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netlink: Add field to skip in-kernel notifications 

The struct includes a 'skip_notify' flag that indicates if netlink
notifications to user space should be suppressed. As explained in commit
3b1137fe74 ("net: ipv6: Change notifications for multipath add to
RTA_MULTIPATH"), this is useful to suppress per-nexthop RTM_NEWROUTE
notifications when an IPv6 multipath route is added / deleted. Instead,
one notification is sent for the entire multipath route.

This concept is also useful for in-kernel notifications. Sending one
in-kernel notification for the addition / deletion of an IPv6 multipath
route - instead of one per-nexthop - provides a significant increase in
the insertion / deletion rate to underlying devices.

Add a 'skip_notify_kernel' flag to suppress in-kernel notifications.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2019-06-18 18:12:44 +03:00 committed by David S. Miller
parent 3de205cde4
commit c82481f7ea
1 changed files with 3 additions and 1 deletions
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4
include/net/netlink.h
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@ -381,12 +381,14 @@ struct nla_policy {
* @nl_net: Network namespace
* @portid: Netlink PORTID of requesting application
* @skip_notify: Skip netlink notifications to user space
* @skip_notify_kernel: Skip selected in-kernel notifications
*/
struct nl_info {
struct nlmsghdr *nlh;
struct net *nl_net;
u32 portid;
bool skip_notify;
u8 skip_notify:1,
skip_notify_kernel:1;
};
/**