netdev - [RFC net-next v2 4/5] net:sched:act_sample: add action cookie to sample

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Date: Mon,  8 Apr 2024 14:57:43 +0200
From: Adrian Moreno <amorenoz@...hat.com>
To: netdev@...r.kernel.org
Cc: Adrian Moreno <amorenoz@...hat.com>,
	jiri@...nulli.us,
	xiyou.wangcong@...il.com,
	cmi@...dia.com,
	yotam.gi@...il.com,
	i.maximets@....org,
	aconole@...hat.com,
	echaudro@...hat.com,
	horms@...nel.org
Subject: [RFC net-next v2 4/5] net:sched:act_sample: add action cookie to sample

If the action has a user_cookie, pass it along to the sample so it can
be easily identified.

Signed-off-by: Adrian Moreno <amorenoz@...hat.com>
---
 net/sched/act_sample.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/net/sched/act_sample.c b/net/sched/act_sample.c
index a69b53d54039..5c3f86ec964a 100644
--- a/net/sched/act_sample.c
+++ b/net/sched/act_sample.c
@@ -165,9 +165,11 @@ TC_INDIRECT_SCOPE int tcf_sample_act(struct sk_buff *skb,
 				     const struct tc_action *a,
 				     struct tcf_result *res)
 {
+	u8 cookie_data[TC_COOKIE_MAX_SIZE] = {};
 	struct tcf_sample *s = to_sample(a);
 	struct psample_group *psample_group;
 	struct psample_metadata md = {};
+	struct tc_cookie *user_cookie;
 	int retval;
 
 	tcf_lastuse_update(&s->tcf_tm);
@@ -189,6 +191,16 @@ TC_INDIRECT_SCOPE int tcf_sample_act(struct sk_buff *skb,
 		if (skb_at_tc_ingress(skb) && tcf_sample_dev_ok_push(skb->dev))
 			skb_push(skb, skb->mac_len);
 
+		rcu_read_lock();
+		user_cookie = rcu_dereference(a->user_cookie);
+		if (user_cookie) {
+			memcpy(cookie_data, user_cookie->data,
+			       user_cookie->len);
+			md.user_cookie = cookie_data;
+			md.user_cookie_len = user_cookie->len;
+		}
+		rcu_read_unlock();
+
 		md.trunc_size = s->truncate ? s->trunc_size : skb->len;
 		psample_sample_packet(psample_group, skb, s->rate, &md);
 
-- 
2.44.0