Commit ca8c1f71 authored by Jonas Gorski's avatar Jonas Gorski Committed by Paolo Abeni
Browse files

net: dsa: b53: fix max MTU for BCM5325/BCM5365 



BCM5325/BCM5365 do not support jumbo frames, so we should not report a
jumbo frame mtu for them. But they do support so called "oversized"
frames up to 1536 bytes long by default, so report an appropriate MTU.

Fixes: 6ae5834b ("net: dsa: b53: add MTU configuration support")
Signed-off-by: default avatarJonas Gorski <jonas.gorski@gmail.com>
Reviewed-by: default avatarFlorian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
parent 680a8217

drivers/net/dsa/b53/b53_common.c

+6 −0
Original line number Diff line number Diff line
@@ -225,6 +225,7 @@ static const struct b53_mib_desc b53_mibs_58xx[] = { 


#define B53_MIBS_58XX_SIZE	ARRAY_SIZE(b53_mibs_58xx)



#define B53_MAX_MTU_25		(1536 - ETH_HLEN - VLAN_HLEN - ETH_FCS_LEN)

#define B53_MAX_MTU		(9720 - ETH_HLEN - VLAN_HLEN - ETH_FCS_LEN)



static int b53_do_vlan_op(struct b53_device *dev, u8 op)
@@ -2270,6 +2271,11 @@ static int b53_change_mtu(struct dsa_switch *ds, int port, int mtu) 


static int b53_get_max_mtu(struct dsa_switch *ds, int port)

{

	struct b53_device *dev = ds->priv;



	if (is5325(dev) || is5365(dev))

		return B53_MAX_MTU_25;



	return B53_MAX_MTU;

}