netdev - [PATCH net-next v4 2/7] rtnl: add helper to check if a notification is needed

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Message-Id: <20231208192847.714940-3-pctammela@mojatatu.com>
Date: Fri,  8 Dec 2023 16:28:42 -0300
From: Pedro Tammela <pctammela@...atatu.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	jhs@...atatu.com,
	xiyou.wangcong@...il.com,
	jiri@...nulli.us,
	marcelo.leitner@...il.com,
	vladbu@...dia.com,
	horms@...nel.org,
	Victor Nogueira <victor@...atatu.com>,
	Jiri Pirko <jiri@...dia.com>,
	Pedro Tammela <pctammela@...atatu.com>
Subject: [PATCH net-next v4 2/7] rtnl: add helper to check if a notification is needed

From: Victor Nogueira <victor@...atatu.com>

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@...dia.com>
Reviewed-by: Simon Horman <horms@...nel.org>
Signed-off-by: Victor Nogueira <victor@...atatu.com>
Signed-off-by: Pedro Tammela <pctammela@...atatu.com>
---
 include/linux/rtnetlink.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index a7d757e96c55..0cbbbded0331 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -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 */
-- 
2.40.1