netdev - [PATCH net 2/2] net: dsa: Always react to global bridge attribute changes

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Message-Id: <20210306002455.1582593-3-tobias@waldekranz.com>
Date:   Sat,  6 Mar 2021 01:24:55 +0100
From:   Tobias Waldekranz <tobias@...dekranz.com>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        olteanv@...il.com, netdev@...r.kernel.org
Subject: [PATCH net 2/2] net: dsa: Always react to global bridge attribute changes

This is the second attempt to provide a fix for the issue described in
99b8202b179f, which was reverted in the previous commit.

When a change is made to some global bridge attribute, such as VLAN
filtering, accept events where orig_dev is the bridge master netdev.

Separate the validation of orig_dev based on whether the attribute in
question is global or per-port.

Fixes: 5696c8aedfcc ("net: dsa: Don't offload port attributes on standalone ports")
Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>
---
 net/dsa/slave.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 491e3761b5f4..63ee2cae4d8e 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -278,8 +278,21 @@ static int dsa_slave_port_attr_set(struct net_device *dev,
 	struct dsa_port *dp = dsa_slave_to_port(dev);
 	int ret;
 
-	if (!dsa_port_offloads_netdev(dp, attr->orig_dev))
-		return -EOPNOTSUPP;
+	switch (attr->id) {
+	case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
+	case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
+	case SWITCHDEV_ATTR_ID_BRIDGE_MROUTER:
+		/* For global bridge settings, the originating device
+		 * may be the bridge itself.
+		 */
+		if (netif_is_bridge_master(attr->orig_dev))
+			break;
+
+		fallthrough;
+	default:
+		if (!dsa_port_offloads_netdev(dp, attr->orig_dev))
+			return -EOPNOTSUPP;
+	}
 
 	switch (attr->id) {
 	case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
-- 
2.25.1