Commit fb77ffc6 authored by Vladimir Oltean's avatar Vladimir Oltean Committed by David S. Miller
Browse files

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: default avatarVladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c279c726

drivers/net/dsa/vitesse-vsc73xx-core.c

+20 −10
Original line number Diff line number Diff line
@@ -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)

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