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Date:   Fri, 22 May 2020 00:10:28 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
        davem@...emloft.net
Cc:     jiri@...nulli.us, idosch@...sch.org, kuba@...nel.org,
        ivecera@...hat.com, netdev@...r.kernel.org,
        horatiu.vultur@...rochip.com, allan.nielsen@...rochip.com,
        nikolay@...ulusnetworks.com, roopa@...ulusnetworks.com
Subject: [PATCH RFC net-next 05/13] net: bridge: multicast: propagate br_mc_disabled_update() return

From: Florian Fainelli <f.fainelli@...il.com>

Some Ethernet switches might not be able to support disabling multicast
flooding globally when e.g: several bridges span the same physical
device, propagate the return value of br_mc_disabled_update() such that
this propagates correctly to user-space.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 net/bridge/br_multicast.c | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index ad12fe3fca8c..9e93035b1483 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -809,7 +809,7 @@ static void br_ip6_multicast_port_query_expired(struct timer_list *t)
 }
 #endif
 
-static void br_mc_disabled_update(struct net_device *dev, bool value)
+static int br_mc_disabled_update(struct net_device *dev, bool value)
 {
 	struct switchdev_attr attr = {
 		.orig_dev = dev,
@@ -818,11 +818,13 @@ static void br_mc_disabled_update(struct net_device *dev, bool value)
 		.u.mc_disabled = !value,
 	};
 
-	switchdev_port_attr_set(dev, &attr);
+	return switchdev_port_attr_set(dev, &attr);
 }
 
 int br_multicast_add_port(struct net_bridge_port *port)
 {
+	int ret;
+
 	port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
 
 	timer_setup(&port->multicast_router_timer,
@@ -833,8 +835,11 @@ int br_multicast_add_port(struct net_bridge_port *port)
 	timer_setup(&port->ip6_own_query.timer,
 		    br_ip6_multicast_port_query_expired, 0);
 #endif
-	br_mc_disabled_update(port->dev,
-			      br_opt_get(port->br, BROPT_MULTICAST_ENABLED));
+	ret = br_mc_disabled_update(port->dev,
+				    br_opt_get(port->br,
+					       BROPT_MULTICAST_ENABLED));
+	if (ret)
+		return ret;
 
 	port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
 	if (!port->mcast_stats)
@@ -2049,12 +2054,16 @@ static void br_multicast_start_querier(struct net_bridge *br,
 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
 {
 	struct net_bridge_port *port;
+	int err = 0;
 
 	spin_lock_bh(&br->multicast_lock);
 	if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
 		goto unlock;
 
-	br_mc_disabled_update(br->dev, val);
+	err = br_mc_disabled_update(br->dev, val);
+	if (err && err != -EOPNOTSUPP)
+		goto unlock;
+
 	br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
 	if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
 		br_multicast_leave_snoopers(br);
@@ -2071,7 +2080,7 @@ int br_multicast_toggle(struct net_bridge *br, unsigned long val)
 unlock:
 	spin_unlock_bh(&br->multicast_lock);
 
-	return 0;
+	return err;
 }
 
 bool br_multicast_enabled(const struct net_device *dev)
-- 
2.25.1

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