netdev - [PATCH v4 net-next 2/5] net: dsa: Don't offload port attributes on standalone ports

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Date:   Wed, 16 Dec 2020 17:00:53 +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, j.vosburgh@...il.com, vfalico@...il.com,
        andy@...yhouse.net, netdev@...r.kernel.org
Subject: [PATCH v4 net-next 2/5] net: dsa: Don't offload port attributes on standalone ports

In a situation where a standalone port is indirectly attached to a
bridge (e.g. via a LAG) which is not offloaded, do not offload any
port attributes either. The port should behave as a standard NIC.

Previously, on mv88e6xxx, this meant that in the following setup:

     br0
     /
  team0
   / \
swp0 swp1

If vlan filtering was enabled on br0, swp0's and swp1's QMode was set
to "secure". This caused all untagged packets to be dropped, as their
default VID (0) was not loaded into the VTU.

Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>
---
 net/dsa/slave.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 4a0498bf6c65..faae8dcc0849 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -274,6 +274,9 @@ static int dsa_slave_port_attr_set(struct net_device *dev,
 	struct dsa_port *dp = dsa_slave_to_port(dev);
 	int ret;

+	if (attr->orig_dev != dev)
+		return -EOPNOTSUPP;
+
 	switch (attr->id) {
 	case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 		ret = dsa_port_set_state(dp, attr->u.stp_state, trans);
-- 
2.17.1