netdev - [PATCH net-next 2/4] net: dsa: reject switchdev objects centrally from dsa_slave_port_obj

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Message-Id: <20210214155326.1783266-3-olteanv@gmail.com>
Date:   Sun, 14 Feb 2021 17:53:24 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        George McCollister <george.mccollister@...il.com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        DENG Qingfang <dqfext@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Rasmus Villemoes <rasmus.villemoes@...vas.dk>,
        Oleksij Rempel <linux@...pel-privat.de>
Subject: [PATCH net-next 2/4] net: dsa: reject switchdev objects centrally from dsa_slave_port_obj_{add,del}

From: Vladimir Oltean <vladimir.oltean@....com>

The dsa_port_offloads_netdev check is inside dsa_slave_vlan_{add,del},
but outside dsa_port_mdb_{add,del}. We can reduce the number of
occurrences of dsa_port_offloads_netdev by checking only once, at the
beginning of dsa_slave_port_obj_add and dsa_slave_port_obj_del.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 net/dsa/slave.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 94bce3596eb6..8768b213c6e0 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -340,9 +340,6 @@ static int dsa_slave_vlan_add(struct net_device *dev,
 	struct switchdev_obj_port_vlan vlan;
 	int err;
 
-	if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
-		return -EOPNOTSUPP;
-
 	if (dsa_port_skip_vlan_configuration(dp)) {
 		NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
 		return 0;
@@ -385,10 +382,11 @@ static int dsa_slave_port_obj_add(struct net_device *dev,
 	struct dsa_port *dp = dsa_slave_to_port(dev);
 	int err;
 
+	if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
+		return -EOPNOTSUPP;
+
 	switch (obj->id) {
 	case SWITCHDEV_OBJ_ID_PORT_MDB:
-		if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
-			return -EOPNOTSUPP;
 		err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 		break;
 	case SWITCHDEV_OBJ_ID_HOST_MDB:
@@ -416,9 +414,6 @@ static int dsa_slave_vlan_del(struct net_device *dev,
 	struct switchdev_obj_port_vlan *vlan;
 	int err;
 
-	if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
-		return -EOPNOTSUPP;
-
 	if (dsa_port_skip_vlan_configuration(dp))
 		return 0;
 
@@ -442,10 +437,11 @@ static int dsa_slave_port_obj_del(struct net_device *dev,
 	struct dsa_port *dp = dsa_slave_to_port(dev);
 	int err;
 
+	if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
+		return -EOPNOTSUPP;
+
 	switch (obj->id) {
 	case SWITCHDEV_OBJ_ID_PORT_MDB:
-		if (!dsa_port_offloads_netdev(dp, obj->orig_dev))
-			return -EOPNOTSUPP;
 		err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
 		break;
 	case SWITCHDEV_OBJ_ID_HOST_MDB:
-- 
2.25.1