netdev - [PATCH net-next] net: dsa: return -EOPNOTSUPP when driver does not implement .port_lag

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Date:   Tue, 29 Jun 2021 23:32:15 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>
Subject: [PATCH net-next] net: dsa: return -EOPNOTSUPP when driver does not implement .port_lag_join

The DSA core has a layered structure, and even though we end up
returning 0 (success) to user space when setting a bonding/team upper
that can't be offloaded, some parts of the framework actually need to
know that we couldn't offload that.

For example, if dsa_switch_lag_join returns 0 as it currently does,
dsa_port_lag_join has no way to tell a successful offload from a
software fallback, and it will call dsa_port_bridge_join afterwards.
Then we'll think we're offloading the bridge master of the LAG, when in
fact we're not even offloading the LAG. In turn, this will make us set
skb->offload_fwd_mark = true, which is incorrect and the bridge doesn't
like it.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 net/dsa/switch.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/dsa/switch.c b/net/dsa/switch.c
index af71b8638098..248455145982 100644
--- a/net/dsa/switch.c
+++ b/net/dsa/switch.c
@@ -427,7 +427,7 @@ static int dsa_switch_lag_join(struct dsa_switch *ds,
 						   info->port, info->lag,
 						   info->info);

-	return 0;
+	return -EOPNOTSUPP;
 }

 static int dsa_switch_lag_leave(struct dsa_switch *ds,
@@ -440,7 +440,7 @@ static int dsa_switch_lag_leave(struct dsa_switch *ds,
 		return ds->ops->crosschip_lag_leave(ds, info->sw_index,
 						    info->port, info->lag);

-	return 0;
+	return -EOPNOTSUPP;
 }

 static int dsa_switch_mdb_add(struct dsa_switch *ds,
-- 
2.25.1