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net: dsa: vsc73xx: make the MTU configurable 

Instead of hardcoding the MTU to the maximum value allowed by the
hardware, obey the value known by the operating system.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean 2020-03-27 21:55:46 +02:00 committed by David S. Miller
parent c279c7261a
commit fb77ffc6ec
1 changed files with 20 additions and 10 deletions
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30
drivers/net/dsa/vitesse-vsc73xx-core.c
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@ -664,16 +664,6 @@ static void vsc73xx_init_port(struct vsc73xx *vsc, int port)
VSC73XX_MAC_CFG_TX_EN |
VSC73XX_MAC_CFG_RX_EN);
/* Max length, we can do up to 9.6 KiB, so allow that.
* According to application not "VSC7398 Jumbo Frames" setting
* up the MTU to 9.6 KB does not affect the performance on standard
* frames, so just enable it. It is clear from the application note
* that "9.6 kilobytes" == 9600 bytes.
*/
vsc73xx_write(vsc, VSC73XX_BLOCK_MAC,
port,
VSC73XX_MAXLEN, 9600);
/* Flow control for the CPU port:
* Use a zero delay pause frame when pause condition is left
* Obey pause control frames
@ -1030,6 +1020,24 @@ static void vsc73xx_get_ethtool_stats(struct dsa_switch *ds, int port,
}
}
static int vsc73xx_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
{
struct vsc73xx *vsc = ds->priv;
return vsc73xx_write(vsc, VSC73XX_BLOCK_MAC, port,
VSC73XX_MAXLEN, new_mtu);
}
/* According to application not "VSC7398 Jumbo Frames" setting
* up the MTU to 9.6 KB does not affect the performance on standard
* frames. It is clear from the application note that
* "9.6 kilobytes" == 9600 bytes.
*/
static int vsc73xx_get_max_mtu(struct dsa_switch *ds, int port)
{
return 9600;
}
static const struct dsa_switch_ops vsc73xx_ds_ops = {
.get_tag_protocol = vsc73xx_get_tag_protocol,
.setup = vsc73xx_setup,
@ -1041,6 +1049,8 @@ static const struct dsa_switch_ops vsc73xx_ds_ops = {
.get_sset_count = vsc73xx_get_sset_count,
.port_enable = vsc73xx_port_enable,
.port_disable = vsc73xx_port_disable,
.port_change_mtu = vsc73xx_change_mtu,
.port_max_mtu = vsc73xx_get_max_mtu,
};
static int vsc73xx_gpio_get(struct gpio_chip *chip, unsigned int offset)