netdev - [PATCH net] net: dsa: fix older DSA drivers using phylink

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Message-Id: <E1qOflM-001AEz-D3@rmk-PC.armlinux.org.uk>
Date: Wed, 26 Jul 2023 15:45:16 +0100
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <olteanv@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org
Subject: [PATCH net] net: dsa: fix older DSA drivers using phylink

Older DSA drivers that do not provide an dsa_ops adjust_link method end
up using phylink. Unfortunately, a recent phylink change that requires
its supported_interfaces bitmap to be filled breaks these drivers
because the bitmap remains empty.

Rather than fixing each driver individually, fix it in the core code so
we have a sensible set of defaults.

Reported-by: Sergei Antonov <saproj@...il.com>
Fixes: de5c9bf40c45 ("net: phylink: require supported_interfaces to be filled")
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 net/dsa/port.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/net/dsa/port.c b/net/dsa/port.c
index 0ce8fd311c78..2f6195d7b741 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -1727,8 +1727,15 @@ int dsa_port_phylink_create(struct dsa_port *dp)
 	    ds->ops->phylink_mac_an_restart)
 		dp->pl_config.legacy_pre_march2020 = true;
 
-	if (ds->ops->phylink_get_caps)
+	if (ds->ops->phylink_get_caps) {
 		ds->ops->phylink_get_caps(ds, dp->index, &dp->pl_config);
+	} else {
+		/* For legacy drivers */
+		__set_bit(PHY_INTERFACE_MODE_INTERNAL,
+			  dp->pl_config.supported_interfaces);
+		__set_bit(PHY_INTERFACE_MODE_GMII,
+			  dp->pl_config.supported_interfaces);
+	}
 
 	pl = phylink_create(&dp->pl_config, of_fwnode_handle(dp->dn),
 			    mode, &dsa_port_phylink_mac_ops);
-- 
2.30.2