Fri, Apr 27, 2018 at 07:06:58PM CEST, sridhar.samudrala@xxxxxxxxx wrote: >This provides a generic interface for paravirtual drivers to listen >for netdev register/unregister/link change events from pci ethernet >devices with the same MAC and takeover their datapath. The notifier and >event handling code is based on the existing netvsc implementation. > >It exposes 2 sets of interfaces to the paravirtual drivers. >1. For paravirtual drivers like virtio_net that use 3 netdev model, the > the failover module provides interfaces to create/destroy additional > master netdev and all the slave events are managed internally. > net_failover_create() > net_failover_destroy() > A failover netdev is created that acts a master device and controls 2 > slave devices. The original virtio_net netdev is registered as 'standby' > netdev and a passthru/vf device with the same MAC gets registered as > 'primary' netdev. Both 'standby' and 'primary' 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. >2. For existing netvsc driver that uses 2 netdev model, no master netdev > is created. The paravirtual driver registers each instance of netvsc > as a 'failover' netdev along with a set of ops to manage the slave > events. There is no 'standby' netdev in this model. A passthru/vf device > with the same MAC gets registered as 'primary' netdev. > net_failover_register() > net_failover_unregister() > >Signed-off-by: Sridhar Samudrala <sridhar.samudrala@xxxxxxxxx> >--- > include/linux/netdevice.h | 16 + > include/net/net_failover.h | 62 ++++ > net/Kconfig | 10 + > net/core/Makefile | 1 + > net/core/net_failover.c | 892 +++++++++++++++++++++++++++++++++++++++++++++ > 5 files changed, 981 insertions(+) > create mode 100644 include/net/net_failover.h > create mode 100644 net/core/net_failover.c checkpatch says: _exportax/0002-net-Introduce-generic-failover-module.patch ---------------------------------------------------------- WARNING: added, moved or deleted file(s), does MAINTAINERS need updating? #92: new file mode 100644 Please add an entry to the MAINTAINERS file. _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
