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rtnl: add helper to check if a notification is needed 

Building on the rtnl_has_listeners helper, add the rtnl_notify_needed
helper to check if we can bail out early in the notification routines.

Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Victor Nogueira <victor@mojatatu.com>
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Link: https://lore.kernel.org/r/20231208192847.714940-3-pctammela@mojatatu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Victor Nogueira 2023-12-08 16:28:42 -03:00 committed by Jakub Kicinski
parent c5e2a97344
commit 8439109b76
1 changed files with 15 additions and 0 deletions
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15
include/linux/rtnetlink.h
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@ -137,4 +137,19 @@ static inline int rtnl_has_listeners(const struct net *net, u32 group)
return netlink_has_listeners(rtnl, group);
}
/**
* rtnl_notify_needed - check if notification is needed
* @net: Pointer to the net namespace
* @nlflags: netlink ingress message flags
* @group: rtnl group
*
* Based on the ingress message flags and rtnl group, returns true
* if a notification is needed, false otherwise.
*/
static inline bool
rtnl_notify_needed(const struct net *net, u16 nlflags, u32 group)
{
return (nlflags & NLM_F_ECHO) || rtnl_has_listeners(net, group);
}
#endif /* __LINUX_RTNETLINK_H */