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net: ocelot: add support for ndo_change_mtu

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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>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Clément Léger 2021-12-09 16:49:10 +01:00 committed by Jakub Kicinski
parent b471a71e52
commit de5841e1c9
2 changed files with 16 additions and 0 deletions
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2
drivers/net/ethernet/mscc/ocelot.h
View file

@ -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;

14
drivers/net/ethernet/mscc/ocelot_net.c
View file

@ -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;