net: dsa: fix unintended change of bridge interface STP state

BugLink: https://bugs.launchpad.net/bugs/1863019
[ Upstream commit 9c2054a5cf415a9dc32c91ffde78399955deb571 ]

When a DSA port is added to a bridge and brought up, the resulting STP
state programmed into the hardware depends on the order that these
operations are performed.  However, the Linux bridge code believes that
the port is in disabled mode.

If the DSA port is first added to a bridge and then brought up, it will
be in blocking mode.  If it is brought up and then added to the bridge,
it will be in disabled mode.

This difference is caused by DSA always setting the STP mode in
dsa_port_enable() whether or not this port is part of a bridge.  Since
bridge always sets the STP state when the port is added, brought up or
taken down, it is unnecessary for us to manipulate the STP state.

Apparently, this code was copied from Rocker, and the very next day a
similar fix for Rocker was merged but was not propagated to DSA.  See
e47172ab7e41 ("rocker: put port in FORWADING state after leaving bridge")

Fixes: b73adef67765 ("net: dsa: integrate with SWITCHDEV for HW bridging")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/net/dsa/port.c b/net/dsa/port.c
index bb4be26799048e6ae2b0659fb7df98ceb926ff8a..427d0d1195f8d9f5018f13d3e38bd66c477af5d0 100644 (file)
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -69,7 +69,6 @@ static void dsa_port_set_state_now(struct dsa_port *dp, u8 state)
 
 int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy)
 {
-       u8 stp_state = dp->bridge_dev ? BR_STATE_BLOCKING : BR_STATE_FORWARDING;
        struct dsa_switch *ds = dp->ds;
        int port = dp->index;
        int err;
@@ -80,7 +79,8 @@ int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy)
                        return err;
        }
 
-       dsa_port_set_state_now(dp, stp_state);
+       if (!dp->bridge_dev)
+               dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
 
        return 0;
 }
@@ -90,7 +90,8 @@ void dsa_port_disable(struct dsa_port *dp, struct phy_device *phy)
        struct dsa_switch *ds = dp->ds;
        int port = dp->index;
 
-       dsa_port_set_state_now(dp, BR_STATE_DISABLED);
+       if (!dp->bridge_dev)
+               dsa_port_set_state_now(dp, BR_STATE_DISABLED);
 
        if (ds->ops->port_disable)
                ds->ops->port_disable(ds, port, phy);