrala <sridhar.samudrala@intel.com> | 2018-05-24 09:55:13 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-05-28 22:59:54 -0400 |
| commit | 30c8bd5aa8b2c78546c3e52337101b9c85879320 (patch) | |
| tree | 25da9be5c372249e23b95eeda081fdad34417dc4 /include/net/failover.h | |
| parent | cb1603948a0b80f27d2525bb7ac0d4bbb3849926 (diff) | |
| download | lwn-30c8bd5aa8b2c78546c3e52337101b9c85879320.tar.gz lwn-30c8bd5aa8b2c78546c3e52337101b9c85879320.zip | |
net: Introduce generic failover module
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>
Diffstat (limited to 'include/net/failover.h')
| -rw-r--r-- | include/net/failover.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/include/net/failover.h b/include/net/failover.h new file mode 100644 index 000000000000..bb15438f39c7 --- /dev/null +++ b/include/net/failover.h @@ -0,0 +1,36 @@ +/* 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 */ |