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openvswitch: allow specifying ifindex of new interfaces

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CRIU is preserving ifindexes of net devices after restoration. However,
current Open vSwitch API does not allow to target ifindex, so we cannot
correctly restore OVS configuration.

Add new OVS_DP_ATTR_IFINDEX for OVS_DP_CMD_NEW and use it as desired
ifindex.
Use OVS_VPORT_ATTR_IFINDEX during OVS_VPORT_CMD_NEW to specify new netdev
ifindex.

Signed-off-by: Andrey Zhadchenko <andrey.zhadchenko@virtuozzo.com>
Acked-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Andrey Zhadchenko 2022-08-25 05:04:49 +03:00 • committed by Jakub Kicinski
parent f7650d82e7
commit 54c4ef34c4
4 changed files with 15 additions and 2 deletions
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3
include/uapi/linux/openvswitch.h
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@ -76,6 +76,8 @@ enum ovs_datapath_cmd {
* datapath. Always present in notifications.
* @OVS_DP_ATTR_MEGAFLOW_STATS: Statistics about mega flow masks usage for the
* datapath. Always present in notifications.
* @OVS_DP_ATTR_IFINDEX: Interface index for a new datapath netdev. Only
* valid for %OVS_DP_CMD_NEW requests.
*
* These attributes follow the &struct ovs_header within the Generic Netlink
* payload for %OVS_DP_* commands.
@ -92,6 +94,7 @@ enum ovs_datapath_attr {
OVS_DP_ATTR_PER_CPU_PIDS, /* Netlink PIDS to receive upcalls in
* per-cpu dispatch mode
*/
OVS_DP_ATTR_IFINDEX,
__OVS_DP_ATTR_MAX
};