netdev - [PATCH RFC net-next 05/13] net: phylink: update PCS when changing interface during resolution

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Message-Id: <E1jqHFo-0006Ot-Ac@rmk-PC.armlinux.org.uk>
Date:   Tue, 30 Jun 2020 15:28:56 +0100
From:   Russell King <rmk+kernel@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Ioana Ciornei <ioana.ciornei@....com>
Cc:     Vladimir Oltean <vladimir.oltean@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandru Marginean <alexandru.marginean@....com>,
        "michael@...le.cc" <michael@...le.cc>,
        "olteanv@...il.com" <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Subject: [PATCH RFC net-next 05/13] net: phylink: update PCS when changing
 interface during resolution

The only PHYs that are used with phylink which change their interface
are the BCM84881 and MV88X3310 family, both of which only change their
interface modes on link-up events.  This will break when drivers are
converted to split-PCS.  Fix this.

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
---
 drivers/net/phy/phylink.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 1507ea8a9385..f1693ec63366 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -629,8 +629,15 @@ static void phylink_resolve(struct work_struct *w)
 				phylink_link_down(pl);
 				cur_link_state = false;
 			}
+			phylink_pcs_config(pl, false, &link_state);
+			pl->link_config.interface = link_state.interface;
+		} else {
+			/* The interface remains unchanged, only the speed,
+			 * duplex or pause settings have changed. Call the
+			 * old mac_config() method to configure the MAC/PCS.
+			 */
+			phylink_mac_config(pl, &link_state);
 		}
-		phylink_mac_config(pl, &link_state);
 	}
 
 	if (link_state.link != cur_link_state) {
-- 
2.20.1