From: Jonas Gorski <jonas.gorski@gmail.com>
Date: Fri, 4 Oct 2024 08:47:20 +0000 (+0200)
Subject: net: dsa: b53: allow lower MTUs on BCM5325/5365
X-Git-Tag: v5.15.168~52
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6bc26a82b6df3f6da06e3b9debc810f428322a02;p=thirdparty%2Fkernel%2Fstable.git

net: dsa: b53: allow lower MTUs on BCM5325/5365

[ Upstream commit e4b294f88a32438baf31762441f3dd1c996778be ]

While BCM5325/5365 do not support jumbo frames, they do support slightly
oversized frames, so do not error out if requesting a supported MTU for
them.

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 3aa0a60d7c71e..cc030f8789053 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -2225,7 +2225,7 @@ static int b53_change_mtu(struct dsa_switch *ds, int port, int mtu)
 	bool allow_10_100;
 
 	if (is5325(dev) || is5365(dev))
-		return -EOPNOTSUPP;
+		return 0;
 
 	if (!dsa_is_cpu_port(ds, port))
 		return 0;