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The net_failover driver provides an automated failover mechanism via APIs to create and destroy a failover master netdev and manages a primary and standby slave netdevs that get registered via the generic failover infrastructure. The failover netdev acts a master device and controls 2 slave devices. The original paravirtual interface gets registered as 'standby' slave netdev and a passthru/vf device with the same MAC gets registered as 'primary' slave netdev. Both 'standby' and 'failover' netdevs are associated with the same 'pci' device. The user accesses the network interface via 'failover' netdev. The 'failover' netdev chooses 'primary' netdev as default for transmits when it is available with link up and running. This can be used by paravirtual drivers to enable an alternate low latency datapath. It also enables hypervisor controlled live migration of a VM with direct attached VF 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>
40 lines
1,023 B
C
40 lines
1,023 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2018, Intel Corporation. */
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#ifndef _NET_FAILOVER_H
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#define _NET_FAILOVER_H
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#include <net/failover.h>
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/* failover state */
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struct net_failover_info {
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/* primary netdev with same MAC */
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struct net_device __rcu *primary_dev;
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/* standby netdev */
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struct net_device __rcu *standby_dev;
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/* primary netdev stats */
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struct rtnl_link_stats64 primary_stats;
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/* standby netdev stats */
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struct rtnl_link_stats64 standby_stats;
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/* aggregated stats */
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struct rtnl_link_stats64 failover_stats;
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/* spinlock while updating stats */
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spinlock_t stats_lock;
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};
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struct failover *net_failover_create(struct net_device *standby_dev);
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void net_failover_destroy(struct failover *failover);
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#define FAILOVER_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
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NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
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NETIF_F_HIGHDMA | NETIF_F_LRO)
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#define FAILOVER_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
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NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
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#endif /* _NET_FAILOVER_H */
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