netdev - [PATCH v2 net-next 2/2] net: dsa: mv88e6xxx: Only allow LAG offload on supported hardware

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Date:   Fri, 15 Jan 2021 13:52:59 +0100
From:   Tobias Waldekranz <tobias@...dekranz.com>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        olteanv@...il.com, netdev@...r.kernel.org
Subject: [PATCH v2 net-next 2/2] net: dsa: mv88e6xxx: Only allow LAG offload on supported hardware

There are chips that do have Global 2 registers, and therefore trunk
mapping/mask tables are not available. Refuse the offload as early as
possible on those devices.

Fixes: 57e661aae6a8 ("net: dsa: mv88e6xxx: Link aggregation support")
Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>
---
 drivers/net/dsa/mv88e6xxx/chip.c | 6 +++++-
 drivers/net/dsa/mv88e6xxx/chip.h | 5 +++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index dcb1726b68cc..91286d7b12c7 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -5385,9 +5385,13 @@ static bool mv88e6xxx_lag_can_offload(struct dsa_switch *ds,
 				      struct net_device *lag,
 				      struct netdev_lag_upper_info *info)
 {
+	struct mv88e6xxx_chip *chip = ds->priv;
 	struct dsa_port *dp;
 	int id, members = 0;
 
+	if (!mv88e6xxx_has_lag(chip))
+		return false;
+
 	id = dsa_lag_id(ds->dst, lag);
 	if (id < 0 || id >= ds->num_lag_ids)
 		return false;
@@ -5727,7 +5731,7 @@ static int mv88e6xxx_register_switch(struct mv88e6xxx_chip *chip)
 	 * 5-bit port mode, which we do not support. 640k^W16 ought to
 	 * be enough for anyone.
 	 */
-	ds->num_lag_ids = 16;
+	ds->num_lag_ids = mv88e6xxx_has_lag(chip) ? 16 : 0;
 
 	dev_set_drvdata(dev, ds);
 
diff --git a/drivers/net/dsa/mv88e6xxx/chip.h b/drivers/net/dsa/mv88e6xxx/chip.h
index 3543055bcb51..788b3f585ef3 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.h
+++ b/drivers/net/dsa/mv88e6xxx/chip.h
@@ -662,6 +662,11 @@ static inline bool mv88e6xxx_has_pvt(struct mv88e6xxx_chip *chip)
 	return chip->info->pvt;
 }
 
+static inline bool mv88e6xxx_has_lag(struct mv88e6xxx_chip *chip)
+{
+	return !!chip->info->global2_addr;
+}
+
 static inline unsigned int mv88e6xxx_num_databases(struct mv88e6xxx_chip *chip)
 {
 	return chip->info->num_databases;
-- 
2.17.1