armbian/linux-rockchip
0
0
Fork 0
mirror of https://github.com/armbian/linux-rockchip.git synced 2026-01-06 11:08:10 -08:00
Code Issues Packages Projects Releases Wiki Activity

net: Introduce net_failover driver

Browse Source 
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>
This commit is contained in:
Sridhar Samudrala
2018-05-24 09:55:15 -07:00
committed by David S. Miller
parent 1ff78076d8
commit cfc80d9a11
6 changed files with 923 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
Documentation/networking/net_failover.rst Normal file
View File

@@ -0,0 +1,26 @@
.. SPDX-License-Identifier: GPL-2.0
============
NET_FAILOVER
============
Overview
========
The net_failover driver provides an automated failover mechanism via APIs
to create and destroy a failover master netdev and mananges a primary and
standby slave netdevs that get registered via the generic failover
infrastructrure.
The failover netdev acts a master device and controls 2 slave devices. The
original paravirtual interface is 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.

8
MAINTAINERS
View File

@@ -9654,6 +9654,14 @@ S: Maintained
F: Documentation/hwmon/nct6775
F: drivers/hwmon/nct6775.c
NET_FAILOVER MODULE
M: Sridhar Samudrala <sridhar.samudrala@intel.com>
L: netdev@vger.kernel.org
S: Supported
F: driver/net/net_failover.c
F: include/net/net_failover.h
F: Documentation/networking/net_failover.rst
NETEFFECT IWARP RNIC DRIVER (IW_NES)
M: Faisal Latif <faisal.latif@intel.com>
L: linux-rdma@vger.kernel.org

12
drivers/net/Kconfig
View File

@@ -510,4 +510,16 @@ config NETDEVSIM
To compile this driver as a module, choose M here: the module
will be called netdevsim.
config NET_FAILOVER
tristate "Failover driver"
select FAILOVER
help
This 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. This can be used by paravirtual drivers to enable
an alternate low latency datapath. It alsoenables live migration of
a VM with direct attached VF by failing over to the paravirtual
datapath when the VF is unplugged.
endif # NETDEVICES

1
drivers/net/Makefile
View File

@@ -78,3 +78,4 @@ obj-$(CONFIG_FUJITSU_ES) += fjes/
thunderbolt-net-y += thunderbolt.o
obj-$(CONFIG_THUNDERBOLT_NET) += thunderbolt-net.o
obj-$(CONFIG_NETDEVSIM) += netdevsim/
obj-$(CONFIG_NET_FAILOVER) += net_failover.o

836
drivers/net/net_failover.c Normal file
View File

File diff suppressed because it is too large Load Diff

40
include/net/net_failover.h Normal file
View File

@@ -0,0 +1,40 @@
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2018, Intel Corporation. */
#ifndef _NET_FAILOVER_H
#define _NET_FAILOVER_H
#include <net/failover.h>
/* failover state */
struct net_failover_info {
/* primary netdev with same MAC */
struct net_device __rcu *primary_dev;
/* standby netdev */
struct net_device __rcu *standby_dev;
/* primary netdev stats */
struct rtnl_link_stats64 primary_stats;
/* standby netdev stats */
struct rtnl_link_stats64 standby_stats;
/* aggregated stats */
struct rtnl_link_stats64 failover_stats;
/* spinlock while updating stats */
spinlock_t stats_lock;
};
struct failover *net_failover_create(struct net_device *standby_dev);
void net_failover_destroy(struct failover *failover);
#define FAILOVER_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
NETIF_F_HIGHDMA | NETIF_F_LRO)
#define FAILOVER_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
#endif /* _NET_FAILOVER_H */