Hi! CRIU currently do not support checkpoint/restore of OVS configurations, but there was several requests for it. For example, https://github.com/lxc/lxc/issues/2909
The main problem is ifindexes of newly created interfaces. We realy need to preserve them after restore. Current openvswitch API does not allow to specify ifindex. Most of the time we can just create an interface via generic netlink requests and plug it into ovs but datapaths (generally any OVS_VPORT_TYPE_INTERNAL) can only be created via openvswitch requests which do not support selecting ifindex. This patch allows to do so. For new datapaths I decided to use dp_infindex in header as infindex because it control ifindex for other requests too. For internal vports I reused OVS_VPORT_ATTR_IFINDEX. The only concern I have is that previously dp_ifindex was not used for OVS_DP_VMD_NEW requests and some software may not set it to zero. However we have been running this patch at Virtuozzo for 2 years and have not encountered this problem. Not sure if it is worth to add new ovs_datapath_attr instead. v2: Added two more patches. Add OVS_DP_ATTR_PER_CPU_PIDS to dumps as suggested by Ilya Maximets. Without it we won't be able to checkpoint/restore new openvswitch configurations which use OVS_DP_F_DISPATCH_UPCALL_PER_CPU flag. Found and fixed memory leak on datapath creation error path. v3: Sent memleak fix separately to net. Improved patches according to the reviews: - Added new OVS_DP_ATTR_IFINDEX instead of using ovs_header->dp_ifindex - Pre-allocated bigger reply message for upcall pids - Some small fixes Andrey Zhadchenko (2): openvswitch: allow specifying ifindex of new interfaces openvswitch: add OVS_DP_ATTR_PER_CPU_PIDS to get requests include/uapi/linux/openvswitch.h | 3 +++ net/openvswitch/datapath.c | 21 ++++++++++++++++++--- net/openvswitch/vport-internal_dev.c | 1 + net/openvswitch/vport.h | 2 ++ 4 files changed, 24 insertions(+), 3 deletions(-) -- 2.31.1 _______________________________________________ dev mailing list d...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-dev
