netdev - [PATCH net-next 3/4] net/sched: act_api: conditional notification of events

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Date: Fri,  1 Dec 2023 17:43:13 -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,
	Pedro Tammela <pctammela@...atatu.com>
Subject: [PATCH net-next 3/4] net/sched: act_api: conditional notification of events

As of today tc-action events are unconditionally built and sent to
RTNLGRP_TC. As with the introduction of tc_should_notify we can check
before-hand if they are really needed.

Signed-off-by: Pedro Tammela <pctammela@...atatu.com>
---
 net/sched/act_api.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index c39252d61ebb..2570f9702eeb 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -1791,6 +1791,13 @@ tcf_reoffload_del_notify(struct net *net, struct tc_action *action)
 	struct sk_buff *skb;
 	int ret;
 
+	if (!tc_should_notify(net, 0)) {
+		ret = tcf_idr_release_unsafe(action);
+		if (ret == ACT_P_DELETED)
+			module_put(ops->owner);
+		return ret;
+	}
+
 	skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
 			GFP_KERNEL);
 	if (!skb)
@@ -1877,6 +1884,13 @@ tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
 	int ret;
 	struct sk_buff *skb;
 
+	if (!tc_should_notify(net, n->nlmsg_flags)) {
+		ret = tcf_action_delete(net, actions);
+		if (ret < 0)
+			NL_SET_ERR_MSG(extack, "Failed to delete TC action");
+		return ret;
+	}
+
 	skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
 			GFP_KERNEL);
 	if (!skb)
@@ -1956,6 +1970,9 @@ tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
 {
 	struct sk_buff *skb;
 
+	if (!tc_should_notify(net, n->nlmsg_flags))
+		return 0;
+
 	skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
 			GFP_KERNEL);
 	if (!skb)
-- 
2.40.1