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authorJonas Gorski <jonas.gorski@gmail.com>2024-10-04 10:47:19 +0200
committerPaolo Abeni <pabeni@redhat.com>2024-10-08 10:42:27 +0200
commitca8c1f71c10193c270f772d70d34b15ad765d6a8 (patch)
tree7daa8bed41948fd047f1c3affcccedcf03033c2e /drivers/net
parentnet: dsa: b53: fix max MTU for 1g switches (diff)
downloadlinux-ca8c1f71c10193c270f772d70d34b15ad765d6a8.tar.xz
linux-ca8c1f71c10193c270f772d70d34b15ad765d6a8.zip
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: 6ae5834b983a ("net: dsa: b53: add MTU configuration support") Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com> Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/dsa/b53/b53_common.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 6fed3eb15ad9..e8b20bfa8b83 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -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;
}