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| author | Jonas Gorski <jonas.gorski@gmail.com> | 2024-10-04 10:47:19 +0200 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2024-10-08 10:42:27 +0200 |
| commit | ca8c1f71c10193c270f772d70d34b15ad765d6a8 (patch) | |
| tree | 7daa8bed41948fd047f1c3affcccedcf03033c2e /drivers | |
| parent | 680a8217dc00dc7e7da57888b3c053289b60eb2b (diff) | |
| download | lwn-ca8c1f71c10193c270f772d70d34b15ad765d6a8.tar.gz lwn-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')
| -rw-r--r-- | drivers/net/dsa/b53/b53_common.c | 6 |
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; } |