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[net-next,v6,3/4] net: ocelot: add support for ndo_change_mtu

Message ID 20211207154839.1864114-4-clement.leger@bootlin.com
State Accepted
Commit de5841e1c93f2275bb73c471255b718b5ec2f0ec
Headers show
Series [net-next,v6,1/4] net: ocelot: export ocelot_ifh_port_set() to setup IFH | expand

Commit Message

Clément Léger Dec. 7, 2021, 3:48 p.m. UTC 
This commit adds support for changing MTU for the ocelot register based
interface. For ocelot, JUMBO frame size can be set up to 25000 bytes
but has been set to 9000 which is a saner value and allows for maximum
gain of performance with FDMA.

Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Clément Léger <clement.leger@bootlin.com>
---
 drivers/net/ethernet/mscc/ocelot.h     |  2 ++
 drivers/net/ethernet/mscc/ocelot_net.c | 14 ++++++++++++++
 2 files changed, 16 insertions(+)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/mscc/ocelot.h b/drivers/net/ethernet/mscc/ocelot.h
index 1eb0b5ad51e9..bf4eff6d7086 100644
--- a/drivers/net/ethernet/mscc/ocelot.h
+++ b/drivers/net/ethernet/mscc/ocelot.h
@@ -32,6 +32,8 @@ 
 
 #define OCELOT_PTP_QUEUE_SZ	128
 
+#define OCELOT_JUMBO_MTU	9000
+
 struct ocelot_port_tc {
 	bool block_shared;
 	unsigned long offload_cnt;
diff --git a/drivers/net/ethernet/mscc/ocelot_net.c b/drivers/net/ethernet/mscc/ocelot_net.c
index d9694dc14a2d..d83d3ffba3ac 100644
--- a/drivers/net/ethernet/mscc/ocelot_net.c
+++ b/drivers/net/ethernet/mscc/ocelot_net.c
@@ -764,10 +764,23 @@  static int ocelot_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 	return phy_mii_ioctl(dev->phydev, ifr, cmd);
 }
 
+static int ocelot_change_mtu(struct net_device *dev, int new_mtu)
+{
+	struct ocelot_port_private *priv = netdev_priv(dev);
+	struct ocelot_port *ocelot_port = &priv->port;
+	struct ocelot *ocelot = ocelot_port->ocelot;
+
+	ocelot_port_set_maxlen(ocelot, priv->chip_port, new_mtu);
+	WRITE_ONCE(dev->mtu, new_mtu);
+
+	return 0;
+}
+
 static const struct net_device_ops ocelot_port_netdev_ops = {
 	.ndo_open			= ocelot_port_open,
 	.ndo_stop			= ocelot_port_stop,
 	.ndo_start_xmit			= ocelot_port_xmit,
+	.ndo_change_mtu			= ocelot_change_mtu,
 	.ndo_set_rx_mode		= ocelot_set_rx_mode,
 	.ndo_set_mac_address		= ocelot_port_set_mac_address,
 	.ndo_get_stats64		= ocelot_get_stats64,
@@ -1670,6 +1683,7 @@  int ocelot_probe_port(struct ocelot *ocelot, int port, struct regmap *target,
 
 	dev->netdev_ops = &ocelot_port_netdev_ops;
 	dev->ethtool_ops = &ocelot_ethtool_ops;
+	dev->max_mtu = OCELOT_JUMBO_MTU;
 
 	dev->hw_features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_RXFCS |
 		NETIF_F_HW_TC;