linux-kernel - [PATCH net v1] net: dsa: lantiq_gswip: fix and improve the unsupported interface error

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Date:   Sun,  7 Jun 2020 15:02:58 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     hauke@...ke-m.de, netdev@...r.kernel.org
Cc:     andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        davem@...emloft.net, linux-kernel@...r.kernel.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH net v1] net: dsa: lantiq_gswip: fix and improve the unsupported interface error

While trying to use the lantiq_gswip driver on one of my boards I made
a mistake when specifying the phy-mode (because the out-of-tree driver
wants phy-mode "gmii" or "mii" for the internal PHYs). In this case the
following error is printed multiple times:
  Unsupported interface: 3

While it gives at least a hint at what may be wrong it is not very user
friendly. Print the human readable phy-mode and also which port is
configured incorrectly (this hardware supports ports 0..6) to improve
the cases where someone made a mistake.

Fixes: 14fceff4771e51 ("net: dsa: Add Lantiq / Intel DSA driver for vrx200")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
---
 drivers/net/dsa/lantiq_gswip.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
index cf6fa8fede33..521ebc072903 100644
--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -1452,7 +1452,8 @@ static void gswip_phylink_validate(struct dsa_switch *ds, int port,
 
 unsupported:
 	bitmap_zero(supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
-	dev_err(ds->dev, "Unsupported interface: %d\n", state->interface);
+	dev_err(ds->dev, "Unsupported interface '%s' for port %d\n",
+		phy_modes(state->interface), port);
 	return;
 }
 
-- 
2.27.0