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Date:   Mon,  3 Aug 2020 13:03:53 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next 4/5] net: dsa: loop: Wire-up MTU callbacks

For now we simply store the port MTU into a per-port member.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/net/dsa/dsa_loop.c | 17 +++++++++++++++++
 include/linux/dsa/loop.h   |  1 +
 2 files changed, 18 insertions(+)

diff --git a/drivers/net/dsa/dsa_loop.c b/drivers/net/dsa/dsa_loop.c
index ed0b580c9944..6a7d661b5a59 100644
--- a/drivers/net/dsa/dsa_loop.c
+++ b/drivers/net/dsa/dsa_loop.c
@@ -225,6 +225,21 @@ static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
 	return 0;
 }
 
+static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port,
+				    int new_mtu)
+{
+	struct dsa_loop_priv *priv = ds->priv;
+
+	priv->ports[port].mtu = new_mtu;
+
+	return 0;
+}
+
+static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)
+{
+	return ETH_MAX_MTU;
+}
+
 static const struct dsa_switch_ops dsa_loop_driver = {
 	.get_tag_protocol	= dsa_loop_get_protocol,
 	.setup			= dsa_loop_setup,
@@ -241,6 +256,8 @@ static const struct dsa_switch_ops dsa_loop_driver = {
 	.port_vlan_prepare	= dsa_loop_port_vlan_prepare,
 	.port_vlan_add		= dsa_loop_port_vlan_add,
 	.port_vlan_del		= dsa_loop_port_vlan_del,
+	.port_change_mtu	= dsa_loop_port_change_mtu,
+	.port_max_mtu		= dsa_loop_port_max_mtu,
 };
 
 static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
diff --git a/include/linux/dsa/loop.h b/include/linux/dsa/loop.h
index bb39401a8056..5a3470bcc8a7 100644
--- a/include/linux/dsa/loop.h
+++ b/include/linux/dsa/loop.h
@@ -27,6 +27,7 @@ enum dsa_loop_mib_counters {
 struct dsa_loop_port {
 	struct dsa_loop_mib_entry mib[__DSA_LOOP_CNT_MAX];
 	u16 pvid;
+	int mtu;
 };
 
 struct dsa_loop_priv {
-- 
2.25.1

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