netdev - [RFC PATCH net-next 1/7] net: dsa: only bring down user ports assigned to a given DSA master

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Date:   Thu,  9 Dec 2021 00:32:24 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ansuel Smith <ansuelsmth@...il.com>
Subject: [RFC PATCH net-next 1/7] net: dsa: only bring down user ports assigned to a given DSA master

This is an adaptation of commit c0a8a9c27493 ("net: dsa: automatically
bring user ports down when master goes down") for multiple DSA masters.
When a DSA master goes down, only the user ports under its control
should go down too, the others can still send/receive traffic.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 net/dsa/slave.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 2b153b366118..f76c96e27868 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -2364,6 +2364,9 @@ static int dsa_slave_netdevice_event(struct notifier_block *nb,
 			if (!dsa_port_is_user(dp))
 				continue;
 
+			if (dp->cpu_dp != cpu_dp)
+				continue;
+
 			list_add(&dp->slave->close_list, &close_list);
 		}
 
-- 
2.25.1