linux-kernel - [PATCH 4/5] net: dsa: b53: allow lower MTUs on BCM5325/5365

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Message-Id: <20241004-b53_jumbo_fixes-v1-4-ce1e54aa7b3c@gmail.com>
Date: Fri, 04 Oct 2024 10:47:20 +0200
From: Jonas Gorski <jonas.gorski@...il.com>
To: Florian Fainelli <florian.fainelli@...adcom.com>, 
 Andrew Lunn <andrew@...n.ch>, Vladimir Oltean <olteanv@...il.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Murali Krishna Policharla <murali.policharla@...adcom.com>, 
 Russell King <linux@...linux.org.uk>
Cc: Florian Fainelli <f.fainelli@...il.com>, 
 Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] net: dsa: b53: allow lower MTUs on BCM5325/5365

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@...il.com>
---
 drivers/net/dsa/b53/b53_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index e8b20bfa8b83ea7ac643bd5d005e2983747bd478..5b83f9b6cdac3de6c5e6e2164c78146d694674cd 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -2258,7 +2258,7 @@ 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;

-- 
2.43.0