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authorSridhar Samudrala <sridhar.samudrala@intel.com>2018-05-24 09:55:13 -0700
committerDavid S. Miller <davem@davemloft.net>2018-05-28 22:59:54 -0400
commit30c8bd5aa8b2c78546c3e52337101b9c85879320 (patch)
tree25da9be5c372249e23b95eeda081fdad34417dc4 /include/net/failover.h
parentcb1603948a0b80f27d2525bb7ac0d4bbb3849926 (diff)
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.h36
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 */