linux-kernel - [RFC net-next 6/9] net: dsa: Pass MST state changes to driver

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Message-Id: <20220216132934.1775649-7-tobias@waldekranz.com>
Date:   Wed, 16 Feb 2022 14:29:31 +0100
From:   Tobias Waldekranz <tobias@...dekranz.com>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bridge@...ts.linux-foundation.org
Subject: [RFC net-next 6/9] net: dsa: Pass MST state changes to driver

Add the usual trampoline functionality from the generic DSA layer down
to the drivers for MST state changes.

Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>
---
 include/net/dsa.h  |  2 ++
 net/dsa/dsa_priv.h |  2 ++
 net/dsa/port.c     | 30 ++++++++++++++++++++++++++++++
 net/dsa/slave.c    |  6 ++++++
 4 files changed, 40 insertions(+)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 2aabe7f0b176..f030afb68f46 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -882,6 +882,8 @@ struct dsa_switch_ops {
 				     struct dsa_bridge bridge);
 	void	(*port_stp_state_set)(struct dsa_switch *ds, int port,
 				      u8 state);
+	int	(*port_mst_state_set)(struct dsa_switch *ds, int port,
+				      const struct switchdev_mst_state *state);
 	void	(*port_fast_age)(struct dsa_switch *ds, int port);
 	int	(*port_pre_bridge_flags)(struct dsa_switch *ds, int port,
 					 struct switchdev_brport_flags flags,
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index 43709c005461..96d09184de5d 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -185,6 +185,8 @@ static inline struct net_device *dsa_master_find_slave(struct net_device *dev,
 void dsa_port_set_tag_protocol(struct dsa_port *cpu_dp,
 			       const struct dsa_device_ops *tag_ops);
 int dsa_port_set_state(struct dsa_port *dp, u8 state, bool do_fast_age);
+int dsa_port_set_mst_state(struct dsa_port *dp,
+			   const struct switchdev_mst_state *state);
 int dsa_port_enable_rt(struct dsa_port *dp, struct phy_device *phy);
 int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy);
 void dsa_port_disable_rt(struct dsa_port *dp);
diff --git a/net/dsa/port.c b/net/dsa/port.c
index 4fb2bf2383d9..a34779658f17 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -108,6 +108,36 @@ int dsa_port_set_state(struct dsa_port *dp, u8 state, bool do_fast_age)
 	return 0;
 }
 
+int dsa_port_set_mst_state(struct dsa_port *dp,
+			   const struct switchdev_mst_state *state)
+{
+	struct dsa_switch *ds = dp->ds;
+	int err, port = dp->index;
+
+	if (!ds->ops->port_mst_state_set)
+		return -EOPNOTSUPP;
+
+	err = ds->ops->port_mst_state_set(ds, port, state);
+	if (err)
+		return err;
+
+	if (!dsa_port_can_configure_learning(dp) || dp->learning) {
+		switch (state->state) {
+		case BR_STATE_DISABLED:
+		case BR_STATE_BLOCKING:
+		case BR_STATE_LISTENING:
+			/* Ideally we would only fast age entries
+			 * belonging to VLANs controlled by this
+			 * MST.
+			 */
+			dsa_port_fast_age(dp);
+			break;
+		}
+	}
+
+	return 0;
+}
+
 static void dsa_port_set_state_now(struct dsa_port *dp, u8 state,
 				   bool do_fast_age)
 {
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 0a5e44105add..48075d697588 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -288,6 +288,12 @@ static int dsa_slave_port_attr_set(struct net_device *dev, const void *ctx,
 
 		ret = dsa_port_set_state(dp, attr->u.stp_state, true);
 		break;
+	case SWITCHDEV_ATTR_ID_PORT_MST_STATE:
+		if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
+			return -EOPNOTSUPP;
+
+		ret = dsa_port_set_mst_state(dp, &attr->u.mst_state);
+		break;
 	case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
 		if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
 			return -EOPNOTSUPP;
-- 
2.25.1