netdev - [RFC PATCH net-next 4/6] net: dsa: refuse cross-chip mirroring operations

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Message-Id: <20240913152915.2981126-5-vladimir.oltean@nxp.com>
Date: Fri, 13 Sep 2024 18:29:13 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	Petr Machata <petrm@...dia.com>,
	Ido Schimmel <idosch@...dia.com>,
	Claudiu Manoil <claudiu.manoil@....com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	UNGLinuxDriver@...rochip.com,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Cong Wang <xiyou.wangcong@...il.com>,
	Jiri Pirko <jiri@...nulli.us>,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH net-next 4/6] net: dsa: refuse cross-chip mirroring operations

These are not implemented but are not rejected either. Do so now.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 net/dsa/user.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/net/dsa/user.c b/net/dsa/user.c
index 42ff3415c808..c8ddbe22d647 100644
--- a/net/dsa/user.c
+++ b/net/dsa/user.c
@@ -1401,6 +1401,14 @@ dsa_user_add_cls_matchall_mirred(struct net_device *dev,
 	if (!dsa_user_dev_check(act->dev))
 		return -EOPNOTSUPP;
 
+	to_dp = dsa_user_to_port(act->dev);
+
+	if (dp->ds != to_dp->ds) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Cross-chip mirroring not implemented");
+		return -EOPNOTSUPP;
+	}
+
 	mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
 	if (!mall_tc_entry)
 		return -ENOMEM;
@@ -1408,9 +1416,6 @@ dsa_user_add_cls_matchall_mirred(struct net_device *dev,
 	mall_tc_entry->cookie = cls->cookie;
 	mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
 	mirror = &mall_tc_entry->mirror;
-
-	to_dp = dsa_user_to_port(act->dev);
-
 	mirror->to_local_port = to_dp->index;
 	mirror->ingress = ingress;
 
-- 
2.34.1