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

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BugLink: https://bugs.launchpad.net/bugs/2097301

[ Upstream commit ca8c1f71c10193c270f772d70d34b15ad765d6a8 ]

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: 6ae5834b98 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
This commit is contained in:
Jonas Gorski
2024-10-04 10:47:19 +02:00
committed by Mehmet Basaran
parent f71041bf1f
commit 491e95c1b1
1 changed files with 6 additions and 0 deletions
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drivers/net/dsa/b53/b53_common.c
+6
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@@ -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)
@@ -2279,6 +2280,11 @@ 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;
}