netdev - [PATCH RFC net-next 3/8] net: dsa: mark DSA phylink as legacy_pre

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Date:   Tue, 23 Nov 2021 10:00:24 +0000
From:   "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To:     Chris Snook <chris.snook@...il.com>, Felix Fietkau <nbd@....name>,
        Florian Fainelli <f.fainelli@...il.com>,
        John Crispin <john@...ozen.org>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Michal Simek <michal.simek@...inx.com>,
        Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org
Subject: [PATCH RFC net-next 3/8] net: dsa: mark DSA phylink as
 legacy_pre_march2020

As DSA doesn't make use of the PCS support, but it does have PCS, it
must be marked as a pre-March 2020 driver to maintain the old phylink
behaviour.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 net/dsa/port.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/dsa/port.c b/net/dsa/port.c
index eaa66114924b..cfb48dc57f73 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -1091,6 +1091,13 @@ int dsa_port_phylink_create(struct dsa_port *dp)
 	if (err)
 		mode = PHY_INTERFACE_MODE_NA;
 
+	/* Presence of phylink_mac_link_state or phylink_mac_an_restart is
+	 * an indicator of a legacy phylink driver.
+	 */
+	if (ds->ops->phylink_mac_link_state ||
+	    ds->ops->phylink_mac_an_restart)
+		dp->pl_config.legacy_pre_march2020 = true;
+
 	if (ds->ops->phylink_get_interfaces)
 		ds->ops->phylink_get_interfaces(ds, dp->index,
 					dp->pl_config.supported_interfaces);
-- 
2.30.2